Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-17T11:31:11Z No. of bitstreams: 2 edilson_almeida.pdf: 627105 bytes, checksum: a0b76b2072690c3740d1f97384c5ba3b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-17T11:31:45Z (GMT) No. of bitstreams: 2 edilson_almeida.pdf: 627105 bytes, checksum: a0b76b2072690c3740d1f97384c5ba3b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-11-17T11:31:45Z (GMT). No. of bitstreams: 2 edilson_almeida.pdf: 627105 bytes, checksum: a0b76b2072690c3740d1f97384c5ba3b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2012 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Objetivou-se com este estudo avaliar o uso de aditivos digestivos (enzimas) e equilibradores da microbiota intestinal (?cidos org?nicos, extratos vegetais, probi?ticos e simbi?ticos) sob os par?metros de desempenho (ganho em peso, consumo de ra??o, convers?o alimentar, viabilidade e ?ndice de efici?ncia europeu), rendimento de carca?a e cortes, qualidade da carne e empenamento de frangos de corte criados com o uso de cama de avi?rio reutilizada. Foram utilizadas 552 aves sexadas, da linhagem Hubbard, com um dia de idade, distribu?das segundo um delineamento inteiramente casualisado com seis tratamentos (controle negativo: dieta controle (DC) sem aditivos; DC + extrato vegetal (alho + or?gano); DC + complexo enzim?tico (protease, amilase e celulase); DC + probi?tico; DC + simbi?tico e DC + ?cidos org?nicos (ac?tico, f?rmico e propi?nico), com quatro repeti??es (duas de macho e duas de f?meas) de 23 aves cada. Os par?metros de desempenho das aves foram avaliados de 1 a 7, 1 a 21, 1 a 35 e 1 a 42 dias de idade. Aos 42 dias, foram abatidas 3 aves de cada parcela experimental para avalia??o do rendimento de carca?a e cortes e dos par?metros de qualidade da carne do peito (capacidade de reten??o de ?gua, valor de pH, perda de peso por cozimento, maciez objetiva e colora??o). O empenamento das aves foi avaliado aos 28 e 35 dias de idade. Houve diferen?as das dietas sobre o ganho em peso das aves de 1 a 21 e de 1 a 35 dias, e as aves suplementadas com a dieta de extrato vegetal apresentaram maior ganho em peso que as aves suplementadas com as dietas de probi?tico e simbi?tico. Durante o per?odo total de cria??o, n?o houve efeito das dietas sobre o rendimento de carca?a e cortes, na qualidade da carne e no empenamento das aves. O sexo afetou o desempenho, rendimento de peito e carne do peito e o empenamento das aves, e os machos apresentaram melhores resultados de desempenho. A viabilidade foi melhor para as f?meas, que tamb?m apresentaram maiores rendimentos de peito e carne do peito e melhor empenamento. Os dados verificados permitem concluir que o uso dos aditivos digestivos e equilibradores da microbiota intestinal n?o afetam o desempenho, o rendimento de carca?a e cortes, a qualidade da carne e o empenamento. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT The objective of this study to evaluate the use of digestive additives (enzymes) and balancing the intestinal microbiota (organic acids, plant extracts, probiotics and symbiotics) on performance parameters (weight gain, feed intake, feed conversion, viabibility and european efficiency index), carcass yield and cuts, meat quality and feathering of broilers, created with the use of reused litter. Five hundred fifty-two sexed birds were used, strain Hubbard, with one day of age, distributed according to a completely randomized design with six treatments (negative control: control diet (CD) without additives; CD + plant extract (garlic + oregano); CD + complex enzyme (protease, amylase and cellulase); CD + probiotic; CD + symbiotic and CD + organic acids (acetic, formic and propionic acids) with four replications (two male and two females) of 23 birds each. Performance parameters were evaluated 1-7, 1-21, 1-35 and 1-42 day-old birds. At 42 days, three birds were slaughtered each plot for evaluation of carcass yield and cuts and parameters of meat quality of breast (water retention capacity, Ph value, cooking weight loss, objective tenderness and coloring). The feathering of the birds was evaluated at 28 and 35 days old. There were differences of diets on weight gain of broilers 1-21 and 1 to 35 days, and broilers supplemented diet with extract plant showed higher weight gain than broilers supplemented diets with probiotic and symbiotic. During the whole period of creation, there was no effect of diets on carcass yield and cuts, meat quality and feather covering. The sex affected performance, breast meat yield and breast meat and feather covering, and the males showed better performance results. The viability, which was better for females, which also showed higher values of breast and breast meat and better bending. Data verified the conclusion that the use of additives and digestive balancing the intestinal microbiota does not affect performance, yield carcass and cuts, meat quality and warping.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T12:22:40Z No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T12:23:00Z (GMT) No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-11-18T12:23:00Z (GMT). No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2010 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este trabalho objetivou avaliar o efeito de diferentes aditivos alternativos (alho, saponina, probi?ticos, prebi?ticos, ?cidos org?nicos e complexos enzim?ticos), em substitui??o aos antibi?ticos, sobre os par?metros de desempenho, rendimento de carca?a e cortes, custo de produ??o, empenamento e qualidade da carne de frangos de corte. Foram utilizados 744 pintainhos, sexados, com um dia de idade, da linhagem Cobb 500. As aves foram distribu?das segundo um delineamento inteiramente casualizado com seis tratamentos (T1: ra??o basal (RB) + vacina de coccidiose (VC); T2: RB + antibi?tico + anticoccidiano; T3: RB + ?cidos org?nicos + VC; T4: RB + simbi?tico + VC; T5: RB + complexo enzim?tico + VC eT6: RB + extratos vegetais + VC) com quatro repeti??es de 31 aves. Os tratamentos influenciaram os par?metros de desempenho aos 7, 21 e 35 dias de idade das aves, mas n?o afetaram o desempenho quando considerado o per?odo total de cria??o. O uso de aditivos alternativos aumentou o custo de produ??o, sendo que as dietas contendo simbi?ticos, complexo enzim?tico e extratos vegetais apresentaram maior custo. O empenamento n?o foi afetado pelos tratamentos. O rendimento de carca?a e cortes e as caracter?sticas de qualidade da carne n?o foram afetados pelos tratamentos avaliados. Com base nos resultados verificados, pode-se concluir que a substitui??o dos antibi?ticos por aditivos alternativos na alimenta??o de frangos de corte, n?o afeta o desempenho final das aves abatidas com 42 dias e n?o alteram o rendimento de carca?a e cortes e a qualidade da carne das aves, mas onera os custos em at? 15%, quando se utiliza aditivos nas dietas. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010. / ABSTRACT The antibiotics used in animal food to promote growth have been gradually banished due to the possible risk of cross-resistance to drugs used to human therapy. As a result, the search for food without these products is increasing. This study aimed to evaluate the effect of different alternative additives (garlic, saponine, probiotics, prebiotics, and enzymatic complex and organic acids) to substitute antibiotics on parameters of performance, carcass and cuts yield, production cost, feathering and quality of broilers? meat. A total of 744 one day old sexed broilers chicks Cobb 500 line were distributed in 6 treatments (T1: basal diet (BD) + coccidiosis vaccine (CV); T2: BD + antibiotic + anticoccidian; T3: BD + organic acid + CV; T4: BD + symbiotic + CV; T5: BD + enzymatic complex + CV; T6: BD + vegetal extract + CV) under a completely randomized design, with 4 replicates and 31 chicks per experimental unit.Treatments influenced performance at 7, 21 and 35 days old, but they did not affect it when considered the total breeding period. Additives use increased production cost, and diets with symbiotics, enzymatic complex and vegetal extract showed higher cost. Feathering, carcass and cuts yield and meat quality characteristics were not affected by the treatments. Results conclude that substituting antibiotics to additives on broilers food cause performance reduction on feeding initial phase, but it did not affect the final performance, nor carcass and cuts yield or meat quality of chicken slaughtered at 42 days old, but it burdens costs up to 15% when additives are used in diets.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-12-22T16:00:42Z No. of bitstreams: 2 helio_beirigo_carvalho.pdf: 726064 bytes, checksum: 56c4f507b6b622e8be789dca02e2dfd2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-12-22T16:52:44Z (GMT) No. of bitstreams: 2 helio_beirigo_carvalho.pdf: 726064 bytes, checksum: 56c4f507b6b622e8be789dca02e2dfd2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2015-12-22T16:52:44Z (GMT). No. of bitstreams: 2 helio_beirigo_carvalho.pdf: 726064 bytes, checksum: 56c4f507b6b622e8be789dca02e2dfd2 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2012 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este trabalho foi realizado para avaliar o efeito da formula??o de dietas que consideram o atendimento das exig?ncias de prote?na bruta, dietas com redu??o dos valores de prote?na bruta e atendimento das exig?ncias de amino?cidos digest?veis e dietas com atendimento das exig?ncias de amino?cidos sobre os par?metros de desempenho, consumo de energia, prote?na, amino?cidos, rendimento de carca?a e cortes, empenamento e custos na produ??o de frangos de corte nas diferentes fases de cria??o. Foram realizados cinco experimentos, conduzidos no setor de Avicultura da UFVJM, no Campus JK, em Diamantina ? MG. As aves usadas nos experimentos foram todas machos, da linhagem Cobb 500. No total, foram usadas 2.430 aves e consideradas as fases de 1 a 7, 8 a 21, 22 a 35, 36 a 42 e 42 a 49 dias de idade. Em todos os experimentos, as aves foram distribu?das segundo um delineamento experimental inteiramente casualizado, com seis tratamentos (T1 ? Dieta-controle formulada de acordo com recomenda??es das Tabelas Brasileiras para aves e su?nos (2011) para atender prote?na bruta e amino?cidos digest?veis; T2 ? Dieta com 5% de redu??o da prote?na bruta da dieta-controle; T3 - Dieta com 10% de redu??o da prote?na bruta da dieta-controle; T4 - Dieta com 15% de redu??o da prote?na bruta da dieta-controle; T5 - Dieta formulada para atender as exig?ncias de amino?cidos digest?veis da dieta-controle com o valor da prote?na bruta livre; T6 - Dieta formulada para atender o valor da prote?na bruta da dieta-controle deixando livre o atendimento dos amino?cidos digest?veis. Na fase de 42 a 49 dias foram utilizadas tr?s repeti??es, mas nas demais fases foram usadas quatro repeti??es por tratamento. Com rela??o ao desempenho das aves, foi observado que, com o atendimento das exig?ncias de amino?cidos digest?veis, ? poss?vel reduzir em at? 10% os valores da prote?na bruta nas recomenda??es nutricionais feitas por Rostagno et al. (2011) e, dessa forma, o desempenho das aves n?o ? afetado. No entanto, dietas formuladas para atender apenas as exig?ncias de amino?cidos digest?veis, pioram o desempenho das aves. De modo geral, n?o houve diferen?as no consumo de energia; por?m, o consumo de prote?na e de amino?cidos diferiu ? medida em que se alterou os n?veis de prote?na bruta e amino?cidos digest?veis das dietas. A redu??o dos valores de prote?na bruta das dietas em at? 15% n?o afetou o rendimento de carca?a e cortes, mas as dietas formuladas para atender apenas ?s exig?ncias de amino?cidos digest?veis causaram pioras no rendimento de carca?a e carne do peito das aves. O empenamento das aves n?o foi afetado pelas dietas avaliadas. As an?lises de custos realizadas mostraram que dietas formuladas para o atendimento da prote?na bruta apresentam menor custo; por?m, at? os 35 dias, a redu??o de at? 10% dos valores da prote?na bruta com suplementa??o de amino?cidos digest?veis melhoram o custo do ganho em peso das aves. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT This study was conducted to evaluate the effect of diet formulation considering the attendance of crude protein, diets with reduced crude protein values and requirements of digestible amino acids and diets to meet the amino acid requirements on parameters performance, energy consumption, protein, amino acids, carcass yield and cuts, feathering and costs in the production of broiler chickens at various stages of creation. We conducted five experiments, conducted in the experimental aviary of UFVJM on campus in JK Diamantina - MG. The birds used in the experiments were all male, the strain Cobb 500. In total 2430 birds were used and considered stages 1-7, 8-21, 22-35, 36-42 and 42-49 days of age. In all experiments, the birds were distributed according to a completely randomized design with six treatments (T1 - diet control and formulated in accordance with recommendations of Rostagno et al. (2011) to meet crude protein and digestible amino acids, T2 - diet 5% reduction in crude protein diet control, T3 - diet with 10% reduction of crude protein in the control diet; T4 - diet with 15% reduction of crude protein in the control diet; T5 - diet formulated to meet the requirements the digestible amino acids of diet control with the amount of crude protein free; T6 - diet formulated to meet the amount of crude protein diet control with the amount of digestible amino acids free). In the period from 42 to 49 days were three replicates, but in the other phases were used four replicates per treatment. The performance of the birds, it was observed that, with the assistance of digestible amino acid requirements can be reduced up to 10% of the crude protein nutritional recommendations made by Rostagno et al. (2011), that performance is not affected. However, diets formulated to meet only the requirements of digestible amino acids, decrease the performance of the birds. In general, no differences in energy consumption, however, the consumption of protein and amino acids differ as altered levels of crude protein and digestible amino acid diets. The decreased levels of dietary crude protein up to 15% did not affect carcass yield and cuts, but the diet formulated to meet only the requirements of digestible amino acids, caused decrease in carcass and breast meat of birds. The feathering of the birds was not affected by the diets evaluated. The cost analysis performed showed that diets formulated to meet crude protein have a lower cost, however, up to 35 days, a reduction of up to 10% of the crude protein supplementation with digestible amino acids, improve the cost of weight gain birds.

Submitted by M?rden L?les (marden.inacio@ufvjm.edu.br) on 2016-07-22T18:15:31Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dayane_Josiane_Vieira.pdf: 476245 bytes, checksum: 1c7586583cc65ebc0c54eb11a8f56b98 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-07-25T17:33:56Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dayane_Josiane_Vieira.pdf: 476245 bytes, checksum: 1c7586583cc65ebc0c54eb11a8f56b98 (MD5) / Made available in DSpace on 2016-07-25T17:33:56Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dayane_Josiane_Vieira.pdf: 476245 bytes, checksum: 1c7586583cc65ebc0c54eb11a8f56b98 (MD5) Previous issue date: 2015 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Funda??o de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) / Dois experimentos foram conduzidos com o objetivo de avaliar nutricionalmente o farelo de crambe em ra??es para frangos de corte. O primeiro experimento foi realizado para avaliar o coeficiente de digestibilidade aparente (CDA) da mat?ria seca (MS), da prote?na bruta (PB), da mat?ria mineral (MM), o coeficiente de metaboliza??o aparente da energia bruta (CMAEB), a energia metaboliz?vel aparente (EMA) e a energia metaboliz?vel aparente corrigida para o balan?o de nitrog?nio (EMAn) do farelo de crambe para frangos de corte, empregando-se o m?todo de coleta total de excretas. Para o primeiro experimento foram utilizados 140 pintos de corte da linhagem Cobb 500 em crescimento de 14 a 24 dias de idade, alimentados com duas ra??es, sendo T1= refer?ncia (RR) e T2= uma ra??o teste (RT), que consiste em 80% (RR) + 20% (inclus?o do farelo de crambe), com sete repeti??es e 10 aves por unidade experimental. No segundo experimento foi avaliado o desempenho dos frangos nas fases inicial (8 a 21 dias) e final (22 a 42 dias), o rendimento de carca?a e cortes e a an?lise econ?mica da substitui??o de parte da prote?na bruta total da ra??o pela prote?na bruta do farelo de crambe. As aves foram distribu?das em delineamento inteiramente ao acaso, com cinco tratamentos, seis repeti??es de 21 aves por unidade experimental. Os n?veis de substitui??o de parte da prote?na bruta total da ra??o pela prote?na bruta do farelo de crambe avaliados foram: 0, 3, 6, 9 e 12%. Avaliou-se o consumo de ra??o, o ganho de peso, a convers?o alimentar, peso e rendimento de carca?a e de cortes nobres (peito, coxa e sobrecoxa). O farelo de crambe apresentou 2262,03 kcal/kg de EMA e 2262,19 kcal/kg de EMAn. Os valores de coeficientes de digestibilidade foram: CDAMS 69,14%, CDAPB 60,38%, CDAMM 58,86% e o CMAEB foi de 53,51% na MS do alimento. Observou-se que a prote?na bruta do farelo de crambe pode substituir em at? 12% de parte da prote?na bruta total da ra??o, em ambas as fases, por n?o acarretar em baixo desempenho e rendimento de carca?a e de cortes. Pela an?lise econ?mica ? vi?vel a substitui??o de parte da prote?na da ra??o em at? 6% pela prote?na do farelo de crambe. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2015. / ABSTRACT Two experiments were conducted to nutritionally evaluate crambe meal in diets for broilers. The first experiment was conducted to evaluate the apparent digestibility coefficient (ADC) of dry matter (DM), crude protein (CP) and mineral matter (MM), the apparent metabolizing coefficient of crude energy (AMCCE), the apparent metabolizable energy (AME), and the apparent metabolizable energy corrected for nitrogen balance (cAME) of the crambe meal for broilers, using the total excreta collection method. For the first experiment, 140, Cobb 500 strain, growing broilers of 14 to 24 days of age were utilized, fed two rations: T1 = reference (RR) and T2 = a test ration (TR), consisting of 80% RR + 20% (inclusion of crambe meal) with seven replicates and 10 broilers per experimental unit. In the second experiment, performance of broilers during the initial phase (8 to 21 days of age) and final phase (22 to 42 days of age), carcass and cuts yields, and economic analysis of partial substitution of the total crude protein from the ration for crude protein from crambe meal were evaluated. Broilers were distributed in a completely randomized design, with five treatments and six replicates of 21 broilers per experimental unit. The evaluated levels of partial substitution of crude protein from ration for crude protein from crambe meal were 0, 3, 6, 9 and 12%. Feed intake, body weight gain, feed conversion, carcass and prime cuts (breast, thigh and drumstick) weights and yields were evaluated. Crambe meal showed 2262.03 kcal / kg of AME and 2262.19 kcal/kg of cAME. Values of digestibility coefficients were: DCDM 69.14%, DCCP 60.38%, DCMM 58.86% and AMCCE 53.51%, DM of feed. It was observed that the crude protein from crambe meal can partially substitute up to 12% of the total dietary crude protein, in both phases, for not resulting in impaired performance and carcass and cuts yield. Thru the economic analysis, it is feasible the partial substitution of crude protein from the ration up to 6% by the protein from crambe meal.

Submitted by Nivaldo Melo (nivaldo.melo@ufvjm.edu.br) on 2016-10-11T15:59:27Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) nykolas_carvalho_schiavon.pdf: 680531 bytes, checksum: 657731b79e9a7d7463b7f606d0966018 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-10-11T19:34:59Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) nykolas_carvalho_schiavon.pdf: 680531 bytes, checksum: 657731b79e9a7d7463b7f606d0966018 (MD5) / Made available in DSpace on 2016-10-11T19:34:59Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) nykolas_carvalho_schiavon.pdf: 680531 bytes, checksum: 657731b79e9a7d7463b7f606d0966018 (MD5) Previous issue date: 2015 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / A adi??o de ?cido c?trico ao substrato pode influenciar a disponibilidade de f?sforo para as plantas de caf? e possibilitar melhor crescimento e nutri??o. Al?m disso, o crescimento e a nutri??o possivelmente sofrer?o influencia da cultivar e do parcelamento de dose do ?cido c?trico. Por isso, objetivou-se avaliar o crescimento e ac?mulo de nutrientes por mudas de caf? (Coffea arabicaL.) de tr?s cultivares: Catua? Vermelho IAC 99, Mundo Novo IAC 379- 19 e Oeiras MG 6851, em substrato tratado com ?cido c?trico e diferentes doses de P2O5. Buscou-se tamb?m verificar o efeito do parcelamento do ?cido c?trico no crescimento e ac?mulo de nutrientes, pelas mudas. Foram instalados dois experimentos, delineados em cinco blocos e esquema fatorial. No primeiro, foram avaliadas as tr?s cultuvares de caf? e quatro doses de P2O5 (0, 450, 900 e 1.800 g m-3) em solo tratato com ?cido c?trico anidro (0,5 mg dm3). No segundo experimento, os fatores foram compostos pelas quatro doses de P2O5 e a dosagem de ?cido c?trico dividida em quatro parcelamentos. As plantas foram submetidas aos tratamentos a partir da emiss?o das primeiras folhas cotiledonares as avalia??es ocorreram ap?s 180 dias (no primeiro experimento) e ap?s 120 dias (no segundo experimento). Foram avaliadas vari?veis de crescimento, ac?mulo de mat?ria seca e nutrientes pelas plantas de caf?. Como resultados verificou-se que as doses de P2O5, em substrato tratado com ?cido c?trico, influenciaram o crescimento das mudas de caf? das cultivares estudadas. O maior crescimento, ac?mulo de biomassa e ac?mulo m?ximo de nutrientes foram na dose de 900 g m-3 de P2O5. Com rela??o ao parcelamento do ?cido c?trico, foi observado melhor crescimento de mudas de caf? quando a dosagem foi parcelada em tr?s e quatro vezes. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2015. / The addition of citric acid to the substrate can influence the availability of phosphorus for plants and coffee allow better growth and nutrition. Additionally, the growth and nutrition possibly suffer influence of genotype and citric acid dose installment. Therefore, this study aimed to evaluate the growth and accumulation of nutrients in coffee seedlings (Coffea arabicaL.) Of three cultivars Catua? Vermelho IAC 99, Mundo Novo IAC 379-19 and Oeiras MG 6851, in substrate treated with citric acid and different of P2O5. It also sought to determine the effect of citric acid installment in the growth and accumulation of nutrients by the plants. Two experiments, outlined in five blocks and a factorial design were installed. At first, they evaluated the three coffee cultuvares P2O5 four doses (0, 450, 900 and 1800 g m-3) tratato soil with anhydrous citric acid (0,5 mg dm-3). In the second experiment, the factors were composed by four doses of P2O5 and citric acid dosage divided into four installments. The plants were subjected to treatment from the issuance of the first cotyledon leaves the evaluations occurred after 180 days (the first experiment) and 120 days (the second experiment). Growth variables were evaluated, dry matter accumulation and nutrients by coffee plants. As a result it was found that doses of P2O5, substrate treated with citric acid, influenced the growth of coffee seedlings of cultivars. The greatest growth, biomass accumulation and maximum nutrient accumulation were at a dose of 900 g m-3 of P2O5. Regarding the installment of citric acid, better growth of coffee seedlings was observed when the dosage was split into three four times.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-05T17:51:14Z No. of bitstreams: 1 AlbinoOliveiraNunes_TESE.pdf: 3044706 bytes, checksum: bcd3de2785c53116032a8db14077d3d4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-08T21:26:44Z (GMT) No. of bitstreams: 1 AlbinoOliveiraNunes_TESE.pdf: 3044706 bytes, checksum: bcd3de2785c53116032a8db14077d3d4 (MD5) / Made available in DSpace on 2016-01-08T21:26:44Z (GMT). No. of bitstreams: 1 AlbinoOliveiraNunes_TESE.pdf: 3044706 bytes, checksum: bcd3de2785c53116032a8db14077d3d4 (MD5) Previous issue date: 2014-07-28 / A educa??o cient?fica tem passado por um per?odo de redefini??es, contesta??es e novas contribui??es oriundas da pesquisa em ensino de ci?ncias. Um dos aportes ? a ideia de um letramento cient?fico e tecnol?gico que n?o apenas permita ao cidad?o conhecer a ci?ncia, mas tamb?m compreender aspectos sobre a constru??o e motiva??es da pesquisa cient?fica e tecnol?gica. Em conson?ncia com esse pensamento, t?m-se os estudos no campo Ci?ncia-Tecnologia-Sociedade que, desde a d?cada de 70, vem contribuindo para o ensino e aprendizagem de ci?ncias nos moldes de uma compreens?o das interrela??es com a sociedade, nos pa?ses ocidentais do hemisf?rio norte. Aqui no Brasil, esse enfoque come?ou a ganhar proje??o a partir da d?cada de 90, quando ocorreram as publica??es das primeiras disserta??es sobre o tema. Atualmente, percebese claramente a influencia desse enfoque nas orienta??es curriculares nacionais para o ensino m?dio na ?rea de ci?ncias naturais e exatas (PCN, PCN+, OCN), e tamb?m nos livros adotados pelo Programa Nacional do Ensino M?dio. Parece, no entanto, haver uma lacuna, no tocante ? discuss?o dos componentes curriculares espec?ficos ofertados no ensino superior sob esse enfoque. Assim, neste trabalho prop?s-se a inser??o do enfoque CTS, mediante a elabora??o de material did?tico complementar, sobre os conceitos de ?cidos e bases estudados na disciplina Qu?mica Geral, voltado ?s licenciaturas de ci?ncias naturais. Para tanto, foi realizada uma pesquisa bibliogr?fica cujo objetivo era construir o estado da arte sobre esses conceitos na literatura espec?fica de ensino de ci?ncias, subdividido em duas etapas: estudo sistem?tico (com dezesseis peri?dicos escolhidos segundo o Qualis-Capes) e um estudo assistem?tico com busca direta em bases de dados e refer?ncias citadas nos artigos do estudo sistem?tico. Os trabalhos encontrados foram analisados segundo an?lise de conte?do nos quais as categorias escolhidas a priori foram o n?vel de ensino, os conceitos ?cido-base adotados e a estrat?gia/referencial te?rico de ensino adotado. Uma segunda etapa foi a identifica??o das atitudes e cren?as CTS (Ci?ncia-Tecnologia-Sociedade) e QSA (Qu?mica-Ambiente-Sociedade) de estudantes de cursos de forma??o de professores e tecnol?gicos em tr?s institui??es distintas: UTFPR, UFRN e IFRN. Nesse estudo foram utilizados dois question?rios, compostos respectivamente por uma escala de Likert, uma escala de diferencial sem?ntico e quest?es abertas. A confiabilidade dos dados quantitativos foi estimada pelo m?todo do alfa de Cronbach, e os dados tratados segundo a estat?stica cl?ssica, usando como medidas de centralidade a m?dia e, de dispers?o, o desvio m?dio. Os dados qualitativos foram abordados segundo a an?lise de conte?do, com categorias que emergiram da leitura das respostas. Na terceira etapa foi analisada a presen?a de conte?do CTS e QSA nos cap?tulos que abordavam os conceitos de ?cidos e bases em nove livros de Qu?mica Geral, frequentemente usados nos cursos superiores de institui??es p?blicas do Rio Grande do Norte. Os resultados mostram que h? pouca presen?a de propostas com enfoque CTS e QSA para o ensino sobre ?cidos e bases, e estando essas voltadas ao ensino m?dio ou para as disciplinas de Instrumenta??o para o Ensino, n?o sendo encontrada nenhuma proposta para a disciplina de Qu?mica Geral. As atitudes e cren?as dos estudantes indicam a presen?a de uma vis?o positivista, apoiada nos mitos da neutralidade de C&T e na perspectiva salvacionista de sua interven??o. A an?lise dos livros revelou que quase n?o se encontram conte?dos CTS e QSA nos cap?tulos analisados e, quando encontrados, eles est?o apresentados de maneira desconexa com o corpo de texto principal. Por fim, como x proposta para contribuir com a solu??o do problema de aus?ncia de propostas CTS nos livros de Qu?mica Geral, assim como as atitudes positivistas dos estudantes, foi desenvolvido um material did?tico a ser usado na disciplina de Qu?mica Geral no Ensino Superior. O material est? estruturado para trazer uma vis?o hist?rica da elabora??o dos conceitos, apresentar o uso dos materiais, dos processos industriais e tecnol?gicos e as consequ?ncias socioambientais dessas atividades / Scientific education has been passing by redefinitions, contestations and new contributions from the research on science teaching. One contribution is the idea of science and technology literacy, allowing the citizens not only knowing science but also understand aspects on the construction and motivation of scientific and technological research. In accordance with this idea, there is the Science-Technology-Society (STS) studies which, since the 1970s, has been contributing for science teaching and learning according to the comprehension of the relationships with society in the Western countries of the North. In Brazil, this approach began to gain projection from the 1990s when the first essays on the theme were published. Currently, there is a clear influence of this approach on the national curriculum guidelines, especially for the area of Natural Sciences, and also on the textbooks chosen by the High School National Program (Programa Nacional do Ensino M?dio). However, there seems to be a gap in relation to the discussion on the specific curricular component seen in college on this approach. Thus, this study aims at adopting the approach STS, face to the preparation of complimentary educational material on acid and bases concepts studied in the course of General Chemistry of the Natural Sciences graduation program. To this end, it was performed a bibliographical research aiming at making the state-of-the-art in in these concepts in specific literature to science teaching. It is divided in two stages: systematic study (with sixteen journals chosen according to Qualis-Capes and an unsystematic study with direct search in databases and references in the papers of the systematic study. The studies had their content analyzed and the categories chosen a priori were the level of education, the acid-base theory adopted, and the strategy/theoretical frame of reference adopted. A second stage aimed at identifying attitudes and beliefs on STS (Science-Technology-Society) and CSE (Chemistry-Society-Environment) of students in the teacher and technologist training course in three diferent institutions: UTFPR, UFRN and IFRN. In this study, it was used two questionnaires, composed of a Likert scale, semantic differential scale and open questions. The quantitative data reliability was estimated through Cronbach?s alpha method, and tha data were treated according to classic statistics, using the mean as the centrality measures, and the mean deviation as dispersion. The qualitative data were treated according to the content analysis with categories taken from the reading of answers. In the third stage, it was analyzed the presence of STS and CSE content in chapters on acid and bases concepts of nine General Chemistry textbooks, frequently used in graduation programs in public institutions of the state of Rio Grande do Norte. The results showed that there are few proposals of acid and bases teaching, and they are generally aimed at High School or at instrumentation for teaching courses, and no course for General Chemistry. The student?s attitudes and beliefs show the presence of a positivist point of view based on the concept of Science and Technology neutrality and the salvation of its mediation. The books analysis showed just a few content on STS and CSE are found in the studied chapters, and they are generally presented disjointedly in relation to the rest of the main text. In the end, as suggestion to solve the absence of proposals STS in General Chemistry books, as well as the student?s positivist attitudes, it was developed some educational material to be used in the course of General Chemistry at College. The material is structured to introduce a historical view of the concepts preparation, present the use of materials, the industrial and technological processes, and social and environmental consequences of this activities

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-01-14T18:51:53Z No. of bitstreams: 1 SergioRuschiBergamachiSilva_DISSERT.pdf: 4405606 bytes, checksum: 784604c435bd6eb5424d9dbf6448597d (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-01-15T19:10:11Z (GMT) No. of bitstreams: 1 SergioRuschiBergamachiSilva_DISSERT.pdf: 4405606 bytes, checksum: 784604c435bd6eb5424d9dbf6448597d (MD5) / Made available in DSpace on 2016-01-15T19:10:11Z (GMT). No. of bitstreams: 1 SergioRuschiBergamachiSilva_DISSERT.pdf: 4405606 bytes, checksum: 784604c435bd6eb5424d9dbf6448597d (MD5) Previous issue date: 2014-08-08 / No presente trabalho objetivou-se inicialmente, o estudo te?rico da estabilidade de intermedi?rios tetra?dricos formados a partir de rea??es de adi??o ? carbonila utilizando a teoria perturbativa M?ller-Plesset de segunda (MP2) e terceira ordem (MP3). Correla??es lineares entre a diferen?a de energia eletr?nica de rea??es com ?ndices de Wiberg e comprimentos de liga??es C-O foram obtidas, tendo sido observado que a estabilidade dos adutos formados depende diretamente da densidade eletr?nica envolvida entre esses ?tomos. O entendimento dos par?metros eletr?nicos dessas estruturas possui grande import?ncia devido ao grande uso de rea??es qu?micas que em seu curso formam este tipo intermedi?rio tetra?drico. Empregando a metodologia ONIOM (B3LYP:AMBER), avaliou-se a estereosseletividade de uma rea??o enzim?tica entre a enzima CAL B com um ?ster de cadeia longa. Neste estudo, foram obtidas as energias eletr?nicas do estado inicial e do intermedi?rio da etapa lenta da rea??o da transesterifica??o a partir das duas poss?veis faces proquirais Re e Si. O objetivo foi estudar a enantiosseletividade da CAL B e racionaliz?-la a partir da teoria qu?ntica de ?tomos em mol?culas (QTAIM). Um estudo te?rico utilizando compostos inorg?nicos foi realizado com o m?todo ab initio CBS-QB3 objetivando encontrar uma rela??o entre termodin?mica e equil?brio envolvendo ?cidos e bases. Os resultados observados mostraram uma excelente rela??o entre a varia??o da energia livre de Gibbs, ?G, de dissocia??o de ?cidos com o ?G da rea??o de hidr?lise da base conjugada correspondente. Observou-se, ainda, uma rela??o entre o ?G da rea??o de hidr?lise de ?cidos conjugados e seus correspondentes raios at?micos mostrando que a estabilidade desempenha um papel importante nas rea??es de hidr?lise. A import?ncia da solvata??o no comportamento ?cido/base quando comparado a ?Gs te?ricos e experimentais, tamb?m foi avaliada. / The present work aimed first, the theoretical study of tetrahedral intermediate stability formed from carbonyl addition reactions using the second (MP2) and third (MP3) order M?ller?Plesset perturbation theory. Linear correlations between electronic energy difference of reactions with Wiberg Indexes and C-O bond lengths were obtained, and was observed that the stability of adducts formed depends directly of electronic density involved between these atoms. The knowing of electronic parameters of these structures has an important hole due to the large use on reactions that in his course forms this tetrahedral intermediate. Employing the ONIOM (B3LYP:AMBER) methodology, was evaluated the stereoselectivity of a enzymatic reaction between CAL B enzyme and a long chain ester. In this study, were obtained the electronic energies of ground state and intermediate state of transesterification rate-determing step from two possible proquirals faces Re and Si. The objective was study the enantioselectivity of CAL B and rationalizes it using quantum theory of atoms in molecules (QTAIM). A theoretical study employing inorganic compounds was performed using ab initio CBS-QB3 method aiming to find a link between thermodynamic and equilibrium involving acids and bases. The results observed showed an excellent relationship between difference in Gibbs free energy, ?G of acid dissociation reaction and ?G of hydrolysis reaction of the corresponding conjugate base. It was also observed, a relationship between ?G of hydrolysis reaction of conjugate acids and their corresponding atomic radius showing that stability plays an important role in hydrolysis reactions. The importance of solvation in acid/base behavior when compared to theoretical and experimental ?G?s also was evaluated.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-14T19:53:37Z No. of bitstreams: 1 AnaKarinaPereiraLeite_DISSERT.pdf: 3134726 bytes, checksum: 98310bd9f7d887f28ee1f7167205ada0 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-15T22:28:23Z (GMT) No. of bitstreams: 1 AnaKarinaPereiraLeite_DISSERT.pdf: 3134726 bytes, checksum: 98310bd9f7d887f28ee1f7167205ada0 (MD5) / Made available in DSpace on 2016-06-15T22:28:23Z (GMT). No. of bitstreams: 1 AnaKarinaPereiraLeite_DISSERT.pdf: 3134726 bytes, checksum: 98310bd9f7d887f28ee1f7167205ada0 (MD5) Previous issue date: 2014-01-24 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / As redes metalorg?nicas (MOFs) s?o h?bridos, normalmente cristalinos, constitu?dos de subunidades inorg?nicas, metais ou clusters met?licos, conectados por ligantes org?nicos polit?picos de forma repetitiva originando estruturas em duas ou tr?s dimens?es, geralmente porosas. Neste trabalho foram sintetizadas MOFs com ?ons lantan?deos (La3+ e Gd3+) e ligantes tipo dicarboxilatos (?cidos isoft?lico e o tereft?lico) pelos m?todos hidrot?rmico, solvot?rmico e hidro(solvo)t?rmico. Os efeitos da rota sint?tica sobre a estrutura e propriedades das MOFs foram estudados, bem como do tipo de aquecimento, convencional ou por microondas. As amostras obtidas na forma de p?s foram caracterizadas por difra??o de raios-X, espectroscopia de infravermelho, analises t?rmicas e microscopia eletr?nica de varredura. Os resultados sugerem a necessidade de uma base, org?nica ou inorg?nica, para promover a desprotona??o do ligante, uma vez que nas amostras preparadas pelo m?todo hidrot?rmico, sem o aux?lio de uma base, n?o houve forma??o de uma rede metalorg?nica. Por outro lado, a presen?a de DMF, como solvente ou co-solvente, proporcionou a desprotona??o do ligante com consequente forma??o das MOFs. Pelo menos duas estruturas cristalinas diferentes foram identificadas para as amostras preparadas com ?cido tereft?lico. Estas amostras apresentam isoestruturas semelhantes ?s reportadas para as fases Eu(1,4-BDC)DMF e Tb(1,4-BDC)H2O. A presen?a de ?gua no meio reacional, m?todo hidro(solvo)t?rmico, direcionou o crescimento da estrutura de maneira diferente da observada quando em sua aus?ncia. Isto pode ser justificado pela diferen?a na forma de coordena??o dos ?ons lantan?deos por ?gua e por DMF. Apesar de n?o terem sido identificadas por DRX, as amostras preparadas com ?cido isoft?lico tamb?m apresentam estruturas metalorg?nicas, confirmadas pelo deslocamento da banda referente ao estiramento do grupo carbonila em rela??o a ligante puro, nos espectros de infravermelho. Este deslocamento tamb?m foi observado nas amostras preparadas com ?cido tereft?lico. As analises de microscopia eletr?nica de varredura sugerem que a morfologia dos p?s e significativamente dependente do tipo de aquecimento usado, convencional ou micro-ondas. / Metal Organic Frameworks (MOFs) are hybrids materials, often crystalline, consisting of metal or metal clusters, connected by polytopic organic ligands repetitively, leading to structures, usually porous. In this work, MOFs based on lanthanide ions (La3+ and Gd3+) and dicarboxylate type of ligands (isophthalic and terephthalic acids), were synthesized by hydrothermal, solvothermal and hydro(solvo)thermal methods. The effects of the synthetic route as well as the type of heating, conventional or by microwave, on the structure and properties of MOFs were studied. The powder samples obtained were characterized by X-ray diffraction, infrared spectroscopy, thermal analysis and scanning electron microscopy. The results suggest that the addition of an organic or inorganic base is needed to promote the deprotonation of the ligand, since in the samples prepared by the hydrothermal method, without the use of a base, no formation of the metalorganic framework was observed. On the other hand, the presence of DMF as solvent or cosolvent, afforded the deprotonation of the ligand with the consequent formation of MOFs. At least two different crystalline structures were identified for the samples prepared with terephthalic acid. These samples are isostructural with those reported for phases Eu(1,3-BDC)DMF, Eu2(1,4-BDC)3 (DMF)2 and Tb(1,4-BDC)H2O. The presence of water in the reaction medium in the hydro(solvo)thermal method, provoked the growth of the structure different from that observed in the absence of water. This can be explained by the difference in the coordination mode of water and DMF to lanthanide ions. Although not identified by XRD, the samples prepared with isophthalic acid, also present metalorganic structures, which was confirmed by the presence of the characteristic displacement of the carbonyl group band in their infrared spectra, compared to the spectrum of the pure ligand. This shift was also observed in the samples prepared with terephthalic acid. Thermal analisys shows that the metal organic frameworks do not collapse occurs at a temperature below 430?C.The analysis of scanning electron microscopy suggests that the morphology of powders is highly dependent on the type of heating used, conventional or by microwave.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-21T19:16:47Z No. of bitstreams: 1 HugoMozerBarrosEustaquio_TESE.pdf: 3247289 bytes, checksum: cf314c70ca721a68d5b56c4493ed445f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-21T20:59:35Z (GMT) No. of bitstreams: 1 HugoMozerBarrosEustaquio_TESE.pdf: 3247289 bytes, checksum: cf314c70ca721a68d5b56c4493ed445f (MD5) / Made available in DSpace on 2016-06-21T20:59:35Z (GMT). No. of bitstreams: 1 HugoMozerBarrosEustaquio_TESE.pdf: 3247289 bytes, checksum: cf314c70ca721a68d5b56c4493ed445f (MD5) Previous issue date: 2015-11-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / O presente estudo aborda a utiliza??o de carv?o ativado comercial na remo??o de ?cidos h?micos em meio aquoso. O objetivo principal ? desenvolver e caracterizar materiais carbon?ceos visando aplica??es de remo??o de ?cidos h?micos em meio aquoso por processos de adsor??o e oxida??o. Testes de remo??o do poluente foram desenvolvidos com a utiliza??o do carv?o comercial, carv?o modificado a partir de tratamentos ?cidos e comp?sito confeccionado com a impregna??o de ferro no carv?o. Espumas de carbono com dispers?es de carv?o ativado e ?xidos de ferro tamb?m foram desenvolvidas buscando aplica??es de remo??o do poluente atrav?s de processos eletroqu?micos. Os resultados das caracteriza??es demonstraram ganho de ?rea superficial a partir do tratamento ?cido, a presen?a dispersa de ferro em todo carv?o na forma de fase maghemita com a introdu??o do metal, e ganho de estabilidade eletroqu?mica na espuma, com a presen?a de dispers?es de carv?o ativados impregnados com ferro. O processo oxidativo Fenton, foto assistido por radia??o UV, demonstrou maior efici?ncia para remo??o do ?cido h?mico em ?gua. / O presente estudo aborda a utiliza??o de carv?o ativado comercial na remo??o de ?cidos h?micos em meio aquoso. O objetivo principal ? desenvolver e caracterizar materiais carbon?ceos visando aplica??es de remo??o de ?cidos h?micos em meio aquoso por processos de adsor??o e oxida??o. Testes de remo??o do poluente foram desenvolvidos com a utiliza??o do carv?o comercial, carv?o modificado a partir de tratamentos ?cidos e comp?sito confeccionado com a impregna??o de ferro no carv?o. Espumas de carbono com dispers?es de carv?o ativado e ?xidos de ferro tamb?m foram desenvolvidas buscando aplica??es de remo??o do poluente atrav?s de processos eletroqu?micos. Os resultados das caracteriza??es demonstraram ganho de ?rea superficial a partir do tratamento ?cido, a presen?a dispersa de ferro em todo carv?o na forma de fase maghemita com a introdu??o do metal, e ganho de estabilidade eletroqu?mica na espuma, com a presen?a de dispers?es de carv?o ativados impregnados com ferro. O processo oxidativo Fenton, foto assistido por radia??o UV, demonstrou maior efici?ncia para remo??o do ?cido h?mico em ?gua.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-22T15:37:57Z No. of bitstreams: 1 TycianneJanynneDeOliveiraCabral_DISSERT.pdf: 2149439 bytes, checksum: 131d03398750f276cbe2491387456242 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-27T23:42:06Z (GMT) No. of bitstreams: 1 TycianneJanynneDeOliveiraCabral_DISSERT.pdf: 2149439 bytes, checksum: 131d03398750f276cbe2491387456242 (MD5) / Made available in DSpace on 2016-07-27T23:42:06Z (GMT). No. of bitstreams: 1 TycianneJanynneDeOliveiraCabral_DISSERT.pdf: 2149439 bytes, checksum: 131d03398750f276cbe2491387456242 (MD5) Previous issue date: 2016-01-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os ?leos vegetais caracterizam-se como mat?rias-primas importantes no fornecimento de subst?ncias naturais de interesse das ind?strias farmac?uticas, aliment?cias e cosm?ticas. O ?leo de girassol destaca-se por apresentar em sua composi??o importantes ?cidos graxos insaturados, como o ?cido oleico (C18:1) e linoleico (C18:2), respons?veis por diversos benef?cios ? sa?de. O principal objetivo do presente trabalho ? a obten??o de fra??es enriquecidas em ?cidos graxos insaturados a partir do ?leo de girassol refinado. O ?leo em estudo foi caracterizado atrav?s da determina??o de algumas propriedades, como ?ndice de iodo, ?ndice de acidez e viscosidade. Uma transesterifica??o foi realizada a fim de transformar os triglicer?deos nos seus correspondentes ?steres met?licos de ?cidos graxos. Estes foram submetidos ao processo de destila??o molecular, por apresentar-se como uma alternativa eficiente para separa??o e purifica??o dessas subst?ncias, utilizando alto v?cuo e temperaturas reduzidas. As fra??es de ?steres obtidas foram analisadas por cromatografia gasosa. A t?cnica de planejamento de experimentos foi empregada a fim de avaliar as melhores condi??es para obten??o das fra??es de destilado, analisando algumas vari?veis, como temperatura do sistema de evapora??o e condensa??o. A temperatura do evaporador mostrou-se como a vari?vel de maior influ?ncia sobre o percentual de destilado obtido. As condi??es otimizadas para a resposta estudada foi de 100?C para temperatura do evaporador e de 10?C para a temperatura do condensador. O gr?fico de ?Split ratio? mostrou que para a menor vaz?o de alimenta??o (1mL/min) e maior temperatura do evaporador (110 ?C), foi obtida a maior fra??o de destilado. Foi realizado ainda, o estudo da influ?ncia da temperatura do evaporador sobre a concentra??o de compostos insaturados. A melhor condi??o de opera??o foi para a temperatura de 90?C, alcan?ando 82,22% de compostos insaturados. Foram obtidas as curvas de elimina??o dos compostos insaturados presentes na corrente de destilado. Os resultados da simula??o do processo de destila??o molecular do ?leo de girassol mostraram os perfis de concentra??o para tr?s diferentes vaz?es de alimenta??o. Foram obtidos os perfis de velocidade, temperatura e espessura do filme l?quido. A velocidade do filme aumenta ? medida que o fluido escorre pelas paredes do evaporador, atingindo um valor m?ximo no comprimento de 0,075 m. A espessura do filme diminui ao longo do percurso, uma vez que muitos compostos s?o volatilizados. O resultado do perfil de temperatura apresentou-se coerente com os reproduzidos pela literatura, mostrando-se constante ap?s atingir a temperatura m?xima de opera??o no comprimento de 0,15 m. Dessa forma, o presente trabalho permitiu caracterizar e concentrar, por meio da an?lise experimental, os compostos insaturados, bem como observar o comportamento do ?leo de girassol atrav?s da simula??o do processo. / Vegetable oils are characterized as important raw materials in the supplying of natural substances of interest pharmaceutical, food and cosmetic industry. Sunflower oil stands out for its important composition present in unsaturated fatty acids such as oleic acid (C18:1) and linoleic (C18:2), responsible for many health benefits. The main objective of this study is obtain enriched fractions in unsaturated compounds from refined sunflower oil. The oil used in this study was characterized by the determination of some properties, like iodine number, acid number and viscosity. A transesterification was done to transform the triglycerides into their corresponding methyl esters of fatty acids. These was submitted the molecular distillation process, for present as an efficient alternative to separation and purification of these substances, using high vacuum and low temperatures. Of the esters fractions that was obtained, were analyzed by gas chromatography. The experimental design technique was used to evaluate the influence of the temperature variation of evaporation and condensation system on the percentage obtained residue. The evaporator temperature proved to be the most influential variable on the studied response. The optimized conditions for the answer was studied at 100 ?C for evaporator temperature and 10 ?C for the condenser temperature. The graph of "split ratio" showed that for the lowest flow feed (1 mL/min) and higher evaporator temperature (110 ?C) was obtained in the largest fraction of distillate. It also used the study of the influence of evaporator temperature on the concentration of unsaturated compounds. The best operating conditions for temperature was 90 ?C reached 82.21 % of unsaturated compounds. Elimination curves of the unsaturated compounds present in the distillate stream were obtained. The simulation results of the molecular distillation process of sunflower oil showed the concentration profiles for three different feed flow rates. The speed, temperature and thickness profiles of the liquid film were obtained. The speed of the film increases as the fluid flows through the walls of the evaporator, reaching a maximum on length of 0.075 m. The film thickness decreases on the route, since many compounds are volatilized. The result of the temperature profile had to be consistent with the literature reproduced, being constant after reaching the maximum operating temperature in the length of 0.15 m. This study allowed characterizing and focusing, through experimental analysis, unsaturated compounds and observing the sunflower oil?s behavior through process simulation.