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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Tolerance of common lambsquarters (Chenopodium album L.) to glyphosate

Kniss, Andrew R. January 2006 (has links)
Thesis (Ph. D.)--University of Wyoming, 2006. / Title from PDF title page (viewed on June 30, 2008). Includes bibliographical references (p. 80-92).
2

Über das Schicksal Überlebender nach Vergiftung mit Oleum chenopodii anthelmintici

Rossetti, Mario, January 1900 (has links)
Inaug.-Diss.--Basel. / At head of title: Aus der Kinderklinik der Universität Basel. Curriculum vitae. Bibliography: p. 29-30.
3

Über das Schicksal Überlebender nach Vergiftung mit Oleum chenopodii anthelmintici

Rossetti, Mario, January 1900 (has links)
Inaug.-Diss.--Basel. / At head of title: Aus der Kinderklinik der Universität Basel. Curriculum vitae. Bibliography: p. 29-30.
4

Estudo comparativo da composição e dos efeitos do tratamento termico em quatro variedades de quinua (Chenopodium quinoa, Willd)

Telleria Rios, Mario Luis 17 July 2018 (has links)
Orientador : Valdemiro Carlos Sgarbieri / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos / Made available in DSpace on 2018-07-17T06:06:17Z (GMT). No. of bitstreams: 1 TelleriaRios_MarioLuis_M.pdf: 1437052 bytes, checksum: 6c77ca15e1c977e70b0a61cd65443dbd (MD5) Previous issue date: 1976 / Resumo: O objetivo deste trabalho foi o de estudar o efeito da temperatura na extração de saponinas, na composição e no valor biológico de quatro variedades bolivianas de quínua (Chenopodium quínoa, Willd). Realizou-se a lavagem ou extração das saponinas em condições padronizadas a 50, 70 e 87°C, observando-se numa das variedades um aumento no conteúdo de proteína bruta (%N x 6,25) em relação direta com a temperatura usada, enquanto que nas outras restantes obteve-se a máxima porcentagem de proteína a 70°C. O maior valor encontrado para saponinas pelo método do "Índice Afrosimétrico", foi de 2,8% em base seca; para a variedade Colorada e o mínimo de 1,7% em base seca para a variedade Sajama nas amostras integrais, observando-se ainda uma pequena porcentagem residual nas tratadas a 50°C. Nas amostras tratadas a 70 e 87, verificou-se completa eliminação das saponinas. Observou-se um aumento na porcentagem de aminoácidos em três das amostras lavadas a 87°C, que poderia ser explicado pela extração de compostos nitrogenados que não contêm aminoácidos, o que aumentaria a concentração de proteína verdadeira na amostra. Pelo índice protéico (Protein Score) observou-se que em 7 das 8 amostras analisadas, os aminoácidos limitantes são os sulfurados, e na restante o triptofânio, tomando como referência o padrão da FAO (1965). Em comparação aos aminoácidos da caseína os limitantes são a isoleucina, o triptofânio e a valina. O PER máximo foi obtido para á variedade Blanca tratada a 87°C com um valor de 2,99, seguida da Sajama, também a 87°C, com 2,72, contra 3,21 da caseína, demonstrando a semelhança com qualidades nutricionais dessas proteínas. As curvas de crescimento dos ratos que receberam quínua tratada a 87°C foram também muito semelhantes à da caseína. Nas curvas de solubilidade em função de pH, observou-se a semelhança só para duas variedades, enquanto que para as outras foram verificadas grandes diferenças. A análise das curvas de solubilidade permite concluir pela existência de duas ou mais frações protéicas com pontos isoelétricos bem diferentes. A extração fracionada mostrou que as globulinas constituem a principal fração em todas as amostras estudadas variando de 26 a 45% da proteína bruta, seguidas das albuminas que têm de 4,5 a 20% e prolaminas, como a menor fração variando de 0,5 a 8%. As proteínas residuais (não extraídas) foram tidas como glutelinas e proteínas insolúveis, calculadas por diferença, representando 12 a 51% das proteínas totais / Abstract: The purpose of this work was to study the temperature dependence of the (1) saponins extraction, (2) the composition and (3) The biological value of four Bolivian varieties of quinua (Chenopodium quinoa, Willd.). Extraction or washing of the saponins was routinely accomplished at temperatures of 50, 70 and 879C. The concentration of protein in the washed samples was affected by the temperature. The increase in concentration was maximum for three samples washed at 70°C, while a fourth one showed maximum concentration at 87°C. Saponins, as measured by their foaming activity ranged from 2.8% (dry basis) in the untreated Colorada Flour to 1.7% for the untreated Sajama flour. Although complete removal was accomplished at 70 and 87°C a small residual activity remained in the samples treated at 50°C. An increase in amino acid content was observed in three of the samples washed at 87°C, which could be explained by the simultaneous extraction of nitrogenous components lacking in amino acids. In general the sulfur amino acids were limiting (Protein Score, FAO pattern 1965) in both washed and unwashed samples. By comparing with amino acid patter~ of casein, limiting amino acids were isoleucine, tryptophan and valine. Highest PER values were obtained for the varieties Blanca(2.99) and Sajama (2.72) both treated at 879C, as compared with casein (3.21). Solubility curves a function of pH, were determined and suggested the presence of two or more proteins fractions which differ substancially in their isoelectric properties. Differential extraction showed that the globulins (the main fraction in all varieties studied) varied from 26 to 45% of the crude protein. These were followed by alburnins (4.5 to 20%) and prolarnins (0.5 to 8%). Glutelins and insoluble proteins calculated by difference accounted for 12 to 51% of total proteins / Mestrado / Mestre em Tecnologia de Alimentos
5

Elaboración y caracterización de dos bebidas proteicas, una a base de quinua malteada y la otra a base de quinua sin maltear (chenopodium quinoa)

Alvarez Carita, Yenny Cecilia 17 January 2013 (has links)
El presente trabajo de investigación estuvo orientado a elaborar y caracterizar dos bebidas proteicas a base de quinua malteada y quinua sin maltear (Chenopodium quinoa) mediante análisis proximales, fisicoquímicos, microbiológicos y sensoriales. Se empleó quinua de la variedad Blanca de Junín procedente del INIA-Cusco. La evaluación sensorial fue realizada mediante el Test de Preferencia de la Escala Hedónica. Se aplicaron diseños experimentales en el proceso de malteo de la quinua y evaluación sensorial de los productos terminados. Los resultados fueron analizados mediante un análisis de varianza a un α = 5%. La caracterización de la quinua reportó: bajo contenido de saponina (< 0,06%), alto poder germinativo (> 90%), % acidez = 0,16, pH = 3,95, buena calidad sanitaria y una composición proximal de: humedad 13,49%, proteínas 10,23%, lípidos 6,28%, cenizas 2,56%, fibra 2,80% y carbohidratos 67,44%. El malteo de la quinua reportó como condiciones óptimas un tiempo de 4 h y cantidad de agua de 1:1,5 en relación grano: agua, en la etapa de remojo; y un tiempo de 3 días en la etapa de germinado. Alcanzándose un alto grado de germinación y una mayor conversión de azúcares reductores (5,11%). El malteo elevó el valor nutricional de la malta de quinua; siendo esta igual a: humedad 7,02%, proteínas 10,59%, lípidos 6,62%, cenizas 2,80%, fibra 2,82% y carbohidratos 72,97%. La caracterización de las bebidas proteicas reportó en promedio: % acidez = 0,20, pH = 4,025, buena calidad sanitaria y una composición proximal de humedad 87,35%, proteínas 0,81%, lípidos 0,51%, cenizas 0,21%, fibra 0,21% y carbohidratos 11,13%. Se detectaron diferencias significativas entre ambas bebidas con relación al color, olor y sabor; resultando la bebida proteica a base de quinua malteada la de mayor aceptación. Ambas bebidas proteicas presentaron características nutricionales, microbiológicas y sensoriales aceptables. Lo que demuestra que pueden ser empleadas como una alternativa en la alimentación.
6

Relationships Among AA-Genome Chenopodium Diploids and a Whole-Genome Assembly of the North American Species, C. watsonii

Young, Lauren Amillicent 06 June 2022 (has links)
Chenopodium quinoa Willd., an ancient Andean pseudocereal almost exclusively consumed in South America, jumped onto the global stage when Western cultures noted quinoa's advantageous nutritional profile. Quinoa seed's high protein content, nutritionally balanced amino acid profile, low glycemic index, and high fiber, vitamin, and mineral content, make it a highly sought-after 'superfood'. Pitseed goosefoot (C. berlandieri Moq.), a closely related North American species sharing quinoa's genome composition (AABB), grows across the North American continent, inhabiting diverse environments including the saline coastal soils of the Gulf of Texas and the drought-prone regions of the Southwest. Quinoa and pitseed goosefoot, along with South American avian goosefoot (C. hircinum Schrad.), make up the Allotetraploid Goosefoot Complex (ATGC). We hypothesize that an ancient hybridization event between A- and B-genome diploids, with a subsequent whole-genome duplication, gave rise to the common ancestor of the ATGC. Prior data indicate that allopolyploidization most likely occurred within North America, with long-range dispersal of the ATGC to South America. We have sequenced the genome of the North American AA-genome diploid C. watsonii and identified via DNA marker analyses the closest extant species to the AA-genome diploid ancestor of the ATGC from among a panel of 41 AA-genome diploid resequenced accessions, encompassing 30 putative AA-genome diploid species, from North and South America. We also present evidence for reciprocal long-range dispersal of Chenopodium diploids between North and South America.
7

Původci odumírání klíčních rostlin Chenopodium quinoa a možnosti ochrany

Dřímalková, Monika January 2003 (has links)
No description available.
8

Cloning and Characterization of the Salt Overly Sensitive 1 (SOS1) Gene in Chenopodium quinoa WILLD.

Turner, Taylor Brian 17 July 2007 (has links) (PDF)
Salt tolerance is a commercially important trait that affects plant species around the globe. Cellular response to saline environments is a well studied but complex system that is far from being completely understood. The SALT OVERLY SENSITIVE 1 (SOS1) gene is a critical component of salt tolerance in many species, encoding a plasma membrane Na+/H+ antiporter that plays an important role in germination and growth in saline environments. Here we report a preliminary investigation of salt tolerance in quinoa (Chenopodium quinoa Willd.). Quinoa is a halophytic grain crop of the Chenopodiaceae family with impressive nutritional content and an increasing world-wide market. Many quinoa varieties have impressive salt tolerance characteristics and research suggests quinoa may utilize novel mechanisms to confer salt tolerance. At this time there is no published data on the molecular characteristics of those mechanisms. We report the identification and sequencing of the SOS1 gene in quinoa, including a full length cDNA sequence of 3490 bp and a full length genomic clone of 21314 bp. Sequence analysis predicts the quinoa SOS1 homolog spans 23 exons and is comprised of 3474 bp of coding sequence (excluding the stop codon). Introns comprise 17840 bp of the genomic clone and range in size from 77 to 2123 bp. The predicted protein contains 1158 amino acid residues and aligns closely with SOS1 homologs of other species. The quinoa SOS1 homolog contains two putative domains, a Nhap cation-antiporter domain and a cyclic-nucleotide binding domain. Sequence analyses of both cDNA fragments and intron fragments suggest that two SOS1 loci are present in the quinoa genome that are likely orthologous loci derived from the ancestral diploid genomes of the modern allotetraploid quinoa genome. This report represents the first molecular characterization of a putative salt-tolerance gene in C. quinoa.
9

Nanocristais de amido de quinoa: produção, caracterização e aplicação em filmes de amido / Quinoa starch nanocrystals: production, characterization and application in starch films

Velásquez Castillo, Lía Ethel 25 July 2018 (has links)
Nos últimos anos, pesquisas sobre a produção de nanocristais de amido (NCA) receberam interesse crescente devido a suas diversas aplicações, principalmente como material de reforço de matrizes poliméricas. Nesse contexto, o amido de quinoa (AQ) apresenta características desejáveis na produção de NCA tais como tamanho de grânulo pequeno e conteúdo de amilose relativamente baixo. Assim, o objetivo desta pesquisa foi produzir NCA de quinoa (NCAQ) por hidrólise ácida em diferentes temperaturas (30, 35 e 40) °C. Além disso, foi estudado o efeito da adição dos NCAQ nas propriedades estruturais e físicas de filmes de amido de mandioca. O AQ apresentou diferentes percentagens de hidrólise, no quinto dia, 63%, 73% e 91% para (30, 35 e 40) °C, respectivamente. O AQ (k = 0,59 dias-1) foi hidrolisado mais rápido que o amido de milho ceroso (k = 0,39 dias-1) a 40 °C. O rendimento dos NCAQ diminuiu com o incremento da temperatura de 30 a 40 °C; enquanto que a cristalinidade relativa dos NCAQ não foi alterada (~35%). A morfologia dos NCAQ produzidos a 30 °C foi irregular com tamanho micrométrico, enquanto que os produzidos a 35 e 40 °C apresentaram forma de paralelepípedo com tamanhos entre (50 e 100) nm e (400 e 900) nm (agregados). O diâmetro hidrodinâmico e as propriedades térmicas dos NCAQ diminuíram com o aumento da temperatura da hidrólise; enquanto que a intensidade das bandas FTIR e o potencial zeta aumentaram. As propriedades indicaram que NCAQ foram produzidos somente a (35 e 40) °C com rendimentos de 22,7% e 6,8%, respectivamente. Dessa forma, considerando o rendimento e a temperatura de transição, os NCAQ produzidos a 35 °C foram selecionados para aplicação em filmes de amido de mandioca. Os filmes foram preparados pela técnica do casting, com 4 g de amido de mandioca/100 g de dispersão filmogênica; 25 g glicerol/ 100 g de amido; e 0; 2,5; 5,0 e 7,5 g de NCAQ/ 100 g de amido. Os difratogramas de raios X confirmaram a presença dos NCAQ nos filmes. A adição de NCAQ nos filmes aumentou a rugosidade e o ângulo de contato em concentrações de 5% e 7,5%, a resistência à tração e o módulo elástico, os parâmetros de cor L* e a* em concentrações 7,5%, e a opacidade; enquanto que diminuiu a deformação na ruptura, a permeabilidade ao vapor de água na concentração de 5%, e o brilho. Outras propriedades dos filmes como espessura, umidade, solubilidade, propriedades térmicas não foram alteradas pela adição de NCAQ. Os resultados indicaram que os NCAQ produzidos a 35 °C podem ser usados como reforço em filmes nanocompósitos para melhorar suas propriedades mecânicas. / Recently researches on starch nanocrystals (SNC) production have become of interest due to their many applications, especially as reinforcement in polymeric matrices. Quinoa starch (QS) has desirable characteristics for SNC production such as small granule size and relatively low amylose content. Thus, the objective of this research was to produce quinoa SNC (QSNC) by acid hydrolysis at different temperatures (30, 35 and 40) °C. Furthermore, the effect of QSNC addition on the structural and physical properties of cassava starch films was studied. QS presented different percentages of hydrolysis on the fifth day, 63%, 73% and 91% for (30, 35 and 40) °C, respectively. QS (0.59 days-1) was hydrolyzed more rapidly than waxy maize starch (0.39 days-1) at 40 °C. QSNC yields decreased with temperature increase from (30 to 40) °C, while the relative crystallinity was not altered (~35%). The morphology of QSNC produced at 30 °C was irregular with micrometric size while those produced at 35 °C and 40 °C presented parallelepiped shapes with sizes between 50 nm and 100 nm and 400 nm to 900 nm (aggregates). The hydrodynamic diameter and the thermal properties of QSNC decreased with temperature increase, while the FTIR band intensities and the zeta potential increased. The properties indicated that quinoa QSNC were only obtained at (35 and 40) °C with yields of 22.8% and 6.8%, respectively. QSNC produced at 40 °C presented lower yield and crystallinity than waxy maize SNC, but a lower hydrodynamic diameter. Thus, based on the yield and transition temperature, QSNC produced at 35 °C was selected for application in cassava starch films. The films were prepared by casting technique, with 4 g of cassava starch / 100 g of film forming dispersion; 25 g glycerol / 100 g starch; and 0; 2.5; 5.0 and 7.5 g of QSNC / 100 g of starch. X-ray diffractograms confirmed the presence of QSNC in the films. Addition of QSNC to films increased the roughness and the contact angle at 5.0% and 7.5% concentrations, the tensile strength and elastic modulus, the color parameters L* and a* at 7.5% concentration, and the opacity; while decreasing deformation at break, water vapor permeability at 5.0% concentration, and gloss. Other film properties such as thickness, moisture content, solubility, thermal properties were not affected by QSNC addition. The results indicated that the QSNC produced at 35 ° C can be used as reinforcement in nanocomposite films to improve their mechanical properties.
10

Efeito da ingestão de grãos processados de quinoa por pacientes coronariopatas dislipêmicos

Silva, Vanessa Oliveira 01 December 2015 (has links)
Submitted by Fabíola Silva (fabiola.silva@famerp.br) on 2016-06-21T17:35:47Z No. of bitstreams: 1 vanessaoliveirasilva_dissert.pdf: 429106 bytes, checksum: 44bf78bbec8e150eef1119e341151324 (MD5) / Made available in DSpace on 2016-06-21T17:35:47Z (GMT). No. of bitstreams: 1 vanessaoliveirasilva_dissert.pdf: 429106 bytes, checksum: 44bf78bbec8e150eef1119e341151324 (MD5) Previous issue date: 2015-12-01 / Introduction: Quinoa (Chenopodium quinoa Willd) is a gluten-free pseudocereal with high biological value protein, low glycemic carbohydrates, phytosterols and omega 3 and 6 fatty acids. It originates from the Andes, where it has been consumed for thousands of years.The aim of this study was to determine the rates of outpatient serum lipids in coronary patients after ingestion of processed grain quinoa.This is a prospective study of twenty-seven outpatients 48-70 years of age (64.0 ± 8.4 years) who were treated for an average of 120– 200 days.Blood samples were collected before and after consumption of the cereal to determine the dyslipidemic profile of the group and the exams were attended.The results showed a positive effect of the use of quinoa once it has been observed a significant reduction in total cholesterol levels (P = 0.0008), triglycerides (P = 0.001) and LDL-c (p = 0.008). We conclude that the use of quinoa in the diet can be considered beneficial in the prevention and treatment of risk factors of cardiovascular diseases that are among the leading causes of death in the globalized world. / Introdução: A quinoa (Chenopodium quinoa Willd) é um pseudocereal isento de glúten, com proteína de alto valor biológico, carboidratos de baixo índice glicêmico, fitosteróis e ácidos graxos ômega 3 e 6. É originária dos Andes, onde vem sendo consumida há milhares de anos. O objetivo deste trabalho foi verificar as taxas de lipídeos séricos em pacientes coronariopatas ambulatoriais após a ingestão de grãos processados de quinoa. Trata-se de um estudo prospectivo com vinte e sete pacientes com 48 a 70 anos de idade (64,0 ± 8,4 anos), que foram tratados por 120 a 200 dias. As amostras de sangue foram coletadas antes e após o consumo do cereal para determinar o perfil lipidêmico do grupo e os exames foram acompanhados. Os resultados mostraram efeitos positivos do uso da quinoa já que se observou redução significante nos valores de colesterol total (P=0,0008), triglicérides (P=0,001) e LDL-c (P=0,008). Conclui-se que o uso da quinoa na alimentação pode ser considerado benéfico na prevenção e controle de fatores de risco de doenças cardiovasculares (DC) que estão entre as principais causas de morte no mundo globalizado.

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