SANTRAUKA Raktažodžiai: energinis gėrimas, kofeinas, taurinas, vaikai, perdozavimas, alkoholis. Darbo tikslas. Nustatyti gaiviųjų energinių gėrimų vartojimo paplitimą Vilniaus miesto 5-10 klasių mokinių tarpe ir įvertinti jų žinias apie šiuos gėrimus. Metodai. Tyrimas atliktas anoniminės anketinės apklausos būdu. Anketą sudarė 35 klausimai. Apklausti 1837 trylikos Vilniaus miesto ugdymo įstaigų 5 – 10 klasių mokiniai. Surinktų anketų duomenys buvo apdoroti naudojantis statistinio paketo SPSS 17.0 versija. Kokybiniams dydžiams tirti, požymių homogeniškumui grupėse tikrinti, ryšiui tarp kintamųjų įvertinti naudotas Chi kvadrato (&#61539;2) testas, o mažiems skaičiams (n < 5) – Fišerio (F) tikslusis testas. Rezultatų skirtumas tarp kintamųjų laikytas statistiškai reikšmingu, kai p &#8804; 0,05. Ieškant statistinių-koreliacinių ryšių tarp kintamųjų, apskaičiavimams naudotas statistinis ryšio stiprumą ir kryptį rodantis Spearmano koreliacijos koeficientas. Dviejų nepriklausomų imčių neparametriniam palyginimui buvo naudojamas Mann’o ir Whitney U testas, o daugiau negu dviem nepriklausomoms imtims palyginti – Kruscal’o ir Wallis’o testas. Rezultatai. Nustatyta, kad energinius gėrimus vartojo 32,8 proc. mokinių, juos buvo vartoję, bet nebevartojo tyrimo metu 34,4 proc. ir niekada nevartojo – 32,8 proc. respondentų. Juos vartojo statistiškai reikšmingai daugiau berniukų negu mergaičių ir 7 – 10 klasių mokinių negu 5, 6 klasių. Daugiausiai respondentų energinius gėrimus vartojo 1 k... [toliau žr. visą tekstą] / SUMMARY Key-words: energy drink, caffeine, taurine, children, overdosing, alcohol. The aim of the paper: Ascertain the prevalence of energy drinks consumption among the 5 – 10 th form pupils in Vilnius city and evaluate their knowledge about these drinks. Methods: A method of anonymous questionnaires was used, made up of 35 questions. 1837, 5-10 form pupils of 13 educational institutions in Vilnius city were questioned. For data analysis SPSS program version 17.0. was used. Qualitative coherence between variables is established by Chi-square (&#61539;2) test, while small numbers (n less 5) by Fisher’s (F) exact test. Disparity of result between variables assessed statistically important, when p &#8804; 0.05. Searching for statistical – correlative relationship between variables, for computation Spearman’s correlation coefficient. of statistical connection intensity and direction was used. The Mann Whitney U test of two independent samples of non-parametric comparison was used and for more than two independent samples – Kruskal Wallis test. Results: Ascertained, that energy drinks are used by 32.8 % schoolchildren, were using, but have not used during testing 34.4 % and 32.8 % of respondents had never used. Statistics show more significant consumption among boys than girls and more of 7-10 forms schoolchildren in comparison with 5-6 forms. The largest number of respondents used energy drinks once a week (22.6 %), 19.2% - once a month and 17.2 % - twice or four times a month... [to full text]

Human Systems Integration Report / Detailed research conducted over the past forty years has conclusively determined that varying degrees of sleep loss, shifts in sleep cycle, increased stress and even changes in time zone with respect to daylight transition result in a myriad of physiological and psychological degradations (Helmreich, 2000). Fatigue affects human performance, resulting in predictable changes not only on the individual level but also on the system as a whole. This descriptive study investigates the amount and quality of sleep received by aviation personnel assigned to an operational squadron conducting mine hunting operations. Wrist activity monitors (actigraphs) were used to determine objective assessments of sleep quantity and quantity. Demographic variables and additional measures such as reported sleepiness, fatigue ratings, caffeine and alcohol use, were also collected. Despite a number of factors which altered the original study design, significant differences in amount of sleep, sleep quality and predicted effectiveness of personnel by officer-enlisted status were identified.

This thesis concerns experiments with natural compounds and vitamins. In the first part I described these substances, which I proved by chromatography or I made other experiments with them in the second part. I created four worksheets with instruction for laboratory practise. There are thein solutions in the supplement. I verified these four experiments at Grammar School in Prague 9.

This diploma thesis is focused on theoretical and practical aspects of High performance liquid chromatography (HPLC). This method is introduced as one of the most frequently used current analytical methods. The theoretical part of thesis is focused on instrumentation of HPLC and particular components of HPLC analytical system. The most often used mobile phases and static phases are described as well. Based on these theoretical aspects, laboratory exercise using HPLC for future teachers is designed. Caffeine is used as ideal model material for this exercise. Caffeine is well-known substance, because of its traditional usage for example in food-processing industry. Final part of this thesis is brief view on framework educational programmes for primary and secondary education. As appendix of this thesis, manual for referenced laboratory exercise is provided. KEYWORDS chromatography, caffeine, HPLC, instrumentation of HPLC, teacher training, RVP

Carbohydrates are essential biomolecules that decorate cell membranes and proteins in organisms. They are important both as structural elements and as identification markers. Many biological and pathogenic processes rely on the identification of carbohydrates by proteins, thereby making them attractive as molecular blueprints for drugs. This thesis describes how NMR spectroscopy can be utilized to study carbohydrates in solution at a molecular level. This versatile technique facilitates for investigations of (i) shapes, (ii) motions and (iii) interactions. A conformational study of an E. coli O-antigen was performed by calculating atomic distances from NMR NOESY experiments. The acquired data was utilized to validate MD simulations of the LPS embedded in a membrane. The agreement between experimental and calculated data was good and deviations were proven to arise from spin-diffusion. In another study presented herein, both the conformation and the dynamic behavior of amide side-chains linked to derivatives of D-Fucp3N, a sugar found in the O-antigen of bacteria, were investigated. J-couplings facilitated a conformational analysis and 13C saturation transfer NMR experiments were utilized to measure rate constants of amide cis-trans isomerizations. 13C NMR relaxation and 1H PFG diffusion measurements were carried out to explore and describe the molecular motion of mannofullerenes. The dominating motions of the mannofullerene spectral density were found to be related to pulsating motions of the linkers rather than global rotational diffusion. The promising inhibition of Ebola viruses identified for a larger mannofullerene can thus be explained by an efficient rebinding mechanism that arises from the observed flexibility in the linker. Molecular interactions between sugars and caffeine in water were studied by monitoring chemical shift displacements in titrations. The magnitude of the chemical shift displacements indicate that the binding occurs by a face to face stacking of the aromatic plane of caffeine to the ring plane of the sugar, and that the interaction is at least partly driven by solvation effects. Also, the binding of a Shigella flexneri serotype Y octasaccharide to a bacteriophage Sf6 tail spike protein was investigated. This interaction was studied by 1H STD NMR and trNOESY experiments. A quantitative analysis of the STD data was performed employing a newly developed method, CORCEMA-ST-CSD, that is able to simulate STD data more accurately since the line broadening of protein resonances are accounted for in the calculations. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript.</p>

Orientador: Maria Virgínia Costa Scarpa / Banca: Maria Valéria Robles Velasco / Banca: Marcos Antônio Corrêa / Resumo: A mistura de óleo, água e tensoativo é capaz de formar estruturas e sistemas variados, dependendo das características e da proporção dos componentes utilizados. Sistemas microestruturados, como cristais líquidos e microemulsões, são utilizados para encapsular fármacos e substâncias ativas em produtos farmacêuticos e cosméticos. O objetivo desse trabalho foi desenvolver sistemas microestruturados para a incorporação da cafeína com finalidade de uso tópico para otimizar o tratamento da hidrolipodistrofia ginóide. A mistura direta de PPG-5-Ceteth-20 (tensoativo), adipato de dibutila (fase oleosa) e água em diferentes proporções possibilitou a obtenção de formulações com formas de estruturação variadas, como microemulsão, emulsão e mesofases líquido-cristalinas. As formulações obtidas foram caracterizadas por meio de microscopia de luz polarizada, determinação de índice de refração, densidade relativa e condutividade e comportamento reológico. Estudos de solubilidade mostraram que os sistemas foram capazes de solubilizar cerca de 1,5% de cafeína. Estudos de liberação in vitro, que utilizaram modelo de célula de difusão em sistema estático do tipo Franz adaptada ao equipamento de dissolução indicaram que as formulações apresentaram características de sistemas reservatórios de liberação prolongada. Para o estudo de permeação in vivo foram utilizados suínos machos, Landrace x Large White, submetidos ao tratamento com formulação acrescida ou não de cafeína. Fragmentos de pele e hipoderme foram retirados para a análise histológica. A formulação com características de cristal líquido de fase hexagonal foi eficaz em aumentar a permeação cutânea à cafeína, facilitando assim sua ação. A cafeína aplicada desta forma fez com que houvesse uma redução significativa da espessura da hipoderme. O sistema atua como promotor de permeação e garante a eficácia da cafeína no tratamento da celulite. / Abstract: Oil, water and surfactant mixture may form a variety of structures and phases accordingly to the characteristics and the ratio of the used components. Microcompartmented systems as liquid crystals and microemulsions are used to encapsulated drugs and active substances in pharmaceutical and cosmetic products. The objective of this research was the development of microcompartmented systems for incorporation of caffeine with the purpose of topical use on treatment of the gynoid lipodystrophy. The direct mixture of PPG-5-Ceteth-20 (surfactant), dybutyl adipate (oil phase) and water in differents proportions made possible to obtain formulations with different structuring forms as microemulsions, emulsions and liquid crystalline mesophases. The formulations were characterized through the polarization light microscopy, refractive index, relative density, conductivity and behavior rheological. Solubility studies were accomplished showed that the systems were capable to solubilize about 1,5% of caffeine. In vitro release studies using the cell of diffusion model in static system of Franz's type adapted to the dissolution equipment indicated formulations with characteristics of reservoirs systems. The permeability study in vivo used male pig (Landrace x Large White) and they were submitted to the treatment. Formulations with or without caffeine were applied. Skin's fragments and hypoderm of them were removed for histology analysis after the treatment. The formulation with liquid crystal of hexagonal phase characteristics was efficient in increasing skin permeability to the caffeine, thus facilitating its drug action. The application of caffeine this way led to a significant reduction of the hypoderms thickness. The developed system is adjusted for topical use, is skin penetration enhancers and it guarantees the effectiveness of the caffeine in the treatment of the cellulite. / Mestre

Orientador: Antonio de Queiroz Neto / Banca: José Correa de Lacerda Neto / Banca: Wilson Roberto Fernandes / Banca: Flávio Desessards de La Cortê / Banca: Thiago Luiz de Salles Gomes / Resumo: Metodos costumeiramente empregados no estudo da fisiologia do exercicio podem ser utilizados para avaliar os efeitos de substancias licitas (ergogenicos) ou ilicitas (doping) sobre a capacidade atletica. Estudaram-se algumas respostas endocrinas, metabolicas, cardiacas e hematologicas de equinos, treinados, da raca Puro Sangue Arabe (PSA) submetidos ao exercicio intenso e a administracao isolada de cafeina (CAF), aminofilina (AM) ou clembuterol (CL), 30 minutos antes do esforco fisico, nas doses de 5 mg.kg-1, 10 mg.kg-1 e 0,8 Êg.kg-1 de peso corporeo, respectivamente. Para avaliacao dos efeitos do exercicio e farmacos empregou-se exercicios testes em esteira rolante, utilizando-se inclinacao de 10% com incrementos de velocidade, sendo realizadas colheitas de sangue 15 segundos antes do termino de cada etapa. Nas amostras de sangue foram quantificados hematocrito, contagem de hemacias, hemoglobina e leucocitos totais, alem da glicemia, lactacidemia, insulinemia, cortisolemia. Tambem avaliou-se a frequencia cardiaca. Para todas analises estatisticas realizadas, estabeleceu-se como nivel de significancia p.0,05. Os resultados mostram que a CAF elevou significativamente a lactacidemia, glicemia e o hematocrito, mas reduziu a insulinemia e a cortisolemia. Para AM houve elevacao significativa da glicemia no inicio do exercicio e reducao nas etapas de exercicio maximo, sendo tambem observado aumento da lactacidemia. O CL provocou elevacao significativa da frequencia cardiaca e insulinemia. A cafeina prejudicou a capacidade aerobica, mas aumentou metabolismo anaerobico. Ja a aminofilina parece interferir na homeostase da glicemia durante o exercicio intenso, mas melhorou a via glicolitica anaerobica. Finalmente, o clembuterol nao melhorou a capacidade aerobica e, marcadamente, prejudicou a resposta cardiaca, bem como aumentou a insulinemia. / Abstract: Currently, equine exercise physiology is in a considerable development in Brazil. The use of scientific methods for the evaluation of the exercise and training protocols is fundamental for the maximization of equine performance. It also can be applied to evaluate the effects of legal (ergogenics) and/or illegal substances during competitions on athletic horses. Some metabolic, endocrine, cardiac and hematologic responses of trained Arab horses submitted to intense exercise and to the administration of caffeine, aminophylline and clenbuterol, a single dose given at 30 minutes before the effort. Doses were, respectively, 5 mg.kg-1, 10 mg.kg-1 and 0,8 Êg.kg-1. A treadmill was employed for the evaluation of exercise and drug effects, with 10% slope and speed increments. Blood samples were withdrawn 15 seconds before the end of each exercise bout. Hematocrit, erythrocytes and leucocytes count, hemoglobin, glucose, lactate, insulin and cortisol concentration, were determined. Heart rate was also monitored at the same time points. A minimum criterion of P.0,05 was adopted for statistical significance. Our results revealed significant variations in all physiologic parameters studied. Caffeine impaired the aerobic capacity but improved the aerobic potency. Aminophylline interfered in glycemic curve during intense exercise, but improved anaerobic performance. Finally, clenbuterol did not improve the parameters association with aerobic metabolism, but, markedly, impaired cardiac response, and increased insulin concentration compromising glycemic control during intense exercise. / Doutor

A cafeína está presente no cotidiano humano desde o tradicional café até como constituinte de medicamentos, estimulantes, chás, chocolate entre outros produtos alimentícios. Essa substância é considerada um contaminante orgânico emergente provindo de águas residuárias não tratadas. Sua presença nos corpos hídricos vem sendo documentada em baixas concentrações, desde &eta;g.L-1 até &#181;g.L-1 e os efeitos dessas concentrações nos organismos aquáticos ainda não foram efetivamente investigados. Com o objetivo de avaliar os efeitos tóxicos da cafeína em concentrações comumentemente encontradas em corpos hídricos, foram realizados testes de ecotoxicidade aguda e crônica com os organismos-teste Chironomus sancticaroli e Daphnia magna e intergeracional com C. sancticaroli, com enfoque em respostas biológicas de mortalidade, imobilidade, crescimento, desenvolvimento e reprodução. Como resultado, a cafeína não apresentou toxicidade aguda no teste de curta duração realizado para D. magna e C. sancticaroli. Foi observado efeito de toxicidade crônica da cafeína, havendo interferência no desenvolvimento das larvas de Chironomus principalmente na concentração de 200 &#181;g.L-1 e no crescimento e reprodução de D. magna, na qual foi observada indução na produção de neonatos e desaceleração para o desenvolvimento do organismo (retardo no processo de ecdise). No teste intergeracional, foram observadas mudanças nos padrões de desenvolvimento larval. Os resultados demonstram que a cafeína, em concentrações ambientalmente detectadas, pode causar pequenas alterações no ciclo de vida dos organismos, como por exemplo, alterações no tamanho das asas das fêmeas e no comprimento do corpo das larvas de C. sancticaroli. Recomendam-se o uso de técnicas biomoleculares para avaliar as respostas metabólicas dos organismos quando exposto à cafeína em baixas concentrações. / Caffeine is present in human daily life either as traditional coffee or constituent of medicines, stimulants, teas, chocolate, among other products. This substance is an emerging organic contaminant from untreated wastewater. Its presence in aquatic systems has been documented at low concentrations, from &eta;g.L-1 to &#181;g.L-1 and the effects of these concentrations on aquatic organisms have not yet been effectively investigated. In order to evaluate the toxic effects of caffeine, at concentrations usually found in aquatic systems, acute and chronic ecotoxicological tests were performed with Chironomus sancticaroli and Daphnia magna and, an intergenerational with C. sancticaroli, focusing on biological responses of mortality, immobility, growth, development and reproduction. As a result, caffeine did not present acute toxicity in the shor-term test performed for D. magna and C. sancticaroli. Chronic toxicity of caffeine was observed, with interference in the Chironomus larvae development, mainly in the concentration of 200 &#181;g.L-1, and in the growth and reproduction of D. magna, in which it was observed presence of induction in the production of neonates and deceleration to the development of the organism (delay in the process of ecdysis). In intergeneration test, changes in the larval developmental patterns were observed. In intergenerational testing, changes in larval developmental patterns were observed. The results demonstrate that caffeine, in concentrations detected environmentally, can cause small influences in the organism\'s life cycle of the, for example, changes in the size of the wings of the females and in the length of the body of the larvae of C. sancticaroli. The use of biomolecular techniques to evaluate the metabolic responses of organisms when exposed to caffeine at low concentrations is recommended.

O ferro é um elemento químico abundante e importante para os organismos. No ser humano, as reações redox do ferro são essenciais para a grande maioria das suas funções enzimáticas, mas fora dos compartimentos bioquímicos adequados pode se tornar uma toxina potencial para o organismo, já que pode catalisar a formação de espécies reativas de oxigênio (ROS). A sobrecarga de ferro pode se dar no sistema nervoso central. Várias evidências indicam que o estresse oxidativo é um dos fatores determinantes nas doenças neurodegenerativas como a Doença de Alzheimer (AD). AD é caracterizada pela acumulação de agregados de proteína &#946;-amilóide (A&#946;). Tem-se evidência de que o Fe participaria ativamente no processo de agregação dos A&#946;\'s e como gerador de radicais livres. A terapia de quelação é um tratamento convencional na sobrecarga do metal usando ligantes como a desferrioxamina (DFO). A cafeína por outro lado é uma xantina com atividade antioxidante. Estudos em modelos animais de AD indicam que a cafeína pode diminuir a produção de placas amilóides, bem como melhoria de aprendizagem e memória. Neste trabalho se sintetizou um ligante para o Fe baseado na DFO, a desferrioxamina-cafeína (DFCAF), que poderia ajudar a manter a homeostase normal do ferro cerebral. O DFCAF foi caracterizado por análise elementar, termogravimetria e métodos espectroscópicos (RMN, IR, Raman e UV/Vis). Foram avaliadas as propriedades de ligação do DFCAF com íons metálicos (Fe(III), Cu(II) e Mn(II)),onde a estequiometria metal:ligante sempre se manteve em 1:1. A atividade antioxidante do DFCAF foi avaliada frente ao sistema ferro/ascorbato, pelo método ORAC modificado, e por redução do radical DPPH. O DFCAF mostrou elevada afinidade por ferro em condições fisiológicas. Nos modelos pró-oxidantes dependentes de ferro,o DFCAF apresentou atividade antioxidante idêntica à do DFO. Tanto o ligante DFCAF livre quanto o complexo Fe(DFCAF) apresentaram permeabilidade em células HeLa, ao contrário do que se observou para DFO ou Fe(DFO). Foi possível observar que a conjugação da cafeína ao DFO produziu uma molécula nova, que preserva tanto as características de ligação do DFO quanto a estrutura da cafeína. Além disso, a presença de cafeína auxilia na permeabilidade celular de DFCAF, o que pode também ser um acréscimo de função na terapia de AD. / Iron is an abundant and important chemical element for organisms. In human beings, redox reactions of iron is essential to the vast majority of their enzymatic functions. However, outside suited biochemical compartments, iron may behave as a toxin, since it may catalyze the formation of reactive oxygen species (ROS). Iron overload may affect the central nervous system. Several evidences point to the role of iron in neurodegenerative conditions such as Alzheimer Disease (AD). AD is characterized by the accumulation of insoluble aggregates of the &#946;-amiloid protein (A&#946;), and iron may both actively induce the aggregation of A&#946; and generate free radicals. Chelation therapy is the frontline treatment for iron overload, employing ligands such as desferrioxamine (DFO). Caffeine is a xanthine with antioxidant activity. Studies with animal models of AD indicate that caffeine may decrease the rate of formation of A&#946;, as well as improve learning and memory. In this work, a ligand was synthesized incorporating the chelator moiety of DFO and the caffeine environment (DFCAF), which could help to maintain normal cerebral iron homeostasis. DFCAF was characterized by elemental analysis, thermal analysis and spectroscopic techniques. Binding of DFCAF with metal ions (Fe(III), Cu(II) and Mn(II)) occurred with a 1:1 metal:ligand stoichiometry. Antioxidant activity of DFCAF was assayed in the iron/ascorbate system, modified ORAC and reduction of DPPH radical. Whenever oxidation was iron-dependent, DFCAF displayed identical antioxidant activity as the parent DFO. Both free DFCAF and Fe(DFCAF) were permeable to HeLa cells. as opposed to the observed by DFO or Fe(DFO). It was possible to show that conjugation of caffeine to DFO lead to a new molecule which preserves both DFO binding properties and caffeine structure. The presence of the xanthine environment in DFCAF assists on its cell permeability, which can be of interest as an adjuvant on the therapy of AD.

Estudos sugerem que a cafeína atua sobre o osso promovendo aumento da excreção de cálcio e inibição da proliferação de osteoblastos, aumentando o risco de fraturas, osteoporose e doença periodontal. Os efeitos da cafeína sobre o tecido ósseo dificultam a aplicação de implantes dentários devido à presença de grandes defeitos ósseos ou volume ósseo insuficiente. Vários métodos são propostos para a regeneração de defeitos ósseos, entre eles, o uso de diferentes tipos de enxertos, os quais demonstram capacidade em promover a formação óssea A despeito das desvantagens, o osso autógeno ainda é considerado a referência padrão como enxerto ósseo, devido ao seu potencial osteogênico, osteoindutor e osteocondutor. A engenharia tecidual óssea tem sido utilizada como uma estratégia para a regeneração óssea. As células tronco mesenquimais são consideradas multipotentes e podem replicar como células indiferenciadas, possuindo potencial para se diferenciarem em linhagens de osso, cartilagem, gordura e cartilagem. O objetivo deste estudo foi quantificar histomorfometricamente a reparação óssea pelo enxerto de uma associação de osso autógeno obtido da calota craniana e células osteoblásticas em defeitos ósseos produzidos pela extração dental de ratos submetidos à administração diária de cafeína. Os animais foram divididos em: Controle (c), osso autógeno (oa) e osso autógeno + células osteoblásticas (oa+co) e receberam injeções diárias intraperitonealmente de 30 mg/kg/dia de cafeína durante trinta dias, os homólogos receberam de solução salina. Os ratos foram sacrificados nos períodos de 7, 21 e 42 dias pós-cirurgia e as amostras teciduais foram processadas para a obtenção de secções finas (5 m) e coradas com HE. Através de um sistema de análise de imagens se estimou a fração de volume de osso, conjuntivo e coágulo, no defeito ósseo. Os resultados histológicos e histométricos mostraram que nos animais sob tratamento com cafeína houve uma menor formação óssea estatisticamente significante a 1%, e um retardo na reabsorção do coágulo sanguíneo quando comparado aos alvéolos dos animais sob tratamento com soro fisiológico. A análise qualitativa do fragmento de osso autógeno isoladamente ou associado às células osteoblásticas mostrou uma osteointegração progressiva e sem reação de corpo estranho nos animais tratados com soro fisiológico e, as células implantadas não propiciaram reações imunogênicas nem a formação tumoral, possibilitando um aumento (25%) na reparação óssea dos animais tratados com a cafeína. Conclui-se que o enxerto/implante das células osteoblásticas associadas ao osso autógeno da calota craniana foi capaz de compensar, nos períodos tardios, os efeitos deletérios da cafeína na reparação óssea alveolar. / Studies suggest that caffeine acts on the bone for increasing the excretion of calcium and inhibition of osteoblasts proliferation, increasing the risk of fractures, osteoporosis and periodontal disease. The effects of caffeine on bone difficult the application of dental implants due to large bone defects and insufficient bone volume. Several methods are proposed for the regeneration of bone defects, including the use of different types of grafts, which show ability to promote bone formation. Despite the disadvantages, the autogenous bone is still considered the gold standard as bone graft because the potential osteogenic, osteoinductive and osteoconductive. The bone tissue engineering has been used as a strategy for bone regeneration. The mesenchymal stem cells are considered multipotent and can replicate as undifferentiated cells, with potential to differentiate into lineages of bone, cartilage, fat and cartilage. This study aimed to quantify histomorphometrycally bone repair by grafts of a combination of autogenous bone obtained from the skull and osteoblastic cells in bone defects produced by dental extraction in rats subjected to daily administration of caffeine. The animals were divided into: Control (c), autogenous bone (ab) and autogenous bone + osteoblastic cells (ab + oc) and received daily injections intraperitoneally of 30 mg/kg/day of caffeine for thirty days, the counterparts received saline solution. The rats were sacrificed at times of 7th, 21st and 42nd days post-surgery and tissue samples were processed to obtain thin sections (5 m) and stained with HE. Through an image analysis system was estimated the fraction of volume of bone, collagen and blood clot in the bone defect. The histological and histometric results showed that in animals under treatment with caffeine had a lower bone formation statistically significant at 1%, and a delay in the resorption of blood clots when compared to the alveoli of animals under treatment with saline. The qualitative analysis of the fragment of autogenous bone alone or associated with osteoblastic cells showed a progressive osteointegration and no foreign body reaction in animals treated with saline, and implanted the cells not provided immunogenic reactions or tumor formation, allowing an increase (25%) on bone repair in animals treated with caffeine. It was concluded that the graft/implant of osteoblastic cells associated with autogenous bone from the skull was able to compensate in later periods, the deleterious effects of caffeine on alveolar boné repair.