Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains iii, 50 p. : ill. Includes abstract. Includes bibliographical references (p. 43-50).

Thesis--Catholic University of America. / Reprinted from Transactions of the American Microscopical Society, v. 78, no. 2-3, 1959.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1957. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M. Phil.)--University of Hong Kong, 2005. / Title proper from title frame. Also available in printed format.

Thesis (M.S.)--University of Wisconsin--Madison, 1970. / Typescript eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 62-74)

Resumo: Três experimentos foram conduzidos com linhagens comerciais de frangos de corte em baterias metálicas para determinar a biodisponibilidade relativa de duas fontes de grupamentos metílicos (metionina e betaína). A dieta basal (controle) foi formulada com milho e farelo de soja, contendo 1.896, 1.969 e 2.010 mg/kg de colina no experimento I, II e III, respectivamente. Os níveis suplementados em betaína e metionina foram isomolar. O experimento I (fêmeas até 21 dias de idade) constou de seis níveis de metionina (0; 5,36; 10,72; 16,08; 21,45; 32,17 mMol/kg) e dois níveis de betaína (0 e 5.36 mMol/kg). No experimento II (machos até 21 dias de idade) a dieta controle foi suplementada com 0; 2,68; 5,36; 8,04; 10,72; 13,40 mMol/kg de metionina ou 0; 2,68; 5,36; 8,04; 10,72; 13,40 mMol/kg de betaína. Em relação ao experimento III (machos até 21 anos de idade) houve quatro níveis de metionina (0; 8,04; 10,72 e 13,40 mMol) e três níveis de betaína (0; 6,7 e 13,4 mMol). Para o experimento I e III foram utilizados quatro repetições de oito aves para cada tratamento. O experimento II apresentou quatro repetições para cada tratamento e oito repetições para o grupo controle, apresentando também oito aves por parcela experimental. Foi constatado para os experimentos I, II e III que os valores de inclinação da curva pra a betaína e metionina foram significativos para o peso corporal e conversão alimentar. No experimento III somente o valor de inclinação para a curva da metionina foi significativo, em relação ao consumo alimentar. No experimento III somente o valor de inclinação para a curva da metionina foi significativo, em relação ao consumo alimentar. Nem a metionina ou a betaína diminuíram a gordura abdominal em nenhum dos experimentos. Em média, os dados do experimento II e III indicaram que a biodisponibilidade relativa... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Three experiments were conducted with commercial strain chickens in battery brooders to determine the relative bioavailability of the two methyl sources (methionine and betaine). For basal corn and soybean mean based died contained 1,896, 1,969 and 2,010 mg/kg choline in Experiment I, II and III, respectively. Betaine and methionine supplements were isomolar. In Eexperiment I (females for 21 days) there were 6 levels of methionine (0; 5.36; 10.72; 16.08; 21.45; 32.17 mMol/kg) and two levels of betaine (0 and 5.36 mMol/kg). In Experiment II (male for 21 days) the control diets were supplemented with 0; 2.68; 5.36; 8.04; 10.72; 13.40 mMol / kg methionine or 0; 2.68; 5.36; 8.04; 10.72; 13.40 mMol/kg betaine. In Experiment III (male 21 days) there were 4 levels of methionine (0; 8.04; 10.72 and 13.40 mMol) and three levels of betaine (0; 6.7 and 13.4 mMol) .There were four replicate pens with eight chicks per each treatment in Experiment I and III. There were four replicates per each treatment and eight replicates pens for the control group in Experiment II. In Experiment I, II and III, the slope values for betaine and methionine were significant on body weight gain and feed conversion. In Experiment III, only for methionine, the slope values were significant on feed consumed. Neither methionine nor betaine decreased abdominal fat pad in anyone experiment. On average, the data the experiment II and III indicate that the relative... (Complete abstract click electronic access below)

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Methionine sulfoxide reductase (MSR) is an important antioxidant to help mitigate oxidative stress that contributes to age-associated neurodegenerative diseases, such as Alzheimer’s Disease and Parkinson’s Disease. In MSR deficient Drosophila melanogaster (fruit flies), larvae show a developmental delay like that seen when wild-type larvae are reared on nutrient deficit culture medium. These investigators further showed that serotonin levels were depressed in these nutrient deficient larvae. The overarching aim of this study was to better understand the role of serotonin in MSR regulated physiology. Supplementing food with serotonin partially rescued the slower mouth hook movements (MHM) observed in the MSR-deficient flies. However, supplementation with serotonin altering drugs that cross the blood brain barrier (5-hydroxytryptophan, fluoxetine, or paravi chlorophenylalanine) did not rescue MHM and caused impairments to the growth of larvae during development. This study indicates that serotonin regulates feeding behavior partially through the regulation of MSR production but acts independently to regulate development. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2021. / FAU Electronic Theses and Dissertations Collection

Rats fed diets which contained 15% of casein and 0.620% of methionine with 0.0002, 0.02 and 0.42% of dietary inorganic sulfate had a dietary sulfate-related change in methionine metabolism. Rats fed the diets low in sulfate (0.0002%) had a 35% increase in methionine metabolism compared to rats fed the diets high in sulfate (0.42%). In contrast, rats fed the diet low in sulfate (0.0002%) had the lowest level of tissue S-adenosyl-methionine and the highest activity of phenylethanolamine-N-methyltransferase activity. Those animals fed the diet normal with respect to sulfate (0.02%) had intermediate levels of S-adenosylmethionine and phenylethanolamine-N-methyl transferase activity. Rats fed the diet high in sulfate (0.42%) had the highest level of tissue S-adenosyl-methionine and the lowest phenylethanol-amine-N-methyl transferase activity. Due to the inverse relationship between S-adenosylmethionine and phenylethanolamine-N-methyl transferase activity, it appears that the catecholamines may function as a methyl sink for the increase in the metabolism of methionine required to provide sulfate for rats fed diets low in sulfate.