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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.
311

A influência da temperatura na condução de dois processos fermentativos para produção de cachaça / Influence of the temperature in the conduction of two fermentative processes for cachaça production

Vivian Santoro Braga 13 December 2006 (has links)
O presente trabalho teve como objetivo estudar o comportamento de três linhagens de leveduras, sendo duas da espécie S. cerevisiae, (Y-904 e CAT) e uma da espécie S. bayanus, (EC) em duas temperaturas de fermentação 20 e 32 °C, usando dois meios, YEPD (meio controle) e caldo de cana-de-açúcar clarificado. As fermentações foram realizadas em câmara de BOD, estático, em frascos de erlenmeyer, com 200 mL de meio e 1 g de fermento seco. A concentração de açúcar foi padronizada para 150,0 g L-1 de ART (açúcares redutores totais) e 15,2 °brix, nos ensaios que se utilizou o caldo de cana como substrato. As fermentações que se utilizou apenas o caldo de cana foram realizadas em balões de cinco litros, em ambas as temperaturas, nas quais as três linhagens de levedura foram avaliadas, através da análise cromatográfica do destilado. Para a obtenção dos destilados foi montado em laboratório um destilador feito totalmente de vidro. Nos ensaios que se utilizou o meio controle e o caldo de cana nas duas temperaturas de fermentação, as leveduras foram avaliadas quanto ao crescimento celular, o açúcar residual e o teor alcoólico. As amostras dos destilados provenientes das fermentações que utilizaram apenas o caldo de cana como mosto, foram avaliadas quanto: ésteres, aldeídos, acidez volátil, álcoois superiores, álcool metílico, furfural, carbamato de etila, acroleína e cobre. As três linhagens ensaiadas apresentaram diferenças estatísticas entre si e entre os meios utilizados. O objetivo não foi a comparação entre as duas temperaturas e sim avaliar o comportamento das linhagens e verificar a possibilidade de se efetuar fermentações a 20 e a 32 °C. Pela análise cromatográfica alguns componentes voláteis como ésteres, aldeídos, acidez volátil, álcoois superiores e álcool metílico, apresentaram diferenças estatísticas, isto é, a formação desses compostos foi influenciada pela temperatura e pelas linhagens utilizadas. O teor de ésteres aumentou com o decréscimo da temperatura para S. bayanus. A acidez volátil aumentou com o acréscimo da temperatura, assim como ocorreu com a formação de álcoois superiores e de álcool metílico que foi mais elevada a 32 °C do que a 20 °C. Enquanto que outros componentes como: furfural, carbamato de etila, acroleína e cobre não apresentaram diferenças em relação a variação da temperatura ou pelas leveduras utilizadas. / The present work had the aim of studying the behavior of three yeast strains, considering two from Saccharomyces cerevisiae species (Y-904 and CAT) and one from Saccharomyces bayanus species (EC), in two fermentation temperatures, 20 and 32 C, utilizing two mediums, YEPD (control medium) and clarified sugarcane juice. The fermentations were carried out in stable BOD chambers, in bottles of Erlenmeyer, with 200 mL of each medium and 1 g of dried yeast. The sugarcane concentration was standardized to 150g/L of ART (total reductor sugar) and to 15,2 °brix in the essay that was used the sugarcane juice as medium. The fermentations that were used only the sugarcane juice were carried out into 5 liters balloons capacity, in both temperatures, where the three yeasts strains were evaluated through chromatography analysis of the distillates. In order to obtain the distillates, it was built a all-glass distillation apparatus. The yeasts were analyzed as the cell growth, the residual sugar and the alcoholic concentration at the essays which were used the control medium and the sugar cane juice in both temperatures. It was evaluated esters, aldehydes, acidity, higher alcohols, methyl alcohol, furfural, acrolein and copper in the distillates samples which came from the fermentations that used only the sugarcane juice as wort. The three yeast strains showed differences between each other and between the mediums. The aim of this study was not to compare the results between the temperatures, but it was to evaluate the behavior of the strains and find out the possibility of making fermentations at 20 and 32°C. The chromatography analysis showed statistical differences from volatile compounds as: esters, aldehydes, acidity, higher alcohols and methyl alcohol. These results show that the formation of these compounds was influenced by temperature and by the yeats strains used. The content of esters increased when temperature decreased for S. bayanus. The acidity increased when the temperature also increased, the same occurred with higher alcohol formation and methyl alcohol formation. The methyl alcohol formation was higher at 32 C than 20 °C. The others compounds as: furfural, ethyl carbamate, acrolein and copper did not show differences related to the temperature variation and the yeasts strains used.
312

The effect of diet drinks on oral health among US children and adults: cluster analysis

Samman, Meyassara 24 October 2018 (has links)
INTRODUCTION: Dental caries erosion are both multifactorial diseases. One common factor for both diseases is acid attack on dental enamel. Some beverages contain both erosive acids and cariogenic carbohydrates, thus, promoting both types of disease. Previous literature has examined beverages as single source exposures, despite the fact that beverage consumption is a complex process that contains several beverage. A few studies have examined the patterns of beverage consumption and dental caries in both children and adults. These studies found a significant positive relationship between sugar sweetened beverages consumption and caries. These studies did not differentiate between regular and diet soda, so the relationship between diet/low calorie sweetener drinks and dental caries is not established. In contrast with caries, the association between beverage consumption patterns and erosion has not been studied before. OBJECTIVES: Examine the effect of diet drinks on dental caries and erosion among a representative sample of US children and adults. METHODS: All analyses conducted using cluster analysis to account for the complexity of beverage consumption and to better understand the effect of different consumption patterns on the dentition. NHANES data was used to be able to generalize the results to the US population. RESULTS: In children, we managed to define 6 different clusters including: water, milk, juice drinks, 100% juice, soda, and diet drinks. None of the clusters demonstrated statistically significant associations with dental caries. While individuals with high soda consumption had the highest caries risk, diet drinks had no effect on dental caries. On the other hand, adults were grouped into 4 distinct clusters: water, soda, diet drinks, and coffee/tea. The diet drinks cluster was not associated with higher DMFT score, while high soda consumption demonstrated increased DMFT. In contrast, high diet drinks consumption increased the risk for erosion, although this relationship was not statistically significant. CONCLUSION: This dissertation showed that diet drinks are not associated with dental disease. While we can not recommend consuming these drinks based on this one cross sectional study, we believe that more studies should be conducted so that we can draw a final conclusion regarding oral disease and diet drinks. / 2022-10-24T00:00:00Z
313

Alcohol abuse amongst the youth in Musina Town

Mafa, Prudence January 2019 (has links)
Thesis (M.A.(Social Work)) -- University of Limpopo, 2019 / Alcohol consumption by young people continues to be a social problem that is associated with major health complications later in life. More youth engage in alcohol consumption frequently with a decreasing age of debut. The current study aimed at exploring and describing the prevalence, patterns and context of youth alcohol consumption in Musina Town, Limpopo Province. A convergence mixed method was employed. This was complemented by an exploratory-descriptive design. Using random stratified and purposive sampling techniques, data was collected from grade 11 learners by way of a survey and a focus group discussion. Data collected from the study show that there is a high prevalence of alcohol use amongst the youth in Musina as almost two thirds (61%) of the survey participants reported to be current alcohol users. Patterns of consumption include drinking during weekends and holidays with binge drinking and drinking until drunkenness being the main forms of alcohol consumption. There was no difference in binge drinking between male and female alcohol drinkers, with 22% of each gender reporting to consume more than five drinks a session. Contexts of alcohol consumption by the youth include drinking at various social gatherings, school, at home, unlicensed liquor outlets, drinking to have fun or as a coping mechanism. Young alcohol consumers have little to no concern about their drinking behaviour, which is exacerbated by alcohol drinking permissive culture and the availability of alcohol. Keywords: Youth, Alcohol consumption, Prevalence, Patterns, Availability
314

Effects of televised alcohol advertisements on the drinking behaviour of youth:a case study of Praktiseer community in Greater Tubatse Municipality

Mapulane, Mawethu Glemar January 2014 (has links)
Thesis (M.A. (Media Studies)) --University of Limpopo, 2014. / This study investigates the effects of televised alcohol advertisements on the drinking behaviour of youth in Praktiseer community of the Greater Tubatse Municipality. The nature and trends of alcohol consumption in South Africa are examined. The study also focuses on the impact of alcohol exposure, and the costs alcohol abuse can incur on the individual and society at large. The types of advertising models and the regulatory systems in advertising were identified. Data were collected through a self- administered questionnaire. The study hypothesised that the exposure to alcohol advertisements influences alcohol abuse among the youth. However, alcohol industry claims that the youth is not its niche market and hence should not be blamed for any abusive behaviour of alcohol by the youth. Just like the few studies interested in the effects of alcohol advertising, alcohol exposure and alcohol abuse, the present study also reveals that televised alcohol advertisements have a great influence in alcohol consumption among the youth in Praktiseer community.
315

PowerHab – Energía de la dulce naturaleza / PowerHab - Energy of Sweet Nature

Aymara León, Carlos Leónidas, Jiménez Vilcayauri, Kevin Félix, Rodríguez Solis, Ximena Haydeé 21 July 2020 (has links)
El siguiente proyecto se basa en la elaboración de un ponche de habas con cascara de cacao y panela, los cuales son ingredientes con altos valores nutricionales para acompañar un desayuno o una lonchera saludable para los niños y niñas de 4 a 15 años en su etapa de desarrollo. Asimismo, este producto fue diseñado para combatir la falta de tiempo que suelen tener los padres de familia por temas de trabajo u otra actividad y será distribuido en Lima Metropolitana. Nuestro proyecto de negocio consiste en la venta de una bebida nutritiva de fácil acceso para nuestro público objetivo, los canales que se utilizaran son el online y las bodegas. Asimismo, el producto se ofrecerá en una presentación de 350 ml con un precio económico de 5.00 soles. Finalmente, en el presente trabajo se explicará el modelo y plan de negocio utilizado, el concierge realizado, el plan de operaciones, recursos humanos, marketing, responsabilidad social empresarial, financiero y el aprendizaje que hemos obtenido en todo el transcurso del proyecto. / The following project is based on the preparation of a bean punch with cocoa husk and panela, which are ingredients with high nutritional values to accompany a healthy breakfast or lunch box for children from 4 to 15 years old in their developmental stage. Also, this product was designed to combat the lack of time that parents usually have due to work or other activities and will be distributed in Metropolitan Lima. Our business project consists of the sale of a nutritious drink that is easily accessible to our target audience. The channels that will be used are the online and the store. Likewise, the product will be offered in a 350 ml presentation with an economic price of 5.00 soles. Finally, this work will explain the business model and plan used, the concierge made, the operations plan, human resources, marketing, corporate social responsibility, financial and learning that we have obtained throughout the project. / Trabajo de investigación
316

Drink Specials, Drink Special Laws, and Fatal Motor Vehicle Crashes in the United States

Puac-Polanco, Victor David January 2020 (has links)
The adverse health and safety consequences of excessive alcohol consumption are a leading problem around the world. Alcoholic beverages are a routine part of socializing in many societies. However, alcohol is also a significant contributor to worldwide morbidity, disability, and mortality. To lessen the harm produced by alcohol, governments have adopted different alcohol control policies. These control policies can be group into four basic strategies: deterrence, prevention, communications and outreach, and alcohol treatment. Among the prevention measures, restricting physical access to alcohol by limiting the alcohol outlets' density, raising the legal age to purchase alcohol, and reducing the affordability of alcohol through taxation have been extensively shown as cost-effective and feasible measures against alcohol-related harms. However, there are still topics related to the affordability of alcohol that have not been investigated. The role of promotional price practices at on-premises alcohol outlets on health and social outcomes, and the effects of policies enacted to prevent these practices on motor vehicle crashes remained an unexplored research topic. The main goals of this dissertation were to summarize evidence regarding the health effects of drink specials and to estimate the effects of policies restricting drink special practices as preventive tools for fatal motor vehicle crashes. Specifically, I summarized the research evidence of the effects of drink special practices on health and social outcomes (Aim 1). I examined the association between drink special laws and alcohol-related fatal motor vehicle crashes contrasting results for two methodological approaches, difference-in-difference-in-differences (Aim 2) and synthetic controls (Aim 3). This dissertation contains five chapters. The introduction in chapter one provides a background review of relevant literature that serves as the conceptual framework for this dissertation and an overview of chapters two, three, four, and five. The systematic review of the literature relevant to Aim 1 is presented in chapter two. This review included studies on the effects that drink specials and drink special laws have on alcohol consumption, binge drinking, and alcohol-related harms. Twelve studies examined the effect of drink specials in seven countries between 1978 and 2018. Consistent evidence supported associations between drink specials and increased alcohol consumption, heavy drinking, alcohol intoxication, and other alcohol-related outcomes. For aims 2 and 3, I examined 36-years of data from the U.S. Department of Transportation, Census Bureau, and NIH’s Alcohol Policy Information System and National Institute on Alcohol Abuse and Alcoholism from 1982 to 2017. In chapter three, I presented results from difference-in-difference-in-differences analyses of the effects of implementing six drink special laws on alcohol- and non-alcohol-related motor vehicle fatal crash rates in the United States (U.S.). I assessed exposure to implementation as any law, number of laws, and each law. Random effects generalized least squares regression models adjusted for the proportion of males in the state, youth involved in fatal crashes, gallons of ethanol per capita among the population age 21 years and older, and autonomy index were fitted across 24 treated and 18 non-treated states. Results revealed that the implementation of any drink special law was associated with reductions in overall and alcohol-related fatal crash rates compared to untreated states. Also, drink special laws mitigated incremental rates of non-alcohol related crashes among treated states with any drink special law compared to untreated states. In chapter four, I presented results from synthetic control analyses for single and multiple treated units. I assessed the association between drink special laws and alcohol-related fatal motor vehicle crashes and adjusted for the same covariates as in chapter three. Results in chapter four indicated that states treated with any drink special law reduced alcohol-related fatal crash rates only in years three, five, and ten post-implementation compared to the synthetic control trend. The effects of any drink special law were more consistent at different times in the post-implementation for reducing non-alcohol-related fatal crash rates than the synthetic control trend. Findings for the number of laws implemented and each drink special laws were mixed. Chapter five presents a synthesis and discussion of findings in chapters two, three, and four, as well as policy recommendations for stakeholders and future research.
317

Dietary and Health Correlates of Sweetened Beverage Intake: Sources of Variability in WWEIA/NHANES

Gabrielle Riley Bonanno (12126753) 18 April 2022 (has links)
<div> <div> <div> <p>Recent studies using data from the National Health and Nutrition Examination Survey (NHANES) have used inconsistent approaches to identify and categorize beverages, especially those containing low-calorie sweeteners (LCS), also referred to as low-calorie sweetened beverages (LCSB). Herein, we investigate the approaches used to identify and categorize LCSB in recent analyses of NHANES data. We reviewed published studies examining LCS consumption in relation to dietary and health outcomes and extracted the methods used to categorize LCS as reported by the authors of each study. We then examined the extent to which these approaches reliability identified LCSBs using the Internet Archive Wayback Machine to examine beverage ingredients lists across 3 NHANES cycles (2011-2016). None of the four general strategies appeared to include all LCSB while also excluding all beverages that did not contain LCS. In some cases, the type of sweetener in the beverage consumed could not be clearly determined; we found 9, 16, and 18 of such “mixed” beverage identifiers in 2011-12, 2013-14, and 2015-15, respectively. Then, to illustrate how heterogeneity in beverage categorization may impact the outcomes of published analyses, we compared results of a previously published analysis with outcomes when “mixed” beverages were grouped either all as LCSB or all as sugary beverages. Our results suggest that caution is warranted in design and interpretation of studies using NHANES data to examine dietary and health correlates of sweetened beverage intake. </p> </div> </div> </div>
318

Šetření aktuálního stavu ekologického zemědělství v Kraji Vysočina se zaměřením na Třebíčsko

Macková, Martina January 2017 (has links)
Diploma thesis deals with the state of organic farming in the Vysočina Region, with focus on Třebíč district. The theoretical part includes principles of organic farming, current legislation, the problem of organic food and control system. It also describes the state of organic farming in the Czech Republic and in the Vysočina Region. Natural conditions and agricultural production are also mentioned. Another part is focused on comparison of organic agriculture in individual districts, which constitute Vysočina Region. The practical part deals with comparison of typical activities in the Třebíč district with other districts and describes important subjects. The last part is a questionnaire survey focused on two companies, organic farm DoRa and Tata Global Beverages Czech Republic. The conclusion constists of a summary of detected realities.
319

The attitudes of adolescents, parents and grandparents towards adolescent problems in a rapidly changing society

Nyembe, Boy Timothy January 1988 (has links)
A Dissertation submitted to the Faculty of Arts, UNIVERSITY OF ZULULAND In partial fulfilment for the degree MASTER OF ARTS IN CLINICAL PSYCHOLOGY in the Department of Psychology, 1988. / The researcher's aim in this study was to identify and compare the attitudes of adolescents, parents and grandparents towards three adolescent problem variables. The researcher's point of departure was to review relevant literature on the generation gap phenomenon, adolescent premarital sexual relations, delinquent behaviour and the use of alcoholic beverages. A. Likert-type scale was constructed to measure the attitudes of adolescents, parents and grandparents towards adolescent premarital sexual relations) delinquent behaviour and use of alcoholic beverages. Three samples comprising 30 adolescents, 30 parents and 30 grandparents were randomly selected from the seven wards/ sections of the 42 Hill Location, Harrismith. Respondents were from the Zulu, South-Sotho, Tswana .and Xhosa ethnic groups. Illiterate and educated subjects were included in the study. The t-test and Chi-Square (ifi test results highlighted significant differences between the attitudes of adolescents and parents towards premarital sexual relations. The differences between the attitudes of adolescents and those of grandparents towards this variable were also significant:. The attitudes of parents and grandparents towards premarital sexual relations were not significantly different. These findings tended to support previous research studies which stated that parents and grandparents were traditionally more conservative in their attitude towards sexuality than were adolescents. Modern adolescents who lived in a society where sex was discussed more openly seemed to feel that they should engage in premarital sexual relations. It seemed the generation gap between adolescents and parents,and to a greater extent between adolescent and grandparent, had increased. Results indicated insignificant differences between the attitudes of adolescents, parents and grandparents towards adolescent delinquent behaviour. All three generations seemed to agree that modern adolescents acquired much information from their friends. In a modern rapidly changing South African society, traditional authority seemed to have lost most of its impact on the adolescent's bahaviour. Adolescents seemed to believe that parents had failed to change the socio¬political situation hence they had to take the lead. Parents themselves seemed to be puzzled and confused by the rapidly changing, contemporary, technocratic and violently divided society. Significant differences between the adolescent and parent attitudes and between adolescent and grandparent attitudes towards adolescent use of alcoholic beverages were indicated in this study. The insignificant differences between the attitudes of parents and grandparents towards this variable seemed to indicate that parents and grandparents were against adolescent use of alcoholic beverages. On the other hand, adolescents seemed to feel that they should indulge in drinking alcoholic beverages. In the modern South African society, adolescents saw liquor advertised on television and in literature and thus indulged in drinking alcoholic beverages. It was recommended that whatever the desired politico-social change, both parents and adolescents could be made aware that communication and dialogue between them are a sine-qua-non towards the solution and alleviation of their problems. Parents may be motivated to discuss with adolescents their views and feelings about premarital sexual relations and vice versa. The dialogue could be encouraged in public meetings, seminars, on television and radio. Parents could be encouraged to listen to the views of adolescents in order to guide them. Parents may be made to accept the fact that adolescents live during a time and in a society where they may express both their positive and negative opinions regarding certain issues. Community programmes such as therapeutic groups, youth clubs and recreation clubs could provide adolescents with an opportunity of expressing their views, developing their social skills and improving relationships with others. Information concerning problems that are associated with the use of alcoholic beverages could be made available to adolescents during the discussions and advertisements. The aim could be to assist adolescents to cope with problems and to feel happy without indulging in drinking alcoholic beverages.
320

Understanding adolescents' beliefs about sugar-sweetened beverages using the Theory of Planned Behavior

St. John, Mallary Nichole 24 October 2019 (has links)
No description available.

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