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Search Results: 1 - 10 of 401325 matches for " Míriam Goldfarb "
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4) Criogenic storage of seeds of physic nut (Jatropha curcas L.) Euphorbiaceae
Míriam Goldfarb,Maria Elita Martins Duarte,Mário Eduardo R. M. Cavalcanti Mata
Biotemas , 2010,
Abstract: The aim of the present study was to evaluate the physiological quality of seeds of physic nut during cryogenic storage at -196oC (liquid nitrogen) and -170oC (vapor of nitrogen) for periods of 0, 30, 60 and 90 days. The seeds were stored in cryogenic containers filled with liquid and vaporized nitrogen. Evaluation parameters were the seed germination and the plantlet vigor 14 days after sowing. The statistical delineation was completely randomized. A factorial analysis between two temperatures (-170oC and -196oC) and four cryopreservation periods (0, 30, 60 and 90 days) was employed. Four repetitions of fifty seeds per treatment were used. Data were submitted to variance analysis and the means were compared by Tukey’s test at 5% of probability. We concluded that cryopreserved seeds maintained their viability after cryogenic storage and satisfactory vigor indices were obtained after the cryogenic treatments, showing that seeds of the physic nut can be stored under cryogenic temperatures.
Kinetic of Cryogenic Freezing of Seeds of Physic Nut (Jatropha curcas L.)
Míriam Goldfarb,Maria Elita Martins Duarte,Lívia Wanderley Pimentel,Liv Soares Severino
Engenharia Ambiental : Pesquisa e Tecnologia , 2010,
Abstract: The physic nut is an oils species, the oil extracted of the seeds has been used for biodiesel production. The cryoconservation consists of an option of storage of the seeds this species, cryogenic temperatures will to provide the reduction of the metabolism, resulting in the conservation. The objectives of this work was to determine the curve of freezing of the seeds in the cryogenic temperatures of -170oC (nitrogen vapor) and -196oC (liquid nitrogen). The seeds with water content of 8% b.u., were exposed the cryogenic temperatures, were made evalutions in intervals of 5 seconds until reach the temperature of equilibrium. The results were for the temperature of -170oC, the time to reach the temperature of equilibrium was 220 seconds and for the temperature of -196oC, the time to occur the freezing was 200 seconds. About thermal diffusivity of seeds at -170oC was 2,10443 x 10-3 mm2.s-1 and when were immersed in liquid nitrogen, the thermal diffusivity was 3,25787 x 10-3 mm2.s-1. The freezing curves were exponential and the three freezing phases were not distinguished. Conclusion that: as much bigger is the thermal gradient that the seeds were exposed, bigger was the values of the freezing speed and thermal diffusivity.
Fertilization and water availability over cotton growth and fruiting stages to CV. Fibermax FM 966.
Rosiane de Lourdes Silva de Lima,Gilvan Barbosa Ferreira,Valdinei Sofiatti,Míriam Goldfarb
Engenharia Ambiental : Pesquisa e Tecnologia , 2009,
Abstract: ABSTRACTThe correct management of water and nutrients in cotton plants is very important to achieve high yield. Therefore, it is necessary to know in which conditions foliar fertilizers can complement soil fertilization as well as the influence of soil moisture. The objective of this work was to evaluate the effects of mineral fertilization by soil and leaves in two irrigation levels over the vegetative and reproductive characteristics of cotton plant. It was used a Randomized Block Design with 4 replications. The treatments were arranged in factorial scheme 3 x 2 x 2 with three doses of N, P and K (0, 100 and 200 kg.ha-1), counting on presence or absence of foliar fertilizer and two irrigation levels (replacement of 70 and 100% of field capacity - CC). At 90 days after planting, were measured growth variables and at 120 days the production variables. The cotton soil fertilization with up to 200 kg. ha-1 of NPK provided greater plant growth and increased cotton yield. Foliar fertilizer with macronutrients did not change the plant growth and cotton yield. The enlargement of available water in the soil from 70 to 100% of field capacity caused high plant growth, but did not modify the cotton yield.
Incidence of fungus and physiological quality of seeds of Jatropha curcas L. after cryogenic storage
Míriam Goldfarb,Maria Elita Martins Duarte,Mário Eduardo R. M. Cavalcanti Mata,Luciana Cordeiro do Nascimento
Biotemas , 2010,
Abstract: The objective of this work was to evaluate the incidence of fungi in stored seeds of Jatropha curcas. The research was carried out at Cryogenic/UFCG, Sanity/UFPB and Cotton/Embrapa. The material for analysis showed an 8% water level, and 200 seeds were stored for treatment in cryogenic containers with nitrogen in the vapor and liquid phases. Four periods of crioconservation (0, 30, 60 and 90 days), were employed. After each period, the seeds were tested for sanity (Blotter test) and germination. Superficial disinfestation, was carried out and seeds were distributed in Petri dishes, for incubation at 25 ± 2oC, over a period of 7 days. The evaluation of the incidence of fungi was carried out in a stereoscopic microscope with observation of fungal structures, and values were expressed as percentages of seeds with fungus. The statistical experiment was completely randomized with temperature x days of storage. Analysis of variance was conducted and the means were compared by Tukey’s test at 5%. After 30 days of cryogenic storage, a greater incidence of Aspergillus sp., Cladosporium sp. and Fusarium sp. was detected. It was concluded that crioconservation at cryogenic temperatures did not reduce the incidence of fungus on Jatropha curcas seeds. The physiological quality was preserved during the cryoconservation.
Com um lápis e um papel ... cria-se um novo texto: as representa??es de práticas democráticas nos colégios de aplica??o
Kaiuca, Míriam Abduche;
Ensaio: Avalia??o e Políticas Públicas em Educa??o , 2004, DOI: 10.1590/S0104-40362004000400007
Abstract: this article has the intention of study in the social representations that the teachers of the lower school of the colégio de aplica??o build over the democratic public school having as its research field the colégio de aplica??o of the federal university of rio de janeiro and the colégio de aplica??o of the state university of rio de janeiro. the main objective of the present study was to capture the dynamics of the representation construction of a democratic school, and at the same time to search for its historical and ideological motivations and the changes it suffered along the time; and also to understand the values, the rules, the behavior, the symbols and the resistances of the lower school teachers towards the democratization process of the contemporary pedagogical practices. the lower school teachers representations about the democratic school follow the present education project that is being developed at the caps or the one that has been already applied in another historical moment. this project in itself becomes the reference of the public, democratic and the quality school. in the crossing of the speeches were born the analytical categories: alterity, power and resistance. it was concluded that the democratic education could not be based on any notion of non-history and transcendental truth or authority. the school democracy is a tension process born by the power relationship within the institution. among the investigated group, were encountered representations that maintain the caps' original selective and elitization function, and therefore reinforce the social exclusion; other representations defend a differentiated formation in line with the cap student original social class and a third group that reinforces the possibility of the implementation of an educational project that advances in the direction of the introduction and recognition of the lower class students into the school activities and daily life.
Paradoxos da identidade: a política de orienta??o sexual no século XX
Adelman, Míriam;
Revista de Sociologia e Política , 2000, DOI: 10.1590/S0104-44782000000100009
Abstract: this article works from the perspective of social constructivism on sexuality with the aim of discussing the emergence of modern "sexual identities". i identify, on the one hand, the "invention" of homosexuality (and, consequently, of heterosexuality) in the discursive production of victorian society. on the other hand, i discuss the form in which this new category becomes the basis of a political strife that vindicates sexual diversity, focusing mainly on the evolution of sexual orientation politics in 20th. century north american society.
Vis?es sobre o trabalho em transforma??o
Toni, Míriam de;
Sociologias , 2003, DOI: 10.1590/S1517-45222003000100009
Abstract: in this article, the changes that have marked our societies after the crisis and restructuring of capitalism since the last decades of the 20th century are seen as having had great impact over labor relations, disarraying the relations that have shaped the welfare state and reordering them under market regulation. considering the central role assigned to work in our societies, it becomes relevant to discuss different interpretations of emergent phenomena in the world of labor - from approaches that point to "the end of work" to those that argue its sustained centrality - reflecting over their social implications. it is underlined that the speedy process of current technological diffusion has been making labor relations precarious, broadening insecurities and vulnerabilities, and becoming a crucial source of social inequality. the article is closed with reflections over the development of the world of labor, postulating a critical view regarding extreme positions about the subject and underlining the unfavorable repercussions entailed by the changes under way, in order to advert to undesired social outcomes.
Vis es sobre o trabalho em transforma o
Toni Míriam de
Sociologias , 2003,
Abstract: No artigo, considera-se que as transforma es que têm marcado nossas sociedades a partir da crise e reestrutura o do capitalismo desde as últimas décadas do século XX repercutem fortemente sobre as rela es de trabalho, desordenando as rela es que conformaram o Estado de Bem-Estar Social e reordenando-as sob a égide da regula o pelo mercado. Considerando o papel central atribuído ao trabalho em nossas sociedades, torna-se relevante discutir as diferentes interpreta es sobre os fen menos emergentes no mundo do trabalho - desde enfoques que apontam para o "fim do trabalho" até os que defendem a permanência da centralidade do trabalho -, refletindo sobre suas implica es sociais. Ressalta-se que o processo veloz de difus o tecnológica em voga vem precarizando as rela es de trabalho, ampliando inseguran as e vulnerabilidades e sendo fonte crucial de desigualdade social. Encerra-se o artigo com reflex es sobre o evolver do mundo do trabalho, propondo um olhar crítico a posi es extremadas sobre o tema e ressaltando as repercuss es desfavoráveis acarretadas pelas muta es em curso, no sentido de advertir sobre conseqüências sociais n o desejadas.
Paradoxos da identidade: a política de orienta o sexual no século XX
Adelman Míriam
Revista de Sociologia e Política , 2000,
Abstract: Trabalhando com a perspectiva do construcionismo social sobre a sexualidade, este artigo tem por objetivo problematizar o surgimento das identidades sexuais modernas. Identifico, por um lado, a "inven o" da homossexualidade (e, portanto, da heterossexualidade) na produ o discursiva da sociedade vitoriana. Por outro lado, discuto a forma em que essa nova categoria torna-se base de uma luta política que reivindica a diversidade sexual, enfocando principalmente a evolu o de políticas de orienta o sexual na sociedade norte-americana do século XX.
Homologias entre a organiza o do espa o, rela o entre colegas, com a clientela e com a lei em uma delegacia de mulheres
Vieira, Míriam Steffen
Civitas , 2008,
Abstract: Este paper está referenciado numa etnografia da delegacia da mulher de Porto Alegre (2004-2006) e tem por objetivo analisar as concep es de agentes policiais sobre o trabalho que realizam. Primeiramente, apresenta as no es que embassam o projeto político que originou as delegacias de mulheres e as nuan as a partir das práticas de atendimento policial. Posteriormente, correlaciona diversos aspectos que integram este universo - organiza o do espa o, proximidade com a clientela e sua demanda, prestígio das fun es e concep es de direito - para desenvolver o argumento da existência de uma hierarquia interna transposta na organiza o do espa o e também no processo de constru o de categorias jurídicas no campo dos direitos das mulheres.
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