Página 1 dos resultados de 49994 itens digitais encontrados em 0.036 segundos

Avaliação de linhagens de arroz (Oryza sativaL.) suscetíveis e tolerantes a baixas temperaturas em cruzamentos dialélicos parciais; Evaluation of cold tolerant and cold susceptible rice inbred lines (Oryza sativa L.) in partial diallel crosses

Torres Toro, Edgar Alonso
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/09/2006 PT
Relevância na Pesquisa
36.44%
A obtenção de cultivares de arroz de alta produtividade e com tolerância a baixas temperaturas para a zona temperada da América Latina é um dos mais importantes desafios para a agricultura local. Neste trabalho buscou-se estimar parâmetros genéticos visando o entendimento do controle genético de tais caracteres para fins de melhoramento genético. Foram avaliadas 13 linhagens de arroz, separados em dois grupos: Grupo 1 composto de seis linhagens suscetíveis ao frio, e Grupo 2 composto de sete linhagens tolerantes ao frio. Os dois grupos foram cruzados de acordo com o delineamento em dialelo parcial (MIRANDA FILHO; GERALDI, 1984) originando 42 combinações híbridas. Os 55 tratamentos (42 híbridos e 13 genitores) foram avaliados no campo em 2005, em duas épocas de plantio, no Centro Internacional de Agricultura Tropical - CIAT. Utilizou-se um delineamento em blocos casualizados com quatro repetições e parcelas constituídas de uma linha com 17 plantas. Os mesmos tratamentos foram avaliados para tolerância ao frio em câmara de crescimento, em três experimentos, utilizando solo como substrato, temperaturas de 16 °C e 12 °C durante o dia e noite, respectivamente, e fotoperíodo de 12 horas com luz artificial. Utilizou-se o mesmo delineamento experimental...

Avaliação morfo-funcional do sistema mucociliar de traquéia de rato submetida a diferentes métodos de preservação em modelo de isquemia experimental; Morphological and functional evaluation of the tracheal mucociliary clearance of rats submitted to different methods of preservation after cold ischemia

Pereira, Artur Eugênio de Azevedo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 09/12/2011 PT
Relevância na Pesquisa
36.44%
INTRODUÇÃO: O transplante traqueal continua um desafio. Contudo, avanços nas técnicas de revascularização dos enxertos traqueais e no conhecimento da imunobiologia da traquéia, indicam que esta técnica pode ser utilizada com freqüência no futuro próximo. A depuração mucociliar (DM) é o mecanismo de defesa inato mais importante das vias aéreas. A traquéia age como um órgão de defesa devido à DM. A DM ocorre por ação do batimento ciliar do epitélio respiratório que impele o muco que atapeta as vias respiratórias, carreando substâncias nocivas. Idealmente, a DM deve ser preservada em enxertos traqueais passíveis de utilização para transplante traqueal. Nosso intuito foi: 1) avaliar os efeitos da isquemia fria sobre a DM; e 2) avaliar a ação de soluções de preservação administradas por via tópica na manutenção da DM após isquemia fria. MÉTODOS: De 109 ratos Wistar foram obtidos 217 segmentos traqueais. Os segmentos foram distribuídos entre três grupos experimentais e um grupo Controle. Cada segmento foi submergido em LPD-glicose (grupo LPD), histidina-triptofano-cetoglutarato (grupo HTK) ou solução salina (grupo Salina). Avaliou-se a DM após 6,10,16 ou 24 horas de isquemia fria. No grupo Controle os segmentos foram analisados imediatamente após a extração...

Comportamento estrutural de perfis formados a frio com seção transversal composta de U enrijecido em temperaturas elevadas; Structural behavior of lipped I and box built-up cold formed steel columns under high temperature

Kimura, Érica Fernanda Aiko
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 05/06/2014 PT
Relevância na Pesquisa
36.41%
No contexto da construção civil brasileira, é reconhecido o fato de que os perfis de aço formados a frio têm grande demanda em diversos tipos de sistemas estruturais. Uma das aplicações refere-se às barras com seções transversais compostas em duplo U enrijecido, comumente presente no sistema de vigas e pilares de edificações. Quando submetido à ação térmica decorrente de um incêndio, o comportamento dos perfis formados a frio se torna de avaliação relativamente complexa, pois há ocorrência de dois fenômenos que levam à perda da sua capacidade portante: a ocorrência dos modos de instabilidade e a redução da resistência do material. Dessa forma, neste trabalho foi desenvolvido um estudo sobre perfis de aço formados a frio submetidos a temperaturas elevadas. As seções transversais adotadas foram do tipo I enrijecido e tubular retangular do tipo caixão, compostas por dois perfis U enrijecido unidos por solda intermitente. A ação mecânica aplicada consistiu em uma compressão centrada, bem como uma ação térmica, cuja taxa de aquecimento segue a curva de incêndio padrão definida pela International Organization for Standardization. A investigação aqui apresentada foi desenvolvida em campo experimental e numérico. Foram realizados ao todo 17 ensaios de compressão...

Rice cold tolerance at the reproductive stage in a controlled environment; Tolerância ao frio do arroz no estádio reprodutivo sob condições controladas

Cruz, Renata Pereira da; Milach, Sandra Cristina Kothe; Federizzi, Luiz Carlos
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
36.47%
A tolerância do arroz (Oryza sativa L.) ao frio no período reprodutivo é importante para garantir alto rendimento em ambientes com temperatura baixa. No entanto, a seleção em condições de campo não permite identificar fontes adequadas de tolerância e limita a seleção de linhas segregantes devido à temperatura variável. Este trabalho teve por objetivo definir uma metodologia capaz de distinguir genótipos de arroz quanto à sua tolerância ao frio no período reprodutivo quando avaliados sob temperatura controlada. O efeito do frio foi investigado em seis genótipos de arroz submetidos a 17°C por períodos variáveis de tempo (três, cinco, sete e dez dias) em dois estádios do período reprodutivo (microsporogênese e antese). A tolerância ao frio foi avaliada por meio da porcentagem de redução na exerção da panícula e na fertilidade de espiguetas. O resultados indicaram que avaliar a tolerância ao frio por meio da redução na exerção da panícula não permitiu separar genótipos tolerantes ao frio de genótipos sensíveis e, quando avaliada por meio da redução na fertilidade de espiguetas, no mínimo sete dias foram necessários para diferenciar os genótipos quanto à tolerância ao frio. Eles foram mais sensíveis ao frio na antese que na microsporogênese e...

The role of ribonuclease R in bacterial adaptation to cold shock

Silva, Cátia Cláudia Bárria da
Fonte: Faculdade de Ciências Médicas Publicador: Faculdade de Ciências Médicas
Tipo: Dissertação de Mestrado
Publicado em //2011 ENG
Relevância na Pesquisa
36.42%
RESUMO:Os microrganismos reagem à súbita descida de temperatura através de uma resposta adaptativa específica que assegura a sua sobrevivência em condições desfavoráveis. Esta adaptação inclui alterações na composição da membrana, na maquinaria de tradução e transcrição. A resposta ao choque térmico pelo frio induz uma repressão da transcrição. No entanto, a descida de temperatura induz a produção de um grupo de proteínas específicas que ajudam a ajustar/re-ajustar o metabolismo celular às novas condições ambientais. Em E. coli o processo de adaptação demora apenas quatro horas, no qual um grupo de proteínas específicas são induzidas. Depois desde período recomeça lentamente a produção de proteínas.A ribonuclease R, uma das proteínas induzidas durante o choque térmico pelo frio, é uma das principais ribonucleases em E. coli envolvidas na degradação do RNA. É uma exoribonuclease que degrada RNA de cadeia dupla, possui funções importantes na maturação e “turnover” do RNA, libertação de ribossomas e controlo de qualidade de proteínas e RNAs. O nível celular desta enzima aumenta até dez vezes após exposição ao frio e estabiliza em células na fase estacionária. A capacidade de degradar RNA de dupla cadeia é importante a baixas temperaturas quando as estruturas de RNA estão mais estáveis. No entanto...

Effect of Sequential Cold Shocks on Survival and Molting Rate in Triatoma infestans Klug

Campos,Silvana GP; Rodrigues,Vera Lúcia CC; Wada,CY; Mello,Maria Luiza S
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2002 EN
Relevância na Pesquisa
36.41%
The survival and molting incidence in Triatoma infestans, a vector of Chagas disease, were investigated following sequential shocks at 0ºC in fifth instar nymphs under moderate fasting and full nutritional conditions. The shocks were separated by intervals of 8 h and 24 h at 30ºC. The results indicated that in terms of insect survival, T. infestans is tolerant to a single cold shock at 0ºC even for 12 h, or to sequential cold shocks, regardless of the nutritional state of the specimens. In terms of molting rate, fasting enhanced the tolerance to sequential cold shocks, but did not exceed the tolerance acquired by fully-nourished specimens, except when cold shocks were separated by an 8 h interval at 30ºC. The protective action elicited by fasting was assumed to be additive to that induced by a single mild cold shock or sequential cold shocks. The cold-tolerance response of T. infestans may have favoured its survival in areas of South America with low temperatures, even considering that this species is predominantly associated with human habitats.

Rice cold tolerance at the reproductive stage in a controlled environment

Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe; Federizzi,Luiz Carlos
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2006 EN
Relevância na Pesquisa
36.47%
Cold tolerance of rice (Oryza sativa L.) during the reproductive stage is important to guarantee high yield under low temperature environments. Field selection, however, does not allow identification of adequate tolerance sources and limits selection of segregating lines due to variable temperature. The objective of this study was to devise methods for distinguishing rice genotypes as to their cold tolerance at the reproductive stage when evaluated under controlled temperature. The effect of cold temperatures was investigated in six rice genotypes at 17°C for varying length of time (three, five, seven and ten days) at two reproductive stages (microsporogenesis and anthesis). Cold tolerance was measured as the percentage of reduction in panicle exsertion and in spikelet fertility. Evaluating cold tolerance through the reduction in panicle exsertion did not allow for the distinction between cold tolerant from cold sensitive genotypes and, when the reduction in spikelet fertility was considered, a minimum of seven days was required to differentiate the genotypes for cold tolerance. Genotypes were more sensitive to cold at anthesis than at microsporogenesis and, as these stages were highly correlated, cold screening could be performed at anthesis only...

The effect of cold forming on structure and properties of 32 CDV 13 steel by radial forging process

Arreola-Herrera,Rodolfo; Cruz-Ramírez,Alejandro; Suárez-Rosales,Miguel Ángel; Sánchez-Álvarado,Ricardo Gerardo
Fonte: ABM, ABC, ABPol Publicador: ABM, ABC, ABPol
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2014 EN
Relevância na Pesquisa
36.41%
The present study focuses on the effect of various degrees of plastic deformation generated by cold radial forging on the mechanical properties and the fracture morphology of 32 CDV 13 steel. The cold forging percentage was evaluated for 17.45, 33.30, 42.0 and 46.47 %. The microstructural analysis of the steel shows tempered martensite. The tensile strength, yield strength and hardness were found to increase with the increase of cold forging percentage due to the energy stored in the material during cold forging. For higher cold forging percentage, the toughness of the material was decreased according to the reduction of absorbed energy obtained during deformation. Fractography of the Charpy impact specimens shows a surface roughness and dimple pattern for the steel as was acquired and for 17.45 and 33.3 % of cold forging; while for 42 and 46.47 % of cold forging a cleavage fracture pattern was observed.

Alterations in fatty acid composition due to cold exposure at the vegetative stage in rice

Cruz,Renata Pereira da; Golombieski,Jaqueline Ineu; Bazana,Maiara Taís; Cabreira,Caroline; Silveira,Taíse Foletto; Silva,Leila Picolli da
Fonte: Brazilian Journal of Plant Physiology Publicador: Brazilian Journal of Plant Physiology
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 EN
Relevância na Pesquisa
36.45%
Rice is a tropical plant, so cold temperature may be detrimental to its development, depending on the genotype and environmental conditions. Degree of lipid unsaturation has been related to cold tolerance due to its effect on membrane stability. So, the aim of this study was to characterize the fatty acid composition and its alterations due to cold temperature in rice genotypes of diversified origin. Forty-four rice genotypes at the V4 stage were submitted to two temperature conditions: 10°C and 28°C for two days and after this they had their leaves collected for lipid extraction and quantification. Control plants were allowed to regrow until presenting four leaves fully expanded and then were subjected to 10°C for ten days for cold tolerance evaluation. Plant survival was measured seven days after recovery at 28°C and the genotypes were grouped in three cold tolerance classes: tolerant, intermediate and sensitive. These classes differed for total saturated and unsaturated fatty acids only under the cold temperature treatment. Further analysis of the more abundant fatty acids: linoleic, linolenic and palmitic, showed that the two last ones differed between tolerant and sensitive genotypes. Linolenic acid increased after cold exposure in cold tolerant genotypes while palmitic acid decreased...

Cold-stress-induced de novo expression of infC and role of IF3 in cold-shock translational bias

Giuliodori, Anna Maria; Brandi, Anna; Giangrossi, Mara; Gualerzi, Claudio O.; Pon, Cynthia L.
Fonte: Cold Spring Harbor Laboratory Press Publicador: Cold Spring Harbor Laboratory Press
Tipo: Artigo de Revista Científica
Publicado em /08/2007 EN
Relevância na Pesquisa
36.46%
Expression of Escherichia coli infC, which encodes translation initiation factor IF3 and belongs to a transcriptional unit containing several promoters and terminators, is enhanced after cold shock, causing a transient increase of the IF3/ribosomes ratio. Here we show that after cold shock the two less used promoters (PT and PI1) remain active and/or are activated, resulting in de novo infC transcription and IF3 synthesis. These two events are partly responsible for the stoichiometric imbalance of the IF3/ribosomes ratio that contributes to establishing the cold-shock translational bias whereby cold-shock mRNAs are preferentially translated by cold-stressed cells while bulk mRNAs are discriminated against. Analysis of the IF3 functions at low temperature sheds light on the molecular mechanism by which IF3 contributes to the cold-shock translational bias. IF3 was found to cause a strong rate increase of fMet-tRNA binding to ribosomes programmed with cold-shock mRNA, an activity essential for the rapid formation of “30S initiation complexes” at low temperature. The increased IF3/ribosome ratio occurring during cold adaptation was also essential to overcome the higher stability of 70S monomers at low temperature so as to provide a sufficient pool of dissociated 30S subunits capable of “70S initiation complex” formation. Finally...

Transcription factors involved in cold response in plants.

Pillman, Katherine
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2010
Relevância na Pesquisa
36.45%
Studies in Arabidopsis have shown cold stress tolerance can be enhanced by manipulation of the CBF/DREB and ICE transcription factor genes. To date, few studies have investigated CBF and ICE genes in crops species such as barley. Using a C-repeat element as bait, two CBF genes were isolated from a cold-stressed barley cDNA library, HvCBF16 and HvCBF23. HvCBF16 was induced by cold treatment but not by other abiotic stresses. HvCBF23 was constitutively expressed and was not induced by cold treatment. The analysis of transgenic plants expressing these genes will determine their importance in cold tolerance. Transgenic barley plants expressing the barley gene HvCBF2A were found to be more cold tolerant in controlled temperature trials, and hence were assayed to determine the basis of their acquired phenotype. Northern and qRT-PCR analysis showed that four genes known to be involved in cold tolerance were significantly upregulated. Importantly the increased expression was proportional to the level of transgene expression and levels were higher following cold treatment. A homolog of the Arabidopsis ICE transcription factor was isolated from a freezing-tolerant barley variety (Hordeum vulgare L. cv. Haruna Nijo) and transcript analysis of HvICE2 under various abiotic stresses showed that expression of HvICE2 was induced at low temperatures...

Australia’s Cold War university : the relationship between the Australian National University’s Research School of Pacific Studies and the federal government 1946-1975.

Van Konkelenberg, Jude Nicholas
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2009
Relevância na Pesquisa
36.47%
The impacts of the Cold War on academic-state relations in this country have been neglected in the growing literature on the Australian Cold War. There were greater similarities between the American and Australian university experience during the Cold War than have previously been recognised. The close relationship between the Australian National University and the federal government meant that Cold War tensions were particularly heightened in the case of this university, making it an ideal site for a case study of the Australian Cold War university experience. This thesis asks, ‘what was the nature of the relationship between the Australian National University and the federal government during the Cold War and was the university‘s experience comparable to American Cold War universities?‘ The thesis seeks to address two main themes related to the Cold War experience of universities. The first is the intrusion of government agencies into universities to identify and limit the influence of communist sympathisers and the degree of complicity or otherwise of the university in these activities. The second theme is the role of universities in providing expert advice to government and the implications of this role for academic independence. The concept of the Cold War university has received significant attention in America in recent years. Discussion on this topic had moved from a belief that government influence over the universities was evil and coercive to a more moderate assessment which emphasises the mutual advantages to be gained in the relationship and the role of university administrators in creating it. Despite some significant cultural and local differences...

Maize Populations as Sources of Favorable Alleles to Improve Cold-Tolerant Hybrids

Rodríguez Graña, Víctor Manuel; Malvar Pintos, Rosa Ana; Butrón Gómez, Ana María; Ordás Pérez, Amando; Revilla Temiño, Pedro
Fonte: Crop Science Society of America Publicador: Crop Science Society of America
Tipo: Artículo Formato: 6080 bytes; image/gif
ENG
Relevância na Pesquisa
36.47%
Low spring temperatures are one of the main limiting factors for maize (Zea mays L.) growth along the European Atlantic coast. Several breeding programs have been performed to obtain cold-tolerant maize genotypes, but the few cold-tolerant inbreds and hybrids available need further improvements for cold tolerance and agronomic performance. The objective of this study was to identify cold-tolerant maize populations with favorable alleles to improve cold tolerance and agronomic performance in early sowing of two cold-tolerant hybrids. The parental inbred lines of two cold-tolerant hybrids were crossed to nine cold-tolerant populations. Tests were performed in a cold chamber and in the field for 2 yr at two locations. The populations Rojo de Tolosa and Puenteareas were the most promising sources of new favorable alleles for transferring cold tolerance to the hybrids EP80 x F7 and EP80 x Z78007, respectively. The populations Puenteareas and Silver King were the most outstanding donors to improve the agronomic performance of EP80 x F7 and EP80 x Z78007, respectively. Some improved versions of the cold-tolerant inbred parents could be developed from crosses between F7 or Z78007 and Puenteareas; alternatively, Rojo de Tolosa or Silver King could be used as donors of favorable alleles...

Combining Maize Base Germplasm for Cold Tolerance Breeding

Rodríguez Graña, Víctor Manuel; Butrón Gómez, Ana María; Sandoya Miranda, Germán; Ordás Pérez, Amando; Revilla Temiño, Pedro
Fonte: Crop Science Society of America Publicador: Crop Science Society of America
Tipo: Artículo Formato: 6080 bytes; image/gif
ENG
Relevância na Pesquisa
36.48%
Early planting can contribute to increased grain yield of maize (Zea mays L.), but it requires cold tolerance. A limited number of cold-tolerant maize genotypes have been reported. The objectives of this study were to test a new strategy to improve cold tolerance in maize searching for broad x narrow genetic combinations that may be useful as base populations for breeding programs, to compare genotype performance under cold-controlled and field conditions, and to establish the major genetic effects involved in crosses between cold-tolerant inbred lines and populations. Nine cold-tolerant populations were crossed to five inbred lines and evaluated in a cold chamber and in the field. Most inbred line x population crosses performed better than populations per se or hybrids used as checks, both in the cold chamber and in the field, suggesting that broad x narrow genetic combination could be a suitable start point for further breeding programs for cold tolerance. The crosses between the inbred line EP80 and northwestern Spanish populations are the most promising base germplasm. In particular, EP80 x Puenteareas showed the greatest yield and good performance at the first stages of development under cold conditions. In addition, EP80 and Puenteareas showed favorable general combining ability for most traits. Early vigor rating would be the most suitable trait to select maize genotypes with superior cold tolerance during emergence and postemergence stages...

Cold tolerance improvement of sugary enhancer1 hybrids of sweet corn

Ordás López, Bernardo; Padilla Alonso, Guillermo; Malvar Pintos, Rosa Ana; Ordás Pérez, Amando; Rodríguez Graña, Víctor Manuel; Revilla Temiño, Pedro
Fonte: Istituto Sperimentale per la Cerealicoltura Publicador: Istituto Sperimentale per la Cerealicoltura
Tipo: Artículo Formato: 6080 bytes; image/gif
ENG
Relevância na Pesquisa
36.46%
The ears of su1se1 hybrids have a higher quality for human consumption and maintain the eating quality for a longer period than su1 cultivars. The main problem of su1se1 hybrids when compared to su1 hybrids is reduced emergence and poor early vigour, especially in cold soils. Inbreds su1, inbreds su1se1, hybrids su1se1, and hybrids su1 x su1se1 were evaluated for traits associated with cold resistance (NW Spain, 1999 and 2000). The plants were grown in the field and in a growth chamber at cold and optimum temperatures with the following objectives: 1) to study the relationships between emergence and early vigour in the field and in a chamber at cold temperature; 2) to find sources of favourable alleles among adapted su1 inbred lines to improve cold tolerance (emergence and early vigour) in su1se1 hybrids; 3) to develop a combined method using a laboratory test and field evaluation to obtain cold-resistant genotypes. In this study we found a lack of correspondence between emergence and early vigour, and also a low correlation between the performances of the genotypes under field versus cold chamber conditions. So, when choosing a cold-tolerant genotype, both traits (emergence and early vigour) and growth in the chamber and in the field should be considered. We also found that the best genotypes under cold chamber conditions had an acceptable performance under field conditions...

Inheritance of cold tolerance at emergence and during early season growth in maize

Revilla Temiño, Pedro; Malvar Pintos, Rosa Ana; Cartea González, María Elena; Butrón Gómez, Ana María; Ordás Pérez, Amando
Fonte: Crop Science Society of America Publicador: Crop Science Society of America
Tipo: Artículo Formato: 21415 bytes; application/pdf
ENG
Relevância na Pesquisa
36.49%
Adaptation of maize (Zea mays L.) to early planting dates requires the improvement of cold tolerance, which implies high percentage emergence and vigorous seedling growth under cold temperatures. The objectives of this work were to evaluate the combining ability of elite European maize inbreds for cold tolerance and to study the inheritance of cold-tolerance. Five maize inbreds, differing in sensitivity to cold temperatures, were crossed by means of a diallel design. Hybrid seed was obtained at two production environments. Hybrids were planted on trays filled with sterilized peat in a cold chamber at four minimum temperatures, and these hybrids were also grown in field trials at two locations in northwestern Spain. The most cold-tolerant inbreds, according to previous unpublished inbred evaluations in the cold chamber, F7 and EA2087, produced the most cold- tolerant hybrids. Inbred F7 performed slightly better in hybrid combinations than EA2087 for emergence-related traits in the cold chamber, and EA2087 was superior in hybrid combinations to F7 for seedling growth. The inbred F7 may contribute cold tolerance at emergence, whereas EA2087 contributed cold-tolerance for both emergence and seedling growth. In the field, inbreds F7 and H104W were the best parent for cold-tolerant hybrids. Percentage emergence was not related to the other traits. Generally...

Haunted Borderland : The Politics on the Border War against China in post-Cold War Vietnam

Shim, Juhyung
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Dissertação
Publicado em //2014
Relevância na Pesquisa
36.41%

This dissertation deals with the history and memory of the Border War with China in contemporary Vietnam. Due to its particularity as a war between two neighboring socialist countries in Cold War Asia, the Border War has been a sensitive topic in Vietnam. While political sensitivity regarding the national past derives largely from the Party-State, the history and memory of the war has permeated Vietnamese society. The war's legacy can be seen in anti-China sentiments that, in the globalized neoliberal order, appear to be reviving alongside post-Cold War nationalism. The Border War against China represented an important nationalist turn for Vietnam. At the same time, the traumatic breakdown of the socialist fraternity cultivated anxiety over domestic and international relations. The recent territorial dispute over the South China Sea, between Vietnam and China, has recalled the history and memory of the war in 1979. The growing anti-China sentiment in Vietnam also interpellates the war as a near future.

As an anthropological approach to the history and memory of war, this dissertation addresses five primary questions: 1) how the historyscape of Vietnam's past has been shifted through politics on the Border War; 2) how the memoryscape involving the Border War has been configured as national and local experience; 3) how the Border War has shaped the politics of ethnic minorities in a border province; 4) why the borderscape in Vietnam constantly affects the politics of the nation-state in the globalized world order; and 5) why the border markets and trade activities have been a realm of competing instantiations of post-Cold War nationalism and global neoliberalism.

In order to tackle these questions...

Effect of early cold stress on the maturation of rice anthers

Imin, Nijat; Kerim, Tursun; Rolfe, Barry; Weinman, Jeremy
Fonte: Wiley-VCH Verlag GMBH Publicador: Wiley-VCH Verlag GMBH
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
36.41%
Male reproductive development in rice (Oryza sativa Linnaeus is very sensitive to various forms of environmental stresses including low temperature. Here, we present our findings on the proteomic analysis of the later developmental consequences of low temperature treatment on rice anthers. Anther proteins at the trinucleate stage, with or without cold treatment for four days at 12°C at the young microspore stage, were extracted, separated by two-dimensional gel electrophoresis (2-DE) and compared. More than 3000 rice anther proteins of cold-sensitive cultivar Doongara plants at the trinucleate stage were resolved on 2-DE gels over a pH range of 4-7 and detected by silver-staining. Seventy protein spots were differentially displayed after four days of cold treatment at the young microspore stage. Of these, 12 protein spots were newly-induced, 47 were up-regulated, and 11 were down-regulated by cold treatment at the early microspore stage. We identified 18 by matrix-assisted laser desorption/ionization mass spectrometry time of flight (MALDI-TOF) analysis. Of the identified proteins, seven were observed as breakdown (cleavage) products by a combination of 2-DE and MALDI-TOF analysis, thus demonstrating for the first time that cold temperature stress at the young microspore stage enhances and induces partial degradation of proteins in the rice anthers at the trinucleate stage.

Tolerância ao frio do arroz no estádio reprodutivo sob condições controladas; Rice cold tolerance at the reproductive stage in a controlled environment

Cruz, Renata Pereira da; Milach, Sandra Cristina Kothe; Federizzi, Luiz Carlos
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/06/2006 ENG
Relevância na Pesquisa
36.47%
A tolerância do arroz (Oryza sativa L.) ao frio no período reprodutivo é importante para garantir alto rendimento em ambientes com temperatura baixa. No entanto, a seleção em condições de campo não permite identificar fontes adequadas de tolerância e limita a seleção de linhas segregantes devido à temperatura variável. Este trabalho teve por objetivo definir uma metodologia capaz de distinguir genótipos de arroz quanto à sua tolerância ao frio no período reprodutivo quando avaliados sob temperatura controlada. O efeito do frio foi investigado em seis genótipos de arroz submetidos a 17°C por períodos variáveis de tempo (três, cinco, sete e dez dias) em dois estádios do período reprodutivo (microsporogênese e antese). A tolerância ao frio foi avaliada por meio da porcentagem de redução na exerção da panícula e na fertilidade de espiguetas. O resultados indicaram que avaliar a tolerância ao frio por meio da redução na exerção da panícula não permitiu separar genótipos tolerantes ao frio de genótipos sensíveis e, quando avaliada por meio da redução na fertilidade de espiguetas, no mínimo sete dias foram necessários para diferenciar os genótipos quanto à tolerância ao frio. Eles foram mais sensíveis ao frio na antese que na microsporogênese e...

Definition and temporal evolution of the heat and cold waves over the Spanish Central Plateau from 1961 to 2010

LABAJO,ÁNGEL L.; EGIDO,MOISÉS; MARTÍN,QUINTÍN; LABAJO,JUAN; LABAJO,JOSÉ LUIS
Fonte: Centro de Ciencias de la Atmósfera, UNAM Publicador: Centro de Ciencias de la Atmósfera, UNAM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2014 EN
Relevância na Pesquisa
36.44%
The temporal behavior of the annual frequency of heat and cold waves observed between 1961 and 2010 is established for the Spanish Central Plateau and for the two sub-areas in it. The series of daily maximum and minimum temperature anomalies for the working areas were calculated from the daily data concerning temperature anomalies. The thresholds of these series of anomalies, determined by the P10 and P90 percentiles values, were obtained. Heat waves occur when there are two or more consecutive days on which the maximum and minimum temperature anomalies are simultaneously greater than the values of the thresholds obtained for the P90 percentile. The heat waves that affected the Spanish Central Plateau and the two sub-areas during the period of time considered were identified and their monthly and annual frequencies were obtained. Likewise, a cold wave is considered to have occurred when there are two or more consecutive days on which the maximum and minimum temperature anomalies are simultaneously lower than the thresholds established by the corresponding P10 percentiles. The cold waves occurring in the study area were identified and their monthly and annual frequencies in the study period were established. According to the results...