Transfer Of Nutrient
Mostrando 13-24 de 94 artigos, teses e dissertações.
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13. Detecção e quantificação de sementes de soja geneticamente modificada resistente ao glifosato em sistema hidroponico / Detection and quantification of genetically modified soybean seeds resistant to glyphosate in hydroponics system
This work aimed at to establish a detection protocol to genetically modified (GM) soybean seeds resistant to the glyphosate, characterize the symptoms of the seedlings, and verify the efficiency of the hidroponic cultivation in the detection and quantification of GM soybean seeds mixtures in conventional seeds samples. Five assays were performed to establish
Publicado em: 2005
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14. Flow analysis and in situ analysis as aproaches to the improvement of the agronomic samples analytical pathway. / Análise em fluxo e análise in situ como estratégias de melhoramento da seqüência analítica de amostras agronômicas.
The present work discusses the use of alternative approaches for the improvement of the agronomic sample analytical pathway. It was focused on the elimination of the sampling step, with the in situ soil analysis, or in the measurement step with the adoption of flow analysis procedures, with the development of two analytical systems. The first one was employe
Publicado em: 2005
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15. WATERS ACCUMULATED IN DAMS AND BARRAGES IN THE SANTA MARIA REGION AND FLUCTUATIONS IN ITS CHEMICAL PHYSICAL ATTRIBUTES. / ÁGUAS ACUMULADAS EM AÇUDES E BARRAGENS NA REGIÃO DE SANTA MARIA E FLUTUAÇÕES EM SEUS ATRIBUTOS FÍSICO QUÍMICOS.
A qualidade das águas superficiais de reservatórios depende da forma de uso do solo na bacia de contribuição de uso e ocupação do solo. Como a recarga se dá por deflúvio superficial o enriquecimento da água por nutrientes é conseqüência da forma de agricultura na bacia. Este trabalho teve como objetivo acompanhar as flutuações em propriedades f
Publicado em: 2005
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16. Fontes autotróficas de energia para peixes do canal principal e quelônios ao longo da bacia do médio rio Negro, Amazônia Brasil
The main channel of the middle rio Negro basin is characterized by high concentrations of dissolved organic matter, low nutrient levels and low primary production. The principal autotrophs in the river system are phytoplankton, periphyton, and flooded-forest (igapó) trees. Leaves, fruits and seeds fall from igapó forests are responsible for 99% of autotrop
Publicado em: 2005
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17. Transporte de nitrogenio e metabolismo da aspargina em soja (Glycine Max L.) sob deficiencia na assimilação do nitrogenio
Experiments with soybean plants and other legumes were conducted under greenhouse conditions. Both nodulated and non-nodulated plants were found to present substantially increased aspartic acid levels and lower asparagine in the xylem bleeding sap under conditions that limit nitrogen assimilation. In soybean, the response was reversed when optimum conditions
Publicado em: 2002
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18. Mathematical Model of Plasmid Transfer between Strains of Streptomycetes in Soil Microcosms
A mathematical model was developed and used to simulate the long-term dynamics of growth and plasmid transfer in nutrient-limited soil microcosms of Streptomyces lividans TK24 carrying chromosomal resistance to streptomycin, S. lividans 1326; and S. violaceolatus ISP5438. Donor, recipient, and transconjugant survival was modelled by an extension to the Verhu
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19. Stimulation of CAM Photosynthesis in Kalanchoë blossfeldiana by Transferring to Nitrogen-Deficient Conditions
Kalanchoë blossfeldiana Poelln. cv Hikan plants were grown hydroponically with nutrient solution containing 5 millimolar NO3− (or NH4+) for 1 to 2 months and then transferred to nutrient solution containing no nitrogen. CO2 uptake at night, nocturnal increase in titratable acidity, and activity of phosphoenolpyruvate carboxylase increased after the transf
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20. Understanding placental nutrient transfer – why bother? New biomarkers of fetal growth
The placenta, in general and the physiology of maternofetal nutrient transfer is under-researched compared to other organs with epithelial transport function, as evidenced, for example, by publication numbers. This report provides reasons why more researchers should become involved in this topic. First, the syncytiotrophoblast, the transporting epithelium of
Blackwell Science Inc.
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21. Regulation of herbivore growth by the balance of light and nutrients.
Experiments using planktonic organisms revealed that the balance of radiant energy and available nutrients regulated herbivore growth rates through their effects on abundance and chemical composition of primary producers. Both algae and herbivores were energy limited at low light/nutrient ratios, but both were nutrient limited at high light/nutrient ratios.
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22. Prevention of Loss of Streptomycin Production on Repeated Transfer of Streptomyces griseus
The streptomycin-producing capacity of submerged cultures of Streptomyces griseus 107 was nearly lost during repeated transfers on synthetic nutrient medium. This effect did not occur on the same nutrient medium from which Fe++ was omitted. The physiological reason for this effect was discussed from the point of the relationship of iron-containing porphyrin
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23. Control of the Development of Iron-Efficiency Reactions in Potato as a Response to Iron Deficiency Is Located in the Roots
Roots of potato plants (Solanum tuberosum cv Bintje) growing on low Fe nutrient solution developed the characteristic Fe efficiency reactions, such as high ferric reductase activity, proton extrusion and increased root hair formation. Roots from a tuber with sprout removed, when grown on Fe-free nutrient solution, also expressed these reactions; transfer to
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24. Requirement for Acetate and Glycine (or Serine) for Sporulation Without Growth of Bacillus subtilis
Cells of Bacillus subtilis sporulate when they are transferred, at any time of growth in nutrient sporulation medium, to a potassium-phosphate buffer containing slowly utilizable carbon sources such as l-aspartate, citrate, l-glutamate, or lactate. Transfer to buffer containing more rapidly utilizable carbon sources such as malate or glucose leads to sporula