نتایج جستجو برای: n03
تعداد نتایج: 123 فیلتر نتایج به سال:
Two field experiments (Spring, 1974 and 1975) were conducted on Myakka fine sand to determine the effect of lime and nitrogen source on the development of Fusarium wilt of cucumber and watermelon. The same site, with the same experimental design, was used for each experiment. In both experiments, gross yields were increased and wilt development decreased by raising the soil pH with hydrated lim...
The influence of three salts (KN03, NH4N03 and (NH4>2S04) in different concentrations, on the growth and mineral composition of olive seedlings cultured in vitra and in greenhouse conditions, was studied. The best growth was obtained in in vitra culture through the applications of NH4N03, in concentrations of 10 and 20 mM of N. Addition of (NH4)2S04 clearly damaged the seedlings and increased t...
In order to apply manure or compost to fulfill the nutrient requirements of a crop, knowledge of the amount of nutrients mineralized following application is needed. Nutrient mineralization from applied manure depends on temperature, soil moisture, soil properties, manure characteristics, and microbial activity. Since these factors cannot be accurately predicted, nutrient mineralization from ap...
Yersinia pestis, the etiologic agent of the disease plague, has been implicated in three historical pandemics. These include the third pandemic of the 19(th) and 20(th) centuries, during which plague was spread around the world, and the second pandemic of the 14(th)-17(th) centuries, which included the infamous epidemic known as the Black Death. Previous studies have confirmed that Y. pestis ca...
The stable ternary copper(II) complexes of ATP and ADP, [Cu(HoATP)(phen)]2 • 7 HoO (2) and [Cu4(HADP)2(bipy)4(H20)2(N03)2] • 2 N0 3 (3), have been isolated from aqueous solution at respective pH values of 2.8 and 4.0. Their structures have been established by single crystal X-ray diffraction. Tridentate coordination of each of the Cu atoms by ono a-, one ßand one y-phosphate O atom of one ATP m...
هدف از این پژوهش تولید نانو پودرهای α-Al2O3 با روش سنتز احتراقی محلول میباشد. دلیل انتخاب این روش سرعت، مقرون به صرفه بودن و همچنین تولید مستقیم α-Al2O3 بدون نیاز به یک مرحله آنیل اضافی میباشد. α-Al2O3 ذاتا یک ماده ترمولومینسانس است و ما به دنبال بهبود خواص ترمولومینسانسی آن برای استفاده به عنوان یک دوزیمتر هستیم. در این مقاله به منظور بهبود خواص ترمولومینسانس α-Al2O3 از ناخالصیهای مس و لیتی...
A positive selection method for isolation of nitrogenase-derepressed mutant strains of a filamentous cyanobacterium, Anabaena variabilis, is described. Mutant strains that are resistant to a glutamate analog, L-methionine-D,L-sulfoximine, were screened for their ability to produce and excrete NH4' into medium. Mutant strains capable of producing nitrogenase in the presence of NH4' were selected...
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