نتایج جستجو برای: 2 and 3
تعداد نتایج: 17388515 فیلتر نتایج به سال:
چکیده: در این پروژه تحقیقاتی، سنتز 3-هیدروکسی-2-اکسیندول ها در دمای c°80 از واکنش ایزاتین به عنوان الکتروفیل و کریتینین به عنوان نوکلئوفیل در غیاب کاتالیزور و خالص سازی آسان مورد مطالعه قرار گرفت. این روش برای یک سری از مشتقات ایزاتین های الکتروفیلی و کراتینین مورد بررسی قرار گرفت. این روش نمونه ای از یک روش سبز ایده آل برای سنتز مشتقات داروئی مهم 3-هیدروکسی-2-اکسیندول است که در آن سنتز مستقیم...
in recent years many researchers have been focused on interaction of small molecules with dna. dna is generally the primary intracellular of anticancer drugs, so the interaction between small molecules and dna can cause dna damage in cancer cells, blocking the division of cancer cells and resulting in cell death. the flavonoids are a large group of polyphenolic natural products that are widely ...
In this paper, we consider the following question, which stands as a directed analogue of the well-known 1-2-3 Conjecture: Given any digraph D with no arc uv verifying d(u) = d(v) = 1, is it possible to weight the arcs of D with weights among {1, 2, 3} so that, for every arc uv of D, the sum of incident weights out-going from u is different from the sum of incident weights in-coming to v?We ans...
abstract the present research is prepared to study the culture of tea consuming among iranian. the case group which was statistically used for this study was people of lahijan , about four hundred wich were chosen according to their age , gender , education and occupation , randomly selected to fill the questionnaire . then the data collected through the questionnaire was analyzed according ...
A novel microbial method for the production of 2',3'-dideoxynucleosides by transdideoxyribosylation has been developed. By screening microorganisms producing 2',3'-dideoxyadenosine (DDA) from 2',3'-dideoxyuridine (DDU) and adenine, Escherichia coli AJ 2595 was selected as the best producer. Optimal pH and temperature for the DDA-producing reaction were ca. 6.5 and 50 degrees C, respectively. Pi...
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