نتایج جستجو برای: 1hnmr study
تعداد نتایج: 3968844 فیلتر نتایج به سال:
The 17-membered macrocyclic spermine alkaloid protoverbine (8-phenyl-1,5,9,13-tetra azacycloheptadecan-6-one) was isolated From the aerial part of verbascum speciosum. The natural polyamines are ubiquitous bases reported to have several important functions in animals, plants and microorganisms. They are involved in processes of transcription and translation in protein synthesis and influence gr...
تعداد جدیدی از کمپلکسهایی با باز شیف سه دندانه (onn) r =bu, ph [nil(pr3)] (l=2-hydroxysalicylidene 4-nitro phenylenediamineتوسطir, uv-vis ، آنالیزعنصری و 1hnmr سنتز و شناسایی شده اند. در 1hnmr, ir کمپلکسهای سنتز شده شامل بازشیف و فسفین تایید شده است. در آنالیز عنصری نتایج بدست آمده توافق خوبی میان داده های تجربی و تئوری برای فرمول های پیشنهادی را نشان می دهد. ساختار [nil1(pph3)] توسط بلور شناسی...
در این پروژه، ابتدا یک دی¬آمین حاوی دو بازوی جانبی فورانی سنتز شد و سپس لیگاند باز ¬شیف h2l از واکنش تجمعی این دی¬آمین با سالیسیل¬آلدهید تهیه گردید. کمپلکس¬های باز ¬شیفzn2+ ،cd2+ ،mn2+ ، cu2+و ni2+ این لیگاند تهیه شد. دی¬آمین و لیگاند باز ¬شیف به وسیله ir،1hnmr ، uv-vis و اسپکترومتری جرمی و کمپلکس¬ها به¬وسیلهuv-vis و ir شناسایی شدند. کمپلکس کادمیوم علاوه بر روش¬های ذکر شده با 1hnmr نیز بررسی شد...
antibacterial activity of the aerial extracts from xanthium brasilicum prepared in methanol, diethyl ether, petroleum benzene and an equal mixture of the three solvents were studied against bacterial laboratory standards and clinical isolates using the disk diffusion method. the best antibacterial results were obtained when methanol or the solvent mixture was used. the crude extract with the hi...
abstract this mixed method study examines whether there is any relationship among the variables of the study (job satisfaction, social capital and motivation). the researcher considered job satisfaction and social capital as independent variables; motivation is the dependent variable of the study. the researcher applied a questionnaire to assess each variable. to measure efl teachers’ job sati...
In this research, we synthesized oxazine and thiazine derivatives (3-6). These of chacone compounds (1 2) that from 4- hydroxyacetophenone aldehyde such as, 4-bromobenzaldehyde chlorobenzaldehyde. chalcone (1-2) reacted with urea to produce as 4-[4-amino-6-(4-subsutitedphenyl)-2H-1,3-oxazin-2-yl] phenol (3 4) thiourea 4-[4-amino-6-(4-subsutitedphenyl)-2H-1,3-thiazin-2-yl] (5 6). were characteri...
a large number of single research studies on the effects of strategy-based instruction (sbi) in teaching english as a foreign or second language has been conducted so far. however, the lack of a comprehensive meta-analysis targeting the effectiveness of english language sbi is observed. moreover, the findings of experimental studies regarding the context of the english language, proficiency lev...
abstract this study aimed at investigating the effect of bilingual teaching of cognate words (persian-english) on iranian upper intermediate efl learners’ knowledge of lexical development. for this purpose,100 subjects participated in this study out of which 40 learners were selected for this study and they were assigned into two groups, control and experimental. cross-language cognates (wor...
A simple method for the synthesis of octahydroquinazolinone derivatives in the presence of BF3.SiO2 and Insecticide activity of these compounds against spodoptera litura was investigated to be comparable to commercial pyrethroid insecticides, Cypermethrin and Cyhalothrin. The structure of the isolated compounds was characterized by 1HNMR and FT-IR spectroscopy.The proposed method had some ad...
type text or a website address or translate a document. abstract liquidity is considered the most important aspect of the development of stock markets. the main objective of this study was to evaluate the effect of the quality of financial information provided to replace its financial statements nmvdh and shrkt hayy that the liquidity of the shares on the tehran stock exchange is between the ...
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