نتایج جستجو برای: پتابارور 2
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Let $R$ be a commutative ring and let $I$ be an ideal of $R$. In this paper, we will introduce the notions of 2-absorbing $I$-prime and 2-absorbing $I$-second submodules of an $R$-module $M$ as a generalization of 2-absorbing and strongly 2-absorbing second submodules of $M$ and explore some basic properties of these classes of modules.
یادگیری زبان عربی، جهت فهم قرآن کریم ــ میراث مکتوب فرهنگ و علوم اسلامی ــ بر همة مسلمانان واجب است . برای یادگیری زبان عربی، کتابهای زیادی با روشهای مختلف در گذشته و حال نوشته شده است. یکیازکتابهای آمـوزش زبانعـربی(صـرفونحو)، کتاب مبادیءالعربیة، تألیف رشید شرتونی، است. این کتاب در چهار جلد، برای چهار سطح نوشته شده و سالها است که در دانشگاهها تدریس میشود. از آنجا که نویسندة کتاب مسیح...
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A novel and straightforward synthetic protocol for the efficient construction of 3',5'-dihydro-1H-spiro[benzo[d]oxepine-2,4'-imidazoles] through a copper(I)-catalyzed reaction between 2-(2-ethynylphenyl)oxirane, sulfonyl azide, and 2-isocyanoacetate is described.
Asymmetric rotators with a 1,4-bis(ethynyl)bicyclo[2.2.2]octane (BCO) core are needed for engineering crystalline arrays of functional molecular rotors. Their synthesis uses carbinol, 2-methyl-3-butyn-2-ol, as a protecting group because of its polar character and its ability to sustain orthogonal functionalization with the further advantage of being readily removed. The synthesis in good yields...
We report the possible transmission of drug-resistant human immunodeficiency virus type 2. A 66-year-old woman from rural Guinea Bissau who had no obvious antiretroviral exposure was found to harbor a variant with the multidrug-resistance mutation Q151M. Finding this mutation among a drug-naive population presents an important public health issue that needs to be addressed for treatment to be e...
The stereoselective synthesis of 3-substituted and 3,4-disubstituted piperidine and piperidin-2-one derivatives was achieved starting from 2-pyridone. After N-galactosylation and subsequent O-silylation, nucleophilic addition of organometallic reagents proceeded with high regioand stereoselectivity at 4-position. Substituents at position 3 were stereoselectively introduced by reaction of electr...
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