منابع مشابه
Recent Studies in Metal-cyclopentadienyl and Metal-arene Chemistry
The formation, chemical reactivity, and spectral properties of a variety of new ,r-bonded and G-bonded organic derivatives of the transition metals are described. The Effective Atomic Number (E.A.N.) Rule predicts the existence of an isoelectronic series of mixed 'sandwich' complexes which contain a cyclo-pentadienyl ring and carbocyclic rings of varying sizes. Bis(it-cyclopenta-dienyl)iron or ...
متن کاملMetal-diboride nanotubes as high-capacity hydrogen storage media.
We investigate the potential for hydrogen storage of a new class of nanomaterials, metal-diboride nanotubes. These materials have the merits of a high density of binding sites on the tubular surfaces without the adverse effects of metal clustering. Using the TiB2 (8,0) and (5,5) nanotubes as prototype examples, we show through first-principles calculations that each Ti atom can host two intact ...
متن کاملRecent advances in the studies on luotonins.
Luotonins are alkaloids from the aerial parts of Peganum nigellastrum Bunge. that display three major skeleton types. Luotonins A, B, and E are pyrroloquinazolino-quinoline alkaloids, luotonins C and D are canthin-6-one alkaloids, and luotonin F is a 4(3H)-quinazolinone alkaloid. All six luotonins have shown promising cytotoxicities towards selected human cancer cell lines, especially against l...
متن کاملsurvey on the rule of the due & hindering relying on the sheikh ansaris ideas
قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
15 صفحه اولA Review on Recent Findings on Amino Acids Requirements in Poult-Studies
Amino acids (AA) are important in poultry nutrition not only for protein deposition, but also for other metabolic functions; such as improving immune and gut functions. Although, some table values are available on amino acids requirement, AA requirements may vary due to changes in dietary composition and breeding selection. Thus amino acids requirements have remained an ongoing research topic. ...
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ژورنال
عنوان ژورنال: Bulletin of the Japan Institute of Metals
سال: 1986
ISSN: 0021-4426,1884-5835
DOI: 10.2320/materia1962.25.1018