نتایج جستجو برای: d24 c60 واژگان کلیدی
تعداد نتایج: 53080 فیلتر نتایج به سال:
A giant amphiphile, which is constructed with an amorphous nano-pyramid (triphenylamine, TPA) and a crystalline nano-sphere (C60), was synthesized. Structural characterization indicates that this pyramid-sphere-shaped amphiphile (TPA-C60 ) forms a solvent-induced ordered phase, in which the two constituent units self-assemble into alternating stacks of two-dimensional (2D) TPA and C60 nano-shee...
While several recent reports have described the toxicity of water-soluble C60 fullerene nanoparticles, none have reported the toxicity resulting from the inhalation exposures to C60 fullerene nanoparticles or microparticles. To address this knowledge gap, we exposed male rats to C60 fullerene nanoparticles (2.22 mg/m3, 55 nm diameter) and microparticles (2.35 mg/m3, 0.93 microm diameter) for 3 ...
The design of multicomponent ionic complexes of fullerenes, (D1) (C60 ) (D2) is discussed. In this approach D1 was an organic cation and D2 was a neutral structure-forming molecule. These complexes demonstrated paramagnetic-diamagnetic transitions associated with the C-C and M-C bond formation, singlet-triplet transitions and high conductivity. 1. (D) (C60 ) CoOEP contain tetramethylphosphonium...
The growth and ordering of C60 molecules on the WO2/W(110) surface have been studied by low-temperature scanning tunnelling microscopy and spectroscopy (STM and STS), low-energy electron diffraction (LEED) and density functional theory (DFT) calculations. The results indicate the growth of a well-ordered C60 layer on the WO2/W(110) surface in which the molecules form a close-packed hexagonal st...
Results of selected-ion flow tube experiments are reported that explore the nucleophilic interaction of pyrrolidine and piperidine with C60 1 , C60 , C60 31 at 294 6 2 K in helium buffer gas at a pressure of 0.35 6 0.01 Torr. Two efficient sequential addition reactions were observed with C60 1 in analogy with previous results obtained with acyclic amine nucleophiles. Multicollision-induced diss...
For long it has been recognized that tumor necrosis factor alpha (TNFa) has anticancer characteristics, and its use as a cancer therapeutic was proposed already in the 1980s. However, its systemic toxicity has limited its usability. Oncolytic viruses, selectively cancer-killing viruses, have shown great potency, and one of their most useful aspects is their ability to produce high amounts of tr...
The thermal stability of C60 dimers and 2D pressure-polymerized C60 is studied using highresolution capacitance dilatometry. The transformation of both the dimer and the polymer phases back to ‘normal’ C60 is excellently described by a simple thermally activated process, with activation energies of 1.75 r 0.1 eV (dimer) and 1.9 r 0.2 eV (polymer). These results are compared to previous data of ...
We report the preparation of novel quasi-one-dimensional (quasi-1D) C60 nanostructures on rippled graphene. Through careful control of the subtle balance between the linear periodic potential of rippled graphene and the C60 surface mobility, we demonstrate that C60 molecules can be arranged into a quasi-1D C60 chain structure with widths of two to three molecules. At a higher annealing temperat...
خالصسازی جزئی و توصیف ویژگیهای آنزیم منعقدکنندهی شیر از میوههای گیاه پنیرباد (ویتانیا کواگولانس)
سابقه و هدف: تلاشهای متعددی برای جایگزین کردن مایهپنیر حیوانی با سایر پروتئازهای منعقدکنندهی شیر، بهعلت محدودیت تولید و قیمت در حال افزایش آن انجام شده است. میوهی گیاه دارویی پنیر باد یا ویتانیاکواگولانس منبع غنی پروتئازهای منعقدکننده شیر است که از گذشته به عنوان مایهپنیر در تولید پنیرهای سنتی در جنوب ایران استفاده میشده است. مطالعات در خصوص این گیاه و بررسی ویژگیهای آنزیم آن صورت نگر...
Spectroscopic and chemical properties of γ-CD• radicals, resulting from the abstraction by HO• radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD• radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD_ radicals are reducing species producing C60 monoanion radicals, as wel...
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