نتایج جستجو برای: الکترونهای 4f
تعداد نتایج: 2571 فیلتر نتایج به سال:
Low levels of high-density lipoprotein cholesterol (HDLc) have been associated with breast cancer risk, but several epidemiologic studies have reported contradictory results with regard to the relationship between apolipoprotein (apo) A-I and breast cancer. We aimed to determine the effects of human apoA-I overexpression and administration of specific apoA-I mimetic peptide (D-4F) on tumour pro...
We report evidence of a superconducting instability (of T1g symmetry) in the infiniteU Anderson lattice in the presence of crystal fields of cubic symmetry. We assume a lattice of 4f sites, each with a total angular momentum of J = 5/2 that is split by crystal fields into a low-lying doublet of Γ7 symmetry and an excited quartet of Γ8 symmetry. Slave Bosons on the 4f sites create and destroy 4f...
We hypothesized that the apolipoprotein mimetic peptide L-4F, which induces arterial anti-oxidative enzymes and is vasoprotective in a rat model of diabetes, would ameliorate insulin resistance and diabetes in obese mice. L-4F (2 mg/kg/d) administered to ob/ob mice for 6 weeks limited weight gain without altering food intake, decreased visceral (P < 0.02) and subcutaneous (P < 0.045) fat conten...
PURPOSE Bilateral inferior petrosal sinus sampling (IPSS) is a direct method of distinguishing between pituitary and ectopic ACTH secretion. We present unilateral femoral route technique avoiding bilateral femoral venous puncture using two 4F catheters into both sides of IPSS in these obese patients. MATERIALS AND METHODS Unilateral femoral puncture using 9F guiding catheter allowed two 4F ca...
The gas phase photoelectron (PE) spectra of LnCp3 (Cp = η-C5H5; Ln = Pr, Nd, Sm), measured with a wide range of photon energy, are reported. Resonances observed in the photon energy regions of 4d to 4f excitation enable identification of ion states resulting from 4f ionization. For all three compounds molecular ion states characteristic of both 4f(n) and 4f(n-1) configurations are observed (Pr,...
امروزه نظریه تابعی چگالی و دسته معادلات تک ذره کان- شم که بر پایه این نظریه استخراج شده اند، به عنوان یک روش اساسی جهت محاسبات ساختار الکترونی جامدات مطرح می باشد. اما تاکنون فرمول بندی جامعی برای تابعی انرژی تبادلی– همبستگی که در این دسته معادلات وجود دارد، ارایه نشده است. مهم ترین تقریب هایی که برای محاسبه این عبارت استفاده می-شوند، تقریب چگالی موضعی lsda و شکل تکمیل شده آن یعنی تقریب شیب تعم...
زمینه و هدف: اثر بخشی سازه‌های مدل فرانظریه‌ای برای تغییر رفتارهایی غذایی به وسیله برخی مطالعه‌ها سئوال برانگیز شده است. هدف این مطالعه بررسی ارتباط میان سازه‌های خودکارآمدی و موازنه تصمیم‌گیری بود که این دو به عنوان متغیرهای واسطه انتقال در بین مراحل تغییر رفتار پیروی از رژیم غذایی دریافت کالری متعادل در میان زنان چاق و یا دارای اضافه وزن شهر یاسوج بود. روش بررسی: داده‌های پایه این مطالعه...
Poliovirus infection of HeLa cells results in cleavage of the p220 subunit of eukaryotic initiation factor eIF-4F and inhibits cap-dependent initiation of protein synthesis. To examine the effect of virus-induced inhibition on the structure of initiation factor complexes involved in cap binding, the polypeptide compositions of cap affinity-purified complexes from uninfected and poliovirus-infec...
Multiple spontaneous 4f(13)5d(1) --> 4f(14) emissions are predicted in Yb(2+)-doped CsCaBr(3) crystals by ab initio quantum chemical calculations. Four emission bands are found at 23,900, 26,600, 34,600, and 43,900 cm(-1) that should be experimentally observable at low temperatures. The first, third, and fourth bands are slow, electric dipole forbidden emissions that can be described as spin-fo...
In the last decades, Ce intermetallic compounds have received a lot of attention both in theory and experiment. On one side, these systems can exhibit a large variety of behaviors, such as superconductivity, huge magnetoresistance, itinerant magnetism, etc. On the other side, the nature of the 4f states is controversial since it has not been established yet which systems can be treated using a ...
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