The earth’s environments and ecosystems are not fi xed but vary over a wide range of space and time scales (Delcourt, and Webb 1982; see also fi g. 6.1). At the scale of tens of thousands of years, the wobble of the Earth on its axis causes variation in the solar radiation received at the earth’s surface, driving variation in climate. On shorter time scales, the Southern Oscillation of sea surf...

The regulation of gene transcription involves a dynamic balance between packaging regulatory sequences into chromatin and allowing transcriptional regulators access to these sequences. Access is restricted by the nucleosomes, but these can be repositioned or ejected by enzymes known as nucleosome remodellers. In addition, the DNA sequence can impart stiffness or curvature to the DNA, thereby af...

The decolorization potential of textile dye Reactive Red 198 (RR198) by Aspergillus parasiticus fungal biosorbent has been investigated as a function of initial pH, contact time, biosorbent and initial dye concentration in a batch system. Maximum dye biosorption capacity 1.03x10 mol g was observed at pH 2.0 and 2.0 g L of biosorbent concentration. Biosorption equilibrium was attained within 50 ...

شرایط افروزش و اشتعال سوخت‌های گداخت هسته‌ای در حضور ناخالص­‌ها، یکی از موارد مهمی است که طراحی قرص‌های سوخت باید مورد توجه قرار گیرد. این مقاله اثر ناخالصی هسته سنگین طلا بر کلیه فرایندهای احتراق پلاسمای غیرتعادلی دوتریم- تریتیم مدل چهار دمایی آن شکل تابع توزیع انرژی رفتار فوتون‌ها تأثیر می‌گذارد بررسی گرفته است. مطالعه شامل اثرات منفی سوخت، طول زمان تشکیل لکه داغ نتایج محاسبات عددی به­ دست آم...

Enterohepatic circulation of NY-198 in rats was studied. NY-198 glucuronide in the bile was rapidly hydrolyzed to NY-198 by the intestinal contents. Hydrolyzed and parent NY-198 in the bile were reabsorbed from the intestine. The amount of NY-198 in enterohepatic circulation was 59.8% of that excreted in the bile.

Ar-Benzyladriamycin-14-valerate (AD 198) ¡s a highly lipophilic ana logue of Adriamycin with novel cytotoxic mechanisms, greater in vivo antitumor activity, and the ability to circumvent multidrug resistance due to P-glycoprotein-mediated drug efflux or decreased topoisomerase II activity. To identify the mechanism(s) which may confer AD 198 resist ance, J774.2 mouse macrophage-like cells were...

conclusions considering the simplicity and efficiency of zero valent iron powder, this method is recommended for removing azo dyes from aqueous environments. results the results of this research showed ph = 3 and contact time = 120 minutes, increasing the zvi dose from 200 to 5000 mg/l in 100 mg/l dye concentration, increased the adsorption efficiency from 36.78% to 97.57%. rr-198 removal follo...