نتایج جستجو برای: ایزوتوپ sr
تعداد نتایج: 28184 فیلتر نتایج به سال:
the objective of research was to explore the suitability of lipids like compritol 888 ato and stearic acid as release retardant to develop sustained release (sr) tablets. the sr micromatrices of lipid (s) and glipizide were prepared (lm1- lm6) as intermediate product by fusion method and assessed for various pharmacotechnical properties. micromatrices were formulated as sr tablets (f1-f6) by di...
Atrial fibrillation (AF) is associated with worse outcomes in many cardiovascular diseases. There are few data examining pacemaker implantation rates and indications in patients with AF who undergo transcatheter aortic valve replacement (TAVR). To examine the impact of AF on the incidence of and indications for pacemakers in patients undergoing TAVR, we evaluated data of 1723 patients without p...
Of the many ongoing controversies regarding the workings of the sarcoplasmic reticulum (SR) in cardiac myocytes, two unresolved and interconnected topics are 1), mechanisms of calcium (Ca(2+)) wave propagation, and 2), speed of Ca(2+) diffusion within the SR. Ca(2+) waves are initiated when a spontaneous local SR Ca(2+) release event triggers additional release from neighboring clusters of SR r...
We report Sr isotope anomalies in two Ca·Al-rich inclusions (EKl-4-1 and Cl) of the Allende meteoritewhichalsocontainanomaliesin 0, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to 84 Sr or 88 Sr deficits of 3.2"too and 0.8%o or to 86 Sr excesses of 1.6%o and 0.4"too. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the 8 7 Sr abundance indicate tha...
اسناد ایزوتوپ اکسیژن (oxsygen isotope) موجود در آرشیو های رسوبات دریاچه ای، ابزار رایجی جهت بازسازی دیرینه محیط هستند. در این مقاله، اسناد ایزوتوپی دریاچه های زریوار، میرآباد، بختگان و پریشان جهت بررسی شرایط اقلیمی ایران در عصر یخبندان کوچک (little ice age) مورد بررسی قرار گرفته اند. بین سالهای1350 تا 1850 مقارن با عصر یخبندان کوچک، تغییراتی در مقادیر ایزوتوپ اکسیژن این دریاچه ها قابل مشاهده اس...
خلاصه:درخت اقاقیا یکی از شناخته شده ترین گونه های گیاهی جهان از نظر میزان تثبیت نیتروژن بوده، که بطور وسیعی در پروژه های جنگلکاری در دنیا مورد استفاده قرار میگیرد. سوال اصلی این تحقیق این بود که آیا قسمتهای مختلف درخت اقاقیا (ریشه، ساقه و برگ)، به نسبت مساوی نیتروژن مورد نیاز خود را از طریق نیتروژن تولید شده ازفرایند تثبیت نیتروژن بیولوژیکی تامین میکنند. بدین منظور، بذرهای جمع آوری شده اقاقیا، ...
Mountaintop mining (MTM) is the primary procedure for surface coal exploration within the central Appalachian region of the eastern United States, and it is known to contaminate streams in local watersheds. In this study, we measured the chemical and isotopic compositions of water samples from MTM-impacted tributaries and streams in the Mud River watershed in West Virginia. We systematically do...
Background: One area of nanoscience deals with nanoscopic interactions between nanostructured materials and biological systems. To elucidate the effects of the substrate surface morphology and viscoelasticity on cell proliferation, fractal analysis was performed on endothelial cells cultured on nanocomposite samples based on silicone rubber (SR) and various concentrations of organomodified nano...
in this paper, we study some properties of the near sr-compactnessin l-topological spaces, where l is a fuzzy lattice. the near sr-compactness isa kind of compactness between lowen’s fuzzy compactness and sr-compactness,and it preserves desirable properties of compactness in general topologicalspaces.
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