نتایج جستجو برای: concentration gradient method
تعداد نتایج: 2036316 فیلتر نتایج به سال:
in present work, we have calculated the electronic properties including density of states (dos) and electron density for gan, inn and in wurtzite phase for x=0.5. the study is based on density functional theory (dft) with full potential linearized augmented plane wave method (fp-lapw) by generalized gradient approximation (gga-pbesol) for calculating electronic properties. in this report we con...
results the pellet of the 146s antigen of fmd virus serotype a was developed at a concentration of sucrose 50%. absorbance rate of the foot-and-mouth disease virus serotypes a at wavelengths of 240, 259 and 280 nm was 1.238, 1.573 and 1.157, respectively. moreover, the amount of 146s antigen at the same wavelengths was 163.416, 207.636 and 152.724 μg/ml, respectively. the amount of purified pro...
This paper presents a systematic modeling methodology for microfluidic concentration gradient generators. The generator is decomposed into a system of microfluidic elements with relatively simple geometries. Parameterized models for such elements are analytically developed and hold for general sample concentration profiles and arbitrary flow ratios at the element inlet; hence, they are valid fo...
In a recent paper, Evelyn I. Fernald 1 has shown that the osmotic concentration of the sap of different portions of stems is correlated with the tendency of buds to develop on those portions. She has found by freezing point measurements on the expressed sap that in actively growing stems of privet, chestnut, Pkiladelphus, and Bryophyllum there is a concentration gradient, the highest concentrat...
Core@shell and concentration-gradient particles have attracted much attention as improved cathodes for Li-ion batteries (LIBs). However, most of their preparation routes have employed a precisely-controlled co-precipitation method. Here, we report a facile preparation route of core@shell and concentration-gradient spinel particles by dry powder processing. The core@shell particles composed of t...
This paper describes a method to generate a concentration gradient using an osmosis-driven pump, without the need for bulky peripheral devices, such as an electric syringe pump or a pneumatic pump. By the osmosis, the flow in the microfluidic channel can be controlled even to a very slow speed (nanolitre scale), which enables its application to generate the stable and wide (width = 4 mm) concen...
Axons are guided to their targets by a combination of haptotactic and chemotactic cues. We previously demonstrated that soluble neurotrophic factor concentration gradients guide axons in a model system. In an attempt to translate this model system to a device for implantation, our goal was to immobilize a stable neurotrophic concentration gradient for axonal (or neurite) guidance. Nerve growth ...
objectives lipid components of spermatozoa have an important role in its functional activity. in this study the concentration of cholesterol, phospholipid, triacylglycerol and total lipid in different subsets of human spermatozoa, isolated as three fractions by a discontinuous puresperm gradient, was determined. methods aliquots of the liquefied semen samples (n=107) were layered on top of the ...
Over the last two decades, miniaturization, integration, and automation have made microfluidic systems popular. Core to advances in microfluidics are numerous electrophoretic separation and preconcentration strategies, some finding their origins on bench-top systems. Among them, gradient-based strategies are especially effective in addressing sensitivity challenges. This review introduces sever...
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