نتایج جستجو برای: calcite mgx ca1
تعداد نتایج: 14374 فیلتر نتایج به سال:
The temperatures induced in crystalline calcite upon planar shock compression (95 160 GPa) are reported from two-stage light gas-gun exp.eriments. The temperatures are obtained fitting 6-channel optical pyrometer radiances in the 450 to 900 nm range, to a Planck radiation law temperature varied from 3300 to 5400 K. Calculations demonstrate that the temperatures are some 400 to 1350 K lower than...
نالوکسان آگونیست نسبی رسپتور مو است و منجر به ایجاد رفتار جستجوی دارو می شود. در این پژوهش، اثر نالوکسان بر بیان رفتار جستجوی دارو و تداخل آن با نیتریک اکساید درناحیه ی ca1 هیپوکامپ مورد بررسی قرار گرفت. به موش هایwistar )گرم 350-250) در مدل شرطی سازی مکانی غیر طرفدار نالوکسان داخل صفاقی (0.1-0.4 mg/kg) تزریق شد. ناحیهca1 هیپوکامپ موش به صورت دو طرفه کانول گذاری شد. مطالعات رفتاری بعد ازrecover...
اعمال rtms با فرکانس پایین اثر مهاری بر روند کیندلینگ آمیگدال در موش های صحرایی داشته و باعث ممانعت از توسعه و انتشار تشنج از طریق ساختارهای مغزی نظیر ناحیه ca1 هیپوکمپ می شود. در این مطالعه اثر rtms در طی روند کیندلینگ آمیگدال بر ویژگی های الکتروفیزیولوژیک نورون های هرمی ناحیه ca1 هیپوکمپ و جریان های گاباارژیک این ناحیه مورد بررسی قرار گرفت. الکترود سه قطبی در هسته قاعده ای-جانبی آمیگدال موش...
The oriented attachment of calcite, which is a main component of biominerals, was experimentally demonstrated in an aqueous system at ambient temperatures. Calcite nanoblocks 50 nm in size were prepared by carbonation of Ca(OH)2. One-dimensional (1D) alignment of the calcite nanoblocks was induced at ambient temperatures under a basic condition (pH 12), and single-crystalline rods over 1 mmwere...
Species of Haliotis (abalone) show high variety in structure and mineralogy of the shell. One of the European species (Haliotis tuberculata) in particular has an unusual shell structure in which calcite and aragonite coexist at a microscale with small patches of aragonite embedded in larger calcitic zones. A detailed examination of the boundary between calcite and aragonite using analytical mic...
This study aims at elucidating the mechanisms regulating the interaction of Eu and Ni with calcite (CaCO3). Calcite powders or single crystals (some mm sized) were put into contact with Eu or Ni solutions at concentrations ranging from 10 to 10 mol.L for Eu and 10 mol.L for Ni. The sorption durations ranged from one week to one month. Rutherford Backscattering Spectrometry (RBS) well adapted to...
Crystallization of calcite from differently concentrated calcium chloride solutions by the CO2 gas diffusion technique in the presence of polystyrene sulfonate yields crystal superstructures with unusual morphology. From the typical calcite rhombohedra as a starting situation, the morphology can be systematically varied via rounded edges and truncated triangles to finally concavely bended lens-...
Aqueous carbonation of Ca(OH)2 is a complex process that produces calcite with scalenohedral calcite phases and characterized by inadequate carbonate species for effective carbonation due to the poor dissolution of CO2 in water. Consequently, we report a solid-liquid-gas carbonation system with an ionic liquid (IL), 1-butyl-3-methylimidazolium bromide, in view of enhancing the reaction of CO2 w...
Aragonite, which is the polymorph of CaCO3 precipitated by modern corals during skeletal formation, has a higher solubility than the more stable polymorph calcite. This higher solubility may leave animals that produce aragonitic skeletons more vulnerable to anthropogenic ocean acidification. It is therefore important to determine whether scleractinian corals have the plasticity to adapt and pro...
The growth rate and composition of cave calcite deposits (speleothems) are often used as proxies for past environmental change. There is, however, the potential for bias in the speleothem record due to seasonal fluctuations in calcite growth and dripwater chemistry. It has been proposed that the growth rate of speleothem calcite in Texas caves varies seasonally in response to density-driven flu...
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