نتایج جستجو برای: counter ion

تعداد نتایج: 244492  

Journal: :Proceedings of the National Academy of Sciences 2019

2010
Benjamin E. Steinberg Kassidy K. Huynh Alexandre Brodovitch Sabrina Jabs Tobias Stauber Thomas J. Jentsch Sergio Grinstein

The profound luminal acidification essential for the degradative function of lysosomes requires a counter-ion flux to dissipate an opposing voltage that would prohibit proton accumulation. It has generally been assumed that a parallel anion influx is the main or only counter-ion transport that enables acidification. Indeed, defective anion conductance has been suggested as the mechanism underly...

2008
S. V. Lebedev

Abstract. Paper reports observation of the LH transition at very low density in the experiments on countercurrent Neutral Beam Injection (NBI) in the TUMAN-3M tokamak. The transition has been found at target average density as low as 0.5⋅10 m. Low input power in these experiments should be noticed: Pinput ≈ 1.3POHM < 240 kW. Contrary, in the case of co-current NBI the LH transition is difficult...

Journal: :International journal of pharmaceutics 2013
Enes Supuk Muhammad U Ghori Kofi Asare-Addo Peter R Laity Pooja M Panchmatia Barbara R Conway

Salt formation is an effective method of improving physicochemical properties of acidic and basic drugs. The selection of a salt form most suitable for drug development requires a well-designed screening strategy to ensure various issues are addressed in the early development stages. Triboelectrification of pharmaceutical powders may cause problems during processing such as segregation of compo...

Journal: :Soft matter 2016
Feriel Meriem Lounis Joseph Chamieh Laurent Leclercq Philippe Gonzalez Hervé Cottet

In this work, a systematic study of the interactions between poly(l-lysine) and variously charged statistical copolymers of acrylamide and 2-acrylamido-2-methyl-1-propanesulfonate (PAMAMPS) has been carried out by frontal analysis continuous capillary electrophoresis (FACCE). FACCE was successfully implemented to obtain the interaction parameters (binding constant and stoichiometry) at differen...

Journal: :Journal of the American Society for Mass Spectrometry 2002
Dorina Fati Victoria Leeman Yury V Vasilév Thomas Drewello Bernard Leyh Hartmut Hungerbühler

The complexation of alkali metal ions with amphiphilic fullerene derivatives has been investigated by matrix-assisted laser desorption/ionization (MALDI) time-of-flight (TOF) mass spectrometry. The formation of analyte ions occurs via two competing mechanisms including electron transfer from matrix-derived ions and metal ion attachment. The interplay of these processes has been examined by lase...

سلیمان‌نژاد, ژانت, صدقی‌نیا, سیما, نصیبی‌پور, مینا,

The compound of (Htmb)2[Ni(pydc)­2)].H2O (1) (In that tmb and pydc are 3,3¢,5,5¢-tetramethyl benzidine and pyridine -2,6- dicarboxylic acid, respectively) was synthesized via the proton transfer method and the structure was determined by single crystal X-ray diffraction. This compound crystalized in monoclinic crystal system and C2/c space group. In the asymmetry unit of compound 1, there are h...

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