نتایج جستجو برای: concentration curve

تعداد نتایج: 497529  

2003
T. Ari

The potential drop across a bipolar membrane was measured as a function of the applied current density. As a result, an inflection point was observed in the obtained current-voltage curve at high current density. This inflection point indicates that at high current densities water supply from outside of the bipolar membrane to the interface between a cation and an anion exchange layer is the ra...

Journal: :Talanta 1984
J F Tyson J M Appleton

Calibration in atomic-absorption spectrometry is achieved by means of a concentrationgradient chamber using a single concentrated standard solution. Calibration is rapid and extends over the entire working concentration range of the analyte, irrespective of the shape of the conventionally obtained calibration curve. No curve-fitting approximations are involved. With well-designed apparatus, dev...

Journal: :The Journal of General Physiology 1973
Lesley Harrington

The motor endplate of frog sartorius muscle was voltage clamped and the peak current to different concentrations of acetylcholine and carbachol applied in the perfusing fluid was measured. Perfusing fluid was hypertonic in order to suppress contractions. Current responses were smooth and reached a peak value within 2-5 s. The dose-response curve was usually linear even with concentrations of 10...

Journal: Desert 2009
Gh. Rahimi H. Mehrabani Yeganeh H. Moradi Shahrbabak M. Moradi Shahrbabak

Abstract The whole blood potassium concentration has shown the bimodal distribution in sheep, which has been classified into LK and HK types; HK allele is recessive to LK with a single gene inheritance. This polymorphism showed different behavior in different environment, which could be due to adaptation process. This research was conducted on the Zel and kermani breed research station, which...

2006
W. Winoto H. Adidharma Y. Shen

Polystyrene-block-polyisoprene forms micelles in supercritical and subcritical propane upon cooling and decompression. These micelles decompose upon heating and compression. At constant polymer concentration, the micellization points, both isobaric and isothermal, fall around a decreasing boundary curve in pressuretemperature coordinates. This micellization boundary curve lies above the copolym...

Journal: :the iranian journal of pharmaceutical research 0
mohammad hossein boskabady mums milad hashemzehi neurogenic inflammation research centre and dept. of physiology, school of medicine, mashhad university of medical sciences, mashhad, iran mohammad reza khazdair pharmaciutical research center and dept. of physiology school of medicine, mashhad university of medical sciences, mashhad, iran vahid reza askari student research committee, faculty of pharmacy, mashhad university of medical sciences, mashhad, iran

the stimulatory effect of the extract of portulaca oleracea (p. olerace) on β-adrenoceptor of tracheal smooth muscle was examined. to examine β-adrenoceptor stimulatory effect, concentration response curve to isoprenaline was obtained in pre-contracted tracheal smooth muscle in the presence of three concentrations of aqueous-ethanolic extract, propranolol and saline. values of ec50 (the effecti...

Journal: :Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2008
Regine Wiessner Kurt Hannemann-Pohl Reinhard Ziebig Herko Grubitzsch Berthold Hocher Ortrud Vargas-Hein Andreas Lun Ingolf Schimke Lutz Liefeldt

BACKGROUND To date, there have been no studies reliably showing an influence of the kidney on the concentration of troponins. We therefore analysed the concentration curves in patients after coronary artery bypass grafting (CABG) according to their dependence on renal function. METHODS We determined cardiac troponin I (cTnI), cardiac troponin T (cTnT) and creatinine in plasma in 28 patients a...

2008
Joel Schwartz Brent Coull Francine Laden Louise Ryan

BACKGROUND Understanding the shape of the concentration-response curve for particles is important for public health, and lack of such understanding was recently cited by U.S. Environmental Protection Agency (EPA) as a reason for not tightening the standards. Similarly, the delay between changes in exposure and changes in health is also important in public health decision making. We addressed th...

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