background:   objective: in this study, we supplemented a chemically defined medium with different combinations of selenium, calcium and calcium ionophore concentrations to obtain the best rate of human oocytes maturation, survival, and fertilization.   materials and methods: as an experimental study, three combinations of [selenium (5 μg/ml), calcium (5 μg/ml) and calcium ionophore (1 μg/ml)],...

The new synthesized thiomacrocyclic ionophore 4-phenyl-4-sulfide-11-(1-oxodecyl)-1,7-dithia-11-aza-4-phosphacyclotetradecane has proven to form Langmuir and Langmuir-Blodgett (LB) films. This ionophore shows a large affinity for copper(II) ions. Thus, the influence of the subphase composition on the surface pressure-area isotherms has been studied. The LB films have been observed by AFM and the...

Depolarization of neuroblastoma cells causes a 70-fold increase in the apparent dissociation constant KD for scorpion toxin enhancement of activation of the action potential Na+ ionophore by veratridine and a large increase in the rate of reversal of scorpion toxin action. Depolarization also inhibits binding of 125I-labeled scorpion toxin to a small number of saturable binding sites on electri...

Hydrophobic ions can generate considerable interference to ion detection in a complex analyte with membrane-based ion-selective sensors, due the hydrophobic interaction. In this paper, we demonstrate that from interaction sensors be significantly reduced by incorporating hydrophilic polyethylene glycol (PEG) into membrane. The sensor is silicon nanowire field-effect transistor (SiNWFET) its sur...

The present study aimed to evaluate the effects of immunocastration on animal growth, carcass traits, and meat quality Nellore cattle receiving or not Ionophore supplementation at pasture with concentrate (semi-feedlot). first experiment (Pasture) was carried out during rainy season, while second (supplemented = Semi-feedlot) conducted dry season. In each assessment, 60 males were allocated int...

Background: The advances in cytogenetic techniques during the last few years have permitted not only the study of large populations of wild and domestic animals, but also the detection of chromosome anomalies in embryos. Chromosomal abnormalities are the most common cause of embryonic and fetal mortality in mammals. Most reports of chromosome anomalies in parthenogenetic embryos describe numeri...

abstract background: fertilization failure is one of the most problems in assisted reproduction technology (art). objective: the aim of this study was the evaluation of oocytes activation by addition of calcium ionophore in unfertilized oocytes in icsi cycles. materials and methods: this study was done on 15 icsi cycles (stimulated with standard long protocol). mature retrieved oocytes with nor...

Voltammetric ion-selective electrodes (ISEs) based on poly(3-octylthiophene) (POT) in connection with ultra-thin membranes formulated different selective receptors (i.e., ionophores) are proposed for detection of lead, copper and silver ions (Pb2+, Cu2+ Ag+). The working mechanism the POT-membrane electrode is interconnected charge transfer processes both sides membrane, overall process dependi...

Abstract Our objective was to evaluate effects of technological management strategies on environmental impacts and net returns feedlot operations in the United States. Feedlot were simulated with Integrated Farm System Model (IFSM 4.6; USDA-ARS, University Park, PA) quantify baseline production full US beef cattle systems. Strategies included: ionophore, implant, ractopamine hydrochloride, comb...

Novel and effective calcium ion binding molecular fluorescent probes have been developed by systematic structural modification of BAPTA ionophore. The comprehensive computational studies suggested the role coordination number in chelator moiety.