Wecharacterized the hyperpolarization ofthe electrical potential profile of flounder intestinal cells that accompanies inhibition of NaCl cotransport . Several observations indicate that hyperpolarization of ~, and ~b (DY'a,b) results from inhibition of NaCl entry across the apical membrane : (a) the response was elicited by replacement of mucosal solution Cl or Na by nontransported ions, and (...

A systematic experimental study of the electrical conductance of single alkanedithiol molecules (HS-(CH(2))(N)-SH) between gold contacts in air for N = 3-12 is presented. For all of these molecules, three different fundamental conductance groups (low, medium and high conductance) were observed. For long molecules (N > 7) the conductance decays exponentially with molecular length for all three c...

The relationship between the intracellular ATP concentration [ATP](i) and the electrical properties of principal cells was investigated in Malpighian tubules of the yellow fever mosquito, Aedes aegypti. Under control conditions, [ATP](i) was 0.91 mmol l(-1), the input resistance of the principal cell (R(pc)) was 334.1 k Omega, and the basolateral membrane was marked by a large K(+)-conductance ...

We tested whether O2-induced vasomotor responses of arterioles correspond to changes in membrane potential ( E m) of cells in the arteriolar wall. The cheek pouches of anesthetized male hamsters were prepared for intravital microscopy and intracellular recording. Microelectrodes containing Lucifer yellow dye were used to label smooth muscle cells (SMC) or endothelial cells (EC) during arteriola...

The electrical conductivity (EC) of soil is generally measured after soil extraction, so this method cannot represent the in situ EC of soil (e.g., EC of soils with different moisture contents) and therefore lacks comparability in some cases. Using a resistance measurement apparatus converted from a configuration of soil microbial fuel cell, the in situ soil EC was evaluated according to the Oh...

Welsh, Donald G., William F. Jackson, and Steven S. Segal. Oxygen induces electromechanical coupling in arteriolar smooth muscle cells: a role for L-type Ca21 channels. Am. J. Physiol. 274 (Heart Circ. Physiol. 43): H2018–H2024, 1998.—We tested whether O2-induced vasomotor responses of arterioles correspond to changes in membrane potential (Em) of cells in the arteriolar wall. The cheek pouches...

Various pollutants are collected into rivers through runoff when rainstorms occur, which can harm the aquatic ecological environment, therefore, strengthening analysis of river pollution sources before and after reduce impact rainstorm periods in regard to risk from water pollutants. In this study, pollutant differential characteristics source identification Henan section Huaihe River Basin wer...

A study was conducted to investigate the possibility of measuring the electrical conductivity (EC) of cow's milk as a practical and cost-effective means of determining oestrus in cows. Prostaglandin injections were used to synchronise the oestrous cycle of 15 cows. From the onset of oestrus, milk and blood samples were collected from each cow every 2nd day over a period of 22 days. A portable, ...

The function of many cells and organs in the body is absolutely dependent on their ability to generate an electrical signal termed an action potential. The action potential represents a temporal sequence of changes in the electrical potential across a local domain of a cell’s plasma membrane, and results from a carefully coordinated sequence of changes in membrane conductance for sodium and pot...