Electrical resistance and polarization were measured during the passage of direct current across a single layer of protoplasm in the cells of Valonia ventricosa impaled upon capillaries. These were correlated with five stages of the P.D. existing naturally across the protoplasm, as follows: 1. A stage of shock after impalement, when the P.D. drops from 5 mv. to zero and then slowly recovers. Th...

T H E chemical composition of the foetal fluids in the rabbit was studied by Davies & Routh (1957). These investigators showed that the amniotic and exocoelomic fluids resembled extracellular fluid in their ionic composition whereas the allantoic fluid more closely resembled intracellular fluid. These findings were confirmed by Dickerson & McCance (1957). An experimental study of the trans-memb...

Many neurobiologists spurn the existence and use of direct-current (DC) electric fields (EFs) in nervous system development and regeneration. This is despite direct measurement of EFs in embryos and adults, and evidence that EFs are required for normal development, dramatically influence the rate and direction of nerve growth in vitro, and promote nerve regeneration in vivo. The notion that gro...

Motor evoked potentials (MEPs) are electrical signals recorded from neural tissue or muscle after activation of central motor pathways. They complement other clinical neurophysiology techniques, such as somatosensory evoked potentials (SEPs), in the assessment of the nervous system, especially during intraoperative neurophysiologic monitoring (IONM). Somatosensory evoked potentials directly ass...

Electrical characteristics and their changes during activation were studied with the microelectrodes on the oocytes and eggs of the toad, Bufo vulgaris formosus Boulenger. In young oocytes, the membrane characteristics had some similarities to those of nerve and muscle, except for a relatively large resistance of 25 K ohmcm.(2) and an absence of the action potential in the former. After maturat...

Solar parabolic concentrating collectors are widely and efficiently used in electrical generation. They were experimentally validated in worldwide pioneer plants. SEGS-VI 30 MW solar power plant built in southern California is one of these plants that was commissioned many years ago. In this work a possibility of installing such plant in Makkah, 21.4 °N located in moderate latitudes is studied....

~~IGI-IT, FRED s. Increasing magnitude of electrical potential along the renal distal tubule. Am. J. Physiol. 220(3): 624-638. 1971.The magnitude of the transepithelial electrical potential (PD) was examined along the length of the distal tubule of rats. To determine whether the PD is constant along the length of the tubule, several methods were used to identify distance from the beginning of t...

The cellular concentrations of Na, K, and Cl have been measured in kidney slices of the amphibian, Necturus maculosus. Permeability coefficients have been determined for Na, K, Cl, Rb, Cs, and choline, from studies both of the uptake of radioactive isotopes and the rate of cell swelling in anisotonic solutions. The results of both methods were found to agree well. Measurements were also made of...

When isolated strips of mucosal rabbit ileum are bathed by physiological electrolyte solution the electrical potential difference (PD) across the brush border (psi(mc)) averages 36 mv, cell interior negative. Rapid replacement of Na in the mucosal solution with less permeant cations, Tris or choline, results in an immediate hyperpolarization of psi(mc). Conversely, replacement of choline in the...

Dear Sir: Studies on intracellular electrical potentials in a variety of epithelial tissues which are involved in transmural Na transport have resulted in an apparent dichotomy. In tissues characterized by high transmural resistances such as isolated frog skin (1, 2), toad skin (3), and toad urinary bladder (4), the cell interior is electrically positive with respect to the outer or mucosal sol...