Octopaminergic sensitivity of the glia that form the blood—brain barrier of the cockroach was examined using microelectrode recordings of the potential developed across this barrier layer, the perineurium. Exposure to 10~moll~ DL-octopamine had no significant effect upon the changes in potential induced by substitution of Tris for external sodium. Treatment with concentrations ranging from 10~m...

The concentrations of sodium, potassium, magnesium, cal cium, chloride, and phosphate were determined in Ehrlich ascites tumor cells and fluid after 5, 7, 9, and 12 days of growth. Material obtained after the 12th day showed peculiar intra cellular ion patterns, presumably related to the near-terminal condition. Material drawn after 5-9 days of growth represented viable cells. The intracellular...

We read a paper by Masaki et al.1) regarding a patient who underwent aortic valve replacement with functioning internal mammalian artery grafts. The authors used continuous retrograde cardioplegia in addition to moderate hypothermia without the clamping of the functioning grafts. As the authors mentioned in the Discussion, the operative mortality rate associated with redo aortic valve replaceme...

Before the mid-1990s, much data supported the hypothesis that the primary mechanism action of aldosterone was to maintain sodium, volume, and potassium homeostasis. This is accomplished by a direct effect on epithelial cells of the distal segments of the nephron to actively promote sodium transport out of and potassium transport into the tubular lumen. This primary mechanism of action was reinf...

SUMMARY Simultaneous determinations of serum potassium and sodium, blood pH, blood pressure, and 12-lead electrocardiograms were obtained in hyperkalemic patients with chronic renal failure. Statistical investigation of the data showed a high correlation between serum potassium levels and ventricular repolarization abnormalities. "Mean intracellular potassium concentration" derived from total b...

The effects of potassium-(picrate)-(18-crown-6) on the electron transport of photosystem II was investigated in isolated pea thylakoids. Low concentrations of the compound inhibited the fast decay of fluorescence yield associated with electron transfer between the primary (Q a ) and secondary (Qb) quinone electron acceptor and increased the intermediary level of fluorescence to the Fmax level. ...

BACKGROUND In recent years, digoxin use has been on the decline, with decreased incidence of digoxin toxicity. Hence, digoxin toxicity, when it occurs, remains an elusive diagnosis to emergency physicians. OBJECTIVE To present a case of digoxin toxicity with normal levels of digoxin and serum potassium, but with severe hypomagnesemia. CASE REPORT A 66-year-old woman presented with junctiona...

Opioid type of analgesics open ATP sensitive potassium channel at the cellular level to produce antinociceptive response. These channels have also been shown to modulate insulin secretion by the pancreas. 7-hydroxy flavone, an antinociceptive agent shown to act through opioid pathways was investigated for its effect on glycaemic state and associated algesic state. The involvement of ATP sensiti...

The effects of antimicrobial food additives on growth and ochratoxin A production by Aspergillus sulphureus NRRL 4077 and Penicillium viridicatum NRRL 3711 were investigated. At pH 4.5, growth and toxin production by both A. sulphureus and P. viridicatum were completely inhibited by 0.02% potassium sorbate, 0.067% methyl paraben, 0.0667% methyl paraben, and 0.2% sodium propionate. At pH 5.5, 0....

The effects of stimulation of the ventromedial hypothalamus (VMH) or lateral hypothalamus (LH) with potassium chloride through a microdialysis probe were studied. The concentrations of ACh and norepinephrine (NE) in the dialysate obtained from the hypothalamic nuclei and plasma glucose concentration were measured. Stimulation of the hypothalamic nuclei, VMH and LH, with potassium increased the ...