Synthesis and turnover of the regularly arranged surface protein of Acinetobacter sp. relative to the other components of the cell envelope

The formation of the components of the cell envelope of Acinetobacter sp. 199A was investigated by measuring the incorporation of [3H]leucine into protein, [14C]galactose into lipopolysaccharide, 32P into phospholipid, and [3H]diaminopimelic acid into peptidoglycan. Whereas the lipopolysaccharide and intrinsic protein of the outer membrane were stable, some of the regularly arranged surface protein, the alpha-protein, was lost into the growth medium. Only newly synthesized alpha-protein was lost. The peptidoglycan of the murein layer was also labile. Selective inhibition of the formation of individual components of the cell envelope with penicillin, chloramphenicol, and bacitracin showed that incorporation of protein into the outer membrane required the simultaneous formation of complete lipopolysaccharide. The converse was not true: protein synthesis was not required for lipopolysaccharide incorporation. Formation of the outer membrane and the murein layer proceeded independently.     

Mutagenic effect of small doses of diethylsulfate in laboratory mice studied by specific locus method]

Diethylsulphate solution was injected intraperitoneally twice a week to male mice B10.C3H having the wild-type colour at a 5 mg/kg dose. The treatment lasted 10 weeks, so that the total dose administered was 5-20 = 100 mg/kg. In fifth week after the end of the treatment these males were crossed to YT females homozygous for seven recessive mutant genes. In the control group all the F1 descendants were of wild-type colour, while in the experimental group among 5042 F1 mice derived from DES-treated spermatogonia there was one mutant d and 4 mosaics (3 with respect to the locus c and 1 with respect to the locusa). These results are interpreted as the evidence of the mutagenic effect of DES.     

Cognitive performance in conversion hysteria

In order to test some neurobiologically based assumptions pertaining to attention and memory dysfunction in conversion hysteria, a series of tasks was given to 17 hospitalized patients with hysterical conversion reaction and to a control group of nonpsychotic patients under conditions of nonstress and stress. The results indicated significant differences in performance between hysteria and control subjects. The former group, in comparison to controls, had heightened suggestibility, greater field dependency, and greater impairment of recent memory and vigilance-attention. A discriminant analysis indicated the feasibility of using such tests as objective diagnostic criteria for hysteria.     

Antibacterial activity of the derivatives of cholic acid (author''s transl)

Serum and urinary myo-inositol and urinary glucose were estimated by means of gas-liquid chromatography in 54 patients with glomerulonephritis with and without renal failure. myo-Inositol clearance was calculated and an index was formulated which reflected changes in glomerular filtration, tubular reabsorption and catabolism of myo-inositol by the kidney. Serum and urinary myo-inositol levels were increased in glomerulonephritis with a close correlation to the degree of renal failure. In advanced forms of glomerulonephritis, glomerular filtration, tubular reabsorption and catabolism of myo-inositol were shown to be markedly deranged. Evidence obtained showed further that a derangement of tubular reabsorption and catabolism of myo-inositol also accompany milder forms of glomerulonephritis without decreased glomerular filtration. The myo-inositol index value, especially, was increased in patients with signs of disease activity as indicated by a histological examination of the kidney tissue. The index can also be regarded as a highly sensitive test of renal failure. Low grade glucosuria was shown to be frequently associated with glomerulonephritis with renal failure. Evidence was produced which suggested that the tubular reabsorption of myo-inositol was deranged earlier than glucose reabsorption in glomerulonephritis, although they may share a common step in the reabsorption process. The data suggest that the estimation of serum and urinary myo-inositol has advantages in the evaluation of kidney function.     

Heat transfer between fish and ambient water

A theoretical model is developed to predict pressure changes and velocity profiles within the foetal lung during its sporadic bursts of activity. Because of the small volume flow rates and relatively high frequencies, the linearised, unidirectional Navier-Stokes equations are used to calculate these values. About 70% of the pressure drop occurs in the first four generations and is an order of magnitude higher than the equivalent Poiseuille pressure drop. Velocity profiles, pressure falls within each generation together with the total pressure drop at different times during the cycle are illustrated.     

Recurrent hypernatremia; a proposed mechanism in a patient with absence of thirst and abnormal excretion of water

A 7-year-old girl twice developed severe hypernatremia (serum sodium values up to 194 mEq/l) without obvious cause. The ability of her kidneys to conserve water was normal, and increasing her plasma osmolality stimulated an appropriate ADH response. Unable to excrete a water load, her kidneys continued to conserve water even with a serum sodium concentration of 133 mEq/l. She was never thirsty and did not ingest sufficient fluid by choice. Although there was no demonstrable anatomic lesion, we postulate a localized defect of her thirst center. This may have modified release of ADH and resulted in an inability to dilute the urine by interrupting a pathway that could exist from the thirst center to the supraoptic nuclei. A therapeutic regimen based on these studies has prevented further hypernatremia.     

Analysis of alkaloid mixtures by charge-transfer complexation

Binary mixtures of weak and strong UV-absorbing alkaloids were analyzed by a charge-transfer spectrophotometric method, utilizing iodine in ethylene dichloride as the acceptor. In the uncomplexed form, the strong absorbing alkaloid (papaverine, quinine, ergotamine, or reserpine) was measured at a wavelength where there was no interference from weak absorbers (at 335, 332, 315, or 300 nm, respectively). The weak absorbing alkaloid (ephedrine, codeine, atropine, or homatropine methylbromide) was determined by computing its contribution to the total charge-transfer band at 295 nm where absorbance was linearly additive for mixtures. The greater increase in the original epsilon-values of the weak absorbers upon complexation with iodine relative to the corresponding increase in the epsilon-values of the strong absorbers led to good recoveries even at the low dose ratios of the weakly absorbing, and often more potent, alkaloids.