Changes in the electrolyte and acid-base equilibrium during the first days of life]

The concentrations of potassium, sodium and magnesium in plasma, red corpuscels and acid-base status were measured during the first five days of life. Significant differences were observed during this period of life, these values also differ markedly from those of adults. The causes of the particular conditions of the neonates are complex and not all known at present.     

Theoretical and methodological considerations in the age-job satisfaction relationship.

Research investigating the form and magnitude of the relationship between age and job satisfaction has produced mixed and generally inconclusive results. Potential explanations for such results relate to the largely atheoretical nature of research in this area as well as the inconsistent application of proper statistical and methodological controls. Our study addresses both areas of concern in an effort to permit more accurate and informed interpretations of both the form and magnitude of the age–job satisfaction relationship. We conducted hierarchical polynomial regression analyses, controlling for three different tenure measures, to examine several forms of the age–job satisfaction relationship for an all-female sample of registered nurses (N?=?81). Results supported both a U-shaped and a linear relationship between age and job satisfaction. Implications for both theory and research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Endothelial physiology and intraocular lens implantation

The endothelium is the cellular monolayer which lines the posterior surface of the cornea. This layer is important in clinical ophthalmology because it is vital to maintenance of the transparency of the cornea and vision through its pump and barrier functions which limit the ingress of fluid into the cornea from the aqueous. When the function of the corneal endothelium becomes compromised, the corneal stroma swells as it hydrates. Subsequently, epithelial bullae form with painful recurring epithelial erosions, and finally corneal scarring and blindness result. The relatively vulnerable position of the corneal endothelium renders it susceptible to iatrogenic injury during intraocular procedures, especially IOL implantation: the poor regenerative (mitotic) capacity of the human corneal endothelium limits its ability to recover normal function once it is injured.     

Gas chromatographic determination of residual methylene chloride and trichloroethylene in decaffeinated instant and ground coffee with electrolytic conductivity and electron capture detection

A method is described for the quantitative determination of residual methylene chloride (MC) and trichloroethylene (TCE) in decaffeinated instant and ground roasted coffees. The residual solvents were isolated by a closed system vacuum distillation technique with toluene as a carrier solvent, chromatographed on Chromosorb 102, detected by both electron capture and electrolytic conductivity detectors, and quantitated by comparison with an internal standard. Average recoveries of MC from instant and ground coffees spiked at 1, 10, and 25 ppm were 100.0 (88-113), 93.2 (92-95), and 97.7% (94-102%); and for TCE, 97.2 (92-101), 96.2 (95-99), and 96.5% (92-100%), respectively. The results from both detectors are compared. At lower attenuations, levels less than 1 ppm can be readily measured. The procedure developed was applied to domestic and imported coffee samples.     

Chemical and physical stability of perfluorocarbons with laser treatment

Physical and toxicological aspects of different perfluorocarbons and semifluorinated compounds are discussed. The urgent need for ultrapurification of perfluorocarbons is demonstrated. In vitro laser treatment simulating physiological conditions of two ultrapurified perfluorocarbons used for temporary tamponade and mechanical fixation of unfolded retina in case of giant tears, and one semifluorinated diether resulted in no detectable chemical alteration. Cytotoxic examinations of both laser treated and untreated probes showed no difference in cell proliferation.