Effect of lindane on cytology and cytochemistry of exfoliated vaginal cells

Intraperitoneal injection of 5 mg or 10 mg per kg body weight of technical grade lindane twice weekly in Charles-Foster female rats induced marked disturbance of the estrous cycle, prolonging the proestrus phase considerably (5-7 times more compared to the normal) and thereby delaying ovulation. Exfoliated cells at proestrus are marked by high concentrations of glycogen, SDH and alkaline phosphatase while estrus is characterized by increased activity of acid phosphatase and mucopolysaccharides. Corresponding changes in the polysaccharides concentrations and enzyme activities of the exfoliated cells seen in the lindane treated rats were well correlated with disturbances of the cycle. The data suggest that lindane exerts an estrogen-like effect by inducing a temporary negative feedback on pituitary gonadotropin secretion.

The data base management system alternative for computing in the human services

The traditional incremental approach to computerization presents substantial problems as systems develop and grow. The Data Base Management System approach to computerization was developed to overcome the problems resulting from implementing computer applications one at a time. The authors describe the applications approach and the alternative Data Base Management System (DBMS) approach through their developmental history, discuss the technology of DBMS components, and consider the implications of choosing the DBMS alternative. Human service managers need an understanding of the DBMS alternative and its applicability to their agency data processing needs. The basis for a conscious selection of computing alternatives is outlined.

Adsorption characteristics of volatile anesthetics on activated carbons and performance of carbon canisters

The adsorption characteristics, such as the adsorption capacity, the nature of the mass transfer zone, and heats of adsorption, are important for evaluating the performances of carbon canisters for removal of waste anesthetic vapors. The adsorption capacities and the natures of the mass transfer zones were measured for halothane, methoxyflurane, enflurane, isoflurane, and trichloroethylene on Witcarb 965 activated carbon. In addition, adsorption capacities and heats of adsorption for nitrous oxide, cyclopropane and oxygen were measured on the same carbon. The data indicate that high adsorption capacities of dilute anesthetic vapors on this activated carbon permit the use of carbon canisters for removal of these volatile anesthetics from mixtures with oxygen or nitrous oxide. In contrast, high concentrations of anesthetics such as nitrous oxide and cyclopropane cannot be removed economically by disposable canisters. A simplified procedure using the "characteristic curve" concept and "LUB/equilibrium section theory" for approximate prediction of the adsorption capacities and evaluation of the performance of a canister is outlined.