Determining the metabolic rate of larval invertebrates from aquatic habitats is complicated by the problems of small size and the scarcity of suitable measurement techniques. In this study, coulometric respirometry (a new technique for the study of marine embryos and larvae) was used to explore several issues associated with the rate of energy use during embryonic and larval development of mari...

in present study we determine the zinc and lead levels in human blood samples by differential pulse polarography under optimum experimental conditions (ph=7.5, scan rate=5mv/s and pulse amplitude=50mv) the polarographic reduction peaks of zn and pb were examinedin the -0.72 v and-0.15 respectively. the zinc and lead content can be determined by in comparison with their standard solutions. accor...

devices originally described by Clark and Bargeron1 in 1959 provide a simple, rapid and reproducible means of detecting and localizing intracardiac shunts. Their clinical application has been well documented in the past five years.25 This paper will describe a modification of the platinum electrode and its application and a modification of the method of hydrogen gas administration. The advantag...

Measurements of respiration rates are essential to quantify the energy requirements of embryos and larvae. Here we describe a 'pBOD' method that employs small (< l ml) Biological Oxygen Demand (BOD) glass vials in which embryos and larvae are incubated. A decrease in oxygen concentration is measured by injecting seawater from each vial into the measurement chamber of a standard polarographic ox...

The electroreduction of 4 ,4 ' -azobispyr idinel , l ' -d ioxide (APDO) in dimethyl formamide solutions was studied by polarography, cyclic vol tammetry, controlled potential coulometry, and electron spin resonance, Voltammetric reduction showed two well-defined, reversible one-elect ron transfers. Coulometric reduction at a potential corresponding to the plateau of the first wave gave evidence...