The electrical impedance of the human thorax as a guide in evaluation of intrathoracic fluid volume.

The modelling of the human thorax and the impedance characteristics of the thorax are presented. A two-dimensional model of the thorax was constructed by using more than four hundred reference points. The input impedance was calculated by solving the Helmholtz equation for zero charge density and low frequencies.

Evidence for the specific association of the chromosomal origin with outer membrane fractions isolated from Escherichia coli.

DNA-envelope complexes isolated from osmotically lysed spheroplasts of Escherichia coli contained 0.2 to 1% of the total cellular DNA after labeling with [3H]thymidine. Molecular weight determinations indicated that the amount of bound DNA was equivalent in most cases to a maximum of three binding sites per chromosome.