Two modifications of Todd’s histochemical fibrin slide technique were used to study the effect of bacterial endotoxin on the plasminogen activator activity of intact normal human leukocytes in vitro. Leukocyte suspensions were obtained from heparinized peripheral blood by dextran sedimentation. Plasminogen activator activity was measured as the percentage of individual cells producing zones of ...

The light-dependent pH changes in the suspending medium of guard cell protoplasts (GCP) from Vicia faba were studied. Upon illumination, the medium was initially slightly alkalinized and then acidified. The extent of alkalinization was lower in CO(2)-free air than in normal air. This initial alkalinization was inhibited by DCMU. Acidification in CO(2)-free air became observable in shorter durat...

Although numerous workers, especially Northrop and DeKruif (1922) and Winslow, et al. (1923 and 1926), have studied the influence of electrolytes upon the electrophoretic migration velocity of bacteria by washing them free of their metabolic products and suspending them in solutions of the electrolytes, little attention has been given to the effect upon electrophoretic potential of electrolytes...

Electrophoretic deposition of carbon nanotubes (CNTs) using alternating current electric fields (0.01-1000 Hz) is reported. Pure acetone was used as suspending medium. Two parallel gold electrodes were used as depositing substrate. The effect of depositing parameters such as frequency and three waveforms (sinusoidal, rectangular and triangular) on deposit yield was investigated. According to ou...

1. Blowfly flight-muscle mitochondria respiring in the absence of phosphate acceptor (i.e. in state 4) take up greater amounts of K(+), Na(+), choline, phosphate and Cl(-) (but less NH(4) (+)) than non-respiring control mitochondria. 2. Uptake of cations is accompanied by an increase in the volume of the mitochondrial matrix, determined with the use of [(14)C]-sucrose and (3)H(2)O. The osmolari...

Interdigitated microelectrodes have been used to investigate the passive dielectrophoretic levitation of latex beads as a function of the frequency and voltage of the applied electrical signal, the suspending medium conductivity, bead size and characteristic dimensions of the electrodes. The variations of the electric field strength E and of the factor ∇E 2 as functions of the height above the ...

The swelling of mitochondria isolated from leaves, roots, and callus tissues of Nicotiana tabacum, L, var. White Gold, was measured by following changes in optical density at 520 mjt in buffered 025 M sucrose or 0.125 M KCI. Ozone induced rapid swelling of the isolated mitochondria and increased the permeability of mitochondrial membranes. The extent of mitochondrial swelling and the amount of ...

The suspending semantic model for the execution of the MONSTR generalised term graph rewriting language is defined. This is the canonical operational semantic model for the MONSTR language. Its correctness with respect to DACTL semantics is discussed, and a number of general theorems on the soundness of suspending executions with respect to DACTL semantics are proved. General theorems are prove...