Nearly 10(6) cells of Cryptococcus neoformans were cultured per g of pigeon droppings in a vacant tower. The air in the tower contained an average of 45 viable cells of C. neoformans per 100 liters: 60% of the cells were less than 4.7 micron in diameter. It is estimated that a human exposed to this atmosphere for 1 h would have 41 cells of c. neoformans deposited in the lungs. Sweeping resulted...

The activity of the ectoenzyme 5'-nucleotidase (5'N) was determined in the T lymphocyte subpopulations from patients with chronic lymphocytic leukemia (CLL). 5'N could be detected only in the T cells from patients whose B cells also had enzyme activity. The specific activity of CLL T4 cells was 0.17 +/- 0.02 micron/h/mg protein, similar to that of normal T4 cells, which was 0.13 +/- 0.08 micron...

1. Gluconeogenesis from pyruvate was measured in renal-cortical-tubules fragments prepared from fed male rats 6-8 days after adrenalectomy or sham adrenalectomy. The response of this process to 3':5'-cyclic AMP and adrenaline was compared in these two states at two Ca2+ concentrations. 2. Adrenalectomy decreased the percentage stimulation of gluconeogenesis by 3':5'-cyclic AMP, but increased pe...

High molecular weight nano/micron sized polystyrene (Mv=1X10) was prepared from styrene and hydrogen peroxide over a range of temperature, shear rate and concentration of catalysts. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements indicated that the size of particles matched with that of the single polymer chain. The same ...

Circuit design in deep sub-micron technologies requires that designers deal with numerous data, constraints, analysis, synthesis, and optimization tools. Although synthesis tools are widely used at Intel, new circuit technologies are evolving and are often not well supported by existing synthesis tools. Deep sub-micron technology requires that the impact of physical design be considered early i...

Over a scale which extends from about a fraction of a micron to tens of microns, metals display a strong sizedependence when deformed non uniformly into the plastic range: smaller is stronger. This e€ect has important implications for an increasing number of applications in electronics, structural materials and MEMS. Plastic behavior at this scale cannot be characterized by conventional plastic...