THE SIZE OF STREPTOCOCCUS BACTERIOPHAGES AS DETERMINED BY X-RAY INACTIVATION INFORMATION about the particle size of bacteriophages has been obtained chiefly by ultrafiltration and centrifugation methods. Data of various authors, as oollected by Elford,l seem to indicate that the particles of each phage are homogeneous in size; and that particle size is a oharacteristie property of each phage. C...

To quantify the solute permeability of rat cerebral microvessels, we measured the apparent permeability (P) of pial microvessels to various sized solutes. The pial microcirculation was observed by a high numerical aperture objective lens through a section of the frontoparietal bone thinned with a micro-grinder (a revised method from Easton and Fraser, 1994, J Physiol. 475:147-157, 1994). Sodium...

Natural single-crystal specimens of althausite from Brazil, with general formula Mg2(PO4)(OH,F,O) were investigated by Raman and infrared spectroscopy. The mineral occurs as a secondary product in granitic pegmatites. The Raman spectrum of althausite is characterized by bands at 1020, 1033 and 1044 cm(-1), assigned to ν1 symmetric stretching modes of the HOPO3(3-) and PO4(3-) units. Raman bands...

Donahue and Clare (1999) provide a number of criticisms of our study of the ecological effects of ultraviolet (UV) light in a Tennessee stream (Hill et al. 1997), asserting that errors in experimental design, site selection, and parameter choice prevented us from detecting potential UV effects on periphyton and grazers. Here, we examine the merit of these criticisms and reemphasize the potentia...

The thermal stability of Cs 2 AgInCl 6 is improved from 7.4%@475 K to 51.3%@475 by substituting Sc for In.

Delta, a simple measure of the difference between two texts, has been proposed by John F. Burrows as a tool in authorship attribution problems, particularly in large ‘open’ problems in which conventional methods of attribution are not able to limit the claimants effectively. This paper tests Delta’s effectiveness and accuracy, and shows that it works nearly as well on prose as it does on poetry...

American boxwood, Buxus sempervirens var. globosum, was tolerant of Helicotylenchus dihystera [in field microplots] as measures of plant growth were similar to the control and nematode densities were maintained at high levels (1,705-1,810/500 cm(3) soil after 29 months). Boxwood was intolerant of Pratylenchus vulnus at initial densities of 163, 281, or 475 nematodes per 500 cm(3) soil. In compa...

A freestanding, binder-free flexible polypyrrole: polystyrene sulfonate/cellulose nanopaper (PPy:PSS/CNP) electrode is successfully fabricated by a low-cost, simple, and fast vacuum filtration method for the first time. The hierarchical structure of CNP with high surface area good mechanical strength not only provides electroactive region shortens diffusion distance electrolyte ions, but also m...