Methods using dialysis or ultrafiltration are described for the collection of extracellular fluid in rumen contents for analysis of amino acids. Marked differences in the concentration of aspartic acid, glutamic acid, and alanine were found in samples of either diffusate or ultrafiltrate and in clarified acidified rumen liquor. Concentrations are given for aspartic acid, glutamic acid, alanine,...

Linderstrplm-Lang and Ottesen have reported the discovery of a bacterial enzyme which brings about the transformation of ovalbumin to a new, easily crystallizable protein, plakalbumin. Unlike other proteolytic processes, this reaction seems to involve the rupture of a limited number of peptide bonds, with the release of only slightly over 1 per cent of the total ovalbumin nitrogen (1, 2). Ville...

By determining the extent of racemization of aspartic acid in a well-dated bone, it is possible to calculate the in situ first-order rate constant for the interconversion of the L and D enantiomers of aspartic acid. Collagen-based radiocarbon-dated bones are shown to be suitable samples for use in "calibrating" the racemization reaction. Once the aspartic-acid racemization reaction has been "ca...

The strain of Escherichia coli K-12 with high aspartase activity was irradiated with UV. After mutagenesis and selection, the mutant B-715 was isolated which was 4-times more active in L-aspartic acid biosynthesis than parental K-12 strain. The highest productivity was achieved while the strain was cultivated in the ammonium fumarate medium in 37 degrees C for 18-30 hours. It was found that bet...

The microbial and enzymatic hydrolysis of poly(aspartic acid) (PAA) has been reviewed. Two PAA-degrading bacteria (Pedobacter sp. KP-2 and Sphingomonas sp. KT-1) were isolated from flesh river water. Pedobacter sp. KP-2 hydrolyzed PAA of high molecular weights over 5000. Sphingomonas sp. KT-1 hydrolyzed only PAA of low molecular weights (<5000), while the cell extract could hydrolyze high-molec...

A new peptide antibiotic complex B-43, active against Gram-positive and Gram-negative bacteria, was isolated from a strain of Bacillus circulans. This antibiotic contains aspartic acid, valine, isoleucine, leucine, phenylalanine and 2,4-diaminobutyric acid. It seems to be related to polypeptin and antibiotic complex 4205, but differs in that it contains aspartic acid residue.

We analyze the conformal limit of the matrix model describing flux backgrounds of two dimensional type 0A string theory. This limit is believed to be dual to an AdS2 background of type 0A string theory. We show that the spectrum of this limit is identical to that of a free fermion on AdS2, suggesting that there are no closed string excitations in this background.

We report on a substellar-companion search utilizing interferometric fringe-tracking astrometry acquired with Fine Guidance Sensor 3 on the Hubble Space Telescope. Our targets were Proxima Centauri and BarnardÏs star. We obtain absolute parallax values of for Proxima nabs\ 0A.7687^ 0A.0003 Cen and for BarnardÏs star. Once low-amplitude instrumental systematic errors nabs\ 0A.5454^ 0A.0003 are i...