Nuptial gifts that are manufactured by the male are found in numerous insect species and some spiders, but there have been very few studies of the composition of such gifts. If, as has been proposed recently, nuptial gifts represent sensory traps, males will be selected to produce gifts that are attractive to females but such gifts will not necessarily provide the female with nutritional benefi...

Acyl phosphatase has been purified 25,000-fold from bovine brain. The enzyme is more than 97% pure by acrylamide gel disc electrophoresis. The calculated molecular weight from gel filtration measurements on Sephadex G-75 was 12,100; the value calculated from the amino acid composition was 8,732. Independent determinations of free -SH groups and tyrosine content were in agreement with the amino ...

An auxin-requiring soybean root callus metabolized [1-(14)C]-2,4-dichlorophenoxyacetic acid (2,4-D) to diethyl ether-soluble amino acid conjugates and water-soluble metabolites. The uptake in tissue varied with incubation time, concentration, and amount of tissue. Uptake was essentially complete (80%) after a 24-hour incubation and the percentage of free 2,4-D in the tissue fell to its lowest p...

The ultrasonic velocity, density and viscosity of some Schiff bases of 4-amino benzoic acid  were measured in 1,4-dioxane and dimethylformamide at 308.15 K. Various acoustical properties such as isentropic compressibility (ks), Rao’s molar sound function (Rm), the Van der Waals constant (b), molar compressibility (W), inter molecular free len...

Free amino acid constituents were determined of grape stem and Phylloxera leaf gall callus in tissue culture. Fast, medium and slow growing single cell clones of, respectively, stem and gall origins were grown on a mineral salt-sucrose medium supplemented with coconut milk and alpha-naphthaleneacetic acid. Stem and gall clones showed qualitative similarities and quantitative variations in the a...

High levels of d-amino acid oxidase activity were found in the kidneys of conventionally reared mice, whereas the enzyme was absent from the kidneys of most germ-free mice. Injection of d-alanine or monocontamination with Bacillus cereus stimulated d-amino acid oxidase activity in the kidneys of germ-free mice.

Variation of plasma free amino acids (PFAAs) is an essential feature of protein metabolic abnormalities in cancer patients. But there still little data about the cancer tissue free amino acid (TFAAs) profiles, including their patterns and correlations with PFAAs. To evaluate the variation in PFAAs and cancer TFAAs in patients with lung cancer, including their patterns and correlations, we inves...

A striking aspect of peptide utilization by bacteria auxotrophic for amino acids is provided by those cases in which peptides promote growth to a greater extent than an equivalent amount of the free essential amino acid that they supply. Kihara and Snell (1) recognized three sets of circumstances that lead to thii result. In Case 1 the free amino acid, but not its peptides, is partially destroy...

abstract           introduction: genetic variations in the gene encoding endothelial nitric oxide synthase (enos) enzyme affect the susceptibility to cardiovascular disease. identification of the way these changes affect enos structure and function in laboratory conditions is difficult and time-consuming. thus, it seems essential to perform bioinformatics studies prior to laboratory studies to ...