Now showing items 1-10 of 32
The stimulation of cerebral N2-methyl- and N22-dimethyl guanine-specific tRNA methyltransferases by methionine sulfoximine: An study
(Elsevier, 1977-06-20)
The administration of a single convulsant dose or of multiple subconvulsant doses of L-methionine-dl-sulfoximine (MSO) to 18-day old rats results in a significant elevation of the specific activity of cerebral tRNA ...
Principle of superposition-free memory
(Elsevier, 1977-07-21)
The requirement that memory be superposition-free imposes a restrictive condition on the structure of neural models. A simple model which satisfies this condition consists of two levels of neurons, with primary level neurons ...
Opposing actions of Ca++ and ATP plus Mg++ in controlling the kynurenine aminotransferase activity of isolated rat kidney mitochondria
(Elsevier, 1977-03-21)
A new method of monitoring changes in the permeability of the mitochondrial inner membrane to substrates, based on mitochondrial kynurenine aminotransferase activity, is applied in this study of a requirement for Ca++ for ...
Dispersal of sweet pignut hickory in a year of low fruit production, and the influence of predation by a curculionid beetle
(Springer-Verlag, 1977-09)
The rate at which fallen hickory nuts are removed from beneath the parent tree, and the effect on this rate of the seed predator Conotrachelus affinis , was studied in an oak-hickory forest in southeastern Michigan, USA, ...
Axon regeneration across the site of injury in the optic nerve of the newt Triturus pyrrhogaster
(Springer-Verlag, 1977-04)
The process by which axons regenerate following a freeze injury to the optic nerve of the newt was analyzed by light and electron microscopy. Freezing destroys cellular constituents in a one millimeter segment of the nerve, ...
DPNH peroxidase: Effector activities of DPN+
(Elsevier, 1977-09-09)
At suboptimal H2O2 concentrations, DPNH inhibits the peroxidase activity of the flavoprotein, DPNH peroxidase, by converting the enzyme to an unstable intermediate that decays slowly to inactive enzyme. It is postulated ...
Transport equations for a microbial predator-prey community
(Springer-Verlag; Springer-Verlag New York Inc., 1977-06)
A transport equation is used which describes the temporal behavior of interacting populations in changing environments. The formulation takes into account the internal state variables of the individuals. The general theory ...
Adenosine deaminase deficiency and severe combined immunodeficiency disease
(Elsevier, 1977-05-15)
The nature of the association of adenosine deaminase deficiency and severe combined immunodeficiency disease is reviewed. The basis for the molecular heterogeneity exhibited by adenosine deaminase in human tissue and the ...
Amino-terminal sequence of phenobarbital-inducible cytochrome P-450 from rabbit liver microsomes: Similarity to hydrophobic amino-terminal segments of preproteins
(Elsevier, 1977-08-08)
SummaryThe amino-terminal sequence of two electrophoretically homogeneous forms of rabbit liver microsomal cytochrome P-450, P-450LM2 and P-45LM4, has been examined by automated Edman degradation. Methionine is the amino ...
Development of a photosynthesis model with an emphasis on ecological applications
(Springer-Verlag, 1977-09)
A theoretical description of the simultaneous processes of photosynthesis and photorespiration in a single leaf is developed, based on the hypothesis that carbon dioxide and oxygen compete for the active site of ribulose ...