Now showing items 21-30 of 33
Abundance and diaspore weight in rare and common prairie grasses
(Springer-Verlag, 1978-01)
Abundance (g/m 2 ) and diaspore weight are positively correlated in seven species of perennial grasses that occur in prairies. The rare grasses (<10.0 g/m 2 ) have light dispersal units (0.06 to 1.76 mg); the common grasses ...
Association between cholesterol and 2,3-diphosphoglycerate in genetically selected hooded rat lines
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1978-02)
We have developed two strains of hooded rats with differing erythrocyte oxygen affinities by selection on red cell 2,3-diphosphoglycerate levels. Genetic studies have shown that these strains differ at one DPG-level-determining ...
Seasonal acclimatization to temperature in cardueline finches
(Springer-Verlag, 1978-06)
1. Seasonal variation in body constituents and utilization of lipid, protein, and carbohydrate during cold stress in American goldfinches were studied to determine relations of these functions to the pronounced seasonal ...
Resource utilization and coexistence of three species of Pogonomyrmex ants in an Upper Sonoran Grassland Community
(Springer-Verlag, 1978-01)
In an Upper Sonoran Grassland Community, three species of Pogonomyrmex ants coexist. Due to the similarity in their diets and the apparent limitation of food, coexistence is aided by the differential utilization of the ...
LH biosynthesis and secretion in rat anterior pituitary cell cultures: Stimulation of LH glycosylation and secretion by GNRH and an agonistic analogue and blockade by an antagonistic analogue
(Elsevier, 1978-02-14)
In rat anterior pituitary cell cultures GnRH (1nM) stimulated a progressive increase in LH release into the medium from 1 to 8 h of incubation, while cellular LH showed a corresponding decrease. GnRH (1nM) neither modified ...
Thermal inactivation differences of phosphofructokinase in erythrocytes from genetically selected high and low DPG rat strains
(Elsevier, 1978-08-29)
Phosphofructokinase (PFK) has been previously suggested as being responsible for the differences in glycolytic 2,3-diphosphoglycerate (DPG) levels in two inbred populations of Long-Evans hooded rats. The enzyme's activity ...
EcoRI analysis of bacteriophage P22 DNA packaging
(Elsevier, 1978-01-25)
Bacteriophage P22 linear DNA molecules are a set of circularly permuted sequences with ends located in a limited region of the physical map. This mature form of the viral chromosome is cut in headful lengths from a ...
Association in Long-Evans hooded rats of red cell 2,3-diphosphoglycerate levels with hemoglobin types
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1978-08)
Two sublines of commercially available Long-Evans hooded rats have been developed by genetic selection. These sublines have widely differing levels of erythrocyte 2,3-diphosphoglycerate (DPG) due to different alleles at a ...
Sensitivity of transcription by purified RNA polymerase to actinomycin
(Elsevier, 1978-10-30)
DNA-dependent RNA polymerase has been purified 400-fold from 48 hr old, actinomycin producing cells of . Sodium dodecyl sulfate polyacrylamide gel electrophoresis of the purified polymerase reveals the presence of bands ...
Exciton percolation III. Stochastic and coherent migration in binary and ternary random lattices
(Elsevier, 1978-07-20)
We develop a method for calculating energy migration in random heterogeneous aggregates, with potential application to the primary process in photosynthetic units. A Monte Carlo technique is employed to study several types ...