Now showing items 41-49 of 49
Surfactants: their role in preventing the precipitation of proteins by tannins in insect guts
(Springer-Verlag, 1984-03)
Much more tannic acid or pin oak tannin is required to precipitate the abundant leaf protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), from Manduca sexta gut fluid adjusted to pH 6.5 than is required to ...
Anion sensitivity of motility and step-down photophobic responses of Euglena gracilis
(Springer-Verlag, 1984-08)
The motility and step-down photophobic responses of Euglena are influenced by inorganic and organic anions. Persistent motility (with Ca 2+ , Mg 2+ and K + present) is supported with chloride or sulfate but not with acetate, ...
Snowshoe hare optimal foraging and its implications for population dynamics
(Elsevier, 1984-06)
The results of an optimal foraging model using linear programming with constraints for feeding time, digestive capacity, sodium requirements, and energy requirements indicate that snowshoe hare (Lepus americanus) may forage ...
Optimal avoidance and evasion tactics in predator-prey interactions
(Elsevier, 1984-01-21)
A kinematic analysis of optimal avoidance and evasion techniques for prey is presented. The analysis is mainly directed towards piscivorous interactions but can include other aquatic and terrestrial cases. Avoidance is ...
Prostaglandin biosynthesis does not participate in isoproterenol-induced renin release
(Elsevier, 1984-05-07)
Rat renal slices were incubated in two different media. One was a normal K. physiological saline solution and the other a high K medium. Renin release was measured every 15 min in the presence and absence of 10-6M isoproterenol ...
Regulation of LH beta subunit mRNA in the sheep pituitary gland during different feedback states of estradiol
(Elsevier, 1984-08-16)
The feedback effects of gonadal steroids on the amounts of translated luteinizing hormone (LH) beta subunit were examined using cell-free assays. These amounts were then correlated with serum and pituitary concentrations ...
Growth conditions of F9 embryonal carcinoma cells affect the degree of DNA methylation
(Kluwer Academic Publishers; Dr W. Junk Publishers ; Springer Science+Business Media, 1984-12)
We have investigated differences in C * pG methylation between F9 embryonal carcinoma cells in vitro and as tumor cells grown in vivo using Msp I and Hpa II restriction isoschizomers. Southerns were hybridized with two low ...
Moose and snowshoe hare competition and a mechanistic explanation from foraging theory
(Springer-Verlag, 1984-02)
Moose ( Alces alces ) and snowshoe hare ( Lepus americanus ) appear to compete with each other. This was determined using the “natural experiments” of populations found in sympatry and allopatry on islands at Isle Royale ...
Affinity isolation of RNA polymerase II on amanitin-Sepharose
(Elsevier, 1984-02-29)
We report here the first case of an affinity isolation of eukaryotic RNA polymerase II. The procedure employs an affinity matrix composed of [alpha]-amanitin coupled to Sepharose 4B via a ten atom spacer. RNA polymerase ...