Now showing items 31-40 of 44
Evolutionary conservation of DNA coding for maternal RNA in sea urchins
(Elsevier, 1984-08-30)
The extent of evolutionary conservation of DNA complimentary to RNA stored in the mature oocyte of the sea urchin has been assessed. To do this, such DNA was hybridized with total genomic DNA of and and the thermal ...
The kinetics and feedback inhibition of cytidine 5′-triphosphate synthetase in wild-type and mutant Chinese hamster cells
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1984-08)
The kinetics and cytidine 5′-triphosphate (CTP) feedback inhibition of CTP synthetase in wild-type and four mutants of Chinese hamster V79 cells have been studied. The enzymes of the wild type and three of the four mutants ...
Uptake of inorganic nitrogen and seaweed surface area: Volume ratios
(Elsevier, 1984-08)
Surge uptake of ammonium and nitrate by four intertidal seaweed species was examined under standard conditions (16.5 or 20[deg]C, 72 [mu]E m-2 s-1), at both subsaturating and saturating initial nutrient concentrations. ...
Acetylcholine turnover in an autoactive molluscan neuron
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1984-03)
1. We have studied acetylcholine (ACh) turnover at the cholinergic synapse between an identified motoneuron, the salivary burster (SB), and the muscle cells of the salivary duct (SD) in the terrestrial mollusk Limax maximus.
Pleiotropic mutants of Chinese hamster cells with altered cytidine 5′-triphosphate synthetase
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1984-08)
Following chemical mutagenesis and multiple-step indirect selection, four clones of Chinese hamster V79 cells were isolated which exhibited auxotrophy for thymidine, deoxycytidine, or deoxyuridine but not for cytidine or ...
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 ...