Now showing items 21-30 of 293
Photosystem II -- Mediated cyclic photophosphorylation
(Elsevier, 1976-02-09)
DCMU-sensitive synthesis of ATP can be shown to continue in KCN-treated chloroplasts after cessation of O2 evolution. The catalyst for this reaction, -phenylenediamine, also stimulates synthesis of ATP in NH2OH-treated ...
Cadmium metabolism in cdm/cdm mice
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1979-08)
The uptake and metabolism of cadmium by cadmium-susceptible ( +/+ ) and cadmium-resistant (cdm/cdm) strains of mice have been compared. These strains did not differ with respect to the quantitative uptake of cadmium into ...
Citrulline metabolism in normal and citrullinemic human lymphocyte lines
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1975-08)
Citrullinemia is one of the five aminoacidurias associated with the Krebs-Henseleit urea cycle. A long-term lymphocyte line (UM-21) derived from a patient with this disease and nine of ten clones of this line were found ...
Unstable electron pairing and the energy loan model of enzyme catalysis
(Elsevier, 1979-07-21)
A theory of enzyme catalysis is described which utilizes a thermodynamically consistent construction of a free energy diagram with different pathways for complex formation and decomposition. The switch to the decomposition ...
Analysis of selection in populations observed over a sequence of consecutive generations
(Springer-Verlag, 1974-01)
A statistical model is presented for dealing with genotypic frequency data obtained from a single population observed over a run of consecutive generations. This model takes into account possible correlations that exist ...
Effects of hypoxia on the distribution of calcium in arterial smooth muscle cells of rats and swine
(Springer-Verlag, 1975-03)
Exposure to hypoxia caused an increase in the hematocrit and right heart weight of experimental rats, but did not affect calcium-45 uptake by pulmonary arterial smooth muscle cells. However, autoradiographic studies showed ...
Inverse relationship between galactokinase activity and 2-deoxygalactose resistance in Chinese hamster ovary cells
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1978-11)
Galactokinase activity is reduced in 12 independent clones of Chinese hamster ovary cells resistant to 2-deoxygalactose. The frequency of resistant colonies is increased with chemical mutagens. The resistant phenotype is ...
The epidermis and sensory organs of Dugesia tigrina (Turbellaria: Tricladida)
(Springer-Verlag, 1978-10)
The epidermis of D. tigrina was examined using the scanning electron microscope. Both dorsal and ventral surfaces are extremely irregular in contour, as well as being permeated by large numbers of pores. Cilia are restricted ...
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 ...
The location of highly repetitious DNA in the somatic chromosomes of Drosophila melanogaster
(Springer-Verlag, 1978-01)
In situ hybridization of Drosophila melanogaster somatic chromosomes has been used to demonstrate the near exact correspondence between the location of highly repetitious DNA and classically defined constitutive heterochromatin. ...