Projective visual imagery as a function of age and deafness.
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Child↗
Biomedical subjects
A D Robertson
Publications and source records attributed to A D Robertson.
Anticipatory visual imagery in deaf and hearing children.
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Age Factors↗
Correlation between unit activity and slow potential changes in the unanaesthetized cerebral cortex of the cat.
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Animals↗
Prolonged excitation in the visual cortex of the cat.
Intense light flashes produce maintained increased in cortical activity not dependent on continuous excitation from the retina.
Animals↗
Identification of the V factor needed for synthesis of the iron-molybdenum cofactor of nitrogenase as homocitrate.
Nitrogenase catalyses the ATP-dependent reduction of N2 to NH3, and is composed of two proteins, dinitrogenase (MoFe protein or component I) and dinitrogenase reductase (Fe protein or component II). Dinitrogenase contains a unique prosthetic group (iron-molybdenum cofactor, FeMoco) comprised of Fe, Mo and S, which has been proposed as the site of N2 reduction. Biochemical and genetic studies of Nif- (nitrogen fixation) mutants of Klebsiella pneumoniae which are defective in nitrogen fixation, have shown that the nifB, nifQ, nifN, nifE and nifV genes are required for the biosynthesis of FeMo-co. Recently, a system for in vitro synthesis of FeMoco was described. The assay requires at least the nifB, nifN and nifE gene products, and a low-molecular-weight factor (V factor) produced in the presence of the nifV gene product. We have used this system to study FeMoco biosynthesis. We report here the isolation of V factor and identify it as homocitric acid ([R]2-hydroxy-1,2,4-butanetricarboxylic acid).
Ferredoxins↗