Now showing items 51-60 of 62
Time resolved exciton migration in mixed naphthalene crystals: triplet and singlet critical concentrations
(Elsevier, 1979-06-15)
The contrasting temporal characteristics of the triple and singlet transport (below 4 K) correlate with dynamic and quasistatic percolation, respectively. They do not support an Anderson--Mott transition (AMT) for the ...
Methionine transport in S37 cells. Substrate-dependent function of amino acid transport system A in exchange processes
(Elsevier, 1979-06-13)
Methionine had been observed to interact with two principal transport systems for amino acids in mammalian cells, the A and L systems. The present study of methionine transport and of exchange processes through system A ...
Interactions of neomycin with monomolecular films of polyphosphoinositides and other lipids
(Elsevier, 1979-10-19)
The interactions of calcium and the aminoglycosidic antibiotic, neomycin, with various lipids were investigated in monomolecular films. Lipids were spread over a subphase of 0.05 M N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic ...
Relativistically parameterized extended Huckel theory
(Elsevier, 1979-04-01)
A relativistically parameterized extended Huckel molecular orbital method is outlined. One-electron effective hamiltonian matrix elements are related to the corresponding overlap matrix elements calculated in an atomic ...
Short chain ceramides as substrates for glucocerebroside synthetase. Differences between liver and brain enzymes
(Elsevier, 1979-04-27)
In order to increase the sensitivity of the assay for ceramide: UDPGlc glucosyltransferase, the enzyme that makes glucocerebroside, we synthesized a variety of ceramide homologues that might be better substrates than the ...
Enzyme changes associated with mitochondrial malic enzyme deficiency in mice
(Elsevier, 1979-10-18)
A genetically determined absence of mitochondrial malic enzyme (EC 1.1.1.40) in c3H/c6H mice is accompanied by a four-fold increase in liver glucose-6-phosphate dehydrogenase and a two-fold increase for 6-phosphogluconate ...
Low-temperature heat capacities, thermophysical properties, optical spectra, and analysis of Schottky contributions to Pr(OH)3
(Elsevier, 1979-09)
From values of the heat capacity of microcrystalline Pr(OH)3 determined by precise adiabatic calorimetry from 15 to 350 K, the Schottky contribution associated with all but the lowest Stark level was resolved with the aid ...
Finite nucleus model for the Fermi contact interaction
(John Wiley & Sons, Inc., 1979-01)
A model for the Fermi contact interaction is proposed in which the charge and magnetic moment of the nucleus are uniformly distributed within a sphere of radius r 0 . This leads to a SchrÖdinger equation, which is solvable ...
Steady-state kinetic analyses of Photosystem II activity catalyzed by lipophilic electron acceptors
(Elsevier, 1979-08-14)
Steady-state kinetic analyses of the Photosystem II activity elicited by quinones and quinonediimines in KCN/Hg-inhibited chloroplasts reveal that: 1. 1. Quinones generate a single reaction in which one quinone competes ...
Selective catechol oxidations with diphenyl selenoxide. Applications to phenolic coupling.
(Elsevier, 1979)
Diphenyl selenoxide was used as a mild and selective oxidant in the synthesis of aporphines and homoaporphines. An intramolecular coupling between a phenol and a catechol is believed to proceed catechol selenurane intermediates.