Results 241 to 250 of about 6,276,987 (290)

Fluorescence studies of the photosynthetic induction period

Biochimica et Biophysica Acta (BBA) - Specialized Section on Biophysical Subjects, 1964
Abstract The fluorescence intensity of green leaves at the beginning of an irradiation period is lower than at the subsequent steady state of illumination. This is interpreted in terms of the adsorption in the dark of plant metabolites at an active chlorophyll surface and of their photochemical reduction in the first few seconds of strong irradiation.
J L, ROSENBERG, T, BIGAT, S, DEJAEGERE
openaire   +2 more sources

The Induction Period in Physical Development

The Journal of Photographic Science, 1976
AbstractThe early stages of pure physical development were studied under conditions of constant pAg and in the presence of additives known to influence the "induction period” in chemical development. It appears that the rate of pure physical development is markedly dependent on the nucleus charge and on the charge on the developing agent, at least for ...
G.I.P. Levenson, P.J.P. Twist
openaire   +1 more source

Induction periods

Journal of Thermal Analysis and Calorimetry, 2006
Methods for kinetic description of induction periods, based on the single-step kinetics approximation and various expressions of the temperature functions, are presented. The formulas for evaluation of both isothermal and non-isothermal lengths of induction periods are derived.
openaire   +1 more source

The Induction Period in Development

The Journal of Photographic Science, 1975
AbstractSince Ihe exposure-dependent induction periods controlling the developmenl of individual grains in an emulsion and induction periods derived from the overall kinetics of development depend upon different experimental faclors and arc not necessarily connected, they should be called different names.
openaire   +1 more source

Induction period in the aging of polypropylene

Journal of Applied Polymer Science, 1965
AbstractThe ordinary methods for obtaining a rapid estimate of the useful life of a plastic, extrapolations from tests conducted at higher temperatures or at lower stabilizer concentrations than those of actual use, lead to serious errors in estimating the useful life of some stabilized polypropylene compositions.
J. W. Tamblyn, G. C. Newland
openaire   +1 more source

Inductive inference of ultimately periodic sequences

BIT, 1988
An algorithm is presented for inductive inference of ultimately periodic sequences. It can be implemented in linear time and space.
openaire   +2 more sources

Interpretation of crystallization induction periods

Journal of Colloid and Interface Science, 1988
The crystallization induction period tind, is interpreted as the sum of the time for critical nucleus formation, tn, and growth to detectable size, tg. Expressions describing the dependence of tind on supersaturation are derived for the cases tn ⪢ tg, tn ≈ tg, and tn ⪡ tg, taking into account different possible nucleation and growth mechanisms, and ...
Otakar Söhnel, John W Mullin
openaire   +1 more source

An induction period in the pyrolysis of acetylene

Physical Chemistry Chemical Physics, 2001
Acetylene was pyrolysed in a flow system between 854 and 970 K, at pressures between 27 and 127 Torr and at residence times between 8 and 1520 ms. Both vinylacetylene and benzene were observed to be primary products, but secondary processes removed vinylacetylene and formed benzene.
Xuejun Xu, Philip D. Pacey
openaire   +1 more source

Kinetics of the induction of DNA synthesis in lymphocytes by periodate

Experimental Cell Research, 1976
Abstract Treatment of lymphocytes with NaIO4 introduces aldehyde moieties on surface sialyl residues and induces extensive blastogenesis. Cysteine, a compound which reacts with aldehydes through its amino and thiol groups to form a thiazolidine derivative, was found to inhibit transformation of NaIO4-treated mouse lymphocytes.
A, Ravid, A, Novogrodsky
openaire   +2 more sources

Theory of long induction periods

Journal of Crystal Growth, 1987
Abstract Current theories relating induction periods in crystallization to either stationary nucleation rate or relaxation time of embryo distribution are of limited validity. The Zeldovich-Frenkel theory overestimates the growth rate of postcritical embryos with high surface energy.
openaire   +1 more source