Nematodes and their role in the meiobenthos : Nematody i ikh rol v meiobentose / T. A. Platonova and V. V. Galtsova.

Gal'tsova, V. V.; Platonova, T. A.

doi:10.5962/bhl.title.46345

Cited by 19 publications

(39 citation statements)

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“…This is necessary for maintaining adequate rates of catalysis, high level of regulatory responsiveness and other characteristics of the whole cell medium (35). Although, changes in pH particularly affect glycolysis: at more alkaline pH, glyceraldehyde-3-phosphate dehydrogenase and phosphoglycerate kinase reactions may become the rate-limiting steps of glycolysis (36).…”

Section: Cellular Regulation Of Protein-protein Associationmentioning

confidence: 99%

Activating oligomerization as intermediate level of signal transduction: analysis of protein-protein contacts and active sites in several glycolytic enzymes

Torshin¹

1999

Front Biosci

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Section: Cellular Regulation Of Protein-protein Associationmentioning

confidence: 99%

Activating oligomerization as intermediate level of signal transduction: analysis of protein-protein contacts and active sites in several glycolytic enzymes

Torshin¹

1999

Front Biosci

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“…The experimental absorption spectrum of QZ is shown in Figure 2. The portion of the spectrum above 25,000cm-' appears qualitatively similar to that of AQ, and polarized absorption measurements [20,36] have been interpreted in terms of the presence of three transitions as shown in the figure, polarized similarly to those of AQ. However, in contrast to AQ, these is an intense, y-polarized visible absorption band in the QZ spectrum, which has been characterized as a chargetransfer band from solvent effects studies [37,38].…”

Section: Substituted Anthraquinones: Qz and Daaqmentioning

confidence: 67%

Ab initio quantum‐mechanical characterization of the electronic states of anthraquinone, quinizarin, and 1,4‐diamino anthraquinone

Petke

Butler

Maggiora

1985

Int J of Quantum Chemistry

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The ground and excited singlet and triplet states of 9,lO-anthraquinone and its 1,4-dihydroxy and 1,4-diamino derivatives are investigated by ab initio configuration interaction calculations, using a floating Gaussian basis. For anthraquinone the calculated electronic absorption spectrum is consistent with previous experimental and theoretical results. The possible mechanisms of S , -T, intersystem crossing and intensity borrowing in phosphorescence are discussed in terms of first-and second-order spin-orbit and vibronic perturbations of the computed singlet and triplet states. The calculated spectra of the 1,4-disubstituted derivatives are more complex than previously suggested from low-resolution polarized absorption studies. The principal effect of 1,4-substitution by electron donating groups is shown to be a powerful conjugative effect which significantly modifies selected molecular orbitals of anthraquinone; the resultant effect on the absorption spectra is the creation of two new substituentinduced n + n* transitions, one of which corresponds to the intense.visible absorption band of these systems.

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“…An exoeffect that was due to pre-crystallization of the compound from a part of its amorphous state was observed between these two peaks for several batches of aromatic amine if the starting compounds and decomposition products from the loss of moisture contained a small amount of crystal-hydrate forms. The existence of polymorphic forms in the crystalline state was reported earlier [2,3]. It was thought that DAPBI existed in several crystalline forms and was also capable of forming crystal-hydrates that were identified by separate endothermic effects with peaks at 125 and 135°C.…”

mentioning

confidence: 89%

Thermographic analysis of monomers in the production of threads from aromatic polyamides

2012

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OAO Kamenskvolokno is a domestic industrial manufacturer of aramid threads. Specialists of the firm pay special attention to analytical production control at all stages, from starting material analysis, at intermediate synthetic steps of the aromatic copolyamide, to release of the final product, in order to improve the production process. Special attention is paid to the purity of the diamines and aromatic acid anhydrides. The monomers for manufacture of aramid threads are aromatic diamines [1] 5(6)-amino-2-(p-aminophenyl)benzimidazole (DAPBI) and p-phenylenediamine (PPDA), terephthalylchloride (TPC), isophthalylchloride (IPC), and pyromellitic acid dianhydride (PAD). As a rule, these are crystalline compounds.Herein the analysis of these monomers by differential scanning calorimetry (DSC) methods is examined. This method allows quantitative values of thermodynamic parameters such as melting point and enthalpy of aggregate transitions to be obtained. Measurement of these values enables the degree of purity and the crystallinity of the monomers to be estimated. DSC measures heat fluxes carried to the sample and a reference compound according to a certain program. A temperature difference is measured and used to determine the values of thermal effects corresponding to transitions from the crystal to the liquid state (endoeffect) or upon crystallization from the melt (exoeffect). The uncertainty of the temperature observed at the maximum of thermal effects is less than fractions of a degree in modern DSC instruments.At present, DSC in addition to spectroscopic, chromatographic, and x-ray methods are promoted as basic methods for studying and monitoring materials. Results from DSC studies are represented as the dependence of differential enthalpy on temperature, ΔH/ΔT.The measurement process is usually organized so that the sample and reference receive those portions of heat at which their temperatures would be equal (isothermal regime). This is carried out using two thermoelectric heating elements placed in a paired calorimeter. The temperature is measured alternately in both its measurement cells. If the temperatures of the cells differ, the heating rate is automatically changed so that the temperatures even out.DSC can not only determine the composition of compounds but also measure their thermal characteristics. The sphere of application of the method is very broad, from checking the purity of chemicals to studying crystallization processes of polymers, because chemical reactions are usually accompanied by significant enthalpy changes.

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Nematodes and their role in the meiobenthos : Nematody i ikh rol v meiobentose / T. A. Platonova and V. V. Galtsova.

Cited by 19 publications

References 0 publications

Activating oligomerization as intermediate level of signal transduction: analysis of protein-protein contacts and active sites in several glycolytic enzymes

Activating oligomerization as intermediate level of signal transduction: analysis of protein-protein contacts and active sites in several glycolytic enzymes

Ab initio quantum‐mechanical characterization of the electronic states of anthraquinone, quinizarin, and 1,4‐diamino anthraquinone

Thermographic analysis of monomers in the production of threads from aromatic polyamides

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