Vol. 38 No. 3 (205) (2004)

The interaction of palladium(II) with thiourea and phenylthiourea has been studied using spectrophotometric method. Optimal conditions for this interaction have been estimated medium acidity, the range of Submittance to the photometry main law). The composition of compounds formed in the system has been determined by means of the two methods: molar ratio and equilibrium Shift methods. Some methods have been elaborated for spectrophotometric determination of palladium in the galvanic electrolyte.

Possibility of rhenium determination in different rhenium-containing objects by amperometric titration method using some organic basic dyes as analytical reagents (Rhodamine G, Rhodamine 6G, Safranine T) has been shown. Titrations have been carried out in 0.8–1.0 M phosphoric acid medium on the platinum indicating microelectrode at +l.4 V (Rhodamine G, Rhodamine 6G) and 0.0 V (Safranine T) potentials. Solubility products values for compounds forming during interaction between perrhenate-ions and cations of the mentioned organic basic dyes (as well as Crystal Violet and Methyl Violet) have been calculated by means of two independent methods (photometric and gravimetric).

New methods for the synthesis of the chiral reagents (S)-N-(2-benzoylphenyl)-l-(3,4-dichlorbenzyl)pirrolydin-2-carboxamide (CPB) and (S)-N-(2-(2',5'-dimethylphenyl)benzoyl)-1-benzylpirrolydin-2-carboxamide (BBX) and their chiral Ni²⁺ complexes of Schifts bases with dehydroalanine (Ni-CPB-Δ-Ala and Ni-BBX-Δ-Ala) has been elaborated. All the complexes derived from BBX are formed as atropoisomers. These atropoisomers were isolated and subjected to spectral analysis.

A new method for asymmetric synthesis of (S)-vinylglycine via nucleophile addition of benzylamine to C=C bond of dehydroaminobutanoic acid in Ni(ll) complex of Schiffs base with a chiral auxiliare (S)-N-(2-benzoylphenyI)-l-(3,4- dichlorbenzyl)pyrrolydin-2-carboxamide has been elaborated. After decomposition of the reaction mixture amino acid (S)-vinylglycine has been isolated with ee 48%.

For an evaluation of a functional state of the photosynthetic apparatus investigated the effect of high temperatures on pigments system Chlorella pyrenoidosa. It is established, that under action of temperatures the contents of pigments decreases. Chlorophyll a and carotenoids are more sensitive. Concentration of chlorophyll b changes insignificantly, that testifies the stability of lightharvesting complex LHC (in fact all chlorophyll b is in LHC).

Activation of proline oxidaze (PO) and pirolin-5-caroxilate-dehidrogenaze (P5KD) in the organs of Salmo ischchan has been investigated. In comparison with other organs high activity of the enzymes has been found in the heart of fish. The activity of proline degradation enzymes in kidney increases 13 times during laying of hardroe of the females and in the kidney of the male – 3.5 times. Citrate stimulates the activity of PO and P5KD in all organs, except the gills and the heart. The complex of citrate and ATP in liver stimulates the activity of the mentioned enzymes over 4 times.

The analysis of investigated exponents has revealed a deeper effect of examination stress on specialized school pupils’ health conditions. Increase of central regulation mechanisms’ activity was revealed in conditions of examination tension loading of sympathetic nervous system. The pupils, who have sympathotonic regulation, have formed a «risk» group and have more changes in integral exponents of heart rhythm regulation.

In the normal as well as in the oxygen deficiency conditions research has been made to study the influence of CA₁ area of hippocampus on impulse activity of respiratory neurons of medulla oblongata. In conditions of normal atmospheric pressure the electrical stimulation of CA₁ area has had mainly inhibiting influence. In the initial phase, on 4–5 thousand meter altitude, activation of frequent discharge of neurons occurred. In this situation the inhibiting influence of stimulation of CA₁ area of hippocampus was more accentuated than in conditions of normoxia. In the second phase, 7.5–8 thousand meters on the reduction of the impulse activity of neurons, stimulation of CA₁ area induced uncharacteristic reactions of those neurons.

As a result of the resarches in Armenia there have been found 92 species belonging to genus Ascochyta. In the list included in the article besides the latin names of the species there are also pointed the authors, the names of the host plants, the places of collection and the dates.

Primary and late stages of embryogenesis of grapes Mskhali, Shahumyani, Deghin Yerevani, Parvana and Charentsi sorts were studied considering the crop capacity and the economic significance. Success of selection work is conditioned by the right choice of parental forms. The sterilization of the pollens of the mentioned sorts is the result of vegetative and generative seeds’ early degeneration in the cell of plasma. In barren sorts pollination and fecundation are possible, bit normal fertility lads, because of normal course of embryogenesis. In the result of sterilization fruits of grapes are barren and economical, it's a normal phenomenon and grains cither don't develop, but decay during the process of development or remain undeveloped The reason that grapes are barren can be also considered as abnormal development of reproductive organs, early destruction of female cells gametophase. In the sorts of Deghin Erevani, Parvana decay of buds takes place in the late stages of development, the result of which formed fruits can have undeveloped grains. The reason of grapes falling can be the alterations taking place in the system of female genitals.

The corrosive stability of lead-silver and lead-antimony insoluble anodes in sulfuric acid solutions have been investigated. A definite difference between the structures and properties of these anodes have been carried out. The phase layers of lead-silver c possess the best protective properties. It’s shown that the corrosive stability of these anodes can be additionally increased by modification of crystal structure of phase layer.

Interaction of phenylglicidil ether with amino acids is investigated namely with N-phenylanthranilic, hydrochloride anthraniiic acids, and also with hydrochloride of a methyl ester leucine and glycine.

The character of a laying of embryonic floscules and zones of fruiting of sprouts in many sorts of grapes of various origin was studied. In contrast to the sorts of European origin, such as Amour-European and American-European forms revealed high ability of a laying of embryonic floscules in spare and central kidneys of eyes for almost on all the length of sprout. Such a feature positively influences on accelerated testoration and formation of a crop after influence of extreme conditions.