Studia Universitatis Moldaviae. Stiinte reale si ale naturii

3-9

Authors: Valentina BULIMAGA, Liliana ZOSIM, Maria PISOVA, Valeriu RUDIC* , Sergiu ŞOVA

Spirulina productivity and iron content in biomass recorded higher values at light intensity 5500 lx, compared to 3500 lx, but phycobiliproteins accumulation in spirulina biomass was more significant at 3500 lx. The content of the accumulated selenium in the phycobiliproteins registered the increased values with the increasing of selenite concentra¬tion, attesting its maximum value at 45 mg/l, at the both light intensity. Selenium content in the phycobiliproteins at 3500 lx was by 1.4-1.5 times higher, compared to that registered at 5500 lx.

16-20

Authors: Angela RUDAKOVA., Valentina BULIMAGA, Maria PISOVA, Veaceslav REVA, Natalia CLIMOVA, Sergiu RUDAKOV, Liliana ZOSIM

A comparative evaluation of papain and trypsin hydrolysates of phycocyanin and Se-phycocyanin after separation by HPLC with reverse phase on the ResourceTMRPC column was performed.The chromatographic profile of peptides from the trypsin and papain hydrolysates of phycocyanin at separation by gel filtration on Sephadex G-50 column was analyzed. UV-VIS spectra of peptides fractions obtained by gel filtration separation of phycocyanin hydrolysates revealed the presence of chromopeptides.

25-28

Authors: Galina DOBROJAN

This article reflects a systematization of the results presented in the literature in the field. The research approaches genus Anabaenopsis by studying history, systematic changes, highlighting the number of species and taxa of algae that are assigned of genre and some specific morphological characteristics.

34-38

Authors: Maria DUCA, Angela PORT, Steliana CLAPCO, Adriana ACCIU

The researches both from the scientific publications and three projects included in public databases: Angiosperm Phylogeny Website, version 13, Parasitic Plant Connection, Parasitic Plant Genome Project have been analysed and some correlation between degree of parasitism and genome evolution of Orobancheae have been highlighted. It has been concluded that number of chromosomes, presence of introns, deletion of some regions of plastid genome, provides useful information for studying of genome evolution mechanisms, specific taxonomic affiliations etc.

44-51

Authors: Maria MAGHER

Fire blight, a bacteriosis of fruit-trees and other rosaceous plants, can be a disastrous disease in orchards and is therefore of great economic importance. Many symptoms of fire blight can be seen during short time after infection. Using special microbiological media this pathogenic bacterium has been isolated from samples of infected apple, quince and apple trees. Inoculation tests confirmed its pathogenicity and virulence to host plants.

58-64

Authors: Алла ДОНОС, Светлана ГАРАЕВА, Анна ЛЕОРДА, Влада ФУРДУЙ, Галина ПОСТОЛАТИ, Галина РЕДКОЗУБОВА

The paper highlights the community-acquired children’s pneumonia and recurrent respiratory infections mechanisms of influence in the exchange of free amino acids serum, and shows the qualitative and quantitative amino acid modifications influence in the morphology and function of tissues and organs.

70-75

Authors: Constanţa MADAN

The research purpose is to study and reveal the structure of sexual offenses against minors in Moldova with obvious psychiatric consequences. 100 cases of sexual offenses against children examined at Clincal Department of Forensic Medical Center and at the Archive of the Psychiatric Hospital from Moldova were studied, during the period of 2010-2015. It was established the impact of the sexual abuse to minors according by some points, using an annex statistics.

83-90

Authors: Dumitru BULAT, Denis BULAT, Ion TODERAŞ, Nina FULGA

Under the intensification of anthropogenic pressure in aquatic ecosystems of Republic of Moldova, most of stenobionte species became threatened with extinction, but some species, potentially high adaptive, contrast, in present demonstrates an evident biological progression, in some hydrobiotops causing a stressed invasive effect. For Dniester River (limits of Republic of Moldova) three-spined stickleback – Gasterosteus aculeatus Linnaeus, 1758 is a good example, after the construction of Novodnestrovsk hydropower (1981) became a multidominate species forming to Soroca city a particularly large local population. In this paper are analyzed bio- ecological peculiarities of three-spined stickleback and are highlighted environmental factors that contributed to taxon invasion in Dniester River (limits of Republic of Moldova).

108-113

Authors: Ho Anh TUAN

Analysis and identification of 42 specimens of family Terapontidae collected from Gianh estuary and Gianh downstream in Quang Binh province in north center region Vietnam. We have classified four species: Terapon jarbua (Forsskål, 1775); Helotes sexlineatus (Quoy & Gaimard, 1825); Rhyncopelates oxyrhynchus (Temminck and Schlegel, 1842); Pelates quadrilineatus (Bloch, 1790). Species Rhyncopelates oxyrhynchus (Temminck and Schlegel, 1842) was first discovered in Gianh estuary and Gianh downstream in Quang Binh province in north center region Vietnam.

121-125

Authors: Viorica GLADCHI, Nelli GOREACEVA, Elena BUNDUCHI

In this paper it is presented the results of the multiannual study of the temporal and spatial variations of the organic substances (O.S.) in the Dniester waters on the portion Naslavcea village - accumulation tank from Dubasari. After peculiarities of the regime formation of the Middle Dniester, are highlighted two portions of the river, which differ in content and type of S.O., as well in the degree of pollution of the Dniester waters.

133-141

Authors: Angela LIS

It was studied direct photolysis in aqueous solutions of the thiourea and cysteine on the model system in order to estimate their role in the processes arising in the natural waters. It has been found that both of them, thiourea and cysteine, have been subjected to direct photolysis at irradiation with different artificial light sources. From the results obtained it was found that oxidation rate of these thiols depends directly proportional to the initial concentration of thiol in the system and the emission spectrum of the lamp. There were determined quantum yields of thiourea and cysteine using chemical actinometer K3[Fe(C2O4)3] · 3H2O. It was found that the quantum yield of thiourea is much greater than unity, which shows that on the destruction of thiourea only at the initial stage occurs photochemical reaction, which is followed by chemical reactions, possibly radical reactions, so thiourea can be the initiator of chemical self-purification reactions in the natural waters.

153-157

Authors: Gheorghi NICULIŢA

The presented data confirm the fact that the human society has become one of the factors forming the environment quality. Urban media differ in the ways they influence upon adjacent natural ecosystems. All of them are oriented so as to achieve an ecologic equilibrium that would combine decent living conditions for people from the one hand and a “healthy” environment from the other hand.

164-169

Authors: Ion TODERAŞ, Aurelian GULEA, Elena ROŞCOV, Olga GARBUZ

This work will focus on the study of groups of metalloorganic substances on aquatic organisms. Toxicological testing method of coordination compounds CMT-28 and CMA-18 is used on Paramecium caudatum Ehrnbg ciliates, at concentrations of 100, 10, 1, 0,1, 0,01 uM/L, compared to the prototype. Bioassay method allows us to develop fast and comparative conclusions, avoiding a high risk of errors. The investigation of metalloorganic compounds was performed by the method of serial dilutions in the liquid nutrient medium (1 g nutrient solution / 1l water). As a reference cultures were used ciliates Paramecium caudatum. Infusorians, as objects of research are very comfortable, they reproduce quickly enough, being the most convenient test-objects for study in the laboratory conditions, because of time factor which plays a decisive role and also is more simple to elucidate the impact of abiotic factors (metalloorganic substances) on the process of asexual reproduction of Paramecium caudatum. The activity of substances was evaluated according to the character of the toxicity of the preparations (LT50 and LC50), while the activity of ciliates was studied according to the character of viability and reproductive parameters (increasing or decreasing of numbers and their reproductive rate). The acute toxicity study (LC50 and LT50) of the compounds was performed according to the methodical recommendations on overall toxicity of pharmaceutical remedies. LC50 (lethal concentration, 50%) – concentration which causes death of 50% of test-organisms in a given period of time. LT50 (lethal time, 50%) – time, during which the used concentration of the test compound causes the death of 50% of the test organisms.

178-184

Authors: Tatiana PALAMARCIUC, Angela SÎRBU, Oleg PALAMARCIUC

The synthesis, crystallographic and magnetic studies of Fe(III) compounds with 4-phenylthiosemicarbazone and 4-phe¬nylthiosemicarbazone 2-acetylpyridine are presented. The spectrophotometric studies in solution were realized for Fe(II) ions with the same ligands. The coordination compounds [Fe(L1)2]BF4•CH3OH (1) and [Fe(L2)2]FeCl4 (2) were obtained from alcoholic solutions. Crystallographic studies reveal that the methylation of sulfur atom influence the coordination set on the Fe(III) ion. Compounds 1 and 2 shows different magnetic properties in function of temperature.

189-194

Authors: Roman RUSNAC, Anna RUSNAC, Olga GARBUZ, Nicanor BARBĂ, Aurelian GULEA

In this paper are described methods of synthesis of six organic compounds, were three of then are unknown. The structure of the compounds was determined by NMR spectroscopy 1H, 13C and IR spectra. Anticancer activity was studied using cervical cancer cells HeLa, where the compound N-[4-({2-[1-(pyridine-2-yl)ethylidene]hidrazincarbotioil}amino)phenyl] acetamide showed the highest inhibition, about 84% at concentration of 100 μM/L.

204-213

Authors: Vasile RUSU

It was developed the criterion for delimiting of characteristics for electric double layer (EDL) close to the basal surface and edge surface of pillared Al-montmorillonite, and the EDL characteristics in the Stern model were determined. Depending on the case, for EDL close to the basal surface or edge surface, the main characteristics of Stern layer can be estimated, i.e. the Stern potential , chemical specific adsorption energy Ø and charge density c.