Studia Universitatis Moldaviae. Stiinte reale si ale naturii

03-08

Authors: Valentina BULIMAGA, Liliana ZOSIM, Daniela ELENCIUC

The effects of chromium glycinate and lighting regime on spirulina productivity and chromium accumula¬tion in biomass were studied. The stimulatory effect of coordination compound [Cr(Gly)3]Cl (5-30 mg/l) on productivity of spirulina, grown in both lighting regime: continuous and with photoperiod 14/10 hours, as well as chromium accumulation in biomass were established.

15-20

Authors: Angela RUDAKOVA, Andrei SHUTOV, Serghei RUDACOV, Valentina BULIMAGA, Natalia CLIMOVA, Irina KAHOVSKAIA, Maria PISOVA

The elaboration of the procedures of obtaining of bioactive peptides derived from phycocyanin, as a result of it proteolytic hydrolysis presents great interest for researchers in the terms of theirs use as anti-cancer drugs and for other therapeutic properties. It can be assumed that peptides derived from phycocyanin could manifest more pronounced therapeutic effects compared to phycocyanin. Dynamics of phycocyanin proteolisis by papain, as well as mechanism of phycocyanin hydrolysis were studied in the present work.

25-32

Authors: Victor COVALIOV, Valentin BOBEICĂ, Olga COVALIOVA

The combined application of a series of new approaches, including chemical stimulation of methanogenesis, intro¬duction of the compounds precursors of vitamin B12, recirculating of CO2 and adding of H2, have led to the 1,5-2 times enrichment with vitamin B12 of the sludge resulted from anaerob-digestive treatment of post-distillery vinasse. As a result, the quality improvement of vitaminized forage concentrate was reached, at the same time with the intensification of biomethane production, thus enhancing the ecologico-economic efficiency of the vinasse anaerobic treatment. A part of cobalamin is adsorbed on the particles of the forming sludge, whereas the remaining part is subjected to the advanced adsorption treatment on th mineral adsorbent – diatomite. The product formed can be used as a forage additive for cattle and poultry in agriculture.

37-44

Authors: Maria TIMOŞCO, Aliona VELCIU, Victoria BOGDAN

Experimentally in the condition of “in vitro and “in vivo” on laboratory and pattern animals (mice and guinea-pigs) was confirmed the posibility of utilization the microbe preparations CABILAC and ACLOFEM with prophylactic and treatment of the intestinal disorder and diarrhea. In the basis of intensive antagonistic activity at Escherichia, Proteus, Clostridium and Staphylococcus and adhesion capacity advanced, also and results of his tested on animals to be recommended with inculcation in practice.

56-57

Authors: Inga OLARI, Eugeniu DUDNIC, Natalia DUDNIC

All the changes that occur at the level of organs and systems reflected in the composition of the blood, so we chose the study of the action of increased consumption of soybean on the hematological indicators in white laboratory rat.

68-72

Authors: Ştefan RUSU, Dumitru ERHAN, Maria ZAMORNEA, Oleg CHIHAI, Anatol SAVIN, Elena GHERASIM, Galina MELNIC, Vasile BUZA, Mihail PRUTEANU, Tudor ANGHEL

The study on parasitic fauna in wild mammals from natural reservation “Codrii” in Republic of Moldova has revealed the high level of their infestation with fascicles, dicrocelium, strongiles and protista. The red deer (Cervus elaphus Linaeus, 1758) have been infested with Dicrocoelium lanceolatum (12,8%), Fasciola hepatica (9,5%), strongiles larvae (88,0%) and ovocysts of Eimeria spp. (28,2%); the Japanese deer (Cervus nippon Temminsk, 1838) has been infested with D. lanceolatum (14,9%), F. hepatica (10,2%), strongiles larvae (79,8%) and ovocysts of Eimeria spp. (22,4%); roedeer (Capreolus capreolus Linaeus, 1758) – with D. lanceolatum (20,1%), F. hepatica (3,2%), strongiles larvae (89,4%) and ovocysts of Eimeria spp. (38,1%). The wild boar revealed 3,6% level of infestation with Dicrocoelium lanceolatum, larvae of Strongyloides ransomi in 72,3% of cases, Metastrongylus elongatus (87,5%), and Eimeria spp. (46,3%). The jackrabbit revealed 28,2% infestation level with D. lanceolatum and 59,4% level of infestation with Strongyloides papillosus. The high level of parasitic infestation of the wild animals again demonstrates that they play an important role in maintaining the epizootic chain of these diseases and also have crucial role in infesting humans and domestic animals. Therefore it is of paramount importance that parasitic diseases in wild animals are monitored on annual basis that allows to determin their evolution, emergence of new parasitic agents and elaborating new combating measures for such.

81-84

Authors: Sergiu DOBROJAN, Irina STRATULAT, Alina TROFIM, Galina DOBROJAN

This article presents the amino acid content of the blue-green alga Nostoc gelatinosum (Schousb) Elenk. collected from the Drew nutritive medium. From the essential amino group in Nostoc gelatinosum (Schousb) Elenk. biomass, major amounts are contained leucine (2,142 ± 0,06 mg/100 mg), threonine (1,188 ± 0,02 mg/100 mg) and valine (1,085 ± 0,03 mg/100 mg). From nonessential amino acids predominates aspartic acid (4,523 ± 0,11 mg/100 mg) and glutamic acid (2,774 ± 0.07 mg/100 mg). The alga Nostoc gelatinosum (Schousb) Elenk. has a high content of amino acids and can serve as a source for vast areas of application.

88-94

Authors: Alina TROFIM, Victor ŞALARU

In this article are presented structural features of edaphical algal flora of greenhouses from village Chistelnita. Taxonomic structure consists of 53 species and varieties of algae belonging to 31 genera, 22 families, 16 orders and 7 classes, of which the highest diversity have Hormogoniophyceae and Xanthophyceae classes, with 16 and 14 species. Ecological characteristics of algal flora demonstrates the predominance of P ecobiomorphic, which are devoid of heterocyst and spread through the particles of ground or on the surface of it. In soils algal flora were discovered four species belonging to CF ecobiomorphic and they are nitrogen fixing: Anabaena sp., Cylindrospermum licheniforme (Bory.) Kutz., Nostoc linckia (Roth.) Born. et Flah. and Nostoc sp., which according to data from the literature, is promising strains for promoting organic farming.

103-109

Authors: Regina FASOLA

Within the present study was assessed the content of heavy metals in the soils of the Cereşnovăţ river basin, and particularly within the forest ecosystem “Racovăţii de Sud”. The content of heavy metals in the soils of the Cereşnovăţ river basin was determined according to the methods recommended by ICP Forest program after soil types, on fixed layers of 10 cm. Based on the outcomes was observed that the accumulation of heavy metals is dependent and influenced by various factors: human factor, the distance from the pollution source, the terrain, the physical properties of migration of heavy metals and soil type. It was found that low - medium content of heavy metals in the soils of Cereşnovăţ river basin presents favorable ecological conditions to biotic components of the forest ecosystem “Racovăţii de Sud”. Results allow us to conclude that the health of biodiversity and functioning capacity of the ecosystem are not threatened by edaphic factor.

114-118

Authors: Maria SANDU, Galina DRAGALINA

The quantity of water on the planet is estimated at 1,338 million km3 of which only 2,57% is freshwater. But from liquid freshwater, only 3% is expected to be taken for human consumption, which, in fact, is in growing. For example, global water consumption has tripled from 1950 to 1990 and in the period of 1990-1995 years it increased six times. Problems related to water quantity and quality are related to its uneven distribution around the globe, by reducing the amount of potable water, increasing pollution with organic substances, nitrogen compounds, heavy metals, etc. Water quality can be improved only by empowering all citizens in the Republic of Moldova, by motivating them to get involved in all activities to protect waters in the territory. This study comes to argue the importance of examining water quality, listing the causes of pollution, involvement in all activities to prevent and reduce pollution.

125-129

Authors: Valentin CODREANU

As a result of quantitative anatomic study of leaf blade of 5 species of genus Clematis L., is established that anomocytic morphological type of stomatal apparatus (complex) is characteristic for the abaxial and adaxial epidermis. Stomatal density of leaf epidermis of clematises is specific, but varies in different years. The density of leaf stomata characterizes every species and varies, in drought 2007 year, from 119,05/mm2 at species Clematis vitalba to 182,05 stomata/mm2, at species C.tangutica. The greater average thickness of leaf blade and present of stomata in adaxial epidermis of leaf blade evidence more drought resistant species of clematises.

142-155

Authors: Mihail SECU

There were highlighted manganese(III) coordination compounds with Salen type ligands, which exhibit single molecule magnet (SMM) and single chain magnet (SCM) behaviour. It was narrated the principle of assembly bis(salicylidene)isothio¬semicarbazide similar with Salen type ligands, for identify and describe the new methods of rational synthesis of single molecule magnets and single chain magnets, which have as building blocks these manganese(III) complexes.

168-175

Authors: Ion ARSENE

Dinuclear manganese based enzymes engage in processes as diverse as hydrogen peroxide disproportionation and α-amino acidhydrolysis. N,N’-bis(2-pyridylmethyl)-ethylamine dimanganese complexes manifest a high catalytic activity in the hydrogen peroxide decomposition in two stages. In this work the results of DFT calculations on two complexes, [(L)2(Mn(III))2(CH3CO2)2(OH)2]2+ and [(L)2(Mn(IV))2(CH3CO2)2(O)2]2+, involved in steps (I) and (II), different values of the total spin are reported. According to these calculations it results that both systems with high-spin electronic terms have lowest energy. The general energy gain calculated in this processes is -46.56 kcal/mol and this fact confirms the feasibility of this reaction.