Studia Universitatis Moldaviae. Stiinte reale si ale naturii

03-11

Authors: Ştefan MANIC

Data on ecological diversity of lignicolous macromycetes inventoried in the Republic of Moldova are mentioned in the paper. It has been determined that trophic links are closely related to the physical condition of the wood, which shows the specificity of the relationship mushroom-substrate. The 272 species of lignicolous macromycetes inventoried in various stages of wood decay were differentiated into three phases of wood decay. Wood macromycetes, namely Aphyllophorales, mainly participate in the first and second phase. In the third phase, wood decay is caused almost entirely by Agaricales.

17-21

Authors: Аркадий НИКОЛАЕВ, Светлана НИКОЛАЕВА, Ирина МАКСИМОВА

A method for colony account in Petri dishes by analyzing digital images of dishes and marking of recorded colonies by means of computer graphics editor Microsoft Paint and a registration of recorded colonies number in the new open Microsoft Office Excel window is proposed. Obtaining digital images allows documentation and archivation the data and to carry out account at any desired time. Possessing all device advantages for counting colonies in Petri dishes, the method allows to avoid any other special devices for this purpose and to account any kinds of microorganism colonies.

28-33

Authors: Maria TIMOŞCO, Natalia FLOREA, Radu COJOCARU, Aliona VELCIU , Victoria BOGDAN

Acceleration of the multiplication process of the bifidobacteria and lactobacilli reveals the significant role for human health. In results of investigation of the 3 strains and its 3 associations multiplications (initially respectively of I-VI groups, at 106,62 and 49,64; at 107,57 and 61,70; at 110,29 and 55,40; at 124,20 and 61,97; at 97,32 and 72,20; at 96,47 and 69,46%), was shown considerable adhesion to the intestinal mucous membrane (in the same groups respectively at 134,05 and 33,84; at 138,36 and 79,61; at 151,29 and 72,69; at 156,46 and 71,92; at 167,24 and 142,24; at 184,05 and 137,30%, comparing with a control group). Bifidobacteria and lactobacilli display the positive impact for human health conditions and diminish the multiplication rate of the facultative bacteria (conditional pathogens) of the digestive tract (Escherichia, Proteus and the family of Streptococcaceae).

37-41

Authors: Ludmila BEJENARU

In the current work we propose efficient methods of manoproteins extraction from yeast biomass. The method of application of cellular biomass autolysis for 24 hours combined with alcaline treating increases the manoproteins extraction with 23.3%, compared to the control sample. Physical and chemical attributes of the isolated manoproteins from yeast cell walls are described.

51-58

Authors: Aurelia CRIVOI, Saleh YAACOUBI

The purpose of this study is to systemize a neuro-physiological modification scopes that is related to regulate the obesity and food intake among diabetics type2. the plant cinnamon was examined in order to understand its influence upon beta pancreatic cells to secret insulin as well as to comprehend its effects upon leptin (which is secreted from adipose tissue) and on neuropeptide Y(a potent food intake) which participate in obesity.

63-66

Authors: Petru PAVALIUC

The article analyzes the data according to which mental health represents a dynamic, multi-level process or pheno¬me¬non, each level of which is characterized through various psychic and psychosomatic manifestations, regulation and adaptation mechanisms, and individual relationships with the surrounding world. However, mental health can be defined as an integral sanogenous feature of the subject which is in direct relationship with the external environment. Mental health manages the evolution of the mental processes and is determined by different social and individual criterion.

74-79

Authors: Iulian PARA

The use of all the beekeeping products for maintaining and protecting directed improvement of their health and their effects sanogenic tests on a large number of consumers and patients, allow to arrive at objective conclusions about the usefulness of broadening their mass production and use by a growing number large population.

87-93

Authors: Aurelia CRIVOI, Iurie BACALOV, Elena CHIRIŢA, Ana MĂRJINEANU

Iodine is an essential nutrient for the synthesis of thyroid hormones, which are critical for brain development. Much of our health problems are due to hormonal disorders. With age, these aspects are emphasized. There were obtained remarkable results by removing hormonal imbalances using individualized treatment plants and other natural products. These treatments, although sometimes it takes longer than medical treatments, are much cheaper and have no side effects.

99-103

Authors: Лидия КОЖОКАРЬ, Аурелия КРИВОЙ

Symptoms of varying degrees of thyroid failure were shown to all patients with hypothyroidism confirming the high concentration of TSH. High, medium and mild constant anxiety was identified to patients with primary and post-operative hypothyroidism; continuous medium and light anxiety to patients with congenital hypothyroidism. The clinical manifestations of anxiety having vegetative and psychic character as the symptoms associated with changes in the functional state of the nervous system are the most permanent hypothyroidism.

109-1116

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

Development and application of enzyme engineering technologies using enzymes for the hydrolysis of Phycocyanin and production of bioactive peptides opens up new prospects for their use as anticancer, antimicrobial, antioxidant, hypotensive agents. Diversification of the range of produced peptides can be performed by the enzymolysis and using of the proteolytic enzymes with diverse specificity for this purpose. The paper presents the UV spectra of summary tryptic phycocyanin hydrolysates and some methods of separation and analyzing of peptide fractions.

121-124

Authors: Елена ПЕЛЯХ, Виктор МЕЛНИК, Василий ЧОБАНУ, Ион УНГУРЯНУ

In course of our investigation of genus Mentha we have analyzed the essential oils of some widely growing population of Mentha piperita L. collected in different regions of Moldova. The essential oils showed the same chemical composition but oil compounds in various proportions.

132-137

Authors: Ho Anh TUAN, Ngo Xuan QUANG, Laurentia UNGUREANU, Dumitru BULAT

Analysis and identification of 57 specimens of genus Macropodus Lacépède collected from Gianh River in Quang Binh province in north center region Vietnam. We have classified three species: Macropodus erythropterus (Frey. & Her., 2002), Macropodus opercularis (Linneaeus, 1758), Macropodus spechti (Schreitmüller, 1936) was first discovered in the study area and north center region Vietnam.

148-159

Authors: Dumitru ERHAN, Elena GHERASIM

The paper presents data on trematodes infestation in amphibians from family Ranidae (Amphibia, Anura) in natural and anthropized ecosystems of Central Codri forest from the Republic of Moldova. The helminthological researches of amphibians were accomplished for the first time in the Republic of Moldova. As result the infestation of Ranidae family species (Rana ridibunda, R. lessonae, R. esculenta) with trematodes from families Gorgoderidae (Gorgodera varsoviensis Sinitzin, 1905), Diplodiscidae (Diplodiscus subclavatus Pallas, 1760), Plagiorchiidae (Opisthioglyphe ranae Frohlich, 1791, Haematoloechus variegatus Rudolphi, 1819), Cephalogonimidae (Cephalogonimus retusus Dujardin, 1845) and Lecithodendriidae (Pleurogenes claviger Rudolphi, 1819, Pleurogenoides medians,Olsson, 1876, Prosotocus confusus Looss, 1894, Candidotrema loossi, Africa, 1930) was established. In the paper there are presented the resuts regarding the infestation of complex Pelophylax esculenta by the trematode species from families Plagiorchiidae and Cephalogonimidae. For each species there were established: taxonomic status, including synonyms, the hosts, the location in organs, the geographic spreading, etiology and biologic cycle. There are also mentioned the amount of collected material, the morphologic description of the species, original figures and pictures, the level of infestation depending on age, sex and ecosystem.

164-172

Authors: Vera MATVEEVICI, Maria GONŢA, Larisa MOCANU, Viorica IAMBERTEV

Laboratory research has been conducted on model systems containing textile dyes as basic components, and as auxiliary compounds were used surfactants and polyalcohols. The concentration of the organic components of the studied systems is reduced as a result of using advanced physic-chemical methods. At first stage was performed electrofloatation process that takes place under the action of electrolytic gases, which was followed by oxidation with Fenton's reagent or titanium dioxide with UV irradiation (Λ=365 nm). Samples that have not been treatment to acceptable standards have been subjected to the subsequent adsorption process of compounds remaining onactive carbon. As a result of scientific research it was found that the degree of water purification by organic compounds depends on the time of electrofloatation and surfactant concentration. The mixture of active dyes and cationic surfactants in model solutions may be treated by a combination of electro¬floatation and adsorption methods on active carbon, and the solutions containing a mixture of direct and active dyes, anionic surfactants can be purified by combining electrofloatation, catalytic oxidation with hydrogen peroxide methods, and adsorption on active carbon. In the presence of polyalcohols (ethylene glycol) the effect of removing the mixture of dyes, surfactants and ethylene glycol decreases,therefore, solutions are not purified to the sanitary norms, even in case of combining electrofloatation, catalytic oxidation and adsorption on active carbon methods.

178-185

Authors: Vasile RUSU, Alexei MAFTULEAC, Oleg PETUHOV, Veaceslav KULCIŢKI, Marina GRINCO, Larisa POSTOLACHI, Maria RUSU

Larguta bentonite prior treatment with dilute acid (pH 2) further being pillared with aluminum oligomeric species, result in modification of the surface properties of the adsorbents - acidity, sorption-structural characteristics and thermal stability. The kinetics of the conversion of oleic acid to esterification with ethylic alcohol is influenced by the nature of the acid catalysts used. Pillared adsorbents obtained on the basis of bentonite Larguta (RM) possess real prospects for obtaining bio-fuel from vegetable oils.

193-209

Authors: Ion BULHAC, Anastasia ŞTEFÎRŢĂ, Eduard COROPCEANU

There were highlighted iron, cobalt, manganese μ3-oxo homo- and heteronuclear coordination compounds, dioximates and compositions consisting of macro-, microelements and vitamins with stimulation properties of crop plants growth and development, rising the germination energy of treated seeds, antioxidant properties, increasing plant resistance to drought and suboptimal temperatures, incrementing plant productivity and improvement of production quality. There were established the terms of use, including optimal concentration of coordination compounds in the cultivation processes of agricultural plants: corn, sugar beets, beetroot, cucumbers, tomatoes, beans, soy and other.

216-223

Authors: Oleg PALAMARCIUC, Tatiana PALAMARCIUC, Ion CORJA

The condensation of 5-bromosalicylaldehyde with Girard’s T reagent yields a new hydrazone [H2(5BrSalGT)]Cl. This tridentate ligand is soluble in water and react with iron ions with the formation of coordination compound [FeLCl2]. In water solutions [FeLCl2] interact with azide ion N3- allowing the formation of [FeL(N3)2]2 (1) and [Fe(L)2]N3.6H2O (2) compounds. The crystallographic studies of 1 and 2 show that in the coordination process the ligand is deprotonated and coordinate to the metal as monoanion. The cryomagnetic studies of 1 and 2 show a paramagnetic behaviour.

230-235

Authors: Victor COVALIOV, Irina SENICOVSCAIA , Vladimir NENNO, Valentin BOBEICA, Olga COVALIOVA

The influence of amaranths‘ seeds as the source of squalene on the dehydrogenase activity and efficiency of methane production were investigated in methanogenic bench-scale (5000 ml) bioreactors used to treat the mixture of distillery wastes and farmyard manure. The adding of amaranth seeds to the methanogenic bioreactor has an inhibitory effect on the dehydrogenase activity and stimulates the process of methanogenesis. Dehydrogenase activity decreased with the increase of doses of squalene and its trend had a close connection with doses (R2=0.77-0.78). The methane content in the total amount of gases is 65.3-71.3% in a bioreactor with the additive of amaranth seeds in a dose of 50 mg l-1, which is 22.1% higher than in the the control bioreactor without additives. The increase in squalene concentration higher than 0.0005% is not rational because its stimulating effect on the methanogenic process decreases. Anaerobic digestion of alcohol distillery industry wastes with manure is a complex nonlinear time-varying microbiological process. Dehydrogenase activity trends in the experiment are described by the power function for 5 hours observations and by the logarithmic function for 120 hours of observations. Trends of CH4 are described by the polynomial function in all periods of testing. Correlation coefficients are 0.37 and 0.70 for CH4 after 5 and 120 hours of the anaerobic digestion. Dehydrogenase activity is in the close negative connection with the amount of gases, including methane. Correlation analysis between dehydrogenase activity and the release of gases has revealed the moderate and strongly negative link during 24 hours after the start of the experiment.

4

Authors: Sergiu DOBROJAN, Irina STRATULAT, Galina DOBROJAN

In this article are present the result on the state of water quality of the Răut river in sector of village Piatra, Orhei district during the spring of 2014. As a result, it was found that water of the river Răut has a low content of nitrates, nitrites and chlorine, that does not exceed the maximum admissible concentrations for drinking water, and concentration of mineral salts, ammonium ions and water hardness is high, exceeding the 1,04 to 20 times the maximum admissible concentrations for drinking water. The water of the river Răut on the monitored sector lies within the limits of clean to polluted. It was demonstrated that water quality of the river. Răut is determined by the influence of anthropogenic factor.

5

Authors: Iurie BACALOV, Irina BACALOV, Aurelia CRIVOI

Currently, major attention is given to preventive measures and the development of methods that ensure regression and remission of diabetes. Herbs have an important role in solving this problem. Administration of extract Arctium IV contribute to the normalization of metabolism, which is expressed by reducing the primary symptoms of this disease. Also, the results of investigations showed no adverse effects, therefore this complex has a polyglandular action and can be administered in disorders of carbohydrate metabolism.

5

Authors: Lidia COJOCARI

Rhythmicity motor activity reflects the unity of the body with the environment. Motor activity in preschool changes depending on the seasons, in accordance with biological rhythms: decreasing in winter and increasing in summer by 24,15% compared to the mean, which is 5,85% lower than normal values for this age and a hypo-dynamic is estimated.

5

Authors: Liliana ZOSIM, Cezara BIVOL, Daniela ELENCIUC, Ludmila BATÎR, Svetlana DJUR, Olga OLAN

The dunaliella productivity, content of glycerol in the dunaliella biomass at cultivation in the presence of some Ge(IV) compounds at the different light intensity was determined. The light intensity is a decisive factor in the accumulation of biomass and glycerol synthesis by D. salina grown on organic-mineral medium in the presence of Ge(IV) compounds. From all Ge(IV) compounds, GeO2 in the concentration of 20mg/L ensured the increase of productivity and glycerol with 11.2% and 33.2%, respectively, compared to the control samples.

5

Authors: Ivan KAPITALCHUK, Nadezhda GOLUBKINA, Sergey SHESHNITSAN, Marina KAPITALCHUK, Tatiana GRISHINA

În articol sunt prezentate rezultatele cercetării capacităţii macromicetelor de a acumula seleniu şi alte elemente chimice. S-a constatat că ciupercile din valea Nistrului acumulează în corpul lor 0,147-24,92 mg Se/kg de masă uscată. Concentraţia de seleniu în ciuperci depinde de condiţiile ecologice şi geochimice de creştere, fiind mai ridicată în eco¬sistemele acumulative din depresiuni. Conţinutului de macro- şi microelemente în ciupercile sălbatice şi în cele cultivate (Agaricus bisporus) diferă în mod semnificativ.

5

Authors: Vasilii GRAUR, Elena ZARICIUC*, Victor TSAPKOV, Nina BARBA, Aurelian GULEA

The paper presents the synthesis of the ligand 5-nitrofuran-2-carbaldehyde N(4)-allyl-3-thiosemicarba¬zone (HL) and eight coordination compounds of copper(II) and nickel(II) with this ligand. The structure of thiosemicarbazone HL was studied using 1H and 13С NMR spectroscopy. For the synthesized compounds their antimicrobial and antifungal activity was studied on a series of standard strains. For HL and Cu(HL)2(NO3)2 the antitumor activity towards human leukemia HL-60 cells was estimated. It was established that coordination compounds manifest better activity than free ligand.

6

Authors: Petru BUNDUC, Vitalie SOCHIRCĂ, Tatiana BUNDUC

This article conducts research on the role of religious particularities of population in migration networks shaping in Botoşani County, Romania. Religion still plays a primary role in society, formed some pretty strong and active social networks. Compared to other counties, in Botoşani County the population of Orthodox Christian confession always held more than 90%. Neo-Protestants and Catholics play an important role in international migration circuit in the county, and can be called "pioneers of emigration", especially Pentecostals.

7

Authors: Aurelia CRIVOI, Elena CHIRIŢA, Iurie BACALOV, Ana MĂRJINEANU, Tatiana BODRUG, Maria PRODAN, Ilona POZDNEACOVA

An important factor for thyroid hormone biosynthesis is increased intake of thiocyanate ion (SCN-), which contains food (cabbage, radish, walnuts, sunflower seeds, dill). The action of extracts of the products mentioned has been demonstrated in experiments on animals. Any change of status may induce endocrine changes to the blood. Herbal extract positive in¬fluence on functional status in disturbances improving hematological their initial stages disorders. After some research occurring in Sudan, where 85% of children suffer from goiter, has been reported low levels of thyrotrophic, low concen¬tration of iodine in urine due to a high average concentrations of thiocyanate in urine. The authors concluded that the high incidence of hipotireozei attested in older children 2 years is due to the combined action of iodine deficiency and thiocyanate.

7

Authors: Irina BACALOV

Experiments conducted on rats with alloxan diabetes determined highlight changes in the figurative elements, which is the consequence of metabolic disorders in the body as a result of developments occurring diabetes. The investigation results show that the researched extract of herbs (FASSC-V) possesses the biostimulative functional activity on hematological indices, which presents important role in stopping of complications in experimental diabetes.

7

Authors: Mihail SECU, Oleg PALAMARCIUC, Pierre DECHAMBENOIT, Rodolphe CLÉRAC

New coordination compounds [{MnIII(L)•(CH3OH)2}2{FeII(CN)5(NO)}]•2CH3OH was synthesized and structurally characterized by X-ray single-crystal diffraction. The structural analyse shows that complex consist of the discrete linear trinuclear [{MnIII(L)•(CH3OH)2}2{FeII(CN)5(NO)}] unit, where the nitroprusside Fe(II) anion coordinates to the axial sites of the two [MnIII(L)]+ (H2L = N1,N4-bis(salicylidene)-S-methylisothiosemicarbazide) entities through its two trans-cyanido nitrogen atoms. Elemental analysis and IR confirms the purity of the final product.

14

Authors: Alexandra DESEATNIC-CILOCI, Eduard COROPCEANU*, Steliana CLAPCO, Andrei RIJA, Jana TIURINA, Cezara BIVOL, Olga BOLOGA, Ion BULHAC

The influence of coordination compounds of cobalt, copper and zinc with oxime ligands on the biosynthesis of exo¬cellular hydrolases of fungal strains Aspergillus niger CNMN FD 10 – producer of cellulases and xylanases, Trichoderma koningii Oudemans CNMN FD 15 and Fusarium gibbosum CNMN 12 – producers of proteases was studied. The differential effect of tested compounds on the biosynthesis of hydrolases, depending on the origin of micromycetes and the synthesized enzymatic systems was established.

3

Authors: Марина МАРИНЕСКУ, Николай БУЖОРЯНУ, Людмила КОЛЕСНИКОВА, Валентина СВЕТЛИЧЕНКО

The article describes the changes of surface structures 10 winter varieties of apple fruit during the long-term storage, depending on the concentration oxygen and carbon dioxide. Study of the structural changes in the tissues of winter varieties of apple fruits stored for 180 days under the CSG, revealed the following trends: the ability to long-term storage in a lack of oxygen determined by the rates of biodegradation components of the cuticle and epidermis, intensity of intercellular space formation and consumption of cellular nutrient substances (poly- and monosaccharides). Our studies have also enabled to determine the optimum ratio O2/CO2 for each variety during the long-term storage.

3

Authors: Eugeniu DUDNIC, Natalia DUDNIC

The interdisciplinary collaboration has established psychoneuroimmunology, or neuroimmunomodulation, as a new field of investigation with the goal of rigorous scientific research into the elusive mind-body connection. This has resulted in the rapid accumulation of information which falls across the boundary lines of psychiatry, immunology, neurosciences and endocrinology. This article examines the effects of stress on the endocrine and central nervous systems and the interactions between these systems and the immune response after exposure to stress signals.

4

Authors: Viorica TRIFĂUŢAN, Alexandru CIUBOTARU

This study aimed to determine the performance of different rizogenetic substrates, physical and chemical characte¬ristics, and nutrients content, degree of acidity and alkalinity, compost, peat, sawdust, perlite. For normal development, abundant flowering and successful wintering miniroses suitable substrate was required. The mixture was succeeded sandy soil, foliage, peat and manure.

5

Authors: Lidia COJOCARI, Aurelia CRIVOI

Veridical differences in psychosomatic status were determined for patients with postmenopausal syndrome and women with normal physiological evolution of menopause. The menopausal syndrome was estimated the SNV functional liability, especially sympathetic component.

5

Authors: Petru PAVALIUC, Alexandr CORLĂTEANU

The present article describes the peculiarities as related to manifestation, integration and implementation of various reactions of the organism on its different levels of locomotor activity and situational conditions under the influence of stimuli of diverse influence’ limens (under limen, limen and supralimen) depending on the assigned motor mission, stimuli parameters (modality, effect intensity and frequency, level of including of the perceptive capability, of the afferent information retained in memory, and functional status of the neuronal reticulum of the sub cortical nucleus). The phenomenon is characterized by its integrative character of the perceptive processes that assure the psychological as well as psycho-somatic functions.

5

Authors: Agafia USATÎI, Elena MOLODOI, Nadejda EFREMOVA, Ludmila FULGA

In this paper are presented modifications taken part in mitotic cycles of Saccharomyces cerevisiae CNMN-Y-18 as the result of application of millimeter waves with extremely high frequency. It was determined that the dynamics of the process of growth of the population depends on the duration of irradiation. Maximum effect of the increase of viability was established in the interval 12-48 hours at the irradiation at 20 minutes with millimeter waves with the frequency f=53,33 GHz. The double irradiation of the culture at different stages of development, modify insignificantly the amount of cells in comparison with the unirradiated control.

5

Authors: Victor COVALIOV, Dumitru UNGUREANU, Olga COVALIOVA, Ion IONEŢ

This study highlights the recent advances in the pretreatment of lignocellulosic wastes. Mechanical, physical and biological pretreatment systems are brought into perspective. Physicochemical and biological pretreatment systems seem to be the most favored options for lignocellulosic biomass before solid-state anaerobic digestion. Engineered microbes seem to tackle the problem of bioconversion of substrates that are otherwise non convertible by conventional wild strains. Future trends are being directed to nanobiotechnology and genetic engineering for improved processes and products. The paper presents state of the art review of the dual advantage of handling lignocellulosic biomass for cleaner environment and production of renewable bio-products.

6

Authors: Aurelia CRIVOI, Elena CHIRIŢA, Iurii BACALOV, Lidia COJOCARI, Irina BACALOV, Ana MĂRJINEANU, Ahmed Abu ZAITON

Metabolic disturbance on the background string diabetes induces activation of compensatory mechanisms in the adrenal gland. Adrenal gland plays a large role in both the regulation of carbohydrate and lipid metabolism, and the application of compensatory mechanisms in response to the actions of endogenous and exogenous stressors.

6

Authors: Alexandru POPOV

The article reports on the disease relapses epileptic duration of remission and relapse risk in patients with epilepsy. It was a study on a group of 104 patients with mild mental disorders in epilepsy. The experimental group consisting of 76 patients with relapsing remitting; control group, 28 patients without remission. A demonstrated the importance of two factors in determining the risk of relapse to remission in patients with epilepsy. These factors are: 1) form of epilepsy, 2) the type of epilepsy development. Relapses, as our study found, retained throughout the development of epilepsy.

6

Authors: Ana MUTU

In this study, the genetic diversity within different populations of Origanum vulgare – an important aromatic plant, widely used in food and pharmaceutical industry, has been carried out using random amplified polymorphic DNA (RAPD) markers. The studied genotypes are characterized by a high genetic variability, tested primers generating a total of 153 RAPD fragments of which 68% were polymorphic. To conclude, RAPD analysis can be used to gain rapid infor¬mation about genetic similarities or dissimilarities within different genotypes.

6

Authors: Tatiana DUDNICENCO

In the results of these studies have been elaborated the ecotouristic itinerary: „Carpov Iar” ravine, „Rudîi Iar” ravine, „La 33 de vaduri” landscape reserve and „Călărăşeuca” landscape reserve. It have been described the main object for visitation by tourists and have been emphasized its main ecological problems, solving which would boost the development of ecotourism at international level. Ocnita district possesses rich and representative human and natural resources which facilitating the development of eco-tourism in the North region of the Moldova Republic.

7

Authors: Eduard COROPCEANU

The synthesis of a serie of cobalt(III) dioximates (methylglyoxime – MH2, dimethylglyoxime – DH2, diphenil¬glyoxime – DfH2, 1,2-ciclohexanedionedioxime – NioxH2) has been performed, which have some additional organic ligands (thiocarbamide, pyridine, aniline, nicotinamide, sulfanilamide, ortho-phenanthroline) coordinated to the central atom. It was proved that the specific spatial arrangement of the assembled molecules depends on the nature of the axial ligands. The charge of the cationic complex is compensated by the tetrafluoroborate anion, which forms a system of hydrogen bonds with the water molecules. Several representatives of this series are good biostimulators of enzymogenes processes of some fungal strains.

8

Authors: Sorin PERJU, Ioana STANESCU

The supply of quality potable water to the customers’ branch pipe of the distribution network represents a major responsibility for the water supply system operators. There are circumstances when the quality of the water produced in the water treatment plant is palatable, but the same water distributed to the consumers might be altered (from quality point of view) due to its transport through the distribution network. For that purpose, the present article describes the analysis application to the way the residual chlorine concentration evolution is performed in a regional water distribution network. The numerical model of the distribution network was carried out through the program EPANET 2.0, and the simulation of the network’s performance was performed for a 72 hours period, with the aim at control the residual chlorine concentration in terms of flows passed through.

9

Authors: Vasile RUSU, Raisa NASTAS, Nina ŢÎMBALIUC, Alexandru GONŢA, Alexei MAFTULEAC

The luminol chemiluminescence effect presents an effective procedure for comparative assessment of the catalytic activity of the catalysts. It was found that the most pronounced catalytic effect, having a chemiluminescence intensity about 18 times higher compared to the control sample, possess Al-pillared montmorillonite, obtained at initial molar ratio OH-/Al3+ 2:1, afterwards calcined at 450oC and transformed into H-form. This sample also possess better efficiency (94%) of oxidation of the methyl-orange in the presence of H2O2 and more enhanced Brönsted acidity.

12

Authors: BLUE-GREEN ALGAE (CYANOPHYTA) – THE SOURCE OF THE SECONDARY BIOACTIVE METABOLITES

The review of research results in recent decades connected to cyanobacteria as the sources of bioactive secondary me¬tabolites. The main classes of secondary metabolites produced by cyanobacteria with toxicity to humans and animals are presented. Some cyanobacteria strains producing microcystins, nodularins, saxitoxins, cylindrospermopsins, lyng¬by¬a¬toxins and lipopolysaccharides are evaluated and some factors that influence on the secondary metabolites production and prospective of its application in pharmaceutical or agriculture are described.