Studia Universitatis Moldaviae. Stiinte reale si ale naturii

3-13

Authors: Dang Thi Minh OANH, Nguyen Thi LAM, Che Thi Hoai THU, Ho Anh TUAN

Analysis and identification of 90 specimens of genus Acentrogobius bleeker, 1874 collected from estuary and coastal of Nghe An province, Vietnam. We have classified five species: Acentrogobius caninus (Valenciennes, 1837); Acentrogobius chlorostigmatoides (Bleeker, 1849); Acentrogobius moloanus (Herre, 1927); Acentrogobius cf. viridipunctatus (Valenciennes, 1837) and Acentrogobius cf. viridipunctatus (Valenciennes, 1837). The species Acentrogobius moloanus (Herre, 1927) and Acentrogobius cf. viridipunctatus (Valenciennes, 1837) was first discovered in the study area and the north center region of Vietnam.

23-29

Authors: Dinh Thi Thu HIEN, Nguyen Thi THOA, Nguyen Thi Thao NGUYEN, Ho Anh TUAN, Ong Vinh AN

This research identified 45 specimens of genus Oxyurichthys Bleeker, 1874 collected from estuary and coastal of Nghe An province in north center region Vietnam. We have classified four species: Oxyurichthys microlepis (Bleeker, 1849); Oxyurichthys ophthalmonema (Bleeker, 1856); Oxyurichthys tentacularis (Valenciennes, 1837); Oxyurichthys visayanus Herre, 1927. The species Oxyurichthys ophthalmonema (Bleeker, 1856) and Oxyurichthys visayanus Herre, 1927 was first discovered in the study area and north center region of Vietnam.

34-41

Authors: Valentina BULIMAGA, Liliana ZOSIM, Alina TROFIM, Veaceslav REVA, Maria-Bianca BULIMAGA

In the present work, the authors studied the effect of Cu (II) and Zn (II) acetates with and without addition of glucose and the influence of two illumination regimes on the productivity and production of intracellular polysaccharides in cyanobacterium Spirulina platensis. The composition of the polysaccharide fractions obtained by chromatographic separation on a Toyo-Pearl column was analyzed and their proteoglycanic nature was determined. A scheme for the extraction and purification procedure of the polysaccharide complex from biomass has been proposed.

48-57

Authors: Aurelia CRIVOI, Iurie BACALOV, Elena CHIRIŢA, Ana ILIEŞ, Ilona POZDNEACOVA, Adriana DRUȚA, Iulian PARA, Victor CIOCÎRLAN

One of the most prevalent affections in the modern world is represented by the diabetes mellitus type II. In this case, the pancreas has no more ability to produce sufficient insulin or the body cells lose the insulin reaction, which leads to high glucose levels. A set of natural products have been investigated by chemical and biological point of view in order to stimulate some organism functions. A particular task holds propolis, with immunomodulatory, anti-inflammatory and antioxidant qualities, that is appreciated as one of the most efficient natural drugs.

64-70

Authors: Valentin CODREANU

The article presents the root anatomy of 7 grapevine distant hybrids (Vitis vinifera L. x Muscadinia rotundifolia Michx.). Rhizoderm, primary cortex and central cylinder (stele) are described in the primary anatomic root structure. The first periderm anatomy is presented in the secondary anatomic root structure. This is developed from subepidermal cell layer, as in species Muscadinia rotundifolia Michx., which is resistant to root phylloxera.

75-87

Authors: Gheorghe JIGĂU, Elena TOFAN, Victor ȘALARU, Sergiu DOBROJAN, Nina PLĂCINTA, Cristian JIGĂU, Eugeniu CIOBANU

This paper presents the results of soil physical indicators indicating how carbon sequestration in the soil is administered when nitrogenous cyanophyte algae biomass is used to grow corn and sunflower. Thus, it was found that all nitrogen fixing cyanophyte algae species contribute to the accumulation of organic carbon in the soil. At the same time, it was observed that the aggregation-structuring activity is interspersed with the activity of saturation of the root system of the cultivated plants (corn, sunflower). This process is more intensive in the case of corn crops. The intensity of the organic carbon sequestration process in the soil with the participation of the experimental algae can be reproduced with the following pedofunctional rows in the sense of decreasing: Corn crop: Nostoc gelatinosum > Calothrix gracilis > Combined lot > Cylindrospermum licheniforme > Nostoc linckia. Sunflower culture: Nostoc gelatinosum > Combined lot > Cylindrospermum licheniforme > Calothrix gracilis > Nostoc linckia.

95-99

Authors: Alina BEȘLIU, Nadejda EFREMOVA, Agafia USATÎI, Ludmila BATÎR

The paper provides new information on the influence of ZnO nanoparticles of <50 nm and <100 nm on pigmented yeast Rhodotorula gracilis CNMN-Y-03. It has been established that the viability, carotenoid and carbohydrate content of the strain has changed according to the size and used concentration. It has been demonstrated that the viability of yeast cells depends on the contact time for both types of nanoparticles. The results have highlighted that concentrations of 1-20 mg/l increased the amount of carbohydrates and maintained the content of carotenoid pigments at the level of the control sample, whereas the concentrations of 30-70 mg/l become toxic for the studied strain.

103-111

Authors: Agafia USATÎI, Natalia CHISELIȚA, Alina BEȘLIU, Nadejda EFREMOVA, Ludmila BEJENARU, Ludmila BATÎR, Constantin DADU, Ana TANASE

The paper reveals new insights about the degree of action of nanoparticles with different physico-chemical characteristics: ZnO (10 nm, 30 nm, <50 nm, <100 nm), TiO2 (30 nm, 40 nm), Fe3O4 (10 nm, 30 nm, 50 nm-100 nm) and ZnO/MgO (10/11 nm) on Saccharomyces cerevisiae CNMN-Y-18, Saccharomyces cerevisiae CNMN-Y-20 and Rhodotorula gracilis CNMN-Y-30 yeast strains with performing biotechnological qualities. Key factors in triggering cell response are nanostructure, dimensions and concentrations of metal nanoparticles. Important cellular responses are viability, content of the proteins and carbohydrates, including β-glucans and mannoproteins, content of the carotenoid pigments, including β-carotene, torulene and torularhodin, antioxidant activity of SOD and catalase as elements of cellular oxidative stress. Analyzing the effects of metallic nano-oxides on yeast strains, we mention their importance in regulation of the cultivation and biosynthesis of cell bioactive substances with biotechnological interest. The results of the modeling of biosynthetic processes with the application of nanoparticles present advantage in the development of innovative applications, especially in bionanotechnology, biomedicine, food industry, environmental protection, and other fields.

119-124

Authors: Анатолий МАНТОПТИН, Влада ФУРДУЙ, Нина КОВАРСКИ, Валентина СТРОКОВА, Анастасия ТЕЛЕВКО

The physicochemical composition, biological properties of bee polen and bee bread, as well as the reasoning for their practical use are considered in the article. These beeproducts are not only highly concentrated preparations balanced on all substances necessary for human life, but can also be used to form and maintain the sanogenic status of the organism in different age and functional periods of a person.

128-140

Authors: Viorica GLADCHI

The waters of the Raut river in the period of 2015-2018 were characterized as high mineralized and hard waters that are impossible to be used as irrigation waters. The waters of the river are excessively polluted with organic matter that is hard to degrade and diverse mineral forms of biogen elements. In most cases, the waters of the river are attributed to IV-V class of quality, that is considered to be badly polluted waters. The excessive quantity of mineral nitrogen in Raut’s water create a real precedent for fast anthropogenic eutrophication of the river. The data obtained states that the quality of the water in Raut is of a great influence on the quality of the water in Dniester river. The waters of Raut are polluting Dniester and transforming its waters from class II (good quality waters) into class III (moderate polluted waters). It was established the tendency of growth in the field of pollution with different biogenic elements in waters of Dniester river that are characteristic for those present in the Raut river, which is a real danger to the ecosystem of the river.