خيارات البحث
النتائج 421 - 430 من 448
Algological research of the Novo Ilje 1 and Novo Ilje 2 near Melenci (Vojvodina, Serbia)
2007
Fuzinato, S.,Univerzitet u Beogradu, Beograd (Serbia). Bioloski fakultet | Fodora, A.,Univerzitet u Beogradu, Beograd (Serbia). Bioloski fakultet | Subakov-Simic, G.,Univerzitet u Beogradu, Beograd (Serbia). Bioloski fakultet | Krizmanic, J.,Univerzitet u Beogradu, Beograd (Serbia). Bioloski fakultet
The puddles Novo Ilje 1 and Novo Ilje 2 are aquatic ecosystems periodically filled with moderate salt and alkaline water. In 2003 and 2004 quantitative analysis show the Euglenophyta domination. Trachelomonas taxa are the most common. The algae in planktonic communities are the most numerous in both puddles in researched years.
اظهر المزيد [+] اقل [-]Impact of hydromorphological alterations on ecological status of nature park Ponjavica [Serbia]
2007
Trifunov, S.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Planojevic, I.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Jurca, T.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Nemes, K.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Teodorovic, I.,Prirodno-matematicki fakultet, Novi Sad (Serbia)
Ecological status of protected area of Ponjavica water body, evaluated using hydromorphological, basic physico-chemical and selected biological quality elements, can be indicated as very bad. The accerelated eutrophication process this water body (once running now stragnant water) undergoes, leads to hypereutrophic current condition, with clear trend towards dystrophy.
اظهر المزيد [+] اقل [-]Distribution of components ass. Scirpo-Phragmitetum, Koch 1926, through the flow of the river Moravica [Serbia] and their indicative values
2007
Milenovic, V.,Osnovna skola Vuk Karadzic, Zitkovac (Serbia) | Randelovic, N.,Prirodno-matematicki fakultet, Nis (Serbia)
During the research of the flora of the river Moravica methodology of ass. Scirpo-Phragmitetum, Koch 1926, subass. typhetosum latifoliae, Pignotti 1953, with differential typa Typha latifolia with related marshy plants was applied. The community is developed as small units in the lower flow of the river Moravica (the part flowing through the town Aleksinac), where the anthropogenic influences are significant due to the empting of the sewage and industrial polluted waters of the town Aleksinac. Many diffuse forms of pollution are also present, particularly in the form of illegal dumps. Waste waters represent serious load on the recipient river and influence qualitative and quantitative content of the phytocenosis. Ecological index of the community shows change in water quality and presence of organic substances (above all nitrogen compounds) in the water and the riverbed ass. Scirpo-Phragmitetum, Koch 1926, subass. typhetosum latifoliae, Pignotti 1953, which indicates the riverbed loaded with organic substances (mezotrophic plants, N=3.50)
اظهر المزيد [+] اقل [-]Benthic community and phytoplankton in freshwater quality assessment of Jegricka protected area [Serbia]
2007
Miljanovic, B.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Jurca, T.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Mijic, I.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Pankov, N.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Sipos, S.,Prirodno-matematicki fakultet, Novi Sad (Serbia)
Composition of benthic macroinvertebrates and phytoplankton were examined during the period of July-November 2006, for purposes of freshwater quality assessment in protected area of Jegricka water body. Results of research show intensive sedimentation of organic matter in river bed, which is caused by eutrophication processes and small flow velocity in this canalized river of Vojvodina.
اظهر المزيد [+] اقل [-]Market aspects of waterworks - theory of natural monopoly
2007
Nestorovic, Z.,Hidroenergetski i plovidbeni sistem Djerdap 1, Kladovo (Serbia)
Scarce natural resources which are important for development of society or civilization itself are the issue of research for economists from the point of view of their efficient utilization. Theory of natural monopoly asserts that for society is better to treat scarce resources as monopoly than to put them on free market. The assertion is that it is better to invest in development of other markets than into free competition in sphere of some scarce resources. Main aim of this paper is to overview some elements of theory of natural monopoly.
اظهر المزيد [+] اقل [-]PAH metabolites in bile fluids of dab (Limanda limanda) and flounder (Platichthys flesus): spatial distribution and seasonal changes النص الكامل
2007
Kammann, Ulrike
Chemistry and microbiology of Ranney well RB-7 encrustation in the Sava river alluvion [Serbia]
2007
Petkovic, A.,Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia) | Obradovic, V.,Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia)
Iron-related well-screen encrustation and aquifer biofouling has decreased the specific capacity of RB-7 well. This paper describes the role of iron-related bacteria in the encrustation process and relates their occurrence to chemical conditions in the well.
اظهر المزيد [+] اقل [-]BART tests in groundwater quality monitoring
2007
Obradovic, V.,Institut za vodoprivredu Jaroslav Cerni, Beograd (Serbia) | Petrovic, O.,Prirodno-matematicki fakultet, Novi Sad (Serbia). Departman za biologiju i ekologiju
Water wells are among the oldest hydraulic engineering structures in the world. Today, hundreds of water wells service water supply systems in Serbia, and groundwaters are widely used for public water supply. Extensive practical engineering experience in water well operation has identified a number of problems which affect well service life and capacity (i.e. reduce specific yield). Some of the encountered problems are, also, a result of microbial activity in groundwater. Products of life processes of groundwater specific microbial community cause biocorrosion, blockage, closure, plugging, deposition, and biofouling of well screens and collectors. We applied BART biodetectors as a reliable tool in monitoring well rehabilitation effectiveness. This paper presents several process assessments based on BART biodetector tests conducted at Belgrade groundwater source.
اظهر المزيد [+] اقل [-]Filamentous bacteria in Subotica [Serbia] wastewater treatment plant activated sludge
2007
Burger, B.,JKP Vodovod i kanalizacija, Subotica (Serbia) | Reh, Z.,JKP Vodovod i kanalizacija, Subotica (Serbia)
Filamentous bacteria are commonly found in activated sludge. If numerous, they can cause bulking problems. In order to control their number in a system detailed identification of filaments is necessary. In Subotica Wastewater Treatment Plant (WWTP) daily analyses of filamentous bacteria were performed from January 2006 till March 2007. The dominant and constantly abundant was Thiothrix sp. The filaments of Haliscomenobacter hydrosis and Type 1863 were also common (moderately numerous with periods when develop massively). Nostocoida limicola was frequent, but not numerous. Sphaerotilus natans was numerous in some periods when even dominant. Type 1701, Beggiatoa sp. and nocardioform actinomycetes were rarely found and were not abundant.
اظهر المزيد [+] اقل [-]Sea urchin gametes, early embryos and larvae as biosensors for screening and detailed study for environmental neurotoxicants and pollutants
2007
Milosevic, I.,Institut za biologiju mora, Kotor (Montenegro) | Buznikov, G.,N.K. Koltzov Institute of Development Biology, Moscow (Russian Federation) | Nikitina, L.,University of North Caroline, Chapel Hill, North Carolina (USA). School of Medicine, Dept. Cell and Developmental Biology | Lazarevic, L.,Institut za biologiju mora, Kotor (Montenegro) | Rogac, Lj.,Institut za biologiju mora, Kotor (Montenegro) | Gojkovic, M.,Institut za biologiju mora, Kotor (Montenegro) | Bezuglov, V.,M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Moscow (Russian Federation) | Milosevic, N.,Medicinski fakultet, Beograd (Serbia) | Rakic, Lj.,Srpska akademija nauka i umetnosti, Beograd (Serbia)
Sea urchin gametes, embryos and larvae can be used for quick, cheap and reliable screening and testing of pharmacologically active substances and pollutants. The results obtained are in many cases applicable to mammals including humans.
اظهر المزيد [+] اقل [-]