Promena strukture setve u funkciji unapređenja konkurentnosti porodičnih gazdinstava usmerenih na finalnu proizvodnju utovljene junadi

The aim of this paper is to examine the impact of sowing structure on family farm competiveness using the model of family farm directed at the final production of fattened beef cattle in the conditions of unchanged estate size. Applying a partial budget analysis, it was examined whether the decision on buying alfalfa hay or mercantile maize on the market and changing the sowing structure was economically justified and under what conditions using additional procedure of sensitive analysis. Applying this approach, it was investigated to what extent that decision contributed to improving the family farm profitability. The results of the conducted research show that the decision on buying mercantile maize mainly contributes to improving competitiveness of family farms directed at the final production of fattened beef cattle compared with the decision on buying alfalfa hay. It is the consequence of the fact that buying mercantile maize on the market will enable sowing structure changes, that is, buying mercantile maize will make the area free, which according to some conservative estimations, can be used for the production of sufficient amounts of alfalfa and silage maize for fattening of additional 19 head, whereas buying alfalfa hay will make the area free, which can be used for production of sufficient amounts of mercantile and silage maize for fattening of additional 6 head. In addition, it is shown that more rational way of organizing family farms directed at the final production of fattened beef cattle can additionally use available land resources and in that way increase profitability and improve competitiveness.Cilj ovog rada je da se u uslovima nepromenjene veličine poseda na modelu porodičnog gazdinstva usmerenog na finalnu proizvodnju utovljene junadi ispita uticaj promene strukture setve na konkurentnost porodičnog gazdinstva. Primenom diferencijalne kalkulacije ispitano je da li je odluka o kupovini sena lucerke ili merkantilnog kukuruza i promeni strukture setve ekonomski opravdana, a dodatnim postupkom senzitivne analize i pod kojim uslovima. Primenjujući ovakav pristup utvrđeno je u kojoj meri ova odluka utiče na konkurentnost gazdinstva. Rezultati sprovedenog istraživanja pokazuju da odluka o kupovini merkantilnog kukuruza u većoj meri doprinosi unapređenju konkurentnosti porodičnih gazdinstava usmerenih na finalnu proizvodnju utovljenih junadi u odnosu na odluku o kupovini sena lucerke. To je posledica činjenice da kupovina merkantilnog kukuruza na tržištu omogućava promene u strukturi setve tj. da se kupovinom merkantilnog kukuruza oslobađa površina na kojoj je prema nekim konzervativnim procenama moguće proizvesti dovoljno lucerke i silažnog kukuruza za tov dodatnih 19 grla, dok se kupovinom sena lucerke oslobođa površina na kojoj je moguće proizvesti dovoljno merkantilnog i silažnog kukuruza za tov dodatnih 6 grla. S tim u vezi, pokazano je da uz racionalniji način organizovanja porodična gazdinstva usmerena na finalnu proizvodnju utovljene junadi mogu dodatno iskoristiti raspoložive zemljišne resurse i na taj način poboljšati profitabilnost i unaprediti konkurentnost

Races and hosts of Pseudomonas syringae pv. tomato in Serbia

During the past few years, frequent appearance of bacterial speck of tomatoes was recorded in several tomato-growing regions in Serbia. A three-year survey of tomato fields in Serbia (2002-2004) resulted in the isolation of numerous bacterial strains, with 30 representative strains selected for further analyses. Based on the results of pathogenicity, biochemical, and physiological tests, all strains isolated from diseased tomato plants were identified as P. syringae pv. tomato. The identity of strains was confirmed by the polymerase chain reaction (PCR), since PCR products of expected size (650 bp) specific for coronatine-producing strains of P. syringae pv. tomato were amplified from all tested strains. Study of the host range of P. syringae pv. tomato strains originating from Serbia confirmed tomato as the sole host. The reaction of tomato differential cultivar Ontario 7710 showed that the Serbian strains belonged to races 0 and 1 of P. syringae pv. tomato

Structure and immunohistochemistry of the human lenticulostriate arteries

Background: Data about the structure and immunohistochemistry of the lenticulostriatearteries (LSAs), although very important for medical research and clinicalpractice, have been rarely reported in literature.Materials and methods: Fourty serially sectioned LSAs were stained with hematoxilinand eosin, and prepared for immunohistochemistry.Results: Our examination revealed a typical endothelial lining and a narrow subendothelialspace with subintimal smooth muscle cells occasionally. The internalelastic lamina was fragmented or absent in the smallest LSAs branches. The mediacoat, with a mean diameter of 148.5 μm, contained typical smooth muscle cellswhich formed 14.2 layers on average and showed a positive immune reactions foralfa-actin, desmine, laminin and collagen IV. The thin adventitial coat containedfibroblasts, collagen fibers, and nerve bundles, with the strongest immunopositivityto thyrosin hydroxilase. The immune reactions against CD31 and CD34 proteins,endothelial nitric oxide synthase, S 100 protein, neurofilament protein and synaptophysin,seem to be performed in the LSAs wall for the first time. Similarly,the thickness of the LSAs wall and its coats have never been reported, nor thenumber of the smooth muscle cell layers.Conclusions: Our results related to the structure and immunohistochemistry ofthe LSAs could be important in cerebrovascular pathology, neurology and neurosurgery

Changes of c-myc expression in b16 melanoma cells induced by 8-chloroadenosine-3′, 5′-monophosphate and tiazofurin

The aim of this study was to investigate the in vitro effects of 8- chloroadenosine 3′, 5′-monophosphate (8-Cl-cAMP) and tiazofurin (TR) on the expression of c-myc gene in B16/F10 and B16/C3 mouse melanoma cells. Exponentially growing cells were treated with 8-Cl-cAMP or TR (5µmol - 25µmol) for 6h and 24h. The level of c-myc expression, estimated by RT-PCR, did not significantly change in B16/F10 cells after treatment with 8-Cl-cAMP or TR. Similar results were obtained in B16/C3 cells after treatment with 8-Cl-cAMP. The level of c-myc expression has shown a significant increase in B16/C3 cells after treatment with TR. Further studies of these agents will lead to better understanding of molecular mechanisms of their action.Physical chemistry 2004 : 7th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 21-23 September 200

Self-diffusion of Cd++ Ions in Hydrated CdX Zeolite

The fractional attainment of the isotopic equilibrium between a Cd(N03)2 solution and a 115Cd-labelled CdX zeolite has been measured as a function of time, particle size of zeolite and temperature. The experimental kinetic data have been interpreted in terms of the Brown-Sherry-Krambeck model and the self-diffusivities and diffusional activation parameters of Cd++ ions in zeolite CdX have been calculated

Privredno tehnološke karakteristike novointrodukovanih interspecies hibrida vinove loze

Results obtained by examining the most important commercial and technological characteristics for five introduced table grapevine cultivars, interspecies hybrids (Frumoasa, Rusmol, Vitjan, Vostorg and Kodrijanka) are represented in this paper. Cultivars were reciprocal compared. Obtained results showed considerable variation in respect of examined characteristics, but contemporary showed ability for successful growing in Grocka-vineyards-area conditions, and in other vineyards-area with the similar agro ecological conditions.U radu su predstavljeni rezultati ispitivanja najvažnijih privredno tehnoloških osobina za pet introdukovanih stonih sorti interspecies hibrida (Frumoasa, Rusmol, Vitjan, Vostorg i Kodrijanka). Sorte su međusobno upoređivane. Dobijeni rezultati pokazuju znatna variranja u pogledu ispitivanih karakteristika, ali istovremeno ukazuju na mogućnost uspešnog gajenja u uslovima gročanskog vinogorja kao i drugim vinogorjima sličnih agroekoloških svojstava

Trophic relations between macroinvertebrates in the Vlasina river (Serbia)

The aim of the study presented was to define trophic relationships within the benthic community according to functional feeding groups (FFG) in the Vlasina River (Southeast Serbia), with an attempt to use those results to describe the watercourse. In an investigation performed during 1996, a total of 125 macrozoobenthic taxa were identified, 95 of which were included in FFG analyses. Although the investigated part of the river, in its physical and chemical characteristics, as well as characteristics of the benthofauna, generally corresponds to what could be expected, certain variations of faunal composition were observed along the river. Two groups of sites were separated by FFG analysis - sites on the upper section of the river and on a tributary (the Gradska River) comprised one group, while the remaining sites made up the other.Cilj nam je da ovim radom prikažemo trofičke odnose u zajednici makroinvertebrata prema funkcionalnim grupama u ishrani (FGI) u reci Vlasini (jugo-istočna Srbija) i te rezultate upotrebimo za opisivanje vodotoka. U okviru istraživanja obavljenih tokom 1996. godine, od ukupno 125 identifikovanih taksona makrozoobentosa, 95 taksona korišćeno je u FGI analizi. Iako istraživani deo reke, sa njegovim fizičkim i hemijskim karaktristikama, kao i karakteristikama bentofaune uopšte, odgovara srednjem toku reka, istraživane su fine promene u distribuciji bentofaune duž toka. Izdvojile su se dve grupe lokaliteta prema FFG analizi - grupisali su se lokaliteti gornjeg sektora reke kao i pritoka Gradska reka, dok su ostali lokaliteti formirali drugu grupu.nul

Effect of clindamycin in a model of acute murine toxoplasmosis

Objective: To characterize the antitoxoplasma activity of clindamycin in a murine model of acute toxoplasmosis. Methods: Rates of survival and mean survival times of Swiss Webster mice infected intraperitoneally with 106-102 tachyzoites of the RH strain of Toxoplasma gondii treated with clindamycin or sulfamethoxazole (positive control) or untreated (negative control) were compared. Survivors were submitted to examination of untreated brain tissue preparations, intraperitoneal and peroral subinoculations of brain tissue homogenates into fresh mice, and to pathohistology, including immunohistochemistry, of brain and lungs. Results: The effect of clindamycin treatment (400 mg/kg/day) on infected Swiss Webster mice was inoculum size dependent, ranging from no survivals in animals infected with 106 parasites, to 100% survivals with an inoculum of 102. Treatment initiated 24 h before and at time of infection prolonged mean survival times comparably to sulfamethoxazole, and significantly when compared to untreated controls. In contrast, treatment initiated 48 h postinfection with an inoculum of 106 did not postpone death. In the clindamycin-treated survivors, there was no biological or histologic evidence for the persistence of toxoplasma. Conclusions: The results obtained show that at an appropriate parasite dose/drug dose ratio, clindamycin is strongly toxoplasmacidal in a murine model of acute toxoplasmosis

Examination of Prooxidative Activity of Red Wine in Melanoma Cells

Melanoma is responsible for 75% of all deaths from skin cancer. Its lethality arises from its rapid progression, easy metastasis and drug-resistance as well. Red wine is a natural product rich in polyphenolic compounds with potent anticancer activities. It seems that in cancer cells these compounds behave as prooxidants initiating reactive oxygen species mediated cellular DNA breakage and consequent cell death. The aim of this study was to investigate prooxidative activity of red wine samples (Merlot variety, commercial as well as VCR1 and VCR101 clonal wines) in melanoma A375 cells, through measuring the relationship of reduced and oxidized form of glutathione (GSH/GSSG) and comparison with the GSH/GSSG ratio in control (untreated melanoma cells). The data obtained showed that tested red wine samples decrease GSH/GSSG ratio in A375 cells compared to control (4.6 ± 0), with the largest decrease noticed in treatment with VCR101 wine (0.66 ± 0.05)

Directional asymmetry estimates developmental instability in plants: A case report in Plantago major L. leaves

In the present study, an additional approach was used to evaluate the potential effects of the industrial development on natural population of the common plantain (Plantago major L.), previously estimated using si2 as an index of fluctuation asymmetry (FA) together with the coefficient of variation (CV). In this study, directional asymmetry (DA), a form of asymmetry in bilaterally symmetric traits, was used in order to estimate its rule as a potential indicator of developmental instability in leaf traits. Obtained results shows significantly higher DA values for the vein distances within a leaf (VD) on environmentally stressed area than in the control site. Reporting significantly higher values of DA for VD on the environmentally stressed sample and a positive relationship between FA and CV values obtained for the same trait within the same site, in a previous study, the study corroborates the potential of DA as an indicator of developmental perturbations.U ovom radu, korišćen je dodatni pristup u proceni potencijalnih efekata industrijskog razvitka na prirodne populacije obične bokvice (Plantago major L.) prethodno procenjenih korišćenjem (Oi2) indeksa fluktuirajuće asimetrije (FA) i koeficijenta varijabilnosti (CV). U ovoj studiji procenjena je uloga direkcione asimetrije (DA), oblik simetrije bilateralno simetričnih karaktera, kao mogućeg indikatora razvojne nestabilnosti karaktera lista. Dobijeni rezultati pokazuju značajno veću vrednost DA za karakter: rastojanje među venama unutar lista (VD) na stresnom području u odnosu na kontrolni lokalitet. Ukazujući na značajno veće vrednosti DA za VD za uzorak sa stresnog lokaliteta i pozitivan odnos između vrednosti FA i CV za VD u prethodnoj studiji, ova studija ide u prilog korišćenju DA kao indikatora sredinskih poremećaja.nul