Diferencijacija prednjeg krila medonosne pčele iz Srbije

In this study, 12 morphological characteristics were measured on worker bee samples collected from seven different locations covering the territory of Republic Serbia. The measurement of 11 angles on the front wing and cubital index was done with stereo microscope Leica XTL-3400D, and software package IL 1009 in accordance with the standard method. The results showed significant differences between the groups of bees and investigation of angles on the forewing could be contributed to a clearer separation of groups of bees inside domestic population.U ovom istraživanju mereno je 12 morfoloških karakteristika prednjeg krila pčela radilica u skladu sa metodama Ruttner i sar. (1978). Uzorci pčela radilica su prikupljeni sa 7 različitih lokacija čime su pokriveni glavni pčelarski regioni na teritoriji Republike Srbije. Morfometrijska istraživanja pokazala su da pčele iz Zapadno Bačkog regiona u Vojvodini imaju najveću vrednost uglova B4 (113,17º), D7 (100,10º), E9 (24,28º), K19 (79,60º) i najveći kubitalni indeks (2,92). Iste pčele se na osnovu multivarijantne diskriminantne analize najviše razlikuju od grupe pčela sa Kosova. Na osnovu analize varijanse, utvrđeno je da postoji vrlo značajna razlika (P lt 0.01) u 7 morfoloških karakteristika između grupa pčela sa izabranih lokaliteta. Može se zaključiti da utvrđene vrednosti za ispitivane karaktere ukazuju na postojanje značajne varijabilnosti i impliciraju na postojanje subpopulacija uslovljenih delovanjem čoveka

Varijabilnost proizvodnih osobina izdvojenih linija pčela u zapadnoj Srbiji

Condition for achieving high performance results in beekeeping is focused on the use of high-quality breeding queen bee. Because that a large amount of research are based on the examination of properties of selected lines of bees and choosing the best queen mothers in the aim of selection and improving the production characteristics of honey bees from the territory of Serbia. The amount of bees, brood, honey and pollen was investigated in two spring and one autumn survey and productivity controlled in the pasture of accacia. Line 1 had the greatest amount of brood (1.23, 4.04 and 5.39), while line 3 had the best spring development. The best quality of brood in all three exams had the lines 1 and 3 (3.00, 3.00 and 2.95) as well as the best productivity compared to the average yield of all other three lines. All tested lines were exhibited variability, which provides enough possibility for their further improvement and single out the mother queenbees with best results.U dvogodišnjem istraživanju ispitivano je četiri odabrane linije medonosne pčele na području Zapadne Srbije. Proizvodne karakteristike praćene su prema standardnoj metodologiji. Na osnovu rezultata istraživanja utvrđeno je da je najveću površinu pčela imala linija 1 (u jesenjem i prvom prolećnom pregledu: 2,10 i 3,27 rama), dok je u drugom prolećnom pregledu najviše pčela imala linija 3 (6,19 rama). Utvrđene razlike u površini pčela nisu bile statistički značajne (P>0.01). Najbolji prolećni razvoj legla između prva dva prolećna pregleda utvrđen je u liniji 3 (povećanje za 1,4 rama) i liniji 1 (povećanje za 1,35 rama). Najveću površinu meda i polena imala su društva linije 1. Najbolji kvalitet legla, po pregledima utvrđen je u linijama 1 i 3. Na osnovu rezultata istraživanja, utvrđeno je da su linija 1 i 3 imale najbolje proizvodne karakteristike. Postojeća varijabilnost ispitivanih karakteristika pčela pruža mogućnost daljeg usavršavanja linija i širenja genetskog napretka na području Srbije, pri čemu prednost treba dati umnožavanju matica na bazi biološkog materijala pčela linija 1 i 3

Uloga ranog i predškolskog odgoja i obrazovanja u razvoju socijalne kompetencije romske djece

This research is based on the assumption that the social competences acquired in early childhood serve as a prerequisite for a successful social interaction during primary education. This type of competence can be a challenge for children who come from marginalized groups that are very often isolated within the society. The aim of the research was to determine whether a longer stay in the institution of early childhood and preschool education contributes to a higher development of social competences of Roma children. The research was conducted with primary school teachers evaluating the social competences of sixty Roma children in the second grade. Subsamples consisted of thirty children who had been included in the early childhood and preschool education system for two years, and thirty children who had been included in the system for one year. The results indicate that the participants do not exhibit those behaviours that point to social competence frequently enough. The research results do not indicate a statistically significant correlation between the children’s social competence and their length of stay in an institution of early childhood and preschool education. A disadvantage of this research is that it is based on a subjective assessment.Istraživanje se temelji na pretpostavci da socijalna kompetencija stečena u ranom djetinjstvu služi kao preduvjet uspješnih društvenih interakcija tijekom osnovnog obrazovanja. Ta vrsta kompetencije može biti izazov za djecu koja dolaze iz marginaliziranih skupina koje su vrlo često izolirane unutar društva. Cilj istraživanja bio je utvrditi postoji li povezanost duljine boravka u ustanovi ranog i predškolskog odgoja i razvoja socijalnih kompetencija romske djece. Istraživanje je provedeno s učiteljima osnovnih škola koji su procjenjivali socijalnu kompetenciju šezdeset romske djece u drugom razredu. Poduzorci su uključivali tridesetero djece koja su bila uključena u sustav ranog i predškolskog odgoja i obrazovanja dvije godine i tridesetero djece koja su bila uključena u sustav ranog i predškolskog odgoja i obrazovanja godinu dana. Rezultati upućuju na to da sudionici često ne pokazuju ona ponašanja koja upućuju na socijalnu kompetenciju. Rezultati istraživanja ne ukazuju na statistički značajnu povezanost između socijalne kompetencije djece i njihove dužine boravka u ustanovi ranog i predškolskog odgoja

Korelacija morfoloških i proizvodnih osobina društava medonosne pčele sa područja Srbije

State of mutual or reciprocal relationship between traits is determined by the correlation coefficients. Correlation of morphological and production traits was determined in two generations of honey bee colonies. In the first generation, mother queen bees were studied, and in the second generation, their offspring. The study of one generation lasted two years. Morphological traits were determined in the beginning of the study and production traits were determined in the spring and autumn inspections of every year. In the first generation, the positive and mostly high correlation between morphological traits, and honey yield and hygienic behavior was determined. Correlation of morphological traits, colony strength and food supplies per colony ranged from highly positive to slightly negative values. It was found that there was a high correlation between some production traits (colony strength in the spring and autumn inspections and honey yield per colony). In the analysis of offspring (second generation), most traits that were positively correlated in mother generation now, also, showed a similar relationship. The only difference, in contrast to mother generation, was that, for most traits, the intensity of interaction increased.Stanje uzajamne ili recipročne povezanosti jedne osobine od druge utvrđuje se na osnovu koeficijenta korelacije. Korelacija morfoloških i proizvodnih osobina utvrđivana je kroz dve generacije društava medonosne pčele. U prvoj generaciji praćene su majke matice, a u drugoj njihovo potomstvo. Ispitivanje po jednoj generaciji trajalo je dve godine. Morfološke osobine su utvrđene na početku praćenja generacija, a proizvodne na prolećnom i jesenjem pregledu svake godine. U prvoj generaciji utvrđena je pozitivna i mahom visoka korelacija između morfoloških osobina, prinosa meda i higijenskog ponašanja. Stepen korelacije morfoloških osobina, snage društva i zaliha hrane po društvu bio je od visoko pozitivne do slabo negativne vrednosti. Ustanovljeno je da postoji i visok stepen korelacije između pojedinih proizvodnih osobina (snaga društava na prolećnom i jesenjem pregledu i prinosa meda po društvu). Prilikom testiranja potomstva (II generacija) većina osobina koje su bile u pozitivnoj korelaciji kod roditelja i sada su pokazivala uzajamni odnos. Jedina razlika u odnosu na roditelje je u tome da se, za većinu osobina, intezitet međusobnog uticaja povećao

Mechanical characteristics of compressive specimens obtained by SLS technology

The purpose of this research is to investigate the mechanical properties of Additive Manufacturing(AM)parts. The 3D printer used in this study is Fuse 1 (FormLabs, Summerville, MA), which utilizes theSLS(Selective Laser Sintering) technology. This technology allows the production of objects with different shapesand dimensions simultaneously, provided that they are printed at a minimum distance of 5 [mm] apart. Thepowder layer thickness during printing was 110 microns. The mechanical characteristics of a specifictypeofspecimen, which conforms to the ISO 604 standard for compressive specimens, were examined. Thecompressive specimens have dimensions of Ø10x20 [mm]. Four batches of specimens were produced, eachdiffering in printing orientation (i.e. horizontal and vertical) and printing location (i.e. printed on the edgeandin the middle of the powder bed). The material used for printing the specimens is polyamide (PA12), whichhas a compressive strength is 13/24/55 MPa at 1%/2%/5%. The specimens were subjected to a standardtensiletesting machine (SHIMADZU AGS-X 100kN) after printing. Furthermore, the results of the testing also showed significant variations in the compressive strengthofthe specimens at different levels of elongation. At 1% and 2% elongation, the compressive strengthvaluesdisplayed large deviations, which suggests that the parts may not be able to withstand highlevelsofdeformation at these points. However, at 5% elongation, the values were much closer to the expectedvaluesfound in the literatur

Prerada biološki razgradivog otpada primenom aerobnog fermentatora EWA

The paper presents research results obtained in the process of processing biodegradable wastes, resulting from agricultural production as well as municipal waste. Aerobic fermenter EWA (stationed within the Institute for Forage Crops Globoder- Kruševac) was using for this purpose, during the one month testing. Biodegradable material with different ratios of components was used for filling aerobic digester. EWA fermenter is certified device that is used to stabilize and hygienic disposal of biodegradable waste, including sewage sludge and animal products produced in accordance with European Union regulations. Fermenter is intended to be used for combustion in boilers for solid fuels with humidity of biomaterials below 30%.Rad prikazuje rezultate istraživanja koji su dobijeni pri procesu prerade biološki razgradivog otpada dobijenog iz poljoprivredne proizvodnje, kao i komunalnog otpada primenom aerobnog fermentatora EWA (češke proizvodnje stacioniranog u krugu Instituta za krmno bilje u Globoderu-Kruševcu). U toku jednomesečnog ispitivanja vršeno je punjenje aerobnog fermentatora biološki razgradivim materijalom s različitim odnosom komponenata. EWA fermentator je sertifikovan uređaj koji se koristi za stabilizaciju i higijenizaciju biorazgradivog otpada, uključujući kanalizacioni mulj i proizvode životinjskog porekla proizveden u skladu sa propisima Evropske Unije. Fermentator može da se koristi i za dobijanje biogoriva namenjenog za sagorevanje u kotlovima za čvrsta goriva pri čemu je vlažnost biomaterijala koji se koristi ispod 30%

Floating-Gate MOS Transistor with Dynamic Biasing as a Radiation Sensor

This paper describes the possibility of using an Electrically Programmable Analog Device (EPAD) as a gamma radiation sensor. Zero-biased EPAD has the lowest fading and the highest sensitivity in the 300 Gy dose range. Dynamic bias of the control gate during irradiation was presented for the first time; this method achieved higher sensitivity compared to static-biased EPADs and better linear dependence. Due to the degradation of the transfer characteristics of EPAD during irradiation, a function of the safe operation area has been found that determines the maximum voltage at the control gate for the desired dose, which will not lead to degradation of the transistor. Using an energy band diagram, it was explained why the zero-biased EPAD has higher sensitivity than the static-biased EPAD

First Report of Peyronellaea lethalis Associated With Ascochyta Blight Complex of Field Pea in Serbia

Ascochyta blight complex is a significant and widespread disease of field pea (Pisum sativum L.) caused by Peyronellaea pinodes, P. pinodella, and Ascochyta pisi. During the 2015 growing season, screening of isolates revealed a previously unknown member of this complex. Thirteen single-conidial isolates were obtained using standard phytopathological protocols. To our knowledge, this is the first report of P. lethalis associated with Ascochyta blight complex of field pea in Serbia

Impossibility of the treatment of inoperable liver multicystic echinococcosis due to adverse reactions to antihelminitics

Introduction. In some cases of multicystic forms of liver echinococcal disease, the advanced method for treatment of cystic echinococcosis faces great problems relating to the final outcome of the treatment. Case report. In May 2005, a computerized tomography of the abdomen obtained in a 27-year -old famale patient with abdominal pain revealed more than 20 echinococcal cysts measuring up to 6.7 cm in both lobes of the liver. Laboratory analyses found the value of eosinophils 6.8%, gamma globulins 29.9%, immunoglobulin E 29 600 IU/mL and the indirect hemagglutination for echinococcosis 1 : 8 196. The treatment started in December that year with the continuous administration of a daily dose of 800 mg (14.5 mg/kg body weight) of albendazole, but it was terminated two months later due to high serum transaminases values. By the end of 2006, the largest cyst detected in the left lobe of the liver had a diameter of 5.7 cm and the one in the right lobe of the liver measured 4.1 cm. There were lesions of germinative membrane found on both cysts. Six months later, praziquantel at daily dose of 2 500 mg (45.3 mg/kg body waight) was introduced into the therapy, but the treatment was terminated after eight days because of the development of exanthema. The computerized tomography of the abdomen obtained in February 2008 revealed the presence of a large number of echinococcal cysts in the liver. The largest among those cysts measured 3.5 cm while calcifications of the cyst walls were observed on some of them. None of the remaining therapeutic options for further treatmetnt of echinococcal disease could be applied. Conclusion. The presented case confirms medical therapy as the only option for the treatment of some forms of cystic echinococcosis. Benzimidazole carbamates (albendazole, mebendazole) and praziquantel are only efficacious antihelminitics currently available, and when they have to be withdrawn due to serious adverse offects, futher treatment of a patient with liver multicystic echinococcosis is impossible. Because of that there is a need to search for new and more efficient drugs for the treatment of ehinococcal disease