New records of the tribe Bryobiini berlsese (Acari: Tetranychidae: Bryobiinae) from Serbia, with notes about associated predators (Acari: Phytoseiidae)

This paper gives an overview of the present knowledge and some new faunistic and zoogeographic data of the insufficiently researched tribe Bryobiini in Serbia. In Serbia, this group of mites is represented by eight species, including four species new to Serbian fauna: Bryobia angustisetis Jakobashvili, B. lagodechiana Reck, B. ulmophila Reck and B. vasiljevi Reck. New data on host plant species and families have also been obtained - two new host plant species for B. angustisetis, two host plant species and two host plant families for B. graminum, one host plant species for B. lagodechiana, four host plant species and one host plant family for B. rubrioculus, two host plant species and one host plant family for B. ulmophila, and one host plant species for B. vasiljevi. This overview was supplemented with data on the other groups of leaf-inhabiting mites that coexist with Bryobiini species. Statistical analysis of interspecific association was done to determine the role of 15 associated predatory mite species belonging to the families Phytoseiidae, Anystidae and Trombidiidae

Analysis of the grade of esophagitis, chromendoscopical and histological findings of esophagus in patients with gastroesophageal reflux disease before and after the therapy

Background/Aim. The symptoms of gastroesophageal reflux desease (GERD) are among the most common complaints for which patients are indicated for visiting gastroenterologist. It occurs as a result of the effect made by gastric reflux contents that moves into the esophagus. The prevalence of all forms of GERD is 40%. The aim of this study was to analyze the grade of esophagitis, chromendoscopical and histological findings of esophagus in patients with GERD before and after the therapy. Methods. A prospective study included 90 patients with symptoms of GERD, divided into 2 groups depending on whether they had endoscopic signs of gastroezophageal reflux (group ERD), or not (group NERD). All the patients had esophagogastroduodenoscopy, chromoendoscopy staining, test for Helicobacter pylori and histological findings of the esophagus. In the patients with Helicobacter pylori infection eradication therapy was done. Results. Esophagitis-B level was present in most of the patients. Among the groups, roughly the same number responded to positive findings on chromoendoscopy. After the therapy, chromoendoscopy was significantly negative in both groups of the patients comparing to chromoendoscopy before the therapy (p = 0.00001). Multiplication and elongation of papilla, basal cell hyperplasia, vascular dilatation, increasing of mitotic activity and the presence of polymorphonuclear leukocyte cells were statistically more frequent histological findings in the group ERB compared to the group NERB. After the therapy, the patients in both groups had statistically less histological findings of appropriate esophageal parameters. Conclusion. Chromoendoscopy combined with the standard endoscopy increases the sensitivity and specificity for reflux disease. Histology in the reflux disease is associated with endoscopic and clinical findings so that the localization of taking biopsies and histological criteria of pathohistological changes must be clearly defined. Multiplication and elongation of papilla, basal cell hyperplasia and the presence of polymorphonuclear leukocytes are the most relevant criteria in the diagnosis NERD

Zaštitna arheološka istraživanja na lokalitetu Rosulja u Suševlju kod Vladičinog Hana

Kratak izveštaj o zaštitnim arheološkim istraživanjima na lokalitetu Rosulja kod Vladičinog Hana

Razvoj modela za predviđanje temperatura površine kolovoza primenom neuronskih mreža

Effects of climate factors onto pavement constructions are very noticable since they are exposed to their impact. It is important to determine the factor and to what extent it makes its impact, both to the lifespan of the pavement construction as well as to the traffic safety - especially during the winter months. Earlier researches have established that the ambient temperature is one of the most important factors. Many researchers have created models that predict pavement temperatures depending on one or several factors, since it has been proven that the pavement temperature affects physical and mechanical characteristics of pavement. Therefore, we have to be aware of the t surface pavemen temperature, but also on a depth, aiming to reach the best design possible, select appropriate construction material and road maintenance. Previous models have mainly been created using statistical methods. This paper shows a model that predict surface pavement temperature using neural networks.Uticaj klimatskih faktora na kolovozne konstrukcije je posebno izražen jer su direktno izloženi njihovom uticaju. Bitno je utvrditi koji faktor i koliko utiče, kako na životni vek kolovozne konstrukcije tako i na bezbednost saobraćaja - posebno u zimskim mesecima. Ranijim istraživanjima je utvrđeno da je ambijentalna temperatura vazduha jedan od najvažnijih činilaca. Mnogi istraživači su pravili modele kojima se predviđa temperatura kolovoza u zavisnosti od jednog ili više faktora, pošto se pokazalo da temperatura kolovoza utiče na fizičko-mehaničke karakteristike kolovoza. Stoga je potrebno poznavati temperaturu površine kolovoza, ali i na određenoj dubini, a u cilju što kvalitetnijeg projektovanja, izbora odgovarajućih materijala i kasnijeg održavanja kolovoza. Raniji modeli su uglavnom formirani pomoću statističkih metoda. U ovom radu je prikazan model koji predviđa temperaturu površine kolovoza pomoću neuronskih mreža

Management of Non-Classic Congenital Adrenal Hyperplasia in Pregnant Woman - Non-Referral Center Experience- Case Report

Congenital adrenal hyperplasia (CAH) is a rare autosomal recessive disorder with mutations in genes involved in cortisol and aldosterone production. Based on overall 21-OHase activity, CAH is divided into classic (C-CAH) and non-classic (NC-CAH). Females who suffered from NC-CAH have had increased infertility rates and higher miscarriage susceptibility. The treatment of CAH in pregnancy is still debatable. We present 22-years-old pregnant female (seventh week of gestation), who is currently under dexamethasone (DEX) since almost seven years for NC-CAH. At presentation, she is normotensive, non-obese, with no signs of hirsutism and Cushing syndrome. Seven days after the first visit, an endocrinologist makes informative talk with the patient and her mother about NC-CAH, pregnancy, and drugsassociated risks. Current Clinical Practice Guideline for CAH treatment suggests the use of protocols approved by Institutional Review Boards at Centers experienced in CAH treatment. In women with CAH who are planning a pregnancy, a close relationship between endocrinologist, reproductive gynaecologist and molecular biologist is of great interest. Prenatal management with DEX is advised in particular circumstances. In remaining, the switch from DEX to other glucocorticoids that do not penetrate placenta is advise

Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization

Cold metallization includes the powder or wire application on the cold surface of components by electric arc, gas, plasma, supersonic, gas-detonation method. It could be applied on all metals except on pure copper, but not on glass and non-metallic materials. Thickness of the layer which is being deposited ranges from 0.05 to 5 mm. Porosity of the layer is 3-15 %. Temperature of the parent material does not exceed 250°C, and therefore it sustains its mechanical properties. Taking into account the above mentioned, for the repair of damaged surfaces of components of turbine and hydromechanical equipment, the methodology of the electric arc technique was developed. At first, research regarding the possibility of application of cold metallization at damaged samples of metal sheets and pipes made of structural steel was carried out, and afterwards the same methodology was performed and confirmed during the repair of damaged surfaces of the flange at the horizontal Kaplan turbine with nominal power of 28 MW (Djerdap 2). Functional role of the flange, made of steel X5CrNi18-10, is to prevent the water from entering the enclosed space of the turbine shaft

Influence of SA procedure welding parameters on mechanical properties spiral welded steel tubes API X60

Izbor čelika, dimenzija i načina proizvodnje zavarenih cevi je deo procesa konstruisanja, jer je u uskoj vezi sa funkcijom cevi kao konstrukcijske celine u određenim uslovima eksploatacije za predviđeni vek trajanja. Kvalitet zavarenih spojeva u procesu proizvodnje cevi definiše se karakteristikama koje one moraju posedovati da bi zadovoljile određene zahteve, što se postiže izborom odgovarajućih postupaka i parametara zavarivanja, sprovođenjem programa kontrole svih tehnoloških operacija u njihovoj izradi i mehaničkim i tehnološkim ispitivanjima otpornosti i deformacije osnovnog materijala i zavarenih spojeva cevi. U radu su prikazani rezultati ispitivanja mehaničkih osobina spiralno zavarenih cevi, za dva proizvodna procesa sa različitim parametrima zavarivanja. Cevi namenjene za naftovode i gasovode su izrađene zavarivanjem pod praškom (EPP) od čelika povećane čvrstoće API X60.The selection of steel, the dimensions and methods of seam welded steel tubes fabrication are closely connected to the function of tube as a whole structure in specific working conditions, for a calculated service life. The quality of welded joints in the fabrication process of seam welded tubes is defined by properties the tubes must possess in order to satisfy defined requirements, and can be achieved by choosing appropriate procedures and welding parameters, by following control programmes in all fabricating operations, and through mechanical and technology stress and strain tests of base metal and seam welded joints. The paper presents the results of the mechanical properties of spiral welded pipes, the two production processes with different welding parameters. Tubes designed for oil and gas pipelines are made by welding the powder (EPP) steel increased strength of API X60

Цитотоксични потенцијал естара линолеинске киселине детектованих у одбрамбеним секретима стонога Megaphyllum bosniense и M. unilineatum (Diplopoda: Julida)

Najveći broj stonoga iz klase Diplopoda poseduje hemijsku zaštitu od predatora i/ili patogenih mikroorganizama, koji podrazumeva prisustvo odbrambenih žlezda (ozadena) na trupu čiji se sekreti izbacuju u spoljašnju sredinu preko otvora koji se naziva ozopora. Predstavnici reda Julida su poznati po tome da su najčešće dominantne komponente njihovih odbrambenih sekreta hinoni. Pored hinona, u sekretima ozadena Julida registrovani su i alkoholi, aldehidi, ketoni, fenolna jedinjenja, kao i brojni estri zasićenih i nezasićenih karboksilnih kiselina. Dosadašnja istraživanja su pokazala da su ekstrakti odbrambenih sekreta Julida, kao i pojedinačna jedinjenja koja u njihov sastav ulaze, biološki aktivni prirodni proizvodi, ali njihov citotoksični potencijal nije dovoljno istražen. U ovoj studiji je ispitivan uticaj različitih estara linoleinske kiseline (butil-, pentil-, heksil-, heptil-, oktil-, nonil-, fenetil- i 3- fenilpropil-linoleat) detektovanih u odbrambenim sekretima stonoga Megaphyllum bosniense i M. unilineatum na vijabilnost normalnih (BEAS-2B) i kancerskih (A549) ćelija pluća korišćenjem MTT testa. Svi ispitivani estri su smanjivali vijabilnost ćelija, pri čemu je postojala značajna razlika u odgovoru kancerskih u odnosu na normalne ćelije u slučaju tri estra (heksil-, fenetil- i 3- fenilpropil-linoleat). Iako su estri karboksilnih kiselina poznati kao malo reaktivna jedinjenja, rezultati ove studije pokazuju da predstavnici ove klase hemijskih jedinjenja mogu imati citotoksični potencijal.Највећи број стонога из класе Diplopoda поседује хемијску заштиту од предатора и/или патогених микроорганизама, који подразумева присуство одбрамбених жлезда (озадена) на трупу чији се секрети избацују у спољашњу средину преко отвора који се назива озопора. Представници реда Julida су познати по томе да су најчешће доминантне компоненте њихових одбрамбених секрета хинони. Поред хинона, у секретима озадена Julida регистровани су и алкохоли, алдехиди, кетони, фенолна једињења, као и бројни естри засићених и незасићених карбоксилних киселина. Досадашња истраживања су показала да су екстракти одбрамбених секрета Julida, као и појединачна једињења која у њихов састав улазе, биолошки активни природни производи, али њихов цитотоксични потенцијал није довољно истражен. У овој студији је испитиван утицај различитих естара линолеинске киселине (бутил-, пентил-, хексил-, хептил-, октил-, нонил-, фенетил- и 3- фенилпропил-линолеат) детектованих у одбрамбеним секретима стонога Megaphyllum bosniense и M. unilineatum на вијабилност нормалних (BEAS-2B) и канцeрских (A549) ћелија плућа коришћењем МТТ теста. Сви испитивани естри су смањивали вијабилност ћелија, при чему је постојала значајна разлика у одговору канцерских у односу на нормалне ћелије у случају три естра (хексил-, фенетил- и 3- фенилпропил-линолеат). Иако су естри карбоксилних киселина познати као мало реактивна једињења, резултати ове студије показују да представници ове класе хемијских једињења могу имати цитотоксични потенцијал.Knjiga sažetaka: Treći Kongres biologa Srbije, Zlatibor, Srbija 21 - 25. 9. 2022

Epidemiological Predictors of Positive SARS-CoV-2 Polymerase Chain Reaction Test in Three Cohorts: Hospitalized Patients, Healthcare Workers, and Military Population, Serbia, 2020

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and its resulting coronavirus disease 2019 (COVID-19) has caused a fast-moving pandemic. Diagnostic testing, aimed to identify patients infected with SARS-CoV-2, plays a key role in controlling the COVID-19 pandemic in different populations. (2) Methods: This retrospective cohort study aimed to investigate predictors associated with positive polymerase chain reaction (PCR) SARS-CoV-2 test results in hospitalized patients, healthcare workers (HCWs), and military personnel (MP) during 2020, before the widespread availability of COVID-19 vaccines. Persons with a positive test result were compared with persons with a negative test result in three cohorts during the study period. (3) Results: A total of 6912 respondents were tested, and 1334 (19.3%) of them had positive PCR SARS-CoV-2 test results. Contact with a known COVID-19 case within 14 days (p < 0.001; OR: 1.48; 95% CI: 1.25–1.76), fever (p < 0.001; OR: 3.66; 95% CI: 3.04–4.41), cough (p < 0.001; OR: 1.91; 95% CI: 1.59–2.30), headache (p = 0.028; OR: 1.24; 95% CI: 1.02–1.50), and myalgia/arthralgia (p < 0.001; OR: 1.99; 95% CI: 1.65–2.42) were independently associated with positive PCR SARS-CoV-2 test results in the cohort of MP. Furthermore, fever (p < 0.001; OR: 2.75; 95% CI: 1.83–4.13), cough (p < 0.001; OR: 2.04; 95% CI: 1.32–3.13), headache (p = 0.008; OR: 1.76; 95% CI: 1.15–2.68), and myalgia/arthralgia (p = 0.039; OR: 1.58; 95% CI: 1.02–2.45) were independently associated with positive PCR SARS-CoV-2 test results in the cohort of HCWs. Moreover, independent predictors of positive PCR SARS-CoV-2 test results in hospitalized patients were contact with a known COVID-19 case within 14 days (p < 0.001; OR: 2.56; 95% CI: 1.71–3.83), fever (p < 0.001; OR: 1.89; 95% CI: 1.38–2.59), pneumonia (p = 0.041; OR: 1.45; 95% CI: 1.01–2.09), and neurological diseases (p = 0.009; OR: 0.375; 95% CI: 0.18–0.78). (4) Conclusions: According to data gathered from cohorts of hospitalized patients, HCWs, and MP, before the widespread availability of COVID-19 vaccines in Serbia, we can conclude that predictors of positive PCR SARS-CoV-2 test results in MP and HCWs were similar. Accurate estimates of COVID-19 in different population groups are important for health authorities

Citotoksični potencijal ekstrakata i odabranih estara iz odbrambenih sekreta vrsta Megahphyllum bosniense i M. unilineatum (Diplopoda: julida) prema ćelijama raka debelog creva

Ciljevi ove studije bili su: 1) ispitivanje citotoksičnog potencijala različitih estara linoleinske kiseline (butil-, pentil-, heksil-, heptil-, oktil-, nonil-, fentil- i 3-fenilpropil- linoleat) detektovanih u odbrambenim sekretima dve vrsta stonoga iz reda Julida - Megaphyllum unillineatum (C. L. Koch, 1838) i M. bosniense (Verrhoeff, 1897) na vijabilnost ćelija raka debelog creva (SW480) i 2) analiza vijabilnost SW480 ćelija nakon tretiranja ekstraktima odbrambenih sekreta pomenutih vrsta