Türkiye’de sığırlarda kış dizanterisinde ilk lokal coranavirusun izalasyonu

Winter dysentery (WD) is a very contagious disease of cattle characterized by profuse diarrhea. The precise etiology of disease is still not fully elucidated. Aim of the presented study was investigation of the causative agents of disease in a herd affected by WD and to evaluate routine haematological and biochemical parameters of cows with WD. This study was carried out on blood and fecal samples collected from 12 cows showing typical signs of disease during an outbreak of WD in Bursa, Turkey. Samples were analysed for the presence of bovine coronavirus (BCoV), Bovine viral diarrhea (BVD), Eimeria oocysts and Campylobacter spp. using ELISA, RT-PCR, flotation technique and culture. Faecal samples were inoculated in HRT cell cultures for virus isolation. Isolated viruses were identified as coronaviruses from 25% of the samples by ELISA, PCR and serum neutralisation tests. Campylobacter spp. was isolated from 33.3% cows with dysentery. BVD and Eimeria oocysts were not detected in any of the samples. Results of the presented study indicates that BcoV along with Compylobacter spp. may be the primary agent of WD in cows. However negative results for BCoV and Campylobacter spp of 58 % of feacal samples indicates that etiology of the disease is still not fully elucidated and pathogens other than BCoV and Campylobacter could also be involved in pathogenesis of the diseaseKış dizanterisi sulu ishal ile karakterize sığırların çok bulaşıcı bir hastalığıdır. Hastalığın etiyolojisi hala tam olarak aydınlatılamamıştır. Sunulan çalışmanın amacı kış dizanterisi ile enfekte olan sürüde etiyolojik ajanların, rutin hematolojik ve biyokimyasal parametrelerin araştırılmasıdır. Çalışmada Bursa bölgesinde tipik kış dizanterisi bulguları gösteren 12 sığırdan kan ve dışkı örnekleri toplanmıştır. Örnekler, bovine coronavirus (BCoV), bovine viral diarrhea (BVD), Eimeria ookistleri ve Campylobacter spp. yönünden ELISA, RT-PCR, kültür ve flotasyon tekniği ile analiz edilmiştir. Dışkı örneklerinde, virus izolasyonu için HRT hücre kültürü yapılmıştır. Örneklerin%25’inden ELISA, PCR ve serum nötralizasyon yöntemi ile coronavirus identifiye edilmiştir. Dizanterili sığırların %33,3’ünden Campylobacter spp. izole edilmiştir. Hiçbir örnekte BVD ve Eimeria ookistlerine rastlanılmamıştır. Sunulan çalışmanın sonuçları göstermektedir ki Campylobacter spp ile birlikte BcoV sığırlarda kış dizanterisinin primer etkeni olabilir. Ancak dışkı örneklerinin % 58’i BCoV ve Campylobacter spp yönünden negatiftir ve hastalığın etiyolojisi hala tam olarak aydınlatılamadığı için BCoV ve Campylobacter spp dışında başka pathojenlerde hastalığın pathogenezinde rol olabilir

Segment 10 based molecular epidemiology of bluetongue virus (BTV) isolates from Turkey: 1999-2001

Bluetongue is a significant arbovirus infection that has a negative impact on ruminant productivity in Turkey. Twenty-one Turkish BTV isolates were analyzed phylogenetically, based on genome segment 10 (Seg-10) nucleotide sequences. These analyses were used to explore the epidemiological background of individual isolates from both a regional and global perspective. In the regional analysis, the different BTV strains fell into two groups (Group 1 and Group 2). The Turkish virus isolates were localized in Group 1 which contains two sub-groups. The neighbor-joining analysis revealed that Seg-10 of majority of the Turkish viruses was closely related to certain other virus strains allocated in the eastern lineage. The Seg-10's of two viruses (TR25 and TR26) were more closely related to strains isolated in the Asia-Australia region. These strains belong to the 'eastern' topotype identified by [Maan, S., Maan, N.S., Ross-Smith, N., Batten, C.A., Shaw, A.E., Anthony, S.J., Samuel, A.R., Darpel, K.E., Veronesi, E., Oura, C.A.L., Singh,K.P., Nomikou, K., Potgieter, A.C., Attoui, H., van Rooij, E., van Rijn, P., De Clercq, K., Vandenbussche, F., Zientara, S., Bréard, E., Sailleau, C., Beer, M., Hoffman, B., Mellor, P.S., Mertens, P.P.C., 2008. Sequence analysis of bluetongue virus serotype 8 from the Netherlands 2006 and comparison to other European strains. Virology 377, 308-318]. Comparisons of amino acid sequences deduced from the Seg-10 genes showed a high level of conservation in the NS3/3A proteins from the Turkish viruses. The more frequent amino acid substitutions were identified by multiple alignment analysis, and one of the isolates (TR23) was remarkably found to be genetically quite distinct from the other isolates.TÜBİTAK Project No.: 105O24

Eco-Geopolymers: Physico-Mechanical Features, Radiation Absorption Properties, and Mathematical Model

Waste ashes and radiation are hazardous environmental and health factors; thus, a lot of attention is paid to their reduction. We present eco-geopolymer building materials (GPBMs) based on the class F fly ashes (FFAs) from thermal power plants (TPPs) and their implementation as a barrier against radioactive radiation. Different methods of production, ratios of FFA to alkali activator, and temperatures of curing were tested. Small spherical particles and higher content of SiO2 resulted in developed surface area and higher reactivity of Isken TPP FFA than Catalagzi TPP FFA. Lower activator concentration (10% vs. 20%) and curing temperature (70 vs. 100 °C) caused an increase in GPBM compressive strength; the highest value was measured as 93.3 MPa. The highest RA was measured for GPBMs, provided alkali activator ratio (Na2SiO3/NaOH) was >2 and its concentration was 20%. The mathematical model developed in this study proved FFA quantity, and thus GPBM mechanical properties, as key factors influencing RA. In the light of these results, the lightweight GPBMs can be excellent materials for the construction sector dedicated to immobilization, storage, and disposal for radionuclides or barriers against radiation; however, multiple steps of their production require careful optimization