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result(s) for
"Cevik, M"
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Investigation of the effects of some phytochemicals on Yersinia ruckeri and antimicrobial resistance/Investigacao dos efeitos de alguns fitoquimicos em Yersinia ruckeri e resistencia antimicrobiana
In this study, it is aimed to investigate the effects of Moringa oleifera and Sorbus domestica plant extracts on bacterial disease agents Yersinia ruckeri in aquaculture. Morphological and biochemical properties of 2 different Y. ruckeri isolates were determined. Then, Real-Time PCR analysis and gene sequencing of the isolates were identified. Phytochemicals (M. oleifera and S. domestica) and antibiotics (Oxytetracycline (OX) and Enrofloxacin (ENR)) were used together in the antibiogram test of antibiotics compared to the effect status of antibiotics. Also, the effects of phytochemicals on Y. ruckeri growth was examined comparatively by spectrophotometrically measuring at 600 nm wavelength every 2 hours according to bacterial growth densities with 10 different groups formed on TSB medium. As a result of the study, it was observed that the isolates formed Gram negative, catalase positive, oxidase negative, mobile and typical Y. ruckeri colonies. After the biochemical tests performed with Microgen ID panel, 99.85% similarity was determined. The isolates overlap with the 16S rRNA gene region after sequence analysis, and 99% of the isolates were similar in phylogenetic analysis. After the antibiogram test, Oxytetracycline and Enrofloxacin antibiotics were resistant to Y. ruckeri but the effects of phytochemicals were less on solid medium (MHA). As a result of the measurements carried out in liquid medium (TSB), it was observed that phytochemicals such as M. oliefera and S. domestica inhibit the growth of bacteria by 40-50%. As the importance of antibiotic resistance is increasing day by day, we believe that these phytochemicals will give positive results in treatment instead of using antibiotics.
Journal Article
Effects of melatonin implantation on the fertility potentials of Kivircik and Charollais ewes and rams during the non-breeding season
2017
This study examined the effect of melatonin implantation during the non-breeding season on the reproductive performance of ewes and the testicular dimensions of rams. In seasonally anestrus Kivircik and Charollais ewes and rams were subjected to melatonin. Estrus response was significantly higher in treated than control ewes of both breeds (p<0.001). The pregnancy rate was significantly lower (p<0.001) in the control than in the treated animals. The twinning rate was significantly lower in melatonin implanted Kivircik than Charollais ewes (p<0.05). The testicular dimensions after 42 days of melatonin treatment increased in both breeds. Scrotal length (SL) increased in Kivircik and Charollais rams (p<0.01). The increase in scrotal circumference (SC) was more marked in the Charollais (P<0.01) than in the Kivircik rams. There was a large increase in testicular volume (TV) in both Kivircik (p<0.01) and Charollais (p<0.001) rams. This study shows that melatonin implants can be applied to induce estrus in ewes approximately four months earlier than breeding season. Melatonin implantation in the non-breeding season significantly increased testicular dimensions in Kivircik and Charollais rams thus increasing their reproductive potential.
Journal Article
Viral Load as a Predictor of Outcome in Crimean-Congo Hemorrhagic Fever
2007
Crimean-Congo hemorrhagic fever (CCHF) is a potentially fatal disease affecting multiple organ systems. To determine the association between viral load and severity of CCHF infection, quantitative measurement of CCHF virus was performed using 1-step reverse-transcriptase polymerase chain reaction for 36 patients with CCHF infection. Viral loads ranged from 1.1 × 103 copies/mL to ⩾ 9.9 × 109 copies/mL. Nine (25%) of 36 patients died. In 8 of the 9 patients with fatal outcomes, viral loads were detected that were ⩾1 × 109 copies/mL, whereas in 25 of the 26 patients with nonfatal outcomes, viral loads were detected that were <1 × 109 copies/mL (P < .001). A viral load ⩾1 × 109 RNA copies/mL can be considered to predict a fatal outcome with a positive predictive value of 80%, with 88.9% sensitivity and 92.6% specificity. We suggest that viral load is a measure of the severity of CCHF.
Journal Article
OPTIMIZATION OF MICROWAVE-ASSISTED DRYING OF JERUSALEM ARTICHOKES BY RESPONSE SURFACE METHODOLOGY AND GENETIC ALGORITHM
2016
The objective of the present study was to investigate microwave-assisted drying of Jerusalem artichoke tubers to determine the effects of the processing conditions. Drying time (DT) and effective moisture diffusivity (EMD) were determined to evaluate the drying process in terms of dehydration performance, whereas the rehydration ratio (RhR) was considered as a significant quality index. A pretreatment of soaking in a NaCl solution was applied before all trials. The output power of the microwave oven, slice thickness and NaCl concentration of the pretreatment solution were the three investigated parameters. The drying process was accelerated by altering the conditions while obtaining a higher quality product. For optimization of the drying process, response surface methodology (RSM) and genetic algorithms (GA) were used. Model adequacy was evaluated for each corresponding mathematical expression developed for interested responses by RSM. The residual of the model obtained by GA was compared to that of the RSM model. The GA was successful in high-performance prediction and produced results similar to those of RSM. The analysis and results of the present study show that both RSM and GA models can be used in cohesion to gain insight into the bioprocessing system. --Keywords: Jerusalem artichoke, microwave-assisted drying, effective moisture diffusivity, response surface methodology, genetic algorithm--
Journal Article
Effects of subcutaneous melatonin implants and short-term intravaginal progestagen treatments on estrus induction and fertility of Kivircik ewes on seasonal anestrus
2018
The aim of this study was to compare the efficacy of estrus induction and fertility by using subcutaneous melatonin (MEL, T1) and short-term intravaginal medroxyprogesteronacetate plus pregnant mare serum gonadotropin treatments (sMAP+eCG, T2) in ewes on seasonaly anestrus. In this study, 105 mature clinically healthy Kivircik ewes in anestrus season and 4 rams were used. After synchronization applications, ewes exhibiting estrus signs were hand-mated with rams known to be fertile. Blood samples were collected at different times in order to determine progesterone (P4) concentrations. Results showed that estrus manipulation protocols induced significant improvement in pregnancy rate. All the fertility results obtained with the sMAP+eCG or MEL groups were similar, in seasonal anestrus. The efficacy duration of P4 in the MEL group was longer than that in short-term progestagen group. Plasma P4 concentrations was significantly different between the first (I) and last (III) measurement days (p0.01). Increase in P4 concentration in T2 group was faster than that in T1 group, and blood P4 concentrations at higher levels could successfully be achieved by using any of the protocols in this study during the seasonal anestrus. In conclusion, according to the results obtained, the hormone application groups received very high estrus response. In addition, the twin ratio was found to be higher in T1 group compared to those determined in the other groups (T2 and Control group). Furthermore, plasma P4 concentrations and high birth rates were obtained in ewes in T1 and T2 groups. These procedures can be considered a good alternative to traditional procedures due to its flexibility under field conditions.
Journal Article
1559 Button Battery Injuries Lodged in the Esophagus, the Evolving Danger
2012
Background and Aim Button battery (BB) ingestion is potentially a life-threatening condition for children and has increased continuously in recent years. BBs lodged in the esophagus may cause serious complications and even death. The aim of the present study was to compare the relevant studies in the literature to our results of cases in which a BB was lodged in the esophagus. Methods The present study retrospectively analyzed 16 patients who ingested BBs that lodged in the esophagus. Data were collected from medical charts at the pediatric surgery department during 2007–2011. Ten male (62.5%) and six female patients aged 2–99 months (mean age ± SD, 34.81±25.23 months) were evaluated. Cases were studied for time and location of the battery in the esophagus, presenting symptoms, diagnostic evaluation, complications, and outcomes. Results Children who ingested BBs were all < 6 years of age (14) (87.4%). The most common clinical complaint of the patients was history of swallowing and diysphagia. Eight patients suffered from corrosion at different stages, 2 had an eosophageal perforation and tracheoesophageal fistula. Two patients were death releated complication of BB ingestion. Nine (56.3%) patients had BB ingestion history before admission to the clinic. All BBs were from toys and were lithium BBs of >15 mm circumference. Conclusions BB ingestion is an important condition in children. An endoscopic examination and removal must be performed urgently for a BB lodged in the esophagus.
Journal Article
The role of the UTS2 gene polymorphisms and plasma Urotensin-II levels in breast cancer
by
Kalender, M. Emin
,
Arslan, Ahmet
,
Bagis, Haydar
in
Adult
,
Biomedical and Life Sciences
,
Biomedicine
2015
Breast cancer is the most common malignancy predominantly affecting women. To date, numerous numbers of studies were reported novel genetic contributors with diagnostic, prognostic, and therapeutic potential for the breast carcinogenesis. However, the role of urotensin-II in breast carcinogenesis has not been elucidated yet. Urotensin-II is a somatostatin-like cyclic tiny peptide identified by its potent vasoconstrictor activity. Soon after its discovery, its involvement in many disease states as well as its expression in various tissues including the tumors have been demonstrated. Moreover, there is strong evidence that suggest urotensin-II as the significant contributor of angiogenesis as well as cell proliferation and tumor biology. In this study, enzyme-linked immunosorbent assay (ELISA) and restriction fragment length polymorphism analysis were used to evaluate plasma levels of urotensin-II and Thr21Met and Ser89Asn polymorphisms of
UTS2
gene in breast cancer patients. In the present case-control study, we noticed a significant decrease in the levels of urotensin-II protein in the plasma of the breast cancer patients (
p
< 0.05). Also, Thr21Met polymorphism in the
UTS2
gene was associated with the risk of developing breast cancer (
p
< 0.0001), whereas the genotype frequency of Ser89Asn was found to be similar in patients and controls (
p
> 0.05). In addition, we demonstrated the gradual decreasing of urotensin-II protein levels from TT and TM to MM genotypes. In conclusion, these results strongly suggest that urotensin-II could contribute to breast carcinogenesis and Thr21Met polymorphism can be an important risk factor in developing breast tumors.
Journal Article
Evaluation of antioxidative/oxidative status and prolidase parameters in cases of inguinal hernia with joint hypermobility syndrome
2014
Purpose
Most previous reports have shown that the basic mechanism of inguinal hernia involves insufficient collagen strength and metabolism. The aim of this study was to evaluate whether joint hypermobility is involved in the development of inguinal hernia in children and to investigate oxidative stress parameters and prolidase activity in tissue samples from children with inguinal hernia.
Methods
This cross-sectional study involving 41 patients (age, 6.36 ± 2.96 years) with inguinal hernia treated in the pediatric surgery department of our institution and 40 age- and sex-matched controls (age, 6.02 ± 3.13 years) was performed from May to December 2011. Joint hypermobility was assessed using the Beighton criteria in all patients. Hernia sacs were analyzed with respect to the total antioxidative/oxidative status and prolidase activity. The patients were divided into two groups (inguinal hernia with and without hypermobility) according to a Beighton score cut-off of ≥6.
Results
A total of 81 subjects aged 3–10 years participated. The ratio of joint hypermobility was significantly higher in patients than in controls (
p
= 0.01). The prolidase activity, total oxidant status, and oxidative stress index were higher in tissue samples from patients with joint hypermobility (
p
< 0.001).
Conclusions
Our results show that joint hypermobility syndrome is associated with inguinal hernia in children and that increased prolidase activity and oxidative stress in tissue samples from patients with joint hypermobility syndrome are related to collagen tissue damage and turnover.
Journal Article
Potentials of Crankshaft Fillet Rolling Process
by
Cevik, M. Cagri
,
Hochbein, Helmut
,
Rebbert, Martin
in
Cast iron
,
Compressive properties
,
Compressive stress
2012
Crankshaft is a dynamic component that copes with elevated alternating stresses. In order to ensure the service reliability, fillet rolling process is being applied. The state of the art empirical assumptions to consider the effect of fillet rolling process on crankshaft fatigue are conservative. This leads to an over-engineering of the crankshaft. However, calculation of the compressive residual stresses due to surface treatment is a demanding task. The quality of the durability analysis can only be increased by an accurate consideration of the fillet rolling effect. Therefore, Hegenscheidt-MFD, FEV Motorentechnik and Institute for Combustion Engines (VKA) cooperated to enlighten the phenomenon of the fillet rolling process. Process calculations are applied and validated by the measurements and tests. The calculated residual stresses are then superposed with the dynamic loads calculated by FEV Virtual Engine. The calculations are applied based on a state of the art inline four cylinder gasoline engine. The results show that there is an increase in safety factors even more than a factor of 2.5, in case of spheroidal cast iron.
Journal Article