230 research outputs found
Role of Mg doping in the structural, optical, and electrical characteristics of ZnO-based DSSCs
ZnO- and Mg-doped ZnO samples are prepared by spray pyrolysis on conducting glass substrates to fabricate ZnO-based dye-sensitized solar cells (DSSCs). In uences of Mg-doping content on the power conversion efficiencies of ZnO-based DSSCs are investigated. X-ray diffraction results show that all the samples exhibit a hexagonal wurtzite structure. Scanning electron microscopy data indicate that the ZnO sample has uniform rods with 1 ? m diameter. With respect to ZnO, the band gap value of 4 at.% Mg-doped ZnO samples improves to the value of 3.27 eV and a further increase in Mg level up to 6 at.% gives rise to a decline in the band gap value of 3.22 eV. Photoluminescence measurements illustrate that intensities of the ultraviolet peak and a red luminescence peak take their maximum values for 4 at.% Mg doping. From solar cell performance measurements, the best power conversion efficiency of 0.08% is obtained for the doping amount of 4 at.% Mg
INHERITED THROMBOPHILIA IN TURKISH WOMEN, AS A RISK FACTOR FOR ISCHEMIC PLACENTAL DISEASES
We aim to elucidate the link between inherited thrombophilias andpregnancies complicated with ischemic placental diseases, in Turkishwomen. This is a case control study comprising 140 women with ischemicplacental disease and 60 uncomplicated pregnant women. Parametersincluding haemoglobin, platelet count, uric acid, vitamin B12, folic acid,copper, homocysteine, plasminogen activator inhibitor-1, fibrinogen, proteinS, protein C, activated protein C resistance values were significantly changedin women with ischemic placental disease when compared to those withnormal pregnancies.The association between thrombophilia and ischemic pregnancy diseases isstronger than suggested previously. Furthermore, copper is selectivelyelevated in complicated pregnancies
Yüzey modifikasyonu yardımıyla CdS toz bazlı hibrit güneş pillerinde performans artışı
The effects of surface modification of CdS through organic Eosin-Y, indoline D205, and Ru-based complex N719 and
N3 dyes on CdS-based hybrid solar cells were studied. Chemical bath deposition (CBD) and doctor blade methods were
in turn employed to fabricate the CdS specimens on Indium-Tin Oxide (ITO) covered glass substrates. P3HT material
with and without dye coatings was covered through a spin-coater on the surface of CdS specimens. Ag paste was then
deposited on the surface of P3HT to obtain hybrid solar cells. Structural analysis indicated that CdS powders showed a
cubic growth with the preferred orientation of (111). Morphological analysis demonstrated that CdS powders exhibited
hierarchical morphology and the morphology turned to granular structure with some porosity upon deposition of both N3
dye and P3HT layers. Absorption plots indicated that Eosin-Y dye loading led to a rise in the absorbance values of CdS
specimens. After dye loading, photoluminescence data of CdS-based heterostructure illustrated a decrement in the
luminescence intensity, implying that effective exciton dissociation was obtained. Current density-voltage (J-V)
characteristics of the hybrid solar cells depicted that the best overall efficiency was observed for Eosin-Y-modified cell
as 0.135%. This proved that surface modification by Eosin-Y dye led to a better interfacial contact between CdS and
P3HT bilayer due to the enhancement in the charge separation.CdS-tabanlı hibrit güneş pillerinde, CdS'nin yüzey modifikasyon etkileri organik Eosin-Y, indolin D205 ve Ru bazlı N719
ve N3 boyaları vasıtasıyla incelendi. CdS örneklerini İndiyum-Kalay Oksit (ITO) kaplı cam altlıklar üzerinde büyütmek
için, sırasıyla kimyasal banyo çökeltme (CBD) ve doktor bıçak yöntemleri kullanıldı. Boya kaplamaları olan ve olmayan
CdS örneklerinin yüzeyine P3HT materyali, spin kaplama (spin-coater) cihazı yardımıyla kaplandı. Devamında Ag pasta,
hibrit güneş pillerini tamamlamak için P3HT yüzeyine çökeltildi. Yapısal analiz, CdS tozlarının kübik yapıda ve (111)
tercihli yönelime sahip olduğunu gösterdi. Morfolojik analiz, CdS tozlarının hiyerarşik morfolojide olduğunu ve
morfolojinin hem N3 boyası hem de P3HT tabakasının çökeltilmesiyle birlikte taneli ve gözenekli yapıya döndüğünü
gösterdi. Soğurma (absorbsiyon) grafikleri, Eosin-Y boya kaplamasının CdS örneklerinin soğurma değerinde bir artışa
yol açtığını gösterdi. Boya kaplamasının, CdS tabanlı heteroyapının fotolüminesans şiddetinde azalma oluşturması, etkin
bir eksiton ayrışması elde edildiğini ortaya koymaktadır. Hibrit güneş pillerinin akım yoğunluğu-voltaj (J-V)
karakteristiklerinden, Eosin-Y modifikasyonlu güneş pilinin veriminin % 0,135 olarak en yüksek değerde olduğu tespit
edildi. Bu durum, Eosin-Y boyası ile yapılan yüzey modifikasyonunun, yük ayrışmasında oluşturduğu iyileşmeden dolayı,
CdS ve P3HT ikili yapısının arasında daha iyi bir ara yüzey teması sağladığını ispatlamaktadır
Hepatit B virüsüne karşı aşılamada uzun süreli korunma için booster doz gerekliliğinin (in vivo ve in vitro) araştırılması
Aim: Studies have shown that no booster dose was required at least 10 to 15 years after a primary vaccination for individuals who developed protective anti-hepatitis B surface (anti-HBs) antibodies. In this study, booster dose requirement for HBV after primary immunization was investigated. Materials and Methods: Seventeen individuals vaccinated previously were enrolled in the study. They had once developed a protective level of anti-HBs antibody after immunization and their anti-HBs titer had declined to an underprotective level. Twenty uninfected and unvaccinated healthy people were chosen as controls. Lymphoproliferative response to in-vitro stimulation with hepatitis B surface antigen (HBsAg) and anti-HBs response to vaccine were evaluated for immune response. Results: T lymphocytes from 4 (24%) of the study group showed lymphoproliferative response to HBsAg stimulation while none of the controls did (P < 0.05). In all subjects in the study group, anti-HBs response (?10 mIU/ml) was detected 1 to 7 days after the booster injection but in only 2 of the controls antibody response was detected 28 days after the first dose of HBV vaccine (P < 0.0001). Conclusions: A booster dose of HBV vaccine might not be required because of immunological memory.Aim: Studies have shown that no booster dose was required at least 10 to 15 years after a primary vaccination for individuals who developed protective anti-hepatitis B surface (anti-HBs) antibodies. In this study, booster dose requirement for HBV after primary immunization was investigated. Materials and Methods: Seventeen individuals vaccinated previously were enrolled in the study. They had once developed a protective level of anti-HBs antibody after immunization and their anti-HBs titer had declined to an underprotective level. Twenty uninfected and unvaccinated healthy people were chosen as controls. Lymphoproliferative response to in-vitro stimulation with hepatitis B surface antigen (HBsAg) and anti-HBs response to vaccine were evaluated for immune response. Results: T lymphocytes from 4 (24%) of the study group showed lymphoproliferative response to HBsAg stimulation while none of the controls did (P < 0.05). In all subjects in the study group, anti-HBs response (&#8805;10 mIU/ml) was detected 1 to 7 days after the booster injection but in only 2 of the controls antibody response was detected 28 days after the first dose of HBV vaccine (P < 0.0001). Conclusions: A booster dose of HBV vaccine might not be required because of immunological memory
Betonarme çerçeve yapısal sistemlerin özel geometrili ve yüksek dayanımlı beton bloklar ile güçlendirilmesi
TÜBİTAK MAG Proje01.10.200
Evaluation of Nasal Mucociliary Transport Rate by99mTc-Macroaggregated Albumin Rhinoscintigraphy in Woodworkers
Woodworkers in the furniture industry are exposed to wood dust in their workplaces. The aim of this study is to investigate the effect of occupational wood dust exposure on the nasal mucociliary transport rates (NMTRs) in woodworkers. Twenty five woodworkers and 30 healthy controls were included in this study. Wood dust concentration in workplaces was measured using the sampling device. 99m
Tc-macroaggregated albumin (99mTc-MAA) rhinoscintigraphy was performed, and NMTR was calculated in all cases. In statistical analysis, an independent samples t-test was used to compare NMTR of woodworkers and control subjects. We found that the mean NMTR of the woodworkers was lower than that of the healthy controls. However, there was not a statistically significant difference between them (P = 0.066). In conclusion, our findings suggested that wood dust exposure may not impair nasal mucociliary transport rate in woodworkers employed in joinery workshops
Evaluation of preoperative model surgery and the use of a maxillary sinus surgical template in sinus floor augmentation surgery
Maxillary sinus augmentation is an accepted technique
for dental implant placement in presence of insufficient maxillary
bone. There are various techniques in the literature, either by crestal
or lateral approach in maxillary sinus augmentation that have high
percentage of success, while all have complications. Schneiderian
membrane perforation is the most common complication encountered
during surgery. The aim of this study was to evaluate the
benefits of preoperative model surgery and the ease of use of a
maxillary sinus surgical template (MSST) during maxillary sinus
augmentation surgery with a lateral approach. Ten patients included
in the study needed rehabilitation of a partially or totally edentulous
maxilla with an implant-supported fixed prosthesis and requiring
sinus augmentation. A questionnaire was asked to performing surgeons,
and study results showed the use of an MSSTwas found to be
effective in terms of adaptation (62.5%), window preparation
(87.5%), ease of elevation (95.9%), ease of grafting (95.9%), reduction
of perforation risk (91.7%), and achieving immobility during
the procedure (62.5%); however, the use of an MSST was also
found to prolong the surgical procedure (100%) and restrict the view
of the surgical area (79.2%). Maxillary sinus augmentation appears
to be a useful tool for locating an appropriate entrance to the sinus
cavity, allowing for safe elevation of the sinus membrane and effectively
grafting the sinus floor
Thyroid fine needle aspiration reporting rates and outcomes before and after Bethesda implementation: A single-center experience over 8 years
Aimː To evaluate data from our hospital system before and after the implementation of the Bethesda System for Reporting Thyroid Cytology (TBSRTC) and comparison of our data with the previously published studies.
Methods: Seven hundred seventy-one patients with thyroid nodules who underwent fine needle aspiration biopsy (FNAB) and surgery at our institution were analyzed retrospectively. FNAB results were divided into two parts in terms of the period they related to: pre-TBSRTC (between 2005 and 2010) and TBSRTC (between 2011 and 2013).
Results: 341 FNAB were applied in the period of TBSRTC. Of the 341 FNAB, 53(16%) were non diagnostic, 82(24%) were benign, 62(18%) were atypia of undetermined significance or follicular lesion of undetermined significance (AUS/FLUS), 28(8%) were follicular neoplasms and/or suspicion of follicular neoplasms (FN/SFN), 95(28%) were suspicion for malignancy (SuspM), and 21(6%) were malignant. Rates of malignancy reported on follow-up histopathological examination were non diagnostic in 11%, benign in 4.9%, AUS/FLUS in 23%, FN/SFN in 32%, SuspM in 44%, and malignant in 95.3%.
Conclusions: In this study, the distribution of cases in TBSRTC categories and malignancy rates, differed from, recommended by TBSRTC and some studies. Implementation of TBSRTC did significantly affect our institution’s reporting rates
Treatment cost of metastatic colon cancer in Turkey
OBJECTIVES: Colon cancer is the third most common in the top cancer incidence list in Europe. In Europe 212,000 patients die every year due to colon cancer. In Turkey 120,000-130,000 new cancer patients are diagnosed every year, 7.1% of whom are diagnosed to have developed colon cancer. Metastases will occur in up to 50% of the patients who are newly diagnosed. Survival appears to be further prolonged to more than 20 months with new pharmaceuticals; however, these new pharmaceuticals increase the total cost of care. The aim of this study is to estimate the cost implications of new colon cancer treatment options for Turkey.METHODS: Gazi University Hospital treatment protocols for colon cancer treatment were used. Cost of FUFA (5 FU/LV), FOLFIRI, FOLFOX, bevacizumab/FUFA, bevacizumab/FOLFIRI, bevacizumab/FOLFOX, irinotecan and irinotecan/cetixumab protocols were calculated. The cost of combination of protocols were calculated depending on a Markov analysis. The exchange rate was US 5,359). It was followed by FOLFIRI then FOLFOX and FOLFOX, US 16,553, respectively. The lowest cost for each week of life expectancy was established by FUVA with US$ 98.CONCLUSIONS: Only FUFA, FOLFIRI followed by FOLFIX, FOLFIRI/bevacizumab then FOLFOX then cetuximab, FOLFOX/bevacizumab then irinotecan then cetuximab/irinotecan and FOLFIRI/bevacizumab then FOLFOX then cetuximab/irinotecan were under the cost effectiveness curve. In addition no treatments ICER was under the WHO`s threshold for Turkey, except FOLFIRI then FOLFOX compared with FUVA
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