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Post-Processing Effects on Surface Properties of Direct Metal Laser Sintered AlSi10Mg Parts
Binnur Sagbas 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1
Direct metal laser sintering is a powder bed fusion type additive manufacturing (AM) method. It provides opportunity tocreate near net shape parts layer-by-layer. Because of poor surface quality post processing operations are required. Thispaper investigates the effect of surface finishing operations such as abrasive blasting, shot peening and polishing on surfacetexture properties and green tribological behavior of direct metal laser sintered AlSi10Mg parts. 2D and 3D surface roughnesscharacterization, density and hardness measurements were implemented. Ball-on-disc wear tests were applied under10 N load with palm oil and soybean oil as green lubricants. Petrol based, commercial machine oil was used for control. Theresults revealed that post processing operations affected surface texture and tribological properties of the samples. Abrasiveblasting increased surface hardness to the 187 HV, while it was measured as 178 HV and 124 HV for shot peening and polishingprocesses respectively. Average surface roughness Ra, was measured as 18.71 μm for shot blasted surface. This valuerecorded as 5.39 μm for shot peened and 1.39 μm for polished surfaces. Minimum wear rate was calculated as 3.88 × 10−4mm3/Nm for shot peened surface with palm oil while maximum was calculated as 7.92 × 10−4 mm3/Nm for polished surfacewith MO lubrication. Palm oil and soybean oil represented superior lubricating properties than petrol based commercialmachine oil for all surfaces. It can be concluded that surface post processing has important effect on texture properties ofmetal AM parts. Moreover, vegetable oils are promising lubricants for increasing tribological properties of AM surfaces.
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Alagozlu, Hakan,Ozdemir, Ozturk,Koksal, Binnur,Yilmaz, Abdulkerim,Coskun, Mahmut Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
In the current study we aimed to show the common YMDD motif mutations in viral polymerase gene in chronic hepatitis B patients during lamivudine and adefovir therapy. Forty-one serum samples obtained from chronic hepatitis B patients (24 male, 17 female; age range: 34-68 years) were included in the study. HBV-DNA was extracted from the peripheral blood of the patients using an extraction kit (Invisorb, Instant Spin DNA/RNA Virus Mini Kit, Germany). A line probe assay and direct sequencing analyses (INNO-LIPA HBV DR v2; INNOGENETICS N.V, Ghent, Belgium) were applied to determine target mutations of the viral polymerase gene in positive HBV-DNA samples. A total of 41 mutations located in 21 different codons were detected in the current results. In 17 (41.5%) patients various point mutations were detected leading to lamivudin, adefovir and/or combined drug resistance. Wild polymerase gene profiles were detected in 24 (58.5%) HBV positive patients of the current cohort. Eight of the 17 samples (19.5%) having rtM204V/I/A missense transition and/or transversion point mutations and resistance to lamivudin. Six of the the mutated samples (14.6%) having rtL180M missense transversion mutation and resistance to combined adefovir and lamivudin. Three of the mutated samples (7.5%) having rtG215H by the double base substituation and resistance to adefovir. Three of the mutated samples (7.5%) having codon rtL181W due to the missense transversion point mutations and showed resistance to combined adefovir and lamivudin. Unreported novel point mutations were detected in the different codons of polymerase gene region in the current HBV positive cohort fromTurkish population. The current results provide evidence that rtL180M and rtM204V/I/A mutations of HBV-DNA may be associated with a poor antiviral response and HBV chronicity during conventional therapy in Turkish patients.
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Durability of Sustained Virologic Response in Chronic Hepatitis C
( Ahmet Uyanikoglu ),( Sabahattin Kaymakoglu ),( Ahmet Danalioglu ),( Filiz Akyuz ),( Fatih Ermis ),( Binnur Pinarbasi ),( Kadir Demir ),( Fatih Besisik ),( Yilmaz Cakaloglu ) 대한소화기학회 2013 Gut and Liver Vol.7 No.4
Background/Aims: The aim of this study is to investigate the rate of sustained virologic response (SVR) in chronic hepatitis C patients receiving antiviral treatment. Methods: The files of patients with chronic hepatitis C treated with interferon±ribavirin between 1995 and 2009 were reviewed retrospectively. Six months after the end of treatment, patients with negative hepatitis C virus (HCV)-RNA (<50 IU/mL, as determined by the polymerase chain reaction method) were enrolled in the study. Results: The mean age of 196 patients (89 males) was 46.13±11.10 years (range, 17 to 73 years). In biopsies, the mean stage was 1.50±0.94; histological activity index was 7.18±2.43. In total, 139 patients received pegylated interferon (IFN) +ribavirin, 21 patients received classical IFN+ribavirin, and 36 patients received IFN alone. The HCV genotypes of 138 patients were checked: 77.5% were genotype 1b, and 22.5% were other genotypes. After achievement of SVR, the median follow-up period was 33.5 months (range, 6 to 112 months), and in this period relapse was only detected in two patients (1.02%) at 18 and 48 months after treatment. Conclusions: In total, 98.9% of patients with SVR in chronic hepatitis C demonstrated truly durable responses over the long-term follow-up period of 3 years; relapsed patients had intermittent or low-grade viremia. (Gut Liver 2013; 7:458-461)
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Chemopreventive Effects of Hydatid Disease on Experimental Breast Cancer
Altun, Ahmet,Saraydin, Serpil Unver,Soylu, Sinan,Inan, Deniz Sahin,Yasti, Cinar,Ozdenkaya, Yasar,Koksal, Binnur,Duger, Cevdet,Isbir, Cemil,Turan, Mustafa Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.4
Breast cancer is one of the most common and letal cancers in all over the world. Since there have been significant improvements in treatment of breast cancer, there is still a big need for alternative approaches. In this study, we aimed to investigate protective role of hydatid disease against breast cancer. Twenty Wistar rats were divided into two groups of 10 rats each Group I (control) and Group II. In Group II intraperitoneal hydatidosis was performed. Then DMBA was applied to mammary tissues of all rats. Immunohistochemistry studies for Ki-67 and S-100 in the tumoral tissue sections of DMBA induced mammary tumor in rats were performed. TUNEL Assay was used to detect apoptotic cells of tumoral tissue. In vivo anticancer activity testing was carried out by preventing the tumorigenesis by DMBA in mammary tissue of rats. The expressions of the Ki-67 and S-100 protein decreased in rats who had Hydatid Disease (HD) (Group II), compared with the control rats (Group I). TUNEL positive cells were higher in rats with HD (Group II), compared with the control rats (Group I). In vivo studies showed that HD prevented the tumorigenesis by DMBA in mammary tissue of rats with 50 percent.In the light of the evidence the present study showed that HD may have chemopreventive effects on DMBA induced breast cancer.
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