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Erişime Açık

Tribological and thermal characteristics of copper-free brake friction composites

BANU SUGÖZÜ | İLKER SUGÖZÜ

The effects of zinc, steel, aluminum, and brass materials that can be used instead of copper in brake friction composites on braking performance were investigated in this study. The specimens containing three different ratios of metallic shavings were produced by the dry mixing method. In terms of comparison, a total of 16 specimens were examined by producing the specimen containing copper at the same rates and the specimen containing no metallic chip. The weight loss, specific wear rate, and friction coefficient of the specimens were determined by the brake test results. The hardness and dens ...Daha fazlası

Makale 2024 Materials Testing66 ( 2 ) , pp. 2 - 232 0 Görüntülenme
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Tribological properties of brake friction materials containing fly ash

BANU SUGÖZÜ

Purpose The purpose of this study is to investigate the potential of fly ash in automotive brake lining materials. Design/methodology/approach Three brake linings containing fly ash (36, 41 and 46 Wt.%) were designed and produced by dry-mixing, pre-forming and hot pressing. The surface hardness of all brake lining samples was measured by using Brinell hardness tester. The density of the specimens was determined based on Archimedean principle in water. The friction and wear characteristics of the brake lining samples were determined using a real brake disc-type tester. Detailed examinations on ...Daha fazlası

Makale 2018 Industrial Lubrication and Tribology70 ( 5 ) , pp. 9 - 906 1 Görüntülenme
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Association between Cathechol-O-Metyltransferase polymorphism and psoriasis

MEHMET EMİN ERDAL | ÜMİT TÜRSEN | TAMER İRFAN KAYA | EMİNE ARZU KANIK | EBRU DERİCİ EKER | GÜLİZ İKİZOĞLU

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Makale 2004 International Journal of Dermatology43 ( - ) , pp. 3 - 315 0 Görüntülenme
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Significance of catechol-O-methyltransferase gene polymorphism in myofacial pain syndrome

MEHMET EMİN ERDAL

The objective was to investigate possible association of the catechol o-methyl transferase (COMT) gene polymorphisms with myofacial pain syndrome (MFPS). The polymorphism of the COMT gene was compared between 49 patients with MFPS and 113 control subjects. Relationship between COMT polymorphism and psychiatric status of the patients was also assessed using SCL-90-R, BDS, and STAI-I and II tests. A PCR-based restriction fragment length polymorphismassay was used to detect G ! A transition at position 1947 in COMT. There was no relationship between MFPS and COMT polymorphism (p > 0:05). The pati ...Daha fazlası

Makale 2003 The Pain Clinic15 ( 3 ) , pp. 3 - 313 0 Görüntülenme
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Production of boric acid added brake friction composite and the effect of heat treatment on braking characterization

İLKER SUGÖZÜ | BANU SUGÖZÜ

Purpose The purpose of this study was to investigate the use of boric acid as a friction modifier material in brake friction composites and to determine the effect of heat treatment applied during production on braking performance. Design/methodology/approach The addition of five different amounts of boric acid was balanced with cashew, which is in the friction modifier material group. The samples were produced in the following order: dry mixing, preforming and hot-pressing. The effect of the heat treatment that can be applied after the hot-pressing process on the braking performance was inves ...Daha fazlası

Makale 2022 Industrial Lubrication and Tribology74 ( 10 ) , pp. 1 - 1139 0 Görüntülenme
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Role of antioxidant defense system and biochemical adaptation on stress tolerance of high mountain and steppe plants

YÜKSEL KELEŞ

Eleven species were collected from Northwest Anatolian mountains (1500–2000 m) and 18 species were collected from the Central Anatolian steppes (850–1000 m) in June 1998 and 1999. In all the species investigated, the water and dry matter percentages and solute contents were measured. The chlorophyll, b-carotene, ascorbate and a-tocopherol contents and catalase (CAT), superoxide dismutase (SOD) and glutathione reductase (GR) enzyme activities of the plants were also determined. The steppe plants had lower water content compared with alpine plants. The chlorophyll contents of the plants investig ...Daha fazlası

Makale 2004 Acta Oecologica2004 ( 26 ) , pp. 2 - 218 1 Görüntülenme
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Relationship between boron content and antioxidant compounds in Citrus leaves taken from fields with different water source

YÜKSEL KELEŞ

Boron contamination in the agricultural lands is an important problem for Western Turkey, which has rich boron deposits. This study was carried out in Nazilli regions upon orange (Citrus sinensis L. Osbeck) plants irrigated with relatively high boron laden channel waters (LCI) and with well waters (LWI) which contain lower amounts of boron. The leaves of the plants irrigated with channel water were found to contain twice the amount of boron compared with those irrigated with well waters. Boron content of leaves in both groups were approximately ten times the boron content in the soil on which ...Daha fazlası

Makale 2004 Plant And Soil2004 ( 265 ) , pp. 3 - 353 1 Görüntülenme
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Niğde İlinde Yaş Gruplarına Göre Hepatit A, B ve C Seroprevalansı

TUĞÇE ŞİMŞEK BOZOK | TAYLAN BOZOK

Giriş: Viral hepatitler insan sağlığını tehdit eden, morbidite ve mortalitesi yüksek olan önemli bir sağlık sorunudur. Bu çalışmada Niğde ilinde yaş gruplarına ve cinsiyete göre hepatit A, B ve C seroprevalansının araştırılması ve karşılaştırılması amaçlandı. Materyal ve Metod: Çalışmamıza Kasım 2016-Kasım 2019 tarihleri arasında Niğde Eğitim ve Araştırma Hastanesi’nde çeşitli nedenlerle hepatit markerları çalışılan hastalar dahil edildi. Sonuçlar retrospektif olarak analiz edildi. İncelenen hastaların yaş gruplarına ve cinsiyete göre seroprevalans değerleri hesaplandı ve gruplar arası veya ci ...Daha fazlası

Makale 2021 KLİNİK ÇALIŞMA/RESEARCH ARTICLE26 ( 3 ) , pp. 5 - 544 0 Görüntülenme
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Niğde İlinde Yaş Gruplarına Göre Hepatit A, B ve C Seroprevalansı

TUĞÇE ŞİMŞEK BOZOK | TAYLAN BOZOK

Giriş: Viral hepatitler insan sağlığını tehdit eden, morbidite ve mortalitesi yüksek olan önemli bir sağlık sorunudur. Bu çalışmada Niğde ilinde yaş gruplarına ve cinsiyete göre hepatit A, B ve C seroprevalansının araştırılması ve karşılaştırılması amaçlandı. Materyal ve Metod: Çalışmamıza Kasım 2016-Kasım 2019 tarihleri arasında Niğde Eğitim ve Araştırma Hastanesi’nde çeşitli nedenlerle hepatit markerları çalışılan hastalar dahil edildi. Sonuçlar retrospektif olarak analiz edildi. İncelenen hastaların yaş gruplarına ve cinsiyete göre seroprevalans değerleri hesaplandı ve gruplar arası veya ci ...Daha fazlası

Makale 2021 KLİNİK ÇALIŞMA/RESEARCH ARTICLE26 ( 3 ) , pp. 5 - 544 0 Görüntülenme
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A Study Investigating the Role of 2 Candidate SNPs in Bax and Bcl-2 Genes in Alzheimer’s Disease

MEHMET EMİN ERDAL | MUSTAFA ERTAN AY | AYNUR ÖZGE | BAHAR TAŞDELEN

Objective: The proto-oncogene Bax (Bcl-2-associated X protein) and related protein Bcl-2 (B-cell chronic lymphocytic leukemia/lymphoma-2) genes are triggers of apoptosis in Alzheimer’s disease (AD). The balance of these proteins has an important role in the death or life of a neuronal cell, and the functional polymorphisms in genes expressing these proteins have been found to promote apoptosis. To investigate the role of Bax and Bcl-2 genes in AD, we examined the presence of the 2 polymorphisms in peripheral blood. To our knowledge, this is the first clinical association study of these 2 funct ...Daha fazlası

Makale 2020 PRHSJ, Puerto Rico Medical Sciences Journal39 ( 3 ) , pp. 2 - 269 0 Görüntülenme
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LACK OF ASSOCIATION OF CATECHOL-OMETHYLTRANSFERASE GENE POLYMORPHISM IN OBSESSIVE–COMPULSIVE DISORDER

MEHMET EMİN ERDAL | ŞENEL ACAR | MUSTAFA KEMAL YAZICI | AYLİN ERTEKİN YAZICI | EBRU DERİCİ EKER

The COMT gene has been implicated to be involved in the pathogenesis of obsessive–compulsive disorder (OCD) and various other psychiatric disorders. COMTenzyme activity is governed by a common genetic polymorphism at codon 158 that results in substantial 3- to 4-fold variation in enzymatic activity [a high-activity COMT variant (H) and a low activity variant (L)]. This study evaluates the association between OCD and the COMT gene polymorphism. Fifty-nine OCD patients that were diagnosed according to DSM-IV criteria and 114 healthy control subjects were included in the study. PCR technique was ...Daha fazlası

Makale 2003 DEPRESSION AND ANXIETY18 , pp. 4 - 45 4 Görüntülenme
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Significance of the catechol-O-methyltransferase gene polymorphism in migraine

MEHMET EMİN ERDAL

The objective was to assess the significance of the catechol-o-methyltransferase (COMT) enzyme polymorphism in migraine. For this reason, 62 migraineurs and 64 healthy volunteers were included in the study. The analysis of COMT polymorphism was performed using PCR. The H/H genotype was more frequent in the control group than in the patients group (P50.032). The homozygous or heterozygous L allele was over represented in the migraineurs compared with the controls (P50.013). The L/L genotype was over represented in the migraineurs who also had a family history of migraine (P50.003). There was no ...Daha fazlası

Makale 2001 Molecular Brain Research94 , pp. 1 - 196 2 Görüntülenme
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