Browsing by Author "Karaaslan, A"

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    Modification of friction and wear properties of PET membrane fabrics by MEVVA ion implantation
    Öktem, T; Tarakcoglu, I; Özdogan, E; Öztarhan, A; Namligöz, ES; Karaaslan, A; Tek, Z
    Polyethylene terephthalate (PET) membrane fabrics were modified by Ti, W, Ti + N, Cr + N and C + N implantations using a metal vapor vacuum arc (MEVVA) source at an accelerating voltage of 30 kV with doses ranging from 1 x 10(15) to 5 x 10(16) ions cm(-2) in TUBITAK Textile Research Center in Izmir. After implantation, changes in the mechanical properties of the samples were investigated. The results indicated that friction coefficient and wear loss values decreased significantly. This decrease depended on the used ion species and the doses. The surface morphologies of samples were examined by SEM and AFM. The changes in chemical structure were observed by IR spectra. (c) 2007 Elsevier B.V. All rights reserved.
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    Antibiotic associated diarrhea in outpatient pediatric antibiotic therapy
    Basaranoglu, ST; Karaaslan, A; Sali, E; Çiftçi, E; Aydin, ZGG; Kocabas, BA; Kaya, C; Bayturan, SS; Kara, SS; Çiftdogan, DY; Çay, Ü; Aktürk, HG; Çelik, M; Ozdemir, H; Somer, A; Diri, T; Yazar, AS; Sütçü, M; Tezer, H; Oncel, EK; Kara, M; Çelebi, S; Parlakay, AÖ; Karakaslilar, S; Arisoy, ES; Tanir, G; Kara, TT; Devrim, I; Erat, T; Aykaç, K; Kaba, Ö; Güven, S; Yesil, E; Yilmaz, AT; Durmus, SY; Çaglar, I; Günay, F; Özen, M; Dinleyici, EÇ; Kara, A
    BackgroundAntibiotic-associated diarrhea is one of the most frequent side effects of antimicrobial therapy. We assessed the epidemiological data of antibiotic-associated diarrhea in pediatric patients in our region.MethodsThe prospective multi-center study included pediatric patients who were initiated an oral antibiotic course in outpatient clinics and followed in a well-established surveillance system. This follow-up system constituded inclusion of patient by the primary physician, supply of family follow-up charts to the family, passing the demographics and clinical information of patient to the Primary Investigator Centre, and a close telephone follow-up of patients for a period of eight weeks by the Primary Investigator Centre.ResultsA result of 758 cases were recruited in the analysis which had a frequency of 10.4% antibiotic-associated diarrhea. Among the cases treated with amoxicillin-clavulanate 10.4%, and cephalosporins 14.4% presented with antibiotic-associated diarrhea. In the analysis of antibiotic-associated diarrhea occurrence according to different geographical regions of Turkey, antibiotic-associated diarrhea episodes differed significantly (p = 0.014), particularly higher in The Eastern Anatolia and Southeastern Anatolia. Though most commonly encountered with cephalosporin use, antibiotic-associated diarrhea is not a frequent side effect.ConclusionThis study on pediatric antibiotic-associated diarrhea displayed epidemiological data and the differences geographically in our region.
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    SARS-CoV-2 seropositivity among pediatric health care personnel after the first peak of the pandemic: nationwide surveillance in Turkey
    Oygar, PD; Büyükçam, A; Bal, ZS; Dalgiç, N; Bozdemir, SE; Karbuz, A; Çetin, BS; Kara, Y; Çetin, C; Hatipoglu, N; Uygun, H; Aygün, FD; Törün, SH; Okur, DS; Çiftdogan, DY; Kara, TT; Yahsi, A; Özer, A; Demir, SÖ; Akkoç, G; Turan, C; Sali, E; Sen, S; Erdeniz, EH; Kara, SS; Emiroglu, M; Erat, T; Aktürk, H; Gürlevik, SL; Sütçü, M; Aydin, ZGG; Atikan, BY; Yesil, E; Güner, G; Çelebi, E; Efe, K; Isançli, DK; Durmus, HS; Tekeli, S; Karaaslan, A; Bülbül, L; Almis, H; Kaba, Ö; Keles, YE; Yazicioglu, B; Oguz, SB; Ovali, HF; Dogan, HH; Çelebi, S; Çakir, D; Karasulu, B; Alkan, G; Yenidogan, I; Gül, D; Küçükalioglu, BP; Avcu, G; Kukul, MG; Bilen, M; Yasar, B; Üstün, T; Kiliç, Ö; Akin, Y; Cebeci, SO; Bucak, IH; Yanartas, MS; Sahin, A; Arslanoglu, S; Elevli, M; Çoban, R; Öz, SKT; Hatipoglu, H; Erkum, IT; Turgut, M; Demirbuga, A; Özçelik, T; Çiftçi, D; Sari, EE; Akkus, G; Hatipoglu, SS; Dinleyici, EÇ; Hacimustafaoglu, M; Özkinay, F; Kurugöl, Z; Cengiz, AB; Somer, A; Tezer, H; Kara, A
    Background: Understanding SARS-CoV-2 seroprevalence among health care personnel is important to ex-plore risk factors for transmission, develop elimination strategies and form a view on the necessity and frequency of surveillance in the future. Methods: We enrolled 4927 health care personnel working in pediatric units at 32 hospitals from 7 different regions of Turkey in a study to determine SARS Co-V-2 seroprevalence after the first peak of the COVID-19 pandemic. A point of care serologic lateral flow rapid test kit for immunoglobulin (Ig)M/IgG was used. Seroprevalence and its association with demographic characteristics and possible risk factors were analyzed. Results: SARS-CoV-2 seropositivity prevalence in health care personnel tested was 6.1%. Seropositivity was more common among those who did not universally wear protective masks (10.6% vs 6.1%). Having a COVID-19-positive co-worker increased the likelihood of infection. The least and the most experienced personnel were more likely to be infected. Most of the seropositive health care personnel (68.0%) did not suspect that they had previously had COVID-19. Conclusions: Health surveillance for health care personnel involving routine point-of-care nucleic acid testing and monitoring personal protective equipment adherence are suggested as important strategies to protect health care personnel from COVID-19 and reduce nosocomial SARS-CoV-2 transmission. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.
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    Epidemiological, Clinical, and Laboratory Features of Children With COVID-19 in Turkey
    Karbuz, A; Akkoc, G; Demirdag, TB; Ciftdogan, DY; Ozer, A; Cakir, D; Torun, SH; Kepenekli, E; Erat, T; Dalgic, N; Ilbay, S; Karaaslan, A; Erdeniz, EH; Aygun, FD; Bozdemir, SE; Hatipoglu, N; Emiroglu, M; Bal, ZS; Ciftci, E; Bayhan, GI; Aydin, ZGG; Demir, SO; Kilic, O; Hacimustafaoglu, M; Okur, DS; Sen, S; Yahsi, A; Akturk, H; Cetin, B; Sutcu, M; Kara, M; Uygun, H; Kara, TT; Korukluoglu, G; Akgun, O; èstundag, G; Mis, MD; Sali, E; Kaba, O; Yakut, N; Kilic, O; Kanik, MK; Cetin, C; Dursun, A; Cicek, M; Kockuzu, E; Sevketoglu, E; Alkan, G; Ozenen, GG; Ince, E; Baydar, Z; Ozkaya, AK; Ovali, HF; Tekeli, S; Celebi, S; Cubukcu, B; Bal, A; Khalilova, F; Kose, M; Hatipoglu, HU; Dalkiran, T; Turgut, M; Altas, AB; Duru, HNS; Aksay, A; Saglam, S; Yanartas, MS; Ergenc, Z; Akin, Y; Kar, YD; Sahin, S; Tuteroz, SK; Bilen, NM; Ozdemir, H; Senoglu, MC; Kucukalioglu, BP; Besli, GE; Kara, Y; Turan, C; Demirtas, BS; Celikyurt, A; Cosgun, Y; Elevli, M; Sahin, A; Oguz, SB; Somer, A; Karadag, B; Demirhan, R; Dagi, HT; Kurugol, Z; Taskin, EC; Sahiner, A; Yesil, E; Keles, YE; Sarikaya, R; Eralp, EE; Ozkinay, F; Konca, HK; Yilmaz, S; Gokdemir, Y; Arga, G; Ozen, S; Coksuer, F; Vatansever, G; Tezer, H; Kara, A
    Objectives: The aim of this study is to identify the epidemiological, clinical, and laboratory features of coronavirus disease 2019 (COVID-19) in children. Methods: A retrospective study was conducted by pediatric infectious disease specialists from 32 different hospitals from all over Turkey by case record forms. Pediatric cases who were diagnosed as COVID-19 between March 16, 2020, and June 15, 2020 were included. Case characteristics including age, sex, dates of disease onset and diagnosis, family, and contact information were recorded. Clinical data, including the duration and severity of symptoms, were also collected. Laboratory parameters like biochemical tests and complete blood count, chest X-ray, and chest computed tomography (CT) were determined. Results: There were 1,156 confirmed pediatric COVID-19 cases. In total, male cases constituted 50.3% (n = 582) and females constituted 49.7% (n = 574). The median age of the confirmed cases was 10.75 years (4.5-14.6). Of the total cases, 90 were younger than 1 year of age (7.8%), 108 were 1-3 years of age (9.3%), 148 were 3-6 years of age (12.8%), 298 were 6-12 years of age (25.8%), 233 were 12-15 years of age (20.2%), and 268 cases were older than 15 years of age (23.2%). The most common symptom of the patients at the first visit was fever (50.4%) (n = 583) for a median of 2 days (IQR: 1-3 days). Fever was median at 38.4 degrees C (38.0-38.7 degrees C). The second most common symptom was cough (n = 543, 46.9%). The other common symptoms were sore throat (n = 143, 12.4%), myalgia (n = 141, 12.2%), dyspnea (n = 118, 10.2%), diarrhea (n = 112, 9.7%), stomachache (n = 71, 6.1%), and nasal discharge (n = 63, 5.4%). When patients were classified according to disease severity, 263 (22.7%) patients were asymptomatic, 668 (57.7%) patients had mild disease, 209 (18.1%) had moderate disease, and 16 (1.5%) cases had severe disease. One hundred and forty-nine (12.9%) cases had underlying diseases among the total cases; 56% of the patients who had severe disease had an underlying condition (p < 0.01). The need for hospitalization did not differ between patients who had an underlying condition and those who do not have (p = 0.38), but the need for intensive care was higher in patients who had an underlying condition (p < 0.01). Forty-seven (31.5%) of the cases having underlying conditions had asthma or lung disease (38 of them had asthma). Conclusions: To the best of our knowledge, this is one of the largest pediatric data about confirmed COVID-19 cases. Children from all ages appear to be susceptible to COVID-19, and there is a significant difference in symptomatology and laboratory findings by means of age distribution.
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    Investigating the applicability technique (MEVVA) to textile of metal ion implantation surfaces
    Öktem, T; Özdogan, E; Namligöz, SE; Öztarhan, A; Tek, Z; Tarakçioglu, I; Karaaslan, A
    Polyethylene terephalate (PET) samples were modified by Cu, C, Ti, and Cr implantation using a metal vapor vacuum arc (MEVVA) implanter. The ions were implanted at an accelerating voltage of 30 kV with a dose ranging from 1 x 10(14) to 1 x 10(7) ions/cm(2). In the first part of this study, Cu ions were implanted to improve the electrical properties of PET woven fabrics, and in the second part, C, Ti and Cr ions were implanted to enhance the mechanical properties of PET membrane fabrics. After implantation, the results showed that the half-charge decay time of implanted fabric lessened to milliseconds, and the friction coefficient and wear loss values decreased significantly. The surface morphologies of the samples were examined by scanning electron microscopy and atomic force microscopy. The changes in chemical structure were observed by IR spectra.