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        • KCI등재

          Killing Magnetic Flux surfaces in Euclidean 3-space

          Zehra,Ozdemir,Ismail,Gok,Yusuf,Yayli,F.,Nejat,EKMEKCI 호남수학회 2019 호남수학학술지 Vol.41 No.2

          In this paper, we give a geometric approach to Killing magnetic flux surfaces in Euclidean 3-space and solve the differential equations which expressed the mentioned surfaces. Furthermore we give some examples and draw their pictures by using the programme Mathematica.

        • KCI등재SCOPUS

          A SURVEY ON SOME OLD AND NEW IDENTITIES ASSOCIATED WITH LAPLACE DISTRIBUTION AND BERNOULLI NUMBERS

          ZEHRA,SELIN,ASKAN,IREM,KUCUKOGLU,Yilmaz,,Simsek 장전수학회 2020 Advanced Studies in Contemporary Mathematics Vol.30 No.4

          The purpose of this paper is to give some survey on old and new identities related to the characteristic function, the Laplace distribution and special numbers and polynomials with comparative results and observations. Additionally, we give some computation formulas for the higher-order moments of some kinds of random variables with the Laplace distribution in terms of the Bernoulli numbers of the first kind, the Euler numbers of the second kind and Riemann zeta function by using the techniques of generating functions and characteristic function of the aforementioned random variables. Finally, with the aid of the Hankel determinants formed by the moments corresponding to the weight function that reveals the orthogonality feature of the orthogonal polynomials, we give futher remarks and observations on not only orthogonality properties of some orthogonal polynomials such as the Hermite polynomials, but also construction methods of the three-term recurrence relations for the orthogonal polynomials.

        • KCI등재

          Attitudes of the International Community toward Iran's Nuclear Puzzle

          Zehra,Nilufer,Karacasulu,Irem,askar,Karakir 서울대학교 국제학연구소 2008 Journal of International and Area Studies Vol.15 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This article aims to interrogate the attitudes of the US, the EU/EU-3, Russia and China, on Iran's nuclear programme. The underlying question is whether there can be a consensus in the international community for a comprehensive settlement. In trying to provide answer to this question first, the article briefly reviews Iranian motives and foreign assistance in the development of Iran's nuclear programme. Secondly, focusing separately on the US, the EU/EU-3, Russia and China, a comparative analysis is employed for delineating similarities and differences in their attitudes and concerns since the 1979 Iranian Revolution. This article arrived at a tentative conclusion on the basis that the debate is likely to continue, as there is no common attitude toward Iran's nuclear puzzle in the international community.

        • KCI등재SCOPUS

          Purification and Characterization of an Alkali-Thermostable Lipase from Thermophilic Anoxybacillus flavithermus HBB 134

          ( Zehra Burcu Bakir ), ( Kubilay Metin ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.6

          An intracellular lipase from Anoxybacillus flavithermus HBB 134 was purified to 7.4-fold. The molecular mass of the enzyme was found to be about 64 kDa. The maximum activity of the enzyme was at pH 9.0 and 50oC. The enzyme was stable between pH 6.0 and 11.0 at 25°C, 40°C, and 50°C for 24 h. The Km and Vmax of the enzyme for pNPL substrate were determined as 0.084 mM and 500 U/mg, respectively. Glycerol, sorbitol, and mannitol enhanced the enzyme thermostability. The enzyme was found to be highly stable against acetone, ethyl acetate, and diethyl ether. The presence of PMSF, NBS, DTT and β-mercaptoethanol inhibited the enzyme activity. Hg(2+), Fe(3+), Pb(2+), Al(3+), and Zn(2+) strongly inhibited the enzyme whereas Li(+), Na(+), K(+), and NH4(+) slightly activated it. At least 60% of the enzyme activity and stability were retained against sodium deoxycholate, sodium taurocholate, n-octyl-β-D-glucopyranoside, and CHAPS. The presence of 1% Triton X-100 caused about 34% increase in the enzyme activity. The enzyme is thought to be a true lipase since it has preferred the long-chain triacylglycerols. The lipase of HBB 134 cleaved triolein at the 1- or 3-position.

        • KCI등재후보

          Decompositions of soft continuity and soft AB-continuity

          Zehra,Guzel,Ergul,Naime,Tozlu 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.14 No.5

          In this paper, we introduce soft semi-regular sets, soft AB-sets and soft $% \alpha $AB-sets in soft topological spaces which are defined over an initial universe with a fixed set of parameters. We discuss their relationships with other weaker forms of soft open sets like soft semi-open sets, soft A-sets and soft B-sets. We also introduce the concepts of soft AB-continuous function and soft $\alpha $AB-continuous function. The new decompositions of soft continuity are provided.

        • Outcomes of 1st Remission Induction Chemotherapy in Acute Myeloid Leukemia Cytogenetic Risk Groups

          Zehra,,Samreen,Najam,,Rahela,Farzana,,Tasneem,Shamsi,,Tahir,Sultan Asian Pacific Organization for Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12

          Background: Diagnostic karyotyping analysis is routinely used in acute myeloid leukemia (AML) clinics. Categorization of patients into risk stratified groups (favorable, intermediate and adverse) according to cytogenetic findings can serve as a valuable independent prognostic factor. Method and Material: A retrospective descriptive study was conducted based on the patient records of newly diagnosed non-M3 AML young adult cases undergoing standard 3+7 i.e, Daunorubicin and Ara-C (DA) as remission induction chemotherapy. Diagnostic cytogenetic analysis reports were analyzed to classify the patients into risk stratified groups according to South West Oncology Group criteria and prognostic significance was measured with reference to achievement of haematological remission after 1st induction chemotherapy. Results:A normal karyotype was commonly expressed, found in 47.2% of patients, while 65% (n=39) appeared to have intermediate risk cytogenetics, and 13.3% (n=8) adverse or unclassified findings. Favourable cytogenetics was least frequent in the patient cohort, accounting for only 8.3 % (n=5).The impact of cytogenetic risk groups on achievement of haematological remission was evaluated by applying Pearson Chi-square, and was found to be non-significant (df=12, p=0.256) but when the outcomes of favourable risk groups with intermediate, adverse and unclassified findings compared, results were highly significant (df=6, p=0.000) for each comparison. In patients of the favourable cytogenetic risk group, HR?? was reported in 40% (n=2/5), as compared to 62.2% (n=23/37) in the intermediate cytogenetic risk group, 57.1% (n=4/7) in the adverse cytogenetic risk group and 28.6% (n=2/7) in hte unclassified cytogenetic risk group. Conclusion: Cytogenetic risk stratification for AML cases following criteria provided by international guidelines did not produce conclusive results in our Pakistani patients. However, we cannot preclude an importance as the literature clearly supports the use of pretreatment karyotyping analysis as a significant predictive marker for clinical outcomes. The apparent differences between Pakistani and Western studies indicate an urgent need to develop risk stratification guidelines according to the specific cytogenetic makeup of South Asian populations.

        • KCI등재

          Post-operative Hypocalcaemia Following Open Thyroidectomy for Benign Multinodular Goiters Using FOCUS Harmonic Scalpel Versus Conventional Suture Ligation Technique for Hemostasis: a Prospective, Single-blind, Randomized Controlled Trial

          Sadaf,Zehra,Sughra,Parveen 대한갑상선-내분비외과학회 2018 The Koreran journal of Endocrine Surgery Vol.18 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          Purpose: Vessel hemostasis during thyroidectomy reduces the risk of post-operative hypocalcaemia and is achieved using several techniques. The aim of this study was to compare the occurrence of hypocalcaemia 24-48 hours following total thyroidectomy using FOCUS harmonic scalpel (HS) versus conventional suture ligation (CSL). Methods: A prospective, single-blind, randomized trial in which 76 patients with benign multinodular goiters were randomized into two groups to receive total thyroidectomy using HS (n=38) or CSL (n=38) techniques. Patients were monitored for hypocalcaemia at 24 and 48 hours post- thyroidectomy and their length of postoperative hospital stay was recorded. Statistical analysis was performed using Student's t-test using SPSS to detect significant differences between groups. Results: The incidence of post-operative hypocalcaemia was 15.79% in the HS group, and 36.84%, in the CSL group (p =0.033). The number of in situ parathyroid glands was significantly associated with hypocalcaemia in the CSL group (P=0.019), but not in the HS group (P=0.372). Length of hospital stay was 2.63±0.85 in the CSL group and 1.37±0.67 days in the HS group (P<0.001). Conclusion: Compared to conventional hemostasis, FOCUS HS reduces the overall risk of hypocalcaemia during thyroidectomy for benign thyroid disease. The conventional suture ligation technique should be replaced with FOCUS HS technique for thyroidectomy.

        • KCI등재

          KILLING MAGNETIC FLUX SURFACES IN EUCLIDEAN 3-SPACE

          Ozdemir,,Zehra,Gok,,Ismail,Yayli,,Yusuf,Ekmekci,,F.,Nejat The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.2

          In this paper, we give a geometric approach to Killing magnetic flux surfaces in Euclidean 3-space and solve the differential equations which expressed the mentioned surfaces. Furthermore we give some examples and draw their pictures by using the programme Mathematica.

        • SCIESCOPUSKCI등재

          Purification and Characterization of an Alkali-Thermostable Lipase from Thermophilic Anoxybacillus flavithermus HBB 134

          Bakir,,Zehra,Burcu,Metin,,Kubilay The Korean Society for Microbiology and Biotechnol 2016 Journal of microbiology and biotechnology Vol.26 No.6

          An intracellular lipase from Anoxybacillus flavithermus HBB 134 was purified to 7.4-fold. The molecular mass of the enzyme was found to be about 64 kDa. The maximum activity of the enzyme was at pH 9.0 and 50℃. The enzyme was stable between pH 6.0 and 11.0 at 25℃, 40℃, and 50℃ for 24 h. The K<sub>m</sub> and V<sub>max</sub> of the enzyme for pNPL substrate were determined as 0.084 mM and 500 U/mg, respectively. Glycerol, sorbitol, and mannitol enhanced the enzyme thermostability. The enzyme was found to be highly stable against acetone, ethyl acetate, and diethyl ether. The presence of PMSF, NBS, DTT and β-mercaptoethanol inhibited the enzyme activity. Hg<sup>2+</sup>, Fe<sup>3+</sup>, Pb<sup>2+</sup>, Al<sup>3+</sup>, and Zn<sup>2+</sup> strongly inhibited the enzyme whereas Li<sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, and NH<sub>4</sub><sup>+</sup> slightly activated it. At least 60% of the enzyme activity and stability were retained against sodium deoxycholate, sodium taurocholate, n-octyl-β-D-glucopyranoside, and CHAPS. The presence of 1% Triton X-100 caused about 34% increase in the enzyme activity. The enzyme is thought to be a true lipase since it has preferred the long-chain triacylglycerols. The lipase of HBB 134 cleaved triolein at the 1- or 3-position.

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