Evaluation of public’s perception of scar cosmesis after thyroidectomy: results of a survey of Turkish versus South Korean individuals

Erman Alci,Soo Young Kim,Hyeok Jun Yun,Seda Gozener,Murat Ozdemir,Yigit Turk,Hur Hassoy,Yong Sang Lee,Seok-Mo Kim,Gokhan Icoz,Hang-Seok Chang,Ozer Makay 대한외과학회 2023 Annals of Surgical Treatment and Research(ASRT) Vol.105 No.3

Determination of Saturated and Unsaturated Fatty Acids Amount in Leukocyte Membranes from Subjects Fed with Solid and Fluid Oils

Erman, Fazilet,Aydin, Suleyman,Demir, Yasar,Akcay, Fatih,Bakan, Ebubekir Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.5

Modifications in dietary fatty acid intake might lead to a modification in membrane phospholipid fatty acid composition. The purpose of this study was to investigate relationship between different type of oil consumption and leukocyte membrane phospholipid composition. This study was carried out in subjects utilizing butter (n = 15), margarine (n = 15), fluid oil (n = 15) and mixed types of oils (n = 15) in total 60 subjects. Leukocytes were separated from total blood by dextran sedimentation method. Membrane lipids and proteins were isolated following the cell disruption. Fatty acids of membrane phospholipids were isolated by hydrolysation with phospholipase B under ultrasonic dismembranator. Free fatty acids were identified with gas chromatography at chloroform phase. The results obtained were compared with data obtained by chromatograms of the standards. Results more prominent values of arachidic, dihomo-$\gamma$-linolenic and palmitoleic acids were found in butter-or mixed oil-user groups; eicosadienoic, eicosamonoenoic, dihomo-$\gamma$-linolenic and behenic acids in fluid oil; heptanoic, valeric, eicosadienoic and linolenic acids in margarine groups. The fatty acid composition of mixed oil was similar to butter, while other two oils were so different. From this study, it was concluded that the type of oil consumption might have an influence on phospholipid components of plasma membranes.

Cytochrome c Peroxidase: A Model Heme Protein

Erman, James E.,Vitello, Lidia B. Korean Society for Biochemistry and Molecular Biol 1998 Journal of biochemistry and molecular biology Vol.31 No.4

Cytochrome c peroxidase (CcP) is a yeast mitochondrial enzyme which catalyzes the reduction of hydrogen peroxide to water using two equivalents of ferrocytochrome c. The CcP/cytochrome c system has many features which make it a very useful model for detailed investigation of heme protein structure/function relationships including activation of hydrogen peroxide, protein-protein interactions, and long-range electron transfer. Both CcP and cytochrome c are single heme, single subunit proteins of modest size. High-resolution crystallographic structures of both proteins, of one-to-one complexes of the two proteins, and a number of active-site mutants are available. Site-directed mutagenesis studies indicate that the distal histidine in CcP is primarily responsible for rapid utilization of hydrogen peroxide implying significantly different properties of the distal histidine in the peroxidases compared to the globins. CcP and cytochrome c bind to form a dynamic one-to-one complex. The binding is largely electrostatic in nature with a small, unfavorable enthalpy of binding and a large positive entropy change upon complex formation. The cytochrome c-binding site on CcP has been mapped in solution by measuring the binding affinities between cytochrome c and a number of CcP surface mutations. The binding site for cytochrome c in solution is consistent with the crystallographic structure of the one-to-one complex. Evidence for the involvement of a second, low-affinity cytochrome c-binding site on CcP in long-range electron transfer between the two proteins is reviewed.

Controlling of the Optical Properties of the Solutions of the PTCDI-C8 Organic Semiconductor

Erman Erdoğan,Bayram Gündüz 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6

N,N′-Dioctyl-3,4,9,10 perylenedicarboximide (PTCDI-C8) organicsemiconductor have vast applications in solar cells, thermoelectricgenerators, thin film photovoltaics and many other optoelectronicdevices. These applications of the materials are based on their spectraland optical properties. The solutions of the PTCDI-C8 for differentmolarities were prepared and the spectral and optical mesaurementswere analyzed. Effects of the molarities on optical properties wereinvestigated. Vibronic structure has been observed based on theabsorption bands of PTCDI-C8 semiconductor with seven peaks at2.292, 2.451, 2.616, 3.212, 3.851, 4.477 and 4.733 eV. The importantspectral parameteres such as molar/mass extinction coefficients,absorption coefficient of the PTCDI-C8 molecule were calculated. Optical properties such as angle of incidence/refraction, optical bandgap, real and imaginary parts of dielectric constant, loss factor andelectrical susceptibility of the the PTCDI-C8 were obtained. Finally,we discussed these parameters for optoelectronic applications andcompared with related parameters in literature.

Physical, electrochemical and supercapacitive properties of activated carbon pellets from pre-carbonized rubber wood sawdust by CO2 activation

Erman Taer,Mohamad Deraman,Ibrahim Abu Talib,Akrajas Ali Umar,Munetaka Oyama,Rozan Mohamad Yunus 한국물리학회 2010 Current Applied Physics Vol.10 No.4

The physical and electrochemical properties of the activated carbon pellet electrodes have been investigated. Activated carbon pellets were prepared from single step carbonization process of pre-carbonized rubber wood sawdust at a temperature of 800 ℃ that followed with a CO2 activation process at temperature in the range of 700–1000 ℃. The BET characterization on the sample found that the surface area of the carbon pellet increased with the increasing of the activation temperature. The optimum value was as high as 683.63 ㎡ g-1. The electrical conductivity was also found to increase linearly with the increasing of the activation temperature, namely from 0.0075 S cm-1 to 0.0687 S cm-1 for the activation temperature in the range of 700–1000 ℃. The cyclic voltammetry characterization of the samples in aqueous solution of 1 M H2SO4 also found that the specific capacitance increased with the increasing of the activation temperature. Typical optimum value was shown by the sample activated at 900 ℃ with the specific capacitance was as high as 33.74 Fg-1 (scan rate 1 mV s-1). The retained ratio was as high as 32.72%. The activated carbon pellet prepared from the rubber wood sawdust may found used in supercapacitor applications.

Managing human capital for innovative activities in Indonesian herbal medicine firms

Erman Aminullah,Wati Hermawati,Trina Fizzanty,Qinan M. B. Soesanto 기술경영경제학회 2017 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.25 No.2

This paper attempts to explain human capital enhancement (HCE)practices in upgrading human skills, knowledge and ability,specifically (i) how firms’ internal upgrading mechanisms areimplemented and (ii) how firms enhance human capital throughinteractions with external parties. Through case studies ofIndonesian herbal medicine firms, this study reveals that HCE forinnovative activities in herbal medicine firms occurred throughinnovative learning – by using and interacting. Companies showlearning by using traditional herbal ingredients to redesigninnovative products; managing continuously internal learning byinteracting across functional teams to create new, innovativeproducts; and managing external learning by interacting withexternal parties in the search for new, innovative products. Theeffective use of internal and external sources of innovation iscoordinated by, respectively, top management direction inside thecompany without research and development (R&D); managers ofcross-functional teams within the company with in-house R&Dactivities; and top-level management meetings within thecompany with limited R&D activities.

Technological convergence in Indonesian firms: cases of biobased chemical product innovation

Erman Aminullah,Trina Fizzanty,Galuh S. Indraprahasta,Indri J. Asmara 기술경영경제학회 2015 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.23 No.-

This paper attempts to explain how technological convergence has occurred in Indonesianchemical firms. Viewed from the sectoral innovation system, the enabling factors ofbiobased chemical products innovation are the availability of scientist and researcher atuniversity and research collaboration in company. The ways forward to promotetechnological convergence in Indonesian biobased chemical firms are to enhance its internaland external R&D capacity by supporting chemical firms to interact with public R&D anduniversity. To enable the biobased chemical sector to take the opportunities to grow throughtechnological convergence, the Indonesian government policy should (i) provide strongsupport for research, development, and commercialisation of innovative biobased products,and incentives for pioneering the commercial production and (ii) facilitate the biobasedchemical value chains to develop by supporting biobased chemical investment, theadvocation of using biobased chemical products in society, and limiting of using petroleumbasedchemical products in the market.

Cytochrome c Peroxidase: A Model Heme Protein

Erman,James E.,Vitello,Lidia B. The Korea Science and Technology Center 1998 BMB Reports Vol.31 No.4

Cytochrome c peroxidase (CcP) is a yeast mitochondrial enzyme which catalyzes the reduction of hydrogen peroxide to water using two equivalents of ferrocytochrome c. The CcP/cytochrome c system has many features which make it a very useful model for detailed investigation of heme protein structure/function relationships including activation of hydrogen peroxide, protein-protein interactions, and long-range electron transfer. Both CcP and cytochrome c are single heme, single subunit proteins of modest size. High-resolution crystallographic structures of both proteins, of one-to-one complexes of the two proteins, and a number of active-site mutants are available. Site-directed mutagenesis studies indicate that the distal histidine in CcP is primarily responsible for rapid utilization of hydrogen peroxide implying significantly different properties of the distal histidine in the peroxidases compared to the globins. CcP and cytochrome c bind to form a dynamic one-to-one complex. The bindings is largely electrostatic in nature with a small, unfavorable enthalpy of binding and a large positive entropy change upon complex formation. The cytochrome c-binding site on CcP has been mapped in solution by measuring the binding affinities between cytochrome c and a number of CcP surface mutations. The binding site for cytochrome c in solution is consistent with the crystallographic structure of the one-to-one complex. Evidence for the involvement of a second, low-affinity cytochrome c-binding site on CcP in long-range electron transfer between the two proteins is reviewed.

A General Purpose Inverter Set-Up for Power Electronics Laboratory Experiments

Mustafa Erman Kayakesen,Isik Cadirci 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.4

A general purpose experimental set-up has been designed and implemented for students to carry out various experiments on inverters in the power electronics laboratories of universities, during a few hours of laboratory work. This is the first inverter setup that incorporates hardware and software control, as well as an optional user interface in a laboratory experimental set-up of a single multi-purpose inverter, thus making the system versatile and very practical for both undergraduate and graduate students. The system can be controlled either by a computer or through a liquid crystal display (LCD) and a keypad control unit, and it constitutes a low-cost alternative to relatively expensive commercial teaching sets. The computer provides a user friendly interface and easier control for laboratory environments equipped with computers. The LCD and keypad units eliminate the need for a computer, which makes this system usable in the laboratory as a standalone unit as well.

Key Technology for Optical Networks

Marko Erman 한국통신학회 1997 OPTOELECTRONICS & COMMUNICATIONS CONFERENCE Vol.2 No.1