Papers by Hilal Najim Hilal
Penggunaan Media Tiga Dimensi pada Pembelajaran Teknologi Informasi dan Komunikasi
; Penelitian tindakan kelas ini bertujuan untuk peningkatan motivasi dan hasil belajar siswa kela... more ; Penelitian tindakan kelas ini bertujuan untuk peningkatan motivasi dan hasil belajar siswa kelas VII/1 dengan menggunakan media tiga dimensi pada pokok bahasan mengidentifikasi perangkat-perangkat yang digunakan teknologi informasi dan komunikasi di SMP Negeri I Pallangga Kab.Gowa. Penelitian ini dilaksanakan selama 3 bulan dari bulan juli sampai dengan bulan September 2005, dan dilakukan dengan dua siklus yaitu: siklus I dengan model penugasan, dalam model ini siswa dibimbing untuk mengidentifikasi perangkat-perangkat yang digunakan teknologi informasi dan komunikasi serta menempelkan kartu-kartu pada perangkat tersebut kemudian dilanjutkan dengan tanya jawab. Sedangkan pada siklus II merupakan kelanjutan siklus I. Data kegiatan belajar siswa dan data kegiatan mengajar guru diperoleh dengan melakukan observasi kelas pada saat proses tindakan dilakukan yang dibuat oleh guru sedangkan data tentang hasil belajar siswa diperoleh melalui hasil tes terhadap siswa. Dari hasil pengamatan dan tes terhadap siswa terlihat adanya peningkatan minat dan motivasi serta hasil belajar siswa. Hal ini disebabkan oleh adanya peningkatan kemampuan dalam mengidentifikasi dan menempelkan kartu – kartu pada perangkat–perangkat yang digunakan teknologi informasi dan komunikasi pada media tiga dimensi.
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The Turkish journal of pediatrics
Adolescence is a transition period between childhood and adulthood in which physical, sexual and ... more Adolescence is a transition period between childhood and adulthood in which physical, sexual and psychosocial changes occur. Sexually Transmitted Infections (STI) are the most common reproductive health problems adolescents face. Peer education is a very useful method in adolescents' education, especially on risk factors and risk taking behaviors. This peer education intervention study, including two base line studies (one before and one after the intervention), was conducted in four classes of an Anatolian high school in Ankara in 2000. The aim of the study was to evaluate the success of the peer education model. There was a significant difference in the general scores of the students before (29.52; SD = 4.38) and after (31.89; SD = 4.96) education by peer educators (p = 0.000). This study might have assisted the study population in establishing safe sex practices for a healthy sexual future.
Toxicology, 2004
The present study was undertaken to investigate the involvement of oxidative damage in lead-induc... more The present study was undertaken to investigate the involvement of oxidative damage in lead-induced toxicity in humans and to enlighten whether oxidative stress indicators are correlated with the known indices of lead toxicity. For these purposes, selected oxidative stress parameters along with some clinical indices of lead poisoning were determined in blood of battery plant workers and control subjects. Workers had significantly increased erythrocyte malondialdehyde (MDA) levels, catalase and glucose-6-phosphate dehydrogenase (G6PD) activities, and decreased blood glutathione:glutathione disulfide ratio compared to the controls. Increased blood lead concentrations and zinc protoporphyrin (ZPP) levels, and decreased ␦-aminolevulinic acid dehydratase (ALAD) activity were used as clinical indices of lead toxicity. Statistically significant correlation between oxidative stress parameters and clinical indices implies that disrupted prooxidant/antioxidant balance might contribute to lead-induced toxicity in erythrocytes. A significant correlation was found between ALAD activity and blood lead levels in human subjects. Similarly significant correlation between ALAD activity and erythrocyte MDA concentrations was shown. Present data indicates that ALAD can serve as a valuable biomarker of oxidative stress in lead-exposed hematological system as well as being a biochemical indicator of lead exposure.
Tourism Management, 2009
The importance of developing global as well as local networks between tourism firms and clusters ... more The importance of developing global as well as local networks between tourism firms and clusters seeking to attain global competitiveness has been increasingly emphasized in previous studies. The aim of this paper is to examine the role of local and global networking in firms of different sizes and of differentiated cluster types (based on specialization and agglomeration) in tourism. This paper differs from previous researches in that it addresses the tourism dimension of the networking literature and employs a quantitative method of analysis based on a firm-level survey. The findings of this paper reveal that there is a positive relation between large firms and the global level of networking. The specialization and agglomeration of firms in a cluster does not determine the level of connectedness, but rather it is the size of the firm in a cluster that determines the level of networking of that cluster. Based on the research findings, the paper explores the necessity of developing networks not only at a local level but also at a global level by emphasizing the defining factors.
The Journal of Physical Chemistry B, 2001
The kinetics of the electrochemical deposition and desorption of sulfur monolayers on highly orie... more The kinetics of the electrochemical deposition and desorption of sulfur monolayers on highly oriented Au(111) and polycrystalline Au electrodes in aqueous solutions containing sodium sulfide was studied by cyclic voltammetry, chronocoulometry, and chronoamperometry. Cyclic voltammetry experiments reveal that underpotential deposition (upd) and stripping of sulfur takes place at two different potentials at polycrystalline Au substrates leading to two oxidative and two reductive peaks. However, sulfur upd consists of only one oxidative and reductive peak at single crystalline Au(111) substrates. Electrosorption valancy measurements and pH dependency showed that the upd of sulfur involved two-electron and one-step mechanism. The charge corresponding to one monolayer of sulfur was determined by cyclic voltammetry and chronocoulometry, indicating a 0.33 coverage. The chronoamperometric results at polycrystalline Au electrodes indicates that deposition takes place in a Langmuir-type mechanism, whereas the stripping of sulfur follows a two-dimensional nucleation and growth mechanism which is accompanied by Langmuir adsorption. Although the appearance of current transients, observed for the deposition of sulfur on Au(111), was similar to what seen for deposition on polycrystalline Au substrates, the stripping process was totally different from deposition, involving only a two-dimensional nucleation and growth mechanism, at pH 12. From an analysis of the desorption current transient, we describe the stripping mechanism as instantaneous. Chronoamperometry experiments suggest that sulfur is first adsorbed on to a Au(111) surface randomly, then reorganizes itself to form a well-ordered structure, and finally strips off in a two-dimensional nucleation and growth mechanism.
Pakistan Journal of Nutrition, 2005
In this research, we have aimed to determine antagonistic effects of various lactic acid bacteria... more In this research, we have aimed to determine antagonistic effects of various lactic acid bacteria against Gram (+) and Gram (-) bacteria with a comparison of disc diffusion and spot-on-lawn method. In spot-on-lawn method, P. aeruginosa ATCC 27853 was the most sensitive of the tested bacteria, followed by E. coli ATCC 25927 and P. aeruginosa ATCC 10145. On the other hand, in disc diffusion assay B. subtilis ATCC 6633, E. coli O157:H7 and P. aeruginosa ATCC 10145 were the most sensitive indicator microorganisms. The spot-on-lawn method was suitable for assessing the antagonistic effect of lactic acid bacteria. In general, inoculum density had little effect on inhibition.
Biomodification of non-woven polyester fabrics by insulin and RGD for use in serum-free cultivation of tissue cells
Biomaterials, 2002
In this study, the development of a novel cell support material was purposed as due to the serum-... more In this study, the development of a novel cell support material was purposed as due to the serum-free cultivation of tissue cells. This material was prepared by immobilizing RGD (Arg-Gly-Asp) sequence of cell-adhesion factor, fibronectin, and cell-growth factor, insulin, to the three-dimensional non-woven polyester fabric (briefly NWPF) discs that have been used successfully in our previous cell culture studies. At first these matrices were partially hydrolyzed and then the carboxyl groups were coupled with RGD or insulin in the presence of water-soluble carbodiimide. The effectiveness of immobilization process was checked with SEM, ATR-FTIR spectroscopy and swelling studies. The maximum amount of immobilized insulin was 6.96 micorgcm(-2) and it was obtained at 200 micorgml(-1) initial insulin concentration for 60 min immobilization period. The cell culture studies which were carried out with human skin fibroblasts (HS An1) showed that, percentage of adhesion on RGD modified NWPF discs is higher than that of other surfaces. i.e., unmodified discs, polystyrene Petri dishes and insulin-immobilized discs, in serum-free culture. According to the results of growth studies, highest cell yield was obtained in the case of insulin-modified discs.
JURNAL PERTANIAN CEMARA, Nov 27, 2019
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Papers by Hilal Najim Hilal