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- 저자 : Asker, Kahtan A. (검색결과 4 건)
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Fatma Abdelghaffar,Manal G. Mahmoud,Mohsen S. Asker,Sahar S. Mohamed 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
Linen fabrics, one of the oldest natural cellulose fabrics, lack the functional properties for the medicalgarments that can be acquired using the green synthesis of silver nanoparticles. Therefore, the currentstudy presents a statistical design for one-pot green synthesis of silver nanoparticles (AgNPs) under UVlight using the natural polysaccharide (BSEPS) produced by Bacillus subtilis sp. suppress. The Taguchimethod was used to evaluate the optimal green synthesis of AgNPs, and obtain smaller nanoparticlessizes, by three effective factors, AgNO3 concentration, BSEPS concentration, and pH. In addition, thedeposition of AgNPs capped with BSEPS was investigated onto linen to promote antibacterial activity,functional surface properties, and dyeability. FTIR, XRD, TEM, SEM, and EDX have confirmed thefabrication and deposition of AgNPs on linen fabrics. BSEPS/AgNPs fabricating shows positive results forantibacterial activities against E. coli and S. aureus for linen fabrics, both undyed and dyed. The resultsrevealed that BSEPS/AgNPs played a dual role in reducing bacterial activity and increasing dyeability.
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Hoda E. Mohamed,Mervat E. Asker,Nahla S. Kotb,Akram M. El Habab 대한혈액학회 2020 Blood Research Vol.55 No.1
BackgroundFetal bovine serum (FBS) has been used to support the growth and proliferation of mam-malian cells for decades. Owing to several risk factors associated with FBS, several trials have been conducted to evaluate substitutes to FBS with the same efficiency and the lower risk issues.MethodsIn this study, human platelet lysate (HPL) derived from activated human platelets was evaluated as an alternative to FBS due to the associated risk factors. To evaluate the effi-ciency of the preparation process, platelet count was performed before and after activation. The concentrations of several growth factors and proteins were measured to investigate HPL efficiency. HPL stability was studied at regular intervals, and optimal hep-arin concentration required to prevent gel formation in various media was determined. The biological activity of HPL and FBS was compared by evaluating the growth perform-ance of Vero and Hep-2 cell lines.ResultsResult of platelet count assay revealed the efficiency of HPL preparation process. Growth factor concentrations in HPL were significantly higher than those in FBS, while the protein content of HPL was lower than that of FBS. Stability study data showed that the prepared HPL was stable for up to 15 months at -20oC. Ideal heparin concentration to be used in different media was dependent on calcium concentration. Results of cell viability assay showed that HPL was superior to FBS in supporting the growth and proliferation of Vero and Hep-2 cells. ConclusionThe HPL prepared by the mechanical activation of platelets may serve as an efficient alter-native to FBS in cell culture process.
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Serkan Akdag,Aytac Akyol,Huseyin Altug Cakmak,Hulya Gunbatar,Muntecep Asker,Naci Babat,Aydin Rodi Tosu,Mehmet Yaman,Hasan Ali Gumrukcuoglu 대한심장학회 2015 Korean Circulation Journal Vol.45 No.6
Background and Objectives: Obstructive sleep apnea syndrome (OSAS) is associated with increased arterial stiffness and cardiovascularcomplications. The objective of this study was to assess whether the color M-mode-derived propagation velocity of the descendingthoracic aorta (aortic velocity propagation, AVP) was an echocardiographic marker for arterial stiffness in OSAS. Subjects and Methods: : The study population included 116 patients with OSAS and 90 age and gender-matched control subjects. Thepatients with OSAS were categorized according to their apnea hypopnea index (AHI) as follows: mild to moderate degree (AHI 5-30) andsevere degree (AHI≥30). Aortofemoral pulse wave velocity (PWV), carotid intima-media thickness (CIMT), brachial artery flow-mediateddilatation (FMD), and AVP were measured to assess arterial stiffness. Results: AVP and FMD were significantly decreased in patients with OSAS compared to controls (p<0.001). PWV and CIMT were increasedin the OSAS group compared to controls (p<0.001). Moreover, AVP and FMD were significantly decreased in the severe OSAS groupcompared to the mild to moderate OSAS group (p<0.001). PWV and CIMT were significantly increased in the severe group compared tothe mild to moderate group (p<0.001). AVP was significantly positively correlated with FMD (r=0.564, p<0.001). However, it was found tobe significantly inversely related to PWV (r=-0.580, p<0.001) and CIMT (r=-0.251, p<0.001). Conclusion: The measurement of AVP is a novel and practical echocardiographic method, which may be used to identify arterial stiffnessin OSAS
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Al-Rubaie, Ali Z.,Al-Mudhaffar, Dhafir M. H.,Al-Mowali, Ali H.,Asker, Kahtan A. Korean Chemical Society 2009 대한화학회지 Vol.53 No.5
Dicyclohexyl telluride was obtained in a high yield by the reaction of cyclohexyl bromide with NaTeH(prepared in situ) in an aqueous ethanolic solution. A series of new organotelluronium salts of the general formula ${(cyclo-C_6H_11)}_2Te(R)X$ (where R = $CH_3$, X = I (1); R = $C_2H_5$, X = Br(2); R = $C_2H_5$, X = I (3); R = C_3H_5$, X = Br (4)) were prepared by the reaction of ${(cyclo-C_6H_11)}_2Te$ with the corresponding alkyl halide. Reaction of 1 with NaBPh4 gave compound 5 ( i.e. R = CH3, X = BPh4 ?) in 78% yield. Reaction of ${(cyclo-C_6H_11)}_2Te$ with benzyl bromide and 4-bromophenacyl bromide gave unexpectedly dibenzylcyclohexyltelluronium bromide (6) and bis(4-bromophenacyl)cyclohexyltelluronium bromide (7), respectively. Reaction of 6 with NaBPh4 gave the corresponding tetraphenylborate derivative (8) in high yield. $^1H$ NMR studies revealed that in $CDCl_3$solution compound 1 eliminated alkyl halide. Conductivity, IR, $^1H\;and\;^{13}C$ NMR and thermal data for the new compounds are presented and discussed. 디시클로헥실 텔루르염은 에탄올 수용액에서 NaTeH와 디시클로헥실 브롬화물의 반응에 의해 높은 수율로 얻어진다. 일반식 ${(cyclo-C_6H_11)}_2Te(R)X$ (where R = $CH_3$, X = I (1); R = $C_2H_5$, X = Br(2); R = $C_2H_5$, X = I (3); R = C_3H_5$, X = Br (4)) 인 유기텔루로늄의 새로운 시리즈는 그에 상응하는 알킬 할로겐화물과 ${(cyclo-C_6H_11)}_2Te$의 반응에 의해 만들어진다. $NaBPh_4$와 1의 반응은 78% 수율로 화합물 5를 제공하였다. 벤질 브롬화물과 ${(cyclo-C_6H_11)}_2Te$, 4-bromophenacyl bromide의 반응에서는 뜻밖에 각각dibenzylcyclohexyltelluronium 브롬화물과 and bis(4-bromophenacyl)cyclohexyltelluronium bromide을 얻었다. 높은 수율의 tetraphenylborate 유도체는 $NaBPh_4$과 6의 반응으로 얻었다. $CDCl_3$용매에서 $^1H$ NMR분석을 통해 화합물 1 이 알킬 할로겐화물의 제거 반응을 일으킴을 확인할 수 있었다. 새로운 화합물은 전도성, IR, $^1H$와$^{13}C$ NMR, 열분석를 통해 규명되었다.
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