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One-Pot Room-Temperature Synthesis of Mg Containing MCM-41 Mesoporous Silica for Aldol Reactions

Journal of Materials Science & Technology 2018年第12期34卷 2521-2528页

作者： Shin-Ichiro Fujita Shinji Segawa Kazuki Kawashima Xuejing Nie tomoki erata Masahiko Arai Division of Applied Chemistry Faculty of EngineeringHokkaido University

One-pot synthesis of Mg containing MCM-41(Mg-MCM-41) materials was respectively carried out by a room temperature(RT) method and a hydrothermal(HT) method for aldol condensation of 4-nitrobenzaldehyde and acetone and self-condensation of acetone. The RT method can prepare MCM-41 materials containing large amounts of Mg while maintaining the structural characteristics of MCM-41 even at very low Si/Mg ratios(large Mg loadings), but the HT method cannot. The RT method can also give more active catalysts than the HT method, because the catalysts prepared by the RT method are more basic than those prepared by the HT one. The characterization indicates that Mg atoms in the Mg-MCM-41 prepared by the RT method exist as MgO disperses well on the wall surface of pores, while those in Mg-MCM-41 prepared by the HT method are included in the bulk with a smectite-like structure.

关键词： Aldol condensation Solid base catalyst Mg incorporated mesoporous silica Magic angle spinning nuclear magnetic resonance

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Protective effect of Nigella sativa oil against binge ethanolinduced oxidative stress and liver injury in rats

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Chinese Journal of Natural Medicines 2014年第7期12卷 495-499页

作者： Seval Develi Betül Evran Esra Betül Kalaz Necla Koak-Toker Gül zdemirler erata Department of Biochemistry Istanbul Medical Faculty Istanbul Universityapa 34093 Istanbul Turkey

AIM: Nigella sativa L.(Ranunculaceae) is considered as a therapeutic plant-based medicine for liver damage. In this study, the aim was to study the effect of Nigella sativa oil(NSO) pretreatment on ethanol-induced hepatotoxicity in rats. METHOD: Rats were given Nigella sativa oil at doses of 2.5 and 5.0 mL·kg-1, orally for 3 weeks, followed by oral ethanol(EtOH) administration(5 g·kg-1) every 12 h three times(binge model). RESULTS: Binge ethanol application caused significant increases in plasma transaminase activities and hepatic triglyceride and malondialdehyde(MDA) levels. It decreased hepatic glutathione(GSH) levels, but did not change vitamins E and vitamin C levels and antioxidant enzyme activities. NSO(5.0 mL·kg-1) pretreatment significantly decreased plasma transaminase activities, hepatic MDA, and triglyceride levels together with amelioration in hepatic histopathological findings. CONCLUSION: NSO pretreatment may be effective in protecting oxidative stress-induced hepatotoxicity after ethanol administration.

关键词： Nigella sativa Binge ethanol Oxidative stress Liver Rats

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Is thioredoxin reductase involved in the defense againsi DNA fragmentation in varicocele？

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Asian Journal of Andrology 2013年第4期15卷 518-522,I0009页

作者： Gill Ozdemirler erata Canan Kfiqiikgergin Giilsan Aktan Ates KadoOuI Miijdat Uysal Necla Kocak-Toker Department of Biochemistry Istanbul Medical Faculty University of Istanbul Qapa 34093 Istanbul Turkey and Department of Urology Istanbul Medical Faculty University of Istanbul ~apa 34093 Istanbul Turkey

We aimed to investigate the role of thioredoxin reductase （TR） and inducible heat shock protein 70 （iHsp70） and their relationship with sperm quality in varicocele （VAR） patients. Semen samples were obtained from 16 subfertile men diagnosed as VAR and 10 fertile men who applied to the Andrology Laboratory of Istanbul Medical Faculty of Istanbul University. The sperm TR and iHsp 70 expression levels were determined using Western blot analysis. The TR activity of the sperm was assayed spectrophometrically. The sperm quality was evaluated both by conventional sperm analysis and by a terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling （TUNEL） technique that assayed DNA-fragmented spermatozoa in semen samples. The percentage of TUNELopositive spermatozoa in the VAR group （16.3%±5.6%） was higher than that in the fertile group （5.5%±1.9%）. Significant inverse correlations were detected between the percentage of TUNEL-positive cells and both the concentration （r=--0.609; P=0.001） and motility （r=--0.550; P=-0.004） of spermatozoa. Both the TR expression and activity were increased significantly in the VAR group （U=22.0; P=0.001 and U=33.5 P=0.012, respectively） as analyzed using the Mann-Whitney UWilcoxon rank sum Wtest. Furthermore, significant positive correlations were found between TR expression and activity （r=-0.406; P=O.040） and between TR expression and the percentage of TUNEL-positive cells （r=0.665; P=-0.001）. Sperm iHsp70 expression did not differ between the VAR and fertile groups. In conclusion, increased sperm TR expression might be a defense mechanism against apoptosis in the spermatozoa of men with VAR.

关键词： DNA damage inducible heat shock protein 70 (iHsp70) thioredoxin reductase (TR) spermatozoa varicocele

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