检索结果-南通市图书馆

One-Pot Synthesis of Substituted Cyclohexanes from Condensation of Aldehyde and Methylketone

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第4期9卷 329-332页

作者： Yin, YG Cheung, kk Wong, WT Jingzhou Teachers Coll Dept Chem Jingzhou 434100 Hubei Peoples R China Univ Hong Kong Dept Chem Hong Kong Hong Kong

Three asymmetrically substituted cyclohexanes were prepared from one-pot reactions of aldehydes and methylketones, and the products were characterized by single crystal structure analysis, NMR spectroscopy and microan... 详细信息

关键词： Michael reaction intermolecular condensation substituted cyclohexane

Supramolecular Metal Complex with Ferrocene-conjugated Macrocyclic Triaza Crown Ether as Ligand and Its Electrochemical Property

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第3期9卷 269-272页

作者： Yin, YG Cheung, kk Wong, WT Jingzhou Teachers Coll Dept Chem Jingsha 434100 Hubei Peoples R China Univ Hong Kong Dept Chem Hong Kong Peoples R China

A tetranuclear complex [Co(III)(2)(L)(2)(AcO)(2)(OH)](AcO)(2I). 4H(2)O (L = N-ferrocenylmethyl-1,4,7-triaza-cyclononane) was prepared from ligand L . HI and its crystal structure was determined. The crystal exists in P2(1)(/)a space group and its cell parameters are a = 14.285(3)Angstrom, b = 19.888(3)Angstrom, c = 19.133(3)Angstrom; beta = 109.12(2)degrees; V = 5135.8 Angstrom(3); Z = 4. Electrochemical investigation reveals that the oxidation potential of ferrocenyl group in 1 has a 0.11V-positive-shift from that of the ferrocenyl group in ***.

关键词： supermolecule ferrocene host-guest electronic interaction

SYNTHESIS　OF　4－S－（1＂－ARYL－TETRAZOLE－5＂－YL）－4－DEOXY－4＇－DEMETHYL－EPIPODOPHYLLOTOXIN　ANALOGUES

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1995年第3期6卷 197-198页

作者： Lu, kk Liu, FM Chen, YZ Lanzhou Univ Dept Chem Lanzhou 730000 Peoples R China

As continuation of our study, 6 title compouds were synthesized by con- densing 1-aryl-5-mercapto-tetrazoles with 4'-demethyl-epipodophyllotoxin in the presence of CF3COOH(TFA).

关键词：

Relevance of adenosine deaminase as a marker for tuberculous pleural effusion in developing countries

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2009年第1期2卷 45-48页

作者： Rishad A Patil BS Das kk Department of Medicine Al-Ameen Medical CollegeBijapur-586108KarnatakaIndia Department of Physiology Al-Ameen Medical CollegeBijapur-586108KarnatakaIndia

Objective:Relevance of estimation of pleural adenosine deaminase(PADA) and serum adenosine deaminase (SADA) levels in-pleural effusion especially in cases of lymphocytic predominant exudative tubercular effusions. Methods:Fifty patients(33 male and 17 female;age:44.12±11.51 years) with pleural effusions were selected to assay adenosine deaminase(ADA) activity in pleural fluid and serum in adjunct to pleural fluid *** were individually classified as transudates or exudates after careful evaluation of all the biochemical parameters of pleural fluid and serum of patients and on the basis of Lights *** value for PADA was taken as 60U/L and that for pleural/serum ADA ratio(P/S ADA) was ***:Fourty -three patients had exudative effusions among which 38 patients had tuberculous pleural effusions and 5 had nontubercular effusions.7 cases were *** PADA levels in tubercular group(78.95±25.32 U/ L) were found to be much higher P=0.0000) than nontubercular(23.00±5.22 U/L) *** levels in tubercular group(31.05±6.42 U/L) were significantly higher(P=0.0000)as compared to nontubercular group(15.58±8.35 U/L).PADA cutoff at 60 U/L yielded sensitivity *** of 81.5%and 100%respectively,whereas P/S ADA ratio at 1.8 gave sensitivity and specificity of 84.2% and 75%respectively. A positive correlation(r=0.507,P= 0.001 1)between PADA and SADA was found in tubercular group but no such correlation(r=0.302,P=0.3407)was observed in nontubercular ***: The measurement of ADA in tubercular pleural effusions has not only relevance but also a high diagnostic utility when other clinical and laboratory tests are either negative or confusing.

关键词： Adenosine deaminase(ADA) Pleural adenosine deaminase(PADA) Tubercular pleural effusion P/S ADA ratio

Increased expression of the nitric oxide synthase gene and protein in corpus cavernosum by repeated dosing of udenafil in a rat model of chemical diabetogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2009年第4期11卷 435-442页

作者： GJ Ahn HK Chung CH Lee kk Kang BO Ahn Research Laboratory Dong-A Pharmaceutical Company Kiheung Yongin Kyunggi 446-905 Korea

Erectile dysfunction （ED） is a major complication of diabetes mellitus （DM）. This study investigates the relationship between ED and the downregulation of constitutive nitric oxide synthase （cNOS） in the corpus cavernosum （CC） of diabetic rats. It also examines the effects of udenafil, a phosphodiesterase type 5 （PDE5） inhibitor, on ED and cNOS expression levels. After 16 weeks of daily oral treatment with udenafil in diabetic rats, the intracavernous pressure/mean arterial pressure （ICP/MAP） ratio was recorded to measure erectile function, and cNOS expression was measured using reverse transcriptase （RT）-PCR and immunoblots. Although the ICP/ MAP ratio and the expression levels of endothelial NOS （eNOS） and neuronal NOS （nNOS） in the CC were markedly decreased in diabetic rats, long-term udenafil treatment improved the erectile function and increased cNOS expression compared with diabetic controls. These findings suggest that ED in DM is closely related to decreased cNOS expression in the CC and that udenafil has the ability to compensate for this pathological change by modulating cNOS expression. Udenafil also has an inhibitory role in cyclic guanosine monophosphate （cGMP） degradation.

关键词： cNOS diabetes mellitus erectile dysfunction udenafil

Influence of a-tocopherol on nickel induced alteration of serum lipid profile in male albino rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2008年第1期1卷 14-18页

作者： Gupta AD Dhundasi SA Dhara PC Das kk Department of Physiology Al-Ameen Medical CollegeBijapur 586108 KarnatakaIndia Department of Human Physiology & Community Health Vidyasagar UniversityMidnapur(West) 721102West BengalIndia

We studied the effect of the simultaneous treatment withα-tocopherol(100 mg / kg;im) and nickel sulfate (20 mg/kg,ip) on nickel-induced changes in serum lipid ***-treated rats showed a significant increase in serum LDL cholesterol,total cholesterol,triglycerides,and a significant decrease in serum HDL cholesterol. Simultaneous administration ofα-tocopherol with nickel sulfate improved LDL-cholesterol and HDLcholesterol level when compared with rats receiving nickel sulfate *** results indicate thatα-tocopherol is beneficial in preventing nickel-induced lipid profile alterations.

关键词： nickel sulfate α-tocopherol serum lipid profile

Aquatic fungal diversity in two freshwater ecosystems of Madhya Pradesh,India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Studies in Fungi 2021年第1期6卷 116-137页

作者： Mehboob A Ganie AH Dar AR Soni kk Rani Durgawati Vishwavidyalaya Jabalpur M.P-India Departments of Botany University of KashmirKargil CampusIndia Govt Degree College Bemina J&K-India Forest Pathology Division Tropical Forest Research Institute Jabalpur M.P-India

Aquatic fungi play an important role in litter decomposition in aquatic *** in view the importance of aquatic fungi,diversity of these organisms was studied in two freshwater ecosystems of Gaur River and Khurji Nala Jabalpur Madhya Pradesh *** the present study,34 fungal species and 6 chromista species have been recorded on decomposing *** number of fungal genera were recorded in submerged litter samples of Tectona grandis followed by Dendroclamus *** maximum percentage frequencies of various fungal species which colonize litter of different tree species were also *** cluster analysis revealed that different fungal communities on various plant hosts vary significantly.

关键词： Colonization decomposing substrate fruits litter mixed twigs

Fabrication of graphene oxide decorated with poly(dimethyl amino ethyl methacrylate) brush for efficient Cr(Ⅵ) adsorption from aqueous solution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第9期73卷 51-61页

作者： Alireza Nouri Siew Fen Chua Ebrahim Mahmoudi abdul Wahab Mohammad Wei Lun Ang Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Centre for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates

Confronting the severe health threats and environmental impacts of Cr(Ⅵ) in aquatic environments demands innovative and effective remediation approaches. In this study, Graphene oxide(GO)-decorated poly(dimethyl amino ethyl methacrylate)(PDMAEMA) brush nanocomposites(GOP1, GOP2, GOP3, and GOP4) were fabricated using atom transfer radical polymerization(ATRP) by the “graft from” *** resulting nanocomposites were utilized for removing Cr(Ⅵ) with good adsorption performance due to the electrostatic interaction of protonated nitrogen groups in the brush chains with negatively charged particles in the solution. The kinetic model of pseudo-second-order best represented the contaminants' adsorption characteristics. The Weber-Morris model further indicated that surface adsorption and intraparticle diffusion mechanisms primarily controlled the adsorption procedure. Additionally, the Langmuir and Temkin isotherm models were found to most accurately represent the adsorption characteristics of the pollutants on the nanocomposites, and GOP4 can achieve the maximum adsorption capacity of 164.4 mg·g^(-1). The adsorbents' capacity maintains above 85% after five cycles of adsorption-desorption. The nanocomposites in this study demonstrate promising potential for eliminating Cr(Ⅵ) from aqueous solutions.

关键词： Graphene oxide PDMAEMA brush Polymerization Nanoparticles Adsorption Chromium

在线全文

学校读者我要写书评

暂无评论

DVDrip全攻略（上）

微型计算机 2003年第12期23卷 101-107页

作者： kk

随着宽带网日趋普及，没有DVD播放设备的朋友终于也能在电脑上欣赏到接近DVD品质的影片了．这一切都要归功于DVDrip技术的产生，在电脑上播放影视是一件很简单的事，但你是否碰到过“从网上下载的电影不能播放”、“播放时有画面却没声... 详细信息

随着宽带网日趋普及，没有DVD播放设备的朋友终于也能在电脑上欣赏到接近DVD品质的影片了．这一切都要归功于DVDrip技术的产生，在电脑上播放影视是一件很简单的事，但你是否碰到过“从网上下载的电影不能播放”、“播放时有画面却没声音”、“观看时没有字幕”或“播放5分钟后自动退出”等问题呢?本文就助你玩转DVDrip。

关键词： DVDrip 视频处理字幕文件视频解码音频解码多媒体播放器