期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
氨基嘧啶烷磺酸衍生物的合成及其抗病毒活性的研究
1
作者 黄以诚 陈志明 《贵州大学学报(自然科学版)》 1990年第4期244-246,共3页
本文提供合成3-(2.6—二氯—4一氨基嘧啶基)一丙烷-1-磺酸的方法,以氰基乙酸乙酯与尿素为原料进行缩合,再经氯化与烷磺酸化而得。所得化合物具性质稳定、水溶性好的优点。经细胞试验与动物试验证明了它具抗单纯疱疹病毒、牛痘苗病毒、... 本文提供合成3-(2.6—二氯—4一氨基嘧啶基)一丙烷-1-磺酸的方法,以氰基乙酸乙酯与尿素为原料进行缩合,再经氯化与烷磺酸化而得。所得化合物具性质稳定、水溶性好的优点。经细胞试验与动物试验证明了它具抗单纯疱疹病毒、牛痘苗病毒、腺病毒8型等的活性。其抑毒活性与三氮唑核苷及无环乌苷相近。 展开更多
关键词 抗病毒药 疱疹 氨基嘧啶 烷磺酸化
下载PDF
Alkanesulfonate monooxygenase SsuD and its chemicalbiomimetic system
2
作者 汪晓平 《International English Education Research》 2014年第6期65-70,共6页
Atkanesulfonate monooxygenase SsuD facilitates the desulfonation reaction of alkane sulfonates to release sulfite and corresponding aldehydes/ketones. Oxygen is activated by the reduced flavin. One oxygen atom is to f... Atkanesulfonate monooxygenase SsuD facilitates the desulfonation reaction of alkane sulfonates to release sulfite and corresponding aldehydes/ketones. Oxygen is activated by the reduced flavin. One oxygen atom is to fi'om water and the other oxygen atom is to from aldehydes/ketones. The oxidized flavin is regenerated after water is formed. The chemical biomimetic system was established according to the preliminary mechanism of alkanesulfonate monooxygenase and the cyclic mechanism was proposed for the formation ofaldehydes/ketones. Two oxygen atoms from the reduced flavin to form C(4a)-peroxy-flavin. The oxygen atom connected with C(4a) abstracts one electron from the neighbouring oxygen to transfer one oxygen atom to C1 ofalkanesulfonates and abstracts one hydrogen from C1 ofalkanesulfonates to break C 1-H bond. Hydroxy-flavin was produced by the above cyclic mechanism. Alkansulfonate monooxygenase SsuD does not directly involve in the reaction. It only supplies some comfortable environment to facilitate the target reactiorL 展开更多
关键词 SsuD cyclic mechanism electron transfer alkanesulfonate MONOOXYGENASE
下载PDF
Kinetic Rate Constant of Liquid Drainage from Colloidal Gas Aphrons 被引量:3
3
作者 罗建洪 李军 +1 位作者 黄平 黄美英 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第6期955-959,共5页
A kinetic model fitted by the empirical equation has been proposed to describe the liquid drainage behavior. Rate constants (kd) of liquid drainage equation could be obtained from the above empirical equation. In th... A kinetic model fitted by the empirical equation has been proposed to describe the liquid drainage behavior. Rate constants (kd) of liquid drainage equation could be obtained from the above empirical equation. In this paper, the stability of the colloidal gas aphrons (CGAs), the effect of concentrations of sodium dodecyl benzene sulphate (SDBS), dodecyl trimethylammonium bromide (HTAB) and polyoxyethylene sorbitol anhydride monolaurate(Tween-20), temperature, stirring speed, stirring time, and various kinds of salts on the kd of liquid drainage are further investigated. The results show that the Arrhenius equation can be successfully used to describe the relation between kd arid absolute temperature (T), and concentrations of surfactants, stirring speed, stirring time and salinities also have great effect on the kd. At last, the CGAs drainage mechanism is explained from analysis of the rate of liquid drainage as a function of time. 展开更多
关键词 colloidal gas aphrons liquid drainage STABILITY rate constants
下载PDF
Investigating the potential of using acoustic frequency on the degradation of linear alkylbenzen sulfonates from aqueous solution
4
作者 DEHGHANI Mohammad Hadi MAHVI Amir Hossein +1 位作者 NAJAFPOOR Ali Asghar AZAM Kamal 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第9期1462-1468,共7页
The effectiveness of using acoustical (sonochemical) reactor for degradation of linear alkylbenzen sulfonate (LAS) from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amo... The effectiveness of using acoustical (sonochemical) reactor for degradation of linear alkylbenzen sulfonate (LAS) from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amounts in domestic and industrial wastewaters. In this study, experiments on LAS solution were performed using methylene blue active substances (MBAS) method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2, 0.5, 0.8 and 1.0 mg/L, acoustic frequency of 130 kHz, applied power of 500 W and temperature of 18℃-20℃. At the conditions involved, LAS degradation was found to increase with increasing sonochemical time. In addition, as the concentration increased, the LAS degradation rate decreased in the acoustical processor reactor. 展开更多
关键词 Acoustical reactor Linear alkylbenzen sulfonate (LAS) Acoustic frequency Treatment time Power
下载PDF
Photocatalytic Reduction of 6-Chloro-3-Nitrotoluene-4-Sulfonic Acid in Presence of Surfactants
5
作者 张天永 史慧贤 +1 位作者 扈娟 杨秋生 《Transactions of Tianjin University》 EI CAS 2010年第3期161-166,共6页
Photocatalytic reduction of 6-chloro-3-nitrotoluene-4-sulfonic acid (CNSA) was studied in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. A mixture of CNSA, TiO2, water, additives and surfa... Photocatalytic reduction of 6-chloro-3-nitrotoluene-4-sulfonic acid (CNSA) was studied in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. A mixture of CNSA, TiO2, water, additives and surfactants was put into a quartz glass reactor with a jacket, which was irradiated with a high pressure Hg lamp in the purging of nitrogen gas. With methanol, the conversion of CNSA increased from 7.7% to 34.6%. Three surfactants significantly promoted the photocatalytic reduction conversion in reduced order of sodium dodecylbenzenesulfonate (DBS), cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS). In suspensions involving DBS and CTAB respectively, CNSA conversion increased in consistence with the adsorption ratio with methanol, but varied inversely with the adsorption ratio without methanol. But no obvious influence on the adsorption ratio was observed with or without methanol added when the SDS concentration was critical micelle concentration (cmc). The photocatalytic reduction of CNSA was enhanced in UV-irradiated TiO2 suspensions in the presence of methanol and surfactants. Methanol inhibited the recombination of photogenerated holes and electrons efficiently. Surfactants around 1 cmc led to the highest reduction conversion. 展开更多
关键词 TiO2 PHOTOCATALYSIS reduction METHANOL SURFACTANT
下载PDF
Effects of Self-purification of River Water on Laundry Wastewater
6
作者 Liya TAN Yili CHEN +4 位作者 Liuying CHEN Linghan ZENG Yujie CAI Bingbing FENG Hai WANG 《Agricultural Science & Technology》 CAS 2017年第6期1023-1028,共6页
[Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of lau... [Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of laundry wastewater on the contents of total nitrogen(TN), total phosphorus(TP), suspended solids(SS), chemical oxygen demand(COD) and linear alkylbenzene sulfonic acid(LAS) were studied in 7 rivers of Shaoxing City. [Result](1) The contents of TN, TP, SS, COD and LAS increased by 92%, 99%, 340%, 351% and 923%, respectively, at the discharging moment of laundry wastewater; and(2) the five pollutional indexes significantly decreased over time, and especially 2 h after the discharge of laundry wastewater, compared with former the discharge of laundry wastewater, the contents of TN, TP, COD and LAS increased by 6%, 11%, 9% and13%, respectively,while the contents of SS still increased by 76%, i.e., SS required a longer time to achieve self-purification. [Conclusion] Laundry wastewater has some influence on thequality of river water, and the self-purification function of river water could effectively remove pollutants. 展开更多
关键词 Laundry wastewater SELF-PURIFICATION Total nitrogen Total phosphorus Linear alkylbenzene sulphonic acid
下载PDF
Enhanced Desorption of PAHs from Manufactured Gas Plant Soils Using Different Types of Surfactants 被引量:6
7
作者 CHONG Zhong-Yi LIAO Xiao-Yong +3 位作者 YAN Xiu-Lan SUN Lu ZHAO Dan LIANG Tao 《Pedosphere》 SCIE CAS CSCD 2014年第2期209-219,共11页
Surfactant enhanced remediation is thought to be an effective method for the remediation of soils polluted with hydrophoblc organic compounds. Desorption of polycyclic aromatic hydrocarbons (PAHs) from an abandoned ... Surfactant enhanced remediation is thought to be an effective method for the remediation of soils polluted with hydrophoblc organic compounds. Desorption of polycyclic aromatic hydrocarbons (PAHs) from an abandoned manufactured gas plant (MGP) soil was evaluated using four eluting agents including Triton X-100 (TX100), sodium dodecylbenzene sulfonate (SDBS), rhamnolipid water solution (RWS) and rhamnolipid fermentation broth (RFB). The weight solubilization ratios for acenaphthene and fluorene were in the order of TX100 〉 SDBS 〉 RWS 〉 RFB. The Sm value, which indicates the maximum amounts of surfactants adsorbed in the soil, was in the order of RWS 〉 RFB 〉 SDBS 〉 TX100. By using 8 g L-1 of TX100, SDBS and RWS and 100% of RFB, the T-PAHs removal for the MGP soil contaminated with 207.86 mg T-PAHs kg-1 dry soil was 48.0%, 45.7%, 1.9%, and 8.6%, respectively, while that decreased to 41.6%, 37%, 0.38%, and 1.3% for the soil contaminated with 3494.78 mg T-PAHs kg-1 dry soil. Only 8 g L-1 TX100 could remove all types of the 16 PAHs partly in the MGP soil, and the removal efficiencies of different PAHs ranged from 13% to 77.8%. The results of this study herein provide valuable information for the selection of TX100 surfactant for remediating PAH-contaminated soils in MGP. 展开更多
关键词 adsorption polycyclic aromatic hydrocarbons REMEDIATION soil washing SOLUBILIZATION
原文传递
Genome editing in Drosophila melanogaster: from basic genome engineering to the multipurpose CRISPR-Cas9 system 被引量:5
8
作者 Xingjie Ren Kristof Holsteens +5 位作者 Haiyi Li Jin Sun Yifan Zhang Lu-Ping Liu Qingfei Liu Jian-Quan Ni 《Science China(Life Sciences)》 SCIE CAS CSCD 2017年第5期476-489,共14页
Nowadays, genome editing tools are indispensable for studying gene function in order to increase our knowledge of biochemical processes and disease mechanisms. The extensive availability of mutagenesis and transgenesi... Nowadays, genome editing tools are indispensable for studying gene function in order to increase our knowledge of biochemical processes and disease mechanisms. The extensive availability of mutagenesis and transgenesis tools make Drosophila melanogaster an excellent model organism for geneticists. Early mutagenesis tools relied on chemical or physical methods,ethyl methane sulfonate(EMS) and X-rays respectively, to randomly alter DNA at a nucleotide or chromosomal level. Since the discovery of transposable elements and the availability of the complete fly genome, specific genome editing tools, such as P-elements, zinc-finger nucleases(ZFNs) and transcription activator-like effector nucleases(TALENs), have undergone rapid development. Currently, one of the leading and most effective contemporary tools is the CRISPR-cas9 system made popular because of its low cost, effectiveness, specificity and simplicity of use. This review briefly addresses the most commonly used mutagenesis and transgenesis tools in Drosophila, followed by an in-depth review of the multipurpose CRISPR-Cas9 system and its current applications. 展开更多
关键词 genome editing Drosophila melanogaster MUTAGENESIS TRANSGENESIS CRISPR-Cas9
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部