黄原酯棉对痕量银吸附条件的探讨     

张然  蒋小燕 《江西地质》2001,15(3):238-240

本文通过黄原酯棉对痕量银在不同条件下的吸附试验，找出黄原酯棉对痕量银吸附的最适宜条件，为在分析化学以及环保中利用黄原酯棉分析痕量银提供参考。  相似文献   

甲壳胺人工皮—CHIMEHERB治疗不同类型创面初步结果     

李良平  娄培友  陈志伟 《中国海洋大学学报(自然科学版)》1989,(Z3)

本文报告了1989年1月至12月使用甲壳胺人工皮治疗94例不同类型创面,其中手部创伤66例,烧伤5例,其它创面17例。结果断层皮肤损伤愈合良好,小面积全层皮肤损伤愈合后有少量疤痕形成,在手外伤中,以指端损伤效果较好,采用此疗法,方法简单,易于推广。  相似文献   

The effects of fucoidans from Laminaria japonica on AAPH mediated oxidation of human low-density lipoprotein     

LI Laihao  XUE Changhu  XUE Yong  LI Zhaojie  FU Xueyan 《海洋学报(英文版)》2006,25(4):124-130

1Introduction Thegeneration,reactionandconsequenceof freeradicalsinbiologicalsystemshavereceived muchattentionrecentlyinconnectionwithavariety ofpathologicalevents(BarryandSusanna,1993;FangandLi,1999).LDLoxidizedbyexposureto tracemetalionsCu2 andFe3 (Hein…  相似文献   

溶菌酶对海洋生物高分子壳聚糖的降解研究   总被引：10，自引：1，他引：10  

周桂  黄在银  谭学才  梁致源  周萍 《海洋科学》2002,26(3):53-56

用粘度法和吸光度法 ,研究了溶菌酶非专一性降解壳聚糖过程中温度、pH、时间、酶浓度、底物浓度对溶菌酶降解壳聚糖反应速度的影响 ,确定了以壳聚糖为底物的溶菌酶的一些催化特性 :温度为60℃ ,pH值为4.0时 ,达到最大酶反应速度。0.5～4.0h内酶反应速度恒定 ;酶浓度在0.5～4U/ml范围内 ,酶反应速度与酶浓度成线性关系。米氏常数Km 为9.03×10-4 mol/L。  相似文献   

关于制备壳聚糖纤维的研究(英文)     

曾名勇 《中国海洋大学学报(自然科学版)》1993,(2)

研究壳聚糖的脱乙酰度和纺丝原液的浓度对纤维性能的影响。并对湿法纺丝设备及湿法纺丝的条件进行了初步的探索。  相似文献   

Distribution of microbial fatty acids and fatty alcohols in soils from an altitude transect of Mt. Jianfengling in Hainan,China: Implication for paleoaltimetry and paleotemperature reconstruction     

YANG Huan  DING WeiHua  XIE ShuCheng 《中国科学:地球科学(英文版)》2014,57(5):999-1012

The temperature gradient along the altitude transect of Mt.Jianfengling provides a good opportunity to establish and evaluate the microbial lipid-based environmental proxies.The soils collected from 14 different altitudes of Mt.Jianfengling contain abundant microbial fatty acids and fatty alcohols,including iso/anteiso fatty acids(i/aC12:0–i/aC19:0),10-Me-C16:0 fatty acid,iso/anteiso fatty alcohols(i/aC13–iC26),10-Me-C16:0 fatty alcohol and unsaturated fatty alcohols,which can indicate a strong microbial activity in the Jianfengling soils.The branched and unsaturated fatty alcohols can be only detected when saponification is performed,implying that these lipids are present as the constituents of bacterial wax esters in the soils.The ratio of aC15/iC15 fatty acids is positively correlated with altitude,suggesting that the decrease in temperature can induce the increase in the relative abundance of anteiso C15 fatty acid.In contrast,the ratio of aC15/iC15 fatty alcohols and of aC15/nC15 fatty alcohols both decrease with increased altitude or decreased temperature.Similarly,the ratio of nC18:1/nC18:0 fatty alcohols also decreases with decreased temperature,which is opposite to the previous observation that unsaturation of fatty acids in microorganism increases in response to decreased temperature.Besides,the average chain length(ACL)of long chain fatty alcohols(C22–C30)from leaf waxes and carbon preference index(CPI)of all n-fatty alcohols are also significantly correlated with altitude or mean annual temperature,demonstrating their potential for paleoclimate reconstruction.The correlation of microbial fatty acids and alcohols as well as ACL and CPI of plant wax-derived fatty alcohols with altitude may provide novel ways to reconstruct paleotemperature and paleoaltimetry.  相似文献   

Malachite Green Adsorption onto Chitosan Coated Bentonite Beads: Isotherms,Kinetics and Mechanism     

Wan Saime Wan Ngah  Noorul Farhana Md Ariff  Azhan Hashim  Megat Ahmad Kamal Megat Hanafiah 《洁净——土壤、空气、水》2010,38(4):394-400

The removal of Malachite green (MG) from aqueous solutions by cross‐linked chitosan coated bentonite (CCB) beads was investigated and the CCB beads were characterized by Fourier Transform Infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and X‐ray diffraction (XRD) analysis. Solubility and swelling tests were performed in order to determine the stability of the CCB beads in acidic solution, basic solution and distilled water. The amount of MG adsorbed was shown to be influenced by the initial pH of the solution, contact time and the initial MG concentration. A kinetic study indicated that a pseudo‐second‐order model agreed well with the experimental data. From the Langmuir isotherm model, the maximum adsorption capacity of MG was found to be 435.0 mg g^–1. Desorption tests were carried out at different concentrations of EDTA, H₂SO₄ and NaOH. However, all desorbing solutions showed zero recovery of MG at all concentrations.  相似文献   

Bioremediation of oil-contaminated sediments on an inter-tidal shoreline using a slow-release fertilizer and chitosan     

Xu R  Lau AN  Lim YG  Obbard JP 《Marine pollution bulletin》2005,51(8-12):1062-1070

A 95-day field trial on the bioremediation of oil in beach sediment using Osmocote and chitosan was conducted on an inter-tidal foreshore in Singapore. Osmocote was the key factor in enhancing nutrient levels in sediments, the metabolic activity of the indigenous microbial biomass, and the biodegradation of aliphatics and polycyclic aromatic hydrocarbons (PAHs) with ring number of 2 and 3. In contrast, chitosan did not enhance these parameters in the presence of Osmocote. However, the addition of chitosan to Osmocote amended sediments significantly enhanced biodegradation of recalcitrant 4–6-ring PAHs. This is most likely due to the high oil adsorbancy capacity of chitosan, which enhances the bioavailability of high ring number PAHs to the microbial biomass.  相似文献   

交酯化法制备鱼油脂肪酸乙酯的研究     

沈继红  刘发义  李光友 《海洋科学进展》2001,19(2):83-87

研究了用交酯化法制备鱼油脂肪酸乙酯的工艺 ,分析了原料鱼油的质量、催化剂NaOH和乙醇用量对乙酯化的影响。结果表明 ,原料鱼油在低酸值、低过氧化值、低水分时对乙酯化反应是有利的 ,催化剂NaOH的用量为原料鱼油的 0 .3 % ,无水乙醇的用量为原料鱼油的 60 %时是比较经济的。  相似文献