鼠尾藻脂溶性物质抗食物腐败菌的初步研究

采用圆形纸片法,对鼠尾藻脂溶性物质及经柱层析分离得到的不同洗脱组分进行抗食物腐败菌实验.结果表明,鼠尾藻粗脂对大肠杆菌的抑菌圈为1.25mm.乙醇洗脱组分具有较强的抗4种食物腐败菌的活性,其对枯草杆菌、大肠杆菌、金黄色葡萄球菌和假单胞杆菌的抑菌圈分别达到3.0mm,4.0mm,5.0mm,2.5mm.     

不同产区香料烟致香物质分析比较

应用气相色谱―质谱法对云南、泰国、土耳其3个产区香料烟烟叶进行致香成分测定,并着重对其有机酸含量、赖百当类降解产物、西柏烷类化合物、类胡萝卜素降解产物及其它香味物质进行比较分析.结果表明：云南香料烟致香物质主要是赖百当类、有机酸类、类西柏烷类;土耳其香料烟致香物质主要是有机酸类、酯类;泰国香料烟致香物质主要是有机酸类、赖百当类.各产区香料烟其它致香物质也表现出一定差异.     

一种噻二唑类杂环化合物抗K562肿瘤活性研究

研究噻二唑类杂环化合物对人白血病K562癌细胞的体外抗肿瘤活性筛选。方法:利用MTT法间接测定各化合物对肿瘤细胞后的生长情况,并计算出肿瘤细胞的抑制率,选择抑制率较高的化合物进行深入研究,计算其半数抑制浓度(IC50),并考察其浓度-生长率线性关系。结果:大部分化合物均显示了较好的人白血病K562癌细胞抑制活性,化合物1抑制率达92.01%,IC50为7.07×10-5mol/L,浓度-生长率R2=0.986。结论:噻二唑类杂环化合物具有较好的抗肿瘤活性。     

手性有机基团修饰的介孔分子筛MCM-41的合成

自1992年问世以来,基于介孔分子筛MCM-41的有机-无机复合材料一直是领域研究热点之一。本文按照文献方法以水玻璃为原料制备出MCM-41,并对其孔腔进行化学修饰,即通过两步反应成功引入手性化合物,(1R,2R)-(-)-1,2-环己二胺和(1R,2R)-(+)-二苯基乙二胺。并通过扫描电镜(SEM)、X射线粉末衍射(XRD)、红外光谱(IR)及元素分析等手段对所得材料进行了表征。     

有机合成光化学应用研究进展

以杂环化合物及其中间体的合成为主,对近年来光化学法合成有机化合物的应用作了简要总结,并对有机合成光化学的应用进行了展望。     

Understanding the gum dichromate process in pictorialist photographs: A literature review and technical study

Abstract

In the late 1800s, pictorialist photographers favored a diversity of photographic techniques, including the gum dichromate process. Sometimes superimposed over other photographic images such as platinum and silver prints, the gum dichromate process utilizes a light-sensitive mixture of gum arabic, pigment, and a potassium dichromate solution hand-applied onto a sheet of paper and exposed to light while in direct contact with a negative. The definitive identification of this process has proven to be a challenge due to many variations and intermingling of techniques used by photographers of this period. This research began with a search through the historic literature, followed by the creation of test samples based on historic recipes, and the X-ray fluorescence analysis of these tests. The identification of pigments and the presence of chromium have been associated with the gum dichromate or other dichromated colloid processes in the past. Research results reveal that the presence of chromium may have more complex sources, requiring a more discriminating approach and a modified protocol for the identification of gum dichromate photographs.     

镧肥对水稻香气和产量品质的影响

以桂香占、华粳籼74、品14和品15四个品种为材料,采用盆栽试验,研究了基肥施用氯化镧(LaCl3)对四种不同糙米的香气含量、产量和品质的影响。结果表明,施用LaCl3提高了四种水稻糙米的香气含量;提高了不同水稻的结实率从而增加产量;对四种不同水稻的加工品质的影响各有不同,但均降低了四种水稻的垩白粒率、垩白大小和垩白度,改善了外观品质。     

论沈曾植之词学思想——以王国维为参照对象

沈曾植虽著有以论词为主的专著《菌阁琐谈》及其他若干论词文字,但在现代词学史上,仍属于波澜不惊甚至被尘封的人物。在厘清《菌阁琐谈》一书原貌及重编情况的基础上,对其推崇晚唐五代的香弱词风,追求＂险丽＂奇诡的审美趣味做了细致的分析;对其注重词体声情搭配并从音乐的角度探索词曲演变的规律的相关论说也做了充分肯定;梳理了其与常州派代表人物周济、刘熙载等人的词学渊源。鉴于沈曾植晚年与王国维的密切交往,分析沈曾植之词学思想,时以王国维为参照对象,由此反映出新旧词学交替之际,词学思想的汇合与分途之轨迹。     

Catalytic ozonation-biological coupled processes for the treatment of industrial wastewater containing refractory chlorinated nitroaromatic compounds

A treatability study of industrial wastewater containing chlorinated nitroaromatic compounds (CNACs) by a catalytic ozonation process (COP) with a modified Mn/Co ceramic catalyst and an aerobic sequencing batch reactor (SBR) was investigated.A preliminary attempt to treat the diluted wastewater with a single SBR resulted in ineffective removal of the color,ammonia,total organic carbon (TOC) and chemical oxygen demand (COD).Next,COP was applied as a pretreatment in order to obtain a bio-compatible wastewater for SBR treatment in a second step.The effectiveness of the COP pretreatment was assessed by evaluating wastewater biodegradability enhancement (the ratio of biology oxygen demand after 5 d (BOD5) to COD),as well as monitoring the evolution of TOC,carbon oxidation state (COS),average oxidation state (AOS),color,and major pollutant concentrations with reaction time.In the COP,the catalyst preserved its catalytic properties even after 70 reuse cycles,exhibiting good durability and stability.The performance of SBR to treat COP effluent was also examined.At an organic loading rate of 2.0 kg COD/(m3·d),with hydraulic retention time (HRT)=10 h and temperature (30±2) °C,the average removal efficiencies of NH3-N,COD,BOD5,TOC,and color in a coupled COP/SBR process were about 80%,95.8%,93.8%,97.6% and 99.3%,respectively,with average effluent concentrations of 10 mg/L,128 mg/L,27.5 mg/L,25.0 mg/L,and 20 multiples,respectively,which were all consistent with the national standards for secondary discharge of industrial wastewater into a public sewerage system (GB 8978-1996).The results indicated that the coupling of COP with a biological process was proved to be a technically and economically effective method for treating industrial wastewater containing recalcitrant CNACs.     

概念整理理论视角下的汉语新复合词

上世纪80年代以Fauconnier为代表的一批美国学者,以概念隐喻为源头、空间理论为雏形提出了概念合成理论,其宗旨就是试图揭示言语意义在线构建(on-line construction)背后的那座认知冰山。汉语新复合词跟随时代的发展层出不穷,创意无限,妙趣横生,值得摸索。汉语复合词一直是语言学研究的重点。过去的研究重点是划分其与短语的界限以及对复合词出生地的定测;研究角度主要是转换生成语言学,结构分析、视点相对性等理论。所以,本文以分析大量的新汉语复合词语料库为动机,以概念整合理论为指导,旨在分析汉语复合词尤其是那些新鲜出炉的汉语复合词意义产生的过程,试图进一步增强概念整合理论对汉语的阐释力,提供一个新的识解汉语复合词的角度。