枸杞色素的提取及稳定性研究

以石油醚为提取溶剂,对新疆枸杞中色素的提取工艺进行研究．本实验得到的最佳提取工艺：固料比1：23,提取温度85℃,提取时间3h．提取的枸杞色素外观呈橙红色浸膏,在波长445nm处有最大吸收峰．研究了不同光照时间、温度、pH值、氧化剂、金属离子等对枸杞色素稳定性的影响．     

不同强度UV-B辐射胁迫对蚕豆幼苗生长及叶绿素荧光特性的影响

采用人工增强UV-B辐射的方法,研究了蚕豆幼苗生长及叶绿素荧光特性对不同强度UV-B辐射的响应.结果表明:不同强度UV-B辐射使幼苗植株矮化达50%以上,叶面积减小,干物质量减少23.3%～61.49%;可溶性糖及可溶性蛋白含量均显著降低;叶绿素含量下降,其中叶绿素a降低幅度比叶绿素b大;0.25W/m2的UV-B辐射使蚕豆幼苗叶片的Fv/Fm、Fv/F0、φPSⅡ、qP等荧光参数值显著下降.根据结果推测,增加不同强度UV-B辐射首先导致幼苗叶绿素含量减少,可溶性蛋白含量减少,进而降低PSⅡ反应中心活性,最终导致光合作用能力下降,减少了干物质的合成和积累.在本试验强度范围内,辐射强度为0.25W/m2时,其抑制作用最显著.幼苗植株的矮化及叶面积的减小是植物对增强UV-B辐射的一种适应方式.     

CuPc薄膜及其厚度对太阳电池性能的影响

酞菁铜是一种重要的有机光电半导体材料,其优异的稳定性和良好的光电性能,越来越受到人们的重视.对真空蒸发法制备的酞菁铜薄膜进行了XRD、Raman光谱、紫外 可见光谱,以研究该薄膜的结构及光学性能,并对肖特基型太阳电池ITO/CuPc/Al进行研究,通过改变CuPc的厚度,讨论其对该太阳电池电学性能的影响.     

多烷氧基取代非金属酞菁的合成及结构分析

分别以邻苯二甲酸酐和３，６－二羟基邻苯二腈为原料，经硝化、氨化、脱水、亲核取代和缩合等多步反应合成了两个系列共四个多烷氧基取代非金属酞菁化合物，对４－硝基邻苯二腈的亲核取代反应及非金属酞菁的缩合成环条件进行了探讨。其分子结构由元素分析、红外光谱和可见吸收光谱等方法确证，最大吸收波长分别为７１０ｎｍ和７７０ｎｍ，其中四取代非金属酞菁在７３２ｎｍ处有荧光发射。两个系列的酞菁衍生物均能溶于二氯甲烷、乙酸     

A survey of 3-dehydroretinal as a visual pigment chromophore in various species of crayfish and other freshwater crustaceans

Summary 3-Dehydroretinal (vitamin A₂ aldehyde) was found in the eyes of three species among 10 species of freshwater crayfish examined. Since dark-adapted eyes contained the 11-cis form of 3-dehydroretinal, this compound must be the chromophore of the visual pigment. 3-Dehydroretinal always coexisted with retinal (vitamin A₁ aldehyde), indicating the presence of a rhodopsin-porphyropsin visual pigment system.     

宝红BK的晶相研究

对宝红BK钙盐的α-、β-、γ-、δ-晶相的形成进行了研究,指出色淀化温度和干燥温度是影响晶相生成的重要因素;对α-和β-晶相在不同性质溶剂中的转相速度做了比较实验,结果表明:决定因素是它在溶剂中的溶解度,还提出了金属离子性质对颜料晶相及热性质起了重要作用。     

粘质赛氏杆菌红色素发酵培养基配方的优化

优化了粘质赛氏杆菌发酵红色素的增减偌配方，其中蛋白胨的量对色素的积累影响最参，酵母膏次之，用豆腐渣，米玉渣代替蛋白胨，酵母膏，有一定的工业应用价值。     

Accumulation of oxidized lipid-protein complexes alters phagosome maturation in retinal pigment epithelium

Lipid peroxidation has been implicated in many age-associated disorders including macular degeneration of the retina. We sought to elucidate the mechanism by which accumulation of oxidized LDL (oxLDL) reduces the ability of retinal pigment epithelium (RPE) to process photoreceptor outer segments (OS) as a model of peroxidation-induced disruption of phagocytosis. OxLDL did not reduce the lysosomal hydrolytic capacity of the RPE, but efficiently inhibited processing of various internalized proteins. OxLDL caused a delay in the acquisition of late lysosomal markers by newly formed phagosomes. At the same time, an excessive accumulation of markers of early phagosomal compartments was also observed. The activity of phosphatidylinositol 3-kinase (PI3K) was reduced in phagosomes of the RPE treated with oxLDL. These results suggest that accumulation of oxidized lipid-protein complexes in the RPE impedes phagosome maturation by blocking PI3K recruitment to the phagosomal membrane, leading to delayed processing of internalized OS.Received 24 February 2004; received after revision 12 April 2004; accepted 4 May 2004     

Interaction between tetrasulfophthalocyanines and colloidal titanium dioxide and photoelectric behavior on sensitized microporous TiO2 electrodes

Conclusion Strong interaction between sulfophthalocyanines and TiO₂ occur when the former is adsorbed on the colloidal TiO₂ surface. Upon excitation, electron transfer from excited singlet state of sulfophthalocyanine to the conduction band of TiO₂ occurs, leading to the quenching of sulfophthalocyanine fluorescence. Sensitization of the TiO₂ microporous electrode with sulfophthalocyanine extends the photoresponse of the electrode to visible and near IR region as shown by the photocurrent spectra. It is indicated that only monomeric sulfophthalocyanine plays a dominant role in the photoresponse of the electrode, while the sulfophthalocyanine aggregates give less or even no contribution to the conversion of visible light into electricity.     

Controlled assembly of copper phthalocyanine with 1-iodooctadecane

The binary assembly behavior of l-iodooctadeeane with substituted phthaloeyanine (Pc) is studied using the scanning tunneling microscopy (STM). By altering the substituted alkyl groups attached to the phthalocyanine ring, either uniform assembly or phase separation behavior can be observed. It is suggested that the strength of intermoleeular interaction between phthaloeyanine molecules is the determining factor for the assembly structure.