“特白丽”光学增白剂在合纤中的应用

美国伊士曼化工公司的“特白丽”ＯＢ－１光学增白剂是一种聚合物添加剂,它可以提高合成纤维的白度。 涤纶、丙纶和锦纶在添加了特白丽光学增白剂后变得更白。“特白丽”光学增白剂通常被用在涤纶短纤和长丝中,在那些对白度要求高的纺织制品中有广泛应用,如白衬衫、外套、台布、窗帘、手绢、床单、医院的白大褂和那些要求特别白的制服。荧光增白剂还可以明显改善淡色的或中性染色的织物的色光度。在美国,ＯＢ－１已代替了传统的用在涤纶中的表面增白剂,因为它具有效果好、成本低的特点。 “特白丽”光学增白剂是添加在熔化的聚合物中而…     

上海助剂厂开发成功新型涤纶用荧光增白剂S－ER

上海助剂厂开发成功新型涤纶用荧光增白剂Ｓ－ＥＲ随着聚酯纤维生产的发展，我国目前年产量已达１５０多万吨，原来用于增白的荧光增白剂ＤＴ，在质量上已不能满足聚酯纤维纺织品染整加工的要求。纺织行业渴望化工部门能开发出适应聚酯纤维发展的新型荧光增白剂，上海助剂...     

荧光增白剂的表面施加法

荧光增白剂的表面施加法刘英杰河北保定造纸工业科学研究所０７１０００关键词荧光增白剂，表面施加荧光增白剂一般被加人到纸浆中，而在生产涂布纸时．在涂料中加人荧光增白剂，其增白效果也相当明显。对此，我们进行了试验。１小试情况我们按正常的制备条件将ＶＢＬ荧光...     

新型荧光增白剂PS—1在涤棉混纺织物上的应用

新型荧光增白剂ＰＳ－１系国产荧光增白剂升级换代产品，其１，４双苯结构较之传统的Ｅ唑类结构的增白剂ＤＴ，在增白效果上具有白度高，荧光强，用量少等特点，本文对ＰＳ－１在涤棉漂白织物的应用上作了具体的试验及测试，优选了用量，焙烘温度和焙烘时间等工艺参数。生产实践证明，ＰＳ－１增白工艺操作方便，成本低，正品率高，经济效益十分显著。     

液状阳离子荧光增白剂CH的合成与应用

分析比较了ＫＣＢ、ＢＡＣ、ＮＬ等进口样的合成方法和应用性能后，选择了液状阳离子荧光增白剂ＣＨ的合成路线。采用烯酮与芳香肼缩合成染料ＣＨ，再与阳离子试剂Ｒ＾５Ｘ反应合成阳郭荧光增白剂ＣＨ－１，３－二聚代芳基吡唑类化合物。经腈纶纤维和织物的应用试验：其表面白度、荧光强度、荧光色调及各项应用性能基本达到参比样ＵｖｉｔｅｘＡＭＳ水平，还避免了ＤＣＢ等产品的易产生“黄斑”和“落粉”的弊病。     

张家港市港达染料化工厂供货信息

阳离子染料：红 Ｘ－ＧＲＬ,蓝Ｘ－ＧＲＲＬ,黄 Ｘ－ＳＧＬ,金黄Ｘ－ＧＬ,艳红ＳＧＮ,红Ｘ－ＧＴＬ,翠蓝ＧＢ,桃红ＦＧ,蓝Ｘ－ＢＬ,蓝Ｘ－ＧＲＬ。 进口活性染料：黄 ３ＲＳ,红 ３ＢＳ,红 ＢＳ,红 Ｂ,蓝Ｇ,艳蓝 ＢＢ,艳黄 ＧＬ,．黑Ｂ,．黑 Ｎ。 可拔性染料。阳离子拔色黄３ＲＬ,可拔分散黄ＰＤ－Ｇ,橙 ＰＤ－Ｒ,大红 ＰＤ－ＧＧＳ,蓝 ＰＤ－ＧＤ。藏青 ＦＤ－２ＲＤ,深棕 ＰＤ－ＢＲＳ,黑 ＰＤ－ＲＳ,ＩＰＤ－ＧＳ。 荧光增白剂;腈纶荧光增白剂ＣＨ,腈纶荧光增白剂 ＢＡＣ（瑞士）,棉用荧光增白剂 ＢＴＷ（瑞士…     

新型荧光增白剂JSS—105在棉纤维上的应用

介绍了荧光增白剂ＪＳＳ－１０５与ＶＢＬ在棉纤维应用工艺对比试验，结果显示ＪＳＳ－１０５增白剂增白效果较好，该产品适用于浸染，轧染工艺。     

双苯乙烯型涤纶荧光增白剂DT的应用工艺参数优选

介绍了传化牌双苯乙烯型涤纶荧光增白剂ＤＴ的应用工艺参数优选试验情况及其与一般ＤＴ增白剂的结果对比。试验表明，该产品的适应工艺范围和增白效果尤其是低温吸附效果等，均明显优于一般ＤＴ产品，是目前较为理想的一种新型涤纶荧光增白剂。     

PS—1涤纶荧光增白剂在涤棉混纺织物上的应用

主要对新型助剂ＰＳ－１和ＤＴ荧光增白剂进行了一系列的对比试验，找出最佳工艺配方，替代了ＤＴ荧光增白剂，提高了产品质量，降低了原料成本。     

荧光增白剂CPS-A在涤纶织物上的应用

采用荧光增白剂CPS-A对涤纶织物进行增白处理,测试荧光增白剂CPS-A在涤纶织物上的牢度与耐黄变性,研究还原法和氧化法对涤纶增白织物的剥色效果。结果表明,荧光增白剂CPS-A的最佳增白工艺:荧光增白剂CPS-A质量分数0.2%~0.6%(omf),染浴pH值偏中性,浸染温度98~130℃时,定形温度170~190℃;增白的涤纶织物具有较高的色牢度和耐黄变性;涤纶增白织物的回修剥色选择氧化法,如荧光剥除剂TF-900。     

鸡枞菌ITS区克隆、测序及其系统发育关系

采集鸡枞菌（Termitomyces）子实体,对其进行rDNA-ITS 区序列聚合酶链式反应扩增测序,利用MEGA5对rDNA-ITS不同区域作序列分析,并构建鸡枞菌转录间隔区（internal transcribed spacer,ITS）系统发育树。结果表明：在10 种鸡枞菌中,测序结果表明鸡枞菌rDNA-ITS区长度在527～661 bp。系统发育树表明,10 种鸡枞菌中,有8 种鸡枞菌各为一支,尖盾鸡枞菌与球盖白蚁伞聚为一支;待定种A1、E1、H1独为一支,可能为新种;B1、G1、D1可能为谷堆鸡枞菌;I1可能为根白蚁伞;ZZ1可能为粗柄鸡枞菌;待定种C1不能明确。结果证明,ITS1及ITS1-5.8S rDNA-ITS2可用于鸡枞菌进行种间系统发育树的建立,但ITS1区构建的鸡枞菌种间系统发育树支持率最高,ITS2区可辅助进行某些待定种的鉴定。     

Comparative study on the characterization of antisera of anti-aflatoxin B1 from rabbit and laying hen

Polyclonal antisera specific for aflatoxin B1 (AFB1) were developed in rabbits and laying hens immunized with AFB1 conjugated to bovine serum albumin (AFB1-BSA). During the immunization schedule, AFB1-specific antisera from rabbits started to obviously be secreted after 60 days of the first AFB1-BSA injection, reached to a peak at day 120, and started to go down at day 135; while in regard to laying hens, antibodies began to largely be produced at day 90, arrived to a peak at day 135, and began to go down at day 165. The rabbits consistently produced anti-AFB1 antisera in 2-fold higher amounts than the laying hens during the antisera production process. But rabbits' and laying hens' antisera to AFB1 were found not to be apparently different in cross-reaction with aflatoxin analogs. Both rabbits' and laying hens' antisera could be used as immunological reagents for detecting AFB1 in agricultural commodities.     

A vector for double epitope tagging with a recyclable marker

Multimeric protein complexes play diverse and vital roles in the cell, but following the composition of these complexes under varying growth conditions can be challenging. Toward that goal, we have designed a vector that permits the double epitope tagging of a protein at its carboxy terminus. One 'universal' tag, a triple repeat of the HA1 epitope, is fused with every protein to be studied, allowing the composition and stoichiometry of the proteins in a complex to be detected with a single antibody. Each protein also can be tagged with a second epitope specific for that protein. This 'specific' tag can be used to immunoprecipitate complexes containing that protein of interest. Any epitope to which a specific antibody is available can be used for this second tag. Because there are a limited number of selection markers for cloning in yeast, the kanamycin cassette, flanked by loxP sites, was incorporated into the vector to permit marker recycling using Cre-lox recombinase. This vector was used to tag 4 proteins involved in ribosome biogenesis-Ytm1, Cic1, Brx1 and Drs1. An anti-HA1 antibody could detect all four proteins in crude lysates and yielded the relative abundance of these four proteins, of which Drs1 is reproducibly less abundant than any of the others, which may have implications for the control of ribosome biogenesis. The Ytm1 protein was also tagged with the VSV epitope and can be specifically detected using an anti-VSV antibody. This vector may prove useful for exploring other protein complexes.     

Use of a YAP1 overexpression cassette conferring specific resistance to cerulenin and cycloheximide as an efficient selectable marker in the yeast Saccharomyces cerevisiae.

Drug-resistance markers for yeast transformation are useful because they can be applied to strains without auxotrophic mutations. However, they are susceptible to technical difficulties, namely lower transformation efficiency and the appearance of drug-resistant mutants without the marker. To avoid these problems, we have constructed a phosphoglycerate kinase (PGK) promoter-driven YAP1 expression cassette, called PGKp-YAP1. Yeast cells containing PGKp-YAP1 were resistant to cycloheximide, a protein synthesis inhibitor, and also to cerulenin, a fatty acid synthesis inhibitor, but not to other drugs tested. The transformation efficiency of PGKp-YAP1 using cerulenin selection was comparable to that using a URA3 auxotrophic marker when low concentrations of cerulenin were used. Non-transformed drug-resistant colonies did appear on the low-concentration cerulenin plates. However, these non-transformed colonies could easily be identified, based on their cycloheximide sensitivity and/or their resistance to aureobasidin A to which the transformants were sensitive. Therefore, the dual drug resistance of PGKp-YAP1 could be used as an effective selection for PGKp-YAP1 recipient cells. The PGKp-YAP1 marker was used to disrupt the LYS2 gene and to transform an industrial yeast strain, indicating that this marker can be used for efficient and reliable gene manipulations in any Saccharomyces cerevisiae strain.     

Release of 1-methylcyclopropene from heat-pressed polymer films

ABSTRACT:  Gaseous 1-methylcyclopropene (1-MCP) is an inhibitor of ethylene perception that is being used extensively for apples and ornamental products, and under intensive investigation for its potential benefits for other fruits and vegetables. 1-MCP is currently used in closed environments that maintain stable concentrations for several hours in order to be effective. However, food packaging materials that release 1-MCP at a predictable rate into the package headspace might be useful for application in inhibiting the deleterious effects of ethylene in the postharvest packaging and storage of some horticultural products. A 1-MCP/α-cyclodextrin (1-MCP–cd) complex was incorporated into several common packaging films by heat-pressing (dry-blend, lamination) and solution-casting methods. The release of 1-MCP from the films was quantified by gas chromatography with respect to time, loading of 1-MCP, temperature, relative humidity (RH), type of film, and film-forming method. Release of 1-MCP was rapid and high in films held at RH ≥ 75%. The rate of release was slow during the 1st 12 h and then increased during the next 24 to 36 h. Higher temperatures resulted in higher and faster release. A loading of 8 mg of 1-MCP–cd per 140 mg of polymer was found to be optimal. Pressing 1-MCP–cd containing films above 100 °C reduced the amount of 1-MCP remaining in the film. Incorporation into LDPE resulted in a higher and faster release than from PS, PVC, and PP polymers. 1-MCP release from a film matrix appears to be within the acceptable range for produce packaging applications.     

The effects of sex steroid hormones and interleukin-1-beta on MUC1 expression in endometrial epithelial cell lines

Oestrogen, progesterone and paracrine signals from the embryo have been associated with the overall control of implantation. Changes in the expression of the heavily glycosylated transmembrane glycoprotein MUC1 mucin on the endometrial epithelium are also thought to be important for embryo attachment. Increased MUC1 expression has been correlated with elevated progesterone levels in the secretory phase of the menstrual cycle. Embryonic control of endometrial receptivity through changes in MUC1 expression could be achieved through the interleukin-1 system. Four endometrial epithelial cell lines (HEC1A, HEC1B, Ishikawa and RL592) were treated with oestrogen and progesterone (with or without interleukin-1-beta) and were subjected to immunocytochemistry and flow cytometric analysis to determine MUC1 production using MUC1 antibodies. HEC1A (oestrogen receptor (ER) and progesterone receptor (PR) positive) and HEC1B (ER positive and PR negative) were transfected with the MUC1 promoter, underwent similar treatment regimes and the activity of the MUC1 promoter relative to their untreated controls was determined using a chloramphenicol acetyltransferase (CAT) enzyme-linked immunoassay. Using the cell lines, we determined that endometrial MUC1 expression is up-regulated by progesterone, consistent with the in vivo increases in MUC1 related to high progesterone levels. We also revealed that neither oestrogen, nor interleukin-1-beta, appear to modulate MUC1. Progesterone-dependent regulation of MUC1 is likely to be an important factor in determining endometrial receptivity.     

红外和紫外可见分光光谱法初步鉴别餐饮废油

目的建立简便、快速的餐饮废油、生物柴油以及合格食用油的鉴别检测方法。方法选择市售普通食用油、餐馆用油、生物柴油和餐饮废油(包括潲水油和煎炸老油)为研究对象,以1745 cm-1波数处的共有吸收峰为基准,比较各油脂红外光谱特征吸收峰相对强度;在230~800 nm范围内,比较各油脂的紫外可见吸收曲线,对油脂品质进行比较鉴别。结果比较红外图谱发现,各油脂在3473、3008、1652 cm-1附近对1745 cm-1的吸收峰相对强度差别较大,可以此作为判别依据;通过观察比较各油脂在紫外可见光谱图中的起始和终止吸收波长,以及在668 nm处是否有较高的吸光度或特征吸收峰,可对油脂品质进行鉴别。结论综合红外和紫外可见两种光谱方法的检测结果,本方法可初步地快速鉴别合格食用油与餐饮废油。     

Dietary exposure of Hong Kong adults to nitrate and nitrite from vegetable intake

The aim of this study was to assess the dietary exposure of adults in Hong Kong to nitrate and nitrite from vegetables. If all vegetables consumed were raw, the dietary exposure to nitrate for average consumers was estimated to be 4.4?mg?kg^?1 body weight (bw)?day^?1 and, for high consumers, was estimated to be 13?mg?kg^?1?bw?day^?1, which is about 120 and 350% of acceptable daily intake (ADI), respectively. If all vegetables consumed were cooked, the dietary exposure to nitrate from vegetables for the average adult consumer was estimated to be 3.5?mg?kg^?1?bw?day^?1 and, for high consumer, was estimated to be 10?mg?kg^?1?bw?day^?1, which is about 95 and 270% of ADI, respectively. On the other hand, the dietary exposure to nitrite from vegetables for average and high consumers were well below the ADI.     

Development of a biosensor immunoassay for the quantification of alphas1-casein in milk

An immunoassay to quantify alphas1-casein (alphas1-CN) in milk using an optical biosensor, based on surface plasmon resonance (SPR) measurement, has been developed. The assay consists of a two-step sandwich strategy, with two anti-alphas1-CN antibodies directed against each extremity of the molecule. This strategy permits only intact alphas1-CN to be quantified and not its degradation products. The calibration curve was obtained using a reference milk powder with a known alphas1-CN concentration. Analysis time per sample was less than ten minutes. The antibody-coated surface could be used for more than 150 determinations. Detection limit was established at 0.87 microg/ml and the intra- and inter-assay variation coefficients were 2.86 and 5.31%, respectively. The method was applied to raw milk to quantify intact alphas1-CN, with no pretreatment of the sample. An initial analysis of 48 milk samples permitted alphas1-CN concentrations ranging from 8.8 to 12.06 mg/ml to be obtained.