To fix or not to fix: the role of 2-phenoxyethanol in rabbit,Oryctolagus cuniculus,chin gland secretion

The European rabbit (Oryctolagus cuniculus) uses the secretion of the chin gland to maintain dominance hierarchies in the wild. Recent work has investigated changes in the secretion when social status is manipulated in the rabbit. When a rabbit becomes dominant, a new compound appears in his secretion, 2-phenoxyethanol. This compound is used as a fixative in the perfume industry. This study investigates whether the compound performs a similar function in the secretion of the rabbit. 2-Phenoxyethanol is not detected olfactorially by rabbits, and slows the release rate of some of the compounds that occur naturally in rabbit chin gland secretion. We suggest that when a rabbit becomes dominant, he adds a fixative to his secretion so that his scent will persist in the environment and not dissipate. He will thus come to dominate the olfactory environment, in much the same way as he does the physical environment.     

新型阳离子固着剂的特性及其在彩喷纸中的应用

研究新型的高聚合度聚胺类阳离子固着剂对SiO2分散液及彩喷纸涂料黏度、沉降性能以及对彩喷纸图像打印质量、涂层防水性、白度等方面的影响因素,并与普通阳离子固着剂做比较。结果表明:高聚合度聚胺类阳离子固着剂能够明显降低SiO2分散液黏度;在一定添加量下,能降低涂料黏度,但随着用量增加,其黏度又会逐渐增加;高聚合度聚胺类阳离子固着剂能够防止SiO2分散液及涂料快速沉降;提高图像打印质量以及图像防水性以及在涂料中的添加用量,且成本低廉。     

Extraction of substances during glutaraldehyde fixation of plant cells

Extraction of Ca, Mg, reducing sugars, amino acids and protein was monitored during fixation of bean leaves. Fixatives included 0.5–5% glutaraldehyde in water at pH 3.4 and at pH 7.2 and phosphate, citrate, Na-cacodylate, tris, glycyleglycine, collidine and four ‘Good’ buffers, all with 2.5% glutaraldehyde. Least extraction was found in phosphate buffered glutaraldehyde. The optimal glutaraldehyde concentration is 2–3%. This causes least extraction of substances.     

适合光镜和电镜诊断肾小球疾病的固定剂选择

目的：为了使已经石蜡包埋的肾穿组织脱蜡后进行电镜观察,关键是选择适当的固定剂。方法：在石蜡包埋前,肾穿组织分别用甲醛、戊二醛及戊二醛、锇酸双固定。根据光镜和电镜观察结果,选择能兼顾光镜和电镜的固定剂。结果：甲醛固定不能有效保存肾穿组织的超微结构,锇酸的固定能有效地保存超微结构,但严重影响了光镜切片的染色;而戊二醛与甲醛相比,较好地保存了肾穿组织的超微结构,同时又不影响光镜切片的染色。结论：在石蜡包     

纳米固色剂Tinokin VG在灯芯绒上的应用探讨

由于灯芯绒产品的特殊性(色泽深浓色多,绒面使摩擦系数增大),灯芯绒织物的摩擦牢度难以提高到较满意的程度。使用Tinokin VG30～40g/L进行浸轧、烘干、焙烘后,可使硫化染料染色的黑色灯芯绒的干、湿摩擦牢度从1～2级和1级分别提高至4级和3级;使活性染料染色的咖啡色及黑色灯芯绒的干、湿摩擦牢度从2级和1～2级分别提高至4级和3级。     

剁辣椒无硫护色工艺的研究

剁辣椒在加工和贮藏中容易发生褐变,导致品质降低。为寻找能够替代亚硫酸盐的护色剂,达到更高的食品安全要求,本实验研究了柠檬酸、异抗坏血酸钠、EDTA-2Na对剁辣椒的护色效果。通过单因素和正交实验得出三种护色剂的复合护色效果明显优于单种护色剂的护色效果,最佳无硫护色剂的组合为柠檬酸0.20%,异抗坏血酸钠0.40%,EDTA-2Na 0.02%。实验所得剁辣椒色泽鲜红,基本无褐变现象,并且口感鲜脆,酸度适中,风味浓郁。     

电机冲片模具凸模固定新方法

用一种新型的凸模固定方法来代替环氧树脂、低溶点合金浇固。以获得强度更高,位置精度更高,维修更快的理想模具。     

樟木脂素和芳樟叶浸膏的定香作用

通过试验确定樟木脂素和纯种芳樟叶浸膏在香精中的定香作用。同时列举了几个含樟木脂素和纯种芳樟叶浸膏的香精及定香基的配方。     

不同固定剂对铀尾矿库中铀稳定效果的试验研究

利用壳聚糖、凹凸棒土、还原铁粉和羟基磷灰石4种固定剂对铀尾矿库中的铀进行固定化处理,通过逐级化学提取法和毒性浸出试验（TCLP）研究了铀尾矿库中铀的形态分布特征与浸出特性。结果表明：固定剂对铀的形态分布的影响存在显著差异,壳聚糖、凹凸棒土和还原铁粉掺杂后主要促进可交换态（包括水溶态）铀向其他较稳定结合态铀转化,羟基磷灰石掺杂显著提高了残渣态铀的含量。固定能力强弱依次为：羟基磷灰石>还原铁粉>凹凸棒土>壳聚糖。TCLP结果表明：壳聚糖增强了铀的活性,浸出量增加4%~23%;羟基磷灰石降低铀的浸出量近80%,是铀尾矿库中铀稳定效果较好的一种固定剂。     

无醛固色剂LXH的研制与应用

介绍一种新型的无醛固色剂LXH的合成方法,确定其合成的最佳工艺条件以及应用的情况。