猪毛制取L-胱氨酸研究(Ⅰ)—水解条件

讨论了由猪毛提取Ｌ－胱氨酸工艺中原料处理、水解时间、水解酸度、水解浴比、水解温度等对Ｌ－胱氨酸提取率的影响．     

Differential attraction of calyptrate flies (Diptera) to faeces

Adult flies may visit faeces to lay eggs or larvae, to feed, or to drink, in dry weather. Within the group of calyptrate flies without meral bristles (Muscoidea), species that breed in faeces show a significantly greater tendency to visit it than those species that breed in other media. Oestroidea (with meral bristles) do not show this tendency, ecological confirmation of the anatomical fact that calyptrates fall into at least two distinct natural groupings. Visiting faeces to drink seems unimportant for muscoids. The dung of semi-wild browsing cattle is visited by few calyptrate fly species and is only attractive for a short time.     

中国黄跗秽蝇种团一新种(双翅目:蝇科)

作者整理在四川采集的蝇科标本过程中,发现了蝇科秽蝇属一新种.     

清末民国洋行对四川猪鬃业的开发与经营

四川猪鬃产业发展始于19世纪末期。1891年,英商立德乐入川创办第一家猪鬃加工厂,开启了四川猪鬃开发的历史。外国洋行对四川猪鬃的最初开发先后经历了英商立德乐、英商隆茂、日商新利等时期。洋行对四川猪鬃业的开发,使四川猪鬃业从无到有;猪鬃外贸的迅速发展,使其成为四川对外贸易的重要商品。     

染色猪鬃的化学褪色方法

好Ｎａ２Ｓ２Ｏ４在不同条件下漂白用酸性媒介黑Ａ染色过的杂色猪鬃的根部褪色情况。根部染色剂被还原褪色后，具有天然黑猪鬃的色泽、度、强度及外观，达到仿真的目的。探讨了最佳实验条件，效果令人满意。     

An interpretation of some bristle pattern modifications caused by directional selection inDrosophila melanogaster

Summary The variations of the dorsocentral and scutellar bristle patterns founded in two bidirectionaly selected lines are discussed in terms of the Richelle and Ghysen model. The phenotype obtained through selection for bristle suppression can be accounted for by a decrease in chaetogen production. Extra bristles can be accounted for by an alteration of the response of the cells to positional information.     

Morphology and contact mechanics influence adhesive characteristics of Dung Beetle’s bristle and Gecko’s setae

Geckos(Gekko gecko)use their hairy setae to adhere on various solid surfaces and dung beetles(Copris ochus Motschulsky)use their hairy bristles to anti-adhere in sticky environments.We study why two hairy systems express a conflict in functions by using SEM,histological approaches and functional experiments.Adhesion models and various parameters were collected and analyzed.Based on the morphological data and functional experimental results carried out by natural and denatured gecko setae and beetle bristles,we first demonstrated that the stiffness along the hair is 1000 to 30000 times that perpendicular to the hair.This stiffness difference is the key factor leading to the two hairy systems' functional differences.Slope of gecko setae reduces contact stiffness,increases contact points and real contact area that results in amazing adhesive abilities.On the other hand,stiff bristles in a beetle have higher contact stiffness,which reduces the real contact area and decreases the adhesion between two contact surfaces.Deformation of gecko setae destroys the hierarchical structure,increases the contact stiffness and results in a decrease of adhesion forces.Similarly,deformation of beetle bristles destroys the erect structure of the hair,interconnects the separated bristles and thus decreases the anti-adhesive functions.These observations inspire us in designing anti-adhesive and adhesive biomimetic systems