长爪沙鼠的一些生态学资料

长爪沙鼠(Meriones unguiculatus)是荒漠草原分布较广的害鼠。夏武平(1982)、赵肯堂(1960)等对长爪沙鼠的某些生态方面进行了研究。作者从1979年5月至1980年6月在宁夏陶乐县对长爪沙鼠的数量季节变动、迁徒、繁殖、年龄组成、食性等方面进行了调查研究,现报告于后。     

AN OVERVIEW OF LARDIZABALACEAE

This overview provides a taxonomic revision of the family Lardizabalaceae. Seven genera are accepted here (Akebia, Boquila, Decaisnea, Lardizabala, Sargentodoxa, Sinofranchetia and Stauntonia); as a result of molecular and morphological data Archakebia is included in Akebia and Holboellia and Parvatia are united with Stauntonia. The number of species in the family is increased to 40, resulting from elevation of some varietal and subspecific names to species level, although it should be noted that the differences between species of Stauntonia are often minute, both morphologically and genetically, and may not warrant recognition. To facilitate identification, keys to the genera and species are provided and taxonomic discussions are given. Horticultural information and illustrations are provided for every genus.     

AN INTERPRETATION OF THE HYDRODYNAMICS OF POLLEN

The pollen grains of angiosperms are usually desiccated to some extent at the time of dispersal. Rehydration is an essential prelude to germination, and this takes place by uptake of water from the stigma after capture, water entering from the cells of the stigma surface following a water potential gradient. The passage of water into the pollen grain is regulated by the cuticle of the stigma papilla in the vicinity of the contact face, and also by the apertural mechanisms of the pollen grain exine, which act by varying the degree of exposure of the underlying pectocellulosic intine according to the degree of hydration of the grain. The sequence of events during rehydration suggests that at first the vegetative cell of the male gametophyte is without a normal plasmalemma, so that the initial dilation of the grain is followed by an interval of exudation. Thereafter, with the re-establishment of the cell membranes, the vegetative cell behaves in the manner of a normal plant cell through the period of germination.     

鲤科（Cyprinidate）鱼肠道菌群分析

对江苏大纵湖区的草鱼、白鲢、团头鲂和鲤鱼等4种鱼肠道菌群中的好氧菌或兼性厌氧菌进行分离鉴定.对每种鱼的肠道中菌群数量和种类组成进行了分析,发现在上述鱼肠道中存在哈夫尼亚菌属、致病杆菌属、气单胞菌属、柠檬酸菌属、假单胞菌属、链球菌属、葡萄球菌属等.     

AN EVALUATION OF OBSTETRICAL ANALGESIA

Relief of pain and safety of mother and child are fundamentals in obstetrical analgesia. Elimination of those drugs which are ineffective or dangerous is the best guide to proper medication. Morphine, codeine, or similar opium derivatives should be avoided as they depress fetal respiration. Barbiturates have the same fault, despite their popularity.Demerol in small dosage is safe and effective. Scopolamine yields excellent results with safety. Magnesium sulfate potentiates and reinforces the action of scopolamine and involves no danger. This combination of drugs may be used by any competent general practitioner in the home or hospital.