东海南部海域头足类群落结构特征及其与环境关系

为了研究杜氏枪乌贼(Uroteuthis duvaucelii)角质颚形态和生长特征,根据2015年9—10月在南海北部海域采集的样本,通过测定样本胴长(L_M)、体质量(M)和角质颚的形态值,建立胴长与体质量以及角质颚形态参数与胴长的关系,并利用方差分析法比较不同个体和性成熟度间杜氏枪乌贼角质颚形态的差异。结果表明,不同性别未成熟个体间胴长存在显著差异(P<0.01),雌性不同成熟度个体间体质量存在显著差异(P<0.01),胴长和体质量关系符合幂函数,未成熟和性成熟个体的生长系数b分别为2.22~2.25和1.75;性成熟与未成熟个体间角质颚形态值存在显著差异(P<0.01),不同性别未成熟个体间则不存在显著差异(P>0.05);选取的6个角质颚形态参数值与胴长的关系均符合线性生长模型;通过方差分析,认为不同胴长组之间,雌性杜氏枪乌贼角质颚形态存在显著差异(P<0.01),结合性成熟度分析,发现角质颚形态参数同时受到胴长与性成熟度间交互作用的影响(P<0.01)。     

引进温室带给中国设施园艺现代化的思考

中国引进现代化温室面积已逾２００ｈｍ＾２,对中国温室业的发展起到了积极的推动和示范作用。本在回顾和总结引进温室的基础上,通过实例分析对中国未来现代化温室的发展和建设提出了一些借鉴经验,尤其在温室节能、温室管理等方面就在地制宜发展中国设施园艺工程提出了一些具体的看法。     

中国古蚕书的检索与评介

中国古代的农书中大多有蚕桑的内容,另外还有许多蚕桑专书。自汉代到清末的两千多年间,笔者查阅到蚕桑内容较多的农书有62种,桑蚕专书162种,柞蚕及其他野蚕书46种。并对《蚕桑指要》、《沂水桑麻话》、《蚕桑心悟》、《蚕桑须知》等6本稀见蚕(农)书作了评介。     

Effects of Energy,Protein and Amino Acids Levels on the Development of Mammary Gland and the Growth of Fetus in Sows at Late Gestation

Late gestation is an important period for rapid development of the sow's mammary gland and fetus. It is becoming more and more important to provide a suitable nutrient level in late gestation period for improve the reproductive efficiency of sow. Demand of energy, protein and amino acids for mammary gland and fetus in sows at late gestation are different. To provide reasonable nutrition for fetus, at the same time for the needs of mammary gland are still seldom reported. In this paper, the effects of dietary energy, protein and amino acids levels on the development of mammary gland and the growth of fetus were reviewed,the authors propose the requirement of energy, protein amino acid and reasonable proportion in sows at late gestation, in order to give some guidance for pig farmers.     

野生动物旅游产品现状初探

野生动物旅游产品在总体的旅游产品中占有很大的市场份额,也有越来越多的旅游爱好者对此拥有购买动机与欲望。根据目前旅游市场现状,本文对野生动物旅游产品的种类进行了归类,提出了野生动物旅游产品可分为观赏型、参与型、工艺品型、食用型和药用型等5种表现形式。结合中国在野生动物旅游产品方面的开发现状,从生态保护、增强体验性与真实性、社区共管、科普教育、法制建设和科学投资方面提出了合理开发的建议。     

Bursting tension of medium and large canine arteries sealed with ultrasonic energy or suture ligation

OBJECTIVE: To compare bursting tension of arteries > or =3 mm in diameter sealed with ultrasonic energy (UE) with arteries ligated with suture. STUDY DESIGN: Experimental, nested factorial design. SAMPLE POPULATION: Vascular segments from canine cadavers. METHODS: Arterial segments (12) were collected from each of 16 canine cadavers and equally divided into 2 groups based on vessel diameter (medium, 3.0- < 4.5 mm; large, 4.5 - < or =6.0 mm). Arterial specimens (3) from each group were sealed with either UE (Harmonic Scalpel, HS, power level 3) or suture ligation. The mean bursting pressure and tension were determined and compared. RESULTS: Bursting tension was significantly higher (P< .0001) for sutured arteries than UE-occluded arteries, irrespective of size. Bursting tension was significantly higher (P=.0013) for medium than large UE-occluded arteries, whereas there was no difference associated with size for ligated arteries. UE energy failed to seal 1 medium artery and 7 large arteries. Compared with normal blood pressure, bursting pressures were 3.5 times greater for sutured arteries irrespective of size, 1.8 times greater for medium UE-occluded arteries, and approached normal blood pressure for large UE-occluded arteries. CONCLUSION: At the power level tested, UE should not be used to seal arteries > 4.5 mm in diameter. Suture provided an optimal seal for arteries < or =6.0 mm in diameter. CLINICAL RELEVANCE: Use of UE to occlude arteries during laparoscopic surgery is advantageous because only 1 instrument is required to simultaneously cut and coagulate tissue, but care should be exercised where large arteries might be encountered.