GIS在生态土地分类中的作用

This paper depicted the physiographic landscape features and natural vegetation situation of study area (the eastern Jilin Province), and expatiates the definition, basic characters and its development of Ecological Land Classification (ELC). Based on the combination of relief map, satellite photography for study area and vegetation inventory data of 480 sample sites, a 5-class and a 15-class ecological land type map was concluded according to 4 important factors including slope, aspect, vegetation and elevation. Ecological Classification System (ECS) is a method to identify, characterize, and map ecosystems. The Ecological Land Type (ELT) was examined and applied initially in eastern Jilin Province. Foundation item: This paper was supported by Chinese Academy of Sciences “100 people” project and the Open Research Station of Changbai Mountain Forest Ecosystem. Biography: XIAO Bao-ying (1974-), female, postgraduate in Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P. R. China Responsible editor: Zhu Hong     

关于做好党风廉政教育工作的几点思考

党风廉政教育在党风廉政建设和反腐败斗争中具有重要的作用。做好新形势下的党风廉政建设工作，就必须开展行之有效的党风廉政教育活动，并做到认识到位、意识突出、机制创新、措施完备、内容丰富和参与积极。     

哈密市奶牛结核病、布鲁氏杆菌病感染情况的调查

结核病与布鲁氏杆菌病都是对人体健康有严重危害的人畜共患传染病。据卫生部门统计，我国现有结核病病人近６００万人，每年因结核病死亡的约２５万人，是单一病菌引起死亡最多的传染病。仅１９９８年第三季度新疆结核病发现人数为 ４ ７９４人，由此可见，此病对人类健康有较大的威胁。而布鲁氏杆菌病同样是人畜共患的全身性传染病，且结核病和布鲁氏杆菌病的传播途径相同，由于人类的结核和畜禽结核有较强的相互交叉感染性，结合我地区实施“放心肉、放心奶”跨世纪“牧业工程”，我们于２０００年春、秋两季对哈密市郊区的５００余头奶牛…     

甲鱼健康快速养殖的几点思考

甲鱼健康养殖就是要求生产者尽量为甲鱼创造良好的生态条件，加强科学饲养管理，使其体质强壮，生长代谢机能及免疫系统正常，不用药或少用药，严禁使用对人体有损害而在鳖体内有储积残留的药物，如孔雀石绿、硝酸亚汞、激素等药物，减少甲鱼发病机率，从而使养成的商品鳖真正成为消费者心目中的“绿色食品”。 快速养殖则是指在健康养殖的前提下，缩短养殖周期，加快资金周转，以其降低成本，提高经济效益。 健康快速养鳖技术的要点： １．种苗 ①选择本地生产的品质优良的杂交种苗，避免近亲繁殖。 近年，亲鳖种质退化、近亲繁殖已成为鳖…     

Norsalsolinol uptake into secretory vesicles via vesicular monoamine transporter and its secretion by membrane depolarization or purinoceptor stimulation in PC12 cells.

The intracellular dynamics of norsalsolinol, a neurotoxin candidate causing parkinsonism-like symptoms, in PC12 cells was studied. We found that dopamine and norsalsolinol are co-localized to secretory granule layer by sucrose density gradient in norsalsolinol-treated PC12 cells. The norsalsolinol was actively taken up into isolated secretory vesicle fraction from PC12 cells with a Km value of 41.5+/-6.8 microM. The uptake of 10 microM of norsalsolinol was sensitive to reserpine (1 microM), an inhibitor of vesicular dopamine transporter, and dopamine, an endogenous substrate, but insensitive to GBR-12909, an inhibitor of dopamine transporter on plasma membrane. In norsalsolinol-treated PC12 cells, exposure to high K+ or ATP resulted in simultaneous release of norsalsolinol and dopamine. Time course of a release of dopamine and that of norsalsolinol evoked by 50 mM KCl or 100 microM ATP corresponded to each other. These releases were dependent on the concentrations of secretagogues. These data suggest that norsalsolinol is taken up with dopamine into secretory vesicle via vesicular catecholamine transporter.     

The Effect of Exogenous Hormone Treatment on Spermiation in Rhynchocypris oxycephalus (Sauvage and Dabry)

For the evaluation of hormonal control of spermiation in fish, a method to quanify the spermiation response of mature Rhynchocypris oxycephalus (Sauvage and Dabry) to hormonal therapy is described. Spermatocrit was determined after 7 min centrifugation at 18,000 ± g and sperm density was estimated by a standard hemocytomer method. Sperm density can be predicted from spermatocrit since their relationship is linear as described by the regression equation, Y = 3.68X - 27.18 ( R ² = 0.82, N = 50). where Y is spermatocrit and × is sperm density. Milt production by mature R. oxycephalus was highest at 24 h after injection of 1,000 IU human chorionic gonadotropin (HCG) and 50 μg luteinizing hormone-releasing hormone analogue (LHRHa) per kg body weight. Increased milt production coincided with low spermatocrit and sperm density levels. These results demonstrate that spermiation in mature R. oxycephalus can be reliably evaluated by a spermatocrit method and that HCG and LHRHa are effective in stimulating of spermiation in this species.     

汇率对跨国经营企业价值影响的实证分析

根据跨国经营企业价值／汇率弹性模型，得出了企业价值与汇率的函数关系；进一步，利用某些企业的实际数据，确定了这些企业价值与汇率关系式的系数，并预测了某企业未来价值的变化趋势。实证分析结果表明，跨国经营企业价值与汇率的相关性最高，其回归所得的函数具有较好的短期（一个季度内）预测效果，可以用于预测短期内跨国经营企业价值的变动。     

拮抗细菌Enterobacter cloaeae B8的一株抗菌素抗性突变体(英文)

为了研究拮抗细菌Enterobacter cloacae B8在野外水稻叶面上的定殖情况及拮抗作用,由自然选择和Tn5诱变从B8产生了一株抗菌素抗性突变体BX8.BX8能在含利福平达400μg/ml或卡那霉素达300μg/ml的LB培养基中生长.实验表明该抗菌素抗性的产生没有降低BX8的拮抗活性.该抗性比较稳定,在无抗菌素培养基中培养.BX8至少分裂生长60代内抗性不变.     

Disappearance of acetic acid from the bovine reticulorumen at basal and elevated concentrations of acetic acid.

Disappearance of acetic acid was quantified to determine whether removal of this acid from the reticulorumen is altered when ruminal acetic acid concentrations are elevated. Ruminally fistulated beef steers (n = 3 per experiment; BW = 320 +/- 9 kg) were fed eight times daily a 46% corn-based concentrate:54% mixed hay diet to meet maintenance energy requirements (3.5 kg of DM/d). In situ production of acetic acid, determined by pulsed-continuous infusion of [1-14C]acetic acid, was 530 mmol/h (CV = 12%). Disappearance from the reticulorumen (i.e., presumed absorption) was 460 mmol/h (CV = 2%) or 87% (CV = 2%) of ruminal production. Variation is described within an operational steady state. Acetic acid concentrations were increased by continuous infusion of unlabeled acetic acid into the reticulorumen. Ruminal disappearance (mmol/h) increased when this simulated production was elevated up to and exceeding in situ rates reported previously (530 to 2,700 mmol/h). These data suggest that two-thirds to three-fourths of ruminal acetate production disappeared across the reticuloruminal wall when concentration was elevated; the complement exited from the rumen with the liquid phase. The reticulorumen has an additional capacity to remove acetic acid; however, it does so with an apparent reduced efficiency at higher production rates. Liquid out-flow may affect the efficiency of reticuloruminal disappearance. Sites distal to the rumen become quantitatively important when ruminal acetic acid concentrations are increased.