“一带一路”背景下陕西茶叶跨境电商发展路径研究

陕西作为丝绸之路的发源地，以其有利的自然生态条件和区域产业结构，形成了以茶叶为主导的产业发展格局。目前，陕西省茶叶出口规模不大，市场占有率较低。在“一带一路”倡议的推动下，陕西省茶叶出口至沿线国家的潜力较大，未来将逐步呈上升态势。研究了“一带一路”背景下陕西茶叶跨境电商市场发展现状和存在的问题，提出陕西茶叶跨境电商发展路径，通过借力跨境电商平台、开拓国际市场、稳固绿茶品牌、布局海外仓解决出口难的问题，以及完善跨境电商法律秩序，拓展陕西茶叶跨境电商发展路径。      

京津冀一次区域性暴雨特征分析

利用FNL再分析资料、卫星资料和自动站资料对2019年7月22~23日京津冀一次区域性暴雨过程进行了环流形势、卫星云图、动热力结构的分析。结果表明:此次暴雨发生在500hPa两槽一脊、副热带高压北抬、低空急流的大尺度环流背景下。西南方向的水汽输送和黄渤海的补充水汽为暴雨提供了良好的水汽条件,在河北中部的水汽辐合抬升则为暴雨提供了抬升条件。此次暴雨的产生受中尺度对流云团的连续生成合并影响,降水效率高。在暴雨中心整层表现为低层辐合、高层辐散,上升速度中心明显,使得高层的抽吸作用更强,更有利于上升运动的维持与发展,为降水强度增大提供了有力的动力条件,高空弱冷空气的入侵对能量锋区不稳定能量的释放起到了触发作用。     

Theileria parva: the immune status of calves born of dams immunised against East Coast fever

Eight Friesian cross cows three months pregnant to a single Friesian bull were immunised against East Coast fever by infection with Theileria parva (Muguga) sporozoite stabilate and treatment with pyrrolidino-methyl tetracycline. They were challenged with the homologous stock four times before calving and a fifth time after calving, and resisted all five challenges which killed all of the five groups of five susceptible controls. Calves born to these hyperimmunised dams were fully susceptible on challenge with the same stabilate, as were susceptible cows from the same farm and their calves. In both instances the calves died three to seven days earlier than the cows which were approximately 10 times heavier. These results show that one- to two-month-old taurine calves from artificially immunised dams are not protected from experimental T parva sporozoite challenge and that there is no inherent calfhood resistance to East Coast fever.     

兔病毒性出血症病毒高免血清的制备与应用效果

以兔病毒性出血症病毒组织灭活疫苗免疫家兔，经五次免疫之后，抗体效价可达12log2以上，采集兔血清，以此治疗攻毒兔，结果大部分兔都存活，临床应用效果表明：以此血清治疗自然感染兔病毒性出血症病毒的发病兔，治愈率达80％以上。     

Preductal aortic coarctation and patent ductus arteriosus in a Sumatran tiger (Panthera tigris sumatrae) cub.

Preductal aortic coarctation and patent ductus arteriosus are described in a neonatal Sumatran tiger, Panthera tigris sumatrae. Eight days postpartum, the cub appeared weak, and it was separated from the dam for hand rearing. On examination it was dehydrated and hypothermic. Despite treatment, the animal's condition worsened and the cub died 12 days postpartum. Gross postmortem and histologic examinations revealed a preductal aortic coarctation and patent ductus arteriosus with a patent foramen ovale and moderate dilatation of the right ventricle of the heart. Focal pneumonia and mild hepatitis were also present; however, diffuse pulmonary congestion and edema were considered to be the proximate cause of death.     

城市拆迁空地对城市绿化率的影响

近年来,我国城市建设发展迅速,产生了大量的拆迁空地,就拆迁空地对城市绿化率的影响进行了定量的研究,并提出相应的对策。     

通过病毒分离鉴定和基因检测首次发现虎流感

应用F81猫肾传代细胞，从高热、拒食和间有神经症状的死亡率病科中分离获得1株病毒，经形态学、理化学、生物学和血清学系统鉴定，证明为流感病毒。采用流感病毒核蛋白基因引物，对分离病毒及该虎病科进行RT－PCR扩增和序列分析，结果从分离病毒和虎病科中均扩增出与理论值大小相符的464bp基因片段；其序列与A、B、C3型流感病毒相比较，同源性分别为84．9％、35．0％、24．8％。由此说明，所分离病毒为A型流感病毒，命名为/蘧／哈尔滨（中国）／01／2002。用此分离病毒静脉接种于3月龄家猫3号，均出现与病虎相似的临床症状，其中1号耐过，2只死亡。死亡猫剖检变化与死虎相似，主要是呈肺炎病变，并可从病科中回收到所接种病毒。从此分离病毒为HA抗原，进行虎与猫血清的HI抗体检测，结果康复虎血清比其病初血清、康复猫血清比其接种前血清HI抗体均增高4倍以上，表明该病毒具有致病性，是引起该虎与试验猫发病甚至死亡的病原。     

Primary sulfates in atmospheric sulfates: estimation by oxygen isotope ratio measurements

The relative amounts of primary and secondary sulfates in atmospheric aerosols and precipitation can be estimated from measurements of the stable oxygen isotope ratios. The oxygen-18 content of sulfates formed in power plant stack gases before emission into the atmosphere is significantly higher than that of sulfates formed from sulfur dioxide after emission. Results show that 20 to 30 percent of the sulfates in rain and snow at Argonne, Illinois, are of primary origin.     

The half-life of bovine (incomplete) antibodies to Brucella abortus.

The half-life of bovine immunoglobulins was established in a group of 60 calves suckled on non-infected dams immunised with antigens to Brucella abortus. The half-life of the "incomplete antibody" as determined by the anti-bovine globulin test was 20.9 days. Up to 45 days, the mean half-life of antibodies in the calves was 17.1 days; from 46 to 99 days it was 21.1 days and for periods exceeding 100 days it was 24.4 days. In 39 calves born of and suckled on infected dams the mean half-life of antibodies was 22.4 days. Up to 100 days the figure was 19.5 days; over 100 days it was 22.8 days. There was no significant difference in the mean half-life of antibody between calves from infected and non-infected dams. In both cases the antibodies appear to be catabolised at a progressively slower rate.