长白落叶松地理变异与种源区的划分

通过长白落叶松种源试验的结果,揭示了长白落叶松的地理变异规律与模式。主要特点是:呈现纬向为主,经向为辅,经纬双重正向的渐变模式。影响长白落叶松地理变异的主导气候因子是温度,其次为水份。利用长白落叶松种源生长与其环境因子线性相关显著的性状,采用主分量分析方法,将长白落叶松划分成四大种源区,即白刀山种源区(编号Ⅰ)、小北湖种源区(编号Ⅱ)大石头种源区编号(Ⅲ)、和白河种源区(编号Ⅳ)。     

竹类植物花粉的生活力和自然授粉

对12种开花竹类植物花粉的败育、生活力和自然授粉进行了观察和试验研究，花药和花粉在离体后生活力保存时间较短，尤其是离体花粉的生活力在1－2h会丧失贻尽，适宜竹花粉萌发的培养液的10％蔗糖液，若再加入5ppm硼酸能明显提高花粉发芽率。篌竹和斑苦 花分别属于花药合并粘连和无花粉的二类雄性不育型，其余10个竹种的花粉中均有三种类型的败育花粉，低温、干旱等不育环境使竹花粉发育受阻，不育花粉率增高，竹花的自然授粉不良，在盛花的竹株上接受不到花粉的竹花占33．3％，在部分开花的竹株上花粉自然授粉率公10％。     

临夏州云杉苗圃病虫害及天敌调查研究

对临夏州云杉苗圃病虫害种类、分布、危害及天敌情况进行了全面调查,初步查清了临夏州云杉苗圃主要发生的病虫害种类和天敌种类,在此基础上提出了当前云杉产业中病虫害防治的主要对象。     

Pharmacokinetics of cefquinome in tilapia (Oreochromis niloticus) after a single intramuscular or intraperitoneal administration

The pharmacokinetics of cefquinome was studied in plasma after a single dose (10 mg/kg) of intramuscular (i.m.) or intraperitoneal (i.p.) administration to tilapia (Oreochromis niloticus) in freshwater at 30 °C. Ten fish per sampling point were examined after treatment. The data were fitted to two‐compartment open models following both routes of administration. The estimates of total body clearance (CL/F), volume of distribution (Vd/F), and absorption half‐life (T_1/2ka) were 0.049 and 0.037 L/h/kg, 0.41 and 0.33 L/kg, and 0.028 and 0.035 h following i.m. and i.p. administration, respectively. After i.m. injection, the elimination half‐life (T_1?2β) was calculated to be 5.81 h, the maximum plasma concentration (C_max) to be 49.40 μg/mL, the time to peak plasma cefquinome concentration (T_max) to be 0.14 h, and the area under the plasma concentration–time curve (AUC) to be 204.6 μg h/mL. Following i.p. administration, the corresponding estimates were 6.05 h, 44.39 μg/mL, 0.17 h and 267.8 μg h/mL. The minimum inhibitory concentrations of cefquinome, determined for 30 strains of Streptococcus agalactiae isolated from diseased tilapia, ranged from 0.015 to 0.12 μg/mL. Results from these studies support that 10 mg cefquinome/kg body weight daily could be expected to control tilapia bacterial pathogens inhibited in vitro by a minimal inhibitory concentration value of ≤2 μg/mL.     

Pharmacology of topical prostaglandin F2α analogs and their place in the treatment of glaucoma in small animals

A distinguishing feature of the most common types of glaucoma is an increased intra‐ocular pressure (IOP), which has a damaging effect on optic nerve axons, leading to the progressive loss of retinal ganglion cells. Therefore, IOP‐lowering medications are the mainstay of glaucoma therapy. Topical prostaglandin F₂α analogs (PGAs) are a relatively new class of ocular hypotensive drugs, which have made a huge impact on the treatment of glaucoma in dogs. This study summarizes the current state of knowledge on the mechanism of action of these agents and their effect on IOP in dogs and cats. It also discusses potential harmful side effects of PGAs and presents contemporary opinions about their role and place in the medical management of glaucoma in small animals.     

钢铁企业焦化工序节能减排途径探讨

从焦化技术改进、资源综合利用、余热回收利用三方面探讨了钢铁企业焦化工序节能减排途径。分析了捣固炼焦、干熄焦等技术,为钢铁企业实施节能减排提供参考。     

清洁能源产业发展财税政策研究综述

搜集了大量中文、英文文献,对“我国清洁能源产业发展财税政策”的相关研究进行了一个系统、全面的文献综述。从清洁能源产业的历史地位、现状、促进我国清洁能源产业发展的财税政策研究等角度,整理了现有文献的观点,在总结学术界研究特点基础上,分析了几种代表性的观点。研究发现：目前我国清洁能源产业正处于初始阶段,仍然存在许多困境,我国必须针对于这些不足,制定合理的财税政策来促进清洁能源产业的发展。以期为研究我国清洁能源产业发展财税政策提供参考。     

膜下滴灌结合暗管排水技术改良新疆盐碱地效果综述

膜下滴灌技术的大面积推广和应用,为新疆乃至西北干旱地区作物高产提供了强大的技术支撑。应用在盐碱地改良中,膜下滴灌“有灌无排”模式仅调节耕层盐分分布,并不能将盐分排出土体,长年灌溉容易引起爆发式积盐的风险,而暗管排水是目前公认的改良盐碱地最直接、最有效的方法。目前,将膜下滴灌与暗管排水有机结合形成的新型灌溉技术,充分利用膜下滴灌良好的抑蒸增温、节水抑盐等优势,同时利用暗管将淋洗盐水及时排出土体,使盐碱化土层产生新的水盐平衡,已在新疆盐碱地区开发利用中得到长足发展。本文重点分析并总结了新疆灌区膜下滴灌结合暗管排水系统的设计参数及土壤水盐运移规律,并综述了土壤理化性质及作物产量对该灌排技术的响应研究,以期为新疆盐碱地农业可持续发展提供理论依据和技术指导。