受体阻断剂改善家兔急性脑缺血的研究

利用家兔制备急件不完全世脑缺血模型，选择Ｒｅｇｉｔｉｎｅ作为α－子体阻断剂，通过静脉给药，旨在探寻临床急性脑缺血状态下改善脑血流量的救治方法。结果表明，静注Ｒｅｇｉｔｉｎｅ后，可使脑血管迅速舒张，脑血流量有效增加，平均动脉压可稳定在一定水平，心电图ＳＴ段和心率无显著改变。     

Permanent transvenous cardiac pacing

Transvenous cardiac pacing is a commonly employed treatment for symptomatic bradyarrhythmias in dogs. Medical management of these conditions has not proven to be successful leaving pacing as the only viable alternative. The technique of pacemaker implantation is not difficult, but successful pacemaker therapy requires an understanding of electrophysiology, cardiac fluoroscopic anatomy, pacemaker instrumentation, and programming. Proper patient selection and identification of the underlying rhythm disturbance is essential to a successful clinical outcome. This article discusses the indications, equipment, techniques, complications, and outcome of permanent transvenous cardiac pacing.     

加拿大一枝黄花燃烧块燃烧特性试验研究

对不同压力和温度下压制的加拿大一枝黄花(Solidago canadensis L.)燃烧块的燃烧特性进行了试验分析。结果表明,不同压力压制的燃烧块其燃烧效率差异显著;不同温度下压制出的燃烧块其燃烧效率差异极显著,燃烧时间和无焰燃烧温度差异显著;不同压力、温度及两者的交互作用与各指标间的差异均不显著。经多重比较,各种压力下,60℃压制出的燃烧块是最优的,可以为用户提供优质的燃烧块。同时,压制燃烧块过程中,加温不应超过70℃,否则燃烧块的燃烧特性会明显变差。     

实用AutoLISP程序设计

介绍了几个用AutoLISP语言设计的实用CAD指令——图块计数、双边等距、门安装、求透视等。这些指令短小精悍,对于建筑制图有很好的辅助作用。详细论述了它们各自具备的功能和操作过程,同时在论文中提供了全部原程序代码供读者上机检验。     

Approaches to Promote China＇s Low Carbon Agricultural Development

Low carbon agriculture is a new production mode of green agriculture development to face the challenge of the global climate change, and a kind of innovation on developing circular agriculture. Up to n...     

Study on high and steep slope stability Based on 3D laser scanning

Dangerous mountain construction projects block of high and steep slope stability is the important issue of security and disaster prevention, investigation on the surface of the dangerous mountain high and steep slope rock mass structure is the key to the analysis of the problem. The high slope of a major project of the Lancang River, the application of 3D laser scanning technique to study the long-distance survey analysis of rock mass structure analysis method to analyze the distribution of the surface space of the high and steep slope rock mass structure, statistical analysis direction of the advantages of the structure surface and the distribution of rock blocks, as the basis for the application of limit equilibrium analysis method to study the stability of rock blocks of the high and steep slope.     

建筑节能型环保砌块在新农村住房建设中的应用性研究

通过对新型建筑节能型环保砌块在技术和环境保护等方面的调查研究,针对目前新农村建设中农村居住环境改善的技术问题,阐述了该类砌块在新农村住房建设中的应用性。     

Comparison of bupivacaine femoral and sciatic nerve block versus bupivacaine and morphine epidural for stifle surgery in dogs

ObjectiveTo evaluate the efficacy of combined femoral and sciatic nerve blocks as an alternative to epidural anesthesia and analgesia in dogs undergoing stifle surgery under general anesthesia.Study designProspective, blinded, randomized, clinical comparison.AnimalsTwenty dogs weighing 37 ± 11 (mean ± SD) kg, aged 3 (1–8) [median (minimum–maximum)] years undergoing elective unilateral tibial-plateau leveling osteotomy.MethodsDogs were assigned randomly to receive either epidural anesthesia (bupivacaine 0.5%, 0.5 mg kg^?1 + morphine 0.1%, 0.1 mg kg^?1, in 0.2 mL kg^?1; EPID) or femoral and sciatic nerve blocks (Bupivacaine 0.5%, 0.1 mL kg^?1, was administered at each site; F + S) guided by electrolocation. All patients received a standard general anesthesia technique. Pain and sedation were scored (on scales of 0–10 and 0–3, respectively) pre-operatively, at extubation, and at 1, 4 and then every 4 hours thereafter up to 24 hours. Postoperatively, hydromorphone was administered to any patient with a pain score of >5 or whenever the blinded caregiver determined that more hydromorphone was necessary. Intraoperative heart rate (HR), mean arterial pressure (MAP), end tidal isoflurane (FE′ISO), body temperature, post-operative pain scores, time to first hydromorphone dose after surgery, time to first feeding, time to first drinking, time to first urination, time to first ambulation (walk on a lead) and cumulative dose of hydromorphone were recorded.ResultsIntra-operatively, FE′ISO and MAP were significantly lower in the EPID group (p = 0.05 and p = 0.04, respectively). Postoperatively, the cumulative hydromorphone consumption (p = 0.04) and the incidence of urinary retention (p = 0.03) were higher in the EPID group.Conclusion and clinical relevance F + S is a practical alternative to EPID that produces less urine retention and reduces opioid consumption in the 24 hours after surgery. EPID might be associated with a lower isoflurane requirement and lower systemic blood pressure.     

恩拉霉素高产菌株的快速选育

为筛选恩拉霉素高产菌株,降低生产成本,以生产用Streptomyces-483为出发菌株,进行紫外-氯化锂复合诱变。以金黄色葡萄球菌为指示菌,用琼脂块法测定抑菌圈大小,筛选出84株突变株,经摇瓶初筛、复筛、5L发酵罐验证,最终获得4株高产突变株。筛选得到的4株高产突变株经稳定性考察完全适用于生产。     

基质块苗移栽机挡销式自动送苗分苗装置设计与试验

针对叶类蔬菜自动移栽送-分苗成功率低和伤苗率高的问题,该研究以甘蓝基质块苗为对象,设计了一种输送带+挡销组合式送-分苗装置,结合甘蓝基质块苗力学特性,开展送-分苗过程理论分析,确定装置稳定送-分苗条件和关键机构工作参数。搭建试验台进行单因素试验,确定关键因素参数范围,选取前输送带电机转速、后输送带电机转速和挡销频率为主要试验因素,以分苗成功率和基质块破损率为评价指标进行Box-Behnken中心组合试验,建立二阶回归模型,分析各影响因素对指标的影响关系并进行综合优化。试验结果表明：前输送带电机转速104 r/min、后输送带电机转速75 r/min、挡销频率1.85 s/次时送分苗效果较优,台架验证试验分苗成功率92.73%、基质块破损率4.09%,田间验证试验分苗成功率91.81%、基质块破损率4.62%,两指标的两次验证试验与优化结果相比误差值均小于2%,表明该装置具有较高的稳定性。该研究可为蔬菜自动移栽装备的设计提供参考。