Animal, vegetable or cerebral: brains in agricultural production

Recent developments in brain research seem to have passed unnoticed in veterinary and agricultural circles. Yet they have transformed views on the subject and, Dr Cross argues, made study of the brain mandatory for future advance in animal health and production.     

Aldosterone secretion during high sodium cerebrospinal fluid perfusion of the brain ventricles

Conscious sheep with permanent indwelling cannulae in the lateral ventricles and the cisterna magna were Na depleted and then perfused for 9 h with an artificial CSF solution. There were 3 experimental groups: Group I (n=5) received perfusion with aritifical CSF containing NA 170 MEq./1, Group II (n=7) received perfusion with artificial CSF containing Na 145 mEq./1, Group III (n=7) received no perfusion. In Group I the blood aldosterone level fell from 26.4 +/- 7.4 to 8.6 +/- 2.3 ng/100 ml by 9 h after perfusion. There was no significant change in plasma [Na] or [K], blood angiotensin II or plasma renin concentration. Blood cortisol and corticosterone levels rose. There was also a fall in post-perfusion. Group III showed no significant change in blood aldosterone concentration. Multivariate statistical analysis showed that the fall in aldosterone levels during 170 mEq./l Na perfusion could not be accounted for by changes, either alone or together, of ACTH as evidenced by alteration in blood cortisol or corticosterone, or by change of plasma [Na], [K] or renin concentrations. This data supports the hypothesis of an additional factor which may be of CNS origin being involved in the control of aldosterone secretion.     

A statistical note on the association of colorectal cancer and lymphoma

The degradation and excretion of 2-14C-uric acid were examined in three adult woolly monkeys (Lagothrix lagothrichia) to determine the basis for the relatively high serum and urinary uric acid concentrations previously reported in this species. Like man and the great apes which lack uricase, but in distinction to most other mammals, these animals converted very little urate to allantoin. Uric acid turnover, as has been reported for other New World monkeys, was several times that of normal man. Renal urate excretion as well as disposition by extrarenal mechanisms may protect Lagothrix vrom hyperuricemia. The capacity to convert urate to allantoin appears to have been lost late in the evolution of New World monkeys. The woolly monkey deserves further study as a primate model for investigations of enzyme replacement strategies.     

The maximum surgical blood order schedule and surgical blood use in the United States

The outdating of units of blood can be reduced by decreasing the amount of time they spend in an assigned or crossmatched status. This reduction can be achieved in a hospital by establishing a maximum surgical blood order schedule (MSBOS) which reduces the excessive number of units of blood crossmatched preoperatively for patients undergoing elective surgery. The various steps which occurred in the development of a MSBOS in a large general hospital are detailed and the projected reduction in the number of crossmatched units which can be achieved with the MSBOS is illustrated. illustrated. The projected number of units of blood transfused to patients during their hospitalization for 50 common primary surgical procedures in the United States during 1974 is presented as a basis for defining maximum blood orders for each procedure.     

An improved snare system for the nonsurgical retrieval of intravascular foreign bodies

We have modified a snare technique originally described for transcolonoscopic removal of colonic polyps for the retrieval of intravascular foreign bodies. The key difference from other snare techniques is the employment of a wire snare with a crimp in its midportion that enables the formation of a loop in a plane perpendicular to the axial direction of the guiding catheter. With this technique we have quickly removed a variety of objects from the right heart and pulmonary arteries in four patients.     

基于TINI平台的嵌入式互联网接入技术研究

随着网络技术的发展,将各种设备接人互联网,利用互联网实现数据传输与远程监控成为当今电子设备发展的必然趋势.文中介绍了DS80OC400芯片以及基于此芯片的TINI系统.提出了采用TINI系统来实现非网络设备接入互联网的方法,包括硬件结构、软件设计以及开发流程等,并以RS-232接口为例,给出了此方法的具体实现.与传统的通过PC机转接的方法相比,此方法具有开发成本低、效率高、运行稳定、低功耗、体积小等特点.     

磁控反应溅射氧流量变化对TiO2薄膜影响的实验研究

通过中频交流磁控溅射设备,利用金属Ti靶制备出了有一定厚度的、质量较好的TiO2薄膜,TiO2薄膜被沉积在玻璃基底上.利用各种分析测试手段对其性能进行了测试,初步探讨了不同氧流量对TiO2薄膜的影响.实验表明,不同氧流量下制备的TiO2薄膜的亲水特性发生了变化.