Phorbol esters enhance glutathione-induced feeding response in Hydra

Summary Pharmacological observations on the glutathione-induced feeding response in Hydra demonstrate that phorbol esters, calcium ionophore A 23187 and lithium ions significantly enhance and protract glutathione action, whereas polymixin B induces a dramatic shortening of the feeding response. An involvement of membrane phosphatidylinositol breakdown in the control of the feeding response is suggested.     

Control of the cardiovascular system ofAplysia by identified neurons

The neural network that controls the cardiovascular system ofAplysia adapts cardiovascular function to a variety of different physiological and behavioral situations. It (1) coordinates the cardiovascular system with the renal and respiratory systems; (2) modifies both systemic and regional blood flow during food-elicited arousal and feeding; and (3) changes the tension of longitudinal vascular muscle to adapt the arterial tree to changes in body shape. Indirect evidence suggests that the cardiovascular control circuit may also play a role in maintaining homeostasis during egg laying. Several putative neurotransmitters, including acetylcholine, serotonin, R151 and R152 peptides, have been localized to identified neurons in this circuit.     

FUZZY-PID 双模定量给料电子皮带秤控制器

介绍了笔者开发研制的ＦＵＺＺＹ—ＰＩＤ双模定量给料电子皮带秤控制器，阐述了该控制器的控制算法和硬件软件设计。     

Cholesterol feeding to rats does not modulate the expression of binding sites for HDL on liver membranes

Summary The binding of HDL, Apo-E-free, was studied in rats fed a cholesterol rich diet for 2, 4 and 7 days. Plasma cholesterol increased up to 16-fold (from 55 to 900 mg/dl); liver cholesterol was also raised, from 0.5 to 16 mg/g of tissue. The HDL binding to membrane preparations was not affected while the binding of VLDL was reduced to about 50% of the controls. These data show, therefore, that liver binding sites for HDL are refractory to regulation by dietary cholesterol.     

Genetic and molecular approaches to synthesis and action of the yeast killer toxin

Summary The K1 killer toxin ofSaccharomyces cerevisiae is a secreted, virally-coded protein lethal to sensitive yeasts. Killer yeasts are immune to the toxin they produce. This killer system has been extensively examined from genetic and molecular perspectives. Here we review the biology of killer yeasts, and examine the synthesis and action of the protein toxin and the immunity component. We summarise the structure of the toxin precursor gene and its protein products, outline the proteolytic processing of the toxin subunits from the precursor, and their passage through the yeast secretory pathway. We then discuss the mode of action of the toxin, its lectin-like interaction with a cell wall glucan, and its probable role in forming channels in the yeast plasma membrane. In addition we describe models of how a toxin precursor species functions as the immunity component, probably by interfering with channel formation. We conclude with a review of the functional domains of the toxin structural gene as determined by site-directed mutagenesis. This work has identified regions associated with glucan binding, toxin activity, and immunity.     

科尔沁牛公犊早期补饲高档精料60日龄断奶及阶段育肥技术研究

科尔沁牛公犊早期补饲高档精料60天断奶及阶段育肥技术研究结果表明：犊牛5日龄开始补饲高档精饲料、7日龄开始补饲优质干草，丰富了犊牛获取的营养种类，充分满足各种营养需要，早期补饲刺激瘤胃，促使整个消化系统的发育，增强消化吸收能力，从而加快犊牛生长发育速度，日增重可达0.774Kg，60日龄断奶体重可达79.29Kg，公犊进行61～120日龄和121～360日龄阶段育肥（12月龄）体重达513.18Kg,屠宰率达52.43%，育肥牛饲养期缩短6～12个月，有显著的经济效益.     

超细分级机进料管内颗粒分散的数值模拟

采用欧拉-拉格朗日模型对超细分级机进料管内的气固两相流进行了数值模拟。通过引入颗粒浓度分布不均匀度,建立了颗粒分散性的评价方法,对比分析了导流片数量、尺寸、间距分布形式、入口风速、入口固体浓度、粒径对颗粒分散性的影响。结果表明:导流片的添加能提高颗粒的分散性;随着入口风速的提高,颗粒分散性逐渐提高,当风速大于13.6m/s时,分散性变化不大;随着入口固体浓度的增加,颗粒分散性降低;随着粒径的增加,颗粒浓度分布不均匀度增加,颗粒的分散性变差,当粒径大于50μm时,颗粒分散性基本不变。     

饲料配方设计的模拟优化策略

高技术、高效益是市场竞争中不可缺少的法宝，本文在饲料配方设计中首次引入了新颖、高效的组合优化算法－模拟退火算法，并获得理想的数值结果，说明了在传统的饲料配方设计中高技术的应用可以获得更高的效益。     

Ultrastructure of the pereopodal dactyls in the family Phronimidae Dana, 1852 (Crustacea: Amphipoda: Hyperiidea)

Species of the Phronimidae were studied for the micromorphology of their pereopods. Novel structures were found on the dactyls and are described in detail. A hypothesis is advanced that these structures serve also for external digestion and absorption of the tissues of their gelatinous plankton hosts.     

将军饮马与最小二乘法——谈数形结合的思想方法

本文介绍体现数形结合思想方法重要性的两个十分精彩的例子.