Regulation of C/N Interaction in Model Plant Species

Summary

Carbon (C) and nitrogen (N) metabolisms are two major metabolic pathways which have been intensively studied in plants. Both N and C metabolisms are tightly linked in numerous plant biochemical pathways. Therefore the C to N ratio has to be carefully regulated to ensure proper functioning of the huge metabolic network. In order to maintain a viable C/N status under a large range of growth conditions plants have evolved complex mechanisms to regulate the delicate network of these two major assimilatory pathways. C and N metabolisms are both highly regulated. We will present the current knowledge on the regulation of N and C metabolisms by sugars and N metabolites. Players involved in these regulatory processes are just starting to be uncovered and possible signaling molecules involved in these regulations as well as known or potential candidate regulatory genes willbe discussed.     

野生和人工栽培缬草香精油的GC/MS分析对比研究

应用ＧＣ／ＭＳ／ＤＳ分析对比研究野生和人工栽培香料油，分别鉴定出３４个和２８个化合物，两种香精油其相组分２１个。占总精油组分的９１％－９６％，主成分基本相同，占精油总量的７８％－８５％，其成分上的差异对其在香料工业、日化、食品、饮料、医药工业上的应用没有影响，为缬草开发利用建立家种缬草原料基地，保证缬草香料油工业化生产提供依据。     

Biochemical indices (RNA/DNA ratio and protein content) in studying the nutritional status of Ruditapes decussatus (Linnaeus 1758) juveniles

In this work, we investigated the nutritional status of Ruditapes decussatus juveniles under different rearing conditions, using biochemical indices (RNA/DNA ratio and protein content) and the linear instantaneous growth rate (IGR). Two experiments were conducted to study the effect of starvation, addition of substrate (sand) as rearing support and diet composition on somatic growth and biochemical indices. Results show that biochemical indices of fed juveniles were significantly (P<0.05) higher. Highest RNA/DNA values and protein content were recorded in fed juveniles reared with substrate (P<0.05); conversely, lowest values were recorded in starved ones reared without substrate. In the second experiment, the highest RNA/DNA ratio was recorded in juveniles fed with control algal mixture composed of species commonly used in bivalve nurseries [Isochrysis galbana (clone T-Iso), Chaetoceros calcitrans and Tetraselmis suecica] and lowest in those fed with algal species isolated from Tunisian coasts. This confirms the usefulness of the RNA/DNA ratio and protein content in the clam's nutritional status evaluation. This assay is useful to provide information about the nutritional status and health of the clam in field conditions.     

DHF65—39/450型沸腾炉的大件安装

文内介绍了DHF65—39/450型沸腾锅炉安装中主要部件的吊装办法及程序。对同类或近似的锅炉安装具有一定的参考价值。     

海南州农业综合开发畜牧项目实施效益分析报告

畜牧项目是海南州农业综合开发项目的主要建设项目之一 ,通过四年的实施 ,已完成计划投资的 1 0 3 .63 %。监测表明 ,项目实施经济效益明显 ,群众经营观念和经营方式有所改变 ,人均收入由项目前的 5 94.43元提高到 1 0 76元 ,增长 81 .1 3 % ;草地生态环境得到初步改善。     

二进制与十进制动态显示的关键技术

二进制是计算机中所采用的数据表示形式,在文章中介绍了基于VRML与JAVA的虚拟动态交互技术,分析了利用Java或JavaScript语言创建出新的内插节点和传感节点来驱动和控制整个虚拟空间的方法,研究了利用VRML和Java的技术去设计动态交互的场景,实现了二进制与十进制之间的动态交互显示,最后指出该系统已被成功运用于教学,文章的创新点在于利用PRO/E优化建模。     

USE OF INTRAOPERATIVE MESENTERIC PORTOVENOGRAPHY IN CONGENITAL PORTOSYSTEMIC SHUNT SURGERY

A retrospective study of the use of intraoperative mesenteric portovenography (IOMP) in the surgical management of congenital portosystemic shunts in 100 dogs and cats was performed. Each portovenogram was scored using a subjective visual analogue scale (VAS) and was assessed for the presence of portal atresia or hypoplasia. VAS scores and portal hypoplasia assessments were obtained for portovenogram images obtained for each animal both before shunt manipulation (preligation) and following the temporary, complete ligation of the vessel (postligation). In each patient, surgical records were reviewed to ascertain the degree of shunt attenuation that was achieved at surgery. Hepatic portal vasculature was significantly different on postligation compared with preligation IOMP. Sixty-two percent of animals had apparent portal hypoplasia or atresia on their preligation IOMP. The majority of these (81%) had an improvement in portal vasculature on postligation IOMP. It was concluded that both preligation and postligation IOMP provided valuable information regarding the morphology of congenital portosystemic shunts. An accurate assessment of an animal's portal vasculature could only be made following the interpretation of a postligation portovenogram, and these findings significantly influenced the surgical management of the patient. Although individuals with high postligation VAS scores were more likely to achieve full shunt attenuation at surgery, there was no quantifiable relationship between IOMP findings and the degree of shunt attenuation achieved.     

Study of Direct Methanol Fuel Cell for Portable Application

A technique of fabrication of air electrode for direct methanol fuel cells (DMFC) is proposed. The investigated air electrode is free of Teflon- containing and with ultra- thin catalyst layer. Catalysts PtRu/C for methanol electroxidation is electrochemically deposited on a Nafion- bonded carbon electrode. A concept, that is, methanol is oxidized at a relatively high potential, is proposed. Such a fabricated DMFC is characterized with a high utilization of noble metals and basically eliminating CO poisoning in operation.     

数据挖掘技术在病虫害防治决策中的应用

本文介绍了数据挖掘技术以及它在病虫害防治决策中的应用。引入了分布式对象技术、多层架构、Web方式表达 ,即 :构件 B/S Java Internet架构 ,来解决决策中的问题。我们将看到此技术是有效和实用的