浅谈高中地理案例教学的应用

地理教学是高中教育的重要组成，完善地理教学过程，提升地理教学质量具有重要作用。关于当前的地理教学，新课程标准明确提出，地理课堂教学要创新教学方法，应用多样化教学手段培养学生地理实践能力与地理核心素养。基于此，本文联系实际，就高中地理课堂如何运用案例教学法展开探究，希望能为相关教学工作的开展提供些许帮助。　</jats:p

假单胞菌P_(12)对菲的降解

从武汉石油化工厂的活性污泥中，分离到一株可以以菲为唯一碳源和能源的假单胞菌P_(12)该菌经靛蓝产生法测定有双加氧酶，在菲无机盐培养基中生长时，有3-菲酚物质积累，经检测有一条质粒带。用丝裂霉素C消除质粒后的菌落，失去了降解菲的能力，说明P_(12)对菲的降解功能是由质粒控制的

Moleculor Clone and Functional Analysis of Betaine Aldehyde Dehydrogenase Gene of Avicennia marina

甜菜碱在植物体内以胆碱为底物,经两步酶催化反应合成,其中催化第二步反应的是甜菜碱醛脱氢酶(Betaine A l-dehyde Dehydrogenase,BADH).为研究甜菜碱醛脱氢酶基因在酵母中是否具有生物学功能,通过PCR-RACE技术从红树植物白骨壤(Avicennia marina)中分离得到BADH基因,将其转入酿酒酵母AH109中.通过对重组酵母生长曲线的测定,发现重组酵母对NaC l的耐受度由转化前的9%提高到14%,表明白骨壤BADH基因在酵母中能得到有效表达出具生物学活性的蛋白质.The synthesis of betaine in plants is two-step oxidation reaction of choline,and the the second step is catalyzed by betaine aldehyde dehydrogenase(BADH).In order to study the function of BADH gene in yeast,the BADH in Avicennia marina was obtained with PCR technique and transformed into Saccharomyces cerevisiae AH109.The salt tolerance of recombinant yeast increased from 9% to 14% by reorganizing the recombinant yeast′s growth curve.The results showed that the BADH gene can be effectively produce protein with biological activity in the recombinant yeast.国家自然科学基金(30771304);; 福建省自然科学基金(B0510002);; 国家基础科学人才培养基金项目(J0630649)资

Avirulent Strain of Ralstonia solanacearum Inducing Plant Systemic Acquired Resistance in Tomato

通讯作者: htzhou@ xmu.edu.cn; saiqunzh@163. com[中文文摘]青枯雷尔氏菌无致病力突变株RS-F523接种后能显著提高番茄对青枯病的抗性,但RS-F523在体外对强致病力菌株RS-F052没有直接的抑制作用.RS-F523接种后植株中与系统获得性抗性(systemic acquired resistance,SAR)相关的过氧化物酶(POD)活性、过氧化氢酶(CAT)活性,H2O2含量以及植株可溶性总蛋白都发生了波动变化,其变化方式和特点与RS-F052接种植株后的变化完全不同,提示RS-F523的生防机制可能与其接种后导致植物的SAR有关.[英文文摘]Tomato resistance ability to Ralstonia solanacearum RS-F052 improves after being inoculated with avirulent strain RS-F523,although RS-F523 cannot inhibit the growing of RS-F052 in vitro.The activities of POD and CAT,the amount of H2O2 and the soluble total proteins,which are all believed to associate with systemic acquired resistance,are tested in the plant which is inoculated with RS-F523.The results show that each of the indexes above fluctuates and differs from that of the plant inoculated with RS-F052,indicating that the biocon trolmechanism of RS-F523 is associated with SAR.国家自然科学基金(30771304);福建省自然科学基金(B0510002);福建省科技计划项目(2005N045);国家基础科学人才培养基金项目(J0630649)资

污染环境中细菌质粒的研究

本研究主要调查了受石油，农药和汞等污染的环境中好氧异养菌的种类及其所携带的质粒，并在恒化器中半连续培养和观察细菌质粒的变化。结果表明在恒化器小生境中76株初始菌检出29株带质粒，6个月后检测出6株菌全带质粒。 从不同地区分离出470株好氧异养菌，用硷裂解和琼脂糖电泳技术测出质粒菌的百分数，它们分别为:石油污染土49%;五氯酚污染土41%，对照土11.3%。 抗汞菌质粒检出数为62%。在1?2株带质粒菌中有78%对石油烃有不同程度的降解作用，这些带质粒菌74.6%是革兰氏阴性菌，其中假单胞菌类占31.6%

Design and Implementation of SCSI Target Emulator *

Abstract: A SCSI target emulator is used in a storage area network (SAN) environment to simulate the behavior of a SCSI target for processing and responding to I/O requests issued by initiators. The SCSI target emulator works with general storage devices with multiple transport protocols. The target emulator utilizes a protocol conversion module that translates the SCSI protocols to a variety of storage devices and implements the multi-RAID-level configuration and storage visualization functions. Moreover, the target emulator implements RAM caching, multi-queuing, and request merging to effectively improve the I/O response speed of the general storage devices. The throughput and average response times of the target emulator for block sizes of 4 KB to 128 KB are 150 % faster for reads and 67 % faster for writes than the existing emulator. With a block size of 16 KB, the I/O latency of the target emulator is only about 20 % that of the existing emulator. Key words: storage area network (SAN); iSCSI; SCSI target emulato