A newly published AIDS study could open another front in the battle against HIV infection by showing that gene therapy can be used to stop infected cells from spreading the deadly virus, researchers said.
In a test-tube experiment believed to be the first of its kind, researchers based at Children’s Hospital of Philadelphia were able to block the operation of the" tat "gene that allows HIV to spread throughout the body from infected cells.
Up to now, genetic AIDS research has concentrated on finding ways to help healthy cells withstand the ravages of the HIV virus that infects an estimated 16, 000 new victims a day, mainly in the developing world.
But by working with human cells already infected with HIV, the team was able to reduce the tat gene’s virus-replicating functions by 80 percent to 90 percent, according to findings published in the journal Gene Therapy.
That, researchers said, raises the possibility of a new gene the
A. AIDS study raises hopes for gene therapy treatment.
B. A new killer of HIV virus.
C. Research on gene therapy.
D. Gene therapy proves to be the ultimate solution to HIV infection.
to get from Kathmandu to the tiny
village in Nepal, Dave Irvine-Halliday spent more than two days. When he
arrived, he found villagers working and reading around battery-powered lamps
equipped with light-emitting diodes, or LEDs--the same lamps he had left there
in 2000. Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing Countries. In fact, LEDs have big advantages over familiar incandescent (白炽的)lights as well--so much so that Irvine-Halliday expects LEDs wil A. were given by Irvine-Halliday B. are rugged C. are cheap D. are easily-recharged [判断题]调度业务联系基本规定是:下级调度机构必须服从上级调度机构的调度。调度机构调度管辖范围内的发电厂、变电站的运行值班单位,必须服从该级调度机构的调度。
A.正确 B.错误 [单选题]B县大型超市Y持有烟草专卖零售许可证,在B县拥有三家连锁分店。Y准备在C县分别开办分店Z和P,在申请烟草专卖零售许可证时,应( )烟草专卖局提出申请。
A.Z或P向B县 B.Z和P分别向C县 C.Z或P向C县 D.Z和P分别向B县 [单项选择]工程结构应满足()的功能要求。
A. 安全性、实用性、耐久性 B. 安全性、适用性、美观性 C. 安全性、实用性、美观性 D. 安全性、适用性、耐久性 [简答题]牵引电动机的半悬挂有何优缺点? P94T415
[判断题]有砟桥上应设挡砟墙(块),无缝线路地段应满足砟肩堆高的要求。
A.正确 B.错误 [单项选择]GB50325-2010中规定混凝土外加剂中氨的释放量()。
A. ≤0.10% B. ≤100mg/kg C. ≤0.50% D. ≤500mg/kg [单项选择]用一个杯子盛满水向一个空罐里倒水。如果倒进2杯水,连罐共重0.6千克;如果倒进5杯水,连罐共重0.975千克。这个空罐重( )千克。
A. 0.35 B. 0.45 C. 0.375 D. 0.25 [单选题] 半导体激光器( LD )的主要适用于( )的光纤通信系统。
A.长距离大容量 B.短距离大容量 C.长距离小容量 D.短距离小容量 [单项选择]能指明疼痛部位的牙齿病症哪一种,除外()。
A. 急性牙髓炎 B. 急性根尖炎 C. 急性牙周脓肿 D. 牙本质敏感症 E. 急性龈乳头炎 [判断题]事故隐患泛指生产系统中可导致事故发生的人的不安全行为、物的不安全状态和管理上的缺陷。
A.正确 B.错误 [单项选择]大家编码的一致性程度相差较大的原因是()。
A. 没有统一标准 B. 访谈方式不一 C. 个人能力有差异 D. 编码的时间不同 [单选题](63732)熟练掌握有关的技术作业过程表(图),是确保( )修的必备条件。(2.0分)
A.按范围 B.程序化 C.按工艺 D.文明化 [单项选择]灵山大佛高()米,是无锡的标志之一。
A. 68 B. 88 C. 98 D. 108 [单项选择]“实践、认识、再实践、再认识,这种形式,循环往复以至无穷”体现的是()
A. 唯心主义辩证法 B. 唯物主义辩证法 C. 朴素唯物主义观点 D. 机械唯物主义观点 [多项选择]历史文化保护区保护规划的内容为( )。
A. 现状调查 B. 保护规划 C. 保护规划实例 D. 提出实施管理建议 E. 确定近期保护目标 [单项选择]Why did Joy leave her children in the car
[单选题]对于列车的确报,一般要求是小运转和摘挂列车出发前()要发出确报。
A.10min B.15min C.20min D.25min [单项选择]商务谈判双方的基本出发点是:( )。
A. 坚持利益为本 B. 坚持互惠互利 C. 坚持客观标准 D. 坚持求大同存小异 [单选题]应坚持()的原则,立即劝阻疏散正在乘降的旅客到安全白线以内,列车员应尽可能撤下安全踏板。(汇编)
A.救人为先 B.拧扒勿漏 C.宁漏勿扒 D.安全第一 [判断题]TN-S系统适用于安全要求较高的场所,TN-C系统适用于危险较低且用户线路较简单的场所
A.正确 B.错误 [简答题]分公司主要负责人、安全生产管理人员安全教育培训应当包括哪些内?
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