共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
3.
家福捕鸟蛛是一种生活在中国广西、云南等省山区,中等个体,产毒量较大蜘蛛新种.研究发现它的毒液中含有许多不同活性的成分.为了更好地开发利用该种生物资源,评估其毒性大小,测定了家福捕鸟蛛粗毒对美洲蜚蠊和小鼠的半致死剂量.家福捕鸟蛛粗毒对美洲蜚蠊具有较强的毒性,低剂量的粗毒对美洲蜚蠊具有一定的毒性,高剂量的粗毒能够使美洲蜚蠊在几分钟内致死.家福捕鸟蛛粗毒对美洲蜚蠊的半致死剂量为85.90μg/g.但家福捕鸟蛛粗毒对小鼠的毒性较弱,当注射剂量达到10 mg/kg体重时小鼠未见明显的中毒症状.当注射的粗毒剂量达到46.30 mg/kg时小鼠在24 min内死亡.家福捕鸟蛛粗毒可能主要是一类选择性作用于昆虫的蜘蛛毒素. 相似文献
4.
HWTX是我国珍稀蜘蛛虎纹捕鸟蛛分泌的毒素,能使小型哺乳动物和昆虫致死,通过二维电泳可分离到约400多种蛋白质和多肽,14种已被纯化及鉴定。其中丰度最高的是虎纹蜘蛛毒素-I（HWTX-I）,亦称虎纹镇痛肽（HWAP-I）,其已作为国家I类镇痛新药应用于临床研究。现对HWTX-I的生物学作用进行阐述,再对其在运动损伤领域中的应用进行展望。 相似文献
5.
HWTX是我国珍稀蜘蛛虎纹捕鸟蛛分泌的毒素,能使小型哺乳动物和昆虫致死,通过二维电泳可分离到约400多种蛋白质和多肤,14种已被纯化及鉴定.其中丰度最高的是虎纹蜘蛛毒素-Ⅰ(HWTX-Ⅰ),亦称虎纹镇痛肤(HWAP-Ⅰ),其已作为国家Ⅰ类镇痛新药应用于临床研究.现对HWTX-Ⅰ的生物学作用进行阐述,再对其在运动损伤领域中的应用进行展望. 相似文献
6.
我国狒蛛科一新种及海南捕鸟蛛的分类研究（蛛形纲：蜘蛛目） 总被引：5，自引：0，他引：5
报道了产于中国海南省狒蛛科棒刺蛛亚科Selenocosmiinae缨毛蛛属一新种：敬钊缨毛蛛Chilobrachys jingzhao.sp.nov．0通过对海南捕岛蛛Selenocosmia hainana Liang et al.,1999的研究，认为该种应转移到捕鸟蛛亚科Ornithoctoninae的捕鸟蛛属Ornithoctonus，并对海南鸟蛛Ornithoctonus hanina(Ling et al.,1999）的雌蛛及新发现的雄性进行了描述和图示。 相似文献
7.
《怀化学院学报》2016,(5)
采用全细胞膜片钳分析,测定了家福捕鸟蛛粗毒对DRG细胞上电压门控钠、钾和钙离子通道的影响.结果表明:粗毒对大鼠背根神经节(dorsal root ganglion,DRG)细胞上河豚毒素敏感型钠通道、河豚毒素不敏感型钠通道、电压门控钾通道、高电压激活钙通道和低电压激活钙通道都具有抑制作用.100μg/m L的粗毒分别能够抑制64.0%河豚毒素敏感型钠电流、46.5%河豚毒素不敏感型钠电流、44.2%电压门控钾电流和77.7%低电压激活的钙电流.50μg/m L的粗毒能够抑制大约74.9%高电压激活的钙电流.结果表明家福捕鸟蛛粗毒中可能存在开发为新型药物和离子通道工具试剂的毒素分子. 相似文献
8.
我们在实验室内人工条件下,对鞍形花蟹蛛捕食八点球腹蛛的功能反应进行了初步研究.鞍形花蟹蛛的捕食功能反应是随猎物密度的增加而增大,最大捕食量约为2.5950头,最佳寻找密度为2.1110头.而随其自身密度的增加而减少,随两者密度的增加,相互干扰越显著,捕食作用下降.还建立了参数方程和模拟模型.该参数方程能在一定程度上描述雌成蛛对八点球腹蛛的捕食作用. 相似文献
9.
通过对河北山区枣园蜘蛛的调查,发现有13科53种蜘蛛.优势科为蟹蛛科（Thomisidae）、园蛛科（Araneidae）、狼蛛科（Lycosidae）和皿蛛科（Linyphiidae）.优势种为：三突艾奇蛛（Ebrechtella tricuspidata）、星豹蛛（Pardosa astrigera）、草间钻头蛛（Hylyphantes graminicola）和六痣蛛（Araniella displicata）.分析了蜘蛛生物学特点、植被情况、人事活动对蜘蛛群落结构和优势种群消长变化的影响,分析的结果可为枣园害虫的综合防治提供参考. 相似文献
10.
蛛形纲动物的种类和数量很多,它们的主要特征是头胸部有６对附肢,第一对为螫肢,末端有螯爪,是分泌蛛毒的部位,其分泌的蛛毒具有麻痹猎物的作用;第二对为脚须,或称为触肢;其余四对为步足。具有这种特征的动物不仅仅是人们熟悉的蜘蛛,还有好多动物也具有这样的特征,如与人类有密切关系的蝎、蜱、螨等。蜘蛛是肉食性动物,它们有两种捕食方式：结网捕食和游猎捕食。１结网捕食 自然界中比较常见的圆蛛（见封底图１）,它们喜欢在屋檐下或室内的角落结成圆网,圆网的外围密布蛛丝,丝上有粘滴,一旦昆虫碰到网上就被粘住,圆蛛迅速用… 相似文献
11.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
12.
13.
14.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
15.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
16.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
17.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
18.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
19.
20.
GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献