对节白蜡的组织培养及植株再生

1植物名称对节白蜡（Fnainushupehen－sis）,又名湖北白蜡,湖北俗称对节树、望乡树。2材料类别幼嫩茎段,取自本校盆景园20～30年生中型盆景桩（高50～60cm）当年新梢。3培养条件分化培养基：（1）MS＋6－BA2．5mg·L－1（单位下同）;（2）MS＋6－BA5．0;（3）MS＋6BA10．0;（4）WPM＋6-BA2．5;（5）WPM＋6－BA5．0;（6）WPM-6-BA10．0;（7）DKW＋6－BA2．5;（8）DKW＋6－BA5．0;（9）DKW＋6－BA10．0。生根培养基：（1）WPM＋IBA0．5;（11）WPM＋IBA2．0。以上培养基均附加蔗糖30g·L－1,琼脂6g·L-1…     

DPC和KH2PO4浸种对棉花叶片光合特性的影响

利用缩节安（ＤＰＣ）和磷酸二氢钾（ＫＨ２ＰＯ４）单独和混合浸种的方法,对棉籽播前浸种处理,可以增加棉花叶片叶绿素含量,提高ＰＳⅡ光化学活性和原初光能转换效率,以及叶片光合速率。ＤＰＣ和ＫＨ２ＰＯ４混合处理的效果优于单独浸种处理     

一株高效广谱莠去津降解菌SB5的生长和降解特性

本研究采用富集培养技术自莠去津污染的活性污泥中分离筛选到一株具有降解三嗪类除草剂功能的菌株SB5,经形态学和16S rRNA基因分析将其初步鉴定为类节杆菌属细菌.其具有已知莠去津降解相关基因trzN、atzB及atzC.在培养基中添加葡萄糖、蔗糖、柠檬酸钠、酵母浸粉和蛋白胨可显著提高菌株SB5的生物量和对莠去津的降解效...     

百部属一新种

百部属一新种,即山东百部Semona shandongensis D.K.Zang,与近缘种进立百部S.sesilifolia Miq。区别在茎生,叶倒卵形,茶梗与叶柄及叶片基部贴生,花被片不反曲,宽达0.4-0.6cm,外轮2片较狭。     

日本节节草(新组合变种)在中国的新记录

本文报导了Milde1865年根据日本产标本命名的Equisetum ramosissimum Desf.var.japonicum Milde在我国山东的新记录,并进行了新组合:Hipppchaete ramosissima(Desf.)Boerner var.japonica(Milde)J.X.Li et F.Q.Zhou,comb.nov.     

藜芦碱和乌头碱在受损背根节神经元诱发不同的放电模式

为了研究钠通道失活门阻断后受损背根节神经元放电模式的变化特征,在大鼠背根节慢性压迫模型上采用单纤维技术记录A类神经元的自发放电。藜芦碱和乌头碱是钠通道失活门的抑制剂,但二者作用于不同的位点,前者结合于D2-S6,后者结合于D3-S6。我们比较了这两种试剂引发的放电模式。结果发现,在同一神经元,藜芦碱(1．5～5．0μmol／L)可以引起放电峰峰间期的慢波振荡,即峰峰间期由大逐渐减小,然后又逐渐增大,形成重复的振荡波形,每个振荡持续约数十秒至数分钟：而乌头碱(10～200μmol／L)则引起强直性放电,即峰峰间期逐渐减小,然后维持在一个稳定的水平。这两种不同的放电模式不因背景放电或试剂浓度的不同而发生明显的改变。实验结果表明,藜芦碱和乌头碱在受损的背根节神经元可以引发不同的放电模式,这可能与它们结合于钠通道上不同位点的抑制作用有关。     

浅部真菌病治疗进展研讨会暨“必亮”上市会会议纪要

由本刊编辑部与重庆华邦制药有限公司联合主办的“浅部真菌病治疗进展研讨会”于2006年7月5日-9日在成都市召开。来自全国20余个省、市、自治区百余名代表参会。     

β-肾上腺素能激动剂对犬冠状动脉节段阻力的影响

在麻醉开胸犬研究了冠状动脉内注入异丙肾上腺素对冠状动脉节段阻力的作用。冠状动脉内预先给心得宁2.5mg 以阻断心脏的β_1-肾上腺素能受体。冠状动脉左旋支恒流灌注,测量左旋支近端压及其远端小冠状动脉压,记录心电图。冠状动脉内给异丙肾上腺素后,冠状动脉左旋支总阻力及心肌内小冠状动脉阻力分别由4.54±0.77(M±SD)和4.20±0.75下降至3.95±0.69(P<0.05)和3.43±0.66mmHg·min/ml(P<0.05),而心外膜大冠状动脉阻力反趋增大,由0.35±0.11上升至0.53±0.34mmHg·min/ml(P>0.05)。实验证明,β-肾上腺素能活动时在体犬冠状血管的直接作用主要是舒张心肌内小冠状动脉,使其阻力显著减低,而心外膜大冠状动脉阻力趋向继发性增大。     

Anti-bat tiger moth sounds: Form and function

The night sky is the venue of an ancient acoustic battle between echolocating bats and their insect prey. Many tiger moths (Lepidoptera: Arctiidae) answer the attack calls of bats with a barrage of high frequency clicks. Some moth species use these clicks for acoustic aposematism and mimicry, and others for sonar jamming, however, most of the work on these defensive functions has been done on individual moth species. We here analyze the diversity of structure in tiger moth sounds from 26 spe-cies collected at three locations in North and South America. A principal components analysis of the anti-bat tiger moth sounds reveals that they vary markedly along three axes: (1) frequency, (2) duty cycle (sound production per unit time) and frequency modulation, and (3) modulation cycle (clicks produced during flexion and relaxation of the sound producing tymbal) structure. Tiger moth species appear to cluster into two distinct groups: one with low duty cycle and few clicks per modulation cycle that supports an acoustic aposematism function, and a second with high duty cycle and many clicks per modulation cycle that is con-sistent with a sonar jamming function. This is the first evidence from a community-level analysis to support multiple functions for tiger moth sounds. We also provide evidence supporting an evolutionary history for the development of these strategies. Further-more, cross-correlation and spectrogram correlation measurements failed to support a "phantom echo" mechanism underlying sonar jamming, and instead point towards echo interference.