世界奇树扫描

形状古怪的百岁叶 非洲西南部靠近海岸的狭长沙漠带，远远望去，零零落落地生长着一些像大树桩一样的东西。它们叫百岁叶。 百岁叶的长相十分古怪，像树桩的是它的茎，高不到30厘米，然而很粗，直径约有60厘米左右。百岁叶虽然只有两片叶子，但和它的生命共存亡，能生长100多年，所以叫它百岁叶。这是植物王国中最长寿的叶子了。     

木塑复合材料的耐老化性能研究

木塑复合材料的老化性能直接关系其使用寿命和适用范围。该研究使用稻壳、橡胶木锯末和橡胶籽壳分别与回收聚乙烯混合制备木塑复合材料,通过色差分析、红外光谱分析研究了3种木塑复合材料经荧光紫外老化后表面颜色、化学成分的变化。结果表明,经2 000 h老化后,3种木塑复合材料表面均出现褪色、羰基浓度增大,并随着老化时间增加而增加。其中橡胶籽壳基WPCs的变化最大,稻壳次之,橡胶锯末最小。     

轻松上网不烦恼

互联网可以算得上是20世纪最伟大的发明之一。但网络在给人们带来便利的同时，也带来了电脑的克星——病毒。在这里，笔者向大家推荐Ad—aware系统安全工具。它能够通过扫描内存、硬盘以及注册表，并寻找、追踪、确认广告软件以及恶意插件模块，你将不用再担心自己的电脑被一堆广告插件、间谍软件入侵。     

紫外-光复活诱变香兰素生产菌株的研究

[目的]探究紫外诱变和光复活修复对生产香兰素菌株的效果。[方法]通过紫外诱变和光复活修复对香兰素生产菌链霉菌(Streptomycessp.L1936)进行复合诱变,筛选出香兰素高产菌株(Streptomycessp.L1936-9)。[结果]出发菌株经过紫外诱变和光复活修复处理后,脱乙酰酶酶活提高了71.1%,香兰素氧化酶酶活降低了34.6%相应的香兰素产量提高了34.2%。[结论]该研究为香兰素生产提供了良好途径。     

紫外分光光度法测定琥乙红霉素可溶性粉中琥乙红霉素的含量

琥乙红霉素(EES)是红霉素(EM)的琥珀酸乙酯,是大环内酯类抗生素,其酯化物在体内水解后释放出EM而起作用,临床主要用于细菌感染和支原体感染等疾病的治疗,在养殖业应用广泛。有关EES含量的测定,《中国药典》2000版和《山东省兽药质量标准》2002版中均规定采用抗生素微生物检定法     

新能源电池扫描可燃冰成为替代能源新热点

高效染料敏化太阳能电池 染料敏化太阳能电池能使太阳能更便宜，这种电池比传统的硅太阳能电池成本更低，而且更容易印在柔软的表面，但也存在一个问题，制造这类高效的电池需要由贵重的金属钌和易挥发的电解液制成染料。前不久，中科院长春研究所的王鹏和同事用另外两种原料研制出了一类新的染料敏化太阳能电池，新电池不仅更高效，而且更便宜、更经久耐用。     

Genome-wide search for segregation distortion loci associated with the expression of complex traits in Populus tomentosa

Segregation distortion of molecular markers has been reported in a broad range of organisms. It has been detected in an interspecific BC1 Populus pedigree established by controlled crossing between clone “LM50” (Populus tomentosa) and its hybrid clone “TB01” (P. tomentosa×P. bolleana). The study with a total of 150 AFLP markers (approximately 18.9% of the total loci) exhibited significant deviation from the Mendelian ratio (1:1) (p<0.01). Twenty-five percent of the markers were mapped on the pa-rental specific genetic linkage maps of clones “LM50” and “TB01” with a pseudo-test-cross mapping strategy. Twelve linkage groups had markers with skewed segregation ratios, but the major regions were on linkage groups TLG2, TLG4 and TLG6 in the linkage map of clone “LM50”. We also analyzed the association between distorted loci and expression of complex traits with Map-maker/QTL software. A total of 16 putative QTLs affecting 12 traits were identified in the distorted regions on seven linkage groups. Therefore we could detect the distribution of skewed loci along the entire genome and identify the association between quantitative traits and segregation loci via genetic mapping in an interspecific BC1 P. tomentosa family. Furthermore, the genetic nature and pos-sible causes of these segregation distortions for differentiation between female and male parents were also discussed.     

国家自然科学基金委员会资助花卉项目扫描

国家自然科学基金委员会（NNSV）2004～2008年在观赏园艺和园林植物两个学科共资助花卉研究项目84项（见下表）。简单归纳可发现这些项目有4个明显特点。