温度和GA_3对桃果实采后乙烯合成及桃ETR1同源基因表达的影响

为明确桃果实采后成熟衰老期间乙烯的合成与桃ETR1同源基因之间的关系,进一步了解乙烯的转导和作用过程,设计合成了桃ETR1扩增引物RTetr1和RTetr2,用RT-PCR方法研究了温度和GA3处理对白凤桃(Amyg-daluspersicaL.)果实采后乙烯生成和桃ETR1同源基因表达的影响。结果表明,低温处理降低了果实乙烯释放量,低温+GA3处理不仅降低了果实乙烯释放量,还延缓乙烯释放高峰期。PCR分析表明,桃ETR1的cDNA合成受温度和GA3调节,随着乙烯合成能力的增强,ETR1同源基因的表达水平增加,在乙烯信号转导过程中呈正向表达模式。     

贮藏条件对脱脂乳粉非酶褐变的影响研究

对脱脂乳粉在不同贮藏条件下（温度、水分活度、贮藏时间）的非酶褐变进行了实验研究，同时对贮藏温度T与脱脂乳粉玻璃化转变温度Tg的差值（T—T曲与非酶褐变指数之间的关系进行了探讨。结果表明：在较低的（T—T曲时脱脂乳粉的非酶褐变指数较小，但随着（T—T曲的增加，非酶褐变指数会迅速增加。随着贮藏温度的升高及水分活度的增加，脱脂乳粉的非酶褐变指数增大。贮藏时间对脱脂乳粉的影响很快会趋于平缓。     

草坪草种子活力的低温保存试验

用－３０℃、－１０℃、５℃和室内２０～２８℃（对照）对草地早熟禾、紫羊茅、高羊茅、剪股颖四种草坪草种子保存２００ｄ后分析得出,各草坪草种子要求冷藏温度不一样,恰当的低温保存可以保持原种子活力。草地早熟禾和剪股颖种子在－３０℃～－１０℃保存为好,紫羊茅以－３０℃为佳,而高羊茅在２００ｄ内无需冷藏。     

校园视频直播系统的设计与实现

很多学校经常举办大型的会议、论坛、名人讲座和文艺汇演,由于参加人数众多,经常会出现会议场地不够的情况.因此,建立规模适度、经济可行且先进可靠的校园视频直播系统是各学校都在寻求的解决方案.本文从实际出发来探讨校园视频直播系统的设计与实现.     

常规储藏过程中小麦烘焙品质变化机理的研究

研究了在室温常规储藏过程中小麦烘焙品质的变化和蛋白质各部分质和量的变化。结果表明，经过储藏小麦的烘焙品质有所改善，且在达到工艺后熟时最佳，随后有所下降。在储藏过程中，小麦蛋白质各部分的质和量均发生了变化，并与烘焙品质的变化具有一定的相关性。由此可以推测，小麦烘焙品质的变化可能是由于小麦蛋白质的质和量布的变化引起的。     

Evaluation of ovum storage techniques for reproductive studies of fishes

Abstract– We compared dry masses of mature oocytes and ripe eggs from Etheostoma lynceum and Etheostoma caeruleum that were stored in varying concentrations of either formalin or isopropyl alcohol. In comparison to 10% formalin, alcohol significantly reduced the weights of both mature oocytes and ripe eggs, with 25% isopropyl alcohol resulting in much smaller reductions than 50% isopropanol. Three percent formalin resulted in smaller decreases in the masses of oocytes and eggs than the alcohol treatments, and not all comparisons with 10% formalin were significantly different. We recommend fixing specimens and storing them and gametic cells removed from them in 10% formalin. In cases where specimens or eggs in alcohol must be used in addition to material in formalin, correction factors (to formalin standard) should be developed, but the correction should not be made uncritically due to the varying effects alcohol may have among samples.     

水貂细小病毒性肠炎灭活疫苗保存期试验

对2~8℃条件下保存90,120,150,180,210,240,300,360 d的水貂细小病毒性肠炎灭活疫苗接种水貂进行免疫试验,结果表明:保存300 d的疫苗接种水貂30 d后血清中水貂肠炎细小病毒(MEV)HI抗体均在1∶32以上,免疫水貂强毒攻击均获得100%保护,确定水貂细小病毒细胞灭活疫苗保存期为300 d。该结果为水貂细小病毒细胞灭活疫苗运输和保存提供了理论依据。     

一种新的机顶盒缓存控制算法

结合视频点播系统中的一种存储与传输技术，分析并介绍了一种机顶盒功能的实现方案，研究了机顶盒视频点播缓存控制问题并提出了一种控制算法。     

一种树的存储结构

采用静态数组的方式给出树的一种存储结构，并给出这种存储结构下的几种常用运逄的Ｃ语言程序，这种存储结构避开了链式存储结构中链域个数不定的困难，容易用ＦｏｘＢＡＳＥ等关系型数据库来实现相应的运算，可以将二叉树与树统一起来处理。     

Tree Diversity,Carbon Storage,and Soil Nutrient in an Old‐Growth Forest at Changbai Mountain,Northeast China

Abstract

The study of plant diversity and its role in ecosystem functioning is becoming a central issue in ecology. The relationships between carbon storage and tree diversity of natural forest at small scale are still unclear. This research investigated these relationships in an old‐growth forest at Changbai Mountain, Northeast China. It was found that at small scale, tree carbon storage generally increases with increasing tree species richness, but for stands with same species richness, tree carbon storage varies dramatically. At the small scale, tree species evenness has a significantly linear relationship with nature logarithm of total tree carbon storage. The stand carbon storage of trees is mainly controlled by stand tree composition. Fraxinus mandshurica, Pinus koraiensis, Quercus mongolica, Tilia amurensis, and Acer mono contribute more than 85% of stand carbon storage of trees. Stands with similar tree composition at small scale have different soil organic carbon storage and nutrient contents. Tree species evenness has great impact on soil N content at the soil horizon less than 30 cm deep, but its impacts on C/N, P, K, and S contents are small. Tree density has a negative linear relationship with soil organic C and C∶N ratio at the soil horizon is less than 30 cm deep. The implication of our findings here for carbon sequestration in the Kyoto Protocol is also discussed.