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There are three copies of R fragment in the S mt-genome, and each copy contains two closely adjacent open reading frames: orf355 and orf77. Among these three copies two BamHI fragments were cloned, and the sequence analysis showed that cox1 and cox2 gene lies upstream of the R region in each fragment, respectively. However, they locate in different strands and head to head with R. In this study, we found that:(1) The expression of cox1 and cox2 is not affected by the transcription of R region;(2) The two copies of R region transcribe in large amount in the microspores, and produce transcripts of 1.6kb and 2.8kb, respectively, in the sterile microspores; However, the abundance of these two transcripts is reduced in the fertility restored microspores, realized through the mRNA decay, and this reduction occurs at the uninucleate microspore stage;(3) In the sterile microspores, the 5 terminus of the 1.6kb transcript contains a palindrome region that can fold into a stem-loop.

本研究发现:(1) cox1和cox2的转录没有受到R区转录的影响;(2)两个拷贝的R区在在不育花粉中高丰度表达,其转录本大小分别为1.6kb和2.8kb;而在育性恢复的花粉中,这两个转录本的丰度被大大降低,进一步分析表明这一结果是通过mRNA分子的降解途径来实现的,此降解过程发生在单核花粉期;(3)在不育花粉中,1.6kb转录本的5′末端具有一段可形成茎环结构的迴文对称序列,而在可育花粉中,其5′末端短缺了9个碱基;(4)在不育花粉和育性恢复的花粉中,R区转录本的加尾位点都集中位于一个3′茎环结构之后;(5)不管是在不育花粉还是育性恢复的花粉中,orf77区域内均在第52位和100位核苷酸处发生了不同频率的C向U的编辑,从而形成UGA终止密码;(6)不管是orf55-orf77的成熟转录本还是转录前体分子,都已被加上了Poly尾巴,表明已进入降解途径;在以上实验结果的基础上,本研究对S型CMS花粉育性的恢复机理进行了如下推测:在不育花粉和育性恢复的花粉中,orf77区域内均发生了终止编辑,即由RNA编辑产生了提前终止密码子。

Nowadays most of researches on the multicast routing are how to generate multicast tree. In case of multicast tree failure, there need to re-route all of nodes behind the failure point so much as re-build the whole tree, this will deteriorate Quality-of-Service, on the other hand, it is insufferable in some multicast applications. We proposed a Fault-Tolerant multicast scheme to resolve this problem. Our scheme creates backup paths crosswise in the ramose node. It can reduce additional cost greatly and recover the failure of multicast tree rapidly.

现在关于多播路由的研究大多着眼于多播树的生成,一旦多播树出现故障,就需要对故障点以下的所有多播接收节点进行重新路由甚至对整个多播树进行重新构造,这一方面降低了服务质量,另一方面有些多播应用不允许长时间的中断,对此本文提出了一种多播容错方案,采用在分枝节点之间建立备份路径的措施,可以在很大程度上减少额外的代价,能够在最快的时间内恢复多播树的故障,并使得恢复后的多播树形状基本上没有改变。

Nowadays most of researches on the multicast routing are how to generate multicast tree. In case of multicast tree failure, there need to re-route all of nodes behind the failure point so much as re-build the whole tree, this will deteriorate Quality-of-Service, on the other hand, it is insufferable in some multicast applications. We proposed a Fault-Tolerant multicast scheme to resolve this problem. Our scheme creates backup paths crosswise in the ramose node. It can reduce additional cost greatly and recover the failure of multicast tree rapidly.

现在关于多播路由的研究大多著眼于多播树的生成,一旦多播树出现故障,就需要对故障点以下的所有多播接收节点进行重新路由甚至对整个多播树进行重新构造,这一方面降低了服务质量,另一方面有些多播应用不允许长时间的中断,对此本文提出了一种多播容错方案,采用在分枝节点之间建立备份路径的措施,可以在很大程度上减少额外的代价,能够在最快的时间内恢复多播树的故障,并使得恢复后的多播树形状基本上没有改变。

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响,结果表明,沉淀反应的适宜pH值大于11,苯甲醛与L-精氨酸的适宜摩尔比为1.25,(来源:Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上,氯化钠的存在对沉淀率基本上没有影响,而氯化铵和L-赖氨酸的存在使沉淀率下降;同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线,表明其最大平衡吸附量为30mg/g,考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响,结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2,温度对L-赖氨酸吸附率影响不大,吸附过程可在室温下进行,氯离子的存在使L-赖氨酸的吸附率降低。

A series of experiments were done to substantiate the feasibility of the different piezoelectric cochlea implants in vitro and in vivo . The unpoled ceramic had no piezoelectric characteristic and no ability to decrease the threshold, while the poled ceramic had obvious piezoelectric effect to recover the hearing. Based on these results, it can be affirmed that the piezoelectric cochlea implant can activate the nerve and decrease the threshold.

本研究通过未极化与极化的高灵敏性压电陶瓷的对比,从体外模拟实验中的声电响应曲线和动物体内植入实验的结果中得到:未极化的压电陶瓷没有压电响应,而极化后的压电陶瓷能够将声音信号转化为电信号,证实了压电陶瓷的压电特性的确可以刺激动物的听神经,从而降低听阈阈值。

A series of experiments were done to substantiate the feasibility of the different piezoelectric cochlea implants in vitro and in vivo. The unpoled ceramic had no piezoelectric characteristic and no ability to decrease the threshold, while the poled ceramic had obvious piezoelectric effect to rec

本研究通过未极化与极化的高灵敏性压电陶瓷的对比,从体外模拟实验中的声电响应曲线和动物体内植入实验的结果中得到:未极化的压电陶瓷没有压电响应,而极化后的压电陶瓷能够将声音信号转化为电信号,证实了压电陶瓷的压电特性的确可以刺激动物的听神经,从而降低听阈阈值。

Since H〓S and SO〓 adsorbed on TiO〓 could react with each other and TiO〓 is the medium of their electron transfer, thus SO〓 could not be adsorbed quite strong on the active site of TiO〓, which makes it more resistant to sulfating and increase the stability of catalyst. Finally, the model and mechanism of the reduction of SO〓 by NH〓 to elemental sulfur is advanced as follows: on the sulfide catalyst, ammonia is decomposed to N〓 and H〓, and H〓 reacts with SO〓 to form the intermedium of H〓S; then H〓S and SO〓 react as Claus reaction on TiO〓 catalyst.

反应系统中过量水蒸气的存在使催化剂表面某些活性位被水蒸气抑制使活性和选择性有较大幅度降低,但这种影响是可逆的,不会造成催化剂永久性中毒;另外当单质硫和水蒸气同时存在时,在〓催化剂上能够生成硫化氢和二氧化硫,而且由于硫化氢和二氧化硫化学吸附能力不同而导致它们的脱附顺序不同,硫化氢的生成温度总是低于二氧化硫的生成温度,说明过量水蒸气的存在会导致氧化物催化剂上逆克劳斯反应的发生;而在硫化物催化剂上几乎没有硫化氢和二氧化硫生成,说明硫化物催化剂能够抑制逆克劳斯反应的发生。

Sniper Ghillie suit have a good camouflage value, normal soldier skin does not.

比如你的站姿,AI对你的了解的值,天气和雾,和你所属的单位类型——狙击手的吉利服有专门的伪装属性定义,可以降低AI的探测度,但是普通士兵的衣服没有。

Basing on the results of examining the impact on price, liquidity and volatility of underlying stocks after warrant issuance, the paper concludes that:(1) the issuances of warrant has the temporary positive effects on the underlying stocks" price and the positive effects happen on the introduction day but not on the listing day.(2) The issuance of the warrants causes the underlying stocks" trading volume and amount increases and heighten their liquidity.(3) The issuance of the warrants has no impact on the system risk-β, but decreases the total risk and volatility of underlying stocks.

本文最后通过综合认购权证和认股权证发行前后标的股票价格,流动性和波动性的变化结果后,认为:(1)认股权证的发行对标的股票的价格有短暂地正的价格效应,而这种对标的股票正的价格效应发生在认股权证公告日而非上市日;(2)认股权证的发行促使标的股票的交易量和交易额的增加,提高了标的股票的流动性;(3)认股权证的发行对标的股票的系统风险即β值没有影响,但能降低标的股票的整体风险,减小标的股票的波动性。

The results indicated that the accumulation of Mn in the cell wall (accumulation rate as high as 36.34%) and the vacuole of the leaves (accumulation rate as high as 65.64%) might be one of the mechanisms of tolerance and hyperaccumulation of Polygonum hydropiper to Mn. Most Mn in leaves were the speciation of H2O-solubility organic salts or manganese oxalates. The content of chlorophyll a did not change under different Mn concentration treatments except that its content decreased remarkably when Mn concentration was 8000μmol/L in solutions. The membranes were not banned by Mn when its concentration was less than 5000μmol/L in solutions; Under different Mn concentrations of Mn, the content of their soluble proteins of leaves had changed at some stage. The activity of SOD and POD were gradually improved with the increasing of Mn concentration, which could eliminate activated oxygen free radical, This might be the other physiological mechanism of tolerance and hyperaccumulation of Polygonum hydropiper responding to Mn.

结果表明:锰在水蓼叶片非活性代谢部分的积累是其解毒耐锰的主要机制之一;水蓼叶片中的锰大部分以水溶性有机盐或草酸锰的形态存在;在锰浓度处理为8000μmol/L时,叶绿素a含量显著降低,而在其它处理条件下,叶绿素a无明显变化;在锰处理≤5000μmol/L时水蓼叶片的细胞膜还没有受到明显伤害;水蓼叶片的可溶性蛋白含量随锰处理浓度不同而变化,说明植物在代谢和结构上发生了调整;随锰处理浓度的增加,水蓼叶片SOD和POD活性提高,保护酶活性的提高又可清除活性氧自由基,这是水蓼耐高锰和累积锰的一种生理响应机制。

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