一次烧成施釉彩陶制品

采用当地粘土合成了一次烧成施釉彩陶制品用坯料 ,研究了坯体和釉层的形成特点 ,并确定了制品的温度时间参数     

Structurally Diverse Polyamines: Solid‐Phase Synthesis and Interaction with DNA

A versatile solid‐phase approach based on peptide chemistry was used to construct four classes of structurally diverse polyamines with modified backbones: linear, partially constrained, branched, and cyclic. Their effects on DNA duplex stability and structure were examined. The polyamines showed distinct activities, thus highlighting the importance of polyamine backbone structure. Interestingly, the rank order of polyamine ability for DNA compaction was different to that for their effects on circular dichroism and melting temperature, thus indicating that these polyamines have distinct effects on secondary and higher‐order structures of DNA.     

Thermodynamic mechanism of free heme action on sickle cell hemoglobin polymerization

For insights into the mechanisms of heme action on the rate of sickle cell hemoglobin polymerization, we determine the erythrocytic concentration of free heme using a novel method based on enzymatic catalysis and luminescence. We find in sickle cell patients 44 ± 10 µM, in sickle trait individuals, 33 ± 4 µM, and in healthy adults, 21 ± 2 µM. We test the applicability of two mechanisms of heme action: a kinetic one, whereby heme aggregates serve as heterogeneous nucleation centers, and a thermodynamic pathway, in which free heme enhances the attraction between sickle hemoglobin (HbS) molecules in solution. We show that the latter mechanism exclusively operates. The enhanced attraction leads to increase of the total volume of a population of dense liquid clusters by about two orders of magnitude. As the dense liquid clusters serve as locations and precursors to the formation of the HbS polymer nuclei, their increased volume directly leads to faster polymer nucleation. © 2015 American Institute of Chemical Engineers AIChE J, 61: 2861–2870, 2015     

单聚合物复合材料研究进展

综述了单聚合物复合材料的种类、制备方法及其研究现状,着重分析了各种制备方法的优缺点,最后就单聚合物复合材料的前景进行了展望。指出聚砜酰胺基单聚合物复合材料玻璃化转变温度高于300℃,热分解温度超过420℃,热稳定性和阻燃性能均优异,有望成为新一代航空材料;借助静电纺丝技术使材料纳米或微米化,其制备的单聚复合材料力学性能有大幅提高;单聚合物复合材料在航空航天、汽车工业等领域的应用是今后的研究重点;单聚合物复合材料在生物领域有很大的应用前景。     

增效过磷酸钙的增效机制及其对玉米生长的影响

利用猪毛、风化煤和腐植酸钠的水解液为增效剂制备了一种增效过磷酸钙,探讨了增效过磷酸钙的增效机制及其对玉米生长的影响。结果表明,蒸馏水浸提条件下,增效过磷酸钙能减缓水溶磷的释放,具备较高的pH值缓冲性。与普通过磷酸钙相比,增效过磷酸钙处理的玉米生物量平均增加了41.9%,吸磷量和吸钙量分别增加了61.7%和27.8%,根系活力增加了24.3%。该研究结果对过磷酸钙生产的技术改进具有指导意义。     

烷氧基化法一步合成丙烯酸乙氧基乙酯

采用镁铝固体催化剂催化环氧乙烷开环并插入丙烯酸乙酯(EA)的酯基中一步合成丙烯酸乙氧基乙酯(EEA),研究了催化剂中镁铝金属阳离子比例、催化剂焙烧温度等对催化剂活性的影响,采用SEM分析了催化剂形貌特征,经FTIR表征确认目标产物EEA结构。同时优化了烷氧基化法合成丙烯酸乙氧基乙酯的工艺条件。研究结果表明:在n(Al3+)/n(Mg2+)=0.8、焙烧温度为500℃的条件下,制备的催化剂活性最高;丙烯酸乙酯与环氧乙烷摩尔比为3∶1、反应温度130℃、催化剂用量为原料总质量1.5%的条件下,EO转化率接近70%,EEA选择性为57.59%,DEEA选择性为25.29%,TEEA选择性为11.54%。     

一步法合成脲甲醛缓释肥的研究

研究了强酸环境下加入粉状磷酸一铵一步法合成脲甲醛缓释肥的工艺。在固定磷酸一铵加入量为30 g、n(尿素)/n(甲醛)=1.4时,该体系适宜的工艺条件为反应温度40℃、p H 1.0,此时氮转化率为84.19%,产品中w(P2O5)为9.55%,AI值为23.45%。该工艺反应温度低,速度快,可以节约能源,提高生产效益。     

Identification of Specific Variations in a Non-Motile Strain of Cyanobacterium Synechocystis sp. PCC 6803 Originated from ATCC 27184 by Whole Genome Resequencing

Cyanobacterium Synechocystis sp. PCC 6803 is a widely used model organism in basic research and biofuel biotechnology application. Here, we report the genomic sequence of chromosome and seven plasmids of a glucose-tolerant, non-motile strain originated from ATCC 27184, GT-G, in use at Guangzhou. Through high-throughput genome re-sequencing and verification by Sanger sequencing, eight novel variants were identified in its chromosome and plasmids. The eight novel variants, especially the five non-silent mutations might have interesting effects on the phenotype of GT-G strains, for example the truncated Sll1895 and Slr0322 protein. These resequencing data provide background information for further research and application based on the GT-G strain and also provide evidence to study the evolution and divergence of Synechocystis 6803 globally.     

企业内110kV总降压站设计要则

结合110kV总降压站设计中的体会,根据规程要求和企业现有系统状况,从安全可靠性,经济实用性,操作可控性等方面考虑,论述了总降压站设计中的站址选择,站区布置,供电系统的确定,设备选择,监控系统等要点,着重论述了继电保护的设计原则和设置要求。