Research at channel level on the effect of LaCl3 on Radish (Raphanus satirus L.) vacuolar membrane

We recorded slow vacuolar (SV-type) channel currents of Radish vacuoles successfully for the first time by using the whole-vacuolar patch-clamp recording mode. SVtrye currents would increase and threshold potentials of activation would shift towards more negative values with the increase of concentrations of cytosolic Ca2+. When 2.5 mmol/L LaCl3 and 4 mmol/L EGTA were added to bath solutions,SV-type currents were suppressed remarkably. Then adding LaCl3 with different concentrations to pipette solutions, we found that LaCl3 with higher concentrations (＞ 4 × 10-7 mol/L)had a strong inhibitory effect on SV-type currents, while LaCl3 with lower concentrations (≤4 × 10-7 mol/L) promoted channel currents. This promoting effect provides an important basis at channel level for researching further the effects of rare earth on physiological activities of plants and the production-increase effects of rare earth fertilizers on crops.``     

Thermoelectric power and carrier concentration of La2−xSrxCuO4(0.03 <x <0.17) single crystals

Thermoelectric power (S) measurements have been systematically investigated in high-quality La2-x-Srx-CuO4 single crystals with different Sr concentrations (x =0.03, 0.05, 0.07, 0.1, 0.12). In this doping range studied, S remains positive, and with the increase of Sr concentration,room-temperature thermoelectric power S (290 K) decreases.An empirical formula which presents a relationship between hole concentration P and room-temperature thermoelectric power S (290 K) is reported in this note. Based on the theory of metallic diffusion model, the experimental results are discussed.     

Study of transmembrane La3+ movement in rat ventricular myocytes by the patch-clamp technique

We have studied transmembrane La3+ movement in rat ventricular myocytes for the first time by using the whole-cell patch-clamp recording mode. La3+ (0.01-5.0 mmol/L) could not bring out inward currents through the L-type calcium channel in rat ventricular myocytes, while it could enter the cells by the same way carried by 1μmol/L ionomycin. When the outward Na+ concentration gradient is formed, La3+ can enter the cells via Na-Ca exchange, and the exchange currentsincrease with the increase of external La3+ concentrations. But compared with Na-Ca exchange currents in the same concentration, the former is only 14%-38% of the latter. The patch-clamp experiment indicates that La3+ normally can not enter ventricular myocytes through L-type calcium channel, but it can enter the cells via Na-Ca exchange.     

燃煤在O_2/CO_2方式下SO_2生成特性的研究

研究了合山煤在O2 /CO2 方式下SO2 的生成特性 .结果表明在O2 /CO2 方式下 ,由于燃煤的燃烧特性和钙基吸收剂的煅烧分解特性不同于传统燃烧方式 ,SO2 的生成速度加快 ,生成量较空气气氛下大为减少 ,钙基吸收剂的脱硫率随温度升高而增加 ,表明O2 /CO2 方式有利于钙基吸收剂高温脱硫     

氨基酸席夫碱锌配合物的合成与表征

对水溶液中酪氨酸缩水杨醛席夫碱和Zn2 现场配位进行了研究,合成了Zn2 席夫碱配合物3种,通过元素分析确定其组成分别为配合物1:Zn·L·Bipy·KAc;配合物2:Zn·L·Phen·0.5H2O;配合物3:Zn·L5·Ap·kAc·1.5H2O.通过可见紫外吸收光谱分析、红外光谱分析、热重分析对这些配合物进行了表征.     

非酸催化合成3,9-二苯基-2,4,8,10-四氧杂螺[5,5]-十一烷

利用苯甲醛与季戊四醇在非酸催化剂的作用下 ,合成了聚缩醛螺胞二醚的先导化合物3,9-二苯基 - 2 ,4,8,1 0 -四氧杂螺 [5 ,5 ]-十一烷 .考察了催化剂、反应物的摩尔比、带水剂、反应温度等对反应的影响 .利用FTIR、TG及HNMR对标题化合物的结构进行了表征 ,产品的最高收率可达 88%以上 .     

超临界CO2萃取啤酒花及其应用

对啤酒花的超临界CO2萃取物的组分进行了分析，气相色谱图表明了超临界CO2和液态CO2萃取物的异同；并对超临界CO2萃取物进行酿酒试验，结果表明超临界CO2萃取物不仅增加啤酒香味，还能改善口味。     

纳米 SnO2 基 CO 敏感元件的研究

采用沉淀法制备了SnO2纳米粉体，并制作了烧结型的CO敏感元件，考察了掺杂元素的种类和含量及烧结温度对敏感元件灵敏度的影响，为获得性能良好的CO气敏元件，需要最佳的制备方法和最好的掺杂剂。     

SIP和PCG2两种迭代法在地下水数值计算中的应用对比

对两种目前最受地下水工作者喜欢的数值迭代法SIP和PCG2做一对比 ,主要分析了这两种方法的原理及其使用效果的差异 ,并结合简单的实例进行验证 ,得出结论 :SIP法在方法本身和人为操作两方面都具有难以避免的不精确 ,而PCG2法则就这两方面而言却是一种行之有效、精确性极高的数值迭代法 ,而且在地下水数值计算领域具有很高的推广价值。     

一种改进的点定位算法

通过对传统的点定位算法——奇偶法则算法的分析 ,提出了一种改进的奇偶法则的实现算法 .在改进算法中 ,从待判定点引出的射线定义为与 x轴平行且与其同向 ,对射线与区域边界边的相交情况进行了分类处理 .通过分析射线与边界边的位置关系 ,只有少数情况需要计算其交点 ,而大部分情况只需简单比较即可得出相交情况 .当射线穿过两条相邻边界边的交点时 ,根据定义的法则 ,只进行一次相交情况的判定 .因此 ,改进算法减少了计算交点的次数 ,提高了点定位的效率 .最后通过实际应用 ,对传统算法与改进算法在同样条件下的处理时间进行了比较