用PLD实现桶形移位器的功能

PLD器件具有灵活方便、设计周期短、保密性强等特点、可反映编程。     

Involvement of nitric oxide in the signal transduction of salicylic acid regulating stomatal movement

The effects and the relationship between sali-cylic acid(SA)and nitric oxide(NO) on Vicia faba L.stomatal movement were studied.The results here showed that exogenous SA and NO induced stomatal closure,100μmol/L SA induced a rapid and striking NO increase in the cytosol of guard cells.This phenomenon was largely prevented by 2000μmol/L 2-phenyl-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide(PTIO),a specific NO scavenger,and 25μmol/L N^G-nitro-L-Arg-methyl eater (L-NAME),an inhibitor of NO synthase(NOS) in mammalian cells that also inhibits plant NOS.In addition,SA-induced stomatal closure was largely prevented by PTIO and L-NAME.These results provide evidence that guard cells generate NO in response to SA via NOS-like activity,and that such NO production is required for full stomatal closure in response to SA.H-(1,2,4)-oxadiazole-[4,3-α]quinoxalin-l-one(ODQ),an inhibitor of guanylate cyclase,and nicotinamide,an antagonist of cADPR production,inhibited the effects of SA-and NO-induced stomatal closure.It suggests that both cGMP and cADPR might mediate the signal transduction of SA and NO-induced stomatal closure.     

Degradation of pyrene and characterization of<Emphasis Type="Italic">Saccharothrix</Emphasis> sp. PYX-6 from the oligotrophic Tianchi Lake in Xinjiang Uygur Autonomous Region,China

Bacterial strain PYX-6 that utilizes anthracene,phenanthrene, or pyrene for carbon and energy sources for growth was isolated from a non-polluted lake (Tianchi Lake) in Xinjiang Uygur Autonomous Region of China. Its morphology, physiological and biochemical properties, cell wall pattern and G C mol% content of DNA molecules were characterized. The 16S rRNA gene of strain PYX-6 was sequenced and analyzed for similarities to related bacterial species. Results indicated that strain PYX-6 is a member of the Genus Saccharothrix, and the strain was named Saccha-rothrix sp. PYX-6. When pyrene was the sole carbon source in cultural medium, the strain PYX-6 assimilated pyrene for growth and 0.005% of yeast extract stimulated pyrene degradation and assimilation. The optimal pH of cultural medium and the optimal shaking frequency during cultivation were 6-8 and 200 r/m, respectively. It was found that the disappearance of pyrene in medium occurred before significant growth of strain PYX-6 took place. Phthalic acid, benzylacetic acid, and benzylpropenoic acid were detected as catabolic intermediates during pyrene degradation with mass spectroscopy and this result indicated that Saccharothrix sp.PYX-6 adopted a pathway that is different from the pathway of the previously reported pyrene-degrading Mycobacterium sp. PYR-1.     

Viewpoints on the proinflammation state of leukemia

Proinflammation represents a pathophysiological state on the early stage of a number of diseases, especially the infectious and immunological ones. In recent years, proinflammation has attracted much attention, and the term 損roinflammation factors?appears frequently in the literature. While investigating leukemia and leukemic cells from the angle of 損roinflammation state? we got some intriguing findings, e.g. we detected the significantly elevated expression of proinflammation factor IL-18 in patients with acute myeloid leukemia (AML), which could up-regulate matrix metalloproteinases (MMP) and specific tissue inhibitors (TIMPs). The increased MMP may play a role in the aggressiveness of myeloid leukemic cells, and be associated with a poor prognosis. This phenomenon reflects an ignored aspect of leukemia. Investigations from the angle of 損roinflammation state?have broaden the fields of tumor and leukemia study.     

Interleaving distribution of multifractal strength of 16-channel EEG signals

Muitifractai characteristics of 16-channel human electroencephalogram (EEG) signals under eye-closed rest are analyzed for the first time. The result shows that the EEGs from the different sites on the scalp have different muitifractai characteristics and the muitifractai strength value △α exhibits a kind of interleaving and left-right opposite distribution on scalp. This distribution rule is consistent with the localization of function and the iateralization theory in physiology. So △α can become an effective parameter to describe the brain potential character. And such a △α stable distribution rule on sites of the scalp means a classic cerebral cortex active state.     

一类光滑小波严格框架的设计

从不等式≤1出发, 在假定低通滤波器和高通滤波器均未知的情况下来设计具有紧支撑的严格小波框架. 低通滤波器的未知使设计具有更大的自由度, 所得到的低通滤波器和高通滤波器都具有对称性或反对称性. 给出了奇数次和偶数次滤波器的算法, 并对长为4~7的严格小波框架给出了具体实例, 最后给出用它们分解图像的效果.     

生理学教学方法改革初步研究

本文针对生理学教学的特征,应用"以问题为中心"教学法,创设问题情景,以疑导学;应用多媒体技术结合启发式讲授法,解决教学中的难点,对高等医学教育的生理学教学方法改革进行了初步研究.     

享誉国际的神经生理学家——张香桐

中国科学院神经科学研究所名誉所长张香桐院士，是我国对神经生理贡献最大，最负国际盛誉的神经生理学家之一。他是神经元树突生理功能研究的先驱者，在机体各部位的肌肉在猴运动皮层的定位研究、肌肉传入神经纤维分类、视觉研究、针刺镇痛神经机制的研究等方面有重要建树，对我国神经科学的发展起到了重要的推动作用。美国1989年出版的《神经科学百科全书》中，张香桐被列为“公元前300年至公元1950年间对神经科学进展有贡献的人物”之一。     

生理学实验教学的探讨与思考

生理学实验课在生理学教学中占有举足轻重的地位,从近年来的教学中我们发现了许多问题,针对这些问题我们采取了相应的措施,取得了较好的效果.现总结如下,以供大家共同探讨生理学实验教学.