三唑酮种衣剂在小麦种表的超微分布及抗脱落淋失研究

应用扫描电镜观察到三唑酮种衣剂（TriSCF）以具网眼结构的膜状物包被于小麦种子表面，膜状物厚度约4～7．5μm，种表包被率达95％；对照处理三唑酮可湿性粉剂（TriWP）拌种在小麦种表呈点状或片状零散分布，种表被药剂覆盖率低于80％。振荡试验中TriSCF包衣药剂脱落率为2％，显著低于TriWP干拌种（43％）或湿拌种（25％）。放射性同位素示踪检测表明，TriSCF包衣处理的小麦种子在17％含水量砂床上发芽1～7d内，保持种子内的14C-二唑酮放射性强度显著高于TriWP拌种处理，而然失到砂床上的14C-三唑酮放射性强度低开TriWP拌种处理。

三唑酮在小麦种表的超微分布观察(简报)

内吸性杀菌剂三唑酮广泛用于小麦及其他作物种子处理,可以有效地防治土壤中和地上部多种病菌对小麦种苗的侵染和危害。迄今为止,杀菌剂处理种子的方法已由传统的拌种方法发展到薄膜包衣和多层包衣(对小粒种子)新技术。国内对三唑酮用于小麦等种子的安全有效用量、在种苗上的吸收、传导和分布行为及药效开展了大量研究。

大鼠延髓网状背侧亚核内μ阿片肽受体的超微定位分布

本研究采用免疫电镜技术研究大鼠延髓网状背侧亚核内μ阿片肽受体样免疫反应阳性结构定位分布。电镜观察发现μ阿片肽受体样免疫反应产物主要附着在胞浆内膜性细胞器或囊泡的表面，许多树突尤其是小树突呈免疫阳性反应。由阴性的轴突与μ阿片肽受体免疫反应阳性的树突构成的不对称性轴一树突触是最常见的突触类型。另一方面很少见到μ阿片肽受体样免疫反应阳性神经元的胞体和轴突，因而很少观察到由μ阿片肽受体样阳性轴突和阴性（或阳性）树突构成的轴一树突触。然而我们偶尔发现 １例由 μ阿片肽受体样免疫阳性轴突与阳性轴突构成的轴－轴突触。本研究为μ阿片肽受体通过突触前和突触后调控机制参与阿片镇痛提供了形态学依据。

Picoplankton distribution in different water masses of the East China Sea in autumn and winter

Abstract Picoplankton distribution was investigated in different water masses of the East China Sea in November, 2006 and February, 2007. The autumn and winter cruises crossed three major water masses： the coastal water mass （CWM）, the mixed water mass （MWM）, which forms on the continental shelf, and the Kuroshio water mass （KWM）. Picoplankton composition was resolved into four main groups by flow cytometry, namely Synechococcus, Prochlorococcus, picoeukaryotes, and heterotrophic bacteria. The average abundances of Synechococcus, picoeukaryotes, and heterotrophic bacteria were （0.63＋ 10.88）~ 103, （1.61＋1.16）x103, （3.39~1.27）x105 cells/mL in autumn and （6.45~8.60）x103, （3.23~2.63）x103, （3.76~1.37）x 105 cells/mL in winter, respectively. Prochlorococcus was not found in the CWM and seldom observed in surface samples in either season. However, Prochlorococcus was observed in the MWM and KWM （approximately 103 cells/mL） in both auttman and winter. Synechococcus distribution varied considerably among water masses, with the highest levels in KWM and lowest levels in CWM. The depth-averaged integrated abundance of Synechococcus was approximately 5-fold higher in KWM than in CWM, which may be due primarily to water temperature. In the MWM, Synechococcus was resolved as two subgroups; the presence of both subgroups was more common in autumn. Picoeukaryote abundance varied less among water masses than Synechococcus, and heterotrophic bacteria depth-averaged integrated abundance exhibited the smallest seasonal variations with respect to water mass. Correlation analysis showed that relationships between picoplankton abundances and environmental factors （temperature, nutrients, and chlorophyll a） differed among the three water masses, suggesting that the three water masses have different effects on picoplankton distribution （particularly Synechococcus）.

Novel Tunable PMD Compensation Technology Using Linear Chirped Fiber Bragg Grating

Based on uniform fiber Bragg grating bonded with a magnetostrictive rod in the non-uniform magnetic field,a novel PMD compensation technique is proposed.This all-fiber PMD compensation technology is cost-effective and flexible in designing the differential group delay profile.

Distinguish on the viability of human umbilical cord mesenchymal stem cells using delayed luminescence

In this paper, we report the discrimination of the viability of human umbilical cord mesenchymal stem cells(hUC-MSCs) with photo-induced delayed luminescence(DL). We measure the DL decay kinetics of hUC-MSCs using an ultraweak luminescence detection system, and find the significant difference in the weight distributions of the decay rate for hUC-MSCs with high and low viabilities. Spectral discrimination of hUC-MSCs with high and low viabilities is thus carried out by comparing the DL kinetics parameters, including the initial intensity, the peak decay rate and the peak weight value. Our results show that the novel optical method for the viability diagnosis of hUC-MSCs has a promising prospect.