凉血活血方对肝星状细胞LX-2增殖和凋亡的影响

目的:探讨凉血活血方(LiangXue Huo Xue Fang)对肝星状细胞LX-2增殖和凋亡的影响。方法:体外培养肝星状细胞LX-2,分别将凉血活血方(浓度为1.125,2.228,3.31,4.37,5.41 mg·mL-1),作用于LX-2细胞后24 h,48 h用MTT比色法检测细胞的增殖情况,选取合适的药物浓度(4,8,12,16 mg·mL-1),用流式细胞术检测加药24 h后细胞的凋亡率。结果:1MTT法显示不同浓度凉血活血方作用LX-2细胞24 h,48 h后,除24 h,1.125 mg·mL-1和2.228 mg·mL-1外,其余组增殖抑制率均明显高于正常对照组(P0.05)。2流式细胞术检测显示,凉血活血方浓度为4,8,12,16 mg·mL-1)时,可明显促进LX-2细胞凋亡。结论:一定剂量的凉血活血方能抑制LX-2细胞的增殖,可能与其促进细胞凋亡有关。     

Symbolae ad floram mycologicam austriacam

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Symbolae ad floram mycologicam austriacam

Ohne Zusammenfassung     

Symbolae ad floram mycologicam austriacam

Ohne Zusammenfassung     

Symbolae ad floram mycologicam austriacam

Ohne Zusammenfassung     

Materiae ad Floram Filicum Sinensium

The present paper aims at validating a number of new taxa of the fern families Aspidiaceae, Lomariopsidaceae and Bolbitidaceae from tropical regions of China as part of Flora Reip. Pop. Sin. Vol. 5. The types of all taxa described here are preserved in the Herbarium,Institute of Botany, Academia Sinica, Beijing (PE).     

Spine routing in ad hoc networks

An ad hoc network is a multihop wireless network in which mobile hosts communicate without the support of a wired backbone for routing messages. We introduce a self organizing network structure called a spine and propose a spine-based routing infrastructure for routing in ad hoc networks. We propose two spine routing algorithms: (a) Optimal Spine Routing (OSR), which uses full and up-to-date knowledge of the network topology, and (b) Partial-knowledge Spine Routing (PSR), which uses partial knowledge of the network topology. We analyze the two algorithms and identify the optimality-overhead trade-offs involved in these algorithms. This revised version was published online in August 2006 with corrections to the Cover Date.     

Leptin extends the anorectic effects of chronic PYY(3-36) administration in ad libitum-fed rats

Acute administration of peptide YY(3-36) [PYY(3-36)] results in a reduction in food intake in several different vertebrates. However, long-term continuous administration of PYY(3-36) causes only a transient reduction in food intake, thus potentially limiting its therapeutic efficacy. We hypothesized that a fall in leptin levels associated with reduced food intake could contribute to the transient anorectic effects of continuous PYY(3-36) infusion and thus that leptin replacement might prolong the anorectic effects of PYY(3-36). Seven-day administration of 100 microg x kg body wt(-1) x day(-1) PYY(3-36) using osmotic minipumps caused a significant reduction in food intake of ad libitum-fed rats, but only for the first 2 days postimplantation. Circulating levels of leptin were reduced 1 day following continuous infusion of PYY(3-36), and combined leptin infusion at a dose of leptin that had no anorectic effects on its own (100 microg x kg body wt(-1) x day(-1)) prolonged the anorectic actions of PYY(3-36) in ad libitum-fed rats for up to 6 days postimplantation and yielded reduced weight gain compared with either peptide alone. The inhibitory effects of 100 microg x kg body wt(-1) x day(-1) PYY(3-36) on food intake were absent in rats refed after a 24-h fast and substantially reduced at a dose of 1,000 microg x kg body wt(-1) x day(-1) PYY(3-36). Leptin replacement was unable to recover the anorectic effects of PYY(3-36) in fasted rats. Our results suggest that an acute fall in leptin levels is not solely responsible for limiting duration of action of chronic PYY(3-36) infusion, yet chronic coadministration of a subanorectic dose of leptin can extend the anorectic effects of PYY(3-36).