心电心向量同步仪的研制

本文介绍一种以３８６计算机为核心的心电心向量同步仪。阐述了仪器的工作原理、硬件组成、软件设计。     

Genes of Hippo signaling network act unconventionally in the control of germline proliferation in Drosophila.

Hippo pathway and its related genes are required for growth control in various somatic tissues. The mutations of Hippo pathway components lead to tissue overgrowth cell-autonomously. Surprisingly, when we generated germline mutant clones of Hippo-network genes such as fat, expanded, hippo, salvador, and warts, we did not observe any overgrowth of these mutant cells. Consistently, overexpression of the progrowth gene yorkie, which is normally inhibited by Hippo signaling, did not lead to germline overgrowth either. In contrast to previous studies in epithelial tissues, these tumor suppressor genes are dispensable in germline cells for their proliferation control. Furthermore, we demonstrate that expanded functions nonautonomously to regulate spermatogonial proliferation. It appears that expanded acts from the somatic support cells surrounding the germline to restrict spermatogonial amplification.     

Human monocyte-derived hemangioma-like endothelial cells: evidence from an in vitro study

BACKGROUNDS: Hemangiomas are highly prevalent in newborns and infants and can lead to severe complications. However, the pathogenesis of hemangiomas is still unknown. This study was designed to examine the potential of human monocytes to differentiate into hemangioma endothelial cells. METHODS: Purified monocytes from adult human peripheral blood were cultured under a conditional culture environment supplemented with basic fibroblast growth factor and vascular endothelial growth factor. Cells cultured for 2 weeks were subjected to histological and immunochemical examinations in order to determine the expression of specific markers for hemangioma endothelial cells. RESULTS: Monocytes cultured for 2 weeks in angiogenic medium expressed human erythrocyte-type glucose transporter protein, FcgammaRII, and several other endothelial markers, all of which are deemed specific markers for hemangioma endothelial cells. However, neither CD133 nor alpha smooth muscle actin was detected in our monocyte culture. CONCLUSION: Our data suggested that monocytes are capable of differentiating into hemangioma endothelial cells under the angiogenic stimulation from microenvironment of proliferative hemangioma.     

Exact BPF and FBP algorithms for nonstandard saddle curves

A hot topic in cone-beam CT research is exact cone-beam reconstruction from a general scanning trajectory. Particularly, a nonstandard saddle curve attracts attention, as this construct allows the continuous periodic scanning of a volume-of-interest (VOI). Here we evaluate two algorithms for reconstruction from data collected along a nonstandard saddle curve, which are in the filtered backprojection (FBP) and backprojection filtration (BPF) formats, respectively. Both the algorithms are implemented in a chord-based coordinate system. Then, a rebinning procedure is utilized to transform the reconstructed results into the natural coordinate system. The simulation results demonstrate that the FBP algorithm produces better image quality than the BPF algorithm, while both the algorithms exhibit similar noise characteristics.     

HPLC法测定清火栀麦片中穿心莲内酯的含量

【目的】建立清火栀麦片中穿心莲内酯的含量测定方法。【方法】ＨＰＬＣ法,以甲醇－水（５０：５０,ｐＨ＝４．５）为流动相,检测波长为２２５ｎｍ。【结果】加样回收率为９８．４％,ＲＳＤ＝２．０３％。【结论】该法测定结果准确,精密度、重现性均好,可用于该产品的质量控制。     

海水淹溺肺水肿兔血浆MDA和SOD的变化

目的 :观察海水淹溺肺水肿 (PE SWD)兔血浆中丙二醛 (MDA)和超氧化物歧化酶 (SOD)变化规律 ,探讨上述两项指标发生变化的原因和机制。方法 :用核黄素光照法和硫代巴比妥酸法 ,对PE SWD兔动脉血浆MDA和SOD进行定量检测和动态观察。结果 :灌海水后 30min ,MDA和SOD较灌海水前均显著升高 ,尔后两者均逐渐下降 ,但仍远远高于灌海水前。结论 :PE SWD发生发展过程中 ,MDA的损害性作用使肺泡表面活性物质表面特性发生改变 ,影响了正常的呼吸功能 ,并掩盖了SOD的保护性作用。     

仁术健胃颗粒逆转胃癌前期病变的临床研究

目的观察仁术健胃颗粒对胃癌前病变的逆转作用。方法将１２０例符合诊断标准的胃癌前期病变患者,随机分为仁术健胃颗粒治疗组８０例和胃复春对照组４０例进行临床疗效观察。结果①综合疗效：治疗组总有效率为９１．２５％,对照组为７５．００％,经统计学处理,差异有显著性（Ｐ〈０．０５）;②治疗组胃镜及对萎缩、肠化、异型增生的疗效分别为７１．２５％、７７．５０％、７９．４９％、８８．４６％,对照组为５２．５０％、６     

鼻咽癌茎突后间隙侵犯的临床意义探讨

目的 探讨鼻咽癌茎突后间隙侵犯的临床意义。方法 １９９２年１２月～１９９３年１２月１９８Ⅰ－Ⅳａ期鼻咽癌住院初治患者接受受根治性放射治疗。按茎突后间隙有无侵犯分为茎后侵犯组和茎后无侵犯组。应用Ｋａｐｌａｎ－Ｍｅｉｅｒ,Ｌｏｇ－Ｒａｎｋ及卡方检验等方法对两组患者５年生存率、局部控制率和无远处转移生存率进行分析和评价。结果两组患者口咽侵犯率分别为７２．１％和１６．８％（Ｐ〈０．００１）,后组颅神经侵犯     

抗凝血酶Ⅲ、纤溶酶原激活剂抑制剂-1在2型糖尿病肾病中的作用

目的:通过测定糖尿病肾病患者血中抗凝血酶(AT-Ⅲ)含量(AT-Ⅲ:Ag)、抗凝血酶活性(AT-Ⅲ:A)水平、纤溶酶原激活剂抑制剂(PAI-1)活性水平,并与正常人、糖尿病非肾病患者进行比较,分析研究与白蛋白排泄率(AER)的关系,以冀了解(1)AT-Ⅲ、PAI-1在糖尿病肾病中的状态,探讨它们在糖尿病肾病发病中的可能机理;(2)为临床预防和治疗糖尿病肾病提供理论依据和方法.方法:应用发色底物法测定血浆中PAI-1和AT-Ⅲ:A,应用免疫比浊法测定血清中AT-Ⅲ:Ag含量,应用放射免疫法测定AER.结果:(1)PAI-1、AT-Ⅲ:Ag、AG/A水平以糖尿病肾病组最高,依次为糖尿病非肾病组、对照组;AT-Ⅲ:A以对照组较高,糖尿病非肾病组次之,糖尿病肾病组水平最低;(2)相关性分析显示,糖尿病肾病组中PAI-1与AT-Ⅲ:A呈显著负相关,与Ag/A呈显著正相关,与AT-Ⅲ:Ag无相关,与AER呈显著正相关.AT-Ⅲ:Ag与AT-Ⅲ:A无相关,与Ag/A呈显著正相关.AT-Ⅲ:A与AER、Ag/A呈显著负相关.糖尿病非肾病组中PAI-1,AT-Ⅲ:A,AT-Ⅲ:Ag与Ag/A间的相关性同前.结论:(1)糖尿病存在着高凝、低纤溶状态,并发肾病时进一步加重;(2)AT-Ⅲ:A、PAI-1均与肾脏损害程度密切相关,二者互为关联,共同介导了糖尿病肾病的发生;(3)通过调节凝血、纤溶系统以达到新的动态平衡,有可能延缓或防止糖尿病肾病等微血管并发症的发生或发展.