小鼠补体受体Ⅱ型基因改造后感染EB病毒

通过对小鼠补体受体Ⅱ型基因（CR2）进行定点突变,然后将野生型和突变型小鼠CR2/1（MCR2/1）及人CR2（hCR2)用电穿孔方法导入小鼠SP2/0进行表达,采用免疫组织化学等方法鉴定阳性细胞系。用EB病毒对转染阳性细胞进行感染,EBER-1杂交结果显示,仅转染hCR2和突变型MCR2（mtMCR2)的SP2/0细胞感染了EB病毒,前者感染EB病毒的阳性率较后者高很多。这为进一步研究EB病毒进入细胞的机制及建立EB病毒相关的鼻咽癌动物模型奠定了良好的基础。     

假鹰爪化学成分研究(Ⅱ)

目的：寻找番荔枝科假鹰爪属植物假鹰爪Ｄｅｓｍｏｓ ｃｈｉｎｅｎｓｉｓ抗肿瘤活性成分。方法：采用硅胶柱色谱分离化学成分。根据理化性质及波谱分析等方法鉴定结构。结果：从氯仿萃取物中分离鉴定了７个化合物,分别是ｕｎｏｎ－ａｌ（Ⅰ）,黄芩素－７－甲醚（Ⅱ）,去甲氧杜鹃花素（Ⅲ）,去甲氧杜鹃花素－７－甲醚（Ⅳ）,苯甲酸（Ⅴ）,β－谷甾醇（Ⅵ）和豆甾醇（Ⅶ）。结论：该种植中鉴定的黄酮类化合物均为β－环未取代,     

中国假鹰爪属植物资源调查与原植物鉴定△

通过文献考查、原植物实地考察和标本采集 ,以及国内各大植物标本馆馆藏标本查阅 ,基本弄清了我国假鹰爪属植物种类及分布情况。为开发利用该属植物资源、正确进行该属植物种级水平分类鉴定提供科学依据     

肾上腺切除对强迫游泳大鼠吗啡成瘾行为的影响

为探索应激和肾上腺切除在药物成瘾行为中的作用机制 , 将40只雄性Wista r大鼠随机分为肾上腺切除组、糖皮质激素Ⅰ组(肾上腺切除+氢化考的松20mg/kg)、糖皮质激素Ⅱ组(肾上腺切除+氢化考的松40mg/kg)及生理盐水对照组,每组各10只, 观察肾上腺切除及给予糖皮质激素对强迫游泳大鼠条件性位置偏爱形成的影响.结果: ①肾上腺切除组动物在药物搭配侧箱体中停留的时间与在对侧箱体中停留时间相比无明显差异(t=1.84 , P＞0.05),而其它3组中均存在显著性差异(P＜0.05或P＜0.01);②与其它3 组相比,肾上腺切除组动物在药物搭配侧箱体中停留时间明显缩短,而其它3组之间则无明显差异.由此表明,切除肾上腺能够减弱强迫游泳对大鼠吗啡条件性位置偏爱的强化作用, 而给予外源性糖皮质激素能够逆转这种作用.     

FITC—PSA荧光标记法在检测人精子顶体结构中的应用

目的：探讨ＦＩＴＣ－ＰＳＡ荧光标记法在检测人精子顶体结构中的临床应用价值。方法：应用络合异硫氰酸荧光素的碗豆凝集素（ＦＩＴＣ－ＰＳＡ）进行精子顶体荧光标记,分别测定５８例不育患者及４６例正常生育男子的精液标本,比较两组间精子顶体完整率的差异。结果：正常生育组的精子顶体完整率显著高于不育组（Ｐ〈０．０１）。结论：ＦＩＴＣ－ＴＳＡ荧光标记法操作简单,技术结果可靠,特异性强,可作为评价人精子授精能力的一     

腹膜透析对可溶性细胞间粘附分子-1水平的影响及其意义

目的：探讨腹膜透析对可溶性细胞间粘附分子－１（ｓＩＣＡＭ－１）水平的影响及其在长期透析患者免疫功能下降中的作用。方法：采用夹心ＥＬＩＳＡ方法分别检测感染期、非感染期连续不卧床腹膜透析（ＣＡＰＤ）患者血清及腹膜透析液中ｓＩＣＡＭ－１水平的变化。结果：与非感染期ＣＡＰＤ患者相比,感染期ＣＡＰＤ患者血清ｓＩＣＡＭ－１水平显著降低,腹透液ｓＩＣＡＭ－１水平明显升高（Ｐ〈０．０１）;治疗后血清及腹透液ｓＩＣＡＭ－１水平,均较治疗前显著升高或降低（Ｐ〈０．０１）。结论：ｓＩＣＡＭ－１在感染期ＣＡＰＤ患者血清及腹透液中的变化,可能损害了巨噬细胞的正常粘附能力,从而降低机体的免疫能力。     

糖耐量减低患者的干预治疗

目的研究二甲双胍是否能阻止糖耐量减低(IGT),患者转变为2型糖尿病(DM)及其安全性和有效性.方法56例住院时经OGTT证实为IGT的病人,给二甲双胍250mg,每日3次.观察1～2周后的空腹及餐后2小时血糖.出院治疗1年后随访复查OGTT.结果56例患者治疗1～2周后空腹血糖由5.88±1.20mmol/L降到4.35±1.30mmol/L,餐后2小时血糖由9.20±0.5mmol/L降到5.80±2.11mmol/L(P＜0.01).1年后随访到34例病人,其中14例坚持服药到随访时(治疗组),20例仅服药1～3月后停药(对照组).两组复查OGTT结果,对照组OGTT正常者3例(15.0%),仍为IGT者15例(75.0%),转变为DM者2例(10.0%);治疗组OGTT正常者8例(57.2%),仍为IGT者6例(42.8%),无转变为DM者,无低血糖症发生.结论二甲双胍长期服用可阻止IGT病人恶化为DM,此药安全、有效、不易发生低血糖,易被接受长期服用.但我组病人少尚需继续观察.     

红细胞平均体积及其分布宽度值鉴别贫血的初步研究

目的　研究用红细胞平均体积 (MCV)及红细胞体积分布宽度 (RDW )鉴别各型贫血 ,以期改进传统的贫血形态学分类方法。方法　选取患者组 2 32例及对照组 12 0例行MCV及RDW测定 ,统计出各病例组及对照组的MCV、RDW值 ,结合临床进行分析。结果　不同贫血时 ,其外周血红细胞的MCV及RDW的改变各具特征。结论　MCV、RDW诊断各类型贫血的敏感性及特异性较高 ,对贫血的鉴别诊断有较为广泛的临床应用价值。     

Simultaneous Construct Surface Microstructural and Internal Network-Like Conductive Pathways of Poly(l-lactic acid)/Carbon Nanomaterials Composite Foams

The poly(l -lactic acid) (PLLA)/carbon nanomaterials composite foams with hierarchical surface microstructural and internal conductive pathways are successfully prepared by a simple crystallization-assisted rapid phase separation (CARPS). The dimension and morphology of carbon nanomaterials can induce different crystallization forms to construct the hierarchical surface microstructure, and they are distributed on the phase interface of solvent and non-solvent to form conductive pathways. It is found that the heterogeneous nucleation of nanomaterials promotes a significant increase in crystallinity, and a stacked granular structure formed on the surface promotes the increase of the water contact angle to 148.7°. Foams with interconnecting pore structures contribute to the formation of 85.3% porosity and 12.33 g g⁻¹ oil absorption. Carbon nanomaterials are distributed on the pore walls of the porous foam, which converts the foam from an insulating material to a conducting polymer. Furthermore, the uniform distribution of nanomaterials significantly affects the thermal stability of the PLLA. In belief, the multifunctional biodegradable foam, prepared by a CARPS method, makes it promising for industrial production and has potential applications in electrical conductivity, oil-water separation, and many other fields.     

Comparative behavioral characterization of the neuroactive steroids 3α-OH,5α-pregnan-20-one and 3α-OH,5β-pregnan-20-one in rodents

Pregnan steroids have been shown to possess anesthetic, hypnotic, anticonvulsant and anxiolytic properties. In this study, two endogenous neuroactive steroid isomers, 3-hydroxy-5-pregnan-20-one (3,5-P) and 3-hydroxy-5-pregnan-20-one 3,5-P), were studied for differences in their pharmacological properties using behavioral assays. 3,5-P and 3,5-P were similar in their potencies and efficacies in blocking pentylenetetrazol-induced seizures in mice (ED₅₀: 3,5-P=2.8 mg/kg and 3,5-P=3.0 mg/kg). Similarly, both neuroactive steroids produced roto-rod deficits within the same range of potency (TD₅₀:3,5-P=18.8 mg/kg and 3,5-P=21.2 mg/kg). However, in animal models of anxiety, subtle differences were observed between the two isomers. In both the light/dark transition test and elevated plus-maze, 3,5-P was more efficacious than 3,5-P, though both compounds had similar potencies. In the Geller-Seifter test, 3,5-P was more potent and efficacious than 3,5-P. Neither compound had significant effects on unpunished responding within the dose range tested. Both compounds produced similar biphasic curves in the locomotor test. All together, the data indicate that 3,5-P and 3,5-P have similar anticonvulsant activity, but the 5-isomer possesses more potent and efficacious anxiolytic properties than the 5-isomer.