蛇伤一号合剂治疗五步蛇咬伤临床观察

目的观察中药制剂蛇伤一号合剂对五步蛇咬伤的临床疗效.方法将66例病人分为两组,均给予常规治疗,治疗组加服蛇伤一号合剂,观察两组痊愈情况及病人肿胀开始消退时间、肿胀完全消退时间、疼痛缓解时间、局部坏死和功能受限发生率、住院时间等指标.结果两组病人临床疗效、肿胀开始消退时间、肿胀完全消退时间、疼痛缓解时间、局部坏死和功能受限发生率、住院时间均有显著性差异(P＜0.05).结论蛇伤一号合剂对五步蛇咬伤有显著疗效.     

鼻咽癌组织的显微切割及其 RNA 线性扩增

从微小体积鼻咽癌活检标本中获取纯净癌细胞一直是鼻咽癌分子生物学研究中的难题 . 为了寻找一种能从鼻咽癌活检组织中获得高纯度、高质量 RNA 来完成 cDNA 微阵列 (cDNA Microarray) 实验的简便实用方法,采用 RNAlater 技术保存鼻咽癌活检组织,显微切割技术来获得高纯度鼻咽癌细胞,利用 RNA 线性扩增技术得到 cDNA 微阵列实验所需 RNA. 结果表明：利用 RNAlater 技术可以很好地保持组织 RNA 的稳定,通过优化显微切割和 RNA 线性扩增的条件获得了 cDNA 微阵列实验所需的高纯度、高质量 RNA.     

青海湖岸带土壤与沉积物的地化特征与细菌群落对水位上升的响应

【目的】探究青海湖岸带土壤与沉积物的地化特征与细菌群落对水位扩张的响应。【方法】从岸上至岸下沿垂直青海湖岸带方向,采集距离湖面不同高度土壤(土壤：S1、S2)、岸边不同水深表层沉积物(过渡区：E0、E6、E17)及湖心表层沉积物(沉积物：D1、D2)样品,土壤与沉积物水深(土壤水深表示为负数)从小到大的变化表征岸边土壤被淹水转变为沉积物的过程。采用地球化学分析和16SrRNA基因高通量测序技术,探究岸带土壤与沉积物样品中的地化特征与微生物群落构成。【结果】青海湖水位上升导致的生境转变对岸带土壤与沉积物的理化性质、营养水平、有机碳类型等地化特征产生显著影响。具体表现为,随着水位升高,岸带土壤与沉积物的pH、矿物结合态有机碳含量显著升高,而碳氮比值、可溶性有机碳(dissolved organic carbon,DOC)、颗粒态有机碳含量显著下降。随着水位上升,青海湖岸带被淹没土壤的细菌群落多样性下降,且群落结构发生明显变化。这种变化与环境因子变化密切相关,具体表现为,细菌群落物种丰富度指数和香农多样性指数随着水位上升呈下降趋势;活性金属结合态有机碳含量与细菌群落多样性的变化密切相关;理化...     

一株耐碳青霉烯类鲍曼不动杆菌噬菌体的分离鉴定和临床应用

【背景】耐药菌感染是人类生命健康的重要威胁,寻找抗生素替代或辅助疗法迫在眉睫,噬菌体是细菌的天敌,有很大的开发潜力。【目的】分离针对耐碳青霉烯类鲍曼不动杆菌(carbapenem-resistant Acinetobacter baumannii, CRAB)的烈性噬菌体,治疗患者CRAB肺部感染,为噬菌体疗法的推广积累经验。【方法】用CRAB临床菌株NAB11B做宿主菌,从医院污水中分离新噬菌体,进行生物学特征和基因组特点的表征、分析后制备成高纯度的噬菌体制剂,通过雾化吸入的方式治疗肺部CRAB感染,评估噬菌体疗法的有效性和安全性。【结果】分离到一株新噬菌体,命名为AB＿SZL4,其潜伏期短、增殖速度快、抑菌能力强、生物学稳定性高且不携带有害基因。在临床应用中,噬菌体鸡尾酒联合抗生素疗法能快速清除肺部病原菌,且未见明显噬菌体相关不良反应。【结论】AB＿SZL4是一株有极大临床应用潜力的烈性噬菌体。     

16细胞期爪蟾胚胎背方与腹方裂球的发育能力

在两栖类爪蟾胚胎发育中,由受精引起的皮层转动造成了受精卵的背腹极性。为了研究受精卵细胞质的不均一分布对胚胎体轴形成的影响,我们进行了16细胞期动物极背、腹方裂球的外植和异位移植实验。16细胞期的动物极背方裂球在外植和移植到腹方位置后都表现出背方特征,如外植块培养到原肠中期时伸长,背方裂球在移植到腹方后引发第二体轴等;而16细胞期动物极腹方裂球移植到背方后其发育命运则遵循背方裂球的命运,参与背方结构的形成。我们认为在16细胞期,动物极背、腹方的裂球由于包含着不同的卵质,因而在发育能力上已经具有背、腹的差异。     

真蝽属一新种记述(半翅目:蝽科)

体黑褐色,触角淡褐(新鲜标本带绿色泽),端节端半部褐色,最末端稍淡。触角各节长度:Ⅰ∶Ⅱ∶Ⅲ∶Ⅳ∶Ⅴ=0.9∶1.4∶1.6∶1.9∶1.97毫米。头部侧叶稍长于中叶,使头顶端呈一缺刻,侧叶具黑色细边缘;头背面刻点粗、黑,在复眼内侧有一无刻点斑,该斑约与眼大小相当。复眼暗红,单眼玉红色。前胸背板侧角伸出甚长,平截(图2),其后缘远长于前翅革片基部;前侧缘略具细锯齿,有黄绿色或白色边缘;侧角前缘区、端区及后缘呈半黑色;角体向上翘起,背面拱起,腹面内凹;侧角端缘中央内凹呈弧形,前角     

Effect of springtime solar ultraviolet-B radiation on growth of Colobanthus quitensis at Palmer Station, Antarctica

We examined the influence of solar ultraviolet‐B radiation (UV‐B; 280–315 nm) on the growth of Colobanthus quitensis plants by placing them under contrasting UV‐B filters at Palmer Station, along the Antarctic Peninsula. The filters reduced diurnal biologically effective UV‐B (UV‐B_BE) either by 83% (‘reduced UV‐B’) or by 12% (‘near‐ambient UV‐B’) over the 63 day experiment (7 November 1998–8 January 1999). Ozone column depletion averaged 17% during the experiment. Relative growth and net assimilation rates of plants exposed to near‐ambient UV‐B were 30 and 20% lower, respectively, than those of plants exposed to reduced UV‐B. The former plants produced 29% less total biomass, as a result of containing 54% less aboveground biomass. These reductions in aboveground biomass were mainly the result of a 45% reduction in shoot biomass, and a 31% reduction in reproductive biomass. Reductions in shoot biomass were owing to an 18% reduction in branch production by main shoots, while reductions in reproductive biomass were the result of a 19% reduction in individual capsule mass. Total plant leaf area was reduced by 19% under near‐ambient UV‐B, although total leaf biomass was unaffected because leaves had a greater specific leaf mass. The reduction in plant leaf area under near‐ambient UV‐B was attributable to: (1) production of 11% fewer leaves per main shoot system and plant, which resulted from an 18% reduction in branch production by main shoots. Leaf production per individual main shoot or branch was not affected; (2) shorter leaf longevity—main shoots contained 14% fewer green leaves at a given time; and (3) smaller individual leaves—leaf elongation rates were 14% slower and mature leaves were 13% shorter.     

中国胭脂鱼同工酶的研究

本文利用同工酶电泳方法,研究了中国胭脂鱼的种群关系。分析的五种酶均为单态,故中国胭脂鱼应为一个种。并根据重复基因表达(祖征)情况,认为它应属于较原始的种类。少数重复基因不表达,形成功能二倍体为离征。其酶谱表现了组织的异质性,伹无性别、年龄的差异。