Growth,Nitrogen Uptake and Flow in Maize Plants Affected by Root Growth Restriction

The objective of the present study was to investigate the influence of a reduced maize root-system size on root growth and nitrogen （N） uptake and flow within plants. Restriction of shoot-borne root growth caused a strong decrease in the absorption of root ： shoot dry weight ratio and a reduction in shoot growth. On the other hand, compensatory growth and an increased N uptake rate in the remaining roots were observed. Despite the limited long-distance transport pathway in the mesocotyl with restriction of shoot-borne root growth, N cycling within these plants was higher than those in control plants, implying that xylem and phloem flow velocities via the mesocotyl were considerably higher than in plants with an intact root system. The removal of the seminal roots in addition to restricting shoot-borne root development did not affect whole plant growth and N uptake, except for the stronger compensatory growth of the primary roots. Our results suggest that an adequate N supply to maize plant is maintained by compensatory growth of the remaining roots, increased N uptake rate and flow velocities within the xylem and phloem via the mesocotyl, and reduction in the shoot growth rate.     

Growth and Contaminant Removal Effect of Several Plants in Constructed Wetlands

The aim of the present study is to probe the relation between plant growth and its decontamination effect in constructed wetlands. Four species were studied in the small-scale mono-cultured constructed wetlands, which were fed with domestic wastewater. Plant growth indexes were correlated with contaminant removal performance of the constructed wetlands. Wetlands planted with Cyperus flabelliformis Rottb. showed the highest growth indexes such as shoot growth, biomass, root activity, root biomass increment, and the highest contaminant removal rates, whereas wetlands planted with Vetiveria zizanioides L. Nash had the lowest growth indexes and the lowest removal rates. Above-ground biomass and total biomass were significantly correlated with ammonia nitrogen removal, and below-ground biomass with soluble reactive phosphorus removal. Photosynthetic rate had higher correlation with nitrogen removal in these species. Root activity and root biomass increment was more correlated with 5 d biochemical oxygen demand removal. Chemical oxygen demand removal had lower correlations with plant growth indexes. All four species had higher removal rates in summer and autumn. The results suggest that the effect of plant growth on contaminant removal in constructed wetlands were different specifically in plants and contaminants.     

小儿左肾巨大肾盂积水1例报道

1临床资料患儿,男,6岁。因左侧腰部胀痛及腹部日渐增大15天而来院诊治。患儿体质较差,极易感冒,无其它疾病史,半月前突感左侧腰部胀痛,日趋加剧,腹部逐日增大、纳差、呼吸困难加重,尿液逐渐减少。查体:左上腹部可触及大于成人拳头大小包块。拟诊为左肾积水,左肾肿瘤。行B超检查,静脉肾盂造影及CT平扫检查。B超示左中上腹部可见一囊性肿块,大小约12·4 cm×6·6 cm×6 cm,边缘似见肾实质结构回声,下腹探查膀胱上方稍偏左见一较小囊性肿块,排尿后有缩小趋向,左肾肾门结构及输尿管显示不清,考虑为左肾积水,左肾先天性异常。静脉肾盂造影前摄…     

《本草图经》菜部品种特色及其临床中药学意义

以《本草图经》(辑校本)菜部收录的品种为研究对象，运用文献研究方法和数据统计分析工具，对该卷内容进行整理归纳。结果表明，《本草图经》菜部收载的品种多为既可以食用，又有医疗作用的中药，苏颂在记载该类药材品种时，特别注重记录其服食禁忌、用法和制法、医方出处，从而保障临床用药的正确、安全、合理。由此可见，苏颂的学术思想对现代临床中药学有着很好的启示与指导作用。     

植物DNA双链断裂修复的保守性和特异性

文章概述了植物DNA双链断裂（double-strand break，DSB）修复的研究进展。从酵母、脊椎动物、植物在此领域已取得的成果来看，真核生物DSB修复在过程和参与蛋白方面均有一定的进化保守性；另一方面，植物的DSB修复有其特异之处。     

康宁宣布生命科学部中国新厂地址

2010年10月12日，康宁公司在吴江举行的签约仪式上宣布，吴江经济开发区（WEDZ）将成为生命科学部在中国的新厂所在地。吴江市领导与康宁公司领导参加了签约仪式。该工厂将面向处于萌芽阶段的中国生命科学市场，并使康宁成为首家在本地进行实验室器材生产的美国制造商。     

经尿道输尿管镜气压弹道碎石术后并发症的观察及护理

对136例输尿管镜下气压弹道碎石术后患者进行回顾性分析。18例患者出现术后并发症,术后护理中应严密关注尿液颜色、腰酸腰痛、体温变化及腹部体征情况,及时发现并发症,妥善处理,可以减少患者痛苦。     

1999～2007年皮肤科门诊浅部真菌发病及镜检情况分析

目的了解广州地区1999～2007年间皮肤科门诊浅部真菌病发病的种类和构成比及流行病学特点。方法对临床拟诊为浅部真菌病者,取皮屑行10%KOH涂片进行真菌直接镜检。结果2002年后就诊人数及构成明显增加,近9a发病种类和构成没有明显变化。各种浅部真菌病中发病检出率占前3位的依次为体癣（34.3%）、手足癣（32.6%）、股癣（12.4%）。镜检阳性率排前3位的为马拉色菌毛囊炎74.9%、花斑糠疹55.5%、甲癣45.5%,总阳性率为34.3%。镜检阳性率受病种、性别、年龄、取材部位、疑似鉴别病例数量等因素影响。结论就诊人数与检出率呈逐年增加的趋势,1999～2007年间广州地区浅部真菌发病的种类和构成比无明显变化,目前直接镜检法在临床上仍不失为经济、简便易行的真菌学检查方法。     

盐酸布替萘芬乳膏治疗浅部真菌120例

2004年6月～2005年7月，我科用盐酸布替萘芬乳膏治疗浅部真菌病患者120例，疗效良好。