HCO-3碱度对铜绿微囊藻生长与光合活性的影响

研究了23 mM (ALK23)和124 mM (ALK124) HCO-3对铜绿微囊藻(〖WTBX〗Microcystis aeruginosa〖WTBZ〗 FACHB 927)生长与光合特性的影响。实验结果表明，ALK23显著抑制铜绿微囊藻的生长，至培养结束，与对照相比对生物量的抑制率为38%，ALK124条件下虽然至培养结束生物量没有显著变化，但碱度增加铜绿微囊藻生物量有一个快速的增殖期，之后其生长速率持续下降。碱度增加强烈抑制光合色素Chla的合成，ALK23和ALK124条件下对Chla含量抑制率分别为74％和56％。藻胆蛋白与叶绿素a的比值（PBP/Chla）在碱度增加的条件下有显著升高。HCO-3碱度增加，铜绿微囊藻的光合活性先降低之后逐渐恢复，至处理结束表现出低碱度（ALK23）促进光合活性，高碱度（ALK124）对光合活性影响不显著。说明HCO-3碱度增加对铜绿微囊藻有一定伤害作用，与高碱度（ALK124）相比，低碱度（ALK23）对细胞的伤害程度更大，随着细胞的增殖，碱度对细胞的伤害作用逐渐恢复，且低碱度下细胞恢复更快。暗示碱度可以作为水华控制的手段之一.     

淮北台DSQ型与SSQ-2I型倾斜仪观测资料的对比分析

对淮北台DSQ型水管和SSQ-2I型水平摆倾斜仪观测资料质量从一般指标和内精度指标进行定量判定,结果表明水管仪观测质量较高,稳定性不及水平摆倾斜仪,观测数据均受大风和降雨影响。因仪器工作原理、技术参数等因素不同,记录到同震形变波在响应延迟、最大振幅和形态特征等方面存在一定差异。     

上市公司会计报表的主要粉饰手法及其识别

近年来,上市公司通过粉饰会计报表来达到配股条件或防止摘牌的现象时有发生,本文揭示了上市公司常用的会计报表粉饰手法,如关联交易法、虚拟资产法、不当收入和费用确认法、溢列存货法等,并分别提出了相应的识别方法.     

Sonographic features of lethal multiple pterygium syndrome at 14 weeks

Lethal multiple pterygium syndrome is a rare inherited disorder. Previous reports suggest that the diagnosis may be based on prenatal sonographic demonstration of severe limb flexion, absence of fetal motion, and a large cystic hygroma in the second and third trimesters. We present the sonographic features and postmortem features of a fetus with lethal multiple pterygium syndrome at 13 weeks of gestation, which shows that the condition can possibly be diagnosed in the first trimester of pregnancy. Copyright © 2005 John Wiley & Sons, Ltd.     

Thermocoagulation of fetal sacrococcygeal teratoma

Fetal sacrococcygeal teratoma can lead to a high output cardiac failure resulting in hydrops fetalis. One of the prenatal therapeutic options is to occlude the feeding vessels by radiofrequency ablation. We present a case of fetal sacrococcygeal teratoma diagnosed at 13 weeks of gestation. The tumour increased in size more than 100-fold over 5 weeks causing polyhydramnios and cardiac and placental enlargement. Thermocoagulation was performed at 18 weeks' gestation by passing an insulated electric wire through an 18-gauge needle placed close to the feeding vessels of the tumour at its neck. Blood supply to the tumour was successfully reduced. However, fetal death was diagnosed 2 days after the procedure. We speculate that it may be safer to limit the extent of coagulation in one attempt but to repeat the procedure at a later stage when necessary. Copyright © 2002 John Wiley & Sons, Ltd.     

铁路环境噪声评价物理模拟方法研究

本文依据声学相似律理论，重点讨论了声学物理模拟实验的实现方法，并通过现场实验测量结果验证了模型实验测量结果。研究结果表明，采用物理模拟实验方法研究、评价铁路噪声，尤其是建筑群中的声场分布是可行和可靠的。     

The effect of fetal gender on nuchal translucency at 10–14 weeks of gestation

Recent data have suggested that fetal nuchal translucency (NT) is affected by fetal gender. We investigated the size of this effect in 12 189 unselected pregnancies with known normal outcomes that had undergone NT measurements between 10 and 14 weeks of gestation. NT increased with gestation and was converted to multiples of the median (MoM) for the gestational day. The median NT MoM (95% CI) for female fetuses was 0.98 (0.97–0.99). This was significantly lower than that of the male fetuses (1.03; range1.02–1.04) (p<0.0005; Wilcoxon rank-sum test). The gender difference was not observed at 10 weeks but was observed from 11 weeks onwards. There is no obvious explanation for the above findings. Copyright © 2001 John Wiley & Sons, Ltd.     

桃浦河底泥COD_(Cr)和NH_3-N的分布特征浅析

根据上海市桃浦河的河道形态和地貌特征,共设计和采集了15个柱样,在对其进行CODCr、NH3-N系统测定分析的基础上,得出以下结论:(1)桃浦河底泥已受到严重污染,CODCr、NH3-N的平均含量分别超过参照标准值(CODCr9699.6mg/kg,NH3-N78.79mg/kg)1.1～10倍和1～5_8倍,污染最严重的是真大路桥到沪嘉高速公路段;其次是环镇北路桥到陈太路存瑞桥段,云岭东路桥到中科化工厂桥段,杨柳青路桥到北石路桥段。(2)垂直分布呈现由下而上污染加重的趋势,表明现代污染日趋严重。(3)不同河段污染程度出现差异主要与其所处周围环境的排污有关。(4)基于桃浦河底泥污染程度的不同,在底泥疏浚时应予以区别对待。     

现代体育美学对体育教师的要求

全面推动素质教育,已成为我国21世纪体育教学改革的主要内容。体育美学作为体育教学的一个重要组成部分,在素质教育的改革大潮中应对体育教师提出什么样的要求呢?本文将从体育美学和中国传统哲学范畴——“形神论”的角度,对在体育教学中起主导作用的体育教师进行分析,进而阐明21世纪体育教师应具备什么样的素质。