溢油指示物(指标)HPLC-UVD研究

建立了溢油指示物（ 指标）ＨＰＬＣ—ＵＶＤ 相似性模式，给出了溢油指示物（ 指标）ＨＰＬＣ—ＵＶＤ 相似性的择近原则，指出溢油指示物（ 指标）ＨＰＬＣ—ＵＶＤ相似性主要受控于油种、风化和实验误差等因素的影响。结果表明，ＨＰＬＣ—ＵＶＤ 相似性模式可作为溢油指示物（ 指标） 。     

Initial Homotypic Cell Pair Adhesion in Regenerating Hydra Facilitates Subsequent Adhesion of Homotypic Cells

 In Hydra vulgaris at the level of dissociated single cells endodermal cells adhere to each other more readily than to ectodermal cells at the initial adhesion. The time required for adhesion to occur between two adjacent cells is shorter for both endodermal and ectodermal homotypic cell adhesions once the initial adhesion of the first pair of cells has been established. It is confirmed that contact of an aggregated pair with additional homotypic cells facilitates the occurrence of homotypic adhesions; heterotypic adhesions are discouraged. This suggests that adhesion of homotypic cells contributes to an increased readiness for subsequent homotypic cells to adhere. Received: 25 August 1999 / Accepted in revised form: 11 January 2000     

2000年以来黄河流域土地市场化时空格局演变及驱动因素

基于土地市场交易结构的视角,测算2000-2016年黄河流域104个地级以上城市一级土地市场化程度,综合利用Global Moran's I、G^*_i指数空间统计模型对其时空格局演变特征进行分析,运用灰色关联度分析模型探究土地市场化时空格局演变的主要驱动因素。研究发现：2000-2016年,黄河流域土地市场化水平表现出先持续上升后不断下降的阶段性变化特征,呈现了“东高西低”的空间分异格局。黄河流域土地市场化水平整体具有显著的空间自相关性,土地市场化热点区域以下游主要城市为核心,经历了先加速蔓延、后缓步收缩的时空演进历程。黄河流域土地市场化水平的时空格局演变主要由经济发展水平、产业结构升级、固定资产投资、政府财政收支比、外商直接投资以及区位条件等因素共同驱动,但受我国社会经济发展的阶段性影响,各因素在不同年份的影响程度存在显著的差异性。     

不同声学元件在公路声屏障中的应用

通过对公路声屏障不同声学元件声学性能的比较研究，阐明了两种声学元件在治理交通噪声中的差别，指出吸声共振型声学元件将是未来公路声屏障的发展方向，该研究结论对于开展公路声障声学设计有较为重要的参考价值     

酸沉降破坏材料造成的经济损失的估算研究

酸沉降对材料的破坏和其经济损失估算是国际上酸沉降研究领域听一个重要课题，国内在经方面的研究较少，文章通过对“两广酸沉降破坏材料造成的经济损失的估算”研究，提出了了一套较实用的经济损失估算方法。     

珠江三角洲一些城市水体中微量有机氯化合物的初步分析

采用较快速、简便的方法，用ＧＣ／ＥＣＤ对珠江三角洲几个城市中的污水及深圳河，大沙河中的有机氯化合物进行了初步探查及半定量分析。结果表明，几种有机氯农药尽管已停止生产多年，但在污水及河水中仍有残留，其中ＤＤＴ及其衍生物ＤＤＥ含量在０．０２－０．５０μｇ／Ｌ范围内；ＢＨＣｓ在０．０４－０．７２μｇ／Ｌ范围内，氯苯类化合物及ＰＣＢｓ在污水及不中也被检出。     

Prenatal diagnosis in two cases of de novo complex balanced chromosomal rearrangements. Three-year follow-up in one case

We report two cases of apparently balanced complex de novo chromosomal rearrangements (BCCR) detected prenatally at 17 weeks and 10 weeks of gestation, respectively. Chromosomes were studied using GTG-banding and fluorescent in situ hybridization (FISH). In one case four chromosomes and in the other case three chromosomes were involved in the rearrangements. One of the pregnancies was terminated and no external or internal abnormalities were detected at autopsy. The other pregnancy continued to term. Level III ultrasound examination showed no abnormalities. The child is now 3 years old and has neither congenital anomalies nor evidence of delayed psychomotor development.