The response of benthic macrofauna to anthropogenic stress in Narragansett Bay, Rhode Island: a review of human stressors and assessment of community conditions

The present state of knowledge regarding the input of anthropogenic pollutants into Narragansett Bay, Rhode Island was reviewed and benthic infaunal communities present at four depositional environments within the upper Bay were characterized. Inter-station differences in species composition and abundance of these assemblages were examined in relation to established pollution gradients.Using diversity curves and multivariate statistics, evidence of significant anthropogenic impact on the structure of benthic macrofaunal communities in Narragansett Bay was identified. The magnitude of this impact was greatest at stations closest to the Bay’s urban centers, where exposure to multiple stressors had resulted in communities of opportunistic taxa which persisted in a state of low faunal diversity characteristic of early stages of species succession. As was expected based on historic models of faunal succession; the apparent maturity of benthic assemblages in Narragansett Bay increased along the north-south gradient of decreasing anthropogenic stress.     

Screening of one-well hydraulic barrier design alternatives

This study develops a robust method for screening one-well hydraulic barrier design alternatives that can be easily computed without a numerical simulation model. The paper outlines the general method and shows its implementation with hydraulic barriers using a single pumping well. For such barriers, the method is easily computable with spreadsheets and/or charts depicted within the paper and posted online. The method applies the potential flow theory, which leads to using a curvilinear coordinate system for all types of calculations. For contaminant transport calculations, the method applies the boundary layer theory. For calculations of aquifer remediation, the method refers to bulk characteristics of the domain. As an example, the method has been applied to calculate the possible containment of a wide part of the coastal plain aquifer in Israel, which is contaminated by entrapped kerosene (a light nonaqueous phase liquid).     

胶州湾北部水域浮游植物研究Ⅰ——种类组成和数量变化

根据 1995年 3月至 1996年 1月胶州湾北部水域调查资料 ,对调查区浮游植物种类组成、细胞数量、优势种组成和季节变化进行了分析研究 ,并与历史资料进行了比较。结果表明 ,浮游植物主要由硅、甲藻组成 ,其中硅藻在细胞数量和种类上都占优势 ;浮游植物细胞数量平面分布的总趋势依月份而异 ;季节变化属双周期类型 :高峰期出现在 1月和 9月 ,低谷期出现于 5月和 11月 ;与历史资料不同的是 ,网采浮游植物的种类和细胞数量都呈现出不同程度的下降趋势。     

心康操结合健脾养心汤治疗慢性心力衰竭30例临床观察

目标：观察健脾养心汤结合心脏康复操治疗慢性心力衰竭（CHF）的临床疗效。方式：将60例CHF患者随机分为2组,对照组30例选用西医常规治疗,治疗组30例在对照组治疗基础上给予健脾养心汤结合心脏康复操治疗。观察2组治疗前后症状、体征改善情况及左室射血分数（LVEF）的变化。结果：治疗组和对照组的治愈率分别为86.7%、46.7%,组间比较,差异有统计学意义（P<0.01）。2组LVEF治疗前后组内比较及治疗后组间比较,差异均有统计学意义（P<0.01）。结论：健脾养心汤结合心脏康复操治疗CHF具有较好疗效。     

基于网络药理学及分子对接探讨人参治疗胃癌的作用机制

目的：基于网络药理学及分子对接技术探讨人参治疗胃癌的作用机制。方法：利用网络公开数据库筛选人参有效成分、分子靶点及胃癌疾病靶点。采用Perl工具获取药物-疾病交集靶点基因,生物信息学方法构建活性成分-疾病靶点网络,筛选核心靶点,并进行生物学功能富集分析。应用AutoDock Vina软件和Pymol对核心成分及蛋白靶点进行分子对接和结合能力预测。结果：获得人参22种有效成分及98个对应靶点,筛选出人参治疗胃癌的核心靶点3个,包括转录因子p65（RELA）、转录因子AP-1（JUN）、丝裂原活化蛋白激酶8（MAPK8）。基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析结果显示,人参主要通过参与抗炎、细胞凋亡、免疫调节等生物学过程治疗胃癌。分子对接结果显示,山柰酚与关键靶点JUN、MAPK8有强烈的结合能力。结论：人参通过抗炎、细胞凋亡、免疫调节等过程发挥多组分、多靶点、多通路的协同抗胃癌作用。     

基于A星算法的无人机路径规划优化模型研究

在分析传统无人机路径规划方法应用局限的基础上,针对传统A星算法启发函数单一、拐点冗余,以及效率不够高等系列问题,以虚拟城市地理环境为研究背景,通过提出面向起讫节点方位角的A星算法加速优化、启发式搜索中动态加权重构评价函数的A星算法加速优化和顾及Floyd算法插点策略的A星算法路径优化等层次递进的算法优化策略,解决了对A星算法搜索方向的量化约束、搜索权重数值的优化重构及冗余拐点的插点删除等技术问题,实现了改进后的A星算法运行效率的显著提高及最短路径判定准确性的明显提升。     

广西泗顶:隐匿在山水之间的矿山古镇

广西北部的融安县泗顶镇是群山中的一个乡间小镇,位于马鞍山、白面山、腊烛山和元宝山之间,三条溪水汇合处,故取名泗顶,意为三条溪水四座山之顶。泗顶属石灰岩山区,得天独厚的喀斯特地貌造就了多姿多彩的自然风景,山岗层叠、峰丛林立、瀑布成群,2016年入选柳州旅游协会评出的"十大旅游新秘境"。因矿成镇融安县隶属于广西柳州市,与柳州、桂林分别相距110公里和140公里,聚居着汉、壮、苗、瑶、侗等19个民族。东面与临桂等县接壤,南面与柳城、鹿寨等县毗邻,西面与融水县相邻.     

【已撤稿】淡水磷监测中钼酸铵分光光度法的改进

我国现行淡水水体中磷测定方法为钼酸铵分光光度法（GB 118931989）,该方法检测下限为0.01 mg/L,但我国南亚热带地区部分水体的总磷以及多数水体的溶解态磷浓度均低于0.01 mg/L,通过对标准试样和野外水样的测定,分析该方法在监测低磷浓度水体中可能出现的问题并提出改进方法.结果表明：对于磷浓度低于0.01 mg/L的水体,国标法灵敏度低,准确性差.通过3个方面的改进可提高该方法测定的灵敏度和准确性：1）将消解水样体积由25 ml增加到50 ml,消解后不再进行二次稀释定容;2）改变显色剂的配制,显色剂由14%硫酸溶液50 ml、酒石酸锑钾溶液5 ml、4%钼酸铵溶液15 ml和0.1 mol/L的抗坏血酸溶液30 ml混合而成,现配现用;3）将测定波长设置为880 nm.改进后方法的灵敏度有较大提高,能准确、有效地检测磷浓度在0.003~0.01 mg/L的水样.