Mycosynthesized Silver Nanoparticles as Potent Growth Inhibitory Agents Against Selected Waterborne Human Pathogens     

《洁净——土壤、空气、水》2017,45(4)

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Growth structures and growth strata of the Qianjiadian Basin in the western Yanshan fold and thrust belt,North China     

Xiaofei SHI  Shaofeng LIU  Chengfa LIN 《中国科学:地球科学(英文版)》2019,(7):1092-1109

The northwestward subduction of the Izanagi Plate beneath the eastern Eurasian Plate during the Late Mesozoic caused a series of compressional deformation events in the Yanshan fold and thrust belt(YFTB), but the tectonic deformation timing, tectonic properties and relationship between tectonic uplift and sediment accumulation in the intermontane basins continue to be debated. For this reason, the sedimentology, sediment provenance, and basin structure of the Qianjiadian Basin(QJB) in the northern Beijing region during the Late Jurassic and Early Cretaceous were studied in detail. The results suggest that a fault-propagation fold-type(FPFT) growth structure and growth strata developed on the western edge of the QJB and that the top part of Member 2 and Member 3 of the Tuchengzi Formation are growth strata controlled by the limb rotation mechanism. In two small thrust faults in the QJB, the Mesoproterozoic Xiamaling Formation is thrust over the Tuchengzi Formation, and these faults may have controlled the development of the fault-bend fold-type growth strata. An analysis of the "source-to-sink" process suggests that the hanging wall succession of the Shangyi-Pingquan fault(SPF) was the main source area of the Late Jurassic to early Early Cretaceous strata in the QJB. A zircon206 Pb/238 U age of 140.8±2.4 Ma for the volcanic rocks at the bottom of the FPFT growth strata represents the timing of the initiation of FPFT growth structure development. The discovery of the FPFT growth structure and growth strata in the QJB indicate that the QJB was an intermontane flexural basin controlled by fold and thrust structures during the early Early Cretaceous. Near the E-W-trending SPF, the NE-SW-trending Qianjiadian thrust fault(QJTF) and two small intrabasinal thrust faults may constitute a unified right-lateral strike-slip system that formed in response to the northwestward flat subduction of the Izanagi Plate beneath the East Asian continent during the Jurassic-Early Cretaceous.  相似文献   

里下河古潟湖相软土基本工程特性与形成机理的关系     

姜鹏  贺富强  方磊  张德军 《工程地质学报》2006,14(6):769-775

淮盐高速公路穿越的里下河地区,广泛分布有高含水量、高压缩性古潟湖相软土,工程性质很差,该层软土的工程性质与里下河古潟湖的形成机理密切相关。本文在对潟湖形成一般模式总结的基础上,结合苏北地区第四纪以来沉积环境及区域地质地貌变化情况,得出里下河古潟湖相软土的形成机理,并对淮沿高速公路盐线典型地段土样工程性质进行分析,根据土的工程性质的垂直变化,判断古潟湖相软土的分布情况,进而寻找古潟湖相软土工程性质与其形成机理之间的关系。  相似文献   

疣荔枝螺形态性状对质量性状的影响     

田传远  夏珮伦  张嘉荣  于瑞海  郑小东  顾忠旗 《中国海洋大学学报(自然科学版)》2020,(2):37-44

随机抽取100只同龄疣荔枝螺(Thais clavigera Kuster),开展其形态性状与体质量和软体部质量的相关与通径分析。实验选取并测量了壳长(X1)、壳宽(X2)、壳厚(X3)、壳口长(X4)和壳口宽(X5)等5项形态性状以及体质量(Y)和软体部质量(Z)等2项质量性状,运用相关分析、通径分析和多元回归分析等方法分析了各形态性状对体质量和软体部质量的影响。相关分析表明,疣荔枝螺各项性状间的相关均呈极显著(P<0.01)。通径分析表明,形态性状对体质量直接影响大小的顺序为壳长(0.459)>壳宽(0.277)>壳厚(0.209)>壳口宽(0.140);壳长对体质量的直接决定系数最大(0.220),是影响体质量的主要因素。通过多元回归分析,建立了形态性状对体质量的回归方程:Y=-9.714+0.220X1+0.204X2+0.195X3+0.151X5。  相似文献   

不同饵料对斑节对虾(Penaeus monodon)幼虾的生长及对WSSV 敏感性的影响     

胡贤德  孙成波  丁树军  王平  李义军  许政生  李婷  徐安敏 《海洋与湖沼》2009,40(3):296-301

采用5种不同饵料投喂斑节对虾幼虾,研究各饵料对幼虾的体长、体重及成活率的影响,实验周期为20天;然后用投喂攻毒的方法分别感染WSSV,观察不同饵料对幼虾WSSV敏感性的影响。实验周期为12天。结果表明,投喂卤虫无节幼体组的幼虾,其体长、体重增长明显优于其它各组（P〈0．01）,随后依次为贝肉组、鱼肉组、人工配合饲料组、虾片组。不同饵料对幼虾WSSV敏感性的影响也有差异：投喂感染WSSV后,卤虫组和鱼肉组成活率最高,明显高于贝肉组、人工配合饲料组和虾片组（P〈0．01）。PCR检测表明,感染后全部幼虾个体为病毒阳性。  相似文献   

Abundance and growth of larval and early juvenile cod (Gadus morhua) in relation to variable environmental conditions west of Iceland     

Jonas P. Jonasson  Bjrn Gunnarsson  Gudrun Marteinsdottir 《Deep Sea Research Part II: Topical Studies in Oceanography》2009,56(21-22):1992

Around Iceland, the west- and north-flowing coastal current, induced by freshwater runoff, provides a transport mechanism for pelagic eggs and larvae derived from the main spawning grounds off the southwest coast to the main nursery grounds off the north coast. In the present study, abundance and growth of larval and juvenile cod were recorded during a series of cruises conducted in June/July of 1998–2001 along the drift route southwest and west of Iceland. The cruises provided information on approximately 2–8-week-old individuals. Hatch dates and abundance varied greatly between years. Hatch dates ranged from Julian Day 92 to 167. Growth rate differed also between the years studied. Relative abundance was generally greatest in temperatures above 7.5 °C and in low-salinity waters, characteristic for the coastal current. The study demonstrates the link between the coastal current and larval/juvenile distribution, thus providing evidence for its importance in promoting successful recruitment of the Icelandic cod stock.  相似文献   

春季生殖真鲷仔、稚、幼鱼的摄食与生长   总被引：7，自引：0，他引：7  

张雅芝  陈而兴 《海洋科学》1998,22(3):57-62

１９９６年５￣６月份在本院海水育苗试验场对人工培养的春季生殖真鲷仔、稚、幼鱼的摄食和生长特性进行分析,旨在为该种群早期发育阶段的生物学积累资料,并为开展大批量苗种生产提供依据。结果表明,在水温在２３℃时,仔鱼约经５５￣６０ｈ左右开口摄食,开口饵料为小型臂尾轮虫。以后随着鱼体的生长（〉１０ｍｍ）,摄食桡足类的比例迅速增加。对２８５尾仔、稚、幼鱼观察,在实验条件下,其摄食率达１００％。摄食量约占体重的  相似文献   

Modeling the Sudden Decrease in CH_4 Growth Rate in 1992     

张仁健  王明星 《大气科学进展》1999,(2)

1.IntroductionMethane(CH#)isanimportantgreenhousegasinatmosphere.ThemainremovalprocessofCH4inatmosphereisreactedwithOHwhichisdeterminedbytheabundanceofmethane,carbonmonoxide(CO)andnitrousoxides(NO.)whoseemissionshaveincreasedgreatlybecauseofhumanacti...  相似文献   

不同抗流能力大黄鱼(Larimichthys crocea)肌肉转录组学差异分析     

张静静  王亚冰  王倩  韩多彩  彭士明 《海洋与湖沼》2023,54(5):1507-1516

为揭示不同抗流能力的大黄鱼(Larimichthyscrocea)肌肉基因表达水平的变化,筛选抗流相关基因,解析大黄鱼抗流性状形成的分子基础,收集福建福鼎沙埕湾主养区1 000尾大黄鱼,在设计制作的抗流实验水槽中,以流速1.0m/s为筛选条件,将抗流时间>30 min的大黄鱼归为抗流组(HM组),抗流时间<5 min的大黄鱼归为非抗流组(SM组),对其肌肉进行转录组分析,并统计抗流分组后48 h内大黄鱼的累计死亡率。转录组结果显示, HM组与SM组文库共富集到1806个差异表达基因(DEGs),其中1090个上调,716个下调。GO功能注释发现显著富集的条目主要集中在肌肉收缩相关功能, KEGG富集分析发现上调的DEGs主要富集在心肌收缩、氧化磷酸化、黏着斑、ECM-受体相互作用、AGE-RAGE、MAPK、心肌细胞中的肾上腺素能等相关通路;下调的DEGs主要富集在真核生物核糖体的发生、蛋白酶体、内质网中的蛋白加工、RNA转运、泛素介导的蛋白水解信号通路等。此外,RT-qPCR结果表明,随机选取的DEGs与RNA-seq结果的表达趋势一致。48h的累计死亡率结果显示,SM组...  相似文献   

泥蚶(Tegillarca granosa)主要经济性状遗传参数的估算   总被引：4，自引：4，他引：0  

孙长森  林志华  董迎辉  肖国强  柴雪良 《海洋与湖沼》2010,41(6):907-913

采用巢式设计和人工控制授精方法构建了19个半同胞和41个全同胞泥蚶家系,研究了泥蚶各发育阶段生长性状遗传力及性状间遗传相关和表型相关。结果表明,泥蚶家系间各个阶段生长性状均存在一定变异,总体表现生长早期家系间变异较大,发育至后期家系间变异明显降低。在遗传力参数上,表现为体尺性状遗传力大于体重性状,如11月龄壳长、壳高、壳宽遗传力分别为0.298、0.313和0.257,而湿重遗传力仅为0.138;在体尺性状中,则表现为壳长、壳高的遗传力高于壳宽,如4月龄壳长、壳高遗传力分别达到0.378和0.357,而壳宽为0.312。各性状之间表型相关和遗传相关分析表明,不同发育阶段各性状表型相关系数都达到了极显著水平,而在遗传相关上,早期稚贝遗传相关系数均达极显著水平,发育至后期遗传相关系数变小。  相似文献