检索结果-南通市图书馆

journal of Oceanology and Limnology 2018年第4期36卷 1112-1125页

作者： Robert Michael L.McKAY Taylor TUTTLE Laura A.REITZ george S.BULLERjAHN William R.CODY Adam j.McDOWELL Timothy W.DAVIS Department of Biological Sciences Bowling Green State University Bowling Green OH 43403 USA Aquatic Taxonomy Specialists Malinta OH 43535 USA City of Defiance Water Division Defiance OH 43512 USA NOAA great Lakes Environmental Research Laboratory Ann Arbor MI USA

In late May 2016, a cyanobacterial harmful algal bloom(cHAB) was detected in the Maumee River, the largest tributary to Lake Erie, the southernmost lake of the Laurentian great Lakes system. Testing on 31 May identified planktothrix agardhii as the dominant cyanobacterium with cell abundance exceeding 1.7×10~9 cells/L and total microcystins(MC) reaching 19 μg/L MC-LR equivalents, a level over 10-fold higher than the 2015 revised U.S. Environmental protection Agency(EpA) national health advisory levels for drinking water exposure to adults. Low river discharge coincident with negligible precipitation through the latter half of May coincided with an 80% decline in river turbidity that likely favored bloom formation by a low-light adapted p. agardhii population. Also contributing to the c HAB were high initial nutrient loads and an increase of the river temperature from 13℃ to 26℃ over this same period. The bloom persisted through 5 june with microcystins exceeding 22 μg/L MC-LR equivalents at the bloom peak. By 6 june, the river had returned to its muddy character following a rain event and sampling on 7 june detected only low levels of toxin(g/L) at public water systems located near the bloom origin. The elevated toxin production associated with this early onset bloom was without precedent for the Maumee River and an unique attribute of the c HAB was the high proportion of potentially-toxic genotypes. Whereas planktothrix spp. is common in lotic environments, and has been previously detected in the Maumee, blooms are not commonly reported. This early onset, microcystin-producing c HAB provided a rare opportunity to glean insights into environmental factors that promote bloom development and dominance by planktothrix in lotic environments.

关键词： cyanobacteria microcystin planktothrix qpCR river

维普期刊数据库

growth and Toxin production by Microcystis Aeruginosa pCC 7806 (Kutzing) Lemmerman at Elevated Salt Concentrations

在线全文

学校读者我要写书评

暂无评论

journal of Environmental protection 2011年第6期2卷 669-674页

作者： Ken Black Mete Yilmaz Edward j. phlips 不详

One of the most common and widespread bloom-forming cyanobacteria associated with toxin production is Microcystis aeruginosa (Kutzing) Lemmerman. While normally associated with fresh water environments, this toxigenic species has been observed at bloom concentrations in a number of major estuaries worldwide. This study examined the effect of salinity on growth and toxin production by M. aeruginosa strain pCC 7806 under controlled laboratory conditions. Salt concentrations above 12.6 ppt resulted in total cessation of growth. Toxin production was similarly affected, with cultures grown in salt concentrations of 4.6 ppt and above yielding less toxin than the control after 20 days of culture. Toxin concentrations after 20 days of culture were 40% of the control at 4.6 ppt. The relative proportion of extracellular to intracellular toxin increased over time in cultures with salt concentrations greater than 4.6 ppt. Extracellular toxins persisted in the media long after the cessation of growth. The results suggest that the influence of M. aeruginosa and/or its toxins can extend well out into estuarine environments under the influence of significant freshwater inputs.

关键词： Microcystin Cyanobacteria Estuaries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

叉唇虾脊兰

广西植物 1994年第2期 100-100页

作者： painting:X.g.Zou Cultivating and Writing:Y.g.Wei and X.j.Deng Colanthe hancockii Rolfe Kew Bull.

叉唇虾脊兰绘图：邹贤桂栽培及配文：韦毅刚邓兴杰叉唇虾脊兰（ＣａｌａｎｔｈｅｈａｎｃｏｃｋｉｉＲｏｌｆｅ）．由英国学者Ｒ．Ａ．Ｒｏｌｆｅ于１８９６年发表在ＫｅｗＢｕｌｌ．上，模式标本采自中国。现分布在广西、云南东部和西... 详细信息

叉唇虾脊兰绘图：邹贤桂栽培及配文：韦毅刚邓兴杰叉唇虾脊兰（ＣａｌａｎｔｈｅｈａｎｃｏｃｋｉｉＲｏｌｆｅ）．由英国学者Ｒ．Ａ．Ｒｏｌｆｅ于１８９６年发表在ＫｅｗＢｕｌｌ．上，模式标本采自中国。现分布在广西、云南东部和西北部、四川中部。陆生兰．常见于山地...

关键词：叉唇虾脊兰英国大不列颠及北爱尔兰联合王国中华人民共和国模式标本云南东部

Impacts of Aquaculture and Domestic Wastewater on the Water Quality of Santubong River, Malaysia

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

journal of Environmental Science and Engineering 2010年第4期4卷 11-16页

作者： T.Y. Ling C.M. Michelle L. Nyanti I. Norhadi j.j.E. justin Faculty of Resource Science and Technology University Malaysia Sarawak Kota Samarahan 93400 Malaysia Natural Resources and Environment Board Sarawak Kuching 93050 Malaysia

Developments along the Santubong River basin may have an impact on the aquatic ecosystem. To determine the impacts of activities on the water quality, ten stations were selected for water quality study over 9 months. Results show that salinity increases from 14.0 pSU upstream to 30.4 pSU downstream. Lowest DO range was 2.3-4.1 mg/L. TSS ranged was 20-135 mg/L and the highest was observed near construction and residential areas, the second and third highest near shrimp culture discharge areas. BOD5 was the highest near construction and residential areas. BOD5 of a station near shrimp culture was not significantly different from the residential areas. Two stations near shrimp culture site also recorded the highest Chl-a. The highest ammonia-nitrogen, nitrite-nitrogen and reactive phosphorus were observed at stations near shrimp farm sites whereas nitrate-nitrogen was the highest near construction and residential areas. Cage culture site showed the highest phosphorus and second highest nitrite-nitrogen and ammonia-nitrogen. This study showed that TSS and BOD5 were elevated near residential and construction areas and nutrients were elevated near shrimp farm sites resulting in algal bloom. Therefore, it is recommended that residential and shrimp farm discharge be treated to acceptable quality before discharge to protect the aquatic resources.

关键词： Shrimp aquaculture household wastewater water quality Santubong River.

Fasciculation and elongation zeta proteins 1 and 2: From structural flexibility to functional diversity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World journal of Biological Chemistry 2019年第2期10卷 28-43页

作者： Mariana Bertini Teixeira Marcos Rodrigo Alborghetti j?rg Kobarg Institute of Biology Department of Biochemistry and Tissue Biology University of Campinas Department of Cell Biology University of Brasilia Faculty of pharmaceutical Sciences University of Campinas

Fasciculation and elongation zeta/zygin(FEZ) proteins are a family of hub proteins and share many characteristics like high connectivity in interaction networks, they are involved in several cellular processes, evolve slowly and in general have intrinsically disordered regions. In 1985, unc-76 gene was firstly described and involved in axonal growth in C. elegans, and in 1997 bloom and Horvitz enrolled also the human homologues genes, FEZ1 and FEZ2, in this process. While nematodes possess one gene(unc-76), mammalians have one more copy(FEZ1 and FEZ2). Several animal models have been used to study FEZ family functions like: C. elegans, D. melanogaster, R. novergicus and human *** assays were performed and demonstrated the function conservation between paralogues. Human FEZ1 protein is more studied followed by UNC-76 and FEZ2 proteins, respectively. While FEZ1 and UNC-76 shared interaction partners, FEZ2 evolved and increased the number of protein-protein interactions(ppI) with cytoplasmatic partners. FEZ proteins are implicated in intracellular transport, acting as bivalent cargo transport adaptors in kinesinmediated movement. Especially in light of this cellular function, this family of proteins has been involved in several processes like neuronal development,neurological disorders, viral infection and autophagy. However, nuclear functions of FEZ proteins have been explored as well, due to high content of ppI with nuclear proteins, correlating FEZ1 expression to Sox2 and Hoxb4 gene regulation and retinoic acid signaling. These recent findings open new avenue to study FEZ proteins functions and its involvement in already described *** review intends to reunite aspects of evolution, structure, interaction partners and function of FEZ proteins and correlate them to physiological and pathological processes.

关键词： Hub Intrinsically disordered FEZ protein-protein interaction Neuronal development Retinoic acid signaling Interactomics

耶鲁学派、解构主义及耶鲁学者——j.希利斯·米勒先生访谈

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

外国文学研究 2021年第3期43卷 1-12页

作者：宁一中 j.希利斯·米勒兰秀娟(译) 深圳大学北京语言大学不详中山大学外语学院

j.希利斯·米勒(1928—2021)是当今世界文学批评和文学理论研究领域里最重要的人物之一。其著作与学术生涯有着世界性的影响。他在哈佛大学获得博士学位,而后执教于约翰·霍普金斯大学,耶鲁大学和加州大学尔湾校区,2002年荣退。1986年... 详细信息

j.希利斯·米勒(1928—2021)是当今世界文学批评和文学理论研究领域里最重要的人物之一。其著作与学术生涯有着世界性的影响。他在哈佛大学获得博士学位,而后执教于约翰·霍普金斯大学,耶鲁大学和加州大学尔湾校区,2002年荣退。1986年他作为美国现代语言学会会长,为美国的学术和学术组织做出了重要贡献。作为耶鲁学派的重要代表人物,他与德里达、保罗·德曼、杰弗里·哈特曼和哈罗德·布鲁姆这些当代文学界的巨擘过从甚密。宁一中博士于1997至1998年在他指导下做博士后研究。本访谈就是当时他对米勒先生进行多次访谈的一部分。在这个访谈中,米勒对耶鲁学派做了总体评价,对保罗·德曼、哈罗德·布鲁姆以及法国哲学家加盟的耶鲁"五人帮"做了细致的阐述。诚然,作为同事和密友,他对这几位学者的人格魅力、学术活动等了解得更多更深。从对他的访谈中,我们得以了解解构主义之发轫以及所谓"解构主义宣言"写作之来由;了解由德曼二战期间在纳粹报纸上撰写文章而引起的美国学界唇枪舌剑的辩论;得以知道布鲁姆传奇般的天赋,也让我们能窥他们之间友谊之一斑,这种友谊促成了美国耶鲁学派的建立。因此,访谈内容具有很高的史料价值,为我们了解美国文学理论和文学批评的历史发展提供了珍贵的资料,也为我们做文学研究提供了宝贵的背景资料。如今,这五位学界大师都已作古,这些出自米勒本人的资料便尤显珍贵。哲人其萎,这个访谈也权作对他们的庄严纪念吧。

关键词：米勒耶鲁学派解构主义德里达德曼布鲁姆

维普期刊数据库

克罗恩病活动性评估:MR小肠成像总体评分与粪钙卫蛋白对照研究

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2014年第2期 193-193页

作者： j.C.Makanyanga D.pendsé N.Dikaios S.bloom S.McCartney S.A.Taylor 朱晓明 Department of Specialist Radiology University College London Hospitals Podium Level 2235 Euston Road London UK NW1 Department of Specialist Radiology University College London Hospitals Podium Level 2235 Euston Road London UK NW1 2BU

目的以粪钙卫蛋白(fC)、C-反应蛋白(CRp)及Harvey-Bradshaw指数(HBI)等参考指标为标准,开发MR小肠成像总体评分系统(MEgS)以评估克罗恩病(CD)的活动

关键词：克罗恩病 MRI 钙卫蛋白 C-反应蛋白肠道炎性病变

Comparison of Five Tillage Systems in Coastal plain Soils for Cotton production

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Open journal of Soil Science 2017年第10期7卷 245-258页

作者： Ahmad Khalilian Michael A. jones philip j. Bauer Michael W. Marshall Department of Agricultural Sciences Clemson University Clemson SC USA Department of plant and Environmental Sciences Clemson University Clemson SC USA USDA-ARS Florence SC USA Edisto Research and Education Center Clemson University Blackville SC USA

Soil compaction management in the southeastern USA typically relies heavily on the practice of annual deep tillage. Strip tillage systems have shown considerable promise for reducing energy and labor requirements, equipment costs, soil erosion, and cotton plant damage from blowing sand. Replicated field trials were conducted for three years in South Carolina, to compare the performance of three different strip tillage systems to conventional tillage and no-till methods. A second objective was to investigate whether the frequency of deep tillage can be reduced by planting cotton directly using controlled wheel traffic into the previous year’s subsoiler furrow. Tillage treatments included: conventional tillage (disk-subsoil-bed), straight shank strip-till, bent-leg shank strip-till (paratill), bent-leg shank strip till (Terra Max), and no-till. Deep tillage was performed in all plots the first year. In years two and three, the plots were split and half received annual deep tillage and the other half were not deep tilled either year. Tillage methods were compared side by side with and without irrigation. Deep tillage reduced soil compaction and increased taproot length and cotton yields than the no-till system. There was no difference in cotton lint yield between the strip-till systems and conventional tillage in either dry land or irrigated plots. Deep tillage increased cotton lint yields compared to no-till. There was no difference in lint yield between plots which were deep-tilled in all three years with those which had tillage operation only in first year of the test. Dry matter partitioning at first bloom was reduced in plant height, total dry weight, and leaf area in strip-till and no-till production systems compared to the conventional tillage system. The results suggest that all three strip tillage systems are equally effective for cotton production and that annual deep tillage is not necessary if controlled traffic is employed.

关键词： Tillage Cotton Soil Compaction Controlled Traffic Irrigation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

青海湖的形成与演化趋势

第四纪研究 1990年第3期10卷 233-243页

作者：袁宝印陈克造 j.M.Bowler 叶素娟中国科学院地质研究所中国科学院青海盐湖研究所澳大利亚维多利亚博物馆

青海湖盆地形成于上新世,湖泊至晚在0.5 Ma前已经形成,在初期有流向贵德盆地的出口。湖泊发育主要划分为三个阶段:中更新世湖泊最盛期、晚更新世湖泊稳定期和全新世湖泊收缩期。晚更新世早期由于湖泊强烈沉陷,使河流出口处相对抬高,河... 详细信息

青海湖盆地形成于上新世,湖泊至晚在0.5 Ma前已经形成,在初期有流向贵德盆地的出口。湖泊发育主要划分为三个阶段:中更新世湖泊最盛期、晚更新世湖泊稳定期和全新世湖泊收缩期。晚更新世早期由于湖泊强烈沉陷,使河流出口处相对抬高,河水倒流而形成倒淌河。第四纪以来,我国西北地区有气候逐渐变干的趋势,导致全新世以来青海湖不断收缩。如不采取人工措施,青海湖还将继续收缩。

关键词：青海湖湖泊演化形成

维普期刊数据库