检索结果-南通市图书馆

The Geology of the Everglades and Adjacent Areas Har/DVD

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The technique of utilizing a single gracilis functional muscle transfer to restore quadriceps function following sarcoma surgery

2007年

作者： Petuch, edward j. Roberts, Charles

ISBN: (数字)9781420045598

ISBN: (纸本)9781420045581

Painting a complete picture of the history of the Everglades, The Geology of the Everglades and Adjacent Areas brings together theperspectives of various geoscientists to provides an overview of the geology, paleontology, and paleoceanography of the Everglades region. It emphasizes the upper 300 m of the geologic framework of the area and gi

关键词： Geology

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Plastic and Aesthetic Research 2019年第12期6卷 37-46页

作者： Christopher M.Nguyen Imran Ratanshi jennifer L.Giuffre edward W.Buchel Thomas E.j.Hayakawa Section of Plastic Surgery Department of SurgeryUniversity of ManitobaWinnipeg R3A 1R9Canada The Plastic Surgery Group Fraser Health AuthoritySurreyBritish Columbia V3V 1Z2Canada

Aim:Quadriceps strength and knee extension,the most important factors limiting the ability to rise from a chair,are crucial for walking at an appropriate speed,ascending and descending stairs,and performing activities such as running,dancing,and *** of the anterior compartment of the thigh,including all four quadriceps muscles,for the treatment of a sarcoma is uncommon;however,when necessary,it is very debilitating and adversely affects a patient's quality of life without functional ***,there are a limited number of complex and difficult reconstructions to restore quadriceps function that have been described with variable *** describe a simple technique that employs a single gracilis functional muscle transfer to replace essential quadriceps ***:This is a case series describing the use of either a free or pedicled single gracilis muscle to restore quadriceps function following sarcoma ***:Four patients underwent an anterior compartment sarcoma resection that resulted in a large segmental defect and/or denervation of all four quadriceps muscles such that no quadriceps function would remain without *** four patients underwent a functional reconstruction using a single *** of the living patients achieved British Medical Research Counsel Grade 4 strength,can achieve full knee extension,are able to navigate stairs,and are able to ambulate without a *** fourth patient unfortunately was deceased in under three months following his tumor ***:Despite its small size in comparison to the quadriceps muscles,with physiotherapy and training,the gracilis muscle demonstrates the capacity to hypertrophy and replace quadriceps function following limb salvage surgery.

关键词： Knee extension re-animation functional muscle transfer free flap pedicled flap sarcoma microsurgery quadriceps reconstruction

Exploiting a metal wire grating in total internal reflection geometry to achieve achromatic polarization conversion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2017年第4期5卷 299-304页

作者： XUDONG LIU XUEQUAN CHEN edward P.j.PARROTT EMMA PICKWELL-MACPHERSON Department of Electronic Engineering Chinese University of Hong Kong

We demonstrate how a metal wire grating can work as a 45° polarization converter, a quarter-wave retarder, and a half-wave retarder over a broadband terahertz range when set up in total internal reflection geometry. Classical electromagnetic theory is applied to understand the mechanism, and equations to calculate the polarization state of reflected light are derived. We use a metal grating with a period of 20 μm and width of 10 μm on a fused silica surface: linearly polarized terahertz light incident from fused silica with a supercritical incident angle of 52° is totally reflected by the metal grating and air. The polarization of the terahertz light is rotated by 45°, 90°, and circularly polarized by simply rotating the wire grating. The performance is achromatic over the measured range of 0.1–0.7 THz and comparable to commercial visible light wave retarders.

关键词： THz

Visualization of atomic scale reaction dynamics of supported nanocatalysts during oxidation and ammonia synthesis using in-situ environmental(scanning) transmission electron microscopy

在线全文

学校读者我要写书评

暂无评论

journal of Energy Chemistry 2021年第6期30卷 281-290,I0007页

作者： Michael R.Ward Robert W.Mitchell edward D.Boyes Pratibha L.Gai The York Nanocentre University of YorkYork YO105DDUK Department of Physics University of YorkYork YO105DDUK Department of Electronic Engineering University of YorkYork YO105DDUK Department of Chemistry University of YorkYork YO105DDUK

Reaction dynamics in gases at operating temperatures at the atomic level are the basis of heterogeneous gas-solid catalyst reactions and are crucial to the catalyst *** noble metal nanocatalysts such as platinum are of interest in fuel cells and as diesel oxidation catalysts for pollution control,and practical ruthenium nanocatalysts are explored for ammonia *** and graphitic carbons are of interest as supports for the *** considerable literature on the catalytic processes on graphite and graphitic supports,reaction dynamics of the nanocatalysts on the supports in different reactive gas environments and operating temperatures at the single atom level are not well *** we present real time in-situ observations and analyses of reaction dynamics of Pt in oxidation,and practical Ru nanocatalysts in ammonia synthesis,on graphite and related supports under controlled reaction environments using a novel in-situ environmental(scanning) transmission electron microscope with single atom *** recording snapshots of the reaction dynamics,the behaviour of the catalysts is *** images reveal single metal atoms,clusters of a few atoms on the graphitic supports and the support *** all play key roles in the mobility,sintering and growth of the *** experimental findings provide new structural insights into atomic scale reaction dynamics,morphology and stability of the nanocatalysts.

关键词： In-situ visualization Atomic scale reaction dynamics In-situ environmental scanning transmission electron microscopy with single atom resolution Supported nanoparticles Ammonia synthesis Oxidation reactions

An Adaptive Grouping Scheme in Ultra-Dense IEEE 802.11ax Network Using Buffer State Report Based Two-Stage Mechanism

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第9期16卷 31-44页

作者： jiyang Bai He Fang junghoon Suh Osama Aboul-Magd edward Au Xianbin Wang Department of Electrical and Computer Engineering Western UniversityLondonON N6A 5B9Canada Huawei Technologies Canada Co. LTD.OttawaON K2K 3J1Canada

IEEE 802.11ax,which is an emerging WLAN standard,aims at providing highly efficient communication in ultra-dense wireless ***,due to a large number of stations(STAs)in the ultra-dense device deployment scenarios,the potentially high packet collision rate significantly decreases the communication efficiency of *** this paper,we propose an adaptive STA grouping scheme to overcome this dense network challenge in IEEE 802.11ax by using Buffer State Report(BSR)based Two-stage Mechanism(BTM).In order to achieve the optimal efficiency of BSR delivery,we analyze the functional relationship between STA number in group and Resource Unit(RU)*** on this analysis results,an adaptive STA grouping algorithm with variable group size is proposed to achieve efficient grouping in *** numerical results demonstrate that the proposed adaptive BTM grouping algorithm significantly improves the BSR delivery efficiency and the throughput of overall system and each STA in the ultra-dense wireless network.

关键词： IEEE 802.11ax Orthogonal Frequency-Division Multiple Access (OFDMA),Buffer Status Report (BSR) Uplink OFDMARandom Access (UORA) Grouping

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

Aged rat heart: Modulation of age-related respiratory defects decreases ischemic-reflow injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Health 2013年第1期5卷 1-7页

作者： edward j. Lesnefsky Charles L. Hoppel Center for Mitochondrial Diseases Departments of Medicine and Pharmacology Case Western Reserve University Cleveland USA Departments of Medicine Biochemistry and Physiology Virginia Commonwealth University and McGuire Veterans Affairs Medical Center Richmond USA

Myocardial injury increases in the elderly heart during ischemia and reperfusion. Mitochondria, the key targets and sources of injury during ischemia and reperfusion, sustain ischemic damage to the electron transport chain that is superimposed upon age-related defects. In the adult heart, interventions to activate endogenous cytoprotective signaling systems meet in mitochondria to decrease cardiac injury. Unfortunately, these systems are largely ineffective in the aged heart. Thus, new treatment concepts are needed to reduce injury in the aged heart. Our group chose a strategy to directly treat the effector of cardiac injury in the aged heart, the mitochondria. We further utilized a novel approach to ask if the reversal of aging defects in cardiac mitochondria before ischemia could decrease ischemia-reperfusion injury in the heart. Three hours following treatment with the small molecule, nutriceutical acetylcarnitine (AcCN), oxidative phosphorylation as well as age-induced defects in electron transport chain complexes III and IV was corrected in the heart. When such hearts were then exposed to ischemia and reperfusion, cardiac injury was markedly reduced. Contraction during reperfusion improved and recovery became similar to that in adult hearts. Cardiac cell death was substantially reduced. Thus, age-related defects in electron transport are a key mechanism of the increased myocardial injury in the elderly heart during ischemia and reperfusion. Modulation of aging-induced defects in mitochondrial metabolism reduces cardiac injury from ischemia and reperfusion, and is a novel strategy to protect myocardium in the elderly patient at risk for an acute myocardial infarction.

关键词： Mitochondria Cytochrome Oxidase Complex III Myocardial Infarction Aging

Relationship between Physical and Chemical Soil Attributes and Plant Species Diversity in Tropical Mountain Ecosystems from Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Mountain Science 2014年第4期11卷 875-883页

作者： Ferna de CARVALHO edward Luis GODOY Francy j. G. LISBOA Fatima Maria de Souza MOREIRA Francisco Adriano de SOUZA Ricardo Luis Louro BERBARA G Wilson FERNES Laboratory of Evolutionary Ecology and Biodiversity Department of Geral Biology Institute of Biology Sciences Federal University of Minas Gerais Belo Horizonte MG 30161-901 P.O. Box 486 Brazil Department of Biology Microbiology and Biological Processes Department of Soil Science Federal University of LavrasLavras Minas Gerais 37200-000 P.O.Box 3037 Brazil Department of Biological Sciences Ferderal University of S?o Jo?o Del Rei S?o Jo?o del-Rei Minas Gerais 36307-352Brazil Laboratory of Soil Biology Department of Soil Science Federal Rural University of Rio de Janeiro Seropédica Rio de Janeiro 23890-000 Brazil Embrapa Maize and Sorghum Center for Applied Biology Rod. MG 424 KM 45 Caixa Postal Sete Lagoas Minas Gerais 35701-970 P.O. Box 285 Brazil

Although the high diversity of plant species in the rupestrian fields has been primarily attributed to the existence of a set of distinct habitats, few studies support this assertion. The present study aimed to further investigate the relationship between physical and chemical attributes of soils with the diversity of plant species in this unique ecosystem. The rupestrian field is a unique vegetation formation that covers some of the southeastern Brazilian mountains in the transition of the Atlantic rain forest and the Cerrado(savanna). Different habitats occur according to soil characteristics(e.g., presence of rocks, sand, fertility, hydrology, etc.). These attributes ultimately influence the vegetation that is highly adapted to the harsh edaphic and climatic mountain conditions. Five distinct habitats were studied by us: rocky outcrops, peat bogs, sandy bogs, quartz gravel fields, and "cerrado"(savanna). A floristic survey indicated that four families are found at greater frequency: Poaceae, Asteraceae, Cyperaceae, and Leguminosae. The greatest diversity of plant species was found in the rocky outcrops habitat, followed by cerrado, peat bog, quartz gravel grassland, and sandy bogs, respectively. The main difference in the floristic composition among these habitats was related to the dominant species. Trachypogon spicatus(Poaceae) was the most dominant species in the rocky outcrops, Axonopus siccus(Poaceae) in the peat bogs, Lagenocarpus rigidus(Cyperaceae) in the sandy bogs, Schizachyrium tenerum(Poaceae) in the cerrado, while Vellozia sp. 8(Velloziaceae) dominated the vegetation in the quartz gravel grassland. This study demonstrated that physical and chemical soil properties strongly related the diversity of plant species occurring in the different habitats of rupestrian fields.

关键词： Floristic diversity Plant-soilrelationships Espinhaqo Range Biodiversity Mountain ecology Plant habitat

含硫化物镁铁质-超镁铁质侵入体中橄榄石Mg、Ni含量的制约:原理、模式及Voisey's Bay侵入体样品研究(英文)

在线全文

学校读者我要写书评

暂无评论

地学前缘 2007年第5期14卷 177-185页

作者： Anthony j.Naldrett edward M.Ripley Department of Geology University of TorontoToronto M5S 3B1Canada Department of Earth Sciences Indiana UniversityBloomingtonIN 47405USA

镁铁质-超镁铁质岩浆结晶分离早期形成镁铁矿物,镁铁矿物中的Ni和Mg是相容元素。随着结晶分离作用的进行,Ni、Mg在硅酸盐岩浆及后形成的硅酸盐物质中的丰度下降。橄榄石中Ni含量及硅酸盐物质MgO/FeO比值都与母岩浆的相关值相关,据此可... 详细信息

镁铁质-超镁铁质岩浆结晶分离早期形成镁铁矿物,镁铁矿物中的Ni和Mg是相容元素。随着结晶分离作用的进行,Ni、Mg在硅酸盐岩浆及后形成的硅酸盐物质中的丰度下降。橄榄石中Ni含量及硅酸盐物质MgO/FeO比值都与母岩浆的相关值相关,据此可推断母岩浆的信息,它们之间可由实验测得的系数相联系。当岩浆饱和硫化物时,在结晶分离过程中硫化物珠滴会与镁铁硅酸盐物质一道析出,同时,与硫化物非饱和岩浆相比,过多的Ni会随之析出。这也反映在Ni、Mg含量比无硫化物分离时有更迅速的降低上。Ni、Mg含量变化值可以在VoiseysBay侵入体的模式曲线上反映出,加拿大Labrador的这一侵入体赋存了一个世界级的Ni-Cu-Co硫化物矿床。过去的作法是将侵入体中橄榄石的Ni、Mg含量与Simkin和Smith得出的各种火成岩中橄榄石的Ni、Mg含量相比较以确定Ni亏损,进而假定橄榄石来自硫化物饱和、有经济价值的岩浆。现在的研究显示这种简单的对比会导致错误。将样品数据与模式曲线对比并反映出侵入体矿物结晶堆积特征是重要的方法。使用这一方法,样品数据能很好地被模式曲线拟合。以在VoiseysBay的研究为例,当硫化物液相与硅酸盐矿物被去除后,硫化物非饱和的分离作用期就会显现出来,随后是硅酸盐结晶作用期。

关键词：橄榄石镍基性-超基性岩浆硫化物矿床