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Differentiation and functional connectivity of fetal tectal transplants

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Neural regeneration research 2023年第11期18卷 2325-2331页

作者： Alan r.harvey School of Human Sciences The University of Western AustraliaLions Eye Instituteand Perron Institute for Neurological and Translational ScienceNedlandsWAAustralia

Data from studies analyzing the differentiation and functional connectivity of embryo nic neural tissue grafted into the mammalian nervous system has led to the clinical testing of the fetal graft approach in patients with neurodegenerative *** some success has been achieved,ethical concerns have led to a search for alternative therapeutic strategies,mostly exploring the use of neural precursors or neurons derived from pluripotent stem cells to replace damaged host neurons and restore lost *** more recent studies address questions of graft viability,differentiation,and connectivity similar to those posed by researchers in earlier fetal transplant work,thus reviews of the fetal graft literature may inform and help guide ongoing research in the stem cell/organoid *** brief review describes some key observations from research into the transplantation of neural tissue into the rat visual syste m,focusing on grafts of the fetal supe rior colliculus(tectal grafts) into neonatal or adult *** neonate hosts,grafts quickly develop connections with the underlying host mid b rain and attain a morphology typical of mature grafts by about 2 weeks.G rafts consistently contain numerous localized regions which,based on neurofibrillar staining,neuronal morphology(Golgi),neurochemistry,receptor expression,and glial architecture,are homologous to the stratum griseum supe rficiale of normal superior *** localized "patches" are also seen after explant culture and when donor tectal tissue is dissociated and reaggregated prior to *** almost all circumstances,host retinal innervation is restricted to these localized patches,but only those that are located adjacent to the graft surfa *** are formed and there is evidence of functional *** only exception occurs when Schwann cells are added to dissociated tecta prior to *** these co-grafts,the peripheral glia appear to compete with local target fa ctors a

关键词： axon regeneration differentiation embyronic grafts fetal tissue neural precursors retinotectal stem cells superior colliculus synaptogenesis transplantation

Silicification in Mississippian Lodgepole Formation,Northeastern Flank of Williston Basin,Manitoba,Canada

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Journal of Earth Science 2012年第1期23卷 1-18页

作者： harvey r Young Moe Kuroda Department of Geology Brandon University

Five types of replacement silica are recognized in the Lower Mississippian Virden Member carbonates on the northeastern flank of Williston basin： microcrystalline quartz, chalcedonic quartz, anhedral megaquartz, euhedral megaquartz, and stringy megaquartz. Silica tends to replace various bioclasts, and all except the stringy megaquartz also occur as non-replacive void-filling cement or as silica forming chert nodules and silicified limestone. Although crinoids, brachiopods, corals, bryozoans, molluscs, trilobites, forams, and ostracodes are present in the sediments studied, only the first three show evidence of silicification. Crinoids are commonly replaced by microcrystalline quartz whereas brachiopods typically by spherules of length slow chalcedony. Coalesced spherules, often in concentric rings （beekite rings）, may form sheet-like masses on the surface of corals and brachiopods. Although bryozoans are common in the Virden Member, none showed any evidence of silicification. The difference in the susceptibility to silicification may be related to the shell microstructure, biological group, size of organism, skeletal mineralogy, and organic content of the bioclasts. Biogenic silica derived from the dissolution of siliceous sponge spicules is considered to be the most likely silica source for silicification. Most silica is believed to be released during early diagenesis before the sediments were deeply buried. The Virden Member carbonate may have experienced two episodes of replacement, the first affecting the bioclasts, the second producing silicified limestone and chert nodules.

关键词： silicification Williston basin Lodgepole Formation Virden Member Mississippian carbonate.

A Brief review of Elasticity and Viscoelasticity for Solids

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Advances in Applied Mathematics and Mechanics 2011年第1期3卷 1-51页

作者： harvey Thomas Banks Shuhua Hu Zackary r.Kenz Center for research in Scientific Computation and Department of Mathematics North Carolina State UniversityRaleighNC 27695-8212USA

There are a number of interesting applications where modeling elastic and/or viscoelastic materials is fundamental,including uses in civil engineering,the food industry,land mine detection and ultrasonic *** we provide an overview of the subject for both elastic and viscoelastic materials in order to understand the behavior of these *** begin with a brief introduction of some basic terminology and relationships in continuum mechanics,and a review of equations of motion in a continuum in both Lagrangian and Eulerian *** complete the set of equations,we then proceed to present and discuss a number of specific forms for the constitutive relationships between stress and strain proposed in the literature for both elastic and viscoelastic *** addition,we discuss some applications for these constitutive ***,we give a computational example describing the motion of soil experiencing dynamic loading by incorporating a specific form of constitutive equation into the equation of motion.

关键词： Mathematical modeling Eulerian and Lagrangian formulations in continuum mechanics elasticity viscoelasticity computational simulations in soil constitutive relationship

Structural and Mechanistic Aspects of Mn-oxo and Co-based Compounds in Water Oxidation Catalysis and potential Applications in Solar Fuel production

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Journal of Integrative plant Biology 2010年第8期52卷 704-711页

作者： harvey J.M.Hou Department of Chemistry and Biochemistry University of Massachusetts Dartmouth North Dartmouth

To address the issues of energy crisis and global warming, novel renewable carbon-free or carbon-neutral energy sources must be identified and developed. A deeper understanding of photosynthesis is the key to provide a solid foundation to facilitate this transformation. To mimic the water oxidation of photosystem II oxygen evolving complex, Mn-oxo complexes and Co-phosphate catalytic material were discovered in solar energy storage. Building on these discoveries, recent advances in solar energy conversion showed a compelling working principle by combing the active Mn-oxo and Co-based catalysts in water splitting with semiconductor heteronanostructures for effective solar energy harnessing. In this review the appealing systems including Mn-oxo tetramer/Nafion, Mn-oxo dimer/TiO2, Mn-oxo oligomer/WO3, Co-pi/Fe2O3, and Co-pi/ZnO are summarized and discussed. These accomplishments offer a promising framework and have a profound impact in the field of solar fuel production.

关键词： Mn Structural and Mechanistic Aspects of Mn-oxo and Co-based Compounds in Water Oxidation Catalysis and potential Applications in Solar Fuel production II Figure

resolution beyond classical limits with spatial frequency heterodyning

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Chinese Optics Letters 2006年第3期4卷 148-151页

作者： A.Mudassar A.r.harvey A.H.Greenaway J.D.C.Jones School of Engineering and physical Sciences Heriot-Watt UniversityUK

A technique for coherent imaging based on spatial frequency heterodyning is described. Three images corresponding to three physical measurements are recorded. For the first measurement, a scene is simply illuminated with a coherent beam and for measurements 2 and 3, the scene is projected with cosine and sine fringes, respectively. Due to spatial frequency heterodyning, upper and lower side hand information falls in the pass band of the imager. These bands are separated and correct phases and positions are assigned to these bands in the spatial frequency domain. An extension of bandwidth is achieved in the frequency domain and the inverse frequency domain data then give a high resolution coherent image.

关键词： resolution beyond classical limits with spatial frequency heterodyning

Effect of host-cocoon mass on adult size in the secondary hyperparasitoid wasp, pteromalus semotus （Hymenoptera： pteromalidae）

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Insect Science 2012年第3期19卷 383-390页

作者： Jeffrey A. harvey Alex Gumovsky rieta Gols Netherlands Institute of Ecology Department of Terrestrial Ecology Wageningen The Netherlands Schmalhausen Institute of Zoology Kiev Ukraine Laboratory of Entomology Plant Science Group Wageningen University Wageningen The Netherlands

parasitoids have long proven to be model organisms in studying resourcerelated constraints on immature development. Here we examine the relationship between host cocoon （= pupal） size in the gregarious endoparasitoid wasp, Cotesia glomerata, and development time and adult size in the solitary idiobiont hyperparasitoid, pteromalus semotus. Little is known about the biology or ecology of this ecto-hyperparasitoid species, although it is one of the major secondary hyperparasitoids of C. glomerata. The size of the adult wasp covaried with the size of the host cocoon at parasitism. Moreover, female wasps were larger than male wasps for a given cocoon size. Adult wasps have remarkably long life-spans, 3 months on average. Longevity did not significantly differ with sex. We also examined how larvae of p. semotus exclude other potential competitors. p. semotus is protandrous, with females taking significantly longer to complete their development than males. In experiments where several eggs of p. semotus were placed on individual pupae of C. glomerata, newly hatched hyperparasitoid larvae moved rapidly over the surface of the host and destroyed the eggs of any conspecifics by biting them before they would initiate feeding on host tissues. Our results are discussed in relation to those with other studies with solitary ichneumonid idiobiont hyperparasitoids of C. glomerata.

关键词： Cotesia glomerata growth idiobiont longevity protandry trade-off

Mitochondrial Composition,Function and Stress response in plants

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Journal of Integrative plant Biology 2012年第11期54卷 887-906页

作者： richard p. Jacoby Lei Li Shaobai Huang Chun pong Lee A. harvey Millar Nicolas L. Taylor ArC Centre of Excellence in plant Energy Biology Centre for Comparative Analysis of Biomolecular Networks (CABiN) MCS Building M316 The University of Western Australia 35 Stirling Highway Crawley WA 6009 Western Australia Australia Department of plant Sciences University of Oxford South Parks Road Oxford OX1 3RB United Kingdom

The primary function of mitochondria is respiration, where catabolism of substrates is coupled to ATp synthesis via oxidative phosphorylation. In plants, mitochondrial composition is relatively complex and flexible an... 详细信息

关键词： plant mitochondria respiration oxidative stress electron transport chain complex assembly rOS signaling carbon.

An efficient method for unfolding kinetic pressure driven VISAr data

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High power Laser Science and Engineering 2015年第3期3卷 50-58页

作者： M.Hess K.peterson A.harvey-Thompson Sandia National Laboratories

Velocity Interferometer System for Any reflector(VISAr) [Barker and Hollenbach, J. Appl. phys. 43, 4669(1972)]is a well-known diagnostic that is employed on many shock physics and pulsed-power experiments. With the VISAr diagnostic, the velocity on the surface of any metal flyer can be found. For most experiments employing VISAr, either a kinetic pressure [Grady, Mech. Mater. 29, 181(1998)] or a magnetic pressure [Lemke et al., Intl J. Impact Eng. 38,480(2011)] drives the motion of the flyer. Moreover, reliable prediction of the time-dependent pressure is often a critical component to understanding the physics of these experiments. Although VISAr can provide a precise measurement of a flyer's surface velocity, the real challenge of this diagnostic implementation is using this velocity to unfold the timedependent pressure. The purpose of this paper is to elucidate a new method for quickly and reliably unfolding VISAr data.

关键词： laser driven blast wave pulsed-power VISAr

Ecological civilization: China's effort to build a shared future for all life on Earth

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National Science review 2021年第7期8卷 8-12页

作者： Fuwen Wei Shuhong Cui Ning Liu Jiang Chang Xiaoge ping Tianxiao Ma Jing Xu ronald r.Swaisgood harvey Locke CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Center for Evolution and Conservation Biology Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) Center for Excellence in Animal Evolution and Genetics Chinese Academy of Sciences Chinese research Academy of Environmental Sciences Beyond the Aichi Targets Task Force IUCN World Commission on Protected Areas

After hundreds of years of technological revolution and rapid development, humanity has reached a moment of crisis in its relationship with nature [1]. To find better solutions to address global challenges, holistic thinking is required to integrate environmental goals with human activities. Some of these approaches include sustainable development (SD), the planetary boundaries (pB) and, in China,ecological civilization (EC) based on the unity of nature and man (UNM)[2].

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