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RISS 인기검색어
- 검색키워드
- 저자 : Gullans, Stephen (검색결과 4 건)
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In Park, Kook,Hack, Michael A.,Ourednik, Jitka,Yandava, Booma,Flax, Jonathan D.,Stieg, Philip E.,Gullans, Stephen,Jensen, Francis E.,Sidman, Richard L.,Ourednik, Vaclav,Snyder, Evan Y. Elsevier 2006 Experimental neurology Vol.199 No.1
<P><B>Abstract</B></P><P>Clonal neural cells with stem-like features integrate appropriately into the developing and degenerating central and peripheral nervous system throughout the neuraxis. In response to hypoxic–ischemic (HI) injury, previously engrafted, integrated, and quiescent clonal neural stem cells (NSCs) transiently re-enter the cell cycle, migrate preferentially to the site of ischemia, and differentiate into neurons and oligodendrocytes, the neural cell types typically lost following HI brain injury. They also replenish the supply of immature uncommitted resident stem/progenitor cells. Although they yield astrocytes, scarring is inhibited. These responses appear to occur most robustly within a 3–7 day “window” following HI during which signals are elaborated that upregulate genetic programs within the NSC that mediate proliferation, migration, survival, and differentiation, most of which appear to be terminated once the “window closes” and the chronic phase ensues, sending the NSCs into a quiescent state. These insights derived from using the stem cell in a novel role – as a “reporter” cell – to both track and probe the activity of endogenous stem cells as well as to “interrogate” and “report” the genes differentially induced by the acutely vs. chronically injured milieu. NSCs may be capable of the replacement of cells, genes, and non-diffusible factors in both a widespread or more circumscribed manner (depending on the therapeutic demands of the clinical situation). They may be uniquely responsive to some types of neurodegenerative conditions. We submit that these various capabilities are simply the normal expression of the basic homeostasis-preserving biologic properties and attributes of a stem cell which, if used rationally and in concert with this biology, may be exploited for therapeutic ends.</P>
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Takumasa Kondo,Penny J. Gullan,Robert W. Pemberton 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.1
A new species of lac insect, Paratachardina javanensis Kondo and Gullan, sp. nov. (Hemiptera: Coccoidea:Kerriidae), is described and illustrated from a collection on Myrica rubra Siebold and Zucc. (also called Morella rubra Lour., Myricaceae) in West Java, Indonesia. This lac insect species is most similar morphologically to the pestiferous lobate lac scale, Paratachardina pseudolobata Kondo and Gullan. A comparison of the two species and an updated taxonomic key to all named Paratachardina species are provided.
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Gabor Neumann,Dennis J. O'Dowd,Penny J. Gullan,Peter T. Green 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.1
Pulvinaria urbicola Cockerell, a pulvinariine soft scale (Hemiptera: Coccidae), is a broad host-plant generalist, produces honeydew and is commonly tended by ants, including the invasive yellow crazy ant Anoplolepis gracilipes Smith and big-headed ant Pheidole megacephala (Fabricius). Pu. urbicola is implicated in dieback of forest dominated by Pisonia grandis (Nyctaginaceae) on many Indo-Pacific islands. Here we report detection of Pu. urbicola on Christmas Island (Indian Ocean), describe the potential impacts of the association of this trophobiontwith introduced ants, and briefly outline biosecurity and management issues. On Christmas Island, Pu. urbicola represents a threat to stands of Pi. grandis, potentially threatens the dominant forest tree Pi. umbellifera, and could exacerbate supercolony formation and impacts of the yellow crazy ant.
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Gabor Neumann,Dennis J. O'Dowd,Penny J. Gullan,Peter T. Green 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.1
Detailed assessment of scale insect (Hemiptera: Coccoidea) faunas on islands may help predict impacts of invasive ants (Hymenoptera: Formicidae) and informoptions for theirmanagement, including biological control.Mutualism between scale insects and the invasive ant Anoplolepis gracilipes on Christmas Island, Indian Ocean, threatens the conservation of the island's endemic land crab fauna, alters rainforest structure and composition, and disrupts ecosystem processes. Diversity and endemism of the scale insect fauna were assessed through broad survey across rainforest, targeted search on endemic plant species, and inspection of ornamental and horticultural plants in settled areas. Emphasis was placed on honeydew-producing species that sustain ant supercolonies and detection of endemic scale insects that could be non-target species in a biological control programme for honeydew-producing scale insects. Origins of the fauna were inferred using scale insect databases and interception records at Ports-of-Entry for the United States and Korea. Twenty-eight scale insect species in seven families are identified for the island. Four honeydew-producing species, the lac scale Tachardina aurantiaca (Kerriidae) and three soft scale species (Coccidae), are abundant in rainforest and tended by ants. No endemic species were found. Compositionally, the scale insect fauna resembles that of many other tropical islands: almost all species are biogeographically widespread, host-plant generalists, and routinely intercepted in humanmediated dispersal pathways. The likely source bioregion is Sundaland where 27 of the 28 species on the island have been recorded andwhich has been the major pathway for movement of plant material to the island for over a century.
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