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Filters: Date: "1993" Department: "Biology" Collection: ir_uspace
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CreatorTitleDescriptionSubjectDate
1 Davidson, Diane W.Ant-plant symbioses in Africa and the neotropics : history, biogeography and diversitySymbiotic ant-plant relationships afford an excellent opportunity to analyze the effects of both historical and ecological factors on the evolution of mutualisms. Occurring in tropical forests throughout the world, all myrmecophytic plants provide food and permanent housing to ants; the ants, in t...Ant-plant symbiosis; Africa; Neotropics; Myrmecophytes; Plant-ants1993
2 Bastiani, MichaelCell-cell interactions during the migration of an identified commissural growth cone in the embryonic grasshopperOne of the fascicles of the posterior commissure of the embryonic grasshopper is pioneered by an individually identifiable neuron named Q1. Q1 initially grows along a longitudinal pathway established by another pioneer neuron, MPl, and then crosses to the midline, where it meets and fasciculates wi...Commissure; Pathfinding; Filopodia1993
3 Coley, Phyllis D.; Kursar, Thomas A.Colonization of tropical rain forest leaves by epiphylls: effects of site and host plant leaf lifetimeIn humid tropical regions, leaves are frequently colonized by epiphylls (Richards 1954, Pocs 1978, 1982). Lichens and liverworts usually dominate, although mosses, algae, and cyanobacteria can also occur (Winkler 1971, Smith 1982). The interactions between epiphylls and host leaves have not been wel...Tropical forest; Epiphylls; Panama; Hybanthus prunifolius; Light interception1993
4 Clayton, Dale H.Common grackle anting with lime fruit and its effect on ectoparasitesAnting is stereotyped behavior in which birds ex- pose themselves to fluid-secreting ants or other pun- gent substances. During "active" anting a bird crush- es an ant in the bill and rubs it frenetically through its plumage (Rothschild and Clay 1952). During "passive" anting a bird entices ants to ...Quiscalus quiscala; Columbicola columbae; Anting; Ectoparasites1993
5 Olivera, Baldomero M.; McIntosh, J. MichaelConus peptides as tools for the neuroscientistRecombinant DNA technology has had a powerful impact on understanding receptors and ion channels, the key components in the nervous system that are involved in intercellular communication. Cloning genes encoding these proteins has revealed that for every receptor and ion channel type, multiple molec...Conus peptides; Conotoxins1993
6 Bohs, Lynn A.Cyphomandra (Solanaceae)Cyphomandra betacea (Cavanilles) Sendtner Syn. Cyphomandra crassifotia (Ortega) Kuntze, Solanum betacea Cavanilles, Solanwn crassifolium Ortega. Ref. FB 13(5B/1) 1962: 12; Bohs, 1986: 170. Cultivated tree. Andean II. 1000-3000 m. Voucher: Nunez et al. 8257 (MO!) Depts.: AM, CU, HU, SMCyphomandra; Solanum1993
7 Beckerle, Mary C.Evidence for the selective association of a subpopulation of GPIIb-IIIa with the actin cytoskeletons of thrombin-activated plateletsActivation of blood platelets triggers a series of responses leading to the formation and retraction of blood clots. Among these responses is the establishment of integrin-mediated transmembrane connections between extracellular matrix components and the actin cytoskeleton of the platelet.Actin; GPIIb-IIIa1993
8 Davidson, Diane W.Evolutionary ecology of symbiotic ant-plant relationshipsAbstract.--A tabular survey of ant-plant symbioses worldwide summarizes aspects of the evolutionary ecology of these associations. Remarkable similarities between ant-plant symbioses in disjunct tropical regions result from convergent and parallel evolution of similarly preadapted ants and plants. ...Symbioses; Evolution; Taxonomic1993
9 Bastiani, MichaelGrowth cone dynamics during the migration of an identified commissural growth coneWe have used time-lapse video microscopy to study the behavior of a neuron, 01, that pioneers the posterior commissure of the embryonic grasshopper. Our goal is to use time-lapse video as a tool to acquire a precise picture of normal development over time, and thereby identify stereotypic activities...Time-lapse video; Commissure; Grasshopper; Pathfinding; Filopodia; Confocal microscopy; Adhesion1993
10 Olivera, Baldomero M.; ; McIntosh, J. MichaelLocalization of [125I] ω-conotoxin GVIA binding in human hippocampus and cerebellumTHE peptide toxin ω-conotoxin GVIA (ω-CgTx) has been shown to be a high affinity ligand for N-type calcium channels in the brain. We have employed [125I]ω-CgTx to localize N-type channels in human hippocampus and cerebellum using autoradiography. Ten micron thick slidemounted tissue sections of...Conotoxins; Peptide toxins1993
11 Adler, Frederick R.Migration alone can produce persistence of host-parasitoid modelsIt has long been recognized that the unstable equilibrium of a single-patch predator-prey model cannot be stabilized by diffusive coupling with identical patches, since the coupled system acts exactly like the single-patch system if the patches are synchronized (Maynard Smith 1974; Allen 1975; Reeve...Heterogeneity; Nicholson-Bailey; migration rates1993
12 Ehleringer, James R.Seedling size and survival for Chrysothamnus nauseosusSeedling size and survival in relation to summer drought were examined for Chrysothamnus nauseosus growing under field and greenhouse conditions. In the field, summer survival rates were less than 2% annually for the three years monitored. The effect of initial seedling height on subsequent survival...Chrysothamnus nauseosus; Seedling size; Seedling survival1993
13 Sperry, John S.Winter xylem embolism and spring recovery in Betula cordifolia, Fagus grandifolia, Abies balsamea, and Picea rubensXylem embolism was monitored from mid-winter to mid-summer in four co-occurring species: Betula cordifolia (Reg.) Fern., Fagus grandifolia Ehrh., Abies balsamea (L.) Mill., Picea rubens Sarg. The study site was a west-facing slope in the northern Green Mountains of Vermont, U.S.A.; Betula and conife...Conductivity; Hydraulic; Trees1993
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