Life Sciences Commons^™

Peritrophic Membrane Of The Penaeid Shrimp, Sicyonia Ingentis; Structure, Formation And Permeability., Gary Martin

Gary Martin

Peritrophic membranes (PTMs) are secreted acellular layers that separate ingested materials from the gut epithelium in a variety of invertebrates. In insects and crustaceans, PTMs are produced in the midgut trunk (MGT, or intestine), but the MGT in decapod crustaceans, unlike that of insects, is not involved with digestion or absorption of food. We demonstrate that the PTM in the penaeid shrimp Sicyonia ingentis is similar to that in other crustaceans that have been studied and is primarily composed of chitin. The lectin WGA binds only to the PTM and glycocalyx along the microvilli of the midgut cells, which is …

Disarming The Paradox Of Sublethal-Plant Defense Against Insects: Trirhabda Virgata Larval Development Time And Leaf Tissue Loss On Solidago Altissima, Warren Abrahamson, M.J. Wise, R.J. Fox

Warren G. Abrahamson, II

No abstract provided.

Fecundity, Reproductive Ecology, And Influence Of Precipitation On Clutch Size In The Western Slimy Salamander (Plethodon Albagula), Joseph Milanovich

Joseph Milanovich

We investigated the reproductive ecology of the western slimy salamander (Plethodon albagula) in an abandoned mine shaft in the Ouachita National Forest of south-central Arkansas. The mine habitat provided an opportunity to observe nesting behavior, quantify reproductive output, and evaluate the influence of precipitation on fecundity for a population of P. albagula that utilize this particular mine shaft to brood and defend egg clutches. We collected reproductive data on 372 clutches between 1982 and 2004. There was no relationship between the number of eggs per egg clutch versus egg size; snout–vent length, body mass, and tail length were not correlated …

First Record Of Macrolabis (Diptera: Cecidomyiidae) In America: A New Inquiline Species From Dasineura Folliculi Galls On Goldenrods, Warren Abrahamson, N. Dorchin, E.R. Scott

Warren G. Abrahamson, II

No abstract provided.

Edaphic Environment, Gall Midges, And Goldenrod Clonal Expansion In A Mid-Successional Old Field, Warren Abrahamson, M.J. Wise, K. Landis

Warren G. Abrahamson, II

No abstract provided.

Endothelial Cell Cortactin Coordinates Icam-1 Clustering And Actin Cytoskeleton Remodeling During Polymorphonuclear Leukocyte Adhesion And Transmigration, Jennifer Kowalski

Jennifer Kowalski

Endothelial cell ICAM-1 interacts with leukocyte beta2 integrins to mediate adhesion and transmit outside-in signals that facilitate leukocyte transmigration. ICAM-1 redistribution and clustering appear necessary for leukocyte transmigration, but the mechanisms controlling ICAM-1 redistribution and clustering have not been identified. We recently reported that Src kinase phosphorylation of endothelial cortactin regulates polymorphonuclear cell (PMN) transmigration. In this study, we tested the hypotheses that the Src family kinase-cortactin pathway mediates association of ICAM-1 with the actin cytoskeleton and that this association is required for ICAM-1 clustering and leukocyte transmigration. Cross-linking ICAM-1 induced cytoskeletal remodeling and a decrease in ICAM-1 lateral mobility, …

Costs And Benefits Of Gregarious Feeding In The Meadow Spittlebug, Philaenus Spumarius, Warren Abrahamson, M.J. Wise, D.L. Kieffer

Warren G. Abrahamson, II

No abstract provided.

Post-Fire Canopy Recovery In Two Fire-Adapted Palms, Serenoa Repens And Sabal Etonia (Arecaceae), Warren Abrahamson, C.R. Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Ecology Of Marine Fishes : California And Adjacent Waters, Larry Allen, Daniel Pondella, Michael Horn

Daniel Pondella

Fundamental ideas in marine ecology have emerged from the study of marine fishes. This unique, authoritative, and accessible reference, compiled by 35 luminary ecologists, evolutionary biologists, and ichthyologists, provides the first-ever synthesis and interpretation of the large, often daunting, body of information on the ecology of marine fishes. Comprehensive and generously illustrated, this volume focuses on the fauna of the eastern pacific, paying particular attention to the California coast, which is among the most diverse and best studied of all marine ecosystems.

Tailor-Made Composite Functions As Tools In Model Choice: The Case Of Sigmoidal Vs Bi-Linear Growth Profiles, Winfried Peters, Tobias Baskin

Winfried S. Peters

The Effect Of Environmental Parameters And Cyanobacterial Blooms On Phytoplankton Dynamics Of A Portuguese Temperate Lake, Daniela De Figueiredo, Ana Reboleira, S. Antunes, N. Abrantes, U. Azeiteiro, F. Gonçalves, M. Pereira

Ana Sofia P.S. Reboleira

The increasing occurrence of cyanobacterial blooms in freshwaters is of great concern due to the ability of many cyanobacteria to produce cyanotoxins. In the present work, the eutrophied Vela Lake (Central Portugal), used for recreational purposes and as a water source for agriculture, was monitored every fortnight between 2000 and 2001. Phytoplankton diversity and densities were measured and correlated to environmental parameters. A seasonal phytoplanktonic succession was observed and it was mainly correlated with conductivity, temperature, total suspended solids and nutrients availability (particularly phosphorus). Diatoms were dominant during winter months (inferior temperatures and higher nutrients availability) followed by green algae …