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Articles 1 - 17 of 17
Full-Text Articles in Life Sciences
Morphology Of The Midgut Trunk In The Penaeid Shrimp, Sicyonia Ingentis, Highlighting Novel Nuclear Pore Particles And Fixed Hemocytes., Gary G. Martin, Alice Chiu
Morphology Of The Midgut Trunk In The Penaeid Shrimp, Sicyonia Ingentis, Highlighting Novel Nuclear Pore Particles And Fixed Hemocytes., Gary G. Martin, Alice Chiu
Gary Martin
The morphology of the midgut trunk (MGT) in the penaeid shrimp Sicyonia ingentis was examined by light and scanning and transmission electron microscopy. Although the function of the MGT is poorly understood, it is not involved with the digestion and absorption of nutrients, and it appears to be the surface of a shrimp least protected from penetration by potential pathogens. As described for other decapod crustaceans, the MGT in shrimp is composed of a simple columnar epithelium separated from a layer of connective tissue by a thick basal lamina. Beneath the basal lamina is a previously unreported layer of hemocytes, …
The Phylogeny Of Paralabrax (Perciformes: Serranidae) And Allied Taxa Inferred From Partial 16s And 12s Mitochondrial Ribosomal Dna Sequences, Daniel Pondella, Matthew Craig, Jens Frank
The Phylogeny Of Paralabrax (Perciformes: Serranidae) And Allied Taxa Inferred From Partial 16s And 12s Mitochondrial Ribosomal Dna Sequences, Daniel Pondella, Matthew Craig, Jens Frank
Daniel Pondella
Partial sequences of 16S and 12S mitochondrial ribosomal DNA were used to examine the phylogenetic relationships of the primarily eastern Pacific genus Paralabrax (Perciformes: Serranidae) and allied taxa. Paralabrax is considered a basal serranine, which is itself considered the basal subfamily in the Serranidae. Multiple serranines reported closely related to Paralabrax from the genera Serranus, Hypoplectrus, Cratinus, and Centropristis were used as outgroups. Species from the remaining two subfamilies, Epinephilinae and Anthiinae, of the Serranidae were also used in the analyses. The tree of the Serranidae was rooted with the families Polyprionidae and Priacanthidae. Paralabrax, the Serranidae, and the Serraninae …
Cosmopolitan Cyanobacteria, Paula Furey
N-Acetyl-D-Glucosamine In Crustacean Hemocytes; Possible Functions And Usefulness In Hemocyte Classification., Gary G. Martin, Catherine Castro, Nicholas Moy, Nicole Rubin
N-Acetyl-D-Glucosamine In Crustacean Hemocytes; Possible Functions And Usefulness In Hemocyte Classification., Gary G. Martin, Catherine Castro, Nicholas Moy, Nicole Rubin
Gary Martin
The lectin wheat-germ agglutinin (WGA) selectively binds N-acetyl-D-glucosamine. Fluorescence and electron microscopy were used to show that WGA stains the cytoplasmic granules in the granulocytes, but not the hyaline cells, of two decapods, the ridgeback prawn Sicyonia ingentis and the American lobster Homarus americanus. Using fluorescence microscopy, two intermediate stages in granulocyte maturation were observed. Cells smaller than typical small-granule hemocytes were observed with 5 or fewer granules, which in previous studies using brightfield and phase optics were probably counted as hyaline cells. Also, some granulocytes were observed containing both small and large granules, supporting the suggestion that small and …
Metabolic Responses Of Shorebird Chicks To Cold Stress: Hysteresis Of Cooling And Warming Phases, Robert E. Ricklefs, Joseph B. Williams
Metabolic Responses Of Shorebird Chicks To Cold Stress: Hysteresis Of Cooling And Warming Phases, Robert E. Ricklefs, Joseph B. Williams
Robert Ricklefs
Maturation Of Cardiovascular Control Mechanisms In The Embryonic Emu (Dromiceius Novaehollandiae), Dane Crossley, Brian Bagatto, Edward Dzialowski, Warren Burggren
Maturation Of Cardiovascular Control Mechanisms In The Embryonic Emu (Dromiceius Novaehollandiae), Dane Crossley, Brian Bagatto, Edward Dzialowski, Warren Burggren
Brian P. Bagatto
Our understanding of avian embryonic cardiovascular regulation has been based on studies in chickens. The present study was undertaken to determine if the patterns established in chickens are generally applicable to the emu, a ratite bird species. We studied cardiovascular physiology over the interval from 60% to 90% of the emu's 50-day incubation period. During this period, embryonic emus exhibit a slight fall in resting heart rate (from 171 beats min(-1) to 154 beats min(-1)) and a doubling of mean arterial pressure (from 1.2 kPa to 2.6 kPa). Exposures to 15% or 10% O(2) initially decreased heart rate during the …
A Model For Shear Stress Sensing And Transmission In Vascular Endothelial Cells, Borbala Mazzag, John S. Tamaresis, Abdul Barakat
A Model For Shear Stress Sensing And Transmission In Vascular Endothelial Cells, Borbala Mazzag, John S. Tamaresis, Abdul Barakat
Borbala Mazzag
Lack Of Widespread Organochlorine Pesticide Contamination In South American Resident Passerines, Given Harper, A. P. Capparella, J. A. Klemens, J. A. Frick
Lack Of Widespread Organochlorine Pesticide Contamination In South American Resident Passerines, Given Harper, A. P. Capparella, J. A. Klemens, J. A. Frick
Given Harper
Sequential Radiation Of Unrelated Organisms: The Gall Fly Eurosta Solidaginis And The Tumbling Flower Beetle Mordellistena Convicta, Warren Abrahamson, C.P. Blair, M.D. Eubanks, S.A. Morehead
Sequential Radiation Of Unrelated Organisms: The Gall Fly Eurosta Solidaginis And The Tumbling Flower Beetle Mordellistena Convicta, Warren Abrahamson, C.P. Blair, M.D. Eubanks, S.A. Morehead
Warren G. Abrahamson, II
No abstract provided.
Developmental Constraint In Spermtail Evolution, Mark Nielsen
Developmental Constraint In Spermtail Evolution, Mark Nielsen
Mark G. Nielsen
Nielsen, M. G. (Principal), "Developmental Constraint in Spermtail Evolution," National Science Foundation MCB-0316359, $170,000.00 (2003 - 2007). We determined that the mode and tempo of insect tubulin evolution is dictated by the rate of production of heritable variants, not competition among tubulin alleles.
Cynipid Gall-Wasp Communities Correlate With Oak Chemistry, Warren Abrahamson, M.D. Hunter, G. Melika, P.W. Price
Cynipid Gall-Wasp Communities Correlate With Oak Chemistry, Warren Abrahamson, M.D. Hunter, G. Melika, P.W. Price
Warren G. Abrahamson, II
No abstract provided.
One Host Shift Leads To Another? Evidence Of Host-Race Formation In A Predaceous Gall-Boring Beetle, Warren Abrahamson, M.D. Eubanks, C.P. Blair
One Host Shift Leads To Another? Evidence Of Host-Race Formation In A Predaceous Gall-Boring Beetle, Warren Abrahamson, M.D. Eubanks, C.P. Blair
Warren G. Abrahamson, II
No abstract provided.
Determination Of The Efficacy Of The Antigen Extraction Technique In The Pathfinder-Eia Chlamydia Detection System, George A. Ndeta, Broderick Eribo, James Gregory
Determination Of The Efficacy Of The Antigen Extraction Technique In The Pathfinder-Eia Chlamydia Detection System, George A. Ndeta, Broderick Eribo, James Gregory
Broderick Eribo
Identification Of Asteroid Genera With Species Capable Of Larval Cloning, K. E. Knott, E. J. Balser, William Jaeckle
Identification Of Asteroid Genera With Species Capable Of Larval Cloning, K. E. Knott, E. J. Balser, William Jaeckle
William Jaeckle
Asexual reproduction in larvae, larval cloning, is a recently recognized component of the complex life histories of asteroids. We compare DNA sequences of mitochondrial tRNA genes (Ala, Leu, Asn, Pro and Gln) from larvae in the process of cloning collected in the field with sequences from adults of known species in order to identify asteroid taxa capable of cloning. Neighbor-joining analysis identified four distinct groups of larvae, each having no, or very little, sequence divergence (p distances ranging from 0.00000 to 0.02589); thus, we conclude that each larval group most likely represents a single species. These field-collected larvae cannot be …
Long-Term Patterns Of Acorn Production For Five Oak Species In Xeric Florida Uplands, Warren G. Abrahamson Ii, J.N. Layne
Long-Term Patterns Of Acorn Production For Five Oak Species In Xeric Florida Uplands, Warren G. Abrahamson Ii, J.N. Layne
Warren G. Abrahamson, II
No abstract provided.
Forest Composition, Spatial Pattern, And Size Structure Of The Snyder-Middleswarth Natural Area Old-Growth, Snyder County, Pennsylvania, P.P. Zawadzkas, Warren G. Abrahamson Ii
Forest Composition, Spatial Pattern, And Size Structure Of The Snyder-Middleswarth Natural Area Old-Growth, Snyder County, Pennsylvania, P.P. Zawadzkas, Warren G. Abrahamson Ii
Warren G. Abrahamson, II
No abstract provided.
The Problem With The Paleoptera Problem: Sense And Sensitivity, T. Heath Ogden
The Problem With The Paleoptera Problem: Sense And Sensitivity, T. Heath Ogden
T. Heath Ogden
While the monophyly of winged insects (Pterygota) is well supported, phylogenetic relationships among the most basal extant pterygote lineages are problematic. Ephemeroptera (mayflies) and Odonata (dragonflies) represent the two most basal extant lineages of winged insects, and determining their relationship with regard to Neoptera (remaining winged insects) is a critical step toward understanding insect diversification. A recent molecular analysis concluded that Paleoptera (Odonata +Ephemeroptera) is monophyletic. However, we demonstrate that this result is supported only under a narrow range of alignment parameters. We have further tested the monophyly of Paleoptera using additional sequence data from 18SrDNA, 28S rDNA, and Histone …