Biology Commons^™

Genetic Control Of Murine Igd Structural Heterogeneity, Roberta R. Pollock, Martin E. Dorf, Matthew F. Mescher

Roberta Pollock

Murine B lymphocytes express two native forms of surface IgD: IgDI consists of two delta heavy chains and two light chains; IgDII consists of one heavy chain and one light chain. The relative amounts of IgDI and IgDII present on spleen cells were found to vary significantly among different strains of mice. Genetic evidence demonstrated that the IgDI/IgDII ratio is linked to the Igh-5 allotype. (The delta heavy chain is the product of the Igh-5 locus). Mice bearing the Igh-5e allotype have a low ratio, and mice bearing the Igh-5a or Igh-5b allotype have a high ratio. The Igh-5 locus …

Comparison Of Carbon And Nitrogen Content Of Infected And Uninfected Snails, Succinea Ovalis, And The Trematode Leucochloridium Variae, A Burky, Daniel J. Hornbach

Daniel J. Hornbach

No abstract provided.

Immunobiology Of Malaria, Clarence Lee, Yvonne Hogan, Georgiana Aboko-Cole

Clarence Lee

Germination Of Cow Parsnip Seeds From Grizzly Bear Feces, James M. Novak, Roger D. Applegate, Lynn L. Rogers, David A. Casteel

James M. Novak

No abstract provided.

Nest Desertion By The Pinyon Jay, Larry Clark

Larry Clark

No abstract provided.

Rna Sequencing Provides Evidence For Allelism Of Determinants Of The N-, B-, Or Nb- Tropism Of Murine Leukemia Viruses, Jean Rommelaere, Helen Donis-Keller, Nancy Hopkins

Helen Donis-Keller

Previous genetic and biochemical studies identified three large RNAase T1-resistant oligonucleotides, each associated with either the N-, B- or NB-tropism of murine C-type viruses of BALB/c origin. These oligonucleotides were shown to lie in the 5′ third of the oligonucleotide maps of their respective viruses. We sequenced the three oligonucleotides and found that they share a 10 base sequence. Together these observations provide good evidence that the determinants of N-, B- or NB-tropism monitored by the three oligonucleotides are allelic.The oligonucleotides associated with N- and B-tropism differ in sequence at four of sixteen nucleotides, while the B- and NB-tropism-associated oligonucleotides …

Notes On The Flora Of Rhode Island, Gordon C. Tucker

Gordon C. Tucker

No abstract provided.

Distribution And Relative Abundance Of Small Mammals In The Illini Forest Plantation, Urbana, Illinois, James M. Novak

James M. Novak

The abundance and distribution of small mammals were analyzed for correlation with the vegetational characteris· tics of their habitat. Positive correlations were found for the number of mammals trapped per area trapped versus the total ground cover (r= .67, P< .05) and for the number of mammal species versus total ground cover (r= .73, P<.05). The habitat preferences of the three species trapped (short-tailed shrews B/,arina brevicauda. white-footed mice Peromyscus leucopuus, and meadow voles Microtus pennsylvanicus) showed a distinct distributional pattern for the species in relation to their habitats. The management of forest-tree plantations to achieve high densities during the seedling stage and the use of silvicultural practices that promote high shrub densities are suggested as inexpensive and natural control measures for injurious microtine rodents. Seedlings must be permitted to reach a sufficient height to remove the risk of the shrubs overtopping them.

Mapping Adenines, Guanines, And Pyrimidines In Rna, Helen Donis-Keller, Allan Maxam, Walter Gilbert

Helen Donis-Keller

The positions of adenines, guanines, and pyrimidines can be determined by partial nuclease digestion of a terminally labeled RNA molecule. In urea, at elevated temperatures, RNase T1 generates a pattern reflecting cleavage at guanines while RNase U2 cleaves only at adenine. A limited alkaline hydrolysis provides a continuum of fragments derived from breaks at every phosphodiester bond. The reaction products are electrophoretically fractionated by size in adjacent lanes of a polyacrylamide gel. An autoradiograph of the gel displays the sequence up to 100 nucleotides from the end of the molecule, although uracil cannot as yet be distinguished from cytosine. These …

Algae-Grazer Interactions, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Solidago Canadensis Galls: A Study Of Interacting Natural Populations, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Niche Analysis Of Marine Algae, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

The Effects Of Grazing On Vegetation, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Growth Forms Of Opuntia Compressa (Cactaceae) In Florida Sandridge Habitats, Warren Abrahamson, J. Rubinstein

Warren G. Abrahamson, II

No abstract provided.

Reproductive Strategies Of Dewberries, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Reproduction Of Rubus Hispidus L. In Different Habitats, Warren Abrahamson

Warren G. Abrahamson, II

No abstract provided.

Growth Form And Reproductive Effort In Goldenrods, Warren Abrahamson, M. Gadgil

Warren G. Abrahamson, II

No abstract provided.

Logical And Persuasive Structures In Charles Darwin's Prose Style, Charles Kay Smith

Charles Kay Smith

This paper analyzes Charles Darwin's characteristic writing behavior. Darwin was a more interesting and dedicated writer than he is commonly credited for being. This essay will reassess the importance of his writing. The surface characteristics of Darwin's prose (conventionally referred to as his "style") seem at first glance so plain and ordinary that Darwin's writing rarely interests students of style. Exceptions such as Theodore Baird in an essay entitled "Darwin and the Tangled Bank"1 and Stanley Edgar Hyman in a longer study of Darwin's writing, The Tangled Bank,2 both make a point of the current general disregard of Darwin as …

Predicting Bite Force In Mammals: 2d Vs. 3d Lever Models, Elizabeth R. Dumont

Elizabeth R. Dumont

Bite force is a measure of whole-organism performance that is often used to investigate the relationships between performance, morphology and fitness. When in vivo measurements of bite force are unavailable, researchers often turn to lever models to predict bite forces. This study demonstrates that bite force predictions based on two-dimensional (2-D) lever models can be improved by including three-dimensional (3-D) geometry and realistic physiological cross-sectional areas derived from dissections. Widely used, the 2-D method does a reasonable job of predicting bite force. However, it does so by over predicting physiological cross-sectional areas for the masseter and pterygoid muscles and under …