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Articles 391 - 396 of 396
Full-Text Articles in Biology
Isolation And Distribution Of A Drosophila Protein Preferentially Associated With Inactive Regions Of The Genome, G Fleischmann, R Filipski, Sarah C.R. Elgin
Isolation And Distribution Of A Drosophila Protein Preferentially Associated With Inactive Regions Of The Genome, G Fleischmann, R Filipski, Sarah C.R. Elgin
Biology Faculty Research
The distribution patterns of chromosomal proteins from Drosophila can be observed by immunofluorescent staining of the polytene chromosomes from larval salivary glands. We have purified a non-histone chromosomal protein of Mr = 69,000 molecular weight which has a high affinity for DNA with little sequence specificity. Immunofluorescent staining indicates that this protein is preferentially associated with the inactive portions of the genome, including the centric heterochromatin and the condensed bands within the euchromatic arms of the chromosomes. Observation of both the heat shock loci 87A and 87C and the developmentally regulated loci 74EF and 75B shows an inverse correlation between …
Characterization Of A Supercoil-Dependent S1 Sensitive Site 5' To The Drosophila Melanogaster Hsp 26 Gene, Ester Siegfried, Graham H. Thomas, U Bond, Sarah C.R. Elgin
Characterization Of A Supercoil-Dependent S1 Sensitive Site 5' To The Drosophila Melanogaster Hsp 26 Gene, Ester Siegfried, Graham H. Thomas, U Bond, Sarah C.R. Elgin
Biology Faculty Research
We have analyzed the prominent supercoil-dependent S1 nuclease cleavage site 5' to hsp 26 in the plasmid 88B13, which contains 11.7 kilobases from the Drosophila locus 67B1. The double stranded cleavage product is generated by initial nicking on the purine strand, six preferred sites occurring between positions -96 and -90 (relative to the start of transcription) with weaker ones extending to position -84, followed by cleavage on the pyrimidine strand at positions -86 and -84. A derivative of 88B13, 88B13-X, was generated by insertion of an Xho I linker at position -84; this does not affect the positions or strand …
Multiple Mating, Sperm Competition And The Fertility Component Of Fitness In Drosophila-Pseudoobscura, Monte E. Turner
Multiple Mating, Sperm Competition And The Fertility Component Of Fitness In Drosophila-Pseudoobscura, Monte E. Turner
Biology Faculty Research
Those aspects of an organism's biology that influence the number of progeny produced make up the fertility component of its fitness. The fertility of both male and female Drosophila pseudoobscura is influenced by multiple matings. In the former, rates of multiple matings and the genotypes of females' other mates interact to affect male fitness. Female fecundity and productivity increases with multiple matings, while longevity declines. Mating rates could be the result of these conflicting selection pressures. Density is a non-genetic factor influencing multiple mating. The mechanisms by which multiple matings increase female fertility is not the same in different species …
The Eugenics Record Office At Cold Spring Harbor, 1910-1940: An Essay In Institutional History, Garland E. Allen
The Eugenics Record Office At Cold Spring Harbor, 1910-1940: An Essay In Institutional History, Garland E. Allen
Biology Faculty Research
No abstract provided.
Relative Intestine Length And Feeding Ecology Of Freshwater Fishes, David O. Ribble, M H. Smith
Relative Intestine Length And Feeding Ecology Of Freshwater Fishes, David O. Ribble, M H. Smith
Biology Faculty Research
There is a significant relationship between the intestine length (Y) and total body length (X) for 11 species of freshwater fish (Y = 0.08X1.42). Sufficient variation exists about this relationship to indicate important differences among the species' diets. The diets for each species, ranked on a Trophic Index scale determined from literature data, are negatively rank order correlated with the mean relative intestine lengths (rs = -0.67). There is no significant rank order correlation between the Trophic Indices determined from data on stomach contents and the mean relative intestine lengths for fish from a single creek.
[Book Review Of] Adaptation In Metapopulations: How Interaction Changes Evolution, By Michael J. Wade., David C. Queller
[Book Review Of] Adaptation In Metapopulations: How Interaction Changes Evolution, By Michael J. Wade., David C. Queller
Biology Faculty Research
Adaptation in Metapopulations: How Interaction Changes Evolution. By Michael J. Wade. Chicago (Illinois): University of Chicago Press . $120.00 (hardcover); $40.00 (paper). vii + 260 p.; ill.; index. ISBN: 978-0-226-12956-3 (hc); 978-0-226-12973-0 (pb); 978-0-226-12987-7 (eb). 2016.