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Articles 931 - 934 of 934
Full-Text Articles in Life Sciences
Sunbathing Vermilion-Crowned Flycatchers Repulse Mates, Lawrence Kilham
Sunbathing Vermilion-Crowned Flycatchers Repulse Mates, Lawrence Kilham
Dartmouth Scholarship
Vermilion-crowned Flycatchers (Myiozetetes similis, formerly called Social Flycatchers) remain paired the year around (Skutch 1960). I was watching the members of a pair foraging in close association along the bank of a pond (near Escuintla in the Pacific lowlands of Guatemala) on 29 December 1976, when the two came to a patch of relatively bare earth 1-2 m in extent. This was late in the morning of a hot, sunny day. One of them immediately sprawled belly to the earth, with wings and tail widely spread and head back in the sunbathing posture of a passerine (Hauser 1957). When the …
The Isolation Of Ecdysterone Inducible Genes By Hybridization Subtraction Chromatography, Michael P. Vitek, Susan G. Kreissman, Robert H. Gross
The Isolation Of Ecdysterone Inducible Genes By Hybridization Subtraction Chromatography, Michael P. Vitek, Susan G. Kreissman, Robert H. Gross
Dartmouth Scholarship
We have developed a procedure for selectively enriching a mRNA population for inducible sequences. Other than the induced mRNA species, the population of mRNA in control cells is approximately the same as the mRNA population in induced cells. Cytoplasmic mRNA from control cells is bound to oligo (dT)-cellulose and used as a template for reverse transcriptase, the oligo (dT) serving as a primer. After removing the template mRNAs, the cDNA-cellulose column is used to hybridize a population of mRNAs from induced cells. The non-hybridized poly A + RNAs are greatly enriched in the inducible sequences. We have used this technique …
Functional Relationship Between Parts Of The Replication Region Of Plasmid Cole1., Joseph Inselburg
Functional Relationship Between Parts Of The Replication Region Of Plasmid Cole1., Joseph Inselburg
Dartmouth Scholarship
The inhibition of plasmid ColE1 replication caused by a deletion of the ColE1 plasmid replication origin has been previously reported (T. Hashimoto-Gotoh and J. Inselburg, J. Bacteriol. 139:597-619). Evidence is presented showing that restoration of the deleted nucleotide sequence in the precise relationship it normally has to the rest of the replication region is essential for restoration of ColE1 replication capability to the deletion mutant.
The United Nations Environment Programme, Norman Miller
The United Nations Environment Programme, Norman Miller
Dartmouth Scholarship
It was once described as a part of the "quiet side" of the United Nations family, one of those organizations that did good works but rarely made headlines. Times have changed. Today the United Nations Environment Programme (UNEP), headquartered in Nairobi, Kenya, has come into prominence, not because of UN cliches about "spaceship earth," but because a great many ordinary people have come to realize they could be physically harmed by environmental hazards. The common man" in industrial states has begun to worry about the environment in respect to his health and the health of his children. He is asking …