156 results match your criteria: "Museum Support Center[Affiliation]"

Mice of the Peromyscus aztecus species group occur at mid to high elevations in several mountain ranges in the highlands of Middle America (Mexico and Central America), a region of high endemicity. We examined the biogeography of this group by conducting phylogenetic analyses of 668 bp of the mitochondrial cytochrome b (cyt b) gene. Phylogenetic analyses under both parsimony and likelihood frameworks produced the same topologies, but estimates of nodal support were artificially high in weighted parsimony analyses.

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Early pleistocene habitat in member 1 Olorgesailie based on paleosol stable isotopes.

J Hum Evol

November 1999

Smithson Light Isotope Laboratory, Museum Support Center, Smithsonian Institution, Washington, DC 20560-0534, USA.

Stable carbon and oxygen isotope values from soil carbonates were used to determine the vegetation context of archaeological sites and local climatic conditions represented in a approximately 0.99 Ma paleosol that is exposed laterally in the Olorgesailie basin, southern Kenya rift valley. As part of this landscape-scale project, samples of an upper Member 1 paleosol were analyzed along nearly 4 km of outcrop in three adjacent parts of the basin.

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Aedes (Finlaya) japonicus japonicus (Theobald), a new introduction into the United States.

J Am Mosq Control Assoc

June 1999

Walter Reed Biosystematics Unit, Museum Support Center, Smithsonian Institution, Washington, DC 20560, USA.

Aedes (Finlaya) japonicus japonicus is recorded for the 1st time in the United States. Four adult females were collected in light traps at 2 sites in New York and one site in New Jersey during the months of August and September 1998. Notes on bionomics are provided.

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Variation in the pattern of nucleotide substitution across sites.

J Mol Evol

January 1999

Laboratory of Molecular Systematics, Smithsonian Museum Support Center, 4210 Silver Hill Road, Suitland, MD 20746, USA.

A model of nucleotide substitution that allows the transition/transversion rate bias to vary across sites was constructed. We examined the fit of this model using likelihood-ratio tests by analyzing 13 protein coding genes and 1 pseudogene. Likelihood-ratio testing indicated that a model that allows variation in the transition/transversion rate bias across sites provided a significant improvement in fit for most protein coding genes but not for the pseudogene.

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