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1

Digitale Medien

Clemmensen reduction of benzoylferrocene (1967)

Rausch, Marvin D. ; Adams, D. L.

s.l. : American Chemical Society

The @journal of organic chemistry 32 (1967), S. 4144-4145

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ISSN: 1520-6904

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/jo01287a122

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2

Digitale Medien

A precision measurement of the mass of the top quark (2004)

Abazov, V. M. ; Abbott, B. ; Abdesselam, A. ; [weitere]

[s.l.] : Macmillian Magazines Ltd.

Nature 429 (2004), S. 638-642

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The standard model of particle physics contains parameters—such as particle masses—whose origins are still unknown and which cannot be predicted, but whose values are constrained through their interactions. In particular, the masses of the top quark (Mt) and W boson ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/nature02589

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3

Digitale Medien

Large-x F spin asymmetry inπ 0 production by 200-GeV polarized protons (1992)

Adams, D. L. ; Akchurin, N. ; Belikov, N. I. ; [weitere]

Springer

The European physical journal 56 (1992), S. 181-184

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The spin asymmetryA N for inclusive π0 production by 200-GeV transversely-polarized protons on a liquid hydrogen target has been measured at Fermilab over a wide range ofx F, with 0.5〈p T〈2 GeV/c. Atx F〉0.3, the asymmetry rises with increasingx F and reaches a value ofA N=0.15±0.03 in the region 0.6〈x F〈0.8. This result provides new input regarding the question of the internal spin structure of transversely-polarized protons.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01555512

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4

Digitale Medien

New phenomena in the adsorption of alkali metals on Al surfaces (1996)

Adams, D. L.

Springer

Applied physics 62 (1996), S. 123-142

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ISSN: 1432-0630

Schlagwort(e): PACS: 68.35.Bs; 61.14.Hg; 68.35.Md

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract. Recent studies of the adsorption and co-adsorption of alkali metals on Al surfaces have revealed a wealth of hitherto unexpected phenomena, including: order-preserving phase transformations between metastable and stable structures; reconstruction of the substrate by adsorption at room temperature; and formation of binary and ternary surface alloys. The results of experimental structural determinations are reviewed, with the major emphasis on Low-Energy Electron Diffraction (LEED) studies of the ordered structures formed by adsorption of the alkalis on Al(1 1 1). The experimental results are compared where possible with corresponding results of ab initio calculations of total energy by Scheffler and co-workers. The experiment–theory comparisons provide valuable insight into the adsorption mechanisms, including the possible role of surface steps as both sources and sinks.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01575710

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5

Digitale Medien

New phenomena in the adsorption of alkali metals on Al surfaces (1996)

Adams, D. L.

Springer

Applied physics 62 (1996), S. 123-142

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ISSN: 1432-0630

Schlagwort(e): 68.35.13s ; 61.14.Hg ; 68.35.Md

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Recent studies of the adsorption and co-adsorption of alkali metals on Al surfaces have revealed a wealth of hitherto unexpected phenomena, including: order-preserving phase transformations between metastable and stable structures; reconstruction of the substrate by adsorption at room temperature; and formation of binary and ternary surface alloys. The results of experimental structural determinations are reviewed, with the major emphasis on Low-Energy Electron Diffraction (LEED) studies of the ordered structures formed by adsorption of the alkalis on Al(111). The experimental results are compared where possible with corresponding results of ab initio calculations of total energy by Scheffler and co-workers. The experiment-theory comparisons provide valuable insight into the adsorption mechanisms, including the possible role of surface steps as both sources and sinks.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01575710

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6

Digitale Medien

Postmetaphase nuclear formation: loss of a chromosomal epitope coincident with apparent chromatid coalescence (1996)

Adams, D. L. ; Hodge, L. D.

Springer

Chromosoma 105 (1996), S. 31-40

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ISSN: 1432-0886

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin

Notizen: Abstract. Previously, we have conceptualized mitotic nuclear formation following metaphase as a morphogenic process and have suggested that sets of chromatids, after separation from a metaphase plate, can be thought of as prenuclei. Such structures can be grouped temporally as either early or late prenuclei based on morphologic, morphometric and density characteristics. Sequential ordering of early prenuclei is of particular interest because it reveals that condensed chromatids coalesce with the resulting formation of a unique chambered structure. In this paper we describe data obtained with a newly raised monoclonal antibody (mAb-2) that initially recognizes an epitope(s) on metaphase chromosomes. Light and confocal fluorescent microscopy of early prenuclei reveal that the chromosomal epitope can no longer be detected about chromatids after their apparent coalescence. Immunoblot analysis of dispersed polypeptides of metaphase plates and early prenuclei indicates that the major protein antigens recognized by mAb-2 have apparent molecular masses of approximately 106000 and 80500 and that each is likely composed of multiple charge isomers. A dual fluorescent analysis using mAb-2 and high-titer anti-lamin B serum provides additional evidence that chromatid coalescence is a separate, early event that precedes nuclear lamina formation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s004120050156

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7

Digitale Medien

Effects of reforestation methods on genetic diversity of lodgepole pine: an assessment using microsatellite and randomly amplified polymorphic DNA markers (1999)

Thomas, B. R. ; Macdonald, S. E. ; Hicks, M. ; [weitere]

Springer

Theoretical and applied genetics 98 (1999), S. 793-801

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ISSN: 1432-2242

Schlagwort(e): Key words Pinus contorta ; Silviculture ; Reforestation ; Gene conservation ; RAPD ; SSR ; DNA analyses

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract We examined the effects of different methods of forest regeneration on the genetic diversity of lodgepole pine (Pinus contorta var ‘latifolia’) using two different DNA-based molecular markers [randomly amplified polymorphic DNA (RAPDs) and microsatellites or simple sequence repeats (SSRs)]. Genetic diversity was estimated for 30 individuals in each of four populations for the following three stand types: (1) mature lodgepole pine (〉100 years); (2) 20- to 30-year-old harvested stands left for natural regeneration; (3) 20- to 30-year-old planted stands (4 stands of each type); and one group of 30 operationally produced seedlings. There was no significant effect of stand type on expected heterozygosity, although allelic richness and diversity were much higher for SSRs than for RAPDs. Expected heterozygosity ranged from 0.39 to 0.47 based on RAPDs and from 0.67 to 0.77 based on SSRs. The number of alleles per locus for SSRs ranged from 3 to 34 (mean 21.0), and there was a significant relationship between sequence repeat length and the number of alleles at a locus. Both marker types showed that over 94% of the variation was contained within the populations and that the naturally regenerated stands sampled had lower (not significant) expected heterozygosity than the planted or unharvested stands. The group of seedlings (assessed by RAPDs only) had expected heterozygosity and allele frequencies similar to those of the unharvested stands. Genetic distance measures were higher than obtained previously in the species using isozyme markers. There was no correlation between the two marker types for pair-wise genetic distances based on populations analyzed by both methods. Pair-wise genetic distance measures and an ordination of allele frequencies for both marker types showed little effect of geographic location or stand type on genetic similarity.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s001220051136

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