Search Results - (Author, Cooperation:D. Larson)
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1Latest Papers from Table of Contents or Articles in PressB. M. Jakosky ; J. M. Grebowsky ; J. G. Luhmann ; J. Connerney ; F. Eparvier ; R. Ergun ; J. Halekas ; D. Larson ; P. Mahaffy ; J. McFadden ; D. F. Mitchell ; N. Schneider ; R. Zurek ; S. Bougher ; D. Brain ; Y. J. Ma ; C. Mazelle ; L. Andersson ; D. Andrews ; D. Baird ; D. Baker ; J. M. Bell ; M. Benna ; M. Chaffin ; P. Chamberlin ; Y. Y. Chaufray ; J. Clarke ; G. Collinson ; M. Combi ; F. Crary ; T. Cravens ; M. Crismani ; S. Curry ; D. Curtis ; J. Deighan ; G. Delory ; R. Dewey ; G. DiBraccio ; C. Dong ; Y. Dong ; P. Dunn ; M. Elrod ; S. England ; A. Eriksson ; J. Espley ; S. Evans ; X. Fang ; M. Fillingim ; K. Fortier ; C. M. Fowler ; J. Fox ; H. Groller ; S. Guzewich ; T. Hara ; Y. Harada ; G. Holsclaw ; S. K. Jain ; R. Jolitz ; F. Leblanc ; C. O. Lee ; Y. Lee ; F. Lefevre ; R. Lillis ; R. Livi ; D. Lo ; M. Mayyasi ; W. McClintock ; T. McEnulty ; R. Modolo ; F. Montmessin ; M. Morooka ; A. Nagy ; K. Olsen ; W. Peterson ; A. Rahmati ; S. Ruhunusiri ; C. T. Russell ; S. Sakai ; J. A. Sauvaud ; K. Seki ; M. Steckiewicz ; M. Stevens ; A. I. Stewart ; A. Stiepen ; S. Stone ; V. Tenishev ; E. Thiemann ; R. Tolson ; D. Toublanc ; M. Vogt ; T. Weber ; P. Withers ; T. Woods ; R. Yelle
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-11-07Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressS. Bougher ; B. Jakosky ; J. Halekas ; J. Grebowsky ; J. Luhmann ; P. Mahaffy ; J. Connerney ; F. Eparvier ; R. Ergun ; D. Larson ; J. McFadden ; D. Mitchell ; N. Schneider ; R. Zurek ; C. Mazelle ; L. Andersson ; D. Andrews ; D. Baird ; D. N. Baker ; J. M. Bell ; M. Benna ; D. Brain ; M. Chaffin ; P. Chamberlin ; J. Y. Chaufray ; J. Clarke ; G. Collinson ; M. Combi ; F. Crary ; T. Cravens ; M. Crismani ; S. Curry ; D. Curtis ; J. Deighan ; G. Delory ; R. Dewey ; G. DiBraccio ; C. Dong ; Y. Dong ; P. Dunn ; M. Elrod ; S. England ; A. Eriksson ; J. Espley ; S. Evans ; X. Fang ; M. Fillingim ; K. Fortier ; C. M. Fowler ; J. Fox ; H. Groller ; S. Guzewich ; T. Hara ; Y. Harada ; G. Holsclaw ; S. K. Jain ; R. Jolitz ; F. Leblanc ; C. O. Lee ; Y. Lee ; F. Lefevre ; R. Lillis ; R. Livi ; D. Lo ; Y. Ma ; M. Mayyasi ; W. McClintock ; T. McEnulty ; R. Modolo ; F. Montmessin ; M. Morooka ; A. Nagy ; K. Olsen ; W. Peterson ; A. Rahmati ; S. Ruhunusiri ; C. T. Russell ; S. Sakai ; J. A. Sauvaud ; K. Seki ; M. Steckiewicz ; M. Stevens ; A. I. Stewart ; A. Stiepen ; S. Stone ; V. Tenishev ; E. Thiemann ; R. Tolson ; D. Toublanc ; M. Vogt ; T. Weber ; P. Withers ; T. Woods ; R. Yelle
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-11-07Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Latest Papers from Table of Contents or Articles in PressN. M. Schneider ; J. I. Deighan ; S. K. Jain ; A. Stiepen ; A. I. Stewart ; D. Larson ; D. L. Mitchell ; C. Mazelle ; C. O. Lee ; R. J. Lillis ; J. S. Evans ; D. Brain ; M. H. Stevens ; W. E. McClintock ; M. S. Chaffin ; M. Crismani ; G. M. Holsclaw ; F. Lefevre ; D. Y. Lo ; J. T. Clarke ; F. Montmessin ; B. M. Jakosky
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-11-07Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Latest Papers from Table of Contents or Articles in PressS. Ghosh ; S. D. Larson ; H. Hefzi ; Z. Marnoy ; T. Cutforth ; K. Dokka ; K. K. Baldwin
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-04-01Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; *Brain Mapping ; Female ; Male ; Mice ; Neuroanatomical Tract-Tracing Techniques ; Odors/analysis ; Olfactory Bulb/anatomy & histology/cytology/physiology ; Olfactory Pathways/anatomy & histology/*cytology/*physiology ; Olfactory Perception/*physiology ; Olfactory Receptor Neurons/*cytology/*physiology ; Sindbis Virus/genetics/physiology ; Smell/physiologyPublished by: -
5Articles: DFG German National LicensesChambers, G. K. ; Felton, A. A. ; Ramshaw, J. A. M. ; Rigby, D. Larson ; Sullivan, D. T.
Springer
Published 1985Staff ViewISSN: 1573-4927Keywords: Drosophila melanogaster ; D. hydei ; D. immigrans ; D. mercatorum ; glycerol-3-phosphate dehydrogenase ; peptide mapping ; amino acid sequencingSource: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNotes: Abstract This report describes preliminary protein structural studies of glycerol-3-phosphate dehydrogenase (α-GPDH) fromDrosophila spp. and an important innovative feature of our enzyme purification protocol. The scheme involves the coupling of substrate (α-glycerophosphate) elution from CM-Sephadex and cofactor (NADH) elution from Affi-Gel blue resin. Using this method a 32.7% yield and a 111-fold purification were obtained from aD. melanogaster line carrying the α-Gpdh S allele at the α-Gpdh locus. The product obtained from 0 to 3-day-old adult flies was electrophoretically homogeneous and consisted mainly of the adult α-GPDH-1 isozyme. The method was used to obtain α-GPDH protein fromD. melanogaster (two lines),D. hydei, D. immigrans, andD. mercatorum. Peptide mapping revealed structural differences among the enzymes from the different species, and amino acid sequencing showed many similarities betweenD. melanogaster α-GPDH and the rabbit muscle enzyme.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesChambers, G. K. ; Felton, A. A. ; Ramshaw, J. A. M. ; Rigby, D. Larson ; Sullivan, D. T.
Springer
Published 1985Staff ViewISSN: 1573-4927Keywords: Drosophila melanogaster ; D. hydei ; D. immigrans ; D. mercatorum ; glycerol-3-phosphate dehydrogenase ; peptide mapping ; amino acid sequencingSource: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNotes: Abstract This report describes preliminary protein structural studies of glycerol-3-phosphate dehydrogenase (α-GPDH) fromDrosophila spp. and an important innovative feature of our enzyme purification protocol. The scheme involves the coupling of substrate (α-glycerophosphate) elution from CM-Sephadex and cofactor (NADH) elution from Affi-Gel blue resin. Using this method a 32.7% yield and a 111-fold purification were obtained from aD. melanogaster line carrying the α-Gpdh S allele at the α-Gpdh locus. The product obtained from 0 to 3-day-old adult flies was electrophoretically homogeneous and consisted mainly of the adult α-GPDH-1 isozyme. The method was used to obtain α-GPDH protein fromD. melanogaster (two lines),D. hydei, D. immigrans, andD. mercatorum. Peptide mapping revealed structural differences among the enzymes from the different species, and amino acid sequencing showed many similarities betweenD. melanogaster α-GPDH and the rabbit muscle enzyme.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Three-dimensional atom probe analyses of the interfaces between CoFe and Cu layers has shown that both roughness and chemical intermixing can occur independently. Interfaces formed by the deposition of Cu onto CoFe mimic the roughness present in previously deposited interfaces, but have a very small amount of interfacial mixing. In contrast, interfaces formed by the deposition of CoFe onto Cu are less rough, but more chemically intermixed. The region of chemical intermixing formed when CoFe is deposited onto Cu (0.7–1.0 nm) is approximately two times larger than that when Cu is deposited onto CoFe (0.3–0.5 nm). © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesGibson, N. D. ; Davies, B. J. ; Larson, D. J.
College Park, Md. : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: The electron affinity of platinum has been measured to be 17 125(9) cm−1. A pulsed dye laser beam perpendicular to an ion beam photodetached the Pt−. The relative cross section near threshold was measured by detecting the fast neutrals. The threshold was determined by fitting the cross section to the Wigner law.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1526-100XSource: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyNotes: Abstract Restoration of degraded natural vegetation in parks is often complicated by the need to maintain public access. We tested whether the natural canopy species, Thuja occidentalis, can be restored to degraded cliff edges in Bruce Peninsula National Park, Ontario, Canada without reductions in visitor numbers. Eighty 10-year-old and 80 4-year-old container-grown saplings and 1,400 seeds were planted and monitored for 4 years. Eight treatments were applied that tested for effects of planting site (distance from cliff edge and pathways) and supportive measures (soil, water, cages, or signs) on survival, growth, and damage. No trees became successfully established from seed. Younger trees showed faster initial establishment and growth, but 4-year survival was the same for both age groups (39%). Supplemental soil improved the health of planted trees, and both soil and water slightly improved their survival. Cages did not affect survival and growth but decreased damage to 4-year-old trees and increased it for 10-year-olds. Signs had no effect on any measured variable. Trees planted away from the cliff edge and from pathways had the greatest establishment success, 4-year survival, and general health. Relative visitor density, as estimated from spot counts of visitors, had the largest effect on restoration success; the results suggest a threshold of visitor density above which restoration may be impossible. Planting location, especially with respect to shade, was also important. The planting of 4-year-old trees without supportive measures is suggested as the most cost-effective restoration technique at this site. The results indicate that restoration of open woodland habitats is possible without total visitor exclusion but that some restrictions on visitor numbers or activities are necessary.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1526-100XSource: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyNotes: Few early examples of forest restoration projects are extant in the formerly forested parts of eastern North America. In this paper I present the history and status of an early forest restoration project in a denuded gravel pit in Ontario, Canada. The site was part of a deciduous forest until 1840, at which time forest clearing occurred. From 1874 to 1886 the site was exploited as a gravel pit. In 1887, under the direction of William Brown, it was planted with 14 species of coniferous and deciduous trees, of which 10 are still present. No soil preparation was carried out. The trees were pruned for 7 years, but in 1892 intensive maintenance ceased. In the 107 years since planting, the site has acquired some structural characteristics similar to the surrounding native deciduous forest, but it retains characteristics of an artificial community. Canopy cover has increased from 85% to over 95% since 1930 and is primarily Juglans nigra and Acer platan aides, Survivorship and current growth rates of native and exotic taxa have been similar. Recruitment patterns suggest that J. nigra and A. platanoides will dominate the canopy over the next century. The site is a useful example of the progress and problems created by attempts at forest restoration today.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesBlack, T. D. ; Hafiz, A. ; Larson, D. A. ; Magnusson, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1989Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Recording of low spatial frequency gratings in iron-doped LiNbO3 crystals using a single write beam by both direct contact and optical projection methods is reported. Gratings with periods in the range 50–200 μm have been produced generating up to 40 visible diffraction orders when probed with a low-power HeNe laser. Diffraction efficiencies over 20% are achieved for the first diffraction order.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Atom probe field ion microscopy has been used to analyze a planar-deposited layered structure in plan view. The specimens were prepared with a newly developed method that involves a combination of photolithography and focused ion-beam milling. A multilayer structure consisting of {Ta/CoFe/(Cu/CoFe)15/Ru/(CoFe/Ru)5/Ru/NiFe} was sputter deposited for use as a test stack. The corresponding thicknesses of these layers were 7/13(3/3)/50/(3/1)/50/150 nm. The nanometer-scale periodicity of the Cu/CoFe stack is readily apparent in transmission electron microscopy images of a field ion specimen fabricated from this material, suggesting that the specimen preparation procedure does not lead to destruction of the multilayer structure. Atom probe analysis of the bulk NiFe layer and the Ru/NiFe interface revealed the distribution of impurity atoms in the film, and these may affect the magnetic properties of the multilayers. Whereas a uniform distribution of C, N and Ar was observed, segregation of O was observed in the NiFe layer within ∼0.25 nm of the interphase interface, with a concentration greater than 20 times that found in the bulk of the NiFe layer. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesBobb, L. ; White, B. ; Tyagi, S. ; Larson, D. C.
[S.l.] : American Institute of Physics (AIP)
Published 1987Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Amorphous films 3.5 μm thick of Fe81B13.5Si3.5C2 were deposited using conventional radio-frequency sputtering on planar glass substrates and cladded single-mode optical fibers of 80-μm diameter with a core diameter of 4 μm. The substrates were arranged in two configurations. In the first configuration the substrates (group I) were placed in contact with the water-cooled substrate table; in the second configuration (group II) the substrates were suspended about 8 mm above the substrate table. Ferromagnetic resonance (FMR) and vibrating sample magnetometer (VSM) measurements were used to study the bulk properties of the film and the longitudinal magneto-optical Kerr effect was used to study the magnetic hysteresis at the film surfaces. The group (I) samples were found to be magnetically softer than their group (II) counterparts. The magnetostrictive response of the coated fibers was studied using a Mach–Zehnder interferometer. The dependence of this response on annealing is also discussed.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesLarson, D. J. ; Petford-Long, A. K. ; Cerezo, A. ; Smith, G. D. W.
Woodbury, NY : American Institute of Physics (AIP)
Published 1998Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Focused ion-beam milling has been used to fabricate field-ion specimens from a multilayer film structure containing 100 repetitions of a (Cu2 nm/Co2 nm) bilayer deposited directly onto a planar substrate. The as-deposited films showed a magnetoresistance ratio of ∼5% over a 250 Oe range at room temperature, and a coercivity of ∼60 Oe. The magnetic data suggest that the films are coupled ferromagnetically. Successful field-ion specimen preparation has allowed the observation of these layers by field-ion imaging and three-dimensional atom probe compositional analysis. Examination of the multilayer images reveals that, in some regions, the layers are nonparallel, but the interfaces are chemically quite sharp, with a diffuse interface region of ∼3 atomic layers. In addition, in some areas adjacent cobalt layers appear to be in contact. The fact that the layers are wavy suggests that the ferromagnetic coupling may be a result of Néel "orange peel" type magnetostatic coupling between adjacent cobalt layers. The relatively high coercivity may be a result of the poor layer planarity leading to a high number of domain wall pinning sites. © 1998 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesLarson, D. J. ; Clifton, P. H. ; Tabat, N.
Woodbury, NY : American Institute of Physics (AIP)
Published 2000Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Internal interfaces in metallic multilayers grown on planar silicon substrates have been chemically analyzed with atomic resolution using three-dimensional atom probe microscopy. The structure studied was a NiFe/CoFe/Cu/CoFe multilayer grown with (111) texture. Atom probe measurements across the NiFe/CoFe interfaces yield widths of 1.1±0.2 nm for NiFe grown on CoFe and 1.7±0.2 nm for CoFe grown on NiFe. The widths of interfaces between CoFe and Cu layers vary as well, with values of 0.82±0.10 nm for CoFe grown on Cu, but only 0.47±0.15 nm for Cu grown on CoFe. In addition, the Fe concentration is enriched at the interface where Cu is grown on CoFe, and depleted where CoFe is grown on Cu. These results indicate that the Fe segregates to the surface during the deposition of CoFe so that the composition at the top of this layer is Fe rich. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesSteiner, B. ; Kuriyama, M. ; Dobbyn, R. C. ; Laor, U. ; Larson, D. ; Brown, M.
[S.l.] : American Institute of Physics (AIP)
Published 1989Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Novel, streaklike disruption features restricted to the plane of diffraction have recently been observed in images obtained by synchrotron radiation diffraction from undoped, semi-insulating gallium arsenide crystals. These features were identified as ensembles of very thin platelets or interfaces lying in {110} planes, and a structural model consisting of antiphase domain boundaries was proposed. We report here the other principal features observed in high resolution monochromatic synchrotron radiation diffraction images: (quasi)cellular structure; linear, very low-angle subgrain boundaries in 〈110〉 directions, and surface stripes in a 〈110〉 direction. In addition, we report systematic differences in the acceptance angle for images involving various diffraction vectors. When these observations are considered together, a unifying picture emerges. The postulate of thin {110} antiphase boundaries leads to an understanding not only of the streak-like diffraction features but of the other principal features as well. For the formation of such regions we propose two mechanisms, operating in parallel, that appear to be consistent with the mesoscopic structure observed by a variety of techniques.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Amorphous films of Fe81B13.5Si3.5C2 were prepared by conventional diode rf sputtering with a deposition rate of about 100 A(ring)/min. The films are magnetically harder than the ribbon samples of the same composition. By appropriate magnetic annealing treatment anisotropy energy values in the range of 60–600 J/m3 have been obtained. The effect of thermal and magnetic annealing on various magnetic properties is also discussed. The relevance of the results of this study to the performance of fiber optic magnetic field sensors which utilize such magnetostrictive glasses is discussed.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesDavies, B. J. ; Ingram, C. W. ; Larson, D. J.
College Park, Md. : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: The electron affinity of iridium has been measured to be 12 613(4) cm−1. A pulsed dye laser beam perpendicular to an ion beam photodetached the negative iridium ions, and the relative cross section near threshold was measured by detecting the fast neutrals. The threshold was determined by fitting the cross section to the Wigner law. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Although there is increasing evidence of temperature acclimation of net assimilation rate (NAR) in various plants, both in the field1 3 and as responses induced under laboratory conditions45, investigations with higher plant systems are complicated by a combination of acclimatory response with ...Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesLarson, D. W. ; Matthes, U. ; Gerrath, J. A. ; Gerrath, J. M. ; Nekola, J. C. ; Walker, G. L. ; Porembski, S. ; Charlton, A. ; Larson, N. W. K.
[s.l.] : Macmillan Magazines Ltd.
Published 1999Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] An undisturbed ancient woodland, dominated by tiny, slow-growing and widely spaced trees, grows on vertical cliffs of the Niagara escarpment in southern Canada. To investigate whether this woodland is unusual or is part of a previously undetected global pattern, we sampled ages and radial ...Type of Medium: Electronic ResourceURL: