Search Results - (Author, Cooperation:R. J. Harrison)
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1Latest Papers from Table of Contents or Articles in PressJ. F. Bryson ; C. I. Nichols ; J. Herrero-Albillos ; F. Kronast ; T. Kasama ; H. Alimadadi ; G. van der Laan ; F. Nimmo ; R. J. Harrison
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-01-23Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressR. R. Fu ; B. P. Weiss ; E. A. Lima ; R. J. Harrison ; X. N. Bai ; S. J. Desch ; D. S. Ebel ; C. Suavet ; H. Wang ; D. Glenn ; D. Le Sage ; T. Kasama ; R. L. Walsworth ; A. T. Kuan
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-11-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Articles: DFG German National LicensesStaff View
ISSN: 1471-0528Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: In normal pregnant women vitamin B12 levels in erythrocytes tend to be subnormal despite a normal serum vitamin B12 and the absence of anaemia.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National Licensesde Jong, W. A ; Harrison, R. J. ; Dixon, D. A.
College Park, Md. : American Institute of Physics (AIP)
Published 2001Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: A parallel implementation of the spin-free one-electron Douglas–Kroll–Hess (DKH) Hamiltonian in NWChem is discussed. An efficient and accurate method to calculate DKH gradients is introduced. It is shown that the use of a standard (nonrelativistic) contracted basis set can produce erroneous results for elements beyond the first row elements. The generation of DKH contracted cc-pVXZ(X=D,T,Q,5) basis sets for H, He, B–Ne, Al–Ar, and Ga–Br is discussed. The effect of DKH at the Hartree–Fock level on the bond distances, vibrational frequencies, and total dissociation energies for CF4, SiH4, SiF4, and Br2CO is discussed. It is suggested that the predominant effect of the scalar relativistic correction on the total dissociation energy can be calculated at the Hartree–Fock level if an adequate basis set is used. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesHarrison, R. J. ; Köler, T. Orozco
Oxford, UK and Boston, USA : Blackwell Publishers Ltd
Published 2001Staff ViewISSN: 1468-0092Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: ArchaeologyNotes: Using new provenance studies on stone implements from the Valencia region of Spain between 5500–2000 BC, we show not only the large scale of some exchange systems, but also consider how, and why, tastes and fashions are co-ordinated over much of the Western Mediterranean. The study considers the processes of raw material substitution underlying the observed patterns. These processes operate for a wide range of lithic materials, including rare minerals like variscite and fossil shells for ornaments. Simple gravity models of distribution and exchange predominate at all periods. Our study extends from Portugal to Italy, and indicates that a system of shared symbolic values, of axeheads, beads and bracelets, was in operation. The discussion concludes that consumption patterns were centred on these values rather than functional categories of tools or prestige items.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] EXAMINATION of a series of the reproductive organs from three species of antarctic seals, collected by the members of the Falkland Islands Dependencies Survey, has brought to light several interesting phenomena in the ovaries of the Weddell seal (Leptonychotes weddelli), the crab-eater seal ...Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Radiotelemetry devices5 have been implanted in the hypo-dermis of the back and neck of 12?18 month old grey seals (Halichoerus grypus) to follow heart rate changes in unrestrained seals trained to dive on command. The package had electrodes extending through the hypodermis across the thorax and the ...Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The keeper at Woburn Park informs us that mating occurs in July; but the stags begin the 'rounding up' of the hinds in June. Mating usually occurs at night. Parturition has been reported in early April, but the usual date is mid-April to May; the latest date recorded was in September, the latter ...Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] REPRODUCTION in the European badger has been the subject of controversy for many years, and one authority or another has made claims for each month of the year to be that. of the mating season. Those investigators1-3 who have recently examined the reproductive pattern comment at length on the ...Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] ALL mammals can withstand complete submersion,in water for a little while ; but some forms are able to remain submerged at considerable depths for remarkable periods of time. It will be obvious that there are few accurate observations on the maximum length of time for which any mammal can remain ...Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 0002-1482Topics: HistoryAgriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionURL: -
12Articles: DFG German National LicensesAMOROSO, E. C. ; HARRISON, R. J. ; MATTHEWS, L. HARRISON ; ROWLANDS, I. W.
[s.l.] : Nature Publishing Group
Published 1951Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] THERE is convincing physiological evidence indicating that, in several species of mammals, including man, horse and donkey, oestrogens and progesterone are elaborated by extra-ovarian tissues1'2. It is generally believed that the placenta represents the new source, though the available evidence ...Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] EXAMINATION of the ovaries of some of the lower primates has revealed the presence of numbers of multiovular follicles and multimiclear oocytes. Multiovular follicles have occasionally been reported in the ovaries of a great variety of animals; but there has been no specific reference in the ...Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesHARRISON, R. J. ; TOMLINSON, J. D. W. ; BERNSTEIN, L.
[s.l.] : Nature Publishing Group
Published 1954Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] It had been desired to investigate the effects of raised external pressure on the animal's circulation, in an attempt to simulate the conditions during diving. Two live pups were satisfactorily and easily anaesthetized by Finer's method2. Attempts were made to place the anaesthetized animal on its ...Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesRedfern, S. A. T. ; Henderson, C. M. B. ; Wood, B. J. ; Harrison, R. J. ; Knight, K. S.
[s.l.] : Nature Publishing Group
Published 1996Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] It has been recognized for some time that non-equilibrium cation ordering in minerals might provide a means to measure rock cooling rates, from early work on Mg/Fe ordering in amphi-boles6 and extensive studies of pyroxenes7'8 to more recent analysis of Al/Si ordering in alkali feldspars9. ...Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1432-2021Source: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesPhysicsNotes: Abstract The temperature evolution of the displacive order parameter of hypersolvus, Al-Si disordered alkali feldspars with composition Or31 and Or20 was measured using X-ray powder diffractometry. The monoclinic — triclinic transition shows second-order behaviour and bilinear order parameter-strain coupling. The transition temperatures are 443 K (Or31) and 750 K (Or20). Temperature evolution of the peak width, Γ, of the 132 reflection was found to depend on the grain size of the sample with an anomalous increase of Γ at T c in fine-grained material. This effect has been rationalised in terms of surface relaxations occuring as T approaches T c . No anomalous line broadening occurs in coarse-grained material.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesWiltshire, E. J. ; Poplawski, N. K. ; Harbord, M. G. ; Harrison, R. J. ; Fletcher, J. M.
Springer
Published 2000Staff ViewISSN: 1573-2665Source: Springer Online Journal Archives 1860-2000Topics: MedicineType of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1432-2021Keywords: Key words Kinetics ; Order ; Mechansism ; Spinel ; GeospeedometrySource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesPhysicsNotes: Abstract The kinetics of non-convergent cation ordering in MgFe2O4 have been studied by measuring the Curie temperature (T c) of synthetic samples as a function of isothermal annealing time. The starting material was a synthetic sample of near-stoichiometric MgFe2O4, synthesised from the oxides in air and quenched from 900 °C in water. Ordering experiments were performed using small chips of this material and annealing them at temperatures between 450 °C and 600 °C. The chips were periodically removed from the furnace, and their Curie temperatures were determined from measurements of alternating-field magnetic susceptibility (χ) as a function of temperature (T) to 400 °C. The Curie temperature of MgFe2O4 is very sensitive to the intracrystalline distribution of Fe3+ and Mg cations between tetrahedral and octahedral sites of the spinel crystal structure, and hence provides a very sensitive probe of the cation ordering process. The χ-T curve for the starting material displays a single sharp magnetic transition at a temperature of 303 °C. During isothermal annealing, the χ-T curve develops two distinct magnetic transitions; the first at a temperature corresponding to T c for the disordered starting material and the second at a higher temperature corresponding to T c for the equilibrium ordered phase. The size of the magnetic signal from the ordered phase increases smoothly as a function of time, until equilibrium is approached and the shape of the χ-T curve corresponds to a single sharp magnetic transition for the homogeneous ordered phase. These observations demonstrate that cation ordering in MgFe2O4 proceeds via a heterogeneous mechanism, involving the nucleation and growth of fine-scale domains of the ordered phase within a matrix of disordered material. Disordering experiments were performed by taking material equilibrated at 558 °C and annealing it at 695 °C. The mechanism of isothermal disordering is shown to involve nucleation and growth of disordered domains within an ordered matrix, combined with continuous disordering of the ordered matrix. This mixed mechanism of disordering may provide an explanation for the difference between the rates of ordering and disordering observed in MgFe2O4 using X-ray diffraction. The origin of the heterogeneous ordering/disordering mechanism is discussed in terms of the Ginzburg-Landau rate law. It is argued that heterogeneous mechanisms are likely to occur in kinetic experiments performed far from equilibrium, whereas a homogeneous mechanism may operate under slow equilibrium cooling. The implications of these observations for geospeedometry are discussed.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1432-0878Keywords: Adenohypophysis ; Delphinus delphis ; Cell types ; Ultrastructure ; Marine environmentSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary The ultrastructural appearances of the cell types are described in the pars distalis of common (Pacific) dolphins, Delphinus delphis. Tentative functions are assigned to these cells and discussed in relation to some of the known adaptations of these mammals to a marine environment.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesGray, D. J. ; Hiebert, E. ; Lin, C. M. ; Compton, M. E. ; McColley, D. W. ; Harrison, R. J. ; Gaba, V. P.
Springer
Published 1994Staff ViewISSN: 1573-5044Keywords: cantaloupe ; Cucumis melo ; genetic transformation ; GUS ; transient expressionSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract A modified particle inflow gun (PIG), that utilized a plastic vacuum chamber, was compared with a conventional PIG by bombarding cantaloupe (Cucumis melo L.) cotyledon basal quarters with plasmid pBI221 (Clontech Inc.) containing a β-glucuronidase (GUS) gene adsorbed onto tungsten particles. Both guns produced an equivalent number of transient GUS foci when tested at 410 kPa (60 psi), 620 kPa (90 psi) or 830 kPa (120 psi) helium and at a 10, 15 or 20 cm gap between the specimen and DNA/particle holder screen. For both guns, treatments utilizing the lower pressure and/or the greater distance generally produced significantly fewer GUS-positive foci. The plastic PIG was convenient to operate and could be built with simple hand tools in less than 40 minutes, using readily available parts.Type of Medium: Electronic ResourceURL: