Search Results - (Author, Cooperation:H. Pritchard)
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1Latest Papers from Table of Contents or Articles in PressA. Shepherd ; E. R. Ivins ; G. A ; V. R. Barletta ; M. J. Bentley ; S. Bettadpur ; K. H. Briggs ; D. H. Bromwich ; R. Forsberg ; N. Galin ; M. Horwath ; S. Jacobs ; I. Joughin ; M. A. King ; J. T. Lenaerts ; J. Li ; S. R. Ligtenberg ; A. Luckman ; S. B. Luthcke ; M. McMillan ; R. Meister ; G. Milne ; J. Mouginot ; A. Muir ; J. P. Nicolas ; J. Paden ; A. J. Payne ; H. Pritchard ; E. Rignot ; H. Rott ; L. S. Sorensen ; T. A. Scambos ; B. Scheuchl ; E. J. Schrama ; B. Smith ; A. V. Sundal ; J. H. van Angelen ; W. J. van de Berg ; M. R. van den Broeke ; D. G. Vaughan ; I. Velicogna ; J. Wahr ; P. L. Whitehouse ; D. J. Wingham ; D. Yi ; D. Young ; H. J. Zwally
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-12-01Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Antarctic Regions ; *Climate Change ; Geographic Information Systems ; Greenland ; *Ice CoverPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1365-3040Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: BiologyNotes: Abstract Fluorescein diacetate (FDA) staining (0.25% FDA for 10 min) was found to be a suitable technique for the rapid determination of orchid seed viability. Penetration of the dye through the testa varies between species, thus the test is ideally performed on isolated embryos. Direct FDA application to isolated embryos of seeds taken from dry storage, but after the surface had been sterilized, elicits a poor staining reaction. Incubation of the surface sterilized seeds in distilled water for 16 h, either at 6°C or at room temperature, prior to applying the test was found to overcome this problem. In the range of species studied, FDA staining accurately indicates seed viability when compared with germination of seeds on sterile nutrient media. Storage of dry Dactylorhiza fuchsii (Druce) Soó seed at an elevated temperature of 62°C indicated that, under such conditions of accelerated ageing, the FDA test accurately describes the rate of seed viability loss.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 0003-9861Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] THERE is an error in one of your “Notes” of last week which you may be glad to have corrected. It is not to Niepce de St. Victor that the citizens of Chalons-sur-Saône (a town, by the way, not to be mistaken for Chalons in the Champagne country) are about to erect a statue, but to his uncle, ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesFuller, B. ; Morris, G. ; Grout, B. ; Bernard, A. ; Farrant, J. ; Pritchard, H. ; McLellan, M.
Amsterdam : ElsevierStaff ViewISSN: 0011-2240Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyMedicineType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] THERE is a good old story told of a country editor who once met a pressing demand for copy in a singularly ingenious manner. At the moment of going to press, it was found to the consternation of the printer that a whole column was lacking. What was to be done? The whole staff was in confusion ...Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesMCBROOM, N. ; WASHBURN, M. F. ; PRITCHARD, H. ; KEPLER, H.
Urbana, etc. : Periodicals Archive Online (PAO)
Published 1927Staff ViewISSN: 0002-9556Topics: PsychologyNotes: EDITOR'S NOTESURL: -
8Articles: DFG German National LicensesMCCREA, J. 〈B.A..〉 ; PRITCHARD, H. J. 〈B. A. (Toronto).〉
Urbana, etc. : Periodicals Archive Online (PAO)
Published 1897Staff ViewISSN: 0002-9556Topics: PsychologyURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1420-9071Source: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Zusammenfassung Zytochemischer Nachweis der alkalischen und und sauren Phosphatase, sowie der zytochromischen Oxydase in den herzförmigen Embryonen der DikotyledonStellaria media. Die Fermente erwiesen sich als wichtig für normales Wachstum und die Differenzierung der Embryonen.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] IN reading over the interesting table of velocities drawn up by Mr. James Jackson, and published in NATURE to-day (p. 604), there is one item omitted, which the author may like to add to his list, viz. the rate at which detonation travels, as exemplified by a train of compressed gun-cotton. ...Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] SOME trials I have recently made with Swan's incandescent electric lamps give results that may possibly interest your readers. I employed throughout an electric stream of the same energy—that generated by thirty Grove cells, and as the whole experiment lasted but an hour, it may be assumed, for ...Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1432-2048Keywords: Key words: Desiccation sensitivity ; Imbibition ; Oil body ; Oleosin ; Recalcitrant seed ; Seed storageSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract. In order to clarify further the physiological role of oleosins in seed development, we characterized the oil-body proteins of several oilseeds exhibiting a range of desiccation sensitivities from the recalcitrant (Theobroma cacao L., Quercus rubra L.), intermediate (Coffea arabica L., Azadirachta indica A. Juss.) and orthodox categories (Sterculia setigera Del., Brassica napus L.). The estimated ratio of putative oleosins to lipid in oil bodies of Q. rubra was less than 5% of the equivalent values for rapeseed oil bodies. No oleosin was detected in T. cacao oil bodies. In A. indica cotyledons, oil bodies contained very low amounts of putative oleosins. Oil bodies both from C. arabica and S. setigera exhibited a similar ratio of putative oleosins to lipid as found in rapeseed. In C. arabica seeds, the central domain of an oleosin was partially sequenced. Using a low temperature field-emission scanning electron microscope, the structural stability of oil bodies was investigated in seeds after drying, storage in cold conditions and rehydration. Despite the absence or relative dearth of oleosins in desiccation-sensitive, recalcitrant oilseeds, oil bodies remained relatively stable after slow or fast drying. In A. indica seeds exposed to a lethal cold storage treatment, no significant change in oil-body sizes was observed. In contrast, during imbibition of artificially dried seeds containing low amounts of putative oleosins, the oil bodies fused to form large droplets, resulting in the loss of cellular integrity. No damage to the oil bodies occurred in imbibed seeds of Q. rubra, C. arabica and S. setigera. Thus the rehydration phase appears to be detrimental to the stability of oil bodies when these are present in large amounts and are lacking oleosins. We therefore suggest that one of the functions of oleosins in oilseed development may be to stabilize oil bodies during seed imbibition prior to germination.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1432-2234Keywords: Unimolecular fall-off ; Multi-exponential decay ; Collision efficiencySource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary We derive analytic expressions for the upper and lower bounds to the rate constant of a unimolecular reaction, which is treated as a competition between decay of reactive states and an arbitrary number of collisional relaxation processes all with different rate constants. The unimolecular rate is identified with the eigenvalue of smallest numerical magnitude. An analytic approximation to the corresponding eigenvector is also derived. Behaviour of the low-pressure rate constant is investigated and an analytic expression, in terms of the populations and the rates connecting them, is derived for the collision efficiency parameter β c . It is shown that there is a direct relationship between the limiting low-pressure rate and the reactive fraction of molecules only in the special case where all unreactive molecules are connected by a pure exponential collisional relaxation.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1432-2234Keywords: Disproportionation ; Recombination ; Unimolecular reactions ; Trajectory calculationsSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary Usingab initio potential surfaces, classical (co-planar) trajectory calculations were made for the combination of H+BeH and of CH+CH. For the former reaction, disproportionation to H2+Be was rare, occurring only for a linear H...H...Be configuration. Likewise, in the second case, the formation of CH2+C occurs only via a direct reaction. The principal mechanism in the CH+CH reaction is to form [C2H2]*, which dissociates into C2H + H, or very occasionally, directly into C2+H2. If the energy is very high, the C2H radical can dissociate into C2+H, but sometimes [C2H2]* itself may dissociate simultaneously into C2+H+H.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0020-7608Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical PhysicsSource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyNotes: The generalized algebraic eigenvalue problem (A - λB)x = 0 arises in the use of the variation method in quantum mechanics. If, within the limitations of the computer word-length, the basis set used to expand the trial wave function is linearly dependent, the matrix B becomes singular. Three different algorithms designed to deal with this difficulty have been investigated, paying special attention to the problem of identifying which members of the basis set are effectively linearly dependent. The advantages and limitations of each method are discussed.Additional Material: 1 Tab.Type of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 0020-7608Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical PhysicsSource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyNotes: The method proposed by Singh for the calculations of lower bounds to atomic binding energies has been generalized to encompass upper bounds as well. The result is a pair of related matrix eigenvalue problems, constructed from similar sets of basic matrix elements, with the solution of one yielding the tower bound, and of the other, the upper bound. The upper bounds are identical to those calculated by the Rayleigh-Ritz method, which can be useful when the inversion of the normalization matrix is ill-conditioned. The lower bounds are comparable with the best available in the literature. © 1993 John Wiley & Sons, Inc.Additional Material: 2 Ill.Type of Medium: Electronic ResourceURL: