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  • 1
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    Bruinrode wespenorchis (Epipactis atrorubens (Hoffm.) Besser) in een oud Zeeuws herbarium (2004)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 30 no. 1, pp. 10-11
    Details
    Publication Date: 2024-01-12
    Description: As a result of the reorganisation of the biological collections in the \xe2\x80\x98Zeeuws Biologisch Museum\xe2\x80\x99 at Oostkapelle, Province of Zealand, two small herbaria were saved from obscurity. One of them was made by Christiaan Romijn (1910\xe2\x80\x931988), who collected mainly on the Zealand island of Walcheren.\nRomijn\xe2\x80\x99s herbarium contains a specimen of Epipactis atrorubens (Hoffm.) Besser, which was collected in the dunes near Domburg, Walcheren, in August 1927. This specimen provides supporting evidence for the correctness of disputable records of E. atrorubens on Walcheren given by the botanists Walraven and Lako in the late 19th century. Later (and earlier) records of the occurrence of the species on Walcheren are not known.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Modified rapid preparation of fatty acid esters from lipids for gas chromatographic analysis (1967)
    s.l. : American Chemical Society
    Analytical chemistry 39 (1967), S. 848-849 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60251a031
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  • 3
    Electronic Resource
    Electronic Resource
    Report on the algorithmic language ALGOL 60 (1960)
    Springer
    Numerische Mathematik 2 (1960), S. 106-136 
    Details
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386216
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  • 4
    Electronic Resource
    Electronic Resource
    Revised report on the algorithmic languageAlgol 60 (1962)
    Springer
    Numerische Mathematik 4 (1962), S. 420-453 
    Details
    ISSN: 0945-3245
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The report gives a complete defining description of the international algorithmic languageAlgol 60. This is a language suitable for expressing a large class of numerical processes in a form sufficiently concise for direct automatic translation into the language of programmed automatic computers. The introduction contains an account of the preparatory work leading up to the final conference, where the language was defined. In addition the notions reference language, publication language, and hardware representations are explained. In the first chapter a survey of the basic constituents and features of the language is given, and the formal notation, by which the syntactic structure is defined, is explained. The second chapter lists all the basic symbols, and the syntactic units known as identifiers, numbers, and strings are defined. Further some important notions such as quantity and value are defined. The third chapter explains the rules for forming expressions and the meaning of these expressions. Three different types of expressions exist: arithmetic, Boolean (logical), and designational. The fourth chapter describes the operational units of the language, known as statements. The basic statements are: assignment statements (evaluation of a formula), go to statements (explicit break of the sequence of execution of statements), dummy statements, and procedure statements (call for execution of a closed process, defined by a procedure declaration). The formation of more complex structures, having statement character, is explained. These include: conditional statements, for statements, compound statements, and blocks. In the fifth chapter the units known as declarations, serving for defining permanent properties of the units entering into a process described in the language, are defined. The report ends with two detailed examples of the use of the language and an alphabetic index of definitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386340
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave rotational spectra of the Ar3–NH3 van der Waals tetramer (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 2379-2387 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational spectra of the Ar3–NH3 van der Waals tetramer were recorded between 4 and 17 GHz using a pulsed jet Fourier transform microwave spectrometer. Five isotopomers, namely Ar3–NH3, Ar3–15NH3, Ar3–ND3, Ar3–ND2H, and Ar3–NDH2, were studied and the spectra observed are characteristic of oblate symmetric tops. The transitions were assigned to three different K progressions, K=0, K=3, and K=6 of the ground internal rotor state of the complex. A small inversion tunneling splitting was observed for each of the deuterium containing isotopomers. For Ar3–NH3 and Ar3–15NH3, one of these inversion components has a spin statistical weight of zero in the ground state and is, therefore, not observed. The 14N quadrupole hyperfine structure was resolved and included in the fit of the spectroscopic constants for each of the 14N containing isotopomers. The resulting spectroscopic constants were used to estimate the structure of the complex. Furthermore, the 14N nuclear quadruple coupling constants and the inversion tunneling splittings observed for the various isotopomers contain information about the dynamics of the ammonia subunit within the Ar3–NH3 complex. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1433963
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  • 6
    Electronic Resource
    Electronic Resource
    Microwave spectra of the Ar–ND3 van der Waals complex and its partially protonated isotopomers (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 3968-3976 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational spectra of the Ar–ND3 van der Waals complex were measured in the frequency range between 4 and 19 GHz using a pulsed jet cavity Fourier transform microwave spectrometer. The isotopomers studied include those with ND3, NHD2, and NH2D. A tunneling splitting due to the inversion of the ammonia subunit within the ground state of the complex was observed for all three isotopomers. This splitting cannot be measured in Ar–NH3 for spin statistical reasons. Nuclear quadrupole hyperfine structure of rotational transitions arising from the 14N nucleus was resolved and the corresponding nuclear quadrupole coupling constants were determined. A smaller nuclear quadrupole splitting arising from the deuterium nuclei was observed but not resolved. The ground state spectroscopic constants are compared with experimental and theoretical data previously reported for Ar–NH3. Additional transitions were observed for Ar–ND3 and assigned to the two inversion tunnelling states of an excited internal rotor state. A fit of the spectroscopic constants for these two states suggests the presence of a Coriolis perturbation along the lines of that observed in the microwave spectrum of Ar–NH3. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1344200
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of the Ne-NH3 van der Waals complex: Rotational spectrum and ab initio calculations (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6504-6512 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Ne-NH3 van der Waals complex was investigated through analysis of microwave spectra and the construction of ab initio potential energy surfaces. Rotational spectra of the ground internal rotor state of Ne-NH3 were recorded between 7 and 24 GHz using a Balle–Flygare-type Fourier transform microwave spectrometer. In total, ten isotopomers were studied, which include 20Ne and 22Ne paired with NH3, 15NH3, ND3, ND2H, and NDH2. The spectroscopic constants including the 14N quadrupole coupling constants were determined and used to estimate structural and dynamical details of the van der Waals complex. For each deuterium-substituted isotopomer, a tunneling splitting was observed due to the inversion of NH3 within the ground state of the complex. One of these inversion components is missing for the NH3 and 15NH3 containing isotopomers for spin statistical reasons. Ab initio potential energy surfaces were constructed for three different umbrella angles of NH3 within the complex to provide information about the interaction along the NH3 inversion pathway. The interaction energies were calculated using Møller–Plesset perturbation theory to fourth order. All three surfaces have minima corresponding to structures where the van der Waals bond (the line from the center of mass of NH3 to the Ne atom) lies perpendicular to the C3 axis of NH3, with the neon atom sitting between two hydrogen atoms. At this orientation, the potential well depth is 62.66 cm−1 (285.5 μhartree) at a van der Waals bond length of 3.30 Å (6.24 bohr) for the experimental equilibrium NH3 monomer geometry. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1403338
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  • 8
    Electronic Resource
    Electronic Resource
    Diamond anvil cell and cryostat for low-temperature optical studies (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 121-124 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A diamond anvil cell and cryostat suitable for optical studies from 1.1 K to room temperature at ultrahigh pressures is described. Special provisions and techniques for loading condensable gases (cryogases) are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138514
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  • 9
    Electronic Resource
    Electronic Resource
    Inhibition of Rb^+ uptake in yeast by Ca^2^+ is caused by a reduction in the surface potential and not in the Donnan potential of the cell wall
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 812 (1985), S. 1-8 
    Details
    ISSN: 0005-2736
    Keywords: (S. cerevisiae) ; Ca^2^+ ; Protoplast ; Rb^+ uptake ; Surface potential
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(85)90514-0
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  • 10
    Electronic Resource
    Electronic Resource
    Factor IXa protects activated factor VIII against inactivation by activated protein C
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 125 (1984), S. 177-183 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0006-291X(84)80351-4
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