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  • Springer  (130)
  • American Society of Hematology  (10)
  • 1995-1999  (80)
  • 1980-1984  (60)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Biological optimality: Comparison of generalized feasibility and optimality conditions for linear, error-minimizing systems (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 777-791 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An attempt is made to compare the conditions for the general error-optimality of linear systems developed by Kalman with the conditions for feasibility of linear models of neuromuscular and physiological control systems. Models of three actual physiological systems are tested for both the above criteria. Theoretical analysis presented here shows that there are no simple relationships between the two sets of conditions. Analysis carried out on the physiological systems models suggests the need for a general set of conditions for other optimality criteria, such as time and energy minimization, similar to Kalman's condition for error minimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02465180
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structures of a series of 3,7-bis-(arylazo)-1,3,5,7-tetraazabicyclo[3.3.1]nonanes (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 797-809 
    Details
    ISSN: 1572-8854
    Keywords: Crystal structure ; bicyclononane ; triazene ; bis-triazene ; nitrile substituent ; nitro substituent ; trifluoromethyl substituent ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of a series of 3,7-bis(arylazo)-1,3,5,7-tetraazabicyclo[3.3.1] nonanes (1a–d) have been determined by single crystal X-ray diffraction analysis. All four compounds have the same feature, that the tetraazabicyclononane unit assumes a cage-like structure with the aryltriazene moieties lying parallel to one another so that the aryl rings are held together by π – π stacking. Crystal data: 1a C17H18N10O4, triclinic, space group P − 1, a = 9.8899(10), b = 13.0845(13), c = 16.458(2) Å, α = 94.095(2)°, β = 107.004(2)°, γ = 111.027(2)°, V = 1863.5(3) Å3 and Z = 4; 1b, C19H18F6N8, orthorhombic, space group Pbca, a = 15.3210(8), b = 10.9512(6), c = 24.5698(13) Å, V = 4122.4(4) Å3 and Z = 8; 1c C19H18N10, monoclinic, space group P21/n a = 6.3742(6), b = 13.7343(13), c = 21.542(2)Å, β = 97.738(2)°, V = 1868.8(3) Å3, and Z = 4; 1d, C19H18N10, monoclinic, space group P21/c, a = 18.205(2), b = 17.398(2), c = 12.784(12) Å, β = 109.480(2)°, V = 3818.0(6) Å3, and Z = 8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021823619465
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  • 3
    Electronic Resource
    Electronic Resource
    The crystal structure of 2-benzoylpyridine N4-methyl-N4-phenylthiosemicarbazone (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 861-864 
    Details
    ISSN: 1572-8854
    Keywords: Thiosemicarbazone ; 2-benzoylpyridine ; N4-substituted ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 2-Benzoylpyridine N4-methyl-N4-phenylthiosemicarbazone, HBz4MePh, monoclinic,P2(1)/n a=9.141(2),b=18.507(4),c=11.401(2) Å, β=110.58(3)o,V=1805.6(9) Å3,Z=4, μ=1.655 mm−1. HBz4MePh crystallizes in a hydrogen bonded Z isomeric conformation with respect to the C7−N2 bond. The intramolecular hydrogen bond is between N3−H...N1, and the S atom isZ to the azomethine nitrogne, N2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01670320
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  • 4
    Electronic Resource
    Electronic Resource
    Photoreceptor properties of an ectopic eye in the fleshfly,Sarcophaga bullata (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 993-994 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ectopic eyes were produced on the fleshfly,Sarcophaga bullata by transplantation of imaginal eye discs. Electrophysiological and histological observations of these supernumerary eyes indicate the absence of synaptic connections between retinular cells and higher order neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953841
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  • 5
    Electronic Resource
    Electronic Resource
    Development of visual sensitivity in the fly,Sarcophaga bullata (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 1318-1319 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ontogeny of light response in the compound eyes of the fly,Sarcophaga bullata was investigated. Even though the eyes are structurally differentiated before eclosion they become electrophysiologically functional only after eclosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990392
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  • 6
    Electronic Resource
    Electronic Resource
    The AFM as a tool for chromosomal dissection – the influence of physical parameters (1998)
    Springer
    Applied physics 66 (1998), S. S579 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 87.64.Dz; 87.80.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051205
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  • 7
    Electronic Resource
    Electronic Resource
    Analytical Techniques for Quantifying Direct, Residual, and Oral Exposure of an Insect Parasitoid to an Organophosphate Insecticide (1996)
    Springer
    Bulletin of environmental contamination and toxicology 57 (1996), S. 683 -690 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900244
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  • 8
    Electronic Resource
    Electronic Resource
    Parathyroid Hormone-Related Protein (1–37) Induces cAMP Response in Human Osteoblast-Like Cells (1998)
    Springer
    Calcified tissue international 62 (1998), S. 250-254 
    Details
    ISSN: 1432-0827
    Keywords: Key words: PTHrP – PTH — cAMP — Human osteoblast-like cells — CHO cells — UMR 106-01 cells.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. During recent years parathyroid hormone-related protein (PTHrP) research has been focused on the physiological functions of different fragments of the PTHrP molecule. Here we demonstrate that PTHrP (1–37) induced cyclic adenosine monophosphate (cAMP) response in primary human osteoblast-like cells, which were well characterized by the presence of alkaline phosphatase activity and osteocalcin production after stimulation with 1,25-dihydroxyvitamin D3. However, there was no cAMP response to PTHrP (58–77). Furthermore, the response to PTHrP (1–37) was dose dependent, with a significant increase at 1 nM. The presence of PTHrP (1–37)-induced cAMP response in human osteoblast-like cells implies that aminoterminal PTHrP fragments may exert important functions in the bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900425
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  • 9
    Electronic Resource
    Electronic Resource
    Categorical models for local names (1996)
    Springer
    Higher-order and symbolic computation 9 (1996), S. 77-107 
    Details
    ISSN: 1573-0557
    Keywords: Lambda-calculus ; functional programming ; dynamic allocation ; category theory ; monads
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper describes the construction of categorical models for thenu-calculus, a language that combines higher-order functions with dynamically creatednames. Names are created with local scope, they can be compared with each other and passed around through function application, but that is all. The intent behind this language is to examine one aspect of the imperative character of Standard ML: the use of local state by dynamic creation of references. The nu-calculus is equivalent to a certain fragment of ML, omitting side effects, exceptions, datatypes and recursion. Even without all these features, the interaction of name creation with higher-order functions can be complex and subtle; it is particularly difficult to characterise theobservable behaviour of expressions. Categorical monads, in the style of Moggi, are used to build denotational models for the nu-calculus. An intermediate stage is the use of a computational metalanguage, which distinguishes in the type system between values and computations. The general requirements for a categorical model are presented, and two specific examples described in detail. These provide a sound denotational semantics for the nu-calculus, and can be used to reason about observable equivalence in the language. In particular a model using logical relations is fully abstract for first-order expressions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01806033
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  • 10
    Electronic Resource
    Electronic Resource
    The soft X-ray polychromator for the Solar Maximum Mission (1980)
    Springer
    Solar physics 65 (1980), S. 53-71 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 1.4–22.4 Å range of the soft X-ray spectrum includes a multitude of emission lines which are important for the diagnosis of plasmas in the 1.5–50 million degree temperature range. In particular, the hydrogen and helium-like ions of all abundant solar elements with Z 〉 7 have their primary transitions in this region and these are especially useful for solar flare and active region studies. The soft X-ray polychromator (XRP) is a high resolution experiment working in this spectral region. The XRP consists of two instruments with a common control, data handling and power system. The bent crystal spectrometer is designed for high time resolution studies in lines of Fe i-Fe xxvi and Ca xix. The flat crystal scanning spectrometer provides for 7 channel polychromatic mapping of flares and active regions in the resonance lines of O viii, Ne ix, Mg xi, Si xiii, S xv, Ca xix, and Fe xxv with 14″ spatial resolution. In its spectral scanning mode it covers essentially the entire 1.4–22.5 Å region. This paper summarizes the scientific objectives of the XRP experiment and describes the characteristics and capabilities of the two instruments. Sufficient technical information for experiment feasibility studies is included and the resources and procedures planned for the use of the XRP within the context of the Solar Maximum Mission is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151384
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