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  • Springer  (44)
  • Oxford University Press  (1)
  • 1995-1999  (34)
  • 1970-1974  (11)
  • 1
    Electronic Resource
    Electronic Resource
    A new actinomycin-like antibiotic produced by a mutant strain ofStreptomyces indicus (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 595-596 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Aus einer Mutante vonStreptomyces indicus Chakrabarty sp. nov. wurde das neue Antibiotikum MT-10 (orange-gelbe Kristalle) isoliert. Die antibakterielle und antifungische Aktivität wurde untersucht und festgestellt, dass MT-10 mit Actinomycin D verwandt ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147622
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  • 2
    Electronic Resource
    Electronic Resource
    Steady hydromagnetic viscous flow in an annulus with porous walls (1973)
    Springer
    Pure and applied geophysics 105 (1973), S. 825-835 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An exact solution of electrically conducting viscous incompressible flow in an annulus with porous walls under an external radial magnetic field is obtained when the motion is due to both longitudinal motion of the inner boundary and a constant axial pressure gradient, and the fluid injection rate at one wall is equal to the fluid withdrawal rate at the other. The fluid may be injected at the outer wall and sucked at the inner or vice versa. The solution for the hydromagnetic flow between two flat plates has also been obtained as a limiting case of the annulus problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875831
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  • 3
    Electronic Resource
    Electronic Resource
    Finite element design of manipulator-coupled spacecraft for a research testbed (1995)
    Springer
    Journal of intelligent and robotic systems 13 (1995), S. 75-91 
    Details
    ISSN: 1573-0409
    Keywords: Harmonic drives ; Manipulator-Coupled Spacecraft ; Control Moment Gyro ; Finite Element Analysis ; Lagrangian Equations of Motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes the design and analysis of a research testbed developed to study the control of manipulator-coupled spacecraft with independent attitude control systems. This scenario could present itself in the assembly of Space Station Freedom (SSF). SSF assembly calls for a rendezvous of the Space Shuttle (SS) with SSF. Part of the assembly process requires that both spacecraft be coupled via the Space Shuttle Remote Manipulator System. An additional criterion that poses increased complexity is that the Space Shuttle controls and Space Station controls can not communicate. The technical issue involved is unwanted vibrations of the coupled-configuration that occur retraction and the complications due to non-interacting control systems. To understand these vibrations and possible complications, a research testbed has been built at the Marshall Space Flight Center in Huntsville, AL. To build the testbed, the manipulator links joints, and vehicles that represent the Space Shuttle and Space Station had to be designed. Pre-design simulation studies using ANSYS [1] (a Finite Element Computer Code) is used to size and design the manipulator links for the experimental facility. The ANSYS results were verified by the development of the Lagrangian Equations of motion. The Harmonic drives used as joints for the two link, three joint manipulator have been dissected into free body diagrams to ensure proper load paths in the ANSYS models. Accurate simulation of manipulator-coupled spacecraft is an important technology for NASA to understand. This paper outlines the methodology behind the preliminary design of a research testbed developed to help NASA gain knowledge in this area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01664756
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  • 4
    Electronic Resource
    Electronic Resource
    Deflection characteristics of some special configurations of snake-type robots (1995)
    Springer
    Journal of intelligent and robotic systems 12 (1995), S. 145-153 
    Details
    ISSN: 1573-0409
    Keywords: Redundant robot ; critical manipulation ; backbone curve ; end-point deflection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The redundant robots analyzed here have large numbers of degrees of freedom. Such robots are analogous to snake or tentacles and are useful for operation in highly constrained environments and novel forms of locomotion — here it has been defined as critical manipulation. In this paper the end-point deflection of hyper-redundant robots have been studied by parameterization of the flexible links of the robot manipulator. A number of planar configurations of the redundant manipulator were taken into consideration for the present study and the configuration which gives minimum end-point deflection has been recommended for the critical manipulation. This work is significant for some of the research activities recently going on in NASA's Kennedy Space Center towards the application of hyper-redundant robots for manipulation inside the space Shuttle Cargo Bay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01258383
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  • 5
    Electronic Resource
    Electronic Resource
    Unsteady hydromagnetic flow in an annulus with porous Walls when the inner boundary starts moving from rest (1970)
    Springer
    Pure and applied geophysics 78 (1970), S. 86-95 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The problem of unsteady hydromagnetic flow in a porous annulus when the inner boundary starts moving from rest with a constant longitudinal velocity is considered. For the case of equal Reynolds number and magnetic Reynolds number Laplace transforms of the solutions for the axial components of velocity and magnetic field are obtained in terms of modified Bessel functions. The inversions are effected for the cases of very large and small Reynolds number when the pressure gradient vanishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874776
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  • 6
    Electronic Resource
    Electronic Resource
    Unsteady hydromagnetic flow in a porous annulus with time-dependent pressure gradient (1970)
    Springer
    Pure and applied geophysics 79 (1970), S. 33-40 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Problem of unsteady motion of a conducting viscous incompressible fluid through an annulus with porous walls under an external radial magnetic field has been discussed. Taking the Reynolds number and the magnetic Reynolds number to be equal, exact solution of the problem is obtained in terms of Bessel functions when the motion is due to the time-dependent pressure gradient or the time-dependent velocity of either of the boundaries. Two types of dependence on time are considered; one, exponentially increasing, and the other, exponentially decreasing. Solutions in certain extreme cases are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875476
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  • 7
    Electronic Resource
    Electronic Resource
    Laminar hydromagnetic flow in an annulus with uniformly porous walls of different permeability (1971)
    Springer
    Pure and applied geophysics 89 (1971), S. 139-150 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The problem of steady laminar hydromagnetic flow in a porous annulus of different permeability in the presence of a magnetic field is considered and solved by a method of perturbation. The case when the injection or the withdrawal rate at the outer wall, depending on the sign of the normal velocity at this wall, is greater than or equal to such rate at the inner wall is given in details. Some numerical results regarding the friction coefficients at the walls and the axial pressure coefficient and velocity distribution have been appended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875211
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  • 8
    Electronic Resource
    Electronic Resource
    The complete primary structure of mouse 20S proteasomes (1999)
    Springer
    Immunogenetics 49 (1999), S. 835-842 
    Details
    ISSN: 1432-1211
    Keywords: Key words Proteasome ; Antigen processing ; Multicatalytic proteinase ; Proteolysis ; Protein degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  The proteasome is a large multicatalytic proteinase that plays a role in the generation of peptides for presentation by major histocompatibility complex class I molecules. The 20S proteolytic core of mammalian proteasomes is assembled from a group of 17 protein subunits that generate a distinctive pattern of spots upon two-dimensional gel electrophoresis. The genes for most of these subunits have been cloned from humans and rats. We isolated cDNA clones for the mouse orthologues of ten of the subunits [PSMA1 (C2), PSMA2 (C3), PSMA3 (C8), PSMA4 (C9), PSMA5 (ZETA), PSMA6 (IOTA), PSMA7 (C6-I), PSMB2 (C7-I), PSMB3 (C10-II), and PSMB5 (X)] to complete the cloning of all of the mouse subunits. Using antisera raised against these subunits or their orthologues, we verified the identity of these proteins by two-dimensional NEPHGE-PAGE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050562
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  • 9
    Electronic Resource
    Electronic Resource
    X-ray crystal structure of [VO(DPA)(H2O)2]·2H2O (DPA=Dipicolinate dianion) (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 183-185 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The X-ray crystal structure of the trans-diaqua complex [VO(DPA)(H2O2)]·2H2O (1) (DPA=dipicolinate dianion) has been determined. Comparison with the known structure of [VO(DPA)(o-phen)]·3H2O (2), obtained from (1) by displacement of the two coordinated aqua molecules, shows that the coordination sphere around vanadium is reorganised during this reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006981321346
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  • 10
    Electronic Resource
    Electronic Resource
    Partial purification and characterization of a soluble protein phosphatase fromLeishmania donovani promastigotes (1995)
    Springer
    Molecular and cellular biochemistry 148 (1995), S. 191-198 
    Details
    ISSN: 1573-4919
    Keywords: protein phosphatase ; Leishmania donovani ; promastigote ; dephosphorylation ; visceral leishmaniasis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A soluble protein phosphatase from the promastigote form of the parasitic protozoanLeishmania donovani was partially purified using Sephadex G-100, DEAE-cellulose and again Sephadex G-100 columns. The partially purified enzyme showed a native molecular weight of about 42, 000 in both Sephadex G-100 and sucrose density gradient centrifugation. The sedimentation constant, stokes radius and frictional ratio were found to be 3.43S, 2.8 nm and 1.20 respectively. The enzyme preferentially utilized phosphohistone as the best exogenous substrate. Mg2+ ions were essential for enzyme activity; among other metal ions Mn2+ can replace Mg2+ to a certain extent whereas Ca2+, Co2+ and Zn2+ could not substitute for Mg2+. The pH optimum of the enzyme was 6.5–7.5 and the temperature optimum 37°C. The apparent Km for phosphohistone was 7.14 μM. ATP, ADP, inorganic phosphate and pyrophosphate had inhibitory effect on the enzyme activity whereas no inhibition was observed with sodium tartrate and okadaic acid. These results suggest thatL. donovani promastigotes possess a protein phosphatase which has similar characteristics with the mammalian protein phosphatase 2C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928156
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