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  • 1
    Electronic Resource
    Electronic Resource
    Normal Form Description of Broken Symmetries (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 3-4 (Jan. 1991), p. 57-76 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.3-4.57.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Structural shape sensitivity analysis for nonlinear material models with strain softening (1999)
    Springer
    Structural optimization 17 (1999), S. 162-171 
    Details
    ISSN: 0934-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes some considerations around the analytical structural shape sensitivity analysis when the structural behaviour is computed using the finite element method with a nonlinear constitutive material model. Traditionally, the structural sensitivity analysis is computed using an incremental approach based on the incremental procedures for the solution of the structural equilibrium problem. In this work, a direct (nonincremental) formulation for computing these structural sensitivities, that is valid for some specific nonlinear material models, is proposed. The material models for which the presented approach is valid are characterized by the fact that the stresses at any time t can be expressed in terms of the strains at the time t and, in some cases, the strains at a specific past time t u (t u 〈 t). This is the case of elasticity (linear as well as nonlinear), perfect plasticity and damage models. A special strategy is also proposed for material models with strain softening. For the cases where it is applicable, the sensitivity analysis proposed here allows us to compute the structural sensitivities around any structural equilibrium point after finishing the solution process and it is completely independent of the numerical scheme used to solve the structural equilibrium problem. This possibility is particularized for the case of a damage model considering a strain-softening behaviour. Finally, the quality and reliability of the proposed approach is assessed through its application to some examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195941
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  • 3
    Electronic Resource
    Electronic Resource
    Kinematic description of variability of fast movements: analytical and experimental approaches (1993)
    Springer
    Biological cybernetics 69 (1993), S. 485-492 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Analysis of variability of fast aimed movements predicts the properties of trajectory variance. The analysis is based on a kinematic model with nonlinear changes in “internal time”. The purpose of the work was to identify different sources of variability and their influence on the trajectory variance. An analytical expression for the speed-accuracy trade-off is introduced. Experiments were performed with subjects making single-joint elbow flexion movements over different distances as fast as possible with their eyes closed to memorized targets. Standard deviation of movement trajectory increased during the first part of the movement and subsequently decreased. The variance peaked after the time of peak velocity, close to the time of peak deceleration. A dependence of the trajectory variance on movement distance (speed-accuracy trade-off) was seen during the movement (at times of peak velocity and peak deceleration) but not after the movement termination. We conclude that the previously reported drop in the variability of movement trajectory during the deceleration phase does not necessarily mean a compensation by the control system but may result from purely kinematic properties of the movement. The importance of the time of measurement for analysis of the speed-accuracy trade-offs is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185420
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  • 4
    Electronic Resource
    Electronic Resource
    Kinematic description of variability of fast movements: analytical and experimental approaches (1993)
    Springer
    Biological cybernetics 69 (1993), S. 485-492 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Analysis of variability of fast aimed movements predicts the properties of trajectory variance. The analysis is based on a kinematic model with nonlinear changes in “internal time”. The purpose of the work was to identify different sources of variability and their influence on the trajectory variance. An analytical expression for the speed-accuracy trade-off is introduced. Experiments were performed with subjects making single-joint elbow flexion movements over different distances as fast as possible with their eyes closed to memorized targets. Standard deviation of movement trajectory increased during the first part of the movement and subsequently decreased. The variance peaked after the time of peak velocity, close to the time of peak deceleration. A dependence of the trajectory variance on movement distance (speed-accuracy trade-off) was seen during the movement (at times of peak velocity and peak deceleration) but not after the movement termination. We conclude that the previously reported drop in the variability of movement trajectory during the deceleration phase does not necessarily mean a compensation by the control system but may result from purely kinematic properties of the movement. The importance of the time of measurement for analysis of the speed-accuracy trade-offs is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199448
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  • 5
    Electronic Resource
    Electronic Resource
    Growth-rate-dependent bacteriochlorophyll c/d ratio in the antenna of Chlorobium limicola strain UdG6040 (1999)
    Springer
    Archives of microbiology 171 (1999), S. 350-354 
    Details
    ISSN: 1432-072X
    Keywords: Key words Bacteriochlorophyll ; Chlorobium limicola ; Chlorosomes ; Continuous culture ; Pigment synthesis ; S-adenosylmethionine methyltransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The green sulfur bacterium Chlorobium limicola UdG6040 exhibited a significant change in the spectral properties of its antenna when transferred from batch culture to a sulfide-limited chemostat. In steady-state continuous cultures, the in vivo absorption maximum of the culture changed to shorter wavelengths according to the dilution rate. The maximum difference observed was of 15 nm when cells were growing at 0.087 h–1. HPLC analyses revealed that the observed spectral change was caused by a partial enrichment of the original BChl c-containing antenna with BChl d molecules together with a change in the homolog composition of both pigments. The relative amount of BChl d reached a maximum value of 50% when cells were growing at 0.087 h–1. The content of BChl d decreased to less than the 22% when the dilution rate was diminished to 0.015 h–1. An unbalance of pigment synthesis at high dilution rates is suspected to be responsible of the changes observed in the antenna composition. Chlorosomes isolated from Chl. limicola UdG6040 growing at 0.070 h–1 contain organised pools of BChl c and BChl d in equal amounts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050721
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  • 6
    Electronic Resource
    Electronic Resource
    Environmental and physiological factors affecting the uptake of phosphate by Chlorobium limicola (1998)
    Springer
    Archives of microbiology 170 (1998), S. 252-258 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsChlorobium limicola ; Green sulfur bacteria ; Phosphate limitation ; Continuous culture ; Phosphate ; accumulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The uptake of soluble phosphate by the green sulfur bacterium Chlorobium limicola UdG6040 was studied in batch culture and in continuous cultures operating at dilution rates of 0.042 or 0.064 h–1. At higher dilution rates, washout occurred at phosphate concentrations below 7.1 μM. This concentration was reduced to 5.1 μM when lower dilution rates were used. The saturation constant for growth on phosphate (K μ) was between 2.8 and 3.7 μM. The specific rates of phosphate uptake in continuous culture were fitted to a hyperbolic saturation model and yielded a maximum rate (Va max) of 66 nmol P (mg protein)–1 h–1 and a saturation constant for transport (K t) of 1.6 μM. In batch cultures specific rates of phosphate uptake up to 144 nmol P (mg protein)–1 h–1 were measured. This indicates a difference between the potential transport of cells and the utilization of soluble phosphate for growth, which results in a significant change in the specific phosphorus content. The phosphorus accumulated within the cells ranged from 0.4 to 1.1 μmol P (mg protein)–1 depending on the growth conditions and the availability of external phosphate. Transport rates of phosphate increased in response to sudden increases in soluble phosphate, even in exponentially growing cultures. This is interpreted as an advantage that enables Chl. limicola to thrive in changing environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050640
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  • 7
    Electronic Resource
    Electronic Resource
    Radiology findings of amyloid arthropathy in long-term haemodialysis (1992)
    Springer
    European radiology 2 (1992), S. 305-309 
    Details
    ISSN: 1432-1084
    Keywords: Amyloid arthropathy ; Spondyloarthropathy ; Haemodialysis ; Hyperparathyroidism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Radiological features of cystic lesions due to beta-2-microglobulin-related amyloidosis have been studied in 88 patients recieving haemodialysis for more than 4 years. Amyloid arthropathy was confirmed by demonstration of amyloid-beta-2-microglobulin deposition on different substrates. Plain radiographs of shoulder, spine, pelvis, hands and knees revealed cystic lesions in 31 patients (35.2%), the distribution being: 71% shoulder, 56.7% carpal bones, 25.8% pelvis, 16.5% femur and 13.3% knees. Discitis was found in 34 patients (38.6%). The occurence of geodes was frequent in patients suffering from amyloid arthropathy (63% vs. 23%, P = 0.0001). No significant differences were found in the frequency of discitis or erosive arthropathy in the hands of both groups. The former was related to age and the latter to secondary hyperparathyroidism. We stress the radiographic appearance and the high incidence of these lesions in patients on long-term haemodialysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175432
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  • 8
    Electronic Resource
    Electronic Resource
    Pigmented photoallergic contact dermatitis from musk ambrette (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 24 (1991), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1991.tb01709.x
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  • 9
    Electronic Resource
    Electronic Resource
    Protein contact dermatitis caused by Anisakis simplex (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 37 (1997), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1997.tb02453.x
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  • 10
    Electronic Resource
    Electronic Resource
    Nutritionally triggered alterations in the regiospecificity of arachidonic acid oxygenation by rat liver microsomal cytochrome P450
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 274 (1989), S. 251-258 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(89)90437-2
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