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  • General Chemistry  (15)
  • Myoelectric control  (6)
  • Myoelectric  (3)
  • X-ray absorption spectroscopy  (3)
  • 1
    Electronic Resource
    Electronic Resource
    X-ray absorption spectroscopic analysis of Fe(II) and Cu(II) forms of a herbicide-degrading α-ketoglutarate dioxygenase (1999)
    Springer
    JBIC 4 (1999), S. 122-129 
    Details
    ISSN: 1432-1327
    Keywords: Key words α-Ketoglutarate dioxygenase ; TfdA ; X-ray absorption spectroscopy ; Extended X-ray absorption fine structure ; 2 ; 4-Dichlorophenoxyacetic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract  The first step in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) by Ralstonia eutropha JMP134 is catalyzed by the α-ketoglutarate (α-KG)-dependent dioxygenase TfdA. Previously, EPR and ESEEM studies on inactive Cu(II)-substituted TfdA suggested a mixture of nitrogen/oxygen coordination with two imidazole-like ligands. Differences between the spectra for Cu TfdA and α-KG- and 2,4-D-treated samples were interpreted as a rearrangement of the g–tensor principal axis system. Herein, we report the use of X-ray absorption spectroscopy (XAS) to further characterize the metal coordination environment of Cu TfdA as well as that in the active, wild-type Fe(II) enzyme. The EXAFS data are interpreted in terms of four N/O ligands (two imidazole-like) in the Cu TfdA sample and six N/O ligands (one or two imidazole-like) in the Fe TfdA sample. Addition of α-KG results in no significant structural change in coordination for Cu or Fe TfdA. However, addition of 2,4-D results in a decrease in the number of imidazole ligands in both Cu and Fe TfdA. Since this change is seen both in the Fe and Cu EXAFS, loss of one histidine ligand upon 2,4-D addition best describes the phenomenon. These XAS data clearly demonstrate that changes occur in the atomic environment of the metallocenter upon substrate binding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007750050295
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  • 2
    Electronic Resource
    Electronic Resource
    Structural evidence for a common zinc binding domain in archaeal and eukaryal transcription factor IIB proteins (2000)
    Springer
    JBIC 5 (2000), S. 276-283 
    Details
    ISSN: 1432-1327
    Keywords: Key words Transcription factor IIB ; Metalloprotein ; Zinc finger ; Gene transcription ; X-ray absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract X-ray absorption spectroscopy has been used to compare the metal coordination of the N-terminal zinc binding domain of eukaryal human transcription factor (TF) IIB to the previously reported structure of archaeal Pyrococcus furiosus (Pf) TFB. Full length and N-terminal fragments for both PfTFBand human TFIIB were cloned, expressed, and purified. The [C10H] variant of PfTFB was constructed to resemble the metal binding motif of higher eukaryal TFIIB proteins by mutating the second cysteine ligand to a histidine. All five proteins bind zinc in a 1 :1 ratio. Zn X-ray absorption spectroscopy of human TFIIB and [C10H]PfTFB mutant are consistent with ZnS3(N,O) ligation, and further suggest that the N/O ligand is an imidazole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007750050372
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  • 3
    Electronic Resource
    Electronic Resource
    A transcription factor IIB homolog from the hyperthermophilic archaeon Pyrococcus furiosus binds Zn or Fe in an N-terminal Cys4 motif (1996)
    Springer
    JBIC 1 (1996), S. 162-168 
    Details
    ISSN: 1432-1327
    Keywords: Key words TFIIB ; Metalloprotein ; Zinc finger ; Gene transcription ; X-ray absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract  The gene for an archaeal homolog of the eukaryotic transcription factor TFIIB has been cloned from the marine hyperthermophilic archaeon Pyrococcus furiosus and overexpressed in Escherichia coli. This TFB gene displays a sequence that is identical to a gene sequence in P. woesei. A gene for the 49-residue N-terminal domain of TFB that contains a putative C-X2-C-X15-C-X2-C metal-binding motif was subcloned and overexpressed as TFB-NTD. Purification of the TFB-NTD gene product yields Zn- and Fe-containing forms, which have been characterized by mass spectrometry and UV-visible, electron paramagnetic resonance, and X-ray absorption (XAS) spectroscopies. Only the Zn form of the TFB holoprotein has been (partially) purified, and it has been characterized by XAS. All spectroscopic characteristics are consistent with a nearly tetrahedral MS4 metal-binding site made up of the four cysteine residues in the N-terminal domain. The relatively greater thermal stability of the Zn form suggests that TFB may be a Zn-containing protein involved in archaeal transcription.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007750050035
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  • 4
    Electronic Resource
    Electronic Resource
    Operator error in multistate myoelectric control systems (1978)
    Springer
    Medical & biological engineering & computing 16 (1978), S. 296-301 
    Details
    ISSN: 1741-0444
    Keywords: Error analysis ; Myoelectric control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Un système de commandes myoélectriques est celui, où le fonctionnement d'un dispositif est contrôlé par le potentiel électrique produit par la contraction volontaire d'un muscle. Ces systèmes sont surtout employés pour la commande de membres artificiels. Les premiers types de systèmes de commande était empiriques, mais de récents travaux ont produit des bases théoriques, pouvant prédire leur performance. Ceci devrait pouvoir améliorer les systèmes déjà existants, et rendre possible le développement de prothèses plus complexes.
    Abstract: Zusammenfassung Bei einem myoelektrischen Steuersystem wird der Betrieb eines Geräts durch ein elektrisches Potential gesteuert, das durch freiillige Kontraktion eines Muskels erzeugt wird. Diese Systeme wurden hauptsächlich zur Kontrolle künstlicher Glieder verwendet. Frühere Entwürfe des Steuersystems waren empirisch, jedoch wurden kürzlich einige theoretische Grundlagen erarbeitet, die ihre Leistung vorbestimmen können. Dieses wird zur Verbesserung der bestehenden Systeme führen und die Entwicklung mehr komplexer Prothesen wahrscheinlicher machen.
    Notes: Abstract A myoelectric control system is one in which the operation of a device is controlled by the electric potential produced by voluntary contraction of a muscle. These systems have been used mainly for the control of artificial limbs. Early design of the control systems was empirical, but recent work has provided some theoretical basis for predicting their performance. This should lead to improvements in existing systems and make feasible the development of more complex prostheses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442431
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  • 5
    Electronic Resource
    Electronic Resource
    Sensory-feedback system compatible with myoelectric control (1980)
    Springer
    Medical & biological engineering & computing 18 (1980), S. 65-69 
    Details
    ISSN: 1741-0444
    Keywords: Electrocutaneous stimulation ; Myoelectric control ; Prosthetics ; Sensory feedback
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Progress in the development of a system to provide sensory feedback of the pinch force of an artificial hand is described. Design criteria relating to electrocutaneous stimulation and compatibility with myoelectric control are discussed. Details of a practical system, presently in use by two amputees prior to full-scale clinical evaluation, are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442481
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  • 6
    Electronic Resource
    Electronic Resource
    A biphasic pulse burst generator for afferent nerve stimulation (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 77-80 
    Details
    ISSN: 1741-0444
    Keywords: Myoelectric control ; Nerve stimulator ; Pulse burst ; Sensory feedback
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442825
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  • 7
    Electronic Resource
    Electronic Resource
    Control performance characteristics of myoelectric signal with additive interference (1991)
    Springer
    Medical & biological engineering & computing 29 (1991), S. 84-88 
    Details
    ISSN: 1741-0444
    Keywords: Control ; Interference ; Myoelectric ; Performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Myoelectric signal is an important source of control information for powered prostheses. A commonly used performance measure for the signal processors of such control systems is the ratio of processor output mean to variance. This ratio (SNR) is a function of a number of factors including physiological parameters and additive interference. The paper investigates the effects of motor unit physiological parameters and interference on control performance, with particular reference to SNR. Performance equations are derived and verified within vivo experiments. The results show a complex interaction among the physiological parameters and interference. A particular point of interest is the misleading SNR values that can occur under certain recruitment and interference conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446301
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  • 8
    Electronic Resource
    Electronic Resource
    Battery saving circuit for children's prostheses (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 251-252 
    Details
    ISSN: 1741-0444
    Keywords: Batteries ; Myoelectric ; Prothesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441365
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  • 9
    Electronic Resource
    Electronic Resource
    Improved battery saving device for use with myoelectric control systems (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 203-205 
    Details
    ISSN: 1741-0444
    Keywords: Myoelectric control ; Battery saving device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443938
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  • 10
    Electronic Resource
    Electronic Resource
    Amplifier input impedances for myoelectric control (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 527-530 
    Details
    ISSN: 1741-0444
    Keywords: Differential amplifiers ; Input impedance ; Myoelectric control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Normal requirements for differential and common-mode input impedance of amplifiers for biological signals are reviewed. It is shown that these are not sufficient for satisfactory performance of amplifiers in myoelectric control applications, where accidental opening of the input circuit through electrode movement must not make the system susceptible to external noise. The additional constraint imposed by this application is examined, and a circuit is presented illustrating its practical resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443970
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