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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science, Ltd
    International journal of cosmetic science 23 (2001), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Synopsis The aim of this work was to evaluate the synergy between different lightening agents when associated; depigmenting activity was tested in vitro by monitoring the appearance of dopachrome, an intermediate in the melanogenesis process. The results obtained were compared with the depigmenting activity of each single compound, keeping the same global concentration of inhibitor.Our studies showed that the combination of hydroquinone and kojic acid had a synergistic effect, and that the maximum inhibiting action was achieved with an equimolecular mixture. This result could serve in the cosmetics field to prepare skin-lightening formulations that are less irritant.We also investigated the feasibility of complexing hydroquinone with cyclodextrin and evaluated the effectiveness of the complex obtained in the treatment of hyperpigmentation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 56 (1987), S. 111-120 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract An original method is presented for the single sweep analysis of visual evoked potentials (VEP's). The introduced algorithm bases upon an AutoRegressive with eXogenous input (ARX) modelling. A Least Squares procedure estimates the coefficients of the model and allows to obtain a complete black-box description of the signal generation mechanism, besides providing a filtered version of the single sweep potential. The performance of the algorithm is verified on proper simulation tests and the experimental results put into evidence the noticeable improvement of signal-to-noise ratio with a consequent better recognition of the classical parameters of the peaks (latencies and amplitudes). The possibility of measuring these parameters on a single sweep basis enables to evaluate the dynamics of the Central Nervous System response during the entire course of the examination. A classification of the estimated evoked potentials in a small number of subsets, on the basis of their morphology, is also possible.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1106
    Keywords: Prehension ; Grasp ; Transport ; Proprioception ; Deafferented human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study we investigated the role of proprioception in the control of prehension movements, with particular reference to the grasp component. Grasp and transport kinematics were studied in a peripherally deafferented patient and in five healthy subjects. Two experiments were carried out: the prehension experiment and the grasp perturbation experiment. In the prehension experiment both the patient and the control subjects were required to reach and grasp three objects of different size, located at three different distances, both with and without visual feedback. In the grasp perturbation experiment a mechanical perturbation was applied to the fingers during prehension movements, again executed with and without visual feedback. In the prehension experiment temporal parameters of the patient's movements were generally slowed, with greater variability on some measures. However, over the first phase of the movement the pattern of the patient's hand opening and transport acceleration, scaled to object size and distance, was the same as that of controls, both with and without visual feedback. On the contrary, during the final phase of the movement (the finger closure phase and deceleration) the patient's performance differed significantly from the controls. These phases were abnormally lengthened and frequent movement adjustments were observed. In the grasp perturbation experiment the patient was not able to compensate for the perturbations applied to the fingers, even with visual feedback. The data allowed us to investigate also the respective contribution of proprioception and of vision of the hand in the control of prehension. We compared prehension kinematics in two conditions: (a) with visual but no proprioceptive feedback (in the patient) and (b) with proprioceptive but no visual feedback (in the controls). In both experiments proprioceptive control was more efficient than visual control. The results of this study are interpreted in favour of the strict dependence of prehension control on proprioception. The first phase of the movement, however, can be appropriately planned and executed without the necessity of either proprioceptive or visual information about the hand.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1590-3478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 19 (1998), S. 81-85 
    ISSN: 1590-3478
    Keywords: Lyme disease ; Peripheral neuropathy ; Sciatic nerve ; Nerve biopsy ; Vasculitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Lyme disease is an infectious disease caused by the spirocheteBorrelia burgdorferi. The course of the disease is divided into three stages, the second of which may include various types of peripheral nervous system disturbances. We report the case of a patient with persistent deficits caused by the prevalent involvement of the sciatic nerve, confirmed by electrophysiological and neuropathological findings. The most significant bioptic results were axonal degeneration and perivascular inflammation. Damage to a single peripheral nerve as the dominant clinical expression during the course of Lyme disease is an unusual finding that has been rarely described in the literature.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 10 (1989), S. 221-221 
    ISSN: 1590-3478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1590-3478
    Keywords: migrant sensory neuritis ; sensory neuropathy ; AIDS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario La “Neurite Sensitiva Migrante di Wartenberg” è una rara sindrome caratterizzata dal coinvolgimento successivo e transitorio di diversi tronchi nervosi sensitivi. Descriviamo il caso di una giovane donna affetta da AIDS che ha presentato un quadro clinico compatibile con questa neuropatia sensitiva. Tra le diverse sindromi neurologiche associate ad AIDS segnaliamo la possibilità di osservare anche la Neurite Sensitiva Migrante.
    Notes: Abstract We studied an AIDS patient who suffered from numbness, paresthesias and pain in the territories of different non-contiguous cutaneous nerves at different times. A transitory partial loss of touch and pinprick sensibility was also present in the same cutaneous areas. Sensory conduction velocities and SAP amplitudes were normal. The clinical picture was consistent with the Migrant Sensory Neuritis of Wartenberg. This rare neuropathy has never previously been described in patients affected by AIDS.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 9 (1988), S. 173-174 
    ISSN: 1590-3478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 8 (1987), S. 171-175 
    ISSN: 1590-3478
    Keywords: Systemic vasculitis ; polyneuropathy ; collagen disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario A seguito di una revisione dei casi di vasculite sistemica seguiti nel corso di un anno presso un reparto di Reumatologia, sono stati individuati 18 pazienti con caratteri clinici ed elettrofisiologici di polineuropatia distale simmetrica. Un rallentamento della velocità di conduzione motoria era presente in 7 pazienti, mentre segni EM Grafici di denervazione nei muscoli distali degli arti inferiori erano presenti in tutti i casi, tranne uno. Il potenziale d’azione sensitivo (SAP) del nervo surale era assente bilateralmente in un caso, e di ampiezza ridotta in 14 su 16 pazienti esaminati, con ridotta velocità di conduzione in 9 casi. La biopsia del nervo sulrale, eseguita in 6 pazienti, mostrava prevalenti aspetti di tipo assonopatico. Questo studio documenta gli aspetti di compromissione diffusa del sistema nervoso periferico in corso di vasculite sistemica: dal punto di vista elettrofisiologico, l’alterazione di ampiezza del SAP rappresenta il reperto più comune assieme agli aspetti di denervazione, mentre le velocità di conduzione appaiono relativamente risparmiate.
    Notes: Abstract A review of case of systemic vasculitis followed for one year in a rheumatology depertment resulted in the detection of 18 patients who on the clinical and electrophysiological evidence had symmetrical distal polyneuropathy. A moderate impairment of the motor conduction velocity was present in 7 patients, with electromyographic neurogenic changes in the distal lower limbs of all but one patient. The sensory action potential of the sural nerve was bilaterally absent in one case, and its amplitude was reduced in 14 out of 16 patients, with a decreased sensory conduction velocity in 9 cases. The sural nerve biopsy, performed in 6 patients, was prevalently suggestive of previous axonal degeneration. This investigation illustrates the spectrum of diffuse peripheral nerve involvement associated with systemic vasculitis. A variable impairment of the sensory action potential, ranging from slight decrease of amplitude to no response, is the most common finding. Conduction velocities appear to be relatively spared.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 7 (1986), S. 93-96 
    ISSN: 1590-3478
    Keywords: Carpal tunnel syndrome ; median nerve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Sono stati esaminati 56 pazienti con Sindrome Tunnel Carpale (CTS), per un totale di 84 mani. Ciascun paziente è stato valutato clinicamente ed elettromiograficamente. L'esame clinico mirava ad evidenziare la presenza di deficit sensitivi e motori e rilevare la presenza di altre patologie. Lo scopo del nostro studio è stato quello di valutare l'esistenza di una correlazione tra sintomi e/o segni clinici e dati elettromiografici. È stata rilevata una correlazione particolarmente significantiva tra deficit sensitivo (ipoestesia tattile e/o dolorifica) e ampiezza del SAP e inoltre tra la comparsa di deficit motori (ipostenia) e/o atrofia e la latenza distale motoria.
    Notes: Abstract 56 patients with carpal tunnel syndrome (CTS) with 84 hands affected were investigated. All patients were assessed clinically and electromyographically in order to find out whether there is a correlation between clinical signs and/or symptoms and the EMG data. A highly significant correlation was found between sensory deficit (hypoesthesia to touch and/or pain) and the amplitude of SAP and a significant correlation between motor deficits (weakness and/or atrophy) and distal motor latency.
    Type of Medium: Electronic Resource
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