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  • Electronic Resource  (20)
  • 1980-1984  (5)
  • 1975-1979  (15)
  • 1
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 103 (1980), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this investigation was to establish a standardized animal model to predict the photoallergenic potential of new chemical compounds. In a first series of experiments the main factors influencing the induction of photoallergenicity were evaluated (induction concentration, pH of the test solution, pretreatment of the irradiation site with sodium lauryl sulphate, additional use of adjuvant injections and routes of administration). Osram Ultravitalux lamps were utilized for these studies.In a second series of experiments a Xenon 6000 W radiation source was used. Positive results were obtained with well known photosensitizers, as, for instance, the halogenated salicylanilides, as well as with so-called weak photoallergens (e.g. bithionol, sulphanilamide) by stimulating the animals' immune system with Freund's complete adjuvant.The photoallergenic compounds were at the same time tested for their contact allergenic potential in the optimization test.A standard procedure for the predictive photoallergenicity assay in guinea-pigs is proposed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 6 (1980), S. 0 
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 6-Methylcoumarin was tested in a new animal model developed for the predictive evaluation of photocontact allergenic potential. Negative results were obtained and these are discussed with respect to inherent limitations of the animal model.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 5 (1979), S. 0 
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Results of the optimization method and of other methods used to assess contact allergy in laboratory animals were compared with known epidemiological data on the occurrence of hypersensitivity reactions in man. Tests were performed with preservatives {formalin, ethylenediamine and sorbic acid), drugs (penicillin G, benzocaine and sulphathiazole) and other contactants belonging to widely different chemical classes (p-phenylenediamine, triclosan, pyrazole derivatives, nickel and chrome salts, eugenol, isoeugenol and mercaptobenzothiazole). The degree of sensitization achieved in guinea pigs by the optimized procedure (intradermal test with adjuvant combination) and the maximization procedure was invariably superior to that produced by the epidermal method using prior irritation of the site of application. Both the optimized procedure and the maximization test seem to be capable of identifying contact allergens that cause hypersensitivity reactions in as few as t in 10,000 of the human population as a whole. The optimization test merits consideration as a standardized and efficiently predictive procedure.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Groups of guinea pigs were sensitized with a 0.1% solution of dinitrochlorobenzene (DNCB) by the Draize intracutaneous method, The course of the induction process, the influence of the vehicles used and the extent to which the reactions are amenable to assessment according to objective criteria were examined. The sensitivity of the standardized Draize test was then compared with that of various other sensitization techniques, including:The intracutaneous test with adjuvant (optimization test)The maximization test according to Magnusson & Kligman (1969)The epidermal sensitization testThe epidermal sensitization lest wish prior irritation of the contact site (by croton oil or sodium lauryl sulphate).Comparison of these methods revealed that either the additional application of adjuvant or prior irritation of the contact site augmented the degree of sensitization to DNCR just as greatly as the simultaneous use of adjuvant and prior irritation of the skin, (maximization test.). The improved sensitization methods, and in particular the standardised optimization test, may prove to be of particular value for the study of so-called weak allergens.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2013
    Keywords: Contrast sensitivity ; Spatial distortion ; Neural dysfunction ; Amblyopia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this investigation contrast threshold measurements are compared with supra-threshold perception for a group of human amblyopes. The results indicate that human amblyopia involves, in some cases, not only loss of sensitivity but spatial distortion. Thus a new group of amblyopes can now be identified in which only distortion occurs. These results have important physiological implications for both the normal and abnormal visual systems. Neurophysiologists investigating visual loss from deprivation should assess whether similar distortions occur in animals. This question may hold the answer to whether the present animal models are relevant to the human condition.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1077-1079 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The microfluorimetrical investigation showed that in the principal perikarya of the rat superior cervical ganglion, after inhibition of noradrenaline-synthesis and unilateral preganglionic axotomy, the fluorescence of newly synthesized noradrenaline was most intense at the periphery of the perikarya of the intact side.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Inflammation research 14 (1984), S. 131-138 
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Subchronic testing of laboratory animals in accordance with present regulatory guidelines involves maximum exposure with the chemical under investigation and serves for the evaluation of systemic toxicity as well as of lesions in organs and organ systems, including neurotoxicity. The primary assessment of neurotoxicity is essentially based on the overall observation of animal behaviour in the course of the customary toxicity studies and on the subsequent neuropathological evaluation with contemporary techniques. Under this maximum exposure the absence of symptoms and signs of neural abnormalities indicates that the material testd would be devoid of neurotoxicity. Any overt or suspicious symptoms for neurotoxicity appearing in the course of subchronic testing may be further characterized with additional functional tests such as neurological examination, electrodiagnostics and possibly with specific behavioural tests. The subsequent neuropathological investigation would have to be expanded to include a detailed evaluation of all neural structures possibly related with the above functional derangements. In case of relevant neurotoxicity subsequent specific behavioural tests might include the evaluation of complex neural functions such as integrated psycho-neuro-motor activity and memory. These behavioural tests might help to explain neurotoxicity and to assess behaviour at low levels of exposure. The implementation of such specific behavioural testing procedures beyond the scope of routine toxicity studies would require a group of investigators capable to earry out appropriate tests. The introduction of such testing will therefore have to be evaluated competitively regarding costs versus the advantages offered by the refinement of the other testing procedures for neurotoxicity including the neuropathological techniques. The performance of behavioural tests without preceding or concomitant toxicological evaluation is not considered to be a feasible approach.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Guinea-pigs were sensitized with various substances (DNCB, penicillin G, PPL, ethylaminobenzoate, formalin) by the Draize method, the maximization method and the new optimization method (intracutaneous test employing adjuvant). The advantages of the optimization method favouring its adoption as a standard sensitization test are discussed in the light of the results obtained by this method and with the two established tests.
    Type of Medium: Electronic Resource
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