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  • Polymer and Materials Science  (3)
  • Agenesis  (2)
  • Lidocaine block  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Radiologic anatomy of segmental agenesis of the internal carotid artery (1998)
    Springer
    Surgical and radiologic anatomy 19 (1998), S. 385-394 
    Details
    ISSN: 1279-8517
    Keywords: Internal carotid a. ; Agenesis ; Carotid canal ; Rete mirabile ; Anastomoses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report six cases of segmental agenesis of the internal carotid a. discovered in adult patients: one case of cervical segmental agenesis (no. 1), one case of cervical and petrosal segmental agenesis (no. 2), two cases of vertical cavernous segmental agenesis (nos. 3 and 4) and two cases of distal segmental agenesis, one unilateral (no. 5) and the other bilateral (no. 6). The collateral pathways observed were: the ascending pharyngeal a. which constitutes an “intratympanic course” of the internal carotid a. (no. 1), an intercarotid anastomosis (no. 2), an arterial network at the base of the skull, the so-called “rete mirabile” (nos. 3 and 4) and the posterior communicating a. (nos. 5 and 6). Recognition of these rare dysgeneses relies upon the following radio-anatomic characteristics: reduced caliber of the a., inconsistent sparing of the carotid body, reduced diameter or even absence of the carotid canal and above all, the presence of collateral pathways. The collateral pathways allow an understanding of the segmental nature of carotid a. development and a distinction between congenital and acquired stenoses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00276-997-0385-z
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  • 2
    Electronic Resource
    Electronic Resource
    Radiologic anatomy of segmental agenesis of the internal carotid artery (1997)
    Springer
    Surgical and radiologic anatomy 19 (1997), S. 385-394 
    Details
    ISSN: 1279-8517
    Keywords: Internal carotid a. ; Agenesis ; Carotid canal ; Rete mirabile ; Anastomoses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Six observations d'agénésies segmentaires de l'artère carotide interne, découvertes chez l'adulte, sont rapportées : un cas d'agénésie du segment cervical (no 1), un cas d'agénésie des segments cervical et pétreux (no 2), deux cas d'agénésie du segment caverneux vertical (no 3 et 4) et deux cas d'agénésie distale de l'artère, unilatérale (no 5) et bilatérale (no 6). Les voies de suppléance observées sont : l'artère pharyngienne ascendante réalisant un “trajet intratympanique” de l'artère carotide interne (no 1), une anastomose intercarotidienne (no 2), un réseau artériel de la base du crâne, dit “réseau admirable” (no 3 et 4) et l'artère communicante postérieure (no 5 et 6). La reconnaissance de ces rares dysgénésies repose sur les caractéristiques radio-anatomiques suivantes : réduction de calibre de l'artère, respect inconstant de sa portion bulbaire, réduction des dimensions voire absence du canal carotidien et surtout voies anastomotiques utilisées. Les anastomoses observées permettent en effet de comprendre le caractère segmentaire du développement de l'artère et de distinguer les sténoses congénitales et les sténoses acquises.
    Notes: Summary We report six cases of segmental agenesis of the internal carotid a. discovered in adult patients: one case of cervical segmental agenesis (no. 1), one case of cervical and petrosal segmental agenesis (no. 2), two cases of vertical cavernous segmental agenesis (nos. 3 and 4) and two cases of distal segmental agenesis, one unilateral (no. 5) and the other bilateral (no. 6). The collateral pathways observed were: the ascending pharyngeal a. which constitutes an “intratympanic course” of the internal carotid a. (no. 1), an intercarotid anastomosis (no. 2), an arterial network at the base of the skull, the so-called “rete mirabile” (nos. 3 and 4) and the posterior communicating a. (nos. 5 and 6). Recognition of these rare dysgeneses relies upon the following radio-anatomic characteristics: reduced caliber of the a., inconsistent sparing of the carotid body, reduced diameter or even absence of the carotid canal and above all, the presence of collateral pathways. The collateral pathways allow an understanding of the segmental nature of carotid a. development and a distinction between congenital and acquired stenoses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628506
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Brainstem mediation of prefrontal stimulus-produced hypotension (1990)
    Springer
    Experimental brain research 79 (1990), S. 393-399 
    Details
    ISSN: 1432-1106
    Keywords: Prefrontal cortex ; Nucleus tractus solitarius ; Cardiovascular ; Hypotension ; Lidocaine block ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electrical stimulation of the prefrontal cortex (PFC) in rats produces transient hypotension. It has been suggested that this stimulus-produced hypotension (SPH) may be mediated by direct PFC projections to either the posterolateral hypothalamus or the nucleus tractus solitarius (NTS). To initially test these hypotheses, microinjections (0.5 μl) of 4% lidocaine were made into various brainstem sites, including the posterolateral hypothalamus, the PFC-NTS pathway and the NTS itself. Most injections made into the posterolateral hypothalamus, rostral portion of the PFC-NTS pathway or NTS were successful in blocking prefrontal SPH. In comparison, the majority of injections made into numerous other brainstem sites including the caudal portion of the PFC-NTS pathway did not block prefrontal SPH. These findings support the concept that prefrontal SPH maybe mediated via both the posterolateral hypothalamus and NTS. However, these findings do not support the hypothesis that prefrontal SPH is mediated by direct projections from the PFC to the NTS. To eliminate the possibility that the effects of the lidocaine injections made into the hypothalamus were due to the incapacitation of fibers alone, a series of experiments was conducted in which microinjections (0.5 μl) of ibotenic acid, a neurotoxin that destroys perikarya but spares axons, were made into the posterolateral hypothalamus. Each of these injections resulted in the blockade of prefrontal SPH. These findings further support the role of hypothalamic involvement in prefrontal SPH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608250
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  • 4
    Electronic Resource
    Electronic Resource
    Additive selection criteria for metal-doped polyimides (1987)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 25 (1987), S. 471-475 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1987.140251201
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  • 5
    Electronic Resource
    Electronic Resource
    Photochemistry and photopolymerization activity of perester derivatives of benzophenone (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 1169-1178 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The spectroscopic properties and photopolymerization activities of a mono- and tetraperester derivative of benzophenone are examined and compared with those of benzophenone. Their photopolymerization activity in methyl methacrylate (MMA) and an ethoxylated bis-phenol-A diacrylate have been studied using a combination of gel permeation chromatography (GPC), and real time Fourier transform infrared spectroscopy (RTFTIR) as well as the commercial pendulum hardness test. Using GPC analysis on the poly(methyl methacrylate) samples the tetra--t-butyl perester derivative of benzophenone is found to give a higher weight average (Mw) and number average (Mn) molecular weight polymer than that produced using the mono perester. For the two peresters of benzophenone photopolymerization efficiency using real time FTIR increases with increasing initiator concentration, and no self-termination is observed up to 0.75% w/w concentration with the mono perester derivative being the more efficient initiator. Similar results were obtained using the commercial pendulum hardness tester with a triacrylate/epoxyurethane acrylate resin with benzophenone exhibiting the lowest activity. Photopolymerization activities of the initiators correlate well with their spectroscopic properties. The phosphorescence quantum yield is higher for the monoperester than the tetraperester derivative and is consistent with a shorter lifetime and lower photolysis quantum yields in 2-propanol. Compared with benzophenone, phosphorescence analysis indicates that the perester groups impart a degree of charge-transfer content to the molecule which is consistent with the degree of substitution. Ketyl radical formation on microsecond flash photolysis follows the order benzophenone 〉 mono- 〉 tetraperester derivative and is consistent with the phosphorescence quantum yields. On nanosecond laser flash photolysis in nitrogen-saturated acetonitrile, triplettriplet absorption is extremely weak for both the perester derivatives, being stronger for the monoperester.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420501
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of synthetic fabrics as artificial skin grafts to experimental burn woundsThis investigation was supported by Artificial Heart Grant NHI-HE09252. (1969)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 3 (1969), S. 213-234 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: After utilizing the nylon velour Silastic and polypeptide laminates in this experimental pilot study, we can conclude the following: 1Both nylon velour Silastic and polypeptide laminates are well tolerated in the clean wound and serve as a satisfactory framework into which fibroblastic proliferation can occur resulting in adherence or take.2In contaminated wounds, infection resulted in exudation with an accumulation of fluid at the interface of granulation tissue and velour. The exudate, not resorbed and unable to transcend the laminate barrier completely, serves as a nidus of progressive bacterial growth and causes separation and rejection of this synthetic fabric cover. The fluid accumulation appeared more common utilizing the Silastic laminate, while the polypeptide laminate appeared to permit an escape of this exudate to inhibit or delay the separation.3The Silastic laminated velour became firm and inflexible, predisposing with motion, to a mechanical type of separation at the margin of fabric and normal skin, possibly a contributing factor in exogeneous infection. This was seen also with the polypeptide laminate, but to a much lesser degree.4The nylon velour Silastic laminate as it is presently constructed is not acceptable as a synthetic skin cover for an infected burn wound, while the polypeptide laminated velour appears to possess physical properties which make it suitable for further investigation as an artificial skin substitute.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820030203
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