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  • 1
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Molecular studies have shown microdeletions in region q11 of chromosome 22 in nearly all patients with DiGeorge, velocardiofacial and conotruncal anomaly face syndromes (DGS, VCFS and CTAFS, respectively) and in a high percentage of non-syndromic familial cases of conotruncal defects (CTD). CTD account for roughly a fourth to a third of all non-syndromic congenital heart defects (CHD), thus, 22q11 could harbor a major genetic factor of CHD. We searched for a 22q11 microdeletion in familial cases of non-syndromic CTD. Thirty-six cases of various isolated CTD, that is without history of hypocalcemia, immune deficiency, absent thymus, and dysmorphic appearance, were selected. With 48178, a cosmid probe localized in the smallest deleted region of the DiGeorge critical region (DGCR), we found no deletions by fluorescence in situ hybridization in these 36 affected individuals of 16 families with recurrent CTD. Moreover, D22S264, a microsatellilte localized at the distal part of the largest deleted region, was used to genotype the patients. Thirty-two patients out of 37 were heterozygous and hence not deleted at this locus, whereas 5 were uninformative. In conclusion, there are no large deletions in familial cases of various CTD, whether these defects are identical or not within a family. This result does not rule out other minor anomalies in this chromosomal region.
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  • 3
    ISSN: 1433-0350
    Keywords: Arteriovenous fistula, cerebral ; Doppler studies ; Hydrocephalus ; Interventional neuroradiology, infant ; Magnetic resonance angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report the radiological features, including Doppler sonography and magnetic resonance angiography (MRA) findings, of a nongalenic arteriovenous fistula diagnosed in the neonatal period. Hypertensive hydrocephalus developed in infancy. Emergent percutaneous transarterial embolization with n-butyl-2-cyano-acrylate was successfully performed and lead to clinical improvement. MRA allowed a noninvasive followup.
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  • 4
    ISSN: 1279-8517
    Keywords: Left brachiocephalic vein Ultrasonography Tetralogy of Fallot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A left retro-aortic brachiocephalic vein is a rare anatomic entity. A retrospective study was made of 5218 congenital cardiopathies treated between 1982 and 1998 in a medico-surgical department of paediatric cardiology. A left retro-aortic brachiocephalic vein was demonstrated in 27 patients, i.e. an incidence of 0.5%. The chief cardiopathy in these patients was a tetralogy of Fallot in 25 cases (93%). Among these 25 cases of Fallot’s tetralogy the aortic arch was rightsided in 19 cases (70%). The paraclinical diagnosis of this anomaly was facilitated by ultrasonography, provided it was sought for. In this series 6 cases (22%) were discovered during surgery without previous ultrasound diagnosis. The embryological origin of the left retro-aortic brachiocephalic v. differs from that of the venous trunk in its classical anatomic form. It derives from the inferior (but not superior) transverse plexuses, connecting the two anterior cardinal veins. One of the main consequences of this anomaly is its possible confusion with other vascular structures, particularly the right pulmonary artery. Such confusion may give rise to inappropriate surgical procedures. The differential diagnosis is facilitated by the use of the Doppler the venous flow is biphasic and regulated by respiration, whereas the Doppler recording from a pulmonary artery is that of a characteristic systolic arterial flow.
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  • 5
    ISSN: 1279-8517
    Keywords: Left brachiocephalic vein ; Ultrasonography ; Tetralogy of Fallot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La veine brachiocéphalique gauche rétro-aortique est une entité anatomique rare. Une analyse rétrospective a été réalisée sur 5 218 cardiopathies congénitales traitées entre 1982 et 1998 dans un département médico-chirurgical de cardiologie pédiatrique. Une veine brachiocéphalique gauche rétro-aortique a été mis en évidence chez 27 patients soit une incidence de 0,5 %. La cardiopathie principale était une tétralogie de Fallot dans 25 cas (93 %). Parmi ces 25 cas de tétralogie de Fallot, l'arc aortique était droit dans 19 cas (70 %). Le diagnostic paraclinique de cette anomalie est aisé par échocardiographie à condition de la rechercher. Dans cette série, 6 cas (22 %) ont été découverts pendant la chirurgie sans diagnostic échographique préalable. L'origine embryologique de la veine brachiocéphalique gauche rétro-aortique est différente de celle de la v. brachiocéphalique dans sa forme anatomique classique. Elle provient des plexus transverses inférieurs (et non supérieurs) mettant en communication les deux veines cardinales antérieures. Une des principales conséquences cliniques de cette anomalie est la confusion possible avec d'autres structures vasculaires en particulier l'a. pulmonaire droite. Une telle confusion peut être à l'origine d'indications chirurgicales non appropriées. Le diagnostic différentiel est facilité par l'utilisation du Doppler : le flux veineux est biphasique et rythmé par la respiration alors que l'enregistrement Doppler d'une a. pulmonaire donne un flux artériel systolique caractéristique.
    Notes: Summary A left retro-aortic brachiocephalic vein is a rare anatomic entity. A retrospective study was made of 5218 congenital cardiopathies treated between 1982 and 1998 in a medico-surgical department of paediatric cardiology. A left retro-aortic brachiocephalic vein was demonstrated in 27 patients, i.e. an incidence of 0.5%. The chief cardiopathy in these patients was a tetralogy of Fallot in 25 cases (93%). Among these 25 cases of Fallot's tetralogy the aortic arch was rightsided in 19 cases (70%). The paraclinical diagnosis of this anomaly was facilitated by ultrasonography, provided it was sought for. In this series 6 cases (22%) were discovered during surgery without previous ultrasound diagnosis. The embryological origin of the left retro-aortic brachiocephalic v. differs from that of the venous trunk in its classical anatomic form. It derives from the inferior (but not superior) transverse plexuses, connecting the two anterior cardinal veins. One of the main consequences of this anomaly is its possible confusion with other vascular structures, particularly the right pulmonary artery. Such confusion may give rise to inappropriate surgical procedures. The differential diagnosis is facilitated by the use of the Doppler: the venous flow is biphasic and regulated by respiration, whereas the Doppler recording from a pulmonary artery is that of a characteristic systolic arterial flow.
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  • 6
    ISSN: 1279-8517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusion La position anormale rétro-aortique de la VBCG est une anomalie rare. Cette anomalie est le plus souvent retrouvée chez les patients porteurs d'une tétralogie de Fallot. Bien que cette malformation n'ait pas de répercussion physiopathologique en ellemême, sa recherche échographique doit être systématique. L'enregistrement Doppler permet d'éviter toute confusion avec d'autres structres vasculaires en particulier l'a. pulmonaire droite.
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  • 7
    ISSN: 0392-6737
    Keywords: Stimulated Raman scattering and spectra ; CARS ; Liquids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The issue of the relations that multiresonance CARS spectra and excitation profiles (CEP) bear to the corresponding spontaneous resonance Raman scattering (RRS) counterparts is addressed in the present paper with particular reference to the case of chromophoric molecules in room temperature solutions. On the basis of a fifth-order calculation of the CARS susceptibility, it is predicted that the properties of multiresonance CARS spectra and CEP strongly depend on the excited-state dynamics and pure dephasing rates. New experimental CARS and CEP results are reported for β-carotene and are shown to be closely related to the corresponding RRS data. This is attributed to the fact that its very fast excited-state dynamics allows one to use a simple third-order description of the data.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 13-19 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The resonance Raman scattering spectra of a Peierls–Hubbard dimer with explicit inclusion of electron coupling to both intramolecular vibration and intermolecular phonon modes are discussed theoretically and investigated experimentally. When the exciting wavelength is in resonance with the charge transfer band of a symmetric dimer the intermolecular phonon modes which modulate the transfer integral are selectively enhanced through both Albrecht's A and C mechanisms. No enhancement occurs for the intramolecular modes. This prediction is strikingly demonstrated by reporting the low temperature resonance Raman spectra of crystalline (TTF)Br (TTF=tetrathiafulvalene) whose structure consists of almost isolated (TTF+)2 dimers. Fourteen bands are observed at low frequencies whereas the intramolecular mode region is silent. The observed bands are tentatively assigned to intermolecular modes in which the TTF+ cations in a dimer translate antiphase and to one low frequency out-of-plane molecular vibration. It is argued that a detailed study of the resonance enhancement mechanism may provide information on the electron correlation in a Peierls–Hubbard dimer.
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  • 9
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 1225-1229 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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