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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1648-1653 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The upconversion of infrared radiation to shorter wavelengths by Er3+ ions in heavy-metal fluoride glasses, some doped with Yb3+, has been studied over a wide intensity range and for various excitation wavelengths. The upconversion efficiency measured at room temperature varies linearly or quadratically with intensity and saturates at 100 W/cm2 or higher, depending on emission wavelength. For 4 mol % ErF3 in BaF2/ThF4, the 4I11/2 to 4I15/2 transition is over 10% efficient for 400 W/cm2 of absorbed 1.5-μm power, i.e., for 4I15/2 to 4I13/2 excitation. A rate equation model and Judd–Ofelt analysis of data for the glasses doped with just Er3+ provide an understanding of the upconversion process while yielding values for Er3+ energy-transfer rates and excited-state populations. These results could be used to develop glasses for lasing and as infrared optical detectors.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Inorganic chemistry 27 (1988), S. 4018-4021 
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 650 (1992), S. 0 
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 2091-2093 
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 20 (2003), S. 129-130 
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The T = 1 admixture into the T = 0 member of a recently discovered $J^\pi = 4^{ + }$ isospin-doublet in 54Co is obtained from the measured electromagnetic E2/M1 multipole mixing ratio, $\delta = 0.12(4)$ of the $T = 0, 4^{ + } \rightarrow T = 0, 3^{ + }$ transition. Combining these data with shell model calculations for strong isovector M1 and isoscalar E2 electromagnetic matrix elements one obtains a value for the T = 1 admixture into the T = 0, 4 + state of $0.23_{-0.10}^{ + 0.29}\%$ . The corresponding mixing matrix element in the 4 + doublet is $V_{\rm mix} = 10$ keV.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    International journal of colorectal disease 7 (1992), S. 192-196 
    ISSN: 1432-1262
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé Entre 1985 et 1992 46 patients avec un cancer épidermoide du canal anal ont été traités prospectivement par un protocole d'irradiation combiné à une chimiothérapie par 5-Fluorouracil et Mitomycin C. Le taux de survie, le taux de survie NED et le taux de contrôle local des tumeurs était de 84%, 71% et 83% à 5 ans. La fonction ano-rectale a été préservée chez 33 des 41 patients (80%). Nous avons observé une toxicité aigue sévère comprenant 3 décés mais une très faible morbidité ultérieure. Le seul facteur pronostic significatif (P=0.06) de contrôle local de la tumeur était le stade T. La survie NED était significativement affectée (P=0.02) par la réduction de la chimiothérapie durant la deuxième cure.
    Notizen: Abstract Between 1985 and 1992, 46 patients with epidermoid carcinoma of the anal canal were treated prospectively by a protocol of combined radiation and chemotherapy with 5-Fluorouracil and Mitomycin C. The survival rate, NED-survival rate and local tumour control rate were 84%, 71% and 83% at 5 years. Anorectal function was retained in 33 of 41 patients (80%). We observed severe acute toxicity including three deaths, but very little late morbidity. The only marginally significant prognostic factor (P=0.06) for local tumour control was T-stage. NED-survival was significantly affected (P=0.02) by reduction of chemotherapy during the second course.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    International journal of colorectal disease 9 (1994), S. 200-202 
    ISSN: 1432-1262
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé Six femmes et 39 hommes ont été traités entre janvier 1985 et décembre 1988 d'un sinus pilonidal non enflammé au moyen de sclérothérapie. En anesthésie locale, 1 à 2 ml d'une solution à 80% de phénol sont injectés dans le sinus. Le phénol est laissé en place durant 1 minute puis le sinus est irrigué avec une solution physiologique habituelle. Un questionnaire a été envoyé à 45 patients; 37 questionnaires sont utilisables pour l'évaluation. Une guérison compléte survient chez 22 patients (59,5%). Le temps de guérison moyen est de 6,2 semaines. En dehors d'une rougeur transitoire observée fréquemment en réponse á une inflammation causée par le phénol, 5 patients ont développé un abcès nécessitant un traitement chirurgical. Cette étude ne confirme donc pas les résultats encourageants d'autres séries.
    Notizen: Abstract Six female and 39 male outpatients, who suffered from acutely inflamed pilonidal sinus were treated by sclerotherapy between January 1985 and December 1988. Under local anaesthesia, 1–2 ml 80% phenol was injected into the sinus. The phenol, which was allowed to act for a minute, was washed out by irrigating the sinus with physiological common-salt solution. Of the questionnaire sent to all 45 patients, 37 proved suitable for evaluation. Complete healing occurred in 22 cases (59,8%). The healing time was 6.2 weeks on average. Besides a rather frequently observed transient reddening as a result of the local inflammation caused by the phenol, 5 patients developed an abcess which needed operative treatment. This study does not support the encouraging results of previous series.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Langenbeck's archives of surgery 379 (1994), S. 188-192 
    ISSN: 1435-2451
    Schlagwort(e): Laparoscopic colorectal surgery ; Valtrac ring ; Laparoscopic purse-string suture clamp
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Eine neu entwickelte laparoskopische Tabaksbeutelnahtklemme bietet in Kombination mit dem biofragmentierbaren Valtrac®-Ring die Möglichkeit, Anastomosen im Dünn- und Dickdarm intrakorporal ohne Stapler zu erstellen. Im Rahmen der hier vorgestellten tierexperimentellen Studie wurde bei 5 Schweinen eine End-zu-End-Anastomose im Colon descendens gebildet. Die Nachuntersuchung erfolgte bei 4 Tieren nach 21 Tagen und bei einem Tier am 1. postoperativen Tag. Eine Anastomoseninsuffizienz war in keinem Fall festzustellen. Die Anastomosen der Tiere, die 3 Wochen postoperativ nachuntersucht wurden, wiesen sowohl makroskopisch als auch histologisch nur geringe Narbenbildung auf. Die hier vorgestellte Anastomosentechnik könnte in Zukunft eine Alternative zu den assistiert laparoskopischen Eingriffen am rechten Kolon darstellen.
    Notizen: Abstract In combination with the biofragmentable Valtrac ring a newly developed purse-string suture clamp offers the possibility of performing intraperitoneal anastomoses of the small and large bowel without the need for stapling devices. During this experimental study endto-end anastomoses of the descending colon were constructed in five pigs. One animal was re-examined on day 1 after the operation and the others were all sacrificed on day 21 after. None of the animals showed any signs of an anastomotic leakage. Little scar tissue was seen macroscopically or histologically in the anastomotic region of the animals sacrificed 3 weeks after the operation. The operative technique presented in this paper might render the so-called assisted laparoscopic procedures for the right hemicolon unnecessary in the future.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    European archives of oto-rhino-laryngology and head & neck 249 (1992), S. 325-328 
    ISSN: 1434-4726
    Schlagwort(e): Auditory maturation ; Binaural interaction components ; Auditory brainstem responses ; Conductive hearing loss ; Guinea pigs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Reversible conductive hearing loss created during the first 4 weeks post partum caused marked alterations in the maturation of binaural interaction components in the auditory brainstem responses of guinea pigs. In untreated control animals all three components investigated demonstrated postnatal development in terms of latency shortening that was completed during the first 3 weeks of life. Plugging of both external ear canals caused a significant delay in the maturation of the late component DN2, where latency values of the controls were reached only 2 weeks after the end of the treatment, i.e. after 6 weeks of life. Monaural deprivation likewise led to a retarded development of peak latencies during the phase of imbalanced sensory imput. After the end of the one-sided conductive hearing loss the maturation process was markedly enhanced, even resulting in latency values for DN2 and DP1 that were significantly shorter than those of the controls. This phenomenon persisted until the end of the study period and was the case for both plugged and untreated ears in this group of animals. The time course of latencies in two other groups of experimental animals which were deprived in the same way as adults suggests that the effects observed are due to a sensitive period in the maturation process of the auditory pathway.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    European archives of oto-rhino-laryngology and head & neck 250 (1993), S. 362-365 
    ISSN: 1434-4726
    Schlagwort(e): Auditory maturation ; Conductive hearing loss ; Auditory brainstem responses ; Middle latency responses ; Guinea pigs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A reversible conductive hearing loss produced during the first 4 weeks post partum caused marked alterations in the development of click-evoked auditory brainstem (ABR) and middle latency (MLR) responses in guinea pigs. The early component PI in the ABR in controls showed adult-like latencies at the time of birth, while the later ABR components PIII and PV and all components investigated in the MLR showed postnatal development characterized by a shortened latency that persisted for the whole period of investigation. The course of the ABR latencies showed the sharpest decrease during the first 2–3 weeks of life, while that for the MLR took place during the first 5 weeks. In addition to the increased ABR thresholds and lengthened ABR latencies due to the conductive hearing loss, development of the ABR inter-peak latencies (IPL) and MLR latencies was retarded. The IPL reached control values 1 week after the end of the deprivation phase, while the delay in MLR started later (4th week) and lasted longer than did that in the ABR. These findings showed that a long-lasting postnatal conductive hearing loss does not generate sustained impairment at the level of the brainstem but can evoke longer-lasting deficiencies at higher stations of the auditory pathway.
    Materialart: Digitale Medien
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