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  • 1
    ISSN: 1569-8041
    Keywords: Ftorafur ; leucovorin ; pancreatic cancer ; uracil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background/objectives: Uracil and tegafur in a 4 : 1 molar concentration ratio (UFT; Bristol-Myers Squibb, Wallingford, CT) has broad anti-tumor activity for cancers arising from the gastrointestinal tract. However, there are no published data regarding the efficacy of leucovorin-modulated UFT in patients with pancreatic cancer. The objective of this trial was to determine the activity and evaluate the toxicity of UFT plus oral calcium leucovorin in patients with advanced pancreatic adenocarcinoma. Patients and methods: Fourteen patients with advanced measurable adenocarcinoma of the pancreas were enrolled onto the trial. Patients received 300 mg/m2/d UFT plus 90 mg/d leucovorin administered orally in divided doses every eight hours for 28 days repeated every 35 days. Objective tumor response was evaluated after two courses of therapy. Results: Fourteen patients were evaluable for response and toxicity. No objective responses were seen. The median (range) time to progression and survival were 14 (1.6–37), and 15 (1.9–62) weeks, respectively. Toxicity was mild with severe (grade 3 or 4) hyperbilirubinemia, pain, diarrhea, transaminitis, venous thrombus, weakness, renal failure, confusion, and edema/ascites seen in three (21%), one (7%), two (14%), one (7%), one (7%), one (7%), one (7%), one (7%), and two (14%) patients, respectively. Conclusion: In the 14 patients evaluable, UFT 300 mg/m2/d plus oral leucovorin 90 mg/d administered for 28 days did not demonstrate anti-tumor activity against advanced pancreatic adenocarcinoma; however, this oral regimen was well tolerated and devoid of neutropenia, significant oral mucositis or diarrhea.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1093-1114 
    ISSN: 0392-6737
    Keywords: Interfaces ; PACS 71.35 ; Excitons and related phenomena (including electron-hole drops)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono state effettuate misure di fotoluminescenza, di fotoeccitazione e di riflettività, a varie temperature, su una serie di strutture a pozzi quantici GaAs/Ga1−x Al x As, cresciute con epitassia da fasci molecolari. I risultati della fotoluminescenza emessa nello strato depositato di GaAs sono analizzati e le sue proprietà ottiche sono collegate alle condizioni di crescita. Lo spostamento Stokes della riga di emissione dell'eccitone nel pozzo quantico è studiato in dipendenza delle varie condizioni di eccitazione. Si trova una considerevole diminuzione dello spostamento Stokes nel caso di eccitazione intensa e non risonante. Anche la fotoluminescenza estrinseca e la sua dipendenza dalla temperatura sono interpretate. Inoltre si mostra che gli effetti di temperatura su entrambi gli spettri del cristallo GaAs e del pozzo quantico chiariscono i ruoli del contributo eccitonico e delle transizioni interbanda.
    Abstract: Резюме Проведены измерения фотолюминесценции, фотолюминесценции возбуждения и козффициента отражения при различных температурах на образцах структур квантовых ям GaAs/Ga1−x Al x As, выраўенных с помощью эпитаксии молекулярного пучка. Анализируются некоторые данные по фотолюминесценции для буферных слоев GaAs для определения корреляции между оптическими свойствами и условиями выращивания. При различных условиях возбуждения исследуется сдвит Стокса линии испускания экситона на квантовых ямах. Наблюдается эаметное уменьшение сдвига Стокса в случае нерезонанснопо н интенсивного возбуждений. Также интерпретируются примесная фотолюминесценция и ее температурная зависимость. Показывается, что влияние температуры на обьемный спектр и спектр квантовых ям проясняет экситонные особенности и вклад межзонных переходов.
    Notes: Summary Measurements of photoluminescence, excitation photoluminescence and reflectance are performed at various temperatures on a series of GaAs/Ga1−x Al x As quantum well structures grown by molecularbeam epitaxy. The selective photoluminescence data of the GaAs buffer layers are analysed in order to correlate the optical properties with the growth conditions. The Stokes shift of the excitation emission line from quantum wells is investigated under various excitation conditions. A considerable decrease of the Stokes shift is observed in the case of nonresonant and intense excitations. Also the extrinsic photoluminescence, as well as its temperature dependence, are interpreted. In addition, the temperature effects on both the bulk and quantum well spectra are shown to clarify the excitation features and the contribution of the interband transitions.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical notes 61 (1997), S. 105-117 
    ISSN: 1573-8876
    Keywords: master equation ; minimal resolvent ; regularity conditions ; time-dependent coefficients ; a priori estimates for the resolvent ; von Neumann algebra ; predual semigroup
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We prove newa priori estimates for the resolvent of a minimal quantum dynamical semigroup. These estimates simplify well-known conditions sufficient for conservativity and impose continuity conditions on the time-dependent operator coefficients ensuring the existence of conservative solutions of the Markov evolution equations.
    Type of Medium: Electronic Resource
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