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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 63 (1996), S. 511-516 
    ISSN: 1432-0649
    Keywords: PACS: 03.65.Bz; 84.40.Ik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  We propose a phase-sensitive micromaser setup to demonstrate experimentally a violation of a Bell-type inequality. The interaction of atoms with the cavity field produces entanglement between the atoms and the cavity photons and therefore also between the atoms. We derive a Bell-type inequality for the atom–atom correlations and show that it can be violated not only in an idealized model but also under realistic circumstances when various sources of additional randomness are accounted for. Among them are the energy dissipation in the resonator and the Poissonian arrival statistics of the atoms.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 63 (1996), S. 511-516 
    ISSN: 1432-0649
    Keywords: 03.65.Bz ; 84.40.1k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a phase-sensitive micromaser setup to demonstrate experimentally a violation of a Bell-type inequality. The interaction of atoms with the cavity field produces entanglement between the atoms and the cavity photons and therefore also between the atoms. We derive a Bell-type inequality for the atom-atom correlations and show that it can be violated not only in an idealized model but also under realistic circumstances when various sources of additional randomness are accounted for. Among them are the energy dissipation in the resonator and the Poissonian arrival statistics of the atoms.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Internist 39 (1998), S. 909-916 
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Biometrie ; Randomisierung ; Klinische Studien ; Pharmakotherapie ; Studien ; Evidence Based Medicine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Für die Mehrzahl der hierzulande tätigen Ärztinnen und Ärzte dürfte zutreffen, daß sie sich zwar an den Ergebnissen klinischer, insbesondere therapeutischer Studien orientieren und sie in ihre ärztliche Tätigkeit integrieren. Wie aber solche Studien geplant und durchgeführt werden, ist nur einer Minderheit bekannt: das Fachgebiet der Medizinischen Biometrie ist sicher für viele Neuland. In der vorliegenden Arbeit werden zunächst die verschiedenen Typen klinischer Studien und deren potentielle Ziele erläutert; sodann werden dazu Beispiele vorgestellt. Des weiteren werden Verzerrungsquellen diskutiert und die Bedeutung randomisierter Studien und statistischer Schlußfolgerungen sowie Probleme unterdimensionierter Studien dargestellt. Selbst kritikfähig zu bleiben und nicht alle Studienergebnisse kritiklos zu übernehmen, setzt sicher die Kenntnis methodischer Grundlagen der Biometrie voraus.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Internist 39 (1998), S. 917-926 
    ISSN: 1432-1289
    Keywords: Schlüsselwörter Studien ; klinische ; M. Hodgkin ; Therapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Die vorliegende Arbeit beschreibt die Entwicklung und Optimierung von Therapiestrategien für das Hodgkin-Lymphom innerhalb der Deutschen Hodgkin Lymphom Studiengruppe (DHSG) in den letzten 20 Jahren. Rekrutierte die DHSG im Jahr 1980 gerade 20 Patienten in 8 Behandlungszentren, so waren es im Jahr 1998 schon mehr als 700 Patienten in über 300 Zentren in Deutschland und im europäischen Ausland. Innerhalb dieser Zeit wurden Hodgkin-Patienten streng stadienadaptiert in 3 Studiengenerationen innerhalb prospektiv randomisierter Therapiestudien behandelt. Die 4. Studiengeneration wurde in diesem Jahr aktiviert. Der Schwerpunkt der Therapieoptimierung in den frühen und intermediären Stadien war die Reduktion der Toxizität der Strahlentherapie unter Beibehaltung der guten Therapieergebnisse. Das Bemühen in den fortgeschrittenen Stadien galt der Verbesserung der unbefriedigenden Therapieergebnisse. Durch die Entwicklung einer Zeit- und Dosis-intensivierten Therapie gelang hier in der 3. Studiengeneration erstmals ein therapeutischer Durchbruch für diese Patienten. Ein großes Anliegen der Studie war von Beginn an die Qualitätssicherung. Hierfür waren neben der Arbeit der Studienzentrale insbesondere die Einrichtung einer Referenzpathologie und einer Referenzstrahlentherapie entscheidend. Diese Gremien hatten entscheidenden Anteil daran, daß im Rahmen der bisherigen Studiengenerationen der DHSG die Qualität der Behandlung flächendeckend zwischen den einzelnen Zentren angeglichen werden konnte.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1569-8041
    Keywords: B-cell ; bone marrow transplantation ; high risk ; peripheral blood stem cells ; poor prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1569-8041
    Keywords: chemotheapy ; dose escalation ; efficacy ; Hodgkin's disease ; toxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The BEACOPP chemotherapy regimen for advanced Hodgkin's disease employs a rearranged schedule permitting a shortened three-week cycle. With haematological growth factor support, the dosages of cyclophosphamide, etoposide and adriamycin could be moderately escalated. The 3-armed multicentre HD9 trial (recruitment 1993-1998; 1300 patients randomised) aimed to compare BEACOPP with the standard COPP/ABVD chemotherapy and to detect and measure the gain in efficacy, if any, due to moderate dose escalation of BEACOPP. Eight cycles were given, followed by local irradiation. The most recent interim analysis, with 689 evaluable patients, circa 40% of all expected events and a median observation time of 27 months, showed significant differences in progression rate (P) and in two-year freedom from treatment failure (F) between the treatment arms, with escalated BEACOPP (P = 2%, F = 89%) better than baseline BEACOPP (P = 9%, F = 81%) better than COPP/ABVD (P = 13%, F = 72%). Survival was not significantly different. Acute toxicity was more severe due to dose escalation, but remained manageable. These preliminary results suggest that BEACOPP improves efficacy. Moderate dose escalation is feasible with G-CSF support and appears likely to make a worthwhile improvement in the cure rate. The results must await confirmation (or otherwise) by the final analysis including all randomised patients and sufficiently mature data.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1569-8041
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: At present, treatment results for patients withadvanced-stage Hodgkin's disease remain unsatisfactory. Standard chemotherapyM(C)OPP (nitrogen mustard (cyclophosphamide), vincristine, procabazine, andprednisone), ABVD (adriamycine, bleomycine, vinblastine, and dacarbacine) orM(C)OPP/ABVD +/− radiotherapy fail to achieve long-term completeremission in 35% to 50% of these patients. The BEACOPP(bleomycin, etoposide, adriamycine, cyclophosphamide, vincristine,procarbazine, and prednisone) regimen was developed to improve treatmentresults by dose intensification achieved by reduced duration of treatment(time intensification) and addition of etoposide. Patients and methods: Thirty untreated patients with advancedHodgkin's disease stage IIB–IV according to the Ann Arbor classificationwere treated with the time intensified BEACOPP regimen. Each patient wasscheduled to receive eight cycles of chemotherapy with consolidatingradiotherapy to sites of initial bulk disease and to residual tumor remainingafter chemotherapy. Results: All patients were evaluable for assessment of toxicity,treatment response, freedom from treatment failure (FFTF) and survival (SV).Of 30 treated patients, 29 patients received the intended eight cycles ofBEACOPP. One patient, in clinical CR, terminated the chemotherapy at his ownrequest after six cycles and is at this time, 48 months after the end oftreatment, in complete remission. Toxicity was tolerable with WHO grade 3/4leucopenia in 28% of chemotherapy cycles and one severe (WHO grade 3)infection. No treatment-related death occurred. Cycles could generally begiven on schedule. Complete remission (CR) was achieved in all but twopatients (93%). At present, only one patient has relapsed. At a medianfollow-up of 40 months, FFTF-rate is 89% (lower confidence limit:80%). One patient died due to progressive disease. Conclusion: The BEACOPP regimen is feasible at moderate hematopoeitictoxicity. With a FFTF-rate of 89% at a median follow-up of 40 months,the treatment results are very encouraging. A prospective randomised trial hasbeen initiated to compare the BEACOPP regimen with the standard COPP/ABVDregimen in advanced-stage Hodgkin's disease.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annals of oncology 9 (1998), S. 73-78 
    ISSN: 1569-8041
    Keywords: chemotherapy ; dose response relationship ; Hodgkin's disease ; randomised clinical trials ; statistical models ; tumour growth kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this article we summarize the theoretical arguments which led us in the German Hodgkin's Disease Study Group to introduce the BEACOPP-regimen and to initiate a large randomised trial to investigate the role of moderate dose escalation in the treatment of advanced stage Hodgkin's disease. Although some indications for a role of dose were available in the early 1990s no prospective randomised trial had been undertaken. In order to obtain an impression of the shape of the essential dose response characteristic we developed a novel statistical model that could be used to analyse a set of data in which dose variations had occured. The model took tumour growth and chemotherapy effects into account. The model could be applied to clinical data on tumour control and treatment given in a patient population. The model was fitted to the data of 706 patients which had received COPP/ABVD-like regimens. It revealed considerable heterogeneity in chemosensitivity and a positive slope of the doseresponse relationship. The model was used to simulate the effect of various treatment strategies with dose escalation and schedule changes. On the basis of such simulations we predicted that shortening cycle intervals from 4 to 3 weeks should lead to small benefits (about 3% in five-year tumour control rates). In contrast, we predicted that a moderate average dose escalation by 30% of a standard chemotherapy would lead to a potential benefit in the order of 10%-15% in tumour control at five years. Subsequently we searched for a treatment scheme that would permit such a dose escalation. The BEACOPP-scheme was invented to allow the three major myelotoxic substances (cyclophsphamide, adriamycin and etoposide) to be given in the beginning of a cycle. These three substances were then subject to dose escalation in a dose finding trial. G-CSF was introduced to compensate for the myelotoxic effects. The dose level found feasible for a large multicentre setting turned out to be in the required magnitude. The HD9 trial of the GHSG was then initiated to examine whether the predicted dose response curve really exists.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0016-7835
    Keywords: Key words Neotectonics ; Seismicity ; Fault-plane solution ; Stress ; Coda Q ; Earthquake ; Micro-earthquake ; Fault ; Pull-apart basin ; Overstep ; Strike slip ; North Anatolian Fault ; Turkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The course of the active North Anatolian Fault system from Lake Abant to Lake Sapanca was traced by its high micro-earthquake activity. If approaching from the east this section includes a broad south to north overstep (fault offset) of the main fault. Local seismicity has been recorded in this area by a semi-permanent network of 8 stations since 1985 within the frame of the Turkish–German Joint Project for Earthquake Research. The effect of the overstep and its complex fracture kinematics are reflected by the seismicity distribution, the variations of composite fault-plane solutions, and by the spatial coda-Q distribution. Areas of different stress orientation can be distinguished and assigned to different groups of faults. The stresses and the tectonic pattern only in part correspond to a simple model of an extensional overstep and its correlative pull-apart basin. Other types of deformation involved are characterized by normal faulting on faults parallel to the general course of the main strike-slip fault and by synthetic strike-slip faults oriented similar to Riedel shears. Shear deformation by this fault group widely distributed in an area north and east of the main fault line may play an important role in the evolution of the overstep. The development of a pull-apart basin is inhibited along the eastern half of the overstep and compatibility of both strands of the main fault (Bolu–Lake Abant and Lake Sapanca– Izmit–Marmara Sea) seems to be achieved with the aid of the fault systems mentioned. The extension of the missing part of the pull-apart basin seems to be displaced to positions remote from the Lake Abant–Lake Sapanca main fault line, i.e. to the Akyaz℩–Düzce basin tract. Highest Q-values (lowest attenuation of seismic waves) were found in the zone of highest seismicity north and west of the overstep which is the zone of strongest horizontal tension. If high coda-Q is an indicator for strong scattering of seismic waves it might be related to extensional opening of fractures.
    Type of Medium: Electronic Resource
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