Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection.

The precise value of the mean neutron lifetime, τn, plays an important role in nuclear and particle physics and cosmology. It is used to predict the ratio of protons to helium atoms in the primordial universe and to search for physics beyond the Standard Model of particle physics. We eliminated loss mechanisms present in previous trap experiments by levitating polarized ultracold neutrons above the surface of an asymmetric storage trap using a repulsive magnetic field gradient so that the stored neutrons do not interact with material trap walls. As a result of this approach and the use of an in situ neutron detector, the lifetime reported here [877.7 ± 0.7 (stat) +0.4/-0.2 (sys) seconds] does not require corrections larger than the quoted uncertainties.

[Comparison of three outpatient therapy forms for treatment of chronic low back pain-- findings of a multicentre, cluster randomized study]. / Vergleich dreier ambulanter Therapieformen zur Behandlung chronischer Rückenschmerzen-- Ergebnisse einer multizentrischen, clusterrandomisierten Studie.

The AOK Baden-Württemberg health insurance fund initiated a study on the outpatient rehabilitation of patients with chronic low back pain, aimed at improving the treatment concept for its insurees with chronic low back pain (START). This model project was scientifically guided by the Hochrhein-Institute in Bad Säckingen. The paper compares the effectiveness of Enhanced Outpatient Physiotherapy (Erweiterte Ambulante Physiotherapie, EAP), Outpatient Rehabilitation (Ambulante Rehabilitation, AR) and Medical Training Therapy (Medizinische Trainingstherapie, MTT) in patients with low back pain. In seven regions in Baden-Württemberg, one of these three intervention forms was provided to the patients. A total of 1,274 patients were included in the study. The AOK Baden-Württemberg patients receiving treatment in one of the three intervention forms were seriously restricted in both the physical dimension of their health status and in their physical mobility in everyday life and at the workplace. Besides, they frequently reported considerable psychosocial strain. The three interventions led to significant and relevant decreases in pain intensity and to an improved health-related quality of life. There were no significant differences between the various treatments in terms of effectiveness. The patients shared an equally high satisfaction with the treatment received. In MTT, the total therapy length of 15 weeks was by far longer than in AR and EAP (about 5 and 8 weeks). Unlike AR and, in parts, EAP, patients may continue to work while participating in MTT. Therefore an immediate therapy start within a week was more likely possible in MTT (59 %) than in AR (10 %) or EAP (23 %). In evaluating the results a number of restrictions have to be considered. Nevertheless, based on our research findings, the following can be concluded: MTT is a suitable therapy concept in patients with low back pain characterized by a rapid start and-- compared to the other two concepts-- by lower therapy costs. MTT might represent a meaningful therapy element also in new forms of provision such as integrated services. Patients showing severe psychosocial strain should be assigned to an interdisciplinary therapy as it is provided by inpatient and outpatient rehabilitation facilities. For effective differential assignment to the various programmes, realization of a standardized rehab assessment is an important precondition.

[Development of a guideline for rehabilitation of patients with low back pain-- phase 2: analysis of data of the classification of therapeutic procedures]. / Leitlinienentwicklung in der Rehabilitation bei Rückenschmerzpatienten--Phase 2: Ergebnisse einer Analyse von KTL-Daten.

Initiated by the Federal Insurance Institute for Salaried Employees (BfA, Bundesversicherungsanstalt für Angestellte), the project is aimed at developing an evidence-based guideline for rehabilitation of patients with low back pain (LBP). Guideline development will be based on a systematic review of the literature, an analysis of the treatment procedures currently employed in rehabilitation, inclusion of the patients' perspectives as well as consultation of experts' panels of clinically experienced physicians and therapists. Formulation of the guideline will then be carried out in a structured consensus building process. This article is focused on analysing the present situation with regard to the treatments received by patients insured by the BfA, using data from routine documentation according to the Classification of Therapeutic Procedures (KTL, Klassifikation Therapeutischer Leistungen). The analysis is intended to provide indications of a basic need to implement a common guideline as well as, simultaneously, to explore possible deficits in present treatment practices, hence to define priorities requiring special attention in the framework of guideline development. As a result of a systematic literature review, the KTL-defined therapeutic procedures that had emerged as relevant in the rehabilitation of LBP patients were aggregated into so-called therapeutic modules which then formed the basis of the analysis. In all, more than 46,000 KTL-data of 2438 patients with a diagnosis of "low back pain" (M54.5 ICD-10) were included. In the rehab centres investigated, rehabilitation of patients with LBP follows a multidimensional, multiprofessional therapeutic strategy. More than 90 % of all patients receive treatments from the modules "medical training therapy", "health education", "physiotherapy", and "physical therapy". Treatments provided to a majority of the patients are massage (78 %), electrotherapy (67 %) as well as psychotherapy (68 %). Women more frequently than men receive therapies belonging to the "psychological treatments" and "occupational therapies" modules; younger patients receive more of the "training therapies", and more often. When treatments are compared across centres, a large variability in the therapeutic procedures provided becomes apparent. This high degree of variability suggests that development and implementation of a common clinical practice guideline for rehabilitation of patients with chronic low back pain should receive priority attention.

Precision of circadian wake and activity onset timing in the mouse.

In each circadian cycle, a mouse begins its major activity period with discrete wake onset and activity onset events. The precision with which these events are timed in constant darkness was analyzed using the approach outlined by Pittendrigh and Daan (1976). Negative serial correlations of observed circadian period values (mean r1 = -0.471 for wake data, -0.409 for activity data) imply that deviations in period tend to be compensated by opposite deviations in the following cycle. As a result, precision of the circadian pacemaker must be better than that of observed rhythms. Standard deviation of the pacemaker period sigma(tau) was estimated at 5.1 min. Some individual data series had estimates s(tau) = 0, implying a nearly perfect pacemaker. Previous speculation was that wake onset would be under more direct pacemaker control than activity onset, and would therefore be timed more precisely (Pittendrigh and Daan 1976; Richardson et al. 1985). Contrary to this prediction, intervals between successive wake onsets exhibited significantly greater variance than intervals between successive activity onsets. Two possible interpretations of this finding were proposed.