University of Jena

About: University of Jena is a education organization based out in Jena, Thüringen, Germany. It is known for research contribution in the topics: Laser & Population. The organization has 22198 authors who have published 45159 publications receiving 1401514 citations. The organization is also known as: Friedrich-Schiller-Universität Jena & Friedrich Schiller University Jena.

The Impact of Vulnerability to and Severity of a Health Risk on Processing and Acceptance of Fear-Arousing Communications: A Meta-Analysis:

Abstract: This meta-analysis of studies of the persuasive impact of fear appeals evaluated the contribution of our stage model of the processing of fear-arousing communications relative to other fear appeal ...

Overyielding in experimental grassland communities - irrespective of species pool or spatial scale

Abstract: In a large integrated biodiversity project (The Jena Experiment in Germany) we established two experiments, one with a pool of 60 plant species that ranged broadly from dominant to subordinate competitors on large 20 · 20 m and small 3.5 · 3.5 m plots (¼ main experiment), and one with a pool of nine potentially dominant species on small 3.5 · 3.5 m plots (¼ dominance experiment). We found identical positive species richness–aboveground productivity relationships in the main experiment at both scales. This result suggests that scaling up, at least over the short term, is appropriate in interpreting the implications of such experiments for larger-scale patterns. The species richness–productivity relationship was more pronounced in the experiment with dominant species (46.7 and 82.6% yield increase compared to mean monoculture, respectively). Additionally, transgressive overyielding occurred more frequently in the dominance experiment (67.7% of cases) than in the main experiment (23.4% of cases). Additive partitioning and relative yield total analyses showed that both complementarity and selection effects contributed to the positive net biodiversity effect.

Treatment of colorectal liver metastases.

Abstract: Background: Surgical resection is the only potentially curative treatment for colorectal liver metastases, with 5-year survival rates approaching 40 per cent. However, at present only 20–25 per cent of such lesions are deemed resectable. This review examines developments in neoadjuvant and adjuvant treatments of colorectal liver metastases that aim to improve the results of surgical management of this disease. Methods: A literature review was undertaken based on a Medline search from 1970 to May 1998. Results: Further evolution in surgical technique is unlikely to lead to a dramatic increase in the resectability rate of colorectal liver metastases. Recent developments in neoadjuvant and adjuvant chemotherapy schedules, together with a range of interventional radiological procedures and interstitial lytic techniques, show promise in terms of extending the limits of resectability and decreasing recurrence rates associated with these lesions. Using multimodality regimens 5-year survival rates of 40 per cent are now being reported for lesions that were initially considered irresectable. Conclusion: Patients with colorectal liver metastases should be assessed in units that can offer all the specialist techniques necessary to deliver optimum care. Incorporation of newer neoadjuvant and adjuvant treatments into management strategies should occur in the setting of randomized trials. © 1999 British Journal of Surgery Society Ltd

Adaptation to Fe-deficiency requires remodeling of the photosynthetic apparatus

Abstract: The molecular mechanisms underlying the onset of Fe-deficiency chlorosis and the maintenance of photosynthetic function in chlorotic chloroplasts are relevant to global photosynthetic productivity. We describe a series of graded responses of the photosynthetic apparatus to Fe-deficiency, including a novel response that occurs prior to the onset of chlorosis, namely the disconnection of the LHCI antenna from photosystem I (PSI). We propose that disconnection is mediated by a change in the physical properties of PSI-K in PSI in response to a change in plastid Fe content, which is sensed through the occupancy, and hence activity, of the Fe-containing active site in Crd1. We show further that progression of the response involves remodeling of the antenna complexes—specific degradation of existing proteins coupled to the synthesis of new ones, and establishment of a new steady state with decreased stoichiometry of electron transfer complexes. We suggest that these responses are typical of a dynamic photosynthetic apparatus where photosynthetic function is optimized and photooxidative damage is minimized in graduated responses to a combination of nutrients, light quantity and quality.