130,669 research outputs found
Preliminary investigation of the thermal biosystem of Mt. Rittmann fumaroles (northern Victoria Land, Antarctica)
No full textThe biota and environment of fumarolic ground recently discovered near Mount Rittmann are described. Three patches (about 1 m2 each) of the moss Pohlia nutans were found in a minor caldera rim. Cyanophytes, chlorophytes, protozoa and bacteria were isolated from the moss and warm ground (30- 50°C). The results are compared with those of previous studies on Antarctic volcanoes. The origin of the geothermal flora is discussed in terms of long- distance transport of propagules to the continent
Einsatz von DNA-Chips zur Optimierung biotechnologischer prozesse.
No full textPolen T, Rittmann D, Wendisch VF, et al. Einsatz von DNA-Chips zur Optimierung biotechnologischer prozesse. BIOspektrum Sonderausgabe Biokatalyse. 2001:60-64
Procede pour produire des acides l-amines par fermentation au moyen de bacteries coryneformes
No full textWendisch VF, Rittmann D, Sahm H, Kreutzer C. Procede pour produire des acides l-amines par fermentation au moyen de bacteries coryneformes. 02.08.2007
Method for the Fermentative Production of L-Amino Acids With the Aid of Coryneform Bacteria Capable of Using Glycerin as the Only Carbon Source
No full textWendisch VF, Rittmann D, Sahm H, Kreutzer C. Method for the Fermentative Production of L-Amino Acids With the Aid of Coryneform Bacteria Capable of Using Glycerin as the Only Carbon Source. 27.11.2008
Crude glycerol-based production of amino acids and putrescine by Corynebacterium glutamicum
No full textMeiswinkel T, Rittmann D, Lindner S, Wendisch VF. Crude glycerol-based production of amino acids and putrescine by Corynebacterium glutamicum. Bioresource Technology. 2013;145:254-258
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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