Bielefeld University

About: Bielefeld University is a education organization based out in Bielefeld, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Population & Quantum chromodynamics. The organization has 10123 authors who have published 26576 publications receiving 728250 citations. The organization is also known as: University of Bielefeld & UNIVERSITAET BIELEFELD.

Local similarity in RNA secondary structures

Abstract: We present a systematic treatment of alignment distance and local similarity algorithms on trees and forests. We build upon the tree alignment algorithm for ordered trees given by Jiang et. al (1995) and extend it to calculate local forest alignments, which is essential for finding local similar regions in RNA secondary structures. The time complexity of our algorithm is O(/F/sub 1///spl middot//F/sub 2//)/spl middot/deg(F/sub 1/)/spl middot/deg(F/sub 2/)/spl middot/(deg(F/sub 1/)+deg(F/sub 2/)) where /Fi/ is the number of nodes in forest Fi and deg(Fi) is the degree of Fi. We provide carefully engineered dynamic programming implementations using dense, two-dimensional tables which considerably reduces the space requirement. We suggest a new representation of RNA secondary structures as forests that allow reasonable scoring of edit operations on RNA secondary structures. The comparison of RNA secondary structures is facilitated by a new visualization technique for RNA secondary structure alignments. Finally, we show how potential regulatory motifs can be discovered solely by their structural preservation, and independent of their sequence conservation and position.

Efficient electrotransformation of corynebacterium diphtheriae with a mini-replicon derived from the Corynebacterium glutamicum plasmid pGA1.

Abstract: Efficient transformation of the human pathogen Corynebacterium diphtheriae was achieved with novel cloning vectors consisting of a mini-replicon from the cryptic C. glutamicum plasmid pGA1 as well as of the aph(3')-IIa or tetA(Z ) antibiotic resistance genes. Plasmid-containing transformants of C. diphtheriae were recovered at frequencies ranging from 1.3 x 10(5) to 4.8 x 10(6) colony forming units (cfu)/microg of plasmid DNA. Vector DNA was directly transferred from Escherichia coli into C. diphtheriae with frequencies up to 5.6 x 10(5) cfu/microg of plasmid DNA. On the basis of the pGA1 mini-replicon, an expression vector system was established for C. diphtheriae by means of the P(tac) promoter and the green fluorescent reporter protein. In addition, other commonly used vector systems from C. glutamicum, including the pBL1 and pHM1519 replicons, and the sacB conditionally lethal selection marker from Bacillus subtilis, were shown to be functional in C. diphtheriae. Thus, the ability to apply the standard methods of C. glutamicum recombinant DNA technology will greatly facilitate the functional analysis of the recently completed C. diphtheriae genome sequence.

UGA is an additional glycine codon in uncultured SR1 bacteria from the human microbiota

Abstract: The composition of the human microbiota is recognized as an important factor in human health and disease. Many of our cohabitating microbes belong to phylum-level divisions for which there are no cultivated representatives and are only represented by small subunit rRNA sequences. For one such taxon (SR1), which includes bacteria with elevated abundance in periodontitis, we provide a single-cell genome sequence from a healthy oral sample. SR1 bacteria use a unique genetic code. In-frame TGA (opal) codons are found in most genes (85%), often at loci normally encoding conserved glycine residues. UGA appears not to function as a stop codon and is in equilibrium with the canonical GGN glycine codons, displaying strain-specific variation across the human population. SR1 encodes a divergent tRNAGlyUCA with an opal-decoding anticodon. SR1 glycyl-tRNA synthetase acylates tRNAGlyUCA with glycine in vitro with similar activity compared with normal tRNAGlyUCC. Coexpression of SR1 glycyl-tRNA synthetase and tRNAGlyUCA in Escherichia coli yields significant β-galactosidase activity in vivo from a lacZ gene containing an in-frame TGA codon. Comparative genomic analysis with Human Microbiome Project data revealed that the human body harbors a striking diversity of SR1 bacteria. This is a surprising finding because SR1 is most closely related to bacteria that live in anoxic and thermal environments. Some of these bacteria share common genetic and metabolic features with SR1, including UGA to glycine reassignment and an archaeal-type ribulose-1,5-bisphosphate carboxylase (RubisCO) involved in AMP recycling. UGA codon reassignment renders SR1 genes untranslatable by other bacteria, which impacts horizontal gene transfer within the human microbiota.

S3-Leitlinie Nicht erholsamer Schlaf/Schlafstörungen

Abstract: Somnologie 2017 · 21:2–44 DOI 10.1007/s11818-016-0097-x Online publiziert: 27. Februar 2017 © Springer Medizin Verlag Berlin 2017 D. Riemann · E. Baum · S. Cohrs · T. Crönlein · G. Hajak · E. Hertenstein · P. Klose · J. Langhorst · G. Mayer · C. Nissen · T. Pollmächer · S. Rabstein · A. Schlarb · H. Sitter · H.-G. Weeß · T. Wetter · K. Spiegelhalder 1 Zentrum für Psychische Erkrankungen, Klinik für Psychiatrie und Psychotherapie, Medizinische Fakultät, Universität Freiburg, Freiburg, Deutschland 2 Zentrum für Methodenwissenschaften und Gesundheitsforschung, Abteilung für Allgemeinmedizin, Präventive und RehabilitativeMedizin, Philipps-UniversitätMarburg, Marburg, Deutschland