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排序方式: 共有116条查询结果,搜索用时 15 毫秒
71.
72.
Purification and properties of the recBC DNase of Escherichia coli K-12 总被引:67,自引:0,他引:67
73.
74.
Background
Plasmid DNA molecules are closed circular molecules that are widely used in life sciences, particularly in gene therapy research. Monte Carlo methods have been used for several years to simulate the conformational behavior of DNA molecules. In each iteration these simulation methods randomly generate a new trial conformation, which is either accepted or rejected according to a criterion based on energy calculations and stochastic rules. These simulation trials are generated using a method based on crankshaft motion that, apart from some slight improvements, has remained the same for many years.Results
In this paper, we present a new algorithm for the deformation of plasmid DNA molecules for Monte Carlo simulations. The move underlying our algorithm preserves the size and connectivity of straight-line segments of the plasmid DNA skeleton. We also present the results of three experiments comparing our deformation move with the standard and biased crankshaft moves in terms of acceptance ratio of the trials, energy and temperature evolution, and average displacement of the molecule. Our algorithm can also be used as a generic geometric algorithm for the deformation of regular polygons or polylines that preserves the connections and lengths of their segments.Conclusion
Compared with both crankshaft moves, our move generates simulation trials with higher acceptance ratios and smoother deformations, making it suitable for real-time visualization of plasmid DNA coiling. For that purpose, we have adopted a DNA assembly algorithm that uses nucleotides as building blocks. 相似文献75.
H. Lemriss Martins Sim?es P S. Lemriss M. Butin A. Ibrahimi S. El Kabbaj JP Rasigade F. Laurent 《Standards in genomic sciences》2014,9(3):1118-1127
Staphylococcus capitis is a coagulase-negative staphylococcus (CoNS) commonly found in the human microflora. Recently, a clonal population of Staphylococcus capitis (denominated NRCS-A) was found to be a major cause of late-onset sepsis (LOS) in several neonatal intensive care units in France. Here, we report the complete genome sequence and annotation of the prototype Staphylococcus capitis NCRS-A strain CR01. The 2,504,472 bp long genome (1 chromosome and no plasmids) exhibits a G+C content of 32.81%, and contains 2,468 protein-coding and 59 tRNA genes and 4 rRNA genes. 相似文献
76.
77.
JP Valde LG Lawson A Lindberg JF Agger H Saloniemi O Østerås 《Acta veterinaria Scandinavica》2004,45(4):201-210
Data from the national dairy cow recording systems during 1997 were used to calculate lactation-specific cumulative risk of mastitis treatments and cumulative risk of removal from the herds in Denmark, Finland Norway and Sweden. Sweden had the lowest risk of recorded mastitis treatments during 305 days of lactation and Norway had the highest risk. The incidence risk of recorded mastitis treatments during 305 days of lactation in Denmark, Finland, Norway and Sweden was 0.177, 0.139, 0.215 and 0.127 for first parity cows and 0.228, 0.215, 0.358 and 0.204 for parities higher than three, respectively. The risk of a first parity cow being treated for mastitis was almost 3 times higher at calving in Norway than in Sweden. The period with the highest risk for mastitis treatments was from 2 days before calving until 14 days after calving and the highest risk for removal was from calving to 10 days after calving in all countries.The study clearly demonstrated differences in bovine mastitis treatment patterns among the Nordic countries. The most important findings were the differences in treatment risks during different lactations within each country, as well as differences in strategies with respect to the time during lactation mastitis was treated. 相似文献
78.
James?F?MeschiaEmail author Thomas?G?Brott Robert?D?BrownJr Richard?JP?Crook Michael?Frankel John?Hardy José?G?Merino Stephen?S?Rich Scott?Silliman Bradford?Burke?Worrall 《BMC neurology》2003,3(1):4
Background
The molecular basis for the genetic risk of ischemic stroke is likely to be multigenic and influenced by environmental factors. Several small case-control studies have suggested associations between ischemic stroke and polymorphisms of genes that code for coagulation cascade proteins and platelet receptors. Our aim is to investigate potential associations between hemostatic gene polymorphisms and ischemic stroke, with particular emphasis on detailed characterization of the phenotype. 相似文献79.
Gill Furze Alun Roebuck Peter Bull Robert JP Lewin David R Thompson 《BMC cardiovascular disorders》2002,2(1):1-5
Background
Systolic compression of a coronary artery by overlying myocardial tissue is termed myocardial bridging. Myocardial bridging usually has a benign prognosis, but some cases resulting in myocardial ischemia, infarction and sudden cardiac death have been reported. We are reporting a case of myocardial bridging which was complicated with acute myocardial infarction associated with inappropriate blood donation.Case presentation
A 33 year-old-man was admitted to our emergency with acute anteroseptal myocardial infarction after a blood donation. The electrocardiography showed sinus rhythm and was consistent with an acute anteroseptal myocardial infarction. We decided to perform primary percutanous intervention (PCI). Myocardial bridging was observed in the mid segment of the left anterior descending coronary artery on coronary angiogram. PCI was canceled and medical follow up was decided. Blood transfusion was made because he had a deep anemia. A normal hemaglobin level and clinical reperfusion was achieved after ten hours by blood transfusion. At the one year follow up visit, our patient was healthy and had no cardiac complaints.Conclusions
Myocardial bridging may cause acute myocardial infarction in various clinical conditions. Although the condition in this case caused profound anemia related acute myocardial infarction, its treatment and management was unusual. 相似文献80.
Vincens P; Buffat L; Andre C; Chevrolat JP; Boisvieux JF; Hazout S 《Bioinformatics (Oxford, England)》1998,14(8):715-725
MOTIVATION: Complete genomic sequences will become available in the future.
New methods to deal with very large sequences (sizes beyond 100 kb)
efficiently are required. One of the main aims of such work is to increase
our understanding of genome organization and evolution. This requires
studies of the locations of regions of similarity. RESULTS: We present here
a new tool, ASSIRC ('Accelerated Search for SImilarity Regions in
Chromosomes'), for finding regions of similarity in genomic sequences. The
method involves three steps: (i) identification of short exact chains of
fixed size, called 'seeds', common to both sequences, using hashing
functions; (ii) extension of these seeds into putative regions of
similarity by a 'random walk' procedure; (iii) final selection of regions
of similarity by assessing alignments of the putative sequences. We used
simulations to estimate the proportion of regions of similarity not
detected for particular region sizes, base identity proportions and seed
sizes. This approach can be tailored to the user's specifications. We
looked for regions of similarity between two yeast chromosomes (V and IX).
The efficiency of the approach was compared to those of conventional
programs BLAST and FASTA, by assessing CPU time required and the regions of
similarity found for the same data set. AVAILABILITY: Source programs are
freely available at the following address: ftp://ftp.biologie.ens.
fr/pub/molbio/assirc.tar.gz CONTACT: vincens@biologie.ens.fr,
hazout@urbb.jussieu.fr
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