50 research outputs found
Personalized and precision orthodontic therapy
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/111225/1/ocr12089.pd
Search for Gamma-Ray Burst Classes with the RHESSI Satellite
A sample of 427 gamma-ray bursts (GRBs), measured by the RHESSI satellite, is
studied statistically with respect to duration and hardness ratio. Standard
statistical tests are used, such as , F-test and the maximum likelihood
ratio test, in order to compare the number of GRB groups in the RHESSI database
with that of the BATSE database. Previous studies based on the BATSE Catalog
claim the existence of an intermediate GRB group, besides the long and short
groups. Using only the GRB duration as information and or
F-test, we have not found any statistically significant intermediate group in
the RHESSI data. However, maximum likelihood ratio test reveals a significant
intermediate group. Also using the 2-dimensional hardness / plane, the
maximum likelihood analysis reveals a significant intermediate group. Contrary
to the BATSE database, the intermediate group in the RHESSI data-set is harder
than the long one. The existence of an intermediate group follows not only from
the BATSE data-set, but also from the RHESSI one.Comment: Accepted for publication in Astronomy and Astrophysics, 9 pages, 4
figure
PhyloToAST: Bioinformatics Tools for Species-Level Analysis and Visualization of Complex Microbial Datasets
The 16S rRNA gene is widely used for taxonomic profiling of microbial ecosystems; and recent advances in sequencing chemistry have allowed extremely large numbers of sequences to be generated from minimal amounts of biological samples. Analysis speed and resolution of data to species-level taxa are two important factors in large-scale explorations of complex microbiomes using 16S sequencing. We present here new software, Phylogenetic Tools for Analysis of Species-level Taxa (PhyloToAST), that completely integrates with the QIIME pipeline to improve analysis speed, reduce primer bias (requiring two sequencing primers), enhance species-level analysis, and add new visualization tools. The code is free and open source, and can be accessed at http://phylotoast.org
A comparison of the gamma-ray bursts detected by BATSE and Swift
The durations of 388 gamma-ray bursts, detected by the Swift satellite, are
studied statistically in order to search for their subgroups. Then the results
are compared with the results obtained earlier from the BATSE database. The
standard chi^2 test is used. Similarly to the BATSE database, the short and
long subgroups are well detected also in the Swift data. Also the intermediate
subgroup is seen in the Swift database. The whole sample of 388 GRBs gives a
support for three subgroups.Comment: 9 pages, 3 figures, accepted for publication in Astronomy and
Astrophysic