3,134 publications from this institution
Abstract Motivation Advances in sequencing technologies have made it feasible to obtain massive datasets for phylogenomic inference, often consisting of large numbers of loci from multiple species and individuals. The phylogenomic analysis of next-generation sequencing (NGS) data requires a complex computational pipeline where multiple technical and methodological decisions are necessary that can influence the final tree obtained, like those related to coverage, assembly, mapping, variant calling and/or phasing. Results To assess the influence of these variables we introduce NGSphy, an open-source tool for the simulation of Illumina reads/read counts obtained from haploid/diploid individual genomes with thousands of independent gene families evolving under a common species tree. In order to resemble real NGS experiments, NGSphy includes multiple options to model sequencing coverage (depth) heterogeneity across species, individuals and loci, including off-target or uncaptured loci. For comprehensive simulations covering multiple evolutionary scenarios, parameter values for the different replicates can be sampled from user-defined statistical distributions. Availability and implementation Source code, full documentation and tutorials including a ‘Getting started’ guide are available at http://github.com/merlyescalona/ngsphy Supplementary information Supplementary data are available at Bioinformatics online.
Atrial natriuretic peptides are a family of hormones synthesized within the same prohormone secreted mainly within the atrium of the heart. These peptides correlate inversely with blood pressure (BP) in humans throughout the day. The increase in BP with increasing age could thus be associated with a decrease in these hormones as the person ages. The present investigation was designed to determine if these peptides, i.e., long acting natriuretic peptide (LANP), vessel dilator (VSDL) and atrial natriuretic factor (ANF), exhibit differing circadian characteristics in men as a function of age. The LANP, VSDL, and ANF were obtained from blood sampled every 3-hr for 24-hrs in men housed in a hospital setting at 3 different ocassions, 5 years apart. Seven men were studied 3 times; 4 in 2 ocassions, and 4 participated once. BP was always obtained by ambulatory monitoring at 15-min intervals. Lights were off at 22:30 h and on at 06:30 h. Hospital meals (2400 cal) were served at 16:30, 07:30 and 13:30 h. Circadian characteristics of hormones and BP in groups of subjects divided by age (<55, 19 profiles; and >55 years, 14 profiles) were established by population multiple-component analysis [Fernández JR, Hermida RC. Chronobiol Internat 1998;15:191–204]. A significant high amplitude rhythm (P < 0.001) was demonstrated for the three peptides in each age-group, with highest values consistently obtained at about 05:30 h. Significant declines in daily mean and amplitude (P < 0.005) were noted in the older group for all three peptides. A highly significant inverse correlation was found between the values of the three peptides and systolic and diastolic BP (P < 0.007). LANP, VSDL, and ANF exhibit a highly significant circadian variation as well as a significant decline with age. The present findings indicate that these BP lowering hormones are present in high concentrations in the early morning hours and in significantly lower concentrations throughout the day, in keeping with their inverse relation with BP.
Proper management of hypertension requires awareness of known ingestion-time differences in both the PK of individual BP-lowering medications and their combinations, which arise from circadian rhythms affecting absorption, distribution, metabolism, and elimination, and their PD, which result from circadian rhythms in mechanisms that regulate the 24 h BP pattern. The vast majority of the multiple published trials document substantially enhanced lowering of asleep BP, increased sleep-time relative BP decline (dipping), and markedly better reduction of CVD morbidity and mortality when hypertension medications and their combinations are ingested at bedtime rather than upon waking.
Abstract Review: 75 refs.
Research on metal nanoparticles has been boosted by a wide variety of applications that often require a precise definition of the morphological features at the nanometer scale. Although the preparation (often based on colloid chemistry) of metal nanoparticles with many different shapes and sizes has been developed and optimized for spheres, rods, cubes, platelets and other shapes, the last few years have seen a rising interest in branched morphologies. This review article describes the main synthetic processes for the fabrication of such branched nanoparticles, often termed as nanostars, as well as some of the principal applications that have been found. A special emphasis is given to optical properties related to localized surface plasmon resonances and surface enhanced spectroscopies, for which nanostars have been predicted and demonstrated to shine brighter than any other shapes, thus opening new avenues for highly sensitive detection or biolabelling, among other applications.