1,764 research outputs found
Datasets for transcriptomics, q-proteomics and phenotype microarrays of polyphosphate metabolism mutants from Escherichia coli
Indexación: Scopus.Author acknowledges Fondecyt Grants 1120209, 1121170 and Anillo ACT-1107Here, we provide the dataset associated with our research article on the polyphosphate metabolism entitled, “Multi-level evaluation of Escherichia coli polyphosphate related mutants using global transcriptomic, proteomic and phenomic analyses”. By integrating different omics levels (transcriptome, proteome and phenome), we were able to study Escherichia coli polyphosphate mutant strains (Δppk1, Δppx, and Δppk1-ppx). We have compiled here all datasets from DNA microarrys, q-proteomic (Isotope-Coded Protein Labeling, ICPL) and phenomic (Phenotype microarray) raw data we have obtained in all polyP metabolism mutants.http://www.sciencedirect.com/science/article/pii/S2352340917300860?via%3Dihu
Electron-positron pair creation in the superposition of two oscillating electric field pulses with largely different frequency, duration and relative positioning
Production of electron-positron pairs in two oscillating strong electric
field pulses with largely different frequencies and durations is considered. In
a first scenario, the influence of a low-frequency background field on pair
production by a short main pulse of high frequency is analyzed. The background
field is shown to cause characteristic modifications of the momentum spectra of
created particles which, in turn, may be used for imaging of the background
pulse. In a second scenario, an ultrashort, relatively weak assisting pulse is
superimposed onto a strong main pulse. By studying the dependence of the pair
production on the field parameters it is shown that duration and relative
position of the ultrashort pulse modify the momentum spectra of produced
particles in a distinctive way. Both scenarios enable, moreover, to extract
partial information about the time periods when pairs with certain momenta are
produced predominantly.Comment: 10 pages, 9 figure
Synthesis, characterization of a new carbonylated zirconium metallocene using a dichloro-zirconocene derived from partially alkylated s-indacene
Indexación: ScieloThis work describes the synthesis and characterization of new organometallic species, an unprecedented mononuclear zirconium complex bearing a tetraalkylated s-indacene ligand, and secondly, its respective dicarbonyl complex obtained by reduction with Mg/HgCl2. Theoretical calculations of these two compounds were carried out to gain further understanding of these novel molecular systems.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000300014&lng=es&nrm=is
Lifetimes of Confined Acoustic Phonons in Ultra-Thin Silicon Membranes
We study the relaxation of coherent acoustic phonon modes with frequencies up
to 500 GHz in ultra-thin free-standing silicon membranes. Using an ultrafast
pump-probe technique of asynchronous optical sampling, we observe that the
decay time of the first-order dilatational mode decreases significantly from
\sim 4.7 ns to 5 ps with decreasing membrane thickness from \sim 194 to 8 nm.
The experimental results are compared with theories considering both intrinsic
phonon-phonon interactions and extrinsic surface roughness scattering including
a wavelength-dependent specularity. Our results provide insight to understand
some of the limits of nanomechanical resonators and thermal transport in
nanostructures
Bat consumption by Philodryas viridissima (Serpentes: Colubridae) in the Amazon Basin of southeastern Peru
New observations on diet of the South American two-striped forest-pitviper <i>Bothrops bilineatus smaragdinus</i> (Hoge, 1966)
The arboreal, nocturnal and widely distributed snake Bothrops bilineatus smaragdinus (Squamata, Viperidae) is known as a generalist whose diet items have rarely been identified to species level. In this work we report three new items for its diet: an adult frog Dendropsophus marmoratus (Anura, Hylidae), an adult lizard Thecadactylus solimoensis (Squamata, Phyllodactylidae), and an adult bat Carollia brevicauda (Chiroptera, Phyllostomidae), the latter being the first record of predation of a Chiropteran by this species.Asociación Herpetológica Argentin
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