865 research outputs found
N-(Phenoxyalkyl)amides as MT1 and MT2 ligands: Antioxidant properties and inhibition of Ca2+/CaM-dependent kinase II
Recently a series of chiral N-(phenoxyalkyl)amides have been reported as potent MT(1) and MT(2) melatonergic ligands. Some of these compounds were selected and tested for their antioxidant properties by measuring their reducing effect against oxidation of 2',7'-dichlorodihydrofluorescein (DCFH) in the DCFH-diacetate (DCFH-DA) assay. Among the tested compounds, N-[2-(3-methoxyphenoxy)propyl]butanamide displayed potent antioxidant activity that was stereoselective, the (R)-enantiomer performing as the eutomer. This compound displayed strong cytoprotective activity against H(2)O(2)-induced cytotoxicity resulting slightly more active than melatonin, and performed as Ca(2+)/calmodulin-dependent kinase II (CaMKII) inhibitor, to
MOMDIS: a Glauber model computer code for knockout reactions
A computer program is described to calculate momentum distributions in
stripping and diffraction dissociation reactions. A Glauber model is used with
the scattering wavefunctions calculated in the eikonal approximation. The
program is appropriate for knockout reactions at intermediate energy collisions
(30 MeV Enucleon MeV). It is particularly useful
for reactions involving unstable nuclear beams, or exotic nuclei (e.g.
neutron-rich nuclei), and studies of single-particle occupancy probabilities
(spectroscopic factors) and other related physical observables. Such studies
are an essential part of the scientific program of radioactive beam facilities,
as in for instance the proposed RIA (Rare Isotope Accelerator) facility in the
US.Comment: 22 pages. Accepted for publication in Computer Physics
Communications. Code available from CPC web sit
Liquid baits with Oenococcus oeni increase captures of Drosophila suzukii
The spotted-wing drosophila (SWD), Drosophila suzukii Matsumura (Diptera: Drosophilidae), native to Eastern Asia, is an invasive alien species in Europe and the Americas, where it is a severe pest of horticultural crops, including soft fruits and wine grapes. The conventional approach to controlling infestations of SWD involves the use of insecticides, but the frequency of application for population management is undesirable. Consequently, alternative strategies are urgently needed. Effective and improved trapping is important as an early risk detection tool. This study aimed to improve Droskidrink® (DD), a commercially available attractant for SWD. We focused on the chemical and behavioral effects of adding the bacterium Oenococcus oeni (Garvie) to DD and used a new trap design to enhance the effects of attractive lures. We demonstrate that microbial volatile compounds produced by O. oeni are responsible for the increase in the attractiveness of the bait and could be later utilized for the development of a better trapping system. Our results showed that the attractiveness of DD was increased up to two-fold by the addition of commercially available O. oeni when combined with an innovative trap design. The new trap-bait combination increased the number of male and especially female catches at low population densitie
IR-correlated 31 GHz radio emission from Orion East
Lynds dark cloud LDN1622 represents one of the best examples of anomalous
dust emission, possibly originating from small spinning dust grains. We present
Cosmic Background Imager (CBI) 31 GHz data of LDN1621, a diffuse dark cloud to
the north of LDN1622 in a region known as Orion East. A broken ring with
diameter g\approx 20 arcmin of diffuse emission is detected at 31 GHz, at
\approx 20-30 mJy beam with an angular resolution of \approx 5 arcmin.
The ring-like structure is highly correlated with Far Infra-Red emission at
m with correlation coefficients of r \approx 0.7-0.8, significant
at . Multi-frequency data are used to place constraints on other
components of emission that could be contributing to the 31 GHz flux. An
analysis of the GB6 survey maps at 4.85 GHz yields a upper limit on
free-free emission of 7.2 mJy beam (\la 30 per cent of the observed
flux) at the CBI resolution. The bulk of the 31 GHz flux therefore appears to
be mostly due to dust radiation. Aperture photometry, at an angular resolution
of 13 arcmin and with an aperture of diameter 30 arcmin, allowed the use of
IRAS maps and the {\it WMAP} 5-year W-band map at 93.5 GHz. A single modified
blackbody model was fitted to the data to estimate the contribution from
thermal dust, which amounts to \sim\sim100 \mu18.1\pm4.4 \mu^{-1}$, consistent with the values found for
LDN1622.Comment: 8 pages, 3 figures, 3 tables, submitted to MNRA
Three years of harvest with the vector vortex coronagraph in the thermal infrared
For several years, we have been developing vortex phase masks based on
sub-wavelength gratings, known as Annular Groove Phase Masks. Etched onto
diamond substrates, these AGPMs are currently designed to be used in the
thermal infrared (ranging from 3 to 13 {\mu}m). Our AGPMs were first installed
on VLT/NACO and VLT/VISIR in 2012, followed by LBT/LMIRCam in 2013 and
Keck/NIRC2 in 2015. In this paper, we review the development, commissioning,
on-sky performance, and early scientific results of these new coronagraphic
modes and report on the lessons learned. We conclude with perspectives for
future developments and applications.Comment: To appear in SPIE proceedings vol. 990
Caracterização e avaliação dos padrões alares obtidos do cruzamento de diferentes espécimes de Mahanarva spectabilis (Distant, 1909) (Hemiptera: cercopidae).
Lynds 1622: a nearby star forming cloud projected on Orion B?
We present results of optical spectroscopic and photometric observation of
the pre-main sequence stars associated with the cometary shaped dark cloud
Lynds 1622, and 12CO and 13CO observations of the cloud. We determined the
effective temperatures and luminosities of 14 pre-main sequence stars
associated with the cloud from their positions in the Hertzsprung--Russell
diagram, as well as constructed their spectral energy distributions using
optical, 2MASS and Spitzer IRAC and MIPS data. We derived physical parameters
of L1622 from the molecular observations. Our results are not compatible with
the assumption that L1622 lies on the near side of the Orion-Eridanus loop, but
suggest that L1622 is as distant as Orion B. At a distance of 400 pc the mass
of the cloud, derived from our CO data, is 1100 solar masses, its star
formation efficiency is 1.8%, and the average age of its low-mass pre-main
sequence star population is about 1 million years.Comment: 13 pages, 9 figures, 4 tables; accepted by MNRA
Interação da temperatura e estado nutricional de braquiária na sobrevivência das cigarrinhas das pastagens.
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