295 research outputs found
Axima nordestina (Hymenoptera, Eurytomidae), a new stalk-eyed wasp from Brazilian savannah
AbstractA new stalk-eyed wasp Axima nordestina sp. n. is described from the Northeastern Brazilian savannah. Axima nordestina is the fourth species of stalk-eyed wasps (A. noyesi species group) and the second one known from Brazil. The head morphology of A. nordestina appears less derived than in the other known species. An updated key of the A. noyesi species group is provided
In vitro cultivation of Pleurotus ostreatus and Lentinula edodes in lignocellulosic residues from Amazon
The mycelial growth speed of Pleurotus ostreatus (POS 09/100) and Lentinula edodes (LED 96/13) was evaluated in four substrates based on Simarouba amara sawdust, Anacardium giganteum sawdust, Euterpe precatoria seeds and Musa sp. AAB stems. The loss of organic matter of the substrates and the mycelial vigor of the strains studied were also evaluated. The greatest mycelial growth for P. ostreatus occurred in the substrates formulated with S. amara sawdust (29.45 cm3/day) and A. giganteum (27.58 cm3/day). The best performance for L. edodes occurred in the substrate of A. giganteum (13.22 cm3/day), followed by the S. amara (11.30 cm3/day). The most intense rates of vigor were presented in the E. precatoria substrate which was added with brans. The most significant loss of organic matter for both mushrooms occurred in the substrate formulated with a supplement of A. giganteum (54% for P. ostreatus and 61% for L. edodes). There was no mycelial growth in the formulation prepared with banana stem in both mushrooms tested.Key words: Edible fungi, mycelial growth, alternative substrates
The SZ effect as a cosmological discriminator
We show how future measurements of the SZ effect (SZE) can be used to
constrain the cosmological parameters. We combine the SZ information expected
from the Planck full-sky survey, N(S), where no redshift information is
included, with the N(z) obtained from an optically-identified SZ-selected
survey covering less than 1% of the sky. We demonstrate how with a small
subsample (approx. 300 clusters) of the whole SZ catalogue observed optically
it is possible to drastically reduce the degeneracy among the cosmological
parameters. We have studied the requirements for performing the optical
follow-up and we show the feasibility of such a project. Finally we have
compared the cluster expectations for Planck with those expected for Newton-XMM
during their lifetimes. It is shown that, due to its larger sky coverage,
Planck will detect a factor approx. 5 times more clusters than Newton-XMM and
also with a larger redshift coverage.Comment: 14 pages, 10 figures. Submitted to MNRAS. Figs. 4 and 5 are bitmapped
versions of the full resolution figures which can be found in
http://www.ifca.unican.es/~diego
Trouble for cluster parameter estimation from blind SZ surveys?
(Abriged version) The Sunyaev-Zel'dovich (SZ) effect of galaxy clusters is a
tool to measure three quantities: Compton parameter, electron temperature, and
cluster peculiar velocity. However, a major problem is non-removed
contamination by astrophysical sources that emit in the SZ frequencies. This
includes interstellar dust emission, infra-red (IR) galaxies, and radio sources
in addition to primary Cosmic Microwave Background (CMB) anisotropies. The
three former contaminations induce systematic shifts in the three SZ
parameters. In this study, we carefully estimated, both for a large beam
experiment (namely Planck Surveyor) and a small beam experiment (ACT-like), the
systematic errors that result if a fraction of the expected levels of emission
from dust, IR galaxies, and radio sources remains non-removed. ...Comment: Accepted version (09/03/2005) in press in A&A. Modified content and
title, SPT section remove
Planck intermediate results. III. The relation between galaxy cluster mass and Sunyaev-Zeldovich signal
We examine the relation between the galaxy cluster mass M and
Sunyaev-Zeldovich (SZ) effect signal D_A^2 Y for a sample of 19 objects for
which weak lensing (WL) mass measurements obtained from Subaru Telescope data
are available in the literature. Hydrostatic X-ray masses are derived from
XMM-Newton archive data and the SZ effect signal is measured from Planck
all-sky survey data. We find an M_WL-D_A^2 Y relation that is consistent in
slope and normalisation with previous determinations using weak lensing masses;
however, there is a normalisation offset with respect to previous measures
based on hydrostatic X-ray mass-proxy relations. We verify that our SZ effect
measurements are in excellent agreement with previous determinations from
Planck data. For the present sample, the hydrostatic X-ray masses at R_500 are
on average ~ 20 per cent larger than the corresponding weak lensing masses, at
odds with expectations. We show that the mass discrepancy is driven by a
difference in mass concentration as measured by the two methods, and, for the
present sample, the mass discrepancy and difference in mass concentration is
especially large for disturbed systems. The mass discrepancy is also linked to
the offset in centres used by the X-ray and weak lensing analyses, which again
is most important in disturbed systems. We outline several approaches that are
needed to help achieve convergence in cluster mass measurement with X-ray and
weak lensing observations.Comment: 19 pages, 9 figures, matches accepted versio
Intracellular Serotonin Modulates Insulin Secretion from Pancreatic β-Cells by Protein Serotonylation
Non-neuronal, peripheral serotonin deficiency causes diabetes mellitus and identifies an intracellular role for serotonin in the regulation of insulin secretion
- …