1,893 research outputs found
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MGS accelerometer data analysis with the LMD GCM
Mars Global Surveyor aerobreaking phases, required to
achieve its mapping orbit, have yielded vertical profiles
of thermospheric densities, scale heights and temperatures
covering a broad range of local times, seasons and
spatial coordinates [Keating et al. 1998, 2001]. Phase
I covered local times from 11 to 16 h (assuming 24
"martian hours” per martian day or sols), with a latitude
coverage of approximately 40deg to 60deg N. Seasons
observed during this phase were centered around winter
solstice and altitudes of periapsis range from 115 to
135 km. The altitudes for Phase II were lower, with a
minimum around 100 km and a maximum around 120.
Martian spring was the season covered during this phase
and the local time was between 15 and 16 h. The latitude
covered by Phase II, however, was more extense
than that seen during Phase I, with a coverage from 60deg N
to basically the South Pole
Chapter 15: Vulnerability of marine reptiles in the Great Barrier Reef to climate change
Marine reptiles are an important and well-documented component of the Great Barrier Reef (GBR),
comprising a single species of crocodile (Crocodylidae), six species of marine turtles (five Chelonidae
and one Dermochelyidae), at least 16 species of sea snakes (Hydrophiidae), one species of file
snake (Acrochordidae) and one species of mangrove snake (Colubridae). Together these marine
reptile species inhabit or traverse through each of the 70 bioregions identified by the Great Barrier
Reef Marine Park Authority Representative Areas Program . These marine reptile species, with the
exception of some of the snakes, have distributions that span large areas of the GBR. Crocodiles,
marine turtles, file snakes, mangrove snakes and sea snakes all have life history traits, behaviour and
physiology that are strongly influenced by temperature. All are ectothermic except for the leatherback
turtle and thus their body temperatures fluctuate with environmental temperature. For egg laying
species (crocodiles and turtles), the temperature of the nest determines incubation period, hatching
success and hatching sex ratio. Thus as a group they are potentially vulnerable to climate change.This is Chapter 15 of Climate change and the Great Barrier Reef: a vulnerability assessment. The entire book can be found at http://hdl.handle.net/11017/13
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Towards a global model of the martian atmosphere
In an effort to continuously improve the capabilities of the Martian atmospheric predictions at LMD, the GCM has been extended into thermospheric heights thus creating the first model to self-consistently couple the lower and upper
regions of the Martian atmosphere. The behaviour of
the Martian thermosphere is strongly influenced by
lower atmospheric processes and has complex dynamics.
Such a fully coupled model will certainly aid in the preparation of future missions and on the analysis of future high altitude data, as well as serve as a base for the simulation of ionospheric processes, escape, etc
Ancient Egypt 1921 Part 2
Part 2 of the 1921 Ancient Egypt books. Contents include the British school in Egypt, origins of some signs, borders of lotus and grapes, the head of a barbarian, the transmission of history, and a cartouche of Augustus.https://knowledge.e.southern.edu/kweeks_coll/1015/thumbnail.jp
Inability to sustain intraphagolysosomal killing of Staphylococcus aureus predisposes to bacterial persistence in macrophages
Macrophages are critical effectors of the early innate response to bacteria in tissues. Phagocytosis and killing of bacteria are interrelated functions essential for bacterial clearance but the rate-limiting step when macrophages are challenged with large numbers of the major medical pathogen Staphylococcus aureus is unknown. We show that macrophages have a finite capacity for intracellular killing and fail to match sustained phagocytosis with sustained microbial killing when exposed to large inocula of S. aureus (Newman, SH1000 and USA300 strains). S. aureus ingestion by macrophages is associated with a rapid decline in bacterial viability immediately after phagocytosis. However, not all bacteria are killed in the phagolysosome, and we demonstrate reduced acidification of the phagolysosome, associated with failure of phagolysosomal maturation and reduced activation of cathepsin D. This results in accumulation of viable intracellular bacteria in macrophages. We show macrophages fail to engage apoptosis-associated bacterial killing. Ultittop mately macrophages with viable bacteria undergo cell lysis, and viable bacteria are released and can be internalized by other macrophages. We show that cycles of lysis and reuptake maintain a pool of viable intracellular bacteria over time when killing is overwhelmed and demonstrate intracellular persistence in alveolar macrophages in the lungs in a murine model
Spectral properties of the one-dimensional two-channel Kondo lattice model
We have studied the energy spectrum of a one-dimensional Kondo lattice, where
the localized magnetic moments have SU(N) symmetry and two channels of
conduction electrons are present. At half filling, the system is shown to exist
in two phases: one dominated by RKKY-exchange interaction effects, and the
other by Kondo screening. A quantum phase transition point separates these two
regimes at temperature . The Kondo-dominated phase is shown to possess
soft modes, with spectral gaps much smaller than the Kondo temperature.Comment: 4 pages + 2 figures. Submitted for publicatio
The UKIDSS Galactic Plane Survey
'The definitive version is available at www.blackwell-synergy.com .' Copyright Blackwell Publishing DOI: 10.1111/j.1365-2966.2008.13924.xThe UKIDSS Galactic Plane Survey (GPS) is one of the five near-infrared Public Legacy Surveys that are being undertaken by the UKIDSS consortium, using the Wide Field Camera on the United Kingdom Infrared TelescopePeer reviewe
Optical Spectra of SNR Candidates in NGC 300
We present moderate-resolution (<5A) long-slit optical spectra of 51 nebular
objects in the nearby Sculptor Group galaxy NGC 300 obtained with the 2.3 meter
Advanced Technology Telescope at Siding Spring Observatory, Australia. Adopting
the criterion of [SII]/Ha>=0.4 to confirm supernova remnants (SNRs) from
optical spectra, we find that of 28 objects previously proposed as SNRs from
optical observations, 22 meet this criterion with six showing [SII]/Ha of less
than 0.4. Of 27 objects suggested as SNRs from radio data, four are associated
with the 28 previously proposed SNRs. Of these four, three (included in the 22
above) meet the criterion. In all, 22 of the 51 nebular objects meet the
[SII]/Ha criterion as SNRs while the nature of the remaining 29 objects remains
undetermined by these observations.Comment: Accepted for publication in Astrophysics & Space Scienc
Parafermionic polynomials, Selberg integrals and three-point correlation function in parafermionic Liouville field theory
In this paper we consider parafermionic Liouville field theory. We study
integral representations of three-point correlation functions and develop a
method allowing us to compute them exactly. In particular, we evaluate the
generalization of Selberg integral obtained by insertion of parafermionic
polynomial. Our result is justified by different approach based on dual
representation of parafermionic Liouville field theory described by
three-exponential model
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