4,678 research outputs found
High Density Molecular Gas in the IR-bright Galaxy System VV114
New high resolution CO(3-2) interferometric map of the IR-bright interacting
galaxy system VV114 observed with the Submillimeter Array (SMA) reveal a
substantial amount of warm and dense gas in the IR-bright but optically
obscured galaxy, VV114E, and the overlap region connecting the two nuclei. A
1.8 x 1.4 kpc concentration of CO(3-2) emitting gas with a total mass of 4 x
10^9 Msun coincides with the peaks of NIR, MIR, and radio continuum emission
found previously by others, identifying the dense fuel for the AGN and/or the
starburst activity there. Extensive CO(2-1) emission is also detected,
revealing detailed distribution and kinematics that are consistent with the
earlier CO(1-0) results. The widely distributed molecular gas traced in CO(2-1)
and the distributed discrete peaks of CO(3-2) emission suggest that a spatially
extended intense starbursts may contribute significantly to its large IR
luminosity. These new observations further support the notion that VV114 is
approaching its final stage of merger, when violent central inflow of gas
triggers intense starburst activity possibly boosting the IR luminosity above
the ultraluminous threshold.Comment: 11 pages, 2 figures, accepted for publication in ApJ
The Dynamics of Molecular Material Within 15 pcs of the Galactic Center
We report the results of a 5-field mosaic of the central 15pc of the Galaxy
in the (1,1) and (2,2) lines of NH3. Two narrow filaments or streamers are seen
running parallel to the Galactic plane. The southern streamer appears to carry
gas directly toward the nuclear region from the 20 km/s cloud. The eastern
streamer, which we will denote the molecular ridge, appears to be the denser
part of the 50 km/s cloud which lies immediately east of the Sgr A East complex
and extends in the south towards the 20 km/s cloud. This ridge of gas carries
the kinematical signatures of interactions with Sgr A East as well as a SNR
which lies south of the Galactic center. The bulk motion of the gas, the
enhanced line widths, and the heating of the molecular material all suggest an
active evolutionary phase for the gas immediately adjacent to the nucleus.Comment: 11 pages, 13 figures, to appear in The Astrophysical Journa
Effect of cardiac history upon the accuracy of acute myocardial infarction diagnosis by electrocardiogram in candidates for out-of-hospital thrombolysis
Analysis of state laws on informed consent for clinical genetic testing in the era of genomic sequencing
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143694/1/ajmgc31608_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/143694/2/ajmgc31608.pd
Kinematics of the Broad-line Region of 3C 273 from a Ten-year Reverberation Mapping Campaign
Despite many decades of study, the kinematics of the broad-line region of
3C~273 are still poorly understood. We report a new, high signal-to-noise,
reverberation mapping campaign carried out from November 2008 to March 2018
that allows the determination of time lags between emission lines and the
variable continuum with high precision. The time lag of variations in H
relative to those of the 5100 Angstrom continuum is days
in the rest frame, which agrees very well with the Paschen- region
measured by the GRAVITY at The Very Large Telescope Interferometer. The time
lag of the H emission line is found to be nearly the same as for
H. The lag of the Fe II emission is days, longer
by a factor of 2 than that of the Balmer lines. The velocity-resolved lag
measurements of the H line show a complex structure which can be
possibly explained by a rotation-dominated disk with some inflowing radial
velocity in the H-emitting region. Taking the virial factor of , we derive a BH mass of and an accretion rate of from the
H line. The decomposition of its images yields a host stellar mass
of , and a ratio of in agreement with the Magorrian relation. In the near
future, it is expected to compare the geometrically-thick BLR discovered by the
GRAVITY in 3C 273 with its spatially-resolved torus in order to understand the
potential connection between the BLR and the torus.Comment: 17 pages, 12 figures, 6 tables, accepted for publication in The
Astrophysical Journa
Effects of various sugars added to growth and drying media upon thermotolerance and survival throughout storage of freeze-dried lactobacillus delbrueckii ssp. bulgaricus
The aim of this research effort was to investigate the role of various sugar substrates
in the growth medium upon thermotolerance and upon survival during storage after
freeze-drying of Lactobacillus bulgaricus. Addition of the sugars tested to the growth
medium, and of these and sorbitol to the drying medium (skim milk) was investigated
so as to determine whether a relationship exists between growth and drying media,
in terms of protection of freeze-dried cells throughout storage. The lowest decrease in
viability of L. bulgaricus cells after freeze-drying was obtained when that organism
was grown in the presence of mannose. However, L. bulgaricus clearly survived better
during storage when cells had been grown in the presence of fructose, lactose or
mannose rather than glucose (the standard sugar in the growth medium). A similar
effect could not be observed in terms of thermotolerance; in this case, the growth
medium supplemented with lactose was found to yield cells bearing the highest heat
resistance. Supplementation of the drying medium with glucose, fructose, lactose,
mannose or sorbitol led in most cases to enhancement of protection during storage, to
a degree that was growth medium-dependent
Relevant factors for the preparation of freeze-dried lactic acid
The industrial exploitation of lactic acid bacteria (LAB) as starter and/or probiotic cultures depends strongly on the preservation
technologies employed, which are required to guarantee long-term delivery of stable cultures in terms of viability and activity.
Freeze-dried preparations exhibit advantages relative to preparations made with other techniques in terms of long-term
preservation, coupled with convenience in handling, storage, marketing and application. Degrees of survival of LAB cultures as high
as possible, during drying and subsequent storage, are thus of nuclear importance, both technologically and economically.
This review covers several factors, deemed relevant for preservation of freeze-dried LAB. The state of the art of the knowledge
focussed on the improvement of LAB survival during freeze-drying and subsequent storage is presented, including specific discussion
of the effects of (i) intrinsic factors, (ii) growth factors, (iii) sub-lethal treatments, (iv) drying media and (v) storage and rehydration
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