Biomarkers for traumatic brain injury Dambinova, Svetlana A; Dambinova, Svetlana A; Hayes, Ronald L ...
The Royal Society of Chemistry eBooks,
2012., 2012, 2012-05-24, Letnik:
24
eBook
Odprti dostop
Examines current and prospective biomarkers for assessment of traumatic brain injury using a multidisciplinary approach involving biochemistry, molecular biology and clinical chemistry.
Cutaneous malacoplakia Sarkell, B; Dannenberg, M; Blaylock, W K ...
Journal of the American Academy of Dermatology,
05/1994, Letnik:
30, Številka:
5 Pt 2
Journal Article
Recenzirano
Indurated, erythematous plaques of the left arm and left flank developed in a 69-year-old white man with multiorgan failure from Escherichia coli sepsis. Cutaneous malacoplakia was diagnosed. ...Intravenous antibiotic therapy resulted in resolution of the malacoplakia and the E. coli sepsis.
Using the MIPS instrument on Spitzer, we have searched for infrared excesses around a sample of 82 stars, mostly F, G, and K main-sequence field stars, along with a small number of nearby M stars. ...These stars were selected for their suitability for future observations by a variety of planet-finding techniques. These observations provide information on the asteroidal and cometary material orbiting these stars, data that can be correlated with any planets that may eventually be found. We have found significant excess 70 km emission toward 12 stars. Combined with an earlier study, we find an overall 70 km excess detection rate of 13% c 3% for mature cool stars. Unlike the trend for planets to be found preferentially toward stars with high metallicity, the incidence of debris disks is uncorrelated with metallicity. By newly identifying four of these stars as having weak 24 km excesses (fluxes 610% above the stellar photosphere), we confirm a trend found in earlier studies wherein a weak 24 km excess is associated with a strong 70 km excess. Interestingly, we find no evidence for debris disks around 23 stars cooler than K1, a result that is bolstered by a lack of excess around any of the 38 K1-M6 stars in two companion surveys. One motivation for this study is the fact that strong zodiacal emission can make it hard or impossible to detect planets directly with future observatories such as the Terrestrial Planet Finder (TPF). The observations reported here exclude a few stars with very high levels of emission, >1000 times the emission of our zodiacal cloud, from direct planet searches. For the remainder of the sample, we set relatively high limits on dust emission from asteroid belt counterparts.
Congenital ptosis in humans has been associated with anisometropia, myopia, astigmatism, and amblyopia. Scientific evidence has shown that visual deprivation causes axial myopia in animals. This ...study using chicks was undertaken to investigate an animal model of congenital ptosis and the effects of lid position on ocular development. Eyelid ptosis was surgically induced in one eye each of white leghorn chickens within 48 hours after hatching. The chicks were raised under natural diurnal lighting. Thirty days after inducing ptosis, the chicks were killed and their eyes enucleated and photographed in a sagittal view. Computerized image analysis was used to measure the size of the globe along five axes. Globe size was significantly greater in the superior part of eyes with ptosis compared with control eyes. No other measurement differences were significant (p < 0.01). Thus, this study demonstrates that regional axial myopia is induced by eyelid ptosis in chicks.
Intrauterine-acquired neonatal herpes simplex virus infection is a severe, often life-threatening infection that has a wide spectrum of clinical presentations. We describe a 31-week-gestation male ...who had a rarely reported epidermolysis bullosa-like clinical presentation. He acquired herpes simplex virus type II in utero secondary to a primary maternal infection that occurred on the knee. A review of the infection, the need for early therapy, and the prognosis are presented.
Debris Disks around Sun-like Stars Trilling, D. E; Bryden, G; Beichman, C. A ...
Astrophysical journal/The Astrophysical journal,
02/2008, Letnik:
674, Številka:
2
Journal Article
Recenzirano
Odprti dostop
We have observed nearly 200 FGK stars at 24 and 70 mu m with the Spitzer Space Telescope. We identify excess infrared emission, including a number of cases where the observed flux is more than 10 ...times brighter than the predicted photospheric flux, and interpret these signatures as evidence of debris disks in those systems. We combine this sample of FGK stars with similar published results to produce a sample of more than 350 main sequence AFGKM stars. The incidence of debris disks is 4.2 super(+) sub(-) super(2) sub(1) super(.) sub(.) super(0) sub(1)% at 24 mu m for a sample of 213 Sun-like (FG) stars and 16.4 super(+) sub(2) super(2) sub(.) super(.) sub(9) super(8-)% at 70 mu m for 225 Sun-like (FG) stars. We find that the excess rates for A, F, G, and K stars are statistically indistinguishable, but with a suggestion of decreasing excess rate toward the later spectral types; this may be an age effect. The lack of strong trend among FGK stars of comparable ages is surprising, given the factor of 50 change in stellar luminosity across this spectral range. We also find that the incidence of debris disks declines very slowly beyond ages of 1 billion years.
We analyze a sample of 62600 Spitzer MIPS 24 km sources brighter than 680 kJy and located in the Chandra Deep Field-South to characterize the evolution of the comoving infrared (IR) energy density of ...the universe up to z 6 1. Using published ancillary optical data, we first obtain a nearly complete redshift determination for the 24 km objects associated with R 24 mag counterparts at z 1. These sources represent 655%-60% of the total MIPS 24 km population with f sub(24)k sub(m) 80 kJy, the rest of the sample likely lying at higher redshifts. We then determine an estimate of their total IR luminosities using various libraries of IR spectral energy distributions. We find that the 24 km population at 0.5 z 1 is dominated by "luminous infrared galaxies" (i.e., 10 super(11) L sub( ), L sub(IR) , 10 super(12) L sub( )), the counterparts of which appear to be also luminous at optical wavelengths and tend to be more massive than the majority of optically selected galaxies. A significant number of fainter sources (5 x 10 super(10) L sub( )L sub(IR) , 10 super(11) L sub( ))are also detected at similar distances. We finally derive 15 km and total IR luminosity functions (LFs) up to z 6 1. In agreement with the previous results from the Infrared Space Observatory (ISO) and SCUBA and as expected from the MIPS source number counts, we find very strong evolution of the contribution of the IR-selected population with look-back time. Pure evolution in density is firmly excluded by the data, but we find considerable degeneracy between strict evolution in luminosity and a combination of increases in both density and luminosity L IR a (1 + z) super(3.2) super(+) sub(-) super(0) sub(0) super(.) sub(.) super(7) sub(2) hIR a (1 + z) super(0.7) super(+) sub(-) super(0) sub(0) super(.) sub(.) super(6) sub(2). A significant steepening of the faint-end slope of the IR luminosity function is also unlikely, as it would overproduce the faint 24 km source number counts. Our results imply that the comoving IR energy density of the universe evolves as (1 + z) super(3.9c0.4) up to z 6 1 and that galaxies luminous in the infrared (i.e., L sub(IR) . 10 super(11) L sub( )) are responsible for 70% c 15% of this energy density at z 6 1. Taking into account the contribution of the UV luminosity evolving as (1 + z)6 super(2.5), we infer that these IR-luminous sources dominate the star-forming activity beyond z 6 0.7. The uncertainties affecting these conclusions are largely dominated by the errors in the k-corrections used to convert 24 km fluxes into luminosities.
Using the MIPS camera on the Spitzer Space Telescope, we have searched for debris disks around 104 stars known from radial velocity studies to have one or more planets. Combining this new data with ...42 already published observations of planet-bearing stars, we find that 14 of the 146 systems have IR excess at 24 and/or 70 Delta *mm. Only one star, HD 69830, has IR excess exclusively at 24 Delta *mm, indicative of warm dust in the inner system analogous to that produced by collisions in the solar system's asteroid belt. For the other 13 stars with IR excess the emission is stronger at 70 Delta *mm, consistent with cool dust (<100 K) located beyond 10 AU, well outside of the orbital location of the known planets. Selection effects inhibit detection of faint disks around the planet-bearing stars (e.g., the stars tend to be more distant), resulting in a lower detection rate for IR excess than in a corresponding control sample of nearby stars not known to have planets (9% +/- 3% versus 14% +/- 3%). Even taking into account the selection bias, we find that the difference between the dust emission around stars with planets and stars without known planets is not statistically significant.
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