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Confirmation of the VeLLO L1148−IRS: star formation at very low (column) density
Kauffmann, J.,Bertoldi, F.,Bourke, T. L.,Myers, P. C.,Lee, C. W.,Huard, T. L. Blackwell Publishing Ltd 2011 Monthly notices of the Royal Astronomical Society Vol.416 No.3
<P><B>ABSTRACT</B></P><P>We report the detection of a compact (∼5 arcsec; about 1800 au projected size) CO outflow from L1148−IRS. This confirms that this <I>Spitzer</I> source is physically associated with the nearby (≈325 pc) L1148 dense core. Radiative transfer modelling suggests an internal luminosity of 0.08 to 0.13 L<SUB>⊙</SUB>. This validates L1148−IRS as a Very Low Luminosity Object (VeLLO; <I>L</I>≤ 0.1 L<SUB>⊙</SUB>). The L1148 dense core has unusually low densities and column densities for a star‐forming core. It is difficult to understand how L1148−IRS might have formed under these conditions. Independent of the exact final mass of this VeLLO (which is likely <0.24 M<SUB>⊙</SUB>), L1148−IRS and similar VeLLOs might hold some clues about the isolated formation of brown dwarfs.</P>
Chaitanya Sarangapani,Peng Lu,Patrice Behan,Paula Bourke,P.J. Cullen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
In this study an atmospheric air plasma reactor was studied for the degradation of HA and THMs in water. Plasma treatment showed significant breakdown efficacies for HA and THMs. At an applied voltage of 80 kV about 93% of HA and >70% of THMs were degraded after 15 min and 30 min treatment time respectively, with the degradation following a first order kinetic model. Plasma induced reactive species including nitrates and H2O2 were quantified in the treated water. The results of FTIR analysis revealed that the molecular structure of HA was altered by the plasma treatment, with a decrease in aromaticity observed.
Sessile Serrated Adenomas: How to Detect, Characterize and Resect
( Michael X. Ma ),( Michael J. Bourke ) 대한간학회 2017 Gut and Liver Vol.11 No.6
Serrated polyps are important contributors to the burden of colorectal cancers (CRC). These lesions were once consid-ered to have no malignant potential, but currently up to 30% of all CRC are recognized to arise from the serrated neopla-sia pathway. The primary premalignant lesions are sessile serrated adenomas/polyps (SSA/Ps), although traditional serrated adenomas are relatively uncommon. Compared to conventional adenomas, SSA/Ps are morphologically subtle with indistinct borders, may be difficult to detect endoscopi-cally, are more prevalent than previously thought, are as-sociated with synchronous and metachronous advanced neoplasia, and have a higher risk of incomplete resection. Al-though many lesions remain “dormant,” progressive disease is associated with the development of dysplasia and more rapid progression to CRC. As a result, SSA/Ps are strongly implicated in the development of interval cancers. These fac-tors represent unique challenges that require a meticulous approach to their management. In this review, we sum-marize the contemporary literature on the characterization, detection and resection of SSA/Ps. (Gut Liver 2017;11:747-760)
Choi, Yunhee,Lee, Jeong-Eun,Bourke, Tyler L.,II, Neal J. Evans American Astronomical Society 2017 The Astrophysical journal Supplement series Vol.229 No.2
<P>We present observations and analyses of the low-mass star-forming region, Taurus Molecular Cloud-1 (TMC-1). CS (J = 2-1)/N2H+ (J = 1-0) and (CO)-O-17 (J = 2-1)/(CO)-O-18 (J = 2-1) were observed with the. Five College Radio Astronomy Observatory and the. Seoul Radio Astronomy Observatory, respectively. In addition, Spitzer infrared data and 1.2 mm continuum data observed with Max-Planck Millimetre Bolometer are used. We also perform chemical modeling to investigate the relative molecular distributions of the TMC-1 filament. Based on Spitzer observations, there is no young stellar object along the TMC-1 filament, while five Class II and one Class I young stellar objects are identified outside the filament. The comparison between column densities calculated from dust continuum and (CO)-O-17 2-1 line emission shows that CO is depleted much more significantly in the ammonia peak than in the cyanopolyyne peak, while the column densities calculated from the dust continuum are similar at the two peaks. N2H+ is not depleted much in either peak. According to our chemical calculation, the differential chemical distribution in the two peaks can be explained by different timescales required to reach the same density, i.e., by different dynamical processes.</P>