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- 저자 : Lotz, Jennifer M. (검색결과 10 건)
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EVOLUTION OF STAR FORMATION PROPERTIES OF HIGH-REDSHIFT CLUSTER GALAXIES SINCE<i>z</i>= 2
Lee, Seong-Kook,Im, Myungshin,Kim, Jae-Woo,Lotz, Jennifer,McPartland, Conor,Peth, Michael,Koekemoer, Anton IOP Publishing 2015 The Astrophysical journal Vol.810 No.2
<P>Using a stellar mass-limited sample of similar to 46,600 galaxies (M-* > 10(9.1)M(circle dot)) at 0.5 < z < 2, we show that the stellar mass, rather than the environment, is the main parameter controlling quenching of star formation in galaxies with M-* > 10(10)M(circle dot) out to z = 2. On the other hand, the environmental quenching becomes efficient at z < 1 regardless of galaxy mass, and it serves as a main mechanism. for quenching star formation for lower mass galaxies. Our result is based on deep optical and near-infrared imaging data over 2800 arcmin(2), enabling us to negate cosmic variance and identify 46 galaxy cluster candidates with M similar to 10(14) M-circle dot. From M-* similar to 10(9.5) to 10(10.5) M-circle dot, the fraction of quiescent galaxies increases by a factor of similar to 10 over the entire redshift range, but the difference between cluster and field environment is negligible. Rapid evolution in the quiescent fraction is seen from z = 2 to z = 1.3 for massive galaxies, suggesting a build-up of massive quiescent galaxies at z > 1.3. For galaxies with M-circle dot < 10(10)M(circle dot) at z < 1.0, the quiescent fraction is found to be as much as a factor of 2 larger in clusters than in field, showing the importance of environmental quenching in low-mass galaxies at low redshift. Most high-mass galaxies are already quenched at z > 1, therefore environmental quenching does not play a significant role for them, although the efficiency of environmental quenching is nearly identical between high-and low-mass galaxies.</P>
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TIDAL DWARF GALAXIES AROUND A POST-MERGER GALAXY, NGC 4922
Sheen, Yun-Kyeong,Jeong, Hyunjin,Yi, Sukyoung K.,Ferreras, Ignacio,Lotz, Jennifer M.,Olsen, Knut A. G.,Dickinson, Mark,Barnes, Sydney,Park, Jang-Hyun,Ree, Chang H.,Madore, Barry F.,Barlow, Tom A.,Conr American Institute of Physics 2009 The Astronomical journal Vol.138 No.6
<P>One possible channel for the formation of dwarf galaxies involves birth in the tidal tails of interacting galaxies. We report the detection of a bright UV tidal tail and several young tidal dwarf galaxy (TDG) candidates in the post-merger galaxy NGC 4922 in the Coma cluster. Based on a two-component population model (combining young and old stellar populations), we find that the light of tidal tail predominantly comes from young stars (a few Myr old). The Galaxy Evolution Explorer ultraviolet data played a critical role in the parameter (age and mass) estimation. Our stellar mass estimates of the TDG candidates are ~10<SUP>6–7</SUP> M<SUB>☉</SUB>, typical for dwarf galaxies.</P>
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New traits in crops produced by genome editing techniques based on deletions
C. C. M. van de Wiel,J. G. Schaart,L. A. P. Lotz,M. J. M. Smulders 한국식물생명공학회 2017 Plant biotechnology reports Vol.11 No.1
One of the most promising New Plant Breeding Techniques is genome editing (also called gene editing) with the help of a programmable site-directed nuclease (SDN). In this review, we focus on SDN-1, which is the generation of small deletions or insertions (indels) at a precisely defined location in the genome with zinc finger nucleases (ZFN), TALENs, or CRISPR-Cas9. The programmable nuclease is used to induce a double-strand break in the DNA, while the repair is left to the plant cell itself, and mistakes are introduced, while the cell is repairing the double-strand break using the relatively errorprone NHEJ pathway. From a biological point of view, it could be considered as a form of targeted mutagenesis. We first discuss improvements and new technical variants for SDN-1, in particular employing CRISPR-Cas, and subsequently explore the effectiveness of targeted deletions that eliminate the function of a gene, as an approach to generate novel traits useful for improving agricultural sustainability, including disease resistances. We compare them with examples of deletions that resulted in novel functionality as known from crop domestication and classical mutation breeding (both using radiation and chemical mutagens). Finally, we touch upon regulatory and access and benefit sharing issues regarding the plants produced.
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Tidal Dwarf Galaxies around a Post-Merger Galaxy, NGC 4922
Sheen, Yun-Kyeong,Jeong, Hyun-Jin,Yi, Suk-Young K,Ferreras, Ignacio,Lotz, Jennifer M.,Olsen, Knut A.G.,Dickinson, Mark,Barnes, Sydney,Lee, Young-Wook,Park, Jang-Hyun,Ree, Chang-H. 한국우주과학회 2009 한국우주과학회보 Vol.18 No.2
One possible channel for the formation of dwarf galaxies involves birth in the tidal tails of interacting galaxies. We report the detection of a bright UV tidal tail and several young tidal dwarf galaxy candidates in the post-merger galaxy NGC 4922 in the
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