472 results on '"Peter J Brown"'
Search Results
2. A chemical probe of CARM1 alters epigenetic plasticity against breast cancer cell invasion
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Xiao-Chuan Cai, Tuo Zhang, Eui-jun Kim, Ming Jiang, Ke Wang, Junyi Wang, Shi Chen, Nawei Zhang, Hong Wu, Fengling Li, Carlo C dela Seña, Hong Zeng, Victor Vivcharuk, Xiang Niu, Weihong Zheng, Jonghan P Lee, Yuling Chen, Dalia Barsyte, Magda Szewczyk, Taraneh Hajian, Glorymar Ibáñez, Aiping Dong, Ludmila Dombrovski, Zhenyu Zhang, Haiteng Deng, Jinrong Min, Cheryl H Arrowsmith, Linas Mazutis, Lei Shi, Masoud Vedadi, Peter J Brown, Jenny Xiang, Li-Xuan Qin, Wei Xu, and Minkui Luo
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PRMT ,methylation ,epigenetic ,inhibitor ,single cell ,mechanism ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
CARM1 is a cancer-relevant protein arginine methyltransferase that regulates many aspects of transcription. Its pharmacological inhibition is a promising anti-cancer strategy. Here SKI-73 (6a in this work) is presented as a CARM1 chemical probe with pro-drug properties. SKI-73 (6a) can rapidly penetrate cell membranes and then be processed into active inhibitors, which are retained intracellularly with 10-fold enrichment for several days. These compounds were characterized for their potency, selectivity, modes of action, and on-target engagement. SKI-73 (6a) recapitulates the effect of CARM1 knockout against breast cancer cell invasion. Single-cell RNA-seq analysis revealed that the SKI-73(6a)-associated reduction of invasiveness acts by altering epigenetic plasticity and suppressing the invasion-prone subpopulation. Interestingly, SKI-73 (6a) and CARM1 knockout alter the epigenetic plasticity with remarkable difference, suggesting distinct modes of action for small-molecule and genetic perturbations. We therefore discovered a CARM1-addiction mechanism of cancer metastasis and developed a chemical probe to target this process.
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- 2019
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3. Hyperplastic and fibrosing gastropathy resembling Ménétrier disease in a cat
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Emi N Barker, Andrew S Holdsworth, Angie Hibbert, Peter J Brown, and Nicolette J Hayward
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Veterinary medicine ,SF600-1100 - Abstract
Case summary A 3.5-year-old domestic shorthair cat presented with a 6 month history of weight loss and polyphagia. Clinical examination revealed a markedly reduced body condition score (2/9) and a quiet demeanour. Laboratory abnormalities comprised a mild non-regenerative anaemia, stress leukogram, hypoproteinaemia due to hypoalbuminaemia, azotaemia, hypokalaemia, total hypocalcaemia and sub-maximally concentrated urine (specific gravity 1.020). Abdominal ultrasonography revealed marked thickening of the gastric mucosa within the fundus, body and pylorus; the most dorsal portion of the fundus was spared. The thickened mucosa contained multiple small, anechoic cyst-like structures. The gastric submucosa, muscularis and serosa appeared normal. Histopathology, performed on a full-thickness gastric biopsy, revealed mucosal hypertrophy and markedly dilated gastric glands in areas; not all gastric glands were affected, with some appearing normal or atrophic. Focal interstitial fibrosis was present in some areas. The findings of hypoproteinaemia, gastric ultrasonographic changes and histopathology results share several similarities to those reported with Ménétrier disease. Relevance and novel information Ménétrier disease is a rare condition of the stomach in humans. A similar condition, giant hypertrophic gastritis (or Ménétrier-like disease), has also been described rarely in dogs. To our knowledge, Ménétrier-like disease has not been previously described cats. This case shares features of Ménétrier-like disease, raising the suspicion of a similar aetiopathogenesis.
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- 2019
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4. The dynamic conformational landscape of the protein methyltransferase SETD8
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Shi Chen, Rafal P Wiewiora, Fanwang Meng, Nicolas Babault, Anqi Ma, Wenyu Yu, Kun Qian, Hao Hu, Hua Zou, Junyi Wang, Shijie Fan, Gil Blum, Fabio Pittella-Silva, Kyle A Beauchamp, Wolfram Tempel, Hualiang Jiang, Kaixian Chen, Robert J Skene, Yujun George Zheng, Peter J Brown, Jian Jin, Cheng Luo, John D Chodera, and Minkui Luo
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epigenetics ,posttranslational modification ,enzymology ,computational chemistry ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
Elucidating the conformational heterogeneity of proteins is essential for understanding protein function and developing exogenous ligands. With the rapid development of experimental and computational methods, it is of great interest to integrate these approaches to illuminate the conformational landscapes of target proteins. SETD8 is a protein lysine methyltransferase (PKMT), which functions in vivo via the methylation of histone and nonhistone targets. Utilizing covalent inhibitors and depleting native ligands to trap hidden conformational states, we obtained diverse X-ray structures of SETD8. These structures were used to seed distributed atomistic molecular dynamics simulations that generated a total of six milliseconds of trajectory data. Markov state models, built via an automated machine learning approach and corroborated experimentally, reveal how slow conformational motions and conformational states are relevant to catalysis. These findings provide molecular insight on enzymatic catalysis and allosteric mechanisms of a PKMT via its detailed conformational landscape.
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- 2019
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5. Donated chemical probes for open science
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Susanne Müller, Suzanne Ackloo, Cheryl H Arrowsmith, Marcus Bauser, Jeremy L Baryza, Julian Blagg, Jark Böttcher, Chas Bountra, Peter J Brown, Mark E Bunnage, Adrian J Carter, David Damerell, Volker Dötsch, David H Drewry, Aled M Edwards, James Edwards, Jon M Elkins, Christian Fischer, Stephen V Frye, Andreas Gollner, Charles E Grimshaw, Adriaan IJzerman, Thomas Hanke, Ingo V Hartung, Steve Hitchcock, Trevor Howe, Terry V Hughes, Stefan Laufer, Volkhart MJ Li, Spiros Liras, Brian D Marsden, Hisanori Matsui, John Mathias, Ronan C O'Hagan, Dafydd R Owen, Vineet Pande, Daniel Rauh, Saul H Rosenberg, Bryan L Roth, Natalie S Schneider, Cora Scholten, Kumar Singh Saikatendu, Anton Simeonov, Masayuki Takizawa, Chris Tse, Paul R Thompson, Daniel K Treiber, Amélia YI Viana, Carrow I Wells, Timothy M Willson, William J Zuercher, Stefan Knapp, and Anke Mueller-Fahrnow
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Chemical probes ,Target validation ,Open Science ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
Potent, selective and broadly characterized small molecule modulators of protein function (chemical probes) are powerful research reagents. The pharmaceutical industry has generated many high-quality chemical probes and several of these have been made available to academia. However, probe-associated data and control compounds, such as inactive structurally related molecules and their associated data, are generally not accessible. The lack of data and guidance makes it difficult for researchers to decide which chemical tools to choose. Several pharmaceutical companies (AbbVie, Bayer, Boehringer Ingelheim, Janssen, MSD, Pfizer, and Takeda) have therefore entered into a pre-competitive collaboration to make available a large number of innovative high-quality probes, including all probe-associated data, control compounds and recommendations on use (https://openscienceprobes.sgc-frankfurt.de/). Here we describe the chemical tools and target-related knowledge that have been made available, and encourage others to join the project.
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- 2018
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6. Hemi-methylated DNA regulates DNA methylation inheritance through allosteric activation of H3 ubiquitylation by UHRF1
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Joseph S Harrison, Evan M Cornett, Dennis Goldfarb, Paul A DaRosa, Zimeng M Li, Feng Yan, Bradley M Dickson, Angela H Guo, Daniel V Cantu, Lilia Kaustov, Peter J Brown, Cheryl H Arrowsmith, Dorothy A Erie, Michael B Major, Rachel E Klevit, Krzysztof Krajewski, Brian Kuhlman, Brian D Strahl, and Scott B Rothbart
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DNA methylation ,ubiquitin ,histone post-translational modifications ,UHRF1 ,ubiquitylation ,epigenetics ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
The epigenetic inheritance of DNA methylation requires UHRF1, a histone- and DNA-binding RING E3 ubiquitin ligase that recruits DNMT1 to sites of newly replicated DNA through ubiquitylation of histone H3. UHRF1 binds DNA with selectivity towards hemi-methylated CpGs (HeDNA); however, the contribution of HeDNA sensing to UHRF1 function remains elusive. Here, we reveal that the interaction of UHRF1 with HeDNA is required for DNA methylation but is dispensable for chromatin interaction, which is governed by reciprocal positive cooperativity between the UHRF1 histone- and DNA-binding domains. HeDNA recognition activates UHRF1 ubiquitylation towards multiple lysines on the H3 tail adjacent to the UHRF1 histone-binding site. Collectively, our studies are the first demonstrations of a DNA-protein interaction and an epigenetic modification directly regulating E3 ubiquitin ligase activity. They also define an orchestrated epigenetic control mechanism involving modifications both to histones and DNA that facilitate UHRF1 chromatin targeting, H3 ubiquitylation, and DNA methylation inheritance.
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- 2016
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7. Structure of the catalytic domain of EZH2 reveals conformational plasticity in cofactor and substrate binding sites and explains oncogenic mutations.
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Hong Wu, Hong Zeng, Aiping Dong, Fengling Li, Hao He, Guillermo Senisterra, Alma Seitova, Shili Duan, Peter J Brown, Masoud Vedadi, Cheryl H Arrowsmith, and Matthieu Schapira
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Medicine ,Science - Abstract
Polycomb repressive complex 2 (PRC2) is an important regulator of cellular differentiation and cell type identity. Overexpression or activating mutations of EZH2, the catalytic component of the PRC2 complex, are linked to hyper-trimethylation of lysine 27 of histone H3 (H3K27me3) in many cancers. Potent EZH2 inhibitors that reduce levels of H3K27me3 kill mutant lymphoma cells and are efficacious in a mouse xenograft model of malignant rhabdoid tumors. Unlike most SET domain methyltransferases, EZH2 requires PRC2 components, SUZ12 and EED, for activity, but the mechanism by which catalysis is promoted in the PRC2 complex is unknown. We solved the 2.0 Å crystal structure of the EZH2 methyltransferase domain revealing that most of the canonical structural features of SET domain methyltransferase structures are conserved. The site of methyl transfer is in a catalytically competent state, and the structure clarifies the structural mechanism underlying oncogenic hyper-trimethylation of H3K27 in tumors harboring mutations at Y641 or A677. On the other hand, the I-SET and post-SET domains occupy atypical positions relative to the core SET domain resulting in incomplete formation of the cofactor binding site and occlusion of the substrate binding groove. A novel CXC domain N-terminal to the SET domain may contribute to the apparent inactive conformation. We propose that protein interactions within the PRC2 complex modulate the trajectory of the post-SET and I-SET domains of EZH2 in favor of a catalytically competent conformation.
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- 2013
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8. 1991T-like Supernovae*
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M. M. Phillips, C. Ashall, Peter J. Brown, L. Galbany, M. A. Tucker, Christopher R. Burns, Carlos Contreras, P. Hoeflich, E. Y. Hsiao, S. Kumar, Nidia Morrell, Syed A. Uddin, E. Baron, Wendy L. Freedman, Kevin Krisciunas, S. E. Persson, Anthony L. Piro, B. J. Shappee, Maximilian Stritzinger, Nicholas B. Suntzeff, Sudeshna Chakraborty, R. P. Kirshner, J. Lu, G. H. Marion, Abigail Polin, and M. Shahbandeh
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- 2024
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9. Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi
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Manisha Shrestha, K. Azalee Bostroem, David J. Sand, Griffin Hosseinzadeh, Jennifer E. Andrews, Yize Dong, Emily Hoang, Daryl Janzen, Jeniveve Pearson, Jacob E. Jencson, M. J. Lundquist, Darshana Mehta, Aravind P. Ravi, Nicolás Meza Retamal, Stefano Valenti, Peter J. Brown, Saurabh W. Jha, Colin Macrie, Brian Hsu, Joseph Farah, D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Lindsey Kwok, Nathan Smith, Michaela Schwab, Aidan Martas, Ricardo R. Munoz, Gustavo E. Medina, Ting S. Li, Paula Diaz, Daichi Hiramatsu, Brad E. Tucker, J. C. Wheeler, Xiaofeng Wang, Qian Zhai, Jujia Zhang, Anjasha Gangopadhyay, Yi Yang, and Claudia P. Gutiérrez
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Core-collapse supernovae ,Type II supernovae ,Red supergiant stars ,Stellar mass loss ,Circumstellar matter ,Astrophysics ,QB460-466 - Abstract
We present high-cadence photometric and spectroscopic observations of supernova (SN) 2024ggi, a Type II SN with flash spectroscopy features, which exploded in the nearby galaxy NGC 3621 at ∼7 Mpc. The light-curve evolution over the first 30 hr can be fit by two power-law indices with a break after 22 hr, rising from M _V ≈ −12.95 mag at +0.66 day to M _V ≈ −17.91 mag after 7 days. In addition, the densely sampled color curve shows a strong blueward evolution over the first few days and then behaves as a normal SN II with a redward evolution as the ejecta cool. Such deviations could be due to interaction with circumstellar material (CSM). Early high- and low-resolution spectra clearly show high-ionization flash features from the first spectrum to +3.42 days after the explosion. From the high-resolution spectra, we calculate the CSM velocity to be 37 ± 4 km s ^−1 . We also see the line strength evolve rapidly from 1.22 to 1.49 days in the earliest high-resolution spectra. Comparison of the low-resolution spectra with CMFGEN models suggests that the pre-explosion mass-loss rate of SN 2024ggi falls in the range of 10 ^−3 –10 ^−2 M _☉ yr ^−1 , which is similar to that derived for SN 2023ixf. However, the rapid temporal evolution of the narrow lines in the spectra of SN 2024ggi ( R _CSM ∼ 2.7 × 10 ^14 cm) could indicate a smaller spatial extent of the CSM than in SN 2023ixf ( R _CSM ∼ 5.4 × 10 ^14 cm), which in turn implies a lower total CSM mass for SN 2024ggi.
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- 2024
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10. Discovery of a Novel DCAF1 Ligand Using a Drug-Target Interaction Prediction Model: Generalizing Machine Learning to New Drug Targets.
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Serah W. Kimani, Julie Owen, Stuart R. Green, Fengling Li, Yanjun Li, Aiping Dong, Peter J. Brown, Suzanne Ackloo, David Kuter, Cindy Yang, Miranda Macaskill, Stephen Scott Mackinnon, Cheryl H. Arrowsmith, Matthieu Schapira, Vijay Shahani, and Levon Halabelian
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- 2023
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11. Artificial Intelligence Assisted Inversion (AIAI): Quantifying the Spectral Features of 56Ni of Type Ia Supernovae
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Xingzhuo Chen, Lifan Wang, Lei Hu, and Peter J. Brown
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Type Ia supernovae ,Convolutional neural networks ,Astrophysics ,QB460-466 - Abstract
Following our previous study of Artificial Intelligence Assisted Inversion (AIAI) of supernova analyses, we train a set of deep neural networks based on the 1D radiative transfer code TARDIS to simulate the optical spectra of Type Ia supernovae (SNe Ia) between 10 and 40 days after the explosion. The neural networks are applied to derive the mass of ^56 Ni in velocity ranges above the photosphere for a sample of 124 well-observed SNe Ia in the TARDIS model context. A subset of the SNe have multi-epoch observations for which the decay of the radioactive ^56 Ni can be used to test the AIAI quantitatively. The ^56 Ni mass derived from AIAI using the observed spectra as inputs for this subset agrees with the radioactive decay rate of ^56 Ni. AIAI reveals that a spectral signature near 3890 Å is related to the Ni ii 4067Å line, and the ^56 Ni mass deduced from AIAI is found to be correlated with the light-curve shapes of SNe Ia, with SNe Ia with broader light curves showing larger ^56 Ni mass in the envelope above the photosphere. AIAI enables spectral data of SNe to be quantitatively analyzed under theoretical frameworks based on well-defined physical assumptions.
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- 2024
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12. Extrapolation of Type Ia Supernova Spectra into the Near-infrared Using Principal Component Analysis
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Anthony Burrow, E. Baron, Christopher R. Burns, Eric Y. Hsiao, Jing Lu, Chris Ashall, Peter J. Brown, James M. DerKacy, G. Folatelli, Lluís Galbany, P. Hoeflich, Kevin Krisciunas, N. Morrell, M. M. Phillips, Benjamin J. Shappee, Maximilian D. Stritzinger, and Nicholas B. Suntzeff
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Type Ia supernovae ,Astrophysics ,QB460-466 - Abstract
We present a method of extrapolating the spectroscopic behavior of Type Ia supernovae (SNe Ia) in the near-infrared (NIR) wavelength regime up to 2.30 μ m using optical spectroscopy. Such a process is useful for accurately estimating K-corrections and other photometric quantities of SNe Ia in the NIR. A principal component analysis is performed on data consisting of Carnegie Supernova Project I & II optical and NIR FIRE spectra to produce models capable of making these extrapolations. This method differs from previous spectral template methods by not parameterizing models strictly by photometric light-curve properties of SNe Ia, allowing for more flexibility of the resulting extrapolated NIR flux. A difference of around −3.1% to −2.7% in the total integrated NIR flux between these extrapolations and the observations is seen here for most test cases including Branch core-normal and shallow-silicon subtypes. However, larger deviations from the observation are found for other tests, likely due to the limited high-velocity and broad-line SNe Ia in the training sample. Maximum-light principal components are shown to allow for spectroscopic predictions of the color-stretch light-curve parameter, s _BV , within approximately ±0.1 units of the value measured with photometry. We also show these results compare well with NIR templates, although in most cases the templates are marginally more fitting to observations, illustrating a need for more concurrent optical+NIR spectroscopic observations to truly understand the diversity of SNe Ia in the NIR.
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- 2024
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13. Carnegie Supernova Project I and II: Measurements of H 0 Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae
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Syed A. Uddin, Christopher R. Burns, M M. Phillips, Nicholas B. Suntzeff, Wendy L. Freedman, Peter J. Brown, Nidia Morrell, Mario Hamuy, Kevin Krisciunas, Lifan Wang, Eric Y. Hsiao, Ariel Goobar, Saul Perlmutter, Jing Lu, Maximilian Stritzinger, Joseph P. Anderson, Chris Ashall, Peter Hoeflich, Benjamin J. Shappee, S. E. Persson, Anthony L. Piro, E Baron, Carlos Contreras, Lluís Galbany, Sahana Kumar, Melissa Shahbandeh, Scott Davis, Jorge Anais, Luis Busta, Abdo Campillay, Sergio Castellón, Carlos Corco, Tiara Diamond, Christa Gall, Consuelo Gonzalez, Simon Holmbo, Miguel Roth, Jacqueline Serón, Francesco Taddia, Simón Torres, Charles Baltay, Gastón Folatelli, Ellie Hadjiyska, Mansi Kasliwal, Peter E. Nugent, David Rabinowitz, and Stuart D. Ryder
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Type Ia supernovae ,Distance indicators ,Observational cosmology ,Hubble constant ,Astrophysics ,QB460-466 - Abstract
We present an analysis of Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project I and II and extend the Hubble diagram from optical to near-infrared wavelengths ( uBgVriYJH ). We calculate the Hubble constant, H _0 , using various distance calibrators: Cepheids, the tip of the red giant branch (TRGB), and surface brightness fluctuations (SBFs). Combining all methods of calibration, we derive H _0 = 71.76 ± 0.58 (stat) ± 1.19 (sys) km s ^−1 Mpc ^−1 from the B band and H _0 = 73.22 ± 0.68 (stat) ± 1.28 (sys) km s ^−1 Mpc ^−1 from the H band. By assigning equal weight to the Cepheid, TRGB, and SBF calibrators, we derive the systematic errors required for consistency in the first rung of the distance ladder, resulting in a systematic error of 1.2 ∼ 1.3 km s ^−1 Mpc ^−1 in H _0 . As a result, relative to the statistics-only uncertainty, the tension between the late-time H _0 we derive by combining the various distance calibrators and the early-time H _0 from the cosmic microwave background is reduced. The highest precision in SN Ia luminosity is found in the Y band (0.12 ± 0.01 mag), as defined by the intrinsic scatter ( σ _int ). We revisit SN Ia Hubble residual-host mass correlations and recover previous results that these correlations do not change significantly between the optical and near-infrared wavelengths. Finally, SNe Ia that explode beyond 10 kpc from their host centers exhibit smaller dispersion in their luminosity, confirming our earlier findings. A reduced effect of dust in the outskirts of hosts may be responsible for this effect.
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- 2024
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14. Circumstellar Interaction Signatures in the Low-luminosity Type II SN 2021gmj
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Nicolás Meza-Retamal, Yize Dong, K. Azalee Bostroem, Stefano Valenti, Lluís Galbany, Jeniveve Pearson, Griffin Hosseinzadeh, Jennifer E. Andrews, David J. Sand, Jacob E. Jencson, Daryl Janzen, Michael J. Lundquist, Emily T. Hoang, Samuel Wyatt, Peter J. Brown, D. Andrew Howell, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Vladimir Kouprianov, Daichi Hiramatsu, Saurabh W. Jha, Nathan Smith, Joshua Haislip, Daniel E. Reichart, Manisha Shrestha, F. Fabián Rosales-Ortega, Thomas G. Brink, Alexei V. Filippenko, WeiKang Zheng, and Yi Yang
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Core-collapse supernovae ,Type II supernovae ,Circumstellar matter ,Stellar mass loss ,Red supergiant stars ,Astrophysics ,QB460-466 - Abstract
We present comprehensive optical observations of SN 2021gmj, a Type II supernova (SN II) discovered within a day of explosion by the Distance Less Than 40 Mpc survey. Follow-up observations show that SN 2021gmj is a low-luminosity SN II (LL SN II), with a peak magnitude M _V = −15.45 and an Fe ii velocity of ∼1800 km s ^−1 at 50 days past explosion. Using the expanding photosphere method, we derive a distance of ${17.8}_{-0.4}^{+0.6}$ Mpc. From the tail of the light curve we obtain a radioactive nickel mass of ${M}_{{}^{56}\mathrm{Ni}}$ = 0.014 ± 0.001 M _⊙ . The presence of circumstellar material (CSM) is suggested by the early-time light curve, early spectra, and high-velocity H α in absorption. Analytical shock-cooling models of the light curve cannot reproduce the fast rise, supporting the idea that the early-time emission is partially powered by the interaction of the SN ejecta and CSM. The inferred low CSM mass of 0.025 M _⊙ in our hydrodynamic-modeling light-curve analysis is also consistent with our spectroscopy. We observe a broad feature near 4600 Å, which may be high-ionization lines of C, N, or/and He ii . This feature is reproduced by radiation-hydrodynamic simulations of red supergiants with extended atmospheres. Several LL SNe II show similar spectral features, implying that high-density material around the progenitor may be common among them.
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- 2024
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15. Shock Cooling and Possible Precursor Emission in the Early Light Curve of the Type II SN 2023ixf
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Griffin Hosseinzadeh, Joseph Farah, Manisha Shrestha, David J. Sand, Yize Dong, Peter J. Brown, K. Azalee Bostroem, Stefano Valenti, Saurabh W. Jha, Jennifer E. Andrews, Iair Arcavi, Joshua Haislip, Daichi Hiramatsu, Emily Hoang, D. Andrew Howell, Daryl Janzen, Jacob E. Jencson, Vladimir Kouprianov, Michael Lundquist, Curtis McCully, Nicolas E. Meza Retamal, Maryam Modjaz, Megan Newsome, Estefania Padilla Gonzalez, Jeniveve Pearson, Craig Pellegrino, Aravind P. Ravi, Daniel E. Reichart, Nathan Smith, Giacomo Terreran, and József Vinkó
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Circumstellar matter ,Core-collapse supernovae ,Red supergiant stars ,Stellar mass loss ,Supernovae ,Type II supernovae ,Astrophysics ,QB460-466 - Abstract
We present the densely sampled early light curve of the Type II supernova (SN) 2023ixf, first observed within hours of explosion in the nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc). Comparing these data to recently updated models of shock-cooling emission, we find that the progenitor likely had a radius of 410 ± 10 R _⊙ . Our estimate is model dependent but consistent with a red supergiant. These models provide a good fit to the data starting about 1 day after the explosion, despite the fact that the classification spectrum shows signatures of circumstellar material around SN 2023ixf during that time. Photometry during the first day after the explosion, provided almost entirely by amateur astronomers, does not agree with the shock-cooling models or a simple power-law rise fit to data after 1 day. We consider the possible causes of this discrepancy, including precursor activity from the progenitor star, circumstellar interaction, and emission from the shock before or after it breaks out of the stellar surface. The very low luminosity (−11 mag > M > −14 mag) and short duration of the initial excess lead us to prefer a scenario related to prolonged emission from the SN shock traveling through the progenitor system.
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- 2023
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16. Early-time Ultraviolet and Optical Hubble Space Telescope Spectroscopy of the Type II Supernova 2022wsp
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Sergiy S. Vasylyev, Christian Vogl, Yi Yang, Alexei V. Filippenko, Thomas G. Brink, Peter J. Brown, Thomas Matheson, Maryam Modjaz, Avishay Gal-Yam, Paolo A. Mazzali, Thomas de Jaeger, Kishore C. Patra, and Gabrielle E. Stewart
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Ultraviolet spectroscopy ,Spectroscopy ,Astrophysics ,QB460-466 - Abstract
We report early-time ultraviolet (UV) and optical spectroscopy of the young, nearby Type II supernova (SN) 2022wsp obtained by the Hubble Space Telescope (HST)/STIS at about 10 and 20 days after the explosion. The SN 2022wsp UV spectra are compared to those of other well-observed Type II/IIP SNe, including the recently studied Type IIP SN 2021yja. Both SNe exhibit rapid cooling and similar evolution during early phases, indicating a common behavior among SNe II. Radiative-transfer modeling of the spectra of SN 2022wsp with the TARDIS code indicates a steep radial density profile in the outer layer of the ejecta, a solar metallicity, and a relatively high total extinction of E ( B − V ) = 0.35 mag. The early-time evolution of the photospheric velocity and temperature derived from the modeling agree with the behavior observed from other previously studied cases. The strong suppression of hydrogen Balmer lines in the spectra suggests interaction with a preexisting circumstellar environment could be occurring at early times. In the SN 2022wsp spectra, the absorption component of the Mg ii P Cygni profile displays a double-trough feature on day +10 that disappears by day +20. The shape is well reproduced by the model without fine-tuning the parameters, suggesting that the secondary blueward dip is a metal transition that originates in the SN ejecta.
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- 2023
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17. A Swift Response to Newly Discovered, Nearby Transients
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Peter J. Brown, Macie Robertson, Yaswant Devarakonda, Emily Sarria, David Pooley, and Maximilian D. Stritzinger
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time domain astronomy (2109) ,transient sources (1851) ,supernovae (1668) ,ultraviolet astronomy(1736) ,ultraviolet Telescopes (1743) ,ultraviolet transient sources (1854) ,Elementary particle physics ,QC793-793.5 - Abstract
The Neil Gehrels Swift Observatory has proven to be an extraordinary supernova (SN) observatory. The clearest application of Swift’s unique strengths is obtaining very early UV and X-ray data of young SNe, which enables robust constraints on their progenitor systems. As part of a year-long Swift Guest Investigator Key Project, we initiated a follow-up program to rapidly observe all of the nearest (distance < 35 Mpc or roughly z < 0.008) extragalactic transients without waiting for them to be spectroscopically classified as supernovae. Among the possible results were to measure any UV-bright radiative cooling following the shock breakout from core-collapse SNe and shock emission from the interaction of thermonuclear Type Ia SNe with a non-degenerate companion. Just as importantly, uniformly following up and analyzing a significant sample can constrain the fraction of events for which the shock emission is not seen. Here we present the UV and X-ray measurements performed during our campaign. Our sample of 24 observed triggers included three SNe Ia, six SNe II, three stripped-envelope, core-collapse SNe, five galactic transients, three extragalactic SN imposters, and four unconfirmed transients. For our sample, the median delay time from the discovery image to the first Swift image was 1.45 days. We tabulate the X-ray upper limits and find they are sufficiently deep to have detected objects as X-ray luminous as GRB060218/SN2006aj. Other X-ray-detected SNe such as SNe 2006bp, 2008D, and 2011dh would have been detectable in some of the observations. We highlight the spectroscopically classified Type II SN 2018hna with UV-optical light curves indicating a luminosity and flux evolution very similar to SN 1987A.
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- 2023
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18. SN 2022acko: The First Early Far-ultraviolet Spectra of a Type IIP Supernova
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K. Azalee Bostroem, Luc Dessart, D. John Hillier, Michael Lundquist, Jennifer E. Andrews, David J. 一泽 Sand 董, Yize Dong, Stefano Valenti, Joshua Haislip, Emily T. Hoang, Griffin Hosseinzadeh, Daryl Janzen, Jacob E. Jencson, Saurabh W. Jha, Vladimir Kouprianov, Jeniveve Pearson, Nicolas E. Meza Retamal, Daniel E. Reichart, Manisha Shrestha, Christopher Ashall, E. Baron, Peter J. Brown, James M. DerKacy, Joseph Farah, Lluís Galbany, J. I. González Hernández, Elizabeth Green, Peter Hoeflich, D. Andrew Howell, Lindsey A. Kwok, Curtis McCully, Tomás E. Müller-Bravo, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Jeonghee Rho, Micalyn Rowe, Michaela Schwab, Melissa Shahbandeh, Nathan Smith, Jay Strader, Giacomo Terreran, Schuyler D. Van Dyk, and Samuel Wyatt
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- 2023
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19. A Framework for Quantum-Secure Device-Independent Randomness Expansion.
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Peter J. Brown, Sammy Ragy, and Roger Colbeck
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- 2020
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20. Discovery of a Potent and Selective Targeted NSD2 Degrader for the Reduction of H3K36me2
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Ronan P. Hanley, David Y. Nie, John R. Tabor, Fengling Li, Amin Sobh, Chenxi Xu, Natalie K. Barker, David Dilworth, Taraneh Hajian, Elisa Gibson, Magdalena M. Szewczyk, Peter J. Brown, Dalia Barsyte-Lovejoy, Laura E. Herring, Gang Greg Wang, Jonathan D. Licht, Masoud Vedadi, Cheryl H. Arrowsmith, and Lindsey I. James
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Colloid and Surface Chemistry ,General Chemistry ,Biochemistry ,Catalysis - Published
- 2023
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21. Discovery of Nanomolar DCAF1 Small Molecule Ligands
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Alice Shi Ming Li, Serah Kimani, Brian Wilson, Mahmoud Noureldin, Héctor González-Álvarez, Ahmed Mamai, Laurent Hoffer, John P. Guilinger, Ying Zhang, Moritz von Rechenberg, Jeremy S. Disch, Christopher J. Mulhern, Belinda L. Slakman, John W. Cuozzo, Aiping Dong, Gennady Poda, Mohammed Mohammed, Punit Saraon, Manish Mittal, Pratik Modh, Vaibhavi Rathod, Bhashant Patel, Suzanne Ackloo, Vijayaratnam Santhakumar, Magdalena M Szewczyk, Dalia Barsyte-Lovejoy, Cheryl H. Arrowsmith, Richard Marcellus, Marie-Aude Guié, Anthony D. Keefe, Peter J. Brown, Levon Halabelian, Rima Al-awar, and Masoud Vedadi
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Drug Discovery ,Molecular Medicine - Published
- 2023
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22. Discovery and Characterization of BAY-805, a Potent and Selective Inhibitor of Ubiquitin-Specific Protease USP21
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Fabian Göricke, Victoria Vu, Leanna Smith, Ulrike Scheib, Raphael Böhm, Namik Akkilic, Gerd Wohlfahrt, Jörg Weiske, Ulf Bömer, Krzysztof Brzezinka, Niels Lindner, Philip Lienau, Stefan Gradl, Hartmut Beck, Peter J. Brown, Vijayaratnam Santhakumar, Masoud Vedadi, Dalia Barsyte-Lovejoy, Cheryl H. Arrowsmith, Norbert Schmees, and Kirstin Petersen
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Drug Discovery ,Molecular Medicine - Published
- 2023
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23. Significant luminosity differences of two twin Type Ia supernovae
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Ryan J Foley, Samantha L Hoffmann, Lucas M Macri, Adam G Riess, Peter J Brown, Alexei V Filippenko, Melissa L Graham, and Peter A Milne
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- 2019
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24. Using 1991T/1999aa-like Type Ia Supernovae as Standardizable Candles
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Jiawen Yang, Lifan Wang, Nicholas Suntzeff, Lei Hu, Lauren Aldoroty, Peter J. Brown, Kevin Krisciunas, Iair Arcavi, Jamison Burke, Lluís Galbany, Daichi Hiramatsu, Griffin Hosseinzadeh, D. Andrew Howell, Curtis McCully, Craig Pellegrino, and Stefano Valenti
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- 2022
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25. Comparisons of Type Ia Supernova Light Curves in the UV and Optical with the Swift Ultra-violet/Optical Telescope
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Yaswant Devarakonda and Peter J. Brown
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- 2022
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26. Galaxian Contamination in Galactic Reddening Maps
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Peter J. Brown and Tate Walker
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- 2021
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27. Explicit asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation.
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Aurélie Denys, Peter J. Brown, and Anthony Leverrier
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- 2021
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28. Supplementary Dataset 2 from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
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List of N-Myc-binding gene promoters at which H3K4me3 was reduced by WDR5 siRNA.
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- 2023
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29. Supplementary Dataset 3 from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
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List of N-Myc non-binding gene promoters at which H3K4me3 was reduced by WDR5 siRNA.
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- 2023
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30. Supplementary Dataset 4 from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
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List of N-Myc-binding gene promoters at which H3K4me3 was not reduced by WDR5 siRNA.
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- 2023
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31. Supplementary Methods-Figures-Tables from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
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Supplementary Methods-Figures-Tables
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- 2023
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32. Supplementary Dataset 1 from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
- Abstract
Genes differentially down- or up-regulated by WDR5 siRNAs by more than 1.5 fold, as shown by Affymetrix microarray, in BE(2)-C neuroblastoma cells 40 hours after siRNA transfection.
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- 2023
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33. Supplementary Dataset 5 from WDR5 Supports an N-Myc Transcriptional Complex That Drives a Protumorigenic Gene Expression Signature in Neuroblastoma
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Tao Liu, Antony Braithwaite, Glenn M. Marshall, Giovanni Perini, Stefan Hüttelmaier, Karen L. MacKenzie, Masoud Vedadi, Cheryl H. Arrowsmith, Peter J. Brown, Johannes H. Schulte, Ygal Haupt, Jason M. Shohet, Quan Zhao, Toby Trahair, Matthew Wong, Bernard Atmadibrata, Bing Liu, Pei Y. Liu, Andrew E. Tee, Rima Al-Awar, Jason W.H. Wong, Giorgio Milazzo, Rebecca C. Poulos, Samuele Gherardi, Daniel Carter, Jessica L. Bell, and Yuting Sun
- Abstract
List of N-Myc non-binding gene promoters at which H3K4me3 was not reduced by WDR5 siRNA.
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- 2023
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34. Reference compounds for characterizing cellular injury in high-content cellular morphology assays
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Jayme L. Dahlin, Bruce K. Hua, Beth E. Zucconi, Shawn D. Nelson, Shantanu Singh, Anne E. Carpenter, Jonathan H. Shrimp, Evelyne Lima-Fernandes, Mathias J. Wawer, Lawrence P. W. Chung, Ayushi Agrawal, Mary O’Reilly, Dalia Barsyte-Lovejoy, Magdalena Szewczyk, Fengling Li, Parnian Lak, Matthew Cuellar, Philip A. Cole, Jordan L. Meier, Tim Thomas, Jonathan B. Baell, Peter J. Brown, Michael A. Walters, Paul A. Clemons, Stuart L. Schreiber, and Bridget K. Wagner
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Multidisciplinary ,General Physics and Astronomy ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology - Abstract
Robust, generalizable approaches to identify compounds efficiently with undesirable mechanisms of action in complex cellular assays remain elusive. Such a process would be useful for hit triage during high-throughput screening and, ultimately, predictive toxicology during drug development. We generated cell painting and cellular health profiles for 218 prototypical cytotoxic and nuisance compounds in U-2 OS cells in a concentration-response format. A diversity of compounds causing cellular damage produced bioactive cell painting morphologies, including cytoskeletal poisons, genotoxins, nonspecific electrophiles, and redox-active compounds. Further, we show that lower quality lysine acetyltransferase inhibitors and nonspecific electrophiles can be distinguished from more selective counterparts. We propose that the purposeful inclusion of cytotoxic and nuisance reference compounds such as those profiled in this Resource will help with assay optimization and compound prioritization in complex cellular assays like cell painting.
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- 2023
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35. Discovery and characterization of a chemical probe targeting the zinc-finger ubiquitin-binding domain of HDAC6
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Rachel J. Harding, Ivan Franzoni, Mandeep K. Mann, Magdalena M. Szewczyk, Bijan Mirabi, Dominic D.G Owens, Suzanne Ackloo, Alexej Scheremetjew, Kevin A. Juarez-Ornelas, Randy Sanichar, Rachel J. Baker, Christian Dank, Peter J. Brown, Dalia Barsyte-Lovejoy, Vijayaratnam Santhakumar, Matthieu Schapira, Mark Lautens, and Cheryl H. Arrowsmith
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open source ,ubiquitin binding domain ,chemical tool ,ubiquitin ,chemical probe ,UBD ,HDAC6 - Abstract
These data are the R scripts, environments, output used for analyzing chemoproteomics data. The volcano plot shown in the manuscript is based on the DEP R package. To validate the enrichment output from DEP, the proteomics data was also processed with the proDA package. Filename (7 files) Description combined_protein_Int.txt Output from database search hdac6_dep_submitted.R script used to process data (from DEP package) hdac6_dep_submitted.R.RData workspace environment from DEP package hdac6probecontrol_dep.csv exported list of p-value and fold-change from DEP hdac6probecontrol_proda.csv exported list of p-value and fold-change from proDA hdac6proda_submitted.R proDA script hdac6proda_submitted.RData proDA workspace environment, PXD039880 - the raw data is also uploaded to PRIDE.
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- 2023
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36. An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2021
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Toste Tanhua, Peter J. Brown, Claire Lo Monaco, Leticia Cotrim da Cunha, Fiz F. Pérez, Reiner Steinfeldt, Patrick Michaelis, Benjamin Pfeil, Susan Becker, Anton Velo, Mario Hoppema, Carsten Schirnick, Robert M. Key, Emil Jeansson, Bronte Tilbrook, Nico Lange, Rik Wanninkhof, Marta Álvarez, Are Olsen, Steve D Jones, Sara Jutterström, Alex Kozyr, Ryan J. Woosley, Henry C. Bittig, Akihiko Murata, Richard A. Feely, Maren K. Karlsen, Steven van Heuven, Masao Ishii, Toru Suzuki, Brendan R. Carter, Siv K. Lauvset, European Commission, Ministerio de Ciencia y Tecnología (España), Isotope Research, NORCE Norwegian Research Center, Helmholtz Centre for Ocean Research [Kiel] (GEOMAR), Cycles biogéochimiques marins : processus et perturbations (CYBIOM), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
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0106 biological sciences ,Biogeochemical cycle ,QE1-996.5 ,010504 meteorology & atmospheric sciences ,Group method of data handling ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,010604 marine biology & hydrobiology ,Alkalinity ,Context (language use) ,Geology ,[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] ,Atmospheric sciences ,01 natural sciences ,Environmental sciences ,Total inorganic carbon ,13. Climate action ,Dissolved organic carbon ,Global Ocean Data Analysis Project ,General Earth and Planetary Sciences ,Seawater ,GE1-350 ,14. Life underwater ,0105 earth and related environmental sciences - Abstract
25 pages, 10 figures, 7 tables.-- This work is distributed under the Creative Commons Attribution 4.0 License, The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables determined through chemical analysis of seawater samples. GLODAPv2.2021 is an update of the previous version, GLODAPv2.2020 (Olsen et al., 2020). The major changes are as follows: data from 43 new cruises were added, data coverage was extended until 2020, all data with missing temperatures were removed, and a digital object identifier (DOI) was included for each cruise in the product files. In addition, a number of minor corrections to GLODAPv2.2020 data were performed. GLODAPv2.2021 includes measurements from more than 1.3 million water samples from the global oceans collected on 989 cruises. The data for the 12 GLODAP core variables (salinity, oxygen, nitrate, silicate, phosphate, dissolved inorganic carbon, total alkalinity, pH, CFC-11, CFC-12, CFC-113, and CCl4) have undergone extensive quality control with a focus on systematic evaluation of bias. The data are available in two formats: (i) as submitted by the data originator but updated to World Ocean Circulation Experiment (WOCE) exchange format and (ii) as a merged data product with adjustments applied to minimize bias. For this annual update, adjustments for the 43 new cruises were derived by comparing those data with the data from the 946 quality controlled cruises in the GLODAPv2.2020 data product using crossover analysis. Comparisons to estimates of nutrients and ocean CO2 chemistry based on empirical algorithms provided additional context for adjustment decisions in this version. The adjustments are intended to remove potential biases from errors related to measurement, calibration, and data handling practices without removing known or likely time trends or variations in the variables evaluated. The compiled and adjusted data product is believed to be consistent with to better than 0.005 in salinity, 1% in oxygen, 2% in nitrate, 2% in silicate, 2% in phosphate, 4 μmolkg-1 in dissolved inorganic carbon, 4 μmolkg-1 in total alkalinity, 0.01–0.02 in pH (depending on region), and 5% in the halogenated transient tracers. The other variables included in the compilation, such as isotopic tracers and discrete CO2 fugacity (fCO2), were not subjected to bias comparison or adjustments., The original data, their documentation, and DOI codes are available at the Ocean Carbon Data System of NOAA NCEI (https://www.ncei.noaa.gov/access/ocean-carbon-data-system/oceans/GLODAPv2_2021/, last access: 7 July 2021). This site also provides access to the merged data product, which is provided as a single global file and as four regional ones – the Arctic, Atlantic, Indian, and Pacific oceans – under https://doi.org/10.25921/ttgq-n825 (Lauvset et al., 2021). These bias-adjusted product files also include significant ancillary and approximated data and can be accessed via https://www.glodap.info (last access: 29 June 2021). These were obtained by interpolation of, or calculation from, measured data. This living data update documents the GLODAPv2.2021 methods and provides a broad overview of the secondary quality control procedures and results, This research has been supported by EU Horizon 2020 through the EuroSea action (grant no. 862626), internal strategic funding from NORCE Climate, Prociencia/UERJ (grant 2019–2021), IEO RADIALES and RADPROF projects, the UK Climate Linked Atlantic Sector Science (CLASS) NERC National Capability Long-term Single Centre Science Programme(grant no. NE/R015953/1), the BOCATS2 (PID2019-104279GBC21) project funded by MCIN/AEI/10.13039/501100011033 and contributing toWATER:iOS CSIC PTI, the NOAA Global Observations and Monitoring Division (fund reference 100007298), the Office of Oceanic and Atmospheric Research of NOAA Global Observations and Monitoring Division (fund reference 100007298), the Office of Oceanic and Atmospheric Research of NOAA, the BONUS INTEGRAL project (grant no. 03F0773A), the Australian Antarctic Program Partnership and the Integrated Marine Observing System, EU Horizon 2020 action SO-CHIC (grant no. 821001), and the Initiative and Networking Fund of the Helmholtz Association through the project “Digital Earth” (grant no. ZT-0025)
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- 2021
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37. Target 2035 – an update on private sector contributions
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Suzanne Ackloo, Albert A. Antolin, Jose Manuel Bartolome, Hartmut Beck, Alex Bullock, Ulrich A. K. Betz, Jark Böttcher, Peter J. Brown, Menorca Chaturvedi, Alisa Crisp, Danette Daniels, Jan Dreher, Kristina Edfeldt, Aled M. Edwards, Ursula Egner, Jon Elkins, Christian Fischer, Tine Glendorf, Steven Goldberg, Ingo V. Hartung, Alexander Hillisch, Evert Homan, Stefan Knapp, Markus Köster, Oliver Krämer, Josep Llaveria, Uta Lessel, Sven Lindemann, Lars Linderoth, Hisanori Matsui, Maurice Michel, Florian Montel, Anke Mueller-Fahrnow, Susanne Müller, Dafydd R. Owen, Kumar Singh Saikatendu, Vijayaratnam Santhakumar, Wendy Sanderson, Cora Scholten, Matthieu Schapira, Sujata Sharma, Brock Shireman, Michael Sundström, Matthew H. Todd, Claudia Tredup, Jennifer Venable, Timothy M. Willson, and Cheryl H. Arrowsmith
- Subjects
Pharmacology ,Organic Chemistry ,Drug Discovery ,Pharmaceutical Science ,Molecular Medicine ,Biochemistry - Abstract
Target 2035, an international federation of biomedical scientists from the public and private sectors, is leveraging ‘open’ principles to develop a pharmacological tool for every human protein.
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- 2023
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38. Carnegie Supernova Project: Classification of Type Ia Supernovae
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Anthony Burrow, E. Baron, Chris Ashall, Christopher R. Burns, N. Morrell, Maximilian D. Stritzinger, Peter J. Brown, G. Folatelli, Wendy L. Freedman, Lluís Galbany, P. Hoeflich, Eric Y. Hsiao, Kevin Krisciunas, M. M. Phillips, Anthony L. Piro, Nicholas B. Suntzeff, and Syed Uddin
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- 2020
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39. Ultraviolet Line Identifications and Spectral Formation Near Max Light in Type Ia Supernova 2011fe
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James M. DerKacy, E. Baron, David Branch, Peter Hoeflich, Peter Hauschildt, Peter J. Brown, and Lifan Wang
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- 2020
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40. Supplementary material to 'GLODAPv2.2022: the latest version of the global interior ocean biogeochemical data product'
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Siv K. Lauvset, Nico Lange, Toste Tanhua, Henry C. Bittig, Are Olsen, Alex Kozyr, Simone R. Alin, Marta Álvarez, Kumiko Azetsu-Scott, Leticia Barbero, Susan Becker, Peter J. Brown, Brendan R. Carter, Leticia Cotrim da Cunha, Richard A. Feely, Mario Hoppema, Matthew P. Humphreys, Masao Ishii, Emil Jeansson, Li-Qing Jiang, Steve D. Jones, Claire Lo Monaco, Akihiko Murata, Jens Daniel Müller, Fiz F. Pérez, Benjamin Pfeil, Carsten Schirnick, Reiner Steinfeldt, Toru Suzuki, Bronte Tilbrook, Adam Ulfsbo, Anton Velo, Ryan J. Woosley, and Robert M. Key
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- 2022
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41. Circulation-driven variability of Atlantic anthropogenic carbon transports and uptake
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Andrew Yool, Molly O. Baringer, Elaine L. McDonagh, Marie-José Messias, Peter J. Brown, David A. Smeed, Andrew J. Watson, Rik Wanninkhof, Ute Schuster, Christopher S. Meinen, Richard Sanders, and Brian A. King
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Atmosphere ,chemistry.chemical_compound ,Oceanography ,Circulation (fluid dynamics) ,chemistry ,Carbon dioxide ,General Earth and Planetary Sciences ,Environmental science ,chemistry.chemical_element ,Hydrography ,Mooring ,Carbon - Abstract
The ocean absorbs approximately a quarter of the carbon dioxide currently released to the atmosphere by human activities (Canth). A disproportionately large fraction accumulates in the North Atlantic due to the combined effects of transport by the Atlantic Meridional Overturning Circulation (AMOC) and air–sea exchange. However, discrepancies exist between modelled and observed estimates of the air–sea exchange due to unresolved ocean transport variability. Here we quantify the strength and variability of Canth transports across 26.5° N in the North Atlantic between 2004 and 2012 using circulation measurements from the RAPID mooring array and hydrographic observations. Over this period, decreasing circulation strength tended to decrease northward Canth transport, while increasing Canth concentrations (preferentially in the upper limb of the overturning circulation) tended to increase northward Canth transport. These two processes compensated each other over the 8.5-year period. While ocean transport and air–sea Canth fluxes are approximately equal in magnitude, the increasing accumulation rate of Canth in the North Atlantic combined with a stable ocean transport supply means we infer a growing contribution from air–sea Canth fluxes over the period. North Atlantic Canth accumulation is thus sensitive to AMOC strength, but growing atmospheric Canth uptake continues to significantly impact Canth transports. Slowdown of the Atlantic Meridional Overturning Circulation from 2004 to 2012 led to a decrease in its relative contribution to North Atlantic carbon accumulation, while the supply from air–sea fluxes increased, according to an analysis of ocean mooring circulation observations.
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- 2021
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42. SN 2015bf: A fast declining type II supernova with flash-ionized signatures
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Xulin Zhao, Melissa L. Graham, H. Yuk, WeiKang Zheng, Weili Lin, F. Huang, Hanna Sai, Jun Mo, Alexei V. Filippenko, Peter J. Brown, Han Lin, T. G. Brink, Liming Rui, Jujia Zhang, Danfeng Xiang, Yongzhi Cai, Tianmeng Zhang, Xinghan Zhang, Goni Halevi, Xue Li, Xiaofeng Wang, and Isaac Shivvers
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Physics ,010308 nuclear & particles physics ,Astronomy and Astrophysics ,Astrophysics ,Type II supernova ,Light curve ,01 natural sciences ,Luminosity ,Photometry (optics) ,Supernova ,Apparent magnitude ,Space and Planetary Science ,0103 physical sciences ,H-alpha ,Emission spectrum ,010303 astronomy & astrophysics - Abstract
We present optical and ultraviolet photometry, as well as optical spectra, for the type II supernova (SN) 2015bf. Our observations cover the phases from ∼2 to ∼200 d after explosion. The first spectrum is characterized by a blue continuum with a blackbody temperature of ∼24 000 K and flash-ionized emission lines. After about 1 week, the spectra of SN 2015bf evolve like those of a regular SN II. From the luminosity of the narrow emission component of H α, we deduce that the mass-loss rate is larger than ${\sim}3.7\times 10^{-3}\, {\rm M_\odot \, yr^{-1}}$. The disappearance of the flash features in the first week after explosion indicates that the circumstellar material is confined within ∼6 × 1014 cm. Thus, we suggest that the progenitor of SN 2015bf experienced violent mass loss shortly before the supernova explosion. The multiband light curves show that SN 2015bf has a high peak luminosity with an absolute visual magnitude MV = −18.11 ± 0.08 mag and a fast post-peak decline with a V-band decay of 1.22 ± 0.09 mag within ∼50 d after maximum light. Moreover, the R-band tail luminosity of SN 2015bf is fainter than that of SNe II with similar peak by 1–2 mag, suggesting a small amount of 56Ni (${\sim}0.009\, {\rm M_\odot }$) synthesized during the explosion. Such a low nickel mass indicates that the progenitor of SN 2015bf could be a super-asymptotic-giant-branch star that collapsed owing to electron capture.
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- 2021
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43. SN 2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves
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Jiazheng Zhu, Ning Jiang, Subo Dong, Alexei V. Filippenko, Richard J. Rudy, A. Pastorello, Christopher Ashall, Subhash Bose, R. S. Post, D. Bersier, Stefano Benetti, Thomas G. Brink, Ping Chen, Liming Dou, N. Elias-Rosa, Peter Lundqvist, Seppo Mattila, Ray W. Russell, Michael L. Sitko, Auni Somero, M. D. Stritzinger, Tinggui Wang, Peter J. Brown, E. Cappellaro, Morgan Fraser, Erkki Kankare, S. Moran, Simon Prentice, Tapio Pursimo, T. M. Reynolds, and WeiKang Zheng
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High Energy Astrophysical Phenomena (astro-ph.HE) ,Space and Planetary Science ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
When discovered, SN~2017egm was the closest (redshift $z=0.03$) hydrogen-poor superluminous supernova (SLSN-I) and a rare case that exploded in a massive and metal-rich galaxy. Thus, it has since been extensively observed and studied. We report spectroscopic data showing strong emission at around He~I $\lambda$10,830 and four He~I absorption lines in the optical. Consequently, we classify SN~2017egm as a member of an emerging population of helium-rich SLSNe-I (i.e., SLSNe-Ib). We also present our late-time photometric observations. By combining them with archival data, we analyze high-cadence ultra-violet, optical, and near-infrared light curves spanning from early pre-peak ($\sim -20\,d$) to late phases ($\sim +300\,d$). We obtain its most complete bolometric light curve, in which multiple bumps are identified. None of the previously proposed models can satisfactorily explain all main light-curve features, while multiple interactions between the ejecta and circumstellar material (CSM) may explain the undulating features. The prominent infrared excess with a blackbody luminosity of $10^7$--$10^8\,L_{sun}$ detected in SN~2017egm could originate from the emission of either an echo of a pre-existing dust shell, or newly-formed dust, offering an additional piece of evidence supporting the ejecta-CSM interaction model. Moreover, our analysis of deep $Chandra$ observations yields the tightest-ever constraint on the X-ray emission of an SLSN-I, amounting to an X-ray-to-optical luminosity ratio $\lesssim 10^{-3}$ at late phases ($\sim100-200\,d$), which could help explore its close environment and central engine., Comment: 25 pages, 14 Figures, 4 Tables; accepted for publication in ApJ (Mar. 2023)
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- 2023
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44. Context-Aware Retrieval for Ubiquitous Computing Environments.
- Author
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Gareth J. F. Jones and Peter J. Brown
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- 2003
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45. Exploiting contextual change in context-aware retrieval.
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Peter J. Brown and Gareth J. F. Jones
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- 2002
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46. Microbial ecosystem responses to alkalinity enhancement in the North Atlantic Subtropical Gyre
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Adam V. Subhas, Lukas Marx, Sarah Reynolds, Anita Flohr, Edward W. Mawji, Peter J. Brown, and B. B. Cael
- Subjects
Atmospheric Science ,Global and Planetary Change ,Management, Monitoring, Policy and Law ,Environmental Science (miscellaneous) ,Pollution - Abstract
In addition to reducing carbon dioxide (CO2) emissions, actively removing CO2 from the atmosphere is widely considered necessary to keep global warming well below 2°C. Ocean Alkalinity Enhancement (OAE) describes a suite of such CO2 removal processes that all involve enhancing the buffering capacity of seawater. In theory, OAE both stores carbon and offsets ocean acidification. In practice, the response of the marine biogeochemical system to OAE must be demonstrably negligible, or at least manageable, before it can be deployed at scale. We tested the OAE response of two natural seawater mixed layer microbial communities in the North Atlantic Subtropical Gyre, one at the Western gyre boundary, and one in the middle of the gyre. We conducted 4-day microcosm incubation experiments at sea, spiked with three increasing amounts of alkaline sodium salts and a 13C-bicarbonate tracer at constant pCO2. We then measured a suite of dissolved and particulate parameters to constrain the chemical and biological response to these additions. Microbial communities demonstrated occasionally measurable, but mostly negligible, responses to alkalinity enhancement. Neither site showed a significant increase in biologically produced CaCO3, even at extreme alkalinity loadings of +2,000 μmol kg−1. At the gyre boundary, alkalinity enhancement did not significantly impact net primary production rates. In contrast, net primary production in the central gyre decreased by ~30% in response to alkalinity enhancement. The central gyre incubations demonstrated a shift toward smaller particle size classes, suggesting that OAE may impact community composition and/or aggregation/disaggregation processes. In terms of chemical effects, we identify equilibration of seawater pCO2, inorganic CaCO3 precipitation, and immediate effects during mixing of alkaline solutions with seawater, as important considerations for developing experimental OAE methodologies, and for practical OAE deployment. These initial results underscore the importance of performing more studies of OAE in diverse marine environments, and the need to investigate the coupling between OAE, inorganic processes, and microbial community composition.
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- 2022
- Full Text
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47. A small molecule antagonist of SMN disrupts the interaction between SMN and RNAP II
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Yanli Liu, Aman Iqbal, Weiguo Li, Zuyao Ni, Yalong Wang, Jurupula Ramprasad, Karan Joshua Abraham, Mengmeng Zhang, Dorothy Yanling Zhao, Su Qin, Peter Loppnau, Honglv Jiang, Xinghua Guo, Peter J. Brown, Xuechu Zhen, Guoqiang Xu, Karim Mekhail, Xingyue Ji, Mark T. Bedford, Jack F. Greenblatt, and Jinrong Min
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Motor Neurons ,Muscular Atrophy, Spinal ,Multidisciplinary ,General Physics and Astronomy ,Humans ,SMN Complex Proteins ,General Chemistry ,RNA Polymerase II ,General Biochemistry, Genetics and Molecular Biology - Abstract
Survival of motor neuron (SMN) functions in diverse biological pathways via recognition of symmetric dimethylarginine (Rme2s) on proteins by its Tudor domain, and deficiency of SMN leads to spinal muscular atrophy. Here we report a potent and selective antagonist with a 4-iminopyridine scaffold targeting the Tudor domain of SMN. Our structural and mutagenesis studies indicate that both the aromatic ring and imino groups of compound 1 contribute to its selective binding to SMN. Various on-target engagement assays support that compound 1 specifically recognizes SMN in a cellular context and prevents the interaction of SMN with the R1810me2s of RNA polymerase II subunit POLR2A, resulting in transcription termination and R-loop accumulation mimicking SMN depletion. Thus, in addition to the antisense, RNAi and CRISPR/Cas9 techniques, potent SMN antagonists could be used as an efficient tool to understand the biological functions of SMN.
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- 2022
48. Infant-phase reddening by surface Fe-peak elements in a normal type Ia supernova
- Author
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Yuan Qi Ni, Dae-Sik Moon, Maria R. Drout, Abigail Polin, David J. Sand, Santiago González-Gaitán, Sang Chul Kim, Youngdae Lee, Hong Soo Park, D. Andrew Howell, Peter E. Nugent, Anthony L. Piro, Peter J. Brown, Lluís Galbany, Jamison Burke, Daichi Hiramatsu, Griffin Hosseinzadeh, Stefano Valenti, Niloufar Afsariardchi, Jennifer E. Andrews, John Antoniadis, Iair Arcavi, Rachael L. Beaton, K. Azalee Bostroem, Raymond G. Carlberg, S. Bradley Cenko, Sang-Mok Cha, Yize Dong, Avishay Gal-Yam, Joshua Haislip, Thomas W.-S. Holoien, Sean D. Johnson, Vladimir Kouprianov, Yongseok Lee, Christopher D. Matzner, Nidia Morrell, Curtis McCully, Giuliano Pignata, Daniel E. Reichart, Jeffrey Rich, Stuart D. Ryder, Nathan Smith, Samuel Wyatt, Sheng Yang, National Research Council of Canada, University of Toronto, Heising Simons Foundation, National Research Foundation of Korea, National Science Foundation (US), Israel Science Foundation, European Commission, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Stavros Niarchos Foundation, and Hellenic Foundation for Research and Innovation
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Pediatric ,High Energy Astrophysical Phenomena (astro-ph.HE) ,High-energy astrophysics ,Transient astrophysical phenomena ,Astrophysics - Solar and Stellar Astrophysics ,FOS: Physical sciences ,Time-domain astronomy ,Astronomy and Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,Stars ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
Ni, Y. Q., et al., Type Ia supernovae are thermonuclear explosions of white dwarf stars. They play a central role in the chemical evolution of the Universe and are an important measure of cosmological distances. However, outstanding questions remain about their origins. Despite extensive efforts to obtain natal information from their earliest signals, observations have thus far failed to identify how the majority of them explode. Here, we present infant-phase detections of SN 2018aoz from a very low brightness of −10.5 AB absolute magnitude, revealing a hitherto unseen plateau in the B band that results in a rapid redward colour evolution between 1.0 and 12.4 hours after the estimated epoch of first light. The missing B-band flux is best explained by line-blanket absorption from Fe-peak elements in the outer 1% of the ejected mass. The observed B − V colour evolution of the supernova also matches the prediction from an over-density of Fe-peak elements in the same outer 1% of the ejected mass, whereas bluer colours are expected from a purely monotonic distribution of Fe-peak elements. The presence of excess nucleosynthetic material in the extreme outer layers of the ejecta points to enhanced surface nuclear burning or extended subsonic mixing processes in some normal type Ia SN explosions., D.-S.M., M.R.D. and C.D.M. are supported by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada. D.-S.M. was supported in part by a Leading Edge Fund from the Canadian Foundation for Innovation (project no. 30951). M.R.D. was supported in part by the Canada Research Chairs Program, the Canadian Institute for Advanced Research (CIFAR) and the Dunlap Institute at the University of Toronto. D.J.S. acknowledges support by NSF grant nos. AST-1821987, 1821967 and 1908972 and from the Heising–Simons Foundation under grant no. 2020-1864. S.G.-G. acknowledges support by FCT under project CRISP PTDC/FIS-AST-31546 and project UIDB/00099/2020. H.S.P. was supported in part by a National Research Foundation (NRF) of Korea grant funded by the Korean government (MSIT, Ministry of Science and ICT; no. NRF-2019R1F1A1058228). P.J.B. acknowledges support from the Swift GI program 80NSSC19K0316. S.V., Y.D. and K.A.B. acknowledge support by NSF grant nos. AST-1813176 and AST-2008108. C.M. acknowledges support by NSF grant AST-1313484. I.A. is a CIFAR Azrieli Global Scholar in the Gravity and the Extreme Universe Program and acknowledges support from that program, from the Israel Science Foundation (grant nos. 2108/18 and 2752/19), from the United States – Israel Binational Science Foundation (BSF) and from an Israeli Council for Higher Education Alon Fellowship. R.L.B. acknowledges support by NASA through Hubble Fellowship grant no. 51386.01 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under contract no. NAS 5-26555. A.G.-Y. acknowledges support from the European Union via ERC grant no. 725161, the ISF GW Excellence Center, an IMOS space infrastructure grant and BSF/Transformative and GIF grants, as well as from the Benoziyo Endowment Fund for the Advancement of Science, the Deloro Institute for Advanced Research in Space and Optics, the Veronika A. Rabl Physics Discretionary Fund, P. and T. Gardner, the Yeda-Sela Center for Basic Research and a WIS-CIT joint research grant. A.G.-Y. is the recipient of the Helen and Martin Kimmel Award for Innovative Investigation. L.G. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) 10.13039/501100011033, the European Social Fund (ESF) ‘Investing in your future’ under the 2019 Ramón y Cajal program RYC2019-027683-I and the PID2020-115253GA-I00 HOSTFLOWS project, as well as from the Centro Superior de Investigaciones Científicas (CSIC) under the PIE project 20215AT016. G.P. acknowledges support from the Millennium Science Initiative through grant no. IC120009. J.A. is supported by the Stavros Niarchos Foundation (SNF) and the Hellenic Foundation for Research and Innovation (HFRI) under the 2nd Call of ‘Science and Society’ Action ‘Always strive for excellence – Theodoros Papazoglou’ (project no. 01431).
- Published
- 2022
49. A Link-Oriented Comparison of Hyperdocuments and Programs.
- Author
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Heather Brown, Peter J. Brown, Les Carr, Wendy Hall 0001, Wendy Milne, and Luc Moreau 0001
- Published
- 2000
- Full Text
- View/download PDF
50. Towards a Better Understanding of Context and Context-Awareness.
- Author
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Gregory D. Abowd, Anind K. Dey, Peter J. Brown, Nigel Davies 0001, Mark Smith, and Pete Steggles
- Published
- 1999
- Full Text
- View/download PDF
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