检索结果-内蒙古大学图书馆

2017年中国肿瘤标志物学术大会暨第十一届肿瘤标志物青年科学家论坛

作者： Wang Y Yun Y Wu B Wen L Wen M Yang H Zhao L Liu W Huang S Wen N Li Y Department of Oncology State Key Discipline of Cell BiologyXijing HospitalThe Fourth Military Medical University Institute of Stomatology Chinese PLA General Hospital State Key Laboratory of Cancer Biology Cell Engineering Research Center & Department of Cell BiologyThe Fourth Military Medical University Department of Pharmacy Affiliated Hospital of Academy of Military Medical Sciences Department of Neurosurgery The University of Texas MD Anderson Cancer Center Program in Cancer Biology The University of Texas Graduate School of Biomedical Sciences at Houston

Cancer cells exhibit the reprogrammed metabolism mainly via aerobic glycolysis, a phenomenon known historically as the Warburg effect;however, the underlying mechanisms remain largely unknown. In this study, we characterized the critical role of transcription factor Forkhead box protein M1(FOXM1) in aerobic glycolysis of human epithelial ovarian cancer(EOC) and its molecular mechanisms. Our data showed that aberrant expression of FOXM1 significantly contributed to the reprogramming of glucose metabolism in EOC cells. Aerobic glycolysis and cell proliferation were down-regulated in EOC cells when FOXM1 gene expression was suppressed by RNA interference. Moreover, knockdown of FOXM1 in EOC cells significantly reduced glucose transporter 1(GLUT1) and hexokinase 2(HK2) expression. FOXM1 bound directly to the GLUT1 and HK2 promoter regions and regulated the promoter activities and the expression of the genes at the transcriptional level. This reveals a novel mechanism by which glucose metabolism is regulated by FOXM1. Importantly, we further demonstrated that the expression levels of FOXM1, GLUT1 and HK2 were significantly increased in human EOC tissues relative to normal ovarian tissues, and that FOXM1 expression was positively correlated with GLUT1 and HK2 expression. Taken together, our results show that FOXM1 promotes reprogramming of glucose metabolism in EOC cells via activation of GLUT1 and HK2 transcription, suggesting that FOXM1 may be an important target in aerobic glycolysis pathway for developing novel anticancer agents.

关键词： FOXM1 GLUT1 HK2 epithelial ovarian cancer glucose metabolism

来源：评论

学校读者我要写书评

暂无评论

Development of bionic invasion membrane for the study of multiple sclerosis

Development of bionic invasion membrane for the study of mul...

引用

IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Chia-Yi Lee Kin Fong Lei Cheng-Lung Ku Chia-Hao Huang Ph.D. Program in Biomedical Engineering Chang Gung University Taiwan Department of Mechanical Engineering Chang Gung University Taiwan Graduate Institute of Clinical Medical Science Chang Gung University Taiwan Graduate Institute of Medical Mechatronics Chang Gung University Taiwan

ISBN: (纸本)9781509019489

Multiple sclerosis (MS) is an autoimmune disease and leads to many inflammations. Cause of this disease is autoreactive T cells invade the blood-brain-barrier and attack the myelin sheath. Because MS infringes upon young human and has gradual loss of bodily functions, the disease has a burden on society and economy. Traditional treatment is to use immune-suppressant, but it has many side effects. Currently, the most effective treatment of MS is to use Natalizumab. Target molecule of this agent is α4-integrin of T cells. The mechanism is to prevent invasion of activated lymphocytes across the blood-brain-barrier. However, this agent affects the overall immune response and easily generates side effects of progressive multifocal leukoencephalopathy (PML). Transwall systems are often used to investigate cell invasion, but there is no specific protein immobilizing on the isolation membrane of these systems. In this work, we have successfully developed a bionic invasion membrane for the study of MS. Different chemokines were applied to the system for the demonstration of drug screening application. The bionic invasion membrane was a PP/PTEE membrane coated with VCAM-1 protein. Jurkat T cell was used to evaluate the feasibility of using the membrane for the study of MS. Results indicated that the invasion ability of T cells was reduced by VCAM-1 protein. The current work provides bionic invasion membrane for the study of MS in vitro.

关键词： Biomembranes Proteins Multiple sclerosis Immune system Microfluidics Color

来源：评论

学校读者我要写书评

暂无评论

Strategies to improve stimulation efficiency for retinal prostheses

Strategies to improve stimulation efficiency for retinal pro...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Navya S. Davuluri Kiran Nimmagadda Artin Petrossians Mark S. Humayun James D. Weiland Department of Biomedical Engineering University of Southern California Los Angeles CA USA Neuroscience Graduate Program and MD/PhD Program University of Southern California Los Angeles CA USA Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA USA Department of Ophthalmology and the Department of Biomedical Engineering University of Southern California LosAngeles USA

Retinitis Pigmentosa (RP) is a degenerative disease of the retina that leads to vision loss. Retinal prostheses are being developed in order to restore functional vision in patients suffering from RP. We conducted in-vivo experiments in order to identify strategies to efficiently stimulate the retina. We electrically stimulated the retina and measured electrically evoked potentials (EERs) from the superior colliculus of rats. We compared the strength of EERs when voltage-controlled and current-controlled pulses of varying pulse width and charge levels were applied to the retina. In addition to comparing EER strength, we evaluated improvement in power efficiency afforded by a high surface area platinum-iridium material. Voltage-controlled pulses were more efficient than current-controlled pulses when the pulses have a short duration (

关键词：

来源：评论

学校读者我要写书评

暂无评论

Characterization and Performance Estimation of a MEMS Spirometer

引用

Procedia engineering 2016年 168卷 1020-1023页

作者： Sahar Habibiabad Yeşim Serinağaoğlu Doğrusöz Mustafa İlker Beyaz Graduate School of Natural and Applied Sciences – Biomedical Engineering Program Middle East Technical University Ankara 06800 TURKEY Department of Electrical and Electronics Engineering Middle East Technical University Ankara 06800 TURKEY Department of Electrical and Electronics Engineering Antalya International University Antalya 07190 TURKEY

The electrical characteristics and performance estimation of a MEMS spirometer is reported. The device design incorporates a silicon turbine, integrated magnets, ball bearings, and stators having planar coils. Pneumatic actuation of the turbine with tangential gas flow induces voltages on the stators. Spirometer parameters including breathing flow rate and lung capacity can be determined from the induced voltage amplitude and frequency. Two 12-pole stators with 25- and 50-turns per pole were fabricated. The resistance and inductance values were measured to be 3.9 kΩ and 2.6 mH, and 15.8 kΩ and 10.3 mH, respectively. The expected sensitivity of the devices was calculated to be 0.1 V/lpm and 0.2 V/lpm for the 25- and 50-turns per pole stators, respectively. The integration of all device components will lead to a compact and low-cost spirometer for patient self-monitoring.

关键词： MEMS spirometer flow sensor stator

来源：评论

学校读者我要写书评

暂无评论

Gender and personality type influence in peer evaluation 122

Gender and personality type influence in peer evaluation

引用

2015 122nd ASEE Annual Conference and Exposition

作者： Ostafichuk, Peter M. Sibley, James D'Entremont, Agnes Germaine Shirzad, Navid Department of Mechanical Engienering University of British Columbia VancouverBC Canada Biomedical Engineering Graduate Program UBC Canada

The influence of gender and personality type on peer evaluation scores in a sophomore mechanical engineering design course were considered. Eight cohorts from 2006 to 2013 were considered using mixed-linear model statistical analysis. The results revealed a statistically significant effect of evaluatee's personality preference, as described by the Myers-Briggs Type Indicator in the Judging-Perceiving domain;students with a preference for Judging received peer evaluation scores 1.1% higher on average (p = 0.001). Gender was shown to have a significant influence on peer evaluation score received but only for females with a preference for Introversion (1.3% higher scores than males) and females with a preference for Sensing (1.4% higher scores than males). In comparing two peer evaluation instruments as part of a three-year crossover study, the behaviorally anchored rating scale (BARS) instrument had peer evaluation score differences based on gender and personality type that were larger (reaching 3.7%) and had greater significance compared to an allocation of points (single score) instrument. The observed influences are small but non-negligible;they were slightly smaller than those reported by others for communications, management, and marketing students in terms of gender and social style influence on peer evaluation. Overall, the results suggest there is potential for evaluator bias in peer evaluation - the effects are large enough that they might be of concern to students but not so large as to invalidate the tools. Steps should be considered to educate students about potential bias. © American Society for engineering Education, 2015.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Initial experiments of a 128-channel FPGA and PC-based ultrasound imaging system for teaching and research activities

Initial experiments of a 128-channel FPGA and PC-based ultra...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Amauri Amorin Assef Joaquim Miguel Maia Eduardo Tavares Costa Electrical Engineering Department and the Graduate Program in Energy Systems (DAELT/PPGSE) Federal University of Technology - Parana (UTFPR) Curitiba Brazil Electronic Engineering Department Federal University of Technology - Parana (UTFPR) Curitiba Brazil Biomedical Engineering Department State University of Campinas (UNICAMP) Campinas Brazil

Although widely employed in medical diagnostic applications, most of the available commercial ultrasound (US) scanners do not always fit the needs of research users. Access to raw US data, portability, flexibility and advanced user control are essential features to explore alternative biomedical signal and imaging processing algorithms. In this paper, we present the initial results of a reconfigurable, cost-effective and modular 128-channel FPGA and PC-based US system, specifically designed for teaching and medical imaging research. The proposed system exploits the advantages of the MD2131 (Microchip Technology Inc.) beamformer source driver to generate arbitrary waveforms and the analog front-end AFE5805 (Texas Instruments Inc.) to obtain the maximum flexibility and wide data access to the various US data streams. Two applications involving plane wave excitation and delay-and-sum (DAS) beamforming are discussed. The results show that the open platform can help biomedical students and researchers to develop and evaluate different imaging strategies for medical US imaging and nondestructive testing (NDT) techniques, among other applications.

关键词： Array signal processing Transducers Field programmable gate arrays Hardware biomedical imaging Ultrasonic imaging

来源：评论

学校读者我要写书评

暂无评论

The micro/nanohybrid structures enhancing B35 cell guidance on chitosan

引用

Journal of Nanotechnology in engineering and Medicine 2015年第3期6卷 031005页

作者： Lin, Ying-Ting Li, Ching-Wen Wang, Gou-Jen Graduate Institute of Biomedical Engineering National Chung-Hsing University 250 Kuo Kuang Road Taichung40227 Taiwan Ph.D. Program in Tissue Engineering and Regenerative Medicine National Chung-Hsing University 250 Kuo Kuang Road Taichung40227 Taiwan Department of Mechanical Engineering Graduate Institute of Biomedical Engineering National Chung-Hsing University 250 Kuo Kuang Road Taichung40227 Taiwan

A novel chitosan scaffold with micro- and nano-hybrid structures was proposed in this study. The hemispheric array of the barrier layer of an anodic aluminum oxide (AAO) film was used as the substrate. Microelectromechanical systems and nickel electroforming techniques were integrated for fabricating chitosan scaffolds with different micro/ nanohybrid structures. Nerve cells were then cultured on the conduits. It was demonstrated that the scaffold with pure microstructures can guide the nerve cells to grow along the ridges of the microstructure and some cells to grow across the groove in between two ridges of the microstructure. It was also shown that the scaffold with microscale ridges and nanopatterns on the groove between two ridges can more effectively guide the cells to grow along the ridges, thus enhancing the proliferation of nerve cells. © 2016 by ASME.

关键词： Chitosan

来源：评论

学校读者我要写书评

暂无评论

Dynamic contrast-enhanced magnetic resonance imaging for head and neck cancers (vol 5, 18008, 2018)

引用

SCIENTIFIC DATA 2018年第1期5卷 1-10页

作者： Elhalawani, Hesham Ger, Rachel B. Mohamed, Abdallah S. R. Awan, Musaddiq J. Ding, Yao Li, Kimberly Fave, Xenia J. Beers, Andrew L. Driscoll, Brandon Hormuth, David A., II van Houdt, Petra J. He, Renjie Zhou, Shouhao Mathieu, Kelsey B. Li, Heng Coolens, Catherine Chung, Caroline Bankson, James A. Huang, Wei Wang, Jihong Sandulache, Vlad C. Lai, Stephen Y. Howell, Rebecca M. Stafford, R. Jason Yankeelov, Thomas E. van der Heide, Uulke A. Frank, Steven J. Barboriak, Daniel P. Hazle, John D. Court, Laurence E. Kalpathy-Cramer, Jayashree Fuller, Clifton D. Department of Radiation Oncology The University of Texas MD Anderson Cancer Center Houston Texas 77030 USA Department of Clinical Oncology and Nuclear Medicine Faculty of Medicine University of Alexandria Alexandria Egypt 21526 Techna Institute University Health Network Toronto Ontario Canada M5G 1L5 The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences Houston Texas 77030 USA Department of Radiation Physics The University of Texas MD Anderson Cancer Center Houston Texas 77030 USA Department of Imaging Physics The University of Texas MD Anderson Cancer Center Houston Texas 77030 USA Case Western Reserve University Cleveland OH 44106 USA University Hospitals Cleveland OH 44106 USA Advanced Imaging Research Center Knight Cancer Institute Oregon Health & Science University Portland Oregon 97007 USA The International School of Beaverton Beaverton Oregon 97007 USA Massachusetts General Hospital/Division of Health Sciences & Technology Athinoula A. Martinos Center for Biomedical Imaging Massachusetts Institute of Technology Charlestown Massachusetts 02129 USA Radiation Medicine Program Princess Margaret Cancer Centre University Health Network Toronto Ontario Canada M5G 2M9 Department of Radiation Oncology University of Toronto Toronto Ontario Canada M5S 3E2 Departments of Biomedical Engineering and Internal Medicine Institute for Computational Engineering and Sciences Livestrong Cancer Institutes The University of Texas Austin Texas 78712 USA Department of Radiation Oncology The Netherlands Cancer Institute Amsterdam CX 1066 The Netherlands United Imaging Healthcare America Houston Texas 77054 USA Department of Biostatistics The University of Texas MD Anderson Cancer Center Houston Texas 77030 USA Department of Otolaryngology Head and Neck Surgery Baylor College of Medicine Houston Texas 77030 USA Department of Head and Neck Surgery The University of Texas MD Anderson Cancer Center Houston Texas 77030

Dynamic myraidpro contrast-enhanced magnetic resonance imaging (DCE-MRI) has been correlated with prognosis in head and neck squamous cell carcinoma as well as with changes in normal tissues. These studies implement different software, either commercial or in-house, and different scan protocols. Thus, the generalizability of the results is not confirmed. To assist in the standardization of quantitative metrics to confirm the generalizability of these previous studies, this data descriptor delineates in detail the DCE-MRI digital imaging and communications in medicine (DICOM) files with DICOM radiation therapy (RT) structure sets and digital reference objects (DROs), as well as, relevant clinical data that encompass a data set that can be used by all software for comparing quantitative metrics. Variable flip angle (VFA) with six flip angles and DCE-MRI scans with a temporal resolution of 5.5 s were acquired in the axial direction on a 3T MR scanner with a field of view of 25.6 cm, slice thickness of 4 mm, and 256×256 matrix size.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Early Release Science of the exoplanet WASP-39b with JWST NIRCam

arXiv

引用

arXiv 2022年

作者： Ahrer, Eva-Maria Stevenson, Kevin B. Mansfield, Megan Moran, Sarah E. Brande, Jonathan Morello, Giuseppe Murray, Catriona A. Nikolov, Nikolay K. Petit dit de la Roche, Dominique J.M. Schlawin, Everett Wheatley, Peter J. Zieba, Sebastian Batalha, Natasha E. Damiano, Mario Goyal, Jayesh M. Lendl, Monika Lothringer, Joshua D. Mukherjee, Sagnick Ohno, Kazumasa Batalha, Natalie M. Battley, Matthew P. Bean, Jacob L. Beatty, Thomas G. Benneke, Björn Berta-Thompson, Zachory K. Carter, Aarynn L. Cubillos, Patricio E. Daylan, Tansu Espinoza, Néstor Gao, Peter Gibson, Neale P. Gill, Samuel Harrington, Joseph Hu, Renyu Kreidberg, Laura Lewis, Nikole K. Line, Michael R. López-Morales, Mercedes Parmentier, Vivien Powell, Diana K. Sing, David K. Tsai, Shang-Min Wakeford, Hannah R. Welbanks, Luis Alam, Munazza K. Alderson, Lili Allen, Natalie H. Anderson, David R. Barstow, Joanna K. Bayliss, Daniel Bell, Taylor J. Blecic, Jasmina Bryant, Edward M. Burleigh, Matthew R. Carone, Ludmila Casewell, S.L. Changeat, Quentin Chubb, Katy L. Crossfield, Ian J.M. Crouzet, Nicolas Decin, Leen Désert, Jean-Michel Feinstein, Adina D. Flagg, Laura Fortney, Jonathan J. Gizis, John E. Heng, Kevin Iro, Nicolas Kempton, Eliza M.-R. Kendrew, Sarah Kirk, James Knutson, Heather A. Komacek, Thaddeus D. Lagage, Pierre-Olivier Leconte, Jérémy Lustig-Yaeger, Jacob MacDonald, Ryan J. Mancini, Luigi May, E.M. Mayne, N.J. Miguel, Yamila Mikal-Evans, Thomas Molaverdikhani, Karan Palle, Enric Piaulet, Caroline Rackham, Benjamin V. Redfield, Seth Rogers, Laura K. Roy, Pierre-Alexis Rustamkulov, Zafar Shkolnik, Evgenya L. Sotzen, Kristin S. Taylor, Jake Tremblin, P. Tucker, Gregory S. Turner, Jake D. de Val-Borro, Miguel Venot, Olivia Zhang, Xi Centre for Exoplanets and Habitability University of Warwick Coventry United Kingdom Department of Physics University of Warwick Coventry United Kingdom Johns Hopkins APL LaurelMD United States Steward Observatory University of Arizona TucsonAZ United States NHFP Sagan Fellow United States Lunar and Planetary Laboratory University of Arizona TucsonAZ United States Department of Physics & Astronomy University of Kansas LawrenceKS United States Tenerife Spain Tenerife Spain INAF- Palermo Astronomical Observatory Piazza del Parlamento Palermo Italy Department of Astrophysical and Planetary Sciences University of Colorado BoulderCO United States Space Telescope Science Institute BaltimoreMD United States Département d'Astronomie Université de Genève Sauverny Switzerland Max Planck Institute for Astronomy Heidelberg Germany Leiden Observatory University of Leiden Leiden Netherlands NASA Ames Research Center Moffett Field CA United States Jet Propulsion Laboratory PasadenaCA United States HBNI Odisha India Department of Physics Utah Valley University OremUT United States Department of Astronomy & Astrophysics University of California Santa Cruz Santa CruzCA United States Astrobiology Program UC Santa Cruz Santa CruzCA United States Department of Astronomy & Astrophysics University of Chicago ChicagoIL United States Department of Astronomy University of Wisconsin-Madison MadisonWI United States Department of Physics Institute for Research on Exoplanets Université de Montréal MontrealQC Canada Space Research Institute Austrian Academy of Sciences Graz Austria INAF Osservatorio Astrofisico di Torino Pino Torinese Italy Department of Astrophysical Sciences Princeton University PrincetonNJ United States LSSTC Catalyst Fellow Department of Physics & Astronomy Johns Hopkins University BaltimoreMD United States Earth and Planets Laboratory Carnegie Institution for Science WashingtonDC United States School of Physics Trinity Col

Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in equilibrium, revealing planet formation histories. Transmission spectroscopye.g., 1,2 provides the necessary means by constraining the abundances of oxygen- and carbon-bearing species;however, this requires broad wavelength coverage, moderate spectral resolution, and high precision that, together, are not achievable with previous observatories. Now that JWST has commenced science operations, we are able to observe exoplanets at previously uncharted wavelengths and spectral resolutions. Here we report time-series observations of the transiting exoplanet WASP-39b using JWST’s Near InfraRed Camera (NIRCam). The long-wavelength spectroscopic and short-wavelength photometric light curves span 2.0 – 4.0 µm, exhibit minimal systematics, and reveal well-defined molecular absorption features in the planet’s spectrum. Specifically, we detect gaseous H2O in the atmosphere and place an upper limit on the abundance of CH4. The otherwise prominent CO2 feature at 2.8 µm is largely masked by H2O. The best-fit chemical equilibrium models favour an atmospheric metallicity of 1–100× solar (i.e., an enrichment of elements heavier than helium relative to the Sun) and a sub-stellar carbon-to-oxygen (C/O) ratio. The inferred high metallicity and low C/O ratio may indicate significant accretion of solid materials during planet formatione.g., 3,4 or disequilibrium processes in the upper atmospheree.g., 5,6 © 2022, CC BY.

关键词： Spectral resolution

来源：评论

学校读者我要写书评

暂无评论

Early Release Science of the exoplanet WASP-39b with JWST NIRISS

arXiv

引用

arXiv 2022年

作者： Feinstein, Adina D. Radica, Michael Welbanks, Luis Murray, Catriona Anne Ohno, Kazumasa Coulombe, Louis-Philippe Espinoza, Néstor Bean, Jacob L. Teske, Johanna K. Benneke, Björn Line, Michael R. Rustamkulov, Zafar Saba, Arianna Tsiaras, Angelos Barstow, Joanna K. Fortney, Jonathan J. Gao, Peter Knutson, Heather A. MacDonald, Ryan J. Mikal-Evans, Thomas Rackham, Benjamin V. Taylor, Jake Parmentier, Vivien Batalha, Natalie M. Berta-Thompson, Zachory K. Carter, Aarynn L. Changeat, Quentin Dos Santos, Leonardo A. Gibson, Neale P. Goyal, Jayesh M. Kreidberg, Laura López-Morales, Mercedes Lothringer, Joshua D. Miguel, Yamila Molaverdikhani, Karan Moran, Sarah E. Morello, Giuseppe Mukherjee, Sagnick Sing, David K. Stevenson, Kevin B. Wakeford, Hannah R. Ahrer, Eva-Maria Alam, Munazza K. Alderson, Lili Allen, Natalie H. Batalha, Natasha E. Bell, Taylor J. Blecic, Jasmina Brande, Jonathan Caceres, Claudio Casewell, S.L. Chubb, Katy L. Crossfield, Ian J.M. Crouzet, Nicolas Cubillos, Patricio E. Decin, Leen Désert, Jean-Michel Harrington, Joseph Heng, Kevin Henning, Thomas Iro, Nicolas Kempton, Eliza M.-R. Kendrew, Sarah Kirk, James Krick, Jessica Lagage, Pierre-Olivier Lendl, Monika Mancini, Luigi Mansfield, Megan May, E.M. Mayne, N.J. Nikolov, Nikolay K. Palle, Enric Petit dit de la Roche, Dominique J.M. Piaulet, Caroline Powell, Diana Redfield, Seth Rogers, Laura K. Roman, Michael T. Roy, Pierre-Alexis Nixon, Matthew C. Schlawin, Everett Tan, Xianyu Tremblin, P. Turner, Jake D. Venot, Olivia Waalkes, William C. Wheatley, Peter J. Zhang, Xi Department of Astronomy & Astrophysics University of Chicago ChicagoIL United States NSF Graduate Research Fellow Department of Physics Institute for Research on Exoplanets Université de Montréal MontrealQC Canada School of Earth and Space Exploration Arizona State University TempeAZ United States NHFP Sagan Fellow Department of Astrophysical and Planetary Sciences University of Colorado BoulderCO United States Department of Astronomy & Astrophysics University of California Santa Cruz Santa CruzCA United States Space Telescope Science Institute BaltimoreMD United States Department of Physics & Astronomy Johns Hopkins University BaltimoreMD United States Earth and Planets Laboratory Carnegie Institution for Science WashingtonDC United States Department of Earth and Planetary Sciences Johns Hopkins University BaltimoreMD United States Department of Physics and Astronomy University College London United Kingdom INAF - Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 Firenze Italy School of Physical Sciences The Open University Milton Keynes United Kingdom Division of Geological and Planetary Sciences California Institute of Technology PasadenaCA United States Department of Astronomy University of Michigan Ann ArborMI United States Department of Astronomy Carl Sagan Institute Cornell University IthacaNY United States Max Planck Institute for Astronomy Heidelberg Germany Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology CambridgeMA United States Kavli Institute for Astrophysics and Space Research Massachusetts Institute of Technology CambridgeMA United States 51 Pegasi b Fellow Atmospheric Oceanic and Planetary Physics Department of Physics University of Oxford Oxford United Kingdom Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Laboratoire Lagrange France Astrobiology Program UC Santa Cruz Santa CruzCA United States European Space Agency Space Telescope Science Institute Balti

Transmission spectroscopy provides insight into the atmospheric properties and consequently the formation history, physics, and chemistry of transiting exoplanets1. However, obtaining precise inferences of atmospheric properties from transmission spectra requires simultaneously measuring the strength and shape of multiple spectral absorption features from a wide range of chemical species2–4. This has been challenging given the precision and wavelength coverage of previous observatories5. Here, we present the transmission spectrum of the Saturn-mass exoplanet WASP-39 b obtained using the SOSS mode of the NIRISS instrument on the JWST. This spectrum spans 0.6–2.8 µm in wavelength and reveals multiple water absorption bands, the potassium resonance doublet, as well as signatures of clouds. The precision and broad wavelength coverage of NIRISS-SOSS allows us to break model degeneracies between cloud properties and the atmospheric composition of WASP-39 b, favouring a heavy element enhancement ("metallicity") of ~10 – 30× the solar value, a sub-solar carbon-to-oxygen (C/O) ratio, and a solar-to-super-solar potassium-to-oxygen (K/O) ratio. The observations are also best explained by wavelength-dependent, non-gray clouds with inhomogeneous coverage of the planet’s terminator. © 2022, CC BY.

关键词： Water absorption

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：