http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Molecular link between auxin and ROS-mediated polar growth
Mangano, Silvina,Denita-Juarez, Silvina Paola,Choi, Hee-Seung,Marzol, Eliana,Hwang, Youra,Ranocha, Philippe,Velasquez, Silvia Melina,Borassi, Cecilia,Barberini, Marí,a Laura,Aptekmann, Ariel Ale National Academy of Sciences 2017 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.114 No.20
<P>Root hair polar growth is endogenously controlled by auxin and sustained by oscillating levels of reactive oxygen species (ROS). These cells extend several hundred-fold their original size toward signals important for plant survival. Although their final cell size is of fundamental importance, the molecular mechanisms that control it remain largely unknown. Here we show that ROS production is controlled by the transcription factor RSL4, which in turn is transcriptionally regulated by auxin through several auxin response factors (ARFs). In this manner, auxin controls ROS-mediated polar growth by activating RSL4, which then up-regulates the expression of genes encoding NADPH oxidases (also known as RESPIRATORY BURST OXIDASE HOMOLOG proteins) and class III peroxidases, which catalyze ROS production. Chemical or genetic interference with ROS balance or peroxidase activity affects root hair final cell size. Overall, our findings establish a molecular link between auxin and ROS-mediated polar root hair growth.</P>
Swift Observations of GRB 060614
Vanessa Mangano,Giancarlo Cusumano,Daniele Malesani,Guido Chincarini 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.5
GRB 060614 is a remarkable nearby gamma-ray burst (GRB; z = 0.125) observed by the Swift space based observatory, and it has puzzling properties that challenge current progenitor models;its lack of any bright supernova down to very strict limits and its vanishing spectral lags are typical of short GRBs, strikingly at odds with the long (102 s) duration of this event. However, the burst presents optical, UV, and X-ray afterglows in remarkable agreement with standard jetted fireball models. In particular, spectral analysis of the Burst Alert Telescope (BAT) and the X-ray Telescope (XRT) data during the overlap time interval and after shows that the peak energy of the burst decays and crosses the XRT energy band within 500 s from the trigger. The afterglow shows a clear case of jet break, which is simultaneously detected at optical, UV, and X-ray wavelengths,possibly the best among Swift GRBs. Moreover, the Ultraviolet and Optical Telecope (UVOT)light curves possibly show evidence of the passage of the injection frequency across the optical band between 10 and 30 ks from the trigger.
Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants: AMPGas
Gibson, J. A. Arran,Mangano, Enzo,Shiko, Elenica,Greenaway, Alex G.,Gromov, Andrei V.,Lozinska, Magdalena M.,Friedrich, Daniel,Campbell, Eleanor E. B.,Wright, Paul A.,Brandani, Stefano American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.13
<P>The key challenge in postcombustion capture from gas-fired power plants is related to the low CO2 concentration in the flue gas (4-8% by volume). This means that conventional amine processes will result in a relatively high energy penalty, whereas novel adsorbents and adsorption processes have the potential to improve the efficiency of separation. High-selectivity adsorbents are required to achieve relatively high CO2 uptake at low partial pressures, which means that the separation process should be based on either very strong physisorption or chemisorption with thermal regeneration. From the process point of view, the main challenge is to develop efficient separation processes with rapid thermal cycles. In this report we present a detailed overview of the methodology behind the development of novel materials and processes as part of the 'Adsorption Materials and Processes for Gas-fired power plants' (AMPGas) project. Examples from a wide variety of materials tested are presented, and the design of an innovative bench-scale 12-column rotary wheel adsorber system is discussed. The strategy to design, characterize, and test novel materials (zeolites, amine-containing MOFs, amine-based silicas, amine-based activated carbons, and carbon nanotubes), specifically designed for CO2 capture from dilute streams is presented.</P>
Relativistic jet activity from the tidal disruption of a star by a massive black hole
Burrows, D. N.,Kennea, J. A.,Ghisellini, G.,Mangano, V.,Zhang, B.,Page, K. L.,Eracleous, M.,Romano, P.,Sakamoto, T.,Falcone, A. D.,Osborne, J. P.,Campana, S.,Beardmore, A. P.,Breeveld, A. A.,Chester, Nature Publishing Group, a division of Macmillan P 2011 Nature Vol.476 No.7361
Supermassive black holes have powerful gravitational fields with strong gradients that can destroy stars that get too close, producing a bright flare in ultraviolet and X-ray spectral regions from stellar debris that forms an accretion disk around the black hole. The aftermath of this process may have been seen several times over the past two decades in the form of sparsely sampled, slowly fading emission from distant galaxies, but the onset of the stellar disruption event has not hitherto been observed. Here we report observations of a bright X-ray flare from the extragalactic transient Swift J164449.3+573451. This source increased in brightness in the X-ray band by a factor of at least 10,000 since 1990 and by a factor of at least 100 since early 2010. We conclude that we have captured the onset of relativistic jet activity from a supermassive black hole. A companion paper comes to similar conclusions on the basis of radio observations. This event is probably due to the tidal disruption of a star falling into a supermassive black hole, but the detailed behaviour differs from current theoretical models of such events.