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A bodipy based hydroxylamine sensor
Sedgwick, Adam C.,Chapman, Robert S. L.,Gardiner, Jordan E.,Peacock, Lucy R.,Kim, Gyoungmi,Yoon, Juyoung,Bull, Steven D.,James, Tony D. The Royal Society of Chemistry 2017 Chemical communications Vol.53 No.75
<P>With this research, we have developed a bodipy based system as the first “turn-on” fluorescence system for the detection hydroxylamine.</P>
Excited-state intramolecular proton-transfer (ESIPT) based fluorescence sensors and imaging agents
Sedgwick, Adam C.,Wu, Luling,Han, Hai-Hao,Bull, Steven D.,He, Xiao-Peng,James, Tony D.,Sessler, Jonathan L.,Tang, Ben Zhong,Tian, He,Yoon, Juyoung The Royal Society of Chemistry 2018 Chemical Society reviews Vol.47 No.23
<P>In this review we will explore recent advances in the design and application of excited-state intramolecular proton-transfer (ESIPT) based fluorescent probes. Fluorescence based sensors and imaging agents (probes) are important in biology, physiology, pharmacology, and environmental science for the selective detection of biologically and/or environmentally important species. The development of ESIPT-based fluorescence probes is particularly attractive due to their unique properties, which include a large Stokes shift, environmental sensitivity and potential for ratiometric sensing.</P>
DETECTION OF Hα EMISSION FROM z>3.5 GALAXIES WITH AKARI-FUHYU NIR SPECTROSCOPY
Sedgwick, Chris,Serjeant, Stephen,Pearson, Chris,Takagi, Toshinobu,Matsuhara, Hideo,Wada, Takehiko,Lee, Hyung Mok,Im, Myungshin,Jeong, Woong-Seob,Oyabu, Shinki,White, Glenn J. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
This paper presents $H{\alpha}$ emission line detections for four galaxies at z > 3.5 made with AKARI as part of the FUHYU mission program. These are the highest-redshift $H{\alpha}$ detections to date in star-forming galaxies. AKARI's unique near-infrared spectroscopic capability has made these detections possible. For two of these galaxies, this represents the first evidence of their redshifts and confirms their physical association with a companion radio galaxy. The star formation rates (SFRs) estimated from the $H{\alpha}$ lines under-predict the SFRs estimated from their far-infrared luminosities by a factor of ~ 2 - 3. We have also detected broad $H{\alpha}$ components in the two radio galaxies which indicate the presence of quasars.
Sedgwick, Adam C.,Gardiner, Jordan E.,Kim, Gyoungmi,Yevglevskis, Maksims,Lloyd, Matthew D.,Jenkins, A. Toby A.,Bull, Steven D.,Yoon, Juyoung,James, Tony D. Royal Society of Chemistry 2018 Chemical communications Vol.54 No.38
<▼1><P>Two ‘turn on’ TCF-based fluorescence probes were developed for the detection of biological thiols (<B>TCF-GSH</B> and <B>TCFCl-GSH</B>).</P></▼1><▼2><P>Two ‘turn on’ TCF-based fluorescence probes were developed for the detection of biological thiols (<B>TCF-GSH</B> and <B>TCFCl-GSH</B>). <B>TCF-GSH</B> was shown to have a high sensitivity towards glutathione (GSH) with a 0.28 μM limit of detection. Unfortunately, at higher GSH concentrations the fluorescence intensity of <B>TCF-GSH</B> decreased and toxicity was observed for <B>TCF-GSH</B> in live cells. However, <B>TCFCl-GSH</B> was shown to be able to detect GSH at biologically relevant concentrations with a 0.45 μM limit of detection. No toxicity was found for <B>TCFCl-GSH</B> and a clear ‘turn on’ with good photostability was observed for the exogenous addition of GSH, Cys and HCys. Furthermore, <B>TCFCl-GSH</B> was used to evaluate the effects of drug treatment on the levels of GSH in live cells.</P></▼2>
Chris Sedgwick,STEPHEN SERJEANT,CHRIS PEARSON,I. Yamamura,S. Makiuti,N. Ikeda,Y. Fukuda,S. Oyabu,T. Koga,S. Amber,Glenn J. White 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have identified 22 quasars in the AKARI far-infrared all-sky Bright Source Catalogue, using a matching radius of < 10 “, and excluding matches which are close to foreground extended sources or cirrus. We have confirmed a relation between quasar optical luminosity and far-infrared luminosity which was found in an earlier study. In addition, we have found that the 11 sources which are at redshift z > 1 are magnified with respect to the predicted far-infrared luminosity, and consider this may be due to gravitational lensing. If confirmed, this would provide a new way to identify lenses; if not, we may have identified an interesting new population of extreme starbursting quasars. %We are currently seeking spectroscopic confirmation of the redshifts and improved imaging for these sources.
AKARI DEEP FIELD SOUTH: SPECTROSCOPIC OBSERVATIONS OF INFRARED SOURCES
Chris Sedgwick,STEPHEN SERJEANT,CHRIS PEARSON,Shuji Matsuura,MAI SHIRAHATA,Hideo Matsuhara,Lucia Marchetti,Glenn J. White,Mattia Vaccari,Ivano Baronchelli,Giulia Rodighiero,Bunyo Hadsukade,David L. Cl 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present a summary of our spectroscopic redshift catalogue of 404 sources in the {\it AKARI} Deep Field South (ADF-S). We have used the AAOmega spectrograph to target mid-infrared and far-infrared sources selected primarily from {\it AKARI} observations in this field for which we were able to obtain optical counterparts. Our sources with identified redshifts include 316 with H$\alpha$ detections at z ≤ 0.345 and 15 sources at z > 1 with MgII or Lyα emission lines. About 13% of our z ≤0.345 sources are dominated by active galactic nuclei (AGN) emission, although many show emission from both star formation and AGNs. The median Balmer decrement is 5.9. Ultra-luminous infrared galaxies (ULIRGs) were found only in the higher-redshift sources. Optical and near infrared data will be available shortly, enabling calibration of the line luminosities and spectral energy distribution (SED) fitting for these sources.
THE SYNERGY OF LARGE AREA SURVEYS WITH AKARI AND HERSCHEL
Pearson, Chris,Serjeant, Stephen,Sedgwick, Chris,White, Glenn J.,Matsuhara, Hideo,Takagi, Toshinobu,Nagisa, Oi,Murata, Kazumi,Nakagawa, Takao,Yamamura, Issei The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
The Herschel Space Observatory is the European Space Agency's state of the art infrared space telescope launched into space on 14 May 2009, covering the wavelength range from 70-700 microns with 3 instruments SPIRE, PACS and HIFI. Large area surveys are being carried out by Herschel in the AKARI legacy fields at the North and South Ecliptic Poles and the AKARI All-Sky Survey provides additional synergy with the largest survey with Herschel, H-ATLAS, covering more than 500 square degrees. This paper reports on some of the early results of these synergies between Herschel and AKARI including the first comparison of the AKARI All-Sky Survey number counts with the deeper Herschel surveys.
Molecular logic gates: the past, present and future
Erbas-Cakmak, Sundus,Kolemen, Safacan,Sedgwick, Adam C.,Gunnlaugsson, Thorfinnur,James, Tony D.,Yoon, Juyoung,Akkaya, Engin U. Royal Society of Chemistry, etc 2018 Chemical Society reviews Vol.47 No.7
<P>The field of molecular logic gates originated 25 years ago, when A. P. de Silva published a seminal article in <I>Nature</I>. Stimulated by this ground breaking research, scientists were inspired to join the race to simulate the workings of the fundamental components of integrated circuits using molecules. The rules of this game of mimicry were flexible, and have evolved and morphed over the years. This tutorial review takes a look back on and provides an overview of the birth and growth of the field of molecular logics. Spinning-off from chemosensor research, molecular logic gates quickly proved themselves to be more than intellectual exercises and are now poised for many potential practical applications. The ultimate goal of this vein of research became clearer only recently - to “boldly go where no silicon-based logic gate has gone before” and seek out a new deeper understanding of life inside tissues and cells.</P>