TY  - JOUR
A1  - Martinez Gonzalez, M. J.
A1  - Pastor Yabar, A.
A1  - Lagg, A.
A1  - Asensio Ramos, A.
A1  - Collados Vera, M.
A1  - Solanki, S. K.
A1  - Balthasar, H.
A1  - Berkefeld, T.
A1  - Denker, Carsten
A1  - Doerr, H. P.
A1  - Feller, A.
A1  - Franz, M.
A1  - González Manrique, Sergio Javier
A1  - Hofmann, A.
A1  - Kneer, F.
A1  - Kuckein, Christoph
A1  - Louis, R.
A1  - von der Lühe, O.
A1  - Nicklas, H.
A1  - Orozco, D.
A1  - Rezaei, R.
A1  - Schlichenmaier, R.
A1  - Schmidt, D.
A1  - Schmidt, W.
A1  - Sigwarth, M.
A1  - Sobotka, M.
A1  - Soltau, D.
A1  - Staude, J.
A1  - Strassmeier, Klaus G.
A1  - Verma, Meetu
A1  - Waldman, T.
A1  - Volkmer, R.
T1  - Inference of magnetic fields in the very quiet Sun
JF  - Journal of geophysical research : Earth surface
N2  - Context. Over the past 20 yr, the quietest areas of the solar surface have revealed a weak but extremely dynamic magnetism occurring at small scales (<500 km), which may provide an important contribution to the dynamics and energetics of the outer layers of the atmosphere. Understanding this magnetism requires the inference of physical quantities from high-sensitivity spectro-polarimetric data with high spatio-temporal resolution. Aims. We present high-precision spectro-polarimetric data with high spatial resolution (0.4") of the very quiet Sun at 1.56 mu m obtained with the GREGOR telescope to shed some light on this complex magnetism. Methods. We used inversion techniques in two main approaches. First, we assumed that the observed profiles can be reproduced with a constant magnetic field atmosphere embedded in a field-free medium. Second, we assumed that the resolution element has a substructure with either two constant magnetic atmospheres or a single magnetic atmosphere with gradients of the physical quantities along the optical depth, both coexisting with a global stray-light component. Results. Half of our observed quiet-Sun region is better explained by magnetic substructure within the resolution element. However, we cannot distinguish whether this substructure comes from gradients of the physical parameters along the line of sight or from horizontal gradients (across the surface). In these pixels, a model with two magnetic components is preferred, and we find two distinct magnetic field populations. The population with the larger filling factor has very weak (similar to 150 G) horizontal fields similar to those obtained in previous works. We demonstrate that the field vector of this population is not constrained by the observations, given the spatial resolution and polarimetric accuracy of our data. The topology of the other component with the smaller filling factor is constrained by the observations for field strengths above 250 G: we infer hG fields with inclinations and azimuth values compatible with an isotropic distribution. The filling factors are typically below 30%. We also find that the flux of the two polarities is not balanced. From the other half of the observed quiet-Sun area similar to 50% are two-lobed Stokes V profiles, meaning that 23% of the field of view can be adequately explained with a single constant magnetic field embedded in a non-magnetic atmosphere. The magnetic field vector and filling factor are reliable inferred in only 50% based on the regular profiles. Therefore, 12% of the field of view harbour hG fields with filling factors typically below 30%. At our present spatial resolution, 70% of the pixels apparently are non-magnetised.
KW  - Sun: atmosphere
KW  - Sun: magnetic fields
KW  - techniques: polarimetric
KW  - methods: observational
Y1  - 2016
U6  - https://doi.org/10.1051/0004-6361/201628449
SN  - 1432-0746
VL  - 596
PB  - EDP Sciences
CY  - Les Ulis
ER  - 
TY  - JOUR
A1  - Wolf, Thomas J. A.
A1  - Sanchez, David M.
A1  - Yang, J.
A1  - Parrish, R. M.
A1  - Nunes, J. P. F.
A1  - Centurion, M.
A1  - Coffee, R.
A1  - Cryan, J. P.
A1  - Gühr, Markus
A1  - Hegazy, Kareem
A1  - Kirrander, Adam
A1  - Li, R. K.
A1  - Ruddock, J.
A1  - Shen, Xiaozhe
A1  - Vecchione, T.
A1  - Weathersby, S. P.
A1  - Weber, Peter M.
A1  - Wilkin, K.
A1  - Yong, Haiwang
A1  - Zheng, Q.
A1  - Wang, X. J.
A1  - Minitti, Michael P.
A1  - Martinez, Todd J.
T1  - The photochemical ring-opening of 1,3-cyclohexadiene imaged by ultrafast electron diffraction
JF  - Nature chemistry
N2  - The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis. Although the relaxation from the photoexcited electronic state during the ring-opening has been investigated in numerous studies, the accompanying changes in atomic distance have not been resolved. Here we present a direct and unambiguous observation of the ring-opening reaction path on the femtosecond timescale and subangstrom length scale using megaelectronvolt ultrafast electron diffraction. We followed the carbon-carbon bond dissociation and the structural opening of the 1,3-cyclohexadiene ring by the direct measurement of time-dependent changes in the distribution of interatomic distances. We observed a substantial acceleration of the ring-opening motion after internal conversion to the ground state due to a steepening of the electronic potential gradient towards the product minima. The ring-opening motion transforms into rotation of the terminal ethylene groups in the photoproduct 1,3,5-hexatriene on the subpicosecond timescale.
KW  - Organic chemistry
KW  - Photochemistry
KW  - Physical chemistry
KW  - Theoretical chemistry
Y1  - 2019
U6  - https://doi.org/10.1038/s41557-019-0252-7
SN  - 1755-4330
SN  - 1755-4349
VL  - 11
IS  - 6
SP  - 504
EP  - 509
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Sadovnichii, V. A.
A1  - Panasyuk, M. I.
A1  - Amelyushkin, A. M.
A1  - Bogomolov, V. V.
A1  - Benghin, V. V.
A1  - Garipov, G. K.
A1  - Kalegaev, V. V.
A1  - Klimov, P. A.
A1  - Khrenov, B. A.
A1  - Petrov, V. L.
A1  - Sharakin, S. A.
A1  - Shirokov, A. V.
A1  - Svertilov, S. I.
A1  - Zotov, M. Y.
A1  - Yashin, I. V.
A1  - Gorbovskoy, E. S.
A1  - Lipunov, V. M.
A1  - Park, I. H.
A1  - Lee, J.
A1  - Jeong, S.
A1  - Kim, M. B.
A1  - Jeong, H. M.
A1  - Shprits, Yuri
A1  - Angelopoulos, V.
A1  - Russell, C. T.
A1  - Runov, A.
A1  - Turner, D.
A1  - Strangeway, R. J.
A1  - Caron, R.
A1  - Biktemerova, S.
A1  - Grinyuk, A.
A1  - Lavrova, M.
A1  - Tkachev, L.
A1  - Tkachenko, A.
A1  - Martinez, O.
A1  - Salazar, H.
A1  - Ponce, E.
T1  - "Lomonosov" Satellite-Space Observatory to Study Extreme Phenomena in Space
JF  - Space science reviews
N2  - The "Lomonosov" space project is lead by Lomonosov Moscow State University in collaboration with the following key partners: Joint Institute for Nuclear Research, Russia, University of California, Los Angeles (USA), University of Pueblo (Mexico), Sungkyunkwan University (Republic of Korea) and with Russian space industry organi-zations to study some of extreme phenomena in space related to astrophysics, astroparticle physics, space physics, and space biology. The primary goals of this experiment are to study: -Ultra-high energy cosmic rays (UHECR) in the energy range of the Greizen-ZatsepinKuzmin (GZK) cutoff; -Ultraviolet (UV) transient luminous events in the upper atmosphere; -Multi-wavelength study of gamma-ray bursts in visible, UV, gamma, and X-rays; -Energetic trapped and precipitated radiation (electrons and protons) at low-Earth orbit (LEO) in connection with global geomagnetic disturbances; -Multicomponent radiation doses along the orbit of spacecraft under different geomagnetic conditions and testing of space segments of optical observations of space-debris and other space objects; -Instrumental vestibular-sensor conflict of zero-gravity phenomena during space flight. This paper is directed towards the general description of both scientific goals of the project and scientific equipment on board the satellite. The following papers of this issue are devoted to detailed descriptions of scientific instruments.
KW  - Gamma-ray bursts
KW  - Ultra-high energy cosmic rays
KW  - Radiation belts
KW  - Space mission
Y1  - 2017
U6  - https://doi.org/10.1007/s11214-017-0425-x
SN  - 0038-6308
SN  - 1572-9672
VL  - 212
SP  - 1705
EP  - 1738
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - GEN
A1  - Sadovnichii, V. A.
A1  - Panasyuk, M. I.
A1  - Amelyushkin, A. M.
A1  - Benghin, V. V.
A1  - Garipov, G. K.
A1  - Kalegaev, V. V.
A1  - Klimov, P. A.
A1  - Khrenov, B. A.
A1  - Petrov, V. L.
A1  - Sharakin, S. A.
A1  - Shirokov, A. V.
A1  - Svertilov, S. I.
A1  - Zotov, M. Y.
A1  - Yashin, I. V.
A1  - Gorbovskoy, E. S.
A1  - Lipunov, V. M.
A1  - Park, I. H.
A1  - Lee, J.
A1  - Jeong, S.
A1  - Kim, M. B.
A1  - Jeong, H. M.
A1  - Shprits, Yuri
A1  - Angelopoulos, V.
A1  - Russell, C. T.
A1  - Runov, A.
A1  - Turner, D.
A1  - Strangeway, R. J.
A1  - Caron, R.
A1  - Biktemerova, S.
A1  - Grinyuk, A.
A1  - Lavrova, M.
A1  - Tkachev, L.
A1  - Tkachenko, A.
A1  - Martinez, O.
A1  - Salazar, H.
A1  - Ponce, E.
T1  - "Lomonosov" satellite-space observatory to study extreme phenomena in space
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The "Lomonosov" space project is lead by Lomonosov Moscow State University in collaboration with the following key partners: Joint Institute for Nuclear Research, Russia, University of California, Los Angeles (USA), University of Pueblo (Mexico), Sungkyunkwan University (Republic of Korea) and with Russian space industry organi-zations to study some of extreme phenomena in space related to astrophysics, astroparticle physics, space physics, and space biology. The primary goals of this experiment are to study:

-Ultra-high energy cosmic rays (UHECR) in the energy range of the Greizen-ZatsepinKuzmin (GZK) cutoff;

-Ultraviolet (UV) transient luminous events in the upper atmosphere;

-Multi-wavelength study of gamma-ray bursts in visible, UV, gamma, and X-rays;

-Energetic trapped and precipitated radiation (electrons and protons) at low-Earth orbit (LEO) in connection with global geomagnetic disturbances;

-Multicomponent radiation doses along the orbit of spacecraft under different geomagnetic conditions and testing of space segments of optical observations of space-debris and other space objects;

-Instrumental vestibular-sensor conflict of zero-gravity phenomena during space flight.

This paper is directed towards the general description of both scientific goals of the project and scientific equipment on board the satellite. The following papers of this issue are devoted to detailed descriptions of scientific instruments.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 959 
KW  - gamma-ray bursts
KW  - ultra-high energy cosmic rays
KW  - radiation belts
KW  - space mission
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-428185
SN  - 1866-8372
IS  - 959
SP  - 1705
EP  - 1738
ER  - 
TY  - GEN
A1  - Zór, K.
A1  - Heiskanen, A.
A1  - Caviglia, Claudia
A1  - Vergani, M.
A1  - Landini, E.
A1  - Shah, F.
A1  - Carminati, Marco
A1  - Martínez-Serrano, A.
A1  - Ramos Moreno, T.
A1  - Kokaia, M.
A1  - Benayahu, Dafna
A1  - Keresztes, Zs.
A1  - Papkovsky, D.
A1  - Wollenberger, Ursula
A1  - Svendsen, W. E.
A1  - Dimaki, M.
A1  - Ferrari, G.
A1  - Raiteri, R.
A1  - Sampietro, M.
A1  - Dufva, M.
A1  - Emnéus, J.
T1  - A compact multifunctional microfluidic platform for exploring cellular dynamics in real-time using electrochemical detection
N2  - Downscaling of microfluidic cell culture and detection devices for electrochemical monitoring has mostly focused on miniaturization of the microfluidic chips which are often designed for specific applications and therefore lack functional flexibility. We present a compact microfluidic cell culture and electrochemical analysis platform with in-built fluid handling and detection, enabling complete cell based assays comprising on-line electrode cleaning, sterilization, surface functionalization, cell seeding, cultivation and electrochemical real-time monitoring of cellular dynamics. To demonstrate the versatility and multifunctionality of the platform, we explored amperometric monitoring of intracellular redox activity in yeast (Saccharomyces cerevisiae) and detection of exocytotically released dopamine from rat pheochromocytoma cells (PC12). Electrochemical impedance spectroscopy was used in both applications for monitoring cell sedimentation and adhesion as well as proliferation in the case of PC12 cells. The influence of flow rate on the signal amplitude in the detection of redox metabolism as well as the effect of mechanical stimulation on dopamine release were demonstrated using the programmable fluid handling capability. The here presented platform is aimed at applications utilizing cell based assays, ranging from e.g. monitoring of drug effects in pharmacological studies, characterization of neural stem cell differentiation, and screening of genetically modified microorganisms to environmental monitoring.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 289 
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-99492
ER  -