TY  - JOUR
A1  - Temme, Fabian
A1  - Adam, Jan
A1  - Ahnen, Max L.
A1  - Baack, Dominik
A1  - Balbo, Matteo
A1  - Bergmann, Matthias
A1  - Biland, Adrian
A1  - Blank, Michael
A1  - Bretz, Thomas
A1  - Brügge, Kai A.
A1  - Buss, Jens
A1  - Dmytriiev, Anton
A1  - Dorner, Daniela
A1  - Einecke, Sabrina
A1  - Hempfling, Christina
A1  - Hildebrand, Dorothee
A1  - Hughes, Gareth
A1  - Linhoff, Lena
A1  - Mannheim, Karl
A1  - Müller, Sebastian
A1  - Neise, Dominik
A1  - Neronov, Andrii
A1  - Nöthe, Max
A1  - Paravac, Aleksander
A1  - Pauss, Felicitas
A1  - Rhode, Wolfgang
A1  - Shukla, Amit
A1  - Thaele, Julia
A1  - Walter, Roland
T1  - Long-Term monitoring of bright blazars in the multi-GeV to TeV range with FACT
JF  - Galaxies
N2  - Blazars like Markarian 421 or Markarian 501 are active galactic nuclei (AGN), with their jets orientated towards the observer. They are among the brightest objects in the very high energy (VHE) gamma ray regime (>100 GeV). Their emitted gamma-ray fluxes are extremely variable, with changing activity levels on timescales between minutes, months, and even years. Several questions are part of the current research, such as the question of the emission regions or the engine of the AGN and the particle acceleration. A dedicated longterm monitoring program is necessary to investigate the properties of blazars in detail. A densely sampled and unbiased light curve allows for observation of both high and low states of the sources, and the combination with multi-wavelength observation could contribute to the answer of several questions mentioned above. FACT (First G-APD Cherenkov Telescope) is the first operational telescope using silicon photomultiplier (SiPM, also known as Geigermode—Avalanche Photo Diode, G-APD) as photon detectors. SiPM have a very homogenous and stable longterm performance, and allow operation even during full moon without any filter, leading to a maximal duty cycle for an Imaging Air Cherenkov Telescope (IACT). Hence, FACT is an ideal device for such a longterm monitoring of bright blazars. A small set of sources (e.g., Markarian 421, Markarian 501, 1ES 1959+650, and 1ES 2344+51.4) is currently being monitored. In this contribution, the FACT telescope and the concept of longterm monitoring of bright blazars will be introduced. The results of the monitoring program will be shown, and the advantages of densely sampled and unbiased light curves will be discussed.
KW  - Imaging Air Cherenkov Telescope
KW  - First G-APD Cherenkov Telescope
KW  - very high energy gamma rays
KW  - long-term monitoring
KW  - silicon photo multiplier
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-198088
SN  - 2075-4434
VL  - 5
IS  - 1
PB  - MDPI
ER  - 
TY  - JOUR
A1  - Temme, Sebastian
A1  - Friebe, Daniela
A1  - Schmidt, Timo
A1  - Poschmann, Gereon
A1  - Hesse, Julia
A1  - Steckel, Bodo
A1  - Stühler, Kai
A1  - Kunz, Meik
A1  - Dandekar, Thomas
A1  - Ding, Zhaoping
A1  - Akhyari, Payam
A1  - Lichtenberg, Artur
A1  - Schrader, Jürgen
T1  - Genetic profiling and surface proteome analysis of human atrial stromal cells and rat ventricular epicardium-derived cells reveals novel insights into their cardiogenic potential
JF  - Stem Cell Research
N2  - Epicardium-derived cells (EPDC) and atrial stromal cells (ASC) display cardio-regenerative potential, but the molecular details are still unexplored. Signals which induce activation, migration and differentiation of these cells are largely unknown. Here we have isolated rat ventricular EPDC and rat/human ASC and performed genetic and proteomic profiling. EPDC and ASC expressed epicardial/mesenchymal markers (WT-1, Tbx18, CD73,CD90, CD44, CD105), cardiac markers (Gata4, Tbx5, troponin T) and also contained phosphocreatine. We used cell surface biotinylation to isolate plasma membrane proteins of rEPDC and hASC, Nano-liquid chromatography with subsequent mass spectrometry and bioinformatics analysis identified 396 rat and 239 human plasma membrane proteins with 149 overlapping proteins. Functional GO-term analysis revealed several significantly enriched categories related to extracellular matrix (ECM), cell migration/differentiation, immunology or angiogenesis. We identified receptors for ephrin and growth factors (IGF, PDGF, EGF, anthrax toxin) known to be involved in cardiac repair and regeneration. Functional category enrichment identified clusters around integrins, PI3K/Akt-signaling and various cardiomyopathies. Our study indicates that EPDC and ASC have a similar molecular phenotype related to cardiac healing/regeneration. The cell surface proteome repository will help to further unravel the molecular details of their cardio-regenerative potential and their role in cardiac diseases.
KW  - Biology
KW  - Epicardium-derived cells
KW  - Human atrial stromal cells
KW  - Cell surface proteomics
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-172716
VL  - 25
ER  -