Alexei Rozanov

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Formamide (NH2CHO) has been irradiated in condensed phase at 273 K by 11B-boron beams in the presence of powdered meteorites of the chondrite and stony-iron types. Relative to the controls (no radiation or no catalysis), a variegate panel of compounds was observed, including purine and pyrimidine nucleobases (uracil, cytosine, adenine, and guanine),(More)
Fossilized cyanobacteria(?) represented by trichomes enclosed in common sheaths were detected in early Proterozoic iron banded formations of the Kursk magnetic anomaly (limonite–martite ores of the Lebedinsky mine and iron banded formations of the Korobkovskoye deposit). These fossils morphologically similar to current representatives of the genus(More)
Precision ultrasonic measurements in binary gas systems provide continuous real-time monitoring of mixture composition and flow. Using custom microcontroller-based electronics, we have developed an ultrasonic instrument, with numerous potential applications, capable of making continuous high-precision sound velocity measurements. The instrument measures(More)
96 The weathering crusts are markers of continental sedimentation. The question of land colonization by bacteria is interesting in itself and studies in this field are rather fruitful. An active role of bacteria in the for mation of ancient weathering crusts has already been shown and land colonization by bacteria is proposed to start at the onset of the(More)
We describe a combined ultrasonic instrument for continuous gas flow measurement and simultaneous real-time binary gas mixture analysis. In the instrument, sound bursts are transmitted in opposite directions, which may be aligned with the gas flow path or at an angle to it, the latter configuration being the best adapted to high flow rates. Custom(More)
The ATLAS silicon tracker community foresees an upgrade from the present octafluoropropane (C<inf>3</inf>F<inf>8</inf>) evaporative cooling fluid &#x2014; to a composite fluid with a probable 10&#x2013;20% admixture of hexafluoroethane (C<inf>2</inf>F<inf>6</inf>). Such a fluid will allow a lower evaporation temperature and will afford the tracker silicon(More)
This study describes the retrieval of water vapor vertical distributions in the upper troposphere and lower stratosphere (UTLS) altitude range from space-borne observations of the scattered solar light made in limb viewing geometry. First results using measurements from SCIAMACHY (Scanning Imaging Absorption spectroMeter for Atmospheric CHartographY) aboard(More)
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