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Klingelhöfer, G.; Bernhardt, B.; Foh, J.; Bonnes, U.; Rodionov, D.; Souza, P. A. de; Schröder, Christian; Gellert, R.; Kane, S. N.; Gütlich, Philipp; Kankeleit, E.

doi:10.1023/a:1025444209059

Cited by 34 publications

(9 citation statements)

References 5 publications

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“…It is sometimes important to have ability to collect spectra at several SCA windows. Only few spectrometers have this ability currently, and those are very specialized units like the MIMOS II [13].…”

Section: Introductionmentioning

confidence: 99%

Early Design Stage of the MsAa-4 Mössbauer Spectrometer

et al. 2008

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Entirely new Mössbauer spectrometer MsAa-4 is currently under design and construction. New features as compared to the basic features of the previous generation MsAa-3 spectrometer could be summarized as follows. Completely digital processing of the γ-ray detector signal beyond the Gaussian shape filter/amplifier is to be implemented. The spectrometer is going to be able to accommodate external multiple detector heads. One could collect simultaneously up to 128 γ-ray spectra in 16384 channels of 32-bit each and up to 512 Mössbauer spectra in 4096 channels of 32-bit each provided the proper external multiple detector head is used. The count-rate per single detector is limited to about 10 5 counts per second total. Improved precision of the reference function from 12-bit to 16-bit is to be provided. The reference function is stored in 8192 channels per complete cycle. Addition of the random noise to the reference corner prism of the Michelson-Morley calibration inteferometer is to be introduced to avoid spurious fringes due to the phase lock-up. Integrated universal temperature controller being able to use variety of the temperature sensors is to be interconnected with the proper spectrometer. The spectrometer is now a stand-alone network device as it is equipped with the Ethernet connection to the outside world. Modular design and use of the strict standards allows easy reconfiguration for other applications than the Mössbauer spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Early Design Stage of the MsAa-4 Mössbauer Spectrometer

et al. 2008

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show abstract

“…It is sometimes important to have the ability to collect spectra at several SCA windows. Only few spectrometers have this ability currently, and those are very specialized units like the MIMOS II [13].…”

Section: Introductionmentioning

confidence: 99%

Design of the MsAa-4 Mössbauer Spectrometer

Błachowski¹,

Ruebenbauer²,

Żukrowski³

et al. 2008

AIP Conference Proceedings

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An entirely new Mössbauer spectrometer MsAa-4 is currently being under design and construction. New features as compared to the basic features of the previous generation MsAa-3 spectrometer could be summarized as follows. Completely digital processing of the γ-ray detector signal beyond the Gaussian shape filter/amplifier is to be implemented. The spectrometer is going to be able to accommodate external multiple detector heads. Up to 128 γray spectra in 16384 channels of 32-bit each and up to 512 Mössbauer spectra in 4096 channels of 32-bit each could be collected simultaneously, provided the proper external multiple detector head is used. The count-rate per single detector is limited to about 5 10 counts per second in total. Improved precision of the reference function from 12-bit to 16-bit is to be provided. The reference function is stored in 8192 channels per a complete cycle. Addition of the random noise to the reference corner prism of the Michelson-Morley calibration interferometer is to be introduced to avoid spurious fringes due to the phase lock-up. An integrated universal temperature controller being able to use a variety of the temperature sensors is to be interconnected properly with the spectrometer. The spectrometer is now a stand-alone network device as it is equipped with the Ethernet connection to the outside world. Fast and high precision digital oscilloscope is to be incorporated to the spectrometer as the intrinsic unit. This oscilloscope could monitor signals at various crucial points of the internal spectrometer electronics. Modular design and use of the strict standards allows easy reconfiguration for other applications than Mössbauer spectroscopy.

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“…In addition, the Rover, Spirit, as well as remotely sensed data from the various current orbitors, also have shown evidence of past acid brines in other locations besides Meridiani Planum on Mars (5) . This evidence includes sedimentary rocks composed of fine-grained siliciclastic materials, sulfate mineralsnotably calcium sulfate, magnesium sulfate and jarosite, and hematite (6)(7)(8)(9) . Thus, it is likely that there were acid saline groundwater and shallow surface water on Mars.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a moderately halo-acidophilic bacterium isolated from Lake Brown, western Australia

Mormile

Hong

Adams

et al. 2007

Instruments, Methods, and Missions for Astrobiology X

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Compared to prevalent alkaline to neutral hypersaline environments, acidic hypersaline environments have been scarcely studied. However, they hold interest to many researchers in that these environments have similar geological and geochemical characteristics as those found in lithified strata on Mars. Fieldwork indicated that Lake Brown, located in Western Australia, possessed pH values of 3.1-4.5 and salinity between 13.0-23.0%. Water column, groundwater, and sediment samples were collected from the lake during the austral winter of 2005. These samples were analyzed with both traditional culture and molecular methods. Modified growth media and minimal media were designed to match the composition (Cl, Na, Mg, SO4, K, Ca, and Br) of Lake Brown surface and ground waters for the enrichment of microorganisms. One of the isolates obtained, Brown 1, can grow in media that possesses pH values of 3-7 with optimal growth at pH 4, salinity that ranged from 5% to saturation with optimal growth at 5% and could grow under temperatures that ranged from 20ºC to 65ºC with optimal grow occurring at 37ºC. The isolate's optimum growth conditions are similar to those found in Lake Brown. The isolate is a Gram-negative rod that forms yellow colonies on 17% Phytogel. Its 16S rRNA gene can be amplified with bacterial primers but not with archaeal primers. Its 16S rRNA gene sequence suggests that the isolate is a gamma proteobacterium. Studies on organisms isolated from environments such as Lake Brown, an acid hypersaline lake, can provide an opportunity to both expand our knowledge of terrestrial extremophiles and gain insight on the possible forms of life that might have existed on Mars.

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Cited by 34 publications

References 5 publications

Early Design Stage of the MsAa-4 Mössbauer Spectrometer

Early Design Stage of the MsAa-4 Mössbauer Spectrometer

Design of the MsAa-4 Mössbauer Spectrometer

Characterization of a moderately halo-acidophilic bacterium isolated from Lake Brown, western Australia

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