THE CHEMICAL ACTIVITIES OF THE VIKING BIOLOGY EXPERIMENTS AND THE ARGUMENTS FOR THE PRESENCE OF SUPEROXIDES, PEROXIDES, γ-Fe2O3 AND CARBON SUBOXIDE POLYMER IN THE MARTIAN SOIL

Abstract Lipids are among the organic substances that can work as biosignatures, indicating life in an environment. We present an experimental investigation concerning analysis of lipids from a microbial source deposited on the Mars Global Simulant (MGS-1) regolith by geomatrix-assisted laser desorption/ionization-mass spectrometry (GALDI-MS). Our results indicate that lipids from intact microbial cells of a black yeast strain can be detected in these mimetic samples of Martian soil. These lipid molecules are predominantly associated with the occurrence of adducts in the GALDI-MS spectra. The results can be helpful in the planning of future planetary missions.

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The electronic structure of carbones revealed: insights from valence bond theory

Physical Chemistry Chemical Physics ◽

10.1039/d0cp05007e ◽

2021 ◽

Vol 23 (5) ◽

pp. 3327-3334

Author(s):

Remco W. A. Havenith ◽

Ana V. Cunha ◽

Johannes E. M. N. Klein ◽

Francesca Perolari ◽

Xintao Feng

Keyword(s):

Electronic Structure ◽

Valence Bond ◽

Carbon Suboxide ◽

Valence Bond Theory ◽

Bond Theory

Valence bond theory reveals the nature of the OC–C bond in carbon suboxide and related allene compounds.

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Carbon Suboxide

Journal of the American Chemical Society ◽

10.1021/ja01329a047 ◽

1933 ◽

Vol 55 (2) ◽

pp. 757-759 ◽

Cited By ~ 18

Author(s):

Charles D. Hurd ◽

Forrest D. Pilgrim

Keyword(s):

Carbon Suboxide

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Electromagnetic measurements on Martian soil analogs: Implications for MARSIS and SHARAD radars in detecting subsoil water

Planetary and Space Science ◽

10.1016/j.pss.2006.06.002 ◽

2007 ◽

Vol 55 (1-2) ◽

pp. 193-202 ◽

Cited By ~ 8

Author(s):

Annamaria Cereti ◽

Giuliano Vannaroni ◽

Davide Del Vento ◽

Elena Pettinelli

Keyword(s):

Subsoil Water ◽

Martian Soil ◽

Electromagnetic Measurements

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Modification of HAM/3 excitation energies for ΠΠ* transitions of linear molecules

Canadian Journal of Chemistry ◽

10.1139/v80-270 ◽

1980 ◽

Vol 58 (16) ◽

pp. 1687-1690 ◽

Cited By ~ 8

Author(s):

Delano P. Chong

Keyword(s):

Excitation Energy ◽

Explicit Expression ◽

Excited States ◽

Configuration Interaction ◽

Excitation Energies ◽

Carbon Suboxide ◽

Numerical Examples ◽

Energy Correction ◽

Linear Molecules ◽

Configuration Interaction Calculations

The excitation energies calculated by the HAM/3 procedure for ΠΠ* transitions in linear molecules can be internally inconsistent by as much as ± 0.6 eV. In the recent study by Åsbrink etal., the problem was avoided by adopting Recknagel's expressions and requiring the proper average ΠΠ* excitation energy. In this paper, we trace the small inconsistency back to its origin in HAM/3 theory and derive the analytical expression for the energy correction as well as Recknagel's formulas. Numerical examples studied include all seven linear molecules investigated by Åsbrink etal. The explicit expression for the correction enables us to perform meaningful configuration-interaction calculations on the excited states, as illustrated by the carbon suboxide molecule.

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