Meteorite Fail at Pueblito de Allende, Chihuahua, Mexico: Preliminary Information

King, E. A.; Schonfeld, E.; Richardson, Karl; Eldridge, J. S.

doi:10.1126/science.163.3870.928

Cited by 49 publications

(16 citation statements)

References 1 publication

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“…To monitor every stage of the analysis, parallel experiments were conducted on an interior sample from a 6-kg piece of the Pueblito de Allende meteorite (3), and a sand blank was prepared by heating a sample of Ottawa sand for 48 hours at 1000°C. To minimize contamination, the analyses were carried out in a clean laboratory ventilated with filtered air, and the entire sequence of solvent extractions of the lunar dust was accomplished in a single glass vessel.…”

Section: Methodsmentioning

confidence: 99%

Search for Organic Compounds in the Lunar Dust from the Sea of Tranquillity

Ponnamperuma

Kvenvolden

Chang

et al. 1970

Science

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A sample of lunar dust was examined for organic compounds. Carbon detected in concentrations of 157 micrograms per gram had a delta(13)C per mil (PDB) value of + 20. Treatment with hydrochloric acid yielded hydrocarbons of low molecular weight, suggesting the presence of carbides. The gas chromatogram of the acylated and esterified derivatives of the hydrolyzate was similar to that obtained for the Pueblito de Allende meteorite. There were no detectable amounts of extractable high-molecular-weight alkanes, aromatic hydrocarbons, isoprenoid hydrocarbons, normal alkanes, fatty acids, amino acids, sugars, or nucleic acid bases. Traces of porphyrins were found, perhaps arising from rocket exhaust materials.

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Section: Methodsmentioning

confidence: 99%

Search for Organic Compounds in the Lunar Dust from the Sea of Tranquillity

Ponnamperuma

Kvenvolden

Chang

et al. 1970

Science

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“…The Allende meteorite contains ϳ0.3% of C (King et al, 1969), most of which is present as inorganic C rather than as organic polymer (Breger et al, 1972;Vis et al, 2002). Han et al (1969) found that the abundance of organic matter that was soluble to solvents was a few orders of magnitude smaller in the Allende meteorite than in other carbonaceous chondrites.…”

Section: Carbonaceous Nature Of Qmentioning

confidence: 98%

“…In addition, C and N isotopic ratios of carbonaceous grains from the Allende floating fraction A1 have been analyzed (Amari and Matsuda, 1998). Second, among carbonaceous chondrites, which contain abundant trapped noble gases, the C concentration in the Allende meteorite (CV) is low (0.3%) (King et al, 1969) compared with those in C1 and CM carbonaceous chondrites (2-4%) (Wasson, 1985). In addition, most C in the meteorite is present as inorganic C rather than as organic polymer (Breger et al, 1972;Vis et al, 2002).…”

Section: Sample Preparationmentioning

confidence: 99%

An attempt to separate Q from the Allende meteorite by physical methods

Amari¹,

Zaizen

Matsuda

2003

Geochimica et Cosmochimica Acta

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“…The Allende meteorite, which fell in Chihuahua, México, on 9 February 1969 at 1:05 a.m. (26°58′N, 105°19′W; King et al, 1969), is ~4.567 b.y. old and the largest carbonaceous chondrite ever found on Earth (2 cubic tons).…”

Section: Allende Meteoritementioning

confidence: 99%

Biological dissolution and activity of the Allende meteorite

Cervini-Silva

Nieto‐Camacho

Cornejo-Garrido

et al. 2013

Geological Society of America Bulletin

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This paper reports on the effect of the Allende meteorite on the integrity of biological material and addresses the question whether it can induce cell damage via oxidative stressand cell mortality. The reaction mechanisms addressed herein are studied using electronparamagnetic resonance spectroscopy (EPR), high-resolution transmission electron microscopy, scanning electron microscopy and energy dispersive spectroscopy, high-resolution X-ray diffraction, and the assays for thiobarbituric acid reactive substances (TBARS) and cell viability using 3-(4,5)-dimethylthiazol-2-yel-2, 5-diphenyltetrazolium bromide (MTT bromide). As determined by the TBARS assay, Allende specimens induced cell damage via oxidative stress. The contents of TBARS in suspensions containing 1000 ppm of Allende and Fe 1-x S were 6.8 ± 0.7 and 5.8 ± 0.6 nmol/mg protein, respectively. EPR experiments conducted on reaction mixtures containing Allende, 5,5-dimethyl-1pyrroline-N-oxide (DMPO), and H 2 O 2 showed a quartet signal, a 1:2:2:1 intensity, and hyperfi ne coupling constants corresponding to a N = 1.49 mT and a H = 1.49 mT, a signature of the DMPO-OH adduct. The intensity of the signal depended on the concentration of the solids in suspension, while the formation of DMPO-OH was limited by H 2 O 2 .Experiments were conducted to test for the production of the DMPO-OH adduct from ferric ions, and the plausible generation of HO • . The role of ethanol (CH 3 CH 2 OH) as scavenger of HO • in Allende-DMPO suspensions was addressed. Results showed a six-line spectra, with hyperfi ne coupling constants a N = 15.8 G, a H = 22.6 G, and g = 2.0059, consistent with the formation of the DMPO-CH(OH)-CH 3 adduct, but not DMPO-OCH 2 CH 3 . We explain these fi ndings as the result of formation of HO • onto (or in proximity to) the mineral surface, with CH 3 CH 2 OH competing with DMPO for HO ∞ , and ferric iron playing a lesser role in DMPO transformation. Our fi ndings are congruent with reported radical-scavenging experiments for pyrite under anoxic conditions, concluding the formation of HO ∞ at surface defect sites. Experiments conducted in Allende-desferrioxamine B(DFO-B) suspensions showed the inhibition of the formation of HO • , by means of decreases in the DMPO-OH adduct signal, accounted for by the reaction between Fe(II)and HO • to form Fe(III) and competing reaction mechanisms at the structural Fe centers, confi rming that the production of HO ∞ radicals is associated with iron centers and contributes to mineral dissolution. Small-sized magnetite domains present were recognized as catalytic sites for the production of HO ∞ radicals. The γ-Fe 3 O 4 domains present in the Allende matrix exhibited a submicron range, an elongated-hexagonal habit, and a high degree of crystallinity, supporting the presence of biogenic γ-Fe 3 O 4 . Cell viability was found to be susceptible to the distribution and atomic environment of structural Fe.

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Meteorite Fail at Pueblito de Allende, Chihuahua, Mexico: Preliminary Information

Cited by 49 publications

References 1 publication

Search for Organic Compounds in the Lunar Dust from the Sea of Tranquillity

Search for Organic Compounds in the Lunar Dust from the Sea of Tranquillity

An attempt to separate Q from the Allende meteorite by physical methods

Biological dissolution and activity of the Allende meteorite

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