Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Meteoritic Proteins with Glycine, Iron and Lithium   We report that polymer amide [1] with a protein backbone of mainly glycine
units and iron is present in the CV3 meteorites Acfer 086, Allende and KABA.
The evidence for this is from particles of these meteorites after Folch
extraction being analyzed by MALDI mass spectrometry and from the 3D physical
structures that form in the various Folch solvent phases. The two physical
forms we observe are branching rods and entrapping spheres on the 100micron
scale. Two potential molecular structures of polymer amide are presented in
this report. One we term hemolithin of mass 2320Da, contains glycine,
hydroxy-glycine, Fe, O and Li. The other, we term hemoglycin of mass 1494Da is
of glycine, hydroxy-glycine, Fe and O. Hemoglycin is connected covalently in
triplets by silicon to form a triskelion. Analysis of the complete spectrum of
isotopes associated with each molecular fragment shows very high 2H enhancement
above terrestrial averaging 25,700 parts per thousand (sigma = 3,500, n=15),
confirming extra-terrestrial origin and hence the existence of these molecules
within the asteroid parent body of the CV3 meteorite class. The hemoglycin
triskelia join via silicon bonds into an extended lattice, as seen in mass
spectrometry of lattice fragments at m/z 4641 and above [2]. The identification
of hemolithin and hemoglycin required careful methodology at room temperature
with the minimum of steps up to mass spectrometry analysis ensuring that only
the laser step fragmented the molecules. The 3D structures were imaged through
permanently closed Folch extraction V-vials at a magnification of 10.

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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int