Origin of supposedly biogenic magnetite in the Martian meteorite Allan Hills 84001.

Abstract:

:Crystals of magnetite (Fe(3)O(4)) and periclase (MgO) in Fe-Mg-Ca carbonate in the Martian meteorite Allan Hills 84001 were studied by using transmission electron microscopy to understand their origin and evaluate claims that the magnetites were made by Martian microorganisms. In magnesian carbonate, periclase occurs as aggregates of crystals (grain size approximately equal to 3 nm) that are preferentially oriented with respect to the carbonate lattice. Larger periclase crystals approximately equal to 50 nm in size are commonly associated with voids of similar size. Periclase clearly formed by precipitation from carbonate as a result of partial decomposition and loss of CO(2). Magnetite occurs in more ferroan carbonate, and, like periclase, it is associated with voids and microfractures and the two oxides may be intermixed. Magnetite nanocrystals that are commonly euhedral and entirely embedded in carbonate are topotactically oriented with respect to the carbonate lattice, showing that they formed as solid-state precipitates. Magnetites in Fe-rich carbonate rims are not well oriented. These magnetites are generally more irregular in shape and diverse in size than the euhedral variety. All occurrences of magnetite and periclase are entirely consistent with in situ growth by solid-state diffusion as a result of carbonate decomposition during impact heating. Biogenic sources should not be invoked for any magnetites.

authors

Barber DJ,Scott ER

doi

10.1073/pnas.102045799

keywords:

subject

Has Abstract

pub_date

2002-05-14 00:00:00

pages

6556-61

issue

10

eissn

0027-8424

issn

1091-6490

pii

99/10/6556

journal_volume

99

pub_type

杂志文章
  • From the Cover: Antarctic climate signature in the Greenland ice core record.

    abstract::A numerical algorithm is applied to the Greenland Ice Sheet Project 2 (GISP2) dust record from Greenland to remove the abrupt changes in dust flux associated with the Dansgaard-Oeschger (D-O) oscillations of the last glacial period. The procedure is based on the assumption that the rapid changes in dust are associated...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.0708494104

    authors: Barker S,Knorr G

    更新日期:2007-10-30 00:00:00

  • Molecular cloning of human terminal deoxynucleotidyltransferase.

    abstract::A cDNA of the human terminal deoxynucleotidyltransferase (TdT; "terminal transferase," EC 2.7.7.31) was isolated from a human lymphoblastoid cell cDNA library in lambda gt 11 by using immunological procedures. Four inserts containing 723 to 939 base pairs were recloned in pBR322 for hybridization and preliminary seque...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.81.14.4363

    authors: Peterson RC,Cheung LC,Mattaliano RJ,Chang LM,Bollum FJ

    更新日期:1984-07-01 00:00:00

  • Single-molecule FRET studies on the cotranscriptional folding of a thiamine pyrophosphate riboswitch.

    abstract::Because RNAs fold as they are being synthesized, their transcription rate can affect their folding. Here, we report the results of single-molecule fluorescence studies that characterize the ligand-dependent cotranscriptional folding of the Escherichia coli thiM riboswitch that regulates translation. We found that the ...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1712983115

    authors: Uhm H,Kang W,Ha KS,Kang C,Hohng S

    更新日期:2018-01-09 00:00:00

  • Mitotic role for the Cdc28 protein kinase of Saccharomyces cerevisiae.

    abstract::The Cdc28 protein kinase functions in the G1 to S phase transition of the cell cycle of the budding yeast Saccharomyces cerevisiae. This is in contrast with observations of the homologous protein kinase from a variety of metazoans, where activity and function are associated with the G2 to M phase transition. We presen...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.87.15.5697

    authors: Reed SI,Wittenberg C

    更新日期:1990-08-01 00:00:00

  • The microwave background anisotropies: observations.

    abstract::Most cosmologists now believe that we live in an evolving universe that has been expanding and cooling since its origin about 15 billion years ago. Strong evidence for this standard cosmological model comes from studies of the cosmic microwave background radiation (CMBR), the remnant heat from the initial fireball. Th...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.95.1.29

    authors: Wilkinson D

    更新日期:1998-01-06 00:00:00

  • Analysis of human tumors and human malignant cell lines for BK virus-specific DNA sequences.

    abstract::Most humans in the United States have been infected with BK virus (BKV), a human papovavirus. Because BKV has oncogenic properties, we have investigated whether it may be a cause of human cancer. Basic principles of tumor virology imply that BKV-induced tumors should contain BKV DNA sequences. Therefore, we assayed (b...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.75.1.454

    authors: Wold WS,Mackey JK,Brackmann KH,Takemori N,Rigden P,Green M

    更新日期:1978-01-01 00:00:00

  • Family with sequence similarity 13, member A modulates adipocyte insulin signaling and preserves systemic metabolic homeostasis.

    abstract::Adipose tissue dysfunction is causally implicated in the impaired metabolic homeostasis associated with obesity; however, detailed mechanisms underlying dysregulated adipocyte functions in obesity remain to be elucidated. Here we searched for genes that provide a previously unknown mechanism in adipocyte metabolic fun...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1720475115

    authors: Wardhana DA,Ikeda K,Barinda AJ,Nugroho DB,Qurania KR,Yagi K,Miyata K,Oike Y,Hirata KI,Emoto N

    更新日期:2018-02-13 00:00:00

  • At least two non-antigen-binding molecules are required for signal transduction by the T-cell antigen receptor.

    abstract::In the T-cell somatic mutant J.CaM1, the T-cell antigen receptor complex is poorly coupled to the inositolphospholipid second messenger system; some antibodies against the invariant CD3 subunit of the receptor retain their agonist function in J.CaM1. Here we show by a combination of complementation assays that the mut...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.85.22.8613

    authors: Goldsmith MA,Dazin PF,Weiss A

    更新日期:1988-11-01 00:00:00

  • Junction ribonuclease: an activity in Okazaki fragment processing.

    abstract::The initiator RNAs of mammalian Okazaki fragments are thought to be removed by RNase HI and the 5'-3' flap endonuclease (FEN1). Earlier evidence indicated that the cleavage site of RNase HI is 5' of the last ribonucleotide at the RNA-DNA junction on an Okazaki substrate. In current work, highly purified calf RNase HI ...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.95.5.2244

    authors: Murante RS,Henricksen LA,Bambara RA

    更新日期:1998-03-03 00:00:00

  • Effects of lipid packing on polymorphic phase behavior and membrane properties.

    abstract::The self assembly of phospholipid molecules in the bilayer form was considered in terms of equivalent molecular shapes representing intermolecular forces. The equivalent size of each phospholipid headgroup was approximated by the net atomic volume plus the volume of the associated water molecules, which was derived fr...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.86.15.5825

    authors: Hui SW,Sen A

    更新日期:1989-08-01 00:00:00

  • Coherent phonon dynamics in spatially separated graphene mechanical resonators.

    abstract::Vibrational modes in mechanical resonators provide a promising candidate to interface and manipulate classical and quantum information. The observation of coherent dynamics between distant mechanical resonators can be a key step toward scalable phonon-based applications. Here we report tunable coherent phonon dynamics...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1916978117

    authors: Zhang ZZ,Song XX,Luo G,Su ZJ,Wang KL,Cao G,Li HO,Xiao M,Guo GC,Tian L,Deng GW,Guo GP

    更新日期:2020-03-17 00:00:00

  • Tumor-targeted IL-2 amplifies T cell-mediated immune response induced by gene therapy with single-chain IL-12.

    abstract::Induction, maintenance, and amplification of tumor-protective immunity after cytokine gene therapy is essential for the clinical success of immunotherapeutic approaches. We investigated whether this could be achieved by single-chain IL-12 (scIL-12) gene therapy followed by tumor-targeted IL-2 using a fusion protein co...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.96.15.8591

    authors: Lode HN,Xiang R,Duncan SR,Theofilopoulos AN,Gillies SD,Reisfeld RA

    更新日期:1999-07-20 00:00:00

  • Topological mechanics of gyroscopic metamaterials.

    abstract::Topological mechanical metamaterials are artificial structures whose unusual properties are protected very much like their electronic and optical counterparts. Here, we present an experimental and theoretical study of an active metamaterial--composed of coupled gyroscopes on a lattice--that breaks time-reversal symmet...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1507413112

    authors: Nash LM,Kleckner D,Read A,Vitelli V,Turner AM,Irvine WT

    更新日期:2015-11-24 00:00:00

  • Mechanical separation of the complementary strands of DNA.

    abstract::We describe the mechanical separation of the two complementary strands of a single molecule of bacteriophage lambda DNA. The 3' and 5' extremities on one end of the molecule are pulled progressively apart, and this leads to the opening of the double helix. The typical forces along the opening are in the range of 10-15...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.94.22.11935

    authors: Essevaz-Roulet B,Bockelmann U,Heslot F

    更新日期:1997-10-28 00:00:00

  • Construction of Tn5 lac, a transposon that fuses lacZ expression to exogenous promoters, and its introduction into Myxococcus xanthus.

    abstract::A promoterless trp-lac fusion fragment was inserted near one end of the bacterial transposon Tn5 in the correct orientation to fuse lacZ gene expression to promoters outside Tn5. The resulting transposon, Tn5 lac, retains the kanamycin-resistance gene of Tn5 and transposes in Escherichia coli at 6% the frequency of Tn...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.81.18.5816

    authors: Kroos L,Kaiser D

    更新日期:1984-09-01 00:00:00

  • Patterns of spread in biological invasions dominated by long-distance jump dispersal: Insights from Argentine ants.

    abstract::Invading organisms may spread through local movements (giving rise to a diffusion-like process) and by long-distance jumps, which are often human-mediated. The local spread of invading organisms has been fit with varying success to models that couple local population growth with diffusive spread, but to date no quanti...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.98.3.1095

    authors: Suarez AV,Holway DA,Case TJ

    更新日期:2001-01-30 00:00:00

  • A cascade of cytokines mediates mechanical inflammatory hypernociception in mice.

    abstract::The hypernociceptive effects of cytokines [TNF-alpha, keratinocyte-derived chemokine (KC), and IL-1beta] and their participation in carrageenan (Cg)-induced inflammatory hypernociception in mice were investigated. Nociceptor sensitization (hypernociception) was quantified with an electronic version of the von Frey fil...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.0409225102

    authors: Cunha TM,Verri WA Jr,Silva JS,Poole S,Cunha FQ,Ferreira SH

    更新日期:2005-02-01 00:00:00

  • SBE-TAGS: an array-based method for efficient single-nucleotide polymorphism genotyping.

    abstract::Generating human single-nucleotide polymorphisms (SNPs) is no longer a rate-limiting step for genetic studies of disease. The number of SNPs in public databases already exceeds 200,000, and the total is expected to exceed 1,000,000 within a year. Rather, progress is limited by the inability to genotype large numbers o...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.210394597

    authors: Hirschhorn JN,Sklar P,Lindblad-Toh K,Lim YM,Ruiz-Gutierrez M,Bolk S,Langhorst B,Schaffner S,Winchester E,Lander ES

    更新日期:2000-10-24 00:00:00

  • Selection of an RNA molecule that mimics a major autoantigenic epitope of human insulin receptor.

    abstract::Autoimmunity often involves the abnormal targeting of self-antigens by antibodies, leading to tissue destruction and other pathologies. This process could potentially be disrupted by small ligands that bind specifically to autoantibodies and inhibit their interaction with the target antigen. Here we report the identif...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.92.6.2355

    authors: Doudna JA,Cech TR,Sullenger BA

    更新日期:1995-03-14 00:00:00

  • Superantigenic character of an insert unique to SARS-CoV-2 spike supported by skewed TCR repertoire in patients with hyperinflammation.

    abstract::Multisystem Inflammatory Syndrome in Children (MIS-C) associated with COVID-19 is a newly recognized condition in children with recent severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. These children and adult patients with severe hyperinflammation present with a constellation of symptoms that st...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.2010722117

    authors: Cheng MH,Zhang S,Porritt RA,Noval Rivas M,Paschold L,Willscher E,Binder M,Arditi M,Bahar I

    更新日期:2020-10-13 00:00:00

  • Pericentromeric satellite repeat expansions through RNA-derived DNA intermediates in cancer.

    abstract::Aberrant transcription of the pericentromeric human satellite II (HSATII) repeat is present in a wide variety of epithelial cancers. In deriving experimental systems to study its deregulation, we observed that HSATII expression is induced in colon cancer cells cultured as xenografts or under nonadherent conditions in ...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1518008112

    authors: Bersani F,Lee E,Kharchenko PV,Xu AW,Liu M,Xega K,MacKenzie OC,Brannigan BW,Wittner BS,Jung H,Ramaswamy S,Park PJ,Maheswaran S,Ting DT,Haber DA

    更新日期:2015-12-08 00:00:00

  • Multidimensional epistasis and the disadvantage of sex.

    abstract::Sex is thought to facilitate accumulation of initially rare beneficial mutations by allowing simultaneous allele replacements at many loci. However, this advantage of sex depends on a restrictive assumption that the fitness of a genotype is determined by fitness potential, a single intermediate variable to which all l...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.211214298

    authors: Kondrashov FA,Kondrashov AS

    更新日期:2001-10-09 00:00:00

  • Molecular determinants of the modulation of cyclic nucleotide-activated channels by calmodulin.

    abstract::The action of calmodulin (CaM) on target proteins is important for a variety of cellular functions. We demonstrate here, however, that the presence of a CaM-binding site on a protein does not necessarily imply a functional effect. The alpha-subunit of the cGMP-gated cation channel of human retinal cones has a CaM-bind...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.96.23.13444

    authors: Grunwald ME,Zhong H,Lai J,Yau KW

    更新日期:1999-11-09 00:00:00

  • Cytotoxic T cells: Lyt phenotype and blocking of killing activity by Lyt antisera.

    abstract::WE REEXAMINED TWO QUESTIONS CONCERNING LYT ANTIGENS OF CYTOTOXIC T CELLS OF THE MOUSE: is Lyt-1 antigen expressed on cytotoxic effector cells and can cytotoxicity be blocked by antibody to Lyt antigens in the absence of added complement? A 3-hr (51)Cr-release assay with splenic effector cells and leukemia or myeloma t...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.76.4.1977

    authors: Nakayama E,Shiku H,Stockert E,Oettgen HF,Old LJ

    更新日期:1979-04-01 00:00:00

  • Androgens regulate the permeability of the blood-testis barrier.

    abstract::Within the mammalian testis, specialized tight junctions between somatic Sertoli cells create basal and apical polarity within the cells, restrict movement of molecules between cells, and separate the seminiferous epithelium into basal and adluminal compartments. These tight junctions form the basis of the blood-testi...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.0506084102

    authors: Meng J,Holdcraft RW,Shima JE,Griswold MD,Braun RE

    更新日期:2005-11-15 00:00:00

  • Structures of complexes comprised of Fischerella transcription factor HetR with Anabaena DNA targets.

    abstract::HetR is an essential regulator of heterocyst development in cyanobacteria. Many mutations in HetR render Anabaena incapable of nitrogen fixation. The protein binds to a DNA palindrome upstream of hetP and other genes. We have determined the crystal structures of HetR complexed with palindromic DNA targets, 21, 23, and...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1305971110

    authors: Kim Y,Ye Z,Joachimiak G,Videau P,Young J,Hurd K,Callahan SM,Gornicki P,Zhao J,Haselkorn R,Joachimiak A

    更新日期:2013-05-07 00:00:00

  • A transmissible plasmid controlling camphor oxidation in Pseudomonas putida.

    abstract::Earlier papers demonstrated an extensive genetic exchange among fluorescent Pseudomonads; this one documents for genes specifying enzymes of peripheral dissimilation an extrachromosomal array, segregation, and frequent interstrain transfer. An hypothesis is presented of a general mechanism for the formation and mainte...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.70.3.885

    authors: Rheinwald JG,Chakrabarty AM,Gunsalus IC

    更新日期:1973-03-01 00:00:00

  • ATP-driven Ca2+/H+ antiport in acid vesicles from Dictyostelium.

    abstract::Amoebae of the cellular slime mold Dictyostelium discoideum possess an extensive and dynamic endomembrane system that includes many types of acidic vacuoles. A light membrane fraction from Dictyostelium, rich in vacuolar-type H(+)-ATPase, has been described [Padh, H., Lavasa, M. & Steck, T.L. (1989) J. Cell Biol. 108,...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.89.17.8025

    authors: Rooney EK,Gross JD

    更新日期:1992-09-01 00:00:00

  • Ultrastructure of the first component of human complement: electron microscopy of the crosslinked complex.

    abstract::Electron micrographs are shown of the first component of human complement (C1) which has been crosslinked with a water-soluble carbodiimide to prevent dissociation into its C1q and C1r2C1s2 subunits. Two projections of the crosslinked molecule are seen in the electron micrographs, which are called "top" and "profile."...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.79.2.586

    authors: Strang CJ,Siegel RC,Phillips ML,Poon PH,Schumaker VN

    更新日期:1982-01-01 00:00:00

  • Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5.

    abstract::Three-dimensional topological insulators (3D TIs) represent states of quantum matters in which surface states are protected by time-reversal symmetry and an inversion occurs between bulk conduction and valence bands. However, the bulk-band inversion, which is intimately tied to the topologically nontrivial nature of 3...

    journal_title:Proceedings of the National Academy of Sciences of the United States of America

    pub_type: 杂志文章

    doi:10.1073/pnas.1613110114

    authors: Chen ZG,Chen RY,Zhong RD,Schneeloch J,Zhang C,Huang Y,Qu F,Yu R,Li Q,Gu GD,Wang NL

    更新日期:2017-01-31 00:00:00