Abstract:
:Oxygen and silicon isotope compositions of cherts and studies of protein evolution have been interpreted to reflect ocean temperatures of 55-85 degrees C during the early Palaeoarchaean era ( approximately 3.5 billion years ago). A recent study combining oxygen and hydrogen isotope compositions of cherts, however, makes a case for Archaean ocean temperatures being no greater than 40 degrees C (ref. 5). Ocean temperature can also be assessed using the oxygen isotope composition of phosphate. Recent studies show that (18)O:(16)O ratios of dissolved inorganic phosphate (delta(18)O(P)) reflect ambient seawater temperature as well as biological processing that dominates marine phosphorus cycling at low temperature. All forms of life require and concentrate phosphorus, and as a result of biological processing, modern marine phosphates have delta(18)O(P) values typically between 19-26 per thousand (VSMOW), highly evolved from presumed source values of approximately 6-8 per thousand that are characteristic of apatite in igneous rocks and meteorites. Here we report oxygen isotope compositions of phosphates in sediments from the 3.2-3.5-billion-year-old Barberton Greenstone Belt in South Africa. We find that delta(18)O(P) values range from 9.3 per thousand to 19.9 per thousand and include the highest values reported for Archaean rocks. The temperatures calculated from our highest delta(18)O(P) values and assuming equilibrium with sea water with delta(18)O = 0 per thousand (ref. 12) range from 26 degrees C to 35 degrees C. The higher delta(18)O(P) values are similar to those of modern marine phosphate and suggest a well-developed phosphorus cycle and evolved biologic activity on the Archaean Earth.
journal_name
Naturejournal_title
Natureauthors
Blake RE,Chang SJ,Lepland Adoi
10.1038/nature08952subject
Has Abstractpub_date
2010-04-15 00:00:00pages
1029-32issue
7291eissn
0028-0836issn
1476-4687pii
nature08952journal_volume
464pub_type
历史文章,杂志文章相关文献
NATURE文献大全abstract::Neptune has five narrow ring arcs, spanning about 40 degrees in longitude, which are apparently confined against the rapid azimuthal and radial spreading that normally results from inter-particle collisions. A gravitational resonance based on the vertical motion of the nearby neptunian moon Galatea was proposed to exp...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/417045a
更新日期:2002-05-02 00:00:00
abstract::Activation of a visual pigment molecule to initiate phototransduction requires a minimum energy, Ea, that need not be wholly derived from a photon, but may be supplemented by heat. Theory predicts that absorbance at very long wavelengths declines with the fraction of molecules that have a sufficient complement of ther...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/35003242
更新日期:2000-01-13 00:00:00
abstract::Our current understanding of immunology was largely defined in laboratory mice, partly because they are inbred and genetically homogeneous, can be genetically manipulated, allow kinetic tissue analyses to be carried out from the onset of disease, and permit the use of tractable disease models. Comparably reductionist ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature17655
更新日期:2016-04-28 00:00:00
abstract::The spread of antibiotic resistance in Gram-negative bacteria has sustained a continuing search for new agents with antibacterial activity against this important class of bacterial pathogen. Because the biosynthesis of lipopolysaccharide (LPS) is unique to Gram-negative bacteria and required by them for growth and vir...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/329162a0
更新日期:1987-09-10 00:00:00
abstract::Defects in insulin signalling are among the most common and earliest defects that predispose an individual to the development of type 2 diabetes. MicroRNAs have been identified as a new class of regulatory molecules that influence many biological functions, including metabolism. However, the direct regulation of insul...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature10112
更新日期:2011-06-08 00:00:00
abstract::The solar wind blows outward from the Sun and forms a bubble of solar material in the interstellar medium. The termination shock occurs where the solar wind changes from being supersonic (with respect to the surrounding interstellar medium) to being subsonic. The shock was crossed by Voyager 1 at a heliocentric radius...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature07024
更新日期:2008-07-03 00:00:00
abstract::On the basis of their primary structure, the lysine-rich histones are a unified family of proteins. Each has an amino acid chain which falls into three distinct domains. Only the central domain (approximately 80 residues) is in a folded conformation. It is protected from trypsin digestion in chromatin and corresponds ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/288675a0
更新日期:1980-12-25 00:00:00
abstract::The c-myc gene product is a nuclear protein expressed in a wide variety of cell types. It has been implicated in the control of normal cell growth as well as transformation, but its exact function is unknown. When the human promyelocytic leukaemia cell line HL60 is treated with retinoic acid, the cells differentiate i...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/321702a0
更新日期:1986-06-12 00:00:00
abstract::Change history: In Fig. 1b and c of this Letter, the inset times in the DIC and GFP microscopy images should be in minutes ('min') instead of seconds ('s'). This has not been corrected online. ...
journal_title:Nature
pub_type: 已发布勘误
doi:10.1038/s41586-019-1327-8
更新日期:2019-07-01 00:00:00
abstract::Wolbachia is a common maternally inherited bacterial symbiont able to induce crossing sterilities known as cytoplasmic incompatibility (CI) in insects. Wolbachia-modified sperm are unable to complete fertilization of uninfected ova, but a rescue function allows infected eggs to develop normally. By providing a reprodu...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature03629
更新日期:2005-07-14 00:00:00
abstract::Through their functional diversification, distinct lineages of CD4(+) T cells can act to either drive or constrain immune-mediated pathology. Transcription factors are critical in the generation of cellular diversity, and negative regulators antagonistic to alternate fates often act in conjunction with positive regula...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature12199
更新日期:2013-06-27 00:00:00
abstract::Oxygen isotope analyses of Spondylus shells from neolithic sites suggest that the source for the shells used as ornaments in the Balkans and central Europe during the fourth millennium BC was the Aegean and not the Black Sea. The trade in Spondylus may have taken the form of an exchange of gifts. ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/2281062a0
更新日期:1970-12-12 00:00:00
abstract::MicroRNAs (miRNAs) are endogenous approximately 22-nucleotide RNAs that mediate important gene-regulatory events by pairing to the mRNAs of protein-coding genes to direct their repression. Repression of these regulatory targets leads to decreased translational efficiency and/or decreased mRNA levels, but the relative ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature09267
更新日期:2010-08-12 00:00:00
abstract:: ...
journal_title:Nature
pub_type: 评论,新闻
doi:10.1038/d41586-018-07165-8
更新日期:2018-11-01 00:00:00
abstract::Some plasmid DNAs, when maintained in wild-type Escherichia coli strains, form high levels of oligomeric species while others remain primarily monomers. One explanation of this observation is that the plasmids that do not form circular oligomers lack a DNA sequence necessary for the formation or maintenance of circula...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/303256a0
更新日期:1983-05-19 00:00:00
abstract::Caenorhabditis elegans senses environmental signals through ciliated sensory neurons located primarily in sensory organs in the head and tail. Cilia function as sensory receptors, and mutants with defective sensory cilia have impaired sensory perception. Cilia are membrane-bound microtubule-based structures and in C. ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/45544
更新日期:1999-12-16 00:00:00
abstract::Antiviral T cells are thought to regulate whether hepatitis C virus (HCV) and human immunodeficiency virus (HIV) infections result in viral control, asymptomatic persistence or severe disease, although the reasons for these different outcomes remain unclear. Recent genetic evidence, however, has indicated a correlatio...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature10624
更新日期:2011-11-20 00:00:00
abstract::It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55-45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding evaporation at high latitudes. Little f...
journal_title:Nature
pub_type: 历史文章,杂志文章
doi:10.1038/nature04692
更新日期:2006-06-01 00:00:00
abstract::Cyclin-dependent kinase 5 (Cdk5) and its neuron-specific regulator p35 are essential for neuronal migration and for the laminar configuration of the cerebral cortex. In addition, p35/Cdk5 kinase concentrates at the leading edges of axonal growth cones and regulates neurite outgrowth in cortical neurons in culture. The...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/26034
更新日期:1998-09-10 00:00:00
abstract::D-type cyclins, in association with the cyclin-dependent kinases Cdk4 or Cdk6, promote progression through the G1 phase of the cell cycle by phosphorylating the retinoblastoma protein (RB). The activities of Cdk4 and Cdk6 are constrained by inhibitors such as p16, the product of the CDKN2 gene on human chromosome 9p21...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/375503a0
更新日期:1995-06-08 00:00:00
abstract::The debate over human origins has focused on two competing theories. The single African origin model holds that anatomically modern Homo sapiens evolved in Africa 100,000-200,000 years ago. Members of this population migrated out of Africa, replacing archaic human groups through Asia and Europe, with racial differenti...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/368452a0
更新日期:1994-03-31 00:00:00
abstract::T-cell clones that grow continuously in tissue culture have become a major tool for studying the properties of T lymphocytes. It is therefore important to know to what extent such clones resemble their normal counterparts. Several reports have appeared recently which demonstrate that long-term T-cell lines may lose th...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/308367a0
更新日期:1984-03-22 00:00:00
abstract::Water masers are found in dense molecular clouds closely associated with supermassive black holes at the centres of active galaxies. On the basis of the understanding of the local water-maser luminosity function, it was expected that masers at intermediate and high redshifts would be extremely rare. However, galaxies ...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature07544
更新日期:2008-12-18 00:00:00
abstract::The detection of electron spins associated with single defects in solids is a critical operation for a range of quantum information and measurement applications under development. So far, it has been accomplished for only two defect centres in crystalline solids: phosphorus dopants in silicon, for which electrical rea...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature12081
更新日期:2013-05-02 00:00:00
abstract::Climate change is predicted to increase both drought frequency and duration, and when coupled with substantial warming, will establish a new hydroclimatological model for many regions. Large-scale, warm droughts have recently occurred in North America, Africa, Europe, Amazonia and Australia, resulting in major effects...
journal_title:Nature
pub_type: 历史文章,杂志文章
doi:10.1038/nature11836
更新日期:2013-02-21 00:00:00
abstract::In response to adenosine 5'-diphosphate, the P2Y1 receptor (P2Y1R) facilitates platelet aggregation, and thus serves as an important antithrombotic drug target. Here we report the crystal structures of the human P2Y1R in complex with a nucleotide antagonist MRS2500 at 2.7 Å resolution, and with a non-nucleotide antago...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature14287
更新日期:2015-04-16 00:00:00
abstract::Humoral immune responses to immunization and infection and susceptibilities to antibody-mediated autoimmunity are generally lower in males1-3. However, the mechanisms underlying such sexual dimorphism are not well understood. Here we show that there are intrinsic differences between the B cells that produce germinal c...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/s41586-019-1873-0
更新日期:2020-01-01 00:00:00
abstract::Extant vertebrates form two clades, the jawless Cyclostomata (lampreys and hagfishes) and the jawed Gnathostomata (all other vertebrates), with contrasting facial architectures. These arise during development from just a few key differences in the growth patterns of the cranial primordia: notably, the nasal sacs and h...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature12980
更新日期:2014-03-27 00:00:00
abstract::A wide range of receptors are located at the blood sinusoidal aspect of the hepatocyte plasma membrane. Many circulating ligands that bind to receptors on the cell surfaces are interiorized along two pathways. Asialoglycoproteins are transferred from the plasma membrane to lysosomes and degraded, whereas immunoglobuli...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/298398a0
更新日期:1982-07-22 00:00:00
abstract::Mitochondrial genomes (mitochondrial DNA, mtDNA) encode essential oxidative phosphorylation (OXPHOS) components. Because hundreds of mtDNAs exist per cell, a deletion in a single mtDNA has little impact. However, if the deletion genome is enriched, OXPHOS declines, resulting in cellular dysfunction. For example, Kearn...
journal_title:Nature
pub_type: 杂志文章
doi:10.1038/nature17989
更新日期:2016-05-19 00:00:00