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Items: 1 to 50 of 54

1.

SIMS analyses of the oldest known assemblage of microfossils document their taxon-correlated carbon isotope compositions.

Schopf JW, Kitajima K, Spicuzza MJ, Kudryavtsev AB, Valley JW.

Proc Natl Acad Sci U S A. 2018 Jan 2;115(1):53-58. doi: 10.1073/pnas.1718063115. Epub 2017 Dec 18.

PMID:
29255053
2.

Reconstructed ancestral enzymes suggest long-term cooling of Earth's photic zone since the Archean.

Garcia AK, Schopf JW, Yokobori SI, Akanuma S, Yamagishi A.

Proc Natl Acad Sci U S A. 2017 May 2;114(18):4619-4624. doi: 10.1073/pnas.1702729114. Epub 2017 Apr 17.

3.

Reply to Dvořák et al.: Apparent evolutionary stasis of ancient subseafloor sulfur cycling biocoenoses.

Schopf JW, Kudryavtsev AB, Walter MR, Van Kranendonk MJ, Williford KH, Kozdon R, Valley JW, Gallardo VA, Espinoza C, Flannery DT.

Proc Natl Acad Sci U S A. 2015 May 19;112(20):E2560. doi: 10.1073/pnas.1503754112. Epub 2015 Apr 20. No abstract available.

4.

Sulfur-cycling fossil bacteria from the 1.8-Ga Duck Creek Formation provide promising evidence of evolution's null hypothesis.

Schopf JW, Kudryavtsev AB, Walter MR, Van Kranendonk MJ, Williford KH, Kozdon R, Valley JW, Gallardo VA, Espinoza C, Flannery DT.

Proc Natl Acad Sci U S A. 2015 Feb 17;112(7):2087-92. doi: 10.1073/pnas.1419241112. Epub 2015 Feb 2.

5.

Evidence of compositional and ultrastructural shifts during the development of calcareous tubes in the biofouling tubeworm, Hydroides elegans.

Chan VB, Vinn O, Li C, Lu X, Kudryavtsev AB, Schopf JW, Shih K, Zhang T, Thiyagarajan V.

J Struct Biol. 2015 Mar;189(3):230-7. doi: 10.1016/j.jsb.2015.01.004. Epub 2015 Jan 16.

PMID:
25600412
6.

Where do we go from here? Astrobiology editorial board opinions.

Cady LP, Brack A, Bueno Prieto JE, Cockell C, Horneck G, Kasting JF, Lineweaver CH, Raulin F, Schopf JW, Sleep N, von Bloh W, Westall F, Deamer D, Lehman N, Pérez-Mercader J.

Astrobiology. 2014 Aug;14(8):629-44. doi: 10.1089/ast.2014.1405. No abstract available.

PMID:
25102138
7.

Geological evidence of oxygenic photosynthesis and the biotic response to the 2400-2200 ma "great oxidation event".

Schopf JW.

Biochemistry (Mosc). 2014 Mar;79(3):165-77. doi: 10.1134/S0006297914030018. Review.

8.

Characterization of the stem anatomy of the Eocene fern Dennstaedtiopsis aerenchymata (Dennstaedtiaceae) by use of confocal laser scanning microscopy.

Shi CS, Schopf JW, Kudryavtsev AB.

Am J Bot. 2013 Aug;100(8):1626-40. doi: 10.3732/ajb.1300027. Epub 2013 Aug 7.

9.

Genome of the long-living sacred lotus (Nelumbo nucifera Gaertn.).

Ming R, VanBuren R, Liu Y, Yang M, Han Y, Li LT, Zhang Q, Kim MJ, Schatz MC, Campbell M, Li J, Bowers JE, Tang H, Lyons E, Ferguson AA, Narzisi G, Nelson DR, Blaby-Haas CE, Gschwend AR, Jiao Y, Der JP, Zeng F, Han J, Min XJ, Hudson KA, Singh R, Grennan AK, Karpowicz SJ, Watling JR, Ito K, Robinson SA, Hudson ME, Yu Q, Mockler TC, Carroll A, Zheng Y, Sunkar R, Jia R, Chen N, Arro J, Wai CM, Wafula E, Spence A, Han Y, Xu L, Zhang J, Peery R, Haus MJ, Xiong W, Walsh JA, Wu J, Wang ML, Zhu YJ, Paull RE, Britt AB, Du C, Downie SR, Schuler MA, Michael TP, Long SP, Ort DR, Schopf JW, Gang DR, Jiang N, Yandell M, dePamphilis CW, Merchant SS, Paterson AH, Buchanan BB, Li S, Shen-Miller J.

Genome Biol. 2013 May 10;14(5):R41. doi: 10.1186/gb-2013-14-5-r41.

10.

Gypsum-permineralized microfossils and their relevance to the search for life on Mars.

Schopf JW, Farmer JD, Foster IS, Kudryavtsev AB, Gallardo VA, Espinoza C.

Astrobiology. 2012 Jul;12(7):619-33. doi: 10.1089/ast.2012.0827. Epub 2012 Jul 13.

PMID:
22794252
11.

Pioneers of astrobiology. J. William Schopf.

Schopf JW.

Astrobiology. 2011 Jan-Feb;11(1):9-14. doi: 10.1089/ast.2010.1129. Epub 2011 Feb 6. No abstract available.

PMID:
21294675
12.

Raman spectroscopic study of the mineral composition of cirratulid tubes (Annelida, Polychaeta).

Taylor PD, Vinn O, Kudryavtsev A, Schopf JW.

J Struct Biol. 2010 Sep;171(3):402-5. doi: 10.1016/j.jsb.2010.05.010. Epub 2010 May 23.

PMID:
20566380
13.
14.

Raman spectra of a Lower Cambrian ctenophore embryo from southwestern Shaanxi, China.

Chen JY, Schopf JW, Bottjer DJ, Zhang CY, Kudryavtsev AB, Tripathi AB, Wang XQ, Yang YH, Gao X, Yang Y.

Proc Natl Acad Sci U S A. 2007 Apr 10;104(15):6289-92. Epub 2007 Apr 2.

15.

Fossil evidence of Archaean life.

Schopf JW.

Philos Trans R Soc Lond B Biol Sci. 2006 Jun 29;361(1470):869-85. Review.

16.
17.

Three-dimensional confocal optical imagery of precambrian microscopic organisms.

Schopf JW, Tripathi AB, Kudryavtsev AB.

Astrobiology. 2006 Feb;6(1):1-16.

PMID:
16551223
18.

Raman imagery: a new approach to assess the geochemical maturity and biogenicity of permineralized precambrian fossils.

Schopf JW, Kudryavtsev AB, Agresti DG, Czaja AD, Wdowiak TJ.

Astrobiology. 2005 Jun;5(3):333-71.

PMID:
15941380
19.

Morphological biosignatures and the search for life on Mars.

Cady SL, Farmer JD, Grotzinger JP, Schopf JW, Steele A.

Astrobiology. 2003 Summer;3(2):351-68.

PMID:
14577884
20.

Atomic force microscopy of Precambrian microscopic fossils.

Kempe A, Schopf JW, Altermann W, Kudryavtsev AB, Heckl WM.

Proc Natl Acad Sci U S A. 2002 Jul 9;99(14):9117-20. Epub 2002 Jun 27. Erratum in: Proc Natl Acad Sci U S A. 2004 Jun 8;101(23):8838.

21.

Laser--Raman imagery of Earth's earliest fossils.

Schopf JW, Kudryavtsev AB, Agresti DG, Wdowiak TJ, Czaja AD.

Nature. 2002 Mar 7;416(6876):73-6.

PMID:
11882894
22.

Long-living lotus: germination and soil {gamma}-irradiation of centuries-old fruits, and cultivation, growth, and phenotypic abnormalities of offspring.

Shen-Miller J, Schopf JW, Harbottle G, Cao RJ, Ouyang S, Zhou KS, Southon JR, Liu GH.

Am J Bot. 2002 Feb;89(2):236-47. doi: 10.3732/ajb.89.2.236.

23.

Carbon isotopic composition of individual Precambrian microfossils.

House CH, Schopf JW, McKeegan KD, Coath CD, Harrison TM, Stetter KO.

Geology. 2000 Aug;28(8):707-10.

PMID:
11543502
24.

Deep divisions in the Tree of Life--what does the fossil record reveal?

Schopf JW.

Biol Bull. 1999 Jun;196(3):351-3; discussion 354-5. No abstract available.

PMID:
11536910
25.

In situ laser-Raman imagery of precambrian microscopic fossils.

Kudryavtsev AB, Schopf JW, Agresti DG, Wdowiak TJ.

Proc Natl Acad Sci U S A. 2001 Jan 30;98(3):823-6.

26.

Solution to Darwin's dilemma: discovery of the missing Precambrian record of life.

Schopf JW.

Proc Natl Acad Sci U S A. 2000 Jun 20;97(13):6947-53. Review.

27.

Response

Miller SL, Schopf JW, Lazcano A.

J Mol Evol. 1997 Oct;45(4):340-1. No abstract available.

PMID:
9321412
28.

Oparin's "Origin of Life": sixty years later.

Miller SL, Schopf JW, Lazcano A.

J Mol Evol. 1997 Apr;44(4):351-3. No abstract available.

PMID:
9089073
30.

The early evolution of life: solution to Darwin's dilemma.

Schopf JW.

Trends Ecol Evol. 1994 Oct;9(10):375-7.

PMID:
11539583
31.
32.
33.

Collapse of the Late Proterozoic ecosystem.

Schopf JW.

South Afr J Geol. 1991;94(1):33-43.

PMID:
11538702
34.
35.
36.

Proterozoic stromatolitic microbiotas of the 1400-1500 Ma-old Gaoyuzhuang formation near Jixian, northern China.

Schopf JW, Wei-Qing Z, Zhao-Liang X, Jen H.

Precambrian Res. 1984;24:335-49.

PMID:
11541987
37.

The evolution of the earliest cells.

Schopf JW.

Sci Am. 1978 Sep;239(3):110-2, 114, 116-20 passim. No abstract available.

PMID:
705320
38.

Chitinozoans from the late precambrian chuar group of the grand canyon, Arizona.

Bloeser B, Schopf JW, Horodyski RJ, Breed WJ.

Science. 1977 Feb 18;195(4279):676-9.

PMID:
17816417
39.
40.

How old are the eukaryotes?

Schopf JW, Oehler DZ.

Science. 1976 Jul 2;193(4247):47-9.

PMID:
17794005
41.

Are the oldest 'fossils', fossils?

Schopf JW.

Orig Life. 1976 Jan;7(1):19-36.

PMID:
967401
42.

The development and diversification of Precambrian life.

Schopf JW.

Orig Life. 1974 Jan-Apr;5(1):119-35. No abstract available.

PMID:
4210319
43.

Microorganisms from the late precambrian of the grand canyon, Arizona.

Schopf JW, Ford TD, Breed WJ.

Science. 1973 Mar 30;179(4080):1319-21.

PMID:
17835936
44.

Carbon isotopic studies of organic matter in precambrian rocks.

Oehler DZ, Schopf JW, Kvenvolden KA.

Science. 1972 Mar 17;175(4027):1246-8.

PMID:
17794201
45.

Artificial microfossils: experimental studies of permineralization of blue-green algae in silica.

Oehler JH, Schopf JW.

Science. 1971 Dec 17;174(4015):1229-31.

PMID:
17806931
46.

Micropaleontological studies of lunar samples.

Schopf JW.

Science. 1970 Jan 30;167(3918):779-80.

PMID:
17781588
47.

Search for organic compounds in the lunar dust from the sea of tranquiblity.

Ponnamperuma C, Kvenvolden K, Chang S, Johnson R, Pollock G, Philpott D, Kaplan I, Smith J, Schopf JW, Gehrke C, Hodgson G, Breger IA, Halpern B, Duffield A, Krauskopf K, Barghoorn E, Holland H, Keil K.

Science. 1970 Jan 30;167(3918):760-2.

PMID:
17781583
48.

Amino acids in Precambrian sediments: an assay.

Schopf JW, Kvenvolden KA, Barghoorn ES.

Proc Natl Acad Sci U S A. 1968 Feb;59(2):639-46. No abstract available.

49.

Alga-like fossils from the early precambrian of South Africa.

Schopf JW, Barghoorn ES.

Science. 1967 Apr 28;156(3774):508-12.

PMID:
17730741
50.

Microorganisms three billion years old from the precambrian of South Africa.

Barghoorn ES, Schopf JW.

Science. 1966 May 6;152(3723):758-63.

PMID:
17797444

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