Las publicaciones científicas no deberían estar al servicio de la comunidad científica librementes?

bannerg16

ciencia

He encontrado la publicación en la que se basa mi artículo anterior sobre el desarrollo primario de la evolución en lagos. Es práctica usual en mi blog, citar y reproducir los materiales originales en la medida en que me sea posible. Muchos jornales científicos no permiten el libre uso de publicaciones pese a que muchos de estos estudios son financiados por el dinero del contribuyente de un modo u otro . Solo les puedo presentar al abstracto de este valioso artículo. Para obtener la publicación completa tendría que pagar como pagaría por un par de zapatos. Lamentable escenario donde valiosos documentos científicos son reducidos a mercancia. Creo firmemente que la información científica debe ser libre de acceder por nuestra comunidad. Por eso soporto los PLoS , su filosofía y metas. Creo que eventualmente prevalecerá la visión de los PLoS.

Si desea obtener la publicación puede ir a:

http://www.pnas.org/content/early/2009/07/28/0901080106.full.pdf+html

Mineralogical constraints on the paleoenvironments of the Ediacaran Doushantuo Formation
Thomas F. Bristowa,1, Martin J. Kennedya, Arkadiusz Derkowskia, Mary L. Drosera, Ganqing Jiangb and Robert A. Creaserc

Abstract :Assemblages of clay minerals are routinely used as proxies for paleoclimatic change and paleoenvironmental conditions in Phanerozoic rocks. However, this tool is rarely applied in older sedimentary units. In this paper, the clay mineralogy of the Doushantuo Formation in South China is documented, providing constraints on depositional conditions of the Ediacaran Yangtze platform that host the earliest animal fossils in the geological record. In multiple sections from the Yangtze Gorges area, trioctahedral smectite (saponite) and its diagenetic products (mixed-layer chlorite/smectite, corrensite, and chlorite) are the dominant clays through the lower 80 m of the formation and constitute up to 30 wt% of the bulk rock. Saponite is interpreted as an in situ early diagenetic phase that formed in alkaline conditions (pH ≥ 9). The absence of saponite in stratigraphically equivalent basin sections, 200–400 km to the south, indicates that alkaline conditions were localized in a nonmarine basin near the Yangtze Gorges region. This interpretation is consistent with crustal abundances of redox-sensitive trace elements in saponitic mudstones deposited under anoxic conditions, as well as a 10‰ difference in the carbon isotope record between Yangtze Gorges and basin sections. Our findings suggest that nonmarine environments may have been hospitable for the fauna preserved in the Yangtze Gorges, which includes the oldest examples of animal embryo fossils and acanthomorphic acritarchs.

clayssaponiteNeoproterozoicnonmarineearly animals
Footnotes
1To whom correspondence should be sent at the present address: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125. E-mail: tbristow@caltech.eduAuthor contributions: T.F.B. and M.J.K. designed research; T.F.B., A.D., G.J., and R.A.C. performed research; M.J.K. and R.A.C. contributed new reagents/analytic tools; T.F.B., M.J.K., A.D., and M.L.D. analyzed data; and T.F.B. wrote the paper.
Edited by L. Paul Knauth, Arizona State University, Tempe, AZ, and accepted by the Editorial Board June 22, 2009
The authors declare no conflict of interest.

One Response to Las publicaciones científicas no deberían estar al servicio de la comunidad científica librementes?

  1. Janet says:

    La evolucion y desarrollo de los lagos han sido los pilares sobre los cuales se ha investigado en forma concreta y particular el estudio de muchos cientificos. No hay duda que la persona que escribio este articulo haya dejado la estela maravillosa de su singular genio. Janet S.

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