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  • Animals  (1)
  • GEOPHYSICS
  • Humans
  • Isoptera
  • Mesoderm/cytology/*physiology
  • Models, Genetic
  • 2000-2004  (1)
  • 1990-1994  (1)
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  • 1
    Publication Date: 2002-03-02
    Description: Development of the body plan is controlled by large networks of regulatory genes. A gene regulatory network that controls the specification of endoderm and mesoderm in the sea urchin embryo is summarized here. The network was derived from large-scale perturbation analyses, in combination with computational methodologies, genomic data, cis-regulatory analysis, and molecular embryology. The network contains over 40 genes at present, and each node can be directly verified at the DNA sequence level by cis-regulatory analysis. Its architecture reveals specific and general aspects of development, such as how given cells generate their ordained fates in the embryo and why the process moves inexorably forward in developmental time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davidson, Eric H -- Rast, Jonathan P -- Oliveri, Paola -- Ransick, Andrew -- Calestani, Cristina -- Yuh, Chiou-Hwa -- Minokawa, Takuya -- Amore, Gabriele -- Hinman, Veronica -- Arenas-Mena, Cesar -- Otim, Ochan -- Brown, C Titus -- Livi, Carolina B -- Lee, Pei Yun -- Revilla, Roger -- Rust, Alistair G -- Pan, Zheng jun -- Schilstra, Maria J -- Clarke, Peter J C -- Arnone, Maria I -- Rowen, Lee -- Cameron, R Andrew -- McClay, David R -- Hood, Leroy -- Bolouri, Hamid -- GM-61005/GM/NIGMS NIH HHS/ -- HD-37105/HD/NICHD NIH HHS/ -- RR-06591/RR/NCRR NIH HHS/ -- RR-15044/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 1;295(5560):1669-78.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA. davidson@caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11872831" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Lineage ; Computational Biology ; Embryonic Development ; Endoderm/cytology/*physiology ; Gene Expression Profiling ; *Gene Expression Regulation, Developmental ; Genes, Regulator ; *Genome ; Mesoderm/cytology/*physiology ; Models, Biological ; Models, Genetic ; Morphogenesis ; Regulatory Sequences, Nucleic Acid ; Sea Urchins/*embryology/*genetics ; Stem Cells/physiology ; Systems Theory
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2019-07-13
    Description: Sea level changes are related to both climatic variations and tectonic movements. The fractal dimensions of several sea level curves were compared to a modern climatic fractal dimension of 1.26 established for annual precipitation records. A similar fractal dimension (1.22) based on delta(O-18/O-16) in deep-sea sediments has been suggested to characterize climatic change during the past 2 m.y. Our analysis indicates that sea level changes over the past 150,000 to 250,000 years also exhibit comparable fractal dimensions. Sea level changes for periods longer than about 30 m.y. are found to produce fractal dimensions closer to unity and Missourian (Late Pennsylvanian) sea level changes yield a fractal dimension of 1.41. The fact that these sea level curves all possess fractal dimensions less than 1.5 indicates that sea level changes exhibit nonperiodic, long-run persistence. The different fractal dimensions calculated for the various time periods could be the result of a characteristic overprinting of the sediment recored by prevailing processes during deposition. For example, during the Quaternary, glacio-eustatic sea level changes correlate well with the present climatic signature. During the Missourian, however, mechanisms such as plate reorganization may have dominated, resulting in a significantly different fractal dimension.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; B12; p. 21963-21967
    Format: text
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