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Ediacaran) of Earth – Nature’S Experiments
The Early Animals (Ediacaran) of Earth – Nature’s Experiments Donald Baumgartner Medical Entomologist, Biologist, and Fossil Enthusiast Presentation before Chicago Rocks and Mineral Society May 10, 2014 Illinois Famous for Pennsylvanian Fossils 3 In the Beginning: The Big Bang . Earth formed 4.6 billion years ago Fossil Record Order 95% of higher taxa: Random plant divisions domains & kingdoms Cambrian Atdabanian Fauna Vendian Tommotian Fauna Ediacaran Fauna protists Proterozoic algae McConnell (Baptist)College Pre C - Fossil Order Archaean bacteria Source: Truett Kurt Wise The First Cells . 3.8 billion years ago, oxygen levels in atmosphere and seas were low • Early prokaryotic cells probably were anaerobic • Stromatolites . Divergence separated bacteria from ancestors of archaeans and eukaryotes Stromatolites Dominated the Earth Stromatolites of cyanobacteria ruled the Earth from 3.8 b.y. to 600 m. [2.5 b.y.]. Believed that Earth glaciations are correlated with great demise of stromatolites world-wide. 8 The Oxygen Atmosphere . Cyanobacteria evolved an oxygen-releasing, noncyclic pathway of photosynthesis • Changed Earth’s atmosphere . Increased oxygen favored aerobic respiration Early Multi-Cellular Life Was Born Eosphaera & Kakabekia at 2 b.y in Canada Gunflint Chert 11 Earliest Multi-Cellular Metazoan Life (1) Alga Eukaryote Grypania of MI at 1.85 b.y. MI fossil outcrop 12 Earliest Multi-Cellular Metazoan Life (2) Beads Horodyskia of MT and Aust. at 1.5 b.y. thought to be algae 13 Source: Fedonkin et al. 2007 Rise of Animals Tappania Fungus at 1.5 b.y Described now from China, Russia, Canada, India, & Australia 14 Earliest Multi-Cellular Metazoan Animals (3) Worm-like Parmia of N.E. -
Spirin a S. Spektrofotometrichesloe Opredelenie Summarnogo Kolichestva
CC/NUMBER 21 This Week’s Citation Classic MAY26,1986 ~ Spirin A S. Spektrofotometrichesloe opredelenie summarnogo kolichestva . nukleinovykh kislot (Spectrophotometric determination of total nucleic acids). Biokhimiya (USSR) 23:656-62. 1958. (A.N. Bakh Institute of Biochemistry, Academy of Sciences of the USSR, Moscow, USSR] The paper describes a simple universal cient of molar extinction ~270= 10,000 in method of determining nucleic acids in bio- hot HCIO extracts of nucleic acids re- logical materials based on the measurement gardless of4 the type (DNA or RNA) and of the difference in optical densities of the base composition of the nucleic acids hot HCIO extract at two wavelengths, 270 under investigation. m~iand 2904 mp. [The SCI® indicates that this Subsequently, a modification had to paper has been cited in over 760 publica- be made to reduce the effect of extract- tions.] ed ultraviolet-absorbing materials of a nonnucleic acid nature; instead of a di- rect measurement of optical density at 270 m~i,I suggested using the difference of optical densities at two close wave- lengths, 270 m~and 290 m~(the differ- ence in optical densities at 270 m~and Alexander Spirin 290 m~idivided by 0.19 gives the number Institute of Protein Research of nucleic acid phosphorus micrograms Academy of Sciences of the USSR per milliliter). The method proved to be 142292 Pushchino, Moscow Region very convenient and yielded precise re- USSR sults at testing on a large number of ob- jects of animal and plant origin. (Howev- er, when applied to bacteria, the meth- od in this differential variant gave some February 20, 1986 under- or overestimation in the cases of extreme GC or AT types of their DNA, respectively.) Under strong pressure from my col- In 1955.1957 I was a postgraduate stu- leagues, I sent a two-page typewritten dent in A.N. -
The Great Oxidation Event: an Expert Discussion on the Causes, the Processes, and the Still Unknowns
ASTROBIOLOGY Volume 12, Number 12, 2012 The Astrobiology Society Roundtable ª Mary Ann Liebert, Inc. DOI: 10.1089/ast.2012.1110 The Great Oxidation Event: An Expert Discussion on the Causes, the Processes, and the Still Unknowns Moderator: Frances Westall1 Participants: Ariel Anbar,2 Woody Fischer,3 and Lee Kump4 Dr. Frances Westall (FW): Let’s begin with each of you seeming to get honed in on the Archean-Proterozoic tran- giving an overview as to the importance of biogenic pro- sition, I have always looked for a change in the solid cesses in the rise of oxygen—oxygenic photosynthesis. Lee, Earth dynamics that is linked to that, because the Archean- would you like to begin? Proterozoic boundary was defined based on geological evi- Dr. Lee Kump (LK): What is really interesting about the dence for the stabilization of continental cratons. history of atmospheric oxygenation is that there is this event That is what ultimately led Mark Barley and me to look at or interval of change from an anoxic Archean atmosphere to that issue of changes in style of tectonics at the Archean- an oxygenated post-Archean atmosphere (Holland, 1994). Proterozoic boundary, and ultimately focus on the style of When we think about the causes of the rise of oxygen and we volcanism (Kump and Barley, 2007). This was, again, the think about the Great Oxidation Event, it is really a funda- result of Holland pointing out that in modern volcanic sys- mental change in the way the Earth system functioned. It is a tems, the oxygen demand from the release of fluids, gases of new state; it is the oxygenated state that is distinct from the subaerial volcanoes was significantly less than that from the anoxic state, and it is nonreversible. -
Towards the Construction of Escherichia Coli Cell-Free Protein Synthesis System Platform
Towards the construction of Escherichia coli cell-free protein synthesis system platform Sara Alexandra Peça de Sousa Rosa Thesis to obtain the Master of Science Degree in Biotechnology Supervisor(s): Professor Luís Joaquim Pina da Fonseca Examination Committee Chairperson: Professor Arsénio do Carmo Sales Mendes Fialho Supervisor: Professor Luís Joaquim Pina da Fonseca Member of the Committee: Professor Gabriel António Amaro Monteiro July 2015 ii Acknowledgments I would like to express my gratitude to professor Lu´ıs Fonseca, for giving me the opportunity to work in a subject that I fell in love with. I would like to thank to all my colleges of 7th and 8th floor, for all the help, advice, and support. Without all of you I would not be able to finish my work. I would also like to thank to Doctor Ana Azevedo and Sofia Duarte, for all the help and tips. I would like to give a special thanks to Ana, Andreia, Catia,´ Elsa, Pedro, Rita and Ricardo, for help and support during the best and worst times. I also want to thank to Claudia,´ for the time spent inside IST walls. Most of all, I would like to thank my mom and dad for all the support. I also want to thank to my grandmother, for all the concern, and to my nieces, Beatriz and Margarida. Finally, I want to thank Davide, for always being there. My words will be never enough to express my gratitude towards you. Thank you all. iii iv Resumo Sistemas produtores de prote´ınas livres de celulas´ sao˜ descritos como a expressao˜ in vitro de prote´ınas recombinantes sem o recurso a celulas´ vivas. -
1992 Doug Murphy in 1978, Doug Murphy's Lab at the Johns
1992 Doug Murphy In 1978, Doug Murphy's lab at the Johns Hopkins Department of Cell Biology and Anatomy invited a Russian postdoc from Alexander Spirin's group to join them. The 1979 invasion of Afghanistan and the 1980 boycott of the Olympics, however, heightened the Cold War and prevented the exchange. Since Russians could not leave the Soviet Union, the only alternative for scientific exchange was for US scientists to go to the USSR. Armed with a deep interest in foreign languages—he speaks three, including Russian—Murphy felt this was a good time to extend his life beyond the bench and do something on a human scale, so he went to Russia himself. Under the auspices of the National Academy of Sciences, he spent one month in the USSR. Amid bugged rooms and tight security, Murphy discovered that the official animosity toward US scientists was not shared by Soviet scientists. The Russian scientists were starved for US scientific news. Generally six months behind in scientific developments, nothing was trivial to them. "They wanted to know everything," says Murphy, "how the cultures differed, what the everyday life of a scientist was like— everything." Although life in Russia is far different from life in the US, Murphy discovered that Americans can easily identify with Russians because both are "warm and generous." That first visit led to six more visits in the following years, including one in 1985 where Murphy gave a lecture series entitled "The Molecular Biology of the Cytoskeleton". With the beginning of glasnost, more Russian scientists were allowed to leave the USSR. -
Contributions to the Neoproterozoic Geobiology
Contributions to the Neoproterozoic Geobiology Bing Shen Dissertation submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy In Department of Geosciences Shuhai Xiao (Chair) Robert Bodnar Michal Kowalewski J. Fred Read November 29, 2007 Blacksburg, Virginia Key words: Neoproterozoic, Ediacaran, Ediacara fossils, China, Disparity, Sulfur isotope, Carbon isotope Copyright 2007, Bing Shen Contributions to the Neoproterozoic Geobiology Bing Shen Abstract This thesis makes several contributions to improve our understanding of the Neoproterozoic Paleobiology. In chapter 1, a comprehensive quantitative analysis of the Ediacara fossils indicates that the oldest Ediacara assemblage—the Avalon assemblage— already encompassed the full range of Ediacara morphospace. A comparable morphospace range was occupied by the subsequent White Sea and Nama assemblages, although it was populated differently. In contrast, taxonomic richness increased in the White Sea assemblage and declined in the Nama assemblage. The Avalon morphospace expansion mirrors the Cambrian explosion, and both may reflect similar underlying mechanisms. Chapter 2 describes problematic macrofossils collected from the Neoproterozoic slate of the upper Zhengmuguan Formation in North China and sandstone of the Zhoujieshan Formation in Chaidam. Some of these fossils were previously interpreted as animal traces. Our study of these fossils recognizes four genera and five species. None of these taxa can be interpreted as animal traces. Instead, they are problematic body fossils of unresolved phylogenetic affinities. Chapter 3 reports stable isotopes of the Zhamoketi cap dolostone atop the Tereeken diamictite in the Quruqtagh area, eastern Chinese Tianshan. Our new data indicate that carbonate associated sulfate (CAS) abundance decreases rapidly in the basal 34 cap dolostone and δ SCAS composition varies between +9‰ and +15‰ in the lower 2.5 34 m. -
Emanuele Serrelli Nathalie Gontier Editors Explanation, Interpretation
Interdisciplinary Evolution Research 2 Emanuele Serrelli Nathalie Gontier Editors Macroevolution Explanation, Interpretation and Evidence Interdisciplinary Evolution Research Volume 2 Series editors Nathalie Gontier, Lisbon, Portugal Olga Pombo, Lisbon, Portugal [email protected] About the Series The time when only biologists studied evolution has long since passed. Accepting evolution requires us to come to terms with the fact that everything that exists must be the outcome of evolutionary processes. Today, a wide variety of academic disciplines are therefore confronted with evolutionary problems, ranging from physics and medicine, to linguistics, anthropology and sociology. Solving evolutionary problems also necessitates an inter- and transdisciplinary approach, which is why the Modern Synthesis is currently extended to include drift theory, symbiogenesis, lateral gene transfer, hybridization, epigenetics and punctuated equilibria theory. The series Interdisciplinary Evolution Research aims to provide a scholarly platform for the growing demand to examine specific evolutionary problems from the perspectives of multiple disciplines. It does not adhere to one specific academic field, one specific school of thought, or one specific evolutionary theory. Rather, books in the series thematically analyze how a variety of evolutionary fields and evolutionary theories provide insights into specific, well-defined evolutionary problems of life and the socio-cultural domain. Editors-in-chief of the series are Nathalie Gontier and Olga Pombo. The -
Methanogenic Burst in the End-Permian Carbon Cycle
Methanogenic burst in the end-Permian carbon cycle Daniel H. Rothmana,b,1, Gregory P. Fournierc, Katherine L. Frenchb, Eric J. Almc, Edward A. Boyleb, Changqun Caod, and Roger E. Summonsb aLorenz Center, bDepartment of Earth, Atmospheric, and Planetary Sciences, and cDepartment of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139; and dState Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China Edited by John M. Hayes, Woods Hole Oceanographic Institution, Woods Hole, MA, and approved February 4, 2014 (received for review September 27, 2013) The end-Permian extinction is associated with a mysterious disrup- and its perturbation to the carbon cycle but also to amplify the tion to Earth’s carbon cycle. Here we identify causal mechanisms via development of marine anoxia. Taken as a whole, these results three observations. First, we show that geochemical signals indicate reconcile an array of apparently disparate observations about the superexponential growth of the marine inorganic carbon reservoir, end-Permian event. coincident with the extinction and consistent with the expansion of a new microbial metabolic pathway. Second, we show that the effi- Growth of the Marine Carbon Reservoir cient acetoclastic pathway in Methanosarcina emerged at a time sta- Fig. 1A displays the carbon-isotopic record in Meishan, China tistically indistinguishable from the extinction. Finally, we show that (5). Immediately preceding the extinction event, the isotopic com- nickel concentrations in South China sediments increased sharply at position δ1 of carbonate carbon declines by about 7‰ during the extinction, probably as a consequence of massive Siberian volca- a period of about 100 thousand years (Kyr), first slowly, and sub- nism, enabling a methanogenic expansion by removal of nickel lim- sequently rapidly. -
Mcmenamin FM
The Garden of Ediacara • Frontispiece: The Nama Group, Aus, Namibia, August 9, 1993. From left to right, A. Seilacher, E. Seilacher, P. Seilacher, M. McMenamin, H. Luginsland, and F. Pflüger. Photograph by C. K. Brain. The Garden of Ediacara • Discovering the First Complex Life Mark A. S. McMenamin C Columbia University Press New York C Columbia University Press Publishers Since 1893 New York Chichester, West Sussex Copyright © 1998 Columbia University Press All rights reserved Library of Congress Cataloging-in-Publication Data McMenamin, Mark A. The garden of Ediacara : discovering the first complex life / Mark A. S. McMenamin. p. cm. Includes bibliographical references and index. ISBN 0-231-10558-4 (cloth) — ISBN 0–231–10559–2 (pbk.) 1. Paleontology—Precambrian. 2. Fossils. I. Title. QE724.M364 1998 560'.171—dc21 97-38073 Casebound editions of Columbia University Press books are printed on permanent and durable acid-free paper. Printed in the United States of America c 10 9 8 7 6 5 4 3 2 1 p 10 9 8 7 6 5 4 3 2 1 For Gene Foley Desert Rat par excellence and to the memory of Professor Gonzalo Vidal This page intentionally left blank Contents Foreword • ix Preface • xiii Acknowledgments • xv 1. Mystery Fossil 1 2. The Sand Menagerie 11 3. Vermiforma 47 4. The Nama Group 61 5. Back to the Garden 121 6. Cloudina 157 7. Ophrydium 167 8. Reunite Rodinia! 173 9. The Mexican Find: Sonora 1995 189 10. The Lost World 213 11. A Family Tree 225 12. Awareness of Ediacara 239 13. Revenge of the Mole Rats 255 Epilogue: Parallel Evolution • 279 Appendix • 283 Index • 285 This page intentionally left blank Foreword Dorion Sagan Virtually as soon as earth’s crust cools enough to be hospitable to life, we find evidence of life on its surface. -
Persistent Global Marine Euxinia in the Early Silurian ✉ Richard G
ARTICLE https://doi.org/10.1038/s41467-020-15400-y OPEN Persistent global marine euxinia in the early Silurian ✉ Richard G. Stockey 1 , Devon B. Cole 2, Noah J. Planavsky3, David K. Loydell 4,Jiří Frýda5 & Erik A. Sperling1 The second pulse of the Late Ordovician mass extinction occurred around the Hirnantian- Rhuddanian boundary (~444 Ma) and has been correlated with expanded marine anoxia lasting into the earliest Silurian. Characterization of the Hirnantian ocean anoxic event has focused on the onset of anoxia, with global reconstructions based on carbonate δ238U 1234567890():,; modeling. However, there have been limited attempts to quantify uncertainty in metal isotope mass balance approaches. Here, we probabilistically evaluate coupled metal isotopes and sedimentary archives to increase constraint. We present iron speciation, metal concentration, δ98Mo and δ238U measurements of Rhuddanian black shales from the Murzuq Basin, Libya. We evaluate these data (and published carbonate δ238U data) with a coupled stochastic mass balance model. Combined statistical analysis of metal isotopes and sedimentary sinks provides uncertainty-bounded constraints on the intensity of Hirnantian-Rhuddanian euxinia. This work extends the duration of anoxia to >3 Myrs – notably longer than well-studied Mesozoic ocean anoxic events. 1 Stanford University, Department of Geological Sciences, Stanford, CA 94305, USA. 2 School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA. 3 Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA. 4 School of the Environment, Geography and Geosciences, University of Portsmouth, Portsmouth PO1 3QL, UK. 5 Faculty of Environmental Sciences, Czech University of Life Sciences ✉ Prague, Prague, Czech Republic. -
Back Matter (PDF)
Index Acraman impact ejecta layer 53–4, 117, 123, 126–9, Aspidella 130–2, 425–7 controversy 300, 301–3, 305 acritarchs ecology 303 Amadeus and Officer Basins 119 synonyms 302 biostratigraphy 115–25, 130–2 Australia Australian correlations 130–2 Acraman impact ejecta layer 53–4, 117, 123, 126–9, composite zonation scheme 119, 131, 132 130–2, 425–7 India 318–20 carbon isotope chemostratigraphy 126–9 Ireland 289 correlations of Ediacaran System and Period 18, Spain 232 115–35 sphaeromorphid 324 Marinoan glaciation 53–4, 126 Adelaide, Hallett Cove 68 Australia, Ediacaran System and Period Adelaide Rift Complex 115–22, 425 Bunyeroo–Wonoka Formation transition correlations with Officer Basin 127 137–9, 426 dating (Sr–Rb) 140 Centralian Superbasin 118, 125 generalized time–space diagram, correlations composite zonation scheme 131 between tectonic units 120 correlation methods and results 125–32 location maps 116, 118 time–space diagram 120 SE sector cumulative strata thickness 139 Vendian climatic indicators 17 stratigraphic correlation with Officer Basin 127 See also Adelaide Rift Complex; Flinders Ranges Stuart Shelf drill holes, correlations 117 Avalonian assemblages, Newfoundland 237–57, Sturtian (Umberatana) Group 116, 138 303–7, 427 Umberatana Group 116, 138 Africa backarc spreading, Altenfeld Formation 44–5, 47–8 Vendian climatic indicators 17 Baliana–Krol Group, NW Himalaya 319 see also Namibia Barut Formation, Iran 434 Aldanellidae 418 Bayesian analysis algal metaphyta, White Sea Region 271–4 eumetazoans 357–9 algal microfossils, White -
Reticulate Evolution Everywhere
Reticulate Evolution Everywhere Nathalie Gontier Abstract Reticulation is a recurring evolutionary pattern found in phylogenetic reconstructions of life. The pattern results from how species interact and evolve by mechanisms and processes including symbiosis; symbiogenesis; lateral gene transfer (that occurs via bacterial conjugation, transformation, transduction, Gene Transfer Agents, or the movements of transposons, retrotransposons, and other mobile genetic elements); hybridization or divergence with gene flow; and infec- tious heredity (induced either directly by bacteria, bacteriophages, viruses, pri- ons, protozoa and fungi, or via vectors that transmit these pathogens). Research on reticulate evolution today takes on inter- and transdisciplinary proportions and is able to unite distinct research fields ranging from microbiology and molecular genetics to evolutionary biology and the biomedical sciences. This chapter sum- marizes the main principles of the diverse reticulate evolutionary mechanisms and situates them into the chapters that make up this volume. Keywords Reticulate evolution · Symbiosis · Symbiogenesis · Lateral Gene Transfer · Infectious agents · Microbiome · Viriome · Virolution · Hybridization · Divergence with gene flow · Evolutionary patterns · Extended Synthesis 1 Reticulate Evolution: Patterns, Processes, Mechanisms According to the Online Etymology Dictionary (http://www.etymonline.com), the word reticulate is an adjective that stems from the Latin words “re¯ticulātus” (having a net-like pattern) and re¯ticulum (little net). When scholars identify the evolution of life as being “reticulated,” they first and foremost refer to a recurring evolutionary pattern. N. Gontier (*) AppEEL—Applied Evolutionary Epistemology Lab, University of Lisbon, Lisbon, Portugal e-mail: [email protected] © Springer International Publishing Switzerland 2015 1 N. Gontier (ed.), Reticulate Evolution, Interdisciplinary Evolution Research 3, DOI 10.1007/978-3-319-16345-1_1 2 N.