O Big Bang dos dinossauros: como se tivessem sido plantados lá???

quarta-feira, abril 18, 2018

Dinosaur diversification linked with the Carnian Pluvial Episode

Massimo Bernardi, Piero Gianolla, Fabio Massimo Petti, Paolo Mietto & Michael J. Benton

Nature Communications volume 9, Article number: 1499 (2018)

Download Citation

Palaeoecology Palaeontology

Received: 08 November 2017 Accepted: 27 March 2018

Published online: 16 April 2018


Dinosaurs diversified in two steps during the Triassic. They originated about 245 Ma, during the recovery from the Permian-Triassic mass extinction, and then remained insignificant until they exploded in diversity and ecological importance during the Late Triassic. Hitherto, this Late Triassic explosion was poorly constrained and poorly dated. Here we provide evidence that it followed the Carnian Pluvial Episode (CPE), dated to 234–232 Ma, a time when climates switched from arid to humid and back to arid again. Our evidence comes from a combined analysis of skeletal evidence and footprint occurrences, and especially from the exquisitely dated ichnofaunas of the Italian Dolomites. These provide evidence of tetrapod faunal compositions through the Carnian and Norian, and show that dinosaur footprints appear exactly at the time of the CPE. We argue then that dinosaurs diversified explosively in the mid Carnian, at a time of major climate and floral change and the extinction of key herbivores, which the dinosaurs opportunistically replaced.


Matthias Franz, (Göttingen University) Edgar Nitsch (LGRB Freiburg) and Manfred Menning (GFZ Postdam) are thanked for useful information of the Germanic Basin; Nereo Preto, Manuel Rigo (Padova University) and Jacopo Dal Corso (Leeds University) are thanked for fruitful discussions on the CPE; and Guido Roghi (CNR-IRPI) for useful comments on pollen association. Hendrik Klein (SPM Neumarkt) and Marco Avanzini (MUSE Trento) provided useful comments on the tetrapod ichno-associations. P.G. thanks Marcello Caggiati (Ferrara University) for the palaeogeographic map of the upper Carnian. M.B. thanks La Sportiva for supporting field activities in the Dolomites. Funded in part by the NERC BETR grant NE/P013724/1 to M.J.B. and by PRIN 2010-2011 (Pr. No 20107ESMX9_004) to P.G.

Author information

MUSE—Museo delle Scienze, Corso del Lavoro e della Scienza 3, 38122, Trento, Italy
Massimo Bernardi & Fabio Massimo Petti
School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK
Massimo Bernardi & Michael J. Benton
Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, via Saragat 1, 44100, Ferrara, Italy
Piero Gianolla
PaleoFactory, Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale Aldo Moro, 5, 00185, Rome, Italy
Fabio Massimo Petti
Dipartimento di Geoscienze, Università degli studi di Padova, via Gradenigo 6, I-35131, Padova, Italy
Paolo Mietto

M.B. and P.G. designed the study. M.B., F.M.P., and M.J.B. developed the palaeontological parts of the study, while P.G. and P.M. contributed in the more geological sections. All authors interpreted the results. M.B. and P.G. led the writing of the paper and all other co-authors contributed to the final version.

Competing interests
The authors declare no competing interests.

Corresponding author
Correspondence to Massimo Bernardi.



Novas formas "surgem abrupta e funcionalmente" no registro fóssil? De "não existem dinossauros" a "agora existem dinossauros"? E aí Darwin como é que fica o seu gradualismo???

Boodin 'falou e disse': fantasmas do passado induzem grandes cientistas ao erro

sexta-feira, abril 13, 2018

"Mesmo em tais áreas como a ciência, onde a razão é tida como estando mais em casa, há uma tendência para as teorias se tornarem dogmas. A hipótese de variações aleatórias e de seleção natural de Darwin tornaram-se não meramente um dogma de ciência, mas foi edificada numa filosofia do universo; e as limitações da hipótese e o espírito empírico de seu criador se perderam de vista numa tradição intolerante que tem tido sérias consequências, não somente para o desenvolvimento da ciência natural mas para a filosofia social. Em cada área da ciência nós somos atormentados por fantasmas do passado aos quais mentes inferiores prestam reverência supersticiosa e pelos quais até grandes mentes são induzidas ao erro de falsas premissas." 

"Even in such fields as science, where reason is supposed to be most at home, there is a tendency for theories to become dogmas. Darwin's hypothesis of chance variations and natural selection became not merely a dogma of science, but was erected into a philosophy of the universe; and the limitations of the hypothesis and the empirical spirit of its creator were lost sight of in an intolerant tradition which has had serious consequences, not only for the development of natural science but for social philosophy. In every field of science we are haunted by ghosts of the past to which lesser minds pay superstitious reverence and by which even great minds are misled into false assumptions." 

John Elof Boodin (1869-1950), The Social Mind, 1939

Mais ciência em ciência forense!

A call for more science in forensic science

Suzanne Bell, Sunita Sah, Thomas D. Albright, S. James Gates Jr., M. Bonner Denton and Arturo Casadevall

PNAS April 12, 2018. 201712161; published ahead of print April 12, 2018. https://doi.org/10.1073/pnas.1712161115

Edited by Solomon H. Snyder, The Johns Hopkins University School of Medicine, Baltimore, MD, and approved March 21, 2018 (received for review July 28, 2017)

Source/Fonte: SUNO - Southern University at New Orleans


Forensic science is critical to the administration of justice. The discipline of forensic science is remarkably complex and includes methodologies ranging from DNA analysis to chemical composition to pattern recognition. Many forensic practices developed under the auspices of law enforcement and were vetted primarily by the legal system rather than being subjected to scientific scrutiny and empirical testing. Beginning in the 1990s, exonerations based on DNA-related methods revealed problems with some forensic disciplines, leading to calls for major reforms. This process generated a National Academy of Science report in 2009 that was highly critical of many forensic practices and eventually led to the establishment of the National Commission for Forensic Science (NCFS) in 2013. The NCFS was a deliberative body that catalyzed communication between nonforensic scientists, forensic scientists, and other stakeholders in the legal community. In 2017, despite continuing problems with forensic science, the Department of Justice terminated the NCFS. Just when forensic science needs the most support, it is getting the least. We urge the larger scientific community to come to the aid of our forensic colleagues by advocating for urgently needed research, testing, and financial support.

forensic science justice DNA crime investigation


Celebrando 125 anos do The Physical Review

quinta-feira, abril 12, 2018

Celebrating 125 years of The Physical Review

The American Physical Society (APS) is proud to celebrate the 125th anniversary of the Physical Review journals. To commemorate this milestone, the editors present a timeline of select papers and events that are of significance to physics and to the history of the APS. From Robert Millikan’s famous oil drop experiments to the discovery of gravitational waves, the Physical Review journals have published a wide range of important results, many of which have been recognized with Nobel and other notable prizes. The papers in the timeline, along with landmark events in the history of the Physical Review, will be highlighted on our journal websites and in social media throughout 2018.

Visit/Visite: APS

Pesquisa de fóssil lança luz sobre as cores de asas de borboletas de 180 milhões de anos atrás

quarta-feira, abril 11, 2018

Fossil scales illuminate the early evolution of lepidopterans and structural colors

Qingqing Zhang1,2, Wolfram Mey3, Jörg Ansorge4, Timothy A. Starkey5, Luke T. McDonald6, Maria E. McNamara6, Edmund A. Jarzembowski1,7, Wilfried Wichard8, Richard Kelly9,10, Xiaoyin Ren1, Jun Chen1,11, Haichun Zhang1 and Bo Wang1,12,*

1State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China.

2University of Sciences and Technology of China, Hefei 230026, China.

3Museum für Naturkunde, Leibniz Institute of Evolution and Biodiversity Research, Humboldt University, D-10115 Berlin, Germany.

4Institute of Geography and Geology, University of Greifswald, D-17487 Greifswald, Germany.

5Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK.

6School of Biological, Earth and Environmental Sciences, University College Cork, North Mall, Cork T23 TK30, Ireland.

7Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK.

8Institute of Biology and its Didactics, University of Cologne, D-50931 Cologne, Germany.

9School of Earth Sciences, University of Bristol, Bristol BS8 1TQ, UK.

10Department of Natural Sciences, National Museum of Scotland, Edinburgh EH1 1JF, UK.

11Institute of Geology and Paleontology, Linyi University, Linyi 276000, China.

12Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

↵*Corresponding author. Email: bowang@nigpas.ac.cn

Science Advances 11 Apr 2018: Vol. 4, no. 4, e1700988

Source/FonteZhang Qingqing et al.


Lepidopteran scales exhibit remarkably complex ultrastructures, many of which produce structural colors that are the basis for diverse communication strategies. Little is known, however, about the early evolution of lepidopteran scales and their photonic structures. We report scale architectures from Jurassic Lepidoptera from the United Kingdom, Germany, Kazakhstan, and China and from Tarachoptera (a stem group of Amphiesmenoptera) from mid-Cretaceous Burmese amber. The Jurassic lepidopterans exhibit a type 1 bilayer scale vestiture: an upper layer of large fused cover scales and a lower layer of small fused ground scales. This scale arrangement, plus preserved herringbone ornamentation on the cover scale surface, is almost identical to those of some extant Micropterigidae. Critically, the fossil scale ultrastructures have periodicities measuring from 140 to 2000 nm and are therefore capable of scattering visible light, providing the earliest evidence of structural colors in the insect fossil record. Optical modeling confirms that diffraction-related scattering mechanisms dominate the photonic properties of the fossil cover scales, which would have displayed broadband metallic hues as in numerous extant Micropterigidae. The fossil tarachopteran scales exhibit a unique suite of characteristics, including small size, elongate-spatulate shape, ridged ornamentation, and irregular arrangement, providing novel insight into the early evolution of lepidopteran scales. Combined, our results provide the earliest evidence for structural coloration in fossil lepidopterans and support the hypothesis that fused wing scales and the type 1 bilayer covering are groundplan features of the group. Wing scales likely had deep origins in earlier amphiesmenopteran lineages before the appearance of the Lepidoptera.

Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

Lembra da Terra 2.0 (Kepler-452b)? Não pode ser confirmado!

Kepler's Earth-like Planets Should Not Be Confirmed Without Independent Detection: The Case of Kepler-452b

Fergal Mullally, Susan E. Thompson, Jeffery L. Coughlin, Christopher J. Burke, Jason F. Rowe

(Submitted on 30 Mar 2018)

Source/Fonte: Scientific American

We show that the claimed confirmed planet Kepler-452b (a.k.a. K07016.01, KIC 8311864) can not be confirmed using a purely statistical validation approach. Kepler detects many more periodic signals from instrumental effects than it does from transits, and it is likely impossible to confidently distinguish the two types of event at low signal-to-noise. As a result, the scenario that the observed signal is due to an instrumental artifact can't be ruled out with 99\% confidence, and the system must still be considered a candidate planet. We discuss the implications for other confirmed planets in or near the habitable zone.

Comments: Accepted for publication in AJ

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

Cite as: arXiv:1803.11307 [astro-ph.EP]

(or arXiv:1803.11307v1 [astro-ph.EP] for this version)

Submission history

From: Fergal Mullally [view email] 

[v1] Fri, 30 Mar 2018 01:37:23 GMT (326kb,D)


Outra hipótese para a química da origem da vida de superfície da Terra primitiva

terça-feira, abril 10, 2018

Sulfidic Anion Concentrations on Early Earth for Surficial Origins-of-Life Chemistry

Ranjan Sukrit , Todd Zoe R. , Sutherland John D. , and Sasselov Dimitar D.

Published Online:8 Apr 2018 https://doi.org/10.1089/ast.2017.1770

White Island, New Zealand. Researchers have found that a class of molecules called sulfidic anions may have been abundant in Earth’s lakes and rivers.
Credit: © Alba / Fotolia


A key challenge in origin-of-life studies is understanding the environmental conditions on early Earth under which abiogenesis occurred. While some constraints do exist (e.g., zircon evidence for surface liquid water), relatively few constraints exist on the abundances of trace chemical species, which are relevant to assessing the plausibility and guiding the development of postulated prebiotic chemical pathways which depend on these species. In this work, we combine literature photochemistry models with simple equilibrium chemistry calculations to place constraints on the plausible range of concentrations of sulfidic anions (HS−, HSO3−, SO32−) available in surficial aquatic reservoirs on early Earth due to outgassing of SO2 and H2S and their dissolution into small shallow surface water reservoirs like lakes. We find that this mechanism could have supplied prebiotically relevant levels of SO2-derived anions, but not H2S-derived anions. Radiative transfer modeling suggests UV light would have remained abundant on the planet surface for all but the largest volcanic explosions. We apply our results to the case study of the proposed prebiotic reaction network of Patel et al. (2015) and discuss the implications for improving its prebiotic plausibility. In general, epochs of moderately high volcanism could have been especially conducive to cyanosulfidic prebiotic chemistry. Our work can be similarly applied to assess and improve the prebiotic plausibility of other postulated surficial prebiotic chemistries that are sensitive to sulfidic anions, and our methods adapted to study other atmospherically derived trace species. 

Key Words: Early Earth—Origin of life—Prebiotic chemistry—Volcanism—UV radiation—Planetary environments. Astrobiology 18, xxx–xxx.

FREE PDF GRATIS: Astrobiology

Centenário do nascimento de Francis Crick

sexta-feira, abril 06, 2018

ISBN 978-3-03842-769-8 (Pbk) ISBN 978-3-03842-770-4 (PDF) 
DOI: 10.3390/books978-3-03842-770-4 Open Access 

© 2018 MDPI; under CC BY-NC-ND license

The Origin and Evolution of the Genetic Code: 100th Anniversary Year of the Birth of Francis Crick

Koji Tamura (Ed.)

Pages: X, 192

Published: March 2018

(This book is a printed edition of the Special Issue The Origin and Evolution of the Genetic Code: 100th Anniversary Year of the Birth of Francis Crick that was published in Life)


Adaptação ambiental desde a origem da vida até ao LUCA

Origins of Life and Evolution of Biospheres

March 2018, Volume 48, Issue 1, pp 35–54 | Cite as

Environmental Adaptation from the Origin of Life to the Last Universal Common Ancestor


Authors and affiliations

Marjorie D. Cantine1

Gregory P. Fournier1

Email author

View author's OrcID profile

1.Department of Earth, Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA


First Online: 06 July 2017


Extensive fundamental molecular and biological evolution took place between the prebiotic origins of life and the state of the Last Universal Common Ancestor (LUCA). Considering the evolutionary innovations between these two endpoints from the perspective of environmental adaptation, we explore the hypothesis that LUCA was temporally, spatially, and environmentally distinct from life’s earliest origins in an RNA world. Using this lens, we interpret several molecular biological features as indicating an environmental transition between a cold, radiation-shielded origin of life and a mesophilic, surface-dwelling LUCA. Cellularity provides motility and permits Darwinian evolution by connecting genetic material and its products, and thus establishing heredity and lineage. Considering the importance of compartmentalization and motility, we propose that the early emergence of cellularity is required for environmental dispersal and diversification during these transitions. Early diversification and the emergence of ecology before LUCA could be an important pre-adaptation for life’s persistence on a changing planet.


Origin of life Last universal common ancestor (LUCA) Environmental adaptation 

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O que é boa ciência? A tara por falsificação e observação está retardando o avanço da ciência. Será???

What is good science?

Demanding that a theory is falsifiable or observable, without any subtlety, will hold science back. We need madcap ideas

Uranus photographed by Voyager 2 in January 1986. Photo courtesy NASA

Adam Becker is a writer and astrophysicist. He is currently a visiting scholar at the Office for History of Science and Technology at the University of California, Berkeley. His writing has appeared in New Scientist and on the BBC, among others. He is the author of What is Real? The Unfinished Quest for the Meaning of Quantum Physics (2018). He lives in Oakland in California. 

The Viennese physicist Wolfgang Pauli suffered from a guilty conscience. He’d solved one of the knottiest puzzles in nuclear physics, but at a cost. ‘I have done a terrible thing,’ he admitted to a friend in the winter of 1930. ‘I have postulated a particle that cannot be detected.’

Despite his pantomime of despair, Pauli’s letters reveal that he didn’t really think his new sub-atomic particle would stay unseen. He trusted that experimental equipment would eventually be up to the task of proving him right or wrong, one way or another. Still, he worried he’d strayed too close to transgression. Things that were genuinely unobservable, Pauli believed, were anathema to physics and to science as a whole.

Pauli’s views persist among many scientists today. It’s a basic principle of scientific practice that a new theory shouldn’t invoke the undetectable. Rather, a good explanation should be falsifiable – which means it ought to rely on some hypothetical data that could, in principle, prove the theory wrong. These interlocking standards of falsifiability and observability have proud pedigrees: falsifiability goes back to the mid-20th-century philosopher of science Karl Popper, and observability goes further back than that. Today they’re patrolled by self-appointed guardians, who relish dismissing some of the more fanciful notions in physics, cosmology and quantum mechanics as just so many castles in the sky. The cost of allowing such ideas into science, say the gatekeepers, would be to clear the path for all manner of manifestly unscientific nonsense.

But for a theoretical physicist, designing sky-castles is just part of the job. Spinning new ideas about how the world could be – or in some cases, how the world definitely isn’t – is central to their work. Some structures might be built up with great care over many years, and end up with peculiar names such as inflationary multiverse or superstring theory. Others are fabricated and dismissed casually over the course of a single afternoon, found and lost again by a lone adventurer in the troposphere of thought.

That doesn’t mean it’s just freestyle sky-castle architecture out there at the frontier. The goal of scientific theory-building is to understand the nature of the world with increasing accuracy over time. All that creative energy has to hook back onto reality at some point. But turning ingenuity into fact is much more nuanced than simply announcing that all ideas must meet the inflexible standards of falsifiability and observability. These are not measures of the quality of a scientific theory. They might be neat guidelines or heuristics, but as is usually the case with simple answers, they’re also wrong, or at least only half-right.


Conceitos causais em biologia: como que os caminhos diferem dos mecanismos e por que eles importam

terça-feira, abril 03, 2018

Causal concepts in biology: How pathways differ from mechanisms and why it matters

Ross, Lauren N. (2018) Causal concepts in biology: How pathways differ from mechanisms and why it matters. [Preprint]


In the last two decades few topics in philosophy of science have received as much attention as mechanistic explanation. A significant motivation for these accounts is that scientists frequently use the term “mechanism” in their explanations of biological phenomena. While scientists appeal to a variety of causal concepts in their explanations, many philosophers argue or assume that all of these concepts are well understood with the single notion of mechanism (Robins and Craver 2009; Craver 2007). This reveals a significant problem with mainstream mechanistic accounts– although philosophers use the term “mechanism” interchangeably with other causal concepts, this is not something that scientists always do. This paper analyses two causal concepts in biology–the notions of “mechanism” and “pathway”–and how they figure in biological explanation. I argue that these concepts have unique features, that they are associated with distinct strategies of causal investigation, and that they figure in importantly different types of explanation.

Kewwords: causation, explanation, mechanism, mechanistic explanation, philosophy of biology, philosophy of neuroscience, philosophy of medicine.


Charbel Niño El-Hani, os evolucionistas não sabem o que faz a seleção natural na teoria da evolução de Darwin

No dia 28 de março este blogger publicou EXTRA! EXTRA! EXTRA! Mudança paradigmática radical na teoria da evolução destacando o artigo Processes and patterns of interaction as units of selection: An introduction to ITSNTS thinking de W. Ford Doolittle and S. Andrew Inkpen, publicado no PNAS March 26, 2018. 201722232; https://doi.org/10.1073/pnas.1722232115.

Após leitura atenta do artigo de Doolittle e Inkpen, depreende-se que os cientistas evolucionistas não sabem o que faz a seleção natural como mecanismo evolucionário, e os autores deixaram isso bem claro no artigo. Consideremos seus questionamentos.
“O pensamento ITSNTS” questiona a teoria evolutiva padrão ESN (evolução por seleção natural):

1. A seleção natural não tem uma teoria de como ela age nas comunidades.

2. Os pontos de vista padrões da seleção natural não abordam a adaptação e a função de “multiespécies.”

3. A seleção natural não pode explicar as comunidades estáveis ou comunidades bacterianas redundantes.

4. A seleção natural não pode explicar os processos que beneficiam as comunidades de reprodutores dissimilares.

5. A seleção natural não pode explicar como os processos que beneficiam as múltiplas comunidades reestabelecerem a si mesmas.

6. Dupre argumenta que “muito da biologia contemporânea defende uma ontologia geralmente mecanicista e reducionista de ‘coisa’ (ou ‘substância’).”

7. O lugar comum do livro-texto focaliza no sucesso reprodutivo dos indivíduos é um hábito de pensamento que ignora a história contingente da síntese moderna e da genética de população.

8. Algumas formulações de seleção natural são vagas porque as unidades de seleção propostas têm “demais progenitores” (a reclamação de Godfrey-Smith). Isso desnorteia os conceitos de herança.

9. A seleção natural é ambígua sobre o que “benéfico” significa. “Não é claro que qualquer propriedade pode ser considerada ‘benéfica’ a comunidades não permanentes e não reprodutoras.”

10. Algumas formulações de seleção natural violam o Princípio de William” que afirma “a adaptação em um nível requer que tenha havido seleção naquele nível.”

11. Algumas funções “são mais estáveis ou ecologicamente resilientes do que são as composições taxonômicas das montagens executando-as.” Isso demanda uma explicação evolucionária.

12. A ESN não explica facilmente a redundância.

13. A ESN é vaga na questão do que é mais relevante para a evolução: a frequência de alelos na população ou o indivíduo portando-os?

14. Os biólogos estão indecisos sobre se os memes sofrem seleção natural. Sperber é um desses ‘cético de memes’ que Doolittle menciona.

15. Os biólogos também debatem se a linguagem ou a cultura são submetidas pela seleção natural.

16. É difícil determinar se a seleção natural se constitui em um mecanismo ou uma necessidade lógica (uma premissa aceita a priori).

17. Sober argumenta que a ENS é “uma verdade a priori no sentido de que nenhum experimento poderia refutá-la.”

18. A teoria da construção de nichos é outro ‘mecanismo’ da ENS que está sendo questionado entre os evolucionistas.

19. Os evolucionistas enfrentam as “transições embaraçosas em recontar a história da vida”, tal como a etapa da unicelularidade para a multicelularidade.
20. O que é mais importante: o diferencial de reprodução ou o diferencial de persistência? O que faz mais sentido e é mais ‘satisfatório’?

21. A dificuldade de se estabelecer linhagens relevantes para a ESN pode ser assim ilustrada: “Eu sou o filho de meu pai, mas o meu coração não é a descendência do coração de meu pai.”

22. Em quais variedades pode a ESN ser comparada? A evolução das funções da comunidade microbiana através dos intestinos análoga à evolução dos lagartos pelas ilhas?

23. Antes da proposta de Doolittle, estava faltando “um jeito sensível de se discutir as adaptações e funções relevantes às comunidades e ecossistemas em geral.”

24. Alguns evolucionistas têm dito que há uma “urgente necessidade de uma estrutura [teórica] geral” para decidir o que constitui a “saúde” de um sistema.

25. Um problema importante na teoria evolucionária é o papel dos componentes abióticos em ecossistemas. Eles podem desempenhar papéis importantes, mas não são reproduzidos biologicamente. Bouchard destacou, “a evolução como mudança em frequências alélicas parecem não se aplicar aos sistemas que têm um grupo heterogêneo de alelos e materia abiótico interagindo de modo sistemático.”

26. Há um século, os biólogos têm debatido em quais níveis o “princípio tipo lei” da seleção natural de Darwin opera. Ela opera em processos bem como em coisas?


Charbel Niño El-Hani, lembra de uma conversa que tivemos após minha palestra sobre a teoria do Design Inteligente numa sessão da ABFHiB na Universidade Presbiteriana Mackenzie, São Paulo, SP, em 2007 (se não me falha a memória) na qual você me disse que eu tinha embarcado numa canoa furada. Lembra da minha resposta? Eu disse que apostava todas as minhas fichas no cavalo da TDI contra o pangaré da seleção natural de Darwin. Charbel, meu amigo, Doolittle e Inkpen estão me vindicando, e até aqui eu estou ganhando o derby.

Fui, nem sei por que rindo - mais uma vez este blogger é vindicado por evolucionistas, alguns de renome...

Convite para o abandono da significância estatística em pesquisas científicas

sábado, março 31, 2018

Abandon Statistical Significance

Blakeley B. McShane, David Gal, Andrew Gelman, Christian Robert, Jennifer L. Tackett

(Submitted on 22 Sep 2017)

In science publishing and many areas of research, the status quo is a lexicographic decision rule in which any result is first required to have a p-value that surpasses the 0.05 threshold and only then is consideration--often scant--given to such factors as prior and related evidence, plausibility of mechanism, study design and data quality, real world costs and benefits, novelty of finding, and other factors that vary by research domain. There have been recent proposals to change the p-value threshold, but instead we recommend abandoning the null hypothesis significance testing paradigm entirely, leaving p-values as just one of many pieces of information with no privileged role in scientific publication and decision making. We argue that this radical approach is both practical and sensible.

Subjects: Methodology (stat.ME)

MSC classes: 97K70

Cite as: arXiv:1709.07588 [stat.ME]

(or arXiv:1709.07588v1 [stat.ME] for this version)

Submission history

From: Andrew Gelman [view email] 

[v1] Fri, 22 Sep 2017 03:59:24 GMT (15kb)


Falem mal, mas continuem falando da teoria do Design Inteligente

Revista Científica General José María Córdova

ISSN: 1900-6586
ISSN electrónico: 2500-7645 (En línea)

Escuela Militar de Cadetes General José María Córdova
Calle 80 N° 38-00

Teléfono: 3770850 Ext. 1104

Correo electrónico: revistacientifica@esmic.edu.co

La evolución del diseño inteligente: entre religión y ciencia

Enrique Sandino Vargas, Marta Caccamo, Sumaya Hashim, Oskar Eng


Este trabajo evalúa el diseño inteligente (DI) como una pseudociencia. La ciencia ha incorporado muchas definiciones; asimismo la pseudociencia. Ambas han sido discutidas en diversos ámbitos. En lo que atañe a la esfera política, están caracterizados por una pluralidad de conflictos de visiones en discusión. No existe una sola filosofía de la ciencia, y en consecuencia tampoco una sola metodología de la ciencia. Los criterios de demarcación no son una cuestión clara. Esto se torna problemático al evaluar el diseño inteligente. El diseño, en particular, tal como lo conciben los científicos que consideran que no hay razones para incluirlo en el campo científico en su pretensión de que carece de cientificidad. Lo que hacemos aquí es seleccionar un conjunto de definiciones de pseudociencia y ver si el DI satisface los criterios de demarcación. Dado que nuestra unidad de análisis es el DI, se plantea la pregunta si el diseño inteligente es una pseudociencia, o si se puede caracterizar el diseño inteligente como una o varias formas de pseudociencia.

Palabras clave

criterios de demarcación; diseño inteligente; naturalismo; pseudociencia; método científico

Texto completo: PDF


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Um amigo destacou dois parágrafos deste artigo:

"The ID assumption is normative in that from its utterance; it requires the inference that anything, which is unexplainable by the naturalistic argument,
is designed. The scientific assumption is agnostic; it does not attribute all to evolution, it remains open-minded. In this sense, ID is pseudoscientific in that it fails to remain open-minded despite its lack of evidence and logical coherence."

Isso parece dizer que o DI é um argumento Designer das Lacunas, em vez de uma inferência a partir da complexidade especificada... e minimiza o modo que o Darwinismo atribui tudo à evolução.

Todavia, eles admitem:

"To the extent that both evolutionism and ID are based on unverifiable a priori metaphysical assumptions, on this level, ID remains comparably legitimate as the Darwinist argument. We cannot stake the assumptions of either paradigm against the other’s and claim that one is superior, as they are not comparable. In this sense, both ID and Darwinism remain sciences, legitimate under the axiom of their own a priori assumptions of the world and its creation."

Há anos salientamos que quaisquer críticas à TDI são, por tabela, críticas feitas à teoria da evolução de Darwin através da seleção natural e n mecanismos evolucionários (de A a Z, vai que um falhe...), pois sendo teorias de longo alcance histórico, a TDI e a Teoria da Evolução são metodologicamente idênticas!

Fui, nem sei por que pensando: Falem mal, mas falem da TDI...

Apresentação científica: usando práticas de sala de aula baseadas em evidência para apresentações científicas de conferência eficientes

quarta-feira, março 28, 2018

Scientific Presenting: Using Evidence-Based Classroom Practices to Deliver Effective Conference Presentations.


Amy Prunuske
University of Minnesota Medical School

Shannon B Seidel
San Francisco State University

Lisa A Corwin
Biology Department, Pacific Lutheran University, Tacoma, WA 98447

CBE Life Sci Educ 2018 ;17(1)


Scientists and educators travel great distances, spend significant time, and dedicate substantial financial resources to present at conferences. This highlights the value placed on conference interactions. Despite the importance of conferences, very little has been studied about what is learned from the presentations and how presenters can effectively achieve their goals. This essay identifies several challenges presenters face when giving conference presentations and discusses how presenters can use the tenets of scientific teaching to meet these challenges. We ask presenters the following questions:These questions target three broad goals that stem from the scientific teaching framework and that we propose are of great importance at conferences: learning, equity, and improvement. Using a backward design approach, we discuss how the lens of scientific teaching and the use of specific active-learning strategies can enhance presentations, improve their utility, and ensure that a presentation is broadly accessible to all audience members.


EXTRA! EXTRA! EXTRA! Mudança paradigmática radical na teoria da evolução

Processes and patterns of interaction as units of selection: An introduction to ITSNTS thinking

W. Ford Doolittle and S. Andrew Inkpen

PNAS March 26, 2018. 201722232; published ahead of print March 26, 2018. https://doi.org/10.1073/pnas.1722232115

Edited by Douglas Futuyma, Stony Brook University, Stony Brook, NY, and approved March 7, 2018 (received for review December 22, 2017)


Many practicing biologists accept that nothing in their discipline makes sense except in the light of evolution, and that natural selection is evolution’s principal sense-maker. But what natural selection actually is (a force or a statistical outcome, for example) and the levels of the biological hierarchy (genes, organisms, species, or even ecosystems) at which it operates directly are still actively disputed among philosophers and theoretical biologists. Most formulations of evolution by natural selection emphasize the differential reproduction of entities at one or the other of these levels. Some also recognize differential persistence, but in either case the focus is on lineages of material things: even species can be thought of as spatiotemporally restricted, if dispersed, physical beings. Few consider—as “units of selection” in their own right—the processes implemented by genes, cells, species, or communities. “It’s the song not the singer” (ITSNTS) theory does that, also claiming that evolution by natural selection of processes is more easily understood and explained as differential persistence than as differential reproduction. ITSNTS was formulated as a response to the observation that the collective functions of microbial communities (the songs) are more stably conserved and ecologically relevant than are the taxa that implement them (the singers). It aims to serve as a useful corrective to claims that “holobionts” (microbes and their animal or plant hosts) are aggregate “units of selection,” claims that often conflate meanings of that latter term. But ITSNS also seems broadly applicable, for example, to the evolution of global biogeochemical cycles and the definition of ecosystem function.

evolution natural selection process persistence microbiome



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Sem dúvida uma grande e embaraçosa mudança na Síntese Evolutiva Moderna, atual moribunda teoria da evolução que não quer ser substituída pela Síntese Evolutiva Ampliada/Estendida lançada em agosto de 2015.

Pelo abstract eles  parecem dizer que todas as unidades de seleção devem ser consideradas - genes, células, organismos, espécies, e  comunidades. E aqui este blogger vai ser bem irônico - por que não adicionar os planetas, sistemas solares, galáxias, universos, e até os imaginários multiversos! Vai que um desses inúmeros processos evolutivos falhe...

Fui, nem sei por que, mas pensando nos epiciclos ptolomaicos!

Pano rápido! Darwin kaput desde 1859, mas a Nomenklatura científica teima em não enterrar esse defunto epistemológico por razões puramente ideológicas!

Tendões são irredutivelmente complexos???

segunda-feira, março 26, 2018

In tendons, differing physiological requirements lead to functionally distinct nanostructures

Andrew S. Quigley, Stéphane Bancelin, Dylan Deska-Gauthier, François Légaré, Laurent Kreplak & Samuel P. Veres

Scientific Reports Volume 8, Article number: 4409 (2018)

Download Citation

Biomedical engineering Tendons Tissues

Received: 02 October 2017 Accepted: 28 February 2018

Published online: 13 March 2018


The collagen-based tissues of animals are hierarchical structures: even tendon, the simplest collagenous tissue, has seven to eight levels of hierarchy. Tailoring tissue structure to match physiological function can occur at many different levels. We wanted to know if the control of tissue architecture to achieve function extends down to the nanoscale level of the individual, cable-like collagen fibrils. Using tendons from young adult bovine forelimbs, we performed stress-strain experiments on single collagen fibrils extracted from tendons with positional function, and tendons with energy storing function. Collagen fibrils from the two tendon types, which have known differences in intermolecular crosslinking, showed numerous differences in their responses to elongation. Unlike those from positional tendons, fibrils from energy storing tendons showed high strain stiffening and resistance to disruption in both molecular packing and conformation, helping to explain how these high stress tissues withstand millions of loading cycles with little reparative remodeling. Functional differences in load-bearing tissues are accompanied by important differences in nanoscale collagen fibril structure.


This work was supported by grants to SPV and LK from the Natural Sciences and Engineering Research Council of Canada (NSERC).

Author information


Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Canada

Andrew S. Quigley & Laurent Kreplak

Institut National de la Recherche Scientifique, Centre Énergie, Matériaux, Télécommunication, Varennes, Canada

Stéphane Bancelin & François Légaré

Department of Medical Neuroscience, Dalhousie University, Halifax, Canada

Dylan Deska-Gauthier

School of Biomedical Engineering, Dalhousie University, Halifax, Canada

Laurent Kreplak & Samuel P. Veres

Division of Engineering, Saint Mary’s University, Halifax, Canada

Samuel P. Veres


S.P.V. and L.K. conceived the study; A.S.Q. performed the A.F.M. work and data analysis; S.B. performed the S.H.G. work and analysis under the supervision of F.L.; D.D.G. performed the confocal microscopy; all authors contributed to the writing of the manuscript.

Competing Interests

The authors declare no competing interests.

Corresponding authors

Correspondence to Laurent Kreplak or Samuel P. Veres.

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