All posts; Tags Include "Evolutionary Anthropology"
- November 3, 2013
- 03:28 PM
- 1,084 views
The puzzling end of a black hole
by Perikis Livas in Chilon
Do black holes exist for ever ?
According to Hawking radiation, a black hole completely evaporates away within a finite time.
Three basic alternate scenarios are examined in this feature.
Articles
Black holes shrink but endure | Nature
Astrophysical black holes may radiate, but they do not evaporate | Cornell University Library... Read more »
Ron Cowen. (2013) Black holes shrink but endure. Nature. DOI: 10.1038/502603a
George F R Ellis. (2013) Astrophysical black holes may radiate, but they do not evaporate. Cornell University Library. arXiv: 1310.4771v2
- November 3, 2013
- 11:56 AM
- 872 views
Physicists Find Black Holes in Globular Star Clusters, Upsetting 40 Years of Theory
by Perikis Livas in Chilon
Introduction
The discovery of two black holes in a globular star cluster challenges scientists.
Stars’ collisions that happen in a cluster were thought to kick out any black holes that formed like water molecules that get hot enough to turn to steam and they are let go from their environment to float off into the atmosphere even though the coffee may be below the boiling temperature of water.
This feature includes a Texas Tech University’s article Physicists Find Black Holes i........ Read more »
Laura Chomiuk, Jay Strader, Thomas J. Maccarone, James C. A. Miller-Jones, Craig Heinke, Eva Noyola, Anil C. Seth, & Scott Ransom. (2013) A Radio-Selected Black Hole X-ray Binary Candidate in the Milky Way Globular Cluster M62. Cornell University Library. DOI: arXiv:1306.6624v2
- November 1, 2013
- 11:41 AM
- 985 views
Why Matter Exists
by Perikis Livas in Chilon
Why Matter Exists
For now this remains a good question for physicists.
The exceptional article Search Escalates for Key to Why Matter Exists published on Quanta Magazine, refers to a scientific painstaking search for one of the rarest radioactive decay processes in the universe — if it exists.
This chemical decay could present a solution to one of the biggest mysteries in physics: why there is something rather than nothing in the universe.
Natalie Wolchover, author of the article, ........ Read more »
Chee Sheng Fong, Enrico Nardi, & Antonio Riotto. (2012) Leptogenesis in the Universe. Advances in High Energy Physics. DOI: arXiv:1301.3062v1
M. Agostini, M. Allardt, E. Andreotti, A. M. Bakalyarov, M. Balata, I. Barabanov, M. Barnabé Heider, N. Barros, L. Baudis, C. Bauer.... (2013) Results on neutrinoless double beta decay of 76Ge from GERDA Phase I. Cornell University Library. arXiv: 1307.4720v1
Laurent Canetti, Marco Drewes, & Mikhail Shaposhnikov. (2012) Matter and Antimatter in the Universe. New J. Phys. 14 (2012) 095012. arXiv: 1204.4186v2
- October 31, 2013
- 10:26 AM
- 972 views
The Antarctic’s puzzling ice sheet
by Perikis Livas in Chilon
Is Antarctica losing or gaining ice?
The overwhelming evidence is that the Southern Ocean is warming, said author Jinlun Zhang, an oceanographer at the UW Applied Physics Laboratory.
Why would sea ice be increasing ? Although the rate of increase is small, it is a puzzle to scientists.
Scientific observations on Antarctica’s ice sheet thickness emerge questions about probable causes and differences in correlation with the Arctic glaciers.
This review includes a reference research........ Read more »
Jinlun Zhang. (2013) Modeling the impact of wind intensification on Antarctic sea ice volume. Journal of Climate. DOI: 10.1175/JCLI-D-12-00139.1
- October 30, 2013
- 07:52 AM
- 881 views
Paleontologist Presents Origin of Life Theory
by Perikis Livas in Chilon
Sankar Chatterjee presents what he calls the “Holy Grail of science” to Geological Society of America.
It has baffled humans for millennia: how did life begin on planet Earth? Now, new research from a Texas Tech University paleontologist suggests it may have rained from the skies and started in the bowels of hell.
Sankar Chatterjee, Horn Professor of Geosciences and curator of paleontology at the Museum of Texas Tech University believes he has found the answer by connecting ........ Read more »
John Davis. (2013) Paleontologist Presents Origin of Life Theory. Texas Tech Today. info:/
- October 29, 2013
- 05:22 PM
- 811 views
Second Solar System detected (attachment)
by Perikis Livas in Chilon
Attachment to the article ” Second Solar System detected ”
_
Reference Paper: The Planetary System to KIC 11442793: A Compact Analogue to the Solar System
Cornell University Library... Read more »
J. Cabrera, Sz. Csizmadia, H. Lehmann, R. Dvorak, D. Gandolfi, H. Rauer, A. Erikson, C. Dreyer, Ph. Eigmueller, & A. Hatzes. (2013) The Planetary System to KIC 11442793: A Compact Analogue to the Solar System. Cornell University Library. arXiv: 1310.6248v1
- October 29, 2013
- 01:46 PM
- 1,035 views
Second Solar System detected
by Perikis Livas in Chilon
A team of astrophysicists at the German Aerospace Center (Deutsches Zentrum für Luft und- Raumfahrt; DLR), together with German and European colleagues, has discovered the most extensive planetary system to date. Seven planets circle the star KOI-351 – more than in other known planetary systems. They are arranged in a similar fashion to the eight planets in the Solar System, with small rocky planets close to the parent star and gas giant planets at greater distances. Although the plan........ Read more »
German Aerospace Center. (2013) Second Solar System detected. DLR Portal News. info:/
- October 29, 2013
- 09:51 AM
- 697 views
Hydrogel implant enables light-based communication with cells inside the body
by Perikis Livas in Chilon
Research enables development of novel therapies based on polymer hydrogel patches that are capable of supporting living cells and guiding light.These hydrogels are used to perform in-vivo optical sensing and therapy in living mice.
This post includes the original report of the Massachusetts General Hospital, links to the Wellman Center for Photomedicine at Massachusetts General Hospital and to the Harvard’s Medical School report, the reference paper from Nature Photonics and two quite exp........ Read more »
Myunghwan Choi, Jin Woo Choi, Seonghoon Kim, Sedat Nizamoglu, Sei Kwang Hahn, & Seok Hyun Yun. (2013) Light-guiding hydrogels for cell-based sensing and optogenetic synthesis in vivo. Nature Photonics. DOI: 10.1038/nphoton.2013.278
- October 25, 2013
- 12:36 PM
- 1,074 views
Quaternary geology, geomorphology, sedimentology, stratigraphy, tectonics, environmental geology and biogeochemistry
by Perikis Livas in Chilon
The Department of Geology in the University of Cincinnati’s McMicken College of Arts & Sciences is a nationally ranked program with high-caliber faculty and a strong research reputation. The department’s strength is based on teaching and research in many areas of the geosciences including paleontology (a program ranked 6th in the nation), Quaternary geology, geomorphology, sedimentology, stratigraphy, tectonics, environmental geology, and biogeochemistry. That varied array of interes........ Read more »
University of Cincinnati, & The Geological Society of America. (2013) Quaternary geology, geomorphology, sedimentology, stratigraphy, tectonics, environmental geology and biogeochemistry. Tracing Knowledge. info:/
- October 25, 2013
- 06:00 AM
- 1,046 views
Ignorance is sometimes bliss
by Perikis Livas in Chilon
A range of examples suggests a lack of information about their fellows can favor cooperation and prevent conflict among animals — and even among genes
For the Oct. 16 issue of Biology Letters, a special issue commemorating the 50th anniversary of W.D. Hamilton’s famous paper on kin selection, two Washington University in St. Louis biologists contributed an article describing intriguing exceptions to one of his predictions.
The basic idea of natural selection is to pass on you........ Read more »
David C. Queller, & Joan E. Strassmann. (2013) The veil of ignorance can favour biological cooperation. Biology Letters. DOI: 10.1098/rsbl.2013.0365
David W. Hall, Soojin V. Yi, & Michael A. D. Goodisman. (2013) Kin selection, genomics and caste-antagonistic pleiotropy. Biology Letters. DOI: 10.1098/rsbl.2013.0309
Joan M. Herbers. (2013) 50 Years on: the legacy of William Donald Hamilton. Biology Letters. DOI: 10.1098/rsbl.2013.0792
- October 24, 2013
- 11:05 AM
- 1,364 views
Study: No known hominin is ancestor of Neanderthals and modern humans
by Perikis Livas in Chilon
BLOOMINGTON, Ind. — The search for a common ancestor linking modern humans with the Neanderthals who lived in Europe thousands of years ago has been a compelling subject for research. But a new study suggests the quest isn’t nearly complete.... Read more »
Gómez-Robles A, Bermúdez de Castro JM, Arsuaga JL, Carbonell E, & Polly PD. (2013) No known hominin species matches the expected dental morphology of the last common ancestor of Neanderthals and modern humans. Proceedings of the National Academy of Sciences of the United States of America. PMID: 24145426
- October 24, 2013
- 06:49 AM
- 744 views
Research in the News: How new neurons are born
by Perikis Livas in Chilon
The birth of new neurons depend upon activation of an important molecular pathway in stem cells, a new Yale School of Medicine study shows.... Read more »
Hartman NW, Lin TV, Zhang L, Paquelet GE, Feliciano DM, & Bordey A. (2013) mTORC1 Targets the Translational Repressor 4E-BP2, but Not S6 Kinase 1/2, to Regulate Neural Stem Cell Self-Renewal In Vivo. Cell reports. PMID: 24139800
- October 22, 2013
- 06:00 AM
- 1,013 views
Evolution is not a one-way road towards complexity
by Perikis Livas in Chilon
Development of cryptic worms provides new insights into molluscan evolution.
There are still a lot of unanswered questions about mollusks, e.g. snails, slugs and mussels. The research group of Andreas Wanninger, Head of the Department of Integrative Zoology of the University of Vienna, took a detailed look at the development of cryptic worms. The larvae of the “wirenia argentea” hold a much more complex muscular architecture than their adults – they remodel during their metamo........ Read more »
Maik Scherholz, Emanuel Redl, Tim Wollesen, Christiane Todt, & Andreas Wanninger. (2013) Aplacophoran Mollusks Evolved from Ancestors with Polyplacophoran-like Features. Cell Press Current Biology. DOI: 10.1016/j.cub.2013.08.056
- October 21, 2013
- 03:07 PM
- 777 views
Towards a better understanding of inherited hearing loss
by Perikis Livas in Chilon
A team of researchers led by Dr. Michel Cayouette made an important discovery, published online yesterday by the scientific journal Developmental Cell, that could better explain some inherited forms of hearing loss in humans. Dr. Michel Cayouette is a professor at the IRCM and Université de Montréal, The Montréal scientists identified a group of proteins crucial for shaping the cellular organ responsible for detecting sounds.... Read more »
Basile Tarchini, Christine Jolicoeur, & Michel Cayouette. (2013) A Molecular Blueprint at the Apical Surface Establishes Planar Asymmetry in Cochlear Hair Cells. Developmental Cell, Volume 27(1), 88-102. DOI: 10.1016/j.devcel.2013.09.011
- October 21, 2013
- 02:10 PM
- 767 views
Hatchling lizards are smarter than you think
by Perikis Livas in Chilon
A collaborative research team from Macquarie University and Sydney University have discovered that young (hatchling) lizards are capable of learning complex tasks, particularly if they hatched from eggs incubated at warmer temperatures.... Read more »
Benjamin F. Clark, Joshua J. Amiel, Richard Shine, Daniel W. A. Noble, & Martin J. Whiting. (2013) Colour discrimination and associative learning in hatchling lizards incubated at �hot’ and �cold’ temperatures. Behavioral Ecology and Sociobiology, Springer Berlin Heidelberg. DOI: 10.1007/s00265-013-1639-x
- October 21, 2013
- 04:39 AM
- 1,354 views
Gene regulation differences between humans and chimpanzees more complex than thought
by Perikis Livas in Chilon
Changes in gene regulation have been used to study the evolutionary chasm that exists between humans and chimpanzees despite their largely identical DNA.
However, scientists from the University of Chicago have discovered that mRNA expression levels, long considered a barometer for differences in gene regulation, often do not reflect differences in protein expression — and, therefore, biological function — between humans and chimpanzees. The work was published Oct. 17 in Science......... Read more »
Khan Z, Ford MJ, Cusanovich DA, Mitrano A, Pritchard JK, & Gilad Y. (2013) Primate Transcript and Protein Expression Levels Evolve under Compensatory Selection Pressures. Science (New York, N.Y.). PMID: 24136357
- October 19, 2013
- 03:44 PM
- 995 views
Why Spinoza Was Excommunicated
by Perikis Livas in Chilon
...Spinoza seems to have taken his herem in stride. By this point he had lost his religious faith such as it was, and, as his secular philosophical studies progressed under the direction of Franciscus van den Enden, his Latin tutor, he was drifting away from engagement with Jewish religious traditions and toward ancient and modern republican political theory, classical Latin literature, and especially the writings of René Descartes, the great French philosopher...... Read more »
Steven Nadler. (2013) Why Spinoza Was Excommunicated. Humanities. info:/
- October 19, 2013
- 02:58 PM
- 1,031 views
UCLA psychologists report new insights on human brain, consciousness
by Perikis Livas in Chilon
UCLA psychologists have used brain-imaging techniques to study what happens to the human brain when it slips into unconsciousness. Their research, published Oct. 17 in the online journal PLOS Computational Biology, is an initial step toward developing a scientific definition of consciousness.... Read more »
Martin M. Monti, Evan S. Lutkenhoff, Mikail Rubinov, Pierre Boveroux, Audrey Vanhaudenhuyse, Olivia Gosseries, Marie-Aurélie Bruno, Quentin Noirhomme, Mélanie Boly, & Steven Laureys. (2013) Dynamic Change of Global and Local Information Processing in Propofol-Induced Loss and Recovery of Consciousness. PLoS Computational Biology. DOI: 10.1371/journal.pcbi.1003271
- October 18, 2013
- 07:38 AM
- 787 views
Unique skull find rebuts theories on species diversity in early humans
by Perikis Livas in Chilon
Paleoanthropologists from the University of Zurich have uncovered the intact skull of an early Homo individual in Dmanisi, Georgia. This find is forcing a change in perspective in the field of paleoanthropology: human species diversity two million years ago was much smaller than presumed thus far. However, diversity within the «Homo erectus», the first global species of human, was as great as in humans today.... Read more »
David Lordkipanidze, Marcia S. Ponce de León, Ann Margvelashvili, Yoel Rak, G. Philip Rightmire, Abesalom Vekua, & Christoph P. E. Zollikofer. (2013) A Complete Skull from Dmanisi, Georgia, and the Evolutionary Biology of Early Homo. Science AAAS. DOI: 10.1126/science.1238484
Margvelashvili A, Zollikofer CP, Lordkipanidze D, Peltomäki T, & Ponce de León MS. (2013) Tooth wear and dentoalveolar remodeling are key factors of morphological variation in the Dmanisi mandibles. Proceedings of the National Academy of Sciences of the United States of America. PMID: 24101504
- October 16, 2013
- 02:41 PM
- 787 views
Competitive Trace Theory: A Role for the Hippocampus in Contextual Interference during Retrieval
by Perikis Livas in Chilon
Much controversy exists regarding the role of the hippocampus in retrieval. The two dominant and competing accounts have been the Standard Model of Systems Consolidation (SMSC) and Multiple Trace Theory (MTT), which specifically make opposing predictions as to the necessity of the hippocampus for retrieval of remote memories. Under SMSC, memories eventually become independent of the hippocampus as they become more reliant on cortical connectivity, and thus the hippocampus is not required for ret........ Read more »
Yassa MA, & Reagh ZM. (2013) Competitive Trace Theory: A Role for the Hippocampus in Contextual Interference during Retrieval. Frontiers in behavioral neuroscience, 107. PMID: 23964216
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