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lunedì 17 giugno 2024
# gst: breakup of Janus droplet in a bifurcating microchannel
martedì 3 novembre 2020
# life: the 'built-in float' of an ancient marine predator
venerdì 14 aprile 2023
# gst: even a single bubble can produce creative musical outcomes
mercoledì 15 febbraio 2023
# gst: when a soliton juggles ('catches' and 'throws') droplets
domenica 21 febbraio 2016
# s-chem: a metal that behaves like water
<< graphene’s two-dimensional, honeycomb structure acts like an electron superhighway in which all the particles have to travel in the same lane. The electrons in this ultra-clean graphene act like massless relativistic objects, some with positive charge and some with negative charge. They move at incredible speed — 1/300 of the speed of light — and have been predicted to collide with each other ten trillion times a second at room temperature. These intense interactions between charge particles have never been observed in an ordinary metal before >>
<< When the strongly interacting particles in graphene were driven by an electric field, they behaved not like individual particles but like a fluid that could be described by hydrodynamics >>
http://www.kurzweilai.net/a-black-hole-on-a-chip-made-of-a-metal-that-behaves-like-water
Jesse Crossno, Jing K. Shi, et al. Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene. Science 11 Feb 2016 DOI: 10.1126/science.aad0343
http://science.sciencemag.org/content/early/2016/02/10/science.aad0343
mercoledì 14 marzo 2018
# gst: chemical waves exhibit fascinating patterns
<< Waves are known in many very different forms; as water waves, light waves or sound waves. But here we are dealing with something quite different - chemical waves >>
<< Typically, one imagines a chemical reaction like this: from specific initial reactants one obtains specific final products. But it does not need to be as simple as that. Self-sustaining oscillations may occur, i.e. periodic changes between two different states >>
<< On a polycrystalline surface, there are then different regions in which the cyclical process occurs at different frequencies. It is precisely this effect that creates those fascinating wave patterns. When a chemical wave moves across the surface and passes from the edge of one grain of crystal to another, it speeds up or slows down, similar to light passing from the air to water. This changes the complex spiral wave structures according to the particular orientation of the grain surface >>
Vienna University of Technology. Chemical waves guide to catalysts of the future. Feb 20, 2018.
https://m.phys.org/news/2018-02-chemical-catalysts-future.html
Yuri Suchorski, Martin Datler, et al. Visualizing catalyst heterogeneity by a multifrequential oscillating reaction. Nature Communication. 2018; 9 (600). doi: 10.1038/s41467-018-03007-3. Feb 9, 2018.
lunedì 28 dicembre 2015
# s-ecol-food: lettuce three times worse ?
<< Contrary to recent headlines (..) eating a vegetarian diet could contribute to climate change >>
<< Eating lettuce is over three times worse in greenhouse gas emissions than eating bacon >>
http://www.cmu.edu/news/stories/archives/2015/december/diet-and-environment.html
<< This article measures the changes in energy use, blue water footprint, and greenhouse gas (GHG) emissions associated with shifting from current US food consumption patterns to three dietary scenarios >>
Michelle S. Tom, Paul S. Fischbeck, Chris T. Hendrickson. Energy use, blue water footprint, and greenhouse gas emissions for current food consumption patterns and dietary recommendations in the US. Environment Systems and Decisions, 2015; DOI: 10.1007/s10669-015-9577-y
http://link.springer.com/article/10.1007%2Fs10669-015-9577-y
martedì 10 marzo 2020
# gst: apropos of 'transitions', liquid-liquid transitions within a one- component system
giovedì 28 settembre 2023
# gst: reconfiguration and oscillations of sheets subject to vortex
giovedì 17 ottobre 2019
# gst: fingerprints of reality (2): the stormquake
sabato 19 dicembre 2015
# rmx-s-chem: a bizarre material
<< lanthanum aluminate film on a strontinum titanate crystal >> ... plus water
<< (..) a mysterious material emits ultraviolet light and has insulating, electrical conducting, semiconducting, superconducting, and ferromagnetic properties — all controlled by surface water >>
http://www.kurzweilai.net/mystery-material-stuns-scientists
Mohammad A. Islam, Diomedes Saldana-Greco, et al. Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas. Nano Letters, 2015; DOI: 10.1021/acs.nanolett.5b04461
venerdì 25 giugno 2021
# gst: apropos of transitions, tsunami waves generated by granular collapses.
martedì 30 luglio 2024
# gst: collapse of a toroidal bubble inducing shock waves
sabato 7 dicembre 2019
# gst: apropos of clogging and jamming, they are not really jammed, they move steadily, if slowly, downwards
lunedì 8 maggio 2017
s-ecol: inflatable poo emojis (onto Lake Ohakuri) to underline new standards
<< Protesters from the Action Station group launched 50 inflatable poo emojis onto Lake Ohakuri on the Waikato River near to where the ruling National Party was holding a conference, to highlight new standards which it says would mean more contaminants in freshwater, the New Zealand Herald reports >>
'Poo protest' against New Zealand government. 7 May 2017
http://www.bbc.com/news/blogs-news-from-elsewhere-39835394
https://twitter.com/BBCNewsAsia/status/861165092280438788
Russell Blackstock. Flotilla of inflatable poos launched by water protesters. Sat. 06 May 2017.
http://m.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11851116
venerdì 5 ottobre 2018
# biochem: how an artificial enzyme can convert solar energy into hydrogen gas
<< Hydrogen gas has long been noted as a promising energy carrier, but its production is still dependent on fossil raw materials. Renewable hydrogen gas can be extracted from water, but as yet the systems for doing so have limitations. In the new article, published in the journal Energy and Environmental Science, an interdisciplinary European research group led by Uppsala University scientists describe how artificial enzymes convert solar energy into hydrogen gas. >>
Artificial enzymes convert solar energy into hydrogen gas. Uppsala University.
Oct 4, 2018.
https://m.phys.org/news/2018-10-artificial-enzymes-solar-energy-hydrogen.html
Adam Wegelius, Namita Khanna, et al. Generation of a functional, semisynthetic [FeFe]-hydrogenase in a photosynthetic microorganism. Energy Environ. Sci. 2018, 1754-5692 doi: 10.1039/C8EE01975D. Sep 25, 2018.
https://pubs.rsc.org/en/Content/ArticleLanding/2018/EE/C8EE01975D#!divAbstract
giovedì 1 settembre 2022
# gst: apropos of transitions, evaporating binary microdroplets with phase segregation
martedì 24 settembre 2019
# gst: apropos of weak bonds, hydrophobic cohesion to stabilize the double helix of DNA
<< The main stabilizer of the DNA double helix is not the base-pair hydrogen bonds but coin-pile stacking of base pairs, whose hydrophobic cohesion, requiring abundant water, indirectly makes the DNA interior dry so that hydrogen bonds can exert full recognition power. (..) (AA) speculate that hydrophobic catalysis is a general phenomenon in DNA enzymes. >>
<< The forces that stabilize the DNA double helix are a prerequisite for the secure storage of genetic information but their modest strength is also necessary for the efficient processes of replication, transcription, recombination, and repair systems-wherein thermal fluctuations, or "breathing," play an important role >>
Bobo Feng, Robert P. Sosa, et al. Hydrophobic catalysis and a potential biological role of DNA unstacking induced by environment effects. PNAS. 116 (35) 17169-17174; Aug 27, 2019. doi: 10.1073/ pnas.1909122116. https://www.pnas.org/content/116/35/17169
DNA is held together by hydrophobic forces. Chalmers University of Technology. Sep 23, 2019. https://m.phys.org/news/2019-09-dna-held-hydrophobic.html