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Visualizzazione dei post in ordine di data per la query dance. Ordina per pertinenza Mostra tutti i post
Visualizzazione dei post in ordine di data per la query dance. Ordina per pertinenza Mostra tutti i post

mercoledì 21 febbraio 2024

# gst: when volatile droplets dance across a surface erratically (along random trajectories)

<< When a drop of a volatile liquid is deposited on a uniformly heated wettable, thermally conducting substrate, one expects to see it spread into a thin film and evaporate. >>️

<< Contrary to this intuition, due to thermal Marangoni contraction, the deposited drop contracts into a spherical-cap-shaped puddle, with a finite apparent contact angle. Strikingly, this contracted droplet, above a threshold temperature, well below the boiling point of the liquid, starts to spontaneously move on the substrate in an apparently erratic way. >>️

Pallav Kant, Mathieu Souzy, et al. Autothermotaxis of volatile drops. Phys. Rev. Fluids 9, L012001. Jan 31, 2024. 

Rachel Berkowitz. Hot Surfaces Make Droplets Move Erratically. Physics 17, s14. Jan 31, 2024. 

Also: drop, bubble, erratic

Keywords: gst, drop, bubble, erratic, thermotaxis, autothermotaxis


venerdì 17 novembre 2023

# behav: the self-care hypothesis of the puteketeke bird (great crested grebe, Podiceps cristatus)

<< The Puteketeke bird has been elected as New Zealand's Bird of the Century after John Oliver promoted the bird not just on his show, but around the world. >>

<< It also exhibits some unusual antics, like eating feathers to help it vomit up parasites,  >> AILSA CHANG
<< They have a mating dance where they both grab a clump of wet grass and chest bump each other... >> JOHN OLIVER

Kat Lonsdorf, Christopher Intagliata. The Puteketeke bird has been elected as New Zealand's Bird of the Century. npr.org Nov 15, 2023. 

L’uccello del secolo della Nuova Zelanda l’ha deciso John Oliver. ilpost.it. Nov 15, 2023. 


John Oliver, an interview: https://youtu.be/uVE1hBzHn3s

many thanks to Tammi ( https://www.inkgmr.net/tammi ) for this news. 

Also: Self-perception of health and survival. A 10-year follow-up among Italians aged over sixty. INRCA, Technical Report, Genova, 7 March 1995: 1-19. Minerva Med 1997 Jan-Feb 88:1-2 15-23. [abst] https://pubmed.ncbi.nlm.nih.gov/9093288/

Also: 'behav', 'perception', in https://www.inkgmr.net/kwrds.html

Keywords: behaviour, self-care, perceptions


lunedì 14 agosto 2023

# gst: rich behaviors from stochastic walking with variable long jumps.


AA << propose a generalized model where the random walker takes stochastic jumps of lengths proportional to its present position with certain probability, otherwise it makes forward and backward jumps of fixed (unit) length with given rates. The model exhibits a rich stochastic dynamic behavior.  (AA) obtain exact analytic results for the first two moments of the walker's displacement and show that a phase transition from a diffusive to superdiffusive regime occurs if the stochastic jumps of lengths that are twice (or more) of its present positions are allowed. This phase transition is accompanied by a reentrant diffusive behavior. >> 

Upendra Harbola. Stochastic walker with variable long jumps. Phys. Rev. E 108, 014135. July 28, 2023. 

Also: walk, noise, fluctuations, dance,  in: https://www.inkgmr.net/kwrds.html

Keywords: gst, walks, random walks, noise, fluctuations



lunedì 27 febbraio 2023

# life: a proposito di bizzarri scenari, qui una transizione 'a gradino' di ipotetico scenario22


Congo Square, New Orleans (img from web).  https://en.m.wikipedia.org/wiki/Congo_Square

Una senz'altro immaginifica transizione di un sistema anch'esso senz'altro immaginifico "3vs3 palle

qui potrebbe verificarsi una improvvisa mutazione "3vs3" verso un sistema auto- riconfigurato in "4vs2" palle.

(-) In prima approx il sistema destrogiro "4palle", sebbene caotico,  quasisticastico, potrebbe dimostrare chance di creativa stabilizzazione, anche a medio-lungo termine, anche grazie a non del tutto improbabili episodi di drammatiche funzionali fagocitosi (e.g. nelle forme predatorie del cannibalismo/ auto- cannibalismo, anche orgiastico estremo) al proprio interno.

(-) Il sistema levogiro "2palle" potrebbe invece lui medesimo risultare vincente sull'altro destrogiro nel caso riuscisse nell'im.probabile stabilizzazione,  ristrutturazione funzionale - dimostrando pubblicamente non banali capacità di risoluzione/ reimpostazione di problemi - perciò animandosi in modalità attrattive, coagulative su una parte significativa del 50% di quelle moltitudini verosimilmente costituite da entità fluttuanti nella solitaria condizione di pulviscoli erratici in emarginata sublimazione.

L'immagini, senz'altro campate in aria purtuttavia intriganti:  'episodi di drammatiche funzionali fagocitosi', 'cannibalismo, auto-cannibalismo anche orgiastico estremo' e 'solitaria condizione di pulviscoli erratici in emarginata sublimazione' meriterebbero una serie di poetiche, quasistocastiche perfino

ma mi astengo.

# life: a proposito di bizzarri scenari, qui un ipotetico scenario22 dipinto dal reale ... FonT.  Oct 17,  2022.

Also

<< Tornando all'analogia con la fisica, il potere, come l'energia, muta continuamente di forma >>. In: Onda anti rumore. Notes (quasi-stochastic poetry). April 21, 2005.

keyword 'dance' | 'dancing' in FonT


keyword 'danza' | 'danzant*' in Notes
(quasi-stochastic poetry)



Keywords: life, gst, Congo Square, danza, dance, jazz, Jelly Roll, transition, three-body




venerdì 10 febbraio 2023

# gst: apropos of transitions, a perpetual dance between states of meta-stability and chaos (in brain).


<< Hello! Today: new research is shining a light on how our brains flit between states of stability and chaos, depending on what we’re doing. >>

<< Our brains exist in a state somewhere between stability and chaos as they help us make sense of the world, according to recordings of brain activity taken from volunteers over the course of a week. >>

<< As we go from reading a book to chatting with a friend, for example, our brains shift from one semi-stable state to another—but only after chaotically zipping through multiple other states in a pattern that looks completely random. >>

<< Understanding how our brains restore some degree of stability after chaos could help us work out how to treat disorders at either end of this spectrum. Too much chaos is probably what happens when a person has a seizure, whereas too much stability might leave a person comatose. >>

Jessica Hamzelou. Neuroscientists listened in on people’s brains for a week. They found order and chaos. Rhiannon Williams. MIT Download. Feb 8, 2023.


<< The team (Avniel Ghuman, Maxwell Wang, et al.) found some surprising patterns in brain activity over the course of the week. Specific brain networks seemed to communicate with each other in what looked like a “dance,” with one region appearing to “listen” while the other “spoke,” say the researchers, who presented their findings at the Society for Neuroscience annual meeting in San Diego last year. >>

Jessica Hamzelou. MIT Tech Rev. Feb 7, 2023. 

Also 

keyword 'danza' in Notes
(quasi-stochastic poetry)

keyword 'dance' in FonT

keyword 'cervello' | 'brain' in Notes
(quasi-stochastic poetry)


keyword 'brain' in FonT

keyword 'chaos' | 'chaotic' in Font


keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)


<< Amico, qualunque  cosa suonerai . . . >>  Jelly Roll Morton. cit.: 2113 - soniche a ramulo. Jan 28, 2007


Keywords: gst, brain, transition, chaos, dance



domenica 13 novembre 2022

# life: Banksy, Banksy type dancers

<< Graffiti of a woman in a leotard doing a handstand is seen on the wall of a destroyed building in Borodyanka on Friday in Kyiv Region, Ukraine. Banksy later confirmed on their Instagram account that this piece was their work. Ed Ram/Getty Images >>️

<< Other new murals with a similar style have been spotted in the area and are suspected to have been created by Banksy, but the British artist has not publicly claimed credit. >>

Ashley Ahn. A new Banksy mural adorns a destroyed building in Ukraine. Nov 12, 2022. 10:56 AM ET.


Also

(-) 'danza' in Notes
(quasi-stochastic poetry)

(-) 'dance' in FonT

(-) 'vladimir' in FonT

Keywords: life, art, arts, paintings, music, jazz, dance, dancer





mercoledì 10 agosto 2022

# gst: a rocking shadow dance: the broken disk.

AA << reveal a new phenomenon dubbed the "rocking shadow" effect that describes how disks in forming planetary systems are oriented, and how they move around their host star. The effect also gives clues as to how they might evolve with time. >>

<< Protoplanetary disks are often thought to be shaped like dinner plates—thin, round and flat. However, recent telescope images from the Atacama Large Millimeter/Submillimeter Array (ALMA) show that this is not always the case. Some of the disks seen by ALMA have shadows on them, where the part of the disk closest to the star blocks some of the stellar light and casts a shadow onto the outer part of the disk. From this shadow pattern, it can be inferred that the inner part of the disk is oriented completely differently to the outer part, in what is called a broken disk. >>️️

<< As the inner disk moved through the gravitational pull of the central star, the shadow it cast moved across the outer disk. But instead of the shadow pattern moving around the disk like a clock-hand as expected, it rocked back and forth with a see-saw-like motion. So although the inside disk kept turning in the same direction, its shadow looked like it was rocking forwards and backwards. >>
Examining rocking shadows in protoplanetary disks. Royal Astronomical Society. Jul 15, 2022.


Rocking shadows in broken 
circumbinary discs. 


The National Astronomy Meeting (NAM) 2022. The University of Warwick, 11th. Jul 15, 2022.



keywords: gst, astro, shadow, rocking shadow, broken disc






sabato 4 dicembre 2021

# life: apropos of 'dancing at a fixed point'

the last interview to Dr Albert Bourla (Pfizer) about the annual (or maybe semi-annual (?)) shot reiteration of the vaccine against #sars-cov-2   remember to me the 'homoclinic dynamics' that I cited at the 13th Meeting of the Internat Epidemiol Associat - IEA (Sydney, 1993) ... after a large trajectories started at zero point (i.e.  the fixed point), the final point of the dynamic returns at the same zero point ...

<< People will be likely to need to have annual Covid vaccinations for many years to come, the head of Pfizer [Dr Albert Bourla ] has told the BBC >>️

Fergus Walsh. Pfizer boss: Annual Covid jabs for years to come. Dec 2, 2021. 


Who knows if there is a convincing reason that explains why to treat a virus with a high frequency of mutations one should prefer a vaccine approach instead of an antiviral drug ...

to find: 'antiviral drugs covid-19'  


Apropos of 'homoclinic orbits' ...

<< the reinjection of the departing trajectories in the vicinity of an unstable fixed point of the saddle-focus type [..] is frequently associated with the emergence of orbits of a rather exceptional type known as 'homoclinic orbits'. These are trajectories that leave the fixed point but come back to it; in other words, they tend to the same limit when time t goes to +∞ as well as to -∞ . [..]. Homoclinic orbits are very sensitive to variation of parameter [parms] values and are generally destroyed if the [parms] do not satisfy a strict equality (in the terminology of [..] they are structurally unstable). However, for nearby values of the [parms] their disappearance leaves a very rich structure of orbit in phase space, some of which behave chaotically. >>️

Nicolis G., Prigogine I. Exploring complexity. Freeman, NY (1989): 130-131.


Apropos of: [+∞ , -∞] plus infinity, minus infinity; 

<< In modern mysticism, the infinity symbol has become identified with a variation of the ouroboros, an ancient image of a snake eating its own tail that has also come to symbolize the infinite, [..] >> 


Also 

Onda omoclina. Notes. Tuesday, Jan  11, 2005 (quasi-stochastic poetry)

<< ed assistere al mutar dell' onda omoclina / (..) >>

Also

Inchingolo GM.  Cultural transitions and epidemiology.  Proceedings of the 13th Scientific Meeting of the International Epidemiological Association - IEA, Sydney, Australia, Sept 26-29, 1993: 129.   Med Hypotheses 1994; 43(4): 201-206.


Also

Onda di carambola. Notes. Nov  29, 2004. (quasi-stochastic poetry)


keywords: life, dance, fixed point, homoclinic orbits, instability, chaos,  virus, coronavirus, sars-cov-2,  covid19, 2019ncov, drugs, antiviral drug, vaccine, jabs, Covid jabs.

giovedì 29 luglio 2021

# life: apropos of fuzzy cooperation, Ralph fuzzy mixture vs. world fuzzy dance ...

<< In 2013, the American virologist Ralph Baric approached Zhengli Shi at a meeting. Baric was a top expert in coronaviruses, with hundreds of papers to his credit, and Shi, along with her team at the Wuhan Institute of Virology, had been discovering them by the fistful in bat caves. In one sample of bat guano, Shi had detected the genome of a new virus, called SHC014, that was one of the two closest relatives to the original SARS virus, but her team had not been able to culture it in the lab. >>️

<< Baric had developed a way around that problem—a technique for “reverse genetics” in coronaviruses. Not only did it allow him to bring an actual virus to life from its genetic code, but he could mix and match parts of multiple viruses. He wanted to take the “spike” gene from SHC014 and move it into a genetic copy of the SARS virus he already had in his lab. The spike molecule is what lets a coronavirus open a cell and get inside it. The resulting chimera would demonstrate whether the spike of SHC014 would attach to human cells. >>️

<< Just as when you trade in part of a poker hand for fresh cards, there was no way of knowing whether the final chimeras would be stronger or weaker. >>

<< If you study a hundred different bat viruses, your luck may run out. >> Ralph Baric. 

<< In 2014, the NIH awarded a five-year, $3.75 million grant to EcoHealth Alliance to study the risk that more bat-borne coronaviruses would emerge in China, using the same kind of techniques Baric had pioneered. Some of that work was to be subcontracted to the Wuhan Institute of Virology. >>

<< Consider this hypothetical scenario, (..) An important gain-of-function experiment involving a virus with serious pandemic potential is performed in a well-regulated, world-class laboratory by experienced investigators, but the information from the experiment is then used by another scientist who does not have the same training and facilities and is not subject to the same regulations. In an unlikely but conceivable turn of events, what if that scientist becomes infected with the virus, which leads to an outbreak and ultimately triggers a pandemic >>  Anthony Fauci (director of the NIH’s National Institute of Allergy and Infectious Diseases) (2012).
<< Paul’s grilling of Fauci brought new scrutiny to the relationship between Ralph Baric’s lab at UNC and Zhengli Shi’s at WIV, with some narratives painting Baric as the Sith master of SARS and Shi as his ascendant apprentice. They did share resources—for example, Baric sent the transgenic mice with human lung receptors to Wuhan.  >>
<< During a hearing on May 11, 2021, Senator Rand Paul confronted Anthony Fauci over funding of bat-virus research by the National Institutes of Health. >>️

<< The NIH has still not fully explained its decision-making and did not reply to questions. Citing a pending investigation, it has declined to release copies of the grant that sent the Wuhan institute about $600,000 between 2014 and 2019. It has also revealed little about its new system for assessing gain-of-function risks, which is carried out by an anonymous review panel whose deliberations are not made public. >>️
Rowan Jacobsen. Inside the risky bat-virus engineering that links America to Wuhan. China emulated US techniques to construct novel coronaviruses in unsafe conditions. MIT TechRev. Jun 29, 2021. 


Also

<< " ... e Da-Li' si sparse pell' aere un fantasmatico ente supersintetico supercompresso ... >> in: ️2153 - cracker tendenziali (around a matter-sucking maelstrom). Notes. Apr 4, 2008. (quasi-stochastic poetry)


<< in attesa del beffardo tsunami. >> in: 1619 - onda di carambola. Notes. Nov 29, 2004. (quasi-stochastic poetry).

keyword 'virus' in Notes (quasi-stochastic poetry)


keyword 'virus' in FonT 


keyword 'caos' | 'caotico' in Notes (quasi-stochastic poetry)



FonT

no surprise, no amazement here, I know chickens behaviors. 

<< Ricordo che quando si era ragazzi, negli anni sessanta, ... >> in: 2157 - il pino di takata matsubara. Apr 1, 2011. Notes. 








giovedì 1 aprile 2021

# behav: a case of extreme human-proto-bot love

TUKO.co.ke << has learnt Yuri Tolochko married his beautiful doll fiancee Margo in a traditional ceremony to mark their 18-month relationship. According to The Sun, the 'wedding' was official as it had a celebrant and a dozen of excited guests who could not keep calm after watching Yuri's romantic first dance with his doll. TUKO.co.ke accessed a video from the event which was posted on Instagram and it showed how stunning Yuri looked in his smart black dinner suit and bow tie, with his 'bride' rocking a lacy white wedding gown. >> 

Tuko. Yuri Tolochko: Bodybuilder marries doll after months of romance.


Magda Ibrahim. LOVE ISN'T DEAD. Bizarre moment bodybuilder MARRIES sex doll in creepy ceremony saying she’s a ‘tender soul inside’. Nov 25, 2020.


Hannah Frishberg. Bodybuilder proposes to sex doll after getting it plastic surgery. Dec10, 2019. 


Also

All things have a bit of soul. FonT. Apr 26, 2018.


Gabe Ibáñez. Autómata. Movie. (2014).





lunedì 25 gennaio 2021

# gst: apropos of the structure of natural codes, a RNA folding knot (origami-style) dance

 << Every second, a myriad of shapeless strands of RNA fold, origami-style, into intricate structures inside living cells. Now, for the first time, researchers can watch a data-driven video of this folding as RNA molecules are made by the cellular machinery. >> 

<< as the RNA strand grows, it twists, forming knot-like structures. But as more RNA building blocks are added to the strand, the knots unravel, allowing the molecule’s structure to emerge. >> 

Ground-breaking films show RNA’s complex curves take shape. Experimental data and predictive algorithms combine to reveal the essential biomolecule’s shape-shifting.
Nature. Jan 19, 2021. 


AA << model the folding of an RNA called SRP, an ancient RNA found in all kingdoms of life. The molecule is well-known for its signature hairpin shape. When watching the videos, the researchers discovered that the molecule ties itself into a knot and unties itself very quickly. Then it suddenly flips into the correct hairpin-like structure using an elegant folding pathway called toehold mediated strand displacement. >>

<< To the best of our knowledge, this has never been seen in nature, (..) We think the RNA has evolved to untie itself from knots because if knots persist, it can render the RNA nonfunctional. The structure is so essential to life that it had to evolve to find a way to get out of a knot. >> Julius Lucks. 

Amanda Morris. New Videos Show RNA as it's Never Been Seen. First-ever data-driven movies illuminate RNA's mysterious folding process.  McCormick School of Engineering. Jan 15, 2021.



Angela M Yu, Paul M. Gasper, et al. Computationally reconstructing cotranscriptional RNA folding from experimental data reveals rearrangement of non-native folding intermediates. Molecular Cell. doi: 10.1016/ j.molcel.2020.12.017
Jan 15, 2021. 




giovedì 10 settembre 2020

# gst: the dance (swimming and sinking behavior) of pelagic snails

<< Swimming and sinking behavior by pelagic snails is poorly studied but is important in their ecology, predator-prey interactions, and vertical distributions. >>

AA << focused on how the shell shape, body geometry, and body size affect their swimming behavior from a fluid mechanics perspective. In addition, ZooScan image analysis and metabarcoding of archived vertically stratified MOCNESS samples were used to relate swimming behaviors to night time and daytime vertical distributions. While different large scale swimming patterns were observed, all species exhibited small scale sawtooth swimming trajectories caused by reciprocal appendage flapping. Thecosome swimming and sinking behavior corresponded strongly with shell morphology and size, with the tiny coiled shell pteropods swimming and sinking the slowest, the large globular shelled pteropods swimming and sinking the fastest, and the medium-sized elongated shell pteropods swimming and sinking at intermediate speeds. However, the coiled shell species had the highest normalized swimming and sinking speeds, reaching swimming speeds of up to 45 body lengths s–1. The sinking trajectories of the coiled and elongated shell pteropods were nearly vertical, but globular shell pteropods use their hydrofoil-like shell to glide downwards at approximately 20° from the vertical, thus retarding their sinking rate. The swimming Reynolds number (Re) increased from the coiled shell species [Re ∼ O(10)] to the elongated shell species [Re ∼ O(100)] and again for the globular shell species [Re ∼ O(1000)], suggesting that more recent lineages increased in size and altered shell morphology to access greater lift-to-drag ratios available at higher Re. Swimming speed does not correlate with the vertical extent of migration, emphasizing that other factors, likely including light, temperature, and predator and prey fields, influence this ecologically important trait. Size does play a role in structuring the vertical habitat, with larger individuals tending to live deeper in the water column, while within a species, larger individuals have deeper migrations. >>

Ferhat Karakas, Jordan Wingate, et al. Swimming and Sinking Behavior of Warm Water Pelagic Snails. Front. Mar. Sci. doi: 10.3389/ fmars.2020.556239. Sep 7, 2020. 


<< And it's stunning to think that these sea butterflies are using the same fluid dynamics principles to fly through water that insects use to fly through air, >> David Murphy.

Poetry in motion: Engineers analyze the fluid physics of movement in marine snails. Frontiers. Sep 07, 2020


Also

<< Snails usually lumber along on their single fleshy foot; but not sea butterflies (Limacina helicina). These tiny marine molluscs gently flit around their Arctic water homes propelled by fleshy wings that protrude out of the shell opening. >>

These << snails swim using the same technique as flying insects, beating their wings in a figure-of-eight pattern,>>

Bizarre snail that swims like a flying insect. The Company of Biologists. Feb 17, 2016. 


David W. Murphy, Deepak Adhikari, et al. Underwater flight by the planktonic sea butterfly. Journal of Experimental Biology. 2016 219: 535-543. doi: 10.1242/jeb.129205. Feb 17, 2016.






sabato 4 aprile 2020

# life: 27 proteins to confine a world to a (complex 3D) virus dance

<< The novel coronavirus sweeping the globe packs 27 proteins, each adopting a unique, often incredibly complex 3D structure. 
Each protein is part of the molecular toolkit that the virus uses to infect, replicate, and spread. >>

Tom Rickey. Scientists Take Aim at the Coronavirus Toolkit. PNNL. Mar 31, 2020.

https://www.pnnl.gov/news-media/scientists-take-aim-coronavirus-toolkit

https://phys.org/news/2020-04-scientists-aim-coronavirus-toolkit.html

Also 

keyword 'dance' in FonT 

https://flashontrack.blogspot.com/search?q=dance

Also (quasi-stochastic poetry)

Catalisi d'astrattivo Tao. FonT.  Jan 22, 2005.

https://inkpi.blogspot.com/2005/01/1808-catalisi-dastrattivo-tao.html


sabato 10 agosto 2019

# behav: the sophisticated dance of the sulphur-crested cockatoo (Cacatua galerita eleonora)

<< Spontaneous movement to music occurs in every human culture and is a foundation of dance. This response to music is absent in most species (including monkeys), yet it occurs in parrots, perhaps because they (like humans, and unlike monkeys) are vocal learners whose brains contain strong auditory–motor connections, conferring sophisticated audiomotor processing abilities. >>

AA << report that a sulphur-crested cockatoo (Cacatua galerita eleonora) responds to music with remarkably diverse spontaneous movements employing a variety of body parts, and suggest why parrots share this response with humans.  >>

R. Joanne Jao Keehn, John R. Iversen, et al. Spontaneity and diversity of movement to music are not uniquely human. Current Biology. Volume 29, Issue 13, PR621-R622. doi: 10.1016/j.cub.2019.05.035. Jul 08, 2019.   https://www.cell.com/current-biology/fulltext/S0960-9822(19)30604-9  

Ed Yong. Not a Human, but a Dancer. What Snowball the parrot’s spontaneous moves teach us about ourselves. Jul 8, 2019   https://www.theatlantic.com/science/archive/2019/07/what-snowball-dancing-parrot-tells-us-about-dance/593428/   

Also

"Dance", in "Notes"

https://inkpi.blogspot.com/search?q=dance

"Dance", in "FonT"

https://flashontrack.blogspot.com/search?q=dance

mercoledì 24 luglio 2019

# gst: the intermittent dance of liquid droplets

<< Liquid droplets bouncing on a vibrating liquid surface can execute a surprising cycle, alternating between moving and standing still. >>

Focus: Video—Stop and Go Droplets.
July 12, 2019• Physics 12, 80.    https://physics.aps.org/articles/v12/80    

Rahil N. Valani, Anja C. Slim, and Tapio Simula. Superwalking Droplets.
Phys. Rev. Lett. 123, 024503 – Published 12 July 2019.   https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.024503  

Also

"droplets". In FonT.   https://flashontrack.blogspot.com/search?q=droplets

venerdì 11 maggio 2018

# gst: the dance of complex knots (in DNA), from mobile to jammed states

AA << show for the first time experimentally that knots can go from a mobile to a jammed state by varying an applied strain rate, and that this jamming is reversible >>

Alexander R. Klotz, Beatrice W. Soh, and Patrick S. Doyle. Motion of Knots in DNA Stretched by Elongational Fields.  Phys. Rev. Lett. 120, 188003. May 3, 2018.

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.188003

Anne Trafton. Chemical engineers discover how to control knots that form in DNA molecules. Massachusetts Institute of Technology. May 3, 2018.

https://m.phys.org/news/2018-05-chemical-dna-molecules.html

martedì 6 febbraio 2018

# web: about ghostly followers: the real Jessica

<< The real Jessica [..] is a Minnesota teenager with a broad smile and wavy hair. [..] But on Twitter, there is a version of Jessica that none of her friends or family would recognize. >>

<< The accounts that most resemble real people [..] reveal a kind of large-scale social identity theft. At least 55,000 of the accounts use the names, profile pictures, hometowns and other personal details of real Twitter users, including minors, according to a Times data analysis. >>

<< By some calculations, as many as 48 million of Twitter’s reported active users - nearly 15 percent - are automated accounts designed to simulate real people, though the company claims that number is far lower. >>

Nicholas Confessore, Gabriel JX  Dance, Richard Harris, Mark Hansen.  The Follower Factory. Jan 27, 2018.

https://www.nytimes.com/interactive/2018/01/27/technology/social-media-bots.html

<< A big chunk of those "likes," "retweets," and "followers" lighting up your Twitter account may not be coming from human hands. According to new research from the University of Southern California and Indiana University, up to 15 percent of Twitter accounts are in fact bots rather than people. >>

Michael Newberg. As many as 48 million Twitter accounts aren't people, says study. March 10, 2017.

https://www.cnbc.com/2017/03/10/nearly-48-million-twitter-accounts-could-be-bots-says-study.html

Onur Varol, Emilio Ferrara, et a. Online Human-Bot Interactions: Detection, Estimation, and Characterization. arXiv: 1703.03107.v2 Mar 27, 2017.

https://arxiv.org/pdf/1703.03107.pdf

Allie Nicodemo. Why buy social bots? For 'illusion of popularity,' researcher says. Jan 30, 2018

https://m.phys.org/news/2018-01-social-bots-illusion-popularity.html

lunedì 5 giugno 2017

# s-chem: solar fuels, a catalytic "dance" to drive

AA << have identified a rapid electronic process that could aid the water-splitting reaction in cobalt-containing catalysts. Cobalt catalysts are relatively inexpensive and could replace more expensive precious metal catalysts in the production of clean energy, most notably solar fuels >>

Chemical "dance" of cobalt catalysis could  pave way to solar fuels. June  3,  2017

https://m.phys.org/news/2017-06-chemical-cobalt-catalysis-pave-solar.html

Casey N. Brodsky, Ryan  G. Hadt, et al. In situ characterization of cofacial Co(IV) centers in CoO cubane: modeling the high-valent active site in oxygen-evolving catalysts.  PNAS (2017) vol. 114 no. 15  pp. 3855–3860 doi: 10.1073/pnas.1701816114

http://m.pnas.org/content/114/15/3855

domenica 11 dicembre 2016

# s-dance: actually, they don't write ...

<< “If people in the literary world groan,” Mr. Engdahl (Horace Engdahl) added, “one must remind them that the gods don’t write, they dance and they sing.” >>

Joe Coscarelli. Bob Dylan Sends Warm Words but Skips Nobel Prize Ceremonies. Dec. 10, 2016.

http://mobile.nytimes.com/2016/12/10/arts/bob-dylan-skips-nobel-prize-ceremonies.html

martedì 1 novembre 2016

# s-behav: the intricate performance (dancing and singing) of a jumping spider

AA << present behavioral and neurophysiological evidence that [Jumping spiders (Salticidae)]  perceive and respond to airborne acoustic stimuli, even when the distance between the animal and the sound source is relatively large (∼3 m) and with stimulus amplitudes at the position of the spider of ∼65 dB sound pressure level (SPL) >>

<< Behavioral experiments with the jumping spider Phidippus audax reveal that these animals respond to low-frequency sounds (80 Hz; 65 dB SPL) by freezing—a common anti-predatory behavior characteristic of an acoustic startle response >>

<< Neurophysiological recordings from auditory-sensitive neural units in the brains of these jumping spiders showed responses to low-frequency tones (80 Hz at ∼65 dB SPL)—recordings that also represent the first record of acoustically responsive neural units in the jumping spider brain.  Responses persisted even when the distances between spider and stimulus source exceeded 3 m and under anechoic conditions. >>

Paul S. Shamble, Gil Menda, et al.
Airborne Acoustic Perception by a Jumping Spider. Current Biology. DOI: 10.1016/j.cub.2016.08.041 Publ. Oct. 13, 2016

http://www.cell.com/current-biology/fulltext/S0960-9822(16)30985-X

Jaymi Heimbuch. Jumping spider males dance and sing ... Oct. 4, 2016.

http://www.mnn.com/earth-matters/animals/stories/jumping-spider-males-dance-and-sing-yes-sing-woo-their-mates

FonT: sarebbe interessante valutare se e quanto tempo prima la struttura neuroacustica del Phidippus audax sia in grado di percepire e discriminare le basse freq dei movimenti  tellurici profondi che successivamente manifesteranno  macro episodi di superficie (earthquake).

also:

Richard A. Lovett. Scientists Seek Foolproof Signal to Predict Earthquakes. National Geographic News. Jan. 5, 2013

http://news.nationalgeographic.com/news/2013/01/04-earthquakees-defy-prediction-efforts/

Vanessa Bates Ramirez. Earthquakes Will Be as Predictable as Hurricanes Thanks to AI. Sep 27, 2016

http://singularityhub.com/2016/09/27/earthquakes-will-be-as-predictable-as-hurricanes-thanks-to-ai