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domenica 15 maggio 2016

# s-gene: extensive, quantitative perturbation approach to trace "the poetry" of gene regulatory networks

<<  DNA  content  of  our  genomes  resembles  a  complex  biological  languagecomposed  of  coding  regions and  regulatory  regionsAlthough  protein-coding  regions  in  DNA  could  be  compared  to  a  traffic  signal  –  utilizing  a  simple  stop  or  go  message  –  the regulatory  regions  in  DNA  are  more  like  poetry. “The  regulatory  sites  in  DNA  operate  like  a  light  switch  to  turn  a  gene  on  and  off.  In  animalsit’s  extremely  complex,”  said  David  Arnosti (..) “There  might  be  hundreds  of  protein  factors  in  the  cell  that  bind  to  the gene  and  impact  activity.  And  there  might  be  hundreds  of  binding  places.” He  compares  the  “language”  used  in  these  regulatory  sites  to  poetry. “It  may  be  Emily  Dickinson,  or  Shakespeare  or  Allen  Ginsberg;  but  all  are  using  ‘words’  to  evoke  thoughts  and  emotionsto  control  the  message” >>

Val  Osowski, Layne  Cameron. DO GENES EXPRESS THEMSELVES THROUGH POETRY? A  new study  from  Michigan  State  University  makes  inroads  in  learning  to  “read”  the  genome,  a  key  goal  of  modern  biology. Published:  May  9,  2016

http://msutoday.msu.edu/news/2016/do-genes-express-themselves-through-poetry/

To  understand  transcription  factor  interactions  on  enhancers  << (..) an  extensive,  quantitative  perturbation  analysis targeting  the  dorsal-ventral  patterning  gene  regulatory  network  (GRNcontrolled  by  Drosophila NF-κB  homolog  Dorsal [was used to test] the effects  of  cooperativityrepression,  and factor  potency >>

Rupinder  Sayal,  Jacqueline  M  Dresch, et al. Quantitative  perturbation-based  analysis  of  gene expression  predicts  enhancer  activity  in  early Drosophila  embryo. eLife  2016;5:e08445. Published  May  6,  2016

http://dx.doi.org/10.7554/eLife.08445

sabato 14 maggio 2016

# s-behav: the beetle Carabaeus lamarcki, dancer and sky analyzer

<< beetles  use  the  light  of  the  Milky  Way  to  navigate  in  the  world >>

<< when  the  beetles  dance  on  top  of  a  ball  of dungthey  simultaneously  take  a  photograph  -  a  snapshot  -  of  how  celestial  bodies  are  positioned. Then  they  know  where  they  are  going  and  roll  off  with  their  ball  of  dung  in  a  straight  line  across  the savannah >>

When dung beetles dance, they photograph the firmament. Lund  University, 12 May 2016.

http://www.alphagalileo.org/ViewItem.aspx?ItemId=164092&CultureCode=en

<< This is a dung beetle (Carabaeus lamarcki) dancing on top of its ball while reading the sky >> image, caption.

https://www.sciencedaily.com/releases/2016/05/160512125422.htm

Basil el Jundi, James J. Foster, et al. Snapshot-Based  Mechanism  for Celestial  Orientation. Current  Biology, 2016, in press.

http://dx.doi.org/10.1016/j.cub.2016.03.030

FonT: l'immagine della blatta sulla sua pallina di sterco che danza e contemporaneamente, attraverso la danza, fotografa la volta celeste per orientarsi e' davvero suggestiva, poetica; mi ricorda un'altra immagine:

<< ... trasformati in uno scarabeo stercorario gigante >>

di Salman Rushdie ("I romanzi e la vita [..] Il mito di Proteo". La Rep., 16/06/2006, pp. 48-9) dalla quale avevo composto una breve rima (quasistocastica):

2022 - si risvegliano stercorari
Saturday, June 17, 2006

http://inkpi.blogspot.it/2006/06/2022-si-risvegliano-stercorari.html

venerdì 13 maggio 2016

# s-brain: everyday decisions inside small brain clusters

<< Choosing  what  shirt  to  buywhat  to  order  for  lunch  or  whether  to  go  with  the  hearty  red  wine  or  the  lighter white  all  involve  assigning  values  to  the  options.  A  small  brain  structure  plays  a  central  role  in  the  many  decisions  like this  we  make  each  day. >>

<< (..) some  of  the  neurons  in  the  orbitofrontal  cortex  (OFC)  assign  value  to  the  options, while  other  neurons  are  related  to  making  final  choicesAll  of  these  neurons  can  re-map  to  make  different  decisions when  circumstances  change. >>

<< “If  we  look  at  individual  cellsneurons  are  very  flexible,”  said  Padoa-Schioppa“Howeverif  we  consider  the  whole network,  the  decision  circuit  is  remarkably  stableThis  combination  of  circuit  stability  and  neuronal  flexibility  makes  it possible  for  the  same  brain  region  to  generate  decisions  between  any  two  goods.” >>

Small Brain  Area  Plays  Key  Role  in  Making  Everyday  Decisions. 9-May-2016  12:05  PM  EDT

http://www.newswise.com/articles/small-brain-area-plays-key-role-in-making-everyday-decisions

Jue  Xie,  Camillo  Padoa-Schioppa. Neuronal  remapping  and  circuit  persistence  in economic  decisions. Nature  Neuroscience   (2016)   doi:10.1038/nn.4300. Published  online  09  May  2016.

http://dx.doi.org/10.1038/nn.4300

giovedì 12 maggio 2016

# s-esobio: no Wow! traces around Tabby's star

<< Sorry, E.T. lovers, but the results of a new study make it far less likely that KIC 8462852, popularly known as Tabby's star, is the home of industrious aliens who are gradually enclosing it in a vast shell called a Dyson sphere. >>

ScienceDaily, 9 May 2016.

https://www.sciencedaily.com/releases/2016/05/160509153708.htm

http://news.vanderbilt.edu/2016/05/new-study-supports-natural-causes-not-alien-activity-explain-mystery-stars-behavior/

Michael Hippke, Daniel Angerhausen, et al.  A statistical analysis of the accuracy of the digitized magnitudes of photometric plates on the time scale of decades with an application to the century-long light curve of KIC 8462852. Astrophysical Journal, May 2016. preprint: arXiv:1601.07314 [astro-ph.EP]

https://arxiv.org/abs/1601.07314

more:

https://en.m.wikipedia.org/wiki/Wow!_signal

https://en.m.wikipedia.org/wiki/Dyson_sphere

martedì 10 maggio 2016

# s-evol: strange seaweed

<< “People  have  always  assumed  that within  the  green-plant  lineageall  the  early  branches  were  unicellular,”  says Frederik  Leliaert,  an  evolutionary  biologist  at  Ghent  University  in  Belgium“It  is  quite  surprising  that  among those,  a  macroscopic  seaweed  pops  up.” >>

Emma  Marris. Strange  seaweed  rewrites  history  of  green  plants. Ancient  alga  developed  large  size  and  complex  structure  independently  of  other  plants. 09  May  2016.

http://www.nature.com/news/strange-seaweed-rewrites-history-of-green-plants-1.19863?WT.mc_id=TWT_NatureNews

Frederik Leliaert,  Ana Tronholm, et al. Chloroplast phylogenomic analyses revealthe deepest-branching lineage of the Chlorophyta, Palmophyllophyceae class.nov. Scientific Reports 6, Article number: 25367 (2016) doi:10.1038/srep25367. 09  May 2016

http://www.nature.com/articles/srep25367

lunedì 9 maggio 2016

# n-behav: #POTUS race: the three steps of reaction

<< The Late Show team also had a surprise for viewers ... >>

<< At the top of his show, Colbert also illustrated how most people reacted to Trump's presidential candidacy: laughing at his initial announcement, drinking heavily after news of his big primary wins and laughing maniacally when Trump became the presumptive GOP nominee. >>

Hilary Lewis. Cartoon Donald Trump, Stephen Colbert Deliver 'Hunger Games'-Inspired Farewell to Ted Cruz, John Kasich. 9:44 AM PDT 5/5/2016

http://www.hollywoodreporter.com/news/stephen-colberts-hungry-power-games-890957

sabato 7 maggio 2016

# s-evol: a radical reassessment of feeding behavior

<< In  2014,  scientists  discovered  a  bizarre  fossil—a  crocodile-sized  sea-dwelling  reptile [Atopodenatus  unicus] that  lived 242  million  years  ago  in  what  today  is  southern  China.>>

<< "It's  a  very  strange  animal,"  says  Olivier  RieppelRowe  Family  Curator  of  Evolutionary  Biology at  The  Field  Museum  in  Chicago.  "It's  got  a  hammerheadwhich  is  uniqueit's  the  first  time we've  seen  a  reptile  like  this."  >>

'Hammerhead'  creature  was  world's  first  planteating  marine  reptile. May  6,  2016.

http://m.phys.org/news/2016-05-hammerhead-creature-world-plant-eating-marine.html

<< The evidence  indicates  a  novel  feeding  mechanism  wherein  the  chisel-shaped  teeth were  used  to  scrape  algae  off  the  substrate,  and  the  plant  matter  that  was  loosened  was filtered  from  the  water  column  through  the  more  posteriorly  positioned  tooth  meshThis  is the  oldest  record  of  herbivory  within  marine  reptiles.>>

Li  Chun ,  Olivier  Rieppel , et al.  The  earliest  herbivorous  marine  reptile  and  its  remarkable  jaw apparatus. Science  Advances    06 May 2016: Vol.  2,  no.  5,  e1501659 DOI:  10.1126/sciadv.1501659

http://advances.sciencemag.org/content/2/5/e1501659