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Message par Invité Ven 31 Déc 2021 - 11:53

Mort de rire

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Message par Topsy Turvy Lun 10 Jan 2022 - 10:22

Le bon vieux temps, quand on dormait en deux phases, tous ensemble, avec des bestioles,... :
The forgotten medieval habit of 'two sleeps'
By Zaria Gorvett
10th January 2022
For millennia, people slept in two shifts – once in the evening, and once in the morning. But why? And how did the habit disappear?
[...]
https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep
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Message par Topsy Turvy Ven 14 Jan 2022 - 7:59

Plutôt culture et littérature, mais aussi sci-fi et art de vivre, hopepunk contre grimdark :
The sci-fi genre offering radical hope for living better
By David Robson
14th January 2022
In these times of cynicism and despair, is 'hopepunk' the perfect antidote? David Robson explores radical optimism, and why it matters.
[...]
https://www.bbc.com/culture/article/20220113-the-sci-fi-genre-offering-radical-hope-for-living-better
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Message par Topsy Turvy Dim 16 Jan 2022 - 9:59

Lab News [original papers] - Page 2 Missticcopie

Autour de la récente xénogreffe de coeur de porc OGM :

Man who had pig heart transplant was guilty of 1988 stabbing
past crimes do not disqualify patients from getting such procedures
https://www.bbc.com/news/world-us-canada-60010155

Three ethical issues around pig heart transplants
[medical implications, animal rights, religion]
https://www.bbc.com/news/world-59951264
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Message par Topsy Turvy Dim 16 Jan 2022 - 12:08

Spent 2 Hours Looking For This At The Natural History Museum (London):
Totally Worth It


Lab News [original papers] - Page 2 61cec43b5be04_RTZCF__700
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Message par Topsy Turvy Lun 17 Jan 2022 - 8:43

Coming tonight, ça m'a fait marrer, mais j'ai un humour de m, oui, je sais...

Retour aux questions éthiques, ici autour du marché du rein (transcription dispo à droite) :
https://www.bbc.co.uk/ideas/videos/should-human-kidneys-be-bought-and-sold/p0bgz6yf
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Message par Topsy Turvy Lun 17 Jan 2022 - 15:03


Science Friction: A Documentary from Skeptoid Media
about scientists who get misrepresented by the media.
https://sciencefriction.tv
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Message par Topsy Turvy Jeu 20 Jan 2022 - 14:06

Editorial de Nature :
The ‘war on cancer’ isn’t yet won
Nature 601, 297 (2022)
https://doi.org/10.1038/d41586-022-00109-3
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Message par Topsy Turvy Ven 21 Jan 2022 - 10:04

Le monde est fou...

après le violon végan :
'World first' vegan violin created using berries and pears in Malvern
https://www.bbc.com/news/uk-england-hereford-worcester-60041471

la course à l'oeuf végan (Zaria Gorvett, youhouu) :
The race to make a multipurpose vegan egg
https://www.bbc.com/future/article/20220120-the-race-to-make-a-multipurpose-vegan-egg
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Message par RonaldMcDonald Ven 21 Jan 2022 - 10:23

Une mauvaise idée, parfois, c'est juste une bonne idée poussée un peu trop loin. La bonne idée, c'est qu'on mange trop de viande. 8000£ le violon, quand l'équivalent fait avec des matériaux traditionnels doit en couter 600... on a encore de la marge.
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Message par Topsy Turvy Ven 21 Jan 2022 - 11:59

Une autre bonne idée qui pourrait devenir catastrophique si poussée trop loin :
False banana: Is Ethiopia's enset 'wondercrop' for climate change?
Scientists say the plant enset, an Ethiopian staple, could be a new superfood and a lifesaver in the face of climate change.

The banana-like crop has the potential to feed more than 100 million people in a warming world, according to a new study.

The plant is almost unknown outside of Ethiopia, where it is used to make porridge and bread.

Research suggests the crop can be grown over a much larger range in Africa.

"This is a crop that can play a really important role in addressing food security and sustainable development," said Dr Wendawek Abebe of Hawassa University in Awasa, Ethiopia.
[...]
https://www.bbc.com/news/science-environment-60074407
Banane à gauche, enset à droite :
Lab News [original papers] - Page 2 _122919972_ensetandbanana22
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Message par Topsy Turvy Ven 21 Jan 2022 - 18:21

35 Scientists Share That “One Science Fact” They Wish The Whole World Would Know
https://www.boredpanda.com/interesting-facts-my-one-science-tweet/

Un exemple [je propose de corriger you're ou c'est trop risqué ? ^^] :

Lab News [original papers] - Page 2 Interesting-facts-my-one-science-tweet-12-61e93b6847ca8__700
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Message par Topsy Turvy Mer 26 Jan 2022 - 17:49

Shocked

https://www.bbc.com/future/article/20220125-how-humans-are-changing-evolution


Living Robot Swarms
A cellular platform for the development of synthetic living machines.
https://livingrobotswarms.github.io/
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Message par Topsy Turvy Jeu 27 Jan 2022 - 17:33

Soap opera chez les procaryotes :
Microbial defenses against mobile genetic elements and viruses: Who defends whom from what?
Eduardo P. C. Rocha & David Bikard
Published: January 13, 2022
https://doi.org/10.1371/journal.pbio.3001514

J'aime bien la figure 2 en particulier :
https://journals.plos.org/plosbiology/article/figure?id=10.1371/journal.pbio.3001514.g002
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Message par Topsy Turvy Ven 28 Jan 2022 - 10:13

Welcome to the OneZoom tree of life explorer...
An interactive map of the evolutionary links between all living things known to science. Discover your favourites, see which species are under threat, and be amazed by the diversity of life on earth.
[...]
https://www.onezoom.org
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Message par Topsy Turvy Mer 2 Fév 2022 - 17:13

Steve Gschmeissner [age 71] is one of the world’s leading scanning electron microscopists. Meet a highly skilled professional using a wonderfully realistic microscopic technique. His coverage of the microscopic world is comprehensive and wide ranging, including bacteria, human and animal tissues such as blood, nerves, bone and hair cells, pests, parasites and pond life, electronic circuitry and nanotechnology. His greatest contribution is an unrivalled collection of difficult to access cancer cells. SPL is the exclusive representative of his collection. We are proud to share the news that our contributor, scanning electron microscopist Stephen Gschmeissner, has been awarded the prestigious 2021 Lennart Nilsson Award.
https://stories.sciencephoto.com/portfolio/lennart-nilsson-award-2021/
https://stories.sciencephoto.com/portfolio/steve-gschmeissner/
https://www.sciencephoto.com/set/3657/steve-gschmeissner-finding-the-unexpected
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Message par Topsy Turvy Mar 8 Fév 2022 - 17:07

Le CH4, 25-30 fois plus effet de serrant que le CO2, libéré par suite du réchauffement...
Chaud devant !

Gros titre et quelques illustrations :
Scientists raise alarm over ‘dangerously fast’ growth in atmospheric methane
As global methane concentrations soar over 1,900 parts per billion, some researchers fear that global warming itself is behind the rapid rise.

Lab News [original papers] - Page 2 D41586-022-00312-2_20096438

Lab News [original papers] - Page 2 D41586-022-00312-2_20096434

Lab News [original papers] - Page 2 D41586-022-00312-2_20096436

https://doi.org/10.1038/d41586-022-00312-2
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Message par Topsy Turvy Mer 9 Fév 2022 - 9:31

Les infographies Nature de la semaines sont sympas, j'y joins une illustration BBC sur les globules blancs :

Lab News [original papers] - Page 2 D41586-022-00374-2_20112024
https://doi.org/10.1038/d41586-022-00374-2

[...]
Lab News [original papers] - Page 2 _123064777_cells
Monocytes - type of white blood cell that can transform into macrophage or dendritic cell
Macrophages - devour dead cells and living enemies, coordinate defences and heal wounds
Mast cells - filled with tiny bombs that containing potent chemicals that cause local inflammation
Dendritic cells - like an intelligence officer, it gathers samples from dead intruders
Natural killer cells - hunt two types of enemies: cells infected by viruses and cancer cells
Neutrophils - all-purpose weapons system engineered to quickly deal with enemies especially bacteria
Eosinophil - causes inflammation, battles parasites, activates other cells
Basophil - like mast cells and eosinophils, they prolong an allergic reaction
T cells - they do many things including orchestrating other cells and killing cancer cells
B cells - produce antibodies and activate other cells
[...]
https://www.bbc.com/news/health-60171592

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Lab News [original papers] - Page 2 D41586-022-00374-2_20112026
What the Omicron wave is revealing about human immunity
Cassandra Willyard
Nature 602, 22-25 (2022)
https://doi.org/10.1038/d41586-022-00214-3
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Message par Topsy Turvy Mer 9 Fév 2022 - 18:37

Nature encore, sur le problème de la pollution de l'eau, titre et quelques illustrations :

The urine revolution: how recycling pee could help to save the world
Separating urine from the rest of sewage could mitigate some difficult environmental problems, but there are big obstacles to radically re-engineering one of the most basic aspects of life.
Chelsea Wald

Lab News [original papers] - Page 2 D41586-022-00338-6_20107532

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Nature 602, 202-206 (2022)
https://doi.org/10.1038/d41586-022-00338-6

Au passage, il y a eu un Entendez-vous l'éco ? sur les toilettes, semaine passée :
https://www.franceculture.fr/emissions/entendez-vous-l-eco/tirez-la-chasse
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Message par Topsy Turvy Lun 14 Fév 2022 - 12:49

C'est surtout le poème qui me plaît, mais la cladification est sympa aussi :
The Head and the Heart

The head is stately, calm, and wise,
And bears a princely part;
And down below in secret lies
The warm, impulsive heart.
[...]
Yet each is best when both unite
To make the man complete;
What were the heat without the light?
The light, without the heat?

— John Godfrey Saxe, 1898
https://www.poetrynook.com/poem/head-and-heart
An ancient link between heart and head — as seen in the blobby, headless sea squirt
The vital connection between body parts provides insight into the evolution of vertebrates’ closest kin.
Amy Maxmen
[...]
Lab News [original papers] - Page 2 D41586-022-00413-y_20125118
[...]
Nature 602, 380-382 (2022)
https://doi.org/10.1038/d41586-022-00413-y
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Message par Topsy Turvy Mer 16 Fév 2022 - 14:48

Entre sciences de la vie et de la Terre : The animals that detect disasters.
https://www.bbc.com/future/article/20220211-the-animals-that-predict-disasters
Sur des études de comportements et de marqueurs physico-chimiques, je trouve sympa.
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Message par fift Mer 16 Fév 2022 - 15:25

Je partage aussi ceci ici, même si ce n'est pas un "papier" officiel : certaines plantes réagiraient à des séquences sonores (d'où l'intérêt de leur parler Laughing). Le truc est sérieux, ça m'a été transmis par un contact de la fac de Cergy :
https://www.leparisien.fr/val-d-oise-95/a-neuville-sur-oise-les-scientifiques-soignent-les-plantes-par-la-musique-02-03-2018-7587423.php

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Message par Nefelibata Mer 16 Fév 2022 - 15:37

Dans le même genre, j'avais lu que les plantes/certaines plantes pourraient crier en cas de stress, et communiquer par exemple avec les insectes:

https://www.geo.fr/environnement/face-au-stress-certaines-plantes-se-mettraient-a-crier-198959
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Message par Topsy Turvy Ven 18 Fév 2022 - 14:25

Inattendu. La brusque purification de l'air comme facteur contributif (complexe) d'inondations en Chine à l'été 2020.
Abrupt emissions reductions during COVID-19 contributed to record summer rainfall in China
Abstract
[...] [we] show that the abrupt emissions reductions during the pandemic strengthened the summer atmospheric convection over eastern China, resulting in a positive sea level pressure anomaly over northwestern Pacific Ocean. The latter enhanced moisture convergence to eastern China and further intensified rainfall in that region. Modeling experiments show that the reduction in aerosols had a stronger impact on precipitation than the decrease of greenhouse gases did. We conclude that through abrupt emissions reductions, the COVID-19 pandemic contributed importantly to the 2020 extreme summer rainfall in eastern China.
Lab News [original papers] - Page 2 41467_2022_28537_Fig1_HTML
Fig. 1: Extreme precipitation in China contributed by emissions reductions during COVID-19.

Yang, Y., Ren, L., Wu, M. et al. Abrupt emissions reductions during COVID-19 contributed to record summer rainfall in China. Nat Commun 13, 959 (2022). https://doi.org/10.1038/s41467-022-28537-9
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Message par Topsy Turvy Sam 19 Fév 2022 - 11:24

Intéressant. Dans la série quand qu'on sera combien trop où, je n'avais pas vu ces estimations détaillées (publication 2020) :

Fertility, mortality, migration, and population scenarios for 195 countries and territories from 2017 to 2100: a forecasting analysis for the Global Burden of Disease Study
Stein Emil Vollset et al.
The Lancet, vol 396, n 10258, p1285-1306, 17.10.2020
https://doi.org/10.1016/S0140-6736(20)30677-2

Quelques illustrations :

Vous connaissez ce livre de Peter Spier, sorti en 1980, dont l'édition française met un nombre en titre ?
Il y a des mises à jour des données dans toutes les langues, mais la version française est marrante.

Lab News [original papers] - Page 2 En_people__9780385244695_2  Lab News [original papers] - Page 2 De_menschen_9783522434850  Lab News [original papers] - Page 2 Es_gente_9788426436047_2  Lab News [original papers] - Page 2 Zh_simp_ren_9787221079954

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Message par Topsy Turvy Lun 7 Mar 2022 - 12:38

Sur les conceptions d'esprit, de conscience, etc., critique de livre pas que positive mais intéressante :
Journey of the Mind: How Thinking Emerged from Chaos
Ogi Ogas and Sai Gaddam
W. W. Norton & Company (2022)
A tour of the evolution of minds
Philip Ball
An informative guide takes in archaea, birds, primates and more — overconfidently.
[...]
The book offers an admirable survey of how minds might comprise modules that control simple operations, which are combined to solve complex problems of survival. For instance, a bacterium can move towards food sources thanks to motor systems that switch between directional swimming and random tumbling, depending on how it senses nutrient concentrations changing in its environment. In this way, a spatial problem acquires a temporal solution — how does the situation now compare with a moment ago? — and the microbe acquires a memory of sorts.

A rat finding food in a maze breaks down a visual scene into component features of edges, foreground and so on. And there’s more: the rat mind holds a complex internal representation of the world against which to compare sensory input; it is constantly checking this inner map. The authors lean here towards the ‘free-energy minimization’ model proposed by neuroscientist Karl Friston and others, in which organisms strive to shrink the mismatch between expectation and experience.

Ogas and Gaddam take a very broad view of mind as “a physical system that converts sensations into action”. At face value, this grants a mind to thermostats and robots as much as to living entities. “A mind responds. A mind transforms. A mind acts,” they write. But the same is true of many machines. What, then, distinguishes a mind? If it’s sentience or awareness, the authors give a confusing picture. They say the “self-awareness” of an amoeba is “piddling” — and later seem to deny this quality to all organisms except vertebrates.

[...] Since the late 1960s, Grossberg has developed the idea that consciousness arises from ‘resonance’ between specific modules of the brain. Ogas and Gaddam are vague about what resonance means here, beyond saying that the modules amplify and prolong each other’s outputs, and they give the reader little indication of what empirical evidence exists to support the idea. Grossberg’s theory is provocative and stimulating, but, couched in the abstract mathematical framework of dynamical systems theory, it remains contingent on his supposition that “all conscious states are resonant states”. I’m not convinced it amounts to the revolution that the authors assert.

There are many other proposals for what consciousness is and how it arises. Better-known is global workspace theory, championed in the past three decades by Bernard Baars, Stanislas Dehaene and others. They present consciousness as a phenomenon of information exchange in the brain, positing that awareness simply ‘ignites’ once certain criteria in the interaction of brain circuits are satisfied. Their corollary is that this would apply to any information-processing circuits with the correct architecture. Others, including neuroscientist Anil Seth, suspect that consciousness might be supported by only certain kinds of entities — as far as we know right now, ones that are alive. Ogas and Gaddam jump the gun, in my view, when they suggest that Grossberg has all the answers.

There are other instances in which they present contentious ideas with certainty. For all of the minds they discuss, much remains open. They write that birds didn’t develop language “because they don’t have hands”, but in fact it’s still debated whether gestures helped lead to the origin of language. They state that insects have no consciousness, when there is good reason to suppose that bees, at least, have many of the mental attributes associated with consciousness, such as foresight and the ability to imagine. Even bacteria are not the simple automata portrayed here; other researchers describe bacterial behaviours in the language of cognition.

The structure of a progression from the seemingly simple minds of bacteria and amoebas to the complex ones of primates makes narrative sense, but recalls the outdated image of evolution with humans at the apex. Our minds do excel in certain respects, most obviously in developing language and complex culture — but in dexterity, vision, navigation and more, other species eclipse us. There is more than a hint that evolution is striving to a particular end in Ogas and Gaddam’s suggestion that, once early single-celled organisms acquired the ability to sense and move, “the royal road to consciousness beckoned”.
[...]
There is plenty to like in Journey of the Mind. It is so often informative and entertaining that it feels mean to cavil. But the book exemplifies a persistent problem in popular science, in which pet theories are presented with too much confidence and too little context. Readers deserve the full picture — less definitive and satisfying, perhaps, but ultimately more honest and illuminating.

Nature 603, 221-222 (2022)
https://doi.org/10.1038/d41586-022-00652-z
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Message par Topsy Turvy Mer 9 Mar 2022 - 9:07

Youhouu ! Le bateau de Shackleton, pris dans les glaces avant de sombrer en 1915, a été retrouvé.

"It is upright, well proud on the seabed, intact, and in a brilliant state of preservation."

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https://www.bbc.com/news/science-environment-60662541

https://endurance22.org/endurance-is-found
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Message par Topsy Turvy Sam 12 Mar 2022 - 16:45

Compromis entre stabilité et maniabilité dans le vol des oiseaux :

Birds can transition between stable and unstable states via wing morphing
Harvey, C., Baliga, V.B., Wong, J.C.M. et al.
Nature (2022)
https://doi.org/10.1038/s41586-022-04477-8

J'aime bien les illustrations, avec parmi les pas trop trop techniques :

Fig. 3: Wing morphing, specifically driven by the elbow, has a strong effect on roll and yaw inertia components :
Lab News [original papers] - Page 2 41586_2022_4477_Fig3_HTML

Le faisan de Lady Amherst, il a de la gueule et une sacrée traine :
Lab News [original papers] - Page 2 Chrysolophus_amherstiae_18092009
https://fr.wikipedia.org/wiki/Faisan_de_Lady_Amherst

Fig. 4: Evolution selects for both pitch stability and instability, but modern birds exhibit highly variable pitch agility and stability characteristics :
Lab News [original papers] - Page 2 41586_2022_4477_Fig4_HTML

Leach's Storm-petrels (Hydrobates leucorhous) filmed at New Brighton, Wirral, UK, on 13th September 2017 with a Nikon CoolPix P900 :
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Message par RonaldMcDonald Sam 12 Mar 2022 - 23:20

'me fait penser aux avions. Les avions modernes sont de vrais fers à repasser, tu coupes l'ordinateur de bord, et ça plonge droit vers le sol. Le pilote ne peut rien faire, les vraies manœuvres de l'avion n'ont rien à voir avec l'instinct. le plus marquant est le F-117, mais en fait, les Airbus et Boeing de dernière génération sont super instables aussi (et quand le logiciel ne suffit pas, ça fait boum, cf. les crash du Boeing MAX)

Les oiseaux sont quand même des "conceptions" (par essais erreur naturels à l'aveugle total) impressionnantes. Dans le temps, on faisait des avions à géométrie variable (B1, F14...) mais on a laissé tomber, les couts de maintenance étaient délirants. Les oiseaux n'ont pas ce genre de problèmes, on dirait.
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Message par Topsy Turvy Mer 16 Mar 2022 - 16:30

Quand les tests par essais et erreurs ne permettent pas "trop" d'erreurs :
The paradox of how antidepressants are tested
By Andy Extance, 16th March 2022
Mental health has never been so important, yet antidepressant drug trials typically exclude those who need help most. Now regulators and some researchers are asking if there needs to be a change in how these drugs are tested.
[...]
https://www.bbc.com/future/article/20220315-the-paradox-of-how-antidepressants-are-tested
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Message par Topsy Turvy Ven 18 Mar 2022 - 10:15

Beauty and wonder of science boosts researchers’ well-being

Lab News [original papers] - Page 2 D41586-022-00762-8_20224406
Coloured scanning electron micrograph of Ectopleura larynx, a sea creature related to jellyfish. Biologists reported seeing beauty in complexity and pleasing colours or shapes. Credit: Jannicke Wiik-Nielsen/Science Photo Library

Scientists’ ability to experience wonder, awe and beauty in their work is associated with higher levels of job satisfaction and better mental health, finds an international survey of researchers.
[...]
Lab News [original papers] - Page 2 D41586-022-00762-8_20227966
[...]
The survey found that, overall, scientists reported moderately high levels of well-being, with 72% saying they were mostly or completely satisfied with their jobs. But there were significant disparities. Women reported higher levels of burnout than men, and 25% of postgraduate students reported serious levels of psychological distress, compared with just 2% of senior academics. “Students are in a pretty bad place,” says Dickerson. “And I worry this narrative is being normalized. It shouldn’t be swept under the carpet.”

Vaidyanathan says he did expect to see a difference in mental health between tenured faculty and students — but he didn’t expect it to be so profound. And although the majority of those surveyed seem to be coping with work stress, it is important to pay attention to those who are struggling. “We can’t dismiss those concerns as trivial,” he says.
https://doi.org/10.1038/d41586-022-00762-8
L'étude dont il est question :
https://workandwellbeingstudy.com

En particulier :
AESTHETICS IN SCIENCE
https://workandwellbeingstudy.com/wp-content/uploads/2022/03/2022_Vaid_FactSheet-Final.pdf
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Message par Topsy Turvy Sam 19 Mar 2022 - 16:57

Bientôt une nouvelle saison de mouches à fruits...
Rapid adaptation in fruit flies
University of Pennsylvania - March 17, 2022
Evolution is normally considered to be a gradual process, unfolding over long timescales. But new findings show that widespread physical and genomic adaptation to the environment can occur within just weeks.
[...]
https://www.sciencedaily.com/releases/2022/03/220317143723.htm
Seth M. Rudman, Sharon I. Greenblum, Subhash Rajpurohit, Nicolas J. Betancourt, Jinjoo Hanna, Susanne Tilk, Tuya Yokoyama, Dmitri A. Petrov, Paul Schmidt. Direct observation of adaptive tracking on ecological time scales in Drosophila. Science, 2022; 375 (6586) DOI: 10.1126/science.abj7484
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Message par Topsy Turvy Dim 20 Mar 2022 - 9:45

Pas news de labo, mais plateforme d'offres ouvertes aux étudiants et chercheurs ukrainiens :
https://scienceforukraine.eu
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Message par fift Dim 20 Mar 2022 - 9:54

Topsy Turvy a écrit:
Scientists’ ability to experience wonder, awe and beauty in their work is associated with higher levels of job satisfaction and better mental health, finds an international survey of researchers.
[...]
Lab News [original papers] - Page 2 D41586-022-00762-8_20227966
[...]


C'est rigolo, les biologistes aiment la complexité et les physiciens la simplicité Very Happy

fift

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Message par Wich Dim 20 Mar 2022 - 9:57

C'est rigolo, les biologistes aiment la complexité et les physiciens la simplicité Very Happy
Ça semble logique non ? Very Happy
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Message par Topsy Turvy Dim 20 Mar 2022 - 11:04

Vous avez toujours voulu savoir comment la queue de lézard est accrochée et décrochée ?

Watch this (âme sensible blablabla) :

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Message par Topsy Turvy Mer 30 Mar 2022 - 13:14

A presque 50 ans du message d'Arecibo, nouvelle proposition de comm' extraterrestre...

alien

Lab News [original papers] - Page 2 Galaxies-10-00055-g0A1

A Beacon in the Galaxy: Updated Arecibo Message for Potential FAST and SETI Projects
Galaxies 2022, 10(2), 55;
https://doi.org/10.3390/galaxies10020055

https://www.scientificamerican.com/article/researchers-made-a-new-message-for-extraterrestrials/
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Message par fift Mer 30 Mar 2022 - 13:48

Merci pour le partage Topsy, j'en connais un que ça va passionner Very Happy .

fift

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Message par Confiteor Mer 30 Mar 2022 - 14:12

J'espère qu'ils sont très malins les extra-terrestres paske moi j'ai pas tout compris alors que je connais pourtant un peu le sujet du message !

Certains se sont opposés à ce type d'initiative au prétexte que de petits hommes verts malveillants pourraient en tirer profit pour notre malheur.
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Message par Topsy Turvy Ven 1 Avr 2022 - 20:12

Génome humain séquencé de bout en bout, avec le gros de ce qui échappait à la prouesse technique :
Lab News [original papers] - Page 2 Science.abp8653-f1
The complete sequence of a human genome
[...]
To finish the last remaining regions of the genome, we leveraged the complementary aspects of PacBio HiFi and Oxford Nanopore ultralong-read sequencing to assemble the uniformly homozygous CHM13hTERT cell line (hereafter, CHM13) (17). The resulting T2T-CHM13 reference assembly removes a 20-year-old barrier that has hidden 8% of the genome from sequence-based analysis, including all centromeric regions and the entire short arms of five human chromosomes. Here, we describe the construction, validation, and initial analysis of a truly complete human reference genome and discuss its potential impact on the field
[...]
https://www.science.org/doi/10.1126/science.abj6987
Lab News [original papers] - Page 2 Science.abj6987-f1
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Message par Topsy Turvy Lun 4 Avr 2022 - 14:03

Un bouquin sur la/les population/s :
8 Billion and Counting: How Sex, Death, and Migration Shape Our World
Jennifer D. Sciubba W. W. Norton & Company (2022)
A provocative description of the power of population change to create the conditions for societal transformation.
https://www.jennifersciubba.com
Global population is crashing, soaring and moving
Josie Glausiusz
From Japan to Yemen, India to Ukraine, rates of births, deaths and displacement are reshaping nations.
[...]
The twenty-first century “is less a story about exponential population growth than it is a story about differential growth — marked by a stark divide between the world’s richest and poorest countries”, she writes.


How far will global population rise? Researchers can’t agree

In Latin America and the Caribbean, eastern and southeast Asia, Europe and North America, Australia and New Zealand, the total fertility rate (TFR), or average number of children a woman is likely to have in her lifetime, was below replacement level (around 2.1 children per woman) in 2020. By contrast, sub-Saharan Africa’s population is set to increase sixfold this century; its TFR is 4.72, down from 5.88 two decades ago. In Nigeria, children and adolescents are half of the population.
[...]
A 2021 report projects that by 2045, one-quarter of the Japanese population will have dementia (N. Nakahori et al. BMC Geriatr. 21, 602; 2021). As more people exit the labour force than enter it, wealthy countries worry about how to preserve economic growth. To soften the economic blow of ageing, Sciubba presents four options: raise retirement ages, cut benefits, push more people in the country to work or increase immigration.

She focuses at length on immigration. Only 2–4% of the world’s people live outside their country of origin, but between 2000 and 2020, according to the United Nations, the number of international migrants and refugees who had fled conflict, crises, persecution, violence or human-rights violations doubled from 17 million to 34 million. (This was all, of course, before Russia’s invasion of Ukraine forced more than four million refugees to flee the country.) Most of those compelled to move by the end of 2020 were internally displaced, as Sciubba notes. Between 2008 and 2020, an average of 21.8 million people per year had to move within their countries because of weather-related disasters, such as floods or wildfires.
[...]
Thanks to humanitarian intervention, global health campaigns, vaccination and improvements in sanitation, deaths from communicable diseases and famine fell abruptly in the decades before the COVID-19 pandemic. Deaths from HIV declined by 51% from 2000 to 2019, with the use of antiretroviral therapy saving millions of lives. Starvation in countries such as Yemen (or Afghanistan in 2022, where more than half the population is “acutely food insecure”, according to the UN World Food Programme) is not solely the result of population increase. It is often the outcome of economic sanctions and, in the case of Yemen, the bombing of infrastructure including markets, roads, ports, farms and water pipelines.

“A good health foundation makes countries far more prepared for the unexpected,” Sciubba concludes. With the right political will and with humanitarian intervention, it seems, people can turn the tide on disease and war.
Nature 604, 33-34 (2022)
https://doi.org/10.1038/d41586-022-00926-6
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Message par Topsy Turvy Mer 25 Mai 2022 - 19:05

Sympa, sur l'évolution du sommeil par rapport à nos cousins primates :
The awake ape: Why people sleep less than their primate relatives
Ancient humans may have evolved to slumber efficiently — and in a crowd
By Elizabeth Preston 04.28.2022
[...]
Lab News [original papers] - Page 2 G-primate-sleep-duration
[...]
https://knowablemagazine.org/article/society/2022/why-people-sleep-less-than-primate-relatives

Bon, je me doute que ceci va plus botter chunounouille...
Amber Dance, a freelance science journalist in Los Angeles, is really more of a cat person.
The tale of the domesticated horse
The beloved animal has shaped human history over millennia, just as people have influenced its evolution — but only recently have scientists discovered exactly when and where it went from wild to tame
By Amber Dance 05.04.2022
[...]
Lab News [original papers] - Page 2 P-horse-cave-painting
[...]
Lab News [original papers] - Page 2 G-genomes-ancient-modern
[...]
https://knowablemagazine.org/article/living-world/2022/tale-domesticated-horse
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Message par Topsy Turvy Lun 30 Mai 2022 - 20:04

Les noms d'oiseaux, de l'insulte à la louange. Je n'avais pas suivi ces recherches, shame on me :

https://www.scientificamerican.com/article/birdbrain-turns-from-insult-to-praise/

Quelques comparaisons en illustrations :
Tout en bas de la dernière illustration, le cerveau riquiqui de Finch.^^
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Message par Topsy Turvy Mar 14 Juin 2022 - 16:37

Ça faisait longtemps que je n'avais pas relayé d'article de Zaria Gorvett...

Sur l'histoire héroïque des arbres qui survivent à la vie citadine, Platane commun etc. :
https://www.bbc.com/future/article/20220601-are-city-forests-disappearing

https://fr.wikipedia.org/wiki/Platane_commun

Elle est jolie comme un coeur, Zaria Gorvett.

Lab News [original papers] - Page 2 P0bwx37m

https://authory.com/ZariaGorvett
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Message par Topsy Turvy Dim 19 Juin 2022 - 17:32

Pas en news mais en anglais, illustrations de quelques aliments commun et de leur origine :

Lab News [original papers] - Page 2 62876415cc312_wzaibs64rj451__700

Lab News [original papers] - Page 2 62876b4672a0f_pjmiwukj64581__700
Voir plus sur https://en.wikipedia.org/wiki/Brassica_oleracea
ou en français sur https://fr.wikipedia.org/wiki/Chou_commun
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Message par RonaldMcDonald Dim 19 Juin 2022 - 22:13

(déjà dit ailleurs, mais ça manque d'une fonction +1, dans le coin  Amour )
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