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02/07/2022

SANTE/MEDECINE - ATTENTION : Tampons hygièniques cancérigènes

Le Le glyphosate est un désherbant très répandu produit par Monsanto. Il est reconnu comme cancérigène probable par le Centre international de recherche sur le cancer de l’OMS. Aussi incroyable que cela puisse paraître, du glyphosate a été détecté dans 85 % des produits d’hygiène intime en coton.

En plus du glyphosate, 62 % des échantillons testés se sont révélés positifs à l’AMPA (ou acide aminométhylphosphonique), un dérivé du glyphosate. Les échantillons qui comportaient de la gaze, des cotons-tiges des lingettes et des produits d’hygiène intime féminine, comme des tampons et des serviettes hygiéniques, ont été achetés dans les supermarchés et les pharmacies locales de la région de Plata en Argentine. Les résultats ont été présentés à l’occasion du 3e Congrès des Médecins des Villes Traitées par Fumigation, à Buenos Aires. « 85 % de l’ensemble des échantillons ont été testés positifs au glyphosate, mais dans le cas du coton et des gazes stériles de coton, le taux est de 100 % », précise le Dr Damian Marino, responsable de l’étude, à l’agence de presse Telam. « Nous avons pu constater, en ce qui concerne la concentration, que l’AMPA domine dans le coton brut (39 parties par milliard – PPB - et 13 PPB pour le glyphosate). Bien que la gaze ne contienne pas d’AMPA, son taux en glyphosate s’élève néanmoins à 17 parties par milliard. »

Pourquoi c'est dangereux ?

Le Dr Medardo Avila Vazquez, président du congrès, a déclaré que les résultats de cette étude étaient « préoccupants dans la mesure où vous utilisez du coton et de la gaze pour soigner des blessures ou pour des raisons d’hygiène en pensant qu’ils sont stérilisés. Les résultats montrent qu'ils sont contaminés par une substance probablement cancérigène. » La majorité du coton produit dans ce pays est génétiquement modifié pour devenir résistant au glyphosate. Celui-ci est pulvérisé quand le bourgeon s’ouvre. Le glyphosate va directement dans le plant de coton.

Le glyphosate est le composant clé du Round Up produit par le géant Monsanto.
C'est le désherbant le plus répandu dans les cultures aux États-Unis. Le coton, le soja, et le maïs ont tous été génétiquement modifiés pour résister à la diffusion de cet herbicide. Dans les faits, les agriculteurs ont pulvérisé 1,2 milliard de kilos d’herbicide à base de glyphosate de Monsanto, sur les terres agricoles aux États-Unis entre 1992 et 2012 selon le US Geological Survey. En 2015, le ministère de l’Agriculture américain a estimé que la culture de variétés génétiquement modifiées représente 94 % de la surface cultivée en coton.

Quelles sont les alternatives sans risque ?

Vous ne voulez plus utiliser de tampons ? C’est tout à fait possible !

Connaissez-vous les coupes menstruelles, les serviettes hygiéniques lavables ou encore les éponges naturelles ? Ce sont des alternatives sans danger pour votre santé. Vous pouvez opter également pour des tampons estampillés « bio » composés entièrement de coton biologique. Celui-ci n’est pas blanchi au chlore. Et il est sans plastique ni parfum. Vous pouvez les trouver dans les pharmacies, les magasins bio, ou encore sur Internet.

NB : une pétition a été lancée par un particulier en France pour exiger l’affichage de la composition des tampons d’une très grande marque. La pétition en ligne a déjà reçu plus de 265 211 soutiens ! Vous pouvez la trouver ici.

CommentEconomiser

01/07/2022

ASTRONOMY - The Solar System's Planet Trails

 2022 July 1

See Explanation.  Clicking on the picture will download
the highest resolution version available.

The Solar System's Planet Trails
Image Credit & CopyrightZheng Zhi

Explanation: Stars trail through a clear morning sky in this postcard from a rotating planet. The timelapse image is constructed from consecutive exposures made over nearly three hours with a camera fixed to a tripod beside the Forbidden City in Beijing, China on June 24. Arcing above the eastern horizon after the series of exposures began, a waning crescent Moon left the brightest streak and watery reflection. On that date the planets of the Solar System were also lined up along the ecliptic and left their own trails before sunrise. Saturn was first to rise on that morning and the ringed planet's trail starts close to the top right edge, almost out of the frame. Innermost planet Mercury rose only just before the Sun though. It left the shortest trail, visible against the twilight near the horizon at the far left. Uranus and Neptune are faint and hard to find, but mingled with the star trails the Solar System's planet trails are all labeled in the scene.

30/06/2022

MERVEILLEUX MONDE SOUS-MARIN - La flabelline blanche


La Flabelline blanche mesure de 3 à 4 cm à l'âge adulte. Elle vit sur des pans de roche richement colonisés par des hydraires, mais reste bien plus rare que la Flabelline mauve.

L'appareil branchial est composé de 7 à 8 groupes d'appendices ramifiés non rétractiles. Les rhinophores sont lamellés et les tentacules buccaux sont lisses et relativement longs.

Le corps est blanc laiteux, seule l'extrémité des cérates est orange vif.

Méditerranée - France - Archipel des Iles d'Hyères - Ile du Levant.

Flabelline blanche (Flabellina babai - White flabellina)

© Alexis Rosenfeld 

ASTRONOMY - Solar System Family Portrait

 2022 June 30

The featured image is a circular, fisheye, all-sky image 
showing every planet in the Solar System lined up horizontally 
along the image center, along with Earth's Moon. Trees and 
hills from the Atacama Desert link populate the outer circle edge.
Please see the explanation for more detailed information.

Solar System Family Portrait
Image Credit & Copyright: Alexis Trigo

Explanation: Yes, but have you ever seen all of the planets at once? A rare roll-call of planets has been occurring in the morning sky for much of June. The featured fisheye all-sky image, taken a few mornings ago near the town of San Pedro de Atacama in Chile, caught not only the entire planet parade, but the Moon between Mars and Venus. In order, left to right along the ecliptic plane, members of this Solar System family portrait are EarthSaturnNeptuneJupiterMarsUranusVenusMercury, and Earth. To emphasize their locations, Neptune and Uranus have been artificially enhanced. The volcano just below Mercury is Licancabur. In July, Mercury will move into the Sun's glare but reappear a few days later on the evening side. Then, in August, Saturn will drift past the direction opposite the Sun and so become visible at dusk instead of dawn. The next time that all eight planets will be simultaneously visible in the evening sky will be in 2122.

28/06/2022

ASTRONOMY - Mercury from Passing BepiColombo

 2022 June 28

The featured image shows the heavily cratered surface
of Mercury with parts of ESA's and JAXA's passing robotic
BepiColombo in the foreground. 
Please see the explanation for more detailed information.

Mercury from Passing BepiColombo
Image Credit & LicenseESAJAXABepiColomboMTM

Explanation: Which part of the Moon is this? No part -- because this is the planet Mercury. Mercury's old surface is heavily cratered like that of Earth's Moon. Mercury, while only slightly larger than Luna, is much denser and more massive than any Solar System moon because it is made mostly of iron. In fact, our Earth is the only planet more dense. Because Mercury rotates exactly three times for every two orbits around the Sun, and because Mercury's orbit is so elliptical, visitors on Mercury could see the Sun rise, stop in the sky, go back toward the rising horizon, stop again, and then set quickly over the other horizon. From Earth, Mercury's proximity to the Sun causes it to be visible only for a short time just after sunset or just before sunrise. The featured image was captured last week by ESA and JAXA's passing BepiColombo spacecraft as it sheds energy and prepares to orbit the innermost planet starting in 2025.

26/06/2022

SAUDE/MEDECINA - Estamos muito perto de encontrar uma vacina contra o cancro

Ter uma vacina que previna o cancro é o sonho de investigadores de todo o mundo. Graças à pandemia da Covid-19, a comunidade científica e a população perceberam melhor que, talvez, o caminho da imunização deva mesmo seguir pela estrada do mRNA.

Na área do cancro, a chamada medicina de precisão tem sido fundamental na identificação de mutações tumorais que podem ser usadas como alvo de vacinas de mRNA personalizadas. “Durante muitos anos ficámos todos deslumbrados com a possibilidade de identificarmos alterações genéticas nos genes do cancro, mas agora já estamos a perceber que existem também muitas alterações no RNA [ácido ribonucleico, molécula essencial na síntese de proteínas] e no metabolismo de pequenas moléculas”, comenta Maria do Carmo Fonseca, cientista galardoada com o Prémio Pessoa em 2010, atualmente presidente da RNA Society.

“Da mesma maneira que, na Covid-19, injetamos o mRNA que codifica a proteína Spike, numa vacina contra o cancro temos de incluir a informação genética que codifica as proteínas próprias das células cancerosas e que são especificas daquele cancro”, explica a investigadora. No entanto, ao contrário do SARS-CoV-2, em que a proteína Spike é igual para todos os doentes, no cancro cada caso é um caso e a vacina tem de ser muito personalizada.

Testadas sobretudo em pacientes com melanoma, na Alemanha e nos Estados Unidos da América, as vacinas já foram administradas a “centenas de doentes” no âmbito de ensaios clinicos, “com resultados muito promissores”, assegura Carmo Fonseca.

Em Portugal, a cientista conduz uma investigação revolucionária que, no futuro, poderá criar uma vacina de mRNA capaz de “ensinar o nosso sistema imune a reconhecer as células cancerosas, assim que elas aparecem no corpo, e a destruí-las imediatamente”. Esta vacina vai ser específica para cancros hereditários resultantes de mutação BRCA e, neste momento, os investigadores estão focados na mutação fundadora portuguesa, que é a mais frequente em Portugal.

Os mais importantes avanços da Ciência na área do cancro – seja na prevenção, como no caso das vacinas, seja no diagnóstico (em que a Inteligência Artificial começa a dar cartas) e, principalmente, no tratamento (com as novas terapias celulares a ensinarem o nosso corpo a adquirir uma “superimunidade”) – são longamente esmiuçados num artigo da VISÃO Saúde .

Nada disto é ficção científica – a tecnologia está aí e, em muitos casos, consegue mesmo salvar-nos.

Visão

ASTRONOMY - Light Echoes from V838 Mon

 2022 June 26

The featured image shows the unusual light
echo structure known as V838 Mon. The illuminated dust
is patchy and surrounds a bright red-colored star.
Please see the explanation for more detailed information.

Light Echoes from V838 Mon
Image Credit: NASAESAH. E. Bond (STScI)

Explanation: What caused this outburst of V838 Mon? For reasons unknown, star V838 Mon's outer surface suddenly greatly expanded with the result that it became one of the brighter stars in the Milky Way Galaxy in early 2002. Then, just as suddenly, it shrunk and faded. A stellar flash like this had never been seen before -- supernovas and novas expel matter out into space. Although the V838 Mon flash appears to expel material into space, what is seen in the featured image from the Hubble Space Telescope is actually an outwardly expanding light echo of the original flash. In a light echo, light from the flash is reflected by successively more distant surfaces in the complex array of ambient interstellar dust that already surrounded the star. V838 Mon lies about 20,000 light years away toward the constellation of the unicorn (Monoceros), while the light echo above spans about six light years in diameter.

OVNI - Espirais de luz azul no céu da Nova Zelândia

Eram 19h25 de domingo quando Alasdair Burns, guia de observação de estrelas na Ilha Stewart, Nova Zelândia, recebeu uma mensagem de um amigo a pedir que fosse olhar para o céu. Burns saiu de casa e testemunhou uma enorme espiral azul de luz no meio da escuridão do céu. “Parecia uma enorme galáxia em espiral, ali a pairar no céu e a atravessá-lo lentamente. Foi uma sensação muito estranha”, confessa, citado pelo The Guardian.

Depois de ter observado o fenómeno durante uns segundos, rapidamente se lembrou de eternizar o momento e capturou algumas imagens.

Richard Easther, físico na Universidade de Auckland, explicou ao jornal que são formadas nuvens desta natureza quando um foguetão leva um satélite para a órbita da terra. “Quando o combustível propulsor é ejetado, o que temos essencialmente é água e dióxido de carbono, que formam uma nuvem iluminada pelo sol”, começa por explicar.

“A combinação da geometria da trajetória da órbita do satélite e da forma como nós estamos posicionados em relação ao Sol foi o que foi capaz de produzir estas nuvens esquisitas que eram visíveis da Ilha Sul”, acrescenta o físico.

O “espetáculo” observado terá sido provocado pelo lançamento do satélite da Globalstar a cargo da SpaceX, que foi enviado para uma órbita mais baixa a partir do Cabo Canaveral, na Flórida.

Visão

25/06/2022

ASTRONOMY - Planets of the Solar System

 2022 June 25

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Planets of the Solar System
Image Credit & CopyrightAntonio Canaveras, Chiara Tronci, Giovanni Esposito, Giuseppe Conzo, Luciana Guariglia, (Gruppo Astrofili Palidoro)

Explanation: Simultaneous images from four cameras were combined to construct this atmospheric predawn skyscape. The cooperative astro-panorama captures all the planets of the Solar System, just before sunrise on June 24. That foggy morning found innermost planet Mercury close to the horizon but just visible against the twilight, below and left of brilliant Venus. Along with the waning crescent Moon, the other bright naked-eye planets, Mars, Jupiter, and Saturn lie near the ecliptic, arcing up and to the right across the wide field of view. Binoculars would have been required to spot the much fainter planets Uranus and Neptune, though they also were along the ecliptic in the sky. In the foreground are excavations at an ancient Roman villa near Marina di San Nicola, Italy, planet Earth.

24/06/2022

ASTRONOMY - Filaprom on the Western Limb

 2022 June 24

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Filaprom on the Western Limb
Image Credit & CopyrightMartin Wise

Explanation: A solar filament is an enormous stream of incandescent plasma suspended above the active surface of the Sun by looping magnetic fields. Seen against the solar disk it looks dark only because it's a little cooler, and so slightly dimmer, than the solar photosphere. Suspended above the solar limb the same structure looks bright when viewed against the blackness of space and is called a solar prominence. A filaprom would be both of course, a stream of magnetized plasma that crosses in front of the solar disk and extends beyond the Sun's edge. In this hydrogen-alpha close-up of the Sun captured on June 22active region AR3038 is near the center of the frame. Active region AR3032 is seen at the far right, close to the Sun's western limb. As AR3032 is carried by rotation toward the Sun's visible edge, what was once a giant filament above it is now partly seen as a prominence, How big is AR3032's filaprom? For scale planet Earth is shown near the top right corner.

LES PLUS BEAUX ASTRES DE LA VOIE LACTéE - Pluton : la planète naine

Cette vue d'artiste représente la surface de Pluton , imaginée d'après les études scientifiques. Elle montre des amas de méthane sur...