Quand un virus sauve une bactérie du suicide Dans la nature, les principaux ennemis des bactéries ne sont pas les antibiotiques, mais les bactériophages (ou phages). Dix fois plus nombreux que les bactéries, ils ne s'en prennent qu'à elles. Comme on peut le voir sur les photographies ci-dessus prises à l'aide d'un microscope, les phages ont la plupart du temps une forme de champignon : la tête contient le matériel génétique du virus, qui est injecté dans la bactérie par le pied. Sous la pression constante des phages, les bactéries ont développé de nombreuses stratégies de défense. Mais les bactéries ne sont pas les seules à évoluer. Comme l'explique un des auteurs de l'étude, George Salmond (université de Cambridge), "ce travail met en lumière le monde incroyablement dynamique de la co-évolution entre les bactéries et leurs virus".
Des chercheurs ont rajeuni le cerveau… d’abeilles Avec des sociétés humaines où l'espérance de vie ne cesse d'augmenter, la prévalence des maladies que l'on regroupe sous l'expression de "démence sénile" (essentiellement la maladie d'Alzheimer) est elle aussi à la hausse. D'où l'intérêt croissant de la science pour des modèles animaux permettant aux chercheurs de travailler sur les différents aspects de la sénescence. Et parmi ces modèles, on trouve l'abeille ouvrière dont la vie courte tient en l'espace de cinq à six semaines durant lesquelles elle occupe différents "postes" dans la société : elle commence par travailler à l'intérieur de la ruche, comme nettoyeuse, nourrice pour les larves, magasinière, ventileuse, cirière. Certaines s'aventurent ensuite à l'extérieur, d'abord pour garder l'entrée de la ruche puis pour butiner. On pourrait se dire que c'est le simple effet de l'âge. Il reste à découvrir comment fonctionnent les processus biochimiques qui restaurent les capacités cognitives perdues.
Eco Emergency Shelter Built Entirely From Shipping Pallets In a brilliant example of material reuse I-Beam has created a sustainable emergency shelter built completely out of shipping pallets. Originally designed as temporary housing for refugees of the Baltic War in the nineties, the affordable and robust shelter allows families to reestablish a homestead. Pallets are ubiquitous and uniform in size, so they make ideal building blocks after tragedies like the recent floods in Pakistan. As supplies come in from throughout the world, the shipping pallets for those supplies can be erected to make walls, ceilings, and floors. I-Beam‘s Pallet House is based on the fact that pallet buildings can be erected quickly and last for years. suzeeinthecity | Just another WordPress.com site Street Art Utopia Every month a “Most Beloved” post comes up in the main stream here on Street Art Utopia, and on this page can you see them all. Click on the name to see that months collection. 23 Beloved Street Art Photos – May 2014 – July 2014! 6 beloved Street Art Photos – April 2014 14 beloved Street Art Photos – February 2014 – March 2014 19 beloved Street Art Photos – Nov 2013 – Jan 2014 106 of the most beloved Street Art Photos – Year 2013 12 beloved Street Art Photos – October 2013 14 beloved Street Art Photos – August-September 2013 7 beloved Street Art Photos – July 2013 9 beloved Street Art Photos – June 2013 12 beloved Street Art Photos – May 2013 15 beloved Street Art Photos – April 2013 10 beloved Street Art Photos – Mars 2013 15 beloved Street Art Photos – Januari and Februari 2013 106 of the most beloved Street Art Photos – Year 2012 17 beloved Street Art Photos - October 2012 15 beloved Street Art Photos -September 2012 15 beloved Street Art Photos -August 2012 16 beloved Street Art Photos -July 2012
NUKEMAP Starting up... You might also try:MISSILEMAP 1. Drag the marker to wherever you'd like to target. Or type in the name of a city: 2. 3. Advanced options: 4. Note that you can drag the target marker after you have detonated the nuke. Created by Alex Wellerstein, 2012-2025. Other options: [?] Interested in nuclear history? DOOMSDAY MACHINESPost-Apocalyptic Road Trips, End of the World-Building, and Interesting Times NUKEMAP's fees and development are sponsored by: Ploughshares Fund Stevens Institute of Technology,School of Humanities, Arts, and Social Sciences Export to Google Earth (KMZ) (beta) No detonations to export! Render objects Advanced display options [+] Debug log: Click anywhere to load visualization Loading...
Vintage Mugshots from the 1920s The Sifter recently stumbled upon an incredible collection of vintage mugshots housed by the Historic Houses Trust. Many of these intriguing photographs are also accompanied by a description of the person and the crime(s) they have committed. For example, the image above of Mr. William Stanley Moore was taken May 1st, 1925. The images themselves are of excellent quality, beautifully composed and in many cases, quite artistic. 2. Albert Stewart Warnkin is listed in the NSW Police Gazette of 10 November 1920, as charged with attempting to carnally know a girl eight years old. 3. This photograph was apparently taken in the aftermath of a raid led by Chief Bill Mackay – later to be Commissioner of Police – on a house at 74 Riley Street, ‘lower Darlinghurst’. 4. When ‘Harry Leon Crawford’, hotel cleaner of Stanmore was arrested and charged with wife murder he was revealed to be in fact Eugeni Falleni, a woman and mother, who had been passing as a man since 1899. 5. 6. 7. 8. 9. 10. 11. 12.