muufi

parlanceofafrail: PhagocytosisSpecialized immune cells such as...

Wed, 22 May 2013 20:45:18 +0200

Phagocytosis

Specialized immune cells such as macrophages internalize and destroy bacteria to fight infections. This process, called phagocytosis is a key part of the innate mammalian immune system.

When an invading bacterium binds to the membrane of a macrophage, the cell membrane starts to wrap around the invader and internalizes the pathogen. This process was so far mainly investigated by conventional light and electron microscopy, which provide primarily kinematic and structural information. However, the mechanical properties of this process, described by the physical forces and energies involved are still barely known.

We investigate the mechanics of the phagocytic machinery by using optical tweezers in combination with live cell microscopy. We found that filopodia, thin spike-like cell protrusions act as cellular tentacles during phagocytosis: a few seconds after binding to a particle, filopodia retract and pull the bound particle toward the cell. This retraction is f-actin dependent and has a mean step size of 36 nm. The force-velocity relationship of this filopodial retraction is in agreement with the kinetics of an ensemble of multiple motors.

[Source]

nothing-without-science: Cell Division

Wed, 22 May 2013 20:30:19 +0200

nothing-without-science:

Cell Division

micro-universe: Scanning Electron Microscope animations created...

Wed, 22 May 2013 20:15:27 +0200

A bacterium on a diatom on an amphipod.

Diatoms and bacteria on an amphipod.

Pollen stuck between hairs on a bee.

Hair on a bee

The head of a housefly

Cilliates and diatoms on the surface on an amphipod

The skin of an unknown organism found stuck to a bee.

Central pillar structure of a diatom

Zooming in on the wing of a moth.

micro-universe:

Scanning Electron Microscope animations created by James Tyrwhitt-Drake at the UVic Advanced Microscopy Facility.

Photo

Tue, 21 May 2013 20:45:25 +0200

satanswifeisnaked: me every day

Tue, 21 May 2013 20:30:31 +0200

satanswifeisnaked:

me every day

blunt-kitty: so toasted right now.

Tue, 21 May 2013 20:16:21 +0200

blunt-kitty:

so toasted right now.

Photo

Mon, 20 May 2013 20:45:15 +0200

nothing-without-science: Seeing the Brain With New CLARITY A...

Mon, 20 May 2013 20:30:18 +0200

nothing-without-science:

Seeing the Brain With New CLARITY

A new brain imaging technique called CLARITY allows neural structures to be reconstructed in three dimensions better than ever before. It does so by turning the brain “transparent”.

Truly understanding the inner workings of the brain means studying not only how individual neurons function, but also how they are wired together. Even with techniques like the beautiful “brainbow”, untangling spaghetti-like long-range connections has proven difficult.

Stanford University neuroscientists have taken a step in that direction with their new CLARITY method. Neurons and other cells are normally labeled by sticking fluorescent tags on various proteins and other molecules that a researcher wants to study. That way we can literally see where and how they function. But looking into a three-dimensional brain is like peering into murky water: the fatty cell membranes and neuron sheaths just get in the way.

The Stanford researchers immobilized these mouse brains in a gel, then washed away all the murky muck. This left all the connections and proteins in their right place, free to be labeled in a clear block of brain Jell-O.

For more: Head over to Nature News to read more, and be sure to watch their great, detailed video to find out more about how it was done. If you’re interested, here’s the research paper in this week’s Nature.

wowbob:

Mon, 20 May 2013 20:15:12 +0200

wowbob:

autarque: The Cabinet of Dr. Caligari, Robert Wiene, 1920

Sun, 19 May 2013 20:45:29 +0200

autarque:

The Cabinet of Dr. Caligari, Robert Wiene, 1920

alveraz: Man And Bicycle My Website My Facebook

Sun, 19 May 2013 20:30:36 +0200

alveraz:

Man And Bicycle

My Website

My Facebook

waterpistolman: Wooden by Antoni Tudisco

Sun, 19 May 2013 20:15:29 +0200

waterpistolman:

Wooden by Antoni Tudisco

Wile E. Coyote Vector Illustration by Vectorportal on Flickr.

Sat, 18 May 2013 20:45:21 +0200

Wile E. Coyote Vector Illustration by Vectorportal on Flickr.

smile by Maianer on Flickr.A través de Flickr: Thank you all for...

Sat, 18 May 2013 20:30:25 +0200

smile by Maianer on Flickr.

A través de Flickr:
Thank you all for watching and Commenting my Pictures !

Liquid Art

Bad Taste by Graf+ on Flickr.

Sat, 18 May 2013 20:15:54 +0200

Bad Taste by Graf+ on Flickr.

fala7idreams: Wanted For International Terrorism George W....

Fri, 17 May 2013 20:45:22 +0200

fala7idreams:

Wanted For International Terrorism

George W. Bush, Margret Thatcher, Ehud Olmert

Derry, Northern Ireland

. by Gabri Le Cabri on Flickr.A través de Flickr: Buenos Aires

Fri, 17 May 2013 20:30:27 +0200

. by Gabri Le Cabri on Flickr.

A través de Flickr:
Buenos Aires

Sahara by server pics on Flickr.A través de Flickr: Athens...

Fri, 17 May 2013 20:15:22 +0200

Sahara by server pics on Flickr.

A través de Flickr:
Athens Street Art, Greece.

Charlie Brown (@OfficialPeanuts Arsonist) by Banksy by dullhunk...

Thu, 16 May 2013 20:45:28 +0200

Charlie Brown (@OfficialPeanuts Arsonist) by Banksy by dullhunk on Flickr.

A través de Flickr:
quote

“Banksy has a much publicised casual attitude towards recreational copyright infringement and you are invited to download whatever you wish from www.banksy.co.uk for personal use. However, making your own art or merchandise and passing it off as ‘official’ or authentic Banksy artwork is a criminal offence….

Please feel free to

* Copy any www.banksy.co.uk imagery in any way for any kind of personal amusement
* Make your own Banksy merchandise for non-commercial purposes
* Pretend you drew it yourself for homework

Please do not:

* Put up signs saying “strictly no photographs” when all you do is sell photographs of my graffiti
* Write ‘Banksy’ next to an image of a panda waving hand guns (not mine, don’t know whose it is)
* Take images off my website and ‘license’ them for a huge fee to a German calendar company”

unquote

en.wikipedia.org/wiki/Charlie_Brown

Madonnes… by Έnder on Flickr.A través de Flickr: Florence...

Thu, 16 May 2013 20:30:29 +0200

Madonnes… by Έnder on Flickr.

A través de Flickr:
Florence 2013

contact : ender.stencil@yahoo.fr