physicsshiny
currentsinbiology:

World’s smallest propeller could be used for microscopic medicine
Scientists are working in their laboratories to create robots that are only nanometers — billionths of a meter — in length, small enough to maneuver inside the human body and possibly inside human cells. The impact of these miraculous microscopic machines on medicine can only be imagined, but there is no doubt that it will be significant.



One of the first steps in creating these robots is figuring out how to make them move. In a paper published in the June 2014 issue of ACS Nano, an Israeli and German team announced that they had succeeded in creating a tiny screw-shaped propeller that can move in a gel-like fluid, mimicking the environment inside a living organism.
Debora Schamel, Andrew G. Mark, John G. Gibbs, Cornelia Miksch, Konstantin I. Morozov, Alexander M. Leshansky, Peer Fischer. Nanopropellers and Their Actuation in Complex Viscoelastic Media. ACS Nano, 2014; 140624102214000 DOI: 10.1021/nn502360t
Tissue and biological fluids are complex viscoelastic media with a nanoporous macromolecular structure. Here, we demonstrate that helical nanopropellers can be controllably steered through such a biological gel. The screw-propellers have a filament diameter of about 70 nm and are smaller than previously reported nanopropellers as well as any swimming microorganism. We show that the nanoscrews will move through high-viscosity solutions with comparable velocities to that of larger micropropellers, even though they are so small that Brownian forces suppress their actuation in pure water. When actuated in viscoelastic hyaluronan gels, the nanopropellers appear to have a significant advantage, as they are of the same size range as the gel’s mesh size. Whereas larger helices will show very low or negligible propulsion in hyaluronan solutions, the nanoscrews actually display significantly enhanced propulsion velocities that exceed the highest measured speeds in Newtonian fluids. The nanopropellers are not only promising for applications in the extracellular environment but small enough to be taken up by cells.

currentsinbiology:

World’s smallest propeller could be used for microscopic medicine

Scientists are working in their laboratories to create robots that are only nanometers — billionths of a meter — in length, small enough to maneuver inside the human body and possibly inside human cells. The impact of these miraculous microscopic machines on medicine can only be imagined, but there is no doubt that it will be significant.

One of the first steps in creating these robots is figuring out how to make them move. In a paper published in the June 2014 issue of ACS Nano, an Israeli and German team announced that they had succeeded in creating a tiny screw-shaped propeller that can move in a gel-like fluid, mimicking the environment inside a living organism.

Debora Schamel, Andrew G. Mark, John G. Gibbs, Cornelia Miksch, Konstantin I. Morozov, Alexander M. Leshansky, Peer Fischer. Nanopropellers and Their Actuation in Complex Viscoelastic Media. ACS Nano, 2014; 140624102214000 DOI: 10.1021/nn502360t

Tissue and biological fluids are complex viscoelastic media with a nanoporous macromolecular structure. Here, we demonstrate that helical nanopropellers can be controllably steered through such a biological gel. The screw-propellers have a filament diameter of about 70 nm and are smaller than previously reported nanopropellers as well as any swimming microorganism. We show that the nanoscrews will move through high-viscosity solutions with comparable velocities to that of larger micropropellers, even though they are so small that Brownian forces suppress their actuation in pure water. When actuated in viscoelastic hyaluronan gels, the nanopropellers appear to have a significant advantage, as they are of the same size range as the gel’s mesh size. Whereas larger helices will show very low or negligible propulsion in hyaluronan solutions, the nanoscrews actually display significantly enhanced propulsion velocities that exceed the highest measured speeds in Newtonian fluids. The nanopropellers are not only promising for applications in the extracellular environment but small enough to be taken up by cells.

bigcatkingdom

dreaming-beneath-the-willow asked:

For those who don't know why cub petting is wrong, can you care to explain why it is? I have never heard of anything like that and I'm just curious.

anythingfeline answered:

Cub petting (or pay to play schemes - same thing) is where people go and pet big cat cubs. Often, the public does not know that this is animal cruelty; facilities usually lie to people telling them that these cubs are orphans or they’ve been rescued, this is not the case. Big cats like lions or tigers, for example, are bred and inbred (ex: white tigers, white lions) -excessively and constantly, which causes diseases like cancer- to produce cubs that are put into this cruel industry. People then pay money to these irresponsible and misleading organizations to pet these cubs. Constantly being touched and moved around, woken up and drugged and not fed properly puts a lot of stress & damage on these cubs’ little bodies and they can get sick very easily. Then, when they are older and more dangerous to be in contact with humans, they are sent to roadside zoos, or run down facilities where they will be put in small cages with concrete floors for the rest of their lives OR they will be sold to be killed for their parts. 

Denied of their natural behaviors, denied of their mother, denied of a happy, healthy life.

Their entire life, they will be forced to live in abusive conditions. What kind of life is that for such a beautiful animal? Why would people do this? The answer is simple: money. The facilities that do this don’t care for the well being of these animals, they only want money and they will do anything to get it. 

I highly encourage you to watch this video, and then tell me that you see nothing wrong with it, I dare you. 

Also, for more information as well as a resource, please read this

Everything I have said is not against you or to insult you, so please do not be offended. I am just merely explaining the fact that cub petting = animal cruelty. 

astropheminism

mostlycatsmostly:

Adopt Peso! Forever Home Needed!

SIGNAL BOOST!
This handsome, neutered male cat is litterbox trained, up to date with his shots, about a year old and a bundle of joy and cuteness.

Peso likes humans and is friendly towards dogs and other cats. Likes his toys and enjoys getting attention and petting when he feels like getting some. He is playful and fun to be around and his gentle temperament makes him a wonderful family cat.

He doesn’t enjoy being held and is not a lap cat, but likes to stay close and keep you company and follow the house rules.

Peso is an international rescue from Iran, and has come long way in search of a loving forever home. He is a healthy one eye cat, and through that one eye he is looking forward to living a long and happy life with his loving family.

If you like to know more about handsome Peso, contact Farah Ravon at kfravon@yahoo.com
(via Cristina Penescu)
(via Petfinder Adoptable | Cat | Persian | Los Angeles, CA | Peso)

astropheminism

ayefuckmepapi:

ludicrouscupcake:

poppy-the-knight:

sourcedumal:

I Love My Boo campaign features real young men of color loving each other passionately. Rather than sexualizing gay relationships, this campaign models caring, and highlights the importance of us taking care of each other. Featured throughout New York City, I Love My Boo directly challenges homophobia and encourages all who come across it to critically rethink our notion of love.

GMHC is the world’s first and leading provider of HIV/AIDS prevention, care and advocacy. Building on decades of dedication and expertise, we understand the reality of HIV/AIDS and empower a healthy life for all. GMHC fights to end the AIDS epidemic and uplift the lives of all affected.

this is fucking adorable

SPREAD THESE IMAGES LIKE WILDFIRE PRECISELY BECAUSE THEY FUCK UP THE MISGUIDED STEREOTYPES WE ALL ARE USED TO SEEING.

👏👏👏