Amoeboid Swimming: Crawling in a Fluid
Researchers from CNRS, Inserm and Université Joseph Fourier — Grenoble have developed a particularly simple model that reproduces the swimming mechanism of amoebas. They show that, by changing shape, these single cell organisms propel themselves forward in a viscous fluid at the same speed as when they crawl on a solid substrate.
This work has recently been published in the journal Physical Review Letters.
Alexander Farutin, Salima Rafaï, Dag Kristian Dysthe, Alain Duperray, Philippe Peyla, Chaouqi Misbah. Amoeboid Swimming: A Generic Self-Propulsion of Cells in Fluids by Means of Membrane Deformations. Physical Review Letters, 2013; 111 (22) DOI: 10.1103/PhysRevLett.111.228102
Cell shape deformations during a swimming cycle. (Credit: © LIPhy, CNRS/UJF Grenoble)
Interesting facts about our body
- The human body shines in the darkness
In Japan, researchers have succeeded with more sensitive cameras to detect that human body shines. They found that our bodies emit very small amounts of light. This light is so small that a human does not register them. While this is long been known that all living things produce a small amount of light as a result of chemical reactions in the body. Now scientists in Japan for the first time in the world are managed to prove that and to record this phenomenon.
- The human body produces aspirin
By taking or eating fruits and vegetables the human body can make a personal aspirin. Thus, one study found, and proved that the human body from the acids of fruit and vegetable products, salicylic acid, a key component that makes aspirin and anti-inflammatory properties for pain.
- Orgasm causes sneezing
Some men feel a headache after ejaculation, while some of them sometimes start to sneeze. Greater activity in the nervous system of human body can be blamed for headaches, while for the sneezing after orgasm is responsibility the brain center. The speed of sneezes can reach up to 100km per hour and more. The record was 160km per hour.
- Our tongue has an original print
If you did not know, like our fingerprints, a tongue is different from person to person. Due to the uniqueness of form and texture of each physiological tongue, it is very important for example in determining the identity of a person.
- The skin on the feet is thickest
Skin is thickest on the palms and soles, and its thickness in these parts of the body is up to 4 millimeters. It is also mentioned that skin in these parts of the human body has the most sweat glands.
- Appendix is not a useless part of the human body
Many people thought that the appendix is just a useless part of the body, but it has a function. Appendix is some kind of a safe house for beneficial bacteria that live in the human stomach and promote digestion of the food.
- Blondes have more hair than others
There is a lot of jokes about blonde girls, however one study found that blondes have more hair then other girls. Hair color for example revealed a completely different investigation, determine the density of hair. The average human hair has a hundred thousand root hairs, each of which can produce twenty individual hairs while the whole of human life. While blondes have on average 146 thousand follicles while people with black hair have about 110 thousand follicles. The least dense hair have a redhead people, less than 100 thousand follicles.
Science gifs part 1.
From left to right:
Series of posters created for the love of math, nature, art, and education.
Prints available: http://meganemoore.storenvy.com/
If only there were one for reticulated splines, the set would be complete!