Posts tagged biology
Anatomical Drawings by Andreas Vesalius
Transparent Specimens by Iori Tomita
A 3-D view of a model protocell (a primitive cell) approximately 100 nanometers in diameter. The protocell’s fatty acid membrane allows nutrients and DNA building blocks to enter the cell and participate in non-enzymatic copying of the cell’s DNA. The newly formed strands of DNA remain in the protocell.
The jellyfish Atolla lives worldwide in the deep sea, where light levels are very low. The jellyfish is bioluminescent — emitting blue-green light — and so are most of its prey. Scientists think that the deep red color of the animal’s stomach serves a purpose — to keep the blue light of its luminescent lunch from escaping and giving away Atolla’slocation to its own predators.
Damaged Cells Are Highly Mobile But Lack Direction
Cells on the move reach forward with lamellipodia and filopodia, cytoplasmic sheets and rods supported by branched networks or tight bundles of actin filaments. Cells without functional lamellipodia are still highly motile but lose their ability to stay on track, report researchers at the Stowers Institute for Medical Research in today’s online issue of the Journal of Cell Biology.
Their study provides new insight into cell motility, a complex and integrated process, which, when gone awry, can lead to various disease conditions such as cancer metastasis, birth defects, cardiovascular disease and compromised immune function.
Moon Jelly (Aurelia aurita)- 12cm, Scyphomedusae, White Sea, Russia (photo: Alexander Semenov)