Microorganism and other cool things
Reblogged from quartnaqs, Posted by neeku.
Reblogged from rorschachx, Posted by rorschachx.
rorschachx:

Zebrafish Stripes Caused by Cells That Chase Each Other
A cellular game of run-and-chase could help form the iconic stripes on zebrafish skin. Contact between two types of skin cells, the black “melanophores” and the yellow “xanthophores,” prompts the melanophores to move away and the xanthophores to follow in hot pursuit, developmental biologists report online this week in the Proceedings of the National Academy of Sciences. The researchers’ models suggest that such interactions lead to the pigment cells separating into the distinct bands of zebrafish stripes. To understand how interactions between cells might lead to striped or spotted skin, the scientists found a way to grow pigment cells from zebrafish tail fins in lab dishes. Pigment cells of the same type didn’t seem to interact. But when xanthophores and melanophores were near each other, the yellow cells (apparently attracted) reached out to touch the black ones. The black ones, in turn, were repulsed by the overture and moved away. Undeterred, the xanthophores followed. (In the gif [video], a yellow xanthophore chases a gray melanophore across the screen.) Cells from a zebrafish mutant called jaguar, which has broader, fuzzier stripes, behaved differently. Their black melanophores do not run from the yellow xanthophores, and the xanthophores do not chase them as ardently. This, the researchers say, could explain the mixed populations of yellow and black cells in the stripes’ fuzzy borders. The team hasn’t yet observed the cell movements in developing fish, but the work may help explain why mutations in genes that make proteins that are part of cell membranes can lead to different skin patterns in fish. It may also help explain how other animals—zebras, jaguars, leopards, or Dalmatians—get their patterned skin.
Via sciencemag.org
Reblogged from inxp, Posted by fuckyeahyoga.
fuckyeahyoga:

eating healthy doesnt have to be tasteless!
Reblogged from superlark, Posted by superlark.
superlark:

I wish I had the time to take more classes during undergrad; I could never fit neurobio and its lab into my schedule.
Here is a picture of neurons and their basic parts with really basic definitions. There are a lot of other things about them that aren’t included but this is a start.
Full size.
Reblogged from sciencesoup, Posted by sciencesoup.
sciencesoup:

The Birth of Brain Cells
This might look like a distant web of galaxies captured by a powerful telescope, but it’s actually a microscopic image of a newborn nerve cell. The human brain contains more cells than there are stars in our galaxy, and the most important cells are neurons, which are nerve cells responsible for transmitting and processing electro-chemical signals at up to 320 km/h. This chemical signalling occurs through synapses—specialised connections with other cells, like wires in a computer. Each cell can receive input from thousands of others, so a typical neuron can have up to ten thousand synapses—i.e., can communicate with up to ten thousand other neurons, muscle cells, and glands. Estimates suggest that adult humans have approximately 100 billion neurons in their brain, but unlike most cells, neurons don’t undergo cell division, so if they’re damaged they don’t grow back—except, apparently, in the hippocampus (associated with memory) and the olfactory bulb (associated with sense of smell). The process by which this occurs is unclear, and this image was taken during a project to determine how neurons are born—it actually depicts newborn nerve cells in an adult mouse’s brain.
(Image Credit: Dana Bradford)