9th
April
2,216 notes
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1 week ago 2,216 notes

infinity-imagined:

A hypothesized mechanism for the origin of life, an event called abiogenesis.  In this version, called RNA world, small molecules called nucleotides formed in the waters of the early Earth during the Hadean Eon, and polymerized on the surface of clay minerals.  These simple chains of RNA could replicate themselves in solution, but only slowly and inaccurately.  An RNA molecule developed which would fold into a structure that catalyzed RNA polymerization; a ribozyme.  The first ribozymes would replicate their sister strands, and produce copies of themselves and other RNA molecules. 

     In the same environment, long chains of carbon molecules called phospholipids were formed.  These molecules have two parts, the tail, which is hydrophobic, and the head, which is hydrophillic.  Because of these properties phospholipids will stick together and form micelles and vesicles in water.  Vesicles can absorb RNA nucleotides, concentrating them and creating a space where they can replicate, mutate and evolve.  At some point a ribozyme became enclosed within a vesicle, starting a chain reaction that evolved into the multitude of biological forms that we see today.

   Because this event occurred more than 3.8 billion years ago, theories about how and where it happened are highly speculative.  Possible environments for abiogensis include hydrothermal vents on the ocean floor, hyper saline bubbles of water trapped in ice, radioactive lakes or lagoons on earths surface, and even in space or on another planet, brought to earth through a panspermia event.  We have very little molecular evidence of the first cells, but ribozymes and catalytic RNA molecules are embedded in the DNA replication machinery of all life.  Because evidence of this event has almost certainly been lost to time, the true mechanisms of the origin of life may remain a mystery to science.

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9th
April
602 notes
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1 week ago 602 notes
9th
April
386 notes
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angulargeometry:

Blood Diamond.

angulargeometry:

Blood Diamond.

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1 week ago 386 notes

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1 week ago 138 notes

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2 weeks ago 659 notes

proofmathisbeautiful:

MAGNETISM

Via: Parachutes and PolicyMic

2 weeks ago 224 notes

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2 weeks ago 1,171 notes

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2 weeks ago 372 notes
3rd
April
867 notes
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2 weeks ago 867 notes
3rd
April
168 notes
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2 weeks ago 168 notes

coolsciencegifs:

See-through skin

A ‘vein-viewer' works by using infrared light to image the presence of veins underneath the skin: The IR light is absorbed by the deoxygenated haemoglobin within veins. The locations of absorption and reflection are detected and the machine generates a corresponding projection using visible light. Find out more about how these devices are used in medicine in this video!

Source: @rossexton

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2 weeks ago 5,620 notes

beautyandair:

Even though it’s an airbus this is a cool picture.

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2 weeks ago 473 notes

larameeee:

tensile structures

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2 weeks ago 519 notes
28th
March
647 notes
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2 weeks ago 647 notes