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English: The Evolution of Bacteria on a “Mega-Plate” Petri Dish: Bacteria (white) grow on a large petri dish with increasing concentrations of antibiotic (trimethoprim) in bands towards the center. Evolution of antibiotic resistance can be seen as mutants with higher antibiotic resistance are able to colonise the more central regions.
Microscopy is an art and a science, revealing the alien beauty of the hidden world all around us. The 2022 winners include a stack of moth eggs, a flowery sea of colon cells, and bacteria coating ...
After its introduction in the 1940s, live-cell imaging rapidly became popular using phase-contrast microscopy. [11] The phase-contrast microscope was popularized through a series of time-lapse movies (see video), recorded using a photographic film camera. [12] Its inventor, Frits Zernike, was awarded the Nobel Prize in 1953. [13]
Sea salt crystals seen with a USB microscope. Table salt crystals seen with a USB microscope. The top side of a sage leaf seen with a USB microscope - trichomes are visible. The USB image of the underside of a sage leaf - more trichomes are visible on this side. A USB microscope is a low-powered digital microscope which connects to a computer's ...
Bright-field microscopy (BF) is the simplest of all the optical microscopy illumination techniques. Sample illumination is transmitted (i.e., illuminated from below and observed from above) white light , and contrast in the sample is caused by attenuation of the transmitted light in dense areas of the sample.
Gram-positive bacteria have a thick mesh-like cell wall made of peptidoglycan (50–90% of cell envelope), and as a result are stained purple by crystal violet, whereas gram-negative bacteria have a thinner layer (10% of cell envelope), so do not retain the purple stain and are counter-stained pink by safranin. There are four basic steps of the ...
A single expulsion by one bobtail squid produces enough bacterial symbionts to fill 10,000m 3 of seawater at a concentration that is comparable to what is found in coastal waters. [39] Thus, in at least some habitats, the symbiotic relationship between A. fischeri and E. scolopes plays a key role in determining the abundance and distribution of ...
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