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15

This is an embryonic stem cell on the tip of a needle photographed on a scanning electron microscope (SEM). The image was taken by Steve Gschmeissner, see here for the original.


6

In addition to Alan Boyd's answer of a macrophage, it could also be a T cell or B cell. Try doing an image search for lymphocyte SEM and browsing through the different cell types. While the traditional image of T and B cells has been of a smooth round blast cell, they actually have numerous projections, folds, etc. to aid in forming the immunological ...


6

This looks like a macrophage to me, which is a white blood cell. Try Googling "macrophage sem" to see similar images (SEM = scanning electron microscopy/micrograph). The clue is the nature of the cell surface - those ruffles reflect the macrophage's role in engulfing foreign material. Indeed it is possible that some of the particles on the surface are ...


5

Lets start with the definition of a virus (from the Wikipedia page on viruses): A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to bacteria and archaea. So basically speaking you have a piece of genetic information (DNA or RNA) ...


2

The answer here lies in epidemiology and the pathogenic nature of the virus. Humans infected with Ebola have a range of recovery rates of 5-75%, meaning that most of those infected will not survive infection. Given the combination of preparedness factors at first recognizing a true outbreak in Ebola and viral load which had already been spread by the point ...


1

That is not true. If you had forgotten to add the antibiotic before inoculation then you can add it before the bacteria starts growing. Make sure you add it when the bacteria is still in lag phase. If you add it later then it won't be effective as some non-resistant (non-transformed) bacteria would have already expanded their population. Ampicillin and ...


1

Healthy plant growth depends on a microbial community that lives around and inside the roots of plants (Bais et al. 2001). Roots secrete from the roots a number of chemical compounds that influences the microbial community around but outside of the roots. The microbial community can include bacteria, fungi, and single-celled parasites, as well as larger ...



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