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With only a microscope, you might be able to find the bacteria, but how do you know what kind of bacterium it is? Taking Listeria, under a microscope, it looks like a small rod. Well, so do lots of other bacteria. If you only see that one bacterium, you can't take it and do any further tests with it, you can only see it. So we do cultures, where bacteria ...


A simple way to know if milk contains any bacterial contaminations is to take ~5 ml of the milk and add a couple of drops of methylene blue to it. If the milk is sterile, it will stay blue. If any bacteria are present they tend to take up the dye, leaving the sample colourless after ~1 hour. A more extensive way would be to plate 3-5 dilutions of the milk ...


There are a range of "nature microscopes" you can buy that will do this. One cool new portable microscope with video storage is the Mustcam.


You could go wild in a forest with a microscope if you had batteries. Yes Yes 200X


It looks like the shape is an ellipse rather than a circle. The ellipse has major and minor axes, which are described in terms of half-axes (177 and 175 pixels respectively). Is it possible the software is incorrectly using the half-axis measurements, whereas when you draw a perfect circle it will correctly use the diameter? This is consistent with the x and ...


you are correct that these grapes have raphides. After doing some research, I found out that the grape raphides are twinned crystals. Raphides can cause much irritation for many herbivores (therefore, it is a protection mechanism) but less so for humans. In grapes, however, the irritation is much less than other raphide-containing species. This probably has ...

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