There are multiple ways to count the bacteria colonies growing in a Petri dish, from simple counting by hand, to complex machinery designed to electronically measure colony growth. Depending on how many Petri dishes need to be counted, and how often measurement is taking place, different users will benefit from different counting methods.Know More
Counting by hand is appropriate for most lab settings, since the only resource required is time. It is both economical and easy; anyone capable of counting and recording spots observed in the Petri dish is capable of counting colonies via this method. There are some simple tools, including markers and counters operated by manual clicks, that can aid in the recording process. The downside of counting by hand is that it is time-consuming and can be prone to human error.
There are machines that have been designed specifically to measure the number of colonies present in a Petri dish. These machines provide users with an output that includes count numbers and growth over a specific period of time. Using counting machines is helpful in the lab environment where time is better spent in activities other than manually counting, and where accuracy is of extreme importance. The downsides of using counting machines include expense and potentially limited functionality of the device, beyond simple counting purposes.Learn more about Biology
One of the only decomposers that is able to survive in the desert is bacteria because they are tiny and can survive in the air. Other decomposers, such as millipedes, earth worms and beetles, also live in the desert, but they have a difficult time surviving because they depend on moist areas.Full Answer >
Biochemical tests are the quickest and easiest tests for identifying bacteria because they use deductive principles to reduce the number of possible species present very quickly. Additionally, because bacteria are microorganisms, visual identification is not always possible, and is never easy. Genetic testing is possible for some well-known bacteria, but it is expensive and time consuming.Full Answer >
Humans cannot see, smell, or taste individual micro-organisms such as bacteria, protozoa and certain fungi and algae. Such living organisms are microscopic and too small to be seen without magnification instruments (they were first observed by Anton van Leeuwenhoek in 1675).Full Answer >
Spirilla bacteria are Gram-negative bacteria that may cause bacterial diarrhea, adenocarcinoma and peptic ulcers.These bacteria are one of several varieties of bacteria that cause illness or disease in humans; mycoplasmas, chlamydiae, spirochetes and mycobacteria are other virulent and potentially destructive organisms. Spirilla bacteria are identified by their unique body shapes, which resemble spiral pasta noodles, and the type of physical harm that they cause to humans.Full Answer >