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Bacteria display a large diversity of cell morphologies and arrangements. Bacterial cellular morphologies are the shapes that are characteristic of various types of bacteria and often key to their identification. Their direct examination under a light microscope enables the classification of these bacteria (and archaea).
A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells.. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.
Bacteria could be seen under microscope, and cultured on agar plates. In 1890, Louis Pasteur declared "tout virus est un microbe": "all infectious diseases are caused by microbes". In 1892, Dmitri Ivanovsky discovered that the cause of tobacco mosaic disease could pass through Chamberland's porcelain filter .
This illustration depicts a three-dimensional (3D), computer-generated image of a cluster of barrel-shaped, Clostridium perfringens bacteria. The artistic recreation was based upon scanning electron microscopic (SEM) imagery. In agar plate cultures bacteria with hypermotile variations like SM101 frequently appear around the borders of the colonies.
Bacteria grow to a fixed size and then reproduce through binary fission, a form of asexual reproduction. [112] Under optimal conditions, bacteria can grow and divide extremely rapidly, and some bacterial populations can double as quickly as every 17 minutes. [113] In cell division, two identical clone daughter cells are produced. Some bacteria ...
By Keith Morrison Taking the phrase of "putting it under the microscope" quite literally, the Nikon Small World contest recently announced its winners for 2014. Now in its 40th year, the contest ...
As the bacteria infect the host, the temperature of the host denatures the structure and allows translation initiation for the virulence genes. [citation needed] The majority of Listeria bacteria are attacked by the immune system before they are able to cause infection. Those that escape the immune system's initial response, however, spread ...
This bacteria often occur in large numbers within the lesions of lepromatous leprosy and are usually grouped together as a palisade. [6] By optical microscopy of host cells, Mycobacterium leprae can be found singly or in clumps referred to as "globi", the bacilli can be straight or slightly curved, with a length ranging from 1–8 μm and a ...