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Enterobacteria phage T4. Escherichia virus T4 is a species of bacteriophages that infect Escherichia coli bacteria. It is a double-stranded DNA virus in the subfamily Tevenvirinae of the family Straboviridae. T4 is capable of undergoing only a lytic life cycle and not the lysogenic life cycle.
Iodine is an essential trace element in biological systems. It has the distinction of being the heaviest element commonly needed by living organisms as well as the second-heaviest known to be used by any form of life (only tungsten, a component of a few bacterial enzymes, has a higher atomic number and atomic weight ).
The polio virus is 30 nm in diameter. [ 1] Transmission electron microscopy ( TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons ...
Streptococcus thermophilus formerly known as Streptococcus salivarius subsp. thermophilus[ 2][ 1] is a gram-positive bacterium, and a fermentative facultative anaerobe, of the viridans group. [ 3] It tests negative for cytochrome, oxidase, and catalase, and positive for alpha-hemolytic activity. [ 3] It is non-motile and does not form ...
Leydig cells, also known as interstitial cells of the testes and interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle and produce testosterone in the presence of luteinizing hormone (LH). [ 1][ 2] They are polyhedral in shape and have a large, prominent nucleus, an eosinophilic cytoplasm, and numerous ...
Frozen section procedure. The frozen section procedure is a pathological laboratory procedure to perform rapid microscopic analysis of a specimen. It is used most often in oncological surgery. [ 1] The technical name for this procedure is cryosection. The microtome device that cold cuts thin blocks of frozen tissue is called a cryotome.
v. t. e. Scanning probe microscopy ( SPM) is a branch of microscopy that forms images of surfaces using a physical probe that scans the specimen. SPM was founded in 1981, with the invention of the scanning tunneling microscope, an instrument for imaging surfaces at the atomic level. The first successful scanning tunneling microscope experiment ...
The mainstay of malaria diagnosis has been the microscopic examination of blood, utilizing blood films. [ 1] Although blood is the sample most frequently used to make a diagnosis, both saliva and urine have been investigated as alternative, less invasive specimens. [ 2] More recently, modern techniques utilizing antigen tests or polymerase ...