MEDICAL TECHNOLOGY

MYCOBACTERIUM TUBERCULOSIS DEFINITION

Mycobacterium tuberculosis is the bacterium that causes most cases of tuberculosis.

M. tuberculosis is an obligate aerobe (weakly Gram-positive mycobacterium, hence Ziehl-Neelsen staining (Acid-fast staining) is used). While mycobacteria do not seem to fit the Gram-positive category from an empirical standpoint (i.e., they do not retain the crystal violet stain), they are classified as acid-fast Gram-positive bacteria due to their lack of an outer cell membrane. Read the rest of this entry »

NEISSERIA GONORRHEAE DEFINITION
Neisseria gonorrhoeae, also known as Gonococci (plural), or Gonococcus (singular), is a species of Gram-negative kindney bean-shaped diplococci bacteria responsible for the sexually transmitted disease gonorrhoea. Read the rest of this entry »

SARCINA LUTEA SPECIMEN
Morphology:Gram (-) diplococci Read the rest of this entry »

Clostridium tetani is a rod-shaped, anaerobic bacterium of the genus Clostridium. Like other Clostridium species, it is Gram-positive, and its appearance on a gram stain resembles tennis rackets or drumsticks.[1] C. tetani is found as spores in soil or as parasites in the gastrointestinal tract of animals. C. tetani produces a potent biological toxin, tetanospasmin, and is the causative agent of tetanus. Read the rest of this entry »

A stratified epithelium consists of multiple layers of cells in which only the basal layer is attached to the basement membrane. A simple epithelium which appears to be stratified is classified as “pseudostratified” (the nuclei are in different layers, but all the cells are in contact with basement membrane). A stratified epithelium in which the number of cell layers varies upon physiological stretching is called “transitional“. Epithelial cells are classified by shape into squamous (flat), cuboidal and columnar varieties. The name of a stratified epithelium is determined from the shape of the apical layer of cells.
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Simple cuboidal eplithelia are epithelial cells with a cuboidal shape arranged in a single layer. Simple cuboidal epithelia is found on the surface of ovaries, the lining of nephrons, the walls of the renal tubules, and parts of the eye and thyroid.

On these surfaces, the cells perform secretion and absorption. Read the rest of this entry »