gram - negative describes bacteria that stains pink with gram stain.
gram - negative describes bacteria that stains pink with gram stain.
what term describes bacteria that stains pink with gram stain?
gram - negative
syphilis is a sexually transmitted disease that is brought upon by the gram negative bacteria, treponema pallidum. treponema pallidum are various spiral shaped motile bacteria of the family spirochaetacea. their genus features include spirochetes, which means that they are spiral with axial filaments (endoflagellum). these bacteria are poorly visible on gram stain, but they have a gram-negative envelope. some distinguishing features of the bacteria include a thin spirochete, which is not reliably seen on gram stain. the bacteria's outer membrane has endotoxin-like lipids. their axial filaments consists of endoflagella and periplasmic flagella. the creatures cannot be cultured in lab, and they are an obligate pathogen. humans are the only host for this bacteria, and the bacteria can get through the body by minute abrasions of the skin or mucous membranes. the reservoir is in the human genital tract, and its transmission is transmitted sexually or across the placenta.
meningeal syphilis
the "gram stain", developed in 1884 by hans christian gram, characterises bacteria based on the structural characteristics of their cell walls. the thick layers of peptidoglycan in the "gram-positive" cell wall stain purple, while the thin "gram-negative" cell wall appears pink. by combining morphology and gram-staining, most bacteria can be classified as belonging to one of four groups (gram-positive cocci, gram-positive bacilli, gram-negative cocci and gram-negative bacilli). some organisms are best identified by stains other than the gram stain, particularly mycobacteria or "nocardia", which show acid-fastness on ziehl–neelsen or similar stains. other organisms may need to be identified by their growth in special media, or by other techniques, such as serology.
bacteria