Found
Gram-negative 22
times.

Displaying results 1 to 10.

1. AcetobacterAcetobacter is a genus of rod-shaped, flagellated or nonmotile gram-negativebacteria that oxidize ethanol to acetic acid . These bacteria are commonly found on fruits and vegetables, and although they are used commercially to produce vinegar (especially Acetobacter aceti), they're considered pests by brewers and vintners.

2. Agrobacterium tumefaciensAgrobacterium tumefaciens is a gram-negativebacterium found in soil which causes crown gall disease in plants (which causes tumor s to form at the crown and at the junction of the root and stem). The tumors are caused by the Ti plasmid in the bacterium; this plasmid is being heavily researched by plant genetic engineers because it is a useful way to introduce new genes into a plant cell.

3. Aztobacter (nitrogen-fixing bacteria)Aztobacter is a species of large, oval, aerobic gram-negative bacteria that can fix atmospheric nitrogen if they have an energy source (often a carbohydrate ) available.

5. ChlamydiaA genus of gram-negativebacteria which is a parasite living within the cell s of humans and other animals, causing a wide variety of diseases. In humans, they cause inclusion conjunctivitis and the venereal (sexually-transmitted) disease by the same name. This STD causes symptoms such as abnormal genital discharge and pelvic pain (in women), but often it produces no symptoms at all. If left untreated, it can cause pelvic inflammatory disease in women (which can lead to sterility and other problems) and, if transmitted during birth, can cause eye infections and pneumonia in newborns. It can be cured with antibiotics.

7. ColiformsA group of bacteria which live within the bowels of larger organism s and ferment a sugar called lactose, producing gas within 48 hours of growth. They are generally small, gram-negative, bacilliform (shaped like rods), facultative anaerobe s and they include strains such as Escherichia , Kelbsiella, Enterobacter, and Citrobacter. They are useful for measuring the amount of water pollution by feces.

9. Gram stainAn important method for staining bacteria developed by Christian Gram in 1884. The bacteria are placed as a smear on a slide, then air-dried, then stained first with crystal violet dye and then with Gram's iodine, then washed with 95% ethanol, flooded with safranin or fuchsin (red dyes) and air-dried again. If the bacteria retain the purple-blue stain on their cell walls, they're classified as Gram-positive; if they don't retain the crystal violet but take the red counterstain, they're gram-negative. This classification is important because the reaction to Gram stain correlates in many cases with the bacteria's vulnerability to certain antibiotic s. The process only takes a few minutes, making it ideal for medical clinics. If a clinician considers data from the Gram stain along with his/her medical examination of a sick patient, the clinician can get a pretty good idea of the pathogen that is infecting the patient and then start a regimen of antibiotics. In a clinical setting, the Gram stain is followed up by a bacterial culture (which takes three to six days to complete).