Enterobacteriaceae

In the world of microbiology, it is known to be gram negative, it does not hold the violet dye in testing. It is both aerobic and anaerobic. In other words, it is a facultative anaerobe. It belongs to the genus Salmonella and the family Enterobacteriaceae and named after a veterinarian Daniel E. Salmon. Interestingly enough, Salmonella Typhi infects only humans. It thrives in unsanitary conditions and reaches humans through feces…

Serratia genre includes Gram negative rod- shape bacteria, aerobe facultative anaerobe and chemo-oganotrophic with low nutrional requirements. According to Bergey’s Manual of Systematic Bacteriology, Serratia genre belongs to the Enterobacteriaceae family and includes 12 species 1,2. They are widespread in the natural environment, being isolated from soil, water and different plants (vegetables, mushrooms, grasses, mosses, trees)1,2,3. Serratia marcescens grows at 37°C, but it can grow in…

the spread of ABR across borders. Also explained by Barlam and Gupta, they have given statistics that say, “ESBL Enterobacteriaceae increased from 9% pre-travel to 33.6% post-travel, while quinolone-resistance genes qnrB and qnrS increased from 6.6% and 8.2% pre-travel to 36.9% and 55.7% post-travel, respectively” (15). This means that the specific bacteria stated, Enterobacteriaceae, has a relation with the genes listed because they both increased when the tourist traveled compared to the…

Experimental trials were performed by students over a timeframe of three weeks to determine the identity of three unknown bacteria contained in broth medium stored in labeled test tubes that were randomly assigned containing: one Gram positive bacterium, one Gram-negative paracolon, and one Gram-negative coliform (Carson, 2016). The unknown sample assigned in this experiment was #19. After initially streaking the solution on clean streak plates and TSA agar, the identity was determined from a…

Enterobacter spp. Enterobacter spp are part of the enterobacteriaceae family. They are facultative anaerobic gram negative bacilli. Their means of motility is by means of petrichous flagella. They produce acid upon glucose fermentation and are methyl red negative, voges-proskauer positive. Optimal growth temperature is 30*C .80% are encapsulated. E. spp have been associated with nosocomial outbreak and are opportunistic pathogens. They can cause numerous infections such as cerebral abscess,…

Biochemical Unknown I. Introduction Cultural Characteristics or morphology and biochemical tests can be used to identify and classify microorganism. By culturing microorganism in nutrient broth, slants, and on nutrient agar plates, the cultural characteristics or morphology can be determined. In this lab, the test tube 2 was incubated in a nutrient broth. The pigmentation of the tube was yellow. The media for test tube 2 was turbid. There were a few sediment on the bottom of the broth. In…

Unknown #30 1a. Glucose fermented. 2a. Sulfur reduced. 3a. Lactose fermented…………………………………………Citrobacter freundii 3b. Lactose not fermented 4a. Sucrose fermented…………………………………….Proteus vulgaris 4b. Sucrose not fermented………………………………Proteus mirabilis 2b. Sulfur not reduced. 5a. Lactose fermented. 6a. Sucrose fermented. 7a. Ornithine decarboxylase present……Enterobacter aerogenes 7b. Ornithine decarboxylase not present…….Klebsiella pneumonia 6b. Sucrose not…

Escherichia, which is named after Theodor Escherich, a German pediatrician. E. coli is usually found in the colon of mammals, explaining the name “coli” meaning from the colon. It’s classified in the order of enterobacteriales, and the family of enterobacteriaceae. It is the most abundant bacteria in the gastrointestinal tract of humans and other mammals. “Most strains are harmless, colonizing the intestines of healthy humans and animals, where they suppress the growth of pathogenic bacterial…

Ancient DNA • Summary: Ancient DNA is DNA that has been extracted extinct specimens. It can be used to study evolution and genomic consequences of long term environmental change. We can make species un-extinct by using the ancient DNA and then use this DNA to fertilize an embryo. However, the technology to do this is not available yet as no species have had their full genome sequenced. In addition, it is hard to find a surrogate to create an individual from this DNA. Ancient DNA is used today…

Silver nanoparticles have unique antimicrobial properties. They have a variety of applications: diagnostics, wound healing, pharmaceuticals, etc. These nanoparticles destroy bacterial cells walls and interrupt membrane integrity by their electrostatic attraction to the negatively charged bacterial cell walls [10]. Metal nanoparticles are usually synthesized by chemical techniques which is costly and highly toxic. Currently, there is a growing demand for alternative methods that would limit the…