What is the morphology of Alcaligenes?

MICROSCOPIC APPEARANCE

Gram Stain:	Negative.
Morphology:	Coccal or cocci.
Size:	0.5 – 1.0 micrometers by 0.5 – 2.6 micrometers.
Motility:	Motile with peritrichous flagella.
Capsules:	No.

Where is Alcaligenes found?

Natural habitat. Alcaligenes are found in soil and water and are common inhabitants of the intestinal tracts of some animals.

What shape is Alcaligenes faecalis?

Alcaligenes faecalis is a species of gram-negative, rod-shaped, aerobic bacteria commonly found in the environment.

What color is Alcaligenes faecalis?

Bacteria Collection: Alcaligenes faecalis Additional Information

Enzyme Tests Text:	Beta-galactosidase : -,Lecithinase / alpha : –
Temperature For Growth Text:	at 37°C : Yes
Colony Appearance Text:	smooth : Yes,shiny : Yes
Colony Color Text:	white : Yes
Colony Text:	convex : Yes,entire : Yes,irregular : Yes

Is a faecalis Gram positive or negative?

Alcaligenes faecalis is a Gram-negative catalase- and oxidase-positive, motile rod. It is commonly found in a watery environment and is rarely isolated from humans.

What is the colony morphology of E coli?

Traditionally, the colony morphology of Escherichia coli is identified as either a rough or a smooth form. The two forms are readily distinguished, as the colonies of the former are rough, flat, and irregular and colonies of the latter are smooth, high, and circular.

Is E coli Gram-positive or negative?

Escherichia coli (E. coli) is a Gram-negative, rod-shaped, facultative anaerobic bacterium. This microorganism was first described by Theodor Escherich in 1885.

What diseases are caused by Alcaligenes faecalis?

faecalis has been associated with endocarditis, bacteremia, meningitis, endophthalmitis, skin and soft tissue infections, urinary tract infections, otitis media, peritonitis, and pneumonia [1, 2, 7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28]. A.

Why Bacillus subtilis is Gram-positive?

Bacillus subtilis, known also as the hay bacillus or grass bacillus, is a Gram-positive, catalase-positive bacterium, found in soil and the gastrointestinal tract of ruminants and humans. …

Bacillus subtilis
Phylum:	Firmicutes
Class:	Bacilli
Order:	Bacillales
Family:	Bacillaceae

How common is Alcaligenes faecalis?

faecalis were less than 50%. Conclusions: The most frequent Alcaligenes faecalis infection sites, in order, are the bloodstream, urinary tract, skin and soft tissue, and middle ear. The susceptibility rate of Alcaligenes faecalis to commonly used antibiotics is decreasing.

How do you identify Alcaligenes faecalis?

faecalis is a Gram-negative bacterium which appears rod-shaped and motile under a microscope. It is positive by the oxidase test and catalase test, but negative by the nitrate reductase test. It is alpha-hemolytic and requires oxygen.

Is Proteus vulgaris Gram positive or negative?

Proteus vulgaris Proteus vulgaris is an facultative anaerobe, rod-shaped, Gram-negative bacterium in the Enterobacteriaceae family. It causes urinary tract and wound infections.

Is Pseudomonas aeruginosa Gram positive or negative?

Pseudomonas aeruginosa is a Gram-negative rod measuring 0.5 to 0.8 μm by 1.5 to 3.0 μm. Almost all strains are motile by means of a single polar flagellum, and some strains have two or three flagella (Fig.

Does a faecalis reduce nitrate?

faecalis could reduce nitrate and nitrite under aerobic conditions with electrodes as the electron donor, and the current densities were low (<0.02 mA/cm²).

Is a faecalis urease positive?

Escherichia coli and Enterococcus faecalis are commonly considered urease-negative bacteria.

What antibiotic kills Enterococcus?

If the organism is susceptible, ampicillin is the drug of choice. Vancomycin can be used if the organism is ampicillin-resistant. Linezolid or quinupristin/dalfopristin are reasonable alternatives if the enterococcus is resistant to both ampicillin and vancomycin.

Are streptococci Gram-positive?

Streptococci are Gram-positive, nonmotile, nonsporeforming, catalase-negative cocci that occur in pairs or chains. Older cultures may lose their Gram-positive character.

What antibiotic treats Enterococcus faecalis?

Ampicillin is the preferred antibiotic used to treat E. faecalis infections. Other antibiotic options include: daptomycin.

What is the color of Escherichia coli?

Escherichia coli is a coliform lactose fermenter. It forms blue-black colonies with a metallic greenish sheen. The color of E. coli colonies on eosin- methylene blue agar according to Mahon appears blue-black.

How do you identify E. coli?

coli bacteria are among the few species of lactose (LAC)-positive, oxidase-negative, gram-negative rods that are indole positive. Due to the infrequent isolation of non-E. coli strains that are indole positive, the spot indole test has been used for the rapid, presumptive identification of E. coli.

What are the basic categories of colony morphology?

Colony morphological characteristics may be viewed with the naked eye, a hand lens, a stereo (dissecting) microscope, or a colony counter (Fig. 2.3). The seven basic categories include colony size, shape, margin (edge), surface, elevation, texture, and optical properties (Fig.

What are the major differences between Gram positive and Gram negative bacteria?

Gram positive bacteria have a thick peptidoglycan layer and no outer lipid membrane whilst Gram negative bacteria have a thin peptidoglycan layer and have an outer lipid membrane.

How is E. coli gram stained?

E. coli is described as a Gram-negative bacterium. This is because they stain negative using the Gram stain. … The staining technique distinguishes between two main types of bacteria (gram positive and gram negative) by imparting color on the cells.

What color is Gram negative bacteria?

Alternatively, Gram negative bacteria stain red, which is attributed to a thinner peptidoglycan wall, which does not retain the crystal violet during the decoloring process.

What kind of bacteria is Spirilla?

A spirillum (plural spirilla) is a rigid spiral bacterium that is Gram-negative and frequently has external amphitrichous or lophotrichous flagella. Examples include: Members of the genus Spirillum. Campylobacter species, such as Campylobacter jejuni, a foodborne pathogen that causes campylobacteriosis.

What is Alcaligenes faecalis resistant to?

Alcaligenes faecalis is generally resistant to aminoglycosides, chloramphenicol and tetracyclines and usually susceptible to trimethoprim–sulfamethoxazole and β-lactam antibiotics such as ureidopenicillins, ticarcillin–clavulanic acid, cephalosporins and carbapenems.

Why is Alcaligenes faecalis important?

Alcaligenes faecalis is a Gram-negative, rod-shaped bacterium with flagella, and belong to the family of Alcaligenaceae. Particularly in immunosuppressed people, the opportunistic pathogen may trigger local infections, including peritonitis, meningitis, otitis media, appendicitis, and bloodstream infection.

What does it mean when something is Gram-positive?

Gram-positive bacteria are bacteria with thick cell walls. In a Gram stain test, these organisms yield a positive result. The test, which involves a chemical dye, stains the bacterium’s cell wall purple. Gram-negative bacteria, on the other hand, don’t hold the dye.

What diseases are caused by Bacillus subtilis?

Infections attributed to B. subtilis include bacteremia, endocarditis, pneumonia, and septicemia. However, these infections were found in patients in compromised immune states.

What Colour is Gram-positive?

The staining method uses crystal violet dye, which is retained by the thick peptidoglycan cell wall found in gram-positive organisms. This reaction gives gram-positive organisms a blue color when viewed under a microscope.