Left, wet mount examination. Right, trichrome stain. These cells are often mistaken by inexperienced microscopists as amoebic cysts. The fact that the areas taken up by the nucleus ...

Principle The test organism is inoculated into tryptone broth, a rich source of the amino acid tryptophan. Indole positive bacteria such as Escherichia coli produce tryptophanase, ...

 

 

Principle The blood mixed with anticoagulant is placed in a long capillary tube and centrifuge . the level reached by the column of erythrocytes is read with a scale reader . this ...

Some bacteria produce hemolysins, exotoxins that cause red blood cells (RBC’s) to burst open (hemolyse).When these bacteria are cultured on blood agar, this hemolysis is visible ...

– size :10-18 microns -nucleus: round or oval , N/C ratio is 50-65% , dark purple with coarser chromatin, usually no nucleolus . – cytoplasm : pink with prominent red-purple ...

Trophozoites of Trichomonas vaginalis are pyriform and 7-30 µm long. They have five flagella: four anteriorly directed flagella and one posteriorly along the outer membrane of the ...

Cysts of Iodamoeba buetschlii vary from being nearly spherical to ellipsoidal, and measure 5-20 µm. Cysts contain a single nucleus that is not visible in either unstained or iodine-stained ...