Abstract: An isolated mutated green fluorescent protein (gfp) gene for chromosomal insertion into a bacterium, wherein the gene is capable of being expressed in bacteria and produce sufficient fluorescence under illumination from a UV lamp in a bacterial colony to be seen by the naked eye. A gene cassette for inserting a gene into a chromosome.

Abstract: A flow cytometer capable of forming a drop containing two or more particles comprising: (a) means (38) for moving particles in a liquid flow stream (35); (b) detector or analyser means (46A, 46B) adapted to detect or analyse particles in the flow stream; (c) waste route (39) disposed down stream from the detector or analyser means for receiving waste liquid; (d) collection route (41) disposed downstream from the detector or analyser means for receiving collection liquid containing desired particles; (e) drop forming means for dispensing a drop containing two or more particles from the collection route; and (f) controlling means (42) for directing the liquid stream to the waste route or to the collection route.

Abstract: This invention relates to the field of internal quality control in diagnostic analysis, particularly in the analysis of microorganisms or other small particles, such as the detection of bacteria, protozoa, yeast, fungi, viruses, prions and the like, in water or other potable fluids, food, blood, urine, faeces, cerebro spinal fluid, and the like.