Abstract: In a mastitis progression data memory 80 there is previously recorded data on the corresponding relationship between the state of progression of mastitis caused by bacteria and the trace light intensity chemically emitted by phagocytic leukocytes in milk when they phagocytose the bacteria, the trace light intensity chemically emitted by the phagocytic leukocytes in the milk is detected by a photodetector 41a, the state of progression of mastitis corresponding to the light intensity is diagnosed by an extractor/converter 13 with reference to the mastitis progression data memory 80 based on the detected trace light intensity, and the diagnosed state of progression of mastitis is outputted by output means 30. It is possible to conveniently and reliably diagnose the state of progression of mastitis from invasion of bacteria up to severe mastitis.

Abstract: The invention provides an efficient and reliable method for extinguishing fire of a chlorosilane compound, which is a notoriously dangerous inflammable material in respect of the difficulty of extinguishment of fire thereof, by sprinkling a specific porous inert silica based or silica-alumina based powder defined by the content of silica or overall content of silica and alumina as well as various parameters as a powdery material followed by spraying an aqueous solution of sodium chloride, potassium chloride or calcium chloride. The fire extinguishing efficiency can be further enhanced when the sprinkled powder is a blend of the above defined porous powder and a specific silica sand in a specific proportion. When the sprinkled powder is such a binary blend, considerably good results can be obtained even by omitting the step of spraying of the aqueous salt solution.

Abstract: The invention provides a rapid and reliable method for extinguishment of fire on a chlorosilane compound such as trichlorosilane which is hardly extinguishable once set on fire by any conventional fire-extinguishing methods. The inventive method comprises sprinkling an inert siliceous powder composed of porous particles of specified silica or silica-alumina content having a specified particle diameter, pore diameter and porosity over the surface of the burning chlorosilane compound. The efficiency of fire-extinguishment can further be enhanced when sprinkling of the porous siliceous powder is followed by spraying of water or a highly halogenated hydrocarbon compound, e.g., monobromo monochloromethane and carbon tetrachloride, over the siliceous powder.