美国 Hausser scientific 血球计数板，霍华德霉菌计数板，准确计算白细
胞、红细胞、血小板、组织培养细胞、细菌和精子
l The Counting Chamber is of all glass construction. In the center of the slide is a rectangle 15 x 20 mm, which is flanked by shoulders on each side 0.1mm higher. The cover glass is supported on these shoulders and leaves a depth of 0.1mm between the underside of the cover glass and the rectangle. The rectangle and the cover glass have optically plane surfaces. To facilitate calibration of the microscope, the rectangle has two engraved parallel lines spaced 1.382mm apart.
l An accessory eyepiece micrometer is available which is ruled into squares, each of which is equal to 1/6 of the diameter of the eyepiece diaphragm opening. For mold counting, the microscope must give an area of 1.5 sq. mm.(circle 1.382 mm in diameter) at magnification of 90-125.
l TOMATO PRODUCTS
(NOT DEHYDRATED) #42.57
l In making mold counts of tomato products, use juice and catsup as it comes from the container. If necessary add clean, mold free, water-soluble gum to assist in making more uniform mounts; in case of puree and paste mix H2O to make total tomato solids of diluted
product 8.37-9.37%.
l Clean the Howard cell so that the Newton rings are produced between slide and cover glass. Remove cover glass and place small drop of well mixed sample upon central rectangle; using knife blade or scalpel,spread drop evenly over rectangle, and cover with glass so as to give an even spread. Use only sufficient sample to bring material to edge of rectangle. (It is of utmost importance that the drop be taken from a thoroughly mixed sample and spread evenly over rectangle. Otherwise,when cover slip is put in place, insoluble material, and consequently molds, may be more abundant at the center of mount). Discard any mount showing uneven distribution or absence of Newton rings, or liquid that has been drawn across moat and cover glass.
