. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Securing Food 35. x 32" x 11", with a door (not shown in figure) and back made of double glass panes with a 1 inch air space between them. The cabinet is con- structed of wood and insulated with celotex; the inside is painted white. Culture flasks are kept on wire shelves which rest on adjustable metal supports. A clearance of not less than % inch be- tween the edges of the shelves and the walls of the cabinet provides for better circulation of air.
. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Securing Food 35. x 32" x 11", with a door (not shown in figure) and back made of double glass panes with a 1 inch air space between them. The cabinet is con- structed of wood and insulated with celotex; the inside is painted white. Culture flasks are kept on wire shelves which rest on adjustable metal supports. A clearance of not less than % inch be- tween the edges of the shelves and the walls of the cabinet provides for better circulation of air. The upper shelf is occupied by the refrigeration unit (R) separated from the rest of the cabinet by a metal sheet which serves for collecting the condensation water, and also as a protection to the cultures placed just below it against excessive cold. The temperature is regulated by the air switch (A) connected to the electric re- frigeration machine (not shown in the diagram). To facilitate circulation of air a small electric fan (F) may be hooked up to the air switch. Experience shows, however, that when the refrigeration unit is in operation there is a sufficient circulation of air inside stand for iiiumina- the box. The temperature differences in the flasks tion of the diatom placed on various shelves do not exceed 20 C. and a temperature of from 150 to 160 C. may easily be main- tained in the cabinet when the room temperature does not exceed 22 ° C. If necessary the refrigeration unit may be disconnected and a heater, placed on the bottom shelf, turned on. The heating assembly consists of a small heater (H), fan (F), relay (E), and metastatic tem- perature controller (M). Equal illumination on both sides of the cabinet is provided by 18 Mazda 25 watt bulbs, mounted on two separate stands ~^ (Fig. 35) made of iron pipes and pro- vided with metal reflectors which are placed 3 feet from the glass walls. Under this constant, controlled illumination and temperature, Nitzschia
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
