A Modified Capillary Microrespirometer

A New Form of Differential Microrespirometer

1. A microrespirometer suitable for measuring oxygen uptakes from 0.1 to 10lambda per hour is described. 2. The sensitivity of the instrument may be readily altered by substituting different sizes of capillary tubing. 3. By means of replaceable brass plugs the chamber volume of this instrument may be varied from 700 to less than 40lambda. 4. No thermostat is required for the operation of the in...

A Versatile Microrespirometer for Routine Use

A new design of microrespirometer suitable for routine laboratory work has been described.

A Simplified Differential Microrespirometer

Study of Some Enzyme Systems by Means of the Differential Microrespirometer

Three enzymic phenomena, inactivation by oxygen, Q(OO2) measurements of a dehydrogenase system, and hydrolysis of acetyl phosphate by a phosphatase of Clostridium kluyveri, were studied by means of the differential microrespirometer. Respiration of yeast cells was also measured with the same instrument. All results obtained in the four types of study agreed closely with earlier results obtained...

The Oxygen Consumption of the Microspores of Trillium in Relation to the Mitotic Cycle

The oxygen consumption of 265 single Trillium erectum anthers was measured before and during the mitotic cycle of the microspores using a modified differential microrespirometer. The results show a rising oxygen consumption of the anther in the premitotic stages followed by a sharp drop immediately preceding and during active division. It is suggested from these results that active division may...