Biochemical Studies On Nutrition Under Special Environment : I. An Apparatus Capable Of Keeping The Reduced Pressure Constant

1. The description has been made of an apparatus capable of keeping the reduced pressure constant for quite some duration. 2. Observations of factors governing the control of constant reduced pressure have shown that the variation of reduced pressure can be maintained within 0.7 mm. mercury by controlling the number of contacts in the regulation of manometer to over 30 per 20 minutes. 3. Experiments have shown that locating the magnetic valve close to the pressure-regulator and minimizing the number of air reservoirs are important for the accurate regulation of reduced pressure

A Study On A New Acidic Compound Isolated From Volatile Portion Of A Green Alga, Ulva Pertuosa

1) A new acidic compound which is named as ulvaic acid has been isolated from steam distillate of Ulva pertuosa. 2) The molecular formula of the crystalline reduced ulvaic acid has been determined to be C18H36O3. 3) Two modifications exist for the reduced ulvaic acid. One of them might be an isomer or a preexisting staturated compound similar to ulvaic acid

The Change In Ascorbic Acid Content Of Porphyra Tenera Due To Ecological And Processing Conditions

1. An appreciable change in ascorbic acid was not noticed during the growth of Porphyra. 2. The diurnal change in ascorbic acid was not appreciable. 3. A freshly collected Porphyra, when preserved in water having pH values of 5.8-9.8 and salinity values higher than 18% did not show the decrease in ascorbic acid content. When preserved at temperatures above 20℃, the content of ascorbic acid decreased somewhat after 3 hours, but decreased to a great extent after 12 hours. 4. The ascorbic acid content of Porphyra shows almost no change on being preserved in a dry atmosphere. 5. It has been pointed out that the extent of the decrease during the preservation in a humid atmosphere is enough to account for the discorcant values of ascorbic acid of dried Porphyra. Evidences have been presented that the change will most probably take place due to a combined action of humidity and the ascorbic acid oxidase

Biochemical Studies On Nutrition Under Special Environment : II. The Effect Of Reduced Pressure Upon Digestibility

1. By exposing albino rats to reduced pressure, an appreciable decrease has been noticed in the digestibility of solid as well as the nitrogenous matter of diet containing fish meal or milk powder as protein-source. 2. No decrease, by exposing to reduced pressure, has been observed in the digestibility of diet containing a mixture of peptone and amino acids. 3. By keeping the test animal under reduced pressure for two hours daily, peptone can be utilized 8.7% more efficiently than the protein of milk and 16.6% more efficiently than the protein of fish meal. 4. These experimental findings give credence to the presumption that the secretion of digestive enzymes, especially proteolytic, may decrease in appreciable amount only by keeping the specimen under reduced pressure for two hours