The decomposition of endrin in hexane solutions under the sun light were investigated. A main photolysis product (III) was found out by means of the thin-layer chromatography and the electron capture gas chromatography. It was cleared that this substance was the same as one of the spots which were yielded by ultraviolet irradiation of endrin in hexane solution. The photolysis product was isolated, using silicagel column, and its chemical structure was elucidated by infrared spectrophotometry, nuclear magnetic resonance and mass-spectrometry. Also, in this study, 1, 8-exo-9, 10, 11, 11-hexachloropentacyclo [6, 2, 1, 1^{3, 6}, 0^{2, 7}, 0^{4, 10}] dodecan-5-one (II) was synthesized and it was assumed that a photolysis product (III) may be formed through the compound (II) under the sun light.

抄録全体を表示

The influences of developer vapour on thin-layer and dry-column chromatography of several hypnotics were investigated. Experiments on silicagel thin-layer and dry-column chromatography using a developer consisted of 2-propanol, chloroform and ammonia (or water) revealed that the developer vapour induced a modification of the activity of silicagel. A comparable separation by thin-layer and dry-column chromatography was attained by saturation with the developer vapour (or ammonia) or use of silicagel treated with Na₂CO₃ solution.

抄録全体を表示

Determination of an extractable hazardous component from plastic containers or instruments is made by two different methods in the test of the "Specifications and Standards of Containers and Packages, " provided by the Ministry of Health and Welfare. One is the method for containers, into which the extract is filled, and the other is for instruments such as films that are immersed in the extract. In both methods, the amount of the extracted substances is determined per 1000 ml of the extract. In these cases, the ratio of the volume of extract to the surface area of containers is not constant. In fact, it was ascertained that the amount of the extracted substances is not proportional to the volume of the extract but to the surface area. Now we propose that the amount of the extracts should always be determined per unit surface area. For this purpose, a simple and practical method is required for measuring the surface area of various containers, and the authors recommended here a new method, named "Sand gravimetric method." The internal surface of the container is coated with glycerol as thinly as possible, and then covered uniformly with sea sand (80-100 mesh). The surface area can be determined by weighing the sand stuck on glycerol, as the sand weight will be proportional to the surface area. This method is a very accurate and convenient way to determine the surface area of various solids, and is applicable for determination of that of glazed potteries or enamelled vessels for foodstuff.

抄録全体を表示

Disposable polystyrene and polypropylene syringes (Jintan Co.) and needles, which were stored for 24 months after irradiation with ⁶⁰Co γ-ray at 3 M rad for the purpose of sterilization, were subjected to sterility test and various function test, such as load test, fluid tightness test and test of solubility into physiological saline solution. There were no bacterial recontamination on samples and no detrimental effects on the functions of polystyrene or polypropylene syringes. It was observed that, in a certain polypropylene material, the irradiation causes a slight colouring and brittleness due to decrease of molecular weight. It is suggested, therefore, that a suitable selection of material must be important to apply the radiation sterilization technology for disposable medical supplies.

抄録全体を表示

Air pollution in Ogaki City has been studied for more than five years. Measurement on the variation of SO₃ and NO₂ value was performed at more than thirty places, and the hourly variation of the gases was tested at some places. It was found that air pollution in this city was mainly caused by two sources, one of which was two factory areas in southern and western districts, and another was cars running on the National Road Route 21. It was proved that pollutants discharged from the factories are both sulfur dioxide and hydrogen sulfide, and those from cars are nitrogen oxides, and their concentrations were makedly high. Polluted areas were altered with the wind direction and the main wind direction in this city is between north and west, so the polluted areas are unchanged through all seasons. It was also found that correlation exists between the concentration of sulfur dioxide and the direction of wind.

抄録全体を表示

The Japanese official method for alkaline phosphatase in milk is Sanders-Seger's method which is so complicated that it can be hardly practised in daily routine. Accordingly, milk technicians hope to have a more simple procedure. The method using p-nitrophenyl phosphate as a substrate was ascertained to be simple and practicable. By means of this method, the presence of raw milk can be easily detected, even when it was diluted 1000-2000 times with pure water. The reagent is composed of 100 ml of buffer solution (Na OAc, NaCl, MgSO₄ and barbital Na) and 1.5 mg of sodium p-nitrophenyl phosphate. To discriminate yellow coloration due to the presence of alkaline phosphatase, 1 ml of this reagent is added to 1 ml of the sample for testing.

抄録全体を表示