Abstract: In a vacuum degassing and decarburization treatment, the present invention uses a CO.sub.2 gas as a recirculating gas and as a stirring gas without inviting stoppage of decarburization and an increase in the carbon concentration and moreover, without an increase in the amount of addition of an alloy, and can reduce the gas cost. The present invention provides a production method for a low carbon molten steel which comprises blowing a CO.sub.2 gas from the start of degassing treatment till the carbon concentration of the molten steel reaches 50 ppm in vacuum degassing and decarburization treatment of the molten steel, and thereafter blowing an Ar gas.

Abstract: A treating agent of molten steel according to the present invention is used for desulfurization molten steel for desulfurizing it in a reaction vessel which is lined with a basic refractory containing MgO, and consists of CaO, CaF.sub.2 and MgO and unavoidable impurities contains from 10 to 60% by weight of MgO, and has a weight ratio of {(% CaF.sub.2)/((% CaO)+(% CaF.sub.2))}.times.100(%) of from 20 to 80%.Said agent is injected with the aid of inert carrier gas into the molten steel and floats toward a portion of the molten steel bath essentially free of slag. Another treating agent essentially consisting of CaO and CaF.sub.2 may be also injected prior and/or subsequent to injection of said agent, so as to decrease inclusions. The inert gas may also be injected after injection of said agent(s).

Abstract: A blood sugar analyzer has a reaction cell which houses a fixed enzyme membrane and measuring electrode and which receives a blood specimen, to cause a chemical reaction between the specimen and membrane for measuring the blood sugar concentration in the specimen on the basis of the reaction current generated in the electrode by the reaction. The analyzer also monitors the temperature in the cell and the sensitivity of the electrode, and a printer prints out data on the temperature and sensitivity. A digital control device controls overall operation of the analyzer.

Abstract: A process of calibrating a blood sugar analyzing apparatus, in which the blood sugar concentration in a blood specimen is measured with a fixed enzyme membrane sensor and corrected by calibration means, said blood sugar analyzing apparatus providing a linear relationship between measured and actual blood sugar concentrations in a range of blood sugar concentrations which are lower than a predetermined blood sugar concentration, and producing a deviation from said linear relationship in a range of blood sugar concentrations higher than said predetermined blood sugar concentration, in that said process comprises the steps of effecting a plurality of measurements of standard solutions having known low blood sugar concentrations in said blood sugar analyzing apparatus, obtaining an average value of the results of the measurements with said calibration means, determining a first correction coefficient (k.sub.

Abstract: A blood sugar analyzing apparatus has a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode which receives a blood specimen which causes a chemical reaction between the blood specimen and said fixed enzyme membrane for measuring the blood sugar concentration in the specimen on the basis of a reaction current signal generated in the sensor by the chemical reaction. The analyzing apparatus has a microcomputer for calculating a conversion coefficient used for converting the reaction current into a blood sugar concentration value by introducing a standard solution having a known blood sugar concentration, for storing data representing the value of said conversion coefficient, for calculating a blood sugar concentration value of a test specimen based upon the stored conversion coefficient value and reaction current from the test specimen. A display and printer provide a read-out of the blood sugar concentration value obtained.

Abstract: A blood sugar analyzer system for measuring the blood sugar concentration level in a blood specimen is provided. A sensor having a fixed enzyme membrane and a measuring electrode generates a reaction current proportional to the blood sugar level of the specimen, and a sampling mechanism samples the sensor output at regular intervals. A memory receives data from the sampling and divides the data into a group of new data and a group of old data. A calculating mechanism calculates the average value of each group, and the difference between the averages. When the difference exceeds a predetermined value, the latest sensed data value is selected as the rising point of the chemical reaction between the fixed enzyme membrane of the sensor and the blood sugar of the specimen.