In this study, two methods were used to measure the carbonation depth of coconut fibre-reinforced mortars that prepared from Portland cement (PC) and calcium sulfoaluminate (CSA cement), including traditional phenolphthalein reagent thermogravimetric analysis (TGA). Accelerated was conducted at 4% CO2 concentration, temperature 20 °C 65% relative humidity (RH) within 12 weeks. Complete detected...

The chemical tests for blood currently in use depend upon the detection of hemoglobin or one of its derivatives [1]. Hemoglobin has several properties which make it suitable for this purpose. The most important, due to its sensitivity, is the peroxidase activity of hemoglobin heme which forms the basis of the benzidine, leuco-malachite green, phenolphthalein, and luminol tests for blood. The lu...

1. Dextrose is not in itself injurious but rather favorable to toxin production. When added in quantities not exceeding 0.2 per cent to peptone bouillon freed from fermentable acid-producing substances (muscle sugar) it leads to a maximum accumulation of toxin by utilizing the available peptone to the best advantage. 2. The different courses taken by cultures of diphtheria bacilli in ordinary u...

A new acid -base indicator which is less hazardous and inexpensive is proposed. It is capable of d istinguishing between the acids and bases. Titrations were carried out to ensure that the proposed indicator yields quantitative results. The results of titrations were quite satisfactory. The indicator was giving a distinct sustained colour even in the case of weak base and weak acid titrations. ...

Preliminary communication. s The paper will appear shortly in Science, New York, N. S., 1918. All the precautions mentioned in this account were carefully observed in the present investigation. 3 The methods previously used in studying the photosynthesis of aquatic plants are not as accurate as the one here described, nor do previous experiments afford the kind of data needed for our purpose. C...