water moulds

The desired shape is got by mixing a powder with water or other binder and moulding the resulting plastic mas..

. Most of them are saprotrophic. Some are found as parasites on algae and other plants. Slime moulds generally reproduce asexually by fragmentation or by forming sporangia, which produces spores having a cellulose cell wall. Sexual reproduction involves isogamy or anisogamy. fig. 8.13 - S..

Protists can be broadly distinguished into three major groups, namely 1. Photosynthetic protists 2. Slime moulds and 3. Protozoan protis..

Have you ever tasted or smelt the fat/oil containing food materials left for a long time? This unpleasant change in the flavor and odour of a food is called rancidity. The most important cause of rancidity is the deterioration in fats and fatty foods because of oxidation process. When an oxygen a..

Polythene is formed by the addition polymerization of multiple monomers of ethylene or ethene. When liquid ethylene is polymerized at high temperature and pressure, a resin of polyethylene is obtained. It can be melted spun or moulded as desired. Note that in addition polymerization there..

Impure sulphur is heated in an iron retort. The sulphur vapors formed at 444 o C are allowed to escape in a large brick chamber. The vapors condense and form 'flowers of sulphur' on the walls of the chamber. After sometime when the temperature of the chamber rises up to 120 o C..

It is a white powder. When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression. The p..

antiseptic and germicide preservative for biological and anatomical specimens substitute for tanning in leather industry - This is because it can harden glue or gelatine and thus renders them insoluble in water reactant in the manufacture of formaldehyde resins like bakelite ..

The volcanic regions of Sicily have rocks containing about 25% of sulphur. Special types of kilns with air spaces are made on sloping hillsides. Powdered rocks containing sulphur are piled up on these brick kilns (Fig. 13.19..

It is a white powder. When mixed with water (1/3 of its mass), it evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression. The p..