In this article we will discuss about the determination of LC50 and LD50 of toxicants. Determination of LC50: Different procedures are adopted depending on the size of the organisms subjected to a toxicant. Mosquito Larvae (Test Animal): Four 1000 ml glass beakers are half-filled with tap water/tank water. A measured amount of toxicant-liquid/solid—is thoroughly mixed with water in three beakers—1, [...]
In this article we will discuss about the structure of different parts of animal cells. 1. Mitochondrion: (Fig. 39.1) 1. Ovoid or cylindrical in shape. 2. Number and size of mitochondria variable. 3. Cavity of mitochondrion divided into a number of cristae. 4. Both the walls of the mitochondrion and cristae formed of double lipoprotein membrane. 2. Golgi Apparatus: (Fig. [...]
In this article we will discuss about the structure of different organs of Mammalia. 1. Skin (Vertical Section) Mammalia: (Fig. 41.1) The skin consists of two layers; an outer epidermis and a deeper dermis. A subcutaneous layer of loose connective tissue is present beneath the dermis. 1. Epidermis, a stratified, keratinized epithelium. It has two layers: A. Stratum corneum, the [...]