In this article we will discuss about:- 1. Meaning of Chemo-taxis 2. Demonstration of Chemo-taxis 3. Chemotactic Behaviour of Bacteria. Meaning of Chemo-Taxis: Chemo-taxis is the movement of bacteria towards chemical attraction and away from chemical repellants. Bacteria are attracted towards the nutrients such as sugars and amino acids, and are repelled by harmful substances and bacterial wastes. They also [...]
Like bacteria, the cell of cyanobacteria also consists of a mucilaginous layer called sheath, the cell wall, plasma membrane and cytoplasm. These are shown in Fig. 4.32 and described below: 1. Sheath: Usually the cell of cyanobacteria are covered by a hygroscopic mucilaginous sheath which provides protection to cell from unfavourable conditions and keeps the cells moist (Fig. 4.32). Thickness, [...]
The following points highlight photoautotrophs and chemoautotrophs types of microorganisms that are based upon the source of electron. Type # 1. Photoautotrophs: Photoautotrophs include the photosynthetic bacteria, algae and green plants. These organisms fix carbon utilizing the energy of solar radiations through a process called photosynthesis. They are also called the primary producers of simple procedures because such organisms are [...]