Actinomycetes belong to the group of prokaryotic, gram-positive bacteria those are having a filamentous structure. Its filamentous structure resembles the fungal mycelium, which consists of a highly dense and filamentous network. Due to the filamentous structure of actinomycetes, it is also termed as thread or ray bacteria. The cell wall and the internal structure of …
Endospore staining is a type of special staining method, which makes use of differential staining procedure to highlight the presence or absence of endospores. For the staining of endospores, the first article was published by Dorner in the year 1922. Later, the Dorner method of staining endospores has been modified by two scientists, Schaeffar and …
Capsule staining is one of the staining methods, which creates contrast in the microscopic image either by staining bacterial cells and background or staining the capsule only. Therefore, capsule staining can be done by two methods, namely positive and negative staining methods. Positive staining method either stain a capsule only or stain both the capsule …
Bacterial shape and arrangement vary from species to species. Bacteria exist in many forms, but the most common types are bacilli, cocci and spirilla. Some bacteria are pleomorphic, i.e. they live in variable shapes. Bacteria are prokaryotic cells as they have a primitive nucleus, i.e. bacteria devoid of a nucleus and a nuclear membrane that …
Simple staining is one of the conventional staining techniques. From the name, it is quite clear that it is a very simple or direct staining method that uses a single stain only. The microorganisms are invisible to the naked eye, and to make them visible, staining is performed that gives divergence to a microscopic image. …
Riboflavin or Vitamin B-2 belongs to the Vitamin-B group, which are of eight kinds viz. vitamin B-1, B-2, B-3, B-5, B-6, B-7, B-9, B-12. It plays a crucial role in converting and breaking down protein, fats, and carbohydrates to produce energy. Vitamin B-2 converts complex carbohydrates, proteins and fat into simple sugar, amino acids and …
Xanthophyll is a type of accessory pigment or phytochemicals, which belongs to the class of “Carotenoids”. In many vascular plants and algae, xanthophylls act as the light-harvesting protein complexes. Xanthophylls are rich in antioxidants, which prevent the cells from damaging. In photosynthetic eukaryotes, the xanthophylls are usually bound to the chlorophyll molecules. Xanthophylls are the …
Membrane filtration method is an alternative to the MPN method for the microbiological analysis of water. Sometimes, it also refers to as “Millipore filter technique” or “MF technique”. The Millipore filter technique was named by the two scientists Goetz and Tsuneishi in 1951. Membrane filtration method makes the use of membrane filter, or we can …
A most probable number method is practised for the qualitative and quantitative water to determine microorganisms’ presence (mainly coliforms). “MPN” is an acronym for most probable number. Multiple tube fermentation test or MPN method determines the quality of water by quantifying the number of coliforms in 100 ml of the water sample. MPN test involves …
The production of streptomycin requires the stock culture of Streptomyces griseus, proper nutrient medium and the other growth-promoting substances. Streptomycin is an antibiotic that shows a broad spectrum against the gram-negative bacteria and is the first antibiotic to cure TB. In 19th October 1943, a scientist Albert Schatz from the Rutgers University was the first …