Online microbiology and biology related notes by SAGAR ARYAL
Classification of Fungi Fungi are eukaryotic microorganisms. They can occur as yeasts, molds, or as a combination of both forms. Some fungi are capable of causing superficial, cutaneous, subcutaneous, systemic or allergic diseases. Yeasts are microscopic fungi consisting of solitary cells that reproduce by budding. Molds, in contrast, occur in long filaments known as hyphae, … Read moreClassification of Fungi
Scope and Applications of Microbiology Scope of Microbiology Microorganisms are present everywhere on earth which includes humans, animals, plants and other living creatures, soil, water and atmosphere. Microbes can multiply in all three habitats except in the atmosphere. Together their numbers far exceed all other living cells on this planet. Microorganisms are relevant to all … Read moreScope and Applications of Microbiology
Fields of Microbiology Microbiology is one of the most applied of all the biological sciences which did not exist as a true science before the later part of 19th century. It is defined as the study of microorganisms that is the organisms which are of microscopic dimensions and too small to be clearly perceived by … Read moreFields of Microbiology
Pour Plate Technique- Procedure, Significance, Advantages, Limitations In nature, microbial populations do not segregate themselves by species, but exist with a mixture of many other cell types. In the laboratory, these populations can be separated into pure cultures. These cultures contain only one type of organism and are suitable for the study of their cultural, … Read morePour Plate Technique- Procedure, Significance, Advantages, Limitations
Streak Plate Method- Principle, Methods, Significance, Limitations In microbiology, streaking is a technique used to isolate a pure strain from a single species of microorganism, often bacteria. The dilution or isolation by streaking method was first developed by Loeffler and Gaffky in Koch’s laboratory, which involves the dilution of bacteria by systematically streaking them over the exterior of the agar in a Petri dish to … Read moreStreak Plate Method- Principle, Methods, Significance, Limitations
Bacterial Growth and Factors Affecting Growth of Bacteria With respect to humans, the term growth refers to an increase in size; for example, going from a tiny newborn baby to a large adult. Although bacteria do increase in size before cell division, bacterial growth refers to an increase in the number of organisms rather than an … Read moreBacterial Growth and Factors Affecting Growth of Bacteria
Bacterial growth curve and its significance When a broth culture is inoculated with a small bacterial inoculum, the population size of the bacteria increases showing a classical pattern. When plotted on a graph, a distinct curve is obtained referred to as the bacterial growth curve. Method of Obtaining Bacterial Growth Curve A population growth curve for … Read moreBacterial growth curve and its significance
The Germ Theory of Disease Before the Germ theory of disease, the causes suggested for the occurrence of disease were the effect of supernatural phenomena like planetary alignments, effect of bad bodily humors and the faulty environment. For example, in ancient Greece, it was thought that disease was spread not via direct contact with other … Read moreThe Germ Theory of Disease
Classification of Bacteria Bacteria are classified and identified to distinguish one organism from another and to group similar organisms by criteria of interest to microbiologists or other scientists. The classification of bacteria serves a variety of different functions. Because of this variety, bacteria may be grouped using many different typing schemes. The grounds for the classification commonly used … Read moreClassification of Bacteria
Five Kingdom System of Classification- Features and Limitations Taxonomy refers to the science of classification of living organisms. According to Bergey’s Manual of Systematic Bacteriology, taxonomy consists of three separate but interrelated areas: classification, nomenclature, and identification. Classification is the arrangement of organisms into taxonomic groups known as taxa on the basis of similarities or … Read moreFive Kingdom System of Classification- Features and Limitations