Eukaryotic cells are organisms or cells that have a membrane-bound nucleus. They are distinct group of organisms that have a unit membrane-enclosed nucleus and other organelles such as the mitochondria that are membrane-bound . They are different from prokaryotic cells which lack membrane-bound nucleus. The term eukaryote is derived from the Greek word eu which […]
Microbial cells employ a variety of mechanisms to uptake nutrients (including macromolecules, inorganic ions, water and other small molecules) from their natural environment or from artificially prepared cultured media which are precisely designed to provide all the essential nutritional requirements and growth factors necessary for microbial or bacterial growth. The cell wall or outer covering
Mechanisms for uptake of nutrients by microorganisms – diffusion & active transport Read More »
Microbial Physiology & Metabolism, General Microbiology
Living organisms vary in terms of their mode of nutrition i.e. how they feed or obtain their food. Some organisms are known as autotrophs because they can manufacture their own food; and examples include green plants and green algae. Autotrophs use carbondioxide (CO2) as their sole source of carbon for growth. Plants contain chlorophyll which
NUTRITIONAL GROUPS OF MICROORGANISMS Read More »
General Microbiology, Microbial Physiology & Metabolism
Bacterial Nutritionis importantfor the optimum growth of the organism because it is the only means by which the organism can acquire all necessary materials required for its cellular biosynthetic activities as well as for the generation of energy (i.e. adenosine triphosphate, ATP). Nutrients are substances required for energy production and other biosynthetic activity necessary for
Microbial (Bacterial) Nutrition Read More »
Microbial Physiology & Metabolism, General Microbiology
Prokaryotic cells are microbial cells that have chromosomes that are not separated from the cytoplasm by a membrane. Prokaryotic cells are different from eukaryotic cells. They are cells that lack a nucleus and other membrane-enclosed organelles like mitochondrion and chloroplast et cetera. Thus everything inside the cell of a prokaryote is openly accessible within the
PROKARYOTIC CELLS Read More »
Microbial Physiology & Metabolism, Bacteriology
The cell as we know is the basic unit of life. Microorganisms are cellular entities, and thus could be likened to a cell. They can either exist as unicellular organisms or organisms with multiple cells (i.e. as multicellular organisms). Microbial cells are ubiquitous in the natural environment, and are found in the soil, water, in
TYPES OF MICROBIAL CELLS Read More »
Microbial Physiology & Metabolism
Viable cell count: Viable cell count gives an estimate of the total number of living cells present in a given volume of a sample. Viable cell count can be determined by automated machines and with the use of counting chambers such as the haemocytometer (Figure 1) in the microbiology laboratory. Haemocytometers are routinely used in
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Microbe Lab, Microbial Physiology & Metabolism, Techniques in Microbiology Lab
The cells of all living organisms share several structural characteristics together. Some of the many structural components of a cell (which co-ordinates the cells activities and their functions) are as follows: NUCLEUS Nucleus is the control center of the eukaryotic cell that contains deoxyribonucleic acid (DNA). DNA is the genetic material of the cell which
PARTS OF A CELL AND THEIR FUNCTIONS Read More »
Microbial Physiology & Metabolism
Cell theory is the scientific hypothesis that the cell is the basic unit of life found in all living organisms. It holds a fundamental concept in the study of biology. Cell theory describes the properties of cells – which are the basic unit of structure in all living organisms. The cell is also the basic
A cell is simply defined as the basic structural and functional unit of life. It is the smallest component of all forms of life including microbial cells. The cell was first discovered by Robert Hooke (1635-1703)in 17th century. Robert Hooke was the first scientist who used the microscope to describe the cells of living organisms
