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Bacterial growth curve\Kinetic Curve. In autecological studies, the growth of bacteria (or other microorganisms, as protozoa, microalgae or yeasts) in batch culture can be modeled with four different phases: lag phase (A), log phase or exponential phase (B), stationary phase (C), and death phase (D).
Bacteria (/ b æ k ˈ t ɪər i ə / ⓘ; sg.: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
The bacterial cell cycle is divided into three stages. The B period occurs between the completion of cell division and the beginning of DNA replication. The C period encompasses the time it takes to replicate the chromosomal DNA. The D period refers to the stage between the conclusion of DNA replication and the end of cell division. [30]
Chlamydia trachomatis is a gram-negative bacterium that can replicate exclusively within a host cell, making it an obligate intracellular pathogen. [3] Over the course of its life cycle, C. trachomatis takes on two distinct forms to facilitate infection and replication.
The bacterial life cycle does not necessarily include sporulation. Sporulation is usually triggered by adverse environmental conditions, so as to help the survival of the bacterium. Endospores exhibit no signs of life and can thus be described as cryptobiotic .
Bdellovibrio life cycle. The Bdellovibrio attaches to a gram-negative bacterium after contact, and penetrates into the prey's periplasmic space. Once inside, elongation occurs and progeny cells are released within 4 hours. [6] Bdellovibrio cells can swim as fast as 160 μm/s, or over 100 times their body-length per second.
The life cycle of bacteriophages tends to be either a lytic cycle or a lysogenic cycle. In addition, some phages display pseudolysogenic behaviors. [13] With lytic phages such as the T4 phage, bacterial cells are broken open (lysed) and destroyed after