Bacterial growth


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Bacterial growth

The processes of both the increase in number and the increase in mass of bacteria. Growth has three distinct aspects: biomass production, cell production, and cell survival. Biomass production depends on the physical aspects of the environment (water content, pH, temperature), the availability of resources (carbon and energy, nitrogen, sulfur, phosphorus, minor elements), and the enzymatic machinery for catabolism (energy trapping), anabolism (biosynthesis of amino acid, purines, pyrimidines, and so forth), and macromolecular synthesis [proteins, ribonucleic acid (RNA), and deoxyribonucleic acid (DNA)]. Cell production is contingent on biomass production and involves, in addition, the triggering of chromosome replication and subsequent cell division. The cells may or may not separate from each other, and the division may partition the cell evenly or unevenly. Alternatively, growth may occur by budding (unequal division). Most cells so produced are themselves capable of growing and dividing; consequently, viability is usually very high when growth conditions are favorable. Moreover, in many cases the incidence of death is surprisingly low in the absence of needed nutrients. Many bacteria differentiate into resistant resting forms (such as spores); others may simply reduce their rate of metabolism and persist in the vegetative state for long times.

References in periodicals archive ?
Food poisoning is an acute illness that occurs when bacteria, viruses or other germs are absorbed by food substances consumed by people," Dr Alessai explained, adding that bacterial growth in food is likely to occur when food is not kept cold enough.
Cooked leftovers should be moved to the freezer within two hours to prevent bacterial growth.
Douching will only cover up the smell and reduces the acidity of vaginal ph thereby setting the stage for bacterial growth.
Sodium lactate inhibited bacterial growth for two weeks in turkey and 12 weeks in bologna.
In this experiment, two pieces of meat -- one salted and one unsalted -- will help determine whether bacteria grow on meat in microgravity and if salt mitigates bacterial growth in microgravity.
The company announced the glass at the CES event and said that the EPA-registered antimicrobial cover glass constitutes ionic silver into its structure at 'precise levels' to curb the bacterial growth due to everyday wear and tear.
The durable textile effect is designed to control bacterial growth and absorb odors.
8226; Great detail given to every component on the machine from the sanitary large impeller down to the types of fasteners, threads, washers, and nuts used throughout the product contact/cutting zone to discourage bacterial growth and assist in cleaning practices.
Understanding the mechanisms controlling bacterial cell growth and shape is of tremendous importance in any area where we seek strategies for controlling bacteria, be it for the eradication of pathogens from the human body or the improvement of bacterial growth in bioremediation and industrial processes," VanNieuwenhze explains.
Although compounds were not able to completely inhibit bacterial growth at 200 peg/ml, the SLs do altered biofilm formation, elastase activity, and production of N-acyl-homoserinelactones (AHLs) which are known quorum sensing autoinducers at lower concentration.
According to Ron Smith, horticulturist at North Dakota State University Extension Service, the oils from the herbs inhibit bacterial growth and suppress sprouting.
Martin Smith of Synbiosis stated: "With recent outbreaks of food poisoning in Europe associated with salad products, research into what triggers bacterial growth is critical