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Topic: Bacterial growth

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In the News (Tue 22 Jan 19)

  Growth of Bacterial Populations
The Laboratory of Bacterial Pathogenesis and Immunology, Rockefeller University.
The exponential phase of growth is a pattern of balanced growth wherein all the cells are dividing regularly by binary fission, and are growing by geometric progression.
Studying the growth of bacterial populations in batch or continuous cultures does not permit any conclusions about the growth behavior of individual cells, because the distribution of cell size (and hence cell age) among the members of the population is completely random.
textbookofbacteriology.net /growth.html   (2317 words)

 Bacterial growth - Wikipedia, the free encyclopedia
Bacterial growth is process in which two clone daughter cells are produced by the cell division of one bacterium.
The measurement of an exponential bacterial growth curve was traditionally a part of the training of all microbiologists.
An examination of the exponential growth of bacterial populations
en.wikipedia.org /wiki/Bacterial_growth   (415 words)

 Bacterial growth on stream insects: potential for use in bioassessment   (Site not responding. Last check: 2007-10-09)
Growth of filamentous bacteria (Sphaerotilus sp., Leptothrix sp.) on aquatic insects was evaluated for its usefulness as a bioindicator of detrimental nutrient levels in streams.
Field measurements of insect abundance, nutrient concentrations, and incidence/ degree of bacterial growth on insects upstream and downstream of livestock pastures were made in 2 Virginia, USA streams.
Bacterial growth on aquatic insects appears to be a reliable bioindicator of nutrient enrichment, and the degree of infestation associated with reduced insect survival can be quickly detected in the field or laboratory using a hand lens (10 to 15X magnification).
www.srs.fs.usda.gov /pubs/viewpub.jsp?index=112   (509 words)

 Bacteria - Wikipedia, the free encyclopedia
The bacterial cell is bound by a lipid membrane, or plasma membrane, which encompasses the contents of the cell, or cytoplasm, and acts as a barrier that holds nutrients, proteins and other essential molecules within the cell.
Bacterial cell walls are composed of peptidoglycan (called Murein in older sources), are are thus different from the cell walls of plants and fungi which have cell walls of cellulose and chitin, respectively.
Bacterial metabolism can be divided broadly on the basis of the kind of energy used for growth, electron donors and electron acceptors and by the source of carbon used.
en.wikipedia.org /wiki/Bacterial   (4222 words)

 Introduction :: Microbiology and Bacteriology :: The world of microbes
Bacterial cells carry out thousands of reactions leading to the generation of energy and the synthesis of cell components.
On an individual cell basis, growth can be defined as a summation of these processes or an orderly increase in cell constituents and structures with this ultimately leading to cell division as one cell becomes two.
Filamentous growth is common in the actinomycetes and fungi.Actinomycetes are spore-forming microbes that have a life-style and appearance that is similar to that of the fungi, yet they are bacteria.
www.bact.wisc.edu /Microtextbook/modules.php?op=modload&name=Sections&file=index&req=viewarticle&artid=9&page=1   (1489 words)

 Microbial Growth
The standard bacterial growth curve describes various stages of growth a pure culture of bacteria will go through, beginning with the addition of cells to sterile media and ending with the death of all of the cells present.
Exponential growth is a physiological state marked by back-to-back division cycles such that the population doubles in number every generation time.
A very tough, dormant form of certain bacterial cell that is very resistant to desiccation, heat, and a variety of chemical and radiation treatments that are otherwise lethal to non-endospore bacterial cells.
www.mansfield.ohio-state.edu /~sabedon/biol2025.htm   (2779 words)

 Control of microbes :: Microbiology and Bacteriology :: The world of microbes   (Site not responding. Last check: 2007-10-09)
The object of microbial control can range from complete eradication of microorganisms to the mere inhibition of their growth, and the goal of the treatment will influence the control method chosen.
It has the drawback that it is time consuming and the growth of germinated spores can alter the medium, possibly making it unsuitable for its intended purpose.
In fact, microorganisms are well preserved in liquid nitrogen (-196C) and this is a common method of preserving bacterial strains in research laboratories.
www.bact.wisc.edu /microtextbook/ControlGrowth/resistance.html   (2568 words)

 Bacterial growth
The number of mutants is estimated by taking a sample of the culture, growing it on a selective environment, that only supports the growth of the mutants, and counting the number of colonies.
One issue which is not addressed in their study, is the assumption that the cells were in exponential growth over the whole period of the experiment.
The distribution of mutants in the final culture can be obtain from the convolution of the distribution at the end of exponential expansion and the hypergeometric distribution, corresponding to the sampling realized by the death process.
www.santafe.edu /~mihaela/thesis/node46.html   (512 words)

 Bacterial nutrition, growth and energy metabolism
Bacterial requirements for growth include sources of energy, "organic" carbon (e.g.
In either case plotting the log of turbidity or number of living cells versus time is referred to as the growth curve.
The hydrogen is added to pyruvate and, depending on the bacterial species, a variety of metabolic end-products are produced.
pathmicro.med.sc.edu /fox/nutrition.htm   (1013 words)

 Heterotrophic Bacterial Growth Efficiency and Community Structure at Different Natural Organic Carbon Concentrations -- ...
Growth of bacterioplankton and consumption of dissolved organic carbon in the Sargossa Sea.
Bacterial utilization of dissolved organic carbon (DOC) in coastal waters—determination of growth yield.
Bacterial growth in mixed cultures on dissolved organic carbon from humic and clear waters.
aem.asm.org /cgi/content/full/69/7/3701   (5408 words)

 Bacterial Protein Toxins
At a chemical level, there are two types of bacterial toxins, lipopolysaccharides, which are associated with the cell walls of Gram-negative bacteria, and proteins, which are released from bacterial cells and may act at tissue sites removed from the site of bacterial growth.
Bacterial protein toxins are the most powerful human poisons known and retain high activity at very high dilutions.
Diphtheria toxin is a bacterial exotoxin of the A/B prototype.
textbookofbacteriology.net /proteintoxins.html   (2998 words)

 eMedicine - Prostatitis, Bacterial : Article by Edward David Kim, MD, FACS   (Site not responding. Last check: 2007-10-09)
Chronic bacterial prostatitis may be difficult to eradicate because of the persistence of bacteria within the prostatic acini.
Unlike patients with acute bacterial prostatitis, these patients are not acutely ill. Urine culture shows no growth unless the patient develops an acute urinary tract infection, in which case culture would demonstrate the same spectrum of organisms as in acute bacterial prostatitis.
Significant bacterial growth is present in the voided urine from the presence of an accompanying cystitis.
www.emedicine.com /MED/topic1920.htm   (3767 words)

 US FDA/CFSAN - Bad Bug Book - Factors Affecting the Growth of Microorganisms in Foods   (Site not responding. Last check: 2007-10-09)
A food may start with a pH which precludes bacterial growth, but as a result of the metabolism of other microbes (yeasts or molds), pH shifts may occur and permit bacterial growth.
The rate of growth at extremes of temperature determines the classification of an organism (e.g., psychrotroph, thermotroph).
The optimum growth temperature determines its classification as a thermophile, mesophile, or psychrophile.
vm.cfsan.fda.gov /~mow/app3.html   (674 words)

 Microbiology -- Growth   (Site not responding. Last check: 2007-10-09)
During active bacterial growth, the increase in cell numbers doubles with each cycle of replication
The turbidostat is used to establish continuous cultures, feeding fresh medium in and removing old spent medium and cells based on the turbidity of the number of cells in the culture.
When conditions for growth are favorable, the endospore gives rise to a fully functional vegetative cell in a process called germination.
nsm1.utdallas.edu /bio/gonzalez/lecture/micro/growth.htm   (1067 words)

 growth   (Site not responding. Last check: 2007-10-09)
draw a growth curve and explain what is occuring during the growth cycle of a bacterial population in batch culture
Growth yield is the amount of cells produced at end of exponential growth
Draw and label a typical bacterial growth curve in batch culture.
biology.fullerton.edu /biol302/growth.html   (323 words)

 Effects of Methylprednisolone on Intracellular Bacterial Growth -- Meduri et al. 8 (6): 1156 -- Clinical and Vaccine ...
of bacterial growth in the presence of cytokines for Escherichia
growth was enhanced in a dose-dependent manner (13, 21).
Growth responses of coliform bacteria to recombinant bovine cytokines.
cdli.asm.org /cgi/content/full/8/6/1156   (4352 words)

 Bacterial Growth: Constant Obsession with dN/dt -- Neidhardt 181 (24): 7405 -- The Journal of Bacteriology   (Site not responding. Last check: 2007-10-09)
of nongrowth is not the absence of the physiology of growth.
Study of growth cultivates in the investigator an integrationist perspective.
Finally, the overarching context for the growth physiologist must be the ecological one: the cell in its natural environment.
jb.asm.org /cgi/content/full/181/24/7405?view=full&pmid=10601194   (2982 words)

 Oxygen-Controlled Bacterial Growth in the Sponge Suberites domuncula: toward a Molecular Understanding of the Symbiotic ...
Oxygen-Controlled Bacterial Growth in the Sponge Suberites domuncula: toward a Molecular Understanding of the Symbiotic Relationships between Sponge and Bacteria -- Müller et al.
Growth curve of the sponge surface-associated bacterium SB2 in M9 minimal medium supplemented with 4 mM protocatechuate (Pca), 10 mM glucose (Glc), or 4 mM Na-benzoate (Ben); exponential phase, 3 to12 h; stationary phase, 12 to 24 h; decline, after 24 h.
Molecular response of the sponge Suberites domuncula to bacterial infection.
aem.asm.org /cgi/content/full/70/4/2332   (7028 words)

 Bacterial Growth in the Boys' and Girls' Living Envrionments of Peabody Hall
If there was low bacterial growth on the heavily stroked half of the plate and none on the lightly stroked half than it received a score of 1.
If there was high bacterial growth on the heavily stroked side but none on the lightly stroked side it received a score of 2.
The growth of molds and fungi in the samples were not expected to the extent that they occurred, and the technique in the experiment was not prepared to account for them in the data.
jrscience.wcp.muohio.edu /nsfall01/FinalArticles/BacterialGrowthintheBoysa.html   (2613 words)

 CHAPTER #4: BACTERIAL NUTRITION AND ENVIR. REQUIREMENTS   (Site not responding. Last check: 2007-10-09)
Unhindered growth, of course, requires unlimited nutrient supply and an unchanging environment, however, in real life this is impossible.
The growth in human population causes an increase in the number of cancer cases when we look at it as a progression, as cancer genes seem to be inherited: if population grows, the number of cancer cases grows respectively
For example some bacteria that are found in milk hardly make any of their own basic organic molecules, that is they let the cow (or more to the point the #microbes that live in the cow's gut) make these things for them.
www.slic2.wsu.edu:82 /hurlbert/micro101/pages/Chap4.html   (2042 words)

 Effects of Carbon Dioxide on Bacterial Growth Parameters in Milk as Measured by Conductivity -- Martin et al. 86 (6): ...
Effects of Carbon Dioxide on Bacterial Growth Parameters in Milk as Measured by Conductivity -- Martin et al.
Influence of carbon dioxide on the growth of spoilage bacteria.
The inhibition by carbon dioxide of the growth and metabolism of microorganisms.
jds.fass.org /cgi/content/full/86/6/1932   (4010 words)

 Amazon.com: Bacterial Growth And Form: Books: A.L. Koch   (Site not responding. Last check: 2007-10-09)
Based on the author's more than 40 years experience, Bacterial Growth and Form examines such important questions as what bacteria were, what they are, and what they do.
The book illustrates this point by closely examining the basic mechanismof hydrostatic or turgor pressure: how it functions for many of the mechanical purposes in the prokaryote, how it leads to mechanisms for resisting turgor pressure, and how it ultimately led to the development of exoskeletons and endoskeletons, and to the refinement of bacteria.
Bacterial Growth and Form brings together biochemical, biophysical, and physiological principles in an authoritative, single-source volume.
www.amazon.com /Bacterial-Growth-Form-L-Koch/dp/0412028719   (897 words)

 Activity 5: Bacterial Growth
Students will grow bacterial colonies and then determine the effectiveness of disinfectants in killing the bacteria.
Many disease-causing bacteria respond to treatment by antibiotics, which are used to kill or slow the growth of bacteria.
Remind students not to remove the cover of the disk while observing the bacterial colonies, and to wash their hands well after the investigation.
www.accessexcellence.org /RC/AB/WYW/wkbooks/SFTS/activity5.html   (669 words)

 Bacterial Growth: Page 17/30   (Site not responding. Last check: 2007-10-09)
Two mathematical parameters are commonly used to define the growth of a bacterial culture:
During the exponential (or logarathmic) growth phase, a bacterial culture mimics a first-order chemical reaction, i.e.
By measuring the increase in the number of cells during a certain time period, the growth rate constant (µ) can be calculated.
www-micro.msb.le.ac.uk /LabWork/bact/bact17.htm   (198 words)

 Bacterial Growth and Multiplication.
Scientists who study bacteria try to create the optimum environment in the lab: culture medium with the necessary energy source, nutrients, pH, and temperature, in which bacteria grow predictably.
LAG PHASE: Growth is slow at first, while the "bugs" acclimate to the food and nutrients in their new habitat.
coli, given a suitable environment for growth, divide and form a colony of hundreds of bacteria in just a few hours.
www.cellsalive.com /ecoli.htm   (256 words)

 Inhibition of translation and bacterial growth by peptide nucleic acid targeted to ribosomal RNA -- Good and Nielsen 95 ...
Inhibition of translation and bacterial growth by peptide nucleic acid targeted to ribosomal RNA -- Good and Nielsen 95 (5): 2073 -- Proceedings of the National Academy of Sciences
Inhibition of translation and bacterial growth by peptide nucleic acid targeted to ribosomal RNA
bacterial growth on agar plates and in liquid culture.
www.pnas.org /cgi/content/full/95/5/2073   (2423 words)

 Bacterial Growth
The water will maintain a constant level of humidity (100%) in the incubator.
Caution: When disposing of unwanted bacterial colony plates, you must first autoclave them.
This will kill the bacteria, and make the plates safe for disposal in a regular trash bag.
polymer.bu.edu /ogaf/html/chp51exp2.htm   (1218 words)

 Bacterial Growth Requirements
Requirements for microbial growth are divided into two categories, physical and chemical.
in both of the foregoing situations, regulating the amount of oxygen present represents a means of controlling growth or the rate of growth of the microbes; e.g.
Miscellaneous Growth factors not all kinds of organisms require the same nutrients nor can any one organism use all kinds 1.
www.angelfire.com /de/nestsite/micro7.html   (459 words)

 Bacterial Growth Rate Over Time   (Site not responding. Last check: 2007-10-09)
When freshly growing cells are diluted into fresh medium, of correct temperature etc. it will take a time before they grow at their maximum logarithmic growth rate (that rate depends on the medium and growth conditions).
We use bacteria to demonstrate this because their generation time is every 20 minutes instead of about 25 years as in humans.
It takes a while for there to be noticeable growth, this is called the lag time.
www.newton.dep.anl.gov /askasci/mole00/mole00405.htm   (494 words)

 Role of Glutathione Metabolism of Treponema denticola in Bacterial Growth and Virulence Expression -- Chu et al. 70 ...
Role of Glutathione Metabolism of Treponema denticola in Bacterial Growth and Virulence Expression -- Chu et al.
of growth, the optical density at 660 nm (OD) was approximately
Bacterial invasion of gingiva in advanced periodontitis in humans.
iai.asm.org /cgi/content/full/70/3/1113   (3722 words)

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