Simple population modeling in a spreadsheet
... a) Develop a spreadsheet model that calculates the bacterial population of a petri dish over a period of 12 hours. Use k=0.5 /hr, xmax =1.0 million, ∆ t=1 hr, and the initial value x(0)=0.5 million bacteria in your model. Use the example calculations above to verify your work. b) Insert a chart into ...
... a) Develop a spreadsheet model that calculates the bacterial population of a petri dish over a period of 12 hours. Use k=0.5 /hr, xmax =1.0 million, ∆ t=1 hr, and the initial value x(0)=0.5 million bacteria in your model. Use the example calculations above to verify your work. b) Insert a chart into ...
Nitrogen Cycling - MrPfancooksWIKI
... Nitrogen Fixation by Bacteria • Special bacteria are responsible for creating most of the Nitrates plants need. • Bacteria nodules form on the roots of legumes (beans, peas, alfalfa) to supply them with usable nitrogen • Excess nitrates move into the soil to help other plants ...
... Nitrogen Fixation by Bacteria • Special bacteria are responsible for creating most of the Nitrates plants need. • Bacteria nodules form on the roots of legumes (beans, peas, alfalfa) to supply them with usable nitrogen • Excess nitrates move into the soil to help other plants ...
Prokaryotes - Bakersfield College
... Multicellular Associations • Biofilms – Associations of one or more microorganisms • Cells secrete – signaling molecules to attract nearby cells – proteins that help the cells attach to substrate and to each other – chains of polysaccharides that trap other microorganisms and form 3-D structure ...
... Multicellular Associations • Biofilms – Associations of one or more microorganisms • Cells secrete – signaling molecules to attract nearby cells – proteins that help the cells attach to substrate and to each other – chains of polysaccharides that trap other microorganisms and form 3-D structure ...
Document
... 6. The following question refers to the bacterium's' flagellum. Which is correct answer? a. Every flagellum originates from a basal body b. Only gram positive have flagellum c. Using electronic microscope you can detect self movement d. Bacteria with a single flagellum can move in only one directio ...
... 6. The following question refers to the bacterium's' flagellum. Which is correct answer? a. Every flagellum originates from a basal body b. Only gram positive have flagellum c. Using electronic microscope you can detect self movement d. Bacteria with a single flagellum can move in only one directio ...
Endosymbiotic Theory
... Their DNA sequences are very similar to those of green algae—further supporting the hypothesis that an ancestral eukaryote engulfed a green algae. ...
... Their DNA sequences are very similar to those of green algae—further supporting the hypothesis that an ancestral eukaryote engulfed a green algae. ...
LECTURE # 1
... eubacteria: bacteria, ricketssia, mycoplasma, chlamydia Main classification of bacteria is Bergey’s Manual, which include Two division: 1.cyanobacteria (cyanophyta) Water-plants 2.true bacteria which include 19 parts. Main of them represent: Bacteria ( rod-like, cocci) (aerobic and anaerobic), (endo ...
... eubacteria: bacteria, ricketssia, mycoplasma, chlamydia Main classification of bacteria is Bergey’s Manual, which include Two division: 1.cyanobacteria (cyanophyta) Water-plants 2.true bacteria which include 19 parts. Main of them represent: Bacteria ( rod-like, cocci) (aerobic and anaerobic), (endo ...
A model of human karyotype for - Journal of Clinical Pathology
... Gram-positive and Gram-negative bacteria, with the structure of the mucopeptide, or 'glycosaminopeptide', component that is present in the walls of almost all bacteria and is responsible for their rigidity, and with the occurrence and structure of the teichoic acids. A chapter on cell-wall antigens ...
... Gram-positive and Gram-negative bacteria, with the structure of the mucopeptide, or 'glycosaminopeptide', component that is present in the walls of almost all bacteria and is responsible for their rigidity, and with the occurrence and structure of the teichoic acids. A chapter on cell-wall antigens ...
Growth Curve (four phases)
... Heterotrophs: This group of bacteria has a simpler set of enzymes so they must use organic carbon for growth. ...
... Heterotrophs: This group of bacteria has a simpler set of enzymes so they must use organic carbon for growth. ...
Introduction to Prokaryotic Organisms
... where living conditions are unfavorable to most organisms. Some Archaea live in association with deep sea floor hydrothermal vents and tolerate extreme pressures as well as high temperatures. Recently certain Archae have been shown to survive being autoclaved. Because they maintain their activity un ...
... where living conditions are unfavorable to most organisms. Some Archaea live in association with deep sea floor hydrothermal vents and tolerate extreme pressures as well as high temperatures. Recently certain Archae have been shown to survive being autoclaved. Because they maintain their activity un ...
Document
... target and destroy certain structures that are only found in bacteria such as their peptidoglycan cell walls. Peptidoglycan is a polymer that makes up the cell walls of bacteria. Antibiotics also target certain proteins in bacteria that develop differently than proteins found in eukaryotic cells (St ...
... target and destroy certain structures that are only found in bacteria such as their peptidoglycan cell walls. Peptidoglycan is a polymer that makes up the cell walls of bacteria. Antibiotics also target certain proteins in bacteria that develop differently than proteins found in eukaryotic cells (St ...
The Scientific Method
... In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria grown in culture dishes. He noticed a mold called Penicillium also growing in some of the dishes. A clear zone existed around the mold. All the bacteria that had grown in the clear zone had died. In the culture dishes without mold, ...
... In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria grown in culture dishes. He noticed a mold called Penicillium also growing in some of the dishes. A clear zone existed around the mold. All the bacteria that had grown in the clear zone had died. In the culture dishes without mold, ...
Identification of Two Unknown Species of Bacteria
... staining or the slide may have been overheated during fixation (Gram Variable Bacteria). Alternatively, the age of the unknown cultures may have affected the outcome. The cell walls in an older culture are known to be more susceptible to decolorization, particularly those in the genus Bacillus (Rao) ...
... staining or the slide may have been overheated during fixation (Gram Variable Bacteria). Alternatively, the age of the unknown cultures may have affected the outcome. The cell walls in an older culture are known to be more susceptible to decolorization, particularly those in the genus Bacillus (Rao) ...
PharmacoDynamics
... ~Haploid (single) circular chromosome IN cytoplasm ~Cell walls of peptidoglycan ~Replicate by binary fission ~Includes bacteria & archea ~70S ribosome ~No mitochondria 2.) > name = “eu” (true) + “karyos” (nucleus) = true nucleus >Contain membrane bound organelles >Chromosomes physically separate fro ...
... ~Haploid (single) circular chromosome IN cytoplasm ~Cell walls of peptidoglycan ~Replicate by binary fission ~Includes bacteria & archea ~70S ribosome ~No mitochondria 2.) > name = “eu” (true) + “karyos” (nucleus) = true nucleus >Contain membrane bound organelles >Chromosomes physically separate fro ...
Basic Bacterial Culture and Identification
... during the previous class. You will use it to grow a lawn of tiny bacterial colonies. 3. Use the loop to distribute the bacteria completely over the surface of the agar. Where you previously needed to streak for isolated colonies, now you are streaking for maximum distribution over the surface of th ...
... during the previous class. You will use it to grow a lawn of tiny bacterial colonies. 3. Use the loop to distribute the bacteria completely over the surface of the agar. Where you previously needed to streak for isolated colonies, now you are streaking for maximum distribution over the surface of th ...
Bacteria - WordPress.com
... • Bacteria that cause disease are said to be pathogenic. – Only a tiny fraction of the bacterial species living on and in the human body is pathogenic. • Pathogenic bacteria tend to affect tissues at the body’s entry points, such as wounds or pores in the skin, the respiratory and gastrointestinal t ...
... • Bacteria that cause disease are said to be pathogenic. – Only a tiny fraction of the bacterial species living on and in the human body is pathogenic. • Pathogenic bacteria tend to affect tissues at the body’s entry points, such as wounds or pores in the skin, the respiratory and gastrointestinal t ...
Microbiology Lab Experiment Changes
... Work in groups (2-3 students). Each person in your group should do at least one plate. 1. Inoculate 2 or 3 different bacteria onto each kind of medium. ...
... Work in groups (2-3 students). Each person in your group should do at least one plate. 1. Inoculate 2 or 3 different bacteria onto each kind of medium. ...
20-2 PowerPoint Prokaryotes
... divides in half, producing two identical cells. This type of asexual reproduction is known as binary fission. During favorable conditions some bacteria can reproduce in 20 minutes. ...
... divides in half, producing two identical cells. This type of asexual reproduction is known as binary fission. During favorable conditions some bacteria can reproduce in 20 minutes. ...
Chapter19_Section03_jkedit
... tissue that cells become damaged. Mad cow disease may be caused by prions. ...
... tissue that cells become damaged. Mad cow disease may be caused by prions. ...
9a Metabolic Tests Enterics
... Adding methyl red to a grown culture turns red if acid was produced. The VP reagent is added to a grown culture in the presence of O2 and makes a red ring at the broth surface if acetoin is present (typical of Enterobacter bacteria). MRVP must be read within 24-48 hours as nearly all cultures become ...
... Adding methyl red to a grown culture turns red if acid was produced. The VP reagent is added to a grown culture in the presence of O2 and makes a red ring at the broth surface if acetoin is present (typical of Enterobacter bacteria). MRVP must be read within 24-48 hours as nearly all cultures become ...
Quiz #7 - San Diego Mesa College
... Q. 6: Which of the following is/are TRUE of members of the genus Pseudomonas? A) they are strictly anaerobic soil bacteria B) they are able to decompose a wide variety of organic compounds. C) they can become serious obligate intracellular parasites. D) they are known to form cysts when starved for ...
... Q. 6: Which of the following is/are TRUE of members of the genus Pseudomonas? A) they are strictly anaerobic soil bacteria B) they are able to decompose a wide variety of organic compounds. C) they can become serious obligate intracellular parasites. D) they are known to form cysts when starved for ...
Lecture 8: Probiotic Bacteria
... shrimp hatcheries in Ecuador since 1992 Reduced hatchery down time from 7 days per month to less than 21 days per year! FAO has now designated use of probiotics as a major means for improvement of aquatic environmental ...
... shrimp hatcheries in Ecuador since 1992 Reduced hatchery down time from 7 days per month to less than 21 days per year! FAO has now designated use of probiotics as a major means for improvement of aquatic environmental ...
Bacteria
Bacteria (/bækˈtɪəriə/; singular: bacterium) constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals. They are also known to have flourished in manned spacecraft.There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water. There are approximately 5×1030 bacteria on Earth, forming a biomass which exceeds that of all plants and animals. Bacteria are vital in recycling nutrients, with many of the stages in nutrient cycles dependent on these organisms, such as the fixation of nitrogen from the atmosphere and putrefaction. In the biological communities surrounding hydrothermal vents and cold seeps, bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. On 17 March 2013, researchers reported data that suggested bacterial life forms thrive in the Mariana Trench, which with a depth of up to 11 kilometres is the deepest part of the Earth's oceans. Other researchers reported related studies that microbes thrive inside rocks up to 580 metres below the sea floor under 2.6 kilometres of ocean off the coast of the northwestern United States. According to one of the researchers, ""You can find microbes everywhere — they're extremely adaptable to conditions, and survive wherever they are.""Most bacteria have not been characterized, and only about half of the phyla of bacteria have species that can be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology.There are approximately ten times as many bacterial cells in the human flora as there are human cells in the body, with the largest number of the human flora being in the gut flora, and a large number on the skin. The vast majority of the bacteria in the body are rendered harmless by the protective effects of the immune system, and some are beneficial. However, several species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy, and bubonic plague. The most common fatal bacterial diseases are respiratory infections, with tuberculosis alone killing about 2 million people per year, mostly in sub-Saharan Africa. In developed countries, antibiotics are used to treat bacterial infections and are also used in farming, making antibiotic resistance a growing problem. In industry, bacteria are important in sewage treatment and the breakdown of oil spills, the production of cheese and yogurt through fermentation, and the recovery of gold, palladium, copper and other metals in the mining sector, as well as in biotechnology, and the manufacture of antibiotics and other chemicals.Once regarded as plants constituting the class Schizomycetes, bacteria are now classified as prokaryotes. Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.