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Gram negative bacteria and their diseases
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Clostridium tetani is a Gram-positive bacteria. Gram-positive bacteria retain a crystal violet stain in their thick peptidoglycan. C. tetani are bacillus-shaped organisms. Typically bacillus shaped organisms are shaped like rods, however, C. tetani, although bacillus, tend to have a drumstick-like shape. This drumstick shaping is due to terminal spores formed by the bacteria. Spores are dormant forms of an organism. The spores germinate and swell within the cell, imparting the bacteria’s drumstick shape.1 Clostridium tetani are also anaerobic, meaning that they cannot survive in the presence of oxygen. The organisms are very sensitive to heat, however, the spores that they produce can become rather resistant to heat and antiseptics.2 C. tetani spores are pervasive throughout nature. The natural habitat of C. tetani consists of areas that are damp and warm. Common sources for these bacteria include soil, manure, animal intestines, and feces.3 Generally, C. tetani spores can survive for months in their natural environment. However, under the proper environmental conditions, the spores can survive for years.4
Infection from C. tetani bacteria causes tetanus, a disease that affects the nervous system. The spores enter the host through open wounds.3 Many cells are dead at the wound site, which provides an ideal environment for the germination of more C. tetani spores. After entering the host, the bacteria releases a toxin, called tetanospasmin. The tetanospasmin is a peptide made out of two chains, one is a light chain while the other is heavy. The chains of this toxin produce inhibitors that bind to receptors and cause uncontrollable muscle contraction, which is a common symptom of tetanus. Tetanospasmin affects the human ne...
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...that the firecrackers left many injured. They reminded victims of the crackers to seek medical attention as soon as possible to help prevent tetanus. The providence was on an official “tetanus watch” raised by health officer, Dr. Aturdido Jr. Doctors from the South Cotabato hospital warned the public that if symptoms like cramps near affected area and fever occur within a few days after injury that they should seek nearest hospital for treatment. Dr. Aturdido noted that firecracker related incidents had increased in 2014 by 21%. This new years there were 104 cases compared to 2013’s 86 cases. Some of the explosives being used had explosive contents of 0.2grams, which was deemed too risky. The province of South Cotabato are going to try and regulate, and even ban the use of fire-crackers for next years celebration in hopes of reducing any further injuries.8
Clostridium difficile, otherwise known as C. diff, is a species of spore-forming, anaerobic, gram-positive bacteria that is known to cause watery diarrhea. 1 The genus name, Clostridium refers to the spindle shape of the organism while Difficile means difficult in Latin due to the fact that this organism thrives in unfavorable conditions and is very difficult to isolate.4 The incidence of getting CDI has increased over the years due to new strains of increased toxin production of the bacteria and increased resistance to antibiotics.2 It is a gastrointestinal infection, and the most common cause of infectious diarrhea.1 C. difficile was first identified in the feces of healthy newborns back in the 1930’s and by 1935, it was considered normal flora. 2 During 1974, researchers conducted that about 21% of patients that were treated with an antibiotic called clindamyacin reported diarrhea and about 10% of them reported to have conducted pseudomembranous colitis as a side effect of this treatment. 2 It was in 1978 where C. diff had been known to cause anti-biotic associated diarrhea and pseudomembranous colitis. 2 It is known to form spores that resist many disinfectants; it also survives for several months on different surfaces.1 It is a common form of a nosocomial infection and the prevalence of becoming infected with C. diff is about 0-15% in a health care setting. 3 The spores survive well in environments such as soil, water and animals and is distributed worldwide. 4 CDI produces two toxins (Toxin A and B), which are cytotoxic and cause tissue necrosis.4
The Gram positive bacteria has been nicknamed Posi. The Gram positive species’ morphology includes having an opaque opacity with a smooth margin. The moisture content of the Gram positive species is shiny and the pigmentation is gold. The Gram positive species grows at an optimal temperature of 37°C. The shape of the Gram positive species is a cocci, with an arrangement of grapelike clusters. The Gram positive species’ size ranges from .5-1.5 µm. Oxygen requirement of the Gram positive species is facultative, and has complete lysis of red blood cells. All results are summarized in Table
C. freundii is a non-spore forming, motile bacteria that are long rod-shaped with a typical length of 1-5 μm. The seven biochemical tests conducted to narrow down the gram-negative stain are Phe... ... middle of paper ... ... dentifying unknown bacteria are and its implications for humans and nature.
The purpose of this laboratory is to learn about cultural, morphological, and biochemical characteristics that are used in identifying bacterial isolates. Besides identifying the unknown culture, students also gain an understanding of the process of identification and the techniques and theory behind the process. Experiments such as gram stain, negative stain, endospore and other important tests in identifying unknown bacteria are performed. Various chemical tests were done and the results were carefully determined to identify the unknown bacteria. First session of lab started of by the selection of an unknown bacterium then inoculations of 2 tryptic soy gar (TSA) slants, 1 nutrient broth (TSB), 1 nutrient gelatin deep, 1 motility
The SMART goal for the patient’s diagnosis of diarrhea is that the patient will defecate formed, soft stool every 1 to 3 days and will express relief of cramping with little or no diarrhea. The intervention to meet this smart goal is the administration of fidaxomicin, a narrow spectrum antibiotic, to treat the infection of Clostridium difficile (Sears, 2013). Another nursing intervention for the treatment of diarrhea is assessing the patient for sodium and potassium loss, as well as explaining the prevention methods to avoid the spread of excessive diarrhea (Mitchell, 2014). The nurse must also provide proper skin integrity care to the peritoneal are and make the environment safe and easy for access to the bathroom. The SMART goal for the patient’s diagnosis of acute pain is that the patient will state relief of pain in abdominal area after treatment with opioids in a 24hr period. The nursing intervention for acute pain is the administration of opioids as well as positioning to keep patient in as much comfort as possible and take pressure off of the abdominal area. The nurse must also assess the patient’s vital signs and pain level
The first step of a comprehensive incendiary investigation is fire scene investigation. In the Tight Shoe Inc. report this is shown in the background information, property description, type of incident, fire cause, incendiary device description, evidence, photographs, property, and documentary evidence. This step reflects the work done and collected at the fire scene. The next step is assessment of investigative needs which is shown in the Tight Shoe Inc. report under motive and interviewing firefighters and other first responders. This step is usually done on the scene of the fire or right after. The following step is formulation and evaluation of a strategy which is shown in the Tight Shoe Inc. report under prosecution reports, obtaining search warrants and arson laboratory report. The next step of implementation of strategic plan is shown under insurance and potential criminal violations. The final step of the process is presentation of formal investigation is shown under summation of the investigation.
Treponema pallidum 2 Introduction Treponema pallidum is a Gram-negative bacterium that has a spiral shape (1). They are about 6 to 20um in length and 18-20um in diameter (1). Treponema pallidum can only survive within a host which makes them obligate internal parasites, meaning that outside a host this organism will die due to the absence of nutrients, exposure to oxygen and heat. Also, since this organism can’t be grown on a culture medium, animal models are used to study T. pallidum (1). Treponema pallidum bacteria consist of an inner and outer membrane with a thin peptidoglycan cell wall lacking liposaccharides (1).
The purpose of the study is to identify an unknown microorganism using multiple microbiology lab techniques. Through this process I will gain knowledge on how to perform these techniques as well as the importance of these tests on identifying unknown microorganisms. This is significant as the goal of this course is to familiarize ourselves with the common microbiology tests as well as the microorganisms we encounter in our daily activities.
JIU-CONG, Z., LI, S.,& QING-HE, N. (2010). Botulism, where are we now?. Clinical Toxicology (15563650), 48(9), 867-879. doi: 103109/15563650.2010.535003
Among hospitalized patients around the world, Clostridium difficile is the primary source of infectious diarrhea. Previously, continuously unbalanced intestinal microbiota, usually due to antimicrobials, was deemed a precondition of developing the infection. However, recently, there have been alterations in the biology from virtually infecting the elderly population exclusively, wherein the microbiota in their guts have been interrupted by antimicrobials, to currently infecting individuals within of all age groups displaying no recent antimicrobial use. Furthermore, recent reports have confirmed critical occurrences among groups previously assumed to be of minimal risk—pregnant women, children, and individuals with no previous exposure to antimicrobials, for instance. Unfortunately, this Gram-positive, toxin-producing anaerobic bacterium is estimated to cost US critical care facilities $800 million per year at present, suggesting the need for effective measures to eliminate this nosocomial infection (Yakob, Riley, Paterson, & Clements, 2013).
Capriotti & Frizzell (2016) explain that sepsis is often seen in those who have a weak immune system. These individuals are at an increased risk of developing sepsis from microorganisms that a healthy immune system would normally fight off (Capriotti et al. 2016). The elderly, infants, and immunosuppressed patients are the most at risk for developing the condition (Capriotti et al. 2016). Sepsis can be caused by any microbe, but is most often caused by bacteria (Capriotti et al. 2016). Since sepsis has such a broad reach and can develop as a secondary infection after an initial injury or illness, Capriotti & Frizzell (2016) further explain the di...
Clostridium perfringens is a gram-positive spore-forming bacillus involved in foodborne illness and wound infection. It is an obligate anaerobe and the only member of the genus Clostridium that is non-motile. This microorganism is normally present in soil and decaying vegetation and is an inhabitant of animal and human intestines. According to the Centers for Disease Control and Prevention, C. perfringens is one of the most common sources of foodborne illness in the United States, being the cause of an estimated 1 million cases each year. However, it is also prevalent worldwide. This bacterium has the shortest reported generation time of any organism at 6.3 minutes in thioglycollate medium, making it particularly virulent after initial inoculation.
According to the Spanish Newspaper “El Mundo”, the sequence of events are as follows: at Atocha station one explosion occurred at 07:37 and two more at 07:38; at El Pozo del Tío Station two explosions occurred at 07:38; at Santa Eugenia St...
Bacterial cells, like plant cells, are surrounded by a cell wall. However, bacterial cell walls are made up of polysaccharide chains linked to amino acids, while plant cell walls are made up of cellulose, which contains no amino acids. Many bacteria secrete a slimy capsule around the outside of the cell wall. The capsule provides additional protection for the cell. Many of the bacteria that cause diseases in animals are surrounded by a capsule. The capsule prevents the white blood cells and antibodies from destroying the invading bacterium. Inside the capsule and the cell wall is the cell membrane. In aerobic bacteria, the reactions of cellular respiration take place on fingerlike infoldings of the cell membrane. Ribosomes are scattered throughout the cytoplasm, and the DNA is generally found in the center of the cell. Many bacilli and spirilla have flagella, which are used for locomotion in water. A few types of bacteria that lack flagella move by gliding on a surface. However, the mechanism of this gliding motion is unknown. Most bacteria are aerobic, they require free oxygen to carry on cellular respiration. Some bacteria, called facultatibe anaerobes can live in either the presence or absence of free oxygen. They obtain energy either by aerobic respiration when oxygen is present or by fermentation when oxygen is absent. Still other bacteria cannot live in the presence of oxygen. These are called obligate anaerobes. Such bacteria obtain energy only fermentation. Through fermentation, different groups of bacteria produce a wide variety of organic compounds. Besides ethyl alcohol and lactic acid, bacterial fermentation can produce acetic acid, acetone, butyl alcohol, glycol, butyric acid, propionic acid, and methane, the main component of natural gas. Most bacteria are heterotrophic bacteria are either saprophytes or parasites. Saprophytes feed on the remains of dead plants and animals, and ordinarily do not cause disease. They release digestive enzymes onto the organic matter. The enzymes breakdown the large food molecules into smaller molecules, which are absorbed by the bacterial cells. Parasites live on or in living organisms, and may cause disease. A few types of bacteria are Autotrophic, they can synthesize the organic nutrients they require from inorganic substances. Autotrophic bacteria are either photosynthetic or Chemosynthetic. The photosynthetic bacteria contain chlorophyll that are different from the plant chlorophyll. In bacterial photosynthesis, hydrogen is obtained by the splitting of compounds other than water.
T. pallidum is highly sensitive to oxygen and has a decreased ability to survive when not in human body temperature environments 1. The mode of transmission is through sexual contact or vertical transmission from the mother to the fetus. T. pallidum lacks the lipopolysaccharide which is the endotoxin normally present in gram negative bacteria1. The bacterium does produce many lipoproteins which are thought to prompt the inflammatory mediators through the recognition of toll-like receptors1. T. pallidum has a virulence factor of being highly motile due to its ability to propel itself forward by rotating on a longitudinal axis1. The spirochetes easily penetrate the skin or mucosal membranes and spread throughout the lymph nodes and then the blood circulation, affecting many parts in the body1.