The Discovery Of Giardia Lamblia

For many years the identification of microorganisms has been important in the world of medicine. It is essential or correct disease diagnosis in patients and for proper treatment. Knowing the correct identity and characteristics of microorganism is crucial when disease outbreaks occur in populations, also knowing how humans can benefit from microorganisms is important; many can be used in making certain foods or antibiotics.

Often scientists work with bacteria that do not come in a labeled test tube— for example, bacterial samples taken from infected human tissue or from the soil—and the scientist must then identify the unknown microorganism in order to understand what behavior to expect from the organism, for example, a certain type of infection or antibiotic resistance. However, because of the relatively few forms of bacteria compared to animals and because of the lack of bacterial fossil records due to their asexually reproductive nature, the taxonomy used to classify animals cannot be applied to bacteria (Brown 275). In order to classify unknown bacteria, a variety of physiological and metabolic tests are available to narrow a sample down from the fathomless number of possibilities into a more manageable range. Once these tests have been performed, the researcher can consult Bergey’s Manual of Determinative Bacteriology, a systematically arranged and continually updated collection of all known bacteria based on their structure, metabolism, and other attributes.

The Human Body in Health and Illness, 4th Edition Answer Key - Study Guide Chapter 5: Microbiology Basics Part I: Mastering the Basics Matching—Germs, Worms, and Terms 1. G 2. I 3.

Citrobacter Freundii is a species of bacteria that can be potentially harmful to humans. It is known to cause meningitis by protruding into the brain and replicating itself (1). The Citrobacter species has also been found as a cause of some urinary tract infections, diarrhea, and even gastrointestinal diseases and symptoms (3). C. Freundii can be located in a wide variety of soils and water (3). Lastly, it is also the cause of many nosocomial infections due to its presence in water (1).

faecalis has a low pathogenicity (scilo), it is a virulent, opportunistic pathogen to be reckoned with and is thought of as a super-bug. This is not only due to its ability to resist a variety of antibiotics, but also its ability to travel and employ biofilm formations. It can grow and adapt in many different environments. It can thrive in a wide range of temperatures and has disregard whether salt or oxygen are present, or whether the pH is basic or acidic. Its resilience on inanimate objects makes it a perfect candidate for transmission to occur within the hospital environment from hand to instrument, but it can also be spread via hand-to-hand contact and from food contamination (Public Health Agency of

The purpose of this study was to determine what an unknown bacteria was using several different microbiology lab techniques including an API test, an oxidase test, a gram stain, a hanging drop slide, and morphology identification. The unknown bacterium, which was contaminated with Serratia marcescens, was isolated by streaking the bacteria solution to single colonies. The isolated unknown white bacteria, had the appearance of circular form, convex elevation, entire margin, elongated cocci. The tests than showed that the bacteria was gram-negative, non-motile,

The purpose of this lab was to identify an unknown microorganism using lab techniques. The importance of identifying microorganisms is essential to the survival of humans, expansion of modern day medicine and improvement of quality of life. In 1884, Hans Christian Gram designed a differential staining technique to identify bacteria that would change the future of microbiology. He give rise to a staining process, known as the Gram stain to differentiate microorganisms into two groups between positive and negative gram staining microorganisms. The Gram stain is essential in a lab technique as it distinguishes the cells based on the physical properties of the individual cell walls, and is almost always the first test preformed to differentiate a microorganism. The identification of weather a microorganism is gram positive or negative can revel the bacteria’s virulence, cell wall structure, resistance to antibiotics, resistance to physical disruptions and so much more. In order to identify the unknown provided, unknown #27, the Gram stain was the first test preformed. After discovering that the unknown bacterium was indefinitely a gram positive microorganism, the vast possibilities were narrowed down. However, In order to more definitively identify the unknown, the next step was to preform biochemical tests. A biochemical test identifies metabolic

Gerhart, D. “Ferdinand, Cohn, a Founder of Modern Microbiology”Features. Nov 1999. Retrieved on January 16, 2014 from microbeworld.org: http://www.microbeworld.org/images/stories/history_pdfs/f3.pdf

This experiment can be enhanced in many ways. The amount of alcohol used as treatments could be lessened to measure the viability of A. salina more accurately. The amount of cysts in each Petri dish was not consistent because there

The purpose of this study is to identify four unknown organisms. The unknown organisms have been assigned randomly to six-research groups by Professor Hoffman. Each research group was provided two eukaryotes and two prokaryotes. The unknown organisms will fall into the following classifications: bacteria, algae, fungi, or protozoans. All living organisms are organized into one of three domains of life, Bacteria, Archaea, and Eukarya.

A highly conserved gene will be used to identify a prokaryotic species isolated from the body. Fundamental lab techniques will be also explored and utilized, such as amplifying using PCR, cloning, and transforming the gene into a host cell. DNA electrophoresis and specific substrate plating will serve as analysis check points. The final product will be sequenced and compared to similar species to observe phylogenetic relationships.

Shigella is a genus of Gram-negative, facultative anaerobic, nonspore-forming, nonmotile, rod-shaped bacteria. The genus is named after Kiyoshi Shiga, who first discovered it in 1897. The causative agent of human shigellosis, Shigella causes disease in primates, and is the only naturally found in humans and apes. Shigella is one of the leading bacterial causes of diarrhea worldwide and it is suggested that Shigella causes about 90 million cases of severe dysentery, with at least 100,000 of these resulting in death each year. Shigella originates from a human-adapted E. coli that has

Life on this planet began with microorganisms. Through millions of years microorganisms have found ways to successfully adapt and survive. These adaptations have created a wide biodiversity, allowing them to basically populate in all places. Why are these microbes so important? Because they shape the history of our world. Some microbes can be deathly to humans while some others are favorable, for example, bacteria that lives in the gut of both humans and animals and helps during the process of digestion (Alfred Brown & Heidi Smith, 2006). Understanding these interactions help scientists to find ways to protect humans from potential deathly pathogens. In order to observe microbes, microscope proficiency and microorganisms’ identification are crucial skills in a microbiology lab. During this laboratory session, samples of environmental and human organisms were inoculated into two different rich media and incubated to their according temperature. After this, appropriate use and calibration of the microscope was performed. Lastly, morphology and size of different species of bacteria, algae, fungi and protozoan were recorded.

Toxoplasma gondii is one of the most interesting parasites known to date. It has a facultative heteroxenous life cycle and it can infect all warm-blooded animal including mammals, birds and humans. T. gondii is prevalent in most countries of the world and is of medical importance, because it may cause abortion or congenital disease in its intermediate hosts (Tenter et al. 2000). In its intermediate host, T. gondii undergoes two phases of asexual development. During the first phase tachyzoites multiply in different types of host cells. The last generations of tachyzoites initiate the second phase of development, which results in the formation of cysts in the intermediate host. Within the cyst, bradyzoites multiply rapidly and these cysts readily form in the neural and muscular tissues of the host. However, they may also be found in visceral organs such as the lungs and liver( Tenter et al. 2000). These cysts are immediately infectious to the intermediate host. In many intermediate hosts the cysts may persist for the life of the host giving rise to a latent infection. If the cysts are ingested by a definitive host, the bradyzoites initiate another asexual phase, which consists of repeated endopolygeny in epithelial cells of the small intestine (Tenter et al. 2000). Then comes the sexual phase of the lifecycle. Oocyst formation takes place in the epithelium of the small intestine and unsporulated oocysts are released into the intestine and passed out with defecation. Sporogony

Cryptosporidium parvum is a protozoan intestinal parasite causing a short-term enteric illness in individuals with functioning immune systems, and can cause a potentially fatal infection in immunosuppressed individuals. Because of C. parvum’s resistance to many of the procedures used to process drinking water and food, and the parasite’s extremely high fecundity, the potential for a large scale outbreak is very high. In fact, C. parvum was responsible for an outbreak in Milwaukee in 1993 when an estimated 403,000 people became ill. This was the largest waterborne outbreak of disease in United States history. This paper will cover some aspects of C. parvum’s life cycle, human sickness