Introduction to Microbiology Flashcards
Study of organisms and agents too small to be seen by the naked eye
Microbiology
Which is smaller, bacteria or viruses?
Virus
What is the size of a typical bacterium?
2 microns
What is the typical size of virus? 
0.02-0.4 microns
Suggested that diseases were caused by “invisible living creatures”
Lucretius and Girolamo Fracastoro
Made the earliest observations on bees and weevils using a microscope supplied by Galileo
Francesco Stelluti
The first book devoted to microscopic observations
Micrographia (1665)
Reported to the world that life’s smallest structural units were “little boxes” or “cells”
Robert Hooke
Theory that states that all living things are composed of cells
Cell Theory
Considered as the “first true microbiologist”
Anton van Leeuwenhoek
Father of Bacteriology, Microbiology, and Protozoology
Anton van Leeuwenhoek
Tiny living and moving cells that Leeuwenhoek saw through his simple, single-lens microscope
Animalcules
Thought that organic matter contained a vital force that could confer life on non-living matter
Spontaneous generation (Abiogenesis)
Living cells can rise ONLY from pre-existing living cells
Biogenesis Theory
Mentioned that simple invertebrates could arise from Spontaneous Generation
Aristotle
Demonstrate that maggots did not arise spontaneously from decaying meat
Francesco Redi
The proponent of spontaneous generation
John Needham
Improved Needham’s experiment
Lazzaro Spallanzani
Showed the importance of oxygen to life
Anton Laurent Lavoisier
Challenged the case of spontaneous generation with the concept of Biogenesis: living cells can arise only from pre-existing living cells
Rudolf Virchow
Observed that no growth occurred in a flask that contained a nutrient solution after allowing the air to pass through a heated tube
Theodor Schwann
Notice that no growth occurred after allowing the air to pass through sterile cotton wool placed on a heat-sterilized medium flask.
Heinrich Schroder and Theodore von Dusch
Father of modern microbiology
Louis Pasteur
Techniques that prevent contamination by unwanted microorganisms, which are now the standard practice in laboratory and many medical procedures
Aseptic Techniques
Showed that dust carry germs that could contaminate a sterile broth
John Tyndall
Form of sterilization that uses moist heat for three consecutive days
Tyndallization
What is the use of Tyndallization?
To eradicate vegetative cells and endospores
Discovered that there are bacteria that could withstand a series of heating and boiling
Ferdinand Cohn
Heat resistant structure of bacteria
Endospores
Aerobic heat resistant bacteria
Bacillus
Anaerobic heat resistant bacteria
Clostridium
Who disproved the theory of spontaneous generation?
Pasteur
When was the rabies vaccine developed?
1885
When was the anthrax vaccine developed?
1881
Causative agent of rabies
Rhabdovirus
Causative agent of anthrax
Bacillus anthracis
Who developed rabies and anthrax vaccine?
Pasteur
What to use when hands are visibly contaminated?
Antibacterial soap and water
What to use when hands are not visibly contaminated?
Alcohol
Culture of avirulent microorganism for preventive inoculation
Vaccine
Components of anti-toxin
Antibodies
Components of vaccine
Antigen / weakened, attenuated, and dead microorganisms
Enrichment media for N. gonorrhea
Thayer Martin Agar
Enrichment media for gram + bacteria
Phenyl Ethyl Alcohol Agar
Causative agent of Syphilis
Treponema pallidum
What are the spirochetes
Borrelia, Leptospira, Treponema (BLT)
Acellular microorganism with nucleic acid but no protein coat
Viroids
Acellular microorganism with protein coat but no nucleic acid
Prions
Acellular microorganisms with nucleic acid (DNA/RNA) and protein coat
Virus
Prokaryotic microorganisms
Archaea, Bacteria, and Cyanobacteria
Eukaryotic microorganisms
Fungi, Algae, and Protozoa
Largest bacteria
Bacillus anthracis
Smallest bacteria
Mycoplasma pneumoniae
Only bacteria without cell wall
Mycoplasma pneumoniae
Shape of Mycoplasma pneumoniae
Pleiomorphic (vary in shape)
Smallest pathogenic bacilli
Haemophilus ducreyi
Disease caused by Haemophilus ducreyi
Chancroid
Manifestation of syphilis
Chancre
Rod shaped organisms
Bacilli
Spherical / round organisms
Cocci
Bacilli with tapered pointed ends
Fusiform
Vary in shape
Pleiomorphic
Spiral shaped organisms
Spirochetes
Unique appearance of N. gonorrheae
Pairs / diplococci
Shape of Streptococcus pneumoniae
Oral, bullet, lancet shaped
Bacteria in chain like arrangement
Streptococcus
Bacteria in grape-like clusters
Staphylococcus
Group of four / tetrads
Peptococcus
Packets of eight / cuboidal
Sarcinae
Palisades / Chinese character appearance
Corynebacterium diphtheriae
Stated that yeast cells are responsible for the conversion of sugars to alcohol
Theodor Schwann
Found that microorganisms called yeasts convert the sugars to alcohol in the absence of air: FERMENTATION
Louis Pasteur
Process of heating the beer and wine just enough to kill most of the bacteria that caused the spoilage
PASTEURIZATION
He stated that souring and spoilage are caused by different microorganisms called bacteria
Louis Pasteur
He proved that a fungus caused another silkworm disease
Agostino Bassi
He demonstrated that routine handwashing could prevent the spread of disease
Ignaz Semmelweis
Father of Antiseptic Surgery
Joseph Lister
Solution used by Joseph Lister for treating surgical wounds
Phenol solution
Pioneered in promoting among surgeon’s handwashing before and after an operation, the wearing of gloves, sterilization of surgical instruments
Joseph Lister
First to show irrefutable proof that bacteria indeed cause disease
Robert Koch
Discovered Bacillus anthracis and Mycobacterium tuberculosis
Robert Koch
First to cultivate bacteria on boiled potatoes, gelatin, meat extracts, and protein
Robert Koch
Suggested the use of agar, a solidifying agent, in the preparation of the culture media
Fanny Hesse
Developed petri dish
Julius Richard Petri
Developed the enrichment-culture technique and the use of selective media
Martins Beijerink and Sergei Winogradsky
Introduced the concept of vaccination
Edward Jenner
WHO declared smallpox as officially eradicated in:
1979
He developed the vaccine for smallpox
Edward Jenner
Prove that when attenuated strains are introduced into a healthy host, the latter remains protected and healthy against the virulent agent
Louis Pasteur and Pierre Paul Emile Roux
Created a porcelain bacterial filter and developed the anthrax vaccine together with Pasteur
Charles Chamberland
He prepared antitoxins for diphtheria and tetanus
Emil von Behring
Emil von Behring
Antitoxins for diphtheria
First to describe the immune system cells and the process of phagocytosis
Elie Metchnikoff
Treatment of disease by using chemical substances
Chemotherapy
Chemicals produced naturally by bacteria and fungi to act against other microorganisms
Antibiotics
Chemotherapeutic agents prepared from chemicals in the laboratory
Synthetic drugs
Chemotherapeutic agent developed by Paul Ehrlich
Salvarsan (Arsphenamine)
Discovered streptomycin and neomycin antibiotics
Selman Waksman
Father of Antibiotics
Selman Waksman
Alexander Fleming accidentally discovered:
Penicillin
Made the purification process for Penicillin and clinical trials to humans
Howard Florey and Ernst Chain
First to propose the correct biochemical structure of Penicillin
Edward Abraham
Magnification of Leeuwenhoek’s simple, single-lens microscope
50x to 300x
The most common method used both for the detection of microorganisms directly in clinical specimens and for the characterization of organisms grown in culture.
Microscopy
Microscope used for observing non viable, stained preparations
Brightfield Microscope
Microscope used to readily observe living specimens
Darkfield Microscope
Microscope that allows us to observe microorganisms in an unstained state
Phase Contrast Microscope
Microscope used to visualize specimens that are chemically tagged with a fluorescent dye
Fluorescent Microscope
This microscope is used primarily to detect antigen–antibody reactions
Fluorescent Microscope
Microscope that makes internal cellular structure visible
Transmission Electron Microscope
Microscope used for visualizing surface characteristics rather than intracellular structures
Scanning Electron Microscope
Enlargement of the specimen
Magnification
Magnification of scanner objective lens
4x
Magnification of low power objective lens
10x
Magnification of high power objective lens
40x
Magnification of oil immersion objective lens
100x
It is how far apart two adjacent objects must be before a given lens shows them as discrete entities
Resolving power or resolution