EXAM1 Flashcards
i. Athlete’s foot
ii. Disad: bad internally
Narrow fungus
cell membrane
Amphotericin B
i. Dutch linen merchant
ii. First to observe living microbes
iii. Single=lens magnified up to 300X
iv. Very protective of his work
v. father of microscopes
vi. saw animalcules (algae and protozoa)
Anton van Leeuwenhoek 1632-1723
flagella on outside
spirillum
i. Pioneer of Antiseptic Surgery
ii. washed hands and heated equipment with phenol and found that it greatly reduced infection
l. Jospeph Lister
- has outer membrane of lipopolysaccharide/phospholipid bilayer found outside peptidoglycan portion
- Two periplasmic spaces
- thin peptidoglycan layer
G- cell wall
- Small intracellular parasites
- G- cell wall
- Nonmotile rods or coccobacilli
- Ticks, fleas, lice involved in life cycle
- Bacteria enter endothelial cells –>necrosis of vascular lining - vasculitis, vascular leakage, and thrombosis
ii. The Rickettsia Genus
- composed of protein and RNA
- have large and small subunit scattered throughout the cell when non engaged in protein synthesis
a. small unit
i. translates mRNA
ii. contains the RNA that Carol Woese used to distinguish the domains
b. Large unit
i. highly conserved ribozyme (RNA enzyme) used to generate peptibe bonds)
ii. peptidyl transferase
Ribosomes
Sedimentation Rate
70s
80s
Prokaryotic ribosome
Eukaryotic
i. The Spirochetes
ii. The Rickettsia Genus
iii. Chlamydiaceae Family
Gracillicutes
G-
spheres in pairs
diplococci
- Slime Layer
a. loosely organized and attached, thinner - Capsule
a. highly organized matrix of proteins and sugars,
b. tightly attached
c. harder to stain
d. makes bacteria appear shiny
Glycocalyx Layer Types
- weak sexually transmitted pathogens
ii. mycoplasma genitalium/ureplasma urealyticum
curved rod
vibrio
All cells have cell membrane with sterols
E
rods laying side by side
palisade
more than one dye used
differential
Augmentin=amoxicillin+beta-lactamase inactivator
Broad
cell wall
yeah
i. optional coating of molecules external to the cell wall, made of sugars and/or proteins
ii. two types of layers
Glycocalyx
Undulipodia are similar to cilia and flagella
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Eukarya
i. Target cell components common to most pathogens (ribosomes)
d. Broad spectrum - greatest range of activity
i. beta lactam ring (pretty much for all the cilins)
ii. disadvantage - allergies
iii. Narrow - G+ and syphilis
Narrow G+
Cell wall
Penicillin
provides the surface where your smear will be located.
Glass Slide
which domains includes organisms with prokaryotic cell type?
A and B
which domain was first to appear?
A
Which cell wall type porins?
G-
i. colony appearance,
ii. color,
iii. texture
Macoscopic morphology
tube where liquid agar was cooled while tube was lying down on angle tocreate a sloped agar surface, so there’s more surface area where bacteria can grow.
Nutrient Agar Slant
i. The capacity to distinguish or separate two adjacent objects
ii. Depends on the wavelength of light that forms image
1. shorter wavelength, or use of electrons, increases the resolution
iii. Also improved with oil immersion (immersion has the same refractive index as glass)
Resolution
a. No cell walls
b. only cell membranes
c. Sterols in cell membrane (flexibility)
i. HUGE MINORITY HERE IN TERMS OF BACTERIA
d. Surface adhesins allow them to bind strongly to receptors on cells
e. Non-motile
f. Facultative Anaerobes
g. Gram Stain (-) although no peptidoglycan
h. highly pleomorphic
i. Include Mycoplasmas genus
Tenericutes
i. discovered first antibiotic, penicillin
ii. isolated in 1939 by Ernest Chain and Howard Florey
iii. Extracted from Penicillum mold
Alexander Fleming 1929
The smear with nigrosine air dried is it
Negative stain
Bacteria spread out in ink
Negative and Capsule
characterized by cell wall includes S layer
A
kills the bacteria; makes the bacteria adhere; helps the bacteria absorb stain
Heat Fix
Think Firm Peptidoglycan
Firmicutes
i. Broad to G+/G-
ii. Downside allergies; resistance; harder to absorb
Broad
cell wall
Ampicillin
- No peptidoglycan in cell wall
- Have S layer
- Histone-like molecules
- unique DNA polymerase
- Ribosomes similar to eukarya
- Unique membrane lipids
Archaea
i. metabolism
ii. temperature
iii. nutrient requirements
Bacterial physiology
What makes an endospore resistant to chemicals and radiation?
Spore coat
Which domain includes cells that can produce endospores
B
a. Vectors - something living that can transmit the microbe
i. tick
b. Reservoirs - source of microbe in nature
i. mouse, deer
c. Transmission
i. Inoculation - not communicable unless preggers
d. Symptoms
i. Primary
1. Bull’s eye
2. rash + flu
ii. Systemic
1. circulation
iii. Secondary
1. all tissues
2. CNS
3. Heart
iv. Tertiary
1. Arthritis
Grancilicutes
Spirochete
Barrelia Burgdorferi
Lyme Disease
- Place heat fixed smear on staining rack over your sink.
- Flood with methylene blue for 1 minute
- Rinse slide with distilled water
- Blot with bibulous paper
- View with oil immersion.
Simple stain
- Add mycobacterium mix it with water. Also add staphylococcus
- Air dry and heat fix smears.
- Place heat fixed smear on screen over steaming water.
- Apply carbolfuchin to cover smear; steam for 5 minutes.
a. primary stain - used to color acid-fast cells; when absorbed, will give pink/red color to acid fast cell wall. - Remove slide from screen and let it cool; rinse with water for about 30 seconds.
- Rinse drop by drop with acid alcohol until run off clear
- Briefly rinse with water
- Place slide on staining rack and counterstain with methylene blue for 30 seconds.
a. counterstains colors any non acid fast cells - Dry with bibulous paper.
Acid Fast Stain
GI upset
Narrow G+
Aminoglycosides
Erythromycin
Reduces the refractive loss of light
Oil Immersion
only one dye used
simple stain
i. deafness; kidney damage
Broad
Aminoglycoside
70s ribosome
Streptomycin
(Max dose tolerated by host)/(Dose needed to kill the microbe)
= Therapeutic Index (want high)
uses a primary stain and a counterstain to distinguish cell types or parts
Differential Stain
i. Vegetative cell: metabolically active and growing
ii. Endospore - When exposed to adverse environmental conditions
iii. Capable of high resistance and very long term survival
iv. Hardiest of all life forms
Endospores
- G-
- Intracellular parsites
- Polymorphic - its life cycle includes two different forms
a. elementary bodies
i. time infectious agent that’s taken into cell where it grows inside vacuole into reticulate body
ii. infectious form
b. reticulate bodies
i. the form that multiplies inside cell; turning back into elementary bodies before escaping from the hos cell via lysis.
Chlamydiaceae Family
- makes bacteria stick to slide, kills bacteria, allows bacteria to absorb stain more easily.
Pros for heat smear
Cells have nucleoid that consists of single chromosome
A & B
A smear is ready to be heat fixed if
has been air dried
- THe microrganism or other pathogen must be present in ALL cases of the disease
- Thep athogen can be isolated from the diseased host and grown in pure culture.
- The pathogen from the pure culture must cause the disease when inovulcated into a healthy, susceptible lab animal.
- The pathogen must be reisolated from the new host and shown to be the same as the originally inoculated pathogen.
Koch’s Postulates
The four criteria established by Koch to identify the causative agent of a particular disease
Flagella powered by ion channels
Bacteria
i. FIne, hairlike bristles emerging from cell surface of _ domain
ii. Function in adhesion to other cells/surfaces
iii. contribute to virulence
Bacteria G+ G-
stains improve
definition
- Talk about why microbes are essential
They're everywher producers decomposers drugs/chemicals recyclers damage understand higher forms of life
Which scientists contributed the most to the development of the growth media and pure culture techniques we used in class?
Koch
i. demonstrated thatif dust removed from the air, bacteria don’t grow
ii. demonstrated the presence of heat resistant forms of some microbes
iii. Developed Tyndallization, intermitten boiling that eliminates what we now know to be the endospores that caused Pasteur to have inconsistent results
iv. Explaiining Pasteur’s results (which were sprouting endospores) end belief in spontaneous generation.
i. John Tyndall England 1859
i. No sterols in membrane
ii. Phospholipid bilayer with embedded proteins
1. phospholipids contain unbranched lipids/fatty acids.
iii. Functions
1. Providing site for energy reactions
2. Nutrient processing
3. syntehsis
4. Passage of nutrients into cell, discharge of wasts
5. Selectively permeable
Bacteria Cell Membrane
When you’ve finished applying stain, what colorshould the endospore be?
Green
vegetative will be pink.
- no infectious
2. but responsible for the O2 explosion. booyah.
Cyanobacteria
i. Genome Analysis
ii. Serology
iii. Phage Typing (virus)
Molecular techniques to classify bacteria
Why do you steam your slide while applying the stain?
To make the stain penetrate the spore coat
these dyes are cationic, with positively charged chromophores
Basic dyes
i. are extra-chromosomal DNA; 1-20 exist per cell
ii. They are transferrable
iii. only in Bacteria and Archaea
iv. None of the genes are required are essential to survival; but are bonuses.
`Plasmid
Coat is made of keratin and spore specific proteins makes acid/radiation/chemical/disinfectants/dyes/antibiotics difficult to penetrate
Endospores
- nucleoid
- ~4k genes
- Bacteria - no histones
- Archaea - histone-like
Prokarya
We make smears to
prepare bacteria for staining and to spread out bacteria
i. high toxicity index
ii. need pick line to adimnistrate
iii. only used topically
narrow G+
cell wall
Vancomycin
rods in pairs
diplobacilli
Heat fixing a smear
helps bacteria absorb the stain
kills the bacteria
helps the bacteria stick to the slide
Who lended support for the connection between microbes and disease by establishing a set of postulates to confirm the development of a specific disease by a specific microbe?
Robert Koch
i. improve definition
ii. negative stains background
iii. positive stains bacteria itself
staining
Heat-dried
Capsule stain
i. Boiled the broth longer, sealed the flask, nobacteria grew.
ii. argued that he destroyed the “vegetative force” of the broth and degraded the small amount of air that was there.
iii. Gravy boiled + lid –> w/o lid? bacteria growth. w/lid? no growth.
g. Lazzaro Spallanzani 1765 Italian
i. narrow for G+
ii. downside: allergies
Cell wall
methicilin
(Toxicity to the host)/(Toxicity to the microbe)
=Toxicity index (want low)
- Take one of heat fixed smears and place it on screen over steaming water
- Put small piece of paper towel on top of the smear and add enough malachite green to saturate the paper.
a. malachite green primary stain - Steam for 5 minutes while keeping the paper moist with additional stain as needed.
a. since spores resistant to staining. - To avoid stain get on bottom of slide, hold slide with clothespin over steam rather than let the slide sit there.
- remove slide from screen and let it cool; rinse with distilled water for 30 seconds.
- Place the slide on staining rack and counterstain with sfranin for 20 seconds
a. This is the counterstain that stains the vegetative cells. - Rinse the slide and blot dry.
a. Endospores should be green; vegetative cells should be red/pink.
Endospore Stain
i. Survive
ii. Withstands extremes in heat, drying, freezing, radiation, chemical
iii. NOT a means of reproduction
Endospores
How many periplasmic spaces?
G+ 1
G- 2
Cells in domain have membrane bound organelles
E
i. Bacteria - Streptomyces and Bacillus
ii. Molds - Penicillium and Cephalosporium
Source of Antibiotics
The advantage of a negative stain is
There is very little cell shrinkage
chains
strpt
single flagellum at one end
small bunches emerging from the same site
flagella at both ends of the cell
flagella dispersed all over the cell
monotrichous lophotrichous amphitrichous peritrichous Flagellar Arrangements
Aplastic anemia - loss of red bonoe marrow w/LT use
Broad
Aminoglycosides
70s riboosomes
Chloramphenicol
packets
cubical packets
Discovery of endospores
Cohn
capsule stain is
combination of negative and simple stain
differential stain
Proponent for and lended support for Spontaneous Generation
John Needham
Branched apart ~1.5 bya
eukarya from archaea
one
singular
Which demonstrated that maggots did not spontaneously generate from something non-living (meat in the case)?
Francesco Redi
d. Germination - return to vegetative growth
Endospores
v. dipicolinic acid and calcium ions displace water; make spore extremely heat resistant
Endospores
i. Refuted spontaneous generation of macroscopic organisms
ii. demonstrated maggots don’t generate from meat.
iii. Meat with gauze had no maggots; meat open had maggots hatching into flies.
Francesco Redi Italian mid 1600’s
Think Graceful Peptidoglycan layer
Gracillicutes
- Schwann: all animal tissues composed of cells
- Schleiden: All plant tissues composed of cells
- Virchow: All cells only arise from pre-existing cells
Cell theory
cells can have glycocalyx
A B E
Which cell wall has outer membrane?
G-
which bacteria shapes are always solitary
vibrio, spirillum, spirochete
i. Poor absorption in GI
1. Needs to be injected
Broad
cell wall
Cephalosporins
i. Phospholipids contain backwards glycerol, and no fatty acids - isoprene chain - helps them to resist heat.
Archaea Cell Membrane
i. Connected infection with microbes - Savior of the Mothers
ii. Failed to convince doctors to wash their hands.
iii. Pioneer of Antiseptic procedures
k. Philipp Semmelweis (1840’s)
i. Disadvantages: not selective
ii. only used topically
iii. neosporin
Narrow G-
cell membrane
Polymyxin
attacks both microbe and host
Non-Selective
Looks for glycocalyx in forms of capsule - a protective covering sometimes used for attachment and nutrient reserve
Capsule Stain
Which first showed that fermentation by microbes could result in food spoilage, while also proposing and lending much support to the Germ Theory of Disease?
Pasteur and Koch
what is being “stained” with negative stain
background
a. Vectors
i. dog ticks
b. Reservoirs
i. dog ticks
ii. rodents normal; humans accidental
c. Transmissions
i. inoculation on accident (rats normal; humans accident)
d. Symptoms
i. Bites have 3-12 day incubation period; Sx flu-like rash; shock
ii. Mortality ~20% in untreated
- Rocky Mountain Spotted Fever (Rickettsia rickettsii) - 1/2 in southeast U.S.
i. Nutrition and physical environment
1. body temperature?
ii. Growth Characteristics
1. Color, Texture
iii. Metabolism
1. H2S - anaerobe
2. aerobic?
iv. Staining
1. G staining
2. capsule
3. endospore
v. Cell Morphology
1. Cell shape
2. arrangement
3. flagella?
Diagnostic techniques to classify bacteria
- have protein, glycoprotein, and polysaccharide
- NO peptidoglycan
- S layer - outer protein lattice that gives strength to the cell wall in extreme environments
Archaea