Term
Ribosomes
Prokariote
Eukariote |
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Definition
Prokariote: 70S (50S & 30S)
Eukariote: 80S (40S & 60S) |
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Term
Positive Stain
Negative stain |
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Definition
Posative stain: Stain the cell
Negative stain: Stain the background |
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Term
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Definition
- crystal violet positive stain
- Iodine forms a complex with violet
- Alcohol used to wash away
- safranin used to counter stain (positive)
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Term
Acid fast staining process |
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Definition
- Detect cells belonging to the genera mycobacteria or Nocardia
- Gram stains don't work on these genera
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Term
Gram + bacteria
A -> G
(1A, 2B, 2C, 1E, 1G) |
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Definition
- Actinomyces
- Bacillus
- Bifiidobacterium
- Clostridium
- Corynebacterium (& other diphtheroids)
- Enterococcus
- Gardnerella vaginalis
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Term
Gram + bacteria
L -> S
(2L, 1M, 2P, 2S) |
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Definition
- Lactobacillus
- Listeria
- Mobiluncus
- Peptostreptococcus
- Propionibacterium
- Staphylococcus
- Streptococcus
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Term
What determins cell shape? |
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Definition
- Murein Sacculus
- Cytoskeleton
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Term
Bacterial Parts
(all bacteria have) |
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Definition
- Cell Membrane
- Genome
- Ribosomes
- Intracellular macromolecules
- Almost always a cell wall
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Term
Bacterial cell parts
(varies between genus & species) |
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Definition
- Plasmids
- Pili
- Capsules
- Flagella
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Term
Bacterial chromosomal storage |
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Definition
- Single circular chromosome of DSDNA
- Extra info may be stored in plasmids or prophages.
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Term
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Definition
- Made of monomeric unit repeated N number of times
- Type II T independent antigen (High variability, low cross reactivity) IGM, can't immunize
- Flagella, Pilli, or capsules
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Term
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Definition
- Protein
- H antigen
- Chemotaxis
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Term
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Definition
- Protein
- Adherence to host cell
- Antiphagocytic
- Motility
- Sex pili for conjugation
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Term
Capsules/ Slime layers/ Glycocalyx, Exopolysachuride |
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Definition
- K antigen
- Polysachurides. Sugar + Alcohol + D AA
- Cell Surface associated
- Water soluble slime layer
- Or both
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Term
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Definition
- Glob of bacteria/yeast in mucoid exopolysachuride adhering to a wet surface
- Present in > 1/2 all Bacterial infections
- Bacteria phenotypically change when in biofilm.
- MDR
- Constant release of bacteria into blood
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Term
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Definition
- No sterols
- site of respiration/make ATP
- Site of septum formation for cell replication
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Term
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Definition
(peptidoglycan)
- polymer, NAM + NAG
- NAM forms shoots & ladders connection
- Human lysozimes break aminosugar threads connecting NAM to NAG
- Role in nutrient uptake, structure, chemotaxis, osmoreceptors, degradative enzymes,
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Term
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Definition
- Lipid A: Disachurides, Toxic
- Core: sugars
- O AG chain: Sugars, highly interspecies specific, highly intraspecies variable.
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Term
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Definition
- Broad specificity (effect many organs)
- Endogenous & Exogenous Pyrogenic
- Activates alternative & classical compliment
- Activate hageman factor XIII
- Heat stable
- Doesn't form toxoids
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Term
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Definition
- LPS binds to human LBP in serum
- LPS-LBP interacts with CD14 receptors on membrane
- signal transduction causes cell to release mediators
Soluble CD14 binds to endothelial cells, causes leakiness (hypotension) ARDS |
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Term
Sepsis, Severe sepsis, septic shock |
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Definition
- systemic inflammation
- activation of coagulation
- inhibition of fibrinolysis
- 1 and 2 results from LPS activating factor 13.
- Fibrinolysis is inhibited by plasminogen activator inhibitor
- Sepsis survivors have immunosuppresion
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Term
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Definition
- Attachment
- Penetration
- Uncoating
- Macromolecular synthesis
- Assembly
- Release
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Term
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Definition
Latent: Intermittent acute episodes, between episodes, no viral particles present
Chronic: Virus present, disease absent
Slow: Long incubation time
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Term
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Definition
Rhizopod: amoeba move with pseudopoda
Flagellates: Flagella
Ciliates: Cilia
Sporozoans: complex life cycle with sexual and asexual stages |
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Term
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Definition
Mesophile: growth 20-55 C
Thermophiles: growth at > 55 C
Psychrophiles/ Cryophiles: growth <20 C |
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Term
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Definition
- Occurs in cytosol
- 1 2 3 or 4 carbon compounds generated, act as electron and proton acceptor turning NADH2 -> NAD+
- Acidic carbon compound excreted from cell
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Term
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Definition
DNA helicase: separates dsDNA -> ssDNA
Primase: makes short ssRNA primers for DNA synthesis
DNA gyrase: relieves wind tension
Topoisomerase IV: separates chromosomes
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Term
Synthesis of peptidoglycan |
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Definition
- Synthesis of amino sugar in cytoplasm. UDP covalently bound to glucose as tag for converting into NAM/NAG.
- Assemble & move through cell membrane. Performed by bactoprenol.
- Attach new part to growing end of peptidoglycan by transglycolase enzyme
- Final cross linking by transpeptidase
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Term
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Definition
Lag phase: ↑ cell volume & mass, DNA synthesis (no change in cell number)
Exponential phase: Balanced growth in size & number
Stationary phase: No net increase in cell number
Death phase: logarithmic cell death |
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Term
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Definition
- defective phage particles of both lytic and temperate (must be lytic phase)
- Donor genome sheered
- Sheered genome + viral info packaged into virus "pseudovirons/abortive phages"
- Gene transferred
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Term
Transduction
Lysogenic conversion |
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Definition
- Only by temperate bacteriophages
- Lysogenic gives Bacteria new phenotype
- (eg) code for toxin production
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Term
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Definition
- Vary in size between bacteria species
- Encode for extra functions for growth in selective media
- Can horizontally be transfered
- Genomic islands, prophages, plasmids
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Term
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Definition
- Non endemic genes
- can have flanking repeats, fragments of other elements, inserted in vicinity of tRNA sequences, unstable
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Term
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Definition
Kill all
(although bacterial products still present)
- Ethylene oxide
- Aldehydes
- Beta propionate
- Peroxygens
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Term
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Definition
Killing most microorganisms
on inanimate objects
not spores
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Term
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Definition
Clean and no pathogens
Removal of many bacteria |
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Term
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Definition
Using heat to kill bacteria in liquids
below temperature of sterilization |
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Term
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Definition
Chemicals used to kill microorganisms on skin surface or mucous membrane
- Silver nitrate
- Iodine (providone/betadyne)
- Hydrogen peroxide
- Anionic detergents SLS
- alcohol
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Term
Kirby-Bauer disk diffusion assay |
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Definition
- Qualitative
- agar test for antibiotic susceptibility
- test for inhibit growth (static/cidal)
- block of antibiotic, lawn spread, observe growth
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Term
MIC test
"Minimum inhibitory concentration: |
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Definition
- Quantitative
- In vitro test for growth inhibition
- diluted antimicrobial vs patient bacterial isolate, observe turbidity
- Lowest effective concentration
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Term
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Definition
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Term
Inhibition of cell wall synthesis |
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Definition
Penicillins
cephalosporins
Carbapenems
Bacitracin
Vancomycin
Cyclosporine |
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Term
Inhibition of protein synthesis |
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Definition
Chloramphenical
Aminoglycosides
Tetracyclines
oxazolidinones
glycyclines
Macrolides
Mupiricin |
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Term
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Definition
Sulfonamides
trimethoprim
fluoroquinolones/quinolones
rifampin
metronidazole |
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Term
alteration of cell membrane function |
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Definition
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Term
MBC
"Minimum bactericidal concentration" |
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Definition
- Quantitative
- kill 99.9%
- Plate and grow bacteria from MIC to see if inhibited or killed
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Term
Antimicrobial Seruncidal concentration |
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Definition
- Quantitative
- concentration needed to kill bacteria in presence of serum
- Blood test to determine if MBC was accomplished
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