M10 Gram -Ve Bacteria 1

Question 1

what re the four main gram -ve bac

Answer 1

cocci
curved rods
strict anaerobes
facultative anaerobes

Question 2

what are the two aerobic gram -ve cocci

Answer 2

neisseria

moraxella

Question 3

what is an example of anaerobic gram -ve cocci

Answer 3

veillonella

Question 4

what re some features of neisseira

Answer 4

gram -ve 
facultative aerobe 
non motile
cocci 
pairs, triads, clusters

Question 5

what are the pathogenic neisseria

Answer 5

gonorrhoeae

meningitides

Question 6

what are some oral neisseria

Answer 6

subflava

sicca

Question 7

what is imp about oral neisseria

Answer 7

early tooth colonisers

Question 8

what is n. subflava

Answer 8

most commonly isolated

saccharolytic produces polysac and yellow pigment

Question 9

what is n. sicca

Answer 9

mouth similar to subflava

no pigment prod

Question 10

are n. subflave or n.sicca pathogenic

Answer 10

no

Question 11

what is moraxella

Answer 11

gram -ve bac 
neiseira like
asaccharyltic 
polysaccharide -ve 
Dnase +ve

Question 12

what is the most imp sp of moraxlla

Answer 12

catarrhalis

Question 13

what is moraxella catarrhalis

Answer 13

commensal

pathogen - tonislar b cells causing endocarditis, meningitis

Question 14

what does catarrhalis prod

Answer 14

beta lactamase

complicates Ab therapy

Question 15

what is veillonellla

Answer 15

small gram -ve anaerobic cocci

Question 16

what does veillonella not do

Answer 16

ferment carbs

Question 17

what des veillonella use as energy source

Answer 17

lactic acid –> acetate + 2 propionic acid + CO2 + H20

Question 18

what is the most common strain of veillonell

Answer 18

parvula

Question 19

what kind of bac is parvula

Answer 19

strict anaerobe

Question 20

what does veillonella parvula do

Answer 20

catabolises lactic acid to weaker organic acids - inc pH

Question 21

what bac are present in community acquired pneumonia

Answer 21

moxarella 9.4%
veillionela 1.6%
oral streps 9.4%

Question 22

what are GNABs

Answer 22

gram negative anaerobic Bacilli

Question 23

what re some motile GNABs

Answer 23

selenomas
centipeda
helicobacter

Question 24

what are some non motile GNABs

Answer 24

bacteriodes
porphyromonas 
prevotella 
(tannerella
fusobac)

Question 25

what is usually prescribed for anaerobic microbes

Answer 25

metronidazole

Question 26

what are selenomonas

Answer 26

-crescent + flagellae - gram -ve assc with aggressive periodontitis

Question 27

what are some imp sp of selnomonas

Answer 27

sputigena | noxia

Question 28

what are centipeda

Answer 28

one sp - periodontii | - flagella all round

Question 29

what are helicobacter

Answer 29

H.pylori assc w/gastritis, peptic ulcers in dental plaque

Question 30

what kind of bac are bacteriodes

Answer 30

strictly anaerobic gram -v bacilli

Question 31

what is a main sp of bacteriode

Answer 31

fragilis in mouth main pathogen

Question 32

what does a healthy gingival crevice contain

Answer 32

Gm +ve cocci

Question 33

below gingival crevice what happens

Answer 33

anaerobic conditions | nutrient from gingival tissues rather than food or saliva

Question 34

what happens in periodontitis

Answer 34

plaque inc = gingivitis (streptococcus) plaque between tooth and gum = pocket (actinomyces ) pocket deep, gingiva recede and bone lost (porphyromomas gingivalis and prevotella intermedia)

Question 35

what are some other sp of bactericiodes

Answer 35

prevotella porphyromonas tannerella forsythia

Question 36

whatarethe common themes of the bacteriodes

Answer 36

asaccharolytic | dark pigment

Question 37

what are some imp features of porphyromonas

Answer 37

dark pigment GNAB assacharolytic - prod proteases per pocket p.gingivalis periodontopathogen

Question 38

what are some imp features of prevotella

Answer 38

dark pigment saccharolytic (sucrose --> acetic acid and succinic acid)

Question 39

what doe num of prevotella intermedia correlate with

Answer 39

periodontitis sererity

Question 40

what is prevotella dentalis

Answer 40

non pigmented | from root canals and perio pocket

Question 41

what does black pigmented bac require

Answer 41

iron

Question 42

what is o surface of BPB

Answer 42

porphyrins | with iron but without = photosensitive

Question 43

what is treat BPB with blue light

Answer 43

excitation prod reactive oxygen species destroy lipids,protein etc