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1
Removal of fixative and intracellular and extracellular water fron the specimen
DEHYDRATION
2
Filling cavities of the tissue with paraffin
INFILTRATION
3
Replacement of fixative and water with dehydrating agent in preparation for
IMPREGNATION
4
The most affected step
IMPREGNATION
5
Dehydrating agent
ALCOHOL IN INCREASING STRENGTH
6
Alcohol prevent
VIOLENT OSMOTIC CHANGE
7
Accelerated increase in alcohol may result the tissue to
HARD, BRITTLE, SHRUNKEN, DIFFICULT TO CUT
8
Dehydration involves slow substitution of the water in the tissue with an
ORGANIC SOLVENT
9
Characteristics of an ideal dehydrating solution
RAPID WITHOUT SHRINKAGE OR DISTORTION, DO NOT EVAPORATE QUICKLY, DEHYDRATE FAT, DOES NOT HARDEN TISSUE, DOES NOT REMOVE STAIN, NON TOXIC, NON FLAMMABLE
10
Minimum fixative volume
20x THE VOLUME OF TISSUE
11
Acetone can be used in long time t/f
F
12
Do not dry out the tissues t/f
T
13
may be used as long as it does not damage the proteins and miscible,to the fluids to be used subsequently
WATER MISCIBLE, ANHYDROUS FLUID
14
Signs of water content
MACERATED TISSUE, MILKY XYLENE, ANHYDROUS COPPER SULFATE TEST
15
+ in anhydrous copper sulfate
BLUE
16
Temperature in dehydration
37
17
More delicate tissue (embryo) begins at__ ethanol
30%
18
Typical dehydration sequence (4mm) ethanol/min
70%/15, 90%/15, 100%/15, 100%/15, 100%/30, 100%/45
19
Orientation of the tissue must be
OUTSIDE
20
Embryo mold must not be in
SIDEVIEW
21
Best dehydrating agent, Recommended for routine dehydration
ETHANOL
22
Ethanol advs excwpt for routine dehydration
PENETRATES EASILY, USED FOR EYES AND EMBRYO, NON TOXIC
23
Ethanol may react with
UNREDUCED OSMIUM TETROXIDE
24
Long use of ethanol may cause
SHRINKAGE, HARDEN
25
Ethanol extracts more lipids than
ACETONE
26
Ethanol extractss _ and other_from section
METHYLENE BLUE, THIAZINE DYE
27
Ethanol is only slightly miscible to
WAX
28
Can be used in Blood, touch preparations and smear preparation but it is toxic
METHANOL
29
Used in plant and animal micro-techniques, Less shrinkage and distortion than ethanol
BUTANOL
30
Recommended for tissues which do not require rapid processing , Miscible with paraffin
BUTANOL
31
Give 2 butanol cons
ODOROUS, SLOW ACTING
32
Butanol temp
117.7
33
Odorous reag you must use?
FUME HOOD
34
Universal solvent-acts as dehydrating and clearing agent
TERTIARY BUTANOL
35
Tertiary butanol mixes well with
WATER, ETHANOL, XYLENE, PARAFFIN
36
Temp where tertiary butanol solidifys
25
37
Temp of Tertiary butanol
82.8
38
Excellent substitute for ethanol, Less shrinkage and hardening than ethanol. It is also sufficiently water-free to use in place of absolute ethanol and Less expensive. Used in Microwave processing
ISOPROPANOL
39
Isopropanol Cannot be used in the celloidin technic since _ is insoluble in it
NITROCELLULOSE
40
Miscible with 90% alcohol, toluene and xylene Dissolves paraffin wax
PENTANOL, AMYL ALCOHOL
41
Cons of amyl alcohol
TOXIC, CANNOT BE USED IN POORLY VENTILATED ROOM, NOT MISCIBLE WITH WATER
42
Cheap, rapid • Does not extract methylene blue and other dyes from stained sections . May cause less shrinkage of specimen than ethanol
ACETONE
43
Not reactive with Os0, remaining in specimen. • Miscible with most embedding resins.
ACETONE
44
Acetone 2 cons
FLAMMABLE, VOLATILE
45
Acetone may induced_in prolonged immersion
BRITTLENESS
46
Best processing requires a graded series of a mixture of _ and _ before one can go into paraffin
ACETONE, XYLENE
47
Acetone is a
FIXATIVE, DEHYDRATING
48
Universal solvent--it dehydrates and clears. Does not harm tissue over long time periods and Faster dehydrant than ethanol
DIOXANE, DIETHYLENE DIOXIDE
49
2 cons of Dioxane
HIGHLY TOXIC, RIBBONS POORLY
50
Explosive products in dioxane wgen reused
PEROXIDE
51
This where the tisue rriboon palced to fix its fold
FLOATATION BATH
52
2 methods in dioxane
GRAUPNER'S, WEISEBERGER'S
53
tissue is wrapped in a gauze bag and suspended in a bottle containing dioxane and a little anhydrous calcium oxide
WEISEBERGER'S
54
Rapid dehydrating agent • Tissue may remain in it for months without injury
CELLOSOLVE, ETHYLENE GLYCOL MONOETHYL ETHER
55
Tissues may be transferred from water or normal saline and stored for months without hardening or distortion • Avoids distortion and does not require graded dilutions
CELLOSOLVE, ETHYLENE GLYCOL MONOETHYL ETHER
56
Cellusolve combust at
43-48
57
Universal solvent-it dehydrates and clears • Miscible in all proportions with water, ether chloroform, acetone, and the hydrocarbons xylene, toluene, and benzene
TETRAHYDROFURAN
58
Rapid without excessive shrinkage and hardening; easier cutting of sections • Low toxicity; low fire and explosion
TETRAHYDROFURAN
59
6months exposure to tetrahydrofuran produces
CONJUNCTIVAL IRRITATION
60
For electron microscopy Dehydrating agent: Transition fluid: Substitute:
ETHANOL, PROPYLENE OXIDE, ACETONITRILE
61
softening agent for hard tissues
GLYCEROL
62
acts as a softening agent for hard tissues like tendons, nail, dense connective tissues, and keratin masses
PHENOL
63
_phenol is added to each 95% ethanol stations
4%
64
This will impair subsequent step
WATER
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