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Samenvatting van Biopt tot preparaat $5.68   Add to cart

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Samenvatting van Biopt tot preparaat

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een samenvatting van het onderdeel van biopt tot preparaat.

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  • May 30, 2022
  • 4
  • 2020/2021
  • Summary
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Van biopt tot preparaat:
Stap 1: Fixatie

- Doel:
 De morfologische cellulaire structuur + chemische bestanddelen behouden.
- Effecten:
 Preventie autolyse & putrefactie:
Autolyse: Lyse van cellen door ruptuur van de lysosomen.
Putrefactie: afbraak van weefsel (gaat samen met gasvorming) door bacteriële
activiteit.
 Betrouwbaar behouden van weefselbestandelen.
 Harden van weefsel -> weke weefsels worden gemanipuleerd(hersens).
 Stijgen brekingsindex -> beter waarneembaar.
 Beïnvloed kleuringstechnieken -> meer selectieve kleuring.
- Soorten:
 Formaldehyde:
 Gas opgelost in water -> formol 40%.
 Gebruikt in 10% oplossing.
 Fosfaatbuffer is nodig -> Door oxidatie vormt verzurend formolpigment.
 Ethylalcohol:
 Traag maar verhard voor lange tijd.
 Gecombineerd met Carnoy -> sneller.
 DENATURATIE van eiwitten, LOST vet OP -> niet voor elke coupe.
 Aceton:
 Analoog aan Ethylalcohol + glycogeen NIET BEWAARD -> geen gebruik meer.
 Alcoholische formol:
 Formol -> 10 ml
 Alcohol(90%) -> 90ml
 Fixatie polysacchariden.
 6-8 uur -> lang.
 Carnoy’s vloeistof:
 Alcohol(100%) -> 60ml
 Chloroform -> 30ml
 Azijnzuur -> 10ml
 Snelle, nucleaire fixatie.
 RER, Glycogeen behouden, Cytoplasmatische elementen vernietigd.
 Fixatie in 1-2 uur, Fixatie 3mm -> 15min.

Stap 2: Weefselbewerking

- Doel:
 Biopt klaarmaken om te snijden.
- Voorbereiding:
 Dehydratatie:
 Water uit weefsel halen -> dehydrateren.
 Opeenvolgende baden -> stijgend Alcohol%.

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