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BIOL 121 Impact of Microbes Full Lecture Notes £3.79   Add to cart

Lecture notes

BIOL 121 Impact of Microbes Full Lecture Notes

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Lecture notes from module BIOL 121, covering all 12 lectures, including pictures and diagrams. The notes are written in bullet point form so are easy to read and include all relevant information from the lectures given. Lecture 1: Introduction Lecture 2: Bacterial nutrition and growth Lecture ...

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  • May 4, 2023
  • 77
  • 2022/2023
  • Lecture notes
  • Muhammad munir
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mogriffiths22
Lecture 12 Amoebae
Amoebae
One macronucleus

Most are aerobic

Most are heterotrophic

Some mixotrophic

Asexual reproduction only

No specific fission plane

Some move, some are stationary

Most publicised protozoan

Naked amoebae
Amoeba proteus

Move by cytoplasmic streaming

Produce pseudopodia on surfaces

Feed by direct inception of prey

Raptorial feeding

No specific location for ingestion - can be anywhere

3 cell forms

Trophozoites - the feeding form

Cysts - all produce a resting
stage

Floating form - stiffened
pseudopodia for dispersal




Lecture 12 Amoebae 1

, Shelled amoebae
enclosed in a shell (’test’)

Shell can be made of anything

Intrashellular cytoplasm with in test

Projet extrashellular cytoplasm to move and/or feed

Raptorial or diffusion feeding

can produce cysts

Testate amoebae
freshwater, marine and terrestrial

Raptorial feeding

Foraminiferans
marine only

CaCO3 tests

diffusion feeding

Diffusion feeding
stationary predator captures prey with sticky extrashellular cytoplasm
(’axopodia’)

Radiolarians
marine only

Silica tests

Diffusion feeding

Heliozoans
Freshwater

Silica tests

Diffusion feeding


Ecological impacts

Lecture 12 Amoebae 2

, In the environment - they are everywhere

good = all of the protists

microbes: base of every food chain

keep bacterial populations healthy

Important in nutrient cycling

Bad = mainly amoebae

Allow evolution of new bacterial pathogens

Act as a ‘reservoir’ for them too

Predation stops bacteria reaching stationary phase
predation keeps bacteria in log
phase: bacteria are constantly
feeding and declining so they are
constantly active




Lecture 12 Amoebae 3

, Bad ecological impact - evolution of pathogens


Lecture 12 Amoebae 4

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