BY2012 Microbiology
Gallery of Saccharomyces
Saccharomyces cerevisiae
Baker’s Yeast or Brewer’s Yeast
Diagram and scanning electron micrograph of budding yeast cell
Saccharomyces cerevisiae
Baker’s Yeast or Brewer’s Yeast
Scanning electron micrograph of yeast cells with Escherichia coli
Saccharomyces Yeast Phylogeny
A Schematic of the Structure of the
Saccharomyces Cell Wall
SS
Mannoprotein
40%
GPI Anchor
β1-3 glucan
50%
Transmembrane
Protein
β1-6 glucan
8%
Chitin
2%
Saccharomyces – Cell Surface Features
Protease
treated
100 nm
The outer cell wall layer is composed mainly of mannoproteins (dense
zone arrowed), covalently bound to ß-1,6-glucan (light zone), can be
removed by protease treatment (right hand panel)
Saccharomyces Mannoproteins
[α1–6-Mannose]
Module
50-200
Wall Lattice
Saccharomyces cerevisiae
Colonies on Malt Extract Agar Plate
Saccharomyces cerevisiae
Gram stain of yeast cells
Saccharomyces cerevisiae
Budding yeast cells
Phase-contrast
microscopy (wet mount)
Methylene blue stain
Saccharomyces cerevisiae
Scanning electron micrographs of budding cells (arrowed)
Saccharomyces cerevisiae
Wet mount of yeast cells viewed by phase
contrast microscopy with green filter
Saccharomyces cerevisiae
Saccharomyces cerevisiae stained with rhodamine-labelled
antibodies view by UV microscopy
Saccharomyces cerevisiae
Colourised electron micrograph showing bud scars
(blue) on yeast cell surface
Yeast on Grapes
Grapes covered with yeast growth seen as white film (blush)
S. cerevisiae – Wine Making
Steel wine making vats
Yeast in Action
S. cerevisiae – Bread Making
Commercial dry yeast powder
Home-made leavened bread
– leavened = dough caused
to rise especially by yeast
fermentation
S. cerevisiae – Bread Making
Examples of unleavened breads
Examples of leavened breads
S. cerevisiae – Brewing Beer
Beer fermentation tanks
Yeast in Action
Yeast in Action
S. cerevisiae – Cider Brewing
Yeast in Action
S. cerevisiae from Brewing –
Yeast Autolysate Food Products
Switzerland
United Kingdom
South Africa
Australia
Food spreads made from yeast extract, a by-product of beer brewing