Yeast - Wikipedia
By the late 18th century two yeast strains used in brewing had been identified: Saccharomyces cerevisiae (top-fermenting yeast) and S. pastorianus (bottom-fermenting yeast).

Yeast | Definition & Uses | Britannica
Yeast, any of about 1,500 species of single-celled fungi, several of which are of economic importance or are pathogenic. Yeasts are found worldwide in soils and on plant surfaces and are especially abundant in sugary mediums, such as flower nectar and fruits.

How To Make Yeast the Old-Fashioned Way - Ask a Prepper
Learn how to make yeast from scratch using flour, water, and wild microbes. Discover this forgotten survival skill, why it matters when the grid fails, and how it gives you lasting independence.

What Are Yeasts and How Are They Used in Industry?
The most famous species of yeast is Saccharomyces cerevisiae, known affectionately as “baker’s yeast” or “brewer’s yeast.” This species has been a companion to humanity for thousands of years and remains a cornerstone of both traditional food production and modern biotechnology.

What is Yeast? All you need to know about yeast - Explore Yeast
Yeast enables natural fermentation that is used for making bread, beer, and other fermented food. Nutritional yeast is a good source of proteins, minerals, and vitamins.

Types of Yeast and the Best Ones for Baking - Simply Recipes
Everything you need to know about active dry, instant, and fresh yeast - how to use, how to store, how to substitute, and more! You may not know it, but yeast is everywhere: on the surface of fruits and vegetables, in the lees at the bottom of craft beer bottles, in the soil, and even on your skin.

How to Test Yeast to Know If It Is Still Good to Use - Martha Stewart
Yeast is a living, breathing organism, and its job is nothing short of magical: it transforms a simple mixture of flour, water, and salt into a flavorful, gorgeous loaf of homemade bread. Live yeast ensures fluffy breads, soft rolls, and the perfect pizza crust.

Yeast: Structure, Reproduction, and Uses - Microbe Online
Yeast is a unicellular eukaryotic cell. It is a saprophytic fungus and is found in sugary mediums like the juice of sugarcane and sweet fruits, the nectar of flowers, etc. Yeast is larger than most bacteria. It is non-motile and does not consist of flagella or any other organ of locomotion.

Yeast - an overview | ScienceDirect Topics
Yeasts are single cell, eukaryotic microorganisms classified in the fungi kingdom (Bennett, 1998; Ingraham, 2010). These microscopic fungi are generally about 3–4 μm in size, have a nuclear membrane and cell walls, but unlike plants, they contain no chloroplasts.

What Is Yeast? - The Spruce Eats
Yeast is a leavening agent used for baking that requires sugar, starch, warmth, and moisture to produce carbon dioxide. Here is our guide to buying and baking with Yeast