Ethanol has been a widely used ingredient that significantly contributes to crude oil reduction thereby aids in controlling environmental pollution. The production of ethanol is a biotechnological process and could be achieved via microbial fermentation of various feedstocks such as sucrose, starch, lignocellulosic and algal biomass. Among the wide variety of microbes, yeasts have their prominence due to their ability to produce high ethanol by consuming a broad type of sugars.
Fig. Ethanol fermentation Pathway inside yeast
The efforts towards identifying novel microbes leading to an increase in yeasts every year and more than 2500 yeast species have been identified till 2005 while the number of yeast species on the earth is expected to reach 150000 . Various types of yeast strains have been used in fermentation for ethanol production including hybrid, recombinant and wild-type yeasts that displays the capability of utilizing different carbon source. The diversity of yeast cells depends on their source and will exhibit various phenotypic characteristics like cell size, shape, and color. The habitat where these yeasts grow influences the phenotypic characteristics and the influenced by the habitat and most yeasts have a width in the range of 1–10 µm, ellipsoidal or ovoid in shape, and have creamy color colonies 
Since ancient times yeasts such as Saccharomyces cerevisiae has been commonly employed in alcohol production and the efficiency of fermentation depends on several factors such as temperature, sugar concentration, pH, fermentation time, agitation rate, and inoculum size, etc. However, there are common challenges that inhibit yeast growth during fermentation includes the rise in temperature (35–45 °C) and ethanol concentration (over 20%), etc. . Yeast’s metabolic rate increase as the temperature Increase and increased ethanol concentration can cause inhibition to growth and viability [4,5]. The inability of S. cerevisiae to grow in media containing a high level of alcohol leads to the inhibition of ethanol production . The efficiency of ethanol production on an industrial scale will be increased by using yeasts that are tolerant to inhibitors  and yeasts that are ethanol-tolerant and thermotolerant yeast.
We, Catalysts Biotechnologies has such yeast strains developed to handle the harsh conditions that arise due to the variety of feedstocks and the process conditions. Our novel yeast strains are well received in the market that provides very good productivity and yields despite the varying process conditions.