| wild yeast | Any of the uncultivated forms of yeast's, useless as ferments and sometimes pathogenic. (05 Mar 2000) |
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| compressed yeast | The moist living cells of Saccharomyces cerevisiae combined with a starchy or absorbent base. (05 Mar 2000) |
| cultivated yeast | A form of yeast propagated by culture and used in breadmaking, brewing, etc. (05 Mar 2000) |
| primary dried yeast | A source of dried yeast; obtained from suitable strains of Saccharomyces cerevisiae grown in media other than those required for the production of beer. (05 Mar 2000) |
| syndrome, yeast | The yeast Candida has been thought to cause a syndrome with a number of non-specific problems including fatigue, loss of appetite, headache, short-attention span, depression and all manner of intestinal irregularities. There is no scientific evidence to support the existence of the yeast syndrome (also called the yeast connection). (12 Dec 1998) |
| dried yeast | The dry cells of a suitable strain of Saccharomyces cerevisiae; brewers' dried yeast, debittered brewers' dried yeast, or primary dried yeast are the sources of dried yeast; it contains not less than 45% of protein, and in 1 g not less than 0.3 mg of nicotinic acid, 0.04 mg riboflavin, and 0.12 mg thiamin hydrochloride; used as a dietary supplement. (05 Mar 2000) |
| yeast | <fungus> Yeast is the colloquial name for single-celled members of the fungal families, ascomycetes, basidiomycetes and imperfect fungi that tend to be unicellular for the greater part of their life cycle. Commercially important yeasts include Saccharomyces cerevisiae, pathogenic yeasts include the genus Candida. See: Schizosaccharomyces pombe. (18 Nov 1997) |
| yeast artificial chromosome | <molecular biology> A vector system that allows extremely large segments of DNA to be cloned. Useful in chromosome mapping, contiguous yeast artificial chromosomes covering the whole Drosophila genome and certain human chromosomes are available. Acronym: YAC (15 Nov 1997) |
| yeast artificial chromosomes | Yeast DNA sequences that have incorporated into them very large foreign DNA fragments; the recombinant DNA is then introduced into the yeast by transformation; the use of yeast artificial chromosomes permits the cloning of large genes with their flanking regulatory sequences. (05 Mar 2000) |
| yeast autolysate | <cell biology> This substance is used as a culture medium and a food flavouring, it is made by breaking down yeast with intracellular enzymes. (06 May 1997) |
| yeast, dried | The dry cells of any suitable strain of saccharomyces cerevisiae or candida utilis. It can be obtained as a by-product from the brewing of beer or by growing on media not suitable for beer production. Dried yeast serves as a source of protein and vitamin b complex. (12 Dec 1998) |
| yeast extract agar | A medium used to induce sporulation and reduce vegetative growth in the cultivation of fungi. (05 Mar 2000) |
| yeast infection | <gastroenterology, microbiology, oncology> Infection with a fungus of the genus Candida. It is usually a superficial infection of the moist cutaneous areas of the body and is generally caused by Candida albicans, it most commonly involves the skin (dermatocandidiasis), oral mucous membranes (oral candidiasis), respiratory tract (bronchocandidiasis) and vagina (vaginal candidiasis or thrush). Rarely there is a systemic infection or endocarditis. Oral candidiasis: describes a fungal (yeast) infection of the oral cavity due to Candida. It is common in infants, diabetics or those on chemotherapy and is well recognised in patients with HIV infection and AIDS. Oesophageal candidiasis: Infection of the oesophagus by the yeast-like fungus Candidal albicans. Usually occurs in the immunocompromised individual (AIDS or following chemotherapy). Oral candidiasis is a predisposing factor but oesophageal involvement can occur without evidence of infection in the oral cavity. Symptoms include difficulty swallowing, pain on swallowing and oral lesions. Diagnosis is made using endoscopy. Treatment is with antifungal agents such as ketoconazole or fluconazole. Synonym: moniliasis, candidosis, oidiomycosis, blastodendriosis. (16 Dec 1997) |
| yeast RNase | <enzyme> An enzyme catalyzing the exonucleolytic cleavage of RNA to yield 3'-phosphomononucleotides. Synonym: RNase U4. (05 Mar 2000) |
| yeast syndrome | <syndrome> The yeast candida has been thought to cause a syndrome with a number of non-specific problems including fatigue, loss of appetite, headache, short-attention span, depression and all manner of intestinal irregularities. There is no scientific evidence to support the existence of the yeast syndrome (also called the yeast connection). (12 Dec 1998) |