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Osmophiles
An osmophile is an extremophile microorganism adapted to environments generating high osmotic pressures, such as aqueous solutions with high salt or sugar concentrations (''e.g.'', brines or sirups). Osmophiles are similar to halophiles (salt-loving organisms) in that a critical aspect of both types of environment is their low water activity, aW. High sugar concentrations represent a growth-limiting factor for many microorganisms, yet osmophiles protect themselves against this high osmotic pressure by the synthesis of osmoprotectants such as Alcohol (chemistry), alcohols and amino acids. Many osmophilic microorganisms are yeasts; some bacteria are also osmophilic. Osmophilic yeasts are important because they cause food spoilage in the sugar and sweet goods industry, with products such as fruit juices, fruit juice concentrates, liquid sugars (such as golden syrup), honey, and in some cases marzipan. Among the most osmophilic are: See also * * References * * {{Ext ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saccharomyces Cerevisiae
''Saccharomyces cerevisiae'' () (brewer's yeast or baker's yeast) is a species of yeast (single-celled fungal microorganisms). The species has been instrumental in winemaking, baking, and brewing since ancient times. It is believed to have been originally isolated from the skin of grapes. It is one of the most intensively studied eukaryotic model organisms in molecular and cell biology, much like '' Escherichia coli'' as the model bacterium. It is the microorganism which causes many common types of fermentation. ''S. cerevisiae'' cells are round to ovoid, 5–10 μm in diameter. It reproduces by budding. Many proteins important in human biology were first discovered by studying their homologs in yeast; these proteins include cell cycle proteins, signaling proteins, and protein-processing enzymes. ''S. cerevisiae'' is currently the only yeast cell known to have Berkeley bodies present, which are involved in particular secretory pathways. Antibodies again ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Debaryomyces
''Debaryomyces'' is a genus of yeast Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom (biology), kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are est ...s in the family Saccharomycetaceae. Species *'' D. artagaveytiae'' *'' D. carsonii'' *'' D. castellii'' *'' D. coudertii'' *'' D. etchellsii'' *'' D. globularis'' *'' D. hansenii'' *'' D. kloeckeri'' *'' D. kursanovii'' *'' D. marama'' *'' D. macquariensis'' *'' D. melissophilus'' *'' D. mrakii'' *'' D. mycophilus'' *'' D. nepalensis'' *'' D. occidentalis'' *'' D. oviformis'' *'' D. polymorphus'' *'' D. prosopidis'' *'' D. pseudopolymorphus'' *'' D. psychrosporus'' *'' D. robertsiae'' *'' D. singareniensis'' *'' D. udenii'' *'' D. vanrijiae'' *'' D. vietnamensis'' *'' D. vindobonensis'' *'' D. yamadae'' References Saccharomycetaceae Yeasts Osmophiles {{yeast-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saccharomyces Bailii
''Zygosaccharomyces bailii'' is a species in the genus '' Zygosaccharomyces''. It was initially described as ''Saccharomyces bailii'' by Lindner in 1895, but in 1983 it was reclassified as ''Zygosaccharomyces bailii'' in the work by Barnett et al. Spoilage resulting from growth of the yeast '' Zygosaccharomyces'' is widespread, which has caused significant economic losses to the food industry. Within this genus, ''Z. bailii'' is one of the most troublesome species due to its exceptional tolerance to various stressful conditions. A wide range of acidic and/or high-sugar products such as fruit concentrates, wine, soft drinks, syrups, ketchup, mayonnaise, pickles, salad dressing, etc., are normally considered to be shelf-stable, i.e. they readily inactivate a broad range of food-borne microorganisms. However, these products are still susceptible to spoilage by ''Z. bailii''. Morphology and modes of reproduction ''Zygosaccharomyces bailii'' vegetative cells are usually ellipsoid, n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saccharomyces Rouxii
''Zygosaccharomyces rouxii'' is a species of yeast in the genus Zygosaccharomyces. Initially described as ''Saccharomyces rouxii'' by Boutroux in 1883, it was then moved to the genus ''Zygosaccharomyces'' in the work of Barnett ''et al''. It is remarkably tolerant of high concentrations of sugar or salt, making it a spoilage agent of otherwise stable foods, but also present in fermentation of products such as soy sauce or balsamic vinegar. Description It is a diploid, homothallic, and osmophilic (capable of withstanding high osmotic pressures, such as high concentrations of sugar) yeast. It produces ethanol by alcoholic fermentation. It is found on grapes, in urine, fermented foods, syrups (maple), honey, grape juice concentrate, marzipan, candied fruit, miso, marmalade, and wine. It is capable of fermenting dextrose (D-glucose) and maltose but has no fermentation activity on sucrose and lactose. Cells are small, round or oval and linked together in chains. It is particu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extremophile
An extremophile () is an organism that is able to live (or in some cases thrive) in extreme environments, i.e., environments with conditions approaching or stretching the limits of what known life can adapt to, such as extreme temperature, pressure, radiation, salinity, or pH level. Since the definition of an extreme environment is relative to an arbitrarily defined standard, often an anthropocentric one, these organisms can be considered Dominance (ecology), ecologically dominant in the evolutionary history of the planet. Dating back to more than 40 million years ago, extremophiles have continued to thrive in the most extreme conditions, making them one of the most abundant lifeforms. The study of extremophiles has expanded human knowledge of the limits of life, and informs speculation about extraterrestrial life. Extremophiles are also of interest because of their potential for bioremediation of environments made hazardous to humans due to pollution or contamination. Character ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amino Acid
Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. Only these 22 appear in the genetic code of life. Amino acids can be classified according to the locations of the core structural functional groups ( alpha- , beta- , gamma- amino acids, etc.); other categories relate to polarity, ionization, and side-chain group type ( aliphatic, acyclic, aromatic, polar, etc.). In the form of proteins, amino-acid '' residues'' form the second-largest component (water being the largest) of human muscles and other tissues. Beyond their role as residues in proteins, amino acids participate in a number of processes such as neurotransmitter transport and biosynthesis. It is thought that they played a key role in enabling life on Earth and its emergence. Amino acids are formally named by the IUPAC- IUBMB Joint Commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallemia Sebi
''Wallemia sebi'' is a xerophilic fungus of the phylum Basidiomycota. It is commonly found on highly sugared or salted materials, such as jams, bread, cakes, sugar, bacon, salted meats, and salted fish. It is also found in indoor air, house dust, and soil. One distinctive feature of ''W. sebi'' is its relationship with water activity. Most fungi are profoundly affected by the availability of water. The ability to tolerate environments with low water activity has been found mostly in Ascomycota, but rarely in Basidiomycota. However, ''W. sebi.'' can adjust its morphology and physiology to adapt to different environmental conditions and survive osmotic stress. ''Wallemia sebi'' have lower limits for growth below water activity of 0.75 (0.69-0.75) aw, while most microorganisms are limited to 0.95 and above. ''Wallemia sebi'' has been isolated from hair, hay, textiles and man. It can grow slowly without additional solute in the growth medium, and form small, reddish-brown, powdery ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marzipan
Marzipan is a confectionery, confection consisting primarily of sugar and almond meal (ground almonds), sometimes augmented with almond oil or extract. It is often made into Confectionery, sweets; common uses are chocolate-covered marzipan and small marzipan imitations of fruits and vegetables. It can also be used in biscuits or rolled into thin sheets and glazed for icing cakes, primarily birthday cakes, wedding cakes and Christmas cakes. Marzipan may also be used as a baking ingredient, as in stollen or banket (food), banket. In some countries, it is shaped into small figures of animals as a traditional treat for New Year's Day or Christmas. Marzipan is also used in Roscón, Tortell, and in some versions of king cake eaten during the Carnival season. Around the world Europe The Geographical indications and traditional specialities in the European Union recognize two marzipans in Europe: one in Toledo (Spain) and one in Lübeck (Germany). Southern Europe In Spain, ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Food Spoilage
Food spoilage is the process whereby food becomes unsuitable to ingest by a person; it is a matter of food safety. Bacteria and various fungi are the causes of spoilage, and can create serious consequences for consumers, but there are preventive measures that can be taken. The precise cause of the process is due to many outside factors as a side-effect of the type of product it is, as well as how the product is packaged and stored. Food spoilage is the reason for food preservation, to extend shelf life. Processed meat, Meat is processed, Frozen food, food is frozen, and Canning, food is canned. Due to spoilage, one-third of the world's food produced for human consumption is lost every year. Bacteria Some bacteria are responsible for the spoilage of food. When bacteria breaks down the food, acids and other waste products are generated in the process. While the bacteria itself may or may not be harmful, the waste products may be unpleasant to taste or may even be harmful to one's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of Prokaryote, prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit the air, soil, water, Hot spring, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria play a vital role in many stages of the nutrient cycle by recycling nutrients and the nitrogen fixation, fixation of nitrogen from the Earth's atmosphere, atmosphere. The nutrient cycle includes the decomposition of cadaver, dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yeast
Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom (biology), kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are estimated to constitute 1% of all described fungal species. Some yeast species have the ability to develop multicellular characteristics by forming strings of connected budding cells known as pseudohyphae or false hyphae, or quickly evolve into a Multicellular organism, multicellular cluster with specialised Organelle, cell organelles function. Yeast sizes vary greatly, depending on species and environment, typically measuring 3–4 micrometre, μm in diameter, although some yeasts can grow to 40 μm in size. Most yeasts reproduce asexual reproduction, asexually by mitosis, and many do so by the asymmetric division process known as budding. With their single-celled growth habit, yeasts can be contrasted with Mold (fungus), molds, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcohol (chemistry)
In chemistry, an alcohol (), is a type of organic compound that carries at least one hydroxyl () functional group bound to a Saturated and unsaturated compounds, saturated carbon atom. Alcohols range from the simple, like methanol and ethanol, to complex, like sugar alcohols and cholesterol. The presence of an OH group strongly modifies the properties of Hydrocarbon, hydrocarbons, conferring Hydrophile, hydrophilic (water-loving) properties. The OH group provides a site at which many reactions can occur. History The flammable nature of the exhalations of wine was already known to ancient natural philosophers such as Aristotle (384–322 BCE), Theophrastus (–287 BCE), and Pliny the Elder (23/24–79 CE). However, this did not immediately lead to the isolation of alcohol, even despite the development of more advanced distillation techniques in second- and third-century Roman Egypt. An important recognition, first found in one of the writings attributed to Jabir ibn Hayyan, J� ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
