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What is the differences between the Petite and Grande strains of Saccharomyces cerevisiae?
Wiki User
∙ 13y ago
petite strain lacks a mitochondria so it is unable to yield energy from aerobic metabolism
Wiki User
∙ 13y ago
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Why do we have to get a diffrent flu vaccine every year?
The influenza virus is in a continuous state of mutation. Each year different strains become prominent. If the educated guesses of the disease control folks are accurate, they can produce a vaccine that will be aligned with the proteins on all of the most common strains for a given year. Occasionally they get it wrong and the vaccine is only effective against a fraction of the most common strains. Because the strains are different from year to year, the previous year's vaccination is not very likely to provide immunity for the currently most common strains.
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Strains that are in the minority at time of sampling, might swamp / kill-and-eat the strains of interest, simply because they grow better in "transit" conditions. Also, you lose any ability to estimate contamination levels at the time of sampling.
Humans have countered natural selection by medically correcting phenotypes?
Humans have countered natural selection through hybrid breeding. Even crossing a male donkey with a female horse produces a mule. Crossing certain corn strains with other corn strains to produce more grain per ear.
How radioisotopes are used in crop improvement?
Radioisotopes are used in crop management and improvement because they can be used to preserve. They are used to develop new strains of crop, also.
Why are viruses infamous and deadly on earth?
HIV is one of them. Some strains of Flu, like Bird Flu and Spanish Flu. And...uhh... I dont know anymore. =S
What is the genus of yeast?
Baker's yeast has the scientific name of Saccharomyces cerevisiae. This means that the genus of baker's yeast is Saccharomyces and the species is cerevisiae.
What has the author Alfred S Lewin written?
Alfred S. Lewin has written: 'Restriction endonuclease analysis of mitochondrial DNA from petite and grande strains of Saccharomyces cerevisiae'
What is 2-micron circle?
Some strains e.g. A364A D5[2]of yeast named as Saccharomyces cerevisiae posses a type of plasmid known as 2-micron circle.Recently it is found that it promotes recombination within bacterial transposon Tn5.
What are some of the adaptations of barley?
Yeasts are a growth form of eukaryotic microorganisms classified in the kingdom Fungi, with about 1,500 species currently described;Kurtzman, C.P., Fell, J.W. 2006. , Biodiversity and Ecophysiology of Yeasts, The Yeast Handbook, Springer. en.wikipedia.org/wiki/Yeast Baker's yeast is the common name for the strains of yeast commonly used as a leavening agent in baking bread and related products, where it converts the fermentable sugars present in the dough into carbon dioxide and ethanol. different yeast strains used in wine making, With the exception of a very small number of yeast species, all commercial yeast strains are different isolates from the species Saccharomyces cerevisiae, Saccharomyces bayanus, Yeasts that infect animals, Candida
Difference between bottom and top fermenting yeast?
Yeast are single-celled microorganisms that reproduce by budding. They are biologically classified as fungi and are responsible for converting fermentable sugars into alcohol and other byproducts. There are literally hundreds of varieties and strains of yeast. In the past, there were two types of beer yeast: ale yeast (the "top-fermenting" type, Saccharomyces cerevisiae) and lager yeast (the "bottom-fermenting" type, Saccharomyces uvarum, formerly known as Saccharomyces carlsbergensis). Today, as a result of recent reclassification of Saccharomyces species, both ale and lager yeast strains are considered to be members of S. cerevisiae.Top-Fermenting YeastAle yeast strains are best used at temperatures ranging from 10 to 25°C, though some strains will not actively ferment below 12°C (33). Ale yeasts are generally regarded as top-fermenting yeasts since they rise to the surface during fermentation, creating a very thick, rich yeast head. That is why the term "top-fermenting" is associated with ale yeasts. Fermentation by ale yeasts at these relatively warmer temperatures produces a beer high in esters, which many regard as a distinctive character of ale beers.Top-fermenting yeasts are used for brewing ales, porters, stouts, Altbier, Kölsch, and wheat beers.Bottom-Fermenting YeastLager yeast strains are best used at temperatures ranging from 7 to 15°C. At these temperatures, lager yeasts grow less rapidly than ale yeasts, and with less surface foam they tend to settle out to the bottom of the fermenter as fermentation nears completion. This is why they are often referred to as "bottom" yeasts. The final flavour of the beer will depend a great deal on the strain of lager yeast and the temperatures at which it was fermented.Some of the lager styles made from bottom-fermenting yeasts are Pilsners, Dortmunders, Märzen, Bocks, and American malt liquors.
Differences between A and R strains of streptococcus pneumoniae?
One type responds to antibiotics and the other does not. In other words type you can kill and the other type can kill you.
Can you substitute baker's yeast for brewer's yeast?
Different strains of Saccharomyces cerevisiae produce different proportions of carbon dioxide and alcohol. Baker's yeast is a blend of several strains of Saccharomyces cerevisiae chosen for their flavor and ability to make carbon dioxide, which causes bread to rise. Brewer's yeast is made of strains chosen for their alcohol-producing ability and tends to have a bitter flavor. Brewer's yeast is considered an inactive yeast while baker's yeast is an active yeast. In an active yeast the yeast cells are still alive, whereas they are killed in the process of making inactive yeasts, like brewer's yeast.
What is the difference between top fermentation and bottom fermentaion yeast?
Bottom fermenting yeast, which produce Lager beers, are fermented at lower temperatures (around 0-5 degrees C), and take roughly twice as long to ferment as ales, which are procuced with top fermenting yeast Top fermenting yeast produce Ales and are fermented at higher temperatures (around 10-15 degrees C), and have a shorter fermentation time.
What has the author Kenneth Andrew Borchardt written?
Kenneth Andrew Borchardt has written: 'Metabolic differences between strains of Escherichia coli resistant and susceptible to bacteriophage' -- subject(s): Escherichia coli, Immunity
Can you use active dry yeast rather than fresh yeast in making plum brandy?
Short Answer: Yes Long Answer: Brandy is a distilled spirit. Making it involves fermentation (using yeast) then distillation to raise the alcohol concentration. I currently use active dry yeast for fermenation as a base for distillation because it has a longer shelf life than fresh yeast. Be aware that there are many different strains of Bakers/Brewers Yeast (Saccharomyces Cerevisiae) and each has slightly different characteristics. All have the ability to convert simple sugars into ethanol & CO2 - their individual suitability to produce good plum brandy is less assured.
What is a fruitfly?
Fruitfly, scientifc name Drosophila melanogaster (dew-loving black-belly), is a model organism used in biological studies. Since they are small, easy to reproduce, has a decoded genome and has many mutant strains, it is most oftenly used in genetics and molecular biology studies involving a model multicellular eukaryotic organism. Other model organisms include Arabidopsis thaliana, a model multicellular plant, zebrafish, a model fish, rats and mice, model mammals, Escherichia coli, a model bacteria, saccharomyces cerevisiae (yeast), a model unicellular eukaryote, and T4 phage, a model virus.
How do you make wine?
Wines are made through the fermentation process. Grapes are squeezed to remove the juices. Yeast is added to the juice and it converts some of the sugars into alcohol. Differences occur by varying the type of grapes, whether or not they are skinned before squeezing, the types of yeast that are used and how long they are aged. If you fill a water bottle with grape juice and poke a hole in the top it will eventually ferment and turn into wine. Be careful though, if the hole is too big it will turn the grape juice into vinegar.
