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Topic: Mitochondria

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In the News (Sun 21 Apr 19)

  BioMed Central | Full text | Mitochondria from cultured cells derived from normal and thiamine-responsive ...
Mitochondria were isolated from lymphoblasts derived from normal (squares) or TRMA individuals (circles) were incubated for 15 minutes with various concentrations of radioactive thiamine.
Mitochondria were isolated from normal (open squares) or TRMA (open circles) lymphoblasts and were incubated for 15 minutes with various concentrations of radioactive ThDP.
Uptake of thiamine and ThDP by mitochondria was determined by a rapid filtration procedure [26,28].
www.biomedcentral.com /1471-2091/3/8   (4255 words)

  Cellular Respiration
Mitochondria are membrane-enclosed organelles distributed through the cytosol of most eukaryotic cells.
This has strengthened the theory that mitochondria are the evolutionary descendants of a bacterium that established an endosymbiotic relationship with the ancestors of eukaryotic cells early in the history of life on earth.
Perhaps rickettsias are the closest living descendants of the endosymbionts that became the mitochondria of eukaryotes.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/C/CellularRespiration.html   (1353 words)

  Mitochondria - MSN Encarta
Mitochondria are responsible for converting nutrients into the energy-yielding molecule adenosine triphosphate (ATP) to fuel the cell's activities.
This function, known as aerobic respiration, is the reason mitochondria are frequently referred to as the powerhouse of the cell.
Mitochondria are unusual organelles in that they contain deoxyribonucleic acid (DNA), typically found in the cell’s nucleus, and ribosomes, protein-producing organelles abundant in the cytoplasm.
encarta.msn.com /encyclopedia_761582165/Mitochondria.html   (793 words)

 Mitochondria   (Site not responding. Last check: 2007-11-07)
Mitochondria are able to modify their structure to meet the changing requirements of the cell.
Mitochondria may fuse or increase in size to form giant mitochondria or megamitochondria, and they are also able to divide in a sequence that morphologically resembles bacterial division.
Mitochondria tend to locate near the structures were the energy is required, as illustrated by the close association with rough endoplasmic reticulum in cells with high synthetic activity.
sup.ultrakohl.com /uscap/loreta.htm   (1703 words)

  Mitochondrion - Wikipedia, the free encyclopedia
Mitochondria are sometimes described as "cellular power plants", because their primary function is to convert organic materials into energy in the form of ATP.
Because eggs destroy the mitochondria of the sperm that fertilize them, the mitochondrial DNA of an individual derives exclusively from the mother.
As mitochondria contain ribosomes and DNA, and are only formed by the division of other mitochondria, it has been suggested that they were originally derived from endosymbiotic prokaryotes.
en.wikipedia.org /wiki/Mitochondria   (1405 words)

Mitochondria contain their own DNA but over time many genes have been lost to the cell nucleus, which now controls mitochondrial behaviour and function.
Mitochondria cannot be made by the cell but instead arise from division of pre-existing "parental" mitochondria much like the free-living bacteria we know today.
To study mitochondria in living plant cells the gfp gene was fused to a short section of plant DNA that acts like a postcode by directing the GFP, synthesised in the cytoplasm, to the mitochondria.
www.st-andrews.ac.uk /~dclogan/dlex.htm   (677 words)

 The Individualist: Mitochondria   (Site not responding. Last check: 2007-11-07)
Mitochondria are sometimes described as "cellular power plants," because their primary function is to convert organic materials into energy in the form of ATP via the process of oxidative phosphorylation.
Mitochondria usually have their own DNA (mtDNA); according to the generally accepted Endosymbiotic theory, they were originally derived from external organisms.
Mitochondria replicate their DNA and divide mainly in response to the energy needs of the cell; in other words their growth and division is not linked to the cell cycle.
www.dadamo.com /wiki/wiki.pl/Mitochondria   (989 words)

 Mitochondrial Substructure
The mitochondria are able to code for part of their proteins with these molecular tools.
After it enters the mitochondria, it is broken down to a 2 carbon molecule by a special enzyme (see text for more details about the biochemistry of each step).
This reflects the orientation of cytochrome C. It is found in space inbetween cristae membranes which suggests it is next to the outer leaflet of the cristae membrane, rather than the inner leaflet (opposite to that of the elementary particles, or ATP synthetase).
cellbio.utmb.edu /cellbio/mitochondria_1.htm   (1851 words)

Mitochondria provides about 90% of the energy that cells, and thus tissues, organs and the body as a whole needs to function.
Mitochondria are also involved in ageing, to the extent that it is now recognised that mutations in mitochondrial DNA do accumulate in ageing organisms, including humans and other mammals.
Mitochondria are considered to have a relatively high mutation rate.
homepages.ihug.co.nz /~lcables/mitochondria.htm   (1607 words)

 Mitochondria | World of Genetics
Mitochondria are double membrane-bound cytoplasmic organelles (they are enclosed by two independent lipoprotein membranes) found in almost all higher plant and animal cells.
Mitochondria serve as the principle energy source for all animal cells and for plant cells when light is absent.
It is widely accepted by scientists that mitochondria probably arose sometime far back in history as a result of a symbiotic relationship between a prokaryotic (bacterial-like) cell and a nucleus-containing proto-eukaryotic cell.
www.bookrags.com /research/mitochondria-wog   (309 words)

 The British Society for Cell Biology - Mitochondria
Mitochondria are also thought to influence, by exercising a veto, which eggs in a woman should be released during ovulation and which should be destroyed by programmed cell death (apoptosis).
In mitochondria the outer membrane is thought, in effect to be derived from that part of the cell membrane of the eucaryotic cell that formed the vesicle containing the engulfed the visiting bacterium.
Mitochondria are large organelles found in the cytoplasm of all plant and animal cells.
www.kcl.ac.uk /kis/schools/life_sciences/biomed/bscb/softcell/mito.html   (1709 words)

 Origin of Mitochondria in Eukaryotic Cells
Oxygen is necessary for the eukaryotic cell because mitochondria use it as the terminal electron acceptor in the electron transport chain, ultimately resulting in a proton gradient which drives ATP synthesis.
Mitochondria are one of the larger organelles in the eukaryotic cell, ranging from 0.3-1.0 andm by 5-10 andm.
If mitochondria were once free-living bacteria, the thinking goes, they could be expected to exhibit some vestigial remnants of their former condition even though they are organelles today.
cas.bellarmine.edu /tietjen/images/origin_of_mitochondria_in_eukary.htm   (1660 words)

 Alibris: Mitochondria
Chloroplasts and mitochondria contain their own genomes and protein-synthesizing systems, but only a fraction of the genes required for the proper function of these organelles are specified by the genomes.
Mitochondria are organelles in each cell outside the nucleus and are the energy source of all cells.
Mitochondria is a unique and comprehensive guide to the key techniques used in both enzymology and molecular biology studies.
www.alibris.com /search/books/subject/Mitochondria   (1039 words)

Mitochondria are the energy factories of the cells.
Just as the chloroplasts in plants act as sugar factories for the supply of ordered molecules to the plant, the mitochondria in animals and plants act to produce the ordered ATP molecules as the energy supply for the processes of life.
This ATP production by the mitochondria is done by the process of respiration, which in essence is the use of oxygen in a process which generates energy.
hyperphysics.phy-astr.gsu.edu /hbase/biology/mitochondria.html   (226 words)

 Mitochondria   (Site not responding. Last check: 2007-11-07)
Mitochondria are found in the cytoplasmic matrix of most cells.
The mitochondria move to regions of the cell where they are most required.
mitochondria produces energy packets in the form of ATP molecules and are thus referred to as the "power houses" of cells.
www.botany.uwc.ac.za /sci_ed/grade10/cells/mitochondria.htm   (171 words)

 Mitochondria - The ALS Association
Mitochondria are especially critical to the motor neurons that die in ALS, as these cells must meet extraordinary demands for cellular energy.
Mitochondria play a role for removing cells when they are not needed in the growing animal, or later, in an adult, if cells are not working properly.
Mitochondria, as stated earlier, are also involved in the process called apoptosis, a deliberate removal of cells.
www.alsa.org /research/article.cfm?id=822   (578 words)

 Diabetes in the elderly linked to fewer cellular 'power plants'
Mitochondria within the cells convert glucose and fatty acids into energy via oxidation.
Thus, reasoned the researchers, the fatty molecules in the muscle cells might be accumulating due to defects in the cells' fat-burning mitochondria.
More basic research is needed to understand whether the number or individual activity of mitochondria are reduced in the elderly, as well as the role of mutations or other factors in such age-related reductions, he said.
www.eurekalert.org /pub_releases/2003-05/hhmi-dit051403.php   (872 words)

 The Guide: The mitochondria   (Site not responding. Last check: 2007-11-07)
The mitochondria each have two membranes, one on the outside which separates it from the cell's
Interestingly, biologists have found that mitochondria have their own
This evidence suggests that perhaps mitochondria were once separate living
library.thinkquest.org /27819/ch3_6.shtml   (106 words)

Mitochondria occur in both plant and animal cells as sausage shaped bodies closely packed in regions actively using ATP energy.
Mitochondria still have a small chromosome of their own and make some of their own proteins, showing that they were once separate bacteria.
During reproduction mitochondria are passed on by the egg cell.
www.historyoftheuniverse.com /mitochon.html   (228 words)

 Cell-Biology.com: Cellular Organelles   (Site not responding. Last check: 2007-11-07)
Mitochondria are mostly protein, but some lipid, DNA and RNA are present.
Most mitochondria have flat shelf-like cristae, but those in steroid secreting cells may have tubular cristae.
The metabolic activity of the cell is related to the number of cristae and the number of mitochondria within a cell.
www.cell-biology.com /organ.html   (2233 words)

Mussels have two types of mitochondria and mtDNA: one that is transmitted from the mother to daughters and sons (the F type), and one that is transmitted from the father to daughters and sons (the M type).
It is possible that F mitochondria have in their outer membrane molecules that specifically fit a protein that acts as a female-steroid receptor.
Though mitochondria are thought to be descended from a bacterium (or from a common ancestor of bacteria, mitochondria and chloroplasts) the conditions inside a mitochondrion are likely to be much more hostile to DNA than those inside a bacterium.
www.geocities.com /acgyles/mito.html   (9179 words)

 Mitochondria   (Site not responding. Last check: 2007-11-07)
Mitochondria have a double membrane structure, with the inner membrane being highly folded.
Mitochondria are the primary energy producers in cells.
Mothers give genes and cytoplasm to their children in their egg cells, since mitochondria are in the cytoplasm and reproduce themselves they only are inherited from mothers.
www.winterwren.com /apbio/cellorganelles/mito.html   (332 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
Another interesting feature is that unlike the rather static stiff view we get of mitochondria from electron micrographs, mitochondria move around the cell, constantly changing their shape, and may fuse and separate with other mitochondria.
Mitochondria vary greatly in size, but typically they are about 0.5 µm wide and about 7 µm in length.
As we have mentioned previously, mitochondria have their own circular DNA and ribosomes, although as we will see later, a large percentage of their proteins are coded for by the cell nucleus.
martin.parasitology.mcgill.ca /JIMSPAGE/CELLBIOL/mit.htm   (719 words)

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