The Ancestor Cell - Factbites

The Ancestor Cell - Factbites
Where results make sense
About us | Why use us? | Reviews | PR | Contact us

Topic: The Ancestor Cell

Note: these results are not from the primary (high quality) database.

In the News (Fri 25 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	"My Name is LUCA -- The Last Universal Common Ancestor" by Anthony M. Poole, Ph.D.
		LUCA is short for Last Universal Common Ancestor, and it is from this 'organism' that every living cell on the planet has descended.
		This theory argues that the mitochondrion, sometimes called the powerhouse of the cell, was originally a bacterial cell that took up residence in the ancestor of modern eukaryotes.
		LUCA does not represent the earliest stage in the evolution of life -- it is widely accepted that before the evolution of proteins and DNA (which are common to all cellular life) there was a period where RNA carried out the roles now performed by proteins and DNA [Jeffares and Poole 2000].
	www.actionbioscience.org /newfrontiers/poolepaper.html

	Clues to the Last Common Ancestor :: Astrobiology Magazine :: Search for Life in the Universe
		Eventually, she hopes to enumerate a set of proteins that were the ancestors of the proteins that performed all of the cellular functions in the Last Common Ancestor.
		She and her colleagues at The Marine Biological Laboratory in Woods Hole, Massachusetts, are looking for molecular traces of precursors to the last common ancestor of all modern cells.
		"Last Common Ancestor" is the term used by scientists to describe the ancient cell that ultimately gave rise to the three great domains of life: Archaea, Bacteria and Eukarya.
	www.astrobio.net /news/article216.html

	"What is the last universal common ancestor (LUCA)?" by Anthony M. Poole, Ph.D.
		The question they are asking is, "which features of the archaea, bacteria and eukaryotes can be traced back to their common ancestor, LUCA?" This should be a very simple task -- simply compare all three groups and choose the features that are common to all.
		These researchers are trying to reconstruct LUCA, the cell from which all life has evolved.
		His research to date has centered around questions in early evolution, and his current focus is on the origins of DNA and the origins of the eukaryote cell.
	www.actionbioscience.org /newfrontiers/poolearticle.html

	What was the ancestry of life on Earth?
		He sees "the universal ancestor" as not one cell, but a kind of cellular mist, in which genes transfer from one droplet to the other like molecules of water vapor (my analogy, not his).
		The obvious way to approach this question of the first living thing is to look at very simple cells, and figure out which is the most primitivethat is, which has the potential for being the original first cell that was the ultimate ancestor of all life on Earth.
		It is theoretically easier to determine what LUCA was: the Last Universal Common Ancestor of all the living things still surviving on Earth.
	www-geology.ucdavis.edu /~cowen/HistoryofLife/universalancestor.html (593 words)

	Scientists Recreate Genome of Ancient Human Ancestor
		For example, attempts to recreate the common ancestor to most placental mammals would likely involve replacing the DNA of a mouse's immature egg cell with the recreated DNA.
		Scientists recreated part of the genome of a later species, known simply as the "boreoeutherian ancestor," which is thought to be the most recent common ancestor of all placental mammals.
		The results allowed the scientists to reconstruct a DNA sequence common to each species, including their common ancestor, thought to be the mother of most placental mammals.
	news.nationalgeographic.com /news/2005/01/0125_050125_genome.html (969 words)

	Lalibela
		But the handmaid of the Queen, too, gave birth to a son whose father was King Solomon, and her son was the ancestor of the Zagwe dynasty.
		The large opening in the eastern wall provides light for the cell and has the shape of a harmonious croix pattee with flat-pitched finials.
		Yet there are two harmoniously designed window openings in the southern wall which give light to two shrines, the one on the left to the "lyasus-Cell" (Cell of Jesus) of Bet GoIgota; the right-hand one to the Selassie Chapel.
	www.selamta.net /lalibela.htm (4460 words)

	"24" Phones Home - Nov 10, 2004 - E! Online News
		Obviously, with so much action packed into about 60 seconds of video, 24 the cell phone series will proceed at the same frenetic pace as its tube ancestor.
		As for when the action will hit a cell phone near you, it depends on which side of the ocean you'll be viewing your weekly dose of supercharged celludrama.
		Drama, as in your favorite Fox action series, 24, which is about to become the first TV show to be spun off into its own cell phone series.
	www.eonline.com /News/Items/0,1,15315,00.html (709 words)

	PAG-IX: GENOMIC STRUCTURE OF THE LOCUS AROUND JOINING SEGMENTS OF PORCINE T CELL RECEPTOR ALPHA AND ITS COMPARATIVE ANALYSIS AGAINST THE LOCI OF HUMANS AND MICE
		This implies that the clustering structure of J alpha was constructed at the stage of their common ancestor.
		Four TCR J alpha segments are identified in the upstream region of TCR C delta.
		T cell receptor (TCR) delta gene is located between the region encoding variable and constant region of TCR alpha chain.
	www.intl-pag.org /9/abstracts/P01_28.html (350 words)

	Last universal ancestor - Wikipedia, the free encyclopedia
		The last universal ancestor already had all of the properties that are shared by all currently living organisms, such as a (prokaryotic) cell structure, DNA, the modern genetic code and mRNA, tRNA and ribosome mediated transcription.
		Last universal ancestor (LUA), the hypothetical latest living organism from which all currently living organisms descend.
		Also LCA (last common ancestor) or LUCA (last universal common ancestor).
	en.wikipedia.org /wiki/Last_universal_ancestor (350 words)

	Maternal Lines
		Today many clans are bilateral, consisting of all the descendents of the apical ancestor through both the male and female lines.
		Everyone in the same clan is a direct maternal descendant of one of these clan mothers and carries her DNA within every cell of their body.
		Each of these groups, by an astounding yet inescapable logic, traced back to just one woman, the common maternal ancestor of everyone in her group, or clan.
	www.genforum.familytreemaker.com /rutherford/messages/5889.html (799 words)

	Last universal ancestor - Wikipedia, the free encyclopedia
		It is hypothesized that the last universal ancestor already had all of the properties that are shared by all currently living organisms, such as a (prokaryotic) cell structure, DNA
		Last universal ancestor (LUA), the hypothetical latest living organism from which all currently living organisms descend.
		As such, it is the most recent common ancestor of the set of all currently living organisms.
	en.wikipedia.org /?title=LUCA (304 words)

	WarmUp 11 responses
		So, at the minimum, the "Last Common Universal Ancestor" would be cells that had all of these characteristics but had not yet changed enough from each other to differentiate into Domains.
		From ND: Q3 = The "Common Universal Ancestor" would of had to been a small form of bacteria that developed into a single cell organism thatwould of been able to survive in extremely cold temperatures.
		From Dr. Marrs: a "Last Common Universal Ancestor" of all life would have had properties that are now to common to all life, ie: the very simplest forms of life.
	webphysics.iupui.edu /webscience/bio_archive/warmup11resp.html (1015 words)

	"My Name is LUCA -- The Last Universal Common Ancestor" by Anthony M. Poole, Ph.D.
		LUCA is short for Last Universal Common Ancestor, and it is from this 'organism' that every living cell on the planet has descended.
		Universal protein families and the functional content of the last universal common ancestor.
		Nevertheless, universal features are important because they describe a 'lower limit' from which to build upon, and importantly, all these attempts converge on agreement insofar as concluding that LUCA was quite complex.
	www.actionbioscience.org /newfrontiers/poolepaper.html (7113 words)

	Cafe Arcane - Scientists zero in on suspected common ancestor of all living things -- A cozy, caffeinated corner of the web that serves as my personal website and blog.
		The quest for a universal common ancestor is made possible by the fact that all organisms from LUCA on down share a few hundred or thousand basic genes that enable them to eat, grow and reproduce.
		They call it LUCA - shorthand for the "last universal common ancestor" - and they think it inhabited the Earth 3 billion to 4 billion years ago.
		"Rather than a single last common ancestor as implied by the concept of LUCA, there were probably populations of organisms that readily exchanged or assimilated genetic information from neighboring genomes.
	www.arcane.org /modules.php?name=News&file=article&sid=774 (725 words)

	Root development
		Q: Which cell in the plant is the common ancestor of the pericycle initial and the CE-initial?
		However, given that the pericycle is derived from the embryonic procambium (L3) and the cortex is derived from the embryonic ground meristem (L2), a more precise answer would be: A cell in the lower tier of the early globular-stage embryo (Fig.
		There are eight CE-initials, which give rise to eight cortical cell files and eight endodermal cell files.
	www.bio.utk.edu /vonarnim/BOT404/BOT404Day8.html (1619 words)

	Neural network approach to phylogenetic reconstruction.
		Two different neighborhoods are used: if the sister cell has no descendants (both sister cells are at the only descendants of the node), the neighborhood includes the winning cell, the ancestor node and the other sister cell, otherwise it includes only the winning cell itself (see Figure 1C).
		If the change exerted by the input sequences over the winning cells and their neighborhood is too strong, the network could become unstable and convergence might not be reached.
		In the event of D cell being the winning cell, the neighborhood extends to itself and their mother and sister cells B and E, respectively.
	bioinfo.cnio.es /docus/papers/jme (1619 words)

	vlmn110.txt
		To give a few examples, we can infer from the fact that the human ovum is a simple cell that the first ancestor of our species was a tiny unicellular being, something like the amoeba.
		The typical embryonic form of the metazoa, as it is presented for a time by this simple structure of the two-layered body, is called the gastrula; it is to be conceived as the hereditary reproduction of some primitive common ancestor of the metazoa, which we call the gastraea.
		In the same way, we know, from the fact that the human foetus consists, at the first, of two simple cell-layers (the gastrula), that the gastraea, a form with two such layers, was certainly in the line of our ancestry.
	www2.cddc.vt.edu /gutenberg/etext04/vlmn110.txt (18232 words)

	Integrative and Comparative Biology: origin of metazoan complexity: Porifera as integrated animals1, The
		Sponges [Porifera] are the phylogenetically oldest metazoan phylum still extant today; they share the closest relationship with the hypothetical common metazoan ancestor, the Urmetazoa.
		This new step in understanding of the basal animal phylogeny is the platform for answering the next pressing question of the origin of individuation in Metazoa, again regarding Porifera as living fossils, descendants of a colonial ancestor.
		During the past 8 years cDNAs coding for proteins involved in cell-cell- and cell-tissue interaction have been cloned from sponges, primarily from Suberites domuncula and Geodia cydonium and their functions have been studied in vivo as well as in vitro.
	www.findarticles.com /p/articles/mi_qa4054/is_200302/ai_n9184744 (1419 words)

	Gastropod Evolution
		In Figure 1, the major gastropod groups are arranged according to the cell stage at which the 3D forms the mesentoblast (4d) cell.
		It appears that the radiation of gastropods from an archaeogastropod-like ancestor to each of the more derived clades has been associated with the early specification of the mesentoblast.
		Moreover, in the more derived gastropods, 3D divides at the 24-cell stage, whereas 3A, 3B, and 3C divide only at the 41-cell stage.
	zygote.swarthmore.edu /evo2.html (513 words)

	Ancient Baird History
		1228: Richard de Baird makes a donation to the Abbot and Convent of Kelso, dated at Lismahago, (a cell belonging to that abbacy) and the signing witnesses are William de Maitland, ancestor of the Earl of Lauderdale, Archibald Lord Douglas, William Fleming, ancestor to the Earl of Wigton, Malcom Lockhart, andc Chartulary of Kelso, p.
		1364: Or about that time Sir Lawrence Baird, of Posso, in the county of Peebles, married the second daughter of Sir Thomas Somerville, Lord Somerville's ancestor, by Lady Elizabeth Douglas, daughter to Sir James Douglas, ancestor to the Earl of Morton.
		On March 28, King Edward III, then at Pomfret Castle, being informed that the above two gentlemen were taken prisoners, and in the custody of Ranulph de Dacre, Governor of Carlisle Castle, sends his mandate of this date, to the said Governor commanding them to be kept securely till further orders.
	advweb.lsn.net /~vandoren/ancientbaird.html (513 words)

	TalkOrigins Archive - Feedback for February 2000
		The last common ancestor of plants and animals may not have been a many-celled organism, but a single celled organism.
		Also, there is an enormous gap between amino acids and a one celled organism.
		Plants have rigid cell walls, while animals have cell membranes which are more flexible, and plants include a cellular organelle (component) called a "chloroplast", itself the fusion of a eukaryote cell with another older form of cell known as a blue-green algae.
	www.talkorigins.org /origins/feedback/feb00.html (513 words)

	Invasion of the Coastal Environment & Origin of Multicellurity
		Since all of the photosynthetic Stramenopiles form a single lineage recently referred to as the Ochrophytes (Cavalier-Smith and Chao, 1996), the secondary acquisition of chloroplasts only had to take place once in a common ancestor of this lineage.
		The acquisition of chloroplasts with chlorophyll a and c and fucoxanthins could have taken place once in the common ancestor of the Ochrophytes (1), or in the common ancestors of a larger clade that includes two phytoplankton stem groups and the Alveolates (2).
		Their chloroplast pigments are identical to those of the Plant Clade, so a unicellular green algal cell is the likely source of their chloroplasts, a conclusion confirmed by a molecular phylogenetic study of chloroplasts (Fig.3-6).
	www.bio.ilstu.edu /armstrong/syllabi/222book/chapt4.htm (17259 words)

	Evolution of Metazoa
		Would require loss of cell wall, photosynthetic mechanisms in Metazoa, although an origin from a unicellular autotroph without a cell wall is a possibility.
		Most scientists agree that a Protist-like organism was the common ancestor of all Metazoa.
		However, the Metazoa (multicellular animals) are probably monophyletic.
	www.bios.niu.edu /Parrish/401.htm (793 words)

	Cell-Specific Expression of Homospermidine Synthase, the Entry Enzyme of the Pyrrolizidine Alkaloid Pathway in Senecio vernalis, in Comparison with Its Ancestor, Deoxyhypusine Synthase -- Moll et al. 130 (1): 47 -- PLANT PHYSIOLOGY
		Cell-Specific Expression of Homospermidine Synthase, the Entry Enzyme of the Pyrrolizidine Alkaloid Pathway in Senecio vernalis, in Comparison with Its Ancestor, Deoxyhypusine Synthase -- Moll et al.
		Cell-Specific Expression of Homospermidine Synthase, the Entry Enzyme of the Pyrrolizidine Alkaloid Pathway in Senecio vernalis, in Comparison with Its Ancestor, Deoxyhypusine Synthase
		Ober D, Hartmann T (1999b) Homospermidine synthase, the first pathway-specific enzyme of pyrrolizidine alkaloid biosynthesis, evolved from deoxyhypusine synthase.
	www.plantphysiol.org /cgi/content/full/130/1/47 (5427 words)

	Mariazeller Bahn - Wikipedia, the free encyclopedia
		The Maria cell hereditary ancestor is part of the traffic group Lower Austria castle country.
		Barrier driver special train with Kirchberg at the PielachDie Maria cell hereditary ancestor is the only electrically operated narrow-gauge railway of the Austrian federal courses and historically conditionally with single-face alternating voltage of 6,6 kV and a frequency of 25 cycles per second is operated.
		The Mariazeller Bahn (Railway of Mariazell) is an electrical narrow-gauge railway in Austria with a track width of 760 millimeters, which drives between St. Pölten and Mariazell.
	www.wikipedia.org /wiki/Mariazeller_Bahn (5427 words)

	Encyclopedia: Mariazeller Bahn
		Barrier driver special train with Kirchberg at the PielachDie Maria cell hereditary ancestor is the only electrically operated narrow-gauge railway of the Austrian federal courses and historically conditionally with single-face alternating voltage of 6,6 kV and a frequency of 25 cycles per second is operated.
		The Maria cell hereditary ancestor is part of the traffic group Lower Austria castle country.
		The Mariazeller Bahn (Railway of Mariazell) is an electrical narrow-gauge railway in Austria with a track width of 760 millimeters, which drives between St. PÃ¶lten and Mariazell.
	www.nationmaster.com /encyclopedia/Mariazeller-Bahn (5427 words)

	Faction Paradox: The Website - Faction Paradox Reading List
		The Faction Paradox novels/comics as published by Mad Norwegian Press formally ignore that The Ancestor Cell ever happened.
		THE ANCESTOR CELL (by Peter Anghelides and Stephen Cole, July 2000) -- The book that exorcises all Faction Paradox elements from the BBC Books' science fiction novels.
		THE SHADOWS OF AVALON (by Paul Cornell, BBC Books, Feb. 2000) -- Laura Tobin (nicknamed "Compassion") undergoes transformation into an indestructable timeship, capable of traveling throughout time and space.
	www.madnorwegian.com /fp/fp_readinglist.php (515 words)

	Plagiarized Errors and Molecular Genetics
		The crucial observation relating the discovery of pseudogenes and retroposons to the theory of evolution is this: some pseudogenes and retroposons are shared between different species, as though they were copied from a pseudogene or retroposon in a common ancestor.
		As is the case for most mutations, the overwhelming majority of retroposon insertions occur in the non-functional DNA between genes, and have no effect on the cell or organism; and it is this vast set of insertions, shared between species, that provide the basis for the present argument supporting evolution.
		Once a DNA copy of an RNA has been synthesized by RT, this DNA may be inserted into breaks in DNA that occur from time to time in the cell and that are normally sealed by a complex machinery of DNA repair enzymes required by all cells.
	www.talkorigins.org /faqs/molgen (16141 words)

	What is a second cousin thrice removed?
		The cell where the corresponding column and row intersect describes the relationship of person A with respect to person B. For example (see below), suppose Mary and John have a common ancestor, Frank.
		For the second person (B) locate their relationship to the common ancestor on the first column.
		For the first person (call them A) locate their relationship to the common ancestor on the first row.
	billyard.servehttp.com /~jaf/relations.html (16141 words)

	Trochoblast Differentiation
		The cleavage patterns of their respective embryos are similar, and the same cell lineages have the same fates in their respective trochophore larvae.
		The molluscs and the annelids are thought to be "sister-phyla," derived from a common ancestor.
		After the seventh cleavage, the secondary trochoblast cells, which are derived from two other cell lineages, also leave the cell cycle and begin to form cilia (Damen et al., 1994).
	zygote.swarthmore.edu /cyto2.html (1366 words)

Try your search on: Qwika (all wikis)

Topic: The Ancestor Cell

Ads by Google

Related Topics

In the News (Fri 25 Dec 09)