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Topic: Unicellular


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  BioMed Central | Full text | RNA:protein ratio of the unicellular organism as a characteristic of phosphorous and ...
RNA:protein ratio of the unicellular organism as a characteristic of phosphorous and nitrogen stoichiometry and of the cellular requirement of ribosomes for protein synthesis
According to the GRH, the main reasons for the positive correlation between P:N stoichiometry of organisms and their growth rate lie in changes in the allocation of cellular resources to the synthesis of ribosomes and ribosomal RNA [6,7].
In support of this mechanism, the P:N ratios calculated from RNA and protein contents in the studied unicellular organisms growing in very diverse conditions were in the same range as the mean ratios reported for different microorganisms, and were similarly related to growth rate as stated in the GRH.
www.biomedcentral.com /1741-7007/4/30   (5689 words)

  
  Microorganism - Wikipedia, the free encyclopedia
Microorganisms are often illustrated using single-celled, or unicellular organisms; however, some unicellular protists are visible to the naked eye, and some multicellular species are microscopic.
Unicellular species are those whose members consist of a single cell throughout their life cycle.
Usually, unicellular organisms contain only a single copy of their genome (except when undergoing cell division), although some organisms have multiple cell nuclei (see coenocyte).
en.wikipedia.org /wiki/Unicellular_organism   (157 words)

  
 Re: advantages and disadvantages of the multicellular state
Unicellular algae are adapted to living in shallow waters and along the shores.
Multicellular algaea live in a very different environment compared to the unicellular algae.The multicellular algae are found in shallow waters and along the shores.
The unicellular organism, who lives in a fairly calm and less harsh environment does not have to work hard for nutrients.
www.madsci.org /posts/archives/2000-12/976932252.Gb.r.html   (432 words)

  
 unicellular organism - Hutchinson encyclopedia article about unicellular organism
Most are invisible without a microscope but a few, such as the giant amoeba, may be visible to the naked eye.
The main groups of unicellular organisms are bacteria, protozoa, unicellular algae, and unicellular fungi or yeasts.
This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
encyclopedia.farlex.com /Unicellular+organism   (106 words)

  
 Search Results for unicellular - Encyclopædia Britannica
A thallus is composed of filaments or plates of cells and ranges in size from a unicellular...
Unicellular organisms that ingest food particles via vacuoles rely on intracellular digestion to prepare the nutrients for use.
Amoeboid movement occurs as an extension of the cytoplasm, called a pseudopod (“false foot”), flows outward, deforms the cell boundary, and is followed by the rest of the cell.
www.britannica.com /search?query=unicellular&submit=Find&source=MWTEXT   (360 words)

  
 Mono-cell Organisms
Although both multicellular and unicellular organisms perform the same basic functions of life, since unicellular organisms do not possess organs; it requires different methods to absorb nutrition, to excrete waste, to grow, and to reproduce.
Some advanced eukaryotic unicellular organisms such as the algae has evolved to exhibit life cycles with diplontic period - that means they have sophisticated sex (exchange of genetic materials) to fertilize a zygote.
Ultimately, the reproduction and growth of unicellular organisms take the cues from nutrient supplies and condition of the environment, while the multicellular organisms run their internal program for such functions - external cues play only a secondary role.
universe-review.ca /F11-monocell.htm   (15354 words)

  
 Unicellular organisms contribute more nitrogen to ocean than reported earlier   (Site not responding. Last check: 2007-10-06)
In this map of the Pacific Ocean, the deep blue areas are the nutrient-poor and thus low-fertility, central gyres of the major ocean basins.
On a transect from Oahu, Hawaii, to San Diego, Calif., researchers measured some of the highest rates in this study: Seven milligrams of nitrogen – an essential nutrient for the growth of many organisms –; were being injected into the phytoplankton and other organic materials in every square meter of the ocean surface.
“To our surprise, these unicellular nitrogen-fixers are broadly distributed spatially and vertically distributed at least down to 100 meters, and they’re fixing nitrogen at quite high rates,” said lead author Joe Montoya, an associate professor of biology at the Georgia Institute of Technology.
gtresearchnews.gatech.edu /newsrelease/nitrogen.htm   (1078 words)

  
 Algal growth Forms
Unicellular algae are often members of the phytoplankton, floating freely in oceans, lakes, and streams.
Many unicellular algae have flagellae, enabling them to move (albeit slowly) through the water column.
Some members are unicellular throughout their life, while at the other extreme some Chlorophyta grow to be 8 meters long.
userwww.sfsu.edu /~biol240/labs/lab_09algae/pages/algalforms.html   (692 words)

  
 United States Patent: 4,237,224   (Site not responding. Last check: 2007-10-06)
A method for producing a protein foreign to a unicellular organism by means of expression of a gene by said unicellular organism, wherein said gene is derived from a source which does not exchange genetic information with said organism, said method comprising:
That is, those unicellular organisms which are capable of being grown in cultures of fermentation.
Thus, the subject invention provides new plasmids which cannot naturally occur and can be used for transformation of unicellular organisms to introduce genes from other unicellular organisms, where the replicon and gene could not previously naturally coexist in a plasmid.
cseserv.engr.scu.edu /NQuinn/ENGR019_301Winter2002/UnitedStatesPatent4237224.html   (8421 words)

  
 Unicellular organisms contribute more nitrogen to ocean that reported earlier
Unicellular organisms contribute more nitrogen to ocean that reported earlier
Large, nutrient-poor expanses of the open ocean are getting a substantial nitrogen influx from an abundant group of unicellular organisms that "fix," or chemically alter, nitrogen into a form usable for biological productivity.
First identified about five years ago, these organisms — about 7 microns in diameter — are fixing nitrogen at rates up to three times higher than previously reported for the Pacific Ocean, according to research published in the Aug. 26, 2004 edition of the journal Nature.
www.eurekalert.org /pub_releases/2004-08/giot-uoc082304.php   (1126 words)

  
 N2 Fixation by Unicellular Bacterioplankton from the Atlantic and Pacific Oceans: Phylogeny and In Situ Rates -- ...
Diversity of diazotrophic unicellular cyanobacteria in the tropical North Atlantic Ocean.
Growth of synchrony and cellular parameters of the unicellular nitrogen-fixing marine cyanobacterium, Synechococcus sp.
Unicellular, aerobic nitrogen-fixing cyanobacteria of the genus Cyanothece.
aem.asm.org /cgi/content/full/70/2/765   (3226 words)

  
 The Biological Bulletin: Orientation of motile unicellular algae to oxygen: oxytaxis in Euglena.@ HighBeam Research   (Site not responding. Last check: 2007-10-06)
Orientation of motile unicellular algae to oxygen: oxytaxis in Euglena.
The unicellular algae Euglena gracilis' orientation to oxygen is examined using an airtight stainless steel cuvette capable of producing and maintaining an oxygen gradient.
Further experiments reveal that unicellular algae responds to oxygen in the dark when the photosynthetic apparatus is passive and oxygen production of chloroplasts is absent.
www.highbeam.com /library/doc0.asp?DOCID=1G1:20355349&refid=holomed_1   (214 words)

  
 BioEd Online Slides: Monera, decomposers, unicellular, protist, mutualism: Biology Lesson Plan
Organisms are divided into each of five kingdoms based on defining characteristics, such as: cell type; cell structures; whether the organism is unicellular, multicellular, or has both forms; and nutrition.
Bacteria are unicellular organisms that do not contain a nucleus or internal compartments, and their genome does not contain introns.
Members of the microbial kingdom Protista originally were defined by structure (mainly unicellular eukaryotes) and by the difficulty to classify them as either plant, fungi or animal.
www.bioedonline.org /slides/slide01.cfm?tk=2   (1752 words)

  
 Kingdom Protista
The Cholorobionts are the green algae, including unicellular, colonial, and multicellular types; these are believed to have been the ancestors of modern plants.
The Dinozoa comprise the dinoflagellates, unicellular algae that move with two oppositely situated flagella to produce the whirling motion they are known for.
Arasiomycota are the cellular slime molds, with a predominantly amoeboid unicellular stage, while Myxomycota are the plasmodial slime molds, with a unicellular stage, the plasmodium, of vast, streaming cytoplasm with many nuclei.
www.sidwell.edu /us/science/vlb5/Labs/Classification_Lab/Eukarya/Protista   (999 words)

  
 Hemoglobin switching in unicellular erythroid culture of sibling erythroid burst-forming units: kit ligand induces a ...
Hemoglobin switching in unicellular erythroid culture of sibling erythroid burst-forming units: kit ligand induces a dose-dependent fetal hemoglobin reactivation potentiated by sodium butyrate -- Gabbianelli et al.
Hemoglobin switching in unicellular erythroid culture of sibling erythroid burst-forming units: kit ligand induces a dose-dependent fetal hemoglobin reactivation potentiated by sodium butyrate
The 4 sibling BFU-Es were subdivided and individually reseeded in unicellular erythroid culture: 3 siblings were treated with graded amounts of IL-3, GM-CSF, or KL ± HD inhibitor (NaB or TSA); the fourth control sibling was untreated.
www.bloodjournal.org /cgi/content/full/95/11/3555   (4428 words)

  
 The Barcode of Life blog » Blog Archive » Exploring unicellular eukaryotic universe with mtDNA
 Unicellular eukaryotes or “protists”; probably comprise most of Earth’s biomass and encompass more genetic diversity than all multicellular animals and plants combined.  In current J Eukaryot Microbiol 2006 53:385 Denis Lynn and Michaela Struder-Kypke report on mitochondrial cytochrome oxidase I sequences in Tetrahymena, a ciliate protozoan genus related to Paramecium which includes T.
This early study suggests further exploration of unicellular eukaryotic biodiversity with COI barcodes will be fruitful. 
This entry was posted on Thursday, September 14th, 2006 at 11:02 am and is filed under General.
phe.rockefeller.edu /barcode/blog/2006/09/14/exploring-unicellular-eukaryotic-universe-with-mtdna   (528 words)

  
 MSN Encarta - Search Results - unicellular
That oxygen abundance or lack determines the character of growth masses of plant tissue in a culture medium, has been shown by Dr. Philip White, of the Rockefeller Institute for Medical Research at Princeton, N. He found that if these tissues received a sufficient supply of oxygen they would...
Parasite : parasitic invertebrates : unicellular parasites: Flagellates
Flagellates, common name for a diverse group of unicellular organisms in the subphylum Mastigophora, kingdom Protista, that have in common whiplike...
encarta.msn.com /unicellular.html   (124 words)

  
 Amazon.com: unicellular   (Site not responding. Last check: 2007-10-06)
Life and death, heredity and evolution in unicellular organisms, (Lectures delivered under the Richard B. Westbrook Free Lectureship Foundation at the Wagner Free Institute of Science, Philadelphia) by H. S Jennings (Unknown Binding - 1920)
Physiology and carbon metabolism of the unicellular red alga Rhodella reticulata related to exopolysaccharide synthesis by William Karl Kroen (Unknown Binding - 1989)
Effect of unicellular algal lipids on oyster lipids and their fatty acid compositions (Technical report - Fisheries Research Board of Canada) by Takeshi Watanabe (Unknown Binding - 1972)
www.amazon.com /s?ie=UTF8&keywords=unicellular&index=blended&page=1   (411 words)

  
 Ferredoxin from Aphanothece halophitica, a unicellular blue-green alga: close relationship to ferredoxins from ...
Ferredoxin from Aphanothece halophitica, a unicellular blue-green alga: close relationship to ferredoxins from filamentous blue-green algae and phylogenetic implications -- Hase et al.
Ferredoxin from Aphanothece halophitica, a unicellular blue-green alga: close relationship to ferredoxins from filamentous blue-green algae and phylogenetic implications
The amino acid sequence of a ferredoxin from a unicellular blue-green alga,
jb.oxfordjournals.org /cgi/content/abstract/94/5/1457   (219 words)

  
 Programmed cell death in the unicellular protozoan parasite Leishmania   (Site not responding. Last check: 2007-10-06)
The induction of PCD initiated in unicellular organisms such as Trypanosomatids, Tetrahymena, Dictyostelium by external signals or in bacteria and yeast by expression of proapoptotic proteins leads us to believe that the PCD pathway is present in unicellular as well as in multicellular organisms.
Some of the differences may arise because the PCD in unicellular organisms is not adapted to lead to phagocytosis of the dead cells as in multicellular organisms.
One of the proposed functions of the PCD pathway in unicellular organisms is to control the cell population, as is the case in multicellular organisms.
www.nature.com /cdd/journal/v9/n1/full/4400952a.html   (6680 words)

  
 Unicellular - EvoWiki   (Site not responding. Last check: 2007-10-06)
Unicellular refers to organisms consisting of only one cell.
Historically, unicellular organisms were grouped in two taxa within the kingdoms of plants and animals, depending on whether they are capable of photosynthesis.
For example, the taxon Flagellata was split in Zooflagellata (flagellate animals) and Phytoflagellata (flagellate plants), dispersing even very close relatives into different kingdoms.
wiki.cotch.net /index.php/Unicellular   (135 words)

  
 Definition of unicellular - Merriam-Webster Online Dictionary
Learn more about "unicellular" and related topics at Britannica.com
Find more about "unicellular" instantly with Live Search
See a map of "unicellular" in the Visual Thesaurus
www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=unicellular   (36 words)

  
 PCR Analysis of the Distribution of Unicellular Cyanobacterial Diazotrophs in the Arabian Sea -- Mazard et al. 70 (12): ...
PCR Analysis of the Distribution of Unicellular Cyanobacterial Diazotrophs in the Arabian Sea -- Mazard et al.
PCR Analysis of the Distribution of Unicellular Cyanobacterial Diazotrophs in the Arabian Sea
Temporal separation of photosynthesis and dinitrogen fixation in the marine unicellular cyanobacterium Erythrosphaera marina.
aem.asm.org /cgi/content/full/70/12/7355   (3920 words)

  
 Unicellular Organisms
Most of us don't think about these unicellular creatures very much, but they are all around us.
The main groups of unicellular organisms are bacteria, protozoa, unicellular algae, and unicellular fungi or yeasts.
Each species is unique, and they are interesting to study because of their complex and beautiful patterns.
www.edhelper.com /ReadingComprehension_37_180.html   (205 words)

  
 Unicellular-Unilineage Erythropoietic Cultures: Molecular Analysis of Regulatory Gene Expression at Sibling Cell Level ...
Evaluation of apoptosis in unicellular, unilineage erythroid cultures.
In the described unicellular, unilineage culture system (Fig 1), apoptosis of individual cells may occur.
Figure 1 outlines processing of single cells grown in the unilineage, unicellular culture system.
www.bloodjournal.org /cgi/content/full/93/10/3355   (7408 words)

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