How To Use Unicellular In A Sentence
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All further cell divisions from this unicellular stage of the human being occur by simple mitosis.
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Glandular trichomes can be found as unicellular, multicellular, and stalked structures.
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Guts: Many unicellular eukaryotes were multifunctional cells, doing many different things, however these became specialized in multicellular organisms.
Biomolecular Networks
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In the heliocentric perspective, our dear earth is a mere speck in this expanding infinite space where a very tenacious life came into existence in its oceans about two and half billion years ago in a unicellular body - the Amoeba.
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The still wider evolution, not of solitary individuals, but of all the individuals within each province -- in the vegetal world from the unicellular cryptogam to the highest phanerogam, in the animal world from the amorphous amœba to Man -- is at least suspected, the gradual rise of types being at all events a fact.
Natural Law in the Spiritual World
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Have RAs or related molecules been discovered in unicellular organisms?
Ancient signalling machinery
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When studying the chromosomes of Tetrahymena, a unicellular ciliate organism, she identified a DNA sequence that was repeated several times at the ends of the chromosomes.
The 2009 Nobel Prize in Physiology or Medicine - Press Release
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The species are dimorphic, living as hyphal saprobes in the desert soil or as unicellular pathogens that convert into multicellular sporulating spherules in the mammalian host.
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The results support a hypothesis of multiple gains and/or losses of nitrogen-fixation abilities among the sheathless, unicellular cyanobacteria.
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As regards the former, leucocytes are guided chiefly by chemiotaxis, _i. e._ by sensitiveness to chemical substances in their surroundings -- a property which is not peculiar to them but is possessed by various unicellular organisms, including motile bacteria.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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In genes of cold-blooded animals, plants, and unicellular organisms, these regularities are weaker and often not consistent.
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It is very similar in form in that the labellar trichomes are unicellular and clavate with ‘stalks’ of varying lengths.
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Ciliates include some of the largest free-living unicellular organisms.
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Current molecular and morphological data support the hypothesis that eukaryotic diversity comprises five major supergroups: UNIKONTS, which include animals, the unicellular choanoflagellates, to which they are closely related, as well as fungi (mushrooms!) and a whole host of things called amoebae!
Boing Boing
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In particular, both corals and giant clams harbour unicellular algae which live within their body cells.
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The unicellular biflagellate green alga Chlamydomonas reinhardtii can perceive light and respond by altering its swimming behavior.
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Eukaryote --- A unicellular or multicellular organism in which the cells have a nucleus with a nuclear membrane and other specialized characteristics. See also prokaryote.
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Saranak J, Patel N, Zarilli G, Okabe M, et al. (1984) A rhodopsin is the functional photoreceptor for phototaxis in the unicellular eukaryote
PLoS ONE Alerts: New Articles
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For example, the unicellular progenitors of plants underwent an important evolutionary step following the establishment of a second endosymbiotic relationship, resulting in the evolution of the plastid.
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In a pioneering experiment, they demonstrated that telomere DNA from one organism, a unicellular ciliated protozoan called Tetrahymena thermophila, would protect and stabilise chromosomes in an entirely different organism, yeast.
The 2009 Nobel Prize in Physiology or Medicine - Presentation Speech
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We have already seen that the young egg-cell multiplies itself by simple binary division, after the manner of unicellular organisms in general -- thereby indicating, as also by its amoebiform movements, its fundamental identity with such organisms in kind.
Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
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Summer often brings a green coloration caused by dense growths of unicellular green algae stimulated by excess light.
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As one who believes that mutations in unicellular organisms are not random this proposal is particularly intriguing.
A Genomic Balancing Act
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These unicellular photoreceptors contain both the putative photosensory microvilli and the shielding pigment granules within the same cell, which also carries a motor cilium that enables the larva to show phototactic behavior.
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Have RAs or related molecules been discovered in unicellular organisms?
Ancient signalling machinery
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Clusters of tightly packed, short to long, unicellular, claviform, yellowish trichomes were observed on the lip surface.
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Mostly unicellular phytoplankton---dinoflagellates were most prevalent, but a lot of them I didn't recognize.
MINUTES TO BURN
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The stigma consists of a long band of receptive tissue along the ventral side of the carpel, covered by long unicellular papillae.
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The unicellular algae, known as zooxanthellae, or zoox, need to photosynthesise to survive.
Times, Sunday Times
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Since such a creature as the rabbit is formed through the co-operation of a vast multitude of cells, it is called multicellular; the amoeba, on the other hand, is unicellular.
Text Book of Biology, Part 1: Vertebrata
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For example purposeful behavior surely occurred in unicellular eukaryotic ancestors of modern organisms like paramecia and euglena who perform rather complex adaptive movements.
Coordinated Evolution
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Cytosine deamination, controlled variation and the immunological functions are nicely linked and analogous systems in unicellular organisms can be found.
Controlled Pathways
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However, the evolutionary distance between unicellular organisms and higher plants might be a serious setback when trying to obtain high expression, at the right time and cellular localization, of foreign genes in plants.
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Flagellar length in the unicellular, biflagellate, green alga Chlamydomonas reinhardtii is tightly regulated.
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There are more than a thousand described species of golden algae, most of them free-swimming and unicellular, but there are filamentous and colonial forms.
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As compared to metazoans, the development of these unicellular organisms is likely less affected by dissociated heterochrony, which is considered a common phenomenon in metazoans.
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Most unicellular flagellate algae are phototactic, i.e., capable of orientation with respect to the direction of light.
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Our results also indicate how recently evolved multicellular organisms adapted the phototactic capabilities of their unicellular ancestors to multicellular life.
BioMed Central - Latest articles
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These micro-organisms are found in just a few pieces of amber among the thousands that have been studied, but show a remarkable diversity: unicellular algae, mainly diatoms found in large numbers, traces of animal plankton, such as radiolaria and a foraminifer, spiny skeletons of sponges and of echinoderms.
Signs of the Times
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Lastly, with respect to karyokinesis, although it is true that the microscope has in comparatively recent years displayed this apparently important distinction between unicellular and multicellular organisms, two considerations have here to be supplied.
Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
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The evolution of multicellular animals from unicellular protists is one of the key transitions of life on Earth.
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Of voluntary capacities and powers the newborn infant possesses little more than the simplest unicellular animalcule, that is, about all it can do is to scent and swallow food.
Nature Cure
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As evolutionary theory became more widely accepted, natural scientists speculated that the cells of complex organisms might be the descendants of unicellular ancestors, retaining considerable autonomy.
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The greenstones of the Kaapvaal craton in the northeast have been found to contain unicellular and biogenic filamentous structures, signs of some of the earliest forms of life.
Nama Karoo
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Life was prokaryotic and unicellular for 3 billion years.
Ancient Predator Revealed!
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The dinosaurs were only one of the groups that became extinct at the end of the Cretaceous; also hard-hit were the unicellular Foraminifera, the ammonites, and marine reptiles such as the mosasaurs and plesiosaurs.
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Finally, all representatives of section Polystachya examined were found to possess multicellular, uniseriate, moniliform trichomes that fragment to form unicellular units.
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Although the evolution of well-mixed, unicellular microorganisms has been studied extensively, the evolution of filamentous microorganisms has not.
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All cyanobacteria are unicellular, though many grow in colonies or filaments, often surrounded by a gelatinous or mucilaginous sheath.
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An interesting variant of normal photosynthesis is the simultaneous photoevolution of molecular hydrogen and oxygen by certain unicellular algae and in vitro cell-free preparations.
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All this, it will be noticed, is a case of cell-multiplication, which differs from that which takes place in the unicellular organisms only in its being _invariably_ preceded (as far as we know) by karyokinesis, and in the resulting cells being all confined within a common envelope, and so in not being free to separate.
Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
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A prediction of front-loading is genes required for multicellularity being discovered in unicellular organisms, and I have previously suggested looking at amoebae, one of the oldest eukaryotes.
2007 January - Telic Thoughts
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Overall, the characteristics of the fast diatom currents most closely resemble those of vertebrate and invertebrate muscle Na This is the first demonstration of voltage-activated Na+ channels and the capacity to generate fast Na+-based action potentials in a unicellular photosynthetic organism.
PLoS ONE Alerts: New Articles
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Many unicellular eukaryotes were multifunctional cells, doing many different things, but specialized in multicellular organisms.
Biomolecular Networks
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An astonishing diversity of unicellular microfossils has been discovered in 800-million-year-old rocks from Victoria Island.
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For example, from the fact that the human egg is a simple cell, we may at once infer that there has been at a very remote time a unicellular ancestor of the human race resembling an Amoeba.
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Other unicellular organisms found include bacteria, cyanobacteria, dinoflagellates, and other protists.
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Entamoeba are unicellular eukaryotes that frequently parasitize vertebrate species including human.
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Symbiosis with unicellular phototrophs has existed in anthozoans at least since the Triassic (225 million years ago) and likely constitutes a source of selective pressures that have deeply modified the host's physiology.
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Gas vesicles are gas-filled intracellular structures that provide buoyancy in many unicellular aquatic organisms.
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For example purposeful behavior surely occurred in unicellular eukaryotic ancestors of modern organisms like paramecia and euglena who perform rather complex adaptive movements.
Coordinated Evolution
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If we can't find RAs or related molecules (that they could have evolved from) in unicellular organisms, then it would seem to point to at least a second design event, wouldn't it?
Ancient signalling machinery
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However, the potential of the unicellular green alga chlamydomonas in selection systems has been studied most.
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So Mike has been cataloging a number of components that have one use in unicellular life, and a different use in multicellular life, to show that front loaded designs wouldn't necessarily be lost in the future.
A Tetrahymena Puzzle
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Second, the existence of unicellular life for one or two billion years without the formation of multicellular life wouldn't be a problem on Mars because it obviously was not a problem on Earth.
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Every animal that has only one cell-nucleus, every amoeba, every gregarina, every infusorium, is unicellular, and remains unicellular whatever variety of matter it feeds on.
The Evolution of Man — Volume 1
