Unicellular Organisms

Unicellular Organisms

 

(also unicellulars), plant or animal organisms consisting of a single cell. There are two levels of organization among unicellular organisms: prokaryotic and eukaryotic. Prokaryotic unicellulars (bacteria and some blue-green algae) lack a differentiated nucleus and do not undergo mitosis; a nucleoid contains the apparatus for the process of genetic information. Eukaryotic unicelluar organisms (green and some other algae; among animals, protozoans) have a cell nucleus that divides by mitosis. Unicellulars resemble the cells of multicellular organisms in general structure and contain a similar set of organelles. Among unicellulars, there is varying complexity of morphological differentiation, from very simply arranged organisms (amoebas, chlorellas) to extremely complex ones (infusorians, Acetabularia). Unicelluar organisms may form colonies. (See alsoMULTICELLULAR ORGANISMS.)

References in periodicals archive ?
Bioinformatics studies have revealed TRP channels in the genomes of unicellular organisms including representatives of Choanoflagellata, Chlorophyta, Dictyostelia, Euglenozoa, Ciliophora, and Thecomonadea (Cai and Clapham, 2012; Arias-Darraz et al.
7 billion years ago, when the first unicellular organisms sprung into existence in a primordial soup of organic chemicals.
The exhibition highlights that new digital technologies, such as 3D printing, provide a new capacity to mimic and model natural forms, from microscopic unicellular organisms to the macroscopic environment, to better understand the natural world.
Using a method pioneered by professor Joe Thornton at the University of Oregon - before Thornton was hired away by the University of Chicago - the researchers used the "ancestral genetic sequences" to resurrect, in the laboratory, the prehistoric protein that the unicellular organisms used to reproduce.
Unicellular organisms of the kingdom protista, characterized by a silica shell of often intricate and beautiful sculpturing.
Microalgae are unicellular organisms that are usually found in freshwater and marine systems, and are capable of performing photosynthesis, Al Harethi said.
Silab's historic understanding of the plant world has been supplemented by unique expertise related to the production and use of unicellular organisms made using biotechnologies.
The application of unicellular organisms to study the toxic effects of pesticides from contaminated wastewater is relatively new throughout the world.
In reality, a lot of the oil and gas that we have in Alberta comes from algae and other unicellular organisms that were living in oceans.
Here neurologists and other biomedical researchers explain in some detail how PAKs--particularly the oncogenic kinases PAK1 and PAK4 and their blockers--may control various aspects of life and health, and how mammalian PAKs have functionally evolved from their ancestral origins in unicellular organisms such as yeast and amoebas through a series of mutations over millions of years.
Alexander Rohrbach und Matthias Koch created a kind of light tube that traps the agile unicellular organisms.
Another theory is that the fossils are protists, which are unicellular organisms lacking a definite cellular arrangement.