Suchergebnisse
Suchergebnisse:
Film Production. Website. protozoa .com. Protozoa Pictures is an American production company founded in 1997 by American filmmaker Darren Aronofsky, [1] headquartered in New York City. It is mainly a handle for Aronofsky's filmography, but has financed other projects alongside Aronofsky's.
YearFilmDirectorProduction Company (s)1998—2000—20022006Darren Aronofsky- New York City, United States
- Film Production
Protozoa Pictures ist ein Filmproduktionsunternehmen in den Vereinigten Staaten. Allgemeines. Protozoa Pictures wurde 1997 von Regisseur Darren Aronofsky in New York City gegründet und ist seitdem vor allem für die Produktion seiner Filme zuständig, aber auch andere Projekte werden finanziert.
- 1997
Browse 12,340 authentic protozoa stock photos, high-res images, and pictures, or explore additional bacteria or paramecium stock images. See protozoa micrographs, illustrations, and abstract shapes and textures formed by bubbles and drops.
- History of Classification
- Phylogenetic Distribution
- Characteristics
- Ecology
The word "protozoa" (singular protozoon) was coined in 1818 by zoologist Georg August Goldfuss (=Goldfuß), as the Greek equivalent of the German Urthiere, meaning "primitive, or original animals" (ur- 'proto-' + Thier 'animal'). Goldfuss created Protozoa as a class containing what he believed to be the simplest animals. Originally, the group includ...
Protistans are distributed across all major groups of eukaryotes, including those that contain multicellular algae, green plants, animals, and fungi. If photosynthetic and fungal protistans are distinguished from protozoa, they appear as shown in the phylogenetic tree of eukaryotic groups. The Metamonada are hard to place, being sister possibly to ...
Reproduction
Reproduction in Protozoa can be sexual or asexual. Most Protozoa reproduce asexually through binary fission. Many parasitic Protozoa reproduce both asexually and sexually. However, sexual reproduction is rare among free-living protozoa and it usually occurs when food is scarce or the environment changes drastically. Both isogamy and anisogamyoccur in Protozoa, anisogamy being the more common form of sexual reproduction.
Size
Protozoans, as traditionally defined, range in size from as little as 1 micrometre to several millimetres, or more. Among the largest are the deep-sea–dwelling xenophyophores, single-celled foraminifera whose shells can reach 20 cm in diameter.
Habitat
Free-living protozoa are common and often abundant in fresh, brackish and salt water, as well as other moist environments, such as soils and mosses. Some species thrive in extreme environments such as hot springs and hypersaline lakes and lagoons. All protozoa require a moist habitat; however, some can survive for long periods of time in dry environments, by forming resting cyststhat enable them to remain dormant until conditions improve.
Free-living
Free-living protozoa are found in almost all ecosystems that contain free water, permanently or temporarily. They have a critical role in the mobilization of nutrients in ecosystems. Within the microbial food web they include the most important bacterivores. In part, they facilitate the transfer of bacterial and algal production to successive trophic levels, but also they solubilize the nutrients within microbial biomass, allowing stimulation of microbial growth. As consumers, protozoa prey u...
Parasitism
Many protozoan pathogens are human parasites, causing serious diseases such as malaria, giardiasis, toxoplasmosis, and sleeping sickness. Some of these protozoa have two-phase life cycles, alternating between proliferative stages (e.g., trophozoites) and resting cysts, enabling them to survive harsh conditions.
Commensalism
A wide range of protozoa live commensally in the rumens of ruminant animals, such as cattle and sheep. These include flagellates, such as Trichomonas, and ciliated protozoa, such as Isotricha and Entodinium.The ciliate subclass Astomatia is composed entirely of mouthless symbionts adapted for life in the guts of annelid worms.
Protozoan. From Wikimedia Commons, the free media repository. English: Protozoa (from the Greek words πρωτό, proto, meaning first, and ζωα, zoa, meaning animals; singular protozoon or also protozoan) are a diverse group of single-cell eukaryotic organisms, many of which are motile.
Browse a collection of images of protozoans, tiny single-celled organisms found in freshwater and marine habitats. See protozoans in different shapes, sizes and features using various imaging techniques.
28. Apr. 2017 · Learn about protozoa, a diverse group of single-celled eukaryotes that include parasites, photosynthesizers, and predators. See images and examples of different protozoa phyla, such as malaria, red tide, and ciliates.
