Diatom - Wikipedia
A feature of diatoms is the urea cycle, which links them evolutionarily to animals. In 2011, Allen et al. established that diatoms have a functioning urea cycle. This result was significant, since prior to this, the urea cycle was thought to have originated with the metazoans which appeared several hundreds of millions of years before the ...
Diatom - Definition, Reproduction and Location - Biology Dictionary
2018年1月21日 · Diatoms reside at the surface of waters during the bloom phase of their cycle since they are photosynthesizing organisms. During the “bust” phase of their lifecycle, diatoms are essentially dormant and do not reproduce. Diatoms have a rapid reproductive rate, often causing harmful algae blooms.
Diatoms – Definition, Structure, Life Cycle, Importance
2024年4月9日 · In summary, the life cycle of diatoms involves asexual reproduction through binary fission, sexual reproduction through meiosis and gamete fusion, and the formation of auxospores and resting spores. The size of diatoms can decrease due to asexual division, but sexual reproduction and auxospore formation help restore their size.
2.4.3.2: Brown Algae and Diatoms - Biology LibreTexts
Identify structures and events in the Laminaria life cycle and know their ploidy. Use life history, morphology, and cellular components to identify diatoms. Classify diatoms based on symmetry and ecology. Describe sexual and asexual reproduction in diatoms.
Diatom | Description, Characteristics, & Reproduction | Britannica
2024年11月22日 · Diatoms are commonly divided into two orders on the basis of symmetry and shape: the round nonmotile Centrales have radial markings; the elongated Pennales, which move with a gliding motion, have pinnate (featherlike) markings.
17.7: Bacillariophyta - The Diatoms - Biology LibreTexts
2020年6月16日 · Life cycle: Diplontic; Ecology: Everywhere! Marine, freshwater, and terrestrial. We are still trying to figure out how to determine what a diatom "species" is and, so far, they have been classified based on the morphology of their frustules, a silica shell made from two
Phycokey - Diatoms (Bacillariophyceae) - University of New …
Sexual reproduction is an obligate stage in the life cycle of most species. The life cycle can take months to years, while gametogenesis and fertilization usually take just hours to complete. In some cases plasmogamy occurs without karyogamy, resulting in a …
Diatom identification including life cycle stages through …
2019年4月25日 · In this paper, we propose to characterize the diatom life cycle by the main features that change during the algae life cycle, mainly the contour shape and the texture. Elliptical Fourier Descriptors (EFD) are used to describe the diatom contour while phase congruency and Gabor filters describe the inner ornamentation of the algae.
Cellular Hallmarks and Regulation of the Diatom Cell Cycle
Thus, the diatom life cycle predominantly consists of a long vegetative phase of mitotic cell divisions interrupted by only a short meiotic phase. Simplified overview of cellular events during the diatom cell cycle.
The life of diatoms in the world's oceans | Nature
2009年5月13日 · Given the crucial role of diatoms in the global carbon cycle, plans have been made, controversially, to reduce atmospheric levels of the greenhouse gas carbon dioxide by fertilizing large regions...