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Alge Alge Alge Definition VideoOpen Mix Session with Chris Lord-Alge Există alge monocelulare (clorela, claminominada ș. a.) și alge pluricelulare (oscilatoria, ulotriscul, laminaria ș. a.). Dimensiunile lor variază de la miimi de milimetru la zeci de metri. Componența chimică a corpului algelor este în funcție de bazinul de apă (mare, râu, lac, iaz) în care cresc. De regulă, algele populează grosul apei, se dezvoltă pe fundul bazinelor sau pe. Algele (lat. Algae - „iarbă de mare”) constituie un grup diversificat din Regnul Chromista, Regnul Plante dar și unele organisme din Regnul Monera Cuprins 1 Caracteristicile generale ale algelor. Algae are simple plants that can range from the microscopic (microalgae), to large seaweeds (macroalgae), such as giant kelp more than one hundred feet in length. Microalgae include both cyanobacteria, (similar to bacteria, and formerly called “blue-green algae”) as well as green, brown and red algae.
Verstehe ich beim Roulette sowieso nicht warum, die Lamatsch wann und wie. - PARTNER & SPONSORENOffizieller Merchandise. Über Services Details Stellen Premiereleague. Über mich. Zum Kontakt. Commonly, in sexual reproduction of unicellular and colonial algae, two specialized, sexually compatible, haploid gametes make physical contact and fuse to form a zygote. Show More. Algae Alge Alge Alge, singular algamembers of a group of predominantly aquatic photosynthetic organisms of the kingdom Protista. Unlike macroalgaewhich were clearly viewed as plants, microalgae were frequently considered animals because they are often motile. Otero, J. Most of the simpler algae are unicellular flagellates or amoeboidsbut colonial and nonmotile forms have developed Echtgeld Bonus Ohne Einzahlung Casino among several of the groups. The eukaryotic algae are polyphyleticmeaning that they did not evolve from a single common ancestor. Such algae grow on mud, stones, Tennis Vorhersage algae and plants, or animals, according to "Algae. Osmotrophy is the absorption of dissolved substances, and phagotrophy involves engulfing bacteria or other Spielautomaten Kostenlos prey. New Phytologist. Lamina Pneumatocyst. All algae have the ability to produce energy-rich oils and several microalgal species naturally accumulate high levels of oil in their dry mass. In the first three of these groups Chromistathe chloroplast has four membranes, retaining a nucleomorph in cryptomonadsand they likely share a common pigmented ancestor, although other evidence casts doubt on whether the heterokontsHaptophytaand cryptomonads are in fact more closely related to each other than to other groups. Some unicellular species of green algaemany golden algaeeuglenidsdinoflagellatesand other algae have become heterotrophs also called colorless or apochlorotic algaesometimes parasitic, relying entirely on external energy sources and have limited or no photosynthetic apparatus.
The algae are not closely related in an evolutionary sense, and the phylogeny of the group remains to be delineated. Specific groups of algae share features with protozoa and fungi that, without the presence of chloroplasts and photosynthesis as delimiting features, make them difficult to distinguish from those organisms.
Indeed, some algae appear to have a closer evolutionary relationship with the protozoa or fungi than they do with other algae.
This article discusses the algae in terms of their morphology , ecology, and evolutionary features. For a discussion of the related protists, see the articles protozoan and protist.
For a more complete discussion of photosynthesis, see the articles photosynthesis and plant. Algae Article Media Additional Info.
Article Contents. Print print Print. Table Of Contents. In other words, most algae are autotrophs or more specifically, photoautotrophs reflecting their use of light energy to generate nutrients.
However, there exist certain algal species that need to obtain their nutrition solely from outside sources; that is, they are heterotrophic.
Such species apply a variety of heterotrophic strategies to acquire nutrients from organic materials carbon containing compounds such as carbohydrates, proteins and fats.
Osmotrophy is the absorption of dissolved substances, and phagotrophy involves engulfing bacteria or other such prey. Other algae, known as auxotrophs, need to only acquire essential vitamins such as the B 12 complex or fatty acids according to "Algae".
According to the authors of "Algae," it is widely accepted that the nutritional strategies of algae exist on a spectrum combining photoautotrophy and heterotrophy.
This ability is known as mixotrophy. Algae are capable of reproducing through asexual or vegetative methods and via sexual reproduction.
According to the authors of "Algae," asexual reproduction involves the production of a motile spore, while vegetative methods include simple cell division mitosis to produce identical offspring and the fragmentation of a colony.
Sexual reproduction involves the union of gametes produced individually in each parent through meiosis. These are also referred to as blue-green algae.
Though they are capable of conducting oxygen-producing photosynthesis and live in many of the same environments as eukaryotic algae, cyanobacteria are gram-negative bacteria , and therefore are prokaryotes.
They are also capable of independently conducting nitrogen fixation, the process of converting atmospheric nitrogen to usable forms of the element such as ammonia.
The prefix "cyano" means blue. These bacteria have pigments that absorb specific wavelengths of light and give them their characteristic colors.
Many cyanobacteria have the blue pigment phycocyanin, a light-harvesting pigment it absorbs red wavelengths of light.
Cyanobacteria all have some form of the green pigment chlorophyll, which is responsible for harvesting light energy during the photosynthetic process Current Biology, Some others also have the red pigment phycoerythrin, which absorbs light with the green region and bestows the bacteria with a pink or red color.
The eukaryotic algae are polyphyletic , meaning that they did not evolve from a single common ancestor.
This is clearly demonstrated in our current understanding of the tree of life — a family tree of all living organisms organized by their various evolutionary relationships.
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Enter your email and join our newsletter list for updates and news on the industry. Archived from the original on 27 February Archived from the original on 2 July Retrieved 25 August Farblose Algen.
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