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mermaid's wineglass
Made by cyberjani
Acetabularia is a genus of green algae, specifically of the Polyphysaceae family, Typically found in subtropical waters, Acetabularia is a single-cell organism, but gigantic in size and complex in form, making it an excellent model organism for studying cell biology. In form, the mature Acetabularia resembles the round leaves of a nasturtium, being 0.5 to 10 cm tall and having three anatomical parts: a bottom rhizoid that resembles a set of short roots; a long stalk in the middle; and a top umbrella of branches that may fuse into a cap. The single nucleus of Acetabularia is located in the rhizoid, and allows the cell to regenerate completely if its cap is removed. The caps of two Acetabularia may also be exchanged, even from two different species. Acetabularia is most famous from the experiments of Joachim Hämmerling in the 1930s-1950s, which demonstrated that its genetic information is contained in the nucleus. This was the first demonstration that genes are encoded by DNA in eukaryotes; earlier studies by Oswald Avery and others had shown that this was true for prokaryotes. Hämmerling exchanged the caps from two species, A. mediterranea and A. crenulata. The caps of these species are different in form; however, after exchange, the caps gradually changed from their original form to that typical of its base, where the nucleus is located. In another experiment, the addition of a nucleus from another species into a single intact Acetabularia produced a hybrid cap, showing that both nuclei are influencing the form of the cap.[citation needed] Acetabularia are among the largest single-celled organisms, having also a remarkably large nucleus. During sexual reproduction, the nucleus undergoes multiple rounds of mitosis, forming many daughter nuclei all within one nuclear membrane. These nuclei undergo meiosis and are transported to the tips of the branches, the sporangia, where they are released as gametes. The name, Acetabularia, derives from the Latin word acetabulum, a broad, shallow cup used for dipping bread; the upturned cap of Acetabularia resembles such a cup. For this reason, it is also sometimes called mermaid's wineglass. (Wikipedia)


beadlet anemone
Made by cyberjani
The Beadlet anemone (Actinia equina) is a common sea anemone found on rocky shores around all coasts of the UK. Its range extends to the rest of Western Europe and the Mediterranean, and probably as far as the coast of West Africa. Actinia equina can be found both in exposed and sheltered situations. It is highly adapted to the intertidal zone as it can tolerate both high temperatures and desiccation. The anemone may also be found in regions of variable salinity such as estuaries. Underwater, it displays up to 192 tentacles, arranged in six circles. Out of water, the tentacles retract and the anemone resembles a blob of red, brown, green or orange jelly, up to about 5cm across. It has bright blue spots (known as acrorhagi) located just beneath the tentacles, organised as an external ring containing stinging cells located at the top of the column that it uses to fight over territory. The acrorhagi contains the cnidocysts which themselves contain the nematocysts. There is some evidence that the various colour forms may in fact be different species. (Wikipedia)


common limpet
Made by cyberjani
Patella vulgata is an edible species of sea snail with gills, a typical true limpet, a marine gastropod mollusc in the family Patellidae. slo. = latvica


anthozoa
Made by cyberjani
These are generally thought to be close to the ancestors of modern Scleractinians and existed during the Paleozoic Era 570-245 million years ago.


sea urchin
Made by cyberjani
The name urchin is an old name for the round spiny hedgehogs that sea urchins resemble.


Istria 156
Made by monsterinc
Small island (I think it's Sveti Grgur) in the Velebitski Channel.


land ho!
Made by cyberjani
a sailor's cry in announcing sight of land


a little place of their own
Made by cyberjani
beadlet anemone and acetabularia