منابع مشابه
Buffer capacity of the coelomic fluid in echinoderms.
The increase in atmospheric CO2 due to anthropogenic activity results in an acidification of the surface waters of the oceans. The impact of these chemical changes depends on the considered organisms. In particular, it depends on the ability of the organism to control the pH of its inner fluids. Among echinoderms, this ability seems to differ significantly according to species or taxa. In the p...
متن کاملEchinoderms
two fish. In the wild, kittiwakes have to learn to look for particular colours and patterns in the ocean to find the best place to fish. The researchers tried to recreate this for the captive birds by making them search for their food among a chequerboard of different coloured bowls. Chicks on the unrestricted fatty diet quickly learned which bowls contained food, but chicks on lean rations wer...
متن کاملPericardial coelomic cysts.
1 28 M R Respiratory Impaired percusScreening; A.P. 8 cm. 1 infection sion note and induction and breath sounds thoracoscopy 2 40 F R Pregnancy ,, ,, Screening 10,, 3 43 M R M.M.R. Nil Screening and 7, 1 Protein, 195 mg.%/ pneumoperitoneum 4 37 M L ,, ,, Screening 7 4 Protein, 400 Chloride, 690,, Urea N., 28 5 35 M L ,, ,, Screening; A.P. 74,, 1 induction; thoracoscopy 6 64 F L Dysphagia Impair...
متن کاملEchinoderms Have Bilateral Tendencies
Echinoderms take many forms of symmetry. Pentameral symmetry is the major form and the other forms are derived from it. However, the ancestors of echinoderms, which originated from Cambrian period, were believed to be bilaterians. Echinoderm larvae are bilateral during their early development. During embryonic development of starfish and sea urchins, the position and the developmental sequence ...
متن کاملThe Transfer of Coelomic Eggs between Frogs.
IN the analysis of events immediately preceding and following fertilization of the frog egg, it is frequently desirable to treat the eggs with various reagents. Any such treatment must circumvent the barrier represented by the fertilization membrane and the jelly layers. These membranes can be removed from fertilized eggs mechanically or by treatment with proteolytic enzymes (Spiegel, 1951) wit...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1958
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1539092