The seasonal distribution of Atlantic plankton organisms

Morphology and distribution of the marine centric diatom Thalassiosira antarctica Comber

“…The extremes concerning (i) diameter appear to be 10-25 p. (Jousi et al, 1962) and 51-74 p (Manguin, 1960), (ii) number of valve areolae in 10 p. , 9 (Manguin, 1954) and 17 (Cleve, 1900), and (iii) number of marginal spines in 10 p, 6 (Cleve, 1900) and 12 (Manguin, 1954). Furthermore, spines have been observed in a single marginal row (Cleve, 1900), in one or two rows (Manguin, 1954;Hustedt, 1958), often in two irregular rows (Hendey, 1937), and in one or two marginal rows and, in addition, along the rows of areolae on the valve (Joust et al, 1962). Occurrence of colonies in chain form as well as dense mucilaginous ones have been reported (Hendey, 1937).…”

Liquefaction of gases and discovery of superconductivity: two very closely scientific achievements in low temperature physics

“…The compound was independently and almost simultaneously discovered in other uranium mineral, cleveite, by the Swedish chemist Per Theodor Cleve (1840Cleve ( -1905 and his student Nils Abraham Langlet (1868-1936) [22]. Although in 1905 the American chemists Hamilton Perkins Cady (1874-1943) and his student David McFarland (1878McFarland ( -1955) discovered what would be the first industrial source in the extraction from natural gas [23], the available amounts of helium were definitively limited.…”

The Sterochemistry of Square Complexes.

“…The last was eliminated first. Cleve (22), a very active early worker in this field, clearly established the different chemical behavior of the aand /3-forms of [Pt(NH3)2Cl2]. By treating each form with a series of reagents, including the appropriate silver salts, he prepared and described new (isomeric) compounds such as the a-and / Although this and later work leaves no doubt that the a-and /3-forms are not just simply different crystalline modifications of the same substance, it is interesting to note recent confirmation along physical lines.…”

“…Small, but definite, differences have been noted in the absorption spectra of the aqueous solutions of the a-and With the elimination of the possibilities (b) and (c)-polymerism and dimorphism, respectively-the problem now resolves itself into deciding whether the a-and d-diammines are structural or geometrical isomers. One of the first attempts to understand their constitution was made by Cleve (22), who proposed structures which, in the light of the then prevailing theories of valency, seemed These formulations, which were also supported by Blomstrand, Jorgensen, and others, implied, of course, that the substances were structural isomers. With present-day knowledge of atomic structure, which enables an upper limit to be placed on the number of covalent bonds that can be formed by first-row elements of the Periodic Table, these structures can be ruled out immediately, since they both involve five covalent bonds to nitrogen.…”