Index of Living and Fossil Echinoids 1924-1970

Arthur Kohlenberg 1924-1970 (Obituary)

Arthur Kohlenberg, one of the best-known members of the Information Theory Group, died on July 19, 1970 from Hodgkins' disease. His career spanned a number of disciplines. He received his B.A. in physics from Columbia at the age of 19. After three years as an army officer, he continued in physics at Harvard, where he received his Ph.D. in 1950. Subsequently, after two years of teaching quantum ...

Investigation of the various factors in destruction of living and fossil corals in Persian Golf

Living fossil or evolving virus?

Although virus-like organisms are thought to have appeared together with the earliest forms of cellular life, their origin remains a mystery and we have little idea of the features of ancient viruses. Conversely, we know a lot about modern viruses, which show great diversity in genome organization and replication machinery, probably due to their antagonistic co-evolution with host defence mecha...

A living fossil in the genome of a living fossil: Harbinger transposons in the coelacanth genome.

Emerging data from the coelacanth genome are beginning to shed light on the origin and evolution of tetrapod genes and noncoding elements. Of particular relevance is the realization that coelacanth retains active copies of transposable elements that once served as raw material for the evolution of new functional sequences in the vertebrate lineage. Recognizing the evolutionary significance of c...

Ahermatypic Coral Banks: Living and Fossil Counterparts

Reef-like structures referred to as banks are produced by framework-building ahermatypic scleractinians in cool water at various depths, usually below those of hermatypic shallow-water reef corals. The distribution of Holocene banks is closely related to the ecological requirements of the ahermatypic corals. Fifteen major regions of bank development are known today in the Atlantic and Pacific a...