The taxonomic status of quill worms, genus Hyalinoecia (Polychaeta: Onuphidae), from the North American Atlantic continental slope

Morphological characters of quill worms from the North American continental slope have been compared with those of Hyalinoecia tubicola (O. F. Müller) from the English Channel. The results indicate consistent and exclusive differences in worms of the same size. We suggest that Hyalinoecia artifex Verrill be reinstated for North American quill worms, as originally intended

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∼99% of the euchromatic genome and is accurate to an error rate of ∼1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead

On the Relationship between P50 and the Mode of Gas Exchange in Tropical Crustaceans

In general, the oxygen affinity of hemocyanin does not decrease when tropical decapod crustaceans carryon gas exchange in air instead of water. Other oxygenation properties such as cooperativity and the Bohr shift also change very little, if at all. The generalization of a higher oxygen affinity in tropical than in temperate zone species appears to be true but has exceptions of unclear origins, emphasizing the crudity of correlations between respiratory properties of the blood and gross features of the environment

The Nautilus Siphuncle as an Ion Pump

The siphuncle, which is believed to empty the newly formed chambers of the shell by a process involving the active transport of NaCl, has the metabolic, enzymatic, and morphological features of a transporting epithelium. It is capable of removing monovalent ions from solutions containing only Na+ and no Cl- or divalent ions, or only Cl- and no Na+ or divalent ions, indicating no obligatory coupling. The Na+ and Cl- are removed from native cameral fluid at approximately the same ratio. The levels of K + and the divalent ions are also lowered, but at slightly different rates. Neither H+ nor NH1 accumulate in cameral fluid to an appreciable extent

Studies on speciation in maldanid polychaetes of the North American Atlantic Coast. I. A taxonomic revision of three species of the subfamily Euclymeninae

Volume: no.65 (1962)Start Page: 1End Page: 1

Birds observed in the Imhoff Gardens of Dhahran, and at Ras Tanura, Saudi Arabia 1959-1962

Volume: no.59 (1962)Start Page: 1End Page: 1

Two new species of Clymenella (Polychaeta: Maldanidae) from Brazil

Volume: 104Start Page: 1End Page: 1

A Note on the Structural Organization of the Cardiac Myofiber in Nautilus pompilius

The ultrastructure of the cardiac myofiber in Nautilus resembles that of bivalves more than the decapod cephalopods. The fiber is nonstriated, the mitochondrial density is relatively small and the cristae poorly developed, and the sarcoplasmic tubule system is either sparse or absent. These features suggest that the Nautilus heart is not highly adapted to enhance the transport of large volumes of oxygen to the tissues and that the adaptations found in the decapods arose within the class Cephalopoda

OXYGEN UPTAKE AND TRANSPORT IN THE PROSOBRANCH MOLLUSC BUSYCON CANALICULATUM (L.) II. INFLUENCE OF ACCLIMATION SALINITY AND TEMPERATURE

Volume: 158Start Page: 118End Page: 12

ADAPTATIONS TO ENVIRONMENTAL OXYGEN LEVELS IN INFAUNAL AND EPIFAUNAL SEA ANEMONES

Volume: 143Start Page: 657End Page: 67