منابع مشابه
Adrenalin in Annelids
1. The sympathetic nervous system and the adjuvant adrenalin-secreting system are found in their earliest form in the annelid kingdom, and consist of cells situated in the central nervous system which are the common ancestors of both, and which are both secretory and nervous in function. 2. These cells are developed in the annelid kingdom parallel with the development of a contractile vascular ...
متن کاملUndulatory locomotion of polychaete annelids:
The undulatory locomotion of polychaete annelid worms is studied as a biological paradigm of a versatile body morphology and effective motion control, adaptable to a large variety of unstructured and tortuous environmental conditions (water, sand, mud, sediment, etc.). Computational models of this type of locomotion have been developed, based on the Lagrangian dynamics of the system, on resisti...
متن کاملThe Polychaetous Annelids of Alaska
THIS PAPER is based on the polychaetous annelids obtained by the Alaska King Crab Investigation, which was sponsored by the United States Fisheries Commission. The annelids were taken almost entirely from southern and southwestern Alaska, from Port Ashton west to the western end of the Alaska Peninsula (Map I). In addition, some were obtained from scattered stations eastward to Icy Straits, nea...
متن کاملAsymmetric bifurcated halogen bonds.
Halogen bonding (XB) is being extensively explored for its potential use in advanced materials and drug design. Despite significant progress in describing this interaction by theoretical and experimental methods, the chemical nature remains somewhat elusive, and it seems to vary with the selected system. In this work we present a detailed DFT analysis of three-center asymmetric halogen bond (XB...
متن کاملPassive ventilation in benthic annelids?
NdCoO3, and LaCoO3, are strikingly similar to each other and to RCo03 where R (6) is the natural rare earth mixture as mined. We suggest, therefore, that the unseparated rare earth oxides can be used to make a cheap auto exhaust oxidation catalyst. LEE A. PEDERSEN W. F. LIBBY Department of Chemistry and Institute of Geophysics and Planetary Physics, University of California, Los Angeles 90024 R...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1892
ISSN: 0003-0147,1537-5323
DOI: 10.1086/275581