Results 241 to 250 of about 31,894 (267)

Products of haem synthesis in polychaetes

Comparative Biochemistry and Physiology, 1965
Abstract 1. 1. The tetrapyrrole pigments accumulated by annelid polychaetes have been extracted and identified. 2. 2. The haemoglobin- and chlorocruorin-synthesizing tissues contain large amounts of free porphyrins and corresponding haematins. The same compounds may also be found in other tissues. Traces of free porphyrin exist in the blood.
R. Phillips Dales, Charlotte P. Mangum
openaire   +3 more sources

Longevity in a Polychaete and a Coelenterate [PDF]

Nature, 1963
IN December 1949 I collected a small group of the serpulid Mercierella enigmatica Fauvel, which lives in brackish-water as well as in the sea, growing on reeds in Lake Mariout, Alexandria, Egypt. I brought the dozen or so of the tube-worms back to London and kept them alive for a number of years in a small aquarium containing sea-water diluted half-and-
openaire   +1 more source

Mechanisms of locomotion in the polychaete, Harmothoë

Comparative Biochemistry and Physiology, 1970
1. 1. During forward walking parapodial stepping and s waves occur; the two can be separated by sectioning appropriate segmental nerves. 2. 2. Thirty cycles of stepping begin at the pygidium/min and move rostrally over 3–10 segments/sec. 3. 3.
James V. Lawry, James V. Lawry
openaire   +3 more sources

Polychaete worms

1930
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +1 more source

The metabolism of iodine by a polychaete

Comparative Biochemistry and Physiology, 1970
Abstract 1. 1. Nereis diversicolor contains between 23 and 30 μg of iodine per g. 2. 2. Iodide is absorbed at about 5 ng/g per day under conditions approximating to the normal environment. 3. 3. Most of this is subsequently lost in mucus secreted, but 15 to 30 per cent becomes bound in the basal regions of the chaetae where tanning is ...
openaire   +2 more sources

Amphipacific Distribution of Polychaetes

Journal of the Fisheries Research Board of Canada, 1971
Some 25 polychaete species common to Asiatic and American coasts are recorded in south-boreal and subtropical waters of the Pacific; they are absent in both northern cold regions (Bering and Okhotsk seas) and in tropical zones. Examples are also given of analogous, closely related twin species, and subspecies.
openaire   +2 more sources

Bioluminescence in Pelagic Polychaetes

Journal of the Fisheries Research Board of Canada, 1971
Of six holopelagic polychaete families, the Tomopteridae and Alciopidae are the only ones having representatives that appear to be photogenic. Previous investigators localized the site of photogenic organs to certain parapodial glands in the tomopterids. Photogenic organs have not been demonstrated in the alciopids, but some species have been reported
openaire   +2 more sources

Sex economy in benthic polychaetes

Ethology Ecology & Evolution, 1995
Among polychaetes sequential hermaphrodites are generally protandrous and their sex allocation strategy appears to fit well with the Ghiselin size advantage hypothesis. In Ophryotrocha puerilis male reproductive success drops with increasing size because females prefer to mate with small males to avoid a costly conflict over sex. Moreover both partners
M. Premoli, SELLA, Gabriella
openaire   +3 more sources

Polychaete Sibling Species

1980
Capitella capitata was formerly regarded as an excellent cosmopolitan indicator species for marine pollution or environmental disturbance. Following an oil spill in West Falmouth, Massachusetts in September 1969, when most of the benthic marine fauna was killed, the subsequent responses of a number of polychaete and other invertebrate species allowed ...
openaire   +2 more sources

Methods of Culturing Polychaetes

1975
The purpose of this paper is neither to review the literature on polychaete reproduction nor to describe the diverse reproductive habits and developmental stages that occur among polychaetes. Rather, this is an attempt to summarize the “do’s, don’t’s, and probably’s” pertaining to the successful culture of this fascinating group of marine invertebrates.
David Dean, Michael Mazurkiewicz
openaire   +2 more sources