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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Hox patterning in the annelid leech helobdelia and phylogenetic analysis /

Kourakis, Matthew J. January 1999 (has links)
Thesis (Ph. D.)--University of Chicago, Dept. of Organismal Biology and Anatomy, August 1999. / Includes bibliographical references. Also available on the Internet.
2

Applicability of mitochondrial genome data to annelid phylogeny and the evolution of group II introns

Zhong, Min. Halanych, Kenneth M., January 2009 (has links)
Thesis (Ph. D.)--Auburn University. / Abstract. Includes bibliographical references.
3

Etudes sur l'histologie comparée du système nerveux chez quelques annélides propositions de botanique données par la Faculté /

Faivre, Ernest January 1900 (has links)
Thèse : Zoologie : Faculté des Sciences de Paris : 1856. / Titre provenant de l'écran-titre.
4

The effect of nervous tissue extracts on neurosecretion in the earthworm Lumbricus terrestris.

Marapao, Bienvenido Piezas. January 1959 (has links)
Thesis--Catholic Univ. of America.
5

Long term biological rhythmicity and reproduction : An experimental study of Harmothoe imbricata (L.) (Polychaeta : Polynoidae)

Clarke, S. January 1987 (has links)
No description available.
6

Spirobranchus giganteus (serpulidae, polychaeta, annelida): neurosecretion, regeneration, larvae rearing, ecology

Pocock, Dorothy Margaret Elaine. January 1964 (has links)
Spirobranchus sisanteus is a tropical serpulid (Annelida, Polychaeta, Serpulidae, sub-family Serpulines) (Grasse, 1959), of common occurrence throughout the British West Indies. The species has been reported from the Caribbean by Ehlers (1887) and Hullin (1923) and recently vas collected in Jamaica and Barbados by Marsden and desoribed by her in some detail (Marsden, 1900). The author became interested in two aspects of Spirobranchus giganteus: neurosecretion, and the eoological diversity shown by the Barbados population of the serpulid. Neurosecretion in the invertebrates is a relatively new field of research, of which polychaete neurosecretory investigation is a thriving branch. However, there was found in the literature only one reference to neurosecretion in serpulids. Studies to determine whether Spirobranohus sisanteus exhibits neurosecretory activity therefore held great interest for the author. / fr
7

Population sizes of Enchytraeidae in agricultural plots in NE Scotland and their effect on soil structure

Dawod, Virginia January 1993 (has links)
The Enchytraeidae (Annelida, Oligochaeta) are small whitish worms especially prevalent in moorland and coniferous forest soils. They are less abundant but show varying densities in agricultural soils. They are important in soil decomposition processes and soil structure formation. This thesis reports the results of a study into the population sizes of the enchytraeids in agricultural plots at Craibstone Farm, five miles west of Aberdeen, Scotland, and the reasons for the variations in population size. It also describes the effects of the enchytraeids on soil structure, as determined from careful study of soil thin sections by light microscope and image analysis. The agricultural plots at Craibstone Farm grew an eight-year crop rotation at seven different pH levels. The average enchytraeid population size was found to be 3,5000 m<sup>-2</sup> in the first year and 11,000 m<sup>-2</sup> in the second. Populations tended to be larger at lower pH (4.2 to 5.2) and under pasture rather than annual crops. Fertilizer was seen to reduce numbers in the short-term but increases were seen in the long-term. In nearby grassland and mixed woodland, populations were considerably larger due to higher soil organic matter and moisture contents. At all sites the enchytraeids concentrated in the top 5cm of the soil, again correlating with moisture content. During the two years of sampling populations were seen to be smallest in late summer, coinciding with low rainfall. Soil thin sections showed that at low pH enchytraeids produced abundant granular faecal pellets which eventually fused to form a soil matrix. At higher pH (5.2 and above) small clusters of faecal pellets were more commonly seen partially or totally infilling soil channels and earthworm vermiform fragments were seen to be broken down into smaller granules.
8

Studies of fertilization in Platynereis megalops

Just, Ernest Everett, January 1915 (has links)
Thesis (Ph. D.)--University of Chicago, 1916. / Reprinted from Biological bulletin, Vol. 27, No. 4 (October, 1914); Vol. 28, No. 2 (February, 1915). Reprinted from Journal of Morphology, Vol. 26, No. 2 (June 1915). Includes bibliographical references (p. 211-212, 226-227, 113-114).
9

Studies of fertilization in Platynereis megalops

Just, Ernest Everett, January 1915 (has links)
Thesis (Ph. D.)--University of Chicago, 1916. / Reprinted from Biological bulletin, Vol. 27, No. 4 (October, 1914); Vol. 28, No. 2 (February, 1915). Reprinted from Journal of Morphology, Vol. 26, No. 2 (June 1915). Includes bibliographical references (p. 211-212, 226-227, 113-114).
10

Studies of fertilization in Platynereis megalops /

Just, Ernest Everett, January 1915 (has links)
Thesis (Ph. D.)--University of Chicago, 1916. / Reprinted from Biological bulletin, Vol. 27, No. 4 (October, 1914); Vol. 28, No. 2 (February, 1915) Reprinted from Journal of Morphology, Vol. 26, No. 2 (June 1915) Includes bibliographical references (p. 211-212, 226-227, 113-114) Also available on the Internet.

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