A. Jespersen

Publications9
h-index8
Citations304
Highly Influential Citations19
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Effects of nonylphenol and 17 beta-oestradiol on vitellogenin synthesis, testicular structure and cytology in male eelpout Zoarces viviparus.
Nonylphenol has been found to be oestrogenic in fish and may influence the reproductive system of male fish. In the present study, the effects of low (10 microg g-1 week-1) and high (100 microg g-1… Expand
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Gonadal morphogenesis and sex differentiation in intraovarian embryos of the viviparous fish Zoarces viviparus (Teleostei, Perciformes, Zoarcidae): A histological and ultrastructural study
It is essential to know the timing and process of normal gonadal differentiation and development in the specific species being investigated in order to evaluate the effect of exposure to… Expand
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Morphology of the kidney in larvae of Bufo viridis (Amphibia, Anura, Bufonidae)
This study deals primarily with the morphology and ultrastructure of the pronephros in the green toad Bufo viridis during prometamorphosis when the pronephros and the developing mesonephros function… Expand
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Sperm transfer and reproductive biology in species of hermaphroditic bivalves (Galeommatoidea: Montacutidae)
The histology of the reproductive organs is studied in the protandric hermaphroditic Tellimya ferruginosa. In NW Europe the species reproduces from May through August. Sperm transfer takes place when… Expand
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Morphology, structure of dimorphic sperm, and reproduction in the hermaphroditic commensal bivalve Pseudopythina tsurumaru (Galeommatoidea: Kellidae)
In Japan Pseudopythina tsurumaru is an up to 10.8 mm‐long commensal of the burrowing sea cucumber Protankyra bidentata, whereas in Hong Kong the same species is smaller and associated with the crab… Expand
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Ultrastructure of the protonephridium in Prostoma graecense (Bohmig) (Rhynchocoela, Enopla, Hoplonemertini)
Fine structure studies show that (1) the terminal cell is an elongated thin‐walled and fenestrated basket with a multiciliary flame. Many short curved microvilli are confined to the cell lumen, while… Expand
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Alteration of tissue vanadium content in diabetes.
A great deal of interest in the element vanadium has been generated recently because of its potential as a therapeutic agent for diabetes mellitus. Vanadium's insulin-mimetic properties and its… Expand
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Spermiogenesis, sperm structure and fertilization in the palaeonemertean Cephalothrix rufifrons (Nemertini, Anopla)
SummaryThe spermatozoan from testes of Cephalothrix rufifrons consists of an elongated, straight head 13–14 μm long with a flattened anterior acrosome and a 12.5-μm-long nucleus. Placed along one… Expand
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ULOPHYSEMA OERESUNDENSE BRATTSTROM, 1936 (CRUSTACEA, ASCOTHORACICA)
Ulophysema oeresundense Brattstrim, 1936, is a highly specialized crustacean that spends its adult life enclosed in different organs of its sea urchin host. The morphological adaptations of the… Expand