17 Result(s)

Article

Ontogeny of sexual differentiation in different strains of zebrafish (Danio rerio)

The zebrafish (ZF) undergoes juvenile hermaphroditism, where in all fish, the gonad first develops as an ovary-like structure, before the sex is fixed and the gonad then differentiates into either a testis or ...

G. Maack, H. Segner, C.R. Tyler in Fish Physiology and Biochemistry (2003)

Article

Confinement stress and starvation modulate the induction of EROD activity after dietary exposure to PCB 126 in the Mozambique tilapia (Oreochromis mossambicus)

Polychlorinated biphenyls (PCBs) are environmental pollutants, accumulating in the food chain and inducing cytochrome P450 1A (CYP P450 1A) monooxygenase enzymes. This study aimed to investigate the influence ...

E.S. Quabius, D.T. Nolan, H. Segner… in Fish Physiology and Biochemistry (2001)

Article

Post-prandial protease activity in the digestive tract of African catfish Clarias gariepinus larvae fed decapsulated cysts of Artemia

The alkaline proteolytic activity in the gut of African catfish larvae was studied during short time ranges from 30 min to 4 h after ingestion of decapsulated Artemia cysts. The variation in total protease and tr...

A. García-Ortega, J. Verreth, H. Segner in Fish Physiology and Biochemistry (2000)

Chapter

Wirkungsorientierte Identifikation toxischer organischer Inhaltsstoffe in Flußsedimenten

Sedimente stellen eine bedeutende Senke sowohl für lipophile organische Schad-stoffe als auch für Schwermetalle dar. Während eine Reduktion der Schadstoffeinträge in Oberflächengewässer in der Regel relativ sc...

W. Brack, R. Altenburger, U. Ensenbach, S. Nehls… in Stoffhaushalt von Auenökosystemen (2000)

Article

Bioassay-Directed Identification of Organic Toxicants in River Sediment in the Industrial Region of Bitterfeld (Germany)—A Contribution to Hazard Assessment

Bioassay-directed identification of toxicants in an acetonic extract of a sediment of the riverine Spittelwasser in the industrial region of Bitterfeld (Germany) was conducted. For this purpose, a combinatio...

W. Brack, R. Altenburger, U. Ensenbach… in Archives of Environmental Contamination an… (1999)

Article

Viability and differential function of rainbow trout liver cells in primary culture: Coculture with two permanent fish cells

The study investigates the influence of different culture conditions on attachment, viability and functional status of rainbow trout (Oncorhynchus mykiss) liver cells in primary culture. Cells were isolated by a ...

S. Scholz, T. Braunbeck, H. Segner in In Vitro Cellular & Developmental Biology - Animal (1998)

Article

Immunohistochemical Detection of Vitellogenin in Male Brown Trout from Swiss Rivers

The detection of vitellogenin, a yolk precursor protein, may serve as a biomarker for exposure to environmental oestrogens as its induction by xenobiotic oestrogens in the immature and male fish has been repor...

T. Wahli, W. Meier, H. Segner, P. Burkhardt-Holm in The Histochemical Journal (1998)

Chapter

Fish cell lines as a tool in aquatic toxicology

In aquatic toxicology, cytotoxicity tests using continuous fish cell lines have been suggested as a tool for (1) screening or toxicity ranking of anthropogenic chemicals, compound mixtures and environmental sa...

H. Segner in Fish Ecotoxicology (1998)

Article

An immunohistochemical analysis of the ontogeny, distribution and coexistence of 12 regulatory peptides and serotonin in endocrine cells and nerve fibers of the digestive tract of the turbot, Scophthalmus maximus (Teleostei)

 The ontogeny of endocrine cells and nerve fibers containing immunoreactivities for 12 regulatory peptides and serotonin was studied in the digestive tract of a flatfish, the turbot (Scophthalmus maximus), using ...

M. Reinecke, C. Müller, H. Segner in Anatomy and Embryology (1996)

Article

The development of functional digestive and metabolic organs in turbot, Scophthalmus maximus

The functional status of organ systems involved into the processing of exogenous food is critical for the survival and growth of fish early life stages. The present study on laboratory-reared larval turbot, Scoph...

H. Segner, V. Storch, M. Reinecke, W. Kloas, W. Hanke in Marine Biology (1994)

Article

The sequential restoration of plasma metabolite levels, liver composition and liver structure in refed carp,Cyprinus carpio

Effect of realimentation was studied on the structure and function of liver tissue of carp,Cyprinus carpio. Yearling carp, after a 3-month starvation period, were renourished at a feeding rate of 1% body weight p...

R. Böhm, W. Hanke, H. Segner in Journal of Comparative Physiology B (1994)

Article

Weaning experiments with turbot (Scophthalmus maximus): Electron microscopic study of liver

Weaning, i.e. the change from live to dry food, is a critical stage in the rearing of turbot (Scophthalmus maximus). In order to obtain a more detailed understanding of the associated functional processes, an ele...

H. Segner, U. Witt in Marine Biology (1990)

Chapter and Conference Paper

Dual distribution of cardiac hormones (CDD/ANP) in the heart and brain of vertebrates

About four years ago, several research groups independently isolated and characterized cardiac hormones from the atrial appendages of some mammalian species. As a consequence of the different isolation procedu...

M. Reinecke, D. Betzler, H. Segner… in Functional Morphology of the Endocrine Hea… (1989)

Article

Contaminated food and uptake of heavy metals by fish: a review and a proposal for further research

1. The uptake of heavy metals via the alimentary tract can be an important factor for the metal budget of fish. 2. Concepts such as biomagnification, bioaccumulation, biotransference, or concentration factors,...

R. Dallinger, F. Prosi, H. Segner, H. Back in Oecologia (1987)

Article

Importance of contaminated food for the uptake of heavy metals in the rainbow trout, Salmo gairdneri

H. Segner, H. Back in Naturwissenschaften (1985)