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Sökning: WFRF:(Förlin Lars 1950 ) > Tidskriftsartikel

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61.
  • Larsson, D. G. Joakim, 1969, et al. (författare)
  • Seasonal variations of vitelline envelope proteins, vitellogenin, and sex steroids in male and female eelpout (Zoarces viviparus).
  • 2002
  • Ingår i: General and comparative endocrinology. - : Elsevier BV. - 0016-6480. ; 125:2, s. 184-96
  • Tidskriftsartikel (refereegranskat)abstract
    • The seasonal variations of vitelline envelope proteins, vitellogenin (VTG), and reproductive steroids were investigated in feral male and female eelpout, Zoarces viviparus. 17beta-Estradiol was present in both sexes with a peak in prespawning fish of 2.6 ng/ml in males and 2.7 ng/ml in females. 11-Ketotestosterone peaked in June at 4.2 and 0.47 ng/ml in males and females, respectively. A surge of testosterone was seen in both sexes in August, just prior to spawning. All steroid levels were low during early pregnancy. The vitelline envelope of the eelpout is composed of two major and one minor protein with molecular weights of 50, 55, and 44 kDa, respectively. An antiserum raised against solubilized vitelline envelope from turbot (Scophthalmus maximus) cross-reacted strongly with the 50-kDa protein from the isolated vitelline envelope and a similar-sized protein in female plasma and plasma from estrogenized males. Interestingly, the 50-kDa protein was also present at low levels in males as demonstrated by ELISA and Western blotting. In males, the 50-kDa protein did not follow the seasonal changes in 17beta-estradiol, but instead showed an almost perfect negative correlation with water temperature. VTG was present in female plasma as shown by Western blotting, but VTG was not detectable in male plasma despite relatively high endogenous estrogen levels. This suggests that the VTG induction by estradiol may be modulated by other factors in the eelpout.
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62.
  • Larsson, D. G. Joakim, 1969, et al. (författare)
  • Studies of masculinization, detoxification, and oxidative stress responses in guppies (Poecilia reticulata) exposed to effluent from a pulp mill.
  • 2002
  • Ingår i: Ecotoxicology and environmental safety. - : Elsevier BV. - 0147-6513. ; 52:1, s. 13-20
  • Tidskriftsartikel (refereegranskat)abstract
    • Potential masculinization, detoxification, and oxidative stress responses were assessed in domesticated female guppies (Poecilia reticulata) exposed for 42 days to diluted effluent from a modern Swedish kraft pulp mill or a model androgen. Methyltestosterone induced male-like coloration and transformation of the anal fin into a gonopodium-like structure. The effluent did not induce any apparent changes of the anal fin morphology; however, the exposed guppies became more colored than control fish, which could be an androgenic response. A better understanding of the physiological mechanisms involved in these responses would be required for a full evaluation. Both primary effluent and effluent which had undergone activated sludge treatment caused a moderate but significant induction of hepatic ethoxyresorufin-O-deethylase (EROD) activity. However, the general toxicity of both effluents was low, as mortality was negligible even at 25% dilutions. There was a continuous production of offspring in all groups (47-62% female fry), except by methyltestosterone-treated females, which did not reproduce. There were no indications that either effluent caused oxidative stress since hepatic glutathione reductase, glutathione S-transferase and DT-diaphorase activities remained unchanged compared with controls.
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63.
  • Larsson, Åke, 1944, et al. (författare)
  • Hälsotillståndet hos abborre och tånglake
  • 2007
  • Ingår i: Havet 2007 - om miljötillståndet i svenska havsområden. - 1654-6741. ; 2007, s. 100-102
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • Inom den nationalla marina kustfiskövervakningen har känsliga biomarkörer använts sedan 1988 för att kartlägga hälsotillståndet hos fisk. Här redovisas undersökningar på abborre och tånglake för de områden som har de längsta tidsserierna. De flesta biomarkörerna indikerar en god hälsostatus. Några erhållna mätdata talar dock för att fisken är påverkad av en ökad exponering för något eller några miljögifter. Detta kan vara tidiga tecken på på miljöförändringar som på sikt kan få allvarliga konsekvenser för fiskpopulationer i våra kustområden.
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64.
  • Larsson, Åke, 1944, et al. (författare)
  • Kustfisk hälsa
  • 2005
  • Ingår i: Bottniska viken - årsrapport från den marina miljöövervakningen 2004. - 1400-2760. ; :2004, s. 24-26
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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65.
  • Larsson, Åke, 1944, et al. (författare)
  • Kustfisk - hälsa
  • 2010
  • Ingår i: HAVET 2010. - 1654-6741.
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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66.
  • Larsson, Åke, 1944, et al. (författare)
  • Kustfisk - hälsa
  • 2011
  • Ingår i: HAVET - Om miljötillståndet i svenska havsområden. - 1654-6741. ; år 2011
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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67.
  • Larsson, Åke, 1944, et al. (författare)
  • Kustfisken - alltmer påverkad av miljögifter
  • 2011
  • Ingår i: HAVET 2011 - Om miljötillståndet i svenska havsområden. - 1654-6741. ; år 2011, s. 74-79
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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68.
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69.
  • Lehtonen, K. K., et al. (författare)
  • The BEEP project in the Baltic Sea: Overview of results and outline for a regional biological effects monitoring strategy
  • 2006
  • Ingår i: Marine Pollution Bulletin. - : Elsevier BV. - 0025-326X. ; 53:8-9, s. 523-537
  • Tidskriftsartikel (refereegranskat)abstract
    • Field studies in the framework of the EU funded BEEP project (Biological Effects of Environmental Pollution in Marine Coastal Ecosystems, 2001-2004) aimed at validating and intercalibrating a battery of biomarkers of contaminant exposure and effects in selected indicator species in the Mediterranean, the North Atlantic and the Baltic Seas. Major strategic goals of the BEEP project were the development of a sensitive and cost-efficient biological effects monitoring approach, delivery of information and advice to end-user groups, and the implementation of a network of biomarker researchers around Europe. Based on the main results obtained in the Baltic Sea component of the BEEP the present paper summarises and assesses the applicability of biomarkers for different regions and species in this sea area. Moreover, a general strategy and some practical considerations for the monitoring of biological effects in the Baltic Sea are outlined. (c) 2006 Elsevier Ltd. All rights reserved.
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70.
  • Lennquist, Anna, 1978, et al. (författare)
  • Colour and melanophore function in rainbow trout after long term exposure to the new antifoulant medetomidine
  • 2010
  • Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 80:9, s. 1050-1055
  • Tidskriftsartikel (refereegranskat)abstract
    • Medetomidine is a new antifouling agent, and its effects in non-target aquatic organisms have been investigated. Earlier short-term studies in fish have shown a skin lightening response to medetomidine, but effects after chronic exposure have not been studied. In fish, the dark pigment melanin is contained within specialized cells, melanophores. Medetomidine binds to the melanophore α2-adrenoceptor, which stimulates pigment aggregation resulting in the light appearance. In the present study, rainbow trout (Oncorhynchus mykiss) was long-term exposed to 0.5 and 5.0 nM of medetomidine via water for 54 d. The fish were then photographed for paleness quantification and the images were analyzed using ImageJ analysis software. Additionally, scales were removed and used for in vitro function studies of the melanophores, monitoring the response to melanophore stimulating hormone (MSH) and subsequent medetomidine addition. The number of melanophores was also investigated. As a result of the medetomidine exposure, fish from the 5 nM treatment were significantly paler than control fish and the melanophores from these fishes were also more aggregated. Melanophores from all the treatments were functional, responding to MSH by dispersion and to subsequent medetomidine by aggregation. However, the results indicate a difference in sensitivity among treatments. The number of melanophores in the scales did not change significantly after long term exposure to medetomidine. These results suggest that the observed paleness may be reversible, even after chronic exposure.
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  • Resultat 61-70 av 100
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Förlin, Lars, 1950 (100)
Larsson, Åke, 1944 (29)
Sturve, Joachim, 196 ... (26)
Larsson, D. G. Joaki ... (24)
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Bignert, A. (7)
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Kling, Peter, 1968 (5)
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Gercken, J. (5)
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Dave, Göran, 1945 (3)
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