| 1. |
- Berglind, Rune, 1952, et al.
(author)
-
THE EFFECTS OF LEAD ON DELTA-AMINOLEVULINIC-ACID DEHYDRATASE ACTIVITY, GROWTH, HEMOGLOBIN CONTENT, AND REPRODUCTION IN DAPHNIA-MAGNA
- 1985
-
In: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY. - 0147-6513. ; 9:2, s. 216-229
-
Journal article (peer-reviewed)abstract
- The effects of continuous exposure to lead for various periods and recovery in clean water on δ-aminolevulinic acid dehydratase (ALA-D) activity, hemoglobin content, growth, and reproduction were studied in Daphnia magna. Steady-state inhibition of ALA-D activity was reached within 2 days in 16, 64, and 256 μg Pb liter−1, but restoration in clean water was prolonged in relation to previous exposure. In spite of the inhibition of ALA-D activity hemoglobin content increased after 2 days in 16 and 24 μg Pb liter−1. Furthermore, hemoglobin content in previously exposed animals increased during recovery in clean water. Maximum hemoglobin content (2.9 times control value) was found after 2 days recovery of animals exposed to 64 μg Pb liter−1. These findings suggest that some enzyme(s) other than ALA-D in the biosynthetic pathway of hemoglobin formation is (are) more sensitive to lead. Growth, in contrast to reproduction, was stimulated by low concentrations of lead (<64 μg Pb liter−1), although in 256 μg Pb liter−1 growth was also significantly impaired. After 19 days the 16 and 50% reproductive impairment concentrations were ⩽1 and 10 μg Pb liter−1, respectively.
|
|
| 2. |
- Dave, Göran, 1945, et al.
(author)
-
Effects of cortisol on the fatty acid composition of the total blood plasma lipids in the European eel, Anguilla anguilla L.
- 1979
-
In: Comparative Biochemistry and Physiology A. - 1095-6433. ; 64:1, s. 37-42
-
Journal article (peer-reviewed)abstract
- 1.1. Fatty acid composition of plasma total lipids was studied in the European eel, Anguilla anguilla L., 1, 4 and 14 days after daily intraperitoneal injections of cortisol (5 mg cortisol-21-phosphate-Na-salt/kg b.w.). 2.2. Cortisol treatment resulted in an elevated percentage of 18:0∗, 20:4 and 20:5 together with a lowered percentage of 16:1 and 18:1, and a lowered plasma lipid triglyceride-phospholipid molar ratio. 3.3. The results suggest that cortisol has a stimulating action on the breakdown of triglycerides and on the metabolism of fatty acids.
|
|
| 3. |
- Dave, Göran, 1945, et al.
(author)
-
Effects of insulin on the fatty acid composition of the total blood plasma lipids in the european EEL, Anguilla anguilla L
- 1979
-
In: Comparative Biochemistry and Physiology A. - 1095-6433. ; 62:3, s. 649-653
-
Journal article (peer-reviewed)abstract
- 1.1. The fatty acid composition of plasma total lipids in the European eel, Anguilla anguilla L., was studied 3, 10, 24, 96, 168 and 336 hr after i.p. injection of bovine insulin (100 i.u./kg body wt) dissolved in glycine-NaOH buffer solution. Control eels were treated by buffer solution only. 2.2. The insulin-treated eels showed an elevated percentage of palmitoleic acid (16:1) 3 and 336 hr post-injection compared to buffer-treated control eels. 3.3. Insulin caused a significant decrease in the percentage of oleic acid (18:1) 336 hr post-injection. 4.4. Besides the observations mentioned above insulin was not found to have any pronounced effects on the fatty acid composition of total blood plasma lipids.
|
|
| 4. |
- Dave, Göran, 1945, et al.
(author)
-
Metabolic and hematological effects of starvation in the European eel, Anguilla anguilla L.—I. Carbohydrate, lipid, protein and inorganic ion metabolism
- 1975
-
In: Comparative Biochemistry and Physiology A. - 1095-6433. ; 52:3, s. 423-430
-
Journal article (peer-reviewed)abstract
- 1.The effects of starvation on different metabolities in blood, liver and muscle and the level of cortisol and some inorganic ions in plasma were studied in eels, Anguilla anguilla L., after 11, 47, 96 and 164 days. 2.During the first 96 days the eels apparently used mainly liver and muscle triglycerides and this utilization was accompanied by an increase in water content. 3.Between 47 and 96 days the levels of blood glucose and muscle glycogen increased followed by a decrease. 4.Between 96 and 164 days there was a marked decrease in liver glycogen and plasma protein while the triglyceride and water content of liver and muscle was unaffected. 5.The alterations in cholesterol and phospholipids and the possible role of LCAT (lecithin:cholesterol acyltransferase) in the regulation of these parameters is discussed. 6.During the entire starvation period the level of inorganic phosphate in blood plasma decreased and the level of blood lactate, plasma sodium and plasma cortisol increased. 7.The plasma chloride initially decreased followed by an increase after 96 days. These alterations in plasma chloride are discussed in relation to hematological studies and the level of plasma protein.
|
|
| 5. |
- Dave, Göran, 1945, et al.
(author)
-
Metabolic and hematological effects of starvation in the european eel, Anguilla anguilla L.—III. Fatty acid composition
- 1976
-
In: Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. - 1096-4959 .- 1879-1107. ; 53:4, s. 509-515
-
Journal article (peer-reviewed)abstract
- 1.1. Fatty acid composition in liver and muscle was studied in the European eel (Anguilla anguilla L.) after 11, 47, 96 and 164 days of starvation during the winter season. 2.2. The changes in muscle were small compared with those in liver. 3.3. In both liver and muscle there was a marked decrease in 14:0.∗ 4.4. In the liver starvation caused a decrease in 16:1, 18:1, 20:1 and/or 18:3 and an increase in 20:4, 20:5, 22:4 and 22:5. 5.5. The observed changes are discussed in relation to differences in distributional pattern among the lipid classes, to α- and β-positional preferences and to environmental temperature.
|
|
| 6. |
- Dave, Göran, 1945, et al.
(author)
-
Metabolic and hematological studies on the yellow and silver phases of the European eel, Anguilla anguilla L.—II. Fatty acid composition
- 1974
-
In: Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. - 1096-4959 .- 1879-1107. ; 43:3, s. 583-591
-
Journal article (peer-reviewed)abstract
- 1.1. Fatty acid composition in liver, muscle and gonads of yellow and silver phases of the European eel (Anguilla anguilla L.) was determined by gas-liquid chromatography (GLC). 2.2. Significantly higher amounts of were found in the gonads of silver eels compared to yellow eels. 3.3. In the gonads of silver eels the amounts of the unsaturated acids, palmitoleic (16:1), oleic (18:1) and linoleic (18:2), were significantly higher while the amount of palmitic acid (16:0) was significantly lower. 4.4. In the liver the amount of stearic (18:0) and arachidonic acid (20:4) was significantly lower, while the amount of linoleic acid (18:2) was significantly higher in the silver phase.
|
|
| 7. |
- Lewander, Kerstin, et al.
(author)
-
Metabolic and hematological studies on the yellow and silver phases of the European eel, Anguilla anguilla L.—I. Carbohydrate, lipid, protein and inorganic ion metabolism
- 1974
-
In: Comparative Biochemistry and Physiology - Part B: Biochemistry & Molecular Biology. - 1096-4959 .- 1879-1107. ; 47:3, s. 571-581
-
Journal article (peer-reviewed)abstract
- 1.1. The contents of different metabolites were determined in white and dark muscle, liver, blood and gonads of the yellow and silver phases of the European eel, Anguilla anguilla L. 2.2. The plasma cortisol level in the silver eels was lower than in the yellow eels. 3.3. The silver eels also showed an increased redistribution and utilization of fat as well as a changed carbohydrate and protein metabolism. 4.4. An enhanced content of dark muscle was found in the silver eels, indicating an adaptation for spawning migration.
|
|
| 8. |
- Lewander, Kerstin, et al.
(author)
-
Metabolic effects of insulin in the European eel, Anguilla anguilla L
- 1976
-
In: General and Comparative Endocrinology. - 0016-6480 .- 1095-6840. ; 29:4, s. 455-467
-
Journal article (peer-reviewed)abstract
- Eels were injected intraperitoneally with insulin (100 IU/kg) and during 14 days the effects on different metabolites in blood, liver and muscle were studied. Exogenous insulin had a marked effect on carbohydrate metabolism. The observed changes (hypoglycemia, depletion of hepatic glycogen and an initial increase in muscle glycogen formation) indicate that insulin in eels induces effects on carbohydrate metabolism qualitatively similar to those found in mammals. Insulin also appears to have an important function in the regulation of lipid metabolism in eels, indicated by a rapid decrease in plasma FFA and a somewhat delayed decrease in other blood lipids. Protein metabolism and plasma inorganic ions were only slightly affected after insulin injection.
|
|
| 9. |
- Lidman, Ulf, et al.
(author)
-
Metabolic effects of cortisol in the European eel, Anguilla anguilla (L.)
- 1979
-
In: Comparative Biochemistry and Physiology A. - 1095-6433. ; 63:3, s. 339-344
-
Journal article (peer-reviewed)abstract
- 1.1. Yellow European eels were intraperitoneally injected with Cortisol (5 mg/kg body weight of hydrocortisone-21-phosphate-Na-salt) in 0.9% saline or saline only daily during 14 days. 2.2. Sampling of blood and tissues was performed after 1, 4 and 14 days and parameters of inorganic ion, carbohydrate, protein and lipid metabolism were studied. 3.3. As expected, the blood plasma cortisol levels were significantly elevated at all sampling events as an effect of cortisol injections. 4.4. These elevated cortisol levels had a stabilizing effect on osmoregulation and weak hypokalemic and hyperphosphatemic actions. 5.5. Further, a stimulated liver gluconeogenesis and carbohydrate metabolism together with evidence for an enhanced lipolysis were observed.
|
|
| 10. |
- Sjöbeck, Maj-Lis, 1945, et al.
(author)
-
Hematological effects of cortisol in the european eel, Anguilla anguilla L.
- 1978
-
In: Comparative Biochemistry and Physiology A. - 1095-6433. ; 60:2, s. 165-168
-
Journal article (peer-reviewed)abstract
- 1.1. Eels. Anguilla anguilla L., were daily injected intraperitoneally for 14 days with cortisol (5 mg/kg body wt hydrocortisone-21-phosphate-Na-salt in 0.9% saline) and the effects of this treatment on some hematological variables were studied after 1, 4 and 14 days. 2.2. The cortisol treatment did not affect hematocrit, hemoglobin content or red blood cell count. 3.3. The cortisol-treated fish showed a decreased total number of white blood cells. The number of lymphocytes was significantly reduced after cortisol treatment, while the number of neutrophilic granulocytes showed an increase at the end of the experiment.
|
|
