The Experts below are selected from a list of 9996 Experts worldwide ranked by ideXlab platform
Jussi V. K. Kukkonen - One of the best experts on this subject based on the ideXlab platform.
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bioaccumulation and toxicity of sediment associated herbicides ioxynil pendimethalin and bentazone in lumbriculus variegatus oligochaeta and chironomus riparius insecta
Ecotoxicology and Environmental Safety, 2003Co-Authors: Kimmo Maenpaa, Arto J Sormunen, Jussi V. K. KukkonenAbstract:Abstract The benthic macroinvertebrates Lumbriculus variegatus and Chironomus riparius were used in toxicity and bioaccumulation tests to determine the toxic concentrations and accumulation potential of sediment associated herbicides. The tested chemicals were ioxynil, bentazone, and pendimethalin. The bioaccumulation tests with L. variegatus were performed in four different sediments, each having different characteristics. Water-only LC50 tests were performed with both L. variegatus and C. riparius. A Sublethal Effect of model compounds in sediments was assessed by a C. riparius larvae growth-inhibition test. Of the model compounds, ioxynil appeared to be the most toxic, with LC50 values 1.79 and 2.79 mg L−1 for L. variegatus and C. riparius, respectively. The LC50 water concentrations for bentazone were 79.11 and 62.31 mg L−1 for L. variegatus and C. riparius, respectively. Similarly, ioxynil revealed the highest bioaccumulation potential in bioaccumulation tests. The most important characters affecting chemical fate in the sediment seemed to be the organic matter content and the particle size fraction. The sediments with low organic material and coarse particle size consistently showed high bioaccumulation potential and vice versa. In C. riparius growth tests bentazone had a statistically significant Effect on larval growth at sediment concentrations of 1160 and 4650 mg kg−1 (P
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bioaccumulation and toxicity of sediment associated herbicides ioxynil pendimethalin and bentazone in lumbriculus variegatus oligochaeta and chironomus riparius insecta
Ecotoxicology and Environmental Safety, 2003Co-Authors: Kimmo Maenpaa, Arto J Sormunen, Jussi V. K. KukkonenAbstract:The benthic macroinvertebrates Lumbriculus variegatus and Chironomus riparius were used in toxicity and bioaccumulation tests to determine the toxic concentrations and accumulation potential of sediment associated herbicides. The tested chemicals were ioxynil, bentazone, and pendimethalin. The bioaccumulation tests with L. variegatus were performed in four different sediments, each having different characteristics. Water-only LC50 tests were performed with both L. variegatus and C. riparius. A Sublethal Effect of model compounds in sediments was assessed by a C. riparius larvae growth-inhibition test. Of the model compounds, ioxynil appeared to be the most toxic, with LC50 values 1.79 and 2.79 mg L−1 for L. variegatus and C. riparius, respectively. The LC50 water concentrations for bentazone were 79.11 and 62.31 mg L−1 for L. variegatus and C. riparius, respectively. Similarly, ioxynil revealed the highest bioaccumulation potential in bioaccumulation tests. The most important characters affecting chemical fate in the sediment seemed to be the organic matter content and the particle size fraction. The sediments with low organic material and coarse particle size consistently showed high bioaccumulation potential and vice versa. In C. riparius growth tests bentazone had a statistically significant Effect on larval growth at sediment concentrations of 1160 and 4650 mg kg−1 (P<0.05). It is noteworthy that standard deviations tend to be greater at high chemical concentrations, which addresses the fact that part of the individuals started to suffer. Ioxynil had an Effect on the larval growth in other test sediment at the highest concentration (15.46 mg kg−1 dw), in which head capsule length correlated with larval weight, decreasing toward higher exposure concentrations. The current results show the importance of sediment organic matter as a binding site of xenobiotics.
Niloufar Sangak Sani Bozhgani - One of the best experts on this subject based on the ideXlab platform.
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Sublethal Effects of atropa belladonna herbal extract on biological performance of the two spotted spider mite tetranychus urticae koch acari tetranychidae
The Journal of Agricultural Science, 2018Co-Authors: Ayad Alsendi, Mohammadreza Havasi, Niloufar Sangak Sani BozhganiAbstract:The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important pests of agricultural products. Using chemical pesticides is one of the main methods for its management. Due to undesirable Effects of synthetic pesticides, this research was conducted to achieve alternative safe compounds. In this study Sublethal Effect of Atropa belladonna herbal extract including LC10, LC20, LC30 and distilled water were evaluated on biological parameters (such as r, λ, GRR, R0 and T) of T. urticae. The experiments were done under laboratory condition at 25±2 °C, 60±5% RH, and a photoperiod of 16:8 (L: D) hours. The crude data were analyzed based on age-stage, two-sex life table analysis. The results indicated significant reduction in female’s duration of maturation, oviposition period and total fecundity by increasing examined dose. The highest and lowest values of the net reproductive rate (R0) were obtained 38.41 and 18.08 offspring/individual in control and LC30, respectively. The maximum values of intrinsic rate of increase (r) was 0.2201 day-1that occurred on control treatment while the minimum values was obtained 0.1937 day-1 in LC30 concentration. Finite rate of increase (λ) had significantly descended with concentration enhancing from LC20 to LC30, compared with the control. The results demonstrated that Atropa belladonna herbal extract could be incorporated in integrated pest management (IPM) programs of T. urticae.
Alice Hontela - One of the best experts on this subject based on the ideXlab platform.
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bioenergetic costs of heavy metal exposure in yellow perch perca flavescens in situ estimates with a radiotracer 137cs technique
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Graham D Sherwood, Julie C Brodeur, Joseph B Rasmussen, David J Rowan, Alice HontelaAbstract:While the flow of energy is understood to determine the growth of organisms and the productivity of ecosystems, little is known about the Sublethal Effect of pollutants on the energetic efficiency of wild populations. We used field estimates of fish growth coupled to in situ estimates of food consumption rates obtained from the mass balance of a globally dispersed, trophically transferred radiotracer (137Cs) to demonstrate the bioenergetic impairment of yellow perch (Perca flavescens) from lakes polluted by heavy metals (Cd, Cu, and Zn). Annual growth increment relative to the total energy budget (conversion efficiency) was about three times lower in cortisol-impaired yellow perch from metal-polluted lakes relative to yellow perch from reference lakes (4.2% compared with 10.8%), suggesting that fish exposed to pollutants experienced greater total energetic costs. In addition, metal-polluted lakes were dominated by adult yellow perch populations and simplified prey bases, suggesting that Effects are occurr...
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bioenergetic costs of heavy metal exposure in yellow perch perca flavescens in situ estimates with a radiotracer 137cs technique
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Graham D Sherwood, Julie C Brodeur, Joseph B Rasmussen, David J Rowan, Alice HontelaAbstract:While the flow of energy is understood to determine the growth of organisms and the productivity of ecosystems, little is known about the Sublethal Effect of pollutants on the energetic efficiency ...
Kimmo Maenpaa - One of the best experts on this subject based on the ideXlab platform.
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bioaccumulation and toxicity of sediment associated herbicides ioxynil pendimethalin and bentazone in lumbriculus variegatus oligochaeta and chironomus riparius insecta
Ecotoxicology and Environmental Safety, 2003Co-Authors: Kimmo Maenpaa, Arto J Sormunen, Jussi V. K. KukkonenAbstract:Abstract The benthic macroinvertebrates Lumbriculus variegatus and Chironomus riparius were used in toxicity and bioaccumulation tests to determine the toxic concentrations and accumulation potential of sediment associated herbicides. The tested chemicals were ioxynil, bentazone, and pendimethalin. The bioaccumulation tests with L. variegatus were performed in four different sediments, each having different characteristics. Water-only LC50 tests were performed with both L. variegatus and C. riparius. A Sublethal Effect of model compounds in sediments was assessed by a C. riparius larvae growth-inhibition test. Of the model compounds, ioxynil appeared to be the most toxic, with LC50 values 1.79 and 2.79 mg L−1 for L. variegatus and C. riparius, respectively. The LC50 water concentrations for bentazone were 79.11 and 62.31 mg L−1 for L. variegatus and C. riparius, respectively. Similarly, ioxynil revealed the highest bioaccumulation potential in bioaccumulation tests. The most important characters affecting chemical fate in the sediment seemed to be the organic matter content and the particle size fraction. The sediments with low organic material and coarse particle size consistently showed high bioaccumulation potential and vice versa. In C. riparius growth tests bentazone had a statistically significant Effect on larval growth at sediment concentrations of 1160 and 4650 mg kg−1 (P
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bioaccumulation and toxicity of sediment associated herbicides ioxynil pendimethalin and bentazone in lumbriculus variegatus oligochaeta and chironomus riparius insecta
Ecotoxicology and Environmental Safety, 2003Co-Authors: Kimmo Maenpaa, Arto J Sormunen, Jussi V. K. KukkonenAbstract:The benthic macroinvertebrates Lumbriculus variegatus and Chironomus riparius were used in toxicity and bioaccumulation tests to determine the toxic concentrations and accumulation potential of sediment associated herbicides. The tested chemicals were ioxynil, bentazone, and pendimethalin. The bioaccumulation tests with L. variegatus were performed in four different sediments, each having different characteristics. Water-only LC50 tests were performed with both L. variegatus and C. riparius. A Sublethal Effect of model compounds in sediments was assessed by a C. riparius larvae growth-inhibition test. Of the model compounds, ioxynil appeared to be the most toxic, with LC50 values 1.79 and 2.79 mg L−1 for L. variegatus and C. riparius, respectively. The LC50 water concentrations for bentazone were 79.11 and 62.31 mg L−1 for L. variegatus and C. riparius, respectively. Similarly, ioxynil revealed the highest bioaccumulation potential in bioaccumulation tests. The most important characters affecting chemical fate in the sediment seemed to be the organic matter content and the particle size fraction. The sediments with low organic material and coarse particle size consistently showed high bioaccumulation potential and vice versa. In C. riparius growth tests bentazone had a statistically significant Effect on larval growth at sediment concentrations of 1160 and 4650 mg kg−1 (P<0.05). It is noteworthy that standard deviations tend to be greater at high chemical concentrations, which addresses the fact that part of the individuals started to suffer. Ioxynil had an Effect on the larval growth in other test sediment at the highest concentration (15.46 mg kg−1 dw), in which head capsule length correlated with larval weight, decreasing toward higher exposure concentrations. The current results show the importance of sediment organic matter as a binding site of xenobiotics.
Ayad Alsendi - One of the best experts on this subject based on the ideXlab platform.
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Sublethal Effects of atropa belladonna herbal extract on biological performance of the two spotted spider mite tetranychus urticae koch acari tetranychidae
The Journal of Agricultural Science, 2018Co-Authors: Ayad Alsendi, Mohammadreza Havasi, Niloufar Sangak Sani BozhganiAbstract:The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important pests of agricultural products. Using chemical pesticides is one of the main methods for its management. Due to undesirable Effects of synthetic pesticides, this research was conducted to achieve alternative safe compounds. In this study Sublethal Effect of Atropa belladonna herbal extract including LC10, LC20, LC30 and distilled water were evaluated on biological parameters (such as r, λ, GRR, R0 and T) of T. urticae. The experiments were done under laboratory condition at 25±2 °C, 60±5% RH, and a photoperiod of 16:8 (L: D) hours. The crude data were analyzed based on age-stage, two-sex life table analysis. The results indicated significant reduction in female’s duration of maturation, oviposition period and total fecundity by increasing examined dose. The highest and lowest values of the net reproductive rate (R0) were obtained 38.41 and 18.08 offspring/individual in control and LC30, respectively. The maximum values of intrinsic rate of increase (r) was 0.2201 day-1that occurred on control treatment while the minimum values was obtained 0.1937 day-1 in LC30 concentration. Finite rate of increase (λ) had significantly descended with concentration enhancing from LC20 to LC30, compared with the control. The results demonstrated that Atropa belladonna herbal extract could be incorporated in integrated pest management (IPM) programs of T. urticae.
