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Showing 1 to 20 of 94 for “"LC50"”.
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Predicción del valor de concentración letal media, LC50 y del nivel de toxicidad de compuestos orgánicos para Daphnia Magna usando algoritmos de aprendizaje automático supervisado
… kernel radial. El modelo de predicción del valor LC50 llegó a un Q2 de 0.77 y un R2 de 0.83 en la validación externa y el modelo de clasificación alcanzó un 0.80 de precisión.
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The Effect of Dieoffs of Asian Clams (Corbicula fluminea) on Native Freshwater Mussels (Unionidae)
… mussel glochidia were the most sensitive (24-hr LC50 of 0.11 mg/L NH₃-N). Juvenile and adult mussels were similarly sensitivity, with average 96-hr LC50's of 0.49 and 0.52 mg/L NH₃-N, respectively. Adult C. fluminea were the least sensitive, having an average LC50 of 0.80 mg/L NH₃-N. The EPA …
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Evaluating the Feasibility of Rearing Juvenile Freshwater Mussels in a Flow-Through Pond System at White Sulphur Springs National Fish Hatchery
… renewal conditions at 12°C and 20°C. Calculating LC50 values with the Trimmed Spearman-Karber method, juveniles of L. fasciola (mean 96 h LC50 of 0.26 mg/L NH3-N) were significantly more tolerant of unionized ammonia than juveniles of V. iris (mean 96 h LC50 of 0.11 mg/L NH3-N). The only organisms …
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Developing novel natural and synthetic tools for a more sustainable management of Euschistus heros (Hemiptera: Pentatomidae)
… treatment. For P. graveolens essential oil, the LC50 was 1,784 µL/L (?2= 4.1627, P = 0.2444), and the LC80 reached 5,368 µL/L. For M. verticillata essential oil, the LC50 was 2,483 µL/L (?2= 1.9762, P = 0.3723), and the LC80 was 5,365 µL/L. In addition, to parasitoid T. podisi, P. graveolens EO …
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Pengaruh pemberian ekstrak etanol daun sirsak (Annona muricata L.) terhadap pertumbuhan sel neuroglia baby hamster yang dipapar dengan 7, 12-Dimetilbenz (α) Antrasen (DMBA) dalam kondisi in vitro
… bertujuan untuk mengetahui pengaruh dan nilai LC50 pemberian ekstrak etanol daun sirsak (Annona muricata L.) terhadap pertumbuhan sel neuroglia baby hamster yang dipapar dengan 7,12-dimetilbenz (α) antrasen (DMBA) dalam kondisi in vitro. Penelitian ini menggunakan sel neuroglia yang diambil …
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Assessment of Bioactivity of Se-lected Plants against Pests and Microbes from Agro-pastoral Communities in Mbulu District, Tanzania
… shrimp cytotoxicities ranges of P. dodecandra, (LC50 = 4.6 – 34.7 μg/mL), Cynoglossum geometrium (LC50 = 71.09 μg/mL) and Ocimum filamentosum (LC50 = 28.08 μg/mL) are indicate potential cyto-toxicity of plants. P. dodecandra leaf extracts killed 98% of Sitophilus zeamais and 99% of Tribollium …
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Acute toxicity of ammonia and nitrite to Pacific White Shrimp (Litopenaeus vannamei) at low salinities
… were also conducted at 10 ppt salinity. The LC50 values for TAN at 18 ppt salinity, TAN at 10 ppt salinity, and NO2-N at 10 ppt were observed to be 42.92, 39.72 mg/L (2.26 and 2.09 mg/L unionized ammonia-N), and 153.75 mg/L, respectively. When NO₂- N was adjusted to the LOEC level and TAN …
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Growth, survivability, and reproductive effects of pulse-dosed endosulfan on jordanella floridae (florida flagfish) over one complete life-cycle
… pulse-exposure. The 96 hour continuous exposure LC50 in larval flagfish was 4.35 μg/L; sub-lethal observations included hyperactivity, convulsions, and some axis malformation. The effects of a 4 hour endosulfan pulse-exposure on 7-8 day-old larval growth, reproduction, and survivability were …
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Pengaruh ekstrak pegagan (Centella asiatica linn.) terhadap pertumbuhan kultur primer sel hepar baby hamster yang dipapar 7.12- dimetilbenz(α)antrasen
… nilai sitotoksisitas ekstrak dinyatakan dengan LC50 sebesar 874.7228 µg/mL (LC50 < 1000 µg/mL, ekstrak bersifat toksik). ENGLISH: Cancer is the growth and development of cells that are abnormal and uncontrollable. Environmental factors have been identified the cause of the occurrence of cancer …
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Validation of laboratory versus field avoidance behavior of schooling fathead minnows to heavy metal blends relative to acute toxicity during long term exposure
… level exposure in the laboratory had a 96-hr LC50 value 1.25X higher than laboratory control fish. Laboratory control fish avoided metals levels at 0.4% of their 96-hr LC50. Fish exposed to the metals blend in the field had a 96-hr LC50 value 1.41X higher than field control fish. Field control …
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Use of non-lethal endpoints to establish water quality requirements and optima of the Topeka Shiner (notropis topeka)
… based on lethal level experiments (e.g. LC50 tests), which are poorly suited for assessing optimal water quality conditions or sub-lethal effects of common stressors. Measurements below threshold values may still impede organismal growth and development, especially considering the complex …
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Evaluation of Chelex 100 and Assessing the Impact of Fulvic Acid (NOM) on Copper Toxicity and Bioavailability to Americamysis bahia
… per test condition, were used to determine the LC50 and EC50 of copper and the effects of NOM. Test solutions consisted of artificial synthetic seawater at 20 parts per thousand containing concentrations of 0, 100, 200, 400, 800 ug/L copper with either 0, 12, 24 mg/L NOM. Forty-eight hour acute …
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Toxicity of zinc, copper, and sediments to early life stages of freshwater mussels in the Powell River, Virginia
… sensitive species tested, with 24-hr and 48-hr LC50 values for glochidia ranging from 423 to 725 μg Zn/L. Glochidia of the pheasantshell (Actinonaias pectorosa) exhibited LC50 values from 274 to 2886 μg Zn/L, depending on test conditions. Similar results were obtained for glochidia of the …
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Toxicological Analysis of the Neonicotinoid Insecticide Imidacloprid to Honey Bees, Apis mellifera, of Different Colonies
… different colonies. After determining a range of LC50 values in the tested colonies, I examined the metabolic detoxification activities of honey bees collected from two colonies that represented the highest and lowest LC50 values, between which there was a 36-fold difference in their LC50 values. …
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Resistance evaluation and management of Colorado potato beetle, Leptinotarsa decemlineata (Say), using novel chemistries
… was highly toxic to L. decemlineata with LC50 values of 0.013 and 0.164 g ai/L for larvae and adults, respectively. Tolfenpyrad was also toxic to eggs with 0% hatching after being dipped in a field rate concentration. In field efficacy trials, potato plots treated with tolfenpyrad at rates …
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Field- and laboratory-determined behavioral avoidance and gill histological alterations of fish in response to acidic and alkaline pH conditions
… conditions at pH 6.0-7.0, well above the 96-hr LC50 values of 4.05 and 4.24 for trout and golden shiners, respectively. When the pH was gradually increased, avoidance thresholds of pH 9.5- 11.0 were observed, beyond the 96-hr LC50 values of 9.13 and 8.86 for trout and golden shiners. Single …
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Phototoxic target lipid model for predicting the toxicity of polycyclic aromatic hydrocarbons and petroleum to aquatic life
… measured either as median lethal concentration (LC50) at a fixed duration of exposure or median lethal time (LT50) at a fixed concentration. The model accounts for differences in the physical and chemical properties of PAHs and test species sensitivities, as well as variations in light …
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Uji sitotoksisitas rebusan daun sirsak (Annona muricata Linn) terhadap kultur primer sel otak baby hamster yang dipapar 7,12 dimetilbenz(α)antrasen (DMBA).
… dengan analisis probit untuk menentukan nilai LC50(Lethal Concentration 50%). Hasil penelitian ini menunjukkan bahwa rebusan daun sirsak (Annona muricata Linn) mampu menurunkan presentase konfluenitas dengan nilai terendah [13%±0.03] terhadap kultur primer sel otak baby hamster yang dipapar …
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Optimization of extraction parameters of selected Malaysian plants towards antiurolithiatic activities (IN-VITRO)
… non-toxic effect on optimized A. occidentale (LC50, 1412.50μg/mL) but A. malaccencis (LC50, 30.50μg/mL) revealed toxic effects. This study has given basic scientific evidence that optimum extraction condition is necessary to obtain optimum antiurolithiatic activity.
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Acute and chronic effects of selenium on Daphnia pulex
… as selenite-selenium. Daphnia pulex had a 48 hr LC50 of 3.87 mg/l selenium. The 96 hr LC50 and EC50O values for Gambusia affinis and Physa sp. respectively, were 12.56 and 27.08 mg/l selenium. The sublethal effects of 0.2, 0.4, 0.6 and 0.8 mg/1 selenium on survival, growth and reproduction of …
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