| :: acute tox daphnia c |
Between pH 6.5 and 9.0, acute toxicities of aluminum reported by EPA (1988- toxicity tests of aluminum on the nematode, Caenorhabditis elegans, ranged from 1.8 to 79 mg/L . In Daphnia magna, it has been shown that aluminum
(Diethyl fumarate). Structural Formula. C = C. H. COOC 2H5. C2H5OOC. H daphnia); 72h EC50 = 1.1 mg/l (acute algae); 72h NOEC < 0.56 mg/l (acute algae ); lowest toxicity data to algae, acute-NOEC of Selenastrum capricornutum ( 0.56
C 100mg/m3. None Acute oral toxicity : LD50: 4700mg/kg[rat], LD50: 7500mg/ kg[mouse] Daphnia acute toxicity : 48hrEC50: 10000mg/l[Daphnia magna]
Swiss Albino, Balb/C, Of1. Mice Peri-natal and Post-natal development toxicity studies in rats . Acute daphnia toxicity, Acute algae lc50, Biodegradation
Daphnia magna is a species of Daphnia (a cladoceran freshwater water flea) are reared at 25°C. Daphnids are easy to culture, requiring only water containing 202 is a 48 hour acute toxicity study, where young Daphnia are exposed to
introduced in the environments of C. reinhardtii and D. magna and a third test for the bioaccumulation test some Daphnia were fed nano-treated alga in fresh water conducted a study of the acute toxicity of carbon fullerenes with juvenile
"Acclimation" means, for Acute Toxicity Testing, an organism's Static Acute Toxicity Tests on Waste-waters with Daphnia, D 4229-84,
In this study, acute toxicity tests were performed on Daphnia magna to determine if . (A) Water alone (control, no AlSO4 added), (B), AlSO4 alone, (C) AlSO4 in
A 48-Hour Static Acute Toxicity Test with the Cladoceran (Daphnia magna ) - Summary. 2000. 226-0087 Study: Toxicity of PFOS/PFOA to C. tentans. 2004
extract was transferred into a vial, sealed, and kept in a refrigerator (4 °C) .. The LC50 values for acute aquatic toxicity with daphnia magna in mg/L were 3.7
After sampling, the sediment was cooled (4 °C) and kept in the dark (Ingersoll et al., 1995), Acute toxicity for Daphnia magna was found in 18% of the samples,
Comparative Biochemistry and Physiology Part C: Comparative Pharmacology .. Cadmium and zinc tolerances of Daphnia magna obtained in acute toxicity
Abstract—Acute and chronic toxicity of eight agricultural adjuvants (Bond, Kinetic, Plyac, R-11, X-77, and WaterMaxx) to Daphnia pulex were evaluated with 48-h acute lethal concentration 0.1C, 50% RH, and a 16:8-h light:dark regimen.
Acute toxicity for Daphnia is expressed as the median effective concentration . ( set A+B, A+C, B+C) and validation set consisted of 1/3 of the compounds (C, B,
1.4. INFORMATION ON THE T EST SUBSTANCE. Results of an acute toxicity test (see Method C.2, Part I) performed with Daphnia magna should be available.
The 24 h EC50 values for different dye effluent samples A, B, C, D, E and F were 1.35 Out of 8 industries effluents tested, 5 showed 100% immobility of daphnia at 50% of Determination of acute toxicity of the chemical products is one of the
existing Daphnia sp. acute immobilisation test (OECD 1984). Keywords: develop and apply a surface-water toxicity test using C. sphaericus. One of the
The acute toxicology data submitted were considered to be adequate for the These studies were conducted on daphnia, rainbow trout, mirror carp, green alga , S, Bühl, C., Pinch, C. CGA169374 (Difenoconazole) / ZA5504 (Azoxystrobin):
Abstract—A diverse laboratory population of Daphnia magna Straus was established by combining . acute toxicity tests were conducted simultaneously under iden- .. c Different from the control and reduced-control populations (p. 0.05).
We also tested the acute toxicity of these four active oils earlier mentioned and their constituents against Daphnia magna Straus. against C. quinquefasciatus and Aedes aegypti (L.) and Anopheles stephensi Liston (Batra et
Acute toxicity (96-h LC50) values for fish range from invertebrates ranged from 0.10 mg⋅L-1 for Daphnia pulex. A . c/o Manitoba Statutory Publications
Daphnia Effects on LPC-SWNTs Solubility. One of the early observations during the acute toxicity test was the formation of a black precipitate in
Toxicology (in vitro). Toxicology (in vitro). ECOTOX
Effluents collected from treatment units receiving a 50-mg/L surfactant feed at 25 C showed no acute toxicity to either Daphnia or fathead
Development of a biotic ligand model to predict the acute toxicity of cadmium to Daphnia pulex. Authors: Matthew Clifford, James C McGeer. Aquatic toxicology
Like the fish acute toxicity, the Daphnia acute toxicity. (EC50) is . G∞CDSW b. DG∞SW c. DG∞ENPH d. G∞CDSH e. DG∞SH f. G∞CDSWH g. MW. MR. 1
ylate distribution causes a decrease in acute toxicity to Daphnia (Figure 2). The. 48-hr LC 50 value for C14AE1 is 0.83 mg/L, while the corresponding value for. C
affected the acute and chronic toxicity of copper. Daphnia magna were widely used and, with few an extensive use of C. dubia as an experimental animal
Cyclic ether compound C. Company. 5 - 20 confidential . Daphnia acute toxicity : 48hrEL50：16.3mg/L[Daphnia magna] (data of similar product). Algae growth
c University of Ljubljana, Biotechnical Faculty, Food Science and Technology standardised reproductive and survival endpoints of water fleas (Daphnia magna ) after chronic applicability of these biomarkers in routine acute toxicity tests
Unbound MEDLINE/PubMed | Toxicity of Electronic Waste Leachates to water for 3 days at 23°C in concentrations of 25 g/l for metal components, 50 g/l for The water phase was tested for acute toxicity to Daphnia magna.
Keywords: Acute toxicity, chronic toxicity, Daphnia magna, pollutant, survival, reproduction. No: 63, 2007. 69 concentration of pollutant for D. magna (at 20°C
(pH= 2 - 3; ORP 1100 mV; Cac500 mg/l). The Anolyte Daphnia magna 24 hours acute toxicity tests were carried out according to Finnish standard SFS 5062.
%T The acute toxicity of industrial effluents to Daphnia magna : summary of 1987 testing / report prepared by D.G. Poirier and G.F. Westlake. %C [Toronto, Ont.] :
The acute toxicity of 21 parabens and their chlorinated derivatives was investigated by means of two toxicity bioassays: Daphnia magna immobilization test and
They were fed with alga Scenedesmus subspicatus. Chodat 1926 corresponding to 0.13 mg C/daphnia per day. Acute toxicity to daphnids (8) was evaluated
Stock solution was prepared by dissolving the toxicant in acetone, and the concentration was. I g/L. The stock solution was stocked at 4°C. 1 .3 Acute toxicity test
20 +1o. C, as recorded daily with a RN 527-60-6): Acute toxicity to Daphnia magna”, dated December 2002 Daphnia magna (Straus 1820)
We found the water flea Daphnia magna [5] a suitable candidate. This choice was made because daphnids are already used in acute and chronic toxicity testing
The aim of the study was to investigate the acute toxicity of carbofuran Keywords: carbofuran; Poecilia reticulata; Daphnia magna; Raphidocelis subcapitata; Sinapis alba; acute toxicity water solubility (0.32 g/l at 20°C) and minimal ad-
The acute aquatic toxicity tests with RME and REE were conducted with both rainbow benzenes and naphthalenes, with boiling points between 115 and 270°C. Summaries of the test conditions for the daphnids, daphnia magna, fathead
hazard associated with the acute toxicity of new and existing substances. These tests are expensive, time Keywords Interspecies correlation Mammalian toxicity Vibrio fischeri Daphnia c Springer Science+Business Media, LLC 2009. 85
Keywords: Pesticides; Methyl-tert-butyl ether (MTBE); Toxicity; Daphnia magna; Vibrio fischeri. 1. Introduction Acute and chronic toxicity of MTBE alone appears to be low . dried reagents and stored at Ā20 C. The cells were rehydrated prior
b) Acute toxicity in daphnia magna . c) Results of the ecotoxicological tests:. I .2.3.1 Tests A6 Water solubility, A8 Partition coefficient and C2 Acute toxicity to
Abstract -Ten 48-h static acute toxicity tests were conducted with Duphniu mugnu Straus and Duph- for Daphnia of 17°C; Buikema et al.
Acute Toxicity to Daphnia magna (Method C.2 of Commission Regulation ' Daphnia sp, Acute Immobilisation Test'). Sumitomo Chemical Co. Ltd., Osaka ( Japan).
Wan, M.T., G. Van Aggelen, W. Cheng and C. Buday. 2000. Validation of the acute toxicity of inorganic chloramines to the fresh water invertebrate Daphnia
Static acute toxicity tests using D. magna have been widely used for decades to estimate No tobacco was used in Experiment C. Daphnia were exposed to the
Short-term toxicity to algae (inhibition of the exponential growth rate). 3.3. Comment on endpoint: EU C.2, OECD TG 202, Acute toxicity for Daphnia (water flea) is
Acute toxicity was observed with 96LC50 for C(70) -gallic acid of 0.4 ± 0.1 mg/L C (70) . Daphnia magna fecundity was significantly reduced in
icant correlation of in vitro with in vivo acute toxicity in fish. (organotins, substituted phenols) and zooplankton Daphnia magna (pharmaceuticals) was found. . Chem. 15, 728-735. Caminada, D., Escher, C. and Fent, K. (2006). Cytotoxicity of
Substances causing acute toxicity to Daphnia magna (water flee) leached from one third of . Daphnia magna - Screening and Toxicity Identification Evaluation of different A dark plastic material may be as much as 60°C warmer than the
A rapid bioassay for detecting saxitoxins using a Daphnia acute toxicity test. water samples was caused by saxitoxins found in C. raciborskii.
I. Implementation of toxicity tests in international dredged Coastal waters ( HABAK 1999). • Saltwater test-set. Iba c on.de aqua sen Acute toxicity Daphnia
c University of Salerno, Department of Civil Engineering, 84084 Fisciano (SA), Keywords: Acute toxicity removal; Daphnia magna; Ozonation; Pre-oxidation;
2.5.1 Acute toxicity tests with the formulated product (Annex III point 10.2.1) .. 20 PEC at Step 2 and the C. riparius 48 h LC50 is less than 100, then long-term sediment
ACUTE TOXICITY OF THE HERBICIDE BROMOXYNIL. TO DAPHNIA MAGNA. KEVIN J. BuHL,"? STEVEN J. HAMILTON? and JAMES C. SCHMULBACHS. tU.
c Universit!e Claude Bernard Lyon 1, UMR/CNRS 5023, Ecologie des h and 30 -min acute toxicity tests using Daphnia magna and Vibrio fischeri, respectively)
carried out according to Annex V of the directive, i.e., acute toxicity for fish ( method C.1.), acute toxicity for Daphnia. (C.2.), and the algal growth inhibition test
c University of Nova Gorica, Laboratory for Environmental Research, P.O.B. The most commonly used toxicity test worldwide is the acute Daphnia magna test .
Acute toxicity to D. similis was detected in water and sediment samples from the das amostras de água e sedimento, para Daphnia magna e Daphnia similis, . Water and sediment were stored at 4 °C until initiating ecotoxicological assays.
Daphnia magna, a small aquatic crustacean, is considered a “keystone” species °C in a Percival environmental chamber according to standard protocols (11, 13). Acute and chronic toxicity assays were conducted using protocols similar to
TEST ITEM: GLP.CODE: Daphnia, Acute lmmobilization. LinevolT9. sDA-004r4- 20. - page 1144 -. Aliphatic Alcohols Gonsortium under Care Of (C/O) SDA
In this study the acute toxicity of lead nitrate (Pb(NO3)2) to Daphnia magna photocycle at 20.2 ± 1.3°C. The dissolved oxygen leves and
acute toxicity test with fish and Daphnia in which tained at 25 ą 2 °C, in 5-L borosilicate glass beakers tion (at 4 °C) in darkness until analysis, and bio-
Keywords - polycyclic aromatic hydrocarbons, phototoxicity, acute toxicity of PAH, anthracene, benzo(a)pyrene, PAH toxicity to Daphnia, bluegills, and algae. . approximate bands: UV-A, 390-315 nm, UV-B, 315-285 nm, UV-C, 285 nm and
LeBlanc, G.A. 1980. Acute toxicity of priority pollutants to water flea (Daphnia magna ). Bull. Environ. Contam. Toxicol. 24: 684-691. Lee, R.F., and C. Ryan. 1983
temperature, Daphnia magna. petroleum. coal oil, synthetic oil, respiration, food assimilation, acute toxicity, chronic tcxicity. ULLRICH, S. 0. JR., AND R. E.
acute toxicity test of chemicals is described here. using algae, Daphnia sp. or fish are intended for determining the toxicity of test . 24 °C, controlled at ± 2 °C.
b) Acute toxicity to daphnids. SIDS data: Daphnia magna. Results: 24-hours: EC50 = 3.7 mg/l c) Results of long-term tests e.g., reproduction. SIDS data: Daphnia
on crustacean cladoceran Daphnia magna. Time and. In acute toxicity experiments (at 23°C), the following temperature dependences were also taken into
Laboratory-cultured - juvenile Daphnia magna will be added to a serial dilution of concentration can be determined in a short term acute toxicity test. Results
Printed in Great Britain The Detection of Acute Toxicity with Daphnia magna D. G. A temperature of 21.1+0.05 C was found to be efficient to operate and to
Abstract;This study was conducted to evaluate the environmental safety of varius municipal solid wastes by acute toxicity test using Daphnia magna. Samples
The acute toxicity of tire wear for Daphnia magna was found to be < 40 the rubber to equilibrate with dilution water at 44 degrees C for 72 h.
Abstract. Acute toxicity tests were carried out with three metals on the marine copepods Scutellidium sp., Anderson (1950) found that Daphnia and other related freshwater Acclimation and toxicity tests were conducted at 1751°C. White
Daphnia magna is a useful aquatic organism for testing ecological toxicities of environmental . 1°C) prior to use during acute toxicity testing of D. magna.
samples were measured using 24 h newborn Daphnia magna. COD A 60% of acute toxicity, 92% of and 50% of total COD removal were obtained at .. Gottlieb , A., Shaw, C., Smith, C., Wheatley, A., Forsythe, S. (2003) The toxicity of textile
>1t/year, include acute toxicity to daphnids (OECD TG 202; Annex V C.2), growth inhibition in FIRST STEP: Toxicity testing with algae and daphnia. Daphnia
Initially, data from acute and chronic toxicity tests were gathered by exposing the invertebrate Daphnia magna to nanoparticles of carbon black, cerium dioxide The beakers were kept in a climate chamber that was set to 20°C. ±1°C and a
AND DAPHNIA PULEX. 1.0. SCOPE AND APPLICATION. The procedure for conducting a 48-hour (hr) acute toxicity test using Daphnia magna or Daphnia pulex
Herbicidal triazines: acute toxicity on Daphnia, fish, and plants and analysis of i.e., Cl, SCH3, or OCH3, at the carbon atom C-2, and (ii) the number and size of
and the waterflea Daphnia magna) have been exposed to increasing For the brackish water rotifer B. plicatilis the acute toxicity of potassium dichromate . vironmental conditions (20°C, 35°/oo, continuous illumination of 4000 lux and gentle
Acute Toxicity Test Methods Daphnia magna NPDES Thomas More 3.2 Moderately Hard Reconstituted Water Prep for C. Dubia SOP No. 228
Acute toxicity of dimethoate to Daphnia magna (24 hours OECD mobility R. Bathe, 1982: Acute toxicity to rainbow trout of Dimethoate. 23300 at pH 5, 20°C
establishment of Daphnia galeata Sars, and the detection of an extremely low clonal diversity of Lake Orta population, we carried We conducted acute toxicity tests to estimate the EC50 . photoperiod were kept constant at 20 ± 1 °C, and 12
C, random place ment of test organisms into test vessels, and exposure of 20 or of test polymers and results of acute toxicity tests with Daphnia pulex and
Comparison of Ethanol Toxicity to Daphnia magna and. Ceriodaphnia dubia Tested at Two Different. Temperatures: Static Acute Toxicity Test Results
Reduced notification dossier required: Annex VII C. Full notification acute Daphnia acute fish bacterial inhibition adsorption/desorption hydrolisis biodegradation o Summary info, including: origin, use, tonnage, ID, physchem., tox., eco-tox.
C. Toxicology & Pharmacology 133(1): 243-258, details; Peer reviewed article The acute toxicity of nickel to Daphnia magna: Predictive capacity of
The effects of microcystins on Daphnia galeata, a typical filter-feeding grazer in (24) found no correlation between acute toxicity of various M. aeruginosa strains For 14C-labelling, a NaH14CO3 solution (0.18 MBq per 50 ml) was added to
Keywords: acute toxicity, Daphnia magna, gamma rays, radiation treatment, titanium used after filtration using a 0.45 μm GF/C filter (Advantec MFS, USA).
LIST OF METHODS FOR THE DETERMINATION OF ECOTOXICITY. C.1. Acute toxicity for fish. C.2. Daphnia sp. Acute immobilisation test. C.3. Algal inhibition
acute and chronic effects of some UV-filters on Daphnia magna (Fent et . (2001) report- ed that its acute toxicity is 102 mg/l for C. dubia (48-hr
Influence of suspended solids on acute toxicity of carbofuran to Daphnia magna: II. An evaluation of potential interactive mechanisms. Authors:
I. Structure-toxicity correlations of phenolic compounds to Daphnia magna. 12 6 1974 Dec Acute toxicity of various metals to freshwater zooplankton. When the above pesticides were tested against the larvae of C. pipiens, the LC50 values
Acute toxicity tests (48h) with Daphnia similis were also performed with the samples. The level . water samples were kept refrigerated at 4°C for 24h until the
The minimum concentration that did not show any toxicity to Daphnia similis was 2.5 mg of chromium Keywords:Water Pollution, Chromium (III), Daphnia similis, Acute Toxicity Test .. [5] C. Fleury, A. Petit, F. Mwale, A. Antoniou, D. J. Zukor,
Algae Growth Inhibition Test (TG 201), Daphnia Acute The dry chemical becomes explosive above 105°C and when subjected to impact or friction. The acute oral toxicity of benzoyl peroxide is very low: LD50 >2000 mg/kg bw in mice, and
effort were to: 1) compile and organize an extensive body of acute toxicity data, 2) characterize the .. and C (rainbow trout, bluegill, daphnia, and fathead min-
Annex C. Calculated Sprayed area (1000 ha) using standard dosage levels. . Toxicity. Daphnia 21day NOEC 54 Annex O. Example of random selection of input data of acute fish toxicity.
c Division of Environmental and Occupational Health, School of Public Health, acute and chronic toxicity tests. on cadmium toxicity to Daphnia magna.
b Acute daphnia toxicity is representative of relative toxicity to aquatic invertebrates. The tests were carried out in boiled tap water (20 C, pH 7 - 8, calcium
An acute toxicity test was adapted to observe the effects of Daphnia sp. and Moina sp. when In each chamber, 1mg C of Desmodesmus was injected daily.
Acute toxicity of oxygenated and nonoxygenated imidazolium-based ionic liquids to Daphnia magna and Vibrio fischeri. Samorì C, Pasteris A, Galletti P,
Acute toxicity bioassays were performed using the test organism Daphnia similis, while chronic bioassays were carried out with Ceriodaphnia
The acute and chronic toxicity of monocrotophos (MCP), the binary joint toxicity of benzene sulfonate (SDBS) to Daphnia magna (D. magna) was evaluated. . C in. OECD M4 culture medium[29] under a 16:8-h light:dark photoperiod at a
Acute toxicity of silver nano particles estimated in Daphnia magna. Concentration (μg/L). 0 Caenorhabditis elegans, comparing the toxicity of AgNPs and Ag
significant relationship does exist between acute selenate toxicity and ambient sulfate concentrations. Data from bioconcentration in Chironomus decorus and Daphnia magna. . (WA, USA) conducted testing on C. dubia and P. promelas.
This study examined the interactions between Daphnia magna and a Acute toxicity was observed . cups containing 50 mL test solutions at 25 ( 1 °C. Five replicates were early observations during the acute toxicity test was the formation
The effects of UV radiation on the acute toxicity of retene (7-isopropyl-1- methylphenanthrene) to Daphnia magna Straus were studied.
Ceriodaphnia dubia; Daphnia magna; Daphnia pulex. Fish. Pimephales Methods for Measuring the Acute Toxicity of Effluents to Freshwater and Marine Organisms. 5th Edition, USEPA Minimum of 15 young (average) for control C. dubia
S-F Analytical Laboratories conducted acute toxicity tests on laboratory water Ceriodapiinia dirbia, Daphnia magma, and fathead minnows were used as . 12 months on the appropriate test organisms are summarized in Appendix C.
Daphnia magna bioassays to test acute toxicity of methyl parathion solutions treated . continuous illumination (11000 lux) at 20-22 °C. 2 h prior to the test, the
(EU, 2004). R0007 n-alkylbenzenesulfonic acid and its salts (alkyl. C=10-14) . ( 2001) Acute toxicity to water fleas (Daphnia magna), under static renewal
C. dubia was more sensitive than D. magna, both in the acute toxicity tests and to the . Daphnia magna and C. dubia were cultured in reconstituted hard water
As a result, lower case “c”, formerly only interpreted as sp. 2 carbon, is now . Modeling the acute toxicity of chemicals to Daphnia magna: a probabilistic neural
Part C: Methods for the determination of ecotoxicity. C.1 ACUTE TOXICITY FOR FISH. C.2 ACUTE TOXICITY FOR DAPHNIA. C.3 ALGAL INHIBITION TEST
(C)-. Companyz Marrone Bio innovations. Signature: Company Agent: Keith Pitts. Title: VP ACUTE TOXICITY NON-TARGET TRIALS WITH DAPHNIA MAGNA
Seventh amendment of Directive 67/548/EEC Annex V. Part C: Methods for the determination of ecotoxicity. C2: Acute toxicity for Daphnia. J. O. No. L154
CH 2 -COOH CH2=C-COOH. RECOMMENDATION OF THE
This Test Guideline describes an acute toxicity test to assess effects of chemicals towards daphnids (usually Daphnia magna Staus). Young daphnids, aged less
n ia. Available Guidelines. Commission Directive 92/69/EEC, Annex Part C,. C2: „ Acute Toxicity for Daphnia“, Official. Journal of the European Communities No.
The scarce information available until now consists mainly of acute toxicity data. (c) gain insight in the disruption of endocrine mediated effects by toxic
Herbrandson, C., Bradbury, S.P., Swackhamer, D.L., 2003. Influence of suspended solids on acute toxicity of carbo- furan to Daphnia magna II. An evaluation of
UV-B-Induced Acute Toxicity of Pyrene to the Waterflea Daphnia magna . C. Steinberg and U. Muenster, Geochemistry and ecological role of
ans Daphnia magna (a reference test organism) and Ceriodaphnia dubia (a C. dubia was more sensitive than D. magna, both in the acute toxicity tests and
Acute toxicity of chemicals to Daphnia magna in humic waters in the dark at 4 C until used for three types of experiments: Experiment 1 Effects of a distinctly
B = Metformin, C = Metoprolol, TU = Toxic Unit, tested with Daphnia The first part of this study investigates the acute toxicity of these four
Acute and chronic toxicity testing with Daphnia sp. In: Blaise C. and Férard J.-F. ( eds.), Small-scale Toxicity Testing for freshwater Environments
EC Directive 92/69/EEC C.1 Acute Toxicity for Fish. EC Directive 92/69/EEC C.2 Acute Toxicity for Daphnia. EC Directive 92/69/EEC C.3 Algal Inhibition Test
-14°C. Boiling point. 188°C. Vapor pressure. 0,6 torr at 25°C. Specific gravity Daphnia sp. are extensively used to investigate the acute and chronic toxicity of
Toxicity of an engineered nanoparticle (fullerene, C60) in two aquatic species, The current study investigates differences in acute toxicity to Daphnia magna
The toxicity of contaminated Old O-Field (Edgewood Area of Aberdeen Proving Ground) of 48-h definitive acute toxicity tests run with daphnid neonates ( Daphnia magna) and juvenile fathead Contract Number: N00039-89-C-0001
EC (L383) C.3 Daphnia acute toxicity: EC50 = 80 mg/L NOEC = 32 mg/L Daphnia magna,. 48h, 92/69/EC (L383) C.2 Daphnia reproduction test: NOEC = 5.6
Single species toxicity testing. Daphnia 45-h Acute Toxicity Test C. dubia. 25 ± 1. 20 ± 2. Temperature (°C). reproduction. Immobilization. Endpoint. < 24 h old
western Finland and maintained in the laboratory at 16°C. For the experiment, Its acute toxicity to D.pulex has been previously demonstrated in our laboratory
Comparative Biochemistry and Physiology, Part C , Volume 137
Acute toxicity studies with Daphnia magna suggest that the 48 h EC50 ( immobilisation) is (C) 2007 Elsevier Ireland Ltd. All rights reserved.
Application to acute copper toxicity in freshwater fish and Daphnia. Auteur(s) / Author(s). SANTORE Robert C. (1) ; DI TORO Dominic M. (2 3) ; PAQUIN Paul R.
Acute toxicity of ILs (48-h median lethal concentration. [LC50] value [14]) was assessed the chronic toxicity of ILs to Daphnia first-brood neonates, total number of .. D. Lodge, C. Kulpa, R. Gillespie, and P. Landrum. Funding was provided
Acceptability of Acute Toxicity Test Results . .. C. Dilutor Systems . . Summary of test conditions and test acceptability criteria for Daphnia pulex and. D. magna
least six months at temperatures below 4 °C. Advises for no autoignition up to 400 °C. Oxidizing acute toxicity / daphnia: > 100 mg/L, 48h (OECD 202)
This study addressed the substitution of C. dubia with Daphnia ambigua for toxicity Acute toxicity tests showed that D. ambigua was less sensitive to some
Acute toxicity for Daphnia. 92/69/EEC. L 383 A 1992 17th. C.3. Algal inhibition test. 92/69/EEC. L 383 A 1992 17th. C.4 A to F. Biodegradation
All acute toxicity data developed by the Columbia National Fisheries 100% of the time; and (2) testing of three species (Daphnia, Gammarus, and rainbow 10 °C rise in temperature, but the factor for organophosphate insecticides was
Acute toxicity value Crustacea 48h, LC50mg/l. Acute toxicity value Algae 96 or 72h, EC50mg/l. C1. Carp 20. Daphnia 19. C2. Rainbow trout 4.58. Daphnia 6.9. C
1 Physicochemical effects 5 Toxicokinetics 4.1 Acute inhalation toicity 4.18.c toxicity to Daphnia (immobilisation) 3.2 Short-term toxicity to algae (inhibition of the
Respirometric acute toxicity screening assay using Daphnia magna c Shannon Aquatic Toxicity Laboratory, Enterprise Ireland, Shannon, Co Clare, Ireland
Acute toxicity of furazolidone on Artemia salina, Daphnia magna, and Culex pipiens molestus larvae. by A Macrì, A V Stazi, G Dojmi Di Delupis. Biological
Keywords—Poly- and perfluorinated compounds, Aquatic toxicity, Daphnia . The 48-h acute immobilization tests with C. sphaericus followed the protocol of the
Water pollution, Chromium (III), Daphnia similis, Acute toxicity test [5], C. Fleury, A. Petit, F. Mwale, A. Antoniou, D. J. Zukor, M. Tabrizian and O. L. Huk, “Effect
Effect of hardness on acute toxicity of metal mixtures using Daphnia magna: Prediction of acid . C in a temperature controlled room, maintained with a 16 h light
comprised acute toxicity assays using as test organisms Daphnia Similis, seeds of . C r. +6. Cr. +6. 2000 mg/L. 3000 mg/L. Phenol. June. May. A pril. Phenol
Daphnia magna were exposed to the four solutions using U.S. Environmental Protection Agency 48-h acute toxicity tests. Images of the particle solutions were
C (60?F) for 825 hours. Long term bioassays with warm water fish and freshwater Daphnids {Daphnia magna) used for acute and chronic toxicity experiments
Determined by Daphnia magna, Raphidocelis subcapitata, and Photobacterium phosphoreum Abstract. Acute toxicity of four relatively new chelating agents
The water flea Daphnia magna straus is the most commonly used zooplankton in toxicological tests. The objective of this study The acute toxicity tests were determined using Daphnia magna. . C: After primary sedimentation. Table 1 also
Acute toxicity: 96 hr LC50 (for fish). < 1 mg/L, or 48 hr EC50 (for daphnia). < 1 mg/ L, or 72 hr IC50 (for classified in Category A, B or C, or no acute toxicity and
C.19 / 2.6 Organic carbon-sorption partition coefficient Koc C.2 / 3.2 Acute Toxicity for Daphnia C.1 / 3.3 Acute toxicity for fish (Danio rerio) C.1 / 3.3 Acute toxicity
The following are the acute and chronic toxicity test results on iron obtained from Based on the comparison of two LC50 values listed above for Daphnia and the options available, it .. An A~C Ratio of 10.64 obtained fiom the FHM Growth
Among aquatic organisms, Daphnia magna has been used extensively in acute toxicity or reproductive toxicity tests. Although these types of tests can . Cultures of 20 individuals/L were incubated at 24 ± 1°C with a photoperiod of 14 h
Title;Acute Toxicity Responses of Two Crustaceans, Americamysis bahia and Daphnia magna, to Endocrine Disrupters. Author; HIRANO M (Prefectural Univ.
It may be concluded that the acute toxicity test using C. laevis may be a suitable Daphnia, amphipods, and standard fish species like rain-
1 Oncorhynchus mykiss1 conditions 11 OECD Guideline 203 Acute Toxicity 24 EEC Directive 92/69, EC50 40 mg/L Daphnia magna2 and 28 h 12 Annex V, C. .
Acute Toxicity Tests with the Tropical Cladoceran Pseudosida ramosa: The and was less sensitive compared to Ceriodaphnia dubia and C. silvestrii ( Neotropical species), The acute toxicity of metals to Daphnia similis was determined and
Acute toxicity of four heavy metals (Hg, Cd, Zn and Pb) to the fish food organisms, viz.Daphniasp. and Daphnia and Cypris were cultured in dechlori- nated water TABLE I. Physiochemical characteristic of dilution water. Temp. 30°C ph. 8.5
c REQUIMTE, Departamento de Toxicologia da Faculdade de Farmácia da Universidade do Porto, .. included varied species of crustaceans, such as Daphnia magna, B1 when simultaneously using the acute screening toxicity assay. 456
detected in diluted Anolyte after the heating at 100o C for 5 minutes to Daphnia magna 24 hours acute toxicity tests were carried out according to Finnish
KOZLOVA Tatiana (1 2) ; WOOD Chris M. (1) ; MCGEER James C. (2 3) ; of water chemistry parameters on the acute toxicity of waterborne Ni to Daphnia pulex
Acute Toxicity Study on Daphnia magna - Mortality over 48 hour exposure to toxicant. rWhere mortality has Water Temperature - (C)JJ. 50.00%. 0/TiQ. OP. Oil,
Fractal analysis of Daphnia motion for acute toxicity bioassay. Shimizu N, Ogino C, Kawanishi T, Hayashi Y. Department of Chemistry and Chemical Engineering
decreases, and the amount of -C-(CH3)3 groups increases, reducing the . Acute toxicity tests were performed on Daphnia magna neonates that were less than
Acute aquatic toxicity to fish, daphnia, algae. ● Terrestrial Acute toxicity to aquatic species .. C - agglomerated nanoparticles into micron sized particles
Application to acute copper toxicity in freshwater fish and Daphnia.
cubic foot - Solubility: 1.0 to 1.5% in water at 25 degrees C - Dissociation constant: Acute dermal toxicity (rabbit): > 2000 mg/kg, Toxicity Category III . invertebrate toxicity (Daphnia magna): > 100 mg/l - Avian acute oral toxicity ( bobwhite
acids is achieved with the aid of the medium term Daphnia magna test. .. (1984) . 5. C. BELLAVERE and J. GORBI, "A Comparative Analysis of Acute Toxicity
Daphnia magna acute toxicity test. 1. The test is based on observation of daphnia immobilisation in different dark at optimum temperature of 20-25 °C. Fig.
of the C. riparius and G. pulex bioassays for assessing tox- icity and determining .. times greater) to neonate Daphnia magna Straus (96 h LC50 of 0.16 mg/L
3 Feb 2011 and endpoints such as acute toxicity, mutagenicity, carcinogenicity, eye .. Acute Toxicity for Daphnia C.2; Acute toxicity for fish C.1; Acute
Bioassay tests showed that phenol was toxic to Daphnia magna and so resulted in quite low LC50 indication of acute toxicity reduction resulting from treatment. kept constant at 32 ± 2 °C using cold water circulation around the beaker.
Daphnia magna acute lethality toxicity test protocol. Queen's Printer ITJ k> iJ U IJU OJ c • • U ~ C a 0) C 4J ■H i; n U 10 3 ti 10 U U O 01 o. ^ OJ 0. n iJ U-l 4J
Standard Protocol for Measuring the Acute Toxicity of Effluents to Daphnia Pulex and .. dates and times - Collection method - Physical and chemical data c.
Method: Directive 841449/EEC, C.2 "Acute Toxicity for Daphnia" (1998). Test substance: Cyclohexanol (C6H1 lo), produced at BASF AG in Ludwigshafen ( batch
C.20 REPRODUKTIONSTEST PÅ DAPHNIA MAGNA. Last Update: Acute toxicity to Daphnia magna. Akut toxicitet för . acute toxicity for daphnia (5.1.2).
Effects of suspended solids on the acute toxicity of zinc to Daphnia magna and Mottaleb, C Kevin Chambliss, Bryan W Brooks in Environmental Toxicology
von Elert, E. et al., Gorr, T.A. et al., Heugens, E.H. et al., Gourlay, C. et al., . DGT was used in parallel with the Daphnia magna acute toxicity test in order to
Applied Polymer Systems, Inc. Acute Toxicity Testing on 704F Product,. October 5 -7, 2001 Test results indicated no acute mortality to Daphnia magna in the 704F polymer test data/reference toxicant data (Appendix C). LAW appreciates
Daphnia magna is a freshwater microcrustacean which is often used for acute and chronic toxicity testing in aquatic ecotoxicology. possible to use acute toxicity tests with daphnids to regime of 16/8 h and temperature of 20±1 °C for 24
of acute and chronic toxicity to Daphnia magna in standard laboratory toxicity
determining the acute toxicity of whole effluents to the freshwater cladoceran .. Summary of recommended test conditions for the 48-h C. dubia acute toxicity
Acute toxicity tests with aquatic invertebrates where a value could be .. LC50s for fathead minnow, Daphnia magna, D. pulex, and C. dubia at 10 802, 4213,
ABSTRACT: Daphnia magna was used as a test organism for assessing the toxicity remaining The acute toxicity response observed in D. magna, indicates that zinc has an antagonistic Chlorella ¨ulgaris IAM C-30 , obtained from the Insti-
Milene C Silva. More choices ▾ Acute toxicity test with Daphnia magna: an alternative to mammals in the prescreening of chemical toxicity? . Ecotoxicol
spectrometry and acute toxicity evaluation for ß-blockers and a Department of Environmental Chemistry IIQAB-CSIC, c/Jordi, Girona 18-26, 08034 Lipid- regulating agents; Environmental analysis; Toxicity; Daphnia magna; ß-Blockers. 1.
Jump to:navigation, search. EU C.2, OECD TG 202, Acute toxicity for Daphnia ( water flea) is expressed as the median effective concentration
A rapid bioassay for detecting saxitoxins using a Daphnia acute toxicity test. by: Aloysio Ferrão-Filho, Maria C. Soares, Valéria F. de Magalhães
Herbicidal triazines: acute toxicity on Daphnia, fish, and plants and analysis of its groups at the aminic nitrogen atoms bound to the ring carbons C-4 and C-6.
Describes a method for the determination of the acute toxicity to Daphnia magna on growth, fertility and reproduction of Caenorhabditis elegans (Nematoda)
Key words: Acute and chronic toxicity, Daphnia magna, waste stabilization pond, kept at a temperature 22± 2°C with a light period of 16 L: 8 D both during
C.2. ACUTE TOXICITY FOR DAPHNIA. 1. METHOD. 1.1. INTRODUCTION. The purpose of this test is to determine the median effective concentration for
Acute toxicity of pharmaceutical and personal care products on
OECD No 201/EU C.3. ISO 8692: Daphnia magna, acute immobilization test. OECD No Sediment - water chironomid toxicity test using spiked sediment
Contains details of Influence hardness acute toxicity metal mixtures Daphnia magna C. Specific growth rates in dry wt per day were 2.4% at 2.degree.
Title: Acute toxicity of aluminum on Daphnia magna in waters of different total hardness levels. URL: Retrieve Description: Satizabal, C.-Alexandra; Andrade,
The individual effect of different major cations (Ca2+, Mg2+, Na+, K+, and H+) on the acute toxicity of zinc to the waterflea Daphnia magna was investigated.
TRIMETHYLPHENOLS TO DAPHNIA MAGNA STRAUS 1820. JAMES DEVILLERS groups on the phenol nucleus and their acute toxicity to the water flea. 22 + I°C under a photoperiod of 16 h daylight/8 h darkness. The Daphnids were
Seventh amendment of Directive 67/548/EEC, Annex V. Part C: Methods for the Determination of Ecotoxicity. C2: Acute Toxicity for Daphnia. J.O. No. 154
Indeed, one to three times decreased acute sensitivities to toxicants the chronic toxicity of metal exposure to Daphnia, but could 0.07 mg C Daphnid. −1 day
sensitive organisms to heavy metals. The acute and chronic toxicity of five metal ions, Hg, Cd,. Cu, Pb and Cr, in single or mixture using Daphnia magna was
L:8 h D and the temperature was 20$13C. Acute Daphnia toxicity tests. All experiments were car- ried out with animals from clone A (Baird et al.
Appendix 1: Test methods of Daphnia magna acute toxicity tests. . 3 days prior to the start of the toxicity test at 22o C, under continuous illumination of at least
acute toxicity of pentachlorophenol to Simocephalus vetulus. (Schoedler, 1858) 140 and 199 u.g H at 22°C and 16°C, respectively, and for those exposed to pure PCP inhibition test, and the Daphnia magna 24-h immobilisation test. These
A Biotic Ligand Model Predicting Acute Copper Toxicity for Daphnia . in the test cups at 20 °C for 1 day before being used in the toxicity tests.
Both the acute toxicity and uptake of Cd were reduced by higher Ca The stocks of Daphnia magna were cultured in GF/C (Whatman) filtered
Acute toxicity of furazolidone onArtemia salina, Daphnia magna, . The test lasted 24 hr at 21 C, with an alternated photoperiod of L/D = 14/10
By: Gillis, P.L.; Acute toxicity of trivalent thallium compounds to Daphnia magna. By: Lan, C.H.; Influence of metal complex By: Barata, C. NAL Home | USDA
Acute toxicity for Daphnia magna, methods EU C.2, OECD. 202; USA OPPTS 850.1010. Algal growth inhibition test, methods EU C.3,. OECD 201; USA OPPTS
【Key Words】： daphnia magna nano-ZnO acute toxicity 【Fund】： 123000,China );Surface Modification of Nano-ZnO by Titanate Coupling Agent[A];[C];2007
an acute toxicity test in which daphnids (Daphnia magna or D. pulex) are exposed to a . (C) Stock daphnids may be tested periodically to determine any ge-
between acute and chronic toxicity is considered to be inde- . The species tested were the cladocerans Daphnia magna and .. Schäfers C, Nagel R. 1991.
A standard method for the algal growth inhibition test, Daphnia acute immobilization test or fish acute toxicity test of chemical substances is described here. II. . Temperature: Within the range of 21°C - 24°C, with a variation within the
3.2 Acute Toxicity to Aquatic Invertebrates (e.g. Daphnia). Robust Summary 14 - Daph C; Dissolved oxygen: 8.9-9.1 mg/L; pH: 7.9. 8.2; Total
We investigated the variations of acute toxicity of mercury (Hg) in Daphnia magna under different temperatures, population origins, body sizes,
Mortality of C. dubia exposed for 48 hours to several concentrations of. BDE-47 in the range-finding static renewal acute toxicity test. .…. 47 . was acutely toxic to the freshwater cladoceran, Daphnia magna (Evandri et al. 2003).
For mortality studies, Daphnia were exposed to the nanoparticle suspensions using U.S. EPA acute toxicity tests. Exposure to nano-C60 and filtered TiO2
Influence of suspended solids on acute toxicity of carbofuran to Daphnia magna: I . Interactive effects. Authors: Herbrandson C.; Bradbury S.P.;
The present study was designed to assess the acute toxicity of paraquat dichloride to Daphnia magna in three different exposure systems
ranging from 112 to 518 in zooplankton (Daphnia magna) exposed for Definitive acute toxicity data for vertebrates were .. c/o Manitoba Statutory Publications
Based on the acute toxicity test results using Daphnia magna the . of 20 C. The heterotrophic mass used in the activated sludge inhibition test was fed with
A test was carried out at 22°C, over 96h. lC50 was calculated using the log-probit method [19]. Acute toxicity test with crustacean Daphnia magna was performed
2010: Matthew Clifford; James C McGeer. Development of a biotic ligand model to predict the acute toxicity of cadmium to Daphnia pulex. Aquatic toxicology
3:Acute Toxicity Testing with Daphnia magna. Available Guidelines. Commission Regulation 440/2008/EC, C.2, 2008. EPA Ecological Effects Test Guideline
The test temperature should be between 18 and 22°C, and for each single test it . in Daphnia are determined to be used as indications of the toxicity of a
Aquatic toxicity of textile dyes and textile and dye industrial effluents were evaluated in an acute toxicity study using Daphnia magna as an aquatic experimental
(Memorandum to C. Stephan, USEPA, Duluth, MN, July 20.) (Cited from . Acute and chronic toxicity of sodium selenate to Daphnia magna Straus. Environ.
SUMMARY. At the request of APME, Brussels, Belgium, the acute toxicity of the test item AMMONIUM (APFO) was evaluated in the Cladoceran, Daphnia magna 4th April 1984) and Commission Directive 92/69/EEC (C.2, 31st July 1992).
evaluate the acute toxicity of effluents from different units of Isfahan Wastewater Treatment Plant. (IWTP). The samples were Keywords: Acute toxicity, Daphnia magna, Wastewater . C: After primary sedimentation. Table 1
Description: Daphnia magna neonates were exposed to solutions of carbon nanotubes and humic acid to determine the acute toxicity of carbon nanotubes in
Toxicity Tests. Acute Toxicity Tests at 10-35 °C. Acute toxicity tests were performed in accordance with standard protocols (10), except where noted. Test animals
The third family termed, c, is reserved for crustacean MTs that are different from these [87], controlled for maternal effects in acute toxicity tests, demographic
Acute toxicity of inorganic selenium to Daphnia magna (Straus) and the effect of sub-acute exposure upon growth and reproduction. by Michael C Newman,
c AstraZeneca Global Safety Health and Environment, Brixham Environmental Laboratory, TQ5 8BA, . inhibition test, acute toxicity for daphnia and acute tox-
Toxicity evaluation is an important parameter in wastewater quality Keywords: Acute toxicity, Daphnia magna, Wastewater . C: After primary sedimentation
Altogether 26 plastic products were leached in deionized water (3 days at 50° C), and the water phases were tested for acute toxicity to Daphnia magna.
The acute toxicity of four different nanosized particulate materials (titanium dioxide, boron nanoparticles acute toxicity test with Daphnia magna. It has been .. Doshi, R.; W. Braida, C. Christodoulatos, M. Wazne, and G. O'Connor ( 2008).
Acute Toxicity of DDVP (Dichlorvos) on Daphnia magmr Straus, 1820. 'Scrap Saler and acclimated at under 20°C under 14/10 light/dark cycle. Daphnids were
Fish Acute Toxicity Test: The number of animals can be reduced . c) slope steep , spacing factor big, no partial mortality, only 0 and 100% mortalities (limit test) at the lowest EC50-value of existing algae or daphnia toxicity data, set as
(BSAFs) were 0.08 for Daphnia magna and. Chironomus ecosystems was investigated in the present study for acute toxicity. at 24±1°C by using heaters.
Appendix C-T1. Direct pore-water sampling toxicity tests may be conducted using standard methods (e.g., Daphnia acute toxicity testing). References: USEPA
The acute toxicity of dissolved ozone was determined for fish larvae of three idus (at 27 degrees C) and Clarias gariepinus (at 32 degrees C)] and to Daphnia
Daphnia exilis Herrick, 1895 (Crustacea: Cladocera): A zooplankter potentially as test organism for acute toxicity tests in tropical and subtropical environments. at 20 and 25 °C. The 48-h median lethal concentration (LC50) was 0.1170
substance using the test of acute toxicity on Daphnia magna. The results show an A test of toxicity on Daphnia magna is suggested to evaluate the efficiency of the Hard fresh water. Daphnia magna. Diazinon. C (mg/l). Parameter. Time (h)
The effects of microcystins on Daphnia galeata, a typical filter-feeding grazer in eutrophic tween acute toxicity of various M. aeruginosa strains to daphnids at 20°C. The densities of the Microcystis suspensions were measured by using a
Applied Polymer Systems, Inc. Acute Toxicity Testing, October 3-18, 2000. Dear Mr. mortality to Daphnia magna in the 702AA, 702B, 702C, 705, 730B, or the 740 polymer samples. Since test data/reference toxicant data (Appendix C).
The objective of the acute toxicity testing program is to evaluate alternatives to rainbow trout (Oncorhynchus mikiss) and Daphnia magna acute toxicity testing methods both Blaise C., Van Coillie R., Bermingham N. and Coulombe G. ( 1987)
Daphnia magna , EC50 value , LC50 value , SiO2 , acute toxicity when exposed to nanoparticle suspensions (titanium dioxide, nano-C
Chronic toxicity of NTA. (nitrilotriacetate) and metal-NTA complexes to Daphnia magna. J. Fish. Sturm and Payne (1973) reported that acute toxicity varied with water 8-10 days at 18 C, the test temperature) in 250-rnl beakers containing
Biotic Ligand Model of the Acute Toxicity of Metals, 2. Application to acute copper toxicity in Freshwater Fish and Daphnia. By: Robert C.
The rationale of this work is to employ an acute toxicity test with daphnia as a first broad was then immersed in an ultrasonic bath under reflux at 60°C for 2 h.
Keywords: Direct dyes; Aquatic toxicity; Daphnia magna; Genotoxicity; Copper complex . experimental solutions were maintained at 20 C under a
Shaw JR, Wood CM., Birge WJ, Hogstrand C. 1998. Toxicity of Acute and chronic physiological effects Acute toxicity of arsenic to Daphnia
c Department of Biology and Chemistry, City University of Hong Kong, Kowloon, SAR, Hong Kong, China . Acute toxicity test conditions (48 h) conformed to the
the acute and chronic toxicity of one REE, lanthanum (La), to Daphnia carinata. The 48-h EC50 of . at 20°C Æ 2, with a 12-h light/12-h dark photo-period and
Mercury biomagnification and stable isotope δ13C and δ15N signatures in . Acute toxicity of cadmium in Daphnia magna under different calcium and pH
The toxicity of soil leachate was tested using Daphnia Magna, a representative le 3: A selection of recent M. S. 3 studies. C o n ta m in a n t. T est O rga n ism. E n d
(ASA) has been evaluated using acute Daphnia and algal tests. Toxicities Mixture toxicity of the compounds could be accurately predicted using the concept of concentration . 2071 C and photoperiods of 16h light/8h dark. (B20 μEs¿1
Acute toxicity bioassays using Daphnia magna Straus (Cladocera, A: jugo de alfalfa (0250 gr/mL), medio B: levadura fresca disuelta y medio C: jugo de alfalfa
Keywords: Acute toxicity, Daphnia magna, Fastac log 1+[C] m o rtality. ,probit units. Fig. 1. Dependence of Daphnia magma mortality in probit units on Factac
equipment applying a 2º C min-1 ramp up to 1200ºC. 2.2. MWCNT functionalization Daphnia acute toxicity test. Daphnia magna neonates
2 C. Current practices of waste water control in the Baltic Sea region . .. Daphnia magna 24h (48h) immobility test for determining acute toxicity.
Toxicity values of pharmaceuticals to Daphnia magna in 48-h acute and 21-d c Classified in European Union Directive 93/67/EEC (European Economic
Attempts have also been made to relate the toxicity of Daphnia to other . LO~ ~ XPERIH~NTAL ACUTE )C-:DI&~ LETNAL CO'CENT 1[O~-48 hou - Figure 2.
acute toxicity and the reproductive responses were examined for chronic toxicity. .. c. Figure 5. Brood sizes of Daphnia magna exposed to sediment river
TO ACUTE COPPER TOXICITY IN FRESHWATER FISH AND DAPHNIA. ROBERT C. SANTORE,*† DOMINIC M. DI TORO,‡§ PAUL R. PAQUIN,§ HERBERT E.
With this aim, Daphnia magna individuals of different age were exposed to hexavalent chromium, sensitivity recorded in the acute toxicity bioassays was obtained with . reduced cytochrome c, and 1 mM EDTA dissolved in 20 mM sodium
toxicity. As was expected, acute C. dubia median lethal concentrations as Daphnia magna); chronic toxicity was less dependent on hardness than was acute
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