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RATL: A Database of Reptile and Amphibian Toxicology Literature

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Table 5 - FETAX Studies - 12<br />

Contaminant a Contaminant<br />

b<br />

Concentration<br />

b<br />

LC50 EC50 b<br />

TI d<br />

MCIG d<br />

NOEL d<br />

LOEL d<br />

Effects/Notes de<br />

Reference k<br />

isoniazid 251.0-285<br />

At malformation inducing conc. levels: Dawson <strong>and</strong> Wilke 1991a<br />

mg/L<br />

isoniazid:semicarbazide= conc. addition<br />

(tested<br />

occurred (TU=1.0). isoniazid:6-<br />

alone)<br />

aminonicotinamide <strong>and</strong> isoniazid:retinoic<br />

acid = additive response (TU>1.0).<br />

isoniazid Ratios <strong>of</strong> measured <strong>and</strong> calculated model<br />

parameters <strong>and</strong> median conc. ranged from<br />

0.72 - 1.44 with an average <strong>of</strong> 0.99.<br />

Shirazi <strong>and</strong> Dawson 1991<br />

isoniazid 7.86 0.24 32.8 1.18 Bantle et al. 1994a<br />

isoniazid 9750-<br />

9850<br />

240-280 35-41 80-150 Dawson et al. 1989<br />

isoniazid decreased unaffected Isoniazid-MAS decreased teratogenic Fort <strong>and</strong> Bantle 1990a<br />

1.6 fold<br />

index 96h LC50/96hEC50<br />

(malformation) nearly 1.8 fold.<br />

isoniazid 57.2-550 mg/L 4.23 (3.1-<br />

Mixed (3:1, 1:1, 1:3) with ß-<br />

Dawson <strong>and</strong> Wilke 1991b<br />

5.2) mL *<br />

aminopropionitrile the LC50s were 4.06<br />

(3.4-4.7)*, 4.23 (3.9-4.6)*, 4.16 (3.9-<br />

4.5)*. Mixture TUs for the same ratios<br />

were 0.97, 1.01 <strong>and</strong> 1.00, respectively.<br />

(<strong>of</strong> a total exposure volume <strong>of</strong> 10 ml at<br />

550 mg/L).<br />

isovalerianic acid 0-880 mg/L 575.3<br />

EC50 in mixture: 56.7 (52.8-60.5) TU in Dawson 1991<br />

(484.0-<br />

mixture for malformation: 0.099 (0.092-<br />

682.0)<br />

0.105).<br />

malaoxon 0.9 (0.7- mean TI (P):<br />

10-fold more potent than malathion. Snawder <strong>and</strong> Chambers 1989<br />

1.0) P=0.18; 4.8; TI<br />

Minimal curvature to severe notochordal<br />

G=0.26; (G): 3.4;<br />

bending. Barrel-shaped embryos. Inactive<br />

(N): 0.37 TI (N):<br />

until disturbed, then responded with<br />

2.4<br />

erratic movements. (p= effect <strong>of</strong><br />

abnormal pigmentation observed; g=<br />

effect <strong>of</strong> abnormal gut observed; n=<br />

abnormal notochord).<br />

malathion Severe defects at low conc. Dose<br />

dependent decrease in length. Abnormal<br />

pigmentation, abnormal gut <strong>and</strong><br />

notochordal bending (dose dependent) as<br />

well as dose dependent reduction <strong>of</strong><br />

intestinal loops with a concurrent<br />

increase in anterior intestine diameter.<br />

Snawder <strong>and</strong> Chambers 1990

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