Quantum dots (one of the two other fluorescence/optical imaging agents) are made of CdSe/Cds/ZnS core materials that are toxic, for example.
Bulb plants like daffodils and onion flower are toxic for cats, for example.
It is toxic for everyone and dangerously toxic for children.
Several medicinal plants have been found to be toxic to humans, for example, Ziziphus mucronata and Athrixia phylicoides [ 43].
Oxygen may be toxic to the lungs (for example, tracheobronchitis, absorption atelectasis, hypoxic pulmonary vasoconstriction and hyperoxia-induced lung injury), the circulation and the brain tissue itself (seizures or lipid peroxidation) [ 88], and hyperoxia has been associated with increased mortality in patients with various acute neurological disease processes [ 24, 89- 91].
However, some metal oxides are highly toxic, for example, Al2O3 toxicity toward many cells [8].
A number of observations have established that phytophagous insects can adapt to bitter substances if they are not toxic, for example by reducing the sensitivity of their taste neurons [64] or by increasing the response to a feeding stimulant specific to their host plant based on their experience [65].
Some carbamates are highly toxic, for example aldicarb (2-methyl-2-[methylthio] propionaldehyde o-[methylcarbamoyl] Oxime) which has an oral 50% lethal dose (LD50) of 0.3 to 0.9 mg/kg, carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranylmethylcarbamate) which has an oral LD50 of 8 mg/kg, and carbaryl (1-naphthyl methylcarbamate) which has an oral LD50 of 12.5 mg/kg [ 7].
