Chemical-substances Sentence Examples

The curious signs on the coloured carboys in chemists' windows, which were commonly to be seen until the middle of the 19th century, were signs used by the alchemists to indicate various chemical substances.

If we consider now the transformation of one system of chemical substances into another system under specified conditions, we shall find that in general the intrinsic energy of the second system is different from the intrinsic energy of the first.

Aided by grants from the Prussian government, these workers systematically investigated the effect of introducing a large number of different chemical substances (oxides) into vitreous fluxes.

Whereas the soil used to be looked upon solely as a dead, inert material containing certain chemical substances which serve as food constituents.

In these solid solutions, as in aqueous ones, the ratios in which the different chemical substances are present are not fixed or definite, but vary from case to case, not per saltum as between definite chemical compounds, but by infinitesimal steps.

In several of these it appears not unlikely that the recurrent explosive liberations of energy in the muscle tissue are not secondary to recurrent explosions in nerve cells, but are attributable to decompositions arising sua sponte in the chemical substances of the muscle cells themselves in the course of their living.

It is not surprising that the chemical substances produced in it by the decomposition of its living material should not be of a nature indifferent for muscular life.

In the development of toxin-immunity the doses, small at first, are gradually increased in successive inoculations; or, as in the case of very active toxins, the initial injections are made with toxin modified by heat or by the addition of various chemical substances.

In English-speaking countries, and by the majority of German writers, the meaning is now restricted to the study of the action of chemical substances (as apart from foods) on all kinds of animals, from bacteria up to man; it is, in fact, a comparative study of the action of chemical bodies on invertebrate and vertebrate animals.

Never refill coke or drink bottles with chemical substances as these can be mistaken for drink and accidentally ingested.

In some bodies of water, fish and other aquatic life is so badly poisoned that they are unsafe for human consumption, containing heavy metals like mercury, chromium, manganese, and lead, or chemical substances like PCBs and pesticides.

While using organic lotions is important, what really matters is keeping your child's skin from being exposed to all types of dangerous chemical substances.

Compliance with this regulation necessitates letting employees know what chemical substances they may be exposed to on the job and training them regarding the hazards they pose and the measures that should be taken to avoid harm.

The physical changes of puberty are triggered by hormones, chemical substances in the body that act on specific organs and tissues.