Understanding Vivarium Substrates. By A. C. Highfield. Libyan tortoise-this tortoise requires a sandy, dry substrate. If maintained on grass or upon a moist substrate it will suffer shell and respiratory infections.Along with heating and lighting systems, the choice of substrate in tortoise vivaria and terraria often causes a great deal of confusion to keepers.Some substrates are excellent, others positively lethal.nderstanding Vivarium Substrates. By A. C. Highfield. Libyan tortoise-this tortoise requires a sandy, dry substrate. If maintained on grass or upon a moist substrate it will suffer shell and respiratory infections.
In their general structure, heterocyclic compounds resemble cyclic organic compounds that incorporate only carbon atoms in the ringsâfor example, cyclopropane (with a three-carbon-atom ring) or benzene (with a six-carbon-atom ring)âbut the presence of the heteroatoms gives heterocyclic compounds physical and chemical properties that are often quite ...
Aromatic compounds are substances that consist of one or more rings that contain alternating single and double bonds in its chemical structure. In real life, many aromatic compounds have an odor, there are some compounds that are chemically aromatic, but do not have a distinct smell.For example, benzene is an aromatic compound. The chemical structure of benzene, as illustrated below, contains a hexagon ring with alternating double bonds.uckel's Rule: Definition and Examples. Earlier, we saw that there are double bonds in the ring that is present in the chemical structure of aromatic compounds. These double bonds contain electrons called pi electrons.