PRRS exists in two distinct forms, reproductive and respiratory, and infected farms may experience one or both. A variety of factors, including swine genetics, the specific PRRS virus variants in the herd, health status of the herd, ages of the animals involved, and pregnancy status, may influence the clinical signs.
8495 Karma. 1. Silicon is a metal and oxygen is a non metal hence it will form both ionic and covalent bonds, pauling principle explains the ratio in detail.Was this answer helpful?495 Karma. 1. Silicon is a metal and oxygen is a non metal hence it will form both ionic and covalent bonds, pauling principle explains the ratio in detail.
Reaction of silicon with air. The surface of lumps of silicon is protected by a very thin layer of silicon dioxide, SiO 2. This renders silicon more or less inert to further oxidation by air even up to about 900Â°C. After this, reaction with oxygen in the air gives silicon dioxide.At temperatures above about 1400Â°C, silicon reacts with nitrogen, N 2, in the air as well as oxygen, to form the silicon nitrides SiN and Si 3 N 4.his renders silicon more or less inert to further oxidation by air even up to about 900Â°C. After this, reaction with oxygen in the air gives silicon dioxide. At temperatures above about 1400Â°C, silicon reacts with nitrogen, N 2, in the air as well as oxygen, to form the silicon nitrides SiN and Si 3 N 4.