The automatic cab signal system shall be arranged so that cab signals will be continuously controlled in accordance with conditions described in Â§ 236.205 that obtain at least stopping distance in advance. Â§ 236.512 Cab signal indication when locomotive enters block where restrictive conditions obtain.
Dissolved oxygen (DO) is a measure of the quantity of free oxygen molecules in water. The concentration of DO is an important indicator of the health of an aquatic ecosystem because oxygen is essential for almost all forms of life. Oxygen is necessary for respiration and for some chemical reactions.
Hypoxemia is diagnosed by measuring the amount of oxygen in your blood. This is done by pulse oximetry or by an arterial blood gas (ABG) test. Pulse oximetry is done using a small instrument placed on your finger. The pulse oximeter gives a digital reading of the amount of oxygen in your blood.