Discourage the dog from barking during the day and night by always ignoring barks; reward the dog with play and attention when the dog is not barking, and ignore the dog when it is barking. Positive reinforcement will help the dog to learn that barking, during the day or night, does not result in a reward.
The green pigment chlorophyll chlorophyll, green pigment that gives most plants their color and enables them to carry on the process of photosynthesis. Chemically, chlorophyll has several similar forms, each containing a complex ring structure and a long hydrocarbon tail......
All of the other chlorophylls and carotenoids involved in light absorption are referred to as accessory pigments. Another kind of accessory pigment found in some groups of algae and photosynthetic bacteria are the phycobili proteins, which may impart a red or blue color to the cells in which they occur.