By Dr Ananya Mandal, MD. Dopamine is a neurotransmitter released by the brain that plays a number of roles in humans and other animals. Some of its notable functions are in: 1  movement. 2  memory. 3  pleasurable reward.
Sycamores (Platanus spp.) are tall, spreading shade trees. These North American natives have few problems or pests, but their older bark flakes off in patches. If your sycamore is shedding bark, it may be a healthy, maturing tree.
It is used in preference to the native sycamore because it is more resistant to a fungus called anthracnose blight (Gnomonia platani). The fungus attacks young twigs and leaves in the spring, causing them to die and fall off. Repeated attacks on a branch produce clusters of small twigs called witches brooms.