Annual spring and summer, the grass on the lawn are mustering the effort to channeling, and soon grass will grow tall, horticultural workers have to push mower to trim the grass on the lawn. Then if you happen to pass by, emitting bursts of fragrance when mowing may make you feel pleasure, more pleasant fragrant grass ah ...... study said, long grass incense not only make people feel better, but also let some aggressive insects weakened. When bees are attracted to this fresh taste, they become gentle, not good move.
However, not all people can smell the fresh, fragrant grass. In fact, not just grass fragrant, like the smell, the smell of violets cheese, etc., always someone smell, some smell. Moreover, even if some people smell, feel they vary widely, and some people feel good news, some people feel pungent. what happened?
There are special "gas Receiver" on our noses - olfactory receptors. The reason why we can smell the odor, because the odor molecules activated olfactory receptors, olfactory experience that generates an electrical signal, and then the signal to the brain, so that we "smell" the smell. The vast majority are odor molecules from a variety of gases, each gas molecule capable of activating a plurality of olfactory receptor genes, and therefore, although only more than 400 human genes responsible for compiling the olfactory receptors total, but after the combination, we can identify, on the memory of thousands of different odors.
Scientists have discovered that a person can smell grassy, this is caused by differences in human genes - only those who have the gene expression of the protein odor can smell these odors, otherwise smell. Also, if the relevant gene mutation, the people of this odor-induced force will be reduced and become insensitive. Take smells like violets ionone as an example, the researchers accurately find the variation in the olfactory receptor gene OR5A1, it is this gene determines the people of this compound and sniff it as floral sensitivity. Those who carry the mutant gene becomes insensitive to ionone. Even the smell, they are not the same feeling, the smell a bit sour for them, but also a bit spicy, I do not like to discuss them. The green grass is also true - if the smell of grass olfactory receptor genes OR2J3 mutate, then people will respond to grassy dulled.
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