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It is easy to overlook the importance of the sense of smell. Smell affects human health and safety. The sense of smell plays an essential role in the taste of food. It can also warn us of spoiled or unsafe food by its rancid odor. Smell can give pleasure, as with the fragrance of flowers, or make us nauseated, as when we smell a foul odor. Fragrances can bring back pleasant memories. The loss of smell can cause depression. With those things in mind, researchers are creating a smell map.

Maps of the receptors for vision, hearing, and touch have been developed previously, but this research was the first to create a detailed map of the receptors for smell. The research began by studying the smell receptors in mice. The challenge in creating a smell map is that it is more complex than the other senses. There are only three main receptor types needed for color vision, but mice have 20 million olfactory neurons and more than 1,000 types of odor receptors that detect unique subsets of odor molecules.

Before creating a smell map, the prevailing theory was that the smell receptors were randomly placed. The study showed that smell receptors form horizontal stripes from the top of the nose to the bottom, and the order matches the brain’s olfactory bulb. Further study will explore human olfactory receptors to compare them with those in mice.

This research is important because it will help scientists develop therapies for people who have lost their sense of smell, as has sometimes been the case with COVID-19. As we learn more about how the sense of smell works, we see evidence of design. The bottom line is that we are “fearfully and wonderfully made” (Psalms 139:14). The design of life, and especially the human body, shows evidence of a Designer, not random chance.

Reference: Harvard Medical School hms.harvard.edu

Chemical Warfare in the Plant World - Lima Beans — Lima Beans

We mentioned yesterday that plants use scents to attract friendly and helpful insects and animals. They also use fragrances to protect against unfriendly visitors. Seemingly passive plants have secret weapons against insect invasions. We call it chemical warfare in the plant world.

A good example is the lima bean. Spider mites attack lima bean plants, but other predatory mites eat spider mites. When spider mites attack a lima bean plant, it floods the area with a chemical signal that attracts the predatory mites. This chemical odor also causes other lima bean plants to emit the same chemical. When the spider mites are gone, the plants stop secreting the chemical.

Some plants, such as tobacco and corn, protect themselves from destructive caterpillars by sending off a signal to attract wasps. Research has shown that plants customize the signal to attract a particular species of wasp. The wasps can tell the difference between the chemical signal of plants attacked by tobacco budworms and corn earworms, and different chemicals attract a different wasp species. So far, cotton, corn, and beets have been shown to have different emissions as they call for protection.

We previously mentioned wasps that kill and eat the caterpillars of certain butterflies. In that instance, ants have a symbiotic relationship with the caterpillars to protect them from the wasps in exchange for food. The U. S. Department of Agriculture is looking to find ways to cause one insect to combat another. This research is necessary because it can help us find ways to protect crops.

Chemical warfare in the plant world shows that God has equipped plants to protect themselves against different insect scourges. Because of that, we can survive on a planet where insects hopelessly outnumber us. The design that the Creator put into living systems is truly amazing.

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Creating a Smell Map

Chemical Warfare in the Plant World