Related topics: cells · protein · plants · blood vessels · cancer cells

Mapping the ocean's unseen heroes, one microbe at a time

The picture of how climate change is impacting our ocean is often told via its larger inhabitants: scrawny polar bears, bleached coral, dwindling catch in fishing nets. But just as importantly, microscopic marine organisms ...

Homemade cat food diets could be risky

One quick Google search can net hundreds of homemade cat food recipes, but a new study from researchers at the University of California, Davis, finds most are unlikely to provide cats all their essential nutrients. Some recipes ...

Addressing food insecurity in the digital age

In the search for food —whether through foraging, hunting or agriculture —we are constantly at war with nature. In addition, food is distributed unequally: over 800 million people experience hunger while two billion ...

New view of how ocean 'pumps' impact climate change

Earth's oceans have a remarkable natural ability to pull carbon from the atmosphere and store it deep within the ocean waters, exerting an important control on the global climate.

The dirt on soil loss from the Midwest floods

As devastating images of the 2019 Midwest floods fade from view, an insidious and longer-term problem is emerging across its vast plains: The loss of topsoil that much of the nation's food supply relies on.

How bugs overcome host defenses

Bacterial pathogens must acquire nutrient metals from the host to survive and cause disease. To counter infection, hosts attempt to starve bacteria by hiding metals away in a process called "nutritional immunity." Bacteria ...

Rusted root: Weedy rice repeatedly evolves 'cheater' root traits

Weedy rice is neither wild rice nor crop rice, but rice gone rogue that has shed some traits important to people. It also is an incredibly aggressive, potentially detrimental weed that pops up almost everywhere rice is grown, ...

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Nutrient

A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment. They are used to build and repair tissues, regulate body processes and are converted to and used as energy. Methods for nutrient intake vary, with animals and protists consuming foods that are digested by an internal digestive system, but most plants ingest nutrients directly from the soil through their roots or from the atmosphere.

Organic nutrients include carbohydrates, fats, proteins (or their building blocks, amino acids), and vitamins. Inorganic chemical compounds such as dietary minerals, water, and oxygen may also be considered nutrients. A nutrient is said to be "essential" if it must be obtained from an external source, either because the organism cannot synthesize it or produces insufficient quantities. Nutrients needed in very small amounts are micronutrients and those that are needed in larger quantities are called macronutrients. The effects of nutrients are dose-dependent and shortages are called deficiencies.

See healthy diet for more information on the role of nutrients in human nutrition.

This text uses material from Wikipedia, licensed under CC BY-SA