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Related Concept Videos

Sulfur Assimilation01:20

Sulfur Assimilation

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Minerals01:26

Minerals

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Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
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Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Microorganisms in Agriculture and Food industry01:27

Microorganisms in Agriculture and Food industry

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Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...
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The Sulfur Cycle01:22

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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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The Soil Ecosystem02:23

The Soil Ecosystem

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Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
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Related Experiment Video

Updated: Oct 13, 2025

Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon
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Reflecting on 'Selenium in Global Food Systems'.

Gerald Fuson Combs1

  • 1Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA.

The British Journal of Nutrition
|November 15, 2021
PubMed
Summary

This review revisits the 1993

Area of Science:

  • Nutritional Sciences
  • Environmental Science

Background:

  • The 1993 review "Selenium in Global Food Systems" established baseline knowledge.
  • Global food systems face ongoing challenges with nutrient distribution and bioavailability.

Purpose of the Study:

  • To re-evaluate the original review's findings in light of subsequent research.
  • To highlight key advancements in selenium research over the past two decades.

Main Methods:

  • Literature review of key publications since 1993.
  • Analysis of trends in selenium research and its impact on global food systems.

Main Results:

  • Significant progress has been made in understanding selenium's role in human and animal health.
  • New data reveals geographical variations in selenium levels and dietary intake.

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  • The interconnectedness of selenium, soil health, and food security is increasingly evident.

    • Conclusions:

    • Continued research is crucial for optimizing selenium intake globally.
    • Addressing selenium deficiencies and toxicities requires integrated approaches in agriculture and public health.
    • The original review's messages remain relevant, underscoring the need for ongoing monitoring and intervention.