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Related Concept Videos

Classifying Matter by State02:49

Classifying Matter by State

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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
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Physical and Chemical Properties of Matter02:57

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The characteristics that enable us to distinguish one substance from another are called properties.
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The Atomic Theory of Matter02:59

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The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
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What is Matter?01:13

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The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of...
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States of Matter01:20

States of Matter

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Solids, liquids, and gases are the three states of matter commonly found on Earth. A solid is rigid and possesses a definite shape. A liquid flows and takes the shape of its container, except it forms a flat or slightly curved upper surface when acted upon by gravity. Both liquid and solid samples have volumes nearly independent of pressure. A gas takes both the shape and volume of its container.
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Updated: Feb 1, 2026

A Blood-Free Diet to Rear Anopheline Mosquitoes
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Diet and colon: what matters?

Pan Pan1, Jianhua Yu2, Li-Shu Wang1

  • 1Division of Hematology and Oncology, Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin.

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Summary

Adopting a healthy diet, like the Mediterranean pattern, can significantly lower colorectal cancer (CRC) risk. Following cancer prevention guidelines is key to reducing CRC incidence.

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Area of Science:

  • Oncology
  • Nutritional Science
  • Epidemiology

Background:

  • Colorectal cancer (CRC) is a leading cause of cancer death globally.
  • Dietary factors significantly influence CRC risk, with processed meats being a known risk factor.
  • The impact of other dietary components and overall dietary patterns on CRC risk requires further clarification.

Purpose of the Study:

  • To review and synthesize recent research on dietary patterns and their association with colorectal cancer (CRC) risk.
  • To examine the complexity of dietary diversity and overall food consumption in relation to CRC.
  • To provide insights into evidence-based dietary recommendations for CRC prevention.

Main Methods:

  • Systematic review of human studies published between 2017 and 2018.
  • Inclusion of meta-analyses, cohort studies, and prospective studies.
  • Evaluation of 30 selected articles focusing on dietary patterns and CRC risk.

Main Results:

  • Prudent or Mediterranean dietary patterns are associated with a significantly decreased risk of CRC compared to Western patterns.
  • A lower dietary inflammatory index and higher dietary quality index correlate with reduced CRC risk.
  • Adherence to World Cancer Research Fund/American Institute for Cancer Research cancer prevention guidelines is linked to a lower CRC risk.

Conclusions:

  • Adopting healthier dietary patterns and lifestyles can reduce the risk of developing colorectal cancer.
  • Further research is necessary to fully understand the impact of diet on CRC clinical outcomes.