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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. 
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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

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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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When do co-infections matter?

Andrew J McArdle1, Anna Turkova2, Aubrey J Cunnington3

  • 1Paediatric Infectious Diseases, St George's Hospital.

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Summary
This summary is machine-generated.

Understanding co-infections is crucial as diagnostic methods improve. While some co-infections are harmful, others may be beneficial, presenting complex challenges for research and treatment.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Microbiology

Background:

  • Advances in diagnostics increasingly detect co-infections in clinical settings.
  • The clinical significance of many co-infections remains unclear.
  • Basic science investigates pathogen interactions to explain clinical observations.

Purpose of the Study:

  • To review the significance of co-infections.
  • To explore the mechanisms underlying co-infection outcomes.
  • To highlight challenges and potential strategies for studying co-infections.

Main Methods:

  • Review of recent clinical and basic science literature.
  • Analysis of host response modulation, diagnostic test interference, and drug-drug interactions.
  • Consideration of animal models and prospective human studies.

Main Results:

  • Co-infections can be insignificant, detrimental, or beneficial.
  • Chronic co-infections (e.g., HIV with TB, Hepatitis B/C) have established detrimental effects.
  • Outcomes of acute co-infections are less certain, with conflicting findings.
  • Challenges exist in studying naturally acquired human infections.

Conclusions:

  • Further research using animal models and prospective human studies is warranted.
  • Identifying and treating co-infections holds promise for improved health outcomes.
  • Understanding co-infection dynamics is essential for effective clinical management.