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Related Concept Videos

Isotopes01:12

Isotopes

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Elements have a set number of protons that determines their atomic number (Z). For example, all atoms with eight protons are oxygen; however, the number of neutrons can vary for atoms of the same element. The sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are called isotopes. Elements can have multiple isotopes, for example, carbon-12, carbon-13, and carbon-14.
An element's atomic mass, or weight,...
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Systematic Sampling Method01:17

Systematic Sampling Method

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Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
Systematic sampling is one of the simplest methods...
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Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

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A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
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Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

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Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
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Random and Systematic Errors01:20

Random and Systematic Errors

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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing...
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DNA Stable-Isotope Probing DNA-SIP
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Geographical traceability of bacteria based on a systematic stable isotope analysis method.

Wei Wang1,2,3, Bichun Zhao4, Zhuotong Cai1,2

  • 1People's Public Security University of China, Beijing, 100038, China.

Applied Microbiology and Biotechnology
|January 19, 2026
PubMed
Summary

Stable isotope analysis can now trace bacterial origins. This study established a method showing linear H/O isotope correlations between bacteria like E. coli and their water source, enabling accurate geographical traceability.

Keywords:
BacteriaGeographical traceabilityIsotope fractionation patternMulti-isotope combination discriminant modelStable isotope analysis method

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Area of Science:

  • Microbiology
  • Environmental Science
  • Analytical Chemistry

Background:

  • Bacterial outbreaks pose significant public health and economic risks.
  • Accurate bacterial origin tracing is crucial for public safety.
  • Existing methods for bacterial traceability lack practical application in real-world scenarios.

Purpose of the Study:

  • To establish a systematic stable isotope analysis method for bacteria and their culture conditions.
  • To explore the relationship between bacterial stable isotopes and their geographical cultivation sites.
  • To develop a model for accurate bacterial geographical traceability.

Main Methods:

  • Cultured Escherichia coli and Staphylococcus aureus using water from five distinct regions and various culture media.
  • Measured stable isotope ratios (H/O/C/N) in bacteria and culture media.
  • Developed a multi-isotope discriminant model for traceability.

Main Results:

  • Identified linear relationships between hydrogen and oxygen stable isotopes in bacteria and their culture water.
  • The multi-isotope discriminant model achieved 100% accuracy in identifying culture media types.
  • Demonstrated the potential to infer bacterial cultivation regions and sources using isotope analysis.

Conclusions:

  • Stable isotope analysis of bacteria provides a viable method for geographical traceability.
  • The established method and model significantly improve the efficiency and accuracy of bacterial source identification.
  • This research offers a comprehensive framework for advancing bacterial traceability studies.