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Related Concept Videos

Response Surface Methodology01:16

Response Surface Methodology

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Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Related Experiment Video

Updated: Jan 22, 2026

Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce
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Optimization of an efficient solid-phase enrichment medium for Salmonella detection using response surface

Feng Tang1, Zhi Chen2, Feng Wang3

  • 1Department of Laboratory Medicine, Wuhan Children's Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, Huazhong University of Science & Technology, Wuhan, 430016, People's Republic of China. tang22feng66@163.com.

AMB Express
|June 30, 2019
PubMed
Summary
This summary is machine-generated.

A new whole-sample solid-phase enrichment assay (WSEA) improves Salmonella detection. This method offers a quick, low-cost, and scalable solution for identifying Salmonella in clinical settings.

Keywords:
Hydrogen sulfideResponse surface methodologySalmonellaSolid-phase enrichment assayVisual detection

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A High-throughput Platform for the Screening of Salmonella spp./Shigella spp.
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Area of Science:

  • Microbiology
  • Biotechnology
  • Food Safety

Background:

  • Salmonella causes food poisoning and infectious intestinal disease.
  • Traditional detection methods lack sensitivity.
  • Previous work involved a visual immunosensor technique.

Purpose of the Study:

  • To establish and optimize a whole-sample solid-phase enrichment assay (WSEA) for Salmonella detection.
  • To improve sensitivity and efficiency compared to traditional methods.

Main Methods:

  • Response surface methodology (RSM) was used to optimize the enrichment medium formula.
  • The optimized medium includes specific concentrations of polyvalent peptone, buffered peptone water, ferric citrate amine, sodium hyposulfite, cystine, super absorbing polymer, sodium deoxycholate, ethyl green, and sodium selenite.
  • Visual detection of Salmonella was achieved through black spot formation on a cellulose-based swab.

Main Results:

  • The optimized WSEA achieved an analytic sensitivity of 10^1 cells/mL, even with high concentrations of interfering bacteria (Escherichia coli at 10^5 cells/mL).
  • Testing on 4006 fecal samples showed a positive rate of 2.12% with WSEA, compared to 0.42% with conventional culture-based methods.
  • The assay allows for naked-eye visualization of Salmonella.

Conclusions:

  • The optimized WSEA provides a rapid, cost-effective, and scalable method for Salmonella detection.
  • This assay is suitable for use in grassroots medical institutions.
  • WSEA significantly improves Salmonella detection rates in clinical samples.