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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Quality Control01:05

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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
Quality control helps track data, visualize trends, and identify variations, making it easier to detect deviations that may affect the accuracy of an analysis. One way to do this is by generating a quality control chart, which...
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Quality Assurance01:19

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Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...
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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Molecular Models02:00

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Molecular Compounds: Formulas and Nomenclature03:10

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Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. 
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Related Experiment Video

Updated: Jan 30, 2026

Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus
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Ensuring quality in cervical screening programmes based on molecular human papillomavirus testing.

Kate Cuschieri1,2, Rob Schuurman3, Suzie Coughlan4

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Cytopathology : Official Journal of the British Society for Clinical Cytology
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Summary
This summary is machine-generated.

Quality assurance for human papillomavirus (HPV) testing in cervical screening is vital. This review covers laboratory assay validation, quality control, and external quality assurance schemes to ensure reliable HPV testing.

Keywords:
human papillomavirusmolecular testingquality assurancequality controlverification

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Area of Science:

  • Clinical Diagnostics
  • Molecular Biology
  • Public Health

Background:

  • Cervical screening programs are increasingly adopting human papillomavirus (HPV) testing.
  • This shift necessitates robust laboratory services to ensure test accuracy and reliability.
  • Maintaining high quality is paramount for the success of these screening programs.

Purpose of the Study:

  • To review quality considerations and challenges in laboratory-based HPV testing for cervical screening.
  • To emphasize key aspects of laboratory quality assurance, including assay validation and quality control.
  • To discuss the role of external entities in HPV testing quality.

Main Methods:

  • Review of current literature and guidelines on HPV testing in cervical screening.
  • Analysis of quality assurance components: assay/platform validation, internal quality control (IQC), and external quality assurance (EQA).
  • Discussion of the influence of regulatory agencies, guideline developers, commissioners, and commercial providers.

Main Results:

  • Assay and platform validation are critical for initial test quality.
  • Internal quality control selection impacts ongoing monitoring of test performance.
  • External quality assurance schemes have varying strengths and weaknesses in ensuring consistent quality.
  • External entities play a significant role in shaping quality standards and implementation.

Conclusions:

  • Comprehensive quality assurance is essential for reliable human papillomavirus testing in cervical screening.
  • Addressing laboratory-specific challenges in validation, IQC, and EQA is crucial.
  • Collaboration with and understanding the roles of external stakeholders are important for program success.