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Related Concept Videos

Quality Control01:05

Quality Control

1.9K
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...
1.9K
Quality of Water01:19

Quality of Water

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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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Quality Assurance01:19

Quality Assurance

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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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Pulse amplitude and quality01:17

Pulse amplitude and quality

3.1K
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
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Testing Water Quality01:14

Testing Water Quality

387
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...
387
Control System Problem01:21

Control System Problem

423
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
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Related Experiment Video

Updated: Jan 28, 2026

Studying the Protein Quality Control System of D. discoideum Using Temperature-controlled Live Cell Imaging
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Studying the Protein Quality Control System of D. discoideum Using Temperature-controlled Live Cell Imaging

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Dairy Herd Mastitis Quality Control Program.

Douglas L Park1, Dee Morgan1

  • 1Safeway Stores, Inc., Milk Department, Landover, Maryland 20785 and Safeway Stores, Inc., Dairy Division, Department of Quality Control and Research, Oakland, California 94660.

Journal of Food Protection
|March 13, 2019
PubMed
Summary

Mastitis bacteria counts in dairy herds decreased over a year, but peaked in winter and summer. Leucocyte counts alone were unreliable indicators of herd mastitis.

Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Dairy Production

Background:

  • Bovine mastitis is a significant economic concern in dairy farming.
  • Accurate monitoring of mastitis pathogens and indicators is crucial for herd health management.

Purpose of the Study:

  • To evaluate the effectiveness of a mastitis evaluation program over a 12-month period.
  • To assess the relationship between bacterial counts (Streptococcus agalactiae, Staphylococcus aureus) and leucocyte counts in dairy herds.

Main Methods:

  • Milk samples from 34 dairy herds were analyzed over 12 months.
  • Counts of Streptococcus agalactiae, Staphylococcus aureus, and leucocytes were performed.
  • Seasonal trends in bacterial and leucocyte counts were investigated.

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DNA Microarrays: Sample Quality Control, Array Hybridization and Scanning
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DNA Microarrays: Sample Quality Control, Array Hybridization and Scanning

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Evaluation of Microbial Safety of Dairies using Bacterial Proteomic Profiling via MALDI Approach
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Evaluation of Microbial Safety of Dairies using Bacterial Proteomic Profiling via MALDI Approach

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Related Experiment Videos

Last Updated: Jan 28, 2026

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Published on: December 2, 2016

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DNA Microarrays: Sample Quality Control, Array Hybridization and Scanning
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DNA Microarrays: Sample Quality Control, Array Hybridization and Scanning

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Evaluation of Microbial Safety of Dairies using Bacterial Proteomic Profiling via MALDI Approach
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Evaluation of Microbial Safety of Dairies using Bacterial Proteomic Profiling via MALDI Approach

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Main Results:

  • A significant decrease in total mastitic bacterial counts (S. agalactiae + S. aureus) was observed over the study period.
  • Bacterial counts exhibited a bimodal seasonal pattern, with peaks in winter and summer.
  • Leucocyte counts alone were not consistently indicative of herd mastitis levels, with discrepancies noted in approximately 12% of samples.

Conclusions:

  • The mastitis evaluation program showed a reduction in bacterial load, but seasonal factors influence mastitis prevalence.
  • Relying solely on leucocyte counts can be misleading for diagnosing herd mastitis.
  • Integrated monitoring of bacterial pathogens and leucocyte counts is recommended for effective mastitis management in dairy herds.