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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

1.8K
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
1.8K
Mass and Weight01:19

Mass and Weight

16.2K
Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the...
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Mass and Weight01:19

Mass and Weight

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1.4K
Mass Spectrum01:23

Mass Spectrum

5.5K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
5.5K
Molar Mass01:54

Molar Mass

89.2K
The identity of a substance is defined not only by the types of atoms or ions it contains but by the quantity of each type of atom or ion. For example, water, H2O, and hydrogen peroxide, H2O2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties.
89.2K
Mass Spectrometers01:16

Mass Spectrometers

10.4K
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
10.4K

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Related Experiment Video

Updated: Mar 24, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

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PQRS Mess.

Amy Lynn Sorrel

    Texas Medicine
    |March 2, 2016
    PubMed
    Summary

    Physician Quality Reporting System participation led to payment cut risks for many doctors. This was due to issues with Medicare quality data collection and analysis for 2014.

    Area of Science:

    • Health policy
    • Medical economics
    • Healthcare quality improvement

    Background:

    • Physician payment models increasingly incorporate quality metrics.
    • The Physician Quality Reporting System (PQRS) and Value Modifier (VM) program are key CMS initiatives.
    • Accurate data collection is crucial for program success and fair physician reimbursement.

    Purpose of the Study:

    • To assess the impact of data collection challenges on physician payment under CMS quality programs.
    • To quantify the risk of payment adjustments due to data issues in 2014.

    Main Methods:

    • Analysis of physician participation in PQRS and VM programs.
    • Examination of Centers for Medicare & Medicaid Services (CMS) data quality and analysis processes for 2014.
    • Identification of physicians at risk for payment adjustments.

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    Main Results:

    • Approximately 25% of physicians faced potential payment reductions.
    • These risks were directly linked to CMS's difficulties in collecting and analyzing 2014 quality data.
    • Systemic issues impacted program integrity and physician financial outcomes.

    Conclusions:

    • CMS data processing challenges pose significant financial risks to physicians.
    • Improvements in data infrastructure are needed for equitable quality program implementation.
    • Physician participation in quality programs is jeopardized by administrative and technical failures.