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Standard Enthalpy of Formation02:37

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Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
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Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...
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Nurses bear specific legal responsibilities under several federal statutes, including:
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Standards in Pupillography.

Carina Kelbsch1, Torsten Strasser1, Yanjun Chen2

  • 1Pupil Research Group, Centre for Ophthalmology, University Hospitals Tübingen, Tübingen, Germany.

Frontiers in Neurology
|March 12, 2019
PubMed
Summary
This summary is machine-generated.

New standards for pupillography are essential due to increased research. This manuscript outlines recommended methodologies for recording conditions, stimulus characteristics, and evaluation parameters to improve study comparability.

Keywords:
analysisapplication of pupillographyclinical standardsparameters of evaluationpupillographypupillometrystimulus characteristics

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Chronobiology
  • Psychology

Background:

  • Growing research in pupillography necessitates standardized methodologies.
  • Intrinsically photosensitive retinal ganglion cells (ipRGCs) have broadened pupillography applications.
  • Color pupillography is vital for research and clinical studies, including gene therapy and psychopathology.

Purpose of the Study:

  • To establish new standards for pupillography methodology.
  • To formalize recording conditions, stimulus characteristics, and evaluation parameters.
  • To enhance the comparability of pupillographic studies across different research fields.

Main Methods:

  • Development of a minimum set of variables for pupillography.
  • Recommendations based on expert knowledge from the International Pupil Colloquium.
  • Outline of general standards and specific suggestions for diverse research targets.

Main Results:

  • A framework for standardized pupillography is proposed.
  • Guidelines address stimulus parameters, background illumination, and adaptation states.
  • Specific recommendations cater to research on reflex arcs, pharmacology, psychology, sleepiness, and animal models.

Conclusions:

  • Standardized pupillography will improve data consistency and reproducibility.
  • These standards will aid researchers, especially those new to the field.
  • The proposed guidelines facilitate broader and more accurate application of pupillography.