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Related Concept Videos

Expected Frequencies in Goodness-of-Fit Tests01:19

Expected Frequencies in Goodness-of-Fit Tests

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A goodness-of-fit test is conducted to determine whether the observed frequency values are statistically similar to the frequencies expected for the dataset. Suppose the expected frequencies for a dataset are equal such as when predicting the frequency of any number appearing when casting a die. In that case, the expected frequency is the ratio of the total number of observations (n)  to the number of categories (k).
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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What is a Frequency Distribution00:51

What is a Frequency Distribution

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A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the sample. It is commonly used to group data of quantitative types. Frequency distributions can be displayed in a table, histogram, line graph, dot plot, or pie chart, just to name a few. A histogram is a graphical representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to...
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Mean From a Frequency Distribution01:11

Mean From a Frequency Distribution

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Sometimes, data gathered from an experiment on a large sample or population are organized into concise tables. In such cases, the frequency of the quantitative data set is plotted in the form of a table. Or else, the data values are grouped into the quantity’s intervals, which form classes, and their respective frequencies are known. That is, the data values are distributed over different categories or classes. This is known as frequency distribution.
When such a data set is encountered,...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Frequency Response of BJT01:24

Frequency Response of BJT

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The frequency response of a Bipolar Junction Transistor (BJT) in a common-emitter configuration is critical to its functionality, especially in applications involving amplification of alternating current (AC) signals. This response can be analyzed through low-frequency and high-frequency equivalent circuits, considering various internal parameters and external conditions.
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Updated: Feb 6, 2026

Intracerebroventricular Treatment with Resiniferatoxin and Pain Tests in Mice
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Transplacental Infection: Frequency, Testing, and Treatment.

Christoph Härtel, Karl Oliver Kagan, Dorothee Viemann

    Deutsches Arzteblatt International
    |February 4, 2026
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    Summary
    This summary is machine-generated.

    Preventing and treating transplacental infections, such as cytomegalovirus (CMV), is crucial for fetal health. Early intervention and hygiene education significantly reduce risks for the unborn child.

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    Area of Science:

    • Obstetrics and Gynecology
    • Infectious Diseases
    • Neonatology

    Background:

    • Transplacental infections, caused by viruses (e.g., cytomegalovirus), bacteria, and protozoa, pose serious risks to fetal development.
    • These infections can lead to severe consequences for the unborn child, necessitating a focus on prevention, testing, and treatment.

    Purpose of the Study:

    • To review current strategies for preventing, diagnosing, and treating transplacental infections in pregnant women.
    • To highlight the importance of early detection and intervention to mitigate adverse fetal outcomes.

    Main Methods:

    • A narrative review of pertinent publications from 1946 to 2015.
    • Searches were conducted in PubMed/MEDLINE, Cochrane Library, ClinicalTrials.gov, and Google Scholar, supplemented by medical society guidelines.

    Main Results:

    • Transplacental infections, like CMV, occur with varying incidence rates in Germany (e.g., 1:200 for CMV).
    • While many infected newborns are asymptomatic, risks include sensorineural hearing loss (CMV) and retinochoroiditis (toxoplasmosis), with potential for long-term neurocognitive sequelae.
    • Vertical transmission rates are lower before 20 weeks gestation, but the risk of permanent harm is higher.

    Conclusions:

    • Hygiene education and exposure prophylaxis are key preventive measures for pregnant women.
    • Anti-infectious treatment during pregnancy can decrease transmission risk, and treating symptomatic neonates improves outcomes.