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Related Concept Videos

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

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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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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.
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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
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Frequency Response of BJT01:24

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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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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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High-Resolution Comparison of Bacterial Conjugation Frequencies
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Frequency of Macroprolactin in Hyperprolactinemia.

Noreen Abbas Sherazi1, Mirza Zain Baig2, Aysha Habib Khan3

  • 1Department of Clinical Chemistry and Immunology, Chughtai Laboratory, Karachi.

Journal of the College of Physicians and Surgeons--Pakistan : JCPSP
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Macroprolactin (MaPRL) is common in patients with high prolactin levels, occurring in 60.7% of cases. Screening for MaPRL using PEG precipitation is a simple and cost-effective diagnostic method.

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Area of Science:

  • Clinical Chemistry
  • Endocrinology
  • Laboratory Medicine

Background:

  • Hyperprolactinemia is a common endocrine disorder.
  • Macroprolactin (MaPRL) can interfere with standard prolactin assays.
  • Distinguishing MaPRL from true hyperprolactinemia is crucial for appropriate patient management.

Purpose of the Study:

  • To determine the frequency of Macroprolactin (MaPRL) in patients with elevated total prolactin levels.
  • To assess the clinical and financial impact of MaPRL in this patient population.

Main Methods:

  • A cross-sectional study was conducted at Aga Khan University Hospital.
  • Patients with high total prolactin were screened using polyethylene glycol (PEG) precipitation.
  • Clinical data and costs of further investigations were collected via telephonic interviews.

Main Results:

  • Macroprolactinemia was identified in 145 (60.7%) patients, while true hyperprolactinemia was found in 94 (39.3%).
  • Clinical features differed between groups, with galactorrhea more prevalent in true hyperprolactinemic females.
  • Diagnostic workup, including imaging, incurred significantly higher costs in the true hyperprolactinemia group (p <0.001).

Conclusions:

  • Macroprolactin (MaPRL) is frequently encountered in patients presenting with hyperprolactinemia.
  • Screening for MaPRL using PEG precipitation is a straightforward and cost-effective laboratory technique.