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Related Concept Videos

Types of Selection01:46

Types of Selection

45.3K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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What is Natural Selection?01:32

What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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Antibiotic Selection00:57

Antibiotic Selection

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Overview
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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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Acute Pharyngitis01:30

Acute Pharyngitis

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Introduction
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
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Physiology of Enteric Nervous System and Gut Health01:05

Physiology of Enteric Nervous System and Gut Health

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The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
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Related Experiment Video

Updated: Feb 11, 2026

Technical Refinement of a Bilateral Renal Ischemia-Reperfusion Mouse Model for Acute Kidney Injury Research
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Technical Refinement of a Bilateral Renal Ischemia-Reperfusion Mouse Model for Acute Kidney Injury Research

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Selective angiography in acute mid-gut ischaemia.

D R Harper, T A Buist

    Gut
    |February 1, 1978
    PubMed
    Summary

    Early diagnosis of acute mesenteric ischemia is crucial due to high mortality. Selective angiography helps differentiate vascular occlusion needing surgery from non-occlusive cases where surgery is contraindicated.

    Area of Science:

    • Gastroenterology
    • Vascular Surgery
    • Diagnostic Imaging

    Background:

    • Acute mesenteric ischemia presents a significant clinical challenge with high patient mortality rates.
    • Timely and accurate diagnosis is paramount for effective management and improved outcomes.
    • Treatment strategies must be tailored to the specific type and severity of vascular compromise.

    Observation:

    • Selective angiography serves as a key diagnostic tool in evaluating acute mesenteric ischemia.
    • This imaging technique can accurately identify acute vascular occlusion.
    • It also distinguishes between occlusive and non-occlusive patterns of mesenteric ischemia.

    Findings:

    • Selective angiography effectively diagnoses acute mesenteric ischemia.
    • It differentiates patients requiring immediate surgical intervention for vascular occlusion.

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  • Crucially, it identifies non-occlusive mesenteric ischemia where early surgery is inadvisable.

    • Implications:

    • Accurate diagnosis via selective angiography enables appropriate and timely treatment decisions.
    • Distinguishing between occlusive and non-occlusive ischemia optimizes surgical versus non-surgical management pathways.
    • This diagnostic approach is vital for reducing mortality associated with acute mesenteric ischemia.