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Related Concept Videos

Conservation of Small Populations02:04

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Conservation of Declining Populations02:07

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A complete procedure of testing the hypothesis about a population mean is explained here.
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Discrimination and Characterization of Heterocellular Populations Using Quantitative Imaging Techniques
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DXA Imaging in Nontypical Populations.

Dana M Black

    Radiologic Technology
    |April 26, 2018
    PubMed
    Summary

    Osteoporosis diagnosis and bone density measurement using dual-energy x-ray absorptiometry (DXA) are discussed. The article explores established uses in older adults and alternative applications in younger populations.

    Area of Science:

    • Radiology
    • Orthopedics
    • Geriatrics

    Background:

    • Osteoporosis is a skeletal disease characterized by low bone mass and tissue deterioration.
    • Dual-energy x-ray absorptiometry (DXA) is a standard tool for assessing bone density.
    • Current DXA applications primarily focus on geriatric patients.

    Purpose of the Study:

    • To discuss the diagnosis of osteoporosis.
    • To explore alternative indications for DXA examinations.
    • To highlight the role of radiologic technologists in DXA procedures across different age groups.

    Main Methods:

    • Review of existing literature on osteoporosis diagnosis.
    • Analysis of clinical guidelines for DXA use.
    • Discussion of DXA applications beyond geriatric populations.

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    Main Results:

    • DXA is a well-established method for bone mass evaluation in the elderly.
    • DXA can be utilized for younger adults and children, expanding its clinical utility.
    • Understanding alternative indications is crucial for comprehensive patient care.

    Conclusions:

    • DXA is a versatile imaging technique with applications beyond osteoporosis screening in older adults.
    • Radiologic technologists play a key role in performing DXA across diverse patient demographics.
    • Further research may elucidate additional benefits of DXA in various clinical scenarios.