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Related Concept Videos

Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Limitations of Friedel–Crafts Reactions01:26

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Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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Filtration and Urine Formation01:32

Filtration and Urine Formation

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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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Drug Discovery: Overview01:26

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Drug discovery is a multifaceted process involving extensive screening, testing, and optimization of lead compounds to identify potential new drugs for therapeutic use. It combines several approaches, including screening large numbers of natural products, chemical modification of known active molecules, identification of new drug targets, and rational design based on biological mechanisms and drug-receptor structure. These approaches are carried out in both academic research laboratories and...
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Related Experiment Video

Updated: Mar 26, 2026

Pattern-based Search of Epigenomic Data Using GeNemo
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Pattern-based Search of Epigenomic Data Using GeNemo

Published on: October 8, 2017

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Limits of search filter development.

Nancy L Wilczynski, Cynthia Lokker, Kathleen Ann McKibbon

    Journal of the Medical Library Association : JMLA
    |January 26, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Developing search filters for nursing and rehabilitation literature proved challenging. The broad and overlapping scopes of practice in these fields limited the effectiveness of standard search filter development methods.

    Keywords:
    Databases, BibliographicInformation Storage and RetrievalNursingOccupational TherapyPhysical Therapy SpecialtySearch EngineTerminology as Topic

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    Area of Science:

    • Health Sciences
    • Information Science

    Background:

    • Biomedical literature databases are crucial for evidence-based practice.
    • Effective search filters enhance the retrieval of clinically relevant studies.

    Purpose of the Study:

    • To develop and evaluate search filters for biomedical literature databases.
    • To improve the identification of studies relevant to nursing and rehabilitation professions.

    Main Methods:

    • A diagnostic testing framework was employed.
    • Machine-culled and practitioner-nominated search terms were compared against a hand-tagged clinical literature database.

    Main Results:

    • Search filters for nursing could not be developed.
    • Search filters for rehabilitation could not be developed.

    Conclusions:

    • Limitations exist in developing search filters for nursing and rehabilitation.
    • The expansive and multifaceted nature of nursing and rehabilitation practice contributed to these limitations.