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Related Concept Videos

Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Free Energy01:21

Free Energy

Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break down the...
An Introduction to Free Energy01:05

An Introduction to Free Energy

How can we compare the energy that releases from one reaction to that of another reaction? We use a measurement of free energy to quantitate these energy transfers. Scientists call this free energy Gibbs free energy (abbreviated with the letter G) after Josiah Willard Gibbs, the scientist who developed the measurement. According to the second law of thermodynamics, all energy transfers involve losing some energy in an unusable form such as heat, resulting in entropy. Gibbs free energy...
Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

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 stabilized by...
Sources of Law01:26

Sources of Law

Laws form the essential rules set by governing authorities to shape and control societal behavior. In nursing, laws guide actions, safeguard patient rights, define nurses' scope of practice, and maintain professional standards. Understanding the legal framework governing nursing involves recognizing four primary sources of law: constitutional, statutory, administrative (regulatory), and common law.
Constitutional law is foundational, deriving from federal and state constitutions, and...
Lenz's Law01:15

Lenz's Law

The direction in which the induced emf drives the current around a wire loop can be found through the negative sign. However, it is usually easier to determine this direction with Lenz's law, named in honor of its discoverer, Heinrich Lenz (1804–1865). Lenz's law states that the direction of the induced emf drives the current around a wire loop always to oppose the change in magnetic flux that causes the emf.
If a bar magnet is moved toward a coil such that the magnetic flux through the coil...

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Related Experiment Video

Updated: Jun 26, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
11:57

Fabricating Metamaterials Using the Fiber Drawing Method

Published on: October 18, 2012

Freedom of materials.

Michael B Yaffe

    Science Signaling
    |January 30, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Sharing scientific data and materials is often hindered by restrictive policies, creating a barrier for academic research and innovation. This situation impedes the progress of small molecule research and drug discovery.

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    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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    Fabricating Metamaterials Using the Fiber Drawing Method
    11:57

    Fabricating Metamaterials Using the Fiber Drawing Method

    Published on: October 18, 2012

    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
    09:39

    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

    Published on: June 28, 2024

    Area of Science:

    • Biochemistry
    • Medicinal Chemistry
    • Intellectual Property Law

    Background:

    • Data and material sharing policies in scientific publishing are often undermined by restrictive terms, limiting their practical utility.
    • Academic scientists face a dilemma where disclosing structural data for small molecules can lead to commercial patenting, hindering further academic investigation.
    • Commercial entities may legally restrict access to patented molecules, even when they publish original research subject to data-sharing agreements.

    Discussion:

    • The current framework for sharing scientific data and materials presents significant challenges for academic researchers.
    • The 'Catch-22' situation regarding structural data disclosure and patenting stifles collaborative research and innovation in small molecule development.
    • Journal policies on data sharing are often circumvented by legal restrictions imposed after patenting.

    Key Insights:

    • Restrictive policies render shared scientific data and materials largely unusable.
    • Disclosure of small molecule structures facilitates commercial patenting, impeding academic research.
    • Patented molecules, even from published research, face restricted access and use.

    Outlook:

    • Revising data sharing policies to ensure genuine accessibility is crucial.
    • Developing mechanisms to balance intellectual property rights with the needs of academic research is essential.
    • Fostering a more open and collaborative research environment is necessary for scientific advancement.