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Related Concept Videos

Short-distance Transport of Resources02:12

Short-distance Transport of Resources

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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ABC Transporters: Importer01:27

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ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
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Carrier Transport01:21

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Factors Affecting Drug Distribution: Miscellaneous Factors01:19

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Drug distribution in the human body is a complex process influenced by various individual factors, including age, pregnancy, obesity, diet, body water composition, pH levels, and specific disease conditions.
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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Related Experiment Video

Updated: May 2, 2026

Original Experimental Approach for Assessing Transport Fuel Stability
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Freight shipment modal split and its environmental impacts: an exploratory study.

Taesung Hwang, Yanfeng Ouyang

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    |March 14, 2014
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    This summary is machine-generated.

    Understanding freight modal choices between truck and rail is crucial for reducing air pollution. This study uses a binomial logit model to analyze how factors like oil prices influence shipper decisions, impacting air quality.

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    Area of Science:

    • Environmental Science
    • Transportation Logistics
    • Econometrics

    Background:

    • Freight transportation significantly contributes to U.S. air pollution and greenhouse gas emissions.
    • Diverse impacts on air quality and sustainability necessitate understanding interregional freight shipment mode choices.

    Purpose of the Study:

    • To develop a predictive model for interregional freight modal share between truck and rail.
    • To analyze the influence of freight and shipment characteristics, including oil prices, on modal choices.

    Main Methods:

    • Development of a binomial logit market share model.
    • Integration of multiyear freight and geographical information databases.
    • Construction of regression models for typical freight commodities.

    Main Results:

    • The model predicts freight modal share based on shipment characteristics.
    • Analysis quantifies the atmospheric impact levels of different modal choices.
    • Insights provided on the relationship between freight modal split, oil price changes, and air quality.

    Conclusions:

    • Freight transportation is a major source of energy consumption and air pollution, with varying emissions across modes.
    • Understanding freight shipment mode choice is key to assessing and mitigating environmental impacts.
    • The developed binomial logit model aids policymakers in evaluating freight movement effects on air quality and public health.