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Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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States of Water01:23

States of Water

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
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Design Example: Marking Boundaries of a Site Using a Compass01:12

Design Example: Marking Boundaries of a Site Using a Compass

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Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
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Sight Distance in a Vertical Curve01:29

Sight Distance in a Vertical Curve

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Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
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Plotting of Topographic Maps01:29

Plotting of Topographic Maps

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Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Topographic Surveying and Contours01:29

Topographic Surveying and Contours

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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Related Experiment Video

Updated: Apr 18, 2026

Methods for Image-based Surveys of Benthic Macroinvertebrates and Their Habitat Exemplified by the Drop Camera Survey for the Atlantic Sea Scallop
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A view from Scotland's coast.

Tom Dawson

    The Public Historian
    |February 3, 2015
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    Summary
    This summary is machine-generated.

    Coastal erosion threatens heritage sites. The Scottish Coastal Archaeology and the Problem of Erosion (SCAPE) Trust and University of St Andrews

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    Area of Science:

    • Environmental Science
    • Archaeology
    • Climate Change Studies

    Background:

    • Coastal erosion poses a significant threat to cultural heritage globally.
    • Climate change exacerbates coastal erosion, impacting vulnerable sites.
    • Long-term monitoring and public engagement are crucial for heritage management.

    Purpose of the Study:

    • To update coastal erosion surveys through public participation.
    • To identify and implement practical conservation projects at local heritage sites.
    • To enhance public understanding of climate change impacts on coastlines.

    Main Methods:

    • Community-based participatory research.
    • Updating existing coastal surveys with public input.
    • Nomination and execution of local heritage management projects.

    Main Results:

    • Increased public awareness of coastal erosion and climate change effects.
    • Successful implementation of community-led heritage conservation initiatives.
    • Valuable data gathered for informing coastal management decisions.

    Conclusions:

    • Public engagement is vital for effective coastal heritage management.
    • Community-led projects can address local erosion challenges.
    • Integrating public knowledge strengthens coastal heritage preservation efforts.