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Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Response Surface Methodology01:16

Response Surface Methodology

Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
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Masonry in Cold and Hot Weather Conditions01:21

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Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

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Related Experiment Video

Updated: Jun 6, 2026

Remote Sensing Evaluation of Two-spotted Spider Mite Damage on Greenhouse Cotton
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Published on: April 28, 2017

Shade material evaluation using a cattle response model and meteorological instrumentation.

Roger A Eigenberg1, Tami M Brown-Brandl, John A Nienaber

  • 1US Meat Animal Research Center, USDA-ARS, Clay Center, NE 68933, USA. roger.eigenberg@ars.usda.gov

International Journal of Biometeorology
|November 10, 2010
PubMed
Summary
This summary is machine-generated.

Shade structures effectively reduce heat stress in feedlot cattle. Different shade materials, including polyethylene and snow fence, all significantly lowered stress levels compared to no shade.

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Area of Science:

  • Agricultural Engineering
  • Animal Science
  • Environmental Science

Background:

  • Feedlot cattle experience heat stress, impacting welfare and productivity.
  • Selecting effective shade materials is crucial for mitigating heat stress.
  • Quantifiable data on shade material performance is needed for informed selection.

Purpose of the Study:

  • To estimate the relative effectiveness of various shade materials in reducing heat stress in feedlot cattle.
  • To quantify the impact of different shade structures on thermal load experienced by cattle.

Main Methods:

  • Instrumented shade structures (polyethylene cloth: 100%, 60% reflective, 60% black; poly snow fence: ~30% shade) were tested.
  • Measurements included solar radiation, black globe temperature, ambient temperature, humidity, and wind speed.
  • Data were analyzed using physiological and black globe temperature-based models.

Main Results:

  • All tested shade materials significantly reduced the time cattle spent in the highest stress category.
  • Significant differences (P < 0.05) were observed between all shade materials and the no-shade control.
  • Hourly stress reductions were evident during peak daylight and on full sun days.

Conclusions:

  • Shade structures are a viable method for reducing heat stress in feedlot cattle.
  • All evaluated shade materials demonstrated effectiveness in mitigating thermal stress.
  • Further research can guide optimal shade material selection based on quantified stress reduction.