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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.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
Seasoning of Wood01:15

Seasoning of Wood

Seasoning of wood is a crucial process aimed at reducing and stabilizing the moisture content within the wood to prevent future shrinkage, structural damage, or aesthetic issues once the wood is used in construction. Wood naturally swells when it absorbs moisture and contracts as it dries.
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
Understanding Sleep01:11

Understanding Sleep

Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...

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Related Experiment Video

Updated: Jun 28, 2026

Assessing the Particulate Matter Removal Abilities of Tree Leaves
05:07

Assessing the Particulate Matter Removal Abilities of Tree Leaves

Published on: October 7, 2018

Dormancy of trees in winter.

T O Perry

    Science (New York, N.Y.)
    |January 8, 1971
    PubMed
    Summary
    This summary is machine-generated.

    Plant dormancy involves multiple stages and processes, including bud formation and cold resistance. Genetic and environmental factors influence dormancy, with distinct physiological changes occurring during early, winter, and after-rest phases.

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    Last Updated: Jun 28, 2026

    Assessing the Particulate Matter Removal Abilities of Tree Leaves
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    Published on: October 7, 2018

    Combining Histochemical Staining and Image Analysis to Quantify Starch in the Ovary Primordia of Sweet Cherry during Winter Dormancy
    07:25

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    Published on: March 20, 2019

    Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
    09:04

    Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

    Published on: August 29, 2019

    Area of Science:

    • Plant physiology
    • Molecular biology
    • Environmental science

    Background:

    • Plant dormancy is a complex adaptive strategy involving cessation of growth and preparation for adverse conditions.
    • It encompasses phenomena like bud formation, cold resistance, and winter rest, influenced by genetic and environmental factors.
    • Dormancy is crucial for plant survival, particularly in temperate climates with seasonal changes.

    Purpose of the Study:

    • To elucidate the multifaceted nature of plant dormancy.
    • To explore the distinct physiological processes occurring during different dormancy phases.
    • To investigate the genetic and environmental influences on dormancy regulation.

    Main Methods:

    • Review of existing literature on plant dormancy.
    • Analysis of physiological and metabolic processes during dormancy.
    • Examination of genetic variation and environmental triggers affecting dormancy.

    Main Results:

    • Dormancy involves distinct phases: early rest, winter rest (chilling requirement), and after-rest, each with unique physiological events.
    • Metabolic processes like respiration, photosynthesis, and enzyme synthesis occur during winter rest.
    • Genetic variability and environmental factors (photoperiod, temperature, nutrients) significantly impact dormancy.

    Conclusions:

    • Plant dormancy is a complex, multi-phase process with partially independent regulatory mechanisms.
    • Environmental cues and genetic factors interact to control dormancy initiation, maintenance, and breaking.
    • A single regulator is unlikely to control all dormancy phenomena; multiple genes and receptors are involved.