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関連する概念動画

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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関連する実験動画

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

冬の樹木の休眠状態

T O Perry

    Science (New York, N.Y.)
    |January 8, 1971
    PubMed
    まとめ

    植物の休眠期には,芽形成と寒冷耐性を含む複数の段階とプロセスが含まれています. 遺伝的および環境的要因は休眠期に影響を与え,初期,冬,休息後の段階で生理学的変化が顕著に表れます.

    科学分野:

    • 植物生理学 植物生理学
    • 分子生物学は分子生物学である.
    • 環境科学 環境科学

    背景:

    • 植物休眠期は,成長の停止と不利な条件への準備を含む複雑な適応戦略です.
    • 芽の形成,耐寒性,冬休憩などの現象を網羅し,遺伝的,環境的要因の影響を受けています.
    • 休眠期は,特に季節の変化のある温帯気候では,植物の生存に極めて重要です.

    研究 の 目的:

    • 植物休眠期の多面的性質を明らかにする.
    • 異なる休眠期間に起こる異なる生理学的プロセスを探求する.
    • 休眠状態の調節に対する遺伝的および環境的影響を調査する.

    主な方法:

    • 植物休眠期に関する既存の文献のレビュー.
    • 休眠期における生理学的および代謝過程の分析.
    • 休眠状態に影響する遺伝的変異と環境的トリガーの検討.

    主要な成果:

    • 休眠状態は,早期の休息,冬休息 (冷やす必要性),および休息後の,それぞれ独特の生理学的イベントを含む,異なる段階を伴う.
    • 呼吸,光合成,酵素合成などの代謝プロセスは,冬休憩中に起こります.
    • 遺伝的変動と環境要因 (光周期,温度,栄養素) は,休眠期に大きく影響する.

    さらに関連する動画

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

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

    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

    関連する実験動画

    Last 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

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

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

    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

    結論:

    • 植物休眠期は,部分的に独立した規制メカニズムを持つ複雑で多段階のプロセスです.
    • 環境的シグナルと遺伝的要因が相互作用し,休眠状態の開始,維持,および断絶を制御する.
    • 単一の調節器がすべての休眠現象を制御することは不可能である;複数の遺伝子と受容体が関与している.