関連する実験動画
Updated: Jul 20, 2026
07:00
Thermocapillary Convection Space Experiment on the SJ-10 Recoverable Satellite
Published on: March 11, 2020
温度変化: 初期処理現象における基本的な変数?
Science (New York, N.Y.)
|January 5, 1962
まとめ
ネズミの幼年期での取り扱いや寒さへの曝露は,ストレスを受けたときに腎上腺アスコルビック酸のレベルを大幅に低下させます. この臨界期間の体温の低下が,このストレス反応に影響を与える重要な要因であるようです.
科学分野:
- 生理学 生理学とは
- 発達生物学 発達生物学とは
- ストレス反応はストレス反応です.
背景:
- 幼少期の経験は,生物の生理学的発達とストレス反応性に大きな影響を及ぼします.
- アドレナルのアスコルビック酸反応は,ストレス中の下垂体-下垂体-腎上腺 (HPA) 軸の活性に関する重要な指標である.
研究 の 目的:
- ネズミのストレス反応に対する,生命の初期における取り扱いと寒さへの曝露の長期的な影響を調査する.
- 触覚刺激とは無関係な温度低下が,ストレス下での腎上腺アスコルビック酸の枯渇に影響するかどうかを判断する.
主な方法:
- ネズミは,生後1週間の間,操作または寒さ (操作なし) に晒された.
- コントロールグループは,生命の初期に介入を受けなかった.
- アドレナルのアスコルビック酸レベルは,ストレス状態とストレス状態のない大人のラットで測定されました.
主要な成果:
- 生命の初期に操作されたネズミは,コントロールと比較して,ストレスを受けたときに腎上腺アスコルビック酸の有意な減少を示しました.
- 操作せずに低温にさらされたネズミは,ストレス下での腎上腺アスコルビック酸の有意な減少も示した.
- コントロールラットは,この有意な減少を示さなかった.
結論:
- 体の体温を低下させる,手つかずや寒さへの早期の曝露は,ストレスに対する腎上腺アスコルビック酸反応の変化のためにラットにプライムを与えます.
- 新生児期間の体温低下は,ハンドリングがストレス軸の発達に及ぼす影響を媒介する重要な要素である可能性があります.
関連する概念動画
02:44Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
02:55Temperature Dependence on Reaction Rate
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
02:19Le Chatelier's Principle: Changing Temperature
Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
To understand this phenomenon, consider the elementary reaction:
02:28Effect of Temperature Change on Reaction Rate
The Arrhenius equation,
01:28Factors Affecting Body Temperature
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may include:
Factors may include:
01:21Entropy Changes Accompanying Specific Processes
Entropy, a measure of disorder in a system, changes during phase transitions like freezing or boiling. At the transition temperature Ttrs, where two phases are in equilibrium, the phase transition is a reversible process. The entropy change can be calculated from a substance's enthalpy of transition using the equation ΔStrs = ΔtrsH /Ttrs.When a perfect gas expands isothermally from one volume to another, entropy increases logarithmically with volume. Conversely, isothermal compression results...