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Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Burn injuries occur when the skin and underlying tissues are damaged due to exposure to heat, electricity, chemicals, radiation, or friction. They can vary in severity, from minor superficial burns to severe deep burns that can be life-threatening.
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The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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ディヴェルティキュライト: 概要

Rebecca F Brown1, Kerri Lopez1, Charlotte B Smith2

  • 1Division of Colorectal Surgery, Department of Surgery, University of Maryland, Baltimore.

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まとめ
この要約は機械生成です。

アメリカでは毎年 18万人に 腸炎が起こります 治療法は,合併症のない症例に対する観察から,合併症のダイバーティキュライトに対する抗生物質と手術まで様々です.

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科学分野:

  • 胃腸内科
  • 内科 医学

背景:

  • ダイバーティキュロシスは腸の外皮を巻き込み,ダイバーティキュロシスは腸の炎症である.
  • アメリカでは毎年18万人に感染し 医療費が大きくなります
  • 危険因子には 年齢,遺伝,肥満,特定の薬,慢性疾患などがあります.

研究 の 目的:

  • 発症率,危険因子,診断,治療について概要を述べる.
  • 複雑でないと複雑な ダイバーティキュライトを区別する
  • 病気の重症度と患者要因に基づいて治療戦略を導き出す.

主な方法:

  • 胞炎の疫学,危険因子,臨床表現に関する文献レビュー.
  • コンタスト強化CTスキャンに焦点を当てた診断方法の分析
  • 合併症のない方と合併症のある方に対する現在の管理ガイドラインのレビュー.

主要な成果:

  • アメリカでは10万人に180人が 発症しています
  • コントラスト強化CTは98%以上の感度と99%以上の診断特異性を有する.
  • 患者の85%は 合併症のない状態で 観察と痛みのコントロールで治ります

結論:

  • 合併症のない離炎の治療には,観察と痛みの緩和が含まれます. 抗生物質は特定の患者グループに予約されています.
  • 複合性門炎は 静脈注射の抗生物質と 排水や切除のような 潜在的に侵襲的な処置を必要とします
  • 治療の決定は,疾患の重症度,併発症,全身的な症状に合わせて行われます.