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関連する概念動画

Cold Weather Concreting01:27

Cold Weather Concreting

358
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
358
Sample Handling01:02

Sample Handling

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Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
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Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
4.1K
Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

329
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...
329
Decreased Body Temperature01:29

Decreased Body Temperature

1000
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
1000
Mass Concreting01:22

Mass Concreting

320
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
320

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冷蔵庫

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まとめ
この要約は機械生成です。

凍った北極の土壌には 古代のウイルスが存在し 過去のパンデミックや 将来の脅威について 洞察を得ることができます この研究は 永久凍土に保存されている 隠されたウイルスの歴史を 探求しています

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科学分野:

  • 環境ウイルス学
  • パレオゲノミクス
  • 北極の微生物

背景:

  • 永久凍土は 北極の広大な地域を覆っています
  • 凍った環境は 自然のタイムカプセルとして 古代の生物学的物質を 保存する可能性があります
  • 永久凍土の中の微生物の生命を理解することは,生態学と健康上のリスクを評価するために極めて重要です.

研究 の 目的:

  • 北極の永久凍土のサンプル内のウイルスの存在と多様性を調査する.
  • 永久凍土が 古代のウイルスの遺伝物質の 貯蔵庫になる可能性を 探求するためです
  • 永久凍土の解凍が ウイルスの放出や公衆衛生に及ぼす影響を評価する.

主な方法:

  • 北極の島々から 永久凍土のサンプルを集めました
  • 土壌内のウイルス配列を特定するためのメタゲノム配列化
  • ウイルスのゲノムを再構成し,多様性を評価するためのバイオ情報分析.

主要な成果:

  • 既知のウイルスと潜在的に新しいウイルスを含む多様なウイルス配列の検出
  • 凍った土壌で長期間保存された ウイルスの遺伝物質の証拠
  • 過去の宿主ウイルス相互作用を示す可能性のあるウイルスシグネチャの識別.

結論:

  • 北極の永久凍土は 古代のウイルスの遺伝情報を 蓄積しています
  • 気候変動による永久凍土の解凍は 古代のウイルスの再出現の 潜在的なリスクをもたらします
  • これらのウイルスとその潜在的な影響の完全な特徴を明らかにするには,さらなる研究が必要です.