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関連する概念動画

Shock Waves01:16

Shock Waves

2.0K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Brick Cutting Techniques01:08

Brick Cutting Techniques

136
Brick-cutting techniques involve various tools and methods to shape bricks for construction. A mason's hammer with a chisel-pointed end is used for basic shaping through sharp, precise strikes. For more complex shapes requiring higher precision, a power saw with a water-cooled diamond blade is used.
Cut bricks are categorized by size. Bricks cut to half their original length are called half-bats, while those cut to three-fourths their length are known as three-fourth bats.
Special types of...
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Sound Intensity Level00:53

Sound Intensity Level

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
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Bone Markings01:26

Bone Markings

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Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
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Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

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Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
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Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts
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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

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鋭い発見

Elizabeth A Kellogg1,2

  • 1Donald Danforth Plant Science Center, St. Louis, MO, USA.

Science (New York, N.Y.)
|August 1, 2024
PubMed
まとめ
この要約は機械生成です。

植物の刺さりは 特定の遺伝子によって制御されます これらの遺伝子は重要な植物ホルモン経路である サイトキニンの生合成の最終段階に不可欠です

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科学分野:

  • 植物生物学
  • 遺伝学
  • 分子生物学

背景:

  • 植物の刺は 皮膚から生えてくるもので 保護作用があります
  • 刺 の 発達 に 基づく 遺伝子 や 分子 の 仕組み は 完全 に 理解 さ れ て い ませ ん.
  • サイトキニンの生物合成は,様々な植物成長と発達プロセスに不可欠である.

研究 の 目的:

  • 植物の刺形成の遺伝的制御を調査する.
  • 特定の遺伝子を特定するためです
  • シトキニンの生体合成の役割を解明する.

主な方法:

  • 候補遺伝子を特定するための比較ゲノム解析
  • 遺伝子発現のプロファイルが 刺さった組織に
  • 遺伝子機能の評価のための変異分析
  • サイトキニンの生合成経路の関与を確認するための生化学的測定

主要な成果:

  • 植物の発芽を 制御する遺伝子を特定した
  • これらの遺伝子はシトキニンの生合成の最終段階に関与していることが示された.
  • サイトキニンのレベルと 刺さりの形態の間の直接的な関連が示されました
  • これらの遺伝子の変異により 刺の形成が変化しました

結論:

  • 植物の刺形成は,シトキニンの生物合成経路にある遺伝子によって遺伝的に制御されます.
  • サイトキニンのシグナル伝達が 刺の発達に 重要な役割を果たします
  • この発見は 植物の防御構造とホルモン調節の理解に 新たな道を開きます