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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Covalently Linked Protein Regulators

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X-linked Traits01:19

X-linked Traits

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Sex-linked Disorders

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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
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テラヘルツの無線接続におけるセキュリティと盗聴

Jianjun Ma1, Rabi Shrestha1, Jacob Adelberg1

  • 1School of Engineering, Brown University, Providence, RI, USA.

Nature
|October 17, 2018
PubMed
まとめ
この要約は機械生成です。

テラヘルツ無線通信のセキュリティは 新しい盗聴方法によって 挑戦されています 狭いビームさえあれば 盗聴器は信号を散らすことができるので 新しい物理層のセキュリティ対策とトランシーバーの設計が必要になります

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科学分野:

  • 電気工学
  • コンピュータ科学
  • 情報セキュリティ

背景:

  • どこにでもいる無線システムには あらゆるレベルの 強力なセキュリティプロトコルが必要です
  • テラヘルツ (THz) 周波数は,より高い方向性を提供し,潜在的にセキュリティを強化します.
  • 既存の高周波無線のセキュリティの仮定は成り立たないかもしれない.

研究 の 目的:

  • テラヘルツ通信の 盗聴の可能性を調査する
  • THz周波数での新しい盗聴技術を特徴づける
  • THzの盗聴に対する 対策を検討し 評価する.

主な方法:

  • 視界のTHz伝送で散乱による信号の傍受を証明する.
  • 物理的な妨害と放射線の拡散を含む盗聴技術の分析.
  • 検知対策としてバックスケーターチャネルの特徴の評価.

主要な成果:

  • 予想に反して,狭いビームを持つTHz信号は,盗聴器によって傍受することができます.
  • THz周波数での盗聴は,送信信号の分散を利用します.
  • バックスキャッターチャネルの特徴は,盗聴の試みの一部を検出できますが,すべてではありません.

結論:

  • テラヘルツのワイヤレスネットワークには 物理層のセキュリティが不可欠です
  • 拡散による盗聴に対する効果的な対策を組み込むために,新しいトランシーバーの設計が必要である.
  • THz周波数での高い方向性による固有のセキュリティの仮定は疑問視されています.