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関連する概念動画

Parseval's Theorem01:18

Parseval's Theorem

Parseval's theorem is a fundamental concept in signal processing and harmonic analysis. It asserts that for a periodic function, the average power of the signal over one period equals the sum of the squared magnitudes of all its complex Fourier coefficients. This theorem, named after Marc-Antoine Parseval, provides a powerful tool for analyzing the energy distribution in signals.
Interestingly, Parseval's theorem also holds for the trigonometric form of the Fourier series, which expresses a...
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the designer...
Parabolas01:30

Parabolas

A parabola is a fundamental curve in the family of conic sections arising from the intersection of a plane with a double-napped cone when the plane is parallel to the cone’s slant height. This geometric condition yields a unique open curve defined by its equidistance from a fixed point, the focus, and a fixed line, the directrix.A parabola is mathematically defined as the locus of all points in a plane that are equidistant from the focus and the directrix. In Cartesian coordinates, the standard...
¹H NMR: Pople Notation01:09

¹H NMR: Pople Notation

The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
Theorems of Pappus and Guldinus: Problem Solving01:12

Theorems of Pappus and Guldinus: Problem Solving

Pappus and Guldinus's theorems are powerful mathematical principles that are used for finding the surface area and volume of composite shapes. For example, consider a cylindrical storage tank with a conical top. Finding the surface area or volume can be challenging for such complex shapes. These theorems are particularly useful in calculating the volume and surface area of such systems. Here, the cylindrical storage tank with a conical top can be broken down into two simple shapes: a cylinder...
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...

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Updated: Jun 7, 2026

The Use of the Puzzle Box as a Means of Assessing the Efficacy of Environmental Enrichment
06:50

The Use of the Puzzle Box as a Means of Assessing the Efficacy of Environmental Enrichment

Published on: December 29, 2014

パラミューテーションの性質とパズル

Vicki L Chandler1

  • 1BIO5 Institute, Department of Plant Sciences, University of Arizona, Tucson, AZ 85719, USA. chandler@ag.arizona.edu

Science (New York, N.Y.)
|October 30, 2010
PubMed
まとめ
この要約は機械生成です。

パラミューテーションは,DNA配列が遺伝性遺伝子発現状態を確立するプロセスです. 特定のクロマチンの状態が,非コーディングの繰り返しとRNA誘導サイレンシングを含む,この表遺伝子現象の根底にあると仮定されています.

さらに関連する動画

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

関連する実験動画

Last Updated: Jun 7, 2026

The Use of the Puzzle Box as a Means of Assessing the Efficacy of Environmental Enrichment
06:50

The Use of the Puzzle Box as a Means of Assessing the Efficacy of Environmental Enrichment

Published on: December 29, 2014

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

科学分野:

  • 遺伝学 遺伝学とは
  • エピジェネティクス エピジェネティクス
  • 分子生物学は分子生物学である.

背景:

  • パラミューテーションは,遺伝的な発現状態を確立するためにトランスで通信する同類のDNA配列を含む.
  • パラミューテーションの基礎となる分子メカニズムは,ほとんど不明のままである.
  • 現在の仮説は,特定の染色体状態がパラミューテーションの間に確立され,伝達されることを示唆しています.

研究 の 目的:

  • パラミューテーションの分子基盤を調査するために.
  • パラミューテーション中の遺伝性静止を媒介する特定の分子を特定する.

主な方法:

  • 転写された,コード化されていないタンデムリピートの分析.
  • 植物と酵母菌におけるRNA誘導トランスクリプションサイレンシングに関与するタンパク質の調査.

主要な成果:

  • パラミューテーションには,トランスクリプトされた,非コーディングのタンデムリピートが必要です.
  • RNA誘導による転写サイレンシングに関与するタンパク質は,パラミューテーションに必要である.

結論:

  • パラミューテーションには表遺伝的メカニズムが関与し,おそらくクロマチンの状態によって媒介されます.
  • パラミューテーションにおける遺伝的静音化に起因する正確な分子を特定するために,さらなる研究が必要である.