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関連する概念動画

Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
The Chain Rule01:30

The Chain Rule

A system of interconnected gears provides a concrete physical interpretation of the Chain Rule in calculus. Consider three gears arranged in sequence, where the rotational speeds of the first, second, and third gears are represented by the variables x, z, and y, respectively. The first gear drives the second, and the second drives the third, so the motion of each gear depends on the one preceding it. This structure naturally leads to a two-stage variable relationship that can be analyzed using...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...

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Updated: Jun 14, 2026

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
09:13

Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates

Published on: May 12, 2023

クレタチウムから三次元の移行期です.

C B Officer, C L Drake

    Science (New York, N.Y.)
    |March 25, 1983
    PubMed
    まとめ
    この要約は機械生成です。

    クレータ紀と三次紀の境界線

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    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation
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    Last Updated: Jun 14, 2026

    Getting an A with the 3Cs: Chromosome Conformation Capture for Undergraduates
    09:13

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    Published on: May 12, 2023

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    Inducing the Entry of Third Stage Dispersal Juveniles of Bursaphelenchus xylophilus into Cryptobiosis Through Osmotic Regulation
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    科学分野:

    • パレオントロジー・パレオントロジー
    • 地質学 地質学 地質学
    • 地質化学 地質化学

    背景:

    • クレタセウス-第3期 (K-T) の境界は,地球の歴史における重要な移行をマークし,主要な動物の変化とイリジウム異常によって特徴付けられています.
    • 以前の解釈では,これらのK-T境界現象の主な原因として,地球外の衝突イベントが示唆されていました.
    • 化石記録と地化学データの変動は,K-T移行を理解する上で複雑さを提示します.

    研究 の 目的:

    • K-T境界の動物の変化とイリジウム異常に対する地球外衝突仮説を批判的に評価する.
    • K-T移行期における観測された地質学的および古生物学的記録の代替説明を探求する.
    • 化石の証拠,イリジウムの分布,粘土鉱物学を含む多様なデータを合成し,K-T境界イベントを再評価する.

    主な方法:

    • K-T境界を越えたコアサンプルの化石配列の分析.
    • イリジウムの分布パターンと,様々な場所での貴金属の豊富さの調査.
    • 粘土鉱物学と境界層の粘土における堆積効果の評価.

    主要な成果:

    • 場所と化石の指標に応じて,化石の移行時間と間隔の有意な変動が観察されました.
    • イリジウムの分布,総量,および異なる場所での貴金属の豊富さの正常化における不一致を特定した.
    • 環境の縮小における潜在的堆積効果と境界層における独特の粘土鉱物学を強調した.

    結論:

    • 地球外衝突の仮説は,化石と地化学データの変動のために疑問視されています.
    • 大規模な火山活動,海平面の回帰,そして古気候の変化などの地上の出来事は,K-T境界の変化に対するより妥当な説明を提供します.
    • 多様な地上の現象に関する継続的な研究は,白時代から三次期の移行期を全面的に理解するために極めて重要です.