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Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
Social Loafing01:37

Social Loafing

Another way in which a group presence can affect performance is social loafing—the exertion of less effort by a person working together with a group. Social loafing occurs when our individual performance cannot be evaluated separately from the group. Thus, group performance declines on easy tasks (Karau & Williams, 1993). Essentially individual group members loaf and let other group members pick up the slack. Because each individual’s efforts cannot be evaluated, individuals become less...
Microtubule Formation01:23

Microtubule Formation

Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation of...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...

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Updated: May 12, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

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獅子座の"原始的"リング内の巨大な恒星形成.

David A Thilker1, Jennifer Donovan, David Schiminovich

  • 1Center for Astrophysical Sciences, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA. dthilker@pha.jhu.edu

Nature
|February 20, 2009
PubMed
まとめ

巨大なガス雲であるレオのリングは,最近恒星形成の兆候を示しており,それが形成中の矮星銀河である可能性を示唆しています. この発見は,初期の宇宙の銀河形成に関する洞察を提供します. キーワード:獅子座のリング,星形成,矮星銀河,銀河形成.

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Last Updated: May 12, 2026

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10:35

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Published on: February 12, 2013

Spatiotemporal Analysis of Cytokinetic Events in Fission Yeast
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科学分野:

  • 天文学と天体物理学について
  • コスモロジー・コスモロジーとは
  • 銀河の形成と進化について

背景:

  • 銀河間中性原子水素 (H i) 雲は,局所宇宙では稀であり,ごく少数の原始的な例が見つかりました.
  • 巨大な水素構造であるレオのリングは,このような原始雲の候補であり,以前は水素放射によってのみ観測されていました.

研究 の 目的:

  • レオのリングを調査し,恒星集団と恒星形成の証拠を探します.
  • 金属性および形成時間スケールを含む,検出された恒星集団の性質を特徴付ける.

主な方法:

  • 獅子座のリング内のガス基層からの紫外線の検出.
  • 金属性と恒星形成期間を制限するために紫外線可視光度測定の分析.

主要な成果:

  • 獅子座のリングのガス構造の内部で最近の大量恒星が形成されたことを示す紫外線の検出.
  • 観測された紫外線色は,星形成の爆発または中程度の連続星形成 (約. 10^8年) である.
  • フォトメトリーは低金属度モデル (Z約. Z / 50-Z / 5),スペクトロスコピーによる確認が必要です.

結論:

  • 獅子座の環の基底構造は,暗黒物質が欠けている矮星銀河の形成を表している可能性があり,潮矮星銀河に似ているが,事前に濃縮されていない.
  • 初期の宇宙に共通している場合,そのような構造は,検出されていない,薄弱で,金属が少ない,ハローが欠けている矮星銀河の有意な集団を構成する可能性があります.