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Overview of Algae01:28

Overview of Algae

The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
Other Algae01:19

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
Red Algae01:23

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

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アルゴール系にある大きな冠状回路.

W M Peterson1, R L Mutel, M Güdel

  • 1Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, Iowa 52240, USA.

Nature
|January 16, 2010
PubMed
まとめ
この要約は機械生成です。

ラジオ画像は,KIV亜巨星から発生した,アルゴルの二重星系で,大きく,持続的な冠状のループを明らかにしています. この構造は予想以上に大きく,2つの星間の強い磁気相互作用を示唆しています.

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Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer
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07:23

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Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer
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科学分野:

  • * 天体物理学
  • * 星の天文学 星の天文学
  • * マグネトヒドロダイナミクス

背景:

  • * アルゴル系は,KIV亜巨星とB8メインシーケンス恒星からなる密接なバイナリ系です.
  • * 軌道周期に恒星回転の潮鎖が磁力ダイナモを駆動する.
  • *証拠は,KIV亜巨星の周りに複雑な磁気圏があることを示唆しているが,その形態学と相互作用は十分に理解されていない.

研究 の 目的:

  • * アルゴール系におけるKIV亜巨星のコロナの形態を調査する.
  • * 冠状プラズマと同伴星B8の相互作用を理解するために.
  • * 磁気圏の構造と持続性を決定する.

主な方法:

  • * アルゴル系のマルチエポック無線画像.
  • * 恒星の磁場構造と冠状のプラズマ収束の分析.

主要な成果:

  • * 大規模で持続的な冠状回路の観測,直径約1つの亜巨大高さ.
  • *ループの底は亜巨星上にあり,その頂点はB8星に向けられている.
  • *観測されたループは理論的に予測されたより大きく,潜在的な磁気相互作用を示しています.

結論:

  • * 恒常的で非対称な磁場構造が,アルゴル星系内の2つの星の間に並べられている.
  • *観測された冠状回路の大きさは,亜巨星と同伴星との間に有意な磁気相互作用があることを示唆しています.
  • *この発見は,近い二重星系における恒星の磁気圏に関する既存の理論モデルに異議を唱えている.