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関連する概念動画

Hydraulic Jump: Problem Solving01:16

Hydraulic Jump: Problem Solving

549
To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
549
Hydraulic Jump01:29

Hydraulic Jump

682
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Transgenic Organisms00:53

Transgenic Organisms

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Overview
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Symbiosis00:58

Symbiosis

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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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The Fossil Record02:56

The Fossil Record

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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Taxonomy01:31

Taxonomy

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Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
Hierarchy of Taxonomy
The hierarchy that Carolus Linnaeus first...
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関連する実験動画

Updated: Feb 1, 2026

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
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ジャンピング・スパイダー の 長期 的 な 牛乳 供給

Zhanqi Chen1, Richard T Corlett1, Xiaoguo Jiao2

  • 1Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan, 666303, China.

Science (New York, N.Y.)
|December 1, 2018
PubMed
まとめ

ジャンプするクモは哺乳類のような乳育をしており,幼いクモに栄養のあるミルクを与えます. この無脊椎動物の 乳の供給と 延長された母体ケアは 動物界における これらの特徴の理解を 挑戦しています

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Microdissection of Black Widow Spider Silk-producing Glands
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Microdissection of Black Widow Spider Silk-producing Glands

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科学分野:

  • 動物学
  • 脊椎動物生物学
  • 進化生物学

背景:

  • 授乳は哺乳類の特徴であり,異なるメカニズムを示す哺乳類以外の例はほとんど知られていない.
  • 無脊椎動物の親の介護は多様ですが,通常は牛乳の供給は含まれません.

研究 の 目的:

  • 飛び跳ねるクモの牛乳供給を記録し分析する
  • 哺乳類の授乳と親の介護を比較する.
  • 脊椎動物におけるこれらの行動の 進化的影響を調査する

主な方法:

  • 長い期間,ジャンプスパイダーコロニーを観察する.
  • 母親と子との相互作用の行動分析
  • 牛乳の成分と栄養価の評価 (暗示)

主要な成果:

  • 幼いクモは,母体の上腹部から分泌される栄養のあるミルクを飲み込むことが観察されました.
  • 乳の供給は早期の子孫の生存に不可欠であり,後の食糧調達に補足された.
  • 母親の介護は性的な成熟を超えて,成人の性比に影響を与えました.

結論:

  • 哺乳類のような乳の供給と親の介護は,無脊椎動物で独立して進化した.
  • これらの発見は,哺乳期と親の介護の分布と進化を動物王国全体で再評価する必要があります.
  • 跳躍するクモは 複雑な母子のケア戦略の進化を 研究するための新しいモデルを提供します