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Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
Testing a Claim about Mean: Known Population SD01:11

Testing a Claim about Mean: Known Population SD

A complete procedure of testing the hypothesis about a population mean is explained here.
Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...
Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, 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...
Lagging Strand Synthesis01:59

Lagging Strand Synthesis

During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...

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関連する実験動画

Updated: Jul 11, 2026

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes
06:27

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

Published on: September 4, 2016

プリスタンは動物プランクトンに含まれている.

M Blumer, M M Mullin, D W Thomas

    Science (New York, N.Y.)
    |May 31, 1963
    PubMed
    まとめ
    この要約は機械生成です。

    Calanus finmarchicusのようなプランクトンのコペポッドには,高レベルの原始的な炭化水素が含まれています. これらの甲殻類は,サメやクジラの肝油に含まれるプリスタインの主要な源です.

    さらに関連する動画

    A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter
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    A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter

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    Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers
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    Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

    Published on: April 17, 2018

    関連する実験動画

    Last Updated: Jul 11, 2026

    Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes
    06:27

    Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

    Published on: September 4, 2016

    A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter
    04:39

    A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter

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    Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers
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    Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers

    Published on: April 17, 2018

    科学分野:

    • マリン・バイオロジー マリン・バイオロジー
    • バイオジオケミストリー バイオジオケミストリー

    背景:

    • プリスタンは,海洋生態系で見られる炭化水素です.
    • 海洋食物網における原始の蓄積の源と経路は完全に理解されていません.

    研究 の 目的:

    • 主要な北極のコペポッド種の原始生物の濃度を調査するために.
    • これらのコペポッドが海洋捕食者におけるプリスタインの重要な源であるかどうかを判断する.

    主な方法:

    • Calanus finmarchicus,C. glacialis,C. hyperboreusの体脂肪の原始含有量の分析について
    • コペポッドの原始濃度と,海洋脊椎動物の肝油の既知の濃度の比較.

    主要な成果:

    • 異常な高濃度のプリスタイン (体脂肪の1-3%) は,研究されたコペポッドで発見されました.
    • これらのコペポッドは,海洋捕食者のための実質的な原始的な食事の源を表しています.

    結論:

    • 北極のコペポッド,特にカラヌス種は,サメやクジラの食事における原始性の主要な源である.
    • この発見は,プリスタインの海洋生物ジオケミカルサイクルの重要なステップを明らかにしています.