関連する実験動画

Updated: Jul 6, 2026

The FlyBar: Administering Alcohol to Flies
10:29

The FlyBar: Administering Alcohol to Flies

Published on: May 18, 2014

オリゴトロフィーと窒素固定は,地中海東部のサプロペルのイベント中に発生します

Sachs1, Repeta

  • 1Department of Environmental Science, Barnard College, Columbia University, 3009 Broadway, New York, NY 10027, USA. Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

Science (New York, N.Y.)
|January 5, 2000
PubMed
まとめ

化石クロロフィルの窒素同位体データは,地中海におけるプレイストセンの終わりのサプロペル形成の間に栄養素が欠乏した表面水と高い窒素固定を示しています. これは,特殊な植物プランクトンの咲きを示唆し,ユートロフィケーションではなく,サプロペルの堆積を助長した.

さらに関連する動画

A Simple Flight Mill for the Study of Tethered Flight in Insects07:42

A Simple Flight Mill for the Study of Tethered Flight in Insects

Published on: December 10, 2015

Building an Enhanced Flight Mill for the Study of Tethered Insect Flight12:09

Building an Enhanced Flight Mill for the Study of Tethered Insect Flight

Published on: March 10, 2021

関連する概念動画

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
States of Matter and Phase Changes00:59

States of Matter and Phase Changes

The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and pressure, that...
Weightlessness01:01

Weightlessness

When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Gas Solubility01:31

Gas Solubility

Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law, which...