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Applications of the Ideal Gas Law: Molar Mass, Density, and Volume03:43

Applications of the Ideal Gas Law: Molar Mass, Density, and Volume

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The volume occupied by one mole of a substance is its molar volume. The ideal gas law, PV = nRT,  suggests that the volume of a given quantity of gas and the number of moles in a given volume of gas vary with changes in pressure and temperature. At standard temperature and pressure, or STP (273.15 K and 1 atm), one mole of an ideal gas (regardless of its identity) has a volume of about 22.4 L — this is referred to as the standard molar volume.
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What is an Electrochemical Gradient?01:26

What is an Electrochemical Gradient?

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
128.7K
Centrifugation01:05

Centrifugation

8.2K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
8.2K
Atomic Mass01:52

Atomic Mass

70.7K
Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which...
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Centrifugal Force01:06

Centrifugal Force

4.3K
Pseudo forces, or fictitious forces, appear to act on an object in motion in a rotating frame of reference with respect to an inertial reference frame. These forces are not real forces but rather mathematical constructs and are introduced to simplify calculations in a non-inertial frame while using Newton's laws of motion. Common examples of pseudo forces include centrifugal, Coriolis, and Euler forces. These forces are essential in fields such as mechanics, astrophysics, and fluid...
4.3K
Density00:56

Density

20.0K
Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Updated: Feb 15, 2026

Sperm Collection of Differential Quality Using Density Gradient Centrifugation
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マイクロチャネル・グラデント遠心分離を用いた単細胞質量密度測定

Richard Soller1, Per Augustsson2, Rune Barnkob3,4

  • 1Lund University, Department of Biomedical Engineering, Lund, 22363, Sweden.

Scientific reports
|February 13, 2026
PubMed
まとめ
この要約は機械生成です。

私たちは,単細胞質量密度測定の正確なマイクロチャネル方法を開発しました. この技術は高いスループットと手頃な価格を提供し,細胞密度分析をより容易に行うことができます.

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科学分野:

  • バイオフィジックス 生物物理学
  • 細胞生物学 細胞生物学
  • マイクロフリウジック

背景:

  • 単細胞の精密な質量密度測定は,細胞の異質性と機能を理解するために不可欠です.
  • 既存の方法には,大規模分析に必要なスループットや精度が欠けていることが多い.

研究 の 目的:

  • 精密な高通量単細胞質量密度測定のための質量密度梯度離心法のマイクロチャネルベースの適応を提示する.
  • 顕微鏡質量密度読み取りの方法を導入し,その技術の有効性を実証する.

主な方法:

  • マイクロチャネル充填,遠心分離,顕微鏡検査を含むワークフローが採用されました.
  • 一次元の質量密度グラデーションは,瞬時に繰り返し生成されました.
  • カリブレーション粒子とトレーサー分子は,顕微鏡の質量密度読み取りに使用されました.

主要な成果:

  • 単一の酵母細胞の質量密度を測定することが成功しました.
  • この方法は,質量密度測定で3.3%の平均不確実性を達成しました.
  • 時速約16,000個のスループットが実証されました.

結論:

  • マイクロチャネルベースの質量密度梯度離心法は,単細胞分析のための正確な,高通量,かつ手頃な方法である.
  • この技術は,単細胞質量密度測定のアクセシビリティを大幅に向上させます.
  • この方法の頑丈さとシンプルさは,生物学的研究で広く採用されるのに適しています.