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相关概念视频

Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...
Volatilization01:10

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
The Sulfur Cycle01:22

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
Rab Cascades01:25

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Efflorescence in Masonry01:25

Efflorescence in Masonry

Efflorescence in masonry walls appears as a fluffy crystalline powder, often white, resulting from water-soluble salts within the masonry or mortar. When water penetrates the masonry, it dissolves these salts and brings them to the surface, where they are deposited upon evaporation of water.
While initial efflorescence is common post-construction and can be cleaned with water and a brush, in certain instances, efflorescence can reappear and gradually diminish over time as salts are leached out...
Saint-Venant's Principle01:18

Saint-Venant's Principle

The principle of Saint-Venant postulates that the stress distribution within a structural member does not rely on the precise method of load application except in the vicinity of the load application points. Consider a scenario where loads are centrally applied on two plates. In this case, the plates move toward each other without any rotation. This movement causes the member to contract in length and expand in width and thickness. Uniform deformation across all elements and maintaining...

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相关实验视频

Updated: Jul 12, 2026

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
07:58

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Published on: August 7, 2017

圣文森特岛上的苏弗里埃火山爆发,1971-1972年

W P Aspinall, H Sigurdsson, J B Shepherd

    Science (New York, N.Y.)
    |July 13, 1973
    PubMed
    概括

    1971-1972年圣文森特的苏弗里埃火山喷发是一个安静的,水下事件. 岩挤出形成了一个岛屿,与爆炸性的1902年喷发形成鲜明对比.

    科学领域:

    • 火山学 火山学是一门学科.
    • 地质地质地质地质地质地

    背景情况:

    • 圣文森特岛上的苏弗里埃尔火山有着大量火山喷发的历史.
    • 之前的火山爆发,比如1902-1903年的火山爆发,是极具爆炸性和破坏性的.

    研究的目的:

    • 为了记录和描述1971-1972年苏弗里埃尔火山爆发的情况.
    • 为了将喷发风格和相关现象与历史喷发进行比较.

    主要方法:

    • 在喷发期间 (1971年10月 - 1972年3月) 收集观测数据.
    • 喷发物质的分析 (岩岩岩).
    • 坑湖浴度和岛屿形成评估.

    主要成果:

    • 大约80 x 10^6 m^3的玄武岩石岩被挤出.
    • 喷发主要是在180米深的火山口湖内潜水.
    • 一个的岛屿从火山口湖中出现.
    • 喷发的特点是温和的喷发式风格,地震活动最小.

    结论:

    • 1971-1972年苏弗里埃尔喷发是一个喷发性,水下事件,与爆炸性喷发不同.

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  • 新岛屿的形成表明,在喷发性火山活动期间,可能会发生重大地形变化.