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Related Concept Videos

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.
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...

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Related Experiment Video

Updated: Jul 2, 2026

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
06:23

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation

Published on: March 9, 2018

[Recent development of speciation analysis for trace arsenic].

Zhi-Liang Zhu1, Qin Qin

  • 1State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Aquatic Environment of Ministry of Education of China, Tongji University, Shanghai 200092, China. zzl@mail.tongji.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 30, 2008
PubMed
Summary

Recent advancements in trace arsenic measurement techniques are reviewed, highlighting progress in methods like atomic adsorption spectrometry and inductively coupled plasma-atomic emission spectroscopy. Further research is needed for arsenic speciation analysis and developing efficient separation technologies.

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Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.
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Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.

Published on: September 1, 2017

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

Published on: February 15, 2021

Related Experiment Videos

Last Updated: Jul 2, 2026

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
06:23

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation

Published on: March 9, 2018

Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.
08:21

Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.

Published on: September 1, 2017

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
06:29

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

Published on: February 15, 2021

Area of Science:

  • Analytical Chemistry
  • Environmental Science

Context:

  • Accurate measurement of trace arsenic is crucial for environmental monitoring and human health risk assessment.
  • Existing analytical methods for trace arsenic have limitations, particularly in speciation analysis.

Purpose:

  • To summarize recent developments in trace arsenic measurement techniques.
  • To discuss the characteristics, applications, advantages, and disadvantages of various analytical methods for trace arsenic.
  • To identify challenges and future directions in trace arsenic analysis, especially speciation.

Summary:

  • This paper reviews six key methods for trace arsenic determination: spectrophotometry, atomic adsorption spectrometry, hydride generation atomic fluorescence spectrometry, inductively coupled plasma-atomic emission spectroscopy, X-ray fluorescence spectrometry, and chromatography-atomic characteristic detection.
  • Each method's basic characteristics and application fields are presented, along with a comparative analysis of their strengths and weaknesses.
  • Significant progress has been made in trace arsenic measurement, but speciation analysis remains a challenge, necessitating the development of efficient separation and analysis technologies.

Impact:

  • Provides a comprehensive overview of current trace arsenic analytical methodologies.
  • Highlights the need for advanced techniques in arsenic speciation analysis.
  • Guides future research towards developing more selective and efficient methods for trace arsenic detection and speciation.