Atomic Absorption Spectroscopy, Principles and Applications
Jan 24, 2024 · The English chemist, Wollaston, was the first to observe dark lines in the solar spectrum that became known as Fraunhofer lines.In 1832, Brewster concluded that atomic vapors in the atmosphere absorbed some of the radiation from the Sun resulting in the detection of these lines. Bunsen and Kirchoff demonstrated soon after that each chemical element had a characteristic color or spectrum when ...
SEM vs TEM - Technology Networks
Jan 24, 2024 · Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) are the two most common types of electron microscopy. TEM and SEM differ in how they work and what types of images they are able to capture. This article will overview SEM and TEM, including what they are, how they work, and how they compare to one another.<br /><br />
An Introduction to Culturing Bacteria - Technology Networks
Jan 24, 2024 · Whichever medium is chosen, this may be in liquid form as a broth culture, or agar may be added to set the media and allow bacterial cells to be grown on a solid surface.. Culture broth. Culture in liquid media, also known as a broth culture, gives the bacteria present easy access to the available nutrients compared to static bacterial colonies.
B Cells, Memory B Cells and Plasma Cells: B Cell Activation ...
Mar 19, 2024 · B cells, also known as B lymphocytes, are immune cells that drive the humoral adaptive immune response.They are one of three types of lymphocyte in the adaptive immune response – the others being T cells and natural killer (NK) cells. 1 B cells are distinguished by their ability to produce antibodies (known as immunoglobulins (Ig) when attached to B cells via a transmembrane domain), and the ...
LC-MS – What Is LC-MS, LC-MS Analysis and LC-MS/MS
Jul 30, 2024 · Coupling liquid chromatography (LC) with mass spectrometry (MS) has provided scientists with a powerful tool to meet stringent analytical demands and their versatility and efficiency means LC-MS instruments have become desirable in many laboratories. In this article, we consider how LC-MS works, what it tells us and highlight some of the technique's strengths and weaknesses.
Agarose Gel Electrophoresis, How It Works and Its Uses
Feb 2, 2024 · Agarose gel electrophoresis is a form of electrophoresis used for the separation of nucleic acid (DNA or RNA) fragments based on their size. Negatively charged DNA/RNA migrates through the pores of an agarose gel towards the positively charged end of the gel when an electrical current is applied, with smaller fragments migrating faster.
Phagocytosis vs Pinocytosis: Definition and Function
Mar 21, 2022 · Examples of phagocytes and phagocytic cells. Phagocytes are a specialized group of cells that perform phagocytosis efficiently. This group includes immune cells such as macrophages, neutrophils and monocytes.Each type of phagocyte has a set of cell surface receptors that can initiate phagocytosis whenever they sense a target particle or pathogen.
Mann-Whitney U Test: Assumptions and Example - Technology …
Mar 25, 2024 · The Mann-Whitney U Test, also known as the Wilcoxon Rank Sum Test, is a non-parametric statistical test used to compare two samples or groups. In this article, we explore the basics of the Test and work through an example.
An Introduction to the Lateral Flow Test: Strengths, Limitations and ...
May 2, 2024 · Diagnostic testing is key in many areas including healthcare and preventative medicine, food safety and environmental monitoring. As such, analysts need appropriate and accurate assays suited to the sample type, analyte and testing environment that respect monetary, time and operator constraints.
GC-MS Principle, Instrument and Analyses and GC-MS/MS
Feb 16, 2024 · The sample mixture is first separated by the GC before the analyte molecules are eluted into the MS for detection. 1 They are transported by the carrier gas (Figure 1 (1)), which continuously flows through the GC and into the MS, where it is evacuated by the vacuum system (6). 1. The sample is first introduced into the GC manually or by an autosampler (Figure 1 (2)) and enters the carrier gas ...