Dr. George Schatz: The Mystery of Colloidal Gold Nanoparticles
ChemTalk
by Alaina Rumrill
2d ago
Nanoparticles In Perspective [Alaina Rumrill] Although nanoparticles have been utilized throughout human history, the term “nanoscience” was not formally used by scientists like Dr. George Schatz until the 1990s [1]. Nanoscience encompasses the study, manipulation, and engineering of matter, particles, and structures on the nanometer scale (1 millionth of a meter) [2]. To grasp the size of a nanoparticle, consider that one human hair is about 60,000 to 100,000 nanometers wide. DNA, by comparison, measures about 2.5 nanometers in diameter, while a person standing at 6 feet 6 inches would span t ..read more
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Allosteric Regulation
ChemTalk
by Caroline Hemphill
1M ago
This diagram shows how an allosteric inhibitor (D) binds to an allosteric site (B) of a protein (E), changing the conformation of its active site (A) and inhibiting substrate (C) binding.Core Concepts In this article, we will learn about allosteric regulation, including allosteric inhibition and allosteric activation. We will look at examples of allosteric regulation in glycolysis. Concepts Covered in Other Articles Enzyme Inhibition Glycolysis: Let’s Break it Down! Cell Metabolism Enzymes- Function and Types What is ATP in Biology? Introduction: Why Do We Need Protein Regulation? Proteins a ..read more
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Amination Reactions
ChemTalk
by Edita Music
1M ago
Core Concepts In this article we will talk about amines and their respective properties, with a focus on the different types of amination reactions that they can participate in. Topics Covered in Other Articles Amine Functional Group Friedel Crafts Acylation and Alkylation Acid Chloride Functional Group Introduction to Amines An amine is a compound or functional group that contains at least a singular Nitrogen atom with a lone pair. Amines are derivatives of ammonia (NH₃) where one or more of the Hydrogen atoms are replaced with another group. Depending on how many Hydrogens are replaced deter ..read more
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The Notable Element Niobium
ChemTalk
by Jakerah Freedah
1M ago
Introduction to Niobium The element niobium is a lustrous, crystalline, and ductile transition metal. Jet engines and both oil and gas pipelines contain niobium.  10 Fun Facts About Niobium Niobium is named after the Greek goddess of tears, Niobe. Niobium is mostly mined in Brazil and Canada. There is enough niobium in the Earth’s crust to last for around 500 years. Most mined niobium is utilized into the steel industry. Niobium is the 34th most abundant element on Earth. Niobium Hydride is valued as a portable source of hydrogen. Niobium is often mistaken as a rare earth metal. A new el ..read more
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Lineweaver-Burk Plot
ChemTalk
by Hannah Desmarais
1M ago
Core Concepts In this article, you will learn about the Lineweaver-Burk plot and its applications to biochemistry topics, specifically that of enzyme kinetics. Topics Covered in Other Articles Enzymes – Function and Types | ChemTalk (chemistrytalk.org) Michaelis-Menten Equation | ChemTalk (chemistrytalk.org) Chemical Kinetics and Rate of Reaction | ChemTalk (chemistrytalk.org) Reaction Rates & How to Determine Rate Law | ChemTalk (chemistrytalk.org) Enzyme Inhibition | ChemTalk (chemistrytalk.org) What Does a Lineweaver-Burk Plot Represent? A Lineweaver-Burk plot, sometimes referred to a ..read more
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Nucleophilic Acyl Substitution
ChemTalk
by Jasmine Winter
1M ago
Core Concepts In this article, we will explore the reaction mechanism of nucleophilic acyl substitutions. Related Articles Nucleophilic Substitution Reaction What is a Nucleophile? Carboxylic Acid Derivatives and their Reactions Carboxylic Acid Functional Group  What is Nucleophilic Acyl Substitution? Nucleophilic acyl substitution is the replacement of the heteroatom of the carboxylic acid derivative’s leaving group with a nucleophile. This type of reaction is used primarily when converting one carboxylic acid derivative species to another less reactive derivative. The replacing nucleo ..read more
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Damià Barceló: How Our Actions Impact Our Water and the Perception of Chemicals
ChemTalk
by Alaina Rumrill
1M ago
The Environmental Impact of Covid-19 [Alaina Rumrill] During the Covid-19 pandemic, the widespread adoption of single-use plastics, such as gloves and masks, had a far-reaching impact that may have been underestimated. Dr. Damià Barceló sheds light on this issue, revealing that the surge in plastic waste, driven by the national consumption of personal protective equipment, posed a significant threat to both organisms and the environment. Numerous studies released during this time exposed the detrimental effects of Covid-19 on enzymes in soil and seawater, underscoring the magnitude of the prob ..read more
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Arrow Pushing
ChemTalk
by Jasmine Winter
1M ago
Core Concepts In this article, we will explore common forms of arrow pushing that are seen in organic chemistry, both intermolecular and intramolecular. We will also consider its uses and importance. Related Articles Resonance structures What are Organic Compounds? Reaction Mechanisms Arrow Pushing Basics Arrow pushing is the process of physically representing the movement of electrons in or between molecules. Electron movement occurs as a result of bond formation, bond breakage, or bond relocation. Electrons may move to form a new bond from an existing lone pair, or vice versa. Typically, a ..read more
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Epoxidation
ChemTalk
by Hannah Desmarais
1M ago
Core Concepts This article gives an introduction to the epoxidation reaction. We will discuss its general concepts, reaction mechanism, and applications in organic chemistry. What is Epoxidation? Epoxidation is a type of reaction that leads to the formation of an epoxide, a cyclic ether with a three-membered ring made up of two carbon atoms and an oxygen atom. This is done through the addition of a singular oxygen atom to an alkene. This addition reaction occurs by breaking the C=C pi bond of the alkene, leading to the formation of two new C-O sigma bonds. Most often, this type of reaction is ..read more
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Sibrina Collins: The Benefits of Storytelling in STEM
ChemTalk
by Alaina Rumrill
1M ago
Storytelling as a Pedagogical Tool Dr. Sibrina Collins offers a unique way to enhance student engagement in STEM classrooms: storytelling. Storytelling is defined as the vivid description of ideas, beliefs, personal experiences, and life lessons through stories or narratives that provoke powerful emotions or insights [1]. While textbooks and traditional lectures may stimulate the intellect, storytelling offers an easy route to the hearts of students. Dr. Collins has found that initiating lectures with topics that relate to students significantly influences attentiveness. She specifically focus ..read more
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