Toxic equivalency factor (TEF) expresses the toxicity of dioxins, furans and PCBs in terms of the most toxic form of dioxin, 2,3,7,8-TCDD. The toxicity of the individual congeners may vary by orders of magnitude. With the TEFs, the toxicity of a mixture of dioxins and dioxin-like compounds can be expressed in a single number - the toxic equivalency (TEQ). It is a single figure resulting from the product of the concentration and individual TEF values of each congener. The TEF/TEQ concept has been developed to facilitate risk assessment and regulatory control. While the initial and current set of TEFs only apply to dioxins and dioxin-like chemicals (DLCs), the concept can theoretically be applied to any group of chemicals satisfying the extensive similarity criteria used with dioxins, primarily that the main mechanism of action is shared across the group. Thus far, only the DLCs have had such a high degree of evidence of toxicological similarity. There have been several systems over the years in operation, such as the International Toxic Equivalents for dioxins and furans only, represented as I-TEQDF, as well as several country-specific TEFs. The present World Health Organization scheme, represented as WHO-TEQDFP, which includes PCBs is now universally accepted. (Wikipedia).
How to Handle Toxic People Discover The 4 Emotions You Need To Make a Killer First Impression: http://bit.ly/2LFJ3ah Subscribe to Charisma On Command’s YouTube Account: http://bit.ly/COC-Subscribe Hey, guys! Here's another video for you on how to handle toxic people from friends to f
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To learn how you can help in the fight against Dihydrogen Monoxide check out http://www.stevespanglerscience.com/dhmo.html
From playlist April Fool's Day Favorites
Dihydrogen Monoxide - Lethal Everyday Chemical
Dihydrogen Monoxide is a chemical that is available to small children without special permission. It can be lethal in small doses, and causes millions of dollars in damage to the environment and personal property each year. Be careful when dealing with this dangerous chemical.
From playlist April Fool's Day Favorites
To start using Tab for a Cause, go to: http://tabforacause.org/minuteearth2 Burning a marshmallow can release more energy than detonating an equal mass of TNT...so why isn't a marshmallow as dangerous? LEARN MORE ************** To learn more about this topic, start your googling with the
From playlist MinuteEarth
Physics - Thermodynamics 2: Ch 32.7 Thermo Potential (4 of 25) What is Enthalpy?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain enthalpy which is one of the thermodynamic potential. Enthalpy is the amount of heat (energy) absorbed (required) by the system to cause a change in the system, OR the amount of heat expelled
From playlist PHYSICS 32.7 THERMODYNAMIC POTENTIALS
The Power of Poison - Venomous vs. Poisonous
This striking exhibition explored poison's paradoxical roles in nature, human health and history, literature, and myth. Whether as a defense against predators, a source of magical strength, or a lethal weapon used as lifesaving medical treatment, the story of poison is surprising at every
From playlist Past Exhibits
Which Incapacitating Agent is the Most Effective?
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From playlist Chemistry Tierlists
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To learn how you can help in the fight against Dihydrogen Monoxide check out http://www.stevespanglerscience.com/dhmo.html
From playlist April Fool's Day Favorites
Stanford CS224N: NLP with Deep Learning | Winter 2019 | Lecture 19 – Bias in AI
For more information about Stanford’s Artificial Intelligence professional and graduate programs, visit: https://stanford.io/3wFLTVF Professor Christopher Manning, Stanford University & Margaret Mitchell, Google AI http://onlinehub.stanford.edu/ Professor Christopher Manning Thomas M. S
From playlist Stanford CS224N: Natural Language Processing with Deep Learning Course | Winter 2019
Winter School JTP: Homological mirror symmetry for not-so-simple singularities, Yanki Lekili
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Visit http://ilectureonline.com for more math and science lectures! In this video I will gives a definition and examples of enthalpy.
From playlist CHEMISTRY 9 THERMOCHEMISTRY
(November 18, 2009) John Benner, Manager of the National Renewable Energy Laboratory's Electronic Materials and Devices research group, discusses the factors and bottlenecks involved in scaling various photovoltaic technologies to national and international production scales. Stanford U
From playlist Lecture Collection | Energy Seminar
Erik Muller: Dynamic Energy Budget Theory as integrative hub for evaluating organismal [...]
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From playlist Dynamical Systems and Ordinary Differential Equations
Hundreds of Dead Whales Washed Up on the Shore | What On Earth?
A survey plane over Patagonia reveals something truly chilling: hundreds of 50-ton whales littering the shores. Who or what killed them? Stream Full Episodes of What on Earth?: https://www.sciencechannel.com/tv-shows/what-on-earth/ Subscribe to Science Channel: http://bit.ly/SubscribeSci
From playlist What on Earth?
Deafness: Emerging Strategies for a Cure (Stefan Heller, Stanford University)
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From playlist Feature | The Future of Human Health
Thanks to Bespoke Post for sponsoring this video! New subscribers get 20% off their first box of awesome — go to https://bespokepost.com/thatchemist20 and enter code THATCHEMIST20 at checkout. This is the Vitamin Tierlist - vitamins play many important roles in our bodies and the biochemi
From playlist Chemistry Tierlists
RubyConf 2021 - This is not a talk about airplane crashes by Andromeda Yelton
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From playlist Introduction to Green Chemistry, Module 3
A History of Nerve Agents - with Dan Kaszeta
Dan Kaszeta uncovers the development and propagation of nerve agents, the world’s deadliest means of chemical warfare. Dan Kaszeta’s book “Toxic” is available now: https://geni.us/z4N8f From their 1930s invention to the 2018 Novichok attack in Britain, Dan Kaszeta uncovers nerve agents’
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