Elucidation of these processes will further our understanding of solvation and reactions in multi-phase, multi-component solutions and in determining
reaction mechanisms in heterogeneous systems.
«Clairol — when I was looking for a job, which was in the early 1970s — were starting to do some work in
reaction mechanisms in permanent hair dyes.»
About 10 years ago, chemists discovered a novel
reaction mechanism in dissociation reactions of gas - phase molecules, called roaming.
Not exact matches
I think that kind of
reaction is a defense
mechanism... that people that hate on others beliefs only do so because they lack confidence
in their own beliefs... and have to put others down to feel better about themselves.
However, while it is useful as a heuristic
in developing models of
reaction mechanisms, it has been shown to fail as a criterion for selecting among some selected published models.
If it is true, as I suggest, that salvation lies
in the direction of an Earth organically
in-folded upon itself, it is then surely evident that, though a reciprocal
mechanism of action and
reaction, the vision and prevision of this ultimate end, this outcome of History and of Life, may be made to play an essential part
in the building of the future, if only by creating the atmosphere, the psychic field of attraction, without which it will be impossible for Humanity to continue to converge upon itself.
The detailed sequence of elementary steps (about twenty) which must be involved
in the B - Z
reaction has been worked out by Richard Noyes.11 This
mechanism (called «the Oregonator»
in honor of the location of Noyes's laboratory) is well understood and involves nothing but ordinary chemistry, but it is too involved to discuss here.
Their fight or flight
mechanisms, and one might add their «fright»
reactions, which we now know are built into their very DNA, do indeed seem to imply that a certain degree and type of suffering seems also to be built
in.
However, memorizing chemical equations and
reaction mechanisms for my midterm took much more time than I anticipated, so my pumpkin sat plain and faceless
in the entryway.
ReactIR, Particle Track and Particle Vision enable understanding of
reaction progression,
mechanisms, kinetics, and particle characterisation
in situ and
in real - time for batch and flow chemistry
in lab and plant environments.
This week the State legislature passed and the governor signed into law a far - reaching set of prohibitions, restrictions, and tracking
mechanisms regarding guns, making New York the first state to change its policies
in reaction to the Sandy Hook school shootings.
«The radical - pair
mechanism of magnetoreception is still just a hypothesis, and arguably the best evidence we have for it so far is the effect of time - dependent radiofrequency magnetic fields on the ability of migratory birds to detect the direction of the Earth's magnetic field,» says senior author Peter Hore, an Oxford biophysical chemist specializing
in magnetic influences on chemical
reactions.
In the remaining years of the 20th century, there is no doubt that the experimental investigation of the dynamics and mechanisms of elementary chemical reactions will play a very important role in bridging the gap between the basic laws of mechanics and the real world of chemistr
In the remaining years of the 20th century, there is no doubt that the experimental investigation of the dynamics and
mechanisms of elementary chemical
reactions will play a very important role
in bridging the gap between the basic laws of mechanics and the real world of chemistr
in bridging the gap between the basic laws of mechanics and the real world of chemistry.
The advance
in modern microscopic experimental methods, especially crossed molecular beams and laser technology, has made it possible to explore the dynamics and
mechanisms of important elementary chemical
reactions in great detail.
«My training is
in reaction mechanisms,» explains Keith Brown, who earned a Ph.D.
in organic chemistry from the University of Liverpool and has been working at Clairol for 28 years.
In particular, I got to study how ultrahigh - vacuum techniques could shed light on kinetic, structural, and electronic
mechanisms that govern a catalytic
reaction.
The ORNL - led study instead provides evidence for the second
mechanism,
in which one H atom associates with an O atom to make OH and the other H associates with cerium (Ce) to make CeH — a hydride that may serve as a source of H for industrially important hydrogenation
reactions.
«The question now is how can people
in chemistry create new
reactions, new
mechanisms to use carbon dioxide as a feedstock?»
They're the same symptoms you see
in septic shock and other types of severe inflammatory
reaction, an over-exuberant response from our own protective
mechanisms.
Intrigued by the molecular details of how enzymes worked, he next joined the lab of Michael Toney, where he set out to understand how electrons and protons move during catalysis by analyzing how mutations
in the enzyme's functional site affected the
reaction mechanism.
More specifically, it illustrates that third - person judgment situations, such as those used
in their study, may rely on similar neural
mechanisms as two - person economic and social exchanges, and highlights rDLPFC as a candidate for the neural suppression of impulsive
reactions in these situations.
Chauvin cracked the case
in 1971, and his
mechanism revealed that the metathesis
reaction had the potential to be used for a wide range of
reactions, such as turning linear compounds into rings, stitching linear chains together, and breaking rings open.
To explore the
mechanism of this
reaction, we screened for nucleotides
in Escherichia coli 23S rRNA that may have a perturbed pK a (whereK a is the acid constant) based on the pH dependence of dimethylsulfate modification.
The fact that a rather benign mechanical
mechanism such as a propagating sound field can produce atomic
reactions is a quite remarkable and has attracted considerable scientific attention (see «The Chemical Effects of Ultrasound,» by Kenneth S. Suslick
in Scientific American, Vol.
«
In our sensor
mechanism, we use the same chemistry and enzymatic
reaction that are incorporated into blood glucose testing strips,» Prasad said.
In order to create less expensive electrocatalysts that work well in an alkaline environment, researchers have to know exactly how the reaction unfolds, and what its most essential mechanisms ar
In order to create less expensive electrocatalysts that work well
in an alkaline environment, researchers have to know exactly how the reaction unfolds, and what its most essential mechanisms ar
in an alkaline environment, researchers have to know exactly how the
reaction unfolds, and what its most essential
mechanisms are.
A paper by Yan's research group, published
in the Jan. 8 issue of the multidisciplinary journal Nature Communications, helps pin down the basic
mechanisms of the fuel - cell
reaction on platinum, which will help researchers create alternative electrocatalysts.
Such external pressure comes inter alia from lawmakers and consumer organizations
in different countries, legal
mechanisms and institutions
in different countries that effectively require legal compliance, as well as market
reactions to problematic software license agreements.
The main implication of the work is the understanding of the
mechanisms underlying the formation of biological three - dimensional nano - patterns, demonstrating the first example of Turing
reaction - diffusion model acting
in the bio-nanoworld.
«This «famine
reaction», a survival
mechanism which helped humans to survive as a species when food supply was inconsistent
in millennia past, is now contributing to our growing waistlines when the food supply is readily available.»
More specifically,
in recent decades more than a thousand publications have appeared using this term, including publications
in the journal
Reaction Kinetics,
Mechanisms and Catalysis for which Lente is the Managing Editor (6, 7).
With a deep understanding of the
mechanisms of electrode
reactions in DMFCs, the researchers designed and produced noble metal - based heterogeneous electrocatalysts with enhanced catalytic activity and high selectivity for MOR and ORR.
This shows the
reaction mechanism for converting hydrogen fluoride (HF) impurity from the electrolyte into lithium fluoride (LiF)
in the solid - electrolyte interphase (SEI) with release of hydrogen gas (H2).
The
reaction mechanism is described by the team around Timo Wendling and Prof Dr Lukas Goossen together with a colleague of the Technical University of Kaiserslautern
in the journal Chemistry — A European Journal.
During his years as an assistant professor of chemistry at University of Maryland, Baltimore County, Dietze asked fundamental questions about
mechanisms of basic organic chemical
reactions, questions he recounted
in a recent telephone interview: «How does A go to B?
One of the researchers got to take advantage of his Russian skill since some of the chemistry details necessary for understanding the
reaction mechanism was only available
in an old Russian PhD thesis.
It was
in fact believed that ribozymes resembled the functioning of protein enzymes, but that is not case: the latter
in fact use far more specific methods due to the chemical richness of amino acids, whereas the process
in ribozymes adapts to the skeleton of the RNA that forms them, resulting
in a slightly slower but equally precise
reaction mechanism.»
After deciphering the crystal structure of the catalytic domain of PHA synthase,
in addition to other structural studies on whole enzyme and related proteins, the research team also performed experiments to elucidate the
mechanisms of the enzyme
reaction, validating detailed structures, enzyme engineering, and also N - terminal domain studies among others.
«Also, the new
mechanism may shed light on broader problems»
in chemistry, he said, by providing a deeper understanding fundamental
reaction processes for gold and other catalysts.
The research team found a new
mechanism explaining how this
reaction can occur
in just tens of femtoseconds (quadrillionths of a second), before other competing effects can steal away their energy.
In addition, the study investigated whether Hyssopus officinalis L. was able to increase immune
reactions and thus, may be used to improve and perfect the
mechanisms underlying the treatment of asthma.
We are currently studying the
mechanisms by which telomeres are recruited to these structures and how recombination
reactions, which are normally suppressed at telomeres, are allowed
in the ALT context.
Scientists at Helmholtz Zentrum München have discovered a
mechanism that amplifies the autoimmune
reaction in an early stage of pancreatic islet autoimmunity prior to the progression to clinical type 1 diabetes.
«We're interested
in the
mechanism of the chemical
reaction, with the goal of controlling and steering it
in a certain direction with light,» Schmidt said.
Though this program was very accurate
in describing the shape of large molecules, it was blind to the quantum
mechanisms that drive chemical
reactions.
Kaiser noted that physical chemists, on the other hand, can help shine a light on
reaction mechanisms that can lead to the synthesis of specific molecules
in space.
To cite a few instances, polymerase chain
reaction (PCR), a molecular method developed over three decades ago, has been widely applied
in disease diagnosis, disease
mechanism deciphering, and prognosis prediction; the elucidation of tyrosine kinase activity
in cancer cells has led to the development of novel drugs for cancer treatment; and the identification of proteins and genetic molecules by molecular methods as biomarkers for disease diagnosis and prognosis has been drawing great interest.
Dayne F. Swearer, at Rice University, combines two reactive functions
in one aluminum nanoparticle to unlock new catalytic
mechanisms for known
reactions.
Kinetics and
mechanisms of surface chemical
reactions important
in heterogeneous catalysis
Dr. Peden is best known as a leader
in the development of the
mechanisms of automobile exhaust catalytic
reactions.