Reaction delay

Type IVb Reactions Delayed Type Hypersensitivity Reactions... 

The simplest design for an enzyme reactor is to merely have the substrate and enzyme in two merging buffer streams followed by a reaction delay coil (Fig. 12). The delay... 

Grewer, T., DECHEMA Monograph, 1980, 88(1818-1835), 21-30 One of the principal causes of batch chemical processes becoming unstable is the combination of a high reaction exotherm and a low reaction rate (or rates if there is more than one component reaction in the overall process). A secondary cause of reaction delay leading to instability is too little mass transfer. To permit safe operation of such reaction systems, the reaction energy (which may be expressed as a dimensionless reaction number) and the reaction rate(s) must be known. The possibility of there being a lower safe limit as well an upper safe limit to reaction temperature is discussed. 

A second spectrum is then taken for which an rf electric field at the frequency appropriate for the mass of the reaction intermediate is applied continuously throughout the same reaction delay as that employed in the first spectrum, taken without this rf electric field. 

Figure 16. Metastable ion cyclotron resonance (MICR) spectra for the unimolecular dissociation of the chemically activated adduct ion derived from association of the methoxymethyl cation with pivaldehyde during a 2-s reaction delay at a pressure of pivaldehyde of 1.0 x 10 torr. The three spectra correspond to values of rf amplitude appropriate to eject transient intermediates with lifetimes longer than (a) 60 ps, (b) 80 ps, and (c) 1 70 ps. A partial pressure of CH4 of 1.0 x 10 torr was also present to thermalize ions. The peak at m/z 125 is a secondary reaction product of m/z 85.

Thrombopoietin is a cytokine that selectively stimulates megakaryocytopoiesis. Thrombopoeitin is not used therapeutically. Theoretical uses include the procurement of platelets for donation and recovery of platelet counts after myelosuppressive chemotherapy. Flowever, a modified recombinant form caused paradoxical reactions, delaying the development of therapeutic thrombopoietin. 

Efficiency of uninterruptible power supply (UPS) or safety power group (reaction delay, activity time)... 

An exothermal decomposition meter, with 100-fold higher sensitivity than DTA is described [2]. The importance of the relationship between reaction energy and reaction rate for batch reactions, and of the factors which may lead to reaction delays and instability, and of secondary reactions, are discussed and exemplified [3]. 

Decibel The unit nsed for the measurement of the intensity of sound on a logarithmic scale based on measurements of sound intensity in watts per square meter and related to a reference. For instance, 10 W/m is the intensity of the quietest sound perceptible to the hnman ear Decomposition The breakdown of chemical snbstances into other substances or parts of componnds nsnally associated with heat or chemical reactions Delayed health effect A disease or an injnry that happens as a resnlt of exposure to chemical substances that might have occnrred in the past Delney clause An amendment enacted in 1958 to the Pnre Food Act that prohibits the addition to food of all detectable amonnts of a carcinogen Dementia (senile dementia) An acqnired progressive impairment of intellectual function... 

Ophthalmic drugs can cause problems of local tolerance, but with variable frequency. They can cause pain on instillation, allergic reactions, delayed healing, punctate keratitis, and disturbances of lacrimal secretion and accommodation. These local problems may be responsible for poor patient adherence to therapy. 

Due to reaction delays as a structural attribute of human information transmission and processing, any attempt to correct deviations becomes effective with a delay and... 

The oscillation fiequencies can be estimated, according to Equation 2, based on the reaction delays for the main feedback loops in human motor control (see Table 4.1). According to this fimctional model, the higher frequency components of the integrated EMG should contain information aboutthe effects of feedback. The components of the integrated EMG that relate directly to the external movement must be of a lower fiequency than the oscillations if feedback... 

Induction Induction of of delayed anti-BPO hypersen-antibody sitivity Anaphylactic reactions Arthus reactions Delayed local in-tradermal reactions... 

It seems that one has to differentiate between the urticarial reaction (immediate reaction) and the eczematous reactions (delayed reactions) (W. Jadassohn, 1932). 

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