Synchronization abnormal

The foundations of any turbogenerator installation play a significant part in the safe operation of the machine. Industrial turbines will normally operate at above synchronous speed and will drive an alternator via a reduction gearbox. Any vibration or out of balance occurring under both normal or abnormal operation must be accommodated by the foundations, and their design should therefore best be undertaken by a specialist organization. The layout... 

That an episode arises and spreads from the synchronous as well as excessive discharge of a group of neurons (focus) means that not only must those neurons be in some way predisposed to so discharging but they can also recruit neurons that are otherwise normal. How that discharge manifests itself, i.e. which type of epilepsy occurs, will depend not only on where the abnormal focal neurons are located but also to what extent the activity they initiate can and does spread through the brain. There are consequently a number of different forms of epilepsy, i.e. the epilepsies. 

Convulsions occurred within two hours following occupational exposure to aldrin, dieldrin and endrin (Hoogendam et al. 1962, 1965). After removal from exposure, seizures subsided and complete recovery was achieved in 1-3 days. Abnormal electroencephalograms (EEGs) were usually observed in endrin-poisoned workers, and sometimes occurred without any clinical symptoms. Predominately bilateral synchronous theta waves, and synchronous spike and wave complexes were seen (Hoogendam et al. 

Epilepsy is a chronic brain disease of diverse etiology it is characterized by recurrent paroxysmal episodes of uncontrolled excitation of brain neurons. Involving larger or smaller parts of the brain, the electrical discharge is evident in the electroencephalogram (EEG) as synchronized rhythmic activity and manifests itself in motor, sensory, psychic, and vegetative (visceral) phenomena Because both the affected brain region and the cause of abnormal excitability may differ, epileptic seizures can take many forms. Erom a pharmaco-therapeutic viewpoint, these may be classified as ... 

A series of pilot studies began with multisite pacing for patients with heart failure and dilated cardiomyopathy in the early 1990s [52, 105-111]. An improvement in LV function and symptoms of heart failure were demonstrated. This provided the interest in biventricular pacing for heart failure. The term cardiac resynchronization therapy was coined to refer to pacing therapies that attempt to enhance cardiac performance by using pacing to correct electrical conduction abnormalities in the heart. The most common form of this therapy is atrial-synchronous... 

In epilepsy certain neurons and/or groups of neurons become hyperexcitable and begin firing bursts of action potentials that propagate in a synchronous manner to other brain structures (and in the case of generalized seizures, to practically all areas of the brain). These may be the result of abnormalities in neuronal membrane stability or in the connections among neurons. It is known that the epileptic bursts consist of sodium-dependent action potentials and a calcium-dependent depolarizing potential. 

However, the author believes that the metals in the weathered samples are held in ion exchange positions or as simple salts of the organic matter rather than by chelation, and that the accumulation of these abnormally large amounts of most of the elements was synchronous with the weathing process. Data from these samples suggest that basing minor element distribution in carbonaceous rocks on data from weathering samples could lead to erroneous interpretation. 

Abnormal impulse conduction. The conduction of impulses throughout the myocardium has been interrupted. Various diseases and local damage may result in the delay or failure of an action potential to reach certain areas. These conduction impairments or heart blocks can prevent a smooth and synchronous contraction, thus creating an abnormal rhythm. 

In CONCLUSION, epilepsy is a term used to describe a variety of recurrent symptoms which result from the synchronous or sustained discharge of a group of neurons. It is not clear which specific abnormality in synaptic function is associated with epilepsy, but there is some evidence that an impairment of inhibitory transmission in the neocortex and hippocampus may be primarily involved. The possible causative role of GABA is supported by the fact that many clinically useful anticonvulsants facilitate GABA transmission. Other anticonvulsants may owe their efficacy to their ability to stabilize cation movements across neuronal membranes and /or to affect the phosphorylation of membrane proteins. 

Table 2 shows the EEG recordings before treatment in 12 patients (patient Nos. 1, 3, 4, 6, 7, 10-13, 20, 23, 25) and five patients after treatment (patient Nos. 11, 12, 15, 20, 25). The abnormalities in the EEG recordings of the patients who died were the most severe and consisted of an abnormal ground pattern, some periods of slower high voltage activity, bilateral synchronous with some frontal intermittent recurrent delta activity, sometimes followed by short periods of suppression. After termination of desferrioxamine therapy an... 

Abnormal ground pattern. Delta activity with a maximum bilateral frontoparietal and also bilateral synchronous spikes and triphasic waves ... 

Other presynaptic elements, such as complexins, that dock presynaptic vesicles (Brose, 2008) or syanptotagmin, which may couple Ca2+ entry to rapid vesicle fusion, permitting synchronous presynaptic glutamate release (Maximov and Sudhof, 2005), have not been heavily investigated in schizophrenia. One study has suggested an abnormal interaction between complexin-2 and synapsin-2 in schizophrenia, illustrating the complexity of the potential dysfunctional mechanisms (Lee et al., 2005). 

In organic conductors composed of isolated dimers, the synchronization of ag vibrations in both moieties of the dimer may result in their symmetrical or antisymmetrical vibrations. It is just the antisymmetrical type of vibrations that is capable of coupling to electron oscillations. As a consequence of this interaction, an abnormal optical absorption of the system can be observed. It is polarized in the direction of the dimer s axis and characterized by a frequency close to that of symmetrically vibrating molecules forming a dimer. 

An epileptic seizure is a transient symptom of abnormal, excessive or synchronous neuronal activity in the brain (normal brain activity is marked by unsynchronised firing of neurons). It can manifest as an alteration in mental state, tonic or clonic movements and convulsions. The medical syndrome of recurrent, unprovoked seizures is termed epilepsy, but seizures can occur in people who do not have epilepsy. 

Epileptiform convulsions and abnormal electroencep-halographic patterns have been found in studies of insecticide manufacturing workers suffering from intoxication by isodrin. Fourteen patients with convulsions caused by the insecticide all showed specific anomalies in the electroencephalogram, consisting of bilateral synchronous theta wave activity and occasional bilateral synchronous spike and wave complexes believed to be associated with brain stem injury. 

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