Search results for: B. Clemens

Items from 1 to 19 out of 19 results

article

EP 64. Altered default mode: resting-state functional connectivity changes in response to social stress

B. Clemens, L. Wagels, M. Bauchmüller, R. Bergs, more

Clinical Neurophysiology > 2016 > 127 > 9 > e276-e277

Up to now it remains unclear how stress in a social context affects the resting human brain, as assessed by functional magnetic resonance imaging (fMRI). Here, we compared for the first time resting-state functional connectivity in a large sample of healthy volunteers before and after the cyberball task. Of primary interest were the salience resting-state network (RSN), the executive control RSN and...

article

Gendergerechte Versorgung von Gewaltopfern

A. Evler, M. Scheller, L. Wagels, R. Bergs, more

Der Nervenarzt > 2016 > 87 > 7 > 746-752

Gewalt ist ein gesellschaftlich hochrelevantes Thema mit häufig enormen Gesundheitsfolgen für die Betroffenen wie auch hohen gesundheitsökonomischen und volkswirtschaftlichen Folgekosten. Bestehende Beratungs- und Hilfsangebote beschränken sich i. d. R. auf ambulante Angebote meist freier Träger oder Vereine. Hierdurch fehlt die Erkennung sowie Versorgung von Patienten mit Gewalterfahrungen im stationären...

article

Valproate treatment normalizes EEG functional connectivity in successfully treated idiopathic generalized epilepsy patients

B. Clemens, S. Puskás, M. Besenyei, N.Zs. Kovács, more

Epilepsy Research > 2014 > 108 > 10 > 1896-1903

To investigate the effect of chronic VPA treatment of EEG functional connectivity in successfully treated idiopathic generalized epilepsy (IGE) patients.19-channel waking, resting-state EEG records of 26 IGE patients were analyzed before treatment (IGE) and after the 90th day of treatment (VPA), in seizure-free condition. Three minutes of artifact-free EEG background activity (without epileptiform...

article

Neurophysiology of juvenile myoclonic epilepsy: EEG-based network and graph analysis of the interictal and immediate preictal states

B. Clemens, S. Puskás, M. Besenyei, T. Spisák, more

Epilepsy Research > 2013 > 106 > 3 > 357-369

The neuronal mechanisms of enduring seizure propensity and seizure precipitation in juvenile myoclonic epilepsy (JME) are not known. We investigated these issues, within the framework of the “network concept” of epilepsy.Design1: 19, unmedicated JME patients were compared with nineteen, age-, and sex-matched normal control persons (NC). A total of 120s, artifact-free, paroxysm-free, eyes-closed, resting...

article

Remission of benign epilepsy with rolandic spikes: An EEG-based connectivity study at the onset of the disease and at remission

B. Clemens, S. Puskás, M. Besenyei, T. Spisák, more

Epilepsy Research > 2013 > 106 > 1-2 > 128-135

The neuronal mechanisms of remission of epilepsy are not known. Based on the principles of the “network theory of epilepsy” we postulated the existence of abnormal cortico-cortical interactions at the onset of epilepsy (Hypothesis-1), and postulated that remission is associated with the decrease or disappearance of the abnormal quantitative EEG findings (Hypothesis-2).Four children with benign epilepsy...

article

EEG-LORETA endophenotypes of the common idiopathic generalized epilepsy syndromes

B. Clemens, S. Puskás, M. Besenyei, M. Emri, more

Epilepsy Research > 2012 > 99 > 3 > 281-292

We tested the hypothesis that the cortical areas with abnormal local EEG synchronization are dissimilar in the three common idiopathic generalized epilepsy (IGE) phenotypes: IGE patients with absence seizures (ABS), juvenile myoclonic epilepsy (JME) and epilepsy with generalized tonic–clonic seizures exclusively (EGTCS).Groups of unmedicated ABS, JME and EGTCS patients were investigated. Waking EEG...

article

EEG background activity is abnormal in the temporal and inferior parietal cortex in benign rolandic epilepsy of childhood: A LORETA study

M. Besenyei, E. Varga, I. Fekete, S. Puskás, more

Epilepsy Research > 2012 > 98 > 1 > 44-49

Benign rolandic epilepsy of childhood (BERS) is an epilepsy syndrome with presumably genetic-developmental etiology. The pathological basis of this syndrome is completely unknown. We postulated that a developmental abnormality presumably results in abnormal EEG background activity findings.20 children with typical BERS and an age- and sex-matched group of healthy control children underwent EEG recording...

article

EEG functional connectivity of the intrahemispheric cortico-cortical network of idiopathic generalized epilepsy

B. Clemens, S. Puskás, M. Bessenyei, M. Emri, more

Epilepsy Research > 2011 > 96 > 1-2 > 11-23

Intrahemispheric, cortico-cortical EEG functional connectivity (fC) was investigated in untreated patients with idiopathic generalized epilepsy (IGE) in this explorative study.Group comparison was carried out between 19, drug-naive IGE patients and 19, matched healthy persons. 90ÿ2s of 19 channels waking, interictal background EEG signal (without epileptiform potentials) were processed to the LORETA...

article

Reversible and irreversible reactions of three oxygen precursors on InAs(0 0 1)-(4×2)/c(8×2)

Jonathon B. Clemens, Ravi Droopad, Andrew C. Kummel

Surface Science > 2010 > 604 > 21-22 > 1859-1868

The substrate reactions of three common oxygen sources for gate oxide deposition on the group III rich InAs(0 0 1)-(4×2)/c(8×2) surface are compared: water, hydrogen peroxide (HOOH), and isopropyl alcohol (IPA). Scanning tunneling microscopy reveals that surface atom displacement occurs in all cases, but via different mechanisms for each oxygen precursor. The reactions are examined as a function of...

article

Quantitative EEG abnormalities in persons with “pure” epileptic predisposition without epilepsy: A low resolution electromagnetic tomography (LORETA) study

S. Puskás, M. Bessenyei, I. Fekete, K. Hollódy, more

Epilepsy Research > 2010 > 91 > 1 > 94-100

Epileptic predisposition means genetically determined, increased seizure susceptibility. Neurophysiological evaluation of this condition is still lacking. In order to investigate “pure epileptic predisposition” (without epilepsy) in this pilot study the authors prospectively recruited ten persons who displayed generalized tonic–clonic seizures precipitated by 24 or more hours of sleep deprivation...

article

Structural and electronic properties of group III Rich In0.53Ga0.47As(001)

Jian Shen, Jonathon B. Clemens, Evgueni A. Chagarov, Darby L. Feldwinn, more

Surface Science > 2010 > 604 > 19-20 > 1757-1766

The structural and electronic properties of group III rich In _0.53 Ga _0.47 As(001) have been studied using scanning tunneling microscopy/spectroscopy (STM/STS). At room temperature (300K), STM images show that the In _0.53 Ga _0.47 As(001)–(4×2) reconstruction is comprised of undimerized In/Ga atoms in the top layer. Quantitative comparison of the In _0.53 Ga ...

article

Theta EEG source localization using LORETA in partial epilepsy patients with and without medication

B. Clemens, M. Bessenyei, I. Fekete, S. Puskás, more

Clinical Neurophysiology > 2010 > 121 > 6 > 848-858

To investigate and localize the sources of spontaneous, scalp-recorded theta activity in patients with partial epilepsy (PE).Nine patients with beginning, untreated PE (Group 1), 31 patients with already treated PE (Group 2), and 14 healthy persons were investigated by means of spectral analysis and LORETA, low resolution electromagnetic tomography (1Hz very narrow band analysis, age-adjusted, Z-scored...

article

Anomalous hybridization in the In-rich InAs(001) reconstruction

Darby L. Feldwinn, Jonathon B. Clemens, Jian Shen, Sarah R. Bishop, more

Surface Science > 2009 > 603 > 22 > 3321-3328

The surface bonding arrangement in nearly all the confirmed reconstructions of InAs(001) and GaAs(001) have only two types of hybridization present. Either the bonds are similar to those in the bulk and the surface atoms are sp ³ hybridized or the surface atoms are in a tricoordinated bonding arrangement and are sp ² hybridized. However, dicoordinated In atoms with sp hybridization...

article

Initial stages of the autocatalytic oxidation of the InAs(001)-(4×2)/c(8×2) surface by molecular oxygen

Jonathon B. Clemens, Sarah R. Bishop, Darby L. Feldwinn, Ravi Droopad, more

Surface Science > 2009 > 603 > 14 > 2230-2239

The initial stages of oxidation of the In-rich InAs(001)-(4×2)/c(8×2) surface by molecular oxygen (O ₂ ) were studied using scanning tunneling microscopy (STM) and density functional theory (DFT). It was shown that the O ₂ dissociatively chemisorbs along the rows in the [110] direction on the InAs surface either by displacing the row-edge As atoms or by inserting between In atoms on...

article

Effect of valproate and lamotrigine in patients with idiopathic generalized epilepsy revealed by LORETA analysis

I. Kondakor, P. Piros, M. Bessenyei, K. Hollody, more

International Journal of Psychophysiology > 2008 > 69 > 3 > 157-158

chapter

Preliminary results from prototype niobium cavities for the JLAB Ampere-class FEL

P. Kneisel, G. Ciovati, R. Bundy, B. Clemens, more

2007 IEEE Particle Accelerator Conference (PAC) > 2487 - 2489

2007 IEEE Particle Accelerator Conference

In a previous paper the cavity [1] design for an Ampere-class cryomodule was introduced. We have since fabricated a 1500 MHz version of a single cell cavity with waveguide couplers for HOM and fundamental power, attached to one end of the cavity, a 5-cell cavity made from large grain niobium without couplers and. a 750 MHz single cell cavity without endgroups to get some information about obtainable...

article

Lamotrigine decreases EEG synchronization in a use-dependent manner in patients with idiopathic generalized epilepsy

B. Clemens, P. Piros, M. Bessenyei, K. Hollódy

Clinical Neurophysiology > 2007 > 118 > 4 > 910-917

To investigate the quantitative EEG effects of lamotrigine (LTG) monotherapy. Hypothesis: LTG was predicted to decrease thalamo-cortical neuronal synchronization in idiopathic generalized epilepsy (IGE).Waking EEG background activity of 19 IGE patients was investigated before treatment and in the course of LTG monotherapy. Raw absolute power (RAP), raw percent power (RRP), and raw mean frequency (RMF)...

article

Orgasmic aura-a report of seven cases

J. Janszky, A. Ebner, Z. Szupera, R. Schulz, more

Seizure: European Journal of Epilepsy > 2004 > 13 > 6 > 441-444

We report on seven patients who experienced an orgasmic aura at the start of their seizures. The patients (five women, two men) were aged 36-58. Three of seven patients described the exact nature of their auras only many years after their appearance, when the epilepsy diagnostic procedure became more intensive due to drug resistance. Moreover, one patient even refused any new therapeutical options...

article

Changing environmental strategies over time: An empirical study of the steel industry in the United States

B. Clemens

Journal of Environmental Management > 2001 > 62 > 2 > 221-231

This study investigates how environmental strategies change over time. We submit evidence from the US steel industry that firms have modified their strategies over time. We offer that US industry passed through three stages — cost minimization, cost-effective compliance, and beneficial environmental controls.We compare typologies of environmental strategies and choose that of C. Oliver as the most...

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