TY  - JOUR
A1  - Volohonsky, Gloria
A1  - Tuby, Chen N. Y. H.
A1  - Porat, Noga
A1  - Wellman-Rousseau, Maria
A1  - Visvikis, Athanase
A1  - Leroy, Pierre
A1  - Rashi, Sharon
A1  - Steinberg, Pablo
A1  - Stark, Avishay Abraham
T1  - A spectrophotometric assay of gamma-glutamylcysteine synthetase and glutathione synthetase in crude extracts from tissues and cultured mammalian cells
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Fiehler, Katja
A1  - Bannert, Michael M.
A1  - Bischoff, Matthias
A1  - Blecker, Carlo
A1  - Stark, Rudolf
A1  - Vaitl, Dieter
A1  - Franz, Volker H.
A1  - Roesler, Frank
T1  - Working memory maintenance of grasp-target information in the human posterior parietal cortex
JF  - NeuroImage : a journal of brain function
N2  - Event-related functional magnetic resonance imaging was applied to identify cortical areas involved in maintaining target information in working memory used for an upcoming grasping action. Participants had to grasp with their thumb and index finger of the dominant right hand three-dimensional objects of different size and orientation. Reaching-to-grasp movements were performed without visual feedback either immediately after object presentation or after a variable delay of 2-12 s. The right inferior parietal cortex demonstrated sustained neural activity throughout the delay, which overlapped with activity observed during encoding of the grasp target. Immediate and delayed grasping activated similar motor-related brain areas and showed no differential activity. The results suggest that the right inferior parietal cortex plays an important functional role in working memory maintenance of grasp-related information. Moreover, our findings confirm the assumption that brain areas engaged in maintaining information are also involved in encoding the same information, and thus extend previous findings on working memory function of the posterior parietal cortex in saccadic behavior to reach-to-grasp movements.
Y1  - 2011
U6  - https://doi.org/10.1016/j.neuroimage.2010.09.080
SN  - 1053-8119
VL  - 54
IS  - 3
SP  - 2401
EP  - 2411
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Theves, Matthias
A1  - Taktikos, J.
A1  - Zaburdaev, V.
A1  - Stark, H.
A1  - Beta, Carsten
T1  - Random walk patterns of a soil bacterium in open and confined environments
JF  - epl : a letters journal exploring the frontiers of physics
N2  - We used microfluidic tools and high-speed time-lapse microscopy to record trajectories of the soil bacterium Pseudomonas putida in a confined environment with cells swimming in close proximity to a glass-liquid interface. While the general swimming pattern is preserved, when compared to swimming in the bulk fluid, our results show that cells in the presence of two solid boundaries display more frequent reversals in swimming direction and swim faster. Additionally, we observe that run segments are no longer straight and that cells swim on circular trajectories, which can be attributed to the hydrodynamic wall effect. Using the experimentally observed parameters together with a recently presented analytic model for a run-reverse random walker, we obtained additional insight on how the spreading behavior of a cell population is affected under confinement. While on short time scales, the mean square displacement of confined swimmers grows faster as compared to the bulk fluid case, our model predicts that for large times the situation reverses due to the strong increase in effective rotational diffusion.
Y1  - 2015
U6  - https://doi.org/10.1209/0295-5075/109/28007
SN  - 0295-5075
SN  - 1286-4854
VL  - 109
IS  - 2
PB  - EDP Sciences
CY  - Mulhouse
ER  - 
TY  - JOUR
A1  - Komlosh, A.
A1  - Volohonsky, Gloria
A1  - Porat, Noga
A1  - Tuby, chen n. y. h.
A1  - Bluvshtein, Evgenia
A1  - Steinberg, Pablo
A1  - Oesch, Franz
A1  - Stark, Avishay Abraham
T1  - Gamma-glutamyl transpeptidase and glutathione biosynthesis in non-tumorigenic and tumorigenic rat liver oval cell lines
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Louis, Alfred K.
A1  - Maaß, Peter
A1  - Rieder, Andreas
A1  - Stark, H.-G.
T1  - Wavelets and digital image processing
Y1  - 1994
ER  -