ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

A Dynamic Systems Approach to Understanding Reaching Movements with a Prosthetic Arm (2000)

Wallace, Stephen A. ; Weeks, D. L. ; Foo, P.

Springer

Nonlinear dynamics, psychology, and life sciences 4 (2000), S. 311-338

add to mindlist on the mindlist

Details

ISSN: 1573-6652

Keywords: dynamical systems ; artificial limbs ; motor coordination

Source: Springer Online Journal Archives 1860-2000

Topics: Psychology

Notes: Abstract A case study was conducted on an experienced upper extremity prosthetic user that required him to perform a reaching and grasping task with both his prosthetic and normal anatomical hand. We used a scanning task (Wallace, Stevenson, Spear, & Weeks, 1994; Button, Bennett, & Davids, 1998) that required the participant to perform a wide range of coordination patterns defined by the relative phasing between the aperture of the fingers (or artificial prehensor) and the arm. Visual templates of the required finger trajectories in the various required phase conditions served as environmental information for the subject to follow. Based on previous work, we hypothesized that the participant would exhibit at least one stable reaching and grasping pattern in both his anatomical and prosthetic arm. In support of this hypothesis, the results showed a negative sloping relationship between the required relative phase and the mean delta relative phase (required relative phase minus the actual relative phase). The smallest delta relative phase occurred at approximately 80° and 115° relative phase for the anatomical and prosthetic arm, respectively during the scanning task. These results confirm our previous work of the presence of only one attractor in reaching and grasping movements using either the anatomical or prosthetic arm.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009536223675

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Induction of heat labile alkaline phosphatase by butyrate in differentiating endometrial cells (1995)

Fleming, Honoree ; Begley, Michael ; Campi, Thomas ; [et al.]

New York, N.Y. : Wiley-Blackwell

Journal of Cellular Biochemistry 58 (1995), S. 509-516

add to mindlist on the mindlist

Details

ISSN: 0730-2312

Keywords: alkaline phosphatase ; Ishikawa endometrial cells ; butyrate ; differentiation ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: The addition of 2mM sodium butyrate to monolayers enhances differentiation of Ishikawa endometrial cells. Cells from this cell line have been shown to enlarge and lift off the dish into dome structure over a period of 24-48 h in response to a factor in fetal bovine serum (FBS) [Fleming, 1995 J Cell Biochem in press]. When butyrate is added to monolayers, together with FBS, three- to fourfold higher numbers of differentiated structures, domes and predomes, can be counted. It had previously been shown [Holinka et al., 1986b] that estradiol induces heat stable placental alkaline phosphatese in lshikawa cells. The addition of butyrate, on the other hand, results in a significant increase in levels of a heat labile alkaline phosphatase isozyme. The heat labile isozyme is also increased to some extent in cells stimulated to differentiate in response to FBS in the absence of butyrate. Differential inhibition by homoarginine and phenylalanine indicates that butyrate is inducing the liver-bone kidney isozyme that is found in endometrial glands in vivo.

Additional Material: 4 Ill.