Search

Your search keyword '"Rink, J."' showing total 232 results
Start Over Author "Rink, J."
232 results on '"Rink, J."'

5. 1022 Early Cholecystectomy in the Ageing Population

Author

Sturges, P, primary, Gupta, A, additional, Rashid, U, additional, Rupasinghe, SN, additional, Adjepong, S, additional, Parampalli, U, additional, Kirby, GC, additional, Jain, RK, additional, Rink, J, additional, Riera-Portell, M, additional, and Pattar, J, additional

Published
2022
Full Text
View/download PDF

10. Starosele and Starosele child: new excavations, new results

Author

Marks, A.E., Demidenko, Yu E., Monigal, K., Usik, V.I., Ferring, C.R., Burke, A., Rink, J., and McKinney, C.

Subjects
Paleolithic period -- Research, Prehistoric peoples -- Analysis, Excavations (Archaeology) -- Analysis
Published
1997

11. Body size-dependent energy storage causes Kleiber’s law scaling of the metabolic rate in planarians

Author

Thommen, A., Werner, S., Frank, O., Philipp, J., Knittelfelder, O., Quek, Y., Fahmy, K., Shevchenko, A., Friedrich, B. M., Jülicher, F., Rink, J. C., Thommen, A., Werner, S., Frank, O., Philipp, J., Knittelfelder, O., Quek, Y., Fahmy, K., Shevchenko, A., Friedrich, B. M., Jülicher, F., and Rink, J. C.

Abstract

Kleiber’s law, or the 3/4 -power law scaling of the metabolic rate with body mass, is considered one of the few quantitative laws in biology, yet its physiological basis remains unknown. Here, we report Kleiber’s law scaling in the planarian Schmidtea mediterranea. Its reversible and life history-independent changes in adult body mass over 3 orders of magnitude reveal that Kleiber’s law does not emerge from the size-dependent decrease in cellular metabolic rate, but from a size-dependent increase in mass per cell. Through a combination of experiment and theoretical analysis of the organismal energy balance, we further show that the mass allometry is caused by body size dependent energy storage. Our results reveal the physiological origins of Kleiber’s law in planarians and have general implications for understanding a fundamental scaling law in biology.

Published
2019

12. Cytoplasmic pH dynamics in maize pulvinal cells induced by gravity vector changes

Author

Johannes, E, Collings, D. A, Rink, J. C, Allen, N. S, and Brown, C. S

Subjects
Life Sciences (General)
Abstract

In maize (Zea mays) and other grasses, changes in orientation of stems are perceived by pulvinal tissue, which responds to the stimulus by differential growth resulting in upward bending of the stem. The amyloplast-containing bundle sheath cells are the sites of gravity perception, although the initial steps of gravity perception and transmission remain unclear. In columella cells of Arabidopsis roots, we previously found that cytoplasmic pH (pH(c)) is a mediator in early gravitropic signaling (A.C. Scott, N.S. Allen [1999] Plant Physiol 121: 1291-1298). The question arises whether pH(c) has a more general role in signaling gravity vector changes. Using confocal ratiometric imaging and the fluorescent pH indicator carboxy seminaphtorhodafluor acetoxymethyl ester acetate, we measured pH(c) in the cells composing the maize pulvinus. When stem slices were gravistimulated and imaged on a horizontally mounted confocal microscope, pH(c) changes were only apparent within the bundle sheath cells, and not in the parenchyma cells. After turning, cytoplasmic acidification was observed at the sides of the cells, whereas the cytoplasm at the base of the cells where plastids slowly accumulated became more basic. These changes were most apparent in cells exhibiting net amyloplast sedimentation. Parenchyma cells and isolated bundle sheath cells did not show any gravity-induced pH(c) changes although all cell types responded to external stimuli in the predicted way: Propionic acid and auxin treatments induced acidification, whereas raising the external pH caused alkalinization. The results suggest that pH(c) has an important role in the early signaling pathways of maize stem gravitropism.

Published
2001
Full Text
View/download PDF

13. Plant nuclei can contain extensive grooves and invaginations

Author

Collings, D. A, Carter, C. N, Rink, J. C, Scott, A. C, Wyatt, S. E, Allen, N. S, and Brown, C. S

Subjects
Life Sciences (General)
Abstract

Plant cells can exhibit highly complex nuclear organization. Through dye-labeling experiments in untransformed onion epidermal and tobacco culture cells and through the expression of green fluorescent protein targeted to either the nucleus or the lumen of the endoplasmic reticulum/nuclear envelope in these cells, we have visualized deep grooves and invaginations into the large nuclei of these cells. In onion, these structures, which are similar to invaginations seen in some animal cells, form tubular or planelike infoldings of the nuclear envelope. Both grooves and invaginations are stable structures, and both have cytoplasmic cores containing actin bundles that can support cytoplasmic streaming. In dividing tobacco cells, invaginations seem to form during cell division, possibly from strands of the endoplasmic reticulum trapped in the reforming nucleus. The substantial increase in nuclear surface area resulting from these grooves and invaginations, their apparent preference for association with nucleoli, and the presence in them of actin bundles that support vesicle motility suggest that the structures might function both in mRNA export from the nucleus and in protein import from the cytoplasm to the nucleus.

Published
2000
Full Text
View/download PDF

14. Learning to perform: From 'gifts' and 'talents' to skills and creative engagement

Author

Rink, J, Gaunt, H, Williamson, A, Davidson, J, McPherson, G, Rink, J, Gaunt, H, Williamson, A, Davidson, J, and McPherson, G

Abstract

To perform any skilled activity to expert level requires committed and intensely motivated learning. This chapter explores how musical development, particularly as it applies to learning an instrument, depends crucially on inventive and productive opportunities that coalesce in configurations unique to each learner. It reveals how an obsession with gifts and talents on the parts of researchers, teachers, parents and musicians alike has led to confusion over the nature and acquisition of the skills required for high-level music performance. It traces key theories on family scripts and self-determination to illustrate the ways in which psychological constructs shape belief and thus motivate learning. Environmental catalysts such as practice support and opportunity for creative expression offer additional significant influences. These factors are shown to align with intrapersonal characteristics and are described as syzygies, or inventive configurations, that provide pathways to committed music learning.

Published
2017

33. Profiles of rearing tasks

Author

Strijker, J., Rink, J.E., Everts, H, Rink, J E, Strijker, J, Potocarova, M, Potocar, M., and Pedagogiek en Onderwijswetenschap (Nieuwenhuisinstituut)

Published
2004

36. Cross-cultural Orthopedagogy?

Author

Strijker, J., Rink, J E, Strijker, J, Lutje Spelberg, H C, Boersma, C J, and Pedagogiek en Onderwijswetenschap (Nieuwenhuisinstituut)

Published
2003

42. The ASL as an answer to moral panic in the Netherlands

Author

Drost, J.Y., Jonker, A, Ott, W, Rink, J E, Ontwikkelings- en Gedragsstoornissen in Onderwijs en Zorg: Assessment en Interventie, and Pedagogiek en Onderwijswetenschap (Nieuwenhuisinstituut)

Published
2002

Catalog

Books, media, physical & digital resources
See catalog results