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689 results on '"Williams, G R"'

4. Poincar\'e duality for $K$-theory of equivariant complex projective spaces

Author

Greenlees, J. P. C. and Williams, G. R.

Subjects
Mathematics - Algebraic Topology, 57R91, 55N15, 55N91
Abstract

We make explicit Poincar\'{e} duality for the equivariant $K$-theory of equivariant complex projective spaces. The case of the trivial group provides a new approach to the $K$-theory orientation., Comment: 17 pages

Published
2007

5. Mapping touch and nociception in the human infant brain

Author

Williams, G. R.

Subjects
618.92
Abstract

Infants often experience clinically-essential painful procedures. The aim of this thesis was to measure, using functional magnetic resonance imaging (fMRI) and electroencephalography (EEG), activation patterns in the infant brain in response to noxious and non-noxious cutaneous stimulation. Using fMRI we assessed somatosensory and nociceptive circuitry in infants undergoing brush, three forces of von Frey, or pinprick stimulation of the foot. First we established optimum parameters and protocols specific for this study. Next, we characterised brain activity and somatotopy, and then considered modulation of activity related to stimulus intensity, stimulus modality, clinically-required sedation, age, and clinical background. Brain regions activated included primary and secondary somatosensory cortices, precuneus, insula, frontal, occipital, motor and cingulate cortices. Activations were somatotopic and di ered according to intensity, modality or clinical background. This is the first study to use fMRI to demonstrate brain activations in response to brush, von Frey hair and pinprick stimulation in human newborn infants. EEG recordings of lance in infants show a noxious-specific deflection at Cz which is not seen in adults undergoing experimental pain. To determine whether this di erence is due to age or stimulus modality we measured EEG activity to lance in healthy adult volunteers. Lance and innocuous tactile stimulations were applied to fifth finger beds, one of which was sensitised with mustard oil. Pain scores were recorded, and verbal descriptors were used to estimate peripheral fibre activation. EEG was compared to infant data collected in a previous study. Brain activity to lance in adults was di erent from control, and was modulated by sensitisation. EEG activity was related to pain score and verbal descriptors. The same stimulation initiated a distinct pattern of activity in infants which di ered from adults. This is the first study to characterise EEG responses to lance in adults, and to compare results with lance in newborn infants.

Published
2013

11. Association between subclinical thyroid dysfunction and change in bone mineral density in prospective cohorts

Author

Segna, D., Bauer, D. C., Feller, M., Schneider, C., Fink, H. A., Aubert, C. E., Collet, T.‐H., da Costa, B. R., Fischer, K., Peeters, R. P., Cappola, A. R., Blum, M. R., van Dorland, H. A., Robbins, J., Naylor, K., Eastell, R., Uitterlinden, A. G., Rivadeneira Ramirez, F., Gogakos, A., Gussekloo, J., Williams, G. R., Schwartz, A., Cauley, J. A., Aujesky, D. A., Bischoff‐Ferrari, H. A., and Rodondi, N.

Published
2018
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14. Recommendations from the ICM-VTE: ShoulderElbow

Author

Namdari, S., Ageno, W., Ahn, J., Becker, L., Blom, A. W., Cancela, N., Chisari, E., Chodor, P., Combs, K. C. R., Cox, R. M., Del Castillo, J. M., Delgado-Martinez, A. D., Demanes, A. C., Donovan, R. L., Egol, K. A., Fioruzzi, A., Goh, G. S., Hall, A. T., Hammoud, S., Kruczynski, J. L., Kunutsor, S. K., Lopez-Cuquerella, L., Navarro, R. A., Parvizi, J., Paul, R. W., Pumberger, M., Randelli, F., Restrepo, C., Roberts, D. C., Rondon, A. J., Socorro, N. E., Tjoumakaris, F. P., Van Raebroeckx, A., Warwick, D. J., Werner, B. C., Whitehouse, M. R., and Williams, G. R.

Subjects
Shoulder, Shoulder Joint, Elbow Joint, Elbow, Humans, Venous Thromboembolism, Orthopedics and Sports Medicine, Surgery, General Medicine
Published
2022

20. Views of Our Readers

Author

Painter, G. H., Majhan, T. J., Anderson, James M., Ashlock, Lawrence, Williams, G. R., Sparks, Guy, Sease, Edmund J., Harper, Robert A., Goldberg, Louis S., Mosolino, William R., Gottfried, Abraham, Feldman, Morton, Hartley, Thomas A., Retting, Harold D., and Heller, Harold

Published
1976

41. The even darker side of the eastern gray squirrel (Sciurus carolinensis): a review of global introductions, invasion biology, and pest management strategies

Author

McAlpine, D. F., Thompson, C. W., Williams, G. R., Koprowski, J. L., Lurz, P. W. W., Bertolino, S., and Huynh, H. M.

Subjects
establishment, introduction, management, non-native, Sciurus carolinensis G., Agriculture, Botany, QK1-989
Abstract

The eastern gray squirrel, Sciurus carolinensis, is one of the world’s most recognized sciurids and a highly successful human commensal. Historically restricted to eastern North America, gray squirrel populations are now established in Italy, U.K., South Africa, and Australia, and squirrels continue to expand their geographic range globally. Successful introductions of S. carolinensis often result in significant negative impacts on native ecosystem integrity. As a result, countries have devised and implemented unique pest management strategies to reduce or eradicate S. carolinensis populations, but with differing levels of success. We review accounts of historical global introductions of S. carolinensis, discuss its invasive biology and impacts in non-native habitats, and recommend specific management strategies that should successfully curtail establishment of this species in non-native habitats.

Published
2011
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