1. Cyhoeddwyd

   ‘Mind the gaps’: the accessibility and implementation of an effective depression relapse prevention programme in UK NHS services: learning from mindfulness-based cognitive therapy through a mixed-methods study

   Rycroft-Malone, J., Gradinger, F., Owen Griffiths, H., Anderson, R., Crane, R., Gibson, A., Mercer, S. & Kuyken, W., 8 Medi 2019, Yn: BMJ Open. 9, 9, e026244.

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

2. Cyhoeddwyd

   Accessibility and implementation in UK services of an effective depression relapse prevention programme – mindfulness-based cognitive therapy (MBCT): ASPIRE study protocol

   Rycroft-Malone, J., Anderson, R., Crane, R. S., Gibson, A., Gradinger, F., Owen Griffiths, H., Mercer, S. & Kuyken, W., 24 Mai 2014, Yn: Implementation Science. 9, 62, 62.

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

3. Cyhoeddwyd

   Value associations of irrelevant stimuli modify rapid visual orienting.

   Rutherford, H. J., O'Brien, J. L. & Raymond, J. E., 1 Awst 2010, Yn: Psychonomic Bulletin and Review. 17, 4, t. 536-542

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

4. Cyhoeddwyd

   Match day strategies to enhance the physical and technical performance of rugby players

   Russell, M., Cook, C. J., Kilduff, L. M., Twist, C. (gol.) & Worsfold, P. (gol.), 20 Tach 2014, The Science of Rugby. 2014 gol. Routledge, t. 83-100

   Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

5. Cyhoeddwyd

   A Passive Heat Maintenance Strategy Implemented during a Simulated Half-Time Improves Lower Body Power Output and Repeated Sprint Ability in Professional Rugby Union Players

   Russell, M., West, D. J., Briggs, M. A., Bracken, R. M., Cook, C. J., Giroud, T., Gill, N. & Kilduff, L. P., 18 Maw 2015, Yn: PLoS ONE. 10, 3, t. Article Number: e0119374

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

6. Cyhoeddwyd

   Relationships between match activities and peak power output and Creatine Kinase responses to professional reserve team soccer match-play

   Russell, M., Sparkes, W., Northeast, J., Cook, C. J., Bracken, R. M. & Kilduff, L. P., 23 Tach 2015, Yn: Human Movement Science. 45, t. 96-101

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

7. Cyhoeddwyd

   Changes in acceleration and deceleration capacity throughout professional soccer match-play

   Russell, M., Sparkes, W., Northeast, J., Cook, C. J., Love, T. D., Bracken, R. M. & Kilduff, L. P., 1 Hyd 2016, Yn: Journal of Strength and Conditioning Research. 30, 10, t. 2839-2844

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

8. Cyhoeddwyd

   The between-match variability of peak power output and Creatine Kinase responses to soccer match-play.

   Russell, M., Northeast, J., Atkinson, G., Shearer, D. A., Sparkes, W., Cook, C. J. & Kilduff, L., 26 Ion 2015, Yn: Journal of Strength and Conditioning Research. 29, 8, t. 2079–2085

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

9. Cyhoeddwyd

   Half-Time Strategies to Enhance Second-Half Performance in Team-Sports Players: A Review and Recommendations

   Russell, M., West, D. J., Harper, L. D., Cook, C. J. & Kilduff, L. P., 12 Rhag 2014, Yn: Sports Medicine. 45, 3, t. 353-364

   Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

10. Cyhoeddwyd

    MEDEX 2015: Prophylactic effects of positive expiratory pressure in trekkers at very high altitude.

    Rupp, T., Maufrais, C., Walther, G., Esteve, F., Macdonald, J., Bouzat, P. & Verges, S., 21 Medi 2021, Yn: Frontiers in Physiology. 12, 710622.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

11. Cyhoeddwyd

    Impact of Mindfulness-Based Teacher Training on MBSR Participant Wellbeing Outcomes and Course Satisfaction

    Ruijgrok-Lupton, P. E., Crane, R. & Dorjee, D., Chwef 2018, Yn: Mindfulness. 9, 1, t. 117-128 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

12. Cyhoeddwyd

    Alteration of the Glutamine-Glutamate cycle in Chronic Alcoholism.

    Ruhl, D. A., Gasparovic, C., Mullins, P. G., Yeo, R. A. & Thoma, R. J., 20 Meh 2009.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

13. Cyhoeddwyd

    Building the Bond: Predictors of the Alliance in Neurorehabilitation.

    Rowlands, L., Coetzer, R. & Turnbull, O., 21 Mai 2020, Yn: NeuroRehabilitation. 46, 3, t. 271-285

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

14. Cyhoeddwyd

    This time it’s personal: reappraisal after acquired brain injury

    Rowlands, L., Coetzer, R. & Turnbull, O., 17 Chwef 2021, Yn: Cognition and Emotion. 35, 2, t. 305-323

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

15. Cyhoeddwyd

    Good things better? Reappraisal and discrete emotions in Acquired Brain Injury

    Rowlands, L., Coetzer, B. & Turnbull, O., 25 Tach 2020, Yn: Neuropsychological Rehabilitation. 30, 10, t. 1947-1975

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

16. Cyhoeddwyd

    The effect of type of physical activity measure on the relationship between body fatness and habitual physical activity in children: a meta-analysis

    Rowlands, A. V., Ingledew, D. K. & Eston, R. G., 1 Medi 2000, Yn: Annals of Human Biology. 27, 5, t. 479-497

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

17. Cyhoeddwyd

    Relationship between bone mass and habitual physical activity and calcium intake in 8-11-year-old boys and girls.

    Rowlands, A. V., Powell, S. M., Eston, R. G. & Ingledew, D. K., 1 Tach 2002, Yn: Pediatric Exercise Science. 14, 4, t. 358-368

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

18. Cyhoeddwyd

    Interactive effects of habitual physical activity and calcium intake on bone density in boys and girls.

    Rowlands, A. V., Ingledew, D. K., Powell, S. M. & Eston, R. G., 1 Hyd 2004, Yn: Journal of Applied Physiology. 97, 4, t. 1203-1208

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

19. Cyhoeddwyd

    Effect of stride length manipulation on symptoms of exercise-induced muscle damage and the repeated bout effect.

    Rowlands, A. V., Eston, R. G. & Tilzey, C., 1 Mai 2001, Yn: Journal of Sports Sciences. 19, 5, t. 333-340

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

20. Cyhoeddwyd

    Validation of the RT3 triaxial accelerometer for the assessment of physical activity.

    Rowlands, A. V., Thomas, P. W., Eston, R. G. & Topping, R., 1 Maw 2004, Yn: Medicine and Science in Sports and Exercise. 36, 3, t. 518-524

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

21. Cyhoeddwyd

    Physical activity levels of Hong Kong Chinese children: Relationship with body fat.

    Rowlands, A. V., Eston, R. G., Louie, L., Ingledew, D. K., Tong, K. K. & Fu, F. H., 1 Awst 2002, Yn: Pediatric Exercise Science. 14, 3, t. 286-296

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

22. Cyhoeddwyd

    Effects of ketamine on anterior cingulate glutamate metabolism in healthy humans: A 4-T proton MRS study.

    Rowland, L. M., Bustillo, J. R., Mullins, P. G., Jung, R. E., Lenroot, R., Landgraf, E., Barrow, R., Yeo, R., Lauriello, J. & Brooks, W. M., 1 Chwef 2005, Yn: American Journal of Psychiatry. 162, 2, t. 394-396

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

23. Cyhoeddwyd

    HTA213 Undertaking Studies to Inform Public Policy: Managing Data Collection to Ensure Data Quality in the EQ-5D-5L UK Valuation Through the Use of Independent Quality Control Assessments

    Rowen, D., Mukuria, C., Cooper, S., Bray, N., Carlton, J., Longworth, L., Meads, D., Oluboyede, Y., O'Neill, C. & Yang, Y., 2023, Yn: Value in Health. 26, 12, t. S361

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Crynodeb Cyfarfod

24. Cyhoeddwyd

    A neuroanatomical and cognitive model of impaired social behaviour in frontotemporal dementia

    Rouse, M. A., Binney, R. J., Patterson, K., Rowe, J. B. & Lambon Ralph, M. A., 3 Meh 2024, Yn: Brain. 147, 6, t. 1953-1966 14 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

25. Cyhoeddwyd

    The corpus callosum in schizophrenia-volume and connectivity changes affect specific regions.

    Rotarska-Jagiela, A., Schonmeyer, R., Oertel, V., Haenschel, C., Vogeley, K. & Linden, D., 15 Chwef 2008, Yn: Neuroimage. 39, 4, t. 1522-1532

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

26. Cyhoeddwyd

    Anatomical brain connectivity and positive symptoms of schizophrenia: A diffusion tensor imaging study.

    Rotarska-Jagiela, A., Oertel-Knoechel, V., DeMartino, F., Van de Ven, V., Formisano, E., Roebroeck, A., Rami, A., Schoenmeyer, R., Haenschel, C., Hendler, T., Maurer, K., Vogeley, K. & Linden, D. E., 30 Hyd 2009, Yn: Psychiatry Research - Neuroimaging. 174, 1, t. 9-16

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

27. Cyhoeddwyd

    Dietary nitrate supplementation increases acute mountain sickness severity and sense of effort during hypoxic exercise

    Rossetti, G., Macdonald, J., Wylie, L. J., Little, S., Newton, V., Wood, B., Hawkins, K., Beddoe, R., Davies, H. E. & Oliver, S., Hyd 2017, Yn: Journal of Applied Physiology. 123, 4, t. 983-992

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

28. Cyhoeddwyd

    MEDEX2015: Greater sea-level fitness is associated with lower sense of effort during Himalayan trekking without worse Acute Mountain Sickness

    Rossetti, G., Macdonald, J., Smith, M., Jackson, A., Callender, N., Newcombe, H. K., Storey, H., Willis, S., van den Beukel, J., Woodward, J., Pollard, J., Wood, B., Newton, V., Virian, J., Haswell, O. & Oliver, S., 1 Meh 2017, Yn: High Altitude Medicine and Biology. 18, 2, t. 152-162

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

29. Cyhoeddwyd

    Reversal of neurovascular coupling in the default mode network: Evidence from hypoxia

    Rossetti, G., d'Avossa, G., Rogan, M., Macdonald, J., Oliver, S. & Mullins, P., Ebr 2021, Yn: Journal of Cerebral Blood Flow and Metabolism. 41, 4, t. 805–818 14 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

30. Cyhoeddwyd

    Hypoxia-induced endothelial dysfunction: Could targeting oxidative stress provide protection?

    Rossetti, G., Oliver, S., Sandoo, A. & Macdonald, J., 26 Mai 2023, Yn: Experimental Physiology. 108, 8, t. 1026-1028 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

31. Cyhoeddwyd

    Augensprünge.

    Rosenberg, R., Betz, J. & Klein, C., 1 Ion 2008, Bildwelten des Wissens. Kunsthistorisches Jahrbuch für Bildkritik: Bd. 6. 2008 gol. Akademie Verlag Gmbh, t. 127-129

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

32. Cyhoeddwyd

    World knowledge and novel information integration during L2 Speech comprehension

    Romero-Rivas, C., Corey, J. D., Garcia, X., Thierry, G. L., Martin, C. D. & Costa, A., Mai 2017, Yn: Bilingualism: Language and Cognition. 20, 3, t. 576-587

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

33. Cyhoeddwyd

    Bayesian Reasoning with Emotional Material in Patients with Schizophrenia

    Romero-Ferreiro, V., Susi, R., Sanchez Morla, E. M., Mari-Beffa, P., Rodriguez-Gomez, P., Amador, J., Moreno, E. M., Romero Ferreiro, C., Martinez-Garcia, N. & Rodriguez-Jimenez, R., 3 Tach 2022, Yn: Frontiers in Psychology. 13, 8 t., 6768.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

34. Cyhoeddwyd

    Cognitive versus emotional modulation within a Stroop paradigm in patients with schizophrenia

    Romero-Ferreiro, V., Garcia-Gutierrez, A., Torio, I., Mari-Beffa, P., Rodriguez-Gomez, P., Perianez, J. A., Moreno, E. M., Romero, C., Alvarez-Mon, M. A. & Rodriguez-Jimenez, R., 18 Ion 2023, Yn: British Journal of Psychology. 9, 1, 6 t., e19.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

35. Cyhoeddwyd

    Emotional Processing Profile in Patients with First Episode Schizophrenia: The Influence of Neurocognition

    Romero-Ferreiro, V., Garcia-Fernandez, L., Aparicio, A. I., Martinez-Gtras, I., Dompablo, M., Sanchez-Pastor, L., Rentero, D., Alvarez-Mon, M. A., Espejo Saavedra, J. M., Lahera, G., Mari-Beffa, P., Santos, J. L. & Rodriguez-Jimenez, R., 6 Ebr 2022, Yn: Journal of Clinical Medicine. 11, 7, 8 t., 2044.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

36. E-gyhoeddi cyn argraffu

    The Bangor Gambling Task: Computerized replication and reappraisal of an emotion-based decision task

    Rojas-Líbano, D., Zúñiga, J., Corrales, V., Pino, P., Infante, M., Turnbull, O. H., Bowman, C. & Salas, C., 13 Ion 2023, (E-gyhoeddi cyn argraffu) Yn: Applied Neuropsychology: Adult. 13 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

37. Cyhoeddwyd

    I Want to Help You, But I Am Not Sure Why: Gaze-Cuing Induces Altruistic Giving

    Rogers, R. D., Bayliss, A. P., Szepietowska, A., Dale, L., Reeder, L., Pizzamiglio, G., Czarna, K., Wakeley, J., Cowen, P. J. & Tipper, S. P., Ebr 2014, Yn: Journal of Experimental Psychology: General. 143, 2, t. 763-777

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

38. Cyhoeddwyd

    Gambling as a public health issue in Wales

    Rogers, R., Wardle, H., Sharp, C., Wood, S., Hughes, K., Davies, T., Dymond, S. & Bellis, M., 29 Ion 2019, Bangor University.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn › adolygiad gan gymheiriaid

39. Cyhoeddwyd

    A scoping investigation of eye-tracking in Electronic Gambling Machine (EGM) play

    Rogers, R., Butler, J., Millard, S., Cristino, F., Davitt, L. & Leek, C., 24 Maw 2017, Yn: Gamble Aware . t. 1 41 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

40. Cyhoeddwyd

    Framing a public health approach to gambling harms in Wales: Challenges and opportunities

    Rogers, R., Wardle, H., Sharp, C., Dymond, S., Davies, T., Hughes, K. & Astbury, G., 29 Ion 2019, Bangor University.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn › adolygiad gan gymheiriaid

41. Cyhoeddwyd

    Deep brain stimulation of the subthalamic nucleus transiently enhances loss-chasing behaviour in patients with Parkinson's Disease

    Rogers, R., Rogers, R. D., Wielenberg, B., Wojtecki, L., Elben, S., Campbell-Meiklejohn, D. & Schnitzler, A., 1 Medi 2011, Yn: Experimental Neurology. 231, 1, t. 181-189

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

42. Cyhoeddwyd

    Dissociable effects of basolateral amygdala lesions on decision making biases in rats when loss or gain is emphasized

    Rogers, R., Tremblay, M., Cocker, P. J., Hosking, J. G., Zeeb, F. D., Rogers, R. D. & Winstanley, C. A., 26 Maw 2014, Yn: Cognitive, Affective, and Behavioral Neuroscience. 14, 4, t. 1184-1195

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

43. Cyhoeddwyd

    fMRI evidence for procedural invariance underlying gambling preference reversals.

    Rogers, R., Hinvest, N. S., Bronsan, M. J., Rogers, R. D. & Hodgson, T. L., 3 Maw 2014, Yn: Journal of Neuroscience, Psychology, and Economics. 7, 1, t. 48-63

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

44. Cyhoeddwyd

    Impulsivity and predictive control are associated with suboptimal action-selection and action-value learning in regular gamblers

    Rogers, R., Lim, M. S., Jocham, G., Hunt, L. T., Behrens, T. E. & Rogers, R. D., 15 Tach 2015, Yn: International Gambling Studies. 15, 3, t. 489-505

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

45. Cyhoeddwyd

    Neuropsychological testing of cognitive impairment in euthymic bipolar disorder: an individual patient data meta-analysis

    Rogers, R., Bourne, C., Aydemir, Ö., Balanzá-Martínez, V., Bora, E., Brissos, S., Cavanagh, J. T., Clark, L., Cubukcuoglu, Z., Dias, V. V., Dittmann, S., Ferrier, I. N., Fleck, D. E., Frangou, S., Gallagher, P., Jones, L., Kieseppä, T., Martínez-Aran, A., Melle, I., Moore, P. B., Mur, M., Pfennig, A., Senturk, V., Simonsen, C., Smith, D. J., Bio, D. S., Soeiro-de-Souza, M. G., Stoddart, S. D., Sundet, K., Szöke, A., Thompson, J. M., Torrent, C., Zalla, T., Craddock, N., Andreassen, O. A., Leboyer, M., Vieta, E., Bauer, M., Worhunsky, P. D., Tzagarakis, C., Rogers, R. D., Geddes, J. R. & Goodwin, G. M., 1 Medi 2013, Yn: Acta Psychiatrica Scandinavica. 128, 3, t. 149-162

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

46. Cyhoeddwyd

    Dopamine Modulates Reward Expectancy During Performance of a Slot Machine Task in Rats: Evidence for a ‘Near-miss’ Effect

    Rogers, R., Winstanley, C. A., Cocker, P. J. & Rogers, R. D., 5 Ion 2011, Yn: Neuropsychopharmacology. 36, t. 913-925

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

47. Cyhoeddwyd

    In for a Penny, in for a Pound: Methylphenidate Reduces the Inhibitory Effect of High Stakes on Persistent Risky Choice

    Rogers, R., Campbell-Meiklejohn, D., Simonsen, A., Scheel-Krüger, J., Wohlert, V., Gjerløff, T., Frith, C. D., Rogers, R. D., Roepstorff, A. & Møller, A., 19 Medi 2012, Yn: Journal of Neuroscience. 32, 38, t. 13032-13038

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

48. Cyhoeddwyd

    White matter alterations in antipsychotic- and mood stabilizer-naïve individuals with bipolar II/NOS disorder

    Rogers, R., Yip, S. W., Chandler, R. A., Rogers, R. D., Mackay, C. E. & Goodwin, G. M., 13 Awst 2013, Yn: NeuroImage: Clinical. 3, t. 271-278

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

49. Cyhoeddwyd

    Gambling problems in bipolar disorder in the UK: prevalence and distribution

    Rogers, R., Jones, L., Metcalf, A., Gordon-Smith, K., Forty, L., Perry, A., Lloyd, J., Geddes, J. R., Goodwin, G. M., Jones, I., Craddock, N. & Rogers, R. D., 1 Hyd 2015, Yn: British Journal of Psychiatry. 207, 4, t. 328-333

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

50. Cyhoeddwyd

    The common bipolar phenotype in young people

    Rogers, R., Rock, P. L., Chandler, R. A., Harmer, C. J., Rogers, R. D. & Goodwin, G. M., 1 Hyd 2013, Yn: International Journal of Bipolar Disorders. 1, 19, t. 1-6

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid