Prifysgol Bangor

  1. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  2. Cyhoeddwyd

    Ab initio conformational analysis of an N- an C-terminally-protected valyl-alanine dipeptide model

    Chasse, G. A., Chun, C. P., Connor, A. A. & Chass, G. A., 30 Medi 2005, Yn: Journal of Molecular Structure: THEOCHEM. 729, 3, t. 177-184

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Abacavir hypersensitivity: Is pre-prescription genotyping cost-effective?

    Hughes, D., Hughes, D. A. & Pirmohamed, M., 1 Tach 2003, Yn: Value in Health. 6, 6, t. 749

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    Abandoning or Reimagining a Cultural Heartland? Understanding and Responding to Rewilding Conflicts in Wales - the case of the Cambrian Wildwood.

    Wynne-Jones, S., Holmes, G. & Strouts, G., 1 Awst 2018, Yn: Environmental Values. 27, 4

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    Abandonment of the doctrine of attribution in favour of the gross negligence test in the Corporate Manslaughter and Corporate Homicide Act 2007

    Hsiao, M. W., 1 Ebr 2009, Yn: Company Lawyer. 30, 4, t. 110-112

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Aberrant disgust response and immune reactivity in cocaine-dependent men might uncover deranged serotoninergic activity

    Vicario, C. M., 11 Chwef 2014, Yn: Frontiers in Molecular Neuroscience. 7

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Abiotic and biotic controls of soil dissolved organic nitrogen along a precipitation gradient on the Tibetan plateau

    Jiang, L., Wang, S., Pang, Z., Wang, C., Meng, F., Lan, Z., Zhou, X., Li, Y., Zhang, Z., Luo, C., Jones, D. L., Rui, Y. & Wang, Y., Chwef 2021, Yn: Plant and Soil. 459, 1-2, t. 65-78

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Able to name, unable to compare: the visual abilities of a posterior split-brain patient

    Intriligator, J. M., Intriligator, J., Henaff, M. A. & Michel, F., 1 Awst 2000, Yn: Neuroreport. 11, 12, t. 2639-2642

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Abnormal cortical complexity and thickness profiles mapped in Williams syndrome.

    Thompson, P. M., Lee, A. D., Dutton, R. A., Geaga, J. A., Hayashi, K. M., Eckert, M. A., Bellugi, U., Galaburda, A. M., Korenberg, J. R., Mills, D. L., Toga, A. W. & Reiss, A. L., 20 Ebr 2005, Yn: Journal of Neuroscience. 25, 16, t. 4146-4158

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Abnormalities in visual processing lead to hypersociability and evaluation of trust: An ERP study of Williams syndrome

    Shore, D., Ng, R., Bellugi, U. & Mills, D., Hyd 2017, Yn: Cognitive, Affective and Behavioural Neuroscience. 17, 5, t. 1002-1017 16 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Abolition of prescription charges in Wales: the impact on medicines use in those who used to pay

    Hughes, D., Groves, S., Cohen, D., Alam, M. F., Dunstan, F. D., Routledge, P. A., Hughes, D. A. & Myles, S., 1 Rhag 2010, Yn: International Journal of Pharmacy Practice. 18, 6, t. 332-340

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Abolition of prescription copayments in Wales: an observational study on dispensing rates.

    Hughes, D., Cohen, D., Alam, M. F., Dunstan, F. D., Myles, S., Hughes, D. A. & Routledge, P. A., 1 Awst 2010, Yn: Value in Health. 13, 5, t. 675-680

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. E-gyhoeddi cyn argraffu

    Abortion in French cinema during the long 1960s and beyond

    Hallet, M. & Miller, E., 23 Rhag 2023, (E-gyhoeddi cyn argraffu) Yn: Modern and Contemporary France. 17 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    About millenials, new technology and researching business organizations

    Batiz-Lazo, B., Meh 2016, Yn: Journal of Evolutionary Studies in Business. 1, 1, t. 152-156

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Above-below surface interactions mediate effects of seagrass disturbance on meiobenthic diversity, nematode and polychaete trophic structure

    Nascimento, F. J. A., Dahl, M., Deyanova, D., Lyimo, L. D., Bik, H. M., Pereira, T. J., Bjork, M., Creer, S. & Gullstrom, M., 4 Hyd 2019, Yn: Communications Biology. 2, 362.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Aboveground biomass density models for NASA’s Global Ecosystem Dynamics Investigation (GEDI) lidar mission

    Duncanson, L., Kellner, J. R., Armston, J., Dubayah, R., Minor, D. M., Hancock, S., Healey, S. P., Patterson, P. L., Saarela, S., Marselis, S., Silva, C. E., Bruening, J., Goetz, S. J., Tang, H., Hofton, M., Blair, B., Luthcke, S., Fatoyinbo, L., Abernethy, K., Alonso, A., Andersen, H.-E., Aplin, P., Baker, T. R., Barbier, N., Bastin, J. F., Biber, P., Boeckx, P., Bogaert, J., Boschetti, L., Boucher, P. B., Boyd, D. S., Burslem, D. F. R. P., Calvo-Rodriguez, S., Chave, J., Chazdon, R. L., Clark, D. B., Clark, D. A., Cohen, W. B., Coomes, D. A., Corona, P., Cushman, K. C., Cutler, M. E. J., Dalling, J. W., Dalponte, M., Dash, J., de-Miguel, S., Deng, S., Ellis, P. W., Erasmus, B., Fekety, P. A., Fernandez-Landa, A., Ferraz, A., Fischer, R., Fisher, A. G., García-Abril, A., Gobakken, T., Hacker, J. M., Heurich, M., Hill, R. A., Hopkinson, C., Huang, H., Hubbell, S. P., Hudak, A. T., Huth, A., Imbach, B., Jeffery, K. J., Katoh, M., Kearsley, E., Kenfack, D., Kljun, N., Knapp, N., Král, K., Krůček, M., Labrière, N., Lewis, S. L., Longo, M., Lucas, R. M., Main, R., Manzanera, J. A., Martínez, R. V., Mathieu, R., Memiaghe, H., Meyer, V., Mendoza, A. M., Monerris, A., Montesano, P., Morsdorf, F., Næsset, E., Naidoo, L., Nilus, R., O’Brien, M., Orwig, D. A., Papathanassiou, K., Parker, G., Philipson, C., Phillips, O. L., Pisek, J., Poulsen, J. R., Pretzsch, H., Rüdiger, C., Saatchi, S., Sanchez-Azofeifa, A., Sanchez-Lopez, N., Scholes, R., Silva, C. A., Simard, M., Skidmore, A., Stereńczak, K., Tanase, M., Torresan, C., Valbuena, R., Verbeeck, H., Vrska, T., Wessels, K., White, J. C., White, L. J. T., Zahabu, E. & Zgraggen, C., 2022, Yn: Remote Sensing of Environment. 270

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Aboveground carbon sequestration of Cunninghamia lanceolata forests: Magnitude and drivers

    Wang, C., Liu, S., Zhu, Y., Smith, A., Ning, Y. & Deng, D., 24 Ion 2024, Yn: Forest Ecosystems. 100165.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Absalom fy Mab (1957) Cynan: troednodyn yn hanes y ddrama Gymraeg

    Wiliams, G., Hyd 2018, Yn: Llên Cymru. 41, t. 118-146

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Absence of Escherichia coli 0157:H7 in sheep and cattle faeces in North Wales

    Alhefli, N. A., Adam, H., Jones, D. & Williams, P., 10 Awst 2013, Yn: Veterinary Record. 173, 6, t. 143-143

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Absence of gaze direction effects on EEG measures of sensorimotor function.

    Hesse, C. W., Seiss, E., Bracewell, R. M. & Praamstra, P., 1 Ion 2004, Yn: Clinical Neurophysiology. 115, 1, t. 29-38

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Absenteeism, seasonality and the business cycle

    Goddard, J. A., Audas, R. & Goddard, J., 1 Gorff 2001, Yn: Journal of Economics and Business. 53, 4, t. 405-419

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Absolute chronologies from the ocean: records from the longest-lived, non-colonial animals on Earth.

    Wanamaker, A. D., Scourse, J. D., Richardson, C. A., Butler, P., Reynolds, D. & Ridgway, I., 1 Awst 2008, Yn: PAGES News. 16, t. 4-6

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Absorption of Volatile Organic Compounds by Different Wool Types

    Mansour, E., Curling, S. F., Stéphan, A. & Ormondroyd, G. A., Maw 2016, Yn: Green Materials. 4, 1

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  24. Cyhoeddwyd

    Abstract images and words can convey the same meaning

    Kuipers, J. R., Jones, M. W. & Thierry, G., 8 Mai 2018, Yn: Scientific Reports. 8, 7190.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    Abu Dhabi Goes Green

    Rawlings Smith, E., Ebr 2012, Yn: Geography Review. 25, 4, t. 2-5 4 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Abundance and Distribution of Enteric Bacteria and Viruses in Coastal and Estuarine Sediments—a Review

    Hassard, F., Gwyther, C. L., Farkas, K., Andrews, A., Jones, V., Cox, B., Brett, H., Jones, D., McDonald, J. & Malham, S., 1 Tach 2016, Yn: Frontiers in Microbiology.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Abundance and distribution of the harbour porpoise (Phocoena phocoena) on the north coast of Anglesey, Wales, UK.

    Shucksmith, R., Jones, N. H., Stoyle, G. W., Davies, A. J. & Dicks, E. F., 1 Awst 2009, Yn: Journal of the Marine Biological Association of the United Kingdom. 89, 5, t. 1051-1058

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Abundance and reproduction of Nilsson's pipefish on tidal flats.

    Hiddink, J. G. & Jager, Z., 1 Rhag 2002, Yn: Journal of Fish Biology. 61, Supplement A, t. 125-137

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. E-gyhoeddi cyn argraffu

    Abundance, distribution and characteristics of microplastics in the North and South Atlantic Ocean

    Andersen, R., Harsaae, A. L., kellner, A., Smyth, A., Rosenkrantz Westermann, T. A., Green, M., Vollertsen, J., Syberg, K. & Lorenz, C., 1 Rhag 2024, Yn: Marine Pollution Bulletin. 117217.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Abundance, population structure and claw morphology of the semi-terrestrial crab Pachygrapsus marmoratus (Fabricius, 1787) on shores of differing wave exposure.

    Silva, A. C., Brazao, S., Hawkins, S. J., Thompson, R. C. & Boaventura, D. M., 1 Tach 2009, Yn: Marine Biology. 156, 12, t. 2591-2599

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Academic ecosystems must evolve to support a sustainable postdoc workforce

    Alund, M., Emery, N., Jarrett, B. J. M., MacLeod, K. J., McCreery, H. F., Mamoozadeh, N., Phillips, J. G., Schossau, J., Thompson, A. W., Warwick, A. R., Yule, K. M., Zylstra, E. R. & Gering, E., 1 Meh 2020, Yn: Nature Ecology and Evolution. 4, 6, t. 777-781

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Academic performance and financial forecasting performance:A survey study

    Zhu, D., Hodgkinson, L. & Wang, Q., 10 Rhag 2018, Yn: Journal of Behavioral and Experimental Finance. 20, t. 45-51

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Accelerating public sector rice breeding with high-density KASP markers derived from whole genome sequencing of indica rice

    Steele, K., Quinton-Tulloch, M., Amgai, R. B., Dhakal, R., Khatiwada, S. P., Vyas, D., Heine, M. & Witcombe, J., Ebr 2018, Yn: Molecular Breeding. 38, 38.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Acceleration in the bilingual acquisition of phonological structure: Evidence from Polish–English bilingual children

    Tamburelli, M., Sanoudaki, E., Jones, G. & Sowinska, M., 18 Tach 2014, Yn: Bilingualism: Language and Cognition. 18, 4, t. 713-725

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Acceptability and Feasibility of a Mindfulness Intervention Delivered via Videoconferencing for People With Parkinson’s

    Bogosian, A., Hurt, C. S., Hindle, J. V., McCracken, L. M., Vasconcelos e Sa, D. A., Axell, S., Tapper, K., Stevens, J., Hirani, P. S., Salhab, M., Ye, W. & Cubi-Molla, P., Ion 2022, Yn: Journal of Geriatric Psychiatry and Neurology. 35, 1, t. 155-167 13 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. Cyhoeddwyd

    Acceptability of generic versus innovator oral medicines: not only a matter of taste

    Tuleu, C., Hughes, D., Clapham, D., Vallet, T. & Ruiz, F., Chwef 2021, Yn: Drug Discovery Today. 26, 2, t. 329-343

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Acceptability of identification and management of perinatal anxiety: a qualitative interview study with postnatal women

    Meades, R., Moran, P., Hutton, U., Khan, R., Maxwell, M., Cheyne, H., Delicate, A., Shakespeare, J., Hollins, K., Pisavadia, K., Doungsong, P., Edwards, R. T., Sinesi, A. & Ayers, S., 7 Tach 2024, Yn: Frontiers in Public Health. 12, 11 t., 1466150.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Accepting a “new” standard variety: Comparing explicit attitudes in Luxembourg and Belgium

    Vari, J. & Tamburelli, M., Medi 2021, Yn: Languages. 6, 3, e134.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Accepting pain management or seeking pain cure: An exploration of patients' attitudes to chronic pain

    Clarke, K. A. & Iphofen, R., 1 Meh 2007, Yn: Pain Management Nursing. 8, 2, t. 102-110

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Access to EU documents - the data protection exception.

    Johnson, H. A. & Johnson, H., 1 Ion 2008, Yn: Communications law. 13, 1, t. 17-20

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Access to community care for persons with dementia and their informal carers: Case vignettes for a European comparison of structures and common pathways to formal care

    Bieber, A., Stephan, A., Verbeek, H., Verhey, F., Kerpershoek, L., Wolfs, C., de Vught, M., Woods, R., Røsvik, J., Selbaek, G., Sjölund, B. M., Wimo, A., Hopper, L., Irving, K., Marques, M. J., Gonçalves-Pereira, M., Portolani, E., Zanetti, O. & Meyer, G., Gorff 2018, Yn: Zeitschrift für Gerontologie und Geriatrie. 51, 5, t. 530-536 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Access to consumer credit in the UK

    Deku, S. Y., Kara, A. & Molyneux, P., 2016, Yn: European Journal of Finance. 22, 10, t. 941-964

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Access to formal dementia care: Results from a systematic review and a European focus group study

    Woods, R. T., Stephen, A., Verhey, F., de Vugt, M., Wolfs, C., Handels, C., Handels, R., Verbeek, H., Kerpershoek, L., Bieber, A., Meyer, G., Pereira, M. G., Marques, M., Barrios, H., Balsinha, C., Woods, R., Wimo, A., Selbaeck, G., Irving, K. & Zanetti, O., 1 Rhag 2015, Yn: International Psychogeriatrics. 27, 1, t. S34-S35

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Access to lexical phonology does not predict retrieval of grammatical gender in Welsh: Implications for theories of language production.

    Tainturier, M., Gathercole, V. M., Leek, C., Tainturier, M. J., Leek, E. C., Schiemenz, S., Williams, C. A., Thomas, E. & Gathercole, V. C., 1 Hyd 2005, Yn: Brain and Language. 95, 1, t. 52-53

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Access to print literacy for children and young people with visual impairment: findings from a review of literature.

    Douglas, G., McLinden, M., McCall, S., Pavey, S., Ware, J. & Farrell, A. M., 1 Maw 2011, Yn: European Journal of Special Needs Education. 26, 1, t. 25-38

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Access to print literacy for children and young people with visual impairment: implications for policy and practice.

    Douglas, G., McLinden, M., Farrell, A. M., Ware, J., McCall, S. & Pavey, S., 1 Maw 2011, Yn: European Journal of Special Needs Education. 26, 1, t. 39-46

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Access to services by children with intellectual disability and mental health problems: Population-based evidence from the UK

    Toms, G. R., Healey, H. M., Toms, G., Totsika, V., Hastings, R. & Healey, H., 21 Mai 2015, Yn: Journal of Intellectual and Developmental Disability. 40, 3, t. 239-247

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Access to timely care in Portugal as compared to other European countries

    Woods, R. T., Pereira, M. G., Stephan, A., Verhey, F., de Vugt, M., Wolfs, C., Handels, R., Verbeek, H., Kerpershoek, L., Bieber, A., Meyer, G., Marques, M., Barrios, H., Balsinha, C., Woods, R., Wimo, A., Selbaeck, G., Irving, K. & Zannetti, O., 1 Rhag 2015, Yn: International Psychogeriatrics. 27, 1, t. S35-S36

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Access to timely formal dementia care in Europe: protocol of the Actifcare (ACcess to Timely Formal Care) study

    Kerpershoek, L., de Vugt, M., Wolfs, C., Jelley, H., Orrell, M., Woods, R., Stephan, A., Bieber, A., Meyer, G., Engedal, K., Selbaek, G., Handels, R., Wimo, A., Hopper, L., Irving, K., Marques, M., Gonçalves-Pereira, M., Portolani, E., Zanetti, O. & Verhey, F., 23 Awst 2016, Yn: BMC Health Services Research. 16, 423, t. 1-7 7 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  51. Cyhoeddwyd

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

    Rycroft-Malone, J., Gradinger, F., Owen Griffiths, H., Crane, R., Gibson, A., Mercer, S., Anderson, R. & Kuyken, W., 3 Ebr 2017, Yn: Health Services and Delivery Research. 5, 14

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid