Porth Ymchwil

Prifysgol Bangor

19401 - 19450 o blith 27,411Maint y tudalen: 50
Trefnu yn ôl: Primeiro autor
  1. Cyhoeddwyd

    Temperature-driven phenological changes within a marine larval fish assemblage.

    Genner, M. J., Halliday, N. C., Simpson, S. D., Southward, A. J., Hawkins, S. J. & Sims, D. W., 1 Mai 2010, Yn: Journal of Plankton Research. 32, 5, t. 699-708

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

  2. Cyhoeddwyd

    Ancient Hybridization and Phenotypic Novelty within Lake Malawi’s Cichlid Fish Radiation

    Genner, M. J. & Turner, G. F., 1 Ion 2012, Yn: Molecular Biology and Evolution. 29, 1, t. 195-206

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

  3. Cyhoeddwyd

    Geographical ancestry of Lake Malawi's cichlid fish diversity

    Genner, M. J., Ngatunga, B. P., Mzighani, S., Smith, A. & Turner, G. F., 10 Meh 2015, Yn: Biology Letters. 11, 6, t. Article Number: 20150232

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

  4. Cyhoeddwyd

    Regional climatic warming drives long-term community changes of British marine fish.

    Genner, M. J., Sims, D. W., Wearmouth, V. J., Southall, E. J., Southward, A. J., Henderson, P. A. & Hawkins, S. J., 1 Maw 2004, Yn: Proceedings of The Royal Society B Biological Sciences. 271, 1539, t. 655-661

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

  5. Cyhoeddwyd

    Presence of Acapoeta tanganicae (Actinopterygii: Cypriniformes: Cyprinidae ) within the Lake Rukwa catchment supports historic riverine connectivity with Lake Tanganyika

    Genner, M. J., Turner, G. F., Smith, A., Mzighani, S. & Ngatunga, B. P., 31 Maw 2015, Yn: Acta Ichthyologica Et Piscatoria. 45, 1, t. 109-112

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

  6. Cyhoeddwyd

    Angular histograms: Frequency-based visualizations forlLarge, high dimensional data

    Geng, Z., Peng, Z., Laramee, R. S., Walker, R. & Roberts, J. C., 1 Rhag 2011, Yn: IEEE Transactions on visualization and computer graphics. 17, 12, t. 2572-2580

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

  7. Cyhoeddwyd

    Abundance and distribution of Octopus cyanea in the Rodrigues Lagoon.

    Genave, J. T., Turner, J. R., Latchford, J., Burnett, J. C. (Golygydd), Kavanagh, J. S. (Golygydd), Spencer, T. (Golygydd) & Latchford, J., 1 Ion 2001, Shoals of Capricorn Programme Field Report 1998–2001: Marine science: training and education in the western Indian Ocean. 2001 gol. Royal Society and Royal Geographical Society (with the Institute of British Geographers), t. 65

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

  8. Cyhoeddwyd

    Insights from two decades of the Student Conference on Conservation Science

    Geldmann, J., Ales-Pinto, H., Amano, T., Bartlett, H., Christie, A. P., Collas, L., Cooke, S. C., Correa, R., Cripps, I., Doherty, A., Finch, T., Garnett, E. E., Hua, F., Jones, J. P. G., Kasoar, T., MacFarlane, D., Martin, P. A., Mukherjee, N., Mumby, H. S., Payne, C., Petrovan, S. O., Rocha, R., Russell, K., Simmons, B. I., Wauchope, H. S., Worthington, T. A., Trevelyan, R., Green, R. & Balmford, A., Maw 2020, Yn: Biological Conservation. 243, 108478.

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

  9. Cyhoeddwyd

    Causal claims, causal assumptions and protected area impact

    Geldmann, J., Jones, J. P. G., Wauchope, H. & Ferraro, P. J., 26 Chwef 2025, Yn: Nature. 638, 8052, t. E40-E41

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

  10. Cyhoeddwyd

    Engagement in co-management of marine benthic resources influences environmental perceptions of artisanal fishers.

    Gelcich, S., Kaiser, M. J., Castilla, J. C. & Edwards-Jones, G., 1 Maw 2008, Yn: Environmental Conservation. 35, 1, t. 36-45

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

  11. Cyhoeddwyd

    Heterogeneity in fishers' harvesting decisions under a marine territorial user rights policy.

    Gelcich, S., Edwards-Jones, G. & Kaiser, M. J., 1 Maw 2007, Yn: Ecological Economics. 61, 2-3, t. 246-254

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

  12. Cyhoeddwyd

    Co-management policy can reduce resilience in traditionally managed marine ecosystems.

    Gelcich, S., Edwards-Jones, G., Kaiser, M. J. & Castilla, J. C., 1 Medi 2006, Yn: Ecosystems. 9, 6, t. 951-966

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

  13. Cyhoeddwyd

    Using discourses for policy evaluation: the case of marine common property rights in Chile.

    Gelcich, S., Edwards-Jones, G., Kaiser, M. J. & Watson, E., 1 Ebr 2005, Yn: Society and Natural Resources. 18, 4, t. 377-391

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

  14. Cyhoeddwyd

    Importance of attitudinal differences among artisanal fishers toward co-management and conservation of marine resources.

    Gelcich, S., Edwards-Jones, G. & Kaiser, M. J., 1 Meh 2005, Yn: Conservation Biology. 19, 3, t. 865-875

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

  15. Cyhoeddwyd

    4,5,4 ' 5 '-Tetrakis(2-methyl-thiopen-3-yl)-[2,2 ']bi[[1,3]dithiolylidene]

    Gelbrich, T., Roberts-Bleming, S. J., Kalaji, M., Murphy, P. J. & Hursthouse, M. B., 1 Rhag 2001, Yn: Acta Crystallographica Section E: Structure Reports Online. 57, 12, t. o1143-o1144

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

  16. Cyhoeddwyd

    A progress report on the control of the free surface in a 3D Navier Stokes solver for coastal applications.

    Gejadze, I., Copeland, G., Neill, S. P., Fang, F. & Pain, C., 1 Ion 2004, t. 681-694.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  17. Cyhoeddwyd

    Interactive responses to temperature and salinity in larvae of the Asian brush-clawed crab Hemigrapsus takanoi: relevance for range expansion into the Baltic Sea, in the context of climate change

    Geißel, J. P., Espinosa-Novo, N., Gimenez Noya, L., Ewers, C., Cornelius, A., Martinez-Alarcon, D., Harzsch, S. & Torres, G., 29 Chwef 2024, Yn: Biological Invasions. 26, 6, t. 1685-1704 20 t.

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

  18. Cyhoeddwyd

    Primary productivity of planet earth: biological determinants and physical constraints in terrestrial and aquatic habitats.

    Geider, R. J., DeLucia, E. H., Falkowski, P. G., Finzi, A. C., Grime, J. P., Grace, J., Kana, T. M., La Roche, J., Long, S. P., Osborne, B. A., Platt, T., Prentice, I. C., Raven, J. A., Schlesinger, W. H., Smetacek, V., Stuart, V., Sathyendranath, S., Thomas, R. B., Vogelmann, T. C., Williams, P. J. & Woodward, F. I., 1 Rhag 2001, Yn: Global Change Biology. 7, 8, t. 849-882

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

  19. Cyhoeddwyd

    Food sources, behaviour and distribution of hydrothermal vent shrimps at the Mid–Atlantic Ridge

    Gebruk, A. V., Southward, E. C., Kennedy, H. A. & Southward, A. J., 1 Meh 2000, Yn: Journal of the Marine Biological Association of the United Kingdom. 80, 3, t. 485-499

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

  20. Cyhoeddwyd

    Health utilities and quality-adjusted life years for patients with amyotrophic lateral sclerosis receiving reldesemtiv or placebo in FORTITUDE-ALS

    Gebrehiwet, P., Meng, L., Saroccoa, P., Wei, J., Wolff, A. A., Butzner, M., Chio, A., Andrews, J. A., Genge, A., Hughes, D., Jackson, C. E., Lechtzin, N., Miller, T. M. & Shefner, J. M., 31 Maw 2023, Yn: Journal of Medical Economics. 26, 1, t. 488-493 6 t.

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

  21. Cyhoeddwyd

    Differential long-term fertilization alters residue-derived labile organic carbon fractions and microbial community during straw residue decomposition

    Ge, Z., Li, S., Bol, R., Zhu, P., Peng, C., An, T., Cheng, N., Liu, X., Li, T., Xu, Z. & Wang, J., 1 Medi 2021, Yn: Soil & Tillage Research. 213, 105120.

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

  22. Cyhoeddwyd

    Microbial biomass, activity, and community structure in horticultural soils under conventional and organic management strategies

    Ge, T., Hunan., C. A. O., Yuan, H., Li, B., Zhu, H., Peng, P., Li, K., Jones, D. L. & Wu, J., 30 Medi 2013, Yn: European Journal of Soil Biology. 58, t. 122-128

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

  23. Cyhoeddwyd

    Rice rhizodeposition and its utilization by microbial groups depends on N fertilization

    Ge, T., Li, B., Zhu, Z., Hu, Y., Yuan, H., Dorodnikov, M., Jones, D., Wu, J. & Kuzyakov, Y., 1 Ion 2017, Yn: Biology and Fertility of Soils. 53, 1, t. 37 48 t.

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

  24. Cyhoeddwyd

    Amino acid and peptide dynamics in horticultural soils under conventional and organic management strategies

    Ge, T., Yuan, H., Roberts, P., Jones, D. L., Qin, H., Tong, C. & Hunan., C. A. O., 15 Rhag 2011, Yn: Journal of Soils and Sediments. 12, 3, t. 323-333

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

  25. Cyhoeddwyd

    Influence of inorganic and organic nitrogen on enzymes of nitrogen assimilation and growth in tomato seedlings

    Ge, T.-D., Roberts, P., Jones, D. L., Yang, D.-D., Song, S.-W., Lu-Bo, Ming-Ding & Huang, D.-F., 1 Gorff 2008, Yn: Journal of Horticultural Science and Biotechnology. 83, 4, t. 513-519

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

  26. Cyhoeddwyd

    Dynamics of nitrogen speciation in horticultural soils in suburbs of Shanghai, China.

    Ge, T. D., Huang, D. F., Roberts, P., Jones, D. L. & Song, S. W., 1 Ebr 2010, Yn: Pedosphere. 20, 2, t. 261-272

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

  27. Cyhoeddwyd

    Amino acids as a nitrogen source for tomato seedlings: the use of dual-labeled (13C, 15N) glycine to test for direct uptake by tomato seedlings.

    Ge, T., Song, S., Roberts, P., Jones, D. L., Huang, D. & Iwasaki, K., 1 Medi 2009, Yn: Environmental and Experimental Botany. 66, 3, t. 357-361

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

  28. Cyhoeddwyd

    Greenhouse gas mitigation and rural electricity generation by a novel two-stroke biogas engine

    Gde Tirta Nindhia, T., McDonald, M. & Styles, D., 20 Ion 2021, Yn: Journal of Cleaner Production. 280, 2, 124473.

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

  29. Cyhoeddwyd

    Structural geological factors in open pit coal mine design, with special reference to thrusting: case study from the Ffyndaff sites in the South Wales Coalfield

    Gayer, R. A., Hathaway, T. & Davis, J., 1 Ion 1995, European Coal Geology: Geological Society Special Publication No. 82. Whateley, M. K. G. & Spears, D. A. (gol.). London: The Geological Society, t. 233-249 17 t. (European coal geology).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  30. Cyhoeddwyd

    An internal model control approach to mid-ranging control

    Gayadeen, S. & Heath, W., 23 Ebr 2016, Yn: IFAC Proceedings Volumes (IFAC-PapersOnline). 42, 11, t. 542-547 6 t.

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

  31. Cyhoeddwyd

    Microbial Communities of Polymetallic Deposits’ Acidic Ecosystems of Continental Climatic Zone With High Temperature Contrasts

    Gavrilov, S. N., Korzhenkov, A. A., Kublanov, I. V., Bargiela, R., Zamana, L. V., Toshchakov, S. V., Golyshin, P. & Golyshina, O., 17 Gorff 2019, Yn: Frontiers in Microbiology.

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

  32. Cyhoeddwyd

    Relationship between midweek training measures of testosterone and cortisol concentrations and game outcome in professional rugby union matches.

    Gaviglio, C. M. & Cook, C. J., 1 Rhag 2014, Yn: Journal of Strength and Conditioning Research. 28, 12, t. 3447-3452

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

  33. Cyhoeddwyd

    Salivary testosterone and cortisol responses to four different rugby training exercise protocols.

    Gaviglio, C. M., Osborne, M., Kelly, V. G., Kilduff, L. P. & Cook, C. J., 6 Maw 2015, Yn: European Journal of Sport Science. 15, 6, t. 497-504

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

  34. Cyhoeddwyd

    Enhanced Single-phase Phase Locked Loop based on Complex-Coefficient Filter

    Gautam, S., Xiao, W., Ahmed, H. & Lu, D.D.-C., 2022, Yn: IEEE Transactions on Instrumentation and Measurement . 71, 9001408.

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

  35. Cyhoeddwyd

    Development of Frequency-Fixed All-Pass Filter based Single-Phase Phase-Locked Loop

    Gautam, S., Xiao, W., Lu, D.D.-C., Ahmed, H. & Guerrero, J. M., 31 Mai 2021, Yn: IEEE Journal of Emerging and Selected Topics in Power Electronics .

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

  36. Cyhoeddwyd

    Food Security through Ricebean Research in India and Nepal (FOSRIN) Report 1. Distribution of ricebean in India and Nepal.

    Gautam, R., Kumar, N., Yadavendra, J. P., Neog, S. B., Thakur, S., Khanal, A., Bhandari, B., Joshi, J. D. & Hollington, P. A., 1 Ion 2007, 2007 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  37. Cyhoeddwyd

    Effects of alcohol cue exposure on response inhibition in detoxified alcohol-dependent patients.

    Gauggel, S., Heusinger, A., Forkmann, T., Boecker, M., Lindenmeyer, J., Cox, W. M. & Staedtgen, M., 1 Medi 2010, Yn: Alcoholism: Clinical and Experimental Research. 34, 9, t. 1584-1589

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

  38. Cyhoeddwyd

    Teasing apart factors influencing Executive Function performance in bilinguals and monolinguals at different ages

    Gathercole, V. C. M., Thomas, E. M., Viñas Guasch, N., Kennedy, I., Prys, C., Young, N. E., Roberts, E. J., Hughes, E. K. & Jones, L., Hyd 2016, Yn: Linguistic Approaches to Bilingualism. 6, 5, t. 605-647

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

  39. Cyhoeddwyd

    Teasing apart factors influencing executive function performance in bilinguals and monolinguals at different ages: Teasing apart factors

    Gathercole, V., Thomas, E., Vinas-Guasch, N., Kennedy, I., Prys, C., Young, N., Roberts, E., Hughes-Parry, E. & Jones, L., 12 Meh 2019, Bilingualism, Executive Function, and Beyond: Questions and insights. Sekerina, I., Spradlin, L. & Valian, V. (gol.). Amsterdam/Philadelphia: John Benjamins, Cyfrol 57 . t. 295-336 42 t. (Studies in Bilingualism; Cyfrol 57).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Ffactorau yn cyfrannu at drosglwyddo iaith mewn teuluoedd dwyieithog: yr astudiaeth graidd - cyfweliadau oedolion

    Gathercole, V. & Thomas, E., 2007, Trosglwyddo Iaith mewn Teuluoedd Dwyieithog yng Nghymru . Thomas, E. & Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 59-179

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

  41. Cyhoeddwyd

    Trosglwyddo iaith ymysg rhieni dwyieithog yng Nghymru: cefndir

    Gathercole, V., Thomas, E., Deuchar, M. & Williams, E., 2007, Trosglwyddo Iaith mewn Yeuluoedd Dwyieithog yng Nghymru. Thomas, E. & Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 10-12 3 t.

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

  42. Cyhoeddwyd

    Ymarfer ar sail tystiolaeth: goblygiadau polisi ar gyfer Cymru

    Gathercole, V., Thomas, E., Williams, E. & Deuchar, M., 2007, Trosglwyddo iaith mewn Teuluoedd Dwyieithog yng Nghymru. Thomas, E. & Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 288-294

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

  43. Cyhoeddwyd

    A closer look at parent language ability: Welsh and English vocabulary

    Gathercole, V. & Thomas, E., 2007, Language Transmission in Bilingual Families in Wales. Gathercole, V. (gol.). Welsh Language Board, t. 210-222

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

  44. Cyhoeddwyd

    Agwedd amweddog at astudio arferion trosglwyddo cyfredol: cynllun cyffredinol

    Gathercole, V., Thomas, E., Deuchar, M. & Williams, E., 2007, Trosglwyddo Iaith mewn Teuluoedd Dwyieithog yng Nghymru . Thomas, E. & Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 13-19

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

  45. Cyhoeddwyd

    Language transmission among bilingual parents in Wales: background

    Gathercole, V., Thomas, E., Deuchar, M. & Williams, E., 2007, Language Transmission in Bilingual Families in Wales. Gathercole, V. (gol.). Cardiff : Welsh Language Board, t. 12-14 3 t.

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

  46. Cyhoeddwyd

    Factors contributing to language transmission in bilingual families: the core study - adult interviews

    Gathercole, V. & Thomas, E., 2007, Language Transmission in Bilingual Families in Wales. Gathercole, V. (gol.). Welsh Language Board, t. 59-181

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

  47. Cyhoeddwyd

    WHODUNNIT? Language interaction in identification of sentential subjects in Wales and Patagonia

    Gathercole, V., Perez-Tattam, R., Stadthagen-Gonzalez, H., Laporte, N. & Thomas, E., 3 Hyd 2019, Yn: International Journal of Bilingual Education and Bilingualism. 22, 7, t. 897-918

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

  48. Cyhoeddwyd

    Golwg fanylach ar allu iaith rhieni: geirfa Cymraeg a Saesneg

    Gathercole, V. & Thomas, E., 2007, Trosglwyddo Iaith mewn Teuluoedd Dwyieithog yng Nghymru . Thomas, E. & Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 207-219

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

  49. Cyhoeddwyd

    Multi-faceted approach to teh study of current transmission practices: ooverall design

    Gathercole, V., Thomas, E., Deuchar, M. & Williams, E., 2007, Language Transmission in Bilingual Families in Wales. Gathercole, V. (gol.). Cardiff: Welsh Language Board, t. 15-21 7 t.

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

  50. Cyhoeddwyd

    Categorizing collections of objects: Linguistic and cognitive factors influencing Welsh and English speakers' judgments

    Gathercole, V. M., Roberts, S. H. & Gathercole, V. C., 1 Mai 2006, Yn: First Language. 26, 2, t. 161-185

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

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