Coleg Gwyddoniaeth a Pheirianneg

  1. Cyhoeddwyd

    On-farm seed priming for barley on normal, saline and saline-sodic soils in North West Frontier Province, Pakistan

    Rashid, A., Hollington, P. A., Harris, D. & Khan, P., 1 Ebr 2006, Yn: European Journal of Agronomy. 24, 3, t. 276-281

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  2. Cyhoeddwyd

    Improving the yield of mungbean (Vigna radiata) in the North West Frontier Province of Pakistan using on-farm seed priming.

    Rashid, A., Harris, D., Hollington, P. A. & Rafiq, M., 1 Ebr 2004, Yn: Experimental Agriculture. 40, 2, t. 233-244

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  3. Cyhoeddwyd

    On-farm seed priming reduces yield losses of mungbean (Vigna radiata) associated with mungbean yellow mosaic virus in the North West Frontier Province of Pakistan.

    Rashid, A., Harris, D., Hollington, P. A. & Ali, S., 1 Tach 2004, Yn: Crop Protection. 23, 11, t. 1119-1124

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  4. Cyhoeddwyd

    On-farm seed priming: a key technology for improving the livelihoods of resource-poor farmers on saline lands

    Rashid, A., Harris, D., Hollington, P. A., Khattak, R. A., Ahmad, R. (gol.) & Malik, K. A. (gol.), 1 Ion 2002, Prospects for Saline Agriculture. 2002 gol. Kluwer Academic Publishers, t. 423-431

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  5. Cyhoeddwyd

    Costs and benefits of invasive exotic plants in the Mediterranean.

    Raquin, A., Edwards-Jones, G., Bardsley, D. & Papanastasis, A. (gol.), 25 Ebr 2004, t. 1-10.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  6. Cyhoeddwyd

    The Fibrobacteres: an Important Phylum of Cellulose-Degrading Bacteria

    Ransom-Jones, E., Jones, D., McCarthy, A. J. & McDonald, J. E., Chwef 2012, Yn: Microbial Ecology. 63, 2, t. 267-281

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Lignocellulose-Degrading Microbial Communities in Landfill Sites Represent a Repository of Unexplored Biomass- Degrading Diversity Emma

    Ransom-Jones, E., McCarthy, AJ., Haldenby, S., Doonan, J. & McDonald, JE., Awst 2017, Yn: mSphere. 2, 4, e00300.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Distribution and diversity of members of the bacterial phylum Fibrobacteres in environments where cellulose degradation occurs

    Ransom-Jones, E., Jones, D. L., Edwards, A. & McDonald, J. E., 17 Gorff 2014, Yn: Systematic and Applied Microbiology. 37, 7, t. 502-509

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Draft Genome Sequence of Clostridium sp. strain W14A isolated from a cellulose-degrading biofilm in a landfill leachate microcosm

    Ransom-Jones, E. & McDonald, J., 22 Medi 2016, Yn: Genome Announcements. 4, 5, e0098516.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  10. Cyhoeddwyd

    Greenhouse gas sink or health risk? Assessing the fate of polycyclic aromatic hydrocarbons (PAHs) in biochar within the plant-soil system

    Rangecroft, S., DeLuca, T., Emmett, B. & Jones, D., 22 Awst 2010, Yn: Abstracts of papers - American Chemical Society. 240

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Consumption of bushmeat around a major mine, and matched communities, in Madagascar

    Randriamamonjy, V. C., Keane, A., Razafimanahaka, H. J., Jenkins, R. K. & Jones, J. P. G., 19 Maw 2015, Yn: Biological Conservation. 186

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. Cyhoeddwyd

    The antigenicity and cholesteroid nature of mycolic acids determined by recombinant chicken antibodies

    Ranchod, H., Ndlanda, F. L., Lemmer, Y., Beukes, M., Niebuhr, J., Al-Dulayymi, J., Wemmer, S., Fehrsen, J., Baird, M. & Verschoor, J. A., 9 Awst 2018, Yn: PLoS ONE. 13, 8

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  13. Cyhoeddwyd

    Participatory varietal selection (PVS) for post rainy (rabi) season sorghum.

    Rana, B. S., Witcombe, J. R. & Virk, D. S., 1 Ion 2005, 2005 gol. Centre for Arid Zone Studies.

    Allbwn ymchwil: Llyfr/AdroddiadAdroddiad Comisiwn

  14. Cyhoeddwyd

    Modelling agri-environment interactions and trade-offs using Farm-adapt-integration of models, investigation of scale, dynamics and uncertainty.

    Ramsden, S. J., Gibbons, J. M., MacLeod, M. (gol.), Mayne, S. (gol.), McRoberts, N. (gol.), Oldham, J. (gol.), Renwick, A. (gol.), Rivington, M. (gol.), Russell, G. (gol.), Toma, L. (gol.), Topp, K. (gol.), Wall, E. (gol.) & Wreford, A. (gol.), 1 Ion 2009, Aspects of Applied Biology 93, Integrated Agricultural Systems: Methoodologies, Modelling and Measuring. 2009 gol. Association of Applied Biologists, t. 123-130

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  15. Cyhoeddwyd

    Invest in arms: behavioural and energetic implications of multiple autotomy in starfish (Asterias rubens)

    Ramsay, K., Kaiser, M. J. & Richardson, C. A., 1 Medi 2001, Yn: Behavioral Ecology and Sociobiology. 50, 4, t. 360-365

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Can shell scars on dog cockles (Glycymeris glycymeris L.) be used as an indicator of fishing disturbance?

    Ramsay, K., Kaiser, M. J., Richardson, C. A., Veale, L. O. & Brand, A. R., 1 Mai 2000, Yn: Journal of Sea Research. 43, 2, t. 167-176

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Fish scale δ15N and δ13C values provide biogeochemical tags of fish comparable in performance to element concentrations in scales and otoliths

    Ramsay, A. L., Milner, N. J., Hughes, R. N. & McCarthy, I. D., 1 Medi 2012, Yn: Hydrobiologia. 694, 1, t. 183-196

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Biogeochemical tags in fish: predicting spatial variations in strontium and manganese in Salmo trutta scales using stream water geochemistry

    Ramsay, A. L., Hughes, R. N., Chenery, S. R. & McCarthy, I. D., 11 Tach 2014, Yn: Canadian Journal of Fisheries and Aquatic Sciences. 72, 3, t. 422-433

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Techniques for assessing repaired shell damage in dog cockles, Glycymeris glycymeris L.

    Ramsay, K. & Richardson, C. A., 1 Rhag 2000, Yn: Journal of Shellfish Research. 19, 2, t. 927-931

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. Cyhoeddwyd

    Comparison of the performance of scale and otolith microchemistry as fisheries research tools in a small upland catchment.

    Ramsay, A. L., Milner, N. J., Hughes, R. N. & McCarthy, I. D., 1 Mai 2011, Yn: Canadian Journal of Fisheries and Aquatic Sciences. 68, 5, t. 823-833

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Causes of shell scarring in dog cockles Glycymeris glycymeris L.

    Ramsay, K., Richardson, C. A. & Kaiser, M. J., 1 Mai 2001, Yn: Journal of Sea Research. 45, 2, t. 131-139

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  22. Cyhoeddwyd

    A link between predator density and arm loss in the starfish Marthasterias glacialis and Asterias rubens.

    Ramsay, K., Turner, J. R., Vize, S. J. & Richardson, C. A., 1 Meh 2000, Yn: Journal of the Marine Biological Association of the United Kingdom. 80, 3, t. 565-566

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  23. Cyhoeddwyd

    Impact of trawling on populations of the invertebrate scavenger Asterias rubens

    Ramsay, K., Kaiser, M. J., Rijnsdorp, A. D., Craeymeersch, J., Ellis, J., Kaiser, M. J. (gol.) & De Groot, S. J. (gol.), 1 Ion 2000, The effects of trawling on non–target species and habitats: biological: conservation and socio–economic issues. 2000 gol. Blackwell Science, t. 151-162

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddPennod

  24. Cyhoeddwyd

    Damage, autotomy and arm regeneration in starfish caught by towed demersal fishing gears.

    Ramsay, K., Bergmann, M., Veale, L. O., Richardson, C. A., Kaiser, M. J., Vize, S. J. & Feist, S. W., 1 Maw 2001, Yn: Marine Biology. 138, 3, t. 527-536

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  25. Cyhoeddwyd

    Tracing the geographical origin of sea trout using scale microchemistry.

    Ramsay, A. L., McCarthy, I. D., Hughes, R. N., Milner, N. J. & Davidson, I. C., 1 Ion 2007.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  26. Cyhoeddwyd

    Slight changes in the chemical structure of haemanthamine greatly influence the effect of the derivatives on rumen fermentation in vitro

    Ramos-Morales, E., Braganca, R., Murphy, P., Tibble-Howlings, J. & Newbold, C. J., 21 Chwef 2019, Yn: Scientific Reports. 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    The effect of an isoflavonid-rich liquorice extract on fermentation, methanogenesis and the microbiome in the rumen simulation technique

    Ramos-Morales, E., Rossi, G., Cattin, M., Jones, E., Braganca, R. & Newbold, C. J., Maw 2018, Yn: Fems Microbiology Ecology. 94, 3, fiy009.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Antiprotozoal effect of saponins in the rumen can be enhanced by chemical modifications in their structure

    Ramos-Morales, E., De La Fuente, G., Duval, S., Wehrli, C., Bouillon, M., Lahmann, M., Preskett, D., Braganca, R. & Newbold, J., 16 Maw 2017, Yn: Frontiers in Microbiology. 8, 399.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  29. Cyhoeddwyd

    In vitro effect of the combination of Ivy fruit refined extract and a glucosidase inhibitor on rumen fermentation and protozoa activity

    Ramos-Morales, E., de la Fuente, G., Nash, R., Preskett, D. & Newbold, C. J., 19 Meh 2014.

    Allbwn ymchwil: Cyfraniad at gynhadleddPapur

  30. Cyhoeddwyd

    Improving the antiprotozoal effect of saponins in the rumen by combination with glycosidase inhibiting iminosugars or by modification of their chemical structure

    Ramos-Morales, E., de la Fuente, G., Nash, R. J., Braganca, R., Duval, S., Bouillon, M., Lahmann, M. & Newbold, J., 8 Medi 2017, Yn: PLoS ONE. 12, 9, e0184517.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Structural and functional characterization of a ruminal β-glycosidase defines a novel subfamily of glycosyl hydrolase family 3 with permuted domain topology

    Ramirez-Escudero, M., del Pozo, M. V., Marin-Navarro, J., Gonzalez, B., Golyshin, P., Polaina, J., Ferrer, M. & Sanz-Aparico, J., 11 Tach 2016, Yn: Journal of Biological Chemistry. 291, t. 24200-24214

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Detecting macroecological patterns in bacterial communities across independent studies of global soils

    Ramirez, K. S., Knight, C. G., Hollander, M., Brearley, F. Q., Constantinides, B., Cotton, T. E. A., Creer, S., Crowther, T. W., Davison, J., Delgado-Baquerizo, M., Dorrepaal, E., Elliott, D. R., Fox, G., Griffiths, R., Hale, C., Hartman, K., Houlden, A., Jones, D., Krab, E. J., Maestre, F. T., McGuire, K. L., Monteux, S., Orr, C. H., van der Putten, W. H., Roberts, I. S., Robinson, D., Rocca, J., Rowntree, J., Schlaeppi, K., Shepherd, M., Singh, B. K., Straathof, A., Talbot, J. M., Thion, C., van der Heijden, M. & de Vries, F. T., 2018, Yn: Nature Microbiology. 3, t. 189-196 8 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Impact of molybdenum cross sections on FHR analysis

    Ramey, K. M., Margulis, M., Read, N., Shwageraus, E. & Petrovic, B., 1 Maw 2022, Yn: NUCLEAR ENGINEERING AND TECHNOLOGY. 54, 3, t. 817-825

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. Cyhoeddwyd

    A paper microfluidic device based colorimetric sensor for the detection and discrimination of elapid versus viper envenomation

    Ramana, L., Mathapati, S. S., Salvi, N., Khadilkar, M. V., Malhotra, A., Santra, V. & Sharma, T. K., 21 Chwef 2022, Yn: Analyst. 147, 4, t. 685-694

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Madagascar's extraordinary biodiversity: Threats and opportunities

    Ralimanana, H., Perrigo, A. L., Smith, R. J., Borrell, J. S., Faurby, S., Rajaonah, M. T., Randriamboavonjy, T., Vorontsova, M. S., Cooke, R. S. C., Phelps, L. N., Sayol, F., Andela, N., Andermann, T., Andriamanohera, A. M., Andriambololonera, S., Bachman, S. P., Bacon, C. D., Baker, W. J., Belluardo, F., Birkinshaw, C., Cable, S., Canales, N. A., Carrillo, J. D., Clegg, R., Clubbe, C., Crottini, A., Damasco, G., Dhanda, S., Edler, D., Farooq, H., de Lima Ferreira, P., Fisher, B. L., Forest, F., Gardiner, L. M., Goodman, S. M., Grace, O. M., Guedes, T. B., Hackel, J., Henniges, M. C., Hill, R., Lehmann, C. E. R., Lowry, P. P., Marline, L., Matos-Maraví, P., Moat, J., Neves, B., Nogueira, M. G. C., Onstein, R. E., Papadopulos, A. S. T., Perez-Escobar, O. A., Phillipson, P. B., Pironon, S., Przelomska, N. A. S., Rabarimanarivo, M., Rabehevitra, D., Raharimampionona, J., Rajaonary, F., Rajaovelona, L. R., Rakotoarinivo, M., Rakotoarisoa, A. A., Rakotoarisoa, S. E., Rakotomalala, H. N., Rakotonasolo, F., Ralaiveloarisoa, B. A., Ramirez-Herranz, M., Randriamamonjy, J. E. N., Randrianasolo, V., Rasolohery, A., Ratsifandrihamanana, A. N., Ravololomanana, N., Razafiniary, V., Razanajatovo, H., Razanatsoa, E., Rivers, M., Silvestro, D., Testo, W., Torres Jiménez, M. F., Walker, K., Walker, B. E., Wilkin, P., Williams, J., Ziegler, T., Zizka, A. & Antonelli, A., 2 Rhag 2022, Yn: Science. 378, 6623, eadf1466.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl adolyguadolygiad gan gymheiriaid

  36. Cyhoeddwyd

    A systematic review of the reliability and validity of discrete choice experiments in valuing non-market environmental goods

    Rakotonarivo, O., Schaafsma, M. & Hockley, N., 1 Rhag 2016, Yn: Journal of Environmental Management. 183, 1, t. 98-109

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  37. Cyhoeddwyd

    Qualitative and quantitative evidence on the true local welfare costs of forest conservation in Madagascar: Are discrete choice experiments a valid ex ante tool?

    Rakotonarivo, S., Jacobsen, J. B., Larsen, J. B., Jones, J. P. G., Nielsen, M. S., Ramamonjisoa, B. S., Mandimbiniaina, R. & Hockley, N., Meh 2017, Yn: World Development. 94, t. 478-491

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  38. Cyhoeddwyd

    Estimating welfare impacts where property rights are contested: methodological and policy implications

    Rakotonarivo, O., Jacobsen, J., Poudyal, M., Rasoamanana, A. & Hockley, N., Ion 2018, Yn: Land Use Policy. 70, t. 71-83

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  39. Cyhoeddwyd

    Resolving land tenure security is essential to deliver forest restoration

    Rakotonarivo, O. S., Rakotoarisoa, M., Rajaonarivelo, H. M., Raharijaona, S., Jones, J. P. G. & Hockley, N., 25 Mai 2023, Yn: Communications Earth and Environment. 4, 1, 179.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  40. Cyhoeddwyd

    The effects of environmental education on children's and parents' knowledge and attitudes towards lemurs in rural Madagascar

    Rakotomamonjy, S. N., Jones, J. P. G., Razafimanahaka, J. H., Ramamonjisoa, B. & Williams, S., 8 Ebr 2015, Yn: Animal Conservation. 18, 2, t. 157-166

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Effects of sowing method on survival, ion uptake and yield of wheat (Triticum aestivum L.) in sodic soils.

    Rajpar, I. & Wright, D., 1 Meh 2000, Yn: Journal of Agricultural Science. 134, 4, t. 369-378

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Pulse Amplitude Modulation for Electro-optical Spiking Neural Networks

    Rajbhandari, S., Uleru, G-I., Hulea, M., Younus, O. I. & Ghassemlooy, Z., 1 Medi 2022, 2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddCyfraniad i Gynhadleddadolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Revue des textes fonciers et forestiers pour la mise en œuvre de la restauration des paysages forestiers à Madagascar

    Rajaonarivelo, H. M., Rakotonarivo, S., Raharijoana, S., Raparison, E., Rakotoarisoa, M. & Hockley, N., 1 Rhag 2021, Yn: Madagascar Conservation and Development. 16, 1, t. 32-42

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  44. Cyhoeddwyd

    36 year trends in dissolved organic carbon export from Finnish rivers to the Baltic Sea

    Raike, A., Kortelainen, P., Mattsson, T. & Thomas, D. N., 1 Hyd 2012, Yn: Science of the Total Environment. 435, t. 188-201

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  45. Cyhoeddwyd

    Corrigendum to “36 year trends in dissolved organic carbon export from Finnish rivers to the Baltic Sea” [Sci. Total Environ. 435–436(2012) 188–201]

    Raike, A., Kortelainen, P., Mattsson, T. & Thomas, D. N., 1 Maw 2014, Yn: Science of the Total Environment. 473, t. 750-750

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  46. Cyhoeddwyd

    Suspended nanocrystalline diamond ridge waveguides designed for the mid-infrared

    Rahmati, A. T., Mashanovich, G. Z. & Nezhad, M. P., 21 Meh 2021, Yn: Journal of Optics. 23, 7, 075801.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Tree Culture of Smallholder Farmers Practicing Agroforestry in Gunung Salak Valley, West Java, Indonesia

    Rahman, S. A., Sunderland, T., Roshetko, J. M., Basuki, I. & Healey, J., 1 Rhag 2016, Yn: Small-Scale Forestry. 15, 4, t. 433-442

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Towards Productive Landscapes: Trade-offs in Tree-cover and Income across a Matrix of Smallholder Agricultural Land-use Systems

    Rahman, S., Sunderland, T., Kshatriya, M., Roshetko, J. M., Pagella, T. & Healey, J., 15 Rhag 2016, Yn: Land Use Policy. 58, December, t. 152-164

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Finding alternatives to swidden agriculture: Does agroforestry improve livelihood options and reduce pressure on existing forest?

    Rahman, S. A., Jacobsen, J. B., Healey, J. R., Roshetko, J. M. & Sunderland, T., Chwef 2017, Yn: Agroforestry Systems. 91, 1

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Facilitating smallholder tree farming in fragmented tropical landscapes: Challenges and potentials for sustainable land management

    Rahman, S., Sunderland, T., Roshetko, J. M. & Healey, J., Awst 2017, Yn: Journal of Environmental Management. 198, Part 1, t. 110-121

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid