Safety, immunogenicity, and reactogenicity of BNT162b2 and mRNA-1273 COVID-19 vaccines given as fourth-dose boosters following two doses of ChAdOx1 nCoV-19 or BNT162b2 and a third dose of BNT162b2 (COV-BOOST): a multicentre, blinded, phase 2, randomised trial

Munro, A. P. S., Feng, S., Janani, L., Cornelius, V., Aley, P. K., Babbage, G., Baxter, D., Bula, M., Cathie, K., Chatterjee, K., Dodd, K., Enever, Y., Qureshi, E., Goodman, A. L., Green, C. A., Harndahl, L., Haughney, J., Hicks, A., Klaauw, A. A. V. D., Kanji, N., Libri, V., Llewelyn, M. J., McGregor, A. C., Maallah, M., Minassian, A. M., Moore, P., Mughal, M., Mujadidi, Y. F., Holliday, K., Osanlou, O., Osanlou, R., Owens, D. R., Pacurar, M., Palfreeman, A., Pan, D., Rampling, T., Regan, K., Saich, S., Bawa, T., Saralaya, D., Sharma, S., Sheridan, R., Thomson, E. C., Todd, S., Twelves, C., Read, R. C., Charlton, S., Hallis, B., Ramsay, M., Andrews, N., Lambe, T., Nguyen-Van-Tam, J. S., Snape, M. D., Liu, X., Faust, S. N., Munro, A. P. S., Feng, S., Janani, L., Cornelius, V., Aley, P. K., Babbage, G., Baxter, D., Bula, M., Cathie, K., Chatterjee, K., Dodd, K., Enever, Y., Qureshi, E., Goodman, A. L., Green, C. A., Harndahl, L., Haughney, J., Hicks, A., Klaauw, A. A. V. D., Kanji, N., Libri, V., Llewelyn, M. J., McGregor, A. C., Minassian, A. M., Moore, P., Mughal, M., Mujadidi, Y. F., Holliday, K., Osanlou, O., Osanlou, R., Owens, D. R., Pacurar, M., Palfreeman, A., Pan, D., Rampling, T., Regan, K., Saich, S., Bawa, T., Saralaya, D., Sharma, S., Sheridan, R., Maallah, M., Thomson, E. C., Todd, S., Twelves, C., Read, R. C., Charlton, S., Hallis, B., Ramsay, M., Andrews, N., Lambe, T., Nguyen-Van-Tam, J. S., Snape, M. D., Liu, X., Faust, S. N., Riordan, A., Ustianowski, A., Rogers, C., Katechia, K., Cooper, A., Freedman, A., Hughes, R., Grundy, L., Jones, L. T., Harrison, E., Snashall, E., Mallon, L., Burton, K., Storton, K., Munusamy, M., Tandy, B., Egbo, A., Cox, S., Ahmed, N. N., Shenoy, A., Bousfield, R., Wixted, D., Gutteridge, H., Mansfield, B., Herbert, C., Murira, J., Calderwood, J., Barker, D., Brandon, J., Tulloch, H., Colquhoun, S., Thorp, H., Radford, H., Evans, J., Baker, H., Thorpe, J., Batham, S., Hailstone, J., Phillips, R., Kumar, D., Westwell, F., Sturdy, A., Barcella, L., Soussi, N., Mpelembue, M., Raj, S., Sharma, R., Corrah, T., John, L., Whittington, A., Roche, S., Wagstaff, L., Farrier, A., Bisnauthsing, K., Abeywickrama, M., Spence, N., Packham, A., Serafimova, T., Aslam, S., McGreevy, C., Borca, A., DeLosSantosDominguez, P., Palmer, E., Broadhead, S., Farooqi, S., Piper, J., Weighell, R., Pickup, L., Shamtally, D., Domingo, J., Kourampa, E., Hale, C., Gibney, J., Stackpoole, M., Rashid-Gardner, Z., Lyon, R., McDonnell, C., Cole, C., Stewart, A., McMillan, G., Savage, M., Beckett, H., Moorbey, C., Desai, A., Brown, C., Naker, K., Gokani, K., Trinham, C., Sabine, C., Moore, S., Hurdover, S., Justice, E., Stone, M., Plested, E., Silva, C. F. D., White, R., Robinson, H., Turnbull, I., Morshead, G., Drake-Brockman, R., Smith, C., Li, G., Kasanyinga, M., Clutterbuck, E. A., Bibi, S., Singh, M., Champaneri, T., Irwin, M., Khan, M., Kownacka, A., Nabunjo, M., Osuji, C., Hladkiwskyj, J., Galvin, D., Patel, G., Grierson, J., Males, S., Askoolam, K., Barry, J., Mouland, J., Longhurst, B., Moon, M., Giddins, B., Alves, C. P. D., Richmond, L., Minnis, C., Baryschpolec, S., Elliott, S., Fox, L., Graham, V., Baker, N., Godwin, K., Buttigieg, K., Knight, C., Brown, P., Lall, P., Shaik, I., Chiplin, E., Brunt, E., Leung, S., Allen, L., Thomas, S., Fraser, S., Choi, B., Gouriet, J., Perkins, J., Gowland, A., Macdonald, J., Seenan, J. P., Starinskij, I., Seaton, A., Peters, E., Singh, S., Gardside, B., Bonnaud, A., Davies, C., Gordon, E., Keenan, S., Hall, J., Wilkins, S., Tasker, S., James, R., Seath, I., Littlewood, K., Newman, J., Boubriak, I., Suggitt, D., Haydock, H., Bennett, S., Woodyatt, W., Hughes, K., Bell, J., Coughlan, T., Welsenes, D. V., Kamal, M., Cooper, C., Tunstall, S., Ronan, N., Cutts, R., Dare, T., Yim, Y. T. N., Whittley, S., Hamal, S., Ricamara, M., Adams, K., Baker, H., Driver, K., Turner, N., Rawlins, T., Roy, S., Merida-Morillas, M., Sakagami, Y., Andrews, A., Goncalvescordeiro, L., Stokes, M., Ambihapathy, W., Spencer, J., Parungao, N., Berry, L., Cullinane, J., Presland, L., Russell, A. R., Warren, S., Baker, J., Oliver, A., Buadi, A., Lee, K., Haskell, L., Romani, R., Bentley, I., Whitbred, T., Fowler, S., Gavin, J., Magee, A., Watson, T., Nightingale, K., Marius, P., Summerton, E., Locke, E., Honey, T., Lingwood, A., Haye, A. D. L., Elliott, R. S., Underwood, K., King, M., Davies-Dear, S., Horsfall, E., Chalwin, O., Burton, H., Edwards, C. J., Welham, B., Appleby, K., Dineen, E., Garrahy, S., Hall, F., Ladikou, E., Mullan, D., Hansen, D., Campbell, M., Santos, F. D., Lakeman, N., Branney, D., Vamplew, L., Hogan, A., Frankham, J., Wiselka, M., Vail, D., Wenn, V., Renals, V., Ellis, K., Lewis-Taylor, J., Habash-Bailey, H., Magan, J. & Hardy, A., 1 Awst 2022, Yn: Lancet Infectious Diseases. 22, 8, t. 1131-1141 11 t.

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

Safety-net benefits conferred on difficult-to-fail-and-unwind banks in the US and EU before and during the great recession

Carbo-Valverde, S., Kane, E. & Rodriguez, F., 1 Gorff 2011, Yn: Journal of Banking and Finance.

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

Sailing: Cognition, Action, Communication

Tenbrink, T. & Dylla, F., 31 Awst 2017, Yn: Journal of Spatial Information Science. 15, t. 3-33

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

Salicylate 5-hydroxylase from Ralstonia sp strain U2: a monoowygenase with close relationships to and shared electron transport proteins with naphthalene dioxygenase

Zhou, N., Al-Dulayymi, J., Baird, M. & Williams, P. A., 1 Maw 2002, Yn: Journal of Bacteriology. 184, 6, t. 1547-1555

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

Salinity drives meiofaunal community structure dynamics across the Baltic ecosystem

Broman, E., Raymond, C., Sommer, C., Gunnarsson, J. S., Creer, S. & Nascimento, F. J. A., Awst 2019, Yn: Molecular Ecology. 28, 16, t. 3813-3829 17 t.

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

Saliva IgA response to prolonged exercise in a hot environment in trained cyclists.

Laing, S. J., Gwynne, D., Blackwell, J., Williams, M., Walters, R. & Walsh, N. P., 1 Maw 2005, Yn: European Journal of Applied Physiology. 93, 5-6, t. 665-671

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

Saliva flow rate, total protein concentration and osmolality as potential markers of whole body hydration status during progressive acute dehydration in humans.

Walsh, N. P., Montague, J. C., Callow, N. & Rowlands, A. V., 1 Chwef 2004, Yn: Archives of Oral Biology. 49, 2, t. 149-154

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

Saliva indices track hypohydration during 48 h of fluid restriction or combined fluid and energy restriction.

Oliver, S. J., Laing, S., Wilson, S., Bilzon, J. L. & Walsh, N., 1 Hyd 2008, Yn: Archives of Oral Biology. 53, 10, t. 975-980

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

Saliva parameters as potential indices of hydration status during acute dehydration

Walsh, N. P., Laing, S., Oliver, S. J., Montague, J. C., Walters, R. & Bilzon, J. L., 1 Medi 2004, Yn: Medicine and Science in Sports and Exercise. 36, 9, t. 1535-1542

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

Salivary IgA response to prolonged exercise in a cold environment in trained cyclists.

Walsh, N. P., Bishop, N. C., Blackwell, J., Wierzbicki, S. G. & Montague, J. C., 1 Ion 2002, Yn: Medicine and Science in Sports and Exercise. 34, 10, t. 1632-1637

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

Salivary immunoglobulin A response at rest and after exercise following a 48 h period of fluid and/or energy restriction.

Oliver, S. J., Laing, S. J., Wilson, S., Bilzon, J. L., Walters, R. & Walsh, N. P., 1 Meh 2007, Yn: British Journal of Nutrition. 97, 6, t. 1109-1116

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

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

Salivary testosterone is related to self-selected training load in elite female athletes

Cook, C. J. & Beaven, C. M., 27 Mai 2013, Yn: Physiology and Behavior. 116-117, t. 8-12

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

Salt Removal - Last Word.

Thomas, D. N., 21 Hyd 2000, Yn: New Scientist.

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

Salt Stress-Induced Loss of Iron Oxidoreduction Activities and Reacquisition of That Phenotype Depend on rus Operon Transcription in Acidithiobacillus ferridurans

Bonnefoy, V., Grail, B. M. & Johnson, D. B., Ebr 2018, Yn: Applied and Environmental Microbiology. 84, 7

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

Salt-lick-induced soil disturbance in the Teton wilderness, USA.

Walters, D. K. & DeLuca, T. H., 1 Tach 2007, Yn: Rangeland Ecology and Management. 60, 6, t. 675-679

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

Salt-marsh reconstructions of relative sea-level change in the North Atlantic during the last 2000 years

Barlow, N. L. M., Long, A. J., Saher, M. H., Gehrels, W. R., Garnett, M. H. & Scaife, R. G., 1 Medi 2014, Yn: Quaternary Science Reviews. 99, t. 1-16

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

Saltmarsh resilience to periodic shifts in tidal channels

Ladd, C. J. T., Duggan Edwards, M., Pages, J. F. & Skov, M., 20 Hyd 2021, Yn: Frontiers in Marine Science. 8, 13 t., 757715.

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

Saltwater intrusion induces shifts in soil microbial diversity and carbon use efficiency in a coastal grassland ecosystem

Brown, R. W., Rhymes, J. M. & Jones, D. L., Gorff 2022, Yn: Soil Biology and Biochemistry. 170, 108700.

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

Same data, different analysts: variation in effect sizes due to analytical decisions in ecology and evolutionary biology

Gould, E., Fraser, H. S., Parker, T. H., Nakagawa, S., Griffith, S. C., Vesk, P. A., Fidler, F., Hamilton, D. G., Abbey-Lee, R. N., Abbott, J. K., Aguirre, L. A., Alcaraz, C., Aloni, I., Altschul, D., Arekar, K., Atkins, J. W., Atkinson, J., Baker, C. M., Barrett, M., Bell, K., Bello, S. K., Beltrán, I., Berauer, B. J., Bertram, M. G., Billman, P. D., Blake, C. K., Blake, S., Bliard, L., Bonisoli-Alquati, A., Bonnet, T., Bordes, C. N. M., Bose, A. P. H., Botterill-James, T., Boyd, M. A., Boyle, S. A., Bradfer-Lawrence, T., Bradham, J., Brand, J. A., Brengdahl, M. I., Bulla, M., Bussière, L., Camerlenghi, E., Campbell, S. E., Campos, L. L. F., Caravaggi, A., Cardoso, P., Carroll, C. J. W., Catanach, T. A., Chen, X., Chik, H. Y. J., Choy, E. S., Christie, A. P., Chuang, A., Chunco, A. J., Clark, B. L., Contina, A., Covernton, G. A., Cox, M. P., Cressman, K. A., Crotti, M., Crouch, C. D., D'Amelio, P. B., de Sousa, A. A., Döbert, T. F., Dobler, R., Dobson, A. J., Doherty, T. S., Drobniak, S. M., Duffy, A. G., Duncan, A. B., Dunn, R. P., Dunning, J., Dutta, T., Eberhart-Hertel, L., Elmore, J. A., Elsherif, M. M., English, H. M., Ensminger, D. C., Ernst, U. R., Ferguson, S. M., Fernandez-Juricic, E., Ferreira-Arruda, T., Fieberg, J., Finch, E. A., Fiorenza, E. A., Fisher, D. N., Fontaine, A., Forstmeier, W., Fourcade, Y., Frank, G. S., Freund, C. A., Fuentes-Lillo, E., Gandy, S. L., Gannon, D. G., García-Cervigón, A. I., Garretson, A. C., Ge, X., Geary, W. L., Géron, C., Gilles, M., Girndt, A., Gliksman, D., Goldspiel, H. B., Gomes, D. G. E., Good, M. K., Goslee, S. C., Gosnell, J. S., Grames, E. M., Gratton, P., Grebe, N. M., Greenler, S. M., Griffioen, M., Griffith, D. M., Griffith, F. J., Grossman, J. J., Güncan, A., Haesen, S., Hagan, J. G., Hager, H. A., Harris, J. P., Harrison, N. D., Hasnain, S. S., Havird, J. C., Heaton, A. J., Herrera-Chaustre, M. L., Howard, T. J., Hsu, B.-Y., Iannarilli, F., Iranzo, E. C., Iverson, E. N. K., Jimoh, S. O., Johnson, D. H., Johnsson, M., Jorna, J., Jucker, T., Jung, M., Kačergytė, I., Kaltz, O., Ke, A., Kelly, C. D., Keogan, K., Keppeler, F. W., Killion, A. K., Kim, D., Kochan, D. P., Korsten, P., Kothari, S., Kuppler, J., Kusch, J. M., Lagisz, M., Lalla, K. M., Larkin, D. J., Larson, C. L., Lauck, K. S., Lauterbur, M. E., Law, A., Léandri-Breton, D.-J., Lembrechts, J. J., L'Herpiniere, K., Lievens, E. J. P., de Lima, D. O., Lindsay, S., Luquet, M., MacLeod, R., Macphie, K. H., Magellan, K., Mair, M. M., Malm, L. E., Mammola, S., Mandeville, C. P., Manhart, M., Manrique-Garzon, L. M., Mäntylä, E., Marchand, P., Marshall, B. M., Martin, C. A., Martin, D. A., Martin, J. M., Martinig, A. R., McCallum, E. S., McCauley, M., McNew, S. M., Meiners, S. J., Merkling, T., Michelangeli, M., Moiron, M., Moreira, B., Mortensen, J., Mos, B., Muraina, T. O., Murphy, P. W., Nelli, L., Niemelä, P., Nightingale, J., Nilsonne, G., Nolazco, S., Nooten, S. S., Novotny, J. L., Olin, A. B., Organ, C. L., Ostevik, K. L., Palacio, F. X., Paquet, M., Parker, D. J., Pascall, D. J., Pasquarella, V. J., Paterson, J. H., Payo-Payo, A., Pedersen, K. M., Perez, G., Perry, K. I., Pottier, P., Proulx, M. J., Proulx, R., Pruett, J. L., Ramananjato, V., Randimbiarison, F. T., Razafindratsima, O. H., Rennison, D. J., Riva, F., Riyahi, S., Roast, M. J., Rocha, F. P., Roche, D. G., Román-Palacios, C., Rosenberg, M. S., Ross, J., Rowland, F. E., Rugemalila, D., Russell, A. L., Ruuskanen, S., Saccone, P., Sadeh, A., Salazar, S. M., Sales, K., Salmón, P., Sánchez-Tójar, A., Santos, L. P., Santostefano, F., Schilling, H. T., Schmidt, M., Schmoll, T., Schneider, A. C., Schrock, A. E., Schroeder, J., Schtickzelle, N., Schultz, N. L., Scott, D. A., Scroggie, M. P., Shapiro, J. T., Sharma, N., Shearer, C. L., Simón, D., Sitvarin, M. I., Skupien, F. L., Slinn, H. L., Smith, G. P., Smith, J. A., Sollmann, R., Whitney, K. S., Still, S. M., Stuber, E. F., Sutton, G. F., Swallow, B., Taff, C. C., Takola, E., Tanentzap, A. J., Tarjuelo, R., Telford, R. J., Thawley, C. J., Thierry, H., Thomson, J., Tidau, S., Tompkins, E. M., Tortorelli, C. M., Trlica, A., Turnell, B. R., Urban, L., Van de Vondel, S., van der Wal, J. E. M., Van Eeckhoven, J., van Oordt, F., Vanderwel, K. M., Vanderwel, M. C., Vanderwolf, K. J., Vélez, J., Vergara-Florez, D. C., Verrelli, B. C., Vieira, M. V., Villamil, N., Vitali, V., Vollering, J., Walker, J., Walker, X. J., Walter, J. A., Waryszak, P., Weaver, R. J., Wedegärtner, R. E. M., Weller, D. L., Whelan, S., White, R. L., Wolfson, D. W., Wood, A., Yanco, S. W., Yen, J. D. L., Youngflesh, C., Zilio, G., Zimmer, C., Zimmerman, G. M. & Zitomer, R. A., 6 Chwef 2025, Yn: BMC Biology. 23, 1, 35.

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

Sammenheng mellom intensitet og effekt av atferdbehandling for barn med autisme.

Eldevik, S., Hastings, R. P., Hughes, J. C., Jahr, E. & Eikeseth, S., 1 Ion 2008, Yn: Norsk Tidsskrift for Atferdsanalyse. 35, 3, t. 121-129

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

Sample richness and genetic diversity as drivers of chimera formation in nSSU metagenetic analyses

Fonseca, V. G., Nichols, B., Lallias, D., Quince, C., Carvalho, G. R., Power, D. M. & Creer, S., 25 Ion 2012, Yn: Nucleic Acids Research. 40, 9, t. e66

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

Sample size effects on the assessment of eukaryotic diversity and community structure in aquatic sediments using high-throughput sequencing

Nascimento, F. J. A., Lallias, D., Bik, H. M. & Creer, S., 6 Awst 2018, Yn: Scientific Reports. 8

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

Sample size for regression analyses of theory of planned behaviour studies: Case of prescribing in general practice.

Russell, I. T., Rashidian, A., Miles, J., Russell, D. & Russell, I., 1 Tach 2006, Yn: British Journal of Health Psychology. 11, 4, t. 581-593

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

Sample volume misregistration in linear array-based dual beam Doppler ultrasound systems.

Fish, P., Steel, R. & Fish, P. J., 1 Gorff 2003, Yn: IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control. 50, 7, t. 836-847

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

Sampling root exudates - Mission impossible?

Jones, D. L. & Oburger, E., 30 Meh 2018, Yn: Rhizosphere. 6, t. 116-133

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

Sampling, storage and laboratory approaches for dissolved organic matter characterisation in freshwaters: Moving from nutrient fraction to molecular-scale characterisation

Lloyd, C. E. M., Johnes, P. J., Pemberton, J. A., Yates, C. A., Evershed, R. P. & Jones, D. L., 25 Meh 2022, Yn: Science of the Total Environment. 827, 154105.

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

Santiago García (trans. Bruce Campbell), On the Graphic Novel

Miranda-Barreiro, D., 1 Medi 2017, Yn: European Comic Art. 10, 2, t. 103-106

Allbwn ymchwil: Cyfraniad at gyfnodolyn › Adolygiad Llyfr/Ffilm/Erthygl

Saprolegnia parasitica zoospore activity and host survival indicates isolate variation in host preference

Matthews, E., Ellison, A. & Cable, J., Ebr 2021, Yn: Fungal Biology. 125, 4, t. 260-268

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

Sarah Ralfs: Theatralität der Existenz. Ethik und Ästhetik bei Christoph Schlingensief

Pogoda, S., 1 Ebr 2023, Yn: [rezens.tfm]. 2023, 1

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

Sarcoplasmic reticulum function and muscle contractile character following fatiguing exercise in humans.

Hill, C. A., Thompson, M. W., Ruell, P. A., Thom, J. M. & White, M. J., 15 Maw 2001, Yn: Journal of Physiology. 531, 3, t. 871-878

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