Arne Astrup

Affiliations
  • Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.

Publications (56)

Multi-trait analysis characterizes the genetics of thyroid function and identifies causal associations with clinical implications.

Nature communications
Avec: Rosalie B T M Sterenborg , Inga Steinbrenner , Yong Li , Melissa N Bujnis , Tatsuhiko Naito , Eirini Marouli , Tessel E Galesloot , Oladapo Babajide , Laura Andreasen , Arne Astrup , Bjørn Olav Åsvold , Stefania Bandinelli , Marian Beekman , John P Beilby , Jette Bork-Jensen , Thibaud Boutin , Jennifer A Brody , Suzanne J Brown , Ben Brumpton , Purdey J Campbell , Anne R Cappola , Graziano Ceresini , Layal Chaker , Daniel I Chasman , Maria Pina Concas , Rodrigo Coutinho de Almeida , Simone M Cross , Francesco Cucca , Ian J Deary , Alisa Devedzic Kjaergaard , Justin B Echouffo Tcheugui , Christina Ellervik , Johan G Eriksson , Luigi Ferrucci , Jan Freudenberg , Auteur inconnu , Auteur inconnu , Christian Fuchsberger , Christian Gieger , Franco Giulianini , Martin Gögele , Sarah E Graham , Niels Grarup , Ivana Gunjača , Torben Hansen , Barbara N Harding , Sarah E Harris , Stig Haunsø , Caroline Hayward , Jennie Hui , Till Ittermann , J Wouter Jukema , Eero Kajantie , Jørgen K Kanters , Line L Kårhus , Lambertus A L M Kiemeney , Margreet Kloppenburg , Brigitte Kühnel , Jari Lahti , Claudia Langenberg , Bruno Lapauw , Graham Leese , Shuo Li , David C M Liewald , Allan Linneberg , Jesus V T Lominchar , Jian'an Luan , Nicholas G Martin , Antonela Matana , Marcel E Meima , Thomas Meitinger , Ingrid Meulenbelt , Braxton D Mitchell , Line T Møllehave , Samia Mora , Silvia Naitza , Matthias Nauck , Romana T Netea-Maier , Raymond Noordam , Casia Nursyifa , Yukinori Okada , Stefano Onano , Areti Papadopoulou , Colin N A Palmer , Cristian Pattaro , Oluf Pedersen , Annette Peters , Maik Pietzner , Ozren Polašek , Peter P Pramstaller , Bruce M Psaty , Ante Punda , Debashree Ray , Paul Redmond , J Brent Richards , Paul M Ridker , Tom C Russ , Kathleen A Ryan , Morten Salling Olesen , Ulla T Schultheiss , Elizabeth Selvin , Moneeza K Siddiqui , Carlo Sidore , P Eline Slagboom , Thorkild I A Sørensen , Enrique Soto-Pedre , Tim D Spector , Beatrice Spedicati , Sundararajan Srinivasan , John M Starr , David J Stott , Toshiko Tanaka , Vesela Torlak , Stella Trompet , Johanna Tuhkanen , André G Uitterlinden , Erik B van den Akker , Tibbert van den Eynde , Melanie M van der Klauw , Diana van Heemst , Charlotte Verroken , W Edward Visser , Dina Vojinovic , Henry Völzke , Melanie Waldenberger , John P Walsh , Nicholas J Wareham , Stefan Weiss , Cristen J Willer , Scott G Wilson , Bruce H R Wolffenbuttel , Hanneke J C M Wouters , Margaret J Wright , Qiong Yang , Tatijana Zemunik , Wei Zhou , Gu Zhu , Sebastian Zöllner , Johannes W A Smit , Robin P Peeters , Anna Köttgen , Alexander Teumer , Marco Medici

Short-term effect of the New Nordic Renal Diet on phosphorus homoeostasis in chronic kidney disease Stages 3 and 4.

Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association

Réseau de co-auteurs

Wim H M Saris 7 collaborations
Armand Valsesia 6 collaborations
Christian Ritz 5 collaborations
Faidon Magkos 5 collaborations
Amirsalar Samkani 5 collaborations
Sten Madsbad 5 collaborations
Thomas M Larsen 5 collaborations
Thure Krarup 5 collaborations
Mads F Hjorth 5 collaborations
Ellen E Blaak 4 collaborations
None None 4 collaborations
Dominique Langin 4 collaborations
Anders Sjödin 4 collaborations
Louise Kjølbæk 4 collaborations
Jens J Holst 4 collaborations
Gijs H Goossens 3 collaborations
Thea Toft Hansen 3 collaborations
Jordi Salas-Salvadó 3 collaborations
Gerhard Liebisch 3 collaborations
Silke Matysik 3 collaborations
Simone Rampelli 3 collaborations
Lesli H Larsen 3 collaborations
Jörg Hager 3 collaborations
Nina R W Geiker 3 collaborations
Nathalie Viguerie 3 collaborations
Bekzod Khakimov 3 collaborations
Niels Grarup 3 collaborations
Torben Hansen 3 collaborations
Oluf Pedersen 3 collaborations
Mads J Skytte 3 collaborations
Jan Frystyk 3 collaborations
Mads N Thomsen 3 collaborations
Steen B Haugaard 3 collaborations
Louise Salomo 3 collaborations
Marianne Rix 3 collaborations
Anne-Lise Kamper 3 collaborations
Henrik M Roager 3 collaborations
Walter C Willett 3 collaborations
Nicole Vogelzangs 2 collaborations
Birgitta W van der Kolk 2 collaborations
Johan W E Jocken 2 collaborations
Simone J P M Eussen 2 collaborations
Coen D A Stehouwer 2 collaborations
Ilja C W Arts 2 collaborations
Mads Fiil Hjorth 2 collaborations
Sarah Vold Andersen 2 collaborations
Mònica Bulló 2 collaborations
Alfonso Benítez-Páez 2 collaborations
Eva M Gómez Del Pulgar 2 collaborations
Lena K Brahe 2 collaborations
Patrizia Brigidi 2 collaborations
Yolanda Sanz 2 collaborations
Jérôme Carayol 2 collaborations
Helle Zingenberg 2 collaborations
Jens Svare 2 collaborations
Elizaveta Chabanova 2 collaborations
Henrik S Thomsen 2 collaborations
A Astrup 2 collaborations
Sébastien Bailly 2 collaborations
Odile Fabre 2 collaborations
Rémy Legrand 2 collaborations
Laurent Pantagis 2 collaborations
Robin Terrail 2 collaborations
Jean-Louis Pépin 2 collaborations
Claire Laurens 2 collaborations
Cedric Moro 2 collaborations
Rebekka Thøgersen 2 collaborations
Klaus Juhl Jensen 2 collaborations
Marianne Hammershøj 2 collaborations
Anne Raben 2 collaborations
Hanne Christine Bertram 2 collaborations
Søren Balling Engelsen 2 collaborations
Jette Bork-Jensen 2 collaborations
Allan Linneberg 2 collaborations
Thorkild I A Sørensen 2 collaborations
Mogens Fenger 2 collaborations
Sabrina Krautbauer 2 collaborations
Hans-Frieder Schött 2 collaborations
Line Q Bendtsen 2 collaborations
James O Hill 2 collaborations
Janet C King 2 collaborations
Jeff S Volek 2 collaborations
Ronald M Krauss 2 collaborations
Nikita Misella Hansen 2 collaborations
Bo Feldt-Rasmussen 2 collaborations
Alan W Barclay 2 collaborations
Livia S A Augustin 2 collaborations
Furio Brighenti 2 collaborations
John L Sievenpiper 2 collaborations
Thomas M S Wolever 2 collaborations
Antonio Ceriello 2 collaborations
Cyril W C Kendall 2 collaborations
Carlo La Vecchia 2 collaborations
Geoffrey Livesey 2 collaborations
Andrea Poli 2 collaborations
Gabriele Riccardi 2 collaborations
Antonia Trichopoulou 2 collaborations
David J A Jenkins 2 collaborations
Jennie C Brand-Miller 2 collaborations
Helena Deriš 2 collaborations
Petra Tominac 2 collaborations
Frano Vučković 2 collaborations
Gordan Lauc 2 collaborations
Ivan Gudelj 2 collaborations
Lars Christensen 2 collaborations
Dennis S Nielsen 2 collaborations
Lukasz Krych 2 collaborations
Thomas Meinert Larsen 2 collaborations
Steen Bendix Haugaard 2 collaborations
Nicolaas C Schaper 1 collaboration
Ronald M A Henry 1 collaboration
Thomas Hankemeier 1 collaboration
Justyna Godos 1 collaboration
Agnieszka Micek 1 collaboration
Tomasz Brzostek 1 collaboration
Estefania Toledo 1 collaboration
Licia Iacoviello 1 collaboration
Oscar H Franco 1 collaboration
Fabio Galvano 1 collaboration
Giuseppe Grosso 1 collaboration
Marianthi Kalafati 1 collaboration
Michiel Adriaens 1 collaboration
Casper G Schalkwijk 1 collaboration
Chris T Evelo 1 collaboration
Karoline Sandby 1 collaboration
Joanne A Harrold 1 collaboration
Jason C G Halford 1 collaboration
Joan Vermeiren 1 collaboration
Roland Bruderer 1 collaboration
Jan Muntel 1 collaboration
Sebastian Müller 1 collaboration
Oliver M Bernhardt 1 collaboration
Tejas Gandhi 1 collaboration
Ornella Cominetti 1 collaboration
Charlotte Macron 1 collaboration
Oliver Rinner 1 collaboration
Loïc Dayon 1 collaboration
Lukas Reiter 1 collaboration
Francesco Capozzi 1 collaboration
Fabio Fava 1 collaboration
Gregorio Paolo Milani 1 collaboration
Carlo Agostoni 1 collaboration
Israel Sam Saguy 1 collaboration
A Pramono 1 collaboration
J W E Jocken 1 collaboration
M E Adriaens 1 collaboration
M F Hjorth 1 collaboration
W H M Saris 1 collaboration
E E Blaak 1 collaboration
Henrik Gudbergsen 1 collaboration
Anders Overgaard 1 collaboration
Marius Henriksen 1 collaboration
Eva Ejlersen Wæhrens 1 collaboration
Henning Bliddal 1 collaboration
Robin Christensen 1 collaboration
Sabrina Mai Nielsen 1 collaboration
Mikael Boesen 1 collaboration
Filip Krag Knop 1 collaboration
Cecilie Bartholdy 1 collaboration
Karen Ellegaard 1 collaboration
Else Marie Bartels 1 collaboration
Lars Erik Kristensen 1 collaboration
Monique Mendelson 1 collaboration
Renaud Tamisier 1 collaboration
Karine Clément 1 collaboration
Alyssa Imbert 1 collaboration
Nathalie Vialaneix 1 collaboration
Julien Marquis 1 collaboration
Julie Vion 1 collaboration
Aline Charpagne 1 collaboration
Sylviane Metairon 1 collaboration
Nathalie Boulet 1 collaboration
Ondine Walter 1 collaboration
Grégory Lefebvre 1 collaboration
Ida Emilie I Lindahl 1 collaboration
C A Monteiro 1 collaboration
Mallory Cals-Maurette 1 collaboration
Kristina Pigsborg 1 collaboration
Samuel Demharter 1 collaboration
Mona Adnan Aldubayan 1 collaboration
Alessia Trimigno 1 collaboration
Lars Ove Dragsted 1 collaboration
Inga Steinbrenner 1 collaboration
Yong Li 1 collaboration
Melissa N Bujnis 1 collaboration
Tatsuhiko Naito 1 collaboration
Eirini Marouli 1 collaboration
Tessel E Galesloot 1 collaboration
Oladapo Babajide 1 collaboration
Laura Andreasen 1 collaboration
Bjørn Olav Åsvold 1 collaboration
Stefania Bandinelli 1 collaboration
Marian Beekman 1 collaboration
John P Beilby 1 collaboration
Thibaud Boutin 1 collaboration
Jennifer A Brody 1 collaboration
Suzanne J Brown 1 collaboration
Ben Brumpton 1 collaboration
Purdey J Campbell 1 collaboration
Anne R Cappola 1 collaboration
Graziano Ceresini 1 collaboration
Layal Chaker 1 collaboration
Daniel I Chasman 1 collaboration
Maria Pina Concas 1 collaboration
Simone M Cross 1 collaboration
Francesco Cucca 1 collaboration
Ian J Deary 1 collaboration
Christina Ellervik 1 collaboration
Johan G Eriksson 1 collaboration
Luigi Ferrucci 1 collaboration
Jan Freudenberg 1 collaboration
Christian Fuchsberger 1 collaboration
Christian Gieger 1 collaboration
Franco Giulianini 1 collaboration
Martin Gögele 1 collaboration
Sarah E Graham 1 collaboration
Ivana Gunjača 1 collaboration
Barbara N Harding 1 collaboration
Sarah E Harris 1 collaboration
Stig Haunsø 1 collaboration
Caroline Hayward 1 collaboration
Jennie Hui 1 collaboration
Till Ittermann 1 collaboration
J Wouter Jukema 1 collaboration
Eero Kajantie 1 collaboration
Jørgen K Kanters 1 collaboration
Line L Kårhus 1 collaboration
Margreet Kloppenburg 1 collaboration
Brigitte Kühnel 1 collaboration
Jari Lahti 1 collaboration
Claudia Langenberg 1 collaboration
Bruno Lapauw 1 collaboration
Graham Leese 1 collaboration
Shuo Li 1 collaboration
David C M Liewald 1 collaboration
Jesus V T Lominchar 1 collaboration
Jian'an Luan 1 collaboration
Nicholas G Martin 1 collaboration
Antonela Matana 1 collaboration
Marcel E Meima 1 collaboration
Thomas Meitinger 1 collaboration
Ingrid Meulenbelt 1 collaboration
Braxton D Mitchell 1 collaboration
Line T Møllehave 1 collaboration
Samia Mora 1 collaboration
Silvia Naitza 1 collaboration
Matthias Nauck 1 collaboration
Romana T Netea-Maier 1 collaboration
Raymond Noordam 1 collaboration
Casia Nursyifa 1 collaboration
Yukinori Okada 1 collaboration
Stefano Onano 1 collaboration
Areti Papadopoulou 1 collaboration
Colin N A Palmer 1 collaboration
Cristian Pattaro 1 collaboration
Annette Peters 1 collaboration
Maik Pietzner 1 collaboration
Ozren Polašek 1 collaboration
Peter P Pramstaller 1 collaboration
Bruce M Psaty 1 collaboration
Ante Punda 1 collaboration
Debashree Ray 1 collaboration
Paul Redmond 1 collaboration
J Brent Richards 1 collaboration
Paul M Ridker 1 collaboration
Tom C Russ 1 collaboration
Kathleen A Ryan 1 collaboration
Morten Salling Olesen 1 collaboration
Ulla T Schultheiss 1 collaboration
Elizabeth Selvin 1 collaboration
Moneeza K Siddiqui 1 collaboration
Carlo Sidore 1 collaboration
P Eline Slagboom 1 collaboration
Enrique Soto-Pedre 1 collaboration
Tim D Spector 1 collaboration
Beatrice Spedicati 1 collaboration
John M Starr 1 collaboration
David J Stott 1 collaboration
Toshiko Tanaka 1 collaboration
Vesela Torlak 1 collaboration
Stella Trompet 1 collaboration
Johanna Tuhkanen 1 collaboration
André G Uitterlinden 1 collaboration
Erik B van den Akker 1 collaboration
Tibbert van den Eynde 1 collaboration
Diana van Heemst 1 collaboration
Charlotte Verroken 1 collaboration
W Edward Visser 1 collaboration
Dina Vojinovic 1 collaboration
Henry Völzke 1 collaboration
Melanie Waldenberger 1 collaboration
John P Walsh 1 collaboration
Nicholas J Wareham 1 collaboration
Stefan Weiss 1 collaboration
Cristen J Willer 1 collaboration
Scott G Wilson 1 collaboration
Hanneke J C M Wouters 1 collaboration
Margaret J Wright 1 collaboration
Qiong Yang 1 collaboration
Tatijana Zemunik 1 collaboration
Wei Zhou 1 collaboration
Gu Zhu 1 collaboration
Sebastian Zöllner 1 collaboration
Johannes W A Smit 1 collaboration
Robin P Peeters 1 collaboration
Anna Köttgen 1 collaboration
Alexander Teumer 1 collaboration
Marco Medici 1 collaboration
Jens F Rehfeld 1 collaboration
Keith Burling 1 collaboration
Louise Kjølbaek 1 collaboration
Francois Blachier 1 collaboration
Martin Beaumont 1 collaboration
Max Nieuwdorp 1 collaboration
Annick Hartstra 1 collaboration
Uberto Pagotto 1 collaboration
Patricia Iozzo 1 collaboration
Jesper Q Thomassen 1 collaboration
Jens J Sloth 1 collaboration
Josephine Gade 1 collaboration
Anne Marie Beck 1 collaboration
Hanne E Andersen 1 collaboration
Britt Christensen 1 collaboration
Finn Rønholt 1 collaboration
Tobias W Klausen 1 collaboration
Anders Vinther 1 collaboration
Amy D Petersen 1 collaboration
Trine Blædel 1 collaboration
Janne K Lorenzen 1 collaboration
Jacob B Holm 1 collaboration
Pia Kiilerich 1 collaboration
Karsten Kristiansen 1 collaboration
Ewelina Rogozińska 1 collaboration
Javier Zamora 1 collaboration
Nadine Marlin 1 collaboration
Ana Pilar Betrán 1 collaboration
Annick Bogaerts 1 collaboration
Jose G Cecatti 1 collaboration
Jodie M Dodd 1 collaboration
Fabio Facchinetti 1 collaboration
Lene A H Haakstad 1 collaboration
Hans Hauner 1 collaboration
Dorte M Jensen 1 collaboration
Tarja I Kinnunen 1 collaboration
Ben W J Mol 1 collaboration
Julie Owens 1 collaboration
Suzanne Phelan 1 collaboration
Kristina M Renault 1 collaboration
Kjell Å Salvesen 1 collaboration
Alexis Shub 1 collaboration
Fernanda G Surita 1 collaboration
Signe N Stafne 1 collaboration
Helena Teede 1 collaboration
Christina A Vinter 1 collaboration
Khalid S Khan 1 collaboration
Shakila Thangaratinam 1 collaboration
John Blundell 1 collaboration
Tanja K Thorning 1 collaboration
Søren Reitelseder 1 collaboration
Erik T Hansen 1 collaboration
Gerrit van Hall 1 collaboration
Lars Holm 1 collaboration
Jake Turicchi 1 collaboration
Ruairi O'Driscoll 1 collaboration
Graham Finlayson 1 collaboration
Cristiana Duarte 1 collaboration
Mark Hopkins 1 collaboration
Nuno Martins 1 collaboration
Joanna Michalowska 1 collaboration
Marleen A van Baak 1 collaboration
R James Stubbs 1 collaboration
Kristine Williams 1 collaboration
Lars R Ingerslev 1 collaboration
Martin Wohlwend 1 collaboration
Ann Normann Hansen 1 collaboration
Lewin Small 1 collaboration
Rasmus Ribel-Madsen 1 collaboration
Johan Auwerx 1 collaboration
Christopher T Workman 1 collaboration
Romain Barrès 1 collaboration
Dennis M Bier 1 collaboration
J Thomas Brenna 1 collaboration
Andrew Mente 1 collaboration
Jose M Ordovas 1 collaboration
Salim Yusuf 1 collaboration
Deborah Carper 1 collaboration
Marine Coué 1 collaboration
Emmani B M Nascimento 1 collaboration
Valentin Barquissau 1 collaboration
Damien Lagarde 1 collaboration
Carine Pestourie 1 collaboration
Justine Vily Petit 1 collaboration
Maud Soty 1 collaboration
Laurent Monbrun 1 collaboration
Marie-Adeline Marques 1 collaboration
Yannick Jeanson 1 collaboration
Yannis Sainte-Marie 1 collaboration
Aline Mairal 1 collaboration
Sébastien Déjean 1 collaboration
Geneviève Tavernier 1 collaboration
Virginie Bourlier 1 collaboration
Frank Lezoualc'h 1 collaboration
Audrey Carrière 1 collaboration
Louis Casteilla 1 collaboration
Gilles Mithieux 1 collaboration
Patrick Schrauwen 1 collaboration
Harshal A Deshmukh 1 collaboration
Anne Lundager Madsen 1 collaboration
Ana Viñuela 1 collaboration
Christian Theil Have 1 collaboration
Andrea Tura 1 collaboration
Anubha Mahajan 1 collaboration
Alison J Heggie 1 collaboration
Robert W Koivula 1 collaboration
Federico De Masi 1 collaboration
Thomas Drivsholm 1 collaboration
Anette A P Gjesing 1 collaboration
Imre Pavo 1 collaboration
Andrew R Wood 1 collaboration
Hartmut Ruetten 1 collaboration
Angus G Jones 1 collaboration
Anitra D M Koopman 1 collaboration
Henna Cederberg 1 collaboration
Femke Rutters 1 collaboration
Martin Ridderstrale 1 collaboration
Markku Laakso 1 collaboration
Mark I McCarthy 1 collaboration
Tim M Frayling 1 collaboration
Ele Ferrannini 1 collaboration
Paul W Franks 1 collaboration
Ewan R Pearson 1 collaboration
Andrea Mari 1 collaboration
Mark Walker 1 collaboration
David S Ludwig 1 collaboration
Louis J Aronne 1 collaboration
Rafael de Cabo 1 collaboration
Lewis C Cantley 1 collaboration
Mark I Friedman 1 collaboration
Steven B Heymsfield 1 collaboration
James D Johnson 1 collaboration
Daniel E Lieberman 1 collaboration
Gary Taubes 1 collaboration
Eric C Westman 1 collaboration
William S Yancy 1 collaboration
Cara B Ebbeling 1 collaboration
Elizabeth Delport 1 collaboration
C Jeyakumar Henry 1 collaboration
Kathy Usic 1 collaboration
Yang Yuexin 1 collaboration
Andreea Zurbau 1 collaboration
Anette Buyken 1 collaboration
Peter R Ellis 1 collaboration
Marie-Ann Vanginkel 1 collaboration
Kalpana Bhaskaran 1 collaboration
Kristian Leth Egsgaard 1 collaboration
Carlos A Monteiro 1 collaboration
Nina Briški 1 collaboration
Jens Leipziger 1 collaboration
Mads Vaarby Sørensen 1 collaboration
Peder Berg 1 collaboration
Elisabeth A Larson 1 collaboration
Joanna Boberska 1 collaboration
Sandrine Claus 1 collaboration
Jing Guo 1 collaboration
D Ian Givens 1 collaboration
Stephan J L Bakker 1 collaboration
Mario Kratz 1 collaboration
André Marette 1 collaboration
Hanno Pijl 1 collaboration
Daniel Kandel 1 collaboration
Maria Saur Svane 1 collaboration
Stine Vuholm 1 collaboration
Mette Kristensen 1 collaboration
Richard Taylor 1 collaboration
Helen F Livesey 1 collaboration
Anette E Buyken 1 collaboration
Simin Liu 1 collaboration
Inger Björck 1 collaboration
Salwa W Rizkalla 1 collaboration
Marie-Ann Ha 1 collaboration
Sara Baer-Sinnott 1 collaboration
Yishai Zohar 1 collaboration
Lorien E Urban 1 collaboration
R Drew Sayer 1 collaboration
Bruce W Patterson 1 collaboration
Sharon J Herring 1 collaboration
Samuel Klein 1 collaboration
Babette S Zemel 1 collaboration
Gary D Foster 1 collaboration
Holly R Wyatt 1 collaboration
Evrim Acar 1 collaboration
Gözde Gürdeniz 1 collaboration
Francesco Savorani 1 collaboration
Lars O Dragsted 1 collaboration
Shannon L Klingel 1 collaboration
Marie Kunesova 1 collaboration
David M Mutch 1 collaboration
Susanne Bügel 1 collaboration
Lene Rørholm Pedersen 1 collaboration
Rasmus Huan Olsen 1 collaboration
Christian Anholm 1 collaboration
Jesper Eugen-Olsen 1 collaboration
Lene Simonsen 1 collaboration
Rosemary L Walzem 1 collaboration
Eva Prescott 1 collaboration
Mads Juul Skytte 1 collaboration
Trine Henriksen 1 collaboration
Jens Juul Holst 1 collaboration
Ove Andersen 1 collaboration
Emil List Larsen 1 collaboration
Carolyn F Deacon 1 collaboration
Hélène Ruffieux 1 collaboration
Radu Popescu 1 collaboration
Mary-Ellen Harper 1 collaboration
Robert Dent 1 collaboration
Anthony C Davison 1 collaboration
Witold Kot 1 collaboration