19 research outputs found
The role of receptor for advanced glycation endproducts (RAGE) in infection
- Author
- A. Bierhaus
- A.M. Cole
- A.M. Schmidt
- B. Liliensiek
- B.I. Hudson
- C. Bopp
- C. Cheng
- C.A. Janeway Jr
- D. Foell
- D. Frommhold
- D. Payen
- E.C. Lutterloh
- G. Cataldegirmen
- H. Fehrenbach
- H. Ueno
- H. Wang
- H. Wang
- H. Wittkowski
- H. Yang
- H. Yang
- H.E. Harris
- J. Tian
- J.M. Englert
- J.S. Park
- K. Suda
- L. Park
- M. Bianchi
- M. He
- M.A. Queisser
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.T. Goova
- M.T. Lotze
- N. Demling
- P. Morbini
- P. Scaffidi
- P.R. Reynolds
- R. Liu
- R.S. Hotchkiss
- R.S. Hotchkiss
- S. Qin
- S.T. Buckley
- T. Chavakis
- T. Uchida
- V.V. Orlova
- Y. Liu
- Publication venue
- BioMed Central
- Publication date
- 01/01/2011
- Field of study
An Observational Overview of Solar Flares
- Author
- A. Asai
- A. Asai
- A. Asai
- A. Asai
- A. Asai
- A. Bleybel
- A. Caspi
- A. Caspi
- A. Czaykowska
- A. Czaykowska
- A. Jardins Des
- A. Severny
- A. Veronig
- A. Veronig
- A. Veronig
- A. Vourlidas
- A. Vourlidas
- A. Vourlidas
- A.-C. Donea
- A.C. Lin
- A.C. Sterling
- A.C. Sterling
- A.E. Covington
- A.G. Emslie
- A.G. Emslie
- A.G. Emslie
- A.G. Emslie
- A.G. Kosovichev
- A.G. Kosovichev
- A.G. Kosovichev
- A.I. Poland
- A.L. Kiplinger
- A.M. Melo
- A.M. Veronig
- A.M. Veronig
- A.M. Veronig
- A.N. Parmar
- A.O. Benz
- A.O. Benz
- A.O. Benz
- A.R. Inglis
- A.V.R. Silva
- A.V.R. Silva
- B. Anwar
- B. De Pontieu
- B. Joshi
- B. R. Dennis
- B. Schmieder
- B. Schmieder
- B. Vršnak
- B. Vršnak
- B.E. Woodgate
- B.J. Thompson
- B.N. Handy
- B.R. Dennis
- B.R. Dennis
- B.V. Somov
- B.V. Somov
- B.W. Lites
- C. Caroubalos
- C. Chifor
- C. Debi Prasad
- C. Denker
- C. Foullon
- C. Kuckein
- C. Lindsey
- C. Liu
- C. Liu
- C. Liu
- C.H. Mandrini
- C.H. Mandrini
- C.H. Miklenic
- C.J. Schrijver
- C.J. Schrijver
- C.J. Schrijver
- C.J. Schrijver
- C.P. Catalano
- C.P. Goff
- C.R. DeVore
- C.U. Keller
- D. Alexander
- D. Alexander
- D. Maričić
- D. Moses
- D. Tripathi
- D.A. Biesecker
- D.A. Falconer
- D.B. Jess
- D.B. Jess
- D.E. Gary
- D.E. McKenzie
- D.F. Neidig
- D.G. Wentzel
- D.L. Mickey
- D.M. Smith
- D.M. Zarro
- D.M. Zarro
- D.P. Cox
- D.V. Reames
- D.W. Longcope
- D.W. Longcope
- D.W. Longcope
- E. Antonucci
- E. Vogt
- E. Wiehr
- E.H.B.M. Gronenschild
- E.J. Schmahl
- E.J. Schmahl
- E.L. Chupp
- E.N. Parker
- E.P. Kontar
- E.R. Priest
- E.W. Cliver
- E.W. Cliver
- E.W. Cliver
- E.W. Cliver
- E.W. Cliver
- F. FárnĂk
- F. FárnĂk
- F. FárnĂk
- F. Reale
- F. Rubio da Costa
- F. Tang
- F.Q. Orrall
- G. Aulanier
- G. Aulanier
- G. Barnes
- G. Barnes
- G. Cauzzi
- G. Mann
- G. Mann
- G. Poletto
- G. Zanna Del
- G.-X. Ai
- G.A. Doschek
- G.A. Doschek
- G.A. Doschek
- G.D. Holman
- G.E. Brueckner
- G.H. Fisher
- G.H. Fisher
- G.H. Fisher
- G.H.J. Oord van den
- G.J. Hurford
- G.J. Hurford
- G.J. Hurford
- G.J. Hurford
- G.K. Parks
- H. Hara
- H. Hudson
- H. Isobe
- H. Isobe
- H. Ji
- H. Ji
- H. Ji
- H. Ji
- H. Ji
- H. Koshiishi
- H. Li
- H. Lin
- H. Lin
- H. S. Hudson
- H. Wang
- H. Wang
- H. Wang
- H. Wang
- H. Zirin
- H. Zirin
- H.E. Petschek
- H.F. Beek van
- H.P. Warren
- H.P. Warren
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.S. Hudson
- H.T. ClaĂźen
- H.V. Cane
- H.W. Dodson
- I.D. Palmer
- J. Aboudarham
- J. Jing
- J. Jing
- J. Jing
- J. Lang
- J. Lee
- J. Li
- J. Qiu
- J. Qiu
- J. Qiu
- J. Sylwester
- J. Sylwester
- J. Sylwester
- J. Zhang
- J. Zhang
- J.-P. Delaboudinière
- J.-P. Meyer
- J.-P. Wuelser
- J.A. Grayson
- J.A. Miller
- J.C. Allred
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. Brown
- J.C. MartĂnez-Oliveros
- J.C. MartĂnez-Oliveros
- J.D. Graham
- J.E. Vernazza
- J.I. Khan
- J.I. Khan
- J.J. Sudol
- J.K. Thalmann
- J.L. Culhane
- J.L. Culhane
- J.L. Culhane
- J.L. Culhane
- J.L.R. Saba
- J.M. McTiernan
- J.M. McTiernan
- J.M. Wilcox
- J.P. Wild
- J.T. Mariska
- J.W. Brosius
- J.W. Brosius
- J.W. Brosius
- J.W. Harvey
- K. Harvey
- K. Hori
- K. Jir̂ička
- K. Ohki
- K. Phillips
- K. Shibasaki
- K. Wilhelm
- K.D. Leka
- K.D. Leka
- K.G. McClements
- K.J. Frost
- K.J.H. Phillips
- K.J.H. Phillips
- K.J.H. Phillips
- K.J.H. Phillips
- K.K. Reeves
- K.P. Dere
- K.P. Dere
- K.T. Strong
- L. Bone
- L. Bone
- L. Fletcher
- L. Fletcher
- L. Fletcher
- L. Fletcher
- L. Fletcher
- L. Fletcher
- L. Fletcher
- L. Golub
- L. Ofman
- L. Sui
- L. Sui
- L. Sui
- L. Teriaca
- L. Teriaca
- L.E. Orwig
- L.F. Burlaga
- L.K. Harra
- L.K. Harra
- M. Battaglia
- M. Battaglia
- M. Battaglia
- M. Gros
- M. Hesse
- M. Jin
- M. KarlickĂ˝
- M. KarlickĂ˝
- M. Kretzschmar
- M. Pick
- M. Temmer
- M. Temmer
- M. Temmer
- M. Tomczak
- M.A. Ellison
- M.D. Ding
- M.D. Ding
- M.E. Machado
- M.E. Machado
- M.E. Machado
- M.J. Aschwanden
- M.J. Aschwanden
- M.J. Aschwanden
- M.J. Aschwanden
- M.J. Aschwanden
- M.J. Hagyard
- M.J. Hagyard
- M.K. Georgoulis
- M.R. Kundu
- M.R. Kundu
- M.R. Perrenoud
- M.S. Wheatland
- M.S. Wheatland
- N. Narukage
- N. Raouafi
- N.B. Crosby
- N.D. Kostiuk
- N.D.R. Ranns
- N.R. Sheeley Jr.
- N.R. Sheeley Jr.
- O. von der Luehe
- P. DĂ©moulin
- P. DĂ©moulin
- P. DĂ©moulin
- P. DĂ©moulin
- P. Evenson
- P. Evenson
- P. Gallagher
- P. Giuliani
- P. Hoyng
- P. Kaufmann
- P. Lemaire
- P. Li
- P. Mazzotta
- P. Mein
- P. Messmer
- P. Saint-Hilaire
- P. Saint-Hilaire
- P. Saint-Hilaire
- P. T. Grigis
- P.A. Sweet
- P.C. Grigis
- P.C. Grigis
- P.C. Grigis
- P.H. Scherrer
- P.J. Baum
- P.J. Cargill
- P.L. Rochus
- P.R. Young
- P.S. McIntosh
- P.S. McIntosh
- P.T. Gallagher
- P.T. Gallagher
- Q. Chen
- Q. Fu
- Q.R. Chen
- Q.R. Chen
- R. Cameron
- R. Jain
- R. Liu
- R. O. Milligan
- R. Pallavicini
- R. Pallavicini
- R. Ramaty
- R. Ramaty
- R. Saldanha
- R.A. Harrison
- R.A. Harrison
- R.A. Howard
- R.A. Kopp
- R.A. Mewaldt
- R.A. Mewaldt
- R.A. Schwartz
- R.C. Canfield
- R.C. Canfield
- R.C. Canfield
- R.C. Carrington
- R.G. Athay
- R.G. Giovanelli
- R.J. Thomas
- R.O. Milligan
- R.O. Milligan
- R.O. Milligan
- R.O. Milligan
- R.P. Lin
- R.P. Lin
- R.P. Lin
- R.P. Lin
- R.T.J. McAteer
- S. Gburek
- S. Imada
- S. Kahler
- S. Kahler
- S. Krucker
- S. Krucker
- S. Krucker
- S. Krucker
- S. Krucker
- S. Krucker
- S. Krucker
- S. Masson
- S. Masuda
- S. Masuda
- S. RĂ©gnier
- S. RĂ©gnier
- S. RĂ©gnier
- S. Tomczyk
- S. Tsuneta
- S. Tsuneta
- S. Ueno
- S.A. Bogachev
- S.A. Matthews
- S.E. Gibson
- S.F. Martin
- S.I. Syrovatskii
- S.M. White
- S.M. White
- S.R. Kane
- S.R. Kane
- S.R. Kane
- S.R. Kane
- S.R. Kane
- T. Bai
- T. Bai
- T. Gold
- T. Hirayama
- T. Kondo
- T. Kosugi
- T. Mrozek
- T. Mrozek
- T. Sakao
- T. Sakao
- T. Sakurai
- T. Shimizu
- T. Spirock
- T. Takakura
- T. Wang
- T. Yokoyama
- T. Zhou
- T.E. Berger
- T.G. Forbes
- T.G. Forbes
- T.G. Forbes
- T.G. Moran
- T.N. Woods
- T.N. Woods
- T.R. Metcalf
- T.R. Metcalf
- T.R. Metcalf
- T.R. Metcalf
- T.R. Metcalf
- T.R. Metcalf
- T.R. Rimmele
- T.S. Bastian
- T.S. Bastian
- T.S. Bastian
- U. Feldman
- U. Feldman
- U. Feldman
- V. Bothmer
- V. Ontiveros
- V. Petrosian
- V.S. Gorbachev
- V.S. Titov
- V.V. Zharkova
- V.V. Zharkova
- W. Dröge
- W. Liu
- W. Liu
- W. Liu
- W. Liu
- W. Liu
- W. Liu
- W. Liu
- W. Otruba
- W.J. MacCombie
- W.M. Neupert
- W.P. Abbett
- X.-M. Hua
- Y. Avignon
- Y. Cui
- Y. Muraki
- Y. Su
- Y. Uchida
- Y. Wang
- Y. Xu
- Y.-H. Yang
- Y.N. Su
- Y.P. Li
- Y.P. Li
- Y.P. Li
- Y.P. Li
- Z. Ning
- Z. Ĺ vestka
- Z. Ĺ vestka
- Z. Ĺ vestka
- Z.F. Ĺ vestka
- Ă….M. Janse
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/09/2011
- Field of study
We present an overview of solar flares and associated phenomena, drawing upon
a wide range of observational data primarily from the RHESSI era. Following an
introductory discussion and overview of the status of observational
capabilities, the article is split into topical sections which deal with
different areas of flare phenomena (footpoints and ribbons, coronal sources,
relationship to coronal mass ejections) and their interconnections. We also
discuss flare soft X-ray spectroscopy and the energetics of the process. The
emphasis is to describe the observations from multiple points of view, while
bearing in mind the models that link them to each other and to theory. The
present theoretical and observational understanding of solar flares is far from
complete, so we conclude with a brief discussion of models, and a list of
missing but important observations.Comment: This is an article for a monograph on the physics of solar flares,
inspired by RHESSI observations. The individual articles are to appear in
Space Science Reviews (2011
Helicoidal flow jet flocculator
- Publication venue
- 'Informa UK Limited'
- Publication date
- Field of study
Drought monitoring
- Author
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- Field of study
Avaliação hidrodinâmica de unidade piloto de floculação mecanizada
- Author
- Publication venue
- 'FapUNIFESP (SciELO)'
- Publication date
- Field of study
The Role of Receptor for Advanced Glycation Endproducts (RAGE) in Infection
- Author
- A. Bierhaus
- A.M. Cole
- A.M. Schmidt
- B. Liliensiek
- B.I. Hudson
- C. Bopp
- C. Cheng
- C.A. Janeway Jr
- D. Foell
- D. Frommhold
- D. Payen
- E.C. Lutterloh
- G. Cataldegirmen
- H. Fehrenbach
- H. Ueno
- H. Wang
- H. Wang
- H. Wittkowski
- H. Yang
- H. Yang
- H.E. Harris
- J. Tian
- J.M. Englert
- J.S. Park
- K. Suda
- L. Park
- M. Bianchi
- M. He
- M.A. Queisser
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.A. Zoelen van
- M.T. Goova
- M.T. Lotze
- N. Demling
- P. Morbini
- P. Scaffidi
- P.R. Reynolds
- R. Liu
- R.S. Hotchkiss
- R.S. Hotchkiss
- S. Qin
- S.T. Buckley
- T. Chavakis
- T. Uchida
- V.V. Orlova
- Y. Liu
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/2011
- Field of study
An Information Society in Africa?
- Author
- Balletto B.
- Bellchambers W.H.
- Bruno M.
- Burgelman J. C.
- Burgelman J.C.
- Chossudovsky M.
- Codding G.A., Jr
- De Morgen
- Deane J.
- Dordick H.S.
- ECA (Economic Commission For Africa)
- El Sherif H.
- Feketekuty G.
- George S.
- Gert Nulens
- Hancock G.
- Haugan O.
- Hills J.
- Hudson H.E.
- Inhonvbere J.O.
- ITU (International Telecommunications Union)
- Katz R.L.
- Kelly T.
- Kessides C.
- Kruiter A.
- Leo Van Audenhove
- Lyon D.
- Maitland D.
- Maitland D.
- Mansell R.
- McQuail D.
- Melkote S.R.
- Melody W.H.
- Mosco V.
- Mowlana H.
- Mowlana H.
- Nair K.S.
- Nulens G.
- Nyamnjoh F.B.
- Parker E.B.
- Pool I.D.S.
- Reeves G.
- Rich B.
- Schiller H.
- Spicker P.
- Talero E.
- Talero E.
- Tarjanne P.
- Tavares S.
- Tehranian M.
- Traber M.
- Urey G.
- Utsumi Y.
- Van Ryckeghem D.
- Van Ryckeghem D.
- Watkins K.
- Wilson D.
- Winsbury R.
- Woherem E.
- World Bank
- World Bank
- World Bank
- World Bank
- World Bank
- World Bank
- Publication venue
- 'SAGE Publications'
- Publication date
- Field of study
Thyroid eye disease.
- Author
- Arnold K.
- Bahn R.S.
- Bahn R.S.
- Bahn R.S.
- Bahn R.S.
- Balzas C.
- Bartalena L.
- Bartalena L.
- Bartalena L.
- Bartels E.X.
- Barth A.
- Bartley G.B.
- Bernard N.F.
- Boucher A.
- Bromberg N.
- Burch H.B.
- Char D.H.
- Char D.H.
- Ciocca D.R.
- D H Char
- DeGroot U.
- DeGroot U.
- Dong Q.
- Elisei R.
- For D.A.
- Foss A.J.E.
- Fries P.D.
- GarJityFAJasoUrdi V.
- Gorman C.A.
- Hagg E.
- Heufelder A.E.
- Heufelder A.E.
- Heufelder A.E.
- Heufelder A.E.
- Heufelder A.E.
- Heufelder A.E.
- Heufelder A.E.
- Hiromatsu Y.
- Hudson H.L.
- Imai Y.
- in Persia Elgood CMedicine
- Ivy H.K.
- Kahaly G.
- Karger B.
- Karlsson F.
- Karlsson F.A.
- Kendler D.L.
- Kiljanski J.I.
- KmhsK B.J.
- Marcocci C.
- McIver B.
- McLachlan S.M.
- Mendlovic D.B.
- Metcalfe R.A.
- Metz H.S.
- Nunnery W.R.
- OhnihiT Noguhi S.
- Parmentier M.
- Paschke R.
- Paschke R.
- Peliciello A.
- Pequegnat E.P.
- Perros P.
- Peterson I.A.
- Prummel M.F.
- Prummel M.F.
- Prummel M.F.
- Ross P.B.
- Ross P.V.
- Salvi M.
- Schifferdecker E.
- Shine B.
- Sjoberg H.E.
- Sridama V.
- Tallstedt L.
- Tandon N.
- Tellez M.
- true
- Walfish P.G.
- Wall JR, Trifler
- Wall JR, Triller
- Wartofsky L.
- Weetman A.P.
- Wiersinga W.M.
- Winsa B.
- Young L.A.
- Publication venue
- 'BMJ'
- Publication date
- Field of study
Proceedings of the Conference on Water Resources: October 1-3, 1951
- Author
- Alquist E.N.
- Anderson J.
- Atlas D.
- Austin Pauline M.
- Austin Pauline M.
- Bardwell R.C.
- Bartow Edward
- Battan L.J.
- Behrman A.S.
- Bemis A.C.
- Bemis A.C.
- Bennison E.W.
- Benton George
- Beyers H.R.
- Bliss John H.
- Boucher R.J.
- Brater E.F.
- Brune Gunnar
- Buswell Arthur M.
- Chinn Orville W.
- Critchlow H.T.
- Degler Howard E.
- Dunn G.
- Einstein Hans A.
- Engle C. Hobart
- Farnsworth Gerald
- Fleisher J.S.
- Foster John W.
- Fry Albert Stevens
- Gerhardt J.B.
- Gottschalk L.C.
- Gould W.B.
- Gray Horace
- Guyton William F.
- Hazen Richard
- Hill E.F.
- Hiser Homer
- Hitschfeld W.
- Houk Ivan F.
- Howson Louis R.
- Hudson H.E., Jr.
- Jens Stifel W.
- Jones Douglas M.A.
- Jorgensen R.C.
- Jorgensen R.E.
- Joslyn R.O.
- Katz I.
- Kindsvater Carl
- LaDue Wendell
- Larson Henning
- Latour M.
- Light Phillip
- Marshall J.S.
- Maynard H.W.
- Mitchell W.D.
- Morgan J.H.
- Perry J.I.
- Powell Ralph W.
- Powers T.J.
- Reed Paul W.
- Reiter D.D.
- Reynolds S.E.
- Rodebush W.H.
- Schiff W.J.
- Snider R.G.
- Spafford H.A.
- Spaulding Chas
- Stone M.L.
- Stout G.E.
- Straub Frederick G.
- Swingle D.M.
- Swingle Donald M.
- Talmage D.B.
- Uhlig Herbert
- Vanoni Vito A.
- Veatch N.T.
- von Praag Alex, Jr.
- Wexler R.
- White F.C.
- Wilkes John F.
- Williams E.L.
- Wisler C.O.
- Youngquist C.V.
- Publication venue
- Illinois State Water Survey
- Publication date
- Field of study
On the occasion of the dedication of the Water Resources Building. Includes bibliographical references
Controversies about the treatment of myasthenia gravis.
- Author
- A III, Jaretzki
- Alpert I.L.
- Arts W.F.
- Behan P.O.
- Behan P.O.
- Behan W.M.H.
- Bergstrom K.
- Bergstrom K.
- Bever C.
- Blalock A.
- Bolooki H.
- Brunner N.B.
- Brunner N.G.
- Buckingham J.M.
- Calvey T.N.
- Chan K.
- Cohan S.L.
- Cohn H.E.
- Dau P.C.
- Dau P.C.
- Drachman D.B.
- Emerik K.B.
- Engel A.G.
- Engel A.G.
- Engel W.K.
- Farnsworth A.
- Faulkner S.L.
- Fineberg H.V.
- Fischer K.C.
- Fletcher R.H.
- FM Jr, Howard
- Fonkalsrud E.W.
- Fraser K.
- Freydberg C.D.
- Fukuyama Y.
- G Von Reis
- Genkins G.
- Genkins G.
- Glaser G.H.
- Goldman A.J.
- Grob D.
- Grob D.
- Grob D.
- Gschnitzer F.
- H Le Brigand
- Hertel G.
- Hofmann W.W.
- Horowitz S.H.
- Howard F.M.
- Howard F.M.
- Hudson C.S.
- Jaretzki A.
- Jenkins R.B.
- JF Jr, Howard
- Johns T.R.
- Johns T.R.
- Joseph B.S.
- Keesey J.
- Keynes G.
- Kjaer M.
- Klingen G.
- Kornfeld P.
- Kornfeld P.
- L P Rowland
- Lava N.S.
- Leeuwin R.S.
- Leovey A.
- Levine G.D.
- Lindstrom J.M.
- Lisak R.P.
- Lisak R.P.
- ll Cohan SL
- Masaoka A.
- Masaoka A.
- Matell G.
- Mattila S.
- Mattila S.
- Mayer R.F.
- McQuillen M.P.
- McQuillen M.P.
- Merritt H.H.
- Mertens H.G.
- Middleton G.
- Millikan C.H.
- Mink J.H.
- Mount F.W.
- Mulder D.G.
- myasthenia Dunn J.M.Neonatal
- Namba T.
- Newsom-Davis J.
- Newsom-Davis J.
- Newsom-Davis J.
- Oosterhuis H.J.G.H.
- Osserman K.E.
- Osserman K.E.
- Pamboukis G.
- Papatestas A.E.
- Papatestas A.E.
- Papatestas A.E.
- Patten B.M.
- Patten B.M.
- Perlo V.P.
- Perlo V.P.
- Perlo V.P.
- Pinching A.J.
- Pinelli P.
- Pirofsky B.
- Reuther P.
- Rowland L.P.
- Rowland L.P.
- Rowland L.P.
- Rowland L.P.
- Rowland L.P.
- Ryniewicz B.
- Sambrook M.A.
- Sanders D.B.
- Sarnat H.B.
- Schlezinger N.S.
- Schwab R.S.
- Schwartz M.S.
- Seybold M.E.
- Seybold M.E.
- Simpson J.
- Simpson J.A.
- Simpson J.A.
- Simpson J.A.
- Smithers D.W.
- Strand F.L.
- Strauss A.J.L.
- Stump W.J.
- Swaiman K.F.
- Szobar A.
- Takahashi M.
- Torda C.
- Torda C.
- Twomey J.J.
- Vetters J.M.
- Vincent A.
- Ward M.D.
- Warmolts JR, Engel
- White M.C.
- Wilson R.W.
- Wolters E.C.M.J.
- Publication venue
- 'BMJ'
- Publication date
- Field of study