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1

Efficient estimation of the limit of detection and the relative limit of detection along with their reproducibility in the validation of qualitative microbiological methods by means of generalized linear mixed models

Uhlig, Steffen, Gowik, Petra

Journal:

Journal für Verbraucherschutz und Lebensmittelsicherheit

Year:

2017

Language:

english

File:

PDF, 500 KB

english, 2017

2

Multi-method for the determination of antibiotics of different substance groups in milk and validation in accordance with Commission Decision 2002/657/EC

D.A. Bohm, C.S. Stachel, P. Gowik

Journal:

Journal of Chromatography A

Year:

2009

Language:

english

File:

PDF, 611 KB

english, 2009

3

Can the usual validation standard series for quantitative methods, ISO 5725, be also applied for qualitative methods?

Steffen Uhlig, Ludwig Niewöhner, Petra Gowik

Journal:

Accreditation and Quality Assurance

Year:

2011

Language:

english

File:

PDF, 340 KB

english, 2011

4

Validation of a multi-residue method for the determination of several antibiotic groups in honey by LC-MS/MS

Bohm, Detlef A., Stachel, Carolin S., Gowik, Petra

Journal:

Analytical and Bioanalytical Chemistry

Year:

2012

Language:

english

File:

PDF, 761 KB

english, 2012

5

Taking laboratory uncertainties into account in the Hampel estimator

Uhlig, Steffen, Colson, Bertrand, Gowik, Petra

Journal:

Accreditation and Quality Assurance

Year:

2018

Language:

english

File:

PDF, 737 KB

english, 2018

6

A new profile likelihood confidence interval for the mean probability of detection in collaborative studies of binary test methods

Steffen Uhlig, Sven Krügener, Petra Gowik

Journal:

Accreditation and Quality Assurance

Year:

2013

Language:

english

File:

PDF, 317 KB

english, 2013

7

Efficient estimation of interlaboratory and in-house reproducibility standard deviation in factorial validation studies

Uhlig, Steffen, Gowik, Petra

Journal:

Journal für Verbraucherschutz und Lebensmittelsicherheit

Year:

2018

Language:

english

File:

PDF, 432 KB

english, 2018

8

Synthese, struktur, thermodynamik und reaktivitǎt von metallocenhexafluoropnikogenat-komplexen der 4. bis 7. gruppe

Petra Gowik, Thomas Klapötke

Journal:

Journal of Organometallic Chemistry

Year:

1990

Language:

english

File:

PDF, 2.15 MB

english, 1990

9

Metallocen-chemie hochfluorierter ligand-systeme XII. Synthese und charakterisierung von Cp2Ti(BiF6)2

Petra Gowik, Thomas Klapötke

Journal:

Journal of Organometallic Chemistry

Year:

1990

File:

PDF, 267 KB

1990

10

Matrix-comprehensive in-house validation and robustness check of a confirmatory method for the determination of four nitrofuran metabolites in poultry muscle and shrimp by LC–MS/MS

Claudia Bock, Petra Gowik, Carolin Stachel

Journal:

Journal of Chromatography B

Year:

2007

Language:

english

File:

PDF, 546 KB

english, 2007

11

Multi-residue method for non-steroidal anti-inflammatory drugs in plasma using high-performance liquid chromatography–photodiode-array detection: Method description and comprehensive in-house validation

Petra Gowik, Bernd Jülicher, Steffen Uhlig

Journal:

Journal of Chromatography B: Biomedical Sciences and Applications

Year:

1998

Language:

english

File:

PDF, 330 KB

english, 1998

12

Factorial interlaboratory tests for microbiological measurement methods

Steffen Uhlig, Petra Gowik

Journal:

Journal für Verbraucherschutz und Lebensmittelsicherheit

Year:

2010

Language:

english

File:

PDF, 1.73 MB

english, 2010

13

Development and in-house validation of an LC-MS/MS method for the determination of stilbenes and resorcylic acid lactones in bovine urine

Kathrin Schmidt, Carolin Stachel, Petra Gowik

Journal:

Analytical and Bioanalytical Chemistry

Year:

2008

Language:

english

File:

PDF, 249 KB

english, 2008

14

Predicting C4 Photosynthesis Evolution: Modular, Individually Adaptive Steps on a Mount Fuji Fitness Landscape

Heckmann, David, Schulze, Stefanie, Denton, Alisandra, Gowik, Udo, Westhoff, Peter, Weber, Andreas P.M., Lercher, Martin J.

Journal:

Year:

2013

Language:

english

File:

PDF, 689 KB

english, 2013

15

A top-down in-house validation based approach for the investigation of the measurement uncertainty using fractional factorial experiments

Jülicher, Bernd, Gowik, Petra, Uhlig, Steffen

Journal:

The Analyst (Royal Society of Chemistry)

Year:

1999

Language:

english

File:

PDF, 229 KB

english, 1999

16

Validation of qualitative PCR methods on the basis of mathematical–statistical modelling of the probability of detection

Uhlig, Steffen, Frost, Kirstin, Colson, Bertrand, Simon, Kirsten, Mäde, Dietrich, Reiting, Ralf, Gowik, Petra, Grohmann, Lutz

Journal:

Accreditation and Quality Assurance

Year:

2015

Language:

english

File:

PDF, 452 KB

english, 2015

17

Reliability of Precision Data Obtained from Interlaboratory Studies

Uhlig, Steffen, Eichler, Stefanie, Gowik, Petra

Journal:

Journal of AOAC International

Year:

2013

Language:

english

File:

PDF, 543 KB

english, 2013

18

RNA-Seq based phylogeny recapitulates previous phylogeny of the genus Flaveria (Asteraceae) with some modifications

Lyu, Ming-Ju Amy, Gowik, Udo, Kelly, Steve, Covshoff, Sarah, Mallmann, Julia, Westhoff, Peter, Hibberd, Julian M., Stata, Matt, Sage, Rowan F., Lu, Haorong, Wei, Xiaofeng, Wong, Gane Ka-Shu, Zhu, Xin-

Journal:

BMC Evolutionary Biology

Year:

2015

Language:

english

File:

PDF, 1.51 MB

english, 2015

19

The C 4 Ppc promoters of many C 4 grass species share a common regulatory mechanism for gene expression in the mesophyll cell

Gupta, Shipan Das, Levey, Myles, Schulze, Stefanie, Karki, Shanta, Emmerling, Jan, Streubel, Monika, Gowik, Udo, Paul Quick, W., Westhoff, Peter

Journal:

The Plant Journal

Year:

2019

Language:

english

File:

PDF, 1.68 MB

english, 2019

20

[FCNF]+[AsF6]−, ein Salz des linearen 22-Valenzelektronen-Kations [FCNF]+

Inis C. Tornieporth-Oetting, Dr. Petra Gowik, Priv.-Doz. Dr. Thomas M. Klapötke

Journal:

Angewandte Chemie

Year:

1991

Language:

german

File:

PDF, 370 KB

german, 1991

21

[FCNF]+[AsF6]−, a Salt of the Linear 22-Valence Electron Cation [FCNF]+

Dipl.-Chem. Inis C. Tornieporth-Oetting, Dr. Petra Gowik, Priv.-Doz. Dr. Thomas M. Klapötke

Journal:

Angewandte Chemie International Edition

Year:

1991

Language:

english

File:

PDF, 263 KB

english, 1991

22

Dikationen des Molybdänocen(VI)- und Wolframocen(VI)-dichlorids

Petra Gowik, Thomas Klapötke, Peter White

Journal:

European Journal of Inorganic Chemistry

Year:

1989

Language:

german

File:

PDF, 183 KB

german, 1989

23

Dichlorobis(η5-cyclopentadienyl)rhenium(VII)-tris(hexafluoroantimonat): Synthese des ersten Rhenocen(VII)-dichlorid-Kations

Petra Gowik, Thomas Klapötke, Inis Tornieporth-Oetting

Journal:

European Journal of Inorganic Chemistry

Year:

1989

File:

PDF, 158 KB

1989

24

Organo-Übergangsmetall-Chemie hochfluorierter Ligand-Systeme: X. Neue Organoniob(V)perfluoroborat-, -arsenat- und -antimonat-Komplexe

Petra Gowik, Thomas Klapötke

Journal:

Journal of Organometallic Chemistry

Year:

1989

Language:

german

File:

PDF, 701 KB

german, 1989

25

[Cp2Nb(CH3)2]+ [AsF6]− und [Cp2Mo(CH3)2]2+ [AsF6]2−, die ersten Niobocen- und Molybdänocendimethyl-Komplexe mit den Zentralmetallatomen in ihrer maximalen Oxidationsstufe

Petra Gowik, Thomas Klapötke

Journal:

Journal of Organometallic Chemistry

Year:

1989

Language:

german

File:

PDF, 189 KB

german, 1989

26

Organo-transition-metal chemistry of highly fluorinated ligand systems: IX. Chemical and biological aspects of novel organo-transition-metal hexafluoro-arsenates and -antimonates

Petra Gowik, Thomas Klapötke

Journal:

Journal of Organometallic Chemistry

Year:

1989

Language:

english

File:

PDF, 480 KB

english, 1989

27

Metallocen-chemie hochfluorierter ligand-systeme XI. Synthese und charakterisierung von Cp2Ti(SbF6)2 und Cp2Ti(Sb2F11)2; struktur von Cp2Ti(SbF6)2 und Cp2V(SbF6)2

Petra Gowik, Thomas Klapötke, Ulf Thewalt

Journal:

Journal of Organometallic Chemistry

Year:

1990

File:

PDF, 375 KB

1990

28

Bildung von μ-oxo-bis(η5-cyclopentadienyldichlorotitan(IV)) aus η5-cyclopentadienyl-tris(methylselenolato)titan(IV)

Petra Gowik, Thomas Klapötke, Joachim Pickardt

Journal:

Journal of Organometallic Chemistry

Year:

1990

File:

PDF, 369 KB

1990

29

Organo-Übergangsmetall-Chemie hochfluorierter Ligand-Systeme: XIII. Die Synthese und EPR-spektroskopische Charakterisierung von Cp2VCl(AsF6) und weiterer Vanadocen(IV)hexafluoropnikogenat-Spezies sowie die HF-katalysierte Oxidationsreaktion zu kationischen Vanadocenium(V)-Komplexen: Struktur von [Cp2VCl2]+[AsF6]−

Frank H. Görlitz, Petra K. Gowik, Thomas M. Klapötke, Deming Wang, Robert Meier, J. v. Welzen

Journal:

Journal of Organometallic Chemistry

Year:

1991

File:

PDF, 781 KB

1991

30

The Raman spectrum of tetraselenium tetranitride Se4N4

P.K. Gowik, T.M. Klapötke

Journal:

Spectrochimica Acta Part A: Molecular Spectroscopy

Year:

1990

Language:

german

File:

PDF, 218 KB

german, 1990

31

Treatment of turkeys with nitroimidazoles: Impact of the selection of target analytes and matrices on an effective residue control

J Polzer, C Stachel, P Gowik

Journal:

Analytica Chimica Acta

Year:

2004

Language:

english

File:

PDF, 275 KB

english, 2004

32

Nitroimidazoles in turkey muscle—the influence of sampling conditions on measurement results in residue control

J. Polzer, P. Gowik

Journal:

Analytica Chimica Acta

Year:

2005

Language:

english

File:

PDF, 174 KB

english, 2005

33

Validation of a confirmatory method for the determination of residues of four nitrofurans in egg by liquid chromatography–tandem mass spectrometry with the software InterVal

C. Bock, C. Stachel, P. Gowik

Journal:

Analytica Chimica Acta

Year:

2007

Language:

english

File:

PDF, 856 KB

english, 2007

34

In-house validation and factorial effect analysis of a liquid chromatography–tandem mass spectrometry method for the determination of steroids in bovine muscle

Kathrin S. Schmidt, Carolin S. Stachel, Petra Gowik

Journal:

Analytica Chimica Acta

Year:

2009

Language:

english

File:

PDF, 586 KB

english, 2009

35

Confirmatory method for the determination of streptomycin in apples by LC–MS/MS

Detlef A. Bohm, Carolin S. Stachel, P. Gowik

Journal:

Analytica Chimica Acta

Year:

2010

Language:

english

File:

PDF, 571 KB

english, 2010

36

Preparation and characterisation of in-house reference material of tylosin in honey and results of a proficiency test

Detlef A. Bohm, Carolin S. Stachel, Rudolf Hackenberg, Petra Gowik

Journal:

Analytica Chimica Acta

Year:

2011

Language:

english

File:

PDF, 417 KB

english, 2011

37

The validation of methods for regulatory purposes in the control of residues

Journal:

Journal of Chromatography A

Year:

2009

Language:

english

File:

PDF, 182 KB

english, 2009

38

Developing new reference materials for effective veterinary drug-residue testing in food-producing animals

Reinhard Zeleny, Franz Ulberth, Petra Gowik, Joachim Polzer, Leendert A. van Ginkel, Hendrik Emons

Journal:

TrAC Trends in Analytical Chemistry

Year:

2006

Language:

english

File:

PDF, 150 KB

english, 2006

39

Performance of a matrix-comprehensive in-house validation study by means of an especially designed software

S. Uhlig, P. Gowik, W. Radeck

Journal:

Analytica Chimica Acta

Year:

2003

Language:

english

File:

PDF, 1.27 MB

english, 2003

40

Zilpaterol—a new focus of concern in residue analysis

C.S Stachel, W Radeck, P Gowik

Journal:

Analytica Chimica Acta

Year:

2003

Language:

english

File:

PDF, 123 KB

english, 2003

41

Reactions of the novel [Cp2MoCl2]2+ cation with organothiolates to give molybdenocene (VI) dithiolates and the oxidation of Cp2Mo(SR)2 to give [Cp2Mo(SR)2]2+

Petra K. Gowik, Thomas M. Klapötke

Journal:

Inorganica Chimica Acta

Year:

1990

Language:

english

File:

PDF, 274 KB

english, 1990

42

Cp2NbCl2+X− (X = WF6 , AlCl4−): synthese, charakterisierung und reaktivität gegenüber AlCl3

P. Gowik, T. Klapötke

Journal:

Journal of Fluorine Chemistry

Year:

1990

File:

PDF, 32 KB

1990

43

Cp2NbCl2+X− (X = WF6−, AlCl4−): synthese, charakterisierung und reaktivität gegenüber AlCl3

P. Gowik, T. Klapötke

Journal:

Journal of Fluorine Chemistry

Year:

1990

File:

PDF, 433 KB

1990

44

Preparation and characterization of vanadocen (IV) hexafluoroarsenate complexes and the hf catalyzed oxidation to vanadocenium(V) species

P.K. Gowik, T.M. Klapötke

Journal:

Journal of Fluorine Chemistry

Year:

1991

Language:

english

File:

PDF, 40 KB

english, 1991

45

Synthesis and characterization of early transition metal complexes in their highest oxidation states

P.K. Gowik, T.M. Klapötke

Journal:

Journal of Fluorine Chemistry

Year:

1989

Language:

english

File:

PDF, 48 KB

english, 1989

46

The chemistry of highly oxidized metallocene hexafluropnicogenate complexes

P.K. Gowik, T.M. Klapötke

Journal:

Journal of Fluorine Chemistry

Year:

1989

Language:

english

File:

PDF, 43 KB

english, 1989

47

Synthesis and ring inversion of the first hafnocene ditellurolene chelate: [(η5-C5H5)2Hf(1,2-Te2C6H4)]

Th. Klapötke, H. Köpf, P. Gowik

Journal:

Year:

1987

Language:

english

File:

PDF, 159 KB

english, 1987

48

Validation of a method for the detection and confirmation of nitroimidazoles and corresponding hydroxy metabolites in turkey and swine muscle by means of gas chromatography–negative ion chemical ionization mass spectrometry

J Polzer, P Gowik

Journal:

Journal of Chromatography B: Biomedical Sciences and Applications

Year:

2001

Language:

english

File:

PDF, 1.79 MB

english, 2001

49

Warum wirken Organometallhexafluoropnikogenat-Komplexe biozid? Eine Studie zur Struktur-Wirkungs-Korrelation

Petra Gowik, Thomas Klapötke

Journal:

Monatshefte für Chemie - Chemical Monthly

Year:

1989

File:

PDF, 230 KB

1989

50

Das Europäische Netzwerk für die Rückstandskontrolle

Journal:

Journal für Verbraucherschutz und Lebensmittelsicherheit

Year:

2006

Language:

german

File:

PDF, 151 KB

german, 2006