Article history: Received 21 April 2008 Available online 28 April 2010 JEL classification: C72

Article history: Received 23 December 2008 Available online 18 January 2009 JEL classification: C70

Article history: Accepted 19 February 2012 JEL classification: C72 D01 D43 L13

Article history: Received 4 October 2010 Available online 9 November 2010 JEL classification: C70 C72 C73

Article history: Received 7 May 2009 Available online 13 February 2010 JEL classification: C7 C9 D74

Article history: Received 5 February 2007 Available online 28 November 2008 JEL classification: C72

Many conditions associated with male infertility are inducers of oxidative stress, including varicocele. Antioxidants, such as coenzyme Q10, may be useful in this case. To evaluate the antioxidant capacity of seminal plasma of infertile men with varicocele before and after an oral supplementation with coenzyme Q10 , 38 patients were recruited from a pilot clinical trial. A standard semen analys...

Crop classification is a key issue for agricultural monitoring using remote-sensing techniques. Synthetic aperture radar (SAR) data are attractive for crop classification because of their all-weather, all-day imaging capability. The objective of this study is to investigate the capability of SAR data for crop classification in the North China Plain. Multi-temporal Envisat advanced synthetic ape...

ABSTRACT Accounting studies often examine whether the relation between X and Y varies with a moderating variable, M, by including an interactive term, × in regression. We provide plain-English guidance on why, how, when to use control variables, Z, interaction tests. A simulation simple descriptions demonstrate how interacted controls affect coefficient estimates interpretations. In particular,...

Article history: Received 7 March 2006 Available online 19 March 2009 JEL classification: D82 J33 M50