Helen Cheng

Amino acid residues in Anabaena ferredoxin crucial to interaction with ferredoxin-NADP+ reductase: Site-directed mutagenesis and laser flash photolysis

John K. Hurley, Zdzislaw Salamon, Terrance E. Meyer et al. · Biochemistry · 1993 · 101 citations

High Acceptability of a Vaginal Ring Intended as a Microbicide Delivery Method for HIV Prevention in African Women

Ariane van der Straten, Elizabeth Montgomery, Helen Cheng et al. · AIDS and Behavior · 2012 · 92 citations

Vaginal Ring Intended, Contraception, Sexual Health +7

Vaginal Ring Adherence in Sub-Saharan Africa: Expulsion, Removal, and Perfect Use

Elizabeth Montgomery, Ariane van der Straten, Helen Cheng et al. · AIDS and Behavior · 2012 · 81 citations

Vaginal Ring Adherence, Infertility, Sexual Health +12

Disclosure of pharmacokinetic drug results to understand nonadherence

Ariane van der Straten, Elizabeth Montgomery, Petina Musara et al. · AIDS · 2015 · 74 citations

Protein Expression, Selective Isotopic Labeling, and Analysis of Hyperfine-Shifted NMR Signals of Anabaena 7120 Vegetative [2Fe-2S]Ferredoxin

Helen Cheng, William M. Westler, Bin Xia et al. · Archives of Biochemistry and Biophysics · 1995 · 63 citations

Protein Expression, Biochemistry, Natural Sciences +6