Environmental & load data: 1:15 Scale tidal turbine subject to a variety of regular wave conditions.

Experimental data was obtained in order to investigate the effect of waves on the loads and performance of tidal turbines. An instrumented 1:15 scale tidal turbine was installed in the FloWave Ocean Energy Research Facility, and a wide range of regular wave conditions were generated; systematically varying both wave frequency and height. Waves were generated both following and opposing a fixed mean current velocity of 0.81 m/s. Data are made available of the measured turbine loads and environmental conditions obtained for five repeats of 24 wave conditions via https://doi.org/10.7488/ds/2472. A description of the data collection process, data processing, file structure and naming conventions are provided in this article. The analysis and presentation of the described dataset can be found in Ref. [1].

Structure-reactivity studies of the Cu(2+)-catalyzed decomposition of four S-nitrosothiols based around the S-Nitrosocysteine/S-nitrosoglutathione structures.

S-Nitrosoglutathione (GSNO) and the dipeptide derivative S-nitrosoglutamylcysteine (SNO-GluCys) both at 1 x 10(-3) M in pH 7. 4 buffer containing added Cu(2+) (1 x 10(-5) M) are very unreactive toward decomposition (measured spectrophotometrically), and in both cases reaction stops at very low conversion. S-Nitrosocysteine (SNC) and the dipeptide derivative S-nitrosocysteinylglycine (SNO-CysGly), on the other hand, are orders of magnitude more reactive under the same conditions, and reaction proceeds to completion. Initially, we interpreted these results in terms of the requirement of a suitably positioned free NH(2) group (which is available in both SNC and SNO-CysGly, but not in GSNO and SNO-GluCys) for efficient complexation of Cu(+), the effective reagent. However, later results measured at much lower substrate concentration (1 x 10(-6) M) using the NO electrode system showed that at this concentration, all four S-nitrosothiols react at approximately the same rate and yield NO quantitatively. For GSNO the rate and percentage conversion were shown to drop progressively as the substrate concentration increases. All reactions are effectively halted in the presence of the metal ion chelator EDTA. The results can readily be explained in terms of complexation of Cu(2+) by the product disulfides from GSNO (i.e., GSSG) and SNO-GluCys, involving the glutamate residue, which is not present in SNC and SNO-CysGly. This is confirmed by the observed progressive reduction in yield and percentage conversion of GSNO decomposition as GSSG is added, at micromolar substrate concentrations.