Erratum In situ localization and quantification of surfactins in a Bacillus subtilis swarming community by imaging mass spectrometry By D. The unit of concentration for surfactins should be mmol/L not pmol/mL throughout the text and on the y-axis of Fig. 8, which is reproduced below. The errors do not change the discussion or the conclusions in the original article in any way. Figure 8. Surfactin concentration determined at different locations in a swarm pattern. Average C 15 surfactin concentrations obtained from the samples described in Fig. 7. a: inside a den-drite, b: between two dendrites, c: outside a dendrite (right side) and d: outside a dendrite (left side).

Two novel α,β-unsaturated γ-lactono-hydrazides, geralcin A (2) and geralcin B (3), were isolated from Streptomyces sp. LMA-545. This unusual scaffold consists of the condensation of alkyl-hydrazide with an α,β-unsaturated γ-lactone, 3-(5-oxo-2H-furan-4-yl)propanoic acid (1), which was isolated from the same broth culture. Amberlite XAD-16 solid-phase extraction was used during the cultivation step, and the trapped compounds (1-3) were eluted from the resin with methanol. The structures were elucidated using (1)H, (13)C, and (15)N NMR spectroscopic analysis and high-resolution mass spectrometry. Geralcin B (3) was cytotoxic against MDA231 breast cancer cells with an IC(50) of 5 μM.

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ErratumIn situ localization and quantification of surfactins in a Bacillus subtilis swarming community by imaging mass spectrometry By D.