## 2 Results
\begin{table}
\begin{tabular}{c c c c} \hline \hline  & **(a)** & **Diverpiele Fragments** & \(n/z\) \\ \hline \hline CS-FA-Dab & & calc. & found \\ \hline \hline \multicolumn{2}{c}{} & 141.13 & 141.03 \\ \hline \multicolumn{2}{c}{} & 202.12 & 220.02 \\ \hline \multicolumn{2}{c}{} & The-Dab & 202.12 & 220.02 \\ \hline \multicolumn{2}{c}{} & Due-Thr & 202.12 & 220.02 \\ \hline \multicolumn{2}{c}{} & The-Dab & 202.12 & 220.02 \\ \hline \multicolumn{2}{c}{} & Dab-Leu & 214.16 & 214.06 \\ \hline \multicolumn{2}{c}{} & Low-Leu & 227.18 & 227.08 \\ \hline \multicolumn{2}{c}{} & Leu-Dab & 214.16 & 214.06 \\ \hline \multicolumn{2}{c}{} & Dab-Dab & 201.13 & 201.03 \\ \hline \multicolumn{2}{c}{} & Dab-Thr & 202.12 & 202.02 \\ \hline \multicolumn{2}{c}{} & \multicolumn{2}{c}{Thr + 145.41} & 247.47 & – \\ \hline \multicolumn{2}{c}{} & **(b)** & **Tipeptide Fragments** & \\ \hline \multicolumn{2}{c}{} & 342.24 & 342.18\({}^{*}\) \\ \hline \multicolumn{2}{c}{} & Dab-Thr-Dab & 302.18 & 302.14 \\ \hline \multicolumn{2}{c}{} & The-Dab-Thr-Dab & 303.17 & 285.11 \\ \hline \multicolumn{2}{c}{} & Dab-Thr-Dab & 302.18 & 302.14 \\ \hline \multicolumn{2}{c}{} & The-Dab-Leu & 303.15 & 302.07.17\({}^{*}\) \\ \hline \multicolumn{2}{c}{} & Dab-Leu-Leu & 327.24 & 327.21 \\ \hline \multicolumn{2}{c}{} & Leu-Leu-Dab & 327.24 & 327.21 \\ \hline \multicolumn{2}{c}{} & Leu-Lab-Dab & 314.22 & 314.18 \\ \multicolumn{2}{c}{} & Do-Dab-Thr & 302.17 & 302.14 \\ \hline \multicolumn{2}{c}{} & Dab-Thr + 145.41 & 347.43 & – \\ \hline \end{tabular}
\end{table} 
Table 3: Modelling of the structure of the polymygin E-derivative with a molecular mass of \(n/z=1316.2\) by combination of nearest neighbor relationships obtained by MALDI TOF MS. \begin{tabular}{c c c} \multicolumn{3}{c}{Table 3. Cont.} \\ \hline \multicolumn{3}{c}{(\(\alpha\)) **Tetapeptide fragments**} \\ \hline C-FA-Dab-Thr-Dab & & 442.30 & 442.20 \\ \hline Dab-Thr-Dab-Thr & & 403.23 & 403.23 \\ \hline Thr-Dab-Thr-Dab & & 403.23 & 403.23 \\ \hline Dab-Thr-Dab-Leu & & 415.27 & 415.25 \\ \hline The Dab-Leu-Leu & & 428.29 & 410.28\({}^{*}\) \\ \hline Dab-Leu-Leu-Dab & & 427.30 & 427.26 \\ \hline Leu-Dab-Dab-Thr & & 415.27 & 415.25 \\ \hline Dab-Dab-Thr + 145.41 & & 442.59 & 47.31 \\ \hline C-FA-Dab-Thr-Dab-Thr & & 543.38 & 507.28\({}^{*}\) \\ \hline Dab-Thr-Dab-Thr & & 503.35 & 503.25 \\ \hline The-Dab-Thr-Dab-Leu & & 516.31 & 498.25\({}^{*}\) \\ \hline Dab-Thr-Dab-Leu & & 528.35 & 528.35 \\ \hline Dab-Thr-Dab-Leu-Dab & & 528.35 & 528.35 \\ \hline Dab-Leu-Leu-Dab-Dab & & 527.37 & \(-\) \\ \hline Leu-Leu-Dab-Dab-Thr & & 528.35 & 528.35 \\ \hline \multicolumn{3}{c}{The Dab-Dab-Thr + 145.41} & 560.68 & \(-\) \\ \hline \end{tabular}   
The in position 4 is underlined. \({}^{*}\)means [M + H - HcO]. \({}^{*}\) means [M + H - 2 HcO]. Plant growth promoting rhizobacteria and endophytes, like _Bacilli_ and _Paenibacilli_, produce a wide spectrum of volatile organic compounds (VOCs), which exhibit a high chemical diversity and manifold activities. In this work we investigated the volatilomes of _Paenibacillus polynyuza_ DSM 32871 and M1, which were grown in four different cultivation media (NA, LB, TSA and Landy). The obtained results summarized in Table 4 show that the production of VOCs by such organisms is strain and medium dependent. The identification of microbial volatile organic compounds (mVOCs) was performed via HS-SPME GC-MS, compared to the NIST MS 14 database and confirmed via Kovats Index. In total, 25 different volatile compounds could be identified in the headspace of _P. polynyuza_ M1. In contrast to M1, only 20 volatile substances were detected as products of _P. polynyuza_ DSM 32871. Interestingly, M1 exhibited the broadest array of mVOCs when grown on NA, whereas DSM 32871 produced the highest number of volatiles cultivated in TSA. Both strains produced a mixture of ketones, alcohols, alkanes, alkenes, and a variety of alkylpyrazines. The volatilomes of _P. polynyuza_ DSM 32871 and M1 are highly overlapping with n-hexane being the sole compound, which could only be found in DSM 32871.