2,290 research outputs found
2-Chloro-Nâ˛-(2-chloroÂbenzylÂidene)benzohydrazide
The molÂecule of the title compound, C14H10Cl2N2O, adopts an E configuration about the C=N bond. The dihedral angle between the two benzene rings is 79.7â
(2)°. In the crystal structure, molÂecules are linked by interÂmolecular NâHâŻO, CâHâŻCl and CâHâŻO hydrogen bonds, forming chains running along the b axis
Bis[2-(1,3-benzothiaÂzol-2-ylsulfanÂyl)ethÂyl] ether
The complete molecule of title compound, C18H16N2OS4, is generated by crystallographic twofold symmetry, with the O atom lying on the rotation axis. The dihedral angle between the ring systems is 80.91â
(2)°. In the crystal, adjacent molÂecules are connected through ĎâĎ stacking interÂactions [centroidâcentroid distance = 3.882â
(2)â
Ă
], forming a three-dimensional network
Community of endophytic fungi from the medicinal and edible plant Fagopyrum tataricum and their antimicrobial activity
Purpose: To isolate and identify the fungal endophytes of Fagopyrum tataricum and assess their antimicrobial activity.Methods: The fungal isolates were identified according to their morphological characters and internal transcribed spacer (ITS) sequence analysis. Both broth-dilution-colorimetric assay and spore germination test were employed to assess the antimicrobial activity of fungal mycelia extracts.Results: A total of 72 endophytic fungal isolates were successfully obtained from the healthy tissues of F. tataricum. On the basis of their morphological and molecular characteristics, thirteen distinct fungal isolates were identified, and belonged to Alternaria, Bionectria, Botryosphaeria, Fusarium, Guignardia, Nectria, Neonectria, Phomopsis, Pseudocercospora and Verticillium spp. Of these, Pseudocercospora owned the maximum colonization frequency (15.3 %), next for Alternaria (12.5 %) and Neonectria (11.1 %). Through antimicrobial screening assays, six endophytes (Fataf-4, 6, 9, 11, 12 and 15) were active against Bacillus subtilis, Staphylococcus aureus, Agrobacterium tumefaciens, Escherichia coli and Pseudomonas lachrymans, and their minimal inhibitory concentration (MIC) ranged from 0.125 to 2.00 mg/mL. Furthermore, the endophytes, Fataf-9 and Fataf-11, also displayed strong inhibitory activity on the spore germination of F. oxysporum f. sp. vasinfectum and F. oxysporum f. sp. cucumerinum, and their median effective inhibitory concentration (IC50) was 0.356, 0.463, 0.451 and 0.489 mg/mL, respectively.Conclusion: The endophytic fungi of F. tataricum appear to be diverse and promising in their antimicrobial activity, and may represent a potential source of antibiotics for agriculture and/or pharmaceutical applications.Keywords: Endophytic fungi, Fagopyrum tataricum, Diversity, Antimicrobial activity, Antibiotics, Pseudocercospor
Application of Local Wave Decomposition in Seismic Signal Processing
Local wave decomposition (LWD) method plays an important role in seismic signal processing for its superiority in significantly revealing the frequency content of a seismic signal changes with time variation. The LWD method is an effective way to decompose a seismic signal into several individual components. Each component represents a harmonic signal localized in time, with slowly varying amplitudes and frequencies, potentially highlighting different geologic and stratigraphic information. Empirical mode decomposition (EMD), the synchrosqueezing transform (SST), and variational mode decomposition (VMD) are three typical LWD methods. We mainly study the application of the LWD method especially EMD, SST, and VMD in seismic signal processing including seismic signal deânoising, edge detection of seismic images, and recovery of the target reflection near coal seams
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