Suitable habitat is vital for the survival and restoration of a species.Understanding the suitable habitat range for lycophytes and ferns is prerequisite for effective species resource conservation and recovery effort...Suitable habitat is vital for the survival and restoration of a species.Understanding the suitable habitat range for lycophytes and ferns is prerequisite for effective species resource conservation and recovery efforts.In this study, we took Athyrium brevifrons as an example, predicted its suitable habitat using a Maxent model with 67 occurrence data and nine environmental variables in Northeast China.The area under the curve(AUC) value of independent test data, as well as the comparison with specimen county areal distribution of A.brevifrons exhibited excellent predictive performance.The type of environmental variables showed that precipitation contributed the most to the distribution prediction, followed by temperature and topography.Percentage contribution and permutation importance both indicated that precipitation of driest quarter(Bio17) was the key factor in determining the natural distribution of A.brevifrons, the reason could be proved by the fern gametophyte biology.The analysis of high habitat suitability areas also showed the habitat preference of A.brevifrons: comparatively more precipitation and less fluctuation in the driest quarter.Changbai Mountains, covering almost all the high and medium habitat suitability areas, provide the best ecological conditions for the survival of A.brevifrons, and should be considered as priority areas for protection and restoration of the wild resource.The potential habitat suitability distribution map could provide a reference for the sustainable development and utilisation of A.brevifrons resource, and Maxent modelling could be valuable for conservation management planning for lycophytes and ferns in Northeast China.展开更多
Resveratrol(Res)rapidly degrades and has hydrophobic properties with low bioavailability.Encapsulating in nanoparticles can stabilize its physicochemical properties.In this study,polysaccharides from Athyrium multiden...Resveratrol(Res)rapidly degrades and has hydrophobic properties with low bioavailability.Encapsulating in nanoparticles can stabilize its physicochemical properties.In this study,polysaccharides from Athyrium multidentatum(Doll.)Ching(AMC)were extracted and purified by AEC to obtain fractions AMCP-1 and AMCP-2,which were mainly composed of mannose,galactose and glucose.Res was encapsulated in nanoparticles prepared by zein(RZ)or AMCP-2 combined with zein(RZA).Particle size of RZA produced when Res addition was 3 mg and zein to AMCP-2 ratio was 1:3 was 189.66 nm,with a Polymer Dispersity Index(PDI)of 0.058 and a ζ-potential of21.23 mV.Infrared,Raman,and fluorescence spectroscopy studies revealed that hydrophobic forces,hydrogen bonding,and electrostatic interactions were main inermolecular force among zein,Res,and AMCP-2.Stability studies demonstrated that RZA exhibited improved thermal and ionic strength stability and storage stability.SEM results showed RZ had a spherical morphology and smooth surface,while RZA had a rough surface and uniform distribution.Scavenging activity against ABTS+of Res in RZA was significantly enhanced(p<0.05).The bioaccessibility of Res in RZA increased from 39.77%to 51.35%after gastrointestinal digestion.In summary,nanoparticles prepared by AMCP and zein have potential applications in hydrophobic substances loading.展开更多
基金Under the auspices of National Key Research and Development Program of China(No.2016YFC0500300)National Natural Science Foundation of China(No.41675153)
文摘Suitable habitat is vital for the survival and restoration of a species.Understanding the suitable habitat range for lycophytes and ferns is prerequisite for effective species resource conservation and recovery efforts.In this study, we took Athyrium brevifrons as an example, predicted its suitable habitat using a Maxent model with 67 occurrence data and nine environmental variables in Northeast China.The area under the curve(AUC) value of independent test data, as well as the comparison with specimen county areal distribution of A.brevifrons exhibited excellent predictive performance.The type of environmental variables showed that precipitation contributed the most to the distribution prediction, followed by temperature and topography.Percentage contribution and permutation importance both indicated that precipitation of driest quarter(Bio17) was the key factor in determining the natural distribution of A.brevifrons, the reason could be proved by the fern gametophyte biology.The analysis of high habitat suitability areas also showed the habitat preference of A.brevifrons: comparatively more precipitation and less fluctuation in the driest quarter.Changbai Mountains, covering almost all the high and medium habitat suitability areas, provide the best ecological conditions for the survival of A.brevifrons, and should be considered as priority areas for protection and restoration of the wild resource.The potential habitat suitability distribution map could provide a reference for the sustainable development and utilisation of A.brevifrons resource, and Maxent modelling could be valuable for conservation management planning for lycophytes and ferns in Northeast China.
基金supported by the National Natural Science Foundation of China(No.31701611)the Education Department of Jilin Province of China(JJKH20251107).
文摘Resveratrol(Res)rapidly degrades and has hydrophobic properties with low bioavailability.Encapsulating in nanoparticles can stabilize its physicochemical properties.In this study,polysaccharides from Athyrium multidentatum(Doll.)Ching(AMC)were extracted and purified by AEC to obtain fractions AMCP-1 and AMCP-2,which were mainly composed of mannose,galactose and glucose.Res was encapsulated in nanoparticles prepared by zein(RZ)or AMCP-2 combined with zein(RZA).Particle size of RZA produced when Res addition was 3 mg and zein to AMCP-2 ratio was 1:3 was 189.66 nm,with a Polymer Dispersity Index(PDI)of 0.058 and a ζ-potential of21.23 mV.Infrared,Raman,and fluorescence spectroscopy studies revealed that hydrophobic forces,hydrogen bonding,and electrostatic interactions were main inermolecular force among zein,Res,and AMCP-2.Stability studies demonstrated that RZA exhibited improved thermal and ionic strength stability and storage stability.SEM results showed RZ had a spherical morphology and smooth surface,while RZA had a rough surface and uniform distribution.Scavenging activity against ABTS+of Res in RZA was significantly enhanced(p<0.05).The bioaccessibility of Res in RZA increased from 39.77%to 51.35%after gastrointestinal digestion.In summary,nanoparticles prepared by AMCP and zein have potential applications in hydrophobic substances loading.
