Laser-Induced Graphene (LIG) is regarded as a promising sensor carrier due to its inherent three-dimensional porous structure. However, as two mutually exclusive properties of the pressure sensor, sensitivity and work...Laser-Induced Graphene (LIG) is regarded as a promising sensor carrier due to its inherent three-dimensional porous structure. However, as two mutually exclusive properties of the pressure sensor, sensitivity and working range are difficult to be further improved by the single porous structure. Inspired by the unique geometry of Oxalis corniculata L. leaves, we here propose a novel method consist of laser pre-etching and inducing steps to fabricate LIG-based electrodes with a two-stage architecture featuring microjigsaw and microporous structures. The following injection of liquid-silicone significantly improves the friction resistance and bending reliability of LIG materials. The interface contact between external microjigsaw structures induces substantial resistance changes, and the internal microporous structure exhibits reversibility during dynamic deformation. Consequently, the jigsaw-like pressure sensor achieves a balanced performance with sensitivities of 3.64, 1.20 and 0.03 kPa^(- 1) in pressure range of 0 -20, 20 - 40 and 40 - 150 kPa, respectively. The bionic LIG-based pressure sensor serves as the core component and further integrated with an all-in-one wireless transmission system capable of monitoring various health parameters such as subtle pulse rates, heartbeat rhythms, sounds, etc., indicating broad prospects in future wearable electronics.展开更多
The study conducted a field survey of the invasive plant Oxalis corymbosa DC. in Kunming and an invasion risk assessment was carried out. The results showed that the invasion risk of Oxalis corymbosa DC. in four distr...The study conducted a field survey of the invasive plant Oxalis corymbosa DC. in Kunming and an invasion risk assessment was carried out. The results showed that the invasion risk of Oxalis corymbosa DC. in four districts of Kunming was 1.9 in Wuhua District, 2.05 in Panlong District, 0.6 in Xishan District, 1.45 in Guandu District and 0.6 in downtown area, among which Panlong District had the highest invasion risk. Schools(1.9) > Parks(1.45) > Residential communities(0.6). In addition, it was found in the survey that the Oxalis latifolia as a quarantine weed had a sporadic distribution in Yunnan University of Finance and Economics, so it is necessary to pay attention to prevention and control to avoid the harm caused by escape and spread.展开更多
The laser scribing of polyimide(PI, Kapton) film is a new, simple and effective method for graphene preparation. Moreover,the superhydrophobic surface modification can undoubtedly widen the application fields of graph...The laser scribing of polyimide(PI, Kapton) film is a new, simple and effective method for graphene preparation. Moreover,the superhydrophobic surface modification can undoubtedly widen the application fields of graphene. Herein, inspired by the hydrophobic and self-cleaning properties of natural Oxalis corniculata Linn. leaves, we propose a novel bionic manufacturing method for superhydrophobic laser-induced graphene(LIG). By tailoring the geometric parameters(size, roughness and height/area ratio) and chemical composition, the three-dimensional(3D) multistage LIG, i.e., with micro-jigsaw-like and porous structure, can deliver a static water contact angle(WCA) of 153.5° ± 0.6°, a water sliding angle(WSA) of 2.5° ±0.5°, and great superhydrophobic stability lasting for 100 days(WCAs ≈ 150°). This outstanding water repellency is achieved by the secondary structure of jigsaw-like LIG, a porous morphology that traps air layers at the solid–liquid interface. The robust self-cleaning and anti-stick functions of 3D bionic and multistage LIG are demonstrated to confirm its great potential in wearable electronics.展开更多
In the present study,we aimed to observe the effects of ethanol extract of Oxalis corniculata L.on bleeding time(BT)and coagulation time(CT)and determine its acute toxicity in mice.Firstly,the ethanol extract of O.cor...In the present study,we aimed to observe the effects of ethanol extract of Oxalis corniculata L.on bleeding time(BT)and coagulation time(CT)and determine its acute toxicity in mice.Firstly,the ethanol extract of O.corniculata was administered to 40 mice,which were randomly divided into the normal control group,Yunnan Baiyao control group,low-dose group,and high-dose group.The low-dose(0.6 g/kg)and high-dose(1.2 g/kg)groups received ethanol extract of O.corniculata by gavage,and the BT and CT of the mice were measured by the slide method and tail clipping method,respectively.Secondly,the median lethal dose method was used with 50 mice to observe the physiological state,poisoning reaction,and death of the mice after intragastric administration.Finally,on the 14th day of the experiment,a necropsy was performed to observe any abnormality of the organs.In conclusion,in the coagulation and hemostasis tests,there were no statistical differences between the groups(P>0.05),while there was a significant dose-response relationship,and the BT and CT were significantly shorter than those of the negative control group,which were comparable to the Yunnan Baiyao control group.Moreover,in the acute toxicity test,the median lethal dose of ethanol extract of O.corniculata was 6.0291 g/kg,with a 95%confidence interval of 5.3065–6.7829 mg/kg.展开更多
[Objectives]This study aimed to explore the protective effect of Oxalis coriniculata L.on rats with acute liver injury induced by carbon tetrachloride(CCl4)and related mechanism by regulating oxidative stress and the ...[Objectives]This study aimed to explore the protective effect of Oxalis coriniculata L.on rats with acute liver injury induced by carbon tetrachloride(CCl4)and related mechanism by regulating oxidative stress and the TLR-2 TLR-2/NF-κB signaling pathway.[Methods]A total of 48 female rats were randomly and evenly divided into normal group,model group,silymarin group(0.12 g/kg),and high(16 g/kg),middle(8 g/kg)and low-dose(4 g/kg)O.coriniculata L.groups.The rats in the groups were intragastrically administered with 5 mL/kg of corresponding drugs(equal-volume distilled water for normal group and control group),respectively.The administration was conducted twice a day,for 10 consecutive days.After 2 h of the last administration,the rats in all the groups except the normal group were intraperitoneally injected with 12%carbon tetrachloride(CCl4)olive oil solution(5 mL/kg),respectively to establish liver injury rat models.After 16 h,the eyeball blood of the rats was collected,and their liver tissues were collected for preparation of HE sections.The biochemical indicators detected included aspartate aminotransferase(AST),alanine aminotransferase(ALT),total superoxide dismutase(T-SOD)and glutathione peroxidase(GSH-Px)activity and malondialdehyde(MDA)content in the serum.The contents of tumor necrosis factor-α(TNF-α),interleukin-1β(IL-1β)and interleukin-6(IL-6)in the serum were detected by ELISA.The expression of Toll-like receptor-2(TLR-2)and nuclear factor-κB(NF-κB)in liver tissue was detected using Western blotting.The pathological changes of liver were observed under light microscope.[Results]Compared with the normal group,the ALT,AST activity and MDA,IL-1β,IL-6,TNF-αlevels in rat serum significantly increased(P<0.01),the GSH-Px,T-SOD activity in rat serum significantly decreased(P<0.01),and the expression of TLR-2 and NF-κB in liver tissue was up-regulated(P<0.01)in the model group.Compared with the model group,the ALT,AST activity and MDA,IL-1β,IL-6 and TNF-αlevels in rat serum reduced(P<0.05,P<0.01),the GSH-Px and T-SOD activity in rat serum increased(P<0.05,P<0.01),and the expression of TLR-2 and NF-κB in liver tissue was down-regulated(P<0.05,P<0.01)in the O.coriniculata L.administration groups.Pathological sections show that O.coriniculata L.had an improving effect on rats with acute liver injury induced by CCl4.[Conclusions]O.coriniculata L.has a good protective effect on rats with acute liver injury induced by CCl4.Its mechanism may be related to inhibition of oxidative stress,inhibition of inflammatory response and regulation of the TLR-2/NF-κB signaling pathway.展开更多
This study used Oxalis pes-caprae L.(OP)to develop a low-budget,low-maintenance,and environment-friendly production method for silver nanoparticles(AgNPs)and evaluated their antibacterial,antifungal,and antioxidant ab...This study used Oxalis pes-caprae L.(OP)to develop a low-budget,low-maintenance,and environment-friendly production method for silver nanoparticles(AgNPs)and evaluated their antibacterial,antifungal,and antioxidant abilities.Ultraviolet–visible(UV–Vis)spectroscopy results revealed a maximum of absorbance at 431 nm,confirming the formation of AgNPs.Moreover,Fourier transform infrared spectroscopy(FTIR)analysis of synthesized AgNPs indicated the presence of various important functional groups,such as O–H,CH,H–C–H,and C–O–C,which are involved in the synthesis and stability of the OP-AgNPs.X-ray diffraction(XRD)analysis confirmed the crystalline nature of the synthesized AgNPs,which had an average particle size of 46.31 nm and four Bragg reflections at 38.2°,44.32°,64.4°,and 77.1°.The Nanomeasurer software confirmed that 89%of the particles had an average size of 50 nm,and the scanning electron microscope analysis also confirmed spherical shaped,monodispersed,high-density AgNPs formation.Energy dispersive X-ray analysis confirmed that silver was the main element with a highest sharp peak at 3.0 keV.We assessed the antibacterial and antifungal activities of the AgNPs and OP extract on the bacteria strains Escherichia coli,Acetobacter,and Staphylococcus epidermidis,and fungi strains Aspergillus nigar and Aspergillus flavus.The AgNPs displayed more potent antibacterial and antifungal inhibition abilities than the plant.Similarly,in 1,1-diphenyl-2-picrylhydrazyl(DPPH),2,2-azobis,3-ethylbenzothiazoline-6-sulphonic acid(ABTS),and hydrogen peroxide(H_(2)O_(2))assays,AgNPs displayed better reduction capacities than the plant extract.展开更多
Mutations induced from tissue culture are easily to be separated,which might be propagated in the same medium,especially for the color-leaf ornamental grass,Oxalis triaggularis purpurea.Mutations of the ornamental tra...Mutations induced from tissue culture are easily to be separated,which might be propagated in the same medium,especially for the color-leaf ornamental grass,Oxalis triaggularis purpurea.Mutations of the ornamental traits in the tissue culture bottle could be investigated easily.The 35 d regeneration system group showed the lowest adventitious bud number and adventitious root number among 4 inoculation dates by 50 Gy dose of ^(60)Coγ radiation.More studies were carried out based on the 35d differentiation state of O.triangularis purpurea regeneration system.The 35 d regeneration system was then irradiated by 10,25 and 50 Gy doses of ^(60)Coγ rays.Numbers of adventitious buds and roots induced from the regeneration system were cut down with the increment of radiation doses.Seedling length was not distinctly reduced at the absorbed doses of 10 and 25 Gy,but reduced distinctly under 50 Gy of ^(60)Coγ irradiation.The optimal irradiation dose for 35 d O.triangularis regeneration system survival and mutation induction was approximately 25 Gy.The M_2 phenotypic mutation rate was 2.9%,especially,and the leaf number mutation accounted for 76%of the total mutation.The phenotypic mutations,especially in the 10 Gy group,on 0.1 m M Vc containing MS medium were recovered,which indicated that ROS plays a key role in the phenotypic mutation induced by ^(60)Coγ -rays.展开更多
基金supported by the Natural Science Foundation of Hunan Province,China(No.2024JJ6039).
文摘Laser-Induced Graphene (LIG) is regarded as a promising sensor carrier due to its inherent three-dimensional porous structure. However, as two mutually exclusive properties of the pressure sensor, sensitivity and working range are difficult to be further improved by the single porous structure. Inspired by the unique geometry of Oxalis corniculata L. leaves, we here propose a novel method consist of laser pre-etching and inducing steps to fabricate LIG-based electrodes with a two-stage architecture featuring microjigsaw and microporous structures. The following injection of liquid-silicone significantly improves the friction resistance and bending reliability of LIG materials. The interface contact between external microjigsaw structures induces substantial resistance changes, and the internal microporous structure exhibits reversibility during dynamic deformation. Consequently, the jigsaw-like pressure sensor achieves a balanced performance with sensitivities of 3.64, 1.20 and 0.03 kPa^(- 1) in pressure range of 0 -20, 20 - 40 and 40 - 150 kPa, respectively. The bionic LIG-based pressure sensor serves as the core component and further integrated with an all-in-one wireless transmission system capable of monitoring various health parameters such as subtle pulse rates, heartbeat rhythms, sounds, etc., indicating broad prospects in future wearable electronics.
基金Sponsored by Scientific Research Fund Project of Yunnan provincial Department of Education(2019J1096)
文摘The study conducted a field survey of the invasive plant Oxalis corymbosa DC. in Kunming and an invasion risk assessment was carried out. The results showed that the invasion risk of Oxalis corymbosa DC. in four districts of Kunming was 1.9 in Wuhua District, 2.05 in Panlong District, 0.6 in Xishan District, 1.45 in Guandu District and 0.6 in downtown area, among which Panlong District had the highest invasion risk. Schools(1.9) > Parks(1.45) > Residential communities(0.6). In addition, it was found in the survey that the Oxalis latifolia as a quarantine weed had a sporadic distribution in Yunnan University of Finance and Economics, so it is necessary to pay attention to prevention and control to avoid the harm caused by escape and spread.
基金supported by the Natural Science Foundation of Guangdong Province, China (No.2021B1515020087)the National Natural Science Foundation of China (No.51905178)。
文摘The laser scribing of polyimide(PI, Kapton) film is a new, simple and effective method for graphene preparation. Moreover,the superhydrophobic surface modification can undoubtedly widen the application fields of graphene. Herein, inspired by the hydrophobic and self-cleaning properties of natural Oxalis corniculata Linn. leaves, we propose a novel bionic manufacturing method for superhydrophobic laser-induced graphene(LIG). By tailoring the geometric parameters(size, roughness and height/area ratio) and chemical composition, the three-dimensional(3D) multistage LIG, i.e., with micro-jigsaw-like and porous structure, can deliver a static water contact angle(WCA) of 153.5° ± 0.6°, a water sliding angle(WSA) of 2.5° ±0.5°, and great superhydrophobic stability lasting for 100 days(WCAs ≈ 150°). This outstanding water repellency is achieved by the secondary structure of jigsaw-like LIG, a porous morphology that traps air layers at the solid–liquid interface. The robust self-cleaning and anti-stick functions of 3D bionic and multistage LIG are demonstrated to confirm its great potential in wearable electronics.
基金Yunnan Province Education Department Scientific Research Fund Project(Grant No.2022J1683)。
文摘In the present study,we aimed to observe the effects of ethanol extract of Oxalis corniculata L.on bleeding time(BT)and coagulation time(CT)and determine its acute toxicity in mice.Firstly,the ethanol extract of O.corniculata was administered to 40 mice,which were randomly divided into the normal control group,Yunnan Baiyao control group,low-dose group,and high-dose group.The low-dose(0.6 g/kg)and high-dose(1.2 g/kg)groups received ethanol extract of O.corniculata by gavage,and the BT and CT of the mice were measured by the slide method and tail clipping method,respectively.Secondly,the median lethal dose method was used with 50 mice to observe the physiological state,poisoning reaction,and death of the mice after intragastric administration.Finally,on the 14th day of the experiment,a necropsy was performed to observe any abnormality of the organs.In conclusion,in the coagulation and hemostasis tests,there were no statistical differences between the groups(P>0.05),while there was a significant dose-response relationship,and the BT and CT were significantly shorter than those of the negative control group,which were comparable to the Yunnan Baiyao control group.Moreover,in the acute toxicity test,the median lethal dose of ethanol extract of O.corniculata was 6.0291 g/kg,with a 95%confidence interval of 5.3065–6.7829 mg/kg.
基金Supported by Bagui Scholar Program of Guangxi(Gui Cai Jiao Han[2017]No.143).
文摘[Objectives]This study aimed to explore the protective effect of Oxalis coriniculata L.on rats with acute liver injury induced by carbon tetrachloride(CCl4)and related mechanism by regulating oxidative stress and the TLR-2 TLR-2/NF-κB signaling pathway.[Methods]A total of 48 female rats were randomly and evenly divided into normal group,model group,silymarin group(0.12 g/kg),and high(16 g/kg),middle(8 g/kg)and low-dose(4 g/kg)O.coriniculata L.groups.The rats in the groups were intragastrically administered with 5 mL/kg of corresponding drugs(equal-volume distilled water for normal group and control group),respectively.The administration was conducted twice a day,for 10 consecutive days.After 2 h of the last administration,the rats in all the groups except the normal group were intraperitoneally injected with 12%carbon tetrachloride(CCl4)olive oil solution(5 mL/kg),respectively to establish liver injury rat models.After 16 h,the eyeball blood of the rats was collected,and their liver tissues were collected for preparation of HE sections.The biochemical indicators detected included aspartate aminotransferase(AST),alanine aminotransferase(ALT),total superoxide dismutase(T-SOD)and glutathione peroxidase(GSH-Px)activity and malondialdehyde(MDA)content in the serum.The contents of tumor necrosis factor-α(TNF-α),interleukin-1β(IL-1β)and interleukin-6(IL-6)in the serum were detected by ELISA.The expression of Toll-like receptor-2(TLR-2)and nuclear factor-κB(NF-κB)in liver tissue was detected using Western blotting.The pathological changes of liver were observed under light microscope.[Results]Compared with the normal group,the ALT,AST activity and MDA,IL-1β,IL-6,TNF-αlevels in rat serum significantly increased(P<0.01),the GSH-Px,T-SOD activity in rat serum significantly decreased(P<0.01),and the expression of TLR-2 and NF-κB in liver tissue was up-regulated(P<0.01)in the model group.Compared with the model group,the ALT,AST activity and MDA,IL-1β,IL-6 and TNF-αlevels in rat serum reduced(P<0.05,P<0.01),the GSH-Px and T-SOD activity in rat serum increased(P<0.05,P<0.01),and the expression of TLR-2 and NF-κB in liver tissue was down-regulated(P<0.05,P<0.01)in the O.coriniculata L.administration groups.Pathological sections show that O.coriniculata L.had an improving effect on rats with acute liver injury induced by CCl4.[Conclusions]O.coriniculata L.has a good protective effect on rats with acute liver injury induced by CCl4.Its mechanism may be related to inhibition of oxidative stress,inhibition of inflammatory response and regulation of the TLR-2/NF-κB signaling pathway.
文摘This study used Oxalis pes-caprae L.(OP)to develop a low-budget,low-maintenance,and environment-friendly production method for silver nanoparticles(AgNPs)and evaluated their antibacterial,antifungal,and antioxidant abilities.Ultraviolet–visible(UV–Vis)spectroscopy results revealed a maximum of absorbance at 431 nm,confirming the formation of AgNPs.Moreover,Fourier transform infrared spectroscopy(FTIR)analysis of synthesized AgNPs indicated the presence of various important functional groups,such as O–H,CH,H–C–H,and C–O–C,which are involved in the synthesis and stability of the OP-AgNPs.X-ray diffraction(XRD)analysis confirmed the crystalline nature of the synthesized AgNPs,which had an average particle size of 46.31 nm and four Bragg reflections at 38.2°,44.32°,64.4°,and 77.1°.The Nanomeasurer software confirmed that 89%of the particles had an average size of 50 nm,and the scanning electron microscope analysis also confirmed spherical shaped,monodispersed,high-density AgNPs formation.Energy dispersive X-ray analysis confirmed that silver was the main element with a highest sharp peak at 3.0 keV.We assessed the antibacterial and antifungal activities of the AgNPs and OP extract on the bacteria strains Escherichia coli,Acetobacter,and Staphylococcus epidermidis,and fungi strains Aspergillus nigar and Aspergillus flavus.The AgNPs displayed more potent antibacterial and antifungal inhibition abilities than the plant.Similarly,in 1,1-diphenyl-2-picrylhydrazyl(DPPH),2,2-azobis,3-ethylbenzothiazoline-6-sulphonic acid(ABTS),and hydrogen peroxide(H_(2)O_(2))assays,AgNPs displayed better reduction capacities than the plant extract.
基金Supported by the National Natural Science Foundation of China(31600543)Anhui Provincial Natural Science Foundation(1708085MC57)the State Forestry Administration,China("948"Project:#2014-4-52)
文摘Mutations induced from tissue culture are easily to be separated,which might be propagated in the same medium,especially for the color-leaf ornamental grass,Oxalis triaggularis purpurea.Mutations of the ornamental traits in the tissue culture bottle could be investigated easily.The 35 d regeneration system group showed the lowest adventitious bud number and adventitious root number among 4 inoculation dates by 50 Gy dose of ^(60)Coγ radiation.More studies were carried out based on the 35d differentiation state of O.triangularis purpurea regeneration system.The 35 d regeneration system was then irradiated by 10,25 and 50 Gy doses of ^(60)Coγ rays.Numbers of adventitious buds and roots induced from the regeneration system were cut down with the increment of radiation doses.Seedling length was not distinctly reduced at the absorbed doses of 10 and 25 Gy,but reduced distinctly under 50 Gy of ^(60)Coγ irradiation.The optimal irradiation dose for 35 d O.triangularis regeneration system survival and mutation induction was approximately 25 Gy.The M_2 phenotypic mutation rate was 2.9%,especially,and the leaf number mutation accounted for 76%of the total mutation.The phenotypic mutations,especially in the 10 Gy group,on 0.1 m M Vc containing MS medium were recovered,which indicated that ROS plays a key role in the phenotypic mutation induced by ^(60)Coγ -rays.
