Against the demand of intelligent greenhouse construction of facility agriculture,greenhouse environment monitoring system is developed.The system contains three-layer architecture: sensor network layer at the bottom,...Against the demand of intelligent greenhouse construction of facility agriculture,greenhouse environment monitoring system is developed.The system contains three-layer architecture: sensor network layer at the bottom,data transmission convergence layer in the middle and monitoring application layer on the top,which is different from design idea of the existing system architecture.The bottom layer uses ZigBee wireless communication technology to construct wireless sensor network,and node type contains coordinator,router and acquisition terminal.Acquisition terminal is distributed in each greenhouse to collect data and play the role of wireless transmission,and router plays the function of data forwarding as the bridge of acquisition terminal and coordinator.Middle layer is composed of monitoring software developed by Lab VIEW software of NI Company and coordinator,which is used to gather data from the bottom layer.The top layer is comprehensive monitoring platform developed by Java language,which is used to gather greenhouse data of all plantation bases in one region,thereby providing comprehensive information service for government,enterprise and farmer.Greenhouse environment monitoring system realizes data collection and sharing of greenhouse environment information(air temperature,air humidity,light intensity and carbon dioxide concentration).Via test verification,the system's operation is stable,with certain application value.展开更多
Periodontitis is an inflammatory disease caused by bacterial biofilms,which leads to the destruction of periodontal tissue.Current treatments,such as mechanical cleaning and antibiotics,struggle to effectively address...Periodontitis is an inflammatory disease caused by bacterial biofilms,which leads to the destruction of periodontal tissue.Current treatments,such as mechanical cleaning and antibiotics,struggle to effectively address the persistent biofilms,inflammation,and tissue damage.A new approach involves developing a Janus nanomotor(J-CeM@Au)by coating cerium dioxide-doped mesoporous silica(CeM)with gold nanoparticles(AuNPs).This nanomotor exhibits thermophoretic motion when exposed to near-infrared(NIR)laser light due to the temperature gradient produced by the photothermal effects of asymmetrically distributed AuNPs.The NIR laser provides the energy for propulsion and activates the nanomotor's antibacterial properties,allowing it to penetrate biofilms and kill bacteria.Additionally,the nanomotor's ability to scavenge reactive oxygen species(ROS)can modulate the immune response and create a regenerative environment,promoting the healing of periodontal tissue.Overall,this multifunctional nanomotor offers a promising new approach for treating periodontitis by simultaneously addressing biofilm management and immune modulation with autonomous movement.展开更多
The unreasonable application of nitrogen fertilizer poses a threat to agricultural productivity and the environment protection in Northeast China.Therefore,accurately assessing crop nitrogen requirements and optimizin...The unreasonable application of nitrogen fertilizer poses a threat to agricultural productivity and the environment protection in Northeast China.Therefore,accurately assessing crop nitrogen requirements and optimizing fertilization are crucial for sustainable agricultural production.A three-year field experiment was conducted to evaluate the effects of planting density on the critical nitrogen concentration dilution curve(CNDC)for spring maize under drip irrigation and fertilization integration,incorporating two planting densities:D1(60,000 plants ha^(-1))and D2(90,000 plants ha^(-1))and six nitrogen levels:no nitrogen(N0),90(N90),180(N180),270(N270),360(N360),and 450(N450)kg ha^(-1).A Bayesian hierarchical model was used to develop CNDC models based on dry matter(DM)and leaf area index(LAI).The results revealed that the critical nitrogen concentration exhibited a power function relationship with both DM and LAI,while planting density had no significant impact on the CNDC parameters.Based on these findings,we propose unified CNDC equations for maize under drip irrigation and fertilization integration:Nc=4.505DM-0.384(based on DM)and Nc=3.793LAI-0.327(based on LAI).Additionally,the nitrogen nutrition index(NNI),derived from the CNDC,increased with higher nitrogen application rates.The nitrogen nutrition index(NNI)approached 1 with a nitrogen application rate of 180 kg ha^(-1)under the D1 planting density,while it reached 1 at 270 kg ha^(-1)under the D2 planting density.The relationship between NNI and relative yield(RY)followed a“linear+plateau”model,with maximum RY observed when the NNI approached 1.Thus,under the condition of drip irrigation and fertilization integration in Northeast China’s spring maize production,the optimal nitrogen application rates for achieving the highest yields were 180 kg ha^(-1)at a planting density of 60,000 plants ha^(-1),and 270 kg ha^(-1)at a density of 90,000 plants ha^(-1).The CNDC and NNI models developed in this study are valuable tools for diagnosing nitrogen nutrition and guiding precise fertilization practices in maize production under integrated drip irrigation and fertilization systems in Northeast China.展开更多
As a global public health focus,oral health plays a vital role in facilitating overall health.Defected teeth characterized by exposure of dentin generally increase the risk of aggravating oral diseases.The exposed den...As a global public health focus,oral health plays a vital role in facilitating overall health.Defected teeth characterized by exposure of dentin generally increase the risk of aggravating oral diseases.The exposed dentinal tubules provide channels for irritants and bacterial invasion,leading to dentin hypersensitivity and even pulp inflammation.Cariogenic bacterial adhesion and biofilm formation on dentin are responsible for tooth demineralization and caries.It remains a clinical challenge to achieve the integration of tubule occlusion,collagen mineralization,and antibiofilm functions for managing exposed dentin.To address this issue,an epigallocatechin-3-gallate(EGCG)and poly(allylamine)-stabilized amorphous calcium phosphate(PAH-ACP)co-delivery hollow mesoporous silica(HMS)nanosystem(E/PA@HMS)was herein developed.The application of E/PA@HMS effectively occluded the dentinal tubules with acid-and abrasion-resistant stability and inhibited the biofilm formation of Streptococcus mutans.Intrafibrillar mineralization of collagen fibrils and remineralization of demineralized dentin were induced by E/PA@HMS.The odontogenic differentiation and mineralization of dental pulp cells with high biocompatibility were also promoted.Animal experiments showed that E/PA@HMS durably sealed the tubules and inhibited biofilm growth up to 14 days.Thus,the development of the E/PA@HMS nanosystem provides promising benefits for protecting exposed dentin through the coordinated manipulation of dentin caries and hypersensitivity.展开更多
The authors regret the incorrect publication of Fig.5,which was not identified during the proofing stage.During a self-check,we unfortunately found that the insets(250μg/mL,1 day)in Fig.5b/c and the image(1000μg/mL,...The authors regret the incorrect publication of Fig.5,which was not identified during the proofing stage.During a self-check,we unfortunately found that the insets(250μg/mL,1 day)in Fig.5b/c and the image(1000μg/mL,3 days)in Fig.5c were mistakenly used during figure assembly.We tracked down the original data obtained in June 2022,and have replaced Fig.5 with the correct image as follows.The authors would like to apologise for any inconvenience caused and state that the correction does not change the scientific conclusions of the article in any way.展开更多
基金Supported by Applied Technology Research and Development Fund Plan Item in Inner Mongolia(20140114)
文摘Against the demand of intelligent greenhouse construction of facility agriculture,greenhouse environment monitoring system is developed.The system contains three-layer architecture: sensor network layer at the bottom,data transmission convergence layer in the middle and monitoring application layer on the top,which is different from design idea of the existing system architecture.The bottom layer uses ZigBee wireless communication technology to construct wireless sensor network,and node type contains coordinator,router and acquisition terminal.Acquisition terminal is distributed in each greenhouse to collect data and play the role of wireless transmission,and router plays the function of data forwarding as the bridge of acquisition terminal and coordinator.Middle layer is composed of monitoring software developed by Lab VIEW software of NI Company and coordinator,which is used to gather data from the bottom layer.The top layer is comprehensive monitoring platform developed by Java language,which is used to gather greenhouse data of all plantation bases in one region,thereby providing comprehensive information service for government,enterprise and farmer.Greenhouse environment monitoring system realizes data collection and sharing of greenhouse environment information(air temperature,air humidity,light intensity and carbon dioxide concentration).Via test verification,the system's operation is stable,with certain application value.
基金Fundamental Research Funds for the Central Universities(2042022kf1206)National Natural Science Foundation of China(82271010).
文摘Periodontitis is an inflammatory disease caused by bacterial biofilms,which leads to the destruction of periodontal tissue.Current treatments,such as mechanical cleaning and antibiotics,struggle to effectively address the persistent biofilms,inflammation,and tissue damage.A new approach involves developing a Janus nanomotor(J-CeM@Au)by coating cerium dioxide-doped mesoporous silica(CeM)with gold nanoparticles(AuNPs).This nanomotor exhibits thermophoretic motion when exposed to near-infrared(NIR)laser light due to the temperature gradient produced by the photothermal effects of asymmetrically distributed AuNPs.The NIR laser provides the energy for propulsion and activates the nanomotor's antibacterial properties,allowing it to penetrate biofilms and kill bacteria.Additionally,the nanomotor's ability to scavenge reactive oxygen species(ROS)can modulate the immune response and create a regenerative environment,promoting the healing of periodontal tissue.Overall,this multifunctional nanomotor offers a promising new approach for treating periodontitis by simultaneously addressing biofilm management and immune modulation with autonomous movement.
基金supported by the grants from National Key Research and Development Program of China(2023YFD2303300)China Agriculture Research System(CARS-02-15)the Agricultural Science and Technology Innovation Program(CAAS-ZDRW202004).
文摘The unreasonable application of nitrogen fertilizer poses a threat to agricultural productivity and the environment protection in Northeast China.Therefore,accurately assessing crop nitrogen requirements and optimizing fertilization are crucial for sustainable agricultural production.A three-year field experiment was conducted to evaluate the effects of planting density on the critical nitrogen concentration dilution curve(CNDC)for spring maize under drip irrigation and fertilization integration,incorporating two planting densities:D1(60,000 plants ha^(-1))and D2(90,000 plants ha^(-1))and six nitrogen levels:no nitrogen(N0),90(N90),180(N180),270(N270),360(N360),and 450(N450)kg ha^(-1).A Bayesian hierarchical model was used to develop CNDC models based on dry matter(DM)and leaf area index(LAI).The results revealed that the critical nitrogen concentration exhibited a power function relationship with both DM and LAI,while planting density had no significant impact on the CNDC parameters.Based on these findings,we propose unified CNDC equations for maize under drip irrigation and fertilization integration:Nc=4.505DM-0.384(based on DM)and Nc=3.793LAI-0.327(based on LAI).Additionally,the nitrogen nutrition index(NNI),derived from the CNDC,increased with higher nitrogen application rates.The nitrogen nutrition index(NNI)approached 1 with a nitrogen application rate of 180 kg ha^(-1)under the D1 planting density,while it reached 1 at 270 kg ha^(-1)under the D2 planting density.The relationship between NNI and relative yield(RY)followed a“linear+plateau”model,with maximum RY observed when the NNI approached 1.Thus,under the condition of drip irrigation and fertilization integration in Northeast China’s spring maize production,the optimal nitrogen application rates for achieving the highest yields were 180 kg ha^(-1)at a planting density of 60,000 plants ha^(-1),and 270 kg ha^(-1)at a density of 90,000 plants ha^(-1).The CNDC and NNI models developed in this study are valuable tools for diagnosing nitrogen nutrition and guiding precise fertilization practices in maize production under integrated drip irrigation and fertilization systems in Northeast China.
基金This work was financially supported by National Natural Science Foundation of China(81901043,81970918,and 82001106)J.Yu’s research conducted at the UBC Faculty of Dentistry was supported by China Scholarship Council(202006275049).
文摘As a global public health focus,oral health plays a vital role in facilitating overall health.Defected teeth characterized by exposure of dentin generally increase the risk of aggravating oral diseases.The exposed dentinal tubules provide channels for irritants and bacterial invasion,leading to dentin hypersensitivity and even pulp inflammation.Cariogenic bacterial adhesion and biofilm formation on dentin are responsible for tooth demineralization and caries.It remains a clinical challenge to achieve the integration of tubule occlusion,collagen mineralization,and antibiofilm functions for managing exposed dentin.To address this issue,an epigallocatechin-3-gallate(EGCG)and poly(allylamine)-stabilized amorphous calcium phosphate(PAH-ACP)co-delivery hollow mesoporous silica(HMS)nanosystem(E/PA@HMS)was herein developed.The application of E/PA@HMS effectively occluded the dentinal tubules with acid-and abrasion-resistant stability and inhibited the biofilm formation of Streptococcus mutans.Intrafibrillar mineralization of collagen fibrils and remineralization of demineralized dentin were induced by E/PA@HMS.The odontogenic differentiation and mineralization of dental pulp cells with high biocompatibility were also promoted.Animal experiments showed that E/PA@HMS durably sealed the tubules and inhibited biofilm growth up to 14 days.Thus,the development of the E/PA@HMS nanosystem provides promising benefits for protecting exposed dentin through the coordinated manipulation of dentin caries and hypersensitivity.
文摘The authors regret the incorrect publication of Fig.5,which was not identified during the proofing stage.During a self-check,we unfortunately found that the insets(250μg/mL,1 day)in Fig.5b/c and the image(1000μg/mL,3 days)in Fig.5c were mistakenly used during figure assembly.We tracked down the original data obtained in June 2022,and have replaced Fig.5 with the correct image as follows.The authors would like to apologise for any inconvenience caused and state that the correction does not change the scientific conclusions of the article in any way.
