Aiming at improving the seed spacing uniformity of maize planter at high forward speed,a seed precise delivery mechanism driven by electric motor has been developed and evaluated in laboratory.The mechanism was design...Aiming at improving the seed spacing uniformity of maize planter at high forward speed,a seed precise delivery mechanism driven by electric motor has been developed and evaluated in laboratory.The mechanism was designed to deliver single seed from seed meter to furrow.Seed’s movement from the seed release point in a seed meter to the seed delivery cavity in the belt was analyzed,the mathematical model of seed movement in the seed precise delivery mechanism was established based on seed delivery time analysis.A mechanical prototype was designed and associated control system was developed.The performance contrast experiment was conducted between a traditional seed tube and newly developed seed precise delivery mechanism,and test results indicated that the qualities of feed index of the seed precise delivery mechanism were higher than those of the traditional seed tube delivery mechanism,and the coefficients of variation of the seed precise delivery mechanism were lower than those of the traditional seed tube delivery mechanism when the forward speed of planter was set at 10 km/h,12 km/h and 14 km/h,respectively.It indicated the seed precise delivery mechanism significantly improved seed spacing uniformity of maize planter compared with the traditional seed tube delivery mechanism.展开更多
Rheumatoid arthritis is a chronic,systemic autoimmune disease predominantly based on joint lesions with an extremely high disability and deformity rate.Several drugs have been used for the treatment of rheumatoid arth...Rheumatoid arthritis is a chronic,systemic autoimmune disease predominantly based on joint lesions with an extremely high disability and deformity rate.Several drugs have been used for the treatment of rheumatoid arthritis,but their use is limited by suboptimal bioavailability,serious adverse effects,and nonnegligible first-pass effects.In contrast,transdermal drug delivery systems(TDDSs)can avoid these drawbacks and improve patient compliance,making them a promising option for the treatment of rheumatoid arthritis(RA).Of course,TDDSs also face unique challenges,as the physiological barrier of the skin makes drug delivery somewhat limited.To overcome this barrier and maximize drug delivery efficiency,TDDSs have evolved in terms of the principle of transdermal facilitation and transdermal facilitation technology,and different generations of TDDSs have been derived,which have significantly improved transdermal efficiency and even achieved individualized controlled drug delivery.In this review,we summarize the different generations of transdermal drug delivery systems,the corresponding transdermal strategies,and their applications in the treatment of RA.展开更多
Oncolytic virus(OV)therapy has been shown to be an effective targeted cancer therapy treatment in recent years,providing an avenue of treatment that poses no damage to surrounding healthy tissues.Not only do OVs cause...Oncolytic virus(OV)therapy has been shown to be an effective targeted cancer therapy treatment in recent years,providing an avenue of treatment that poses no damage to surrounding healthy tissues.Not only do OVs cause direct oncolysis,but they also amplify both innate and adaptive immune responses generating long-term anti-tumour immunity.Genetically engineered OVs have become the common promising strategy to enhance anti-tumour immunity,safety,and efficacy as well as targeted delivery.The studies of various OVs have been accomplished through phase I-III clinical trial studies.In addition,the uses of carrier platforms of organic materials such as polymer chains,liposomes,hydrogels,and cell carriers have played a vital role in the potentially targeted delivery of OVs.The mechanism,rational design,recent clinical trials,applications,and the development of targeted delivery platforms of OVs will be discussed in this review.展开更多
基金The authors disclosed receipt of the following financial support for the research,authorship,and/or publication of this article:This work was funded by the National Natural Science Foundation of China(Grant No.51575515)the National key research and development program in 13th Five-Year(Grant No.2017YFD0700703)the Soil-Machine-Plant Key Laboratory of the Ministry of Agriculture of PR China and Project of the Modern National Industry System of Maize Industrial Technology(CARS-02).
文摘Aiming at improving the seed spacing uniformity of maize planter at high forward speed,a seed precise delivery mechanism driven by electric motor has been developed and evaluated in laboratory.The mechanism was designed to deliver single seed from seed meter to furrow.Seed’s movement from the seed release point in a seed meter to the seed delivery cavity in the belt was analyzed,the mathematical model of seed movement in the seed precise delivery mechanism was established based on seed delivery time analysis.A mechanical prototype was designed and associated control system was developed.The performance contrast experiment was conducted between a traditional seed tube and newly developed seed precise delivery mechanism,and test results indicated that the qualities of feed index of the seed precise delivery mechanism were higher than those of the traditional seed tube delivery mechanism,and the coefficients of variation of the seed precise delivery mechanism were lower than those of the traditional seed tube delivery mechanism when the forward speed of planter was set at 10 km/h,12 km/h and 14 km/h,respectively.It indicated the seed precise delivery mechanism significantly improved seed spacing uniformity of maize planter compared with the traditional seed tube delivery mechanism.
基金supported by the Scientific Research Project of Liaoning Province Education Department (2020LJC16),China。
文摘Rheumatoid arthritis is a chronic,systemic autoimmune disease predominantly based on joint lesions with an extremely high disability and deformity rate.Several drugs have been used for the treatment of rheumatoid arthritis,but their use is limited by suboptimal bioavailability,serious adverse effects,and nonnegligible first-pass effects.In contrast,transdermal drug delivery systems(TDDSs)can avoid these drawbacks and improve patient compliance,making them a promising option for the treatment of rheumatoid arthritis(RA).Of course,TDDSs also face unique challenges,as the physiological barrier of the skin makes drug delivery somewhat limited.To overcome this barrier and maximize drug delivery efficiency,TDDSs have evolved in terms of the principle of transdermal facilitation and transdermal facilitation technology,and different generations of TDDSs have been derived,which have significantly improved transdermal efficiency and even achieved individualized controlled drug delivery.In this review,we summarize the different generations of transdermal drug delivery systems,the corresponding transdermal strategies,and their applications in the treatment of RA.
基金The work was financial supported by the National Science Foundation and South Carolina Experimental Program to Stimulate Competitive Research and Institutional Development Awards(SC EPSCoR IDeA)program under NSF Award.
文摘Oncolytic virus(OV)therapy has been shown to be an effective targeted cancer therapy treatment in recent years,providing an avenue of treatment that poses no damage to surrounding healthy tissues.Not only do OVs cause direct oncolysis,but they also amplify both innate and adaptive immune responses generating long-term anti-tumour immunity.Genetically engineered OVs have become the common promising strategy to enhance anti-tumour immunity,safety,and efficacy as well as targeted delivery.The studies of various OVs have been accomplished through phase I-III clinical trial studies.In addition,the uses of carrier platforms of organic materials such as polymer chains,liposomes,hydrogels,and cell carriers have played a vital role in the potentially targeted delivery of OVs.The mechanism,rational design,recent clinical trials,applications,and the development of targeted delivery platforms of OVs will be discussed in this review.
