In date palm Phoenix dactylifera L. male （pollen bearing） and female （fruit bearing） inflorescences are on separate palms. To ensure good fertilization and better yield, artificial pollination is carried out in da...In date palm Phoenix dactylifera L. male （pollen bearing） and female （fruit bearing） inflorescences are on separate palms. To ensure good fertilization and better yield, artificial pollination is carried out in date plantations, where pollen harvested from male flowers are used for artificial pollination which is usually done manually. Often, the availability of male flowers becomes scarce due to the high demand to take up pollination during the short period of time when the female flowers are receptive. We assessed the comparative efficiency of using pollen to manually pollinate female date palm flowers in the field using sponge pieces charged with harvested pollen as compared to the traditional practice of the farmers using male inflorescences. Results revealed that fruit set （%）, fructification （%）, yield per bunch （kg） besides fruit weight, length and breadth were statistically similar in the two pollination methods evaluated. The sponge method of manual pollination can therefore serve as a viable alternative to the traditional method of pollination with the possibility of using stored pollen especially where male palms are scarce and pollen is difficult to obtain.展开更多
An impedimetric sensor(EA/mAb/CeZnO/GCE)for detecting β-amyloid peptides(Aβ)was successfully constructed by synthesizing ceria doped zinc oxide(CeZnO)nanoparticles to modify the glassy carbon electrode(GCE)for immob...An impedimetric sensor(EA/mAb/CeZnO/GCE)for detecting β-amyloid peptides(Aβ)was successfully constructed by synthesizing ceria doped zinc oxide(CeZnO)nanoparticles to modify the glassy carbon electrode(GCE)for immobilizing the antibody mAb,and blocking the unbound carboxyl sites with ethanolamine(EA).The sensor exhibited a linear detection range of 10–100 pM and a detection limit of 1.7 pM(S/N=3),and the relative standard deviations(RSDs)of the inter-electrode and intra-electrodes were less than 3.0%.After it was stored at 4℃ for 2 d,its impedance value was 101.6% of original impedance response.The sensor was used to measure the remaining content of Aβ incubated in vitro.The results showed that after incubation for 48 h and 60 h,the content of aggregated Aβ(oligomers and fibers)almost unchanged,reaching about 90%.This method had the advantages of time-saving,simple procedure,economical,excellent conductivity,good reproducibility and stability.展开更多
文摘In date palm Phoenix dactylifera L. male （pollen bearing） and female （fruit bearing） inflorescences are on separate palms. To ensure good fertilization and better yield, artificial pollination is carried out in date plantations, where pollen harvested from male flowers are used for artificial pollination which is usually done manually. Often, the availability of male flowers becomes scarce due to the high demand to take up pollination during the short period of time when the female flowers are receptive. We assessed the comparative efficiency of using pollen to manually pollinate female date palm flowers in the field using sponge pieces charged with harvested pollen as compared to the traditional practice of the farmers using male inflorescences. Results revealed that fruit set （%）, fructification （%）, yield per bunch （kg） besides fruit weight, length and breadth were statistically similar in the two pollination methods evaluated. The sponge method of manual pollination can therefore serve as a viable alternative to the traditional method of pollination with the possibility of using stored pollen especially where male palms are scarce and pollen is difficult to obtain.
基金The National Youth Foundation of China(Grant No.81803487)National Natural Science Foundation of China(Grant No.81673392)Postdoctoral Science Foundation of China(Grant No.2018M631285).
文摘An impedimetric sensor(EA/mAb/CeZnO/GCE)for detecting β-amyloid peptides(Aβ)was successfully constructed by synthesizing ceria doped zinc oxide(CeZnO)nanoparticles to modify the glassy carbon electrode(GCE)for immobilizing the antibody mAb,and blocking the unbound carboxyl sites with ethanolamine(EA).The sensor exhibited a linear detection range of 10–100 pM and a detection limit of 1.7 pM(S/N=3),and the relative standard deviations(RSDs)of the inter-electrode and intra-electrodes were less than 3.0%.After it was stored at 4℃ for 2 d,its impedance value was 101.6% of original impedance response.The sensor was used to measure the remaining content of Aβ incubated in vitro.The results showed that after incubation for 48 h and 60 h,the content of aggregated Aβ(oligomers and fibers)almost unchanged,reaching about 90%.This method had the advantages of time-saving,simple procedure,economical,excellent conductivity,good reproducibility and stability.
