Objective: To evaluate the effects of bisphenol A (BPA) on testosterone levels and sexual behaviors of male mice. Methods: Forty 12-week-old male mice, 22 - 25 g, were randomly allocated into four equal groups (n = 10...Objective: To evaluate the effects of bisphenol A (BPA) on testosterone levels and sexual behaviors of male mice. Methods: Forty 12-week-old male mice, 22 - 25 g, were randomly allocated into four equal groups (n = 10 per group): the control group and three BPA exposure groups including low concentration group (10 mg/kg), middle concentration group (50 mg/kg) and high concentration group (100 mg/kg). Each mouse received BPA intraperitoneally injected for 21 consecutive days. Sexual behaviors and testosterone levels in serum and interstitial tissue of testis were measured after the last administration of BPA. Furthermore, we also observed the weights of sexual organs of each group, including testis, epididymis and seminal vesicle. Results: The mount latency in the high concentration group, the intromission latency in the middle and the high concentration group were 11.64 ± 2.67 min, 20.28 ± 3.40 min and 20.13 ± 2.06 min respectively. All of them were longer than the control group (all P < 0.05). The mount frequency, intromission frequency and copulatory efficacy in the high concentration group were 0.52 ± 0.15 numbers/min, 0.37 ± 0.12 numbers/min and 0.40 ± 0.03, which were all statistically lower than the control group (all P < 0.05). The average testis weights in the low, middle and high concentration group were 0.198 ± 0.032 g, 0.203 ± 0.037g and 0.183 ± 0.032 g, and the relative testis weight in the high concentration group was 0.637 ± 0.106. All of these data were lower than the control group (P < 0.05, P < 0.05, P < 0.01 and P < 0.05, respectively). The epididymis weight and the relative epididymis weight, the weight of seminal vesicle and the relative weight of seminal vesicle were 0.069 ± 0.010 g, 0.242 ± 0.040, 0.219 ± 0.042 g and 0.760 ± 0.143, and all of them were lower than the control group (all P < 0.05). The serum testosterone levels in the high concentration group, the intratesticular testosterone levels in the middle and the high concentration group were 7.88 ± 1.62 ng/ml, 75.5 ± 7.18 ng/g and 73.00 ± 9.57 ng/g, which were all lower than the control group (all P < 0.05). Conclusions: BPA can decline the testosterone levels in mice and inhibit their sexual behaviors.展开更多
Arbuscular mycorrhizae(AM)fungi affect nutrient uptake for host plants,while it is unclear how AM fungi interacting with soil litter affect plant growth and nutrient utilization through mycorrhizal networks in karst s...Arbuscular mycorrhizae(AM)fungi affect nutrient uptake for host plants,while it is unclear how AM fungi interacting with soil litter affect plant growth and nutrient utilization through mycorrhizal networks in karst soil of deficient nutrients beyond the rhizosphere.An experiment was conducted in a microcosm composed of a planting compartment for Cinnamomum camphora seedlings with or without Glomus mosseae fungus(M+vs.M−)and an adjacent litter compartment containing or not containing additional litter material of Arthraxon hispidus(L+vs.L−),where the compartments are connected either by nylon mesh of 20μm or 0.45μm which either allow available mycorrhizal networks within the litter compartment or prevent mycelium entering into the litter compartment(N+vs.N−).Plant biomass and nutrients were measured.The results showed that the addition of litter changed the symbiotic process in mycorrhizal colonization,spore,and hyphal density,which when in association with the host plant then affected the biomass,and accumulations of N(nitrogen)and P(phosphorus)in the individual plant as well as root,stem,and leaf respectively.AM fungi increased N and P accumulations and N/P ratio in individual plants and plant tissues.A decrease of the N/P ratio of the individual plant was observed when AM fungus interacted significantly with litter through mycorrhizal networks in the litter compartment.The results indicate that the C.camphora seedlings benefited from litter in nutrient utilization of N and P through the vary of N/P ratio when accessing mycorrhizal networks.These findings suggest that mycorrhizal networks interacting with litter improve growth and nutrients of N and P for plants through the vary of N/P ratio in order to alleviate nutrient limitation under karst soil.展开更多
The problems faced by the development of Guangshan County were analyzed from the aspects of rural management talents,industrial structure,e-commerce development,and farmers'ideology,and corresponding solutions wer...The problems faced by the development of Guangshan County were analyzed from the aspects of rural management talents,industrial structure,e-commerce development,and farmers'ideology,and corresponding solutions were proposed to improve the development speed of rural areas in the county and promote the high-quality development of the county as a whole.展开更多
At present,rural e-commerce is characterized by obvious improvement in market prospect,development scale and development momentum,but there are also some problems,such as farmers’low acceptance of e-commerce,lack of ...At present,rural e-commerce is characterized by obvious improvement in market prospect,development scale and development momentum,but there are also some problems,such as farmers’low acceptance of e-commerce,lack of promotion and training of rural e-commerce,and lack of rural e-commerce talents.Based on these problems,the government needs to increase financial support for rural e-commerce,improve the distribution logistics system,and strengthen the training of rural e-commerce personnel to promote the sustainable development of rural e-commerce.展开更多
Covalent organic frameworks(COFs)are a class of porous crystalline polymers that have been widely investigated in various fields,including energy storage,photo/electrocatalysis,drug delivery.The covalent-bond intercon...Covalent organic frameworks(COFs)are a class of porous crystalline polymers that have been widely investigated in various fields,including energy storage,photo/electrocatalysis,drug delivery.The covalent-bond interconnection allows COFs extraordinary chemical and thermal stability,and the porous structure ensures a high ion-diffusion coefficient.These merits compensate for the drawbacks of organic electrodes that are easy to dissolve and have low charge conductivity,and promote the development of novel electrode materials with excellent performance,environmental friendliness,and low price.However,the application of COFs also encountered many problems,such as poor electronic conductivity due to the large band gap.Moreover,in some three-dimensional(3D)COFs and stacked two-dimensional(2D)COFs,the huge crystal structure,aligned ultralong channels,and numerous crystal defects usually impede ion transport,and the large molecular weights of COFs generally decrease the specific capacities.These issues are urgently needed to be solved.Here in this review,we summarize the latest progress,core challenges and coping strategies concerning with the use of COFs in alkali-metal ion batteries,discuss the impact of material structure on energy storage,and propose strategies for the construction of high-performance COF-based electrodes.展开更多
Background:Abnormal expression of long non-coding RNAs(lncRNAs)has been found in almost all tumors in humans,providing numerous potential diagnostic and prognostic biomarkers,and therapeutic targets.Materials and meth...Background:Abnormal expression of long non-coding RNAs(lncRNAs)has been found in almost all tumors in humans,providing numerous potential diagnostic and prognostic biomarkers,and therapeutic targets.Materials and methods:The Cancer Genome Atlas(TCGA)database was used to screen potential LncRNAs,and 30 paired hepatocellular carcinoma(HCC)tissues were used to investigate RP11-307C12.11 expression levels by qRT-PCR and another 105 HCC tissues by in situ hybridizsation(ISH).RP11-307C12.11 overexpression and knockdown experiments were performed to investigate the effects of RP11-307C12.11 on HCC growth through in vitro and in vivo assays(MTT assay,colony formation assay,EdU assay,and xenograft model).The molecular mechanism underlying these effects was confirmed by MS2-RIP-assay,RIP assay,luciferase assay,and rescue experiments.Results:RP11-307C12.11 expression level was significantly higher in tumor tissues than in the adjacent normal tissues.Elevated RP11-307C12.11 expression level was associated with poor prognosis of HCC patients,and it may be represented as an independent prognostic biomarker in patients with HCC.Functionally,RP11-307C12.11 overexpression promoted HCC growth both in vitro and in vivo;however,its knockdown reversed these effects.Mechanistically,we found that RP11-307C12.11 expressed predominantly in the cytoplasm and sponged microRNA(miR)-138 to regulate its common target CCND1 and PDK1.Conclusions:Thus,we found that RP11-307C12.11 acts as an oncogene in HCC by binding to miR-138,which might provide a novel target for HCC therapy.展开更多
The presence of excessive reactive oxygen species(ROS)after injuries to the enthesis could lead to cellular oxidative damage,high inflammatory response,chronic inflammation,and limited fibrochondral inductivity,making...The presence of excessive reactive oxygen species(ROS)after injuries to the enthesis could lead to cellular oxidative damage,high inflammatory response,chronic inflammation,and limited fibrochondral inductivity,making tissue repair and functional recovery difficult.Here,a multifunctional silk fibroin nanofiber modified with polydopamine and kartogenin was designed and fabricated to not only effectively reduce inflammation by scavenging ROS in the early stage of the enthesis healing but also enhance fibrocartilage formation with fibrochondrogenic induction in the later stages.The in vitro results confirmed the antioxidant capability and the fibrochondral inductivity of the functionalized nanofibers.In vivo studies showed that the multifunctional nanofiber can significantly improve the integration of tendon-bone and accelerate the regeneration of interface tissue,resulting in an excellent biomechanical property.Thus,the incorporation of antioxidant and bio-active molecules into extracellular matrix-like biomaterials in interface tissue engineering provides an integrative approach that facilitates damaged tissue regeneration and functional recovery,thereby improving the clinical outcome of the engineered tissue.展开更多
文摘Objective: To evaluate the effects of bisphenol A (BPA) on testosterone levels and sexual behaviors of male mice. Methods: Forty 12-week-old male mice, 22 - 25 g, were randomly allocated into four equal groups (n = 10 per group): the control group and three BPA exposure groups including low concentration group (10 mg/kg), middle concentration group (50 mg/kg) and high concentration group (100 mg/kg). Each mouse received BPA intraperitoneally injected for 21 consecutive days. Sexual behaviors and testosterone levels in serum and interstitial tissue of testis were measured after the last administration of BPA. Furthermore, we also observed the weights of sexual organs of each group, including testis, epididymis and seminal vesicle. Results: The mount latency in the high concentration group, the intromission latency in the middle and the high concentration group were 11.64 ± 2.67 min, 20.28 ± 3.40 min and 20.13 ± 2.06 min respectively. All of them were longer than the control group (all P < 0.05). The mount frequency, intromission frequency and copulatory efficacy in the high concentration group were 0.52 ± 0.15 numbers/min, 0.37 ± 0.12 numbers/min and 0.40 ± 0.03, which were all statistically lower than the control group (all P < 0.05). The average testis weights in the low, middle and high concentration group were 0.198 ± 0.032 g, 0.203 ± 0.037g and 0.183 ± 0.032 g, and the relative testis weight in the high concentration group was 0.637 ± 0.106. All of these data were lower than the control group (P < 0.05, P < 0.05, P < 0.01 and P < 0.05, respectively). The epididymis weight and the relative epididymis weight, the weight of seminal vesicle and the relative weight of seminal vesicle were 0.069 ± 0.010 g, 0.242 ± 0.040, 0.219 ± 0.042 g and 0.760 ± 0.143, and all of them were lower than the control group (all P < 0.05). The serum testosterone levels in the high concentration group, the intratesticular testosterone levels in the middle and the high concentration group were 7.88 ± 1.62 ng/ml, 75.5 ± 7.18 ng/g and 73.00 ± 9.57 ng/g, which were all lower than the control group (all P < 0.05). Conclusions: BPA can decline the testosterone levels in mice and inhibit their sexual behaviors.
基金This study was supported by the National Natural Science Foundation of China(NSFC:31660200,31660156,31360106,31700539)the First-class Disciplines Program on Ecology of Guizhou Province(GNYL[2017]007)+3 种基金the Guizhou High level(Hundred-level)Innovative Talents Project(Qian-ke-he platform talents[2020]6004)the Provincial Key Technologies R&D Program of Guizhou Province of China(NY[2014]3029,[2016]Zhi-cheng 2805)the Talent-platform Program of Guizhou Province([2017]5788,[2018]5781)the Doctor starts Fund Project of Guizhou University of Traditional Chinese Medicine([2020]15).
文摘Arbuscular mycorrhizae(AM)fungi affect nutrient uptake for host plants,while it is unclear how AM fungi interacting with soil litter affect plant growth and nutrient utilization through mycorrhizal networks in karst soil of deficient nutrients beyond the rhizosphere.An experiment was conducted in a microcosm composed of a planting compartment for Cinnamomum camphora seedlings with or without Glomus mosseae fungus(M+vs.M−)and an adjacent litter compartment containing or not containing additional litter material of Arthraxon hispidus(L+vs.L−),where the compartments are connected either by nylon mesh of 20μm or 0.45μm which either allow available mycorrhizal networks within the litter compartment or prevent mycelium entering into the litter compartment(N+vs.N−).Plant biomass and nutrients were measured.The results showed that the addition of litter changed the symbiotic process in mycorrhizal colonization,spore,and hyphal density,which when in association with the host plant then affected the biomass,and accumulations of N(nitrogen)and P(phosphorus)in the individual plant as well as root,stem,and leaf respectively.AM fungi increased N and P accumulations and N/P ratio in individual plants and plant tissues.A decrease of the N/P ratio of the individual plant was observed when AM fungus interacted significantly with litter through mycorrhizal networks in the litter compartment.The results indicate that the C.camphora seedlings benefited from litter in nutrient utilization of N and P through the vary of N/P ratio when accessing mycorrhizal networks.These findings suggest that mycorrhizal networks interacting with litter improve growth and nutrients of N and P for plants through the vary of N/P ratio in order to alleviate nutrient limitation under karst soil.
基金Supported by National Natural Science Foundation of China (31601235)CSC Scholarship (Overseas Training Program for Young Backbone Teachers in Colleges and Universities,No. 201806665009)+1 种基金Guangxi Natural Science Foundation (2017GXNSFBA198241)Bossco Innovative Talents Training Project for Young Teachers (BRP180251)
文摘The problems faced by the development of Guangshan County were analyzed from the aspects of rural management talents,industrial structure,e-commerce development,and farmers'ideology,and corresponding solutions were proposed to improve the development speed of rural areas in the county and promote the high-quality development of the county as a whole.
基金Supported by National Natural Science Foundation of China(31601235)CSC Scholarship(Overseas training program for young backbone teachers in Colleges and Universities,No.201806665009)+1 种基金Guangxi Natural Science Foundation(2017GXNSFBA198241)Bossco Innovative Talents Training Project for Young Teachers(BRP180251)。
文摘At present,rural e-commerce is characterized by obvious improvement in market prospect,development scale and development momentum,but there are also some problems,such as farmers’low acceptance of e-commerce,lack of promotion and training of rural e-commerce,and lack of rural e-commerce talents.Based on these problems,the government needs to increase financial support for rural e-commerce,improve the distribution logistics system,and strengthen the training of rural e-commerce personnel to promote the sustainable development of rural e-commerce.
基金This work was financially supported by the Natural Science Foundation of Jiangsu Province of China(BK20180086).
文摘Covalent organic frameworks(COFs)are a class of porous crystalline polymers that have been widely investigated in various fields,including energy storage,photo/electrocatalysis,drug delivery.The covalent-bond interconnection allows COFs extraordinary chemical and thermal stability,and the porous structure ensures a high ion-diffusion coefficient.These merits compensate for the drawbacks of organic electrodes that are easy to dissolve and have low charge conductivity,and promote the development of novel electrode materials with excellent performance,environmental friendliness,and low price.However,the application of COFs also encountered many problems,such as poor electronic conductivity due to the large band gap.Moreover,in some three-dimensional(3D)COFs and stacked two-dimensional(2D)COFs,the huge crystal structure,aligned ultralong channels,and numerous crystal defects usually impede ion transport,and the large molecular weights of COFs generally decrease the specific capacities.These issues are urgently needed to be solved.Here in this review,we summarize the latest progress,core challenges and coping strategies concerning with the use of COFs in alkali-metal ion batteries,discuss the impact of material structure on energy storage,and propose strategies for the construction of high-performance COF-based electrodes.
基金supported by:the National Natural Science Foundation of China(81702393,81770648,81670601,81570593)Key Scientific and Technological Projects of Guangdong Province(2015B020226004,2017A020215178)+4 种基金Guangdong Natural Science Foundation(2017A030310373,2015A030312013)Science and Technology Planning Project of Guangdong Province(2017B030314027,2017B020209004,2015B020226004)Science and Technology Planning Project of Guangzhou(2014Y2e00544)Guangzhou Science and Technology Huimin Special Project(2014Y2e00200)Sun Yat-sen University Young Teacher Training Project(17ykpy47).
文摘Background:Abnormal expression of long non-coding RNAs(lncRNAs)has been found in almost all tumors in humans,providing numerous potential diagnostic and prognostic biomarkers,and therapeutic targets.Materials and methods:The Cancer Genome Atlas(TCGA)database was used to screen potential LncRNAs,and 30 paired hepatocellular carcinoma(HCC)tissues were used to investigate RP11-307C12.11 expression levels by qRT-PCR and another 105 HCC tissues by in situ hybridizsation(ISH).RP11-307C12.11 overexpression and knockdown experiments were performed to investigate the effects of RP11-307C12.11 on HCC growth through in vitro and in vivo assays(MTT assay,colony formation assay,EdU assay,and xenograft model).The molecular mechanism underlying these effects was confirmed by MS2-RIP-assay,RIP assay,luciferase assay,and rescue experiments.Results:RP11-307C12.11 expression level was significantly higher in tumor tissues than in the adjacent normal tissues.Elevated RP11-307C12.11 expression level was associated with poor prognosis of HCC patients,and it may be represented as an independent prognostic biomarker in patients with HCC.Functionally,RP11-307C12.11 overexpression promoted HCC growth both in vitro and in vivo;however,its knockdown reversed these effects.Mechanistically,we found that RP11-307C12.11 expressed predominantly in the cytoplasm and sponged microRNA(miR)-138 to regulate its common target CCND1 and PDK1.Conclusions:Thus,we found that RP11-307C12.11 acts as an oncogene in HCC by binding to miR-138,which might provide a novel target for HCC therapy.
基金supported financially by the National Natural Science Foundation of China[No.11532004,11832008]Innovation and Attracting Talents Program for College and University(“111”Project)[No.B06023]。
文摘The presence of excessive reactive oxygen species(ROS)after injuries to the enthesis could lead to cellular oxidative damage,high inflammatory response,chronic inflammation,and limited fibrochondral inductivity,making tissue repair and functional recovery difficult.Here,a multifunctional silk fibroin nanofiber modified with polydopamine and kartogenin was designed and fabricated to not only effectively reduce inflammation by scavenging ROS in the early stage of the enthesis healing but also enhance fibrocartilage formation with fibrochondrogenic induction in the later stages.The in vitro results confirmed the antioxidant capability and the fibrochondral inductivity of the functionalized nanofibers.In vivo studies showed that the multifunctional nanofiber can significantly improve the integration of tendon-bone and accelerate the regeneration of interface tissue,resulting in an excellent biomechanical property.Thus,the incorporation of antioxidant and bio-active molecules into extracellular matrix-like biomaterials in interface tissue engineering provides an integrative approach that facilitates damaged tissue regeneration and functional recovery,thereby improving the clinical outcome of the engineered tissue.
基金supported by the National Natural Science Foundation of China(NSFC,31660156,31360106)the First-Class Disciplines Program on Ecology of Guizhou Province(GNYL[2017]007)+2 种基金the Guizhou Hundred-Level Innovative Talents Project(Qian-ke-he platform talents[2020]6004)the Science and Technology Project of Guizhou Province([2021]General-455,[2016]Supporting-2805)the Talent-platform Program of Guizhou Province([2017]5788,[2018]5781).