This paper reviewed advances in researches on genetic diversity of Lepidoptera insects from chromosome polymorphism,protein polymorphism,and DNA polymorphism,and stated that DNA sequence variation will become main poi...This paper reviewed advances in researches on genetic diversity of Lepidoptera insects from chromosome polymorphism,protein polymorphism,and DNA polymorphism,and stated that DNA sequence variation will become main points of researches about genetic diversity.展开更多
HMA2(heavy metal ATPase 2)plays a crucial role in extracellular and intracellular Zn^(2+)transport across biomembranes,maintaining ion homeostasis,and playing an important role in the normal physiological metabolism,g...HMA2(heavy metal ATPase 2)plays a crucial role in extracellular and intracellular Zn^(2+)transport across biomembranes,maintaining ion homeostasis,and playing an important role in the normal physiological metabolism,growth,and development of plants.In our study,a novel HMA2 gene,named MaHMA2,was isolated and cloned from white mulberry(Morus alba L.).The gene sequence obtained was 1,342 bp long,with an open reading frame of 1,194 bp,encoding a protein of 397 amino acids,with a predicted molecular mass of 42.852 kD and an isoelectric point of 7.53.This protein belonged to the PIB-type ATPase transport protein family.We analyzed the expression of the MaHMA2 gene by quantitative real-time PCR.The results showed that the level of MaHMA2 gene expression decreased to a Zn concentration of 800 mg/kg.Malondialdehyde and proline levels increased and responded to increasing Zn when the MaHMA2 gene was silenced,whereas the activities of peroxidase and superoxide dismutase tended to increase in response to increasing Zn^(2+)ion stress concentrations but were lower in the gene-silenced plants.These findings suggested that the MaHMA2 gene played an active role in the tolerance response of mulberry to Zn stress.展开更多
Background:The reproductive health addresses the reproductive processes,functions and system at all stages of life.Enhancing the level of global reproductive health is the goal of sustained attention and struggle by t...Background:The reproductive health addresses the reproductive processes,functions and system at all stages of life.Enhancing the level of global reproductive health is the goal of sustained attention and struggle by the international community.The social and economic development in Southeast Asia is lagging behind,and its female reproductive health is worrying,while the differences of female reproductive health among different regions are significant.Objective:To obtains the necessity and urgency of strengthening the reproductive health level of Southeast Asian countries,so as to provide the basis for the priorities and target to policy-makers and health administrators to improve reproductive health.Methods:Literature review were searched in PubMed,Web of Science databases,Google scholar database,and WHO's webpages.Maternal mortality ratio,contraceptive rates,unmet need for family planning,antenatal and postnatal care coverage,and sexually transmitted disease were the five key indicators and the influence factors for female reproductive health status in Southeast Asian countries.Results:The reproductive health of Southeast Asian women were still at a lower level overall and varied in different regions and conntries.Women's education and attitude,accessibility of service,socioeconomic and cultural factors,etc.were the potential influencing factors.Conclusion:There is left quite large space for improvement to the reproductive health in Southeast Asian countries and efficient interventions can be achieved for the key and easier-improved risk factors such as education and in high-risk areas.展开更多
Post-heat treatment is generally adopted in the additive manufacturing field due to its alleviation of high residual stress and modification of rapid-solidified multilevel heterogeneous microstructure,and the related ...Post-heat treatment is generally adopted in the additive manufacturing field due to its alleviation of high residual stress and modification of rapid-solidified multilevel heterogeneous microstructure,and the related performance of the heat-treated counterparts calls for a systemic investigation to build a criterion of the heat treatment procedure.In this work,we focus on the heat treatment effects on the recrystallization of the Hastelloy X alloy produced by the laser powder bed fusion(LPBF)method,and the related surface passivation of the heat-treated counterparts is meticulously assessed as well.Results show that the multilevel heterostructure for LPBF Hastelloy X alloy consists of sub-micro dislocation cell substructures with Cr/Mo elemental segregation,fine columnar grains,and periodically-distributed molten pools.After heat treatment,partially and fully recrystallized structures for LPBF Hastelloy X alloys were achieved at 1100 and 1200℃for 1 h,respectively.Furthermore,the as-built LPBF Hastelloy X alloy shows superior corrosion resistance while the heat-treated one(1100℃)exhibits the worst in the borate buffer solution.The growth of passive film exhibited a highly linear correlation with the nucleation process controlled by diffusion,and high dislocation density and low angle grain boundary decreased the diffusion coefficient of cation vacancies,augmenting the nucleation sites of the passive film and enhancing its growth rate.Moreover,the micro-galvanic effect resulting from the partially recrystallized microstructure actively facilitated the formation of inhomogeneous porous passive films,leading to the worst corrosion resistance.展开更多
Laser powder bed fusion (LPBF) is a commonly used additive manufacturing (AM) method for efficiently producing intricate geometric components. This investigation examines factors such as pores, cellular structure, gra...Laser powder bed fusion (LPBF) is a commonly used additive manufacturing (AM) method for efficiently producing intricate geometric components. This investigation examines factors such as pores, cellular structure, grain size, and inclusions from the manufacturing process that contribute to the corrosion resistance of LPBF DSS. Furthermore, the as-built LPBF duplex stainless steel (DSS) is primarily ferrite due to the rapid cooling process. Therefore, the transformation of ferrite to austenite after various heat treatments in LPBF DSS and its corresponding corrosion resistance are presented. Additionally, a new mixed powder method is proposed to increase the austenite content in the as-built LPBF DSS. This review also focuses on the passivation capability and pitting corrosion performance in LPBF and conventional DSS. This article summarizes the variations in microstructure between as-built and heat-treated LPBF DSS, with their impacts on corrosion resistance, offering insights for manufacturing highly corrosion-resistant LPBF DSS.展开更多
Objective:To investigate the risk factors of severe postpartum hemorrhage(PPH)in cesarean section of twin pregnancy,and to provide clinical basis for pregnancy management and perioperative obstetric management of twin...Objective:To investigate the risk factors of severe postpartum hemorrhage(PPH)in cesarean section of twin pregnancy,and to provide clinical basis for pregnancy management and perioperative obstetric management of twin pregnancy.Methods:The clinical data of 631 twin pregnancies with gestational age28 weeks delivered by cesarean section at Peking University People's Hospital(PKUPH)from January 2004 to January 2017 were retrospectively analyzed.Methods of conception,the combined weight of twins,serum albumin level before cesarean section,operation time and other factors on the amount of blood loss during cesarean section were analyzed.Results:The proportion of severe PPH was significantly higher in in vitro fertilization-embryo transfer(IVF-ET)group,the combined weight of twins>6000g group,serum albumin before cesarean section<30 g/dl group than in the natural pregnancy group,4000–6000g group,<4000g group and serum albumin30 g/dl group respectively(P<0.05).The proportion of severe PPH in the elective surgery group of twin pregnancy was higher than that in the emergency surgery group,but the difference was not statistically significant(P>0.05).Moreover,according to the surgical indications,the emergency surgery group was divided into premature rupture of membranes(PROM),labor,fetal distress and others groups,no significant difference were detected among these groups(P>0.05).Conclusion:IVF-ET,the combined weight of twins,serum albumin before operation were significantly correlated with severe PPH of twin pregnancies delivered by cesarean section,revealing that it is necessary to strengthen pregnancy management of twin pregnancy.展开更多
基金Supported by Special Fund Project for Talent Development of Anhui Academy of Agricultural Sciences(17F0610)Discipline Construction Project of Anhui Academy of Agricultural Sciences(16A0618)Project of Hefei Comprehensive Experiment Station of China Sericulture Industry Technology System(CARS-22-SYZ09)
文摘This paper reviewed advances in researches on genetic diversity of Lepidoptera insects from chromosome polymorphism,protein polymorphism,and DNA polymorphism,and stated that DNA sequence variation will become main points of researches about genetic diversity.
基金This work was supported by the China Agriculture Research System of MOF and MARA,National Key R&D Program of China,the key projects of International Scientific and Technological Innovation Cooperation(Grant No.2021YFE0111100)the Guangxi Innovation-Driven Development Project(Grant No.AA19182012-2)the Zhenjiang Science and Technology Support Project(Grant No.GJ2021015).
文摘HMA2(heavy metal ATPase 2)plays a crucial role in extracellular and intracellular Zn^(2+)transport across biomembranes,maintaining ion homeostasis,and playing an important role in the normal physiological metabolism,growth,and development of plants.In our study,a novel HMA2 gene,named MaHMA2,was isolated and cloned from white mulberry(Morus alba L.).The gene sequence obtained was 1,342 bp long,with an open reading frame of 1,194 bp,encoding a protein of 397 amino acids,with a predicted molecular mass of 42.852 kD and an isoelectric point of 7.53.This protein belonged to the PIB-type ATPase transport protein family.We analyzed the expression of the MaHMA2 gene by quantitative real-time PCR.The results showed that the level of MaHMA2 gene expression decreased to a Zn concentration of 800 mg/kg.Malondialdehyde and proline levels increased and responded to increasing Zn when the MaHMA2 gene was silenced,whereas the activities of peroxidase and superoxide dismutase tended to increase in response to increasing Zn^(2+)ion stress concentrations but were lower in the gene-silenced plants.These findings suggested that the MaHMA2 gene played an active role in the tolerance response of mulberry to Zn stress.
文摘Background:The reproductive health addresses the reproductive processes,functions and system at all stages of life.Enhancing the level of global reproductive health is the goal of sustained attention and struggle by the international community.The social and economic development in Southeast Asia is lagging behind,and its female reproductive health is worrying,while the differences of female reproductive health among different regions are significant.Objective:To obtains the necessity and urgency of strengthening the reproductive health level of Southeast Asian countries,so as to provide the basis for the priorities and target to policy-makers and health administrators to improve reproductive health.Methods:Literature review were searched in PubMed,Web of Science databases,Google scholar database,and WHO's webpages.Maternal mortality ratio,contraceptive rates,unmet need for family planning,antenatal and postnatal care coverage,and sexually transmitted disease were the five key indicators and the influence factors for female reproductive health status in Southeast Asian countries.Results:The reproductive health of Southeast Asian women were still at a lower level overall and varied in different regions and conntries.Women's education and attitude,accessibility of service,socioeconomic and cultural factors,etc.were the potential influencing factors.Conclusion:There is left quite large space for improvement to the reproductive health in Southeast Asian countries and efficient interventions can be achieved for the key and easier-improved risk factors such as education and in high-risk areas.
基金the National Science Fund for Distinguished Young Scholars(No.52125102)the China Postdoctoral Science Foundation(Nos.2022TQ0203 and 2022M722047)+1 种基金Fundamental Research Funds for the Central Universities(No.FRF-TP-2021-02C2)Shanghai Technical Barriers to Trade(No.2021TBT004).
文摘Post-heat treatment is generally adopted in the additive manufacturing field due to its alleviation of high residual stress and modification of rapid-solidified multilevel heterogeneous microstructure,and the related performance of the heat-treated counterparts calls for a systemic investigation to build a criterion of the heat treatment procedure.In this work,we focus on the heat treatment effects on the recrystallization of the Hastelloy X alloy produced by the laser powder bed fusion(LPBF)method,and the related surface passivation of the heat-treated counterparts is meticulously assessed as well.Results show that the multilevel heterostructure for LPBF Hastelloy X alloy consists of sub-micro dislocation cell substructures with Cr/Mo elemental segregation,fine columnar grains,and periodically-distributed molten pools.After heat treatment,partially and fully recrystallized structures for LPBF Hastelloy X alloys were achieved at 1100 and 1200℃for 1 h,respectively.Furthermore,the as-built LPBF Hastelloy X alloy shows superior corrosion resistance while the heat-treated one(1100℃)exhibits the worst in the borate buffer solution.The growth of passive film exhibited a highly linear correlation with the nucleation process controlled by diffusion,and high dislocation density and low angle grain boundary decreased the diffusion coefficient of cation vacancies,augmenting the nucleation sites of the passive film and enhancing its growth rate.Moreover,the micro-galvanic effect resulting from the partially recrystallized microstructure actively facilitated the formation of inhomogeneous porous passive films,leading to the worst corrosion resistance.
基金supported by the National Natural Science Foundation of China(No.U22B2065)the Science and Technology Fundamental Resources Investigation Program(No.2022FY10300).
文摘Laser powder bed fusion (LPBF) is a commonly used additive manufacturing (AM) method for efficiently producing intricate geometric components. This investigation examines factors such as pores, cellular structure, grain size, and inclusions from the manufacturing process that contribute to the corrosion resistance of LPBF DSS. Furthermore, the as-built LPBF duplex stainless steel (DSS) is primarily ferrite due to the rapid cooling process. Therefore, the transformation of ferrite to austenite after various heat treatments in LPBF DSS and its corresponding corrosion resistance are presented. Additionally, a new mixed powder method is proposed to increase the austenite content in the as-built LPBF DSS. This review also focuses on the passivation capability and pitting corrosion performance in LPBF and conventional DSS. This article summarizes the variations in microstructure between as-built and heat-treated LPBF DSS, with their impacts on corrosion resistance, offering insights for manufacturing highly corrosion-resistant LPBF DSS.
文摘Objective:To investigate the risk factors of severe postpartum hemorrhage(PPH)in cesarean section of twin pregnancy,and to provide clinical basis for pregnancy management and perioperative obstetric management of twin pregnancy.Methods:The clinical data of 631 twin pregnancies with gestational age28 weeks delivered by cesarean section at Peking University People's Hospital(PKUPH)from January 2004 to January 2017 were retrospectively analyzed.Methods of conception,the combined weight of twins,serum albumin level before cesarean section,operation time and other factors on the amount of blood loss during cesarean section were analyzed.Results:The proportion of severe PPH was significantly higher in in vitro fertilization-embryo transfer(IVF-ET)group,the combined weight of twins>6000g group,serum albumin before cesarean section<30 g/dl group than in the natural pregnancy group,4000–6000g group,<4000g group and serum albumin30 g/dl group respectively(P<0.05).The proportion of severe PPH in the elective surgery group of twin pregnancy was higher than that in the emergency surgery group,but the difference was not statistically significant(P>0.05).Moreover,according to the surgical indications,the emergency surgery group was divided into premature rupture of membranes(PROM),labor,fetal distress and others groups,no significant difference were detected among these groups(P>0.05).Conclusion:IVF-ET,the combined weight of twins,serum albumin before operation were significantly correlated with severe PPH of twin pregnancies delivered by cesarean section,revealing that it is necessary to strengthen pregnancy management of twin pregnancy.
