Dear Editor,Enterovirus 71(EV71)infection causes hand-foot-andmouth disease(HFMD)in infants and children.Patients with HFMD usually have good prognosis;however,in some extreme cases the infection can be accompanied by...Dear Editor,Enterovirus 71(EV71)infection causes hand-foot-andmouth disease(HFMD)in infants and children.Patients with HFMD usually have good prognosis;however,in some extreme cases the infection can be accompanied by central nervous system diseases,eventually leading to cardiorespiratory failure,and even death.Currently。展开更多
Grain refinement usually makes the materials stronger,while ductility has a dramatic loss.Here,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abund...Grain refinement usually makes the materials stronger,while ductility has a dramatic loss.Here,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time annealing.The microstructure characterization using electron backscattered scattering diffraction demonstrates that abundant geometrically necessary dislocations(GNDs)gather around the grain boundaries and twin boundaries after tensile deformation.Although coarse-grained(CG)samples undergo a larger plastic deformation than UFG samples,the GND density decreases with grain size ranging from UFG to CG.Transmission electron microscopy results reveal that the annealing twin boundary,which effectively hinders the dislocation slip and stores dislocation in grain interior,and the activation of multiple deformation twins are responsible for the superior strength–ductility synergy and work hardening ability.In addition,the yield strength of fully recrystallized Al_(0.1)CrFeCoNi follows a Hall–Petch relationship(σ_y=24+676d^(–1/2)),where d takes into account both grain boundaries and annealing twin boundaries.The strengthening effects of grain boundaries and annealing twin boundaries were also evaluated separately.展开更多
The morphology and molecular phylogeny of freshwater pleurostomatid ciliates are insufficiently explored.In the present study,we investigated three new Amphileptus species discovered in Lake Weishan and its vicinity,n...The morphology and molecular phylogeny of freshwater pleurostomatid ciliates are insufficiently explored.In the present study,we investigated three new Amphileptus species discovered in Lake Weishan and its vicinity,northern China,using standard alpha-taxonomic methods.Amphileptus paracarchesi sp.nov.is characterized by a lateral fossa(groove)in the posterior body portion,four macronuclear nodules,contractile vacuoles distributed along the dorsal margin,and 4-6 left and 44-50 right somatic kineties.Amphileptus pilosus sp.nov.differs from congeners by having 4-14 macronuclear nodules,numerous contractile vacuoles scattered throughout the cytoplasm,and 22-31 left and 35-42 right somatic kineties.Amphileptus orientalis sp.nov.is characterized by two ellipsoidal macronuclear nodules,three ventral contractile vacuoles,and about four left and 31-35 right somatic kineties.Phylogenetic analyses of nuclear small subunit ribosomal DNA(SSU rDNA)sequences indicate that the family Amphileptidae might be monophyletic while the genus Amphileptus is paraphyletic,as Pseudoamphileptus macrostoma robustly groups with Amphileptus sp.Although deep phylogenetic relationships of amphileptids are poorly resolved,multiple well-delimited species groups are recognizable within the genus Amphileptus.展开更多
基金supported by the Guangxi Natural Science Foundation Grant (2014GXNSFAA118200)
文摘Dear Editor,Enterovirus 71(EV71)infection causes hand-foot-andmouth disease(HFMD)in infants and children.Patients with HFMD usually have good prognosis;however,in some extreme cases the infection can be accompanied by central nervous system diseases,eventually leading to cardiorespiratory failure,and even death.Currently。
基金financially supported by the Sichuan Science and Technology Program(No.2021YFH0182)the Open Project Program of Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling(Anhui University of Technology,No.SKF22–02)+3 种基金the State Key Laboratory of Solidification Processing(Northwestern Polytechnical University,No.SKLSP202115)the Local Science and Technology Development Project of Shenzhen Guided by the Central Government(2021Szvup120)the Fundamental Research Funds for the Central Universities(Nos.2682021CX102 and 2682021GF026)the National Natural Science Foundation of China(No.11627901)。
文摘Grain refinement usually makes the materials stronger,while ductility has a dramatic loss.Here,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time annealing.The microstructure characterization using electron backscattered scattering diffraction demonstrates that abundant geometrically necessary dislocations(GNDs)gather around the grain boundaries and twin boundaries after tensile deformation.Although coarse-grained(CG)samples undergo a larger plastic deformation than UFG samples,the GND density decreases with grain size ranging from UFG to CG.Transmission electron microscopy results reveal that the annealing twin boundary,which effectively hinders the dislocation slip and stores dislocation in grain interior,and the activation of multiple deformation twins are responsible for the superior strength–ductility synergy and work hardening ability.In addition,the yield strength of fully recrystallized Al_(0.1)CrFeCoNi follows a Hall–Petch relationship(σ_y=24+676d^(–1/2)),where d takes into account both grain boundaries and annealing twin boundaries.The strengthening effects of grain boundaries and annealing twin boundaries were also evaluated separately.
基金supported by the National Natural Science Foundation of China(project nos.32030015,32170533,31961123002,32111530116)the China Postdoctoral Science Foundation(project no.2021M701276)+1 种基金the Slovak Research and Development Agency(project no.APVV-19-0076)the King Saud University,Saudi Arabia(project no.RSP2022R7).
文摘The morphology and molecular phylogeny of freshwater pleurostomatid ciliates are insufficiently explored.In the present study,we investigated three new Amphileptus species discovered in Lake Weishan and its vicinity,northern China,using standard alpha-taxonomic methods.Amphileptus paracarchesi sp.nov.is characterized by a lateral fossa(groove)in the posterior body portion,four macronuclear nodules,contractile vacuoles distributed along the dorsal margin,and 4-6 left and 44-50 right somatic kineties.Amphileptus pilosus sp.nov.differs from congeners by having 4-14 macronuclear nodules,numerous contractile vacuoles scattered throughout the cytoplasm,and 22-31 left and 35-42 right somatic kineties.Amphileptus orientalis sp.nov.is characterized by two ellipsoidal macronuclear nodules,three ventral contractile vacuoles,and about four left and 31-35 right somatic kineties.Phylogenetic analyses of nuclear small subunit ribosomal DNA(SSU rDNA)sequences indicate that the family Amphileptidae might be monophyletic while the genus Amphileptus is paraphyletic,as Pseudoamphileptus macrostoma robustly groups with Amphileptus sp.Although deep phylogenetic relationships of amphileptids are poorly resolved,multiple well-delimited species groups are recognizable within the genus Amphileptus.
