[Objective]The paper briefly summarizes the gene cloning and molecular research progress of vitellogenin in crustaceans belonging to Decapod.[Method]The molecular characteristics of identified Vg proteins in crustacea...[Objective]The paper briefly summarizes the gene cloning and molecular research progress of vitellogenin in crustaceans belonging to Decapod.[Method]The molecular characteristics of identified Vg proteins in crustacean are reviewed from the aspects of protein synthesis,molec-ular structure,phylogenetic evolution,hormonal regulation of gene expression and biological functions.[Result]The similarity of structure and func-tion in homologous protein are pointed out;phylogenetic relationships among molecules are analyzed;the main characteristics of Vg interspecific protein in Decapod are summarized,and the special parts different from other species are raised.[Conclusion]The study can offer some help for the further study of Vg gene,and provides theoretical basis for ovary development mechanism of crabs.展开更多
The abandoned roadways(ARs)in front of the longwall face catastrophic instability will seriously hamper mining progress,which is a complicated process related to the stress environment,the roadway section,and the mech...The abandoned roadways(ARs)in front of the longwall face catastrophic instability will seriously hamper mining progress,which is a complicated process related to the stress environment,the roadway section,and the mechanical properties of the surrounding rock.The cusp catastrophe theory is employed to establish a state identification model for the irregular coal pillar-roof system(CPRS)formed by the ARs and re-mining entries.To begin,the state discrimination equation(4p)for the gradual CPRS is derived,and the critical value at which the system transitions into an unstable state under quasi-static conditions is determined.The results indicated that when 16.49 m≤L≤22.63 m(L denotes the equivalent span of the intersection roof)and 0<R_(e)≤2.61 m(Re denotes the width of the elastic zone within the triangular coal pillar),the triangular CPRS is inherently unstable.Similarly,for trapezoidal CPRS configurations where the length Lm(the span of the right-angled trapezoid roof in the propulsion direction)varies from 4.0 to 12.60 m,the system is unstable as well.Subsequently,the model was further enhanced by accounting for the impact of the P.(advance stress increment load),where a critical criterion for the catastrophic instability of the CPRS was proposed,which represented the external energy required to transition the CPRS from an unstable state to catastrophic instability in diferent mining stages.After that,the stability degree of the irregular coal pillar was categorized,and a coupling zoning control technology was applied to CPR operations.Field monitoring results demonstrated the effectiveness of the zoning control technology,providing valuable guidance for similar mining practices.展开更多
基金Projects supported by the Central Public-interest Scientific Institution Basal Research Fund(2018HY-ZD0402)the Jiangsu Province “Creation of Major New Varieties of Agriculture” development program(PZCZ201746)the National Natural Science Foundation of China(31472003)
基金funded by Special Fund for Agro-scientific Research in the Public Interest(201003070)Central Public-interest Scientific Institution Basal Research Fund(2011-JBFB02)
文摘[Objective]The paper briefly summarizes the gene cloning and molecular research progress of vitellogenin in crustaceans belonging to Decapod.[Method]The molecular characteristics of identified Vg proteins in crustacean are reviewed from the aspects of protein synthesis,molec-ular structure,phylogenetic evolution,hormonal regulation of gene expression and biological functions.[Result]The similarity of structure and func-tion in homologous protein are pointed out;phylogenetic relationships among molecules are analyzed;the main characteristics of Vg interspecific protein in Decapod are summarized,and the special parts different from other species are raised.[Conclusion]The study can offer some help for the further study of Vg gene,and provides theoretical basis for ovary development mechanism of crabs.
基金support from the Major Project of Regional Joint Foundation of China(Grant No.U21A20107)the Natural Science Foundation of China(Grant No.52074239)+1 种基金Xinjiang Uygur Autono-mous Region Key R&D Project Task Special-Department and Department Linkage Project(Grant No.2022B01051)the Xinjiang Uygur Autonomous Region Tianchi Introduction Plan(Grant No.2024XGYTCYC03).
文摘The abandoned roadways(ARs)in front of the longwall face catastrophic instability will seriously hamper mining progress,which is a complicated process related to the stress environment,the roadway section,and the mechanical properties of the surrounding rock.The cusp catastrophe theory is employed to establish a state identification model for the irregular coal pillar-roof system(CPRS)formed by the ARs and re-mining entries.To begin,the state discrimination equation(4p)for the gradual CPRS is derived,and the critical value at which the system transitions into an unstable state under quasi-static conditions is determined.The results indicated that when 16.49 m≤L≤22.63 m(L denotes the equivalent span of the intersection roof)and 0<R_(e)≤2.61 m(Re denotes the width of the elastic zone within the triangular coal pillar),the triangular CPRS is inherently unstable.Similarly,for trapezoidal CPRS configurations where the length Lm(the span of the right-angled trapezoid roof in the propulsion direction)varies from 4.0 to 12.60 m,the system is unstable as well.Subsequently,the model was further enhanced by accounting for the impact of the P.(advance stress increment load),where a critical criterion for the catastrophic instability of the CPRS was proposed,which represented the external energy required to transition the CPRS from an unstable state to catastrophic instability in diferent mining stages.After that,the stability degree of the irregular coal pillar was categorized,and a coupling zoning control technology was applied to CPR operations.Field monitoring results demonstrated the effectiveness of the zoning control technology,providing valuable guidance for similar mining practices.
