同源染色体联会时形成的联会复合体(Synaptonemal complex,SC)是由减数分裂前期Ⅰ多种蛋白质聚集而成的超级复合结构。生殖细胞特异性的核蛋白C(2)M(Crossover suppressor on 2 of Manheim)在染色体上高度聚集可以诱导SC的形成。本文采...同源染色体联会时形成的联会复合体(Synaptonemal complex,SC)是由减数分裂前期Ⅰ多种蛋白质聚集而成的超级复合结构。生殖细胞特异性的核蛋白C(2)M(Crossover suppressor on 2 of Manheim)在染色体上高度聚集可以诱导SC的形成。本文采用酵母双杂交方法,利用C(2)M的诱饵表达载体筛选果蝇c DNA文库,共发现40个可能与C(2)M相互作用的蛋白,包括多种DNA及组蛋白结合蛋白、ATPase、转录调节因子。从筛选的结果中,选取wech和Psf1基因构建了转基因果蝇,并在生殖细胞中进行了基因沉默,结果显示联会复合体的消失受到延迟。上述结果表明Wech和Psf1蛋白可能与C(2)M形成复合物,共同参与联会复合体的形成或其稳定性的维持。展开更多
The Fermat–Pramanik series are like below: .The mathematical principle has been established by factorization principle. The Fermat-Pramanik tree can be grown. It produces branched Fermat-Pramanik series using same pr...The Fermat–Pramanik series are like below: .The mathematical principle has been established by factorization principle. The Fermat-Pramanik tree can be grown. It produces branched Fermat-Pramanik series using same principle making Fermat-Pramanik chain. Branched chain can be propagated at any point of the main chain with indefinite length using factorization principle as follows: Same principle is applicable for integer solutions of A<sup>M</sup>+B<sup>2</sup>=C<sup>2</sup>which produces series of the type . It has been shown that this equation is solvable with N{A, B, C, M}. where , , M=M<sub>1</sub>+M<sub>2</sub> and M<sub>1</sub>>M<sub>2</sub>. Subsequently, it has been shown that using M= M<sub>1</sub>+M<sub>2</sub>+M<sub>3</sub>+... The combinations of Ms should be taken so that the values of both the parts (C<sub>n</sub>+B<sub>n</sub>) and (C<sub>n</sub>-B<sub>n</sub>) should be even or odd for obtaining Z{B,C}. Hence, it has been shown that the Fermat triple can generate a) Fermat-Pramanik multiplate, b) Fermat-Pramanik Branched multiplate and c) Fermat-Pramanik deductive series. All these formalisms are useful for development of new principle of cryptography. .展开更多
The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center...The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center of Cp.The vibration modes were reasonably assigned,absorption of ν s M\|Cp (A\-1) (M=Ti and Zr) vibration all appear in 310?cm -1 or so,while ν as M\|Cp (B) appear around 410?cm -1 and 360?cm -1 for Ti and Zr respectively.The influence of the center metal atoms and the substituents upon the NMR and FT\|IR spectra were discussed.展开更多
利用可再生能源电催化二氧化碳(CO_(2))还原成燃料或化学品是实现人工碳循环的理想手段。然而,催化剂的活性、选择性和稳定性限制了电催化CO_(2)还原反应的应用。碳基金属单原子材料(single⁃atom metal catalysts on the carbon⁃based m...利用可再生能源电催化二氧化碳(CO_(2))还原成燃料或化学品是实现人工碳循环的理想手段。然而,催化剂的活性、选择性和稳定性限制了电催化CO_(2)还原反应的应用。碳基金属单原子材料(single⁃atom metal catalysts on the carbon⁃based materials,M⁃SACs@C)具有高活性、高选择性和高金属原子利用率,被认为是一种理想的电催化CO_(2)还原催化剂,因此吸引了研究者的广泛关注。M⁃SACs@C能将CO_(2)还原成一氧化碳、甲酸、甲烷、甲醇、乙烯、乙醇等。本文从CO_(2)还原产物种类的角度出发,对M⁃SACs@C在CO_(2)还原反应中的应用进行了概括。我们重点关注了碳基金属单原子的位点构型和活性来源。此外,本文也对M⁃SACs@C上CO_(2)还原反应的机制进行了分析与展望。可控合成结构均一且负载量高的M⁃SACs@C、明确CO_(2)还原反应机制、增强活性位点的稳定性是M⁃SACs@C走向产业化的必经之路。展开更多
文摘同源染色体联会时形成的联会复合体(Synaptonemal complex,SC)是由减数分裂前期Ⅰ多种蛋白质聚集而成的超级复合结构。生殖细胞特异性的核蛋白C(2)M(Crossover suppressor on 2 of Manheim)在染色体上高度聚集可以诱导SC的形成。本文采用酵母双杂交方法,利用C(2)M的诱饵表达载体筛选果蝇c DNA文库,共发现40个可能与C(2)M相互作用的蛋白,包括多种DNA及组蛋白结合蛋白、ATPase、转录调节因子。从筛选的结果中,选取wech和Psf1基因构建了转基因果蝇,并在生殖细胞中进行了基因沉默,结果显示联会复合体的消失受到延迟。上述结果表明Wech和Psf1蛋白可能与C(2)M形成复合物,共同参与联会复合体的形成或其稳定性的维持。
文摘The Fermat–Pramanik series are like below: .The mathematical principle has been established by factorization principle. The Fermat-Pramanik tree can be grown. It produces branched Fermat-Pramanik series using same principle making Fermat-Pramanik chain. Branched chain can be propagated at any point of the main chain with indefinite length using factorization principle as follows: Same principle is applicable for integer solutions of A<sup>M</sup>+B<sup>2</sup>=C<sup>2</sup>which produces series of the type . It has been shown that this equation is solvable with N{A, B, C, M}. where , , M=M<sub>1</sub>+M<sub>2</sub> and M<sub>1</sub>>M<sub>2</sub>. Subsequently, it has been shown that using M= M<sub>1</sub>+M<sub>2</sub>+M<sub>3</sub>+... The combinations of Ms should be taken so that the values of both the parts (C<sub>n</sub>+B<sub>n</sub>) and (C<sub>n</sub>-B<sub>n</sub>) should be even or odd for obtaining Z{B,C}. Hence, it has been shown that the Fermat triple can generate a) Fermat-Pramanik multiplate, b) Fermat-Pramanik Branched multiplate and c) Fermat-Pramanik deductive series. All these formalisms are useful for development of new principle of cryptography. .
文摘The NMR and FT\|IR Spectra of ten (ηC 6H\-9CRR′ Cp)\-2MCl\-2 (M=Ti,Zr) were measured.The constructions of the compounds were identified by 1H NMR and 13 C NMR spectra.All complexes are bonded by M\|Cp through center of Cp.The vibration modes were reasonably assigned,absorption of ν s M\|Cp (A\-1) (M=Ti and Zr) vibration all appear in 310?cm -1 or so,while ν as M\|Cp (B) appear around 410?cm -1 and 360?cm -1 for Ti and Zr respectively.The influence of the center metal atoms and the substituents upon the NMR and FT\|IR spectra were discussed.
文摘利用可再生能源电催化二氧化碳(CO_(2))还原成燃料或化学品是实现人工碳循环的理想手段。然而,催化剂的活性、选择性和稳定性限制了电催化CO_(2)还原反应的应用。碳基金属单原子材料(single⁃atom metal catalysts on the carbon⁃based materials,M⁃SACs@C)具有高活性、高选择性和高金属原子利用率,被认为是一种理想的电催化CO_(2)还原催化剂,因此吸引了研究者的广泛关注。M⁃SACs@C能将CO_(2)还原成一氧化碳、甲酸、甲烷、甲醇、乙烯、乙醇等。本文从CO_(2)还原产物种类的角度出发,对M⁃SACs@C在CO_(2)还原反应中的应用进行了概括。我们重点关注了碳基金属单原子的位点构型和活性来源。此外,本文也对M⁃SACs@C上CO_(2)还原反应的机制进行了分析与展望。可控合成结构均一且负载量高的M⁃SACs@C、明确CO_(2)还原反应机制、增强活性位点的稳定性是M⁃SACs@C走向产业化的必经之路。
