Using compounds modified by the isotopes carbon-13 and nitrogen-15 helps conduct research in various fields of science, such as medicine, pharmacology, pharmacokinetics, metabolism, agriculture, and others. In the cas...Using compounds modified by the isotopes carbon-13 and nitrogen-15 helps conduct research in various fields of science, such as medicine, pharmacology, pharmacokinetics, metabolism, agriculture, and others. In the case of the availability of reliable, express, and cheap methods, the area of their use will gradually expand. A determination of the atomic fraction of the isotopes carbon-13 and nitrogen-15 directly in glycine, leucine, isoleucine, and alanine is proposed;the modification concerns all centers or one or more identical carbon and nitrogen centers separately, as well as both isotopes at the same time. There are defined mass lines of the mass spectrum of each amino acid, through which the isotopic content of carbon and nitrogen is calculated. The processes that must be taken into account for the determination of the isotopic content are also established. Isotopic analysis of these compounds until now was carried out by transforming them into carbon oxide, dioxide, and molecular nitrogen, and determination of their content in individual centers was impossible.展开更多
由中国铸造协会联合锻压、热处理、焊接等行业协会主办的“2024 METAL THAILAND”将于2024年9月18-20日在泰国曼谷国际贸易展览中心举办。一、组织机构主办单位:中国铸造协会中国锻压协会中国热处理行业协会中国焊接协会承办单位:北京...由中国铸造协会联合锻压、热处理、焊接等行业协会主办的“2024 METAL THAILAND”将于2024年9月18-20日在泰国曼谷国际贸易展览中心举办。一、组织机构主办单位:中国铸造协会中国锻压协会中国热处理行业协会中国焊接协会承办单位:北京中铸世纪展览有限公司二、日程安排布展时间:2024年9月15-17日开展时间:2024年9月18-20日撤展时间:2024年9月21日三、同期活动第六届亚洲铸造论坛、先进铸造技术研讨会、中泰铸造企业交流对接会等。展开更多
文摘Using compounds modified by the isotopes carbon-13 and nitrogen-15 helps conduct research in various fields of science, such as medicine, pharmacology, pharmacokinetics, metabolism, agriculture, and others. In the case of the availability of reliable, express, and cheap methods, the area of their use will gradually expand. A determination of the atomic fraction of the isotopes carbon-13 and nitrogen-15 directly in glycine, leucine, isoleucine, and alanine is proposed;the modification concerns all centers or one or more identical carbon and nitrogen centers separately, as well as both isotopes at the same time. There are defined mass lines of the mass spectrum of each amino acid, through which the isotopic content of carbon and nitrogen is calculated. The processes that must be taken into account for the determination of the isotopic content are also established. Isotopic analysis of these compounds until now was carried out by transforming them into carbon oxide, dioxide, and molecular nitrogen, and determination of their content in individual centers was impossible.
文摘由中国铸造协会联合锻压、热处理、焊接等行业协会主办的“2024 METAL THAILAND”将于2024年9月18-20日在泰国曼谷国际贸易展览中心举办。一、组织机构主办单位:中国铸造协会中国锻压协会中国热处理行业协会中国焊接协会承办单位:北京中铸世纪展览有限公司二、日程安排布展时间:2024年9月15-17日开展时间:2024年9月18-20日撤展时间:2024年9月21日三、同期活动第六届亚洲铸造论坛、先进铸造技术研讨会、中泰铸造企业交流对接会等。
