Rumer's transformation,in biology,as the negation,in classical logic

In this article, we make a connection between the Rumer transformation, used in the study of the genetic code‐doublets, and the negation of classic logic. A unified classification is given, relying on two Klein's 4‐groups describing the symmetries of the 16 doublets of nitrogenous bases and those of the 16 binary connectives of classic logic, both groups being subgroups of a larger noncommutative group with eight elements we identify as the dihedral group D₄. Also, some connections with other works are briefly considered. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003     

Nodal,ionic, and atomic radii,in compounds

The distance in an atom from the nucleus to the final node in the wavefunction of a valence electron has been defined as the nodal radius. This parameter, in conjunction with a Thomas-Fermi pseudo-potential, is used to calculate the nearest-neighbor distance in some octet compounds. Calculated values of the atomic radii are compared with the semi-empirical ionic and tetrahedral radii for atoms in these compounds.     

Congresses,Conferences, Symposia,Meetings, and Seminars held in 1994

Information

Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994     

Congresses, conferences, symposia, meetings, and seminars held in 1994

Information Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences Held with the Participation of the Russian Academy of Sciences

Congresses, conferences, symposia, meetings, and seminars held in 1994     

Congresses,conferences, symposia,meetings, and seminars held in 1994

Information Congresses, Conferences, Symposia, Meetings, and Seminars in the Field of Chemical Sciences Held with the Participation of the Russian Academy of Sciences

International conference on chemical and biological disarmament and conversion (MOSCON-94)     

Congresses, conferences, symposia, meetings, and seminars held in 1994

Information

Congresses, conferences, symposia, meetings, and seminars held in 1994     

Congresses,Conferences, Symposia,Meetings, and Seminars held in 1994

Information

Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994     

西安市老年人末梢血铜、锌、铁、镁、钙元素含量分析

为调查60岁以上老年人体内微量元素及钙、镁的含量,采用原子吸收光谱法对西安市60岁以上的老年人末梢血中的铜、锌、铁、镁、钙的含量进行了测定,观察了5元素的缺乏率及随年龄的增长5元素的缺乏情况.结果表明,60岁以上老年人,元素过量的情况鲜见;铜、锌、铁、镁、钙的缺乏率分别为37.87%0,11.76%,21.51%,2....     

ICP-AES法测定铝中铁、硅、铜、镓、镁、锌、锰和钛

用 50g L氢氧化钠溶液溶解铝样品 ,硝酸 (1 1 )酸化 ,以ICP AES测定其中铁、硅、铜、镓、镁、锌、锰和钛等 8种杂质元素。     

ICP-MS测定化妆品中铍、镉、铊、铬、砷、碲、钕、铅

目的：建立化妆品中铍、镉、铊、铬、砷、碲、钕、铅8种有害元素的测定方法。方法：采用电感耦合等离子体质谱法,样品采用微波消解,以钇、锂、铟、铋为内标作定量分析。结果：各元素和内标元素在一定浓度范围内的质量数比值均与浓度呈良好的线性关系,线性方程的相关系数均大于0.9998,平均回收率为95%~104%,相对标准偏差(RSD)均小于3%。结论：该方法灵敏度高,准确,可为化妆品中上述元素的限量检查提供参考。     

猪胰脏中铁钙镁铜铅锌镉锰钴镍的测定

采用硝酸－过氧化氢在自动回流消化仪中消化猪胰脏,火焰原子吸收光度法测定铁、钙、镁、铜、锌、铅、镉、锰、钴、镍的含量。,方法简便,快速,结果令人满意,并对猪胰脏食用价值进行了评价。     

Spurenelemente (Zn, Cu, As, Sb, P) in Siliciumcarbid

Ohne Zusammenfassung     

Spuren von Al, Fe, Mn, Pb, M, Sn, Ag, Zn, V und Ti in reinem Kaliumhydroxid

Ohne Zusammenfassung     

INAA application in the assessment of Ag, Co, Cr, Fe, Hg, Rb, Sb, Sc, Se, and Zn mass fraction in pediatric and young adult prostate glands

The effect of age on trace element contents in intact prostate of 50 apparently healthy 0–30 year old males was investigated by neutron activation analysis with high resolution spectrometry of long-lived radionuclides. Mean values (M ± SΕΜ) for mass fraction (milligram per kilogram, on dry-weight basis) of trace elements were: Ag 0.0708 ± 0.0096, Co 0.0348 ± 0.0040, Cr 0.466 ± 0.069, Fe 100 ± 10, Hg 0.0258 ± 0.0025, Rb 12.6 ± 0.8, Sb 0.0576 ± 0.0066, Sc 0.0125 ± 0.0016, Se 0.478 ± 0.031, and Zn 273 ± 31, respectively. A strongly pronounced tendency of age-related increase in Se and Zn mass fraction and of age-related decrease in Co, Cr, Fe, and Sc mass fraction was observed in period of life from 0 to 30 years.