Rich, Alexander

Rich, Alexander, and Norman Davidson, eds. Structural Chemistry and Molecular Biology. San Francisco Freeman, 1968. 

Otagawa T, Madou M, Wing S, Rich-Alexander J, Kusanagi S, Fujioka T and Yasuda A 1990 Planar microelectrochemical carbon monoxide sensors Sensors Actuators B 1 319-25... 

Prof. Alexander Rich M.D., Professor of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts... 

I appreciate the helpful suggestions made by Dr. Alexander Rich, Prof. Christian Bauer, Dr. Walter Bodmer, Drs. Joseph and Celia Bonaventura, Dr. Sydney Brenner, Prof. Maur-izio Brunori, Dr. H. Frank Bunn, Prof. Patricia H. Clarke, Dr. Thomas E. Creighton, Dr. Richard E. Koehn, Dr. Arthur M. Lesk, Dr. Richard C. Lewontin, Dr. Robin N. Perutz, and Dr. Graham Shelton concerning this paper. To all these colleagues I wish to express my gratitude. 

Baron Alexander von Humboldt, 1769-1859. German naturalist and traveler. His Narrative of Travels to the Equinoctial Regions of America between 1799 and 1844 and his Political Essay on the Kingdom of New Spain are a rich source of information on the history of chemistry in Latin America. He introduced the Peruvian fertilizer guano to European agricultural chemists. Because of the breadth of his interests he had an unusually clear understanding of the interrelationships of the various branches of... 

The 2 -hydroxyl groups of the cytosine and of the guanosine in the anticodon are methylated. Moving far up the anticodon stem one can see two groups of base triplets which utilize both Watson-Crick and Hoogsteen types of base pairing. Drawing courtesy of Alexander Rich. 

Alexander s eyes shone for his adopted sister as the two sailed lightly around the parquet floor, and Padorin wondered what particular breed of love was returned in Dusha s radiant eyes. He fancied he could hear the rustle of her silks as a rich accompaniment to the orchestra, as well as her heartbeat setting the rhythm. 

Phase III was divided into three parts by Alexander and Napper namely into a period of smooth monomer supply of the active centres from aqueous phase and from monomer-rich particle layers, a period of viscosity increase in the particles (by affecting monomer diffusion, viscosity begins to control the reaction rate) and the period of approach to the polymer glass transition [126,145,146]. 

In the 1870s the demand for ivory, which was harvested from the trunks of a rapidly dwindling supply of hapless elephants, was high and increasing. Ivory was a favorite of the rich and famous, who used it for items such as jewelry, piano keys, billiard balls, etc., and there was a desperate need to find new materials for some of these applications. Alexander Parkes, a prolific English inventor, and John Wesley Hyatt, a great American... 

Alexander Rich and his associates discovered a third type of DNA helix when they solved the structure of dCGCGCG. They found that this hexanucleotide forms a duplex of antiparallel strands held together by Watson-Crick base-pairing, as expected. What was surprising, however, was that this double helix was left-handed, in contrast with the right-handed screw sense of the A and B helices. Furthermore, the phosphates in the backbone zigzagged hence, they called this new form Z-DNA (Figure 27.10). 

The three-dimensional structure of a tRNA molecule was first determined in 1974 through x-ray crystallographic studies carried out in the laboratories of Alexander Rich and Aaron Klug. The structure determined, that of yeast phenylalanyl-tRNA, is highly similar to all structures subsequently determined for other tRNA molecules. The most important properties of the tRNA structure are ... 

Nittler L. R. and Alexander C. M. O D. (1999) Automatic identification of presolar Al- and Ti-rich oxide grains from ordinary chondrites. In Lunar Planet Set XXX, 2041. The Lunar and Planetary Institute, Houston (CD-ROM). 

Chemical compositions of chondrules have been determined from extracted samples using neutron activation analysis and by in situ analysis in polished sections using electron microprobe and ion probe analysis (see e.g., Gooding et al, 1980 Grossman et al, 1988 Alexander, 1995). Chondrules typically show flat refractory abundances that are relatively close to the mean chondrite value and abundances of moderately volatile elements that scatter more widely about the mean. Type II chondrules are relatively unfractionated with near-CI levels of refractories and moderately volatile elements. However, type I chondrules show systematic depletions of moderately volatile elements and a broader spread of refractory abundances with the silicon-rich type IB chondrules being poorer in refractories than the silicon-poor type IA chondrules (Figure 18). The source of the fractionations in type I chondrules is discussed below. 

The effects of aqueous alteration are apparent in the least equilibrated ordinary chondrites such as Semarkona, Bishunpur, and Chainpur. The effects of alteration are most widely developed in the matrices of these chondrites (Hutchison et al., 1987 Alexander et al., 1989a,b), but alteration of chondrules has recently been recognized (Hutchison et al., 1998 Grossman et al., 2000, 2002). In these chondrites, alteration of the matrices is not complete and precursor phases are still present. The dominant alteration phase in the matrix is an amorphous phase and an iron-rich smectite phase replacing olivine. 

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