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At least 757 records · Page 42
All sourcesNASA NTRSDOE OSTI
NASA NTRS1972

Recently published protein sequences. I.

Some polypeptide sequences that have been published in the 1972 scientific literature are listed. Only selected sequences are included. The compilation has two objectives. Current information between periods when more comprehensive compilations are published is to be assembled and the use of data that do not include arrangements of unsequenced peptides for 'maximum homology' is to be encouraged.

Jukes, T. H.↗
NASA NTRS1972

Calcified proteins in the sedimentary environment.

Amino acid diagenesis is considered in relatively young fossil mollusk shells which are capable of preserving some of their original organic constituents. The rate of change of amino acid content in fossils is related to time and diagenetic temperature. Thus, the amino acid content provides information relating to the approximate ages of shells. Pleistocene temperatures and sea level changes in Florida are discussed, along with stratification correlation.

Mitterer, R. M.↗
NASA NTRS1973

Recently published protein sequences. III

A listing of polypeptide sequences announced in published papers in 1972 and 1973 is given. The listing contains twenty one new sequencies which were selected by using the distinction of Asn, Asp, Gln, and Glu from Asx and Glx, and the absence of unsequenced peptides as criteria.

Jukes, T. H.↗
NASA NTRS1978

The REH theory of protein and nucleic acid divergence - A retrospective update

The random evolutionary hits (REH) theory of evolutionary divergence, originally proposed in 1972, is restated with attention to certain aspects of the theory that have caused confusion. The theory assumes that natural selection and stochastic processes interact and that natural selection restricts those codon sites which may fix mutations. The predicted total number of fixed nucleotide replacements agrees with data for cytochrome c, a-hemoglobin, beta-hemoglobin, and myoglobin. The restatement analyzes the magnitude of possible sources of errors and simplifies calculational methodology by supplying polynomial expressions to replace tables and graphs.

Holmquist, R.↗
NASA NTRS1978

Evolution of early life inferred from protein and ribonucleic acid sequences

The chemical structures of ferredoxin, 5S ribosomal RNA, and c-type cytochrome sequences have been employed to construct a phylogenetic tree which connects all major photosynthesizing organisms: the three types of bacteria, blue-green algae, and chloroplasts. Anaerobic and aerobic bacteria, eukaryotic cytoplasmic components and mitochondria are also included in the phylogenetic tree. Anaerobic nonphotosynthesizing bacteria similar to Clostridium were the earliest organisms, arising more than 3.2 billion years ago. Bacterial photosynthesis evolved nearly 3.0 billion years ago, while oxygen-evolving photosynthesis, originating in the blue-green algal line, came into being about 2.0 billion years ago. The phylogenetic tree supports the symbiotic theory of the origin of eukaryotes.

Dayhoff, M. O.↗