In parts of the world where teosinte and maize are grown in close proximity, there is concern about gene flow between them. Pollen is the primary vehicle for gene flow. Quantifying the biophysical properties of pollen, such as its settling speed and dehydration rate, is important for evaluating outcrossing potential. These properties were measured for teosinte (Zea mays subsp. parviglumis) poll...

A DNA-peptide complex that is soluble in 0.2m-sodium chloride can be prepared by trypsin digestion of calf thymus nucleoprotein. The trypsin-digested nucleoprotein molecule contains about 70% of DNA and 30% of peptides by weight, and consists of one DNA molecule associated with arginine-rich peptides. A series of trypsin-digested nucleoprotein preparations differing only in molecular weight wer...

The extracellular aminopeptidase of Aeromonas proteofytica was purified to homogeneity by a simplified procedure that proved feasible for the isolation of gram quantities of this enzyme. Precipitation with ammonium sulfate and acetone, heating at 70”, and chromatography on Sephadex G-75 and DEAE-Sephadex yielded a product that showed a high degree of purity by polyacrylamide and free boundary e...

Recent studies of the evolution of protein molecules have been principally confined to studies of a single protein, such as hemoglobin or cytochrome c, in numerous representatives of the phylogenetic scale (1, 2). Such studies trace the changes in a protein molecule as a function of alterations of its host. A second approach would be to study the evolution of functionally related proteins by co...

The aqueous solution behavior of some rare-earth chlorides has been investigated at 25° C. in the concentration range between 0.02 molal and saturation. Density measurements on solutions of lanthanum, neodymium, samarium, gadolinium, dysprosium, erbium, and ytterbium chlorides were carried out by a pycnometric method with an estimated accuracy of 1 x 10-5 gm.per ml. From the density data the ap...

Sulfhemoglobins were prepared from hemoglobin A and carboxypeptidase A-treated hemoglobin. The synthesis was achieved by oxidation of the ferric hemoglobins with H,O, followed by reaction with excess hydrosulfide. ERR spectra of these ferric sulfhemoglobins at high pH were well resolved from the resonances of contaminating ferric hemoglobins. Thus, quantitative ERR measurements provided a conve...

In this study, for the purpose of determining physical and aerodynamic properties, some varieties of wheat, barley, chickpea and lentil were used. The length, width, thickness, geometric mean diameter, equivalent sphere diameter, sphericity, seed mass, bulk density, true density, projected area, terminal velocity, drag coefficient of each grain variety were determined. The theoretical terminal ...

Some physical properties of musk lime (Citrus microcarpa) were determined in this study. The average moisture content (wet basis) of the fruit was found to be 85.10 (±0.72) %. The mean of length, width and thickness of the fruit was 26.36 (±0.97), 26.40 (±1.04) and 25.26 (±0.94) mm respectively. The average value for geometric mean diameter, sphericity, aspect ratio, mass, surface area, volume,...