Stability of forage yield and quality in pearl millet hybrids heterogenous for rust resistance     

J. P. Wilson  W. W. Hanna  R. N. Gates 《Euphytica》1993,72(3):163-170

Summary The susceptible pearl millet hybrid Tifleaf 1, the resistant hybrid Tifleaf 2, and two experimental 3-way hybrids with different proportions of resistant and susceptible plants were evaluated for rust resistance and forage yield and quality in 1990, 1991, and 1992. Different environmental conditions were obtained by varying planting date, planting density, and fungicide applications across three years of evaluation in the field. Rust severity of forage was negatively correlated with late season green yield, dry matter yield, in vitro dry matter digestibility, and digestible dry matter yield. The stability across environments of the 3-way hybrids was intermediate between resistant Tifleaf 2 and susceptible Tifleaf 1 for rust severity and the yield and quality measurements negatively correlated with rust severity. Mixtures of resistant and susceptible plants would probably provide greater control of rust than measured in these small-plot experiments. Although a mixture of resistant and susceptible plants appears to provide an alternative to monogenic control of rust in forage pearl millets, identification and utilization of additional sources of resistance would be beneficial to improve the performance of 3-way hybrids.  相似文献   

Supercritical fluid extraction of organochlorine pesticides in eggs   总被引：2，自引：0，他引：2  

Fiddler W  Pensabene JW  Gates RA  Donoghue DJ 《Journal of agricultural and food chemistry》1999,47(1):206-211

The efficacy of supercritical fluid extraction (SFE) for the recovery of 16 common organochlorine pesticides (OCPs) from liquid whole eggs was investigated by employing supercritical carbon dioxide (SC-CO(2)) without the use of a solvent modifier to minimize interfering coextractives. The OCPs tested included aldrin; alpha-, beta-, delta-, and gamma-BHCs; p,p'-DDD, -DDE, and -DDT; dieldrin; endosulfans I, II, and sulfate; endrin; endrin aldehyde; heptachlor; and heptachlor epoxide. The SFE conditions were as follows: 10000 psi (680 bar), 40 degrees C, SC-CO(2) flow rate of 3.0 L/min with an extraction time of 40 min for a total of 120 L of CO(2). The OCPs were trapped off-line in an SPE cartridge containing Florisil and then eluted by an acetone/hexane mixture and analyzed by gas chromatography-electron capture detection (GC-ECD). Recovery studies were carried out on homogenized eggs fortified at the 0.05, 0.10, and 0.20 ppm levels. At the lowest level, 0.05 ppm, recoveries ranged from 81.8 to 108.3%, with CVs < 9.8%. All recoveries were significantly higher than those obtained by an AOAC/FDA solvent extraction method. Eggs containing incurred endosulfan I were also effectively extracted by SFE. This study suggests that the application of SFE for the extraction of OCPs from eggs will result in significant savings in analysis time and lower solvent use and disposal costs compared to conventional solvent extraction procedures.  相似文献   

THE CONCILIUM BIBLIOGRAPHICUM     

Gates GE 《Science (New York, N.Y.)》1926,64(1658):356-357

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PARADICHLOROBENZENE,AN EFFECTIVE HERBARIUM INSECTICIDE     

Gates FC 《Science (New York, N.Y.)》1935,81(2105):438-439

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NEWLY ELECTED OFFICERS OF THE ASSOCIATION     

Gates AI 《Science (New York, N.Y.)》1934,79(2040):88-89

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INVESTIGATIONS ON THE BACTERIOLOGY OF EPIDEMIC INFLUENZA     

Olitsky PK  Gates FL 《Science (New York, N.Y.)》1923,57(1467):159-166

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Effect of residual ascorbate on determination of nitrite in commercial cured meat products     

J B Fox  R C Doerr  R Gates 《Journal of the Association of Official Analytical Chemists》1984,67(4):692-697

Residual ascorbate in cured meat slurries results in different amounts of pigment being produced from different Griess reagent combinations. The phenomenon was used to study residual ascorbate in commercial cured meat products which had a variety of textures, acidities, moisture and meat content, fat, homogeneity, initial nitrite, and processing conditions. Diluting and heating the samples according to the AOAC procedure did not completely eliminate the ascorbate interference, but making the sample alkaline did. Determining nitrite separately in supernate and precipitate from the first dilution showed the effect of heating to be the elimination of interferences and solubilization or extraction of nitrite from the precipitate.  相似文献   

Relationships among economic characters in lentil     

A. Hamdi  W. Erskine  P. Gates 《Euphytica》1991,57(2):109-116

Summary There are several reports of the association among lentil characters based on a few, relatively similar lines grown in single environments. Their results have often been inconsistent because of inadequate sampling of genotypes and environments. This study examined associations between economic characters in lentil over a wide range of genetic material and environments in West Asia. The first part of the study concerned correlations within large samples from the world lentil collection grown in two seasons, and the second part covered a smaller sample of genetic material from the collection sown over a wider range of conditions.The results showed similar phenotypic correlations over two seasons, contrasting in rainfall, in the world lentil collection. Similar genetic and phenotypic correlations were also shown by the smaller sample of germplasm over 10 environments. These results indicated low importance of covariance due to environmental and genotype-environment interaction effects. Seed yield was positively correlated with straw yield, indicating selection for either character will increase the other trait. The correlation between seed protein content and seed yield was small and negative, while the correlation of protein with straw yield was positive in sign. This suggests that the current ICARDA goals of selection for high seed and straw yield will not have a major correlated effect on seed protein content. There was a strong positive correlation between seed size and cooking time (r=0.96), therefore seed size can be used to predict cooking time.  相似文献   

SYNCHRONISM IN THE FLASHING OF FIREFLIES     

Gates FC 《Science (New York, N.Y.)》1917,46(1187):314-315

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UNIVERSITY AND EDUCATIONAL NOTES     

Gates FC 《Science (New York, N.Y.)》1926,64(1668):595-596

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