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  • 1
    Electronic Resource
    Electronic Resource
    Occurrence and distribution of acid-labile histone phosphates in regenerating rat liver (1974)
    s.l. : American Chemical Society
    Biochemistry 13 (1974), S. 3785-3789 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00715a026
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of protein kinases forming acid-labile histone phosphates in Walker-256 carcinosarcoma cell nuclei (1974)
    s.l. : American Chemical Society
    Biochemistry 13 (1974), S. 3780-3785 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00715a025
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: "Enhancement of low-temperature critical epitaxial thickness of Si(100) with ion beam sputtering'' [Appl. Phys. Lett. 62, 570 (1993)] (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 120-120 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110819
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  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of low-temperature critical epitaxial thickness of Si(100) with ion beam sputtering (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 570-572 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown Ar+ ion beam sputtered Si epitaxially on Si(100) at substrate temperatures, T, between 390 and 480 K. At 480 K and 0.65 nm/s deposition rate, epitaxy is sustained at 1 μm of film thickness. At lower T, we observed an abrupt transition to amorphous growth at a critical thickness, he, which exhibited an Arrhenius dependence on T, as has previously been observed in molecular beam epitaxy (MBE) [D. J. Eaglesham, H. J. Gossmann, and M. Cerullo, Phys. Rev. Lett. 65, 1227 (1990)]. Our slope, d(ln he)/d(1/T), was 3 times steeper than in MBE, resulting in much thicker he at the higher T. The steep slope shows that the high kinetic energy of the sputtered Si is not enhancing surface diffusion enough to overcome thermal surface diffusion. We propose instead that the arriving kinetic energy is preventing void formation and thereby decreasing the rate at which statistical surface roughness, Δh, increases with film thickness. In both deposition processes, we propose that the collapse of epitaxy occurs when Δh exceeds the thermal surface diffusion length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108884
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  • 5
    Electronic Resource
    Electronic Resource
    Pre-incubation of Bradyrhizobium japonicum with jasmonates accelerates nodulation and nitrogen fixation in soybean (Glycine max) at optimal and suboptimal root zone temperatures (2005)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Physiologia plantarum 125 (2005), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Jasmonic acid (JA) and methyl jasmonate, collectively known as jasmonates, are naturally occurring in plants; they are important signal molecules involved in induced disease resistance and mediate many physiological activities in plants. We studied the effect of JA and its methyl ester, methyl jasmonate (MeJA), on the induction of nod genes in Bradyrhizobium japonicum GG4 (USDA3) carrying a plasmid with a translational fusion between B. japonicum nodY and lacZ of Escherichia coli, and the expression activity was measured by β-galactosidase activity. Both JA and MeJA strongly induced the expression of nod genes. They have little or no deleterious effects on the growth of B. japonicum cells, while genistein (Gen) showed inhibitory effects. We further studied the effect of JA- and MeJA-induced B. japonicum on soybean nodulation and nitrogen fixation under optimal (25°C) and suboptimal (17°C) root zone temperature (RZT) conditions. B. japonicum cells were grown in liquid yeast extract mannitol media and induced with a range of Gen, JA, and MeJA concentrations, including a treatment control with no inducer added. Soybean seedlings were grown at 25 or 17°C RZT with a constant air temperature (25°C) and inoculated, at the vegetative cotyledonary stage, with various B. japonicum induction treatments. Addition of Gen or jasmonates to B. japonicum, prior to inoculation, enhanced nodulation, nitrogen fixation, and plant growth at suboptimal RZT conditions. A higher concentration of Gen was inhibitory at 25°C, while this same concentration was stimulatory at 17°C. Interestingly, pre-incubation of B. japonicum with JA and MeJA enhanced soybean nodulation and nitrogen fixation under both optimal and suboptimal RZTs. We show that jasmonates are thus a new class of signaling molecules in the B. japonicum-soybean symbiosis and that pre-induction of B. japonicum with jasmonates can be used to enhance soybean nodulation, nitrogen fixation, and early plant growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2005.00559.x
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  • 6
    Electronic Resource
    Electronic Resource
    Confined Microplot Size for Nitrogen-15 Uptake by Corn Plants in a Corn Intercrop System (1998)
    Springer
    Semigroup forum 90 (1998), S. 155-161 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: 15 N to a microplot within a larger plot can reduce the cost. The objective of this study was to assess microplot dimensions required to produce reliable 15N data and cropping system effects on corn 15N uptake under a regime of monocropped corn (Zea mays L.) and corn intercropped with annual Italian ryegrass (Lolium multiflorum Lam.). Nitrogen was applied to large plots (15 by 75 m) at 270 kg N ha-1 on a fine, silty, mixed, nonacid, frigid Typic Humaquept soil during the 1993 and 1994 growing seasons. Enriched N fertilizer was applied to 1.15- by 1-m2 confined microplots located in opposite halves of the large plot in each year of the study. Corn plants inside the confined microplots were sampled at 0.1, 0.3, and 0.5 m from the end borders of each microplot. In 1993, monocropping resulted in increases in leaf, stalk, and total dry matter production of 22, 41, and 30%, respectively, within microplots and relative to intercropped corn. There were no cropping system effects for these parameters in 1994. Monocropping increased atom % 15N enrichment in corn grain and stalks and increased fertilizer N recovery in all plant tissue compared with intercropping in both years. There were no differences in atom % 15N enrichment and fertilizer N recovery for plants harvested at the three sampling positions. These results suggest that a confined microplot with an area as small as 0.4 by 1.15 m can provide a reliable measure of fertilizer N recovery for corn plants in monocrop or intercrop systems. Any or all of the five plants within the microplot could be used to supply a reliable estimation of 15N recovery by corn plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 7
    Electronic Resource
    Electronic Resource
    A Sampling Method for Measurement of Large Root Systems with Scanner-Based Image Analysis (2000)
    Springer
    Semigroup forum 92 (2000), S. 621-627 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Zea mays L.) genotypes with contrasting root morphologies: leafy reduced stature (LRS), leafy normal stature (LNS), and Pioneer 3905 (P3905), a commercial hybrid. Root length was determined for 957 subsamples. Confidence intervals were generated by software using the bootstrap resampling approach for optimizing sample size. Confidence intervals for mean estimates of each sample size were defined by ordering the evaluation function values from the smallest to the largest in a set of 5000 iterations. The lower and upper bounds of confidence intervals were also calculated using the standard procedure. This system allowed collection of homogeneous subsamples. Calculations showed that ∼10% of total root volume should be analyzed for estimation of the entire root system to be accurate within 10%. Although unreplicated, these data suggest that maize genotypes with the leafy trait have greater root lengths (1.75 km for LRS, 2.37 km for LNS, and 0.49 km for conventional commercial hybrid P3905) and a greater proportion of fine roots than the nonleafy type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 8
    Electronic Resource
    Electronic Resource
    New Histone Kinases in Nuclei of Rat Tissues (1973)
    [s.l.] : Nature Publishing Group
    Nature 246 (1973), S. 103-104 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In examining nuclear extracts of Walker-256 carcinosarcoma for histone kinases we have found that such extracts supplemented with whole calf thymus histones and y-32P-ATP yield a ratio of acid-labile to acid-stable protein phosphates from 2 to 3.5, dependent on^H. Further, we have found that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/246103a0
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  • 9
    Electronic Resource
    Electronic Resource
    Endomycorrhizae in a newly cultivated acidic meadow: Effects of three years of barley cropping, tillage, lime, and phosphorus on root colonization and soil infectivity (1996)
    Springer
    Biology and fertility of soils 21 (1996), S. 160-165 
    Details
    ISSN: 1432-0789
    Keywords: Key words Hordeum vulgare ; Agricultural ecosystem ; Acidic soil ; Soil infectivity ; Endomycorrhizae ; Reduced tillage ; Rhizosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The dynamics of mycorrhizae under disturbance created by crop production is not well understood. A 3-year experiment was undertaken on a nutrient-poor and acidic land that had last been cultivated in the early 1970s. We observed the effects of cropping spring barley (Hordeum vulgare L.) under four P-fertilizer levels and four levels of lime, in a minimum (rototillage), a reduced (chisel), or a conventional tillage system, on the mycorrhizal receptiveness of the host (maximum level of mycorrhizal colonization, as measured at harvest) and soil infectivity most probable number method. The host receptiveness decreased with time, while crop yields and soil infectivity increased simultaneously with time. Liming increased mycorrhizal colonization of barley roots and soil infectivity. P additions decreased root colonization but did not significantly affect the most probable number values. Slightly higher soil infectivity estimates were found under reduced tillage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335928
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  • 10
    Electronic Resource
    Electronic Resource
    Switchgrass Biomass and Chemical Composition for Biofuel in Eastern Canada (1999)
    Springer
    Semigroup forum 91 (1999), S. 696-701 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Panicum virgatum L.) is one of several warm-season grasses that have been identified as potential biomass crops in North America. A two-year field study was conducted, on a free-draining sandy clay loam (St. Bernard, Typic Hapludalf), to characterize the growth and evaluate changes in biomass accumulation and composition of switchgrass at Montreal, QC. Three cultivars, Cave-in-Rock, Pathfinder, and Sunburst, were grown in solid stands in a randomized complete block design. Canopy height, dry matter (DM) accumulation and chemical composition were monitored biweekly throughout the growing season. Average maximum canopy heights were 192.5 cm for Cave-in-Rock, 169.9 for Pathfinder, and 177.8 for Sunburst. The respective end-of-season DM yields were 12.2, 11.5, and 10.6 Mg ha-1. Biomass production among cultivars appeared to be related to time of maturation. Nitrogen concentration of DM decreased curvilinearly from 25 g kg-1 at the beginning of the season to 5 g kg-1 DM at season's end. Both acid-detergent fiber (ADF) and neutral-detergent fiber (NDF) concentrations increased to a maximum early in the season, after which no changes were detected. The average maximum values of ADF and NDF were, respectively, 647.6 and 849.0 g kg-1 DM for Cave-in-Rock, 669.1 and 865.2 for Pathfinder, and 661.8 and 860.9 for Sunburst. Changes in canopy height, DM accumulation, and chemical composition could all be described by predictive regression equations. These results indicate that switchgrass has potential as a biomass crop in a short-season environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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