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  • American Association for the Advancement of Science (AAAS)  (2,084)
  • Canadian Science Publishing
  • 1980-1984  (2,569)
  • 1955-1959
  • 1925-1929
  • 1984  (2,569)
Collection
Keywords
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  • 1980-1984  (2,569)
  • 1955-1959
  • 1925-1929
Year
  • 1
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    A new analytical model based on the −3/2 power rule of self-thinning (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-10-01
    Description: A nonlinear analytical model is developed to describe the relationship between average plant size (weight or volume) and stand density in single-aged, monospecific plant populations. The model gives estimates of the slope and intercept of the −3/2 power rule asymptote, the nature of the size–density trajectory, and such features as relative density at crown closure and the effects of soil type or site index. The model is tested by growing red alder (Alnusrubra Bong.) seedlings under greenhouse and lath house conditions at three initial spacings (8 × 8, 4 × 4, and 2 × 2 cm) and two soil types (river loam and alder forest soil) for 525 growth days. There are seven harvests, starting at crown closure. All size–density trajectories tend consistently towards the same single asymptote irrespective of initial spacing, soil type, or age. The asymptote slope and intercept are 1.46 and ca. 94 kg tree−1•m−2. The crown closure line is parallel to the asymptote at a relative density of 4.6 × 10−3. The model also adequately describes the size–density trajectories for 20–50-year-old red pines (Pinusresinosa Ait.) growing at six initial spacings. The asymptote slope and intercept are 1.6 and ca. 87 × 103 m3•tree−1•ha−1, respectively.
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    Electronic ISSN: 1208-6037
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  • 2
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    Winter injury to shoots as it affects root activity in black spruce container seedlings (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-02-01
    Description: Reduced levels of root activity were associated with winter injury to shoots of 1-year-old black spruce (Piceamariana (Mill.) B.S.P.) container seedlings.
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  • 3
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    A comparison of methods for total sulphur analysis of tree foliage (1984)
    Canadian Science Publishing
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    Publication Date: 1984-06-01
    Description: Three methods were compared for total sulphur analysis of tree foliage: magnesium nitrate ashing followed by turbidimetry, sodium hypobromite (NaOBr) oxidation followed by colorimetry, and an instrumental method using the Fisher S analyser, model 475. The latter method was found to be substantially better than the other methods with respect to accuracy and speed of analysis, and of satisfactory precision (average coefficient of variation (CV) was 2.5%). Dry ashing resulted in good precision (CV = 1.9%) but only recovered 76% of the reported total S in the United States National Bureau of Standards (NBS) orchard leaf standard. The NaOBr method recovered 88% of reported S from the NBS standard but showed poorer precision (CV = 4.5%). The Fisher analyser had the lowest operating cost per sample, largely owing to lower labour costs.
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  • 4
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    Effects of thinning and urea fertilization on the distribution of area increment along the boles of Douglas-fir at Shawnigan Lake, British Columbia (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-12-01
    Description: The effects of fertilization and thinning of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) on the distribution of area increment along the bole were assessed using radial growth measurements 6 and 9 years after treatment. Within treatments, the average area increment per tree was linearly related to diameter at breast height, and this relationship was used to evaluate the effects of treatment on growth rate. Fertilization had the greatest effect on average area increment, and for a particular fertilization regime, thinning increased the response. Thinning modified the distribution of growth over the bole of all trees and increased butt flare, especially in smaller trees. The effect declined from the 4- to 6-year measurement period to the 7-to 9-year measurement period. Fertilization had no consistent effect on growth distribution. The regression methods used in this study provided a more sensitive measure of form changes than previous methods, were independent of size distribution, and facilitated extrapolations and evaluation of temporal trend.
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  • 5
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    Organic matter and nitrogen content of the forest floor in even-aged northern hardwoods (1984)
    Canadian Science Publishing
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    Publication Date: 1984-12-01
    Description: Organic content of the forest floor decreases for several years after clear-cutting, and then slowly recovers. Thickness, bulk density, organic matter, and nitrogen content of forest floors were measured for 13 northern hardwood stands in the White Mountains of New Hampshire. Stands ranged from 1 to about 100 years in age. Forest-floor thickness varied significantly with stand age, but bulk density, organic fraction, and nitrogen fraction were independent of age. Total organic content of the forest floor agreed very well with data from Covington's (W. W. Covington 1981. Ecology, 62: 41–48) study of the same area. Both studies indicated that mature forest floors have about 80 Mg organic matter•ha−1 and 1.9 Mg nitrogen•ha−1. Within 10 or 15 years after cutting, the organic matter content of the floor decreases to 50 Mg•ha−1, and its nitrogen content to 1.1 Mg•ha−1. The question whether the decrease is rapid and the minimum broad and flat, or if the decrease is gradual and the minimum sharp, cannot be answered. The subsequent increase to levels reached in mature forest requires about 50 years. Some of the initial decrease in organic matter and nitrogen content of the forest floor may be caused by organic decomposition and nitrogen leaching, but mechanical and chemical mixing of floor into mineral soil, during and after the harvest operation, may also be important. The difference is vital with respect to maintenance of long-term productivity.
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  • 6
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    Ten-year growth and nutrition effects of a straw treatment and of repeated fertilization on jack pine (1984)
    Canadian Science Publishing
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    Publication Date: 1984-06-01
    Description: Straw was added over snow to smother ground vegetation (straw experiment) in sample plots in a 45-year-old jack pine (Pinusbanksiana Lamb.) stand in Quebec. Sample plots in the same stand were fertilized six times with N, P, and K in a 10-year period to maintain four foliar N regimes (optimum nutrition experiment). Smothering of ground vegetation with straw improved N nutrition and produced a sustained increase in tree growth. Sustained growth increases were obtained by repeated applications of 56 kg N/ha associated with 1.4% N foliar concentrations in current foliage. Gross volume increments of about 3 m3 • ha−1 • year−1 were sustained with these low applications. Repeated heavy N applications killed trees and reduced growth. Repeated additions of P and K with N did not produce appreciable differences in response from additions of N alone. Increment cores showed the annual development in growth as increasing over most of the 10-year period for low repeated N additions, and as increased and stable over the same period for the straw addition.
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  • 7
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    Application method and timing of gibberellin A4/7 treatments for increasing pollen conebud production in southern pines (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-02-01
    Description: In 4 different years' experiments with loblolly (Pinustaeda L.), slash (Pinuselliottiielliottii Engelm.), and longleaf (Pinuspalustris Mill.) pine, timing of gibberellin A4/7 (GA4/7) treatments was critical for optimal promotion of pollen conebuds. Two or three biweekly treatments given at strategic times were equivalent to six given from May to August. July to August applications best promoted pollen conebuds. Using the cationic surfactant Aromox C/12, aqueous foliar sprays of 200 mg/L of GA4/7 were more effective than ethanolic topical bud treatments for pollen conebud induction in slash pine. Addition of naphthaleneacetic acid enhanced the GA4/7 effect in loblolly pine but diminished it in slash and longleaf pine.
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  • 8
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    Root and shoot biomass and mycorrhizal development of white spruce seedlings naturally regenerating in interior Alaskan floodplain communities (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-08-01
    Description: Root and shoot biomass and mycorrhizal development were examined for white spruce (Piceaglauca (Moench) Voss) seedlings naturally regenerating in four floodplain communities in the boreal forest. Mean seedling biomass was highest in the open community and lowest in the spruce community. Seedlings growing in the open community had higher root:shoot ratios (0.50) compared with seedlings growing in the willow (0.34), alder (0.20), and spruce (0.24) communities. Essentially all short roots of spruce seedlings growing in all four communities were infected by mycorrhizal fungi throughout the growing season.
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  • 9
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    An evaluation of growth response of young, spaced balsam fir to 3 years of spruce budworm spraying with Bacillusthuringiensis (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-06-01
    Description: Growth response of young, spaced balsam fir (Abiesbalsamea (L.) Mill.) to 3 successive years (1979–1981) of treatment with Bacillusthuringiensis Berliner for spruce budworm (Choristoneurafumiferana (Clem.)) control was examined in 20 plots on the Cape Breton Highlands, Nova Scotia. Defoliation commenced in 1976, 3 years before control operations began. Five plots were established both inside and outside the spray block, in areas that had been severely defoliated by budworm and in areas moderately defoliated. All plots in the severely defoliated area suffered heavy tree mortality, but mortality was significantly lower in the protected plots. In contrast, the moderately defoliated plots suffered virtually no tree mortality. The average volume increment of stem-analyzed trees from 1979 to 1981 was 0.63 dm3/tree for protected and 0.43 dm3/tree for unprotected trees in the severely defoliated area versus 4.15 dm3/tree for protected and 3.08 dm3/tree for unprotected trees in the moderately defoliated area. These volume increment values are equivalent to 8.8 m3/ha of growth between 1979 and 1981 for protected plots in the moderately defoliated area, compared with 6.1 m3/ha for unprotected plots. Therefore, a total gain of 2.7 m3/ha can be attributed to the 3 years of B. thuringiensis spraying. Long-term growth responses toB. thuringiensis spraying were not evaluated. Better results would be expected had protection started at the beginning of the budworm outbreak, instead of after 3 years of severe defoliation.
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  • 10
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    Growth and acetylene reduction of black alder seedlings in response to water stress (1984)
    Canadian Science Publishing
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    Publication Date: 1984-08-01
    Description: Black alder, Alnusglutinosa (L.) Gaertn., seedlings were grown and kept well watered for 10 weeks, and then subjected to moisture stress conditioning for 5 subsequent weeks, where one-half of the seedlings were watered only when visibly wilted. The remaining seedlings (controls) were kept well watered. Moisture stress conditioning greatly reduced shoot, root, nodule, and total plant dry weight. The root–shoot ratio (grams/grams) of seedlings was significantly increased from 0.28 in the control seedlings to 0.33 in the water-stressed treatment. Acetylene reduction rates decreased only slightly in the range of water potentials between −0.50 and −1.29 MPa, then dropped rapidly below water potentials of −1.30 MPa. Moisture stress conditioning had no significant influence on this response. Although not significantly different, leaf and nodule osmotic potentials were consistently lower in the water-stressed plants.
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  • 11
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    Conducting sapwood area, foliage area, and permeability in mature trees of Piceasitchensis and Pinuscontorta (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-12-01
    Description: The relationships between foliage area and sapwood area between trees and within the crowns of 20 Piceasitchensis (Bong.) Carr., provenance Queen Charlotte Island, British Columbia (10 in a control plot and 10 in a plot fertilized with potassium and phosphorus 8 years before harvest) and 10 Pinuscontorta Dougl., provenance Ladysmith trees were examined using a physiological analysis based on Darcy's law. Foliage area index on the fertilized P. sitchensis plot was higher than on the control. The variation of foliage area density with depth in the canopies followed a normal distribution. Relationships between foliage area and sapwood basal area were linear but the slopes were different for the two species. There was no significant difference between the control and fertilized P. sitchensis trees. The relationship between foliage area and the product of sapwood area and permeability was linear and data from the three plots fell on the same line. Sapwood area, permeability, and their product decreased with depth through the crowns of the trees. Within the crowns, relationships between cumulative foliage area and sapwood area, and between cumulative foliage area and the product of sapwood area × permeability were different with species and treatment. A single linear relationship resulted when the product of cumulative foliage area above an internode × the internode length was plotted against sapwood area × permeability for the internode. This suggests that it is the drop in potential across a node and internode rather than the gradient of potential across the internode that is related to the flux of water through tree crowns. The data support the hypothesis that the relationship between foliage area and sapwood area depends on permeability of the sapwood and the local climate through its influence on transpiration rate, particularly via average water vapour pressure deficit of the air and stomatal conductance.
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  • 12
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    Effects of CO2 enrichment on growth of Liquidambarstyraciflua and Pinustaeda seedlings under different irradiance levels (1984)
    Canadian Science Publishing
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    Publication Date: 1984-06-01
    Description: Mathematical growth analysis techniques were used to assess the effects of atmospheric carbon dioxide enrichment on growth and biomass partitioning of Liquidambarstyraciflua L. (sweetgum) and Pinustaeda L. (loblolly pine) seedlings. Plants were grown from seed under high (1000 μmol•m−2•s−1) and low (250 μmol•m−2•s−1) photosynthetic photon flux density at CO2 concentrations of 350, 675, and 1000 μL•L−1 for 84 or 112–113 days. Elevated atmospheric CO2 concentration significantly increased height, leaf area, basal stem diameter, and total dry weight of sweetgum seedlings grown under high irradiance and to a lesser extent under low irradiance. Increases in dry matter accumulation were associated with early CO2 enhancement of net assimilation rate, but increases in amount of leaf surface area contributed more towards maintenance of larger size as seedlings aged. For sweetgum seedlings in particular, reduction of growth by low irradiance under normal atmospheric CO2 was compensated for by growing plants with elevated CO2. In contrast, elevated CO2 concentration produced no significant increase in growth of loblolly pine seedlings.
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  • 13
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    Stomatal conductance, transpiration, and resistance to water uptake in a Pinussylvestris spacing experiment (1984)
    Canadian Science Publishing
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    Publication Date: 1984-10-01
    Description: Stomatal conductance was measured with porometers in two plots of Pinussylvestris L. with markedly different tree spacings (plot 1, 608 stems ha−1; plot 2, 3281 stems ha−1), and hourly rates of transpiration were calculated using the Penman–Monteith equation at intervals throughout one growing season. Stomatal conductance varied little in relation to height or age of foliage. There was a linear decrease in canopy conductance with increasing water vapour pressure deficit of the air. Transpiration rates on both plots increased during the summer (maximum 0.3 mm h−1); rates on plot 1 were always lower (ca. 0.7 times) than on plot 2. Needle water potentials were similar throughout the season and only slightly lower on plot 1 than on plot 2. The mean hydraulic resistance of the trees on plot 1 was 2.4 times that on plot 2. The results support a hypothesis that considers the changes in transpiration rate, conducting cross-sectional area, canopy leaf area, water potential, and hydraulic resistance following thinning as a set of homeostatic relationships.
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  • 14
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    MINERALIZATION RATE CONSTANTS AND THEIR USE FOR ESTIMATING NITROGEN MINERALIZATION IN SOME CANADIAN PRAIRIE SOILS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-08-01
    Description: There is a need to provide quantitative relationships that will allow agronomists to estimate accurately the nitrogen-supplying power of soils while taking into account both temperature and soil moisture variations. The procedure for estimating net nitrogen mineralization proposed by Stanford and co-workers was used to determine Arrhenius relationships between the rate constants (k) and absolute temperature (°K) for 33 virgin and cultivated Western Canadian prairie surface (0–15 cm) soils. There was no significant difference in Arrhenius relationship between soils within each soil zone; thus, a single average Arrhenius equation was calculated per soil zone. Average Q10 for the Brown chernozemic soils was 2.75, for the Dark Brown, thin Black and thick Black chernozems, 2.18, and for the Gray luvisols, 2.0. These Q10 values are as high or higher than those reported in other parts of the world and may be related to the degree of degradation of the soil organic matter in these various soils. Culture had no marked effect on Q10 but sandy soils had higher Q10 than loams and clays. An equation for estimating net nitrogen mineralization for the Wood Mountain loam (a Brown chernozem) was tested using data from a previous study. The results were quite satisfactory, especially when the test data were derived under laboratory conditions where moisture was well controlled. The temperature functions presented herein can be used together with moisture functions and potentially mineralizable nitrogen results published earlier to make first estimates of net nitrogen mineralized during the growing season in the soils tested. Key words: Q10, Arrhenius relationship, potentially mineralizable nitrogen
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 15
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    POTASSIUM EXCHANGE CHARACTERISTICS IN RELATION TO MINERALOGICAL PROPERTIES AND POTASSIUM UPTAKE BY GRAPES OF SELECTED SOILS IN THE NIAGARA PENINSULA OF SOUTHERN ONTARIO (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-02-01
    Description: Potassium deficiency in grapes, as well as in other fruit crops grown on soils in the Niagara peninsula, is a common and often serious problem. Ap horizon samples from 12 of these soils and grape petiole samples from nine of the soil locations were analyzed to elucidate the behavior of the soil K and its availability to grapes. The soils ranged in texture from sandy loam to silty clay and their clay mineralogy was relatively uniform with mica as the main layer silicate. Vermiculite was quantified by potential K fixation methods and was concentrated in the clay. Up to 5.8% vermiculite was present in the soils which seemed to be sufficient to reduce K availability by K fixation. Amounts of exchangeable K extracted with NaCl or NH4Cl were relatively high (0.46–2.09 meq/100 g) but were not correlated with K uptake by grapes. Energies of K exchange obtained from immiscibly displaced soil solutions were closely related to vermiculite contents and amounts of K fixed after air drying. Energies of K exchange and ratios of exchangeable K over exchangeable Ca + Mg were highly correlated with K uptake by grapes. Soils with energies of K exchange less than or equal to −2800 cal/equiv. or K exch./(Ca + Mg) exch. equal to or more than 7% appeared to have adequate amounts of available K for grapes. These two analyses therefore show promise for predicting K availability to grapes. Key words: Exchangeability of K, energy of K exchange, fixation of K, soil mineralogy, availability of K to grapes
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 16
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    EFFECT OF CROPPING, SUMMERFALLOW AND FERTILIZER NITROGEN ON NITRATE-NITROGEN LOST BY LEACHING ON A BROWN CHERNOZEMIC LOAM (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: In 1982, six crop rotation treatments that were initiated in 1967 on a Orthic Brown Chernozemic loam were sampled for soil NO3-N and moisture to a depth of 240 cm. Soil samples were taken on 18 May and 10 June from all treatments, on 2 Sept. on fallow treatments only, and on 14 Oct. from cropped treatments. Precipitation during the sampling period was about 23% above the long-term average. It was estimated that at least 123 kg NO3-N∙ha−1 were leached from the top 240 cm of fallow soils. Leaching appeared to result from a portion of the precipitation moving through macro soil pores. There was evidence that water and NO3-N might also move upwards from below the 240-cm depth. Of the six rotations examined, the 2-yr and 3-yr spring wheat (Triticum aestivum L.) rotations lost the most NO3-N. The presence of fall rye (Secale cereale L.) in a fallow-rye-wheat rotation was very effective in reducing NO3-N losses. Spring wheat, when grown continuously, was also very effective in reducing NO3-N losses but even here there was some evidence of leaching beyond the root zone. Application of fertilizer N and P at amounts based on soil test recommendations reduced NO3-N leached. It was estimated from long-term precipitation data, that over the past 100 yr about 20% of the soil organic N that was present at the time of breaking the land has been lost from the soil via leaching. It was concluded that leaching losses of N from the soils on the Canadian prairies had been greatly underestimated and were partly responsible for losses attributed to the more visible wind erosion. Key words: Nitrate movement, crop rotations, fertilizer and leaching, summerfallow and leaching, bimodal leaching
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    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 17
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    THE EFFECT OF N AND P FERTILIZATION ON WINTER SURVIVAL OF WINTER WHEAT UNDER ZERO-TILLED AND CONVENTIONALLY TILLED MANAGEMENT (1984)
    Canadian Science Publishing
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    Publication Date: 1984-04-01
    Description: A preliminary field study was conducted to investigate the influence of fall applications of nitrogen and phosphorus on winter survival of winter wheat on zero-tilled and conventionally tilled land. Nitrogen fertilization tended to decrease winter survival while phosphorus fertilization tended to increase survival. A N-P interaction was observed, with the decrease in survival in response to added N being more evident in the absense of applied P. Balanced N-P fertilization may therefore result in highest winter survival in both conventionally tilled and zero-tilled winter wheat. Key words: Zero-tillage, winter survival, nitrogen, phosphorus, winter wheat
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 18
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    AVAILABILITY OF SUBSOIL SULPHATES TO BARLEY AND RAPESEED (1984)
    Canadian Science Publishing
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    Publication Date: 1984-08-01
    Description: Increased use of sulphur (S) fertilizers in southern Alberta led to a series of field and phytotron experiments to investigate the importance of S fertilizers and the role of subsoil reserves of sulphate sulphur (SO4-S) for barley (Hordeum vulgare) and rapeseed (Brassica napus). Two types of experiments were conducted. In the field-plot studies, barley was grown on dryland soils low in surface SO4-S but underlain by subsoil high in SO4-S. Neither elemental nor SO4 forms of S significantly increased barley yields in a series of 10 experiments on those soils. The comparisons were made at three levels of N fertilizers. In a series of lysimeter studies, three successive crops were grown in soil low in inorganic S (2.0 μg SO4-S∙g−1), or soil supplemented with 25 μg 35SO4-S∙g−1 soil at specified depths in the lysimeters. Barley was adequately supplied with S from SO4-S at a depth of 54–72 cm. It obtained 55% of its S from a high SO4-S (25 μg∙g−1) layer of soil at that depth, although 40 days growth were required before the S was effectively utilized. Five times as much S was taken up by the barley when the entire soil received an additional 25 μg SO4-S∙g−1 as when only the 54- to 72-cm depth was supplemented; however, the yields were unaffected. Most of the excess S was retained in the straw. Rapeseed took up an increasing amount of SO4-S as the proportion of the lysimeters that initially contained SO4-S was increased. Rapeseed was also able to utilize SO4-S from a depth of 54–72 cm. Rapeseed showed deficiency symptoms when most of the added and soil reserves of S had been depleted by previous crops; its growth habit became indeterminate and seeds did not develop. Although total dry matter yield was not greatly affected, seed yield was markedly reduced in S-deficient rapeseed. Rapeseed took up 10 times as much S as did barley when the S supply was just adequate for seed production. Although rapeseed had a much higher S requirement than barley, both crops were adequately supplied by subsoil reserves of SO4-S under the field and controlled environment conditions studied. The studies suggest that fertilizer recommendations should be based on soil analysis to a depth of at least 60 cm. Key words: Sulphur fertilizer, sulphates, 35S, barley, rapeseed, nutrient uptake
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    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 19
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    EFFECTS OF SOIL TEMPERATURE ON PHOSPHORUS EXTRACTABILITY. I. EXTRACTIONS AND PLANT UPTAKE OF SOIL AND FERTILIZER PHOSPHORUS (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-04-01
    Description: The effect of 10, 15, 20 and 25 °C soil temperatures on the extractability of soil and fertilizer phosphorus (P) was examined in two soils, one containing free carbonate (pH 7.8) and the other non-carbonated (pH 6.9). The time course of fixation and desorption reactions were monitored. The extractability of P was also assessed using sodium bicarbonate (NaHCO3) extractions, desorption curves, and short-term uptake by wheat seedlings. Phosphorus-32 was used throughout. Opposing effects of temperature were found. An increase in incubation temperature from 10 to 25 °C decreased the amount of applied P extracted probably due to accelerated fixation reactions. This effect was established 1 day after the P was applied and persisted for 57 days. An increase in extraction temperature over the corresponding incubation temperature increased the extractability of P, indicating endothermic desorption reactions. This effect was established 1 h after the extraction began and persisted for 48 h. Hence, the net effect of temperature on the extractability of P will depend upon the balance of these opposing processes. The time course of these processes had two phases. The effects of temperature were established during the initial phase (
    Print ISSN: 0008-4271
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  • 20
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    CROP UTILIZATION OF PLACED AND BROADCAST 15N-UREA FERTILIZER UNDER ZERO AND CONVENTIONAL TILLAGE (1984)
    Canadian Science Publishing
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    Publication Date: 1984-11-01
    Description: Growth chamber and field studies were conducted to assess the relative utilization of placed and broadcast 15N-urea by spring wheat. The field studies were conducted on zero and conventional (shallow) tillage systems, of 4-yr duration, located on Chernozemic soils at two locations in Saskatchewan. Placement below the seeding depth in comparison to broadcast application, generally reduced fertilizer N immobilization and increased fertilizer N uptake, recovery, and efficiency. Under moisture stress, placed applications were effective in enhancing dry matter yield and total N uptake. It is concluded that fertilizer N placement for these two contrasting tillage systems should be identical, thus some soil disturbance under zero tillage may be necessary to achieve optimum crop use of applied fertilizer N. The dominant N transformation processes and possible tillage induced differences, in regard to methods of N application, are discussed. Key words: Placed and broadcast N application, N efficiency, N utilization, 15N-urea, zero tillage, soil moisture
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  • 21
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    THE FOREST FLOOR: LATERAL VARIABILITY AS REVEALED BY SYSTEMATIC SAMPLING (1984)
    Canadian Science Publishing
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    Publication Date: 1984-08-01
    Description: The forest floor of a mature, naturally regenerated conifer stand on a well-drained podzolic soil in the Central Uplands of New Brunswick was sampled systematically. The forest-floor properties measured were: oven-dried mass per unit area, depth, moisture content, pH, potassium-chloride-extractable NH4-N and NO3-N, water-soluble phosphate, and ammonium-acetate-extractable K, Mg, and Ca. Total elemental C, N, P, K, Mg, Ca, Al, Fe concentrations were also determined. Coefficients of variation varied from 0.066 (total C) to 1.78 (2 N KCl-extractable NO3-N). Concentrations (measured in ppm or percent) were in each case less variable than absolute amounts (measured in kilograms per hectare). Frequency distributions were positively skewed (except for total C and N) and appeared to follow a gamma or Weibull distribution pattern. Key words: Ferro-Humic-Podzol, forest floor, lateral variability, spruce-fir forest, systematic sampling
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  • 22
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    A MORPHOMETRIC SYSTEM FOR DESCRIBING THE MICROMORPHOLOGY OF ORGANIC SOILS AND ORGANIC LAYERS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-11-01
    Description: A descriptive system is outlined for characterizing, in thin sections, the micromorphology of organic soils and organic layers. In each thin section, distinct regions of morphology, fabric zones, can be recognized. Each fabric zone may be composed of various combinations of organic constituents. These constituents are designated as basic morphologic units and four main types are defined: particulate material, granular units, discrete compound particles, and massive-appearing fabric. The fabric zone and basic morphologic units can be coded in a fabric description symbol of the following simple general form [Fabric Unit]1 …[Fabric Unit]n, where [Fabric Unit] represents a particular fabric zone and its basic morphologic units. For example, [PpGa] [Ma] is a fabric description symbol indicating that two fabric zones are identified in the thin section. The first [PpBa] is the dominant fabric zone in the thin section (areal proportion) and is composed of two basic morphologic units, mainly recognizable plant fragments, Pp, and a lesser occurrence of amorphous granular material, Ga. The second fabric unit [Ma] indicates a fabric zone composed of one basic morphologic unit: amorphous massive-appearing fabric, Ma. The system is applied to the micromorphological characterization of a Typic Mesisol from Keswick, Ontario. Key words: Microcorphology, organic soils, descriptive method, characterization
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  • 23
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    NITROUS OXIDE EMISSIONS FROM SOILS DURING THAWING (1984)
    Canadian Science Publishing
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    Publication Date: 1984-04-01
    Description: We, as well as others, have observed that nitrous oxide (N2O) fluxes increased markedly during soil thaw in early spring. This phenomenon was examined further by determining nitrous oxide concentrations in the soil profile and N2O fluxes from the soil surface during the winter-spring period and evaluating physical release and microbial production of N2O on thawing of frozen soil cores in the laboratory. In mid-winter, soil profile N2O concentrations were close to ambient and surface N2O fluxes were low. At thawing, high N2O concentrations (ranging from 1082 to 2066 mg∙m−3) were found at 10–30 cm in the soil profiles of a coniferous forest, and in manure- and straw-treated plots. Concurrently, N2O flux increased markedly and reached some of the highest values observed during the entire season. When thawing was complete, soil profile N2O concentrations and N2O flux declined. Soil cores were taken from frozen soil, warmed in the laboratory, and N2O release measured. Nitrous oxide was released on warming, and cores treated with CHCl3 had a slower release rate. The results indicate that some of the N2O flux occurring at thawing is due in part to physical release of N2O, and that additional N2O is likely produced by denitrification. Key words: Nitrous oxide, denitrification, frozen soils, nitrogen loss
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  • 24
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    EFFET DE LA FERTILISATION PHOSPHATEE SUR LA POMME DE TERRE EN RELATION AVEC L’ANALYSE DU SOL ET LA SOURCE DE PHOSPHORE UTILISEE (1984)
    Canadian Science Publishing
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    Publication Date: 1984-08-01
    Description: The effect of phosphorus fertilization on potato yields (Solanum tuberosum L.) was studied on 24 experimental sites varying from 44 to 1000 kg/ha of soil test P. The respective relative yields (yield with P fertilizer/maximum yield with P fertilizer x 100) varied from 20.3 to 100%. The Mitscherlich equation was used to relate relative yields to soil test P. According to their soil test value, the soils were partitioned in three classes by the Cate-Nelson method to establish poor (300 kg/ha of available P or less), medium (301–400 kg/ha P) and rich 401 kg/ha P or more) soil fertility classes. It was found that 94 kg/ha fertilizer P was necessary for maximum yields with an increase of 10% or greater on poor soils. On medium and rich soils, the requirement was 50 kg P/ha for a yield increase of 1–10%. Below a 1% increase, the P application should be lowered. At high rates diammonium phosphate (DAP) has been found to give tuber yield equal to those of superphosphates. On the other hand, at low rates, DAP application was more effective. DAP induced a higher mid-season P concentration in the petiole tissue Acidification by superphosphates increased aluminum, iron and manganese availability in the soil and reduced P solubility in the band area, in contrast to DAP. Key words: Potato, soil test phosphorus, source of phosphorus fertilizer, phosphorus fertilization, superphosphate, ammonium phosphate
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  • 25
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    EFFECTS OF SOIL TEMPERATURE ON PHOSPHORUS EXTRACTABILITY. II. SOIL PHOSPHORUS IN SIX CARBONATED AND SIX NON-CARBONATED SOILS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-04-01
    Description: The change in the extractability of soil phosphorus (P) in response to temperature was examined in 12 Manitoba soils. These soils varied in carbonate and P contents. The soil P was labelled with 32P to facilitate measurements. Sodium bicarbonate extractions, anion exchange resin extractions, P desorption curves and short-term plant uptake using wheat were used to measure P extractability. An increase in soil temperature increased the extractability of P. This was apparent for P extracted by NaHCO3 only in soils low in P. The P extracted by resin appeared to respond similarly but was quite variable. Effects of temperature on the desorption curve parameters were significant only in soils high in P. The latter may reflect the detection limits for P using the desorption curve extraction system. Plant uptake was closely correlated to root growth. Both increased markedly as temperature increased. However, in certain soils the increase in P uptake due to temperature was far greater than the corresponding increase in root growth. The estimates of the labile pool accessed by plants increased as temperature increased. The principle hypothesis, that the effect of temperature on P extractability changed from soil to soil, was confirmed. The only controlling soil factor that could be identified was the basic soil P content. Key words: Temperature, soil phosphorus, carbonated, non-carbonated, plant uptake, wheat
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  • 26
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    THE NECESSITY OF WASHING FILBERT LEAVES FOR MACRO- AND MICRONUTRIENT CONSIDERATIONS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: Differences between analyses of washed and unwashed filbert leaves were found for N, P, Mg, S, B, Mn, Zn and Cu but not for K and Ca. The contamination was attributed primarily to particulates since washing reduced average leaf weight measurements. The magnitude of the contamination varied among orchards and between years. It was concluded that washing leaves is essential for both micro- and macronutrient considerations. Key words: Filberts, leaf washing, macronutrients, micronutrients, contamination
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    CORRECTION (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
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  • 28
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    ACKNOWLEDGMENT OF REVIEWERS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: not available
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  • 29
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    SOIL AND SOLUTION pH AND SODIUM:CALCIUM RATIO: EFFECTS ON CATION EXCHANGE PROPERTIES OF A SODIUM-SATURATED CHERNOZEMIC SOIL (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: The effects of soil and solution pH and Na:Ca ratio in solution on the exchangeable Na, Ca, and (Na + Ca) of a Na-saturated Dark Brown Chernozemic soil were studied. At soil pH 9.0, the exchangeable Na, Ca, and (Na + Ca) were 14.5, 25.4, and 21.8% greater than at soil pH 6.0. Solution pH (6.0–9.0) had small but statistically significant effects on the amount of Na and Ca adsorbed by the soil. The logarithm of exchangeable sodium percentage (ESP) was related to the Na fraction in the solution by a polynomial equation, log ESP = 0.93 [Na/(Na + Ca)]2 + 0.16 [Na/(Na + Ca)] + 0.82. Not only is replacement of exchangeable Na with Ca important in the reclamation of this soil, should it become sodic and have a high pH, but also lowering of its surface charge, through lowering of its pH, would be an important factor in its reclamation. It appears impractical to reduce soil pH by applying acidified irrigation water. Acidic amendments such as gypsum and sulfur may be more suitable. Key words: Cation exchange, solution pH, soil pH
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    MINERALOGY OF SURFACE SOIL SAMPLES OF SOME QUEBEC SOILS WITH REFERENCE TO K STATUS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: Surface samples of five Quebec soils (St. Bernard, Ormstown, Howick, Dalhousie and Bearbrook) were selected to represent typical agricultural soils with a range of parent material. Soil minerals were fractionated by size into five separates and examined using X-ray diffraction (XRD) techniques and chemical analyses. In nearly all cases the non-clay separates (250–2.0 μm) contained feldspars, amphiboles and quartz as dominant minerals with only small amounts of layer silicates. Feldspars, amphiboles and quartz were also relatively abundant in the clay separates. The layer silicates in the clay separates consisted mainly of mica, chlorite and vermiculite. The soils had similar mineral suites, considered indicative of a low degree of weathering. Considering the mineral composition and the low degree of weathering, it is proposed that primary K-bearing minerals, including K-feldspars, are important sources of K in these soils. Key words: K release, particle size, soil mineralogy
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  • 31
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    DERIVATION OF NUTRIENT REQUIREMENTS OF FILBERTS USING ORCHARD SURVEYS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: Leaf tissue nutrient concentrations measured over 3 years in 17 filbert orchards showed consistent correlations between N/S, Cu/S, Zn/Cu, Ca/K, Mg/K and Mg/Ca. Optimum concentrations of 1.44% Ca, 0.27% Mg, 0.14% S, 8.8 ppm Cu, and 19.5 ppm Zn were calculated using regression equations of the various correlations and optimum values of N and K (2.2% N and 0.8% K) reported in the literature. Correlations between leaf and soil nutrient concentrations were observed but they were not consistent over the 2 years and all depths (0–15, 15–30, 30–60 cm) of soil samples taken. Average leaf weight measurements were sufficiently consistent within orchards to allow detection of orchard to orchard differences. Several nutrients appeared to affect or be affected by average leaf weight. Average leaf weights appear to have potential as a biologically important measurement but the significance has yet to be derived. Key words: Filberts, macronutrients, micronutrients, optimum leaf concentrations, leaf weights
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  • 32
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    INFLUENCE OF TREE WINDTHROW ON THE PROPERTIES AND CLASSIFICATION OF SELECTED FORESTED SOILS FROM NOVA SCOTIA (1984)
    Canadian Science Publishing
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    Publication Date: 1984-04-01
    Description: Soils affected by tree-throw (arbroturbation) at three sites in Nova Scotia varied in development and microrelief characteristics. Soil horizonation was strongly developed and continuous through the mound-and-pit sequence at one site but was intermittent and irregular at the other two sites. Analytical data, particularly those for oxalate- and pyrophosphate-extractable Fe and Al reflected the morphological variations observed in the pedons. Classification of the arbroturbated soils according to the Canadian system is not a problem though it is necessary to indicate turbation by appending a phase to the soil class name at levels above the series. Mapping areas of such soils involves no change from regular procedures except in the description of the soil units. Hummocky microrelief due to arbroturbation presents some limitations in the use of land. Key words: Physical disturbance, classification, mapping, land use
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    LAND DISPOSAL OF MANURE IN THE PROVINCE OF QUEBEC (1984)
    Canadian Science Publishing
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    Publication Date: 1984-02-01
    Description: The 1981 Census of Agriculture statistics was used to estimate manure production from livestock activities in Quebec. Only 10 of the subdivisions (1%) were found to have an improved farmland base that was inadequate to meet the total manure stocking rate (TMSR) regulation (i.e. 0.3 ha per animal unit (AU) of production). There were two areas, one near Granby in the Yamaska River basin and another near the outlet of the Chaudiere River, where there was a substantial number of adjoining subdivisions with TMSRs above 2.0 AU∙ha−1. Analysis of soil survey data indicated a greater potential for groundwater contamination in the Chaudiere than in the Yamaska high-density subdivisions. However, about 15% of animal manure production in Quebec was on farms which did not meet the land base requirement. Hog waste constituted about 83% and poultry waste 13% of the manure produced on farms with inadequate improved land. Key words: Water pollution, animal waste, non-point sources, manure applications
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    EVALUATION OF SOME FIELD TESTS FOR PODZOLIC B HORIZONS (1984)
    Canadian Science Publishing
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    Publication Date: 1984-11-01
    Description: The potential of several field tests for differentiating podzolic B horizons from others was studied. The spodic horizon test involved determinations of 4 N KOH-extractable Al and the color of humic extracts. The 0.5% HCl-HF test and the acid oxalate test both involved a rating of the intensity of color of the extracts. For the samples tested, the HCl-HF test was the most promising on the basis of less dependence on correct sample weight, simplicity, and the best differentiation of the podzolic B horizons tested. For samples having borderline properties, however, such field tests might yield ambiguous results because sample weights and estimates of extract colors are not accurate. In most circumstances, sampling for laboratory analyses is recommended to resolve classification problems. Key words: Field test, podzolic B horizon, spodic horizon
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-12-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Dec 14;226(4680):1297.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17832620" target="_blank"〉PubMed〈/a〉
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-12-21
    Description: In the report "Growth inhibitor from BSC-1 cells closely related to platelet type beta transforming growth factor" by Ronald F. Tucker et al. (9 Nov., p. 705), figures 1 and 2 on page 706 were incorrectly interchanged. The figure captions are correct.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Dec 21;226(4681):1377.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17788978" target="_blank"〉PubMed〈/a〉
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    AAAS Annual Meeting Los Angeles 26-31 May 1985 (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-11-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Nov 16;226(4676):824.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17759885" target="_blank"〉PubMed〈/a〉
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  • 38
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    Obituaries (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-11-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Nov 2;226(4674):531.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17821504" target="_blank"〉PubMed〈/a〉
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  • 39
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    Report on talent pool for science and engineering published (1984)
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    Publication Date: 1984-11-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Nov 2;226(4674):531.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17821506" target="_blank"〉PubMed〈/a〉
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  • 40
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-10-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 19;226(4672):325.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17749876" target="_blank"〉PubMed〈/a〉
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    SWARM Division Annual Meeting to Be in Tucson (1984)
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    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):160.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814341" target="_blank"〉PubMed〈/a〉
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  • 42
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-10-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 26;226(4673):421.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17799922" target="_blank"〉PubMed〈/a〉
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    New york science seminar series for teachers begins this month (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-11-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Nov 2;226(4674):531.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17821505" target="_blank"〉PubMed〈/a〉
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    Science 84 book explains science of sports (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):160.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814340" target="_blank"〉PubMed〈/a〉
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  • 45
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-26
    Description: In two Research News articles by Arthur L. Robinson (24 Aug., p. 822; 14 Sept., p. 1137), the affiliations of three researchers were given incorrectly. Peter Smith and Thirumalai Venkatesan (24 Aug.) are with Bell Communications Research (Bellcore), not AT&T Bell Laboratories, as stated. David Hwang (14 Sept.) is also with Bellcore.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 26;226(4673):393.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17799916" target="_blank"〉PubMed〈/a〉
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  • 46
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-19
    Description: In the last paragraph of Arthur L. Robinson's Research News article "High spatial resolution ion microprobe" (14 Sept., p. 1137), J. Ronald Hass' name was misspelled.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 19;226(4672):242.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17749866" target="_blank"〉PubMed〈/a〉
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  • 47
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    "Report on science" honored (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):159.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814336" target="_blank"〉PubMed〈/a〉
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  • 48
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    Arid lands conference issues call for papers (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):160.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814339" target="_blank"〉PubMed〈/a〉
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  • 49
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-05
    Description: As published, figure 2 in the report "Disruption of the terrestrial plant ecosystem at the Cretaceous-Tertiary boundary, western interior" by R. H. Tschudy et al. (7 Sept., p. 1030) contained two errors. The break in the stratigraphic column should have been 3 m, and the iridium concentration should have been in parts per trillion. The correct figure is reproduced below. [see figure in source PDF].〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 5;226(4670):7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17815399" target="_blank"〉PubMed〈/a〉
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  • 50
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    Lecture describes use of genetics to establish grandpaternity (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-09-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Sep 7;225(4666):1013.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783038" target="_blank"〉PubMed〈/a〉
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  • 51
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: In the report "A candidate magnetic sense organ in the yellowfin tuna, Thunnus albacares" by M. M. Walker et al. (18 May, p. 751), the standard error given on page 752 (3rd column, first full paragraph) for the sizes of the magnetite particles was instead the standard deviation. Use of the term "standard error" implies a far greater variance in the sizes of the particles than actually existed and could lead to the conclusion that the published electron micrograph is not typical but presents a biased sample of the particles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):116.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814319" target="_blank"〉PubMed〈/a〉
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  • 52
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    Scientific freedom and responsibility award: call for nominations (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-09-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Sep 7;225(4666):1013.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783037" target="_blank"〉PubMed〈/a〉
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  • 53
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    AAAS Annual Meeting Los Angeles 26-31 May 1985 (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):158.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814335" target="_blank"〉PubMed〈/a〉
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  • 54
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    List of Women's Science Groups Available (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Oct 12;226(4671):160.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17814338" target="_blank"〉PubMed〈/a〉
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  • 55
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-09-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Sep 7;225(4666):1005.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783029" target="_blank"〉PubMed〈/a〉
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  • 56
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    Koshland named science editor (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 17;225(4663):695.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17810278" target="_blank"〉PubMed〈/a〉
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  • 57
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    Bacterial contamination of human tumor samples (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 17;225(4663):670-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6087452" target="_blank"〉PubMed〈/a〉
    Keywords: Carcinoma, Hepatocellular/genetics ; Cell Line ; DNA, Bacterial ; *DNA, Neoplasm ; DNA, Viral ; Hepatitis B virus/genetics ; Humans ; Liver Neoplasms/genetics ; Oncogenes
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  • 58
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    Criteria for evidence of chemical carcinogenicity. Interdisciplinary Panel on Carcinogenicity (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-17
    Description: The Interdisciplinary Panel on Carcinogenicity reviewed and reevaluated criteria for assessing evidence of carcinogenicity of chemical substances. The panel reviewed criteria applicable to data derived from human epidemiological studies and from both in vivo and in vitro laboratory studies. A critical appraisal of all these sources of information led to the conclusion that the characterization of human risk always requires interdisciplinary evaluation of the entire array of data on a case-by-case basis. Animal studies, whenever possible, should be augmented by studies of mechanisms, metabolism, and pharmacodynamics. Such studies may assist in assessing risk to man. Recognizing the utility of such data should point the way for better assessment in the future.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 17;225(4663):682-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6463646" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Assay ; *Carcinogens/metabolism/pharmacology ; Carcinogens, Environmental ; Cell Transformation, Neoplastic ; Dose-Response Relationship, Drug ; Environmental Exposure ; Epidemiologic Methods ; Humans ; In Vitro Techniques ; Mixed Function Oxygenases/metabolism ; Mutagenicity Tests ; Neoplasms/chemically induced ; Risk ; Time Factors ; United States
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  • 59
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    1983 aaas summary financial statements (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 3;225(4661):498.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17750843" target="_blank"〉PubMed〈/a〉
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  • 60
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    To members in the biological sciences (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 3;225(4661):497.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17750841" target="_blank"〉PubMed〈/a〉
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  • 61
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    Reprints of books previously reviewed (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 17;225(4663):710.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17810289" target="_blank"〉PubMed〈/a〉
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  • 62
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    Products and materials (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-09-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Sep 21;225(4668):1386.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17732948" target="_blank"〉PubMed〈/a〉
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  • 63
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    Renewable resource planning reference published (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 3;225(4661):497.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17750840" target="_blank"〉PubMed〈/a〉
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  • 64
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-08-10
    Description: In the article "NIMH faces renewed uncertainties" by Jeffrey L. Fox (News and Comment, 13 July, p. 148), the first sentence of the first full paragraph of column 2 on page 149 was incorrectly printed. The sentence should have begun, "The 1985 budget for research calls for a modest increase...."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 10;225(4662):568.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17729829" target="_blank"〉PubMed〈/a〉
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  • 65
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-07-20
    Description: In the credit for the photograph on page 1086 of the issue of 8 June accompanying the Research News article "Crystal anisotropy directs solidification" by Arthur L. Robinson (p. 1085), Kurt Nassau's affiliation is incorrectly given as Western Electric. Nassau is at AT&T Bell Laboratories, Murray Hill, New Jersey.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jul 20;225(4659):268.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17749539" target="_blank"〉PubMed〈/a〉
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  • 66
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    Obituaries (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 3;225(4661):497-541.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17750839" target="_blank"〉PubMed〈/a〉
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  • 67
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    Help AAAS Membership Office Stop Repetition (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-09-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Sep 7;225(4666):1013.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783036" target="_blank"〉PubMed〈/a〉
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  • 68
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    Robert v. Ormes 1921-1984 (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-07-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jul 6;225(4657):44.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775654" target="_blank"〉PubMed〈/a〉
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  • 69
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Aug 24;225(4664):817.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17801142" target="_blank"〉PubMed〈/a〉
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  • 70
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-06-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 15;224(4654):1222.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17819484" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 71
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    COSEPP Study Under Way (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-06-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 1;224(4652):1021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17732001" target="_blank"〉PubMed〈/a〉
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  • 72
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    Truman and science (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-06-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 1;224(4652):980.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17731990" target="_blank"〉PubMed〈/a〉
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  • 73
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    New data guide available (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-06-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 1;224(4652):980-1021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17731989" target="_blank"〉PubMed〈/a〉
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  • 74
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-06-01
    Description: In Table 1 of the report "Monoclonal antibody to Thy-1 enhances regeneration of processes by rat retinal ganglion cells in culture" by D. Leifer et al. (20 Apr., p. 303), the unit of measurement, micrometers, was omitted in the third column, "Mean length of processes per cell."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 1;224(4652):934.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17731973" target="_blank"〉PubMed〈/a〉
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  • 75
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    NAS Elects New Members (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 25;224(4651):856.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17743186" target="_blank"〉PubMed〈/a〉
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  • 76
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    Cancer and diet (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 18;224(4650):658,660,662 passim.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6719107" target="_blank"〉PubMed〈/a〉
    Keywords: Carcinogens/pharmacology ; Diet/*adverse effects ; Female ; Humans ; Male ; Neoplasms/*etiology
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  • 77
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    Insurance administrator address change (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):525.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753780" target="_blank"〉PubMed〈/a〉
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  • 78
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    Obituaries (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):525.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753779" target="_blank"〉PubMed〈/a〉
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  • 79
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    AAAS Science Photography Contest (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):483.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753766" target="_blank"〉PubMed〈/a〉
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  • 80
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    Annual meeting comes to the big apple (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):482.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753765" target="_blank"〉PubMed〈/a〉
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  • 81
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    Reminder: pacific division to meet in san francisco (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):482.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753764" target="_blank"〉PubMed〈/a〉
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  • 82
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    Comings and goings (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):473.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753758" target="_blank"〉PubMed〈/a〉
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  • 83
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-27
    Description: On page 1426 of the report "Association of parvoviruses with rheumatoid arthritis of humans" by R. W. Simpson et al. (30 Mar., p. 1425), a portion of the text beginning on line 18 of the first full paragraph in column 3 was incorrectly printed. It should have read, "We were unable to detect 24-nm particles in brains of normal mice from our colony or mice intracerebrally inoculated with extracts of synovial cells from patients with noninflammatory degenerative joint disease (DJD). More conclusive evidence for the identity of RA-1 as a parvovirus comes from our recent success in demonstrating that CsCl gradient fractions containing the infectious 24-nm particles can be extracted for a single-stranded DNA which is approximately 4.5 kilobases in size."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 27;224(4647):340.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17741201" target="_blank"〉PubMed〈/a〉
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  • 84
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    Theme of arctic science conference is "science and public policy" (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-07-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jul 6;225(4657):44.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775652" target="_blank"〉PubMed〈/a〉
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  • 85
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    Vitamin A and cancer (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 27;224(4647):338-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6710146" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; Neoplasms/*prevention & control ; Vitamin A/*therapeutic use
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  • 86
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    Pressure for patent reform (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 13;224(4645):137.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17744669" target="_blank"〉PubMed〈/a〉
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  • 87
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    NAE Elects New Members (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 May 4;224(4648):470.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17753756" target="_blank"〉PubMed〈/a〉
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  • 88
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-06-29
    Description: The price of $55 given for Island Biogeography in the Sea of Cortez (T. J. Case and M. L. Cody, Eds.) in the review of the book that appeared in the issue of 18 May, p. 736, and in some announcements distributed by the publisher, is incorrect. The price of the book is $45.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 29;224(4656):1384.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17793358" target="_blank"〉PubMed〈/a〉
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  • 89
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    Association awards presented at annual meeting in new york city (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-07-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jul 6;225(4657):43-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775651" target="_blank"〉PubMed〈/a〉
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  • 90
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    Reprints of books previously reviewed (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-06-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jun 29;224(4656):1424.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17793379" target="_blank"〉PubMed〈/a〉
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  • 91
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    Amendment to AAAS Constitution (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 6;224(4644):49.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783515" target="_blank"〉PubMed〈/a〉
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  • 92
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    Black engineers (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 6;224(4644):48.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783512" target="_blank"〉PubMed〈/a〉
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  • 93
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    Botanical essays available (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-07-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Jul 6;225(4657):44.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775653" target="_blank"〉PubMed〈/a〉
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  • 94
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    AAAS Annual Meeting New York, 24-29 May 1984: The New York Hilton and the Sheraton Centre (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-03-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Mar 30;223(4643):1381-400.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17746046" target="_blank"〉PubMed〈/a〉
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  • 95
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    Products and materials (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-03-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Mar 23;223(4642):1318-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17759368" target="_blank"〉PubMed〈/a〉
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  • 96
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    Interciencia begins network of biotechnology in the americas (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 6;224(4644):49.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783514" target="_blank"〉PubMed〈/a〉
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  • 97
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1984-03-23
    Description: A line was inadvertantly omitted from the last sentence of George S. Mumford's letter of 20 January (p. 238). It should have read, "If, at an early stage, we could foster in this manner a feeling among our graduates of their indebtedness to the general public for directly or indirectly supporting their research and the right of that public to know the results, it might become traditional for them to proceed in such a way throughout a career."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Mar 23;223(4642):1248.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17759343" target="_blank"〉PubMed〈/a〉
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  • 98
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    Erratum (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-13
    Description: In the letter "Nuclear test yields" by Jack F. Evernden and Lynn R. Sykes (17 Feb., p. 642), the symbol for surface wave magnitudes was incorrectly given as m(b) in line 39 of the second column of page 644. The correct symbol is m(s).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 13;224(4645):110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17744656" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    Evolution/Creation book published (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Apr 6;224(4644):49.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17783516" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PRODUCTS and MATERIALS (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-03-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1984 Mar 9;223(4640):1094.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17830158" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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