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  • Coleoptera  (5)
  • Maize  (4)
  • Rat  (4)
  • Springer  (13)
  • Annual Reviews
  • National Academy of Sciences
  • Springer Science + Business Media
  • 1980-1984  (13)
  • 1980  (13)
Collection
Keywords
Publisher
  • Springer  (13)
  • Annual Reviews
  • National Academy of Sciences
  • Springer Science + Business Media
Years
  • 1980-1984  (13)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Enantiomer-based specificity in pheromone communication by two sympatricGnathoirichus species (Coleoptera: Scolytidae) (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 445-456 
    Details
    ISSN: 1573-1561
    Keywords: Gnathotrichus retusus ; G. sulcatus ; Coleoptera ; Scolytidae ; ambrosia beetle ; aggregation pheromone ; 6-methyl-5-hepten-2-ol ; sulcatol ; reproductive isolation ; enantiomers ; chiral compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The aggregation pheromone ofGnathotrichus retusus was isolated and identified as (S)-(+)-sulcatol (6-methyl-5-hepten-2-ol). In laboratory and field experiments,G. retusus responded to (S)-(+)-sulcatol, but not to (±)-sulcatol, which was attractive to the sympatric species,G. sulcatus. G. sulcatus did not respond to optically pure (S)-(+)-sulcatol, but began to respond when ⩾ 1% (R)-(−)-sulcatol was present in an enantiomeric mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402921
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating western pine beetle-caused tree mortality for evaluating an attractive pheromone treatment (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 853-866 
    Details
    ISSN: 1573-1561
    Keywords: Ponderosa pine mortality ; Dendroctonus brevicomis ; Coleoptera ; Scolytidae ; aerial photography ; detection ; estimation ; sampling ; mapping ; attractive pheromones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Sequential aerial photography was used to detect ponderosa pine trees killed by successive generations of the western pine beetle (WPB),Dendroctonus brevicomis Lec., over a three-year period during a study to evaluate the effectiveness of attractive pheromones for the suppression and survey of WPB. The total number of WPB-killed trees were estimated for each generation, using probability-proportional-to-size sampling procedures. Infested trees at the beginning of the suppression treatment totaled 283. Attacks by three successive WPB generations in 1970 killed 90,83, and 91 trees, respectively. The first generation in 1971 killed 47 trees and the two subsequent generations combined killed a total of 49 trees. During the suppression treatment, tree mortality was concentrated into the suppression plots in comparison to the check plots and the surrounding area. By 1972, tree mortality distribution returned to its original pattern, but at one-tenth the original level, as shown by maps. Recommendations suggest ways to improve the use of aerial photography for studies of WPB-caused tree mortality and population dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990469
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural alterations associated with the initiation of follicular atresia (1980)
    Springer
    Cell & tissue research 211 (1980), S. 105-115 
    Details
    ISSN: 1432-0878
    Keywords: Rat ; Preovulatory follicle ; Ultrastructure ; Degeneration ; Atresia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary To identify and describe ovarian follicles committed to undergo follicular degeneration (atresia), immature rats were primed with pregnant mare serum gonadotropin (PMSG). After PMSG treatment, preovulatory follicles develop but subsequently degenerate. Prior to the appearance of pyknotic nuclei (Stage I of atresia), degenerative changes were observed in focal areas of the granulosa cell layer. These changes include “blebbing” of the cytoplasm and alterations in the shape of the granulosa cells. The appearance of these degenerative changes coincides with a decrease in ovarian concentrations of estradiol and testosterone. Since estrogens and androgens maintain the follicle, the decline in estradiol and testosterone could be responsible for the further degenerative alterations that lead to complete deterioration of the preovulatory follicle. In Stage I atretic follicles, lysosome-derived autophagic vacuoles develop and macrophages invade both the thecal and granulosa cell layers. The combined actions of the autophagic vacuoles and macrophages could destroy both the granulosa-cell and thecal layers and thereby transform the preovulatory follicle into an ovarian cyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233727
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on the juxtaglomerular apparatus VI. Sympathetic innervation, catecholamines and the renin-angiotensin-system in rats and tree-shrews (Tupaia belangeri) (1980)
    Springer
    Cell & tissue research 212 (1980), S. 375-382 
    Details
    ISSN: 1432-0878
    Keywords: Juxtaglomerular apparatus ; Sympathetic innervation ; Renin-angiotensin system ; Electron microscopy ; Fluorescence microscopy ; Tupaia belangeri ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It has previously been reported that the primitive primate Tupaia belangeri develops a renal failure when exposed to psychosocial stress. In order to learn if this high susceptibility to stress of the Tupaia kidney can be correlated with morphological and functional parameters of the Juxtaglomerular apparatus (JGA) and the renin-angiotensin system, comparative experiments were performed on Tupaia and rat. Our results reveal an outstandingly high potency of the JGA and the renin-angiotensin system in Tupaia as evident from the following findings: The Tupaia JGA contains a great number of epithelioid cells abounding in renin granules (electron microscopy). The renin content of the Tupaia kidney is considerably higher than in the rat (radio-immunoassay). The sympathetic innervation of the kidney and especially of the JGA is abundant in Tupaia (fluorescence and electron microscopy). Catecholamine contents of the kidney and other organs are significantly higher in Tupaia than in rats (spectrophotofluorometry). Our results support the previously developed concept of a potent intrarenal neuroendocrine interaction at the JGA level favouring, under certain conditions of social stress, the development of acute renal failure in Tupaia belangeri.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236504
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  • 5
    Electronic Resource
    Electronic Resource
    Improved legume-rhizobium symbiosis by inoculating preceding cereal crop with rhizobium (1980)
    Springer
    Plant and soil 54 (1980), S. 313-316 
    Details
    ISSN: 1573-5036
    Keywords: Cereal ; Green gram ; Groundnut ; Improved nodulation ; Inoculation ; Legume-Rhizobium symbiosis ; Maize
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In cereal-legume crop rotation system, better Rhizobium symbiosis was obtained by double inoculation,i.e., when the preceeding cereal crop of maize was also inoculated with the same Rhizobium strain, used to inoculate the following legume crop of green gram or groundnut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181857
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  • 6
    Electronic Resource
    Electronic Resource
    Recycling of organic matter through mulch in relation to chemical and microbiological properties of soil and crop yields (1980)
    Springer
    Plant and soil 56 (1980), S. 273-281 
    Details
    ISSN: 1573-5036
    Keywords: Actinomycetes ; Azotobacter ; Alluvial soil ; Available nitrogen ; Available phosphorus ; Bacteria ; Fungi ; Green gram ; Maize ; Mulching ; Organic matter ; Recyling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field experiments were conducted to investigate the effect of organic mulching on the nutrient status, microbiological properties and the yield of maize and green gram crops. Soil organic carbon and humin and humus carbon of the fallow and the cropped soils were augmented by mulching. More of nitrogen, available phosphorus and ammoniacal and nitrate nitrogen were found in mulched soils. Soil reaction was not affected by mulching. Mulched treatments maintained more of soil moisture and soil temperature lowered during summer and rainy seasons. Population of bacteria, fungi, actinomycetes and Azotobacter were augmented in mulched treatments at all the stages of sampling. Mulching significantly increased the grain and straw yield of both the crops. The nitrogen uptake by grain was higher in mulched than in the unmulched treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205856
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of chemically mediated behavior on host tree colonization by four cohabiting species of bark beetles (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 395-414 
    Details
    ISSN: 1573-1561
    Keywords: Coleoptera ; Scolytidae ; bark beetle ; Dendrocionus ; Ips ; pheromone ; colonization ; attraction ; inhibition ; behavioral interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Chemically mediated behavioral interactions among four species of Scolytidae cohabitingPinus taeda in east Texas appear to be significant in delineating breeding areas within trees and in influencing the sequence of colonization.Dendroctonus frontalis usually arrived first and was not attracted to logs occupied by any of the threeIps species (I. avulsus, I. calligraphus, andI. grandicollis). The response ofI. avulsus to conspecific males was enhanced by the simultaneous presence of actively boring maleI. grandicollis. The response ofIps calligraphus was inhibited in areas whereI. avulsus was also present, but, in turn,I. calligraphus inhibited the response ofI. grandicollis and attractedI. avulsus. Ips grandicollis was strongly inhibited by the simultaneous presence of femaleD. frontalis or maleI. calligraphus, and in turn, maleI. grandicollis inhibitedD. frontalis. The result of this highly interactive olfactory system is that host trees are colonized very rapidly and that, in the process, disadvantageous reproductive interactions are minimized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402917
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  • 8
    Electronic Resource
    Electronic Resource
    Field responses of the western pine beetle1 and one of its predators to host- and beetle-produced compounds (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 625-641 
    Details
    ISSN: 1573-1561
    Keywords: Pinus ponderosa ; Dendroctonus brevicomis ; Temnochila chlorodia ; pheromone ; kairomone ; exo-bievicomm ; frontalin ; trans-ver-benol ; verbenone ; terpenes ; Coleoptera ; Scolytidae ; Trogositidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The responses of the western pine beetle (Dendroctonus brev-icomis LeConte) andTemnochila chlorodia (Mannerheim) to candidate attractants—exo- andendo-brevicomm, frontalin,trans-verbenol, ver-benone, and ponderosa pine turpentine and its major monoterpene components—were quantified by counts of beetles on traps baited with the various attractants, singly and in combinations released simultaneously. Combinations ofexo-brevicomin and frontalin plus a monoterpene or turpentine were the most attractive toD. brevicomis. The responses to these attractant combinations were reduced when verbenone plustrans-verbenol were present. All single compounds and binary mixtures, exceptexo-brevicomin plus frontalin, were much less attractive.exo-Brevicomin was most attractive toT. chlorodia, and this response appeared to decrease when verbenone plustrans-verbenol were present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987674
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of verbenone andtrans-verbenol on the response ofDendroctonus brevicomis to natural and synthetic attractant in the field (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 997-1013 
    Details
    ISSN: 1573-1561
    Keywords: Pinus ponderosa ; Dendroctonus brevicomis ; verbenone ; trans-verbenol ; tree protection ; bark beetle ; pheromones ; interruptant ; Coleoptera ; Scolytidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Verbenone andtrans-verbenol were investigated as candidate interruptants for use as tree protectants. Verbenone andtrans-verbenol, pheromones released byDendroctonus brevicomis during host colonization, reduced the trap catch ofD. brevicomis near sources of the attractant composed ofexo-brevicomm, frontalin, and myrcene. Catch reduction at some trap positions was greater at a high release rate than at a low release rate oftrans-verbenol alone and of the combination of verbenone plustrans-verbenol. Verbenone also reduced catches at traps baited with attractive bolts from trees under attack byD. brevicomis. Attempts to use verbenone to protect living trees fromD. brevicomis attack were inconclusive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994657
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  • 10
    Electronic Resource
    Electronic Resource
    Nutrient levels in corn and competing weed species in a first year milpa, Indian church, Belize, C.A. (1980)
    Springer
    Plant and soil 55 (1980), S. 415-427 
    Details
    ISSN: 1573-5036
    Keywords: Maize ; Nutrient levels ; Seasonal dry tropical forest ; Shifting agriculture ; Weeds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Grain production in two 1/4 hectare plots gave 2971 and 1380 kg/ha for an average yield of 2175 kg/ha. Average yield for local farmers was 1700 kg/ha. Weed biomass accounted for 50% of total bioomass in the hydric Site 4, but held 64–83% of the total nutrients. In the mesic Site 1, values were 5% and 3–29% respectively.Canna edulis was the most abundant weed species. Soil nutrient levels neither increased or decreased significantly between clearing and harvesting. Any decline in future crop production would be due to increased weed competition and not a decline in soil fertility. Weevil (Sitophilus zeamais) infestation is a serious problem in hybrid corn not encountered with local varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182702
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