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  • 1
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    Applications of nonuniform fast transform algorithms in numerical solutions of differential and integral equations (2000)
    In:  IEEE Transactions on Geoscience and Remote Sensing, L'wiw, Inst. f. Theoret. Geodäsie, vol. 38, no. 4, pp. 1551-1560, pp. B01408, (ISSN: 1340-4202)
    Details
    Publication Date: 2000
    Keywords: Transformations ; Data analysis / ~ processing ; mathematics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Acoustic isolation of a monopole logging while drilling tool by combining natural stopbands of pipe extensional waves (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-10
    Description: For extensional wave propagation along a cylindrical pipe, there exists a natural stopband in the frequency range between the first and second modes. This study explores the feasibility and practicality of building a drill collar acoustic extensional-wave isolator by combining the stopbands of pipes of different thicknesses. Numerical modelling shows that this is indeed possible and a stopband of designated width can be obtained using an optimization procedure. Laboratory measurement on an optimized design further verified this concept. The result provides a viable approach for the acoustic isolation design of a logging while drilling acoustic tool.
    Keywords: Marine Geosciences and Applied Geophysics
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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    PAPER CURRENT
  • 3
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    Chaperonins facilitate KNOTTED1 cell-to-cell trafficking and stem cell function (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: Cell-to-cell communication in plants includes the selective trafficking of transcription factors and other signals through plasmodesmata. The KNOTTED1 (KN1) homeobox (KNOX) family transcription factors, which use this pathway, are essential for stem cell establishment and/or maintenance. Here we show that KN1 trafficking requires the chaperonin complex, which belongs to a group of cytosolic chaperones that fold specific substrate proteins. Genetic and physical interaction data show a functional relevance for chaperonins in KNOX family-dependent stem cell maintenance. Furthermore, tissue-specific complementation assays indicate a mechanistic basis for chaperonin function during the posttranslocational refolding process. Our study shows that chaperonins are essential for the cell-to-cell trafficking of a subset of mobile transcription factors and demonstrates the importance of chaperonin-dependent protein trafficking for plant stem cell function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Xianfeng Morgan -- Wang, Jing -- Xuan, Zhenyu -- Goldshmidt, Alexander -- Borrill, Philippa G M -- Hariharan, Nisha -- Kim, Jae Yean -- Jackson, David -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1141-4. doi: 10.1126/science.1205727.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868675" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/cytology/genetics/growth & development/*metabolism ; Arabidopsis Proteins/chemistry/metabolism ; *Cell Communication ; Chaperonins/*metabolism ; Cytoskeleton/physiology ; Homeodomain Proteins/chemistry/genetics/*metabolism ; Meristem/*cytology/physiology ; Mutation ; Plant Leaves/cytology/growth & development/metabolism ; Plant Proteins/chemistry/genetics/*metabolism ; Plasmodesmata/*metabolism ; Protein Folding ; Protein Transport ; Recombinant Fusion Proteins/chemistry/metabolism ; Zea mays/cytology/genetics/*metabolism
    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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  • 4
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    Subdomains within orientation columns of primary visual cortex (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉In the mammalian visual system, early stages of visual form processing begin with orientation-selective neurons in primary visual cortex (V1). In many species (including humans, monkeys, tree shrews, cats, and ferrets), these neurons are organized in a beautifully arrayed pinwheel-like orientation columns, which shift in orientation preference across V1. However, to date, the relationship of orientation architecture to the encoding of multiple elemental aspects of visual contours is still unknown. Here, using a novel, highly accurate method of targeting electrode position, we report for the first time the presence of three subdomains within single orientation domains. We suggest that these zones subserve computation of distinct aspects of visual contours and propose a novel tripartite pinwheel-centered view of an orientation hypercolumn.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of the NADH-binding subunit of energy-transducing NADH-quinone oxidoreductase (NDH-1) of thermus thermophilus HB-8
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 174 (1991), S. 667-672 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(91)91469-S
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of temperature on the incubation and latent periods of hawthorn powdery mildew (Podosphaera clandestina) (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 49 (2000), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The effects of temperature on the length of the incubation and latent periods of hawthorn powdery mildew, caused by Podosphaera clandestina, were studied. At constant temperatures over the range 10–28°C, the incubation period ranged from 5 to 14 days and the latent period from 5 to 16 days; no visible colonies had developed at 30°C after 15 days. The relationships between temperature and the rates of fungus development within the incubation and latent periods were well described by a nonlinear model. The resulting curves were asymmetrically bell-shaped with an optimum temperature of approximately 23°C. The lengths of the incubation and latent periods under fluctuating temperatures were also determined, and were used to evaluate the models developed from constant temperature experiments for their accuracy of prediction. The incubation and latent periods under fluctuating temperature regimes were predicted using a rate-summation scheme with a time step of 24 min, by integrating the respective incubation and latent rate functions obtained under constant temperatures. The predicted incubation or latent periods agreed well with the observed values. Under constant temperature the interval between the times when symptoms and sporulation on the same leaflet were first observed was very short, on average 〈1 day, and was not significantly correlated with temperature. However, this interval was negatively correlated with mean temperature under fluctuating regimes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2000.00520.x
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  • 7
    Electronic Resource
    Electronic Resource
    Stochastic simulation of the spread of race-specific and race-nonspecific aerial fungal pathogens in cultivar mixtures (2000)
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Plant pathology 49 (2000), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The spread of race-specific and -nonspecific fungal pathogens in cultivar mixtures over space and time was simulated using an individual-based, spatially explicit stochastic model. The spatial spread of disease was simulated using a half-Cauchy distribution. The effects of five simulation variables on the effectiveness of cultivar mixtures in reducing disease development were investigated. These simulation variables were the sporulation rate, the median spore dispersal distance, the probabilities of cross-infection among hosts and pathogen races, the proportion of host plants that were completely susceptible (or, in the case of race-specific pathogens, the numbers of mixture components) and the spatial arrangement of the mixture components. Disease dynamics were summarized by the rate parameters of logistic equations and by the area under the disease progress curve (AUDPC) of incidence and severity. The potential reduction in disease development in cultivar mixtures, compared with pure cultures, was considerable. Mixtures were more effective in reducing race-specific pathogens than race-nonspecific pathogens. For both types of pathogen, most variation in logit-transformed mixture efficacy was due to the main effects of the simulation variables. For race-nonspecific pathogens, the performance of mixtures was influenced mainly by the proportion of plants that were susceptible and by the spatial arrangement of the two mixture components. For race-specific pathogens, the performance of mixtures was determined mainly by the number and the spatial arrangement of mixture components. The smaller the homogeneous genotype area, the greater the mixture efficacy. Higher sporulation rate decreased mixture efficacy. Planting the mixture components in square blocks was more effective in reducing disease than planting in strips. For race-nonspecific pathogens, increasing the proportion of susceptible plants decreased the mixture efficacy. For race-specific pathogens, disease in mixtures decreased with increasing numbers of mixture components. The effect on the mixture efficacy of increasing cross-infection probability from 0 to 0.25 was generally small. For the AUDPC-based efficacy of disease severity, the effects of median spore dispersal distance were also very large: the shorter the median spore dispersal distance, the less effective the mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2000_t01-1-00444.x
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  • 8
    Electronic Resource
    Electronic Resource
    The effects of constant and fluctuating temperatures on the length of the incubation period of apple powdery mildew (Podosphaera leucotricha) (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 45 (1996), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The effects of constant and fluctuating temperatures on the incubation period of apple powdery mildew, caused by Podosphaera leucotricha, were studied. At constant temperatures, incubation periods ranged from 3 to 12 days over temperatures 8°C–30°C, and no visible lesions developed at 32°C. A nonlinear model was developed to describe the relationship between temperature and the rate of mildew colony development. The resulting curve is bell-shaped with an optimum temperature at about 23°C. When this model was used to predict mildew development under fluctuating temperatures at an integration step of 48 min, however, it consistently overestimated development rate for fluctuating periods with average temperatures higher than 20°C. A nonlinear model was also fitted directly to the fluctuating temperature data, thus taking into account the nonlinear effect. The overestimation of development rate by the constant model for high temperatures was confirmed when the two models were compared. This overestimation probably resulted from differences in the levels of relative humidity between constant and fluctuating temperature regimes. Possible practical use of the model is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1996.tb02903.x
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  • 9
    Electronic Resource
    Electronic Resource
    Use of SADIE statistics to study spatial dynamics of plant disease epidemics (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 53 (2004), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Using a previously developed stochastic simulation model for plant disease epidemics, the relationship of the SADIE aggregation statistic Ia with initial epidemic conditions, spore dispersal distance, sampling quadrat size and other spatial statistics was investigated. Most variation in Ia was attributable to the initial spatial pattern of infected plants and sampling quadrat size. The importance of initial spatial pattern on SADIE clustering indices (for patches and gaps) was also demonstrated using a number of selected data sets. Correlation of Ia with clustering indices was close to 1·0. Epidemics arising from the regular and random initial patterns resulted in the smallest and greatest Ia values, respectively, at sampling times after disease spread had occurred. Furthermore, the variability in Ia between simulation runs also varied greatly with initial patterns, being lowest and greatest for the clumped and random initial patterns, respectively. Ia increased initially and then decreased with increasing incidence, especially for the clumped and random initial patterns. Overall, the effect of median spore dispersal distance on Ia was very small, especially for the random initial pattern. The correlation between Ia and intraclass correlation was generally small and varied greatly between initial patterns. However, there was a high positive correlation between Ia and a parameter describing the rate of decline of autocorrelation over spatial lags, indicating that Ia, clustering indices and autocorrelations measure some common properties of patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.2004.00949.x
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of temperature, relative humidity and duration of wetness period on germination and infection by conidia of the pear scab pathogen (Venturia nashicola) (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 52 (2003), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Experiments were conducted to determine the effects of temperature, relative humidity (RH) and duration of wetness period on in vitro germination of conidia and infection of detached pear leaves by Venturia nashicola, the causal agent of pear scab. Conidia germinated only in near-saturation humidity (RH 〉 97%). The final percentage germination (24 h after inoculation) at 100% RH without free water was less than half that in free water. Conidia germinated over the range of temperatures tested (5–30°C); the optimum temperature for germination was ≈21°C. Changes in percentage germination of conidia over time were fitted by logistic models at each individual temperature. Polynomial models satisfactorily described the relationships between two (rate and time to 50% of maximum germination) of the three logistic model parameters and temperature. The minimum length of the wetness period for successful infection of detached pear leaves by conidia was observed at several temperatures. The shortest length of wetness period required for infection was 7 h at 22°C. Two polynomial models fitted well the relationship between the minimum wetness duration required for infection, and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2003.00887.x
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