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  • 1
    Electronic Resource
    Electronic Resource
    A Special Case of Mahler's Conjecture (1998)
    Springer
    Discrete & computational geometry 20 (1998), S. 163-177 
    Details
    ISSN: 1432-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. A special case of Mahler's conjecture on the volume-product of symmetric convex bodies in n -dimensional Euclidean space is treated here. This is the case of polytopes with at most 2n+2 vertices (or facets). Mahler's conjecture is proved in this case for n≤ 8 and the minimal bodies are characterized. 〈lsiheader〉 〈onlinepub〉7 August, 1998 〈editor〉Editors-in-Chief: &lsilt;a href=../edboard.html#chiefs&lsigt;Jacob E. Goodman, Richard Pollack&lsilt;/a&lsigt; 〈pdfname〉20n2p163.pdf 〈pdfexist〉yes 〈htmlexist〉no 〈htmlfexist〉no 〈texexist〉no 〈sectionname〉 〈/lsiheader〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000076
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  • 2
    Electronic Resource
    Electronic Resource
    Control of Verticillium wilt of cotton by means of soil solarization and tolerant cultivars in southern Spain (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Eight field experiments (I-VIII) were conducted in clay soils naturally infested with a cotton-defoliating pathotype of Verticillium dahliae in the lower Guadalquivir Valley of Andalucia, southern Spain, during the period 1986-90. Experiments I-VI aimed to determine the efficacy of soil solarization in reducing populations of the pathogen in soil and eventually contributing to the control of Verticillium wilt of cotton. The population of V. dahliae in the 0-to 40-cm soil layer was reduced to undetectable or very low levels after solarization for 6 to 10 weeks. The final incidence of Verticillium wilt in the cotton crop following solarization was reduced to 13% or less in solarized plots, compared to 55–90·5% in unsolarized controls. The onset of disease incidence in the solarized plots was delayed by 2–7 weeks, increased at a lower rate, and had a smaller area under the disease progress curve, compared to that in unsolarized plots. Seed cotton yields in solarized plots increased by 11·3-130·9% depending upon experiments, cultivars and years. Experiments VII and VIII aimed to determine the use of the highly wilt-tolerant cotton cv. Acala GC 510 for control of the disease that had been cropped to susceptible cotton cultivars the year before in solarized soils. Solarized or unsolarized plots were first sown to susceptible cotton cvs Acala SJ2 and Coker 310, and the following year were sown to cv. Acala GC 510. The inoculum density of V. dahliae at the time of sowing cv. Acala GC 510 in previously solarized plots had increased to moderate levels, but remained considerably lower than that in unsolarized plots. The final disease incidence in cv. Acala GC 510 grown in unsolarized plots was lower than that in susceptible cultivars grown in the same plots the year before. Furthermore, the disease incidence in cv. Acala GC 510 grown in solarized plots was as high as that in susceptible cultivars grown the year before with much less initial inoculum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1995.tb02776.x
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of verticillium wilt epidemics on cotton yield in southern Spain (1997)
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Plant pathology 46 (1997), 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 in the Guadalquivir Valley of Andalucía, southern Spain, in 1986 and 1987, using field plots naturally infested with different inoculum densities of the defoliating and nondefoliating pathotypes of Verticillium dahliae to determine the influence of verticillium wilt epidemics on yield of cotton cultivar Coker 310. The total number of bolls, the number of open bolls, and seed cotton yield were related to the growth stage of plants at first appearance of foliar symptoms, and to inoculum density and virulence of the V. dahliae pathotype prevailing in the soil. For the three yield components, the greatest reduction was observed in plants showing symptoms before opening of first flowers (about 650 degree-days after sowing). Yield increased with delay in the development of foliar symptoms during the crop season, and the effect of the wilt epidemics on yield was small or nil for plants that developed symptoms after opening of the first bolls (1400–1500 degree-days after sowing). A multiple regression equation was derived that related yield reduction to the physiological time accumulated from the time of sowing until the appearance of foliar symptoms and to the rate of disease intensity increase over physiological time. This multiple point model explained about 70% of the variation in cotton yield loss due to verticillium wilt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.1997.d01-221.x
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of chaotic escape from a potential well using small parametric modulations (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 5518-5523 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown theoretically for the first time that, depending on its period, amplitude, and initial phase, a periodic parametric modulation can suppress a chaotic escape from a potential well. The instance of the Helmholtz oscillator is used to demonstrate, by means of Melnikov's method, that parametric modulations of the linear or quadratic potential terms inhibit chaotic escape when certain resonance conditions are met. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531720
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of Hubbard clusters: Noncollinear spins in N-atom clusters : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4170-4172 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ground-state magnetic properties of clusters with N-atomic sites are studied by solving the single-band Hubbard Hamiltonian in the unrestricted Hartree–Fock approximation. Three-dimensional arrangements of spins are considered in the solution. Results for stability and magnetic order, as a function of the Coulomb interaction strength U/t, and number of electrons ν, are presented for all the clusters with N=3, 4, and for the set of N=13 fcc-, hcp-, icosahedral-, and bcc-like clusters. In most cases, for band fillings (ν) close to half-band |ν/N−1|≤0.2−0.4, it is found that the antiferromagneticlike noncollinear spin solutions yield the smallest energy for U/t larger than a critical value (0〈(U/t)c≤6). ©1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365128
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  • 6
    Electronic Resource
    Electronic Resource
    Boron penetration studies from p+ polycrystalline Si through HfSixOy (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 1074-1076 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present detailed B penetration studies from B-doped polysilicon through alternate gate dielectric candidate HfSixOy films. No detectible B penetration is observed for annealing times as long as 20 s after 950 °C. Considerable B incorporation into the Si substrate is observed for annealing temperatures higher than 950 °C. By modeling the B depth profiles, we calculated the B diffusivities through HfSixOy to be higher than the corresponding diffusivities for SiO2. B diffusion through grain boundaries after HfSixOy crystallization is proposed to be responsible for the enhanced B diffusivity observed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1498872
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  • 7
    Electronic Resource
    Electronic Resource
    Surgical treatment of the hepatic hydatid cyst (1981)
    Springer
    World journal of surgery 5 (1981), S. 763-764 
    Details
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des kystes hydatiques hépatiques ont été étudiés auprès de 79 malades entre 1973 et 1980; 23 d'entre eux ont été traités par kystectomie, 33 par hépatectomie partielle et les 23 restant par drainage interne. Le drainage interne était indiqué soit en raison d'une infection bactérielle du kyste, soit de par la situation anatomique du kyste en empêchant l'enlèvement. Les auteurs enregistrent 3 décès dont 2 sont dûs à une septicémie résultant du drainage interne et le troisième à une septicémie provenant d'une hémopéritonite post-opératoire. Les complications les plus sérieuses observées ont été saignement intrapéritonéal et infection. Des 5 cas de saignement intrapéritonéal, 3 sont apparus suite à une hépatectomie partielle; dans un autre cas, il y a seulement eu complication de la kystectomie, et le dernier cas était une conséquence du drainage interne. Des complications septicémiques ont été observées dans 15 cas. Suite au drainage interne il y a eu 10 cas d'abcès sous-phrénique, hépatique ou sous-hépatique; 3 cas similaires ont été observés dans le groupe traité par hépatectomie et un cas dans le groupe traité par kystectomie. Le séjour postopératoire moyen était de 5 jours pour le groupe traité par kystectomie, de 20 pour le groupe traité par hépatectomie et de 30 pour le groupe traité par drainage interne. L'hépatectomie partielle, en enlevant le tissu fibreux autour de la cavité du kyste, réduit le risque de formation d'abcès à cet endroit.
    Notes: Abstract Hepatic hydatid cysts were seen in 79 patients between 1973 and 1980: 23 were treated by cystectomy, 33 by partial hepatectomy, and the remaining 23 by internal drainage. The indication for internal drainage was bacterial infection of the cyst, or the anatomical site of the cyst preventing excision. There were 3 deaths, 2 due to sepsis following internal drainage, and the third due to sepsis following a postoperative hemoperitoneum. The most serious complications seen were intraperitoneal bleeding and infection. Of the 5 cases of intraperitoneal bleeding, 3 followed partial hepatectomy; one complicated cystectomy alone; and one occurred after internal drainage. Septic complications were seen in 15 cases. Following internal drainage there were 10 cases of subphrenic, hepatic or subhepatic abscess; 3 similar cases were seen in the hepatectomy group and 1 in the cystectomy group. The average postoperative stay was 5 days for the cystectomy group, 20 for the partial hepatectomy group, and 30 for the internal drainage group. Partial hepatectomy, by removing the fibrous ecto cyst cavity, reduces the risk of abscess formation at this site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01657950
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of different preservation solutions on adenine nucleotide content and metabolism in human kidney transplantation (1994)
    Springer
    Transplant international 7 (1994), S. 96-100 
    Details
    ISSN: 1432-2277
    Keywords: Preservation, kidney, numan ; Kidney, preservation, human ; UW solution, kidney ; Euro-Collins solution, kidney ; ATP, kidney, human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Differences in purine metabolism produced by three preservation solutions were studied by determining the adenine nucleotide (ATP, ADP, AMP, and IMP) and nucleoside (adenosine, inosine, and hypoxanthine) levels in human kidney cortical biopsies. Forty kidney allografts were studied using University of Wisconsin (UW) solution (n=20), Euro-Collins (EC) solution (n=12), and modified EC solution with mannitol (M;n=8). No significant differences were found between the three solutions studied with regard to ATP, ADP, or AMP changes. The mean ATP level (nmol/mg prot±SEM) at the end of preservation in the UW group was 2.7±0.3 nmol/mg, in the EC group 3.8±0.7 nmol/mg, and in the M group 2.3±0.4 nmol/mg. ATP 30 min after reperfusion in the UW, EC, and M groups was 5.7±0.8 nmol/mg, 6.4±1.0 nmol/mg, and 4.6±0.5 nmol/mg, respectively. However, an important difference appeared in the catabolic products determined. Kidneys perfused with UW solution had a significantly higher level of adenosine (2.6±0.6 nmol/mg), inosine (11.8±2.2 nmol/mg), and hypoxanthine (18.1±2.1 nmol/mg) at hypoxanthine of cold storage than those perfused with EC (0.4±0.1 nmol/mg, 2.0±0.8 nmol/mg, and 7.1±1.4 nmol/mg) and M solutions (0.2±0.05 nmol/mg, 0.5±0.1 nmol/mg, and 5.2±0.6 nmol/mg; P〈0.05). These levels returned to initial values 30 min postreperfusion and there were no differences with the EC or M solution groups at that time. Thus, the adenosine present in UW solution does not appear to be useful in recovering the adenine nucleotide pool at reperfusion. Moreover, it produces a marked increase in degradation products. Our findings do not support the beneficial metabolic effect of UW solution in terms of adenine nucleotide metabolism in comparison with simpler and less expensive preservation solutions like EC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336469
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship between viral genotype and viral load in patients with chronic hepatitis C (1996)
    Springer
    European journal of clinical microbiology & infectious diseases 15 (1996), S. 884-887 
    Details
    ISSN: 1435-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To determine the distribution of hepatitis C virus (HCV) genotypes and to relate genotype to viral load, genotyping and quantification of viral RNA were carried out in 35 patients with chronic hepatitis C. Subtype 1a was most prevalent (43%), followed by subtypes 1b (23%) and 3a (14%). Mean viral load (log HCV-RNA copies/ml) for subtypes 1b, 1a and 3a was 7.1 ± 1, 5.6 ± 1.1 and 4.1 ± 2.4, respectively. The presence of immunoglobulin M was related to the duration of hepatitis and genotype 1 to a more severe hepatic injury and a higher viral load. Differences observed in viral load for a single HCV subtype justify the need to quantify HCV-RNA prior to establishing antiviral therapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01691224
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  • 10
    Electronic Resource
    Electronic Resource
    Farkas-Minkowski systems in semi-infinite programming (1981)
    Springer
    Applied mathematics & optimization 7 (1981), S. 295-308 
    Details
    ISSN: 1432-0606
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The Farkas-Minkowski systems are characterized through a convex cone associated to the system, and some sufficient conditions are given that guarantee the mentioned property. The role of such systems in semi-infinite programming is studied in the linear case by means of the duality, and, in the nonlinear case, in connection with optimality conditions. In the last case the property appears as a constraint qualification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01442122
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