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Artykuły w czasopismach na temat "Qa278.2 .c5 2000"
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Herberhold, Max, Yan-Xiang Cheng, Guo-Xin Jin i Wolfgang Milius. "1,1′-Di(tert-butyl)metallocenium Cations. The X-Ray Crystal Structures of [M(C5H4tBu)2]PF6 (M = Fe, Co) and [Co (C5H4t Bu)2]2CoCl4". Zeitschrift für Naturforschung B 55, nr 9 (1.09.2000): 814–20. http://dx.doi.org/10.1515/znb-2000-0905.
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The hexafluorophosphate salts [Fe(C5H4tBu)2]PF6 (1) and [Co(C5 H4 tBu)2]PF6 (2) crystallize in isotypic structures with centrosymmetric cations which have a staggered (transoid) conformation of the exactly parallel ring ligands (conformational angle τ = 180°). The tetrachlorocobaltate salt, [Co(C5H4tBu)2 ]2 CoCl4 (3), contains one almost eclipsed (τ = 140.4°) and one almost staggered (τ = 101.4°) cobaltocenium cation; in both cases, the cyclopentadienyl ring planes are slightly inclined (by α = 5.4° and 4.1°, respectively) to give more room to the tert-butyl substituents which are bent away from the metal in all three complexes 1 - 3
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Ito, T., H. Shinohara i S. Nishimoto. "Conformational Effects on Photophysical Characteristics of C5–C5′-linked Dihydrothymine Dimers in Solution¶". Photochemistry and Photobiology 72, nr 6 (2000): 719. http://dx.doi.org/10.1562/0031-8655(2000)072<0719:ceopco>2.0.co;2.
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Costa, Edílson, i Paulo A. M. Leal. "Produção de alface hidropônica em três ambientes de cultivo". Engenharia Agrícola 29, nr 3 (wrzesień 2009): 358–69. http://dx.doi.org/10.1590/s0100-69162009000300003.
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Propôs-se avaliar a produção hidropônica de alface-crespa, variedade "Vera", em bancadas inclinadas com canais de 100 mm, utilizando a técnica de filme de solução nutritiva, em resposta à aplicação de dióxido de carbono e ao resfriamento evaporativo. Realizaram-se cinco ciclos de cultivo nos períodos de 20-3 a 17-4-2000 (C1); 25-5 a 29-6-2000 (C2); 13-7 a 21-8-2000 (C3); 27-8 a 2-10-2000 (C4) e 12-12-2000 a 10-1-2001 (C5). Avaliaram-se três casas de vegetação, sendo casa de vegetação sem sistema de resfriamento evaporativo do ar e sem injeção aérea de CO2 (A1); casa de vegetação com injeção aérea de CO2 e sem sistema de resfriamento evaporativo do ar (A2), e casa de vegetação com injeção aérea de CO2 e com sistema de resfriamento evaporativo do ar do tipo meio poroso-exaustor (A3). Avaliaram-se as massas frescas e secas em gramas, o número de folhas e a área foliar em mm². Utilizou-se do delineamento inteiramente casualizado, em que, no ciclo C1, utilizaram-se 48 repetições por ambiente; para os ciclos C2, C3 e C5, foram 64 repetições, e para o ciclo C4, foram 24 repetições. O ambiente climatizado com incremento de dióxido de carbono promoveu melhor desenvolvimento das plantas, com maior número de folhas comercializáveis. Em ambientes não climatizados, o incremento de CO2 não resultou em aumento de produtividade da alface para a maioria dos ciclos. Em épocas de temperaturas mais elevadas, obtiveram-se plantas maiores, com maior número de folhas.
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Mira, Jose L., i Guang Fan. "Leiomyoma of the Male Urethra". Archives of Pathology & Laboratory Medicine 124, nr 2 (1.02.2000): 302–3. http://dx.doi.org/10.5858/2000-124-0302-lotmu.
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Abstract We describe the case of a 48-year-old quadriplegic black man with history of C4-C5 cervical spine and cord injury secondary to a fall, who presented to the University of Cincinnati Medical Center Urology Service with obstructive symptoms at urination. A bulbous urethral stricture was diagnosed and subsequently resected with primary urethral reanastomosis. On pathologic examination, the surgical specimen contained an epithelioid leiomyoma at the site of the urethral stricture. Although leiomyomas of the female urethra are relatively common, we identified only 2 previously reported cases of leiomyomas of the male urethra in the English-language medical literature. To the best of our knowledge, we describe the third case of leiomyoma of the male urethra, the first of the epithelioid type.
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Xu, Fushen, Luis E. De Las Casas i Larry J. Dobbs. "Primary Meningeal Rhabdomyosarcoma in a Child With Hypomelanosis of Ito". Archives of Pathology & Laboratory Medicine 124, nr 5 (1.05.2000): 762–65. http://dx.doi.org/10.5858/2000-124-0762-pmriac.
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Abstract Intracranial rhabdomyosarcomas are rare neoplasms, and those thought to be primary meningeal tumors are even more rare. Hypomelanosis of Ito is a neurocutaneous disorder believed to involve a defect in cells of neural crest origin. We report the case of a 15-month-old boy with hypomelanosis of Ito who developed a primary meningeal rhabdomyosarcoma. The patient initially presented with hydrocephalus and 2 months later developed neurologic signs localizing to the spinal cord. Radiologic studies revealed widespread leptomeningeal enhancement with compression of the spinal cord at C5-C7. A brain biopsy revealed a tumor diffusely involving the meninges. Microscopically, the tumor was composed of rhabdomyoblasts, many of which showed prominent cross-striations on routine hematoxylin-eosin staining. To the best of our knowledge, this is the first reported case of meningeal rhabdomyosarcoma in a patient with hypomelanosis of Ito and the fourth reported case of a primary meningeal rhabdomyosarcoma reported in the world literature.
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Park, Min S., Henry E. Aryan, Burak M. Ozgur, Rahul Jandial i William R. Taylor. "Stabilization of Anterior Cervical Spine with Bioabsorbable Polymer in One- and Two-level Fusions". Neurosurgery 54, nr 3 (1.03.2004): 631–35. http://dx.doi.org/10.1227/01.neu.0000108942.07872.2a.
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Abstract OBJECTIVE We present our experience using a bioabsorbable polymer in the surgical management of one- and two-level degenerative disc disease of the cervical spine with anterior cervical discectomy and fusion. Twenty-six patients were treated at the University of California, San Diego Medical Center or the Veterans Affairs Medical Center in San Diego, CA. All cases were performed under the direction of a single neurosurgeon (WRT). METHODS A retrospective review of patients' charts and imaging was performed to determine outcomes after anterior cervical spine operations. Specifically, we looked at the need for additional surgery, local reaction to the bioabsorbable polymer, fusion rate, and complications. Procedures involved the C3–C4, C4–C5, C5–C6, and/or C6–C7 levels, and fibular allograft was used in all but one case. The anterior cervical discectomy and fusion procedures with internal fixation were performed in 26 patients between March 2000 and November 2001. The patients were followed for up to 2 years after surgery (average, 14 mo). RESULTS Radiographic fusion was achieved in 25 (96.2%) of 26 patients. Only one instance of treatment failure was encountered that required additional surgery and the placement of a titanium plate. There were no clinical signs or symptoms of reaction to the bioabsorbable material. CONCLUSION The rates of fusion after single-level anterior cervical discectomy and fusion with internal fixation using bioabsorbable polymer and screws in this study match those using metallic implants, as previously reported in the literature, and are superior to those achieved with noninstrumented fusions. Preliminary results suggest that this newly available technology for anterior fusion is as effective in single-level disease as traditional titanium plating systems. The bioabsorbable material seems to be tolerated well by patients. A larger, randomized, controlled study is necessary to bring the results to statistical significance.
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Helmig, D., V. Petrenko, P. Martinerie, E. Witrant, T. Röckmann, A. Zuiderweg, R. Holzinger i in. "Reconstruction of Northern Hemisphere 1950–2010 atmospheric non-methane hydrocarbons". Atmospheric Chemistry and Physics Discussions 13, nr 5 (15.05.2013): 12991–3043. http://dx.doi.org/10.5194/acpd-13-12991-2013.
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Abstract. The short-chain non-methane hydrocarbons (NMHC) are mostly emitted into the atmosphere by anthropogenic processes. Recent studies have pointed out a tight linkage between the atmospheric mole fractions of the NMHC ethane to the atmospheric growth rate of methane. Consequently, atmospheric NMHC are valuable indicators for tracking changes in anthropogenic emissions, photochemical ozone production, and greenhouse gases. This study investigates the 1950–2010 Northern Hemisphere atmospheric C2-C5 NMHC ethane, propane, i-butane, n-butane, i-pentane, and n-pentane. Atmospheric mole fractions of these trace gases were constructed from (a) air samples of these trace gases from air samples extracted from three firn boreholes in 2008 and 2009 at the North Greenland Eemian Ice Drilling (NEEM) site using state of the art models of trace gas transport in firn, and by (b) considering eight years of ambient NMHC monitoring data from five Arctic sites within the NOAA Global Monitoring Division (GMD) Cooperative Air Sampling Network. Results indicate that these NMHC increased by ~ 40–120% after 1950, peaked around 1980 (with the exception of ethane, which peaked approximately 10 years earlier), and have since dramatically decreased to be now back close to 1950 levels. The earlier peak time of ethane versus the C3-C5 NMHC suggests that different processes and emissions mitigation measures contributed to the decline in these NMHC. The 60 yr record also illustrates notable increases in the ratios of the isomeric iso-/n-butane and iso-/n-pentane ratios. Comparison of the reconstructed NMHC histories with 1950–2000 volatile organic compounds (VOC) emissions data and with other recently published ethane trend analyses from ambient air Pacific transect data showed (a) better agreement with North America and Western Europe emissions than with total Northern Hemisphere emissions data, and (b) better agreement with other Greenland firn air data NMHC history reconstructions than with the Pacific region trends. These analyses emphasize that for NMHC, having atmospheric lifetimes on the order of < 2 months, the Greenland firn air records are primarily a representation of Western Europe and North America emission histories.
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Helmig, D., V. Petrenko, P. Martinerie, E. Witrant, T. Röckmann, A. Zuiderweg, R. Holzinger i in. "Reconstruction of Northern Hemisphere 1950–2010 atmospheric non-methane hydrocarbons". Atmospheric Chemistry and Physics 14, nr 3 (10.02.2014): 1463–83. http://dx.doi.org/10.5194/acp-14-1463-2014.
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Abstract. The short-chain non-methane hydrocarbons (NMHC) are mostly emitted into the atmosphere by anthropogenic processes. Recent studies have pointed out a tight linkage between the atmospheric mole fractions of the NMHC ethane and the atmospheric growth rate of methane. Consequently, atmospheric NMHC are valuable indicators for tracking changes in anthropogenic emissions, photochemical ozone production, and greenhouse gases. This study investigates the 1950–2010 Northern Hemisphere atmospheric C2–C5 NMHC ethane, propane, i-butane, n-butane, i-pentane, and n-pentane by (a) reconstructing atmospheric mole fractions of these trace gases using firn air extracted from three boreholes in 2008 and 2009 at the North Greenland Eemian Ice Drilling (NEEM) site and applying state-of-the-art models of trace gas transport in firn, and by (b) considering eight years of ambient NMHC monitoring data from five Arctic sites within the NOAA Global Monitoring Division (GMD) Cooperative Air Sampling Network. Results indicate that these NMHC increased by ~40–120% after 1950, peaked around 1980 (with the exception of ethane, which peaked approximately 10 yr earlier), and have since dramatically decreased to be now back close to 1950 levels. The earlier peak time of ethane vs. the C3–C5 NMHC suggests that different processes and emissions mitigation measures contributed to the decline in these NMHC. The 60 yr record also illustrates notable increases in the ratios of the isomeric iso-/n-butane and iso-/n-pentane ratios. Comparison of the reconstructed NMHC histories with 1950–2000 volatile organic compounds (VOC) emissions data and with other recently published ethane trend analyses from ambient air Pacific transect data showed (a) better agreement with North America and Western Europe emissions than with total Northern Hemisphere emissions data, and (b) better agreement with other Greenland firn air data NMHC history reconstructions than with the Pacific region trends. These analyses emphasize that for NMHC, having atmospheric lifetimes on the order of < 2 months, the Greenland firn air records are primarily a representation of Western Europe and North America emission histories.
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Coquet, Sandrina, i Parisa A. Ariya. "Kinetics of the gas-phase reactions of Cl atom with selected C2-C5 unsaturated hydrocarbons at 283". International Journal of Chemical Kinetics 32, nr 8 (2000): 478–84. http://dx.doi.org/10.1002/1097-4601(2000)32:8<478::aid-kin5>3.0.co;2-s.
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Martins, Daniela Ribeiro, Otávio Antonio de Camargo i Ondino Cleante Bataclia. "Qualidade do grão e da bebida em cafeeiros tratados com lodo de esgoto". Bragantia 64, nr 1 (2005): 115–26. http://dx.doi.org/10.1590/s0006-87052005000100013.
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O objetivo deste trabalho foi avaliar o efeito da aplicação de lodo de esgoto (LE) em plantação comercial de café, sobre a qualidade de bebida, avaliada pela atividade da enzima polifenoloxidase (PFO) e por análise sensorial. O trabalho foi realizado em condições de campo, na Fazenda Santa Elisa, localizada no município de Patrocínio Paulista (SP), em 2001 e 2002. A variedade de café usada em todos os talhões foi Acaiá. O plano de trabalho constou da análise de talhões comerciais em seis agrupamentos, conforme as doses e freqüências de aplicação de lodo de esgoto, denominados tratamentos. Todos os talhões receberam adubação mineral, conforme a análise de solo, e assim foram definidos os diferentes tratamentos. Tratamento 1: talhões B2, B3, B4 e B5, sem aplicação de lodo de esgoto; tratamento 2: talhões C5 e C6, 9,0 T ha-1 de LE (1998), 4,8 t ha-1 (1999) ,11,8 t ha-1 (2000) e 4,2 t ha-1 (2002); tratamento 3: talhões D5 e D6, 9,0 t ha-1 de LE (1998), 4,8 t ha-1 (1999), 11,8 t ha-1 (2000) e 4,2 t ha-1 (2002); tratamento 4: talhões E1 e E2, 9,0 t ha-1 de LE (1998) e 4,2 t ha-1 (2002); tratamento 5: talhões E3 e E4, 9,0 t ha-1 de LE (1998), 4,8 t ha-1 (1999) e 4,2 t ha-1 (2002); tratamento 6: talhões H1, H2, H3, H4 e H5, 22,4 t ha-1 (1999). Foi realizada análise visual dos grãos quanto ao tamanho, e a qualidade da bebida, avaliada pela prova de xícara e atividade da enzima polifenoloxidase. A aplicação de lodo de esgoto não afetou a qualidade da bebida nas condições deste experimento. Houve baixa concordância entre as classificações obtidas pela atividade da polifenoloxidase e pela prova de xícara, para os dois anos analisados.