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61.
J. L. Bailly S. Banerjee W. Bartl C. Caso Y. Chiba A. Ferrando F. Fontanelli T. Gemesy R. Hamatsu J. Hanton J. Hrubec Y. Iga Yu. Ivanyshenkov L. Jenik N. Khalatyan E. Kistenev S. Kitamura J. M. Kohli S. Krasznovszky V. Kubik D. Kuhn B. B. Levchenko J. MacNaughton P. K. Malhotra J. C. Marin I. S. Mittra L. Montanet G. Neuhofer H. Oberguggenberger P. Porth R. Raghavan T. Rodrigo J. B. Singh S. Squarcia K. Takahashi L. A. Tikhonova U. Trevisan T. Yamagata V. Yarba G. Zholobov S. A. Zotkin EHS-RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1987,35(3):301-307
360 GeV/c proton interactions with aluminium (Al) and gold (Au) targets are studied using the European Hybrid Spectrometer (EHS) equipped with the Rapid Cycling Bubble Chamber (RCBC). Multiplicities, rapidity distributions and correlations between leading and other produced particles are presented and compared with Monte Carlo calculations based on the multi-chain and Lund models. 相似文献
62.
M. Barth C. De Clercq E. De Wolf J. J. Dumont M. Gijsen D. P. Johnson J. Lemonne P. Peeters H. Drevermann Y. Goldschmidt-Clermont G. Harigel J. P. Porte R. T. Ross A. Stergiou C. Caso R. Contri R. Monge S. Squarcia U. Trevisan J. F. Baland J. Beaufays F. Grard J. Kesteman P. A. van der Poel W. Kittel W. J. Metzger D. J. Schotanus R. T. Van de Walle Y. A. Belokopitov P. V. Chliapnikov A. B. Fenyuk S. V. Klimenko V. M. Kubic S. B. Lugovsky V. N. Nikolaenko Y. L. Petrovikh V. M. Ronjin A. P. Vorobjev V. A. Yarba G. Alexander S. Dagan D. Lissauer C. Milstene 《Zeitschrift fur Physik C Particles and Fields》1979,2(4):285-290
Cross sections and charged multiplicity distributions forK + p interactions at 70 GeV/c are presented and compared withK + p data at other energies. Comparisons are also made with available π+ p,pp, andK ? p data. 相似文献
63.
J. L. Bailly S. Banerjee W. Bartl F. Bruyant W. M. Bugg C. Caso Y. Chiba R. Contri F. Crijns R. Di Marco B. Epp A. Ferrando F. Fontanelli A. Gurtu R. Hamatsu E. L. Hart P. Herquet J. Hrubec N. Khalatjan E. Kistenev I. Kita D. Kuhn A. Kursonenko J. MacNaughton J. C. Marin M. Markytan I. S. Mittra L. Montanet G. Neuhofer N. Ohshima Y. Petrovikh B. Pylgroms R. Plano R. Raghavan M. Regler T. Rodrigo A. H. Rogers J. Salicio K. Shankai J. B. Singh S. Squarcia P. Stamer D. Toet U. Trevisan P. van Hal C. Willmott G. Zholobov EHS-RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,23(3):205-212
Using data obtained with EHS equipped with the Rapid Cycling Bubble Chamber (RCBC) exposed to a proton beam of 360 GeV/c, we calculate topological cross sections. We present in great detail the procedure and the techniques used to correct raw data. Finally, we give multiplicity moments and multiplicity correlations and we compare the values obtained in our experiment, together with data at other energies, with different models. 相似文献
64.
Ultraviolet-visible spectra of flower extracts of the Hibiscus rosa-sinensys L. var. regius maximus species have been measured between 240.02 and 747.97 nm at pH values ranging from 1.1 to 13.0. Deconvolution of these spectra using the Parallel Factor Analysis (PARAFAC) model permitted the study of anthocyanin systems without isolation and purification of the individual species. Seven species were identified: flavilium cation, carbinol, quinoidal base, and E and Z-chacone and their ionized forms. The concentration changes of flavilium cation, quinoidal basen, and E and Z ionized chalcones were determined as function of pH at the different wavelengths. The flavilium cation, quinoidal base, and ionized E-clacone are involved in tho stage kinetic processes, a fast one followed by a slower one. Ionized Z-chalcone obeys a simple first-order processes. The spectral profiles recovered by PARAFAC model are in excellent agreement with bands of experimental spectra reported in the literature for the individual species measured at specific pH values. These results complement those obtained using chemical and simple mathematical techniques and demonstrate how chemometric methods can resolve problems for complex systems. 相似文献
65.
Rosa AH Vicente AA Rocha JC Trevisan HC 《Fresenius' Journal of Analytical Chemistry》2000,368(7):730-733
Invertase was immobilized on aminopropyl silica (APTS-SiO2) activated with humic substances (APTS-SiO2-HS) and on aminopropyl silica activated with glutaraldehyde (APTS-SiO2-GA). The resulting activity of both systems was compared. Humic substances (HS) used for the activation of the silica were extracted from soil of Cananéia, S?o Paulo State, Brazil, according to the procedure recommended by the International Humic Substances Society. Activity was determined by measuring the rate of formation of reduced sugars using the reaction with dinitrosalicylic acid (DNS). The amount of HS bound on the APTS-SiO2 was equal to 50 mg. The maximum amount of invertase immobilized on APTS-SiO2-HS was 15,200 U/g while in the system APTS-SiO2-GA it was 13,400 U/g. The experimental enzymatic activity was 3,700 and 3,300 U/g, for the systems APTS-SiO2-HS and APTS-SiO2-GA, respectively. Considering the increased amount and activity of immobilized enzyme compared with the glutaraldehyde method, it was concluded that this technique opens a new perspective in the preparation of supports for enzyme immobilization employing humic substances. 相似文献
66.
Fourier transform mid-infrared spectroscopy (FT-MIR) coupled with a homemade attenuated total reflectance (ATR) flow-cell was used for on-line monitoring of a biotransformation reaction. The reaction was also monitored off-line by gas chromatography-mass spectrometry (GC-MS) enabling to establish a multivariate model for the infrared data based on partial least squares (PLS) regression. The method developed allowed the simultaneous determination of the substrate, two intermediates and the final product involved in the reduction reaction of 1-phenyl 1,2-propanedione at an initial concentration of 0.5% (v/v). The reaction was accomplished with a whole-cell suspension of Saccharomyces cerevisiae in a phosphate buffer of pH 3.0 at 32+/-1 degrees C. The ATR infrared monitoring was performed directly on the suspension cell without any separation process or extraction over 3h, totaling 188 spectra. The data were split into two subsets, with 158 times for calibration and 30 times for validation. The results showed that the proposed method may be used for on-line monitoring of the biotransformation reactions when the initial concentration is very low. 相似文献
67.
Tânia Cecília Trevisan Evandro Luiz Dall’Oglio Eudes da Silva Velozo Paulo Teixeira de Sousa Jr. 《Tetrahedron letters》2008,49(44):6289-6292
The phytochemical investigation of the methanol crude extract obtained from Acosmium dasycarpum (Vog.) Yakovlev root bark led to the isolation of the quinolizidine alkaloids lupanine, acosmine, acosminine and lupanacosmine, as well as the diaza-adamantane alkaloids panacosmine and dasycarpumine. Lupanacosmine (4) and dasycarpumine (6) have been described for the first time herein. 相似文献
68.
A. H. Rosa A. A. Vicente J. C. Rocha H. C. Trevisan 《Analytical and bioanalytical chemistry》2000,368(7):730-733
Invertase was immobilized on aminopropyl silica (APTS-SiO2) activated with humic substances (APTS-SiO2-HS) and on aminopropyl silica activated with glutaraldehyde (APTS-SiO2-GA). The resulting activity of both systems was compared. Humic substances (HS) used for the activation of the silica were extracted from soil of Cananéia, São Paulo State, Brazil, according to the procedure recommended by the International Humic Substances Society. Activity was determined by measuring the rate of formation of reduced sugars using the reaction with dinitrosalicylic acid (DNS). The amount of HS bound on the APTS-SiO2 was equal to 50 mg. The maximum amount of invertase immobilized on APTS-SiO2-HS was 15200 U/g while in the system APTS-SiO2-GA it was 13400 U/g. The experimental enzymatic activity was 3700 and 3300 U/g, for the systems APTS-SiO2-HS and APTS-SiO2-GA, respectively. Considering the increased amount and activity of immobilized enzyme compared with the glutaraldehyde method, it was concluded that this technique opens a new perspective in the preparation of supports for enzyme immobilization employing humic substances. 相似文献
69.
Daniel Josiane S. P. Cruz Jonas C. Catelani Tiago A. Garcia Jerusa S. Trevisan Marcello G. 《Journal of Thermal Analysis and Calorimetry》2021,143(4):3127-3135
Journal of Thermal Analysis and Calorimetry - This study aims to characterize erythromycin (ERY) estolate by thermogravimetry analysis and differential scanning calorimetry. For such a purpose,... 相似文献
70.
Jemma G. Kelly Plamen P. Angelov Júlio Trevisan Anastasia Vlachopoulou Evangelos Paraskevaidis Pierre L. Martin-Hirsch Francis L. Martin 《Analytical and bioanalytical chemistry》2010,398(5):2191-2201
Although the UK cervical screening programme has reduced mortality associated with invasive disease, advancement from a high-throughput
predictive methodology that is cost-effective and robust could greatly support the current system. We combined analysis by
attenuated total reflection Fourier-transform infrared spectroscopy of cervical cytology with self-learning classifier eClass.
This predictive algorithm can cope with vast amounts of multidimensional data with variable characteristics. Using a characterised
dataset [set A: consisting of UK cervical specimens designated as normal (n = 60), low-grade (n = 60) or high-grade (n = 60)] and one further dataset (set B) consisting of n = 30 low-grade samples, we set out to determine whether this approach could be robustly predictive. Variously extending the
training set consisting of set A with set B data produced good classification rates with three two-class cascade classifiers.
However, a single three-class classifier was equally efficient, producing a user-friendly, applicable methodology with improved
interpretability (i.e., better classification with only one set of fuzzy rules). As data from set B were added incrementally
to the training set, the model learned and evolved. Additionally, monitoring of results of the set B low-grade specimens (known
to be low-grade cervical cytology specimens) provided the opportunity to explore the possibility of distinguishing patients
likely to progress towards invasive disease. eClass exhibited a remarkably robust predictive power in a user-friendly fashion
(i.e., high throughput, ease of use) compared to other classifiers (k-nearest neighbours, support vector machines, artificial neural networks). Development of eClass to classify such datasets
for applications such as screening exhibits robustness in identifying a dichotomous marker of invasive disease progression. 相似文献