Miracle-dz/UniFAR-FTUs huggingface dataset:
Développement de nouvelles méthodes séparatives compatibles avec une détection par spectrométrie de masse et par électrochimie pour l'analyse des traces de catécholamines et molécules apparentées

Les catecholamines et les indolamines font partie de la famille des neurotransmetteurs. Un desequilibre dans leur concentration peut etre associe a differentes maladies telles les maladies de Parkinson et Alzheimer, la depression ou la schizophrenie. C'est pourquoi le developpement de methodes de dosage specifiques et tres sensibles du fait de leurs tres faibles teneurs dans les fluides biologiques est necessaire. Dans un premier temps nous avons developpe une methode chromatographique en appariement d'ions (IP-LC) utilisant des colonnes C18 de nouvelle generation (monolithique et « fused core ») et l'acide nonafluoropentanoique, comme agent d'appariement d'ions volatil. Cette methode est compatible avec une detection SM en mode d'ionisation positive. Dans un deuxieme temps, differents systemes en mode HILIC ont ete evalues. Le choix raisonne de la phase stationnaire offrant la meilleure separation du melange de catecholamines a pu etre realise apres avoir teste l'influence sur la separation des differents groupements fonctionnels disponibles : groupement soit neutre (greffage diol, amide, ou cyano), soit positivement charge (greffage amino ou triazole) soit negativement charge (silice vierge avec particules totalement poreuses ou partiellement poreuses « fused core ») ou zwitterionique (greffage sulfobetaine). La methode HILIC presente l'avantage d'etre compatible aussi bien avec une detection SM en mode d'ionisation positive que negative. Les deux methodes (IP-LC et HILIC) ont ete comparees en termes de resolution, efficacite et limites de detection (LOD), linearite et repetabilite. Les LODs obtenues sont comprises entre 1 et 100 ng.mL-1. Pour pouvoir doser des teneurs plus faibles, une methode de pre-concentration de l'echantillon a ete developpee en associant 2 supports differents (Oasis HLB et PGC). La methode optimisee SPE-CPL-MS/MS a ete enfin appliquee a un extrait de cerveau de mouton.
High power factor single-stage ZVS charger with coupled inductors

This paper presents a zero voltage switching (ZVS) single-stage charger with power factor correction (PFC) based on an asymmetrical half-bridge topology and coupled inductors. The proposed charger is formed from a PFC converter and an asymmetrical half-bridge converter. Coupled inductors are adopted to reduce input current ripple caused by asymmetrical PWM operation, resulting in small input filters: The converter has the features of constant frequency operation, ZVS and low voltage stress imposed on the active switches. Moreover, it can achieve high power factor, high power density, high efficiency, low switching loss and low component count, which make converter operation at medium power levels feasible. In the paper, theoretical analysis and experimental results for a charger with the proposed topology have been obtained, which verify its feasibility.
Determination of Cobalt in Water by Thermal Lens Spectrometry with Cloud Point Extraction

A novel method is reported for the determination of cobalt using thermal lens spectrometry with cloud point extraction using 2-(3,5-dichloro-2-pyridylazo)-5-dimethylaminoaniline as the chelating agent and octylphenoxypolyethoxyethanol (Triton X-114) as the extractant. Optimized conditions for cloud point extraction included a pH of 5.0 in acetic acid/sodium acetate buffer, 4.0 × 10−6 molar of the chelating agent, 0.08 percent Triton X-114 (w/v), and equilibration for twenty minutes at 60 degrees Celsius. After separation, the surfactant-rich phase was dissolved in 0.45 milliliter of 2 molar HCl-ethanol for determination. A single mode helium:neon laser at 632.8 nanometers was used for excitation and as the probe. Using the optimized conditions, a linear calibration curve was obtained from 0.2 to 4 nanograms per milliliter cobalt and the limit of detection was 0.02 nanogram per milliliter. The sensitivity was enhanced by approximately 500-fold compared to conventional spectrophotometry. The method was used for the determination of cobalt in water.
Symmetry and spectroscopy : an introduction to vibrational and electronic spectroscopy

Symmetry And Spectroscopy An Introduction To Vibrational And Electronic Spectroscopy *FREE* symmetry and spectroscopy an introduction to vibrational and electronic spectroscopy Vibronic spectra involve simultaneous changes in the vibrational and electronic energy states of a molecule. In the gas phase vibronic transitions are accompanied by changes in rotational energy also.Vibronic spectroscopy Wikipedia Vibronic spectra involve simultaneous changes in the vibrational and electronic energy states of a molecule In the gas phase vibronic transitions are accompanied by changes in rotational energy also Mössbauer spectroscopy Wikipedia Mössbauer spectroscopy is a spectroscopic technique based on the Mössbauer effect This effect discovered by Rudolf Mössbauer also Moessbauer German Mößbauer in 1958 consists in the nearly recoil free resonant absorption and emission of gamma rays in solids ULTRAVIOLET AND VISIBLE SPECTROSCOPY ? Introduction The molecular spectroscopy is the study of the interaction of electromagnetic waves and matter The scattering of sun’s rays by raindrops to produce a rainbow and appearance of a colorful Infrared spectroscopy of proteins ScienceDirect
Advances in Immobilized Organocatalysts for the Heterogeneous Asymmetric Direct Aldol Reactions

The aim of this article is to collect the results published from the beginning (2000) on asymmetric direct aldol reactions taking place in the presence of immobilized chiral organocatalysts. The seven groups of organocatalysts discussed are: asymmetric direct aldol reactions catalyzed by: (1) covalently bonded immobilized hydroxyproline organocatalysts; (2) covalently bonded immobilized prolinamide organocatalysts; (3) covalently bonded immobilized peptide organocatalysts; (4) other covalently bonded immobilized chiral organocatalysts; (5) chiral organocatalysts bonded by ionic groups; (6) chiral organocatalysts with adsorptive bonding; and (7) other types of immobilized chiral organocatalysts. The main objective of this article based on results obtained by using about 360 immobilized organocatalysts, to bring to the focus of catalyst systems in which the aldol reactions yield beta-hydroxyketones of maximal optical purity, while keeping catalyst concentrations and reaction times as low and as short as possible. Trends recognized in data obtained in this field of investigation may mark out further tasks for the purpose of practical application.
Optical methods for surface measurements : state of the art

Die Einsatzgebiete der optischen Mestechnik haben sich durch die Einfuhrung entsprechender Bildverarbeitung ausgeweitet. Neben der Triangulation und den Moire-Verfahren bieten sich interferometrische Verfahren fur die hochgenaue Messung an; ein groses Potential, das noch nicht voll ausgenutzt wird. Ansatze zur Reduzierung der Storanfalligkeit, aber auch der Auflosung werden diskutiert. Different optical methods can be used for distance and topography measurement. The range and sensitivity need to be selected. The methods are contactless and fast. Interferometric methods are sometimes, however too sensitive with respect to environmental disturbances and roughness of technical objects. Furthermore surface roughness leads to unwanted speckles to be taken care of by the analysis and information processing. Methods will be developement measure topography of optically rough surfaces. Obligue incidence and 2λ interferometry are possibilities to overcome some of the limitations.
Medical imaging: state of the art and future development

An overview on medical imaging techniques is given from an algorithmic point of view. The mathematical framework, inverse problems and regularization, is sketched. The radon transform serves as mathematical model for studying resolution, noise amplification and inversion methods in reconstruction problems. The imaging techniques discussed are X-ray computer tomography, magnetic resonance imaging, ultrasound tomography, impedance computer tomography, diffuse tomography, biomagnetism and emission computer tomography as single-particle emission tomography and positron emission tomography. There are close connections to nondestructive evaluation.
Multidrug-resistant Escherichia coli and Salmonella spp. isolated from pigeons

Background and Aim: Pigeon rearing has been gaining popularity for recent years. They are reared remarkably very close to the house of the owner. This activity, therefore, may pose potential threats for humans as well as other animals as pigeons may carry and spread different pathogens including drug-resistant bacteria. This study was conducted to explore the prevalence of Escherichia coli and Salmonella spp. as well as their antibiogram profile along with an association analysis. Materials and Methods: Forty swab samples were collected from 20 pigeons during the study. E. coli and Salmonella spp. were isolated and identified on various types of agars, including MacConkey, Eosin methylene blue, Brilliant green, and Salmonella-Shigella agar. Biochemical tests such as the carbohydrate fermentation test, the triple sugar iron agar slant reaction, the indole test, the methyl red test, the catalase test, as well as the Voges–Proskauer test were also performed. Besides, the presence of E. coli was further confirmed by polymerase chain reaction (PCR). Moreover, antimicrobial susceptibility testing of the isolates was performed against nine antibiotics from seven classes on the Mueller-Hinton agar based on the Kirby–Bauer disk diffusion method. Results: The overall prevalence of E. coli and Salmonella spp. was 52.5 and 27.5%, respectively. The prevalence of the pathogenic E. coli was 61.90%. The antibiogram profile of 21 E. coli as well as 11 Salmonella spp. revealed that all isolates, except one, were resistant to one to six antibiotics. Around 61.90%, 71.43%, 23.81%, 61.90%, 23.81%, 19.05%, and 52.38% of E. coli showed resistance against amoxicillin, ampicillin, azithromycin, erythromycin, nalidixic acid, gentamicin, and tetracycline, respectively. Furthermore, E. coli resistance was not observed in case of ciprofloxacin and levofloxacin. Similarly, around 36.36%, 27.27%, 27.27%, 45.45%, 81.82%, 100%, and 18.18% of the Salmonella spp. showed resistance against amoxicillin, ampicillin, azithromycin, erythromycin, nalidixic acid, tetracycline, and levofloxacin, respectively. However, all Salmonella spp. (100%) were found to show sensitivity against ciprofloxacin and gentamicin. Multidrug-resistant (MDR) E. coli (23.80%) and Salmonella spp. (54.54%) were also isolated. Furthermore, both positive (odds ratio [OR] >1) and negative (OR <1) drug resistance associations, with a higher frequency of positive associations, were found in E. coli. A significant positive association was observed between ampicillin and amoxicillin (OR: 81.67, 95% confidence interval: 2.73-2447.57, p=0.01). Conclusion: Pigeon carrying MDR E. coli and Salmonella spp. may contribute to the transmission and spread of these microorganisms. Therefore, strict hygienic measures should be taken during the farming of pigeons to decrease the potential transmission of E. coli and Salmonella spp. from pigeon to humans as well as other animals. So far, this is the first report of the PCR-based identification of pathogenic E. coli from pigeons in Bangladesh.
The combined effect of magnetic and electric fields using on/off infrared light on the blood sugar level and the diameter of Langerhans islets of diabetic mice

Background and Aim: At present, diabetes is treated with oral antidiabetic medicines, such as sulfonylureas and thiazolidine, as well as insulin injection. However, these methods have several shortcomings. Therefore, alternatives for treating diabetes mellitus (DM) are needed. This study aims to determine the combined effect of magnetic and electric fields on blood sugar levels and the diameter of Langerhans islets of diabetic mice. Materials and Methods: Induction of DM in mice was carried out by administering lard for 2 weeks and continued with an intraperitoneal injection of streptozotocin, dissolved in a 4.5 pH citrate buffer, and administered in a dose of 30 mg/kg bodyweight for 5 days. Treatments were used in combination with magnetic and electric fields using on/off infrared light. Blood samples were pipetted through the tip of mice’s tails to establish the blood sugar level for each individual mouse. Histology preparation of the pancreas organ was affected using the histology standard as well as hematoxylin and eosin staining methods. Langerhans islet diameter data were analyzed using analysis of variance followed by Duncan’s multiple range test. Data analysis was performed at ssssssss=0.05. Results: The results showed that the combined treatment of permanent magnetic and unidirectional electric fields (PS) caused changes in blood sugar levels that were not significantly different from the normal control group. The PS treatment improved the diameter of the Langerhans islets but not to a significant degree compared to other treatments. Conclusion: The use of PS treatment is effective for reducing the blood sugar levels of diabetic mice and improving the diameter of their Langerhans islets.
Pengaruh Pemberian Kapur dan Kompos Sisa Tanaman terhadap Aluminium Dapat Ditukar dan Produksi Tanaman Kedelai pada Tanah Vertic Hapludult dari Gajrug, Banten

Ultisol is a soil type with the widest distribution in Indonesia. However, ultisol is characterized with acid reaction and low content of organic matter and nutrients. Ultisol contains a high concentration of Al at a level that can interfere plant growth. The objective of this study was to evaluate the effect of lime and crop residue composts application on the activities of exch-Al and the soybean yield. A greenhouse experiment using Vertic Hapludult from Gajrug, Banten was conducted in a completely randomized design. Liming treatments with 0.0 and 20.7 tons/ha (equals to 1x exch-Al) were combined with the application of different crop residue compost from upland rice, corn, soybean and peanut. The dose of the compost at 0, 1 and 2% organic-C. In this study, soybean was used as the indicator plant. The results of this experiment indicated that the application of lime equal 1x exch-Al significantly decreased exch-Al and resulted in good plant growth and soybean yield. Application of different types of crop residue compost decreased exch-Al. On the unlimed and limed soils the application of upland rice residue compost at dose of 2% organic-C (D 2 ) increased soybean yield (23.21 g/pot and 25.67 g/pot), 72.53% and 1.87% respectively. Key words : Liming, crop residue compost, exchangeable aluminum (exch-Al), soybean
Rainbow's End: Irish-Americans and the Dilemmas of Urban Machine Politics, 1840–1985 . By Erie Steven P.. Berkeley University of California Press, 1988. 374p. $27.50.

scholars and politicians approached political communication as simply a task of the movement of information" [p. 42]), but is hardly ever well supported by evidence. Much of the book reads, in fact, as if illustrations, qualifications, clarifications, and evidence had been systematically edited out. Presidential Debates debates. The Primetime Presidency often seems to be striving for the arresting "sound bites" that it deplores.
A2163: AN EXCEPTIONALLY HOT CLUSTER OF GALAXIES

Extensive observations of A2163, both in the optical and X-ray bands, are reported. The cluster displays a high temperature, gas and total mass as well as a strong optical luminosity and a large galaxy content and velocity dispersion. There is some evidence that this cluster is in a non-relaxed state.
The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate

We review measured rates of soil respiration from terrestrial and wetland ecosystems to define the annual global CO 2 flux from soils, to identify uncertainties in the global flux estimate, and to investigate the influences of temperature, precipitation, and vegetation on soil respiration rates. The annual global CO 2 flux from soils is estimated to average (± S.D.) 68 ± 4 PgC/ yr, based on extrapolations from biome land areas. Relatively few measurements of soil respiration exist from arid, semi-arid, and tropical regions; these regions should be priorities for additional research. On a global scale, soil respiration rates are positively correlated with mean annual air temperatures and mean annual precipitation. There is a close correlation between mean annual net primary productivity (NPP) of different vegetation biomes and their mean annual soil respiration rates, with soil respiration averaging 24% higher than mean annual NPP. This difference represents a minimum estimate of the contribution of root respiration to the total soil CO 2 efflux. Estimates of soil C turnover rates range from 500 years in tundra and peaty wetlands to 10 years in tropical savannas. We also evaluate the potential impacts of human activities on soil respiration rates, with particular focus on land use changes, soil fertilization, irrigation and drainage, and climate changes. The impacts of human activities on soil respiration rates are poorly documented, and vary among sites. Of particular importance are potential changes in temperatures and precipitation. Based on a review of in situ measurements, the Q 10 value for total soil respiration has a median value of 2.4. Increased soil respiration with global warming is likely to provide a positive feedback to the greenhouse effect. DOI: 10.1034/j.1600-0889.1992. t01-1-00001.x
Metamathematical investigations of a calculus of constructions

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Metamathematical investigations of a calculus of constructions T. Coquand
In Vitro Alternatives for Ocular Safety Testing: An Outline of Assays and Possible Future Developments

An increasing number of in vitro tests are being proposed as alternatives for animals in ocular safety testing. These in vitro systems use a variety of approaches and measure a broad range of endpoints, including cellular cytotoxicity and metabolism. We will briefly review the development and validation of these model systems. Several tests appear promising, and may prove useful as adjuncts in our current ocular safety assessment schemes. We will also discuss how these tests can most rapidly be brought to use in ocular safety assessment, and where efforts should be directed to develop more-highly predictive in vitro model systems for the future.
Identification of tetragonal and cubic structures of zirconia using synchrotron x-radiation source

X-ray diffraction from a synchrotron source was employed in an attempt to identify the crystal structures in zirconia ceramics produced by the sol-gel method. The particles of chemically precipitated zirconia, after calcination below 600 °C, are very fine, and have a diffracting particle size in the range of 7-15 nm. As the tetragonal and cubic structures of zirconia have similar lattice parameters, it is difficult to distinguish between the two. The tetragonal structure can be identified only by the characteristic splittings of the Bragg profiles from the “c” index planes. However, these split Bragg peaks from the tetragonal phase in zirconia overlap with one another due to particle size broadening. In order to distinguish between the tetragonal and cubic structures of zirconia, three samples were studied using synchrotron radiation source. The results indicated that a sample containing 13 mol% yttria-stabilized zirconia possessed the cubic structure with a _0 = 0.51420 ± 0.00012 nm. A sample containing 6.5 mol% yttria stabilized zirconia was found to consist of a cubic phase with a _0 = 0.51430 ± 0.00008 nm. Finally, a sample which was precipitated from a pH 13.5 solution was observed to have the tetragonal structure with a _0 = 0.51441 ± 0.00085 nm and c _0 = 0.51902 ± 0.00086.
Cohesive‐energy‐density of high polymers. Part IV. C. E. D. of Polyacrylates

The solubility parameters of polymethyl, -ethyl, -propyl, and -butyl acrylates were estimated by measuring their solution viscosities in a series of alkyl ester solvents. The results agreed well with those obtained by swelling measurements and it was observed that in the homologous series, c.e. d.8 decreases with increase in the alcoholic chain length. Die Loslichkeitsparameter von Polyacrylsauremethyl-, -athyl-, -propyl- und -butylester wurden mittels Messungen ihrer Losungsviskositaten in einer Reihe von Alkylestern als Losungsmittel bestimmt. Die Ergebnisse stimmen gut mit jenen uberein, die man uber Quellungsmessungen erhielt. Es wurde beobachtet, das in einer homologen Reihe die Kohasionsenergiedichten mit zunehmender Kettenlange des Alkohols abnehmen.
Ammonia selective catalytic reduction of NO over Ce–Fe/Cu–SSZ-13 catalysts

A series of CHA-type trimetallic composite zeolites of Cex–Fey/Cu–SSZ-13 catalysts were prepared using Cu–SSZ-13, synthesized in a one-pot procedure, and subsequent ion-exchange with Fe3+ and Ce3+. The catalysts were characterized including TEM, XRD, XPS, SEM and BET. Their catalytic performances for selective catalytic reduction of NO with NH3 were investigated. The results of XRD revealed that the crystal structure of zeolite Ce–Fe/Cu–SSZ-13 is the same as Cu–SSZ-13. It is known from the results of BET and catalytic performance tests that larger specific surface areas and smaller pore size favor a catalytic reaction. Among the prepared Cex–Fey/Cu–SSZ-13 catalysts, Ce0.017–Fe0.017/Cu–SSZ-13 displayed the best SCR performance. The NO conversion was more than 90% between 200 and 500 °C. N2 selectivity was above 98% within the wider temperature range of 150–550 °C. In addition, the catalyst demonstrated sulfur–water tolerance and effective resistance against high space velocity. The phenomena suggest that synergistic effects of Cu, Fe and Ce species improve the SCR performances and make the Ce–Fe/Cu–SSZ-13 catalyst a promising candidate for NH3–SCR technology.
Lidar observations of the horizontal orientation of ice crystals in cirrus clouds

A scanning lidar system has been used at Aberystwyth (52.4°N, 4.1°W) to measure the backscatter and depolarization ratios in cirrus clouds. The measurements indicate that the height of maximum occurrence was near 9 km and that about 50% of clouds showed the presence at some height of ice crystals having a near horizontal orientation. The angular dependence of the backscatter about the vertical showed that the maximum tilt angle of these crystals from the horizontal plane was about 0.3°. DOI: 10.1034/j.1600-0889.1990. 00001.x-i1