Cross Sections And Photoelectron Asymmetry Parameters For Photoionization Of H2o

The iterative Schwinger variational method is used to obtain cross sections and photoelectron asymmetry parameters for photoionization of the three outermost valence orbitals (1b1, 3a1, and 1b2) of H2O for photon energies from near threshold to 50 eV. A comparison of these calculated results with available experimental data is encouraging. © 1990 American Institute of Physics.9242362236

Microabrasion In Tooth Enamel Discoloration Defects: Three Cases With Long-term Follow-ups

Superficial irregularities and certain intrinsic stains on the dental enamel surfaces can be resolved by enamel microabrasion, however, treatment for such defects need to be confined to the outermost regions of the enamel surface. Dental bleaching and resin-based composite repair are also often useful for certain situations for tooth color corrections. This article presented and discussed the indications and limitations of enamel microabrasion treatment. Three case reports treated by enamel microabrasion were also presented after 11, 20 and 23 years of follow-ups.224347354Akin, M., Basciftci, F.A., Can white spot lesions be treated effectively? (2012) Angle Orthodontist, 82, pp. 770-775Ardu, S., Benbachir, N., Stavridakis, M., Dietschi, D., Krejci, I., Feilzer, A., A combined chemo-mechanical approach for aesthetic management of superficial enamel defects (2009) Br Dent J, 206, pp. 205-208Bailey, R.W., Christen, A.G., Effects of a bleaching technic on the labial enamel of human teeth stained with endemic dental fluorosis (1970) J Dent Res, 49, pp. 168-170Bassir, M.M., Bagheri, G., Comparison between phosphoric acid and hydrochloric acid in microabrasion technique for the treatment of dental fluorosis (2013) J Conserv Dent, 16, pp. 41-44Briso, A., Lima, A., Goncalves, R., Gallinari, M., Santos, P.D., Transenamel and transdentinal penetration of hydrogen peroxide applied to cracked or microabrasioned enamel (2014) Oper Dent, 39, pp. 166-173Castro, K.S., Araújo, F.A.C., Duarte, R.M., Sampaio, F.C., Meireles, S.S., Acceptability, efficacy and safety of two treatment protocols for dental fluorosis: A randomized clinical trial (2014) J Dent, , doi: 10.1016/j.jdent.2014.01.011. Epub ahead of printCelik, E.U., Yildiz, G., Yazkan, B., Clinical evaluation of enamel microabrasion for the aesthetic management of mild-to-severe dental fluorosis (2013) J Esthet Restor Dent, 25, pp. 422-430Celik, E.U., Yildiz, G., Yazkan, B., Comparison of enamel microabrasion with a combined approach to the esthetic management of fluorosed teeth (2013) Oper Dent, 38, pp. 134-143Chhabra, N., Singbal, K.P., Viable approach to manage superficial enamel discoloration (2010) Contemp Clin Dent, 1, pp. 284-287Croll, T.P., Enamel microabrasion for removal of superficial dysmineralization and decalcification defects (1990) J Am Dent Assoc, 120, pp. 411-415Croll, T.P., (1991) Enamel Microabrasion, , Chicago: QuintessenceCroll, T.P., Hastening the enamel microabrasion procedure eliminating defects, cutting treatment time (1993) J Am Dent Assoc, 124, pp. 87-90Croll, T.P., Bullock, G.A., Enamel microabrasion for removal of smooth surface decalcification lesions (1994) J Clin Orthod, 28 (365), p. 70Croll, T.P., Cavanaugh, R.R., Enamel color modification by controlled hydrochloric acid-pumice abrasion. I. technique and examples (1986) Quintessence Int, 17, pp. 81-87Croll, T.P., Segura, A., Donly, K.J., Enamel microabrasion: New considerations in 1993 (1993) Pract Periodontics Aesthet Dent, 5, pp. 19-28. , quiz 29Dixit, U.B., Shetty, R.M., Comparison of soft-tissue, dental, and skeletal characteristics in children with and without tongue thrusting habit (2013) Contemp Clin Dent, 4, pp. 2-6Donly, K.J., O'Neill, M., Croll, T.P., Enamel microabrasion: A microscopic evaluation of the abrosion effect (1992) Quintessence Int, 23, pp. 175-179Fragoso, L.S., Lima, D.A., Alexandre, R.S., Bertoldo, C.E., Aguiar, F.H., Lovadino, J.R., Evaluation of physical properties of enamel after microabrasion, polishing, and storage in artificial saliva (2011) Biomed Mater, 6 (3), p. 035001. , doi: 10.1088/1748-6041/6/3/035001Fujimoto, S., Yamaguchi, K., Gunjigake, K., Clinical estimation of mouth breathing (2009) Am J Orthod Dentofacial Orthop, 136 (630), p. 7Haywood, V.B., Heymann, H.O., Nightguard vital bleaching: How safe is it? (1991) Quintessence Int, 22, pp. 515-523Kendell, R.L., Hydrochloric acid removal of brown fluorosis stains: Clinical and scanning electron micrographic observations (1989) Quintessence Int, 20, pp. 837-839Killian, C.M., Conservative color improvement for teeth with fluorosis-type stain (1993) J Am Dent Assoc, 124, pp. 72-74Killian, C.M., Croll, T.P., Enamel microabrasion to improve enamel surface texture (1990) J Esthet Dent, 2, pp. 125-128Limeback, H., Vieira, A.P., Lawrence, H., Improving esthetically objectionable human enamel fluorosis with a simple microabrasion technique (2006) Eur J Oral Sci, 114, pp. 123-129Machado, L.S., Sundfeld, N.D., Oliveira, G.B., Carvalho, T.C., Oliveira, F.G., Sundfeld, R.H., Combining enamel microabrasion and dental bleaching: Recovering smile aesthetics (2013) Dent Today, 32, pp. 110-111McCloskey, R.J., A technique for removal of fluorosis stains (1984) J Am Dent Assoc, 109, pp. 63-64Murphy, T.C., Willmot, D.R., Rodd, H.D., Management of postorthodontic demineralized white lesions with microabrasion: A quantitative assessment (2007) Am J Orthod Dentofacial Orthop, 131, pp. 27-33Nahsan, F.P., Silva, L.M., Baseggio, W., Franco, E.B., Francisconi, P.A., Mondelli, R.F., Conservative approach for a clinical resolution of enamel white spot lesions (2011) Quintessence Int, 42, pp. 423-426Paula, A., Santos, P.H., Oliveira, F.G., Machado, L.S., Neto, D.S., Sundfeld, R.H., Integrating techniques to restore an adolescent's smile (2012) Dent Today, 31 (88), pp. 90-91Price, R.B., Loney, R.W., Doyle, M.G., Moulding, M.B., An evaluation of a technique to remove stains from teeth using microabrasion (2003) J Am Dent Assoc, 134, pp. 1066-1071Reston, E.G., Corba, D.V., Ruschel, K., Tovo, M.F., Barbosa, A.N., Conservative approach for esthetic treatment of enamel hypoplasia (2011) Oper Dent, 36, pp. 340-343Rodrigues, M.C., Mondelli, R.F., Oliveira, G.U., Franco, E.B., Baseggio, W., Wang, L., Minimal alterations on the enamel surface by micro-abrasion: In vitro roughness and wear assessments (2013) J Appl Oral Sci, 21, pp. 112-117Segura, A., Donly, K.J., Wefel, J.S., Drake, D., Effect of enamel microabrasion on bacterial colonization (1997) Am J Dent, 10 (272), p. 4Sheoran, N., Garg, S., Damle, S.G., Dhindsa, A., Opal, S., Gupta, S., Esthetic management of developmental enamel opacities in young permanent maxillary incisors with two microabrasion techniques a split mouth study (2014) J Esthet Restor Dent, , doi: 10.1111/jerd.12096. Epub ahead of printSundfeld, R.H., Croll, T.P., Briso, A.L., Alexandre, R.S., Sundfeld, N.D., Considerations about enamel microabrasion after 18 years (2007) Am J Dent, 20, pp. 67-72Sundfeld, R.H., Rahal, V., Croll, T.P., de Alexandre, R.S., Briso, A.L., Enamel microabrasion followed by dental bleaching for patients after orthodontic treatment case reports (2007) J Esthet Restor Dent, 19, pp. 71-77Yamaguchi, K., Morimoto, Y., Nanda, R.S., Ghosh, J., Tanne, K., Morphological differences in individuals with lip competence and incompetence based on electromyographic diagnosis (2000) J Oral Rehabil, 27, pp. 893-90

The Atp-dependent Rna Helicase Hrpb Plays An Important Role In Motility And Biofilm Formation In Xanthomonas Citri Subsp. Citri

Background: RNA helicases are enzymes that catalyze the separation of double-stranded RNA (dsRNA) using the free energy of ATP binding and hydrolysis. DEAD/DEAH families participate in many different aspects of RNA metabolism, including RNA synthesis, RNA folding, RNA-RNA interactions, RNA localization and RNA degradation. Several important bacterial DEAD/DEAH-box RNA helicases have been extensively studied. In this study, we characterize the ATP-dependent RNA helicase encoded by the hrpB (XAC0293) gene using deletion and genetic complementation assays. We provide insights into the function of the hrpB gene in Xanthomonas citri subsp. citri by investigating the roles of hrpB in biofilm formation on abiotic surfaces and host leaves, cell motility, host virulence of the citrus canker bacterium and growth in planta. Results: The hrpB gene is highly conserved in the sequenced strains of Xanthomonas. Mutation of the hrpB gene (Δ;hrpB) resulted in a significant reduction in biofilms on abiotic surfaces and host leaves. Δ;hrpB also exhibited increased cell dispersion on solid medium plates. Δ;hrpB showed reduced adhesion on biotic and abiotic surfaces and delayed development in disease symptoms when sprayed on susceptible citrus leaves. Quantitative reverse transcription-PCR assays indicated that deletion of hrpB reduced the expression of four type IV pili genes. The transcriptional start site of fimA (XAC3241) was determined using rapid amplification of 5′-cDNA Ends (5′RACE). Based on the results of fimA mRNA structure predictions, the fimA 5′ UTR may contain three different loops. HrpB may be involved in alterations to the structure of fimA mRNA that promote the stability of fimA RNA. Conclusions: Our data show that hrpB is involved in adherence of Xanthomonas citri subsp. citri to different surfaces. In addition, to the best of our knowledge, this is the first time that a DEAH RNA helicase has been implicated in the regulation of type IV pili in Xanthomonas. © 2016 Granato et al.16

Body Mass Index Percentiles In Adolescents Of The City Of São Paulo, Brazil, And Their Comparison With International Parameters [ppercentis Do índice De Massa Corporal De Adolescentes Na Cidade De São Paulo, Brasil, E Sua Comparação Com Parâmetros Internacionais]

Objective: To describe the percentile distribution of body mass index (BMI) in school adolescents, by gender and age, comparing them with international parameters. Subjects and methods: The study included 8,020 adolescents aged 10-15 years from 43 schools in the city of São Paulo, southeastern Brazil. BMI values of the study sample were distributed in percentiles and compared to international parameters (CDC, Must and cols. and Cole and cols.). Results: Both male and female adolescents aged 10 to 14 years showed BMI cut-offs over the international parameters, especially in the P50-P85 percentile range. At the age of 15, the observed values were very similar to reference data; however, BMI values in the 95th percentile were much higher than international parameters. Conclusions: The study results show how important it is to use adequate BMI values for Brazilian adolescents aged 10-15 since international parameters may not reflect the actual nutritional status of this group.543295302Bini, V., Celi, F., Berioli, M.G., Bacosi, M.L., Stella, P., Giglio, P., Body mass index in children and adolescents according to age and pubertal stage (2000) Eur J Clin Nutr, 54 (3), pp. 214-218Pietrobelli, A., Faith, M.S., Allison, D.B., Gallagher, D., Chiumello, G., Heymsfield, S.B., Body mass index as a measure of adiposity among children and adolescents: A validation Study (1998) J Pediatr, 132 (2), pp. 204-210Mei, Z., Grummer, S.L.M., Pietrobelli, A., Goulding, A., Goran, M.I., Dietz, W.H., Validity of body mass index compared with other body-com-position screening indexes for the assessment of body fatness in children and adolescents (2002) Am J Clin Nutr, 75 (6), pp. 978-985Cardiovascular Diseases, , WHO Expert Committee on Hypertension Control., Geneva1994/2001Belizzi, M.C., Dietz, W.H., Workshop on childhood obesity: Summary of the discussion (1999) Am J Clin Nutr, 70 (1), pp. 173S-5SEbbeling, C.B., Pawlak, D.B., Ludwig, D.S., Childhood obesity: Publichealth crisis, common sense cure (2002) Lancet, 360 (9331), pp. 473-482Wang, Y., Wang, J.Q., A comparison of international references for the assessment of child and adolescent overweight and obesity in different populations (2002) Eur J Clin Nutr, 56 (10), pp. 973-982Jelliffe, D.B., The assessment of the nutritional status of the community (1966) WHO Monograph, 53. , Geneva(1971) CDC Growth Charts: United States, , www.cdc.gov/growthcharts, CDC - Center for disease control and prevention. 2000, [online] Hyaltsville: 2002. Accessed on: Jan 15 2003. Available from, 10. Conover WJ. Practical nonparametric statistics. New York: John Wiley & Sons;Siegel, S., (1975) Estatística Não-paramétrica Para As Ciências Do Comportamento, , São Paulo: MC Graw-HillMiliken, G.A., Johnson, D.E., (1984) Analysis of Messy Data. Designed Experiments, 1. , New York: Van Nostrand Reinhold CompanyMontgomery, D.C., (1991) Design and Analysis of Experiments, , 3th ed. New York: John Wiley SonsCole, T.J., Bellizzi, M.C., Flegal, K.M., Dietz, W.H., Establishing a standard definition for child overweight and obesity worldwide: International Survey (2000) BMJ, 320, pp. 1240-1243Must, A., Dallal, G.E., Dietz, W.H., Reference data for obesity: 85th and 95th percentiles of body mass index (WT/Th2) and triceps skinfold thickness (1991) Am J Clin Nutr, 53 (4), pp. 839-846Baker, J.L., Olsen, L.W., Sørensen, T.I.A., Childhood body mass index and the risk of coronary heart disease in adulthood (2007) N Engl J Med, 357, pp. 2329-2337Thompson, D.R., Obarzanek, E., Franko, D.L., Barton, B.A., Morison, J., Biro, F.M., Childhood overweight and cardiovascular disease risk factors: The National Heart, Lung, and Blood Institute Growth and Health Study (2007) J Pediatr, 150 (1), pp. 18-25Rosa, M.L., Mesquita, E.T., Rocha, E.R., Fonseca, V.M., Body mass index and waist circumference as markers of arterial hipertension in adolescents (2007) Arq Bras Cardiol, 88 (5), pp. 573-578Morrison, J.A., Friedman, L.A., Graymcguire, C., Metaboblic syndrome in childhood predicts adult cardiovascular disease 25 years later: The princeton lipid research clinics follow-up study (2007) Pediatrics, 120 (2), pp. 340-345Mohan, V., Deepa, M., Farooq, S., Narayan, K.M.V., Datta, M., Deepa, R., Anthropometric cut points for identification of cardiometabolic risk factors in an urban Asian Indian population (2007) Metabolism, 56, pp. 961-968Morrison, J.A., Friedman, L.A., Wang, P., Glueck, C.J., Metabolic syndrome in childhood predicts adult metabolic syndrome and type 2 diabetes mellitus 25 to 30 years later (2008) J Pediatr, 152, pp. 201-206Bray, G.A., Jablonski, K.A., Fujimoto, W.Y., Cannor, E.B., Haffner, S., Hanson, R.L., Relation of central adiposity and body mass index to the development of diabetes in the Diabetes Prevention Program (2008) Am J Clin Nutr, 87 (5), pp. 1212-1218Denney, W.E., Hardy, L.L., Dobbins, T., Okely, A.D., Baur, L.A., Body mass index, waist circumference and chronic disease risk factors in Australian adolescents (2008) Arch Pediatr Adolesc Med, 162 (6), pp. 566-573Santos, L.C., Cintra, I.P., Fisberg, M., Martini, L.A., Body trunk fat and insulin resistance in post pubertal obese adolescents (2008) Med J, 126 (2), pp. 82-86Messiah, S.E., Arheart, K.L., Lpshultz, S.E., Miller, T.L., Body Mass Index, waist circumference, and cardiovascular risk factors in adolescents (2008) J Pediatr, 153 (6), pp. 845-850Lawlor, D.A., Hart, C.L., Hole, D.J., Davey, S.G., Reverse causality and confounding and the associations of overweight and obesity with mortality (2006) Obesity, 14, pp. 2294-2304Gelber, R.P., Kurth, T., Manson, J.E., Buring, J.E., Gaziano, J.M., Body mass index and mortality in men: Evaluating the shape of the association (2007) Int J Obes, 31 (8), pp. 1240-1247Cole, T.J., Roede, M.J., Centiles of body mass index for dutch children aged 0-20 years in 1980 - a baseline to assess recent trends in obesity (1999) Ann Hum Biol, 26 (4), pp. 303-308Luciano, A., Bressan, F., Zoppi, G., Body mass index reference curves for children aged 3-19 years from Verona, Italy (1997) Eur J Clin Nutr, 51, pp. 6-10Turconi, G., Guarcello, M., Maccarini, L., Bazzano, R., Zaccardo, A., Roggi, C., BMI values and other anthropometric and functional mea surements as predictors of obesity in a selected group of adolescents (2006) Eur J Nutr, 45, pp. 136-143Guillaume, M., Defining obesity in childhood: Current practice (1999) Am J Clin Nutr, 70, pp. 126S-30SLivingstone, M.B., Childhood obesity in Europe: A growing concern (2001) Public Health Nutr, 4, pp. 109-116Obesity: Preventing and managing the global epidemic (1998) Report of WHO Consultation On Obesity. 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Studies Of The Photoionization Cross Sections Of Ch4

We present cross sections and asymmetry parameters for photoionization of the 1t2 orbital of CH4 using static-exchange continuum orbitale of CH4 + to represent the photoelectron wave function. The calculations are done in the fixed-nuclei approximation at a single internuclear geometry. To approximate the near-threshold behavior of these cross sections, we assumed that the photoelectron spectrum is a composite of three electronic bands associated with the Jahn-Teller components of the distorted ion. The resulting cross sections reproduce the sharp rise seen at threshold in the experimental data and are in good agreement with experiment at higher energy. The agreement between the calculated and measured photoelectron asymmetry parameters is, however, less satisfactory. © 1988 American Institute of Physics.8952998300

Application Of The Method Of Continued Fractions To Multichannel Studies On Electronic Excitation Of H2 By Electron Impact

In the present work, the method of continued fractions at a five-channel close-coupling level of approximation is applied to study the low-energy electron-impact excitation in linear molecules. Particularly, cross sections for the X1Σg +→b3Σ u +,X1Σg +→a3Σg +, and X1Σg +→c3Πu transitions in H2 in the (15-40)-eV energy range are reported. As in our early two-state studies, no orthogonality constraint between the bound and continuum orbitals is imposed and the one-electron exchange terms are considered explicitly. In general, our calculated cross sections are in good agreement with the results obtained by the four-state Kohn variational method. Comparison between our calculated results with available experimental data is encouraging. ©2001 The American Physical Society.63316Pitchford, L., McKoy, V., Chutjian, A., Trajmar, S., (1986) Proceedings of the Meeting of the Fourth International Swarm and the Inelastic Electron-Molecule Collisions Symposium, , Swarm Studies and Inelastic Electron-Molecule Collisions, edited by L. Pitchford, V. McKoy, A. Chutjian, and S. Trajmar Springer-Verlag, New YorkBaluja, K.L., Noble, C.J., Tennyson, J., (1985) J. Phys. B, 18, pp. L851Schneider, B.I., Collins, L.A., (1985) J. Phys. B, 18, pp. L857Lima, M.A.P., Gibson, T.L., Huo, W.M., McKoy, V., (1985) J. Phys. B, 18, pp. L865Pritchard, H.P., McKoy, V., Lima, M.A.P., (1990) Phys. Rev. A, 41, p. 546Rescigno, T.N., Schneider, B.I., (1992) Phys. Rev. A, 45, p. 2894Sun, Q., Winstead, C., McKoy, V., Lima, M.A.P., (1992) J. Chem. Phys., 96, p. 3531Lee, M.-T., Fujimoto, M.M., Kroin, T., Iga, I., (1996) J. Phys. B, 29, pp. L425Lee, M.-T., Fujimoto, M.M., Iga, I., (1998) J. Mol. Struct.: THEOCHEM, 432, p. 197Branchett, S.E., Tennyson, J., Morgan, L.A., (1990) J. Phys. B, 23, p. 4625Branchett, S.E., Tennyson, J., Morgan, L.A., (1991) J. Phys. B, 24, p. 3479Parker, S.D., McCurdy, C.W., Rescigno, T.N., Lengsfield III, B.H., (1991) Phys. Rev. A, 43, p. 3514Sartori, C.S., Lima, M.A.P., (1995) Scientific Program and Abstract of Contributed Papers, XIX ICPEAC, p. 28. , edited by J. B. A. Mitchell, J. W. McConkey, and C. E. Brion Whistler, CanadaLee, M.-T., Iga, I., Fujimoto, M.M., Lara, O., (1995) J. Phys. B, 28, pp. L299Lee, M.-T., Iga, I., Fujimoto, M.M., Lara, O., (1995) J. Phys. B, 28, p. 3325Horacek, J., Sasakawa, T., (1983) Phys. Rev. A, 28, p. 2151Horacek, J., Sasakawa, T., (1984) Phys. Rev. A, 30, p. 2274Fano, U., Dill, D., (1972) Phys. Rev. A, 6, p. 185Fliflet, A.W., McKoy, V., (1980) Phys. Rev. A, 21, p. 1863Goddard III, W.A., Hunt, W.J., (1974) Chem. Phys. Lett., 24, p. 464Huzinaga, S., (1965) J. Chem. Phys., 42, p. 1293Kolos, W., Roothaan, C.C.J., (1960) Rev. Mod. Phys., 32, p. 219Lima, M.A.P., Gibson, T.L., McKoy, V., Huo, W.M., (1988) Phys. Rev. A, 38, p. 4527Khakoo, M.A., Trajmar, S., (1986) Phys. Rev. A, 34, p. 146Nishimura, H., Danjo, A., (1986) J. Phys. Soc. Jpn., 55, p. 303

Stokes Parameters And Rovibrationally Resolved Cross Sections For The X1∑g +(v = 0, N = 1) → D3iiu -(v = 0, N = 1) Excitation In H2

We report for the first time the calculation of Stokes parameters and state-to-state rovibrationally resolved differential cross sections for the excitation X1∑g +(v = 0, N = 1) → d3IIu -(v = 0, N = 1) in H2 by electron impact at 25 eV. Comparison with the only available experimental data is encouraging.71111701170

Exploring nu signals in dark matter detectors

We investigate standard and non-standard solar neutrino signals in direct dark matter detection experiments. It is well known that even without new physics, scattering of solar neutrinos on nuclei or electrons is an irreducible background for direct dark matter searches, once these experiments each the ton scale. Here, we entertain the possibility that neutrino interactions are enhanced by new physics, such as new light force carriers (for instance a "dark photon") or neutrino magnetic moments. We consider models with only the three standard neutrino flavors, as well as scenarios with extra sterile neutrinos. We find that low-energy neutrino--electron and neutrino--nucleus scattering rates can be enhanced by several orders of magnitude, potentially enough to explain the event excesses observed in CoGeNT and CRESST. We also investigate temporal modulation in these neutrino signals, which can arise from geometric effects, oscillation physics, non-standard neutrino energy loss, and direction-dependent detection efficiencies. We emphasize that, in addition to providing potential explanations for existing signals, models featuring new physics in the neutrino sector can also be very relevant to future dark matter searches, where, on the one hand, they can be probed and constrained, but on the other hand, their signatures could also be confused with dark matter signals.Comment: 38 pages, 8 figures, 1 table; v3: eq 3 and nuclear recoil plots corrected, footnote added, conclusions unchange