926 research outputs found
Fine-needle Aspiration Biopsy For Breast Lesions: A Comparison Between Two Devices For Obtaining Cytological Samples
Context and Objective: Fine-needle aspiration biopsy has been accepted worldwide for breast lesions. However, some questions remain, including the appropriateness of the puncture method. The objective of this work was to compare aspirates obtained by the auto-vacuum device and by the syringe pistol holder. Design and Setting: Randomized trial for validation of diagnostic method, at Hospital das Clinicas do Universidade Federal de Goiás and Hospital Araújo Jorge, Goiânio. Methods: 351 patients presenting breast lumps underwent fine-needle aspiration biopsy, either with the auto-vacuum device or the syringe pistol holder. A single cytopathologist analyzed all of the cytology slides. The rates of insufficient material, cellularity, cell distortion and background hemorrhage were evaluated. Results: The percentages of insufficient material were 16% and 22% (p = 0.18), for the auto-vacuum and pistol aspirates, respectively. Good cellularity was seen in 34% of autovacuum and 29% of pistol samples (p = 0.4). Cell distortion was seen in 31 and 26 cases, respectively (p = 07). Background hemorrhage occurred in 63 (35%) and 54 cases (31%) (p = 0.2), for auto-vacuum and pistol. The sensitivity was 88% and 86%; specificity 99% and 100%, positive predictive value 96% and and 100%, negative predictive value 96% and 95% and total occuracy 76% and 75% for the auto-vacuum and pistol, respectively. Conclusion: The results obtained from the two fine-needle aspiration biopsy methods were equivalent. Therefore, the auto-vacuum device is a good option for obtaining aspirates for cytology.1236271276Catania, S., Ciatto, S., Breast cytology: Instruments and technique (1992) Breast Cytology in Clinical Practice, pp. 11-60. , In: Ciatto S, editor. London: Martin DunitzDe Freitas Jr., R., Hamed, H., Fentiman, I., Fine needle aspiration cytology of palpable breast lesions (1992) Br J Clin Pract, 46 (3), pp. 187-190Franzen, S., Zajicek, J., Aspiration biopsy in diagnosis of palpable lesions of the breast. Critical review of 3479 consecutive biopsies Acta (1968) Radiol Ther Phys Biol, 7 (4), pp. 241-262Souza, J.A., Freitas Jr., R., Moreita, M.A.R., Philocreon, G.R., Acurácia da sensação tátil da PAAF no diagnóstico de less̄ocs mamárias (1995) Rev Bras Mastologia, 5 (3), pp. 7-10Freitas Júnior, R., Hamed, H., Millis, R.R., Tomas, N.M.A., Fentiman, I.S., Fine needle aspiration of breast lesions using auto-vacuum dispositive (1996) Rev Bras Mastologia, 6 (3), pp. 126-128de Freitas Júnior, R., Giraldo, P.C., Rerrori, O., Vieira-Matos, A.N., Tambascia, J.K., Fine needle aspiration biopsy of solid tumours by auto-vacuum system: A study in rats (1992) Eur J Surg Oncol, 18 (6), pp. 605-607Boccato, P., How to treat the aspirated material (1992) Breast Cytology in Clinical Practice, pp. 61-64. , In: Ciatto, S, editor London: Martin Dunitz(1987) International Union Against Cancer, , UICC. TNM classification of malignant tumors. Berlin: Springer-Verlag(1982) Am J Clin Pathol, 78 (6), pp. 806-816. , The World Health Organization Histological Typing of Breast Tumors - Second Edition. The World OrganizationGelabert, H.A., Hsiu, J.G., Mullen, J.T., Jaffe, A.H., D'Amato, N.A., Prospective evaluation of the rate of fine-needle aspiration biopsy in the diagnosis and management of patiencs with palpable solid breast lesions (1990) Am Surg, 56 (4), pp. 263-267Rouquayrol, M.Z., Epidemiologia e saúde (1988), Rio de Janeiro: Medsi - Editora CientíficaRoberts, J.C., Rainsbury, R.M., 'Tactile sensation: A new clinical sign during fine needle aspiration of breast lumps Ann (1994) R Coll Surg Eng, 76 (2), pp. 136-138Henderson, M.A., McCready, D.R., A simple technique for fine needle aspiration cytology (1994) J Am Coll Surg, 179 (4), pp. 471-473Sasaki, J., Izu, K., Automatic fine needle aspiration pistol specially designed for small tumors (1998) Acta Cytol, 42 (3), pp. 829-830Tao, L.C., Smith, J.W., Fine-needle aspiration biopsy using a newly-developed pencil-grip syringe holder (1999) Diagn Cytopathol, 20 (2), pp. 99-104Parel, J.J., Garrell, P.C., Smallwood, J.A., Fine needle aspiration cytology of breast masses: An evaluation of its accuracy and reasons for diagnostic failure (1987) Ann R Coll Surg Engl, 69 (4), pp. 156-159Abele, J., Stanley, M.W., Rollnis, S.D., Miller, T.R., What constitutes an adequate smear in fine-needle aspiration cytology of the breast? (1998) Cancer, 84 (1), pp. 57-61Zajdela, A., Ghossein, N.A., Pilleron, J.P., Ennuyer, A., The value of aspiration cytology in the diagnosis of breast cancer: Experience at the Fondation Curie (1975) Cancer, 35 (2), pp. 499-506Layfield, L.J., Dodd, L.G., Cytologically low grade malignancies: An important interpretative pitfall responsible for false negative diagnoses in fine-needle aspiration of the breast (1996) Diagn Cytopathol, 15 (3), pp. 250-259Feichter, G.E., Haberthür, F., Gobat, S., Dalquen, P., Breast cytology. Statistical analysis and cytohistologic correlations (1997) Acta Cytol, 41 (2), pp. 327-332Arisio, R., Cuccorese, C., Accinelli, G., Mano, M.P., Bordon, R., Fessia, L., Role of fine-needle aspiration biopsy in breast lesions: Analysis of a series of 4,110 cases (1998) Diagn Cytopathol, 18 (6), pp. 462-467Ariga, R., Bloom, K., Reddy, V.B., Fine-needle aspiration of clinically suspicious palpable breast masses with histopathologic correlation (2002) Am J Surg, 184 (5), pp. 410-41
Classes of exact wavefunctions for general time-dependent Dirac Hamiltonians in 1+1 dimensions
In this work we construct two classes of exact solutions for the most general
time-dependent Dirac Hamiltonian in 1+1 dimensions. Some problems regarding to
some formal solutions in the literature are discussed. Finally the existence of
a generalized Lewis-Riesenfeld invariant connected with such solutions is
discussed
Optical And Esr Study Of Er3+ In Linbo3
We report laser-excited optical transitions between the 4S3/2 and 4I15/2 multiplets of Er3+ as an impurity in the LiNbO3 host, together with the optical-absorption spectra at liquid-helium and liquid-nitrogen temperatures. The optical data allow us to determine the crystal-field splittings of those levels and the spin-Hamiltonian parameters for the 4I15/2 lower multiplet. The observed electron-spin resonance and the angular variation of this spectrum agree with the parameters obtained by optical techniques. Both techniques show that only one of the three possible trigonal sites in LiNbO3 is occupied by Er3+ within the experimental sensitivity, in agreement with recent x-ray standing-wave measurements. © 1995 The American Physical Society.5153206320
Chitosan/mangiferin particles for Cr(VI) reduction and removal
AbstractIn this work, chitosan/mangiferin particles (CMP) were prepared by spray-drying technique and characterized by SEM, DLS, FTIR, HPLC–UV and adsorption studies to investigate a possible application as a preventive material in cases of human and animal contamination with Cr(VI). CMP presented sizes ranging from nano to micrometers. Chitosan and mangiferin (MA) presence in the powder was confirmed by FTIR and MA quantification (136μg/mg) was performed using a calibration curve prepared by HPLC–UV. Adsorption capacity of Cr(VI) onto CMP was compared with chitosan and investigated in a batch system by considering the effects of various parameters like contact time, initial concentration of adsorbent and pH. Cr(VI) removal is pH dependent and it was found to be maximum at pH 5.0. The results showed that CMP has a potential application as a preventive material in cases of human or animal contamination with Cr(VI)
Free 2-propen-1-amine Derivative And Inclusion Complexes With β-cyclodextrin: Scanning Electron Microscopy, Dissolution, Cytotoxicity And Antimycobacterial Activity
Inclusion complexes and physical mixtures of isomeric mixture of E/Z (50:50) of 3-(4′-bromo-[1,1′-biphenyl]-4-yl)-3-(4-bromophenyl)-N,N- dimethyl-2-propen-1-amine (BBAP) and β-cyclodextrin (β-CD) in the molar proportion of 1:1 and 1:2 were analyzed by scanning electron microscopy. The dissolution behavior of BBAP and of the inclusion complexes were also evaluated for six hours. By scanning electron microscopy (SEM), it was possible to observe an inclusion complex formed between BBAP and β-CD by co-evaporation, either in the molar proportion of 1:1 or 1:2. In the physical mixtures, no complex was observed as previously detected by physicochemical analysis. The dissolution studies showed that the inclusion complexes BBAP/β-CD 1:1 and 1:2 released respectively 49.07 ± 1.48 and 40.26 ± 3.90% of BBAP during six hours. Free BBAP was less soluble than the inclusion complex and reached 9.00 ± 0.75% of dissolution. Biological assays, such as cytotoxicity to J774 macrophages and to a permanent lung fibroblast cell line (V79), indicated that the BBAP does not exhibit any additional toxic effect with the β-CD complexes. However, the complexes were less cytotoxic to V79 cells than the free form. The BBAP/β-CD inclusion complexes were more effective (MIC) than the free compound on several mycobacteria strains. Similar behavior was observed for BBAP/β-CD complexes and rifampicin, a front-line antitubercular drug, on M. tuberculosis H37Rv growing inside J774 macrophages.155682689Bibby, D.C., Davies, N.M., Tucker, I.G., (2000) Int. J. Pharm., 197, p. 1De Souza, A.O., Sato, D.N., Aily, D.C.G., Durán, N., (1998) J. Antimicrob. Chemother., 42, p. 407Pereira, D.G., De Castro, S.L., Durán, N., (1998) Acta Tropica, 69, p. 205De Souza, A.O., Santos Júnior, R.R., Ferreira-Júlio, J.F., Rodrigues, J.A., Melo, P.S., Haun, M., Sato, D.N., Durán, N., (2001) Eur. J. Med. Chem., 36, p. 843De Souza, A.O., Hemerly, F.P., Busollo, A.C., Melo, P.S., Machado, G.M.C., Miranda, C.C., Santa-Rita, R.M., Durán, N., (2002) J. Antimicrob. Chemother., 50, p. 629De Conti, R., Gimenez, S.M.N., Haun, M., Pilli, R.A., De Castro, S.L., Durán, N., (1996) Eur. J. Med. Chem., 31, p. 915De Souza, A.O., Santos Jr., R.R., Sato, D.N., Lima, H.O.S., Andrade-Santana, M.H., Alderete, J.B., Faljoni-Alario, A., Durán, N., (2000) Abstracts of the 29 a Reunião Anual Da Sociedade Brasileira de Bioquímica, , Caxambu, BrazilHiguchi, T., Connors, K.A., (1965) Adv. Anal. Chem. Instrum., 4, p. 117Collins, L.A., Franzblau, S.G., (1997) Antimicrob. Agents Chemother., 41, p. 1004Oh, Y.K., Nix, D.E., Straubinger, R.M., (1995) Antimicrob Agents Chemother., 39, p. 2104Cingi, M.R., De Angelis, I., Fortunati, E., Reggiani, D., Bianchi, V., Tiozzo, R., Zucco, F., (1991) Toxicol. In Vitro, 5, p. 119Denizot, F., Lang, R., (1986) J. Immun. Methods, 89, p. 271Borenfreund, E., Puerner, J.A., (1984) J. Tiss. Cult. Meth., 9, p. 7Melo, P.S., Maria, S.S., Vidal, B.C., Haun, M., Durán, N., (2000) In Vitro Cell Rev. Biol. Animal, 36, p. 539Melo, P.S., Durán, N., Haun, M., (2001) Toxicology, 159, p. 135Shrivastava, R., John, G.W., Rispat, G., Chevalier, A., Massingham, R., (1991) ATLA - Alt. Lab. Anim., 19, p. 39
Scalar field in cosmology: Potential for isotropization and inflation
The important role of scalar field in cosmology was noticed by a number of
authors. Due to the fact that the scalar field possesses zero spin, it was
basically considered in isotropic cosmological models. If considered in an
anisotropic model, the linear scalar field does not lead to isotropization of
expansion process. One needs to introduce scalar field with nonlinear potential
for the isotropization process to take place. In this paper the general form of
scalar field potentials leading to the asymptotic isotropization in case of
Bianchi type-I cosmological model, and inflationary regime in case of isotropic
space-time is obtained. In doing so we solved both direct and inverse problem,
where by direct problem we mean to find metric functions and scalar field for
the given potential, whereas, the inverse problem means to find the potential
and scalar field for the given metric function. The scalar field potentials
leading to the inflation and isotropization were found both for harmonic and
proper synchronic time.Comment: 10 page
Electron Collisions With Ammonia And Formamide In The Low- And Intermediate-energy Ranges
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We report an investigation on electron collisions with two nitrogen-containing compounds, namely ammonia (NH3) and formamide (NH2CHO). For ammonia, both theoretical and experimental differential, integral, and momentum-transfer cross sections, as well as calculated grand-total and total absorption cross sections, are reported in the 50-500 eV incident energy range. Calculated results of various cross sections are also reported for energies below 50 eV. Experimentally, angular distributions of the scattered electrons were measured using a crossed electron beam-molecular beam geometry and then converted to absolute differential cross sections using the relative flow technique. Absolute integral and momentum-transfer cross sections for elastic e - ammonia scattering were also derived from the measured differential cross sections. For formamide, only theoretical cross sections are presented in the 1-500 eV incident energy range. A single-center-expansion technique combined with the method of Padé was used in our calculations. For both targets, our calculated cross sections are compared with the present measured data and with the theoretical and experimental data available in the literature and show generally good agreement. Moreover, for formamide, two shape resonances located at 3.5 eV and 15 eV which correspond to the continuum 2A'' and 2A' scattering symmetries, respectively, are identified. The former can be associated to the 2B1 shape resonance in formaldehyde located at around 2.5 eV, whereas the latter can be related to the 2E resonance in ammonia at about 10 eV. Such correspondence is very interesting and so supports the investigation on electron interaction with small building blocks, instead of with larger biomolecules.906CAPES; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior; FAPESP; Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Boudaïffa, B., Cloutier, P., Hunting, D., Huels, M.A., Sanche, L., (2000) Science, 287, p. 1658. , SCIEAS 0036-8075Huels, M.A., Boudaïffa, B., Cloutier, P., Hunting, D., Sanche, L., (2003) J. Am. Chem. Soc., 125, p. 4467. , JACSAT 0002-7863Sugohara, R.T., Homem, M.G.P., Sanches, I.P., De Moura, A.F., Lee, M.T., Iga, I., (2011) Phys. Rev. A, 83, p. 032708. , PLRAAN 1050-2947Lee, M.-T., De Souza, G.L.C., Machado, L.E., Brescansin, L.M., Dos Santos, A.S., Lucchese, R.R., Sugohara, R.T., Iga, I., (2012) J. Chem. Phys., 136, p. 114311. , JCPSA6 0021-9606De Souza, G.L.C., Lee, M.-T., Sanches, I.P., Rawat, P., Iga, I., Dos Santos, A.S., Machado, L.E., Lucchese, R.R., (2010) Phys. Rev. A, 82, p. 012709. , PLRAAN 1050-2947Sugohara, R.T., Homem, M.G.P., Iga, I., De Souza, G.L.C., Machado, L.E., Ferraz, J.R., Dos Santos, A.S., Lee, M.-T., (2013) Phys. Rev. A, 88, p. 022709. , PLRAAN 1050-2947Sato, T., Shibata, F., Goto, T., (1986) Chem. Phys., 108, p. 147. , CMPHC2 0301-0104Brüche, E., (1927) Ann. Phys. (Leipzig), 83, p. 1065. , ANPYA2 0003-3804Sueoka, O., Mori, S., (1984) J. Phys. Soc. Jpn., 53, p. 2491. , JUPSAU 0031-9015Szmytkowski, C., Maciag, K., Karwarsz, G., Filipović, D., (1989) J. Phys. B, 22, p. 525. , JPAPEH 0953-4075Zecca, A., Karwasz, G.P., Brusa, R.S., (1992) Phys. Rev. A, 45, p. 2777. , PLRAAN 1050-2947García, G., Manero, F., (1996) J. Phys. B, 29, p. 4017. , JPAPEH 0953-4075Ariyasinghe, W.M., Wijeratne, T., Palihawadana, P., (2004) Nucl. Instrum. Meth. B, 217, p. 389Jones, N.C., Field, D., Lunt, S.L., Ziesel, J.P., (2008) Phys. Rev. A, 78, p. 042714. , PLRAAN 1050-2947Rao, M.V.V.S., Srivastava, S.K., (1992) J. Phys. B, 25, p. 2175. , JPAPEH 0953-4075Hayashi, H., (1981), Institute of Plasma Physics, Nagoya University, Japan, Report No. IPPJ-AM-19, (unpublished)Pack, J.I., Voshall, R.E., Phelps, A.V., (1962) Phys. Rev., 127, p. 2084. , PHRVAO 0031-899XAltshuler, S., (1957) Phys. Rev., 107, p. 114. , PHRVAO 0031-899XBen Arfa, M., Tronc, M., (1988) J. Chim. Phys., 85, p. 889Furlan, M., Hubin-Franskin, M.-J., Delwiche, J., Collin, J.E., (1990) J. Chem. Phys., 92, p. 213. , JCPSA6 0021-9606Alle, D.T., Gulley, R.J., Buckman, S.J., Brunger, M.J., (1992) J. Phys. B, 25, p. 1533. , JPAPEH 0953-4075Harshbarger, W.R., Skerbele, A., Lassettre, E.N., (1971) J. Chem. Phys., 54, p. 3784. , JCPSA6 0021-9606Gulley, R.J., Brunger, M.J., Buckman, S.J., (1992) J. Phys. B: At. Mol. Opt. Phys., 25, p. 2433. , JPAPEH 0953-4075Gianturco, F.A., Jain, A., (1986) Phys. Rep., 143, p. 347. , PRPLCM 0370-1573Pritchard, H.P., Lima, M.A.P., McKoy, V., (1989) Phys. Rev. A, 39, p. 2392. , 0556-2791Gianturco, F., (1991) J. Phys. B: At. Mol. Opt. Phys., 24, p. 4627. , JPAPEH 0953-4075Rescigno, T.N., Lengsfield, B.H., McCurdy, C.W., Parker, S.D., (1992) Phys. Rev. A, 45, p. 7800. , PLRAAN 1050-2947Ribeiro, E.M.S., Machado, L.E., Lee, M.-T., Brescansin, L.M., (2001) Comput. Phys. Commun., 136, p. 117. , CPHCBZ 0010-4655Munjal, H., Baluja, K., (2007) J. Phys. B, 40, p. 1713. , JPAPEH 0953-4075Jain, A.K., Tripathi, A.N., Jain, A., (1989) Phys. Rev. A, 39, p. 1537. , 0556-2791Joshipura, K.N., Vinodkumar, M., Patel, U.M., (2001) J. Phys. B, 34, p. 509. , JPAPEH 0953-4075Yuan, J., Zhang, Z., (1992) Phys. Rev. A, 45, p. 4565. , PLRAAN 1050-2947Limbachiya, C., Vinodkumar, M., Mason, N., (2011) Phys. Rev. A, 83, p. 042708. , PLRAAN 1050-2947Maljković, J.B., Blanco, F., García, G., Milosavljević, A.R., (2012) Nucl. Instrum. Methods, Phys. Res. B, 279, p. 124. , NIMBEU 0168-583XHollis, J.M., Lovas, F.J., Remijian, A., Jewell, P.R., Ilushin, V., Kleiner, I., (2006) Astrophys. J. Lett., 643, p. L25. , AJLEEY 0004-637XBettega, M.H.F., (2010) Phys. Rev. A, 81, p. 062717. , PLRAAN 1050-2947Wang, Y.-F., Tian, S.X., (2012) Phys. Rev. A, 85, p. 012706. , PLRAAN 1050-2947Gupta, D., Naghma, R., Antony, B., (2014) Mol. Phys., 112, p. 1201. , MOPHAM 0026-8976Srivastava, S.K., Chutjian, A., Trajmar, S., (1975) J. Chem. Phys., 63, p. 2659. , JCPSA6 0021-9606Iga, I., Lee, M.T., Homem, M.G.P., Machado, L.E., Brescansin, L.M., (2000) Phys. Rev. A, 61, p. 022708. , PLRAAN 1050-2947Rawat, P., Iga, I., Lee, M.T., Brescansin, L.M., Homem, M.G.P., Machado, L.E., (2003) Phys. Rev. A, 68, p. 052711. , PLRAAN 1050-2947Iga, I., Sanches, I.P., Srivastava, S.K., Mangan, M., (2001) Int. J. Mass Spectrom., 208, p. 159. , IMSPF8 1387-3806Homem, M.G.P., Iga, I., Sugohara, R.T., Sanches, I.P., Lee, M.T., (2011) Rev. Sci. Instrum., 82, p. 013109Jansen, R.H.J., De Heer, F.J., Luyken, H.J., Van Wingerden, B., Blaauw, H.J., (1976) J. Phys. B, 9, p. 185. , JPAMA4 0022-3700Dubois, R.D., Rudd, M.E., (1976) J. Phys. B, 9, p. 2657. , JPAMA4 0022-3700Rawat, P., Homem, M.G.P., Sugohara, R.T., Sanches, I.P., Iga, I., De Souza, G.L.C., Dos Santos, A.S., Lee, M.-T., (2010) J. Phys. B, 43, p. 225202. , JPAPEH 0953-4075Ferraz, J.R., Dos Santos, A.S., De Souza, G.L.C., Zanelato, A.I., Alves, T.R.M., Lee, M.-T., Brescansin, L.M., Machado, L.E., (2013) Phys. Rev. A, 87, p. 032717. , PLRAAN 1050-2947Gianturco, F.A., Lucchese, R.R., Sanna, N., (1995) J. Chem. Phys., 102, p. 5743. , JCPSA6 0021-9606Edmonds, A.R., (1960) Angular Momentum and Quantum Mechanics, , (Princeton University Press, Princeton, NJ)Padial, N.T., Norcross, D.W., (1984) Phys. Rev. A, 29, p. 1742. , 0556-2791Lee, M.-T., Iga, I., Machado, L.E., Brescansin, L.M., Castro E A, Y., Sanches, I.P., De Souza, G.L.C., (2007) J. Electron Spectrosc. Relat. Phenom., 155, p. 14. , JESRAW 0368-2048Staszewska, G., Schwenke, D.W., Truhlar, D.G., (1984) Phys. Rev. A, 29, p. 3078. , 0556-2791Hara, S., (1967) J. Phys. Soc. Jpn., 22, p. 710. , JUPSAU 0031-9015Frisch, M.J., (2004) Gaussian 03, Revision C. 02, , (Gaussian Inc., Wallingford, CT)http://cccbdb.nist.govBurke, P.G., Chandra, N., Gianturco, F.A., (1972) J. Phys. B, 5, p. 2212. , JPAMA4 0022-3700Machado, L.E., Brescansin, L.M., Iga, I., Lee, M.-T., (2005) Eur. Phys. J. D, 33, p. 193. , EPJDF6 1434-6060Brescansin, L.M., Machado, L.E., Lee, M.-T., Cho, H., Park, Y.S., (2008) J. Phys. B, 41, p. 185201. , JPAPEH 0953-4075Itikawa, Y., (1974) At. Data Nucl. Data Tables, 14, p. 1Kim, Y.-K., Rudd, M.E., (1994) Phys. Rev. A, 50, p. 3954. , PLRAAN 1050-2947Schmidt, M.W., Baldridge, K.K., Boatz, J.A., Elbert, S.T., Gordon, M.S., Jensen, J.H., Koseki, S., Montgomery, J.A., (1993) J. Comput. Chem., 14, p. 1347. , JCCHDD 0192-8651Khakoo, M.A., Blumer, J., Keane, K., Campbell, C., Silva, H., Lopes, M.C.A., Winstead, C., Bettega, M.H.F., (2008) Phys. Rev. A, 77, p. 042705. , PLRAAN 1050-2947Goumans, T.P.M., Gianturco, F.A., Sebastianelli, F., Baccarelli, I., Rivail, J.L., (2009) J. Chem. Theory Comput., 5, p. 217. , 1549-9618Gallup, G.A., (2013) J. Chem. Phys., 139, p. 104308. , 0021-960
Quasiparticle Interactions in Fractional Quantum Hall Systems: Justification of Different Hierarchy Schemes
The pseudopotentials describing the interactions of quasiparticles in
fractional quantum Hall (FQH) states are studied. Rules for the identification
of incompressible quantum fluid ground states are found, based upon the form of
the pseudopotentials. States belonging to the Jain sequence nu=n/(1+2pn), where
n and p are integers, appear to be the only incompressible states in the
thermodynamic limit, although other FQH hierarchy states occur for finite size
systems. This explains the success of the composite Fermion picture.Comment: RevTeX, 10 pages, 7 EPS figures, submitted fo Phys.Rev.
Histologia da pele da carpa prateada (Hypophtalmichthys molitrix) e testes de resistência do couro
Viability of Noether symmetry of F(R) theory of gravity
Canonization of F(R) theory of gravity to explore Noether symmetry is
performed treating R - 6(\frac{\ddot a}{a} + \frac{\dot a^2}{a^2} +
\frac{k}{a^2}) = 0 as a constraint of the theory in Robertson-Walker
space-time, which implies that R is taken as an auxiliary variable. Although it
yields correct field equations, Noether symmetry does not allow linear term in
the action, and as such does not produce a viable cosmological model. Here, we
show that this technique of exploring Noether symmetry does not allow even a
non-linear form of F(R), if the configuration space is enlarged by including a
scalar field in addition, or taking anisotropic models into account.
Surprisingly enough, it does not reproduce the symmetry that already exists in
the literature (A. K. Sanyal, B. Modak, C. Rubano and E. Piedipalumbo,
Gen.Relativ.Grav.37, 407 (2005), arXiv:astro-ph/0310610) for scalar tensor
theory of gravity in the presence of R^2 term. Thus, R can not be treated as an
auxiliary variable and hence Noether symmetry of arbitrary form of F(R) theory
of gravity remains obscure. However, there exists in general, a conserved
current for F(R) theory of gravity in the presence of a non-minimally coupled
scalar-tensor theory (A. K. Sanyal, Phys.Lett.B624, 81 (2005),
arXiv:hep-th/0504021 and Mod.Phys.Lett.A25, 2667 (2010), arXiv:0910.2385
[astro-ph.CO]). Here, we briefly expatiate the non-Noether conserved current
and cite an example to reveal its importance in finding cosmological solution
for such an action, taking F(R) \propto R^{3/2}.Comment: 16 pages, 1 figure. appears in Int J Theoretical Phys (2012
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