Ion-beam mixing and solid-state reaction in Zr-Fe multilayers

Vapor-deposited Zr-Fe multilayered thin films with various wavelengths and of overall composition either 50% Fe or Fe-rich up to 57% Fe were either irradiated with 300 keV Kr ions at temperatures from 25 K to 623 K to fluences up to 2 {times} 10{sup 16} cm{sup {minus}2}, or simply annealed at 773 K in-situ in the Intermediate Voltage Electron microscope At Argonne National Laboratory. Under irradiation, the final reaction product is the amorphous phase in all cases studied, but the dose to amorphization depends on the temperature and on the wavelength. In the purely thermal case (annealing at 773 K), the 50-50 composition produces the amorphous phase but for the Fe-rich multilayers the reaction products depend on the multilayer wavelength. For small wavelength, the amorphous phase is still formed, but at large wavelength the Zr-Fe crystalline intermetallic compounds appear. These results are discussed in terms of existing models of irradiation kinetics and phase selection during solid state reaction

Testicular masses in association with Adrenogenital syndrome: US findings

Adrenogenital syndrome (AGS) is the result of inborn enzymatic defects in the synthesis of steroid hormones. The production of cortisol is deficient and that of adrenocorticotropic hormone is increased. Sometimes male patients have clinically detectable testicular lesions, known as testicular tumors of AGS (TTAGS). From 1985 to 1991, scrotal ultrasonography (US) was performed in 30 consecutive pubertal and postpubertal patients with AGS to investigate the prevalence and US characteristics of TTAGS. Eight of 30 patients had a testicular lesion (27%); six of the eight lesions were clinically undetected. The mean diameter of the lesions was 16.44 mm (range, 2-28 mm). The lesions were hypoechoic in all cases, with well-defined margins in six cases. The nodules were multifocal in all patients and bilateral in six (75%). If testicular lesions are present in a patient with AGS, TTAGS are likely, and frequent US monitoring is adequate for diagnostic evaluation

Adsorption of glyphosate in a forest soil: a study using Mössbauer and FT-IR spectroscopy

We studied the adsorption of glyphosate (GPS) onto soil mineral particles, using FT-IR and Mössbauer spectroscopy. From IR measurements for samples collected under native vegetation of a forest reserve, bands at 1632 and 1407 cm-1 could be attributed to the interaction between the carboxylic group of GPS and structural Al3+ and Fe3+ on the surface of mineral particles; bands at 1075 and 1000 cm-1 were observed only for cultivated soil. Mössbauer spectra for these soils were definitely fitted using a broad central doublet in addition to the magnetic component. This multiple quadrupolar component may be attributed to all non-magnetic Fe3+ contributions, including that of the GPS/Fe3+ complex

Nanometric Particle Size And Phase Controlled Synthesis And Characterization Of γ-fe2o3 Or (α + γ)-fe2o3 By A Modified Sol-gel Method

Fe2O3 nanoparticles with sizes ranging from 15 to 53 nm were synthesized by a modified sol-gel method. Maghemite particles as well as particles with admixture of maghemite and hematite were obtained and characterized by XRD, FTIR, UV-Vis photoacoustic and Mössbauer spectroscopy, TEM, and magnetic measurements. The size and hematite/maghemite ratio of the nanoparticles were controlled by changing the Fe:PVA (poly (vinyl alcohol)) monomeric unit ratio used in the medium reaction (1:6, 1:12, 1:18, and 1:24). The average size of the nanoparticles decreases, and the maghemite content increases with increasing PVA amount until 1:18 ratio. The maghemite and hematite nanoparticles showed cubic and hexagonal morphology, respectively. Direct band gap energy were 1.77 and 1.91 eV for A6 and A18 samples. Zero-field-cooling-field-cooling curves show that samples present superparamagnetic behavior. Maghemite-hematite phase transition and hematite Néel transition were observed near 700 K and 1015 K, respectively. Magnetization of the particles increases consistently with the increase in the amount of PVA used in the synthesis. Mössbauer spectra were adjusted with a hematite sextet and maghemite distribution for A6, A12, and A24 and with maghemite distribution for A18, in agreement with XRD results. © 2013 AIP Publishing LLC.11410Xu, P., Zeng, G.M., Huang, D.L., Feng, C.L., Hu, S., Zhao, M.H., Lai, C., Liu, Z.F., (2012) Sci. Total Environ., 424, pp. 1-10. , 10.1016/j.scitotenv.2012.02.023Rajabi, F., Karimi, N., Saidi, M.R., Primo, A., Varma, R.S., Luque, R., (2012) Adv. Synth. Catal., 354, pp. 1707-1711. , 10.1002/adsc.201100630Kitamuraa, H., Zhaob, L., Hangc, B.T., Okadab, S., Yamaki, J.-I., (2012) J. Power Sources, 208, pp. 391-396. , 10.1016/j.jpowsour.2012.02.051Figuerola, A., Di Corato, R., Manna, L., Pellegrino, T., (2010) Pharmacol. Res., 62, pp. 126-143. , 10.1016/j.phrs.2009.12.012Yang, H.-M., Oh, B.C., Kim, J.H., Ahn, T., Nam, H.-S., Park, C.W., Kim, J.-D., (2011) Colloids Surf., A, 391, pp. 208-215. , 10.1016/j.colsurfa.2011.04.032Xu, H., Aguilar, Z.P., Yang, L., Kuang, M., Duan, H., Xiong, Y., Wei, H., Wang, A., (2011) Biomaterials, 32, pp. 9758-9765. , 10.1016/j.biomaterials.2011.08.076Mahmoudi, M., Sant, S., Wang, B., Laurent, S., Sen, T., (2011) Adv. Drug Delivery Rev., 63, pp. 24-46. , 10.1016/j.addr.2010.05.006Jolivet, J.-P., Cassaignon, S., Chanéac, C., Chiche, D., Durupthy, O., Portehault, D., (2010) C. R. Chim., 13, pp. 40-51. , 10.1016/j.crci.2009.09.012Yang, S., Jang, Y.-H., Kim, C.H., Hwang, C., Lee, J., Chae, S., Jung, S., Choi, M., (2010) Powder Technol., 197, pp. 170-176. , 10.1016/j.powtec.2009.09.011Wu, Y., Wang, X., (2011) Mater. Lett., 65, pp. 2062-2065. , 10.1016/j.matlet.2011.04.004Fernandes, D.M., Hechenleitner, A.A.W., Silva, M.F., Lima, M.K., Bittencourt, P.R.S., Silva, R., Melo, M.A.C., Pineda, E.A.G., (2009) Mater. Chem. Phys., 118, pp. 447-452. , 10.1016/j.matchemphys.2009.08.016Han, L.-H., Liu, H., Wei, Y., (2011) Powder Technol., 207, pp. 42-46. , 10.1016/j.powtec.2010.10.008Chen, L., Lin, Z., Zhao, C., Zheng, Y., Zhou, Y., Peng, H., (2011) J. Alloy Compd., 509, pp. 1-L5. , 10.1016/j.jallcom.2010.08.130Hassanjani-Roshan, A., Vaezi, M.R., Shokuhfar, A., Rajabali, Z., (2011) Particuology, 9, pp. 95-99. , 10.1016/j.partic.2010.05.013Khaleel, A., Al-Marzouqi, A., (2012) Mater. Lett., 68, pp. 385-387. , 10.1016/j.matlet.2011.11.002Komarneni, S., Hu, W., Noh, Y.D., Orden, A.V., Feng, S., Wei, C., Pang, H., Katsuki, H., (2012) Ceram. Int., 38, pp. 2563-2568. , 10.1016/j.ceramint.2011.11.027Fernandes, D.M., Silva, R., Hechenleitner, A.A.W., Radovanovic, E., Melo, M.A.C., Pineda, E.A.G., (2009) Mater. Chem. Phys., 115, pp. 110-115. , 10.1016/j.matchemphys.2008.11.038Rodriguez-Carvajal, J., (1993) Physica B, 192, pp. 55-69. , 10.1016/0921-4526(93)90108-ICornell, R.M., Sshwertmann, U., (2003) The Iron Oxides: Structures, Properties, Reactions, Occurrences and Uses, , (John Wiley Sons)Gotic, M., Music, S., Mössbauer, FT-IR and FE SEM investigation of iron oxides precipitated from FeSO4 solutions (2007) Journal of Molecular Structure, 834-836 (SPEC. ISS.), pp. 445-453. , DOI 10.1016/j.molstruc.2006.10.059, PII S0022286006009513Predoi, D., (2007) Dig. J. Nanomater. Biostruct., 2, pp. 169-173Namduri, H., Nasrazadani, S., (2008) Corros. Sci., 50, pp. 2493-2497. , 10.1016/j.corsci.2008.06.034Gulgun, M.A., Nguyen, M.H., Kriven, W.M., (1999) J. Am. Ceram. Soc., 82, pp. 556-560. , 10.1111/j.1151-2916.1999.tb01800.xFeng, J., Liu, T., Xu, Y., Zhao, J., He, Y., (2011) Ceram. Int., 37, pp. 1203-1207. , 10.1016/j.ceramint.2010.11.045Park, T.-J., Papaefthymiou, G.C., Moodenbaugh, A.R., Mao, Y., Wong, S.S., Synthesis and characterization of submicron single-crystalline Bi 2Fe4O9 cubes (2005) Journal of Materials Chemistry, 15 (21), pp. 2099-2105. , DOI 10.1039/b501552aLiu, T., Xu, Y., Zhao, J., (2010) J. Am. Ceram. Soc., 93, pp. 3637-3641. , 10.1111/j.1551-2916.2010.03945.xSarangi, P.P., Naik, B., Ghosh, N.N., (2009) Powder Technol., 192, pp. 245-249. , 10.1016/j.powtec.2009.01.002Sarangi, P.P., Naik, B.D., Vadera, S.R., Patra, M.K., Prakash, C., Ghosh, N.N., (2009) Mater. Technol.: Adv. Perform. Mater., 24, pp. 97-99. , 10.1179/175355509X387156Tauc, J., Grigorovici, R., Vancu, A., (1966) Phys. Status Solidi, 15, p. 627. , 10.1002/pssb.19660150224Martinez, F.L., Toledano-Luque, M., Gandia, J.J., Carabe, J., Bohne, W., Rohrich, J., Strub, E., Martil, I., Optical properties and structure of HfO2 thin films grown by high pressure reactive sputtering (2007) Journal of Physics D: Applied Physics, 40 (17), pp. 5256-5265. , DOI 10.1088/0022-3727/40/17/037, PII S0022372707493032, 037Rahman, M.M., Khan, S.B., Faisal, M., Asiri, A.M., Tariq, M.A., (2012) Electrochim. Acta, 75, pp. 164-170. , 10.1016/j.electacta.2012.04.093Gilbert, B., Frandsen, C., Maxey, E.R., Sherman, D.M., (2009) Phys. Rev. B, 79, p. 035108. , 10.1103/PhysRevB.79.035108Echigo, T., Aruguete, D.M., Murayamac, M., Hochella Jr., M.F., (2012) Geochim. Cosmochim. Acta, 90, pp. 149-162. , 10.1016/j.gca.2012.05.008Duret, A., Gratzel, M., Visible light-induced water oxidation on mesoscopic α-Fe 2O3 films made by ultrasonic spray pyrolysis (2005) Journal of Physical Chemistry B, 109 (36), pp. 17184-17191. , DOI 10.1021/jp044127cSouza, F.L., Lopes, K.P., Nascente, P.A.P., Leite, E.R., (2009) Sol. Energy Mater. Sol. Cells, 93, pp. 362-368. , 10.1016/j.solmat.2008.11.049De Oliveira, L.A.S., Sinnecker, J.P., Vieira, M.D., Penton-Madrigal, A., (2010) J. Appl. Phys., 107, pp. 09D907. , 10.1063/1.3362927Ennas, G., Marongiu, G., Musinu, A., Falqui, A., Ballirano, P., Caminiti, R., (1999) J. Mater. Res., 14, pp. 1570-1575. , 10.1557/JMR.1999.0210Wu, J., Mao, S., Ye, Z., Xie, Z., Zheng, L., (2010) ACS Appl. Mater. Interfaces, 2, pp. 1561-1564. , 10.1021/am1002052Phu, N.D., Ngo, D.T., Hoang, L.H., Luong, N.H., Chau, N., Hai, N.H., (2011) J. Phys. D: Appl. Phys., 44, p. 345002. , 10.1088/0022-3727/44/34/345002Nagar, H., Kulkarni, N.V., Karmakar, S., Sahoo, B., Banerjee, I., Chaudhari, P.S., Pasricha, R., Keune, W., (2008) Mater. Charact., 59, pp. 1215-1220. , 10.1016/j.matchar.2007.10.003Goulart, A.T., Filho D. F M, J., (1994) Hyperfine Interact., 83, pp. 451-455. , 10.1007/BF02074316Costa, G.M., Grave, E., Bowen, L.H., Vandenberghe, R.E., Bakker, P.M.A., (1994) Clay Clay Miner., 42, pp. 628-633. , 10.1346/CCMN.1994.042051

On the existence of fixed points that belong to the zero set of a certain function

Let T : X -> X be a given operator and F-T be the set of its fixed points. For a certain function phi : X -> [0,infinity), we say that F-T is phi-admissible if F-T is nonempty and F-T subset of Z(phi), where Z(phi) is the zero set of phi. In this paper, we study the phi-admissibility of a new class of operators. As applications, we establish a new homotopy result and we obtain a partial metric version of the Boyd-Wong fixed point theorem

The SIB Swiss Institute of Bioinformatics' resources: focus on curated databases

The SIB Swiss Institute of Bioinformatics (www.isb-sib.ch) provides world-class bioinformatics databases, software tools, services and training to the international life science community in academia and industry. These solutions allow life scientists to turn the exponentially growing amount of data into knowledge. Here, we provide an overview of SIB's resources and competence areas, with a strong focus on curated databases and SIB's most popular and widely used resources. In particular, SIB's Bioinformatics resource portal ExPASy features over 150 resources, including UniProtKB/Swiss-Prot, ENZYME, PROSITE, neXtProt, STRING, UniCarbKB, SugarBindDB, SwissRegulon, EPD, arrayMap, Bgee, SWISS-MODEL Repository, OMA, OrthoDB and other databases, which are briefly described in this article