The Borg 6–20 rating of perceived exertion (RPE) scale is a common measure reported during exercise testing and training, and is usually taken as a response measurement to provide a subjective assessment of exercise intensity. A lesser used application of the scale is for regulating exercise intensity, referred to as its ‘production mode’. Recent research on this topic initiated by Eston et al. (2005) has led to a novel application of this procedure as a means of predicting an individual’s maximal oxygen uptake ( O2max) via a perceptually-regulated exercise test (PRET). The PRET could play a significant role in guiding exercise prescription and monitoring cardiorespiratory fitness levels in situations where the normal heart rate response is affected. The aim of this thesis is to develop further and test the integrity of the PRET technique. Firstly, a review of the evidence on the validity and reliability of the Borg RPE scale when used to regulate exercise intensity in healthy and unhealthy adults is presented, as to-date, no scholarly publication has synthesised the body of knowledge on this specific application of the scale. Subsequently, four studies were completed to investigate the effects of different methodological variations on the predictive capabilities of the PRET, including an examination (for the first time) of its utility among heart failure patients (Study 4). Study 1 re-visited the validity and reliability of the PRET technique utilising a modified protocol of differing durations (2 and 4 min bouts), with revised instructions and placing the graded exercise test (GXT) as the final trial during cycle ergometry. Superior results were observed to those reported in previous investigations (Eston et al., 2008; Faulkner et al. 2007; Eston et al., 2006) during the 3 min trial, further reinforcing the validity and reliability of this technique. Accordingly, Study 2 was the first to investigate the reliability and validity of a treadmill PRET protocol with a ceiling intensity of RPE 15, rather than RPE 17, and observed that a safer modified PRET (with practice) provides acceptably valid and reliable predictions of O2max in healthy adults. In addition, Study 3 extended the research thus far by investigating the PRET protocol during cycle exercise, once again with a ceiling intensity of RPE 15, and demonstrated that (with practice) a cycle-based PRET can yield reliable and valid predictions of O2max that compare favourably to previous investigations. Finally, given that the research employing a PRET has unanimously alluded to its likely value in clinical populations among whom heart rate as a physiological response to exercise is affected (e.g. via medication) and precluded as a means predicting O2max, Study 4 investigated the utility of a PRET in a beta-blocked population of heart failure patients. In the event, it was observed that a PRET (up to RPE 15) was too strenuous and needs to be capped at an intensity of RPE 13 in this population. In addition a continuous protocol seemed unsuitable due to its length and it was recommended that a discontinuous PRET protocol be investigated. Future research needs to investigate the utilisation of the PRET (i) in different exercise modes; (ii) determine the optimum number of practice trials required; (iii) whether a discontinuous or continuous protocol is more appropariate; (iv) whether the extrapolation should be made to RPE 19 or 20 and; (v) whether the PRET can be employed succesfully in other clinical populations.

The purpose of this investigation is to examine the energy demand of heavy metal drummers during rehearsal in order to understand the physiological responses. This information may lead to a better understanding of energy expenditure and add to the compendium of physical activity. The investigation consisted of eight apparently healthy 20 to 37-year-old males were recruited for this investigation. Information gathered during the drum test was average VO2, VO2peak, HR in beats per minute (bpm), metabolic equivalents (METs), and energy expenditure (EE) expressed in calories (kcals) per minute and per hour. Rating of perceived exertion (RPE) was used in addition to VO2 and HR values to assess physical demand. The Bruce Protocol maximal treadmill test was administered to compare the participants VO2max to their VO2peak while drumming. The EE during the 40-minute drum test was 387.05 + 83 kcals with an estimated hourly EE of 567.33 + 111.7 kcals. VO2, VO2peak, VE, and HR was 21.4 + 4.1 ml/kg/min, 33.9 + 8.1 ml/kg/min, 63.5 + 19 L/min, and 150.4 + 13.6 bpm respectively. The average MET level reached was six. RPE was 13.8 + 1.2 and is expressed as “somewhat hard” in difficulty according to the ACSM. Those categorized as having an average level of fitness reached 50-59% of their VO2max while the two individuals categorized as having an excellent level of fitness reached 42-45% of their VO2max. In conclusion, heavy metal drumming is a form of physical activity that is of moderate intensity and can be compared to other forms of recreational and work related physical activity.

Zebrafish (Danio rerio) show a unique pigmentation pattern comprised of three pigment cell types: melanophores, iridophores and xanthophores. Other pigmented cells include the retinal pigmented epithelium (rpe) which absorbs excess light in the eye and maintain the extracellular environment around the photoreceptors. While previous mutations in mitfa showed a role in regulating trunk melanophores, the rpe was not affected. TALENs and CRISPR-Cas9 systems were used to generate mutant zebrafish for tfec, a transcription factor expressed in both neural crest and rpe. Embryos with tfec mutations showed a loss of iridophore pigmentation, and delays in the pigmentation of xanthophores and rpe, showing positive regulation of multiple pigment cells. Double mutants for tfec and mitfa displayed greater losses of iridophore, xanthophore and rpe pigmentation with noncircular globes, suggesting cooperative roles for these transcription factors.

Neste trabalho foi desenvolvido um programa para simular espectros de ressonância paramagnética eletrônica (RPE) de onda contínua de amostras policristalinas para tensores não coincidentes. O Hamiltoniano de spin utilizado inclui os tensores anisotrópicos g, interação hiperfina, divisão de campo zero e quadrupolar e o termo Zeeman nuclear isotrópico. O programa inclui várias tecnologias novas, tais como: segmentação de campo com teoria de perturbação de autocampo para localizar as posições de campo ressonante, os métodos de distribuição Espiral e Repulsão para determinar o conjunto de orientações e a interpolação bidimensional triangular para reduzir o número de orientações computadas. A conjunção desses algoritmos podem aumentar a velocidade e a precisão das simulações, especialmente na simulação de espectros de sistemas de spin de dimensões grandes. O programa foi testado em algumas situações reais e o resultado obtido pode ser considerado, em alguns casos, equivalente aos programas comerciais e, em outros casos, de qualidade superior. / A computer program to simulate continuous wave electron paramagnetic resonance (EPR) powder spectra for noncoincident tensors has been developed. The spin Hamiltonian used includes anisotropic g, hyperfine interaction, zero field splitting and quadrupolar tensors and isotropic nuclear Zeeman term. The program includes a number of new technologies such as: field positions, spiral and repulsion methods for determining a set of orientations and triangular bidimensional interpolation to reduce the number of computed orientations. The conjunction of these algorithms can greatly increase the speed and the accuracy of simulations; especially in simulating powder spectra of spin systems of large dimensions. The program has been tested in some real situations and the obtained result can be considered, in some cases, equivalent to that of commercial software, in other cases, of superior quality.

Estão sendo apresentados, neste trabalho, estudos estruturais e magnéticos do composto de [CuBr2(fdmp)2] utilizando as técnicas de difração de Raio-X e espectroscopia de EPR. a complexo cristaliza no grupo espacial P21/n com a=8.1653(47)&#197, b=10.432(3)&#197, c=13.385(4)&#197, &#946=100.12(4)&#176 e Z=2. Os íons de Cu(II), que estão em coordenação quadrado-planar trans ligando-se a dois Nitrogênios e dois Bromos, se encontram em centros de inversão. Somente urna linha de EPR e observada, proveniente do colapso das ressonâncias relativas aos dois íons de Cu(II) magneticamente não equivalentes, causado pela interação de troca. Devido a diferença significativa entre os pesos atômicos do Nitrogênio e Bromo, não e esperada urna simetria axial para o tensor g como é comum ocorrer em vários complexos de Cu(II); de fato, a decomposição de g cristalino para os dois g moleculares revela três autovalores distintos. Alem disso, a direção de maior g não coincide exatamente com a normal ao quadrado-planar, como é comum nesses complexos: se encontra rodada de &#8764 5&#176 em direção ao Bromo, caracterizando um estado fundamental do tipo dx2-y2 com mistura de dyz. Outro fato incomum verificado foi a dependência do fator g com a freqüência e a presença de contribuições não-seculares, característicos de sistemas em que a freqüência de troca é próxima a freqüência de Larmor. Uma analise da variação angular da largura de linha de ressonância foi utilizada para a determinação do parâmetro de troca &#8204J&#8204. Está também incluído, neste trabalho, um método numérico de decomposição de g cristalino em g moleculares e sua comparação com métodos da literatura. / In the present work, we discuss the structural and magnetic properties of the [CuBr2(fdmp)2] compound deduced from studies of X-ray diffraction and EPR spectroscopy. This complex crystallizes in the spatial group P21/n with a=8.1653(47)&#197, b=10.432(3)&#197, c=13.385(4)&#197, &#946=100.12(4)&#176 and Z=2. The copper ions, Cu (II), are in a square-planar coordination bound to two nitrogen and two bromine atoms. They are localized in inversion centers. Only one EPR line has been observed due to the collapse of the resonances of the two magnetically inequivalent Cu (II) ions caused by a strong exchange interaction between them. Since nitrogen and bromine have significantly different atomic weights we may not expect an axially symmetric g-tensor as is commonly found in many Cu (II) complexes. In fact, the decomposition of the experimental crystalline g-tensor into two molecular tensors reveals three distinct eigen-values. Furthermore, the axis of the largest molecular eigen-value does not exactly coincide with the normal of the square plane: it is rotated by &#8764 5&#176 toward the bromine atom which characterizes a dx2-y2 ground state with some contribution from a dyz state. Another unusual fact that has been revealed in our studies is the frequency dependence of the g-factor, due to the presence of non-secular contributions to Hamiltonian, which are characteristic for systems with a exchange frequency near the Larmor frequency. In order to determine the exchange factor &#8204J&#8204, we analyzed the angular dependence of the line broadening. In the present work we also included a numerical method for the decomposition of the crystalline g-tensor into molecular ones and compared it with other methods found in the literature.

A associação lipídio/citocromo c é importante e deve ser estudada, pois repercute na atividade peroxidática da proteína abordada e pode contribuir para o processo apoptótico, ou morte programada da célula, e também desempenha um papel significativo na cadeia respiratória. A natureza e a especificidade da interação do citocromo c com bicamadas lipídicas têm sido bastante investigadas ultimamente, mas informações detalhadas e precisas sobre tais assuntos ainda não existem. É aceito que ocorre primeiramente uma interação eletrostática entre a proteína citocromo c e as membranas fosfolipídicas. Em seguida, há uma interação hidrofóbica. Entretanto, ainda não é bem compreendido o papel da cadeia fosfolipídica. A associação do citocromo c com membranas lipídicas induz mudanças no estado de spin do átomo de ferro. A interação entre as vesículas carregadas e o citocromo c induz mudanças estruturais na proteína, as quais são refletidas no seu centro ativo, ou grupo heme. As mudanças do campo cristalino no sítio do ferro hemínico de forte para fraco são acompanhadas por mudanças do estado de spin de baixo para alto, respectivamente. Neste trabalho, estuda-se sistematicamente a natureza da interação entre o citocromo c e a cadeia fosfolipídica. As mudanças estruturais no grupo heme foram correlacionadas com a natureza do lipídio, ou seja, com a carga da cabeça e com o tamanho e o tipo da cadeia fosfolipídica. Foram utilizados treze lipídios diferentes, naturais e sintetizados, com cabeças polares negativas e neutras e com cadeias carbônicas saturadas e insaturadas de diferentes comprimentos. Para tal investigação, utilizamos as técnicas: Ressonância Paramagnética Eletrônica (RPE) Onda Contínua (CW) e Pulsada (PW) e Dicroísmo Circular Magnético (MCD). As técnicas enunciadas avaliam as mudanças de estado de spin e a simetria do citocromo c nos seus estados férrico e ferroso. A interação lipoprotéica lipídio/citocromo c foi avaliada com lipídios diferentes, inclusive com o lipossomo PCPECL, que mimetiza a membrana interna da mitocôndria nos eucariontes. A partir dos resultados experimentais, sugerimos um modelo para esse tipo de associação. / This association lipid/cytochrome c is interesting to study in order to understand the peroxidase activity of this protein, that plays an important role in the respiratory chain and in the apoptosis process or the programmed cell death. The nature and specificity of the interaction of cytochrome c with lipid bilayers have been major goals in recent studies, but detailed information on that issue is not yet widely available. In this regard, it is generally accepted that the electrostatic interaction is an important factor in the association of cytochrome c with phospholipid membranes, followed by a hydrophobic interaction. However, the role played by the phospholipid chain is not well understood. The association of cytochrome c with negative membranes induces a change in the heme iron spin state. The interaction between the charged vesicles and cytochrome c leads to structural changes in the active central or heme group. The changing of the crystalline field of the heme iron from strong to weak is accompanied by spin states changes from low to high spin, respectively. These facts concerned us to investigate more systematically the nature of the interaction between cytochrome c and the phospholipid chains. The lipid-induced effects in the heme iron crystalline field are correlated to the nature of the charged head group and to the size and type of the phospholipid chain. Thirteen different lipids, nature and synthetic, were used, with negative and neutra1 polar head group and saturated and unsaturated acyl chains with different length. This work investigates the change of heme iron spin state and symmetry of ferric cytochrome c using Continuous Wave (CW) and pulsed (PW) Electron Paramagnetic Resonance (EPR) and Magnetic Circular Dichroism (MCD) techniques. These techniques analyze the spin state change and the symmetry of the iron cytochrome c in its ferric and ferrous states. The effect of the different lipids were analyzed, including PCPECL membrane that mimetics the inner mitocondrial membrane in eukaryotes.

O objetivo deste trabalho foi o estudo do íon Fe3+ em monocristais e fibras monocristalinas de LiNbO3, através da técnica espectroscópica da Ressonância Paramagnética Eletrônica (RPE), nas freqüências de 10 e 34GHz, à temperatura ambiente. O Hamiltoniano de Spin para o íon Fe3+ ocupando um sítio de simetria trigonal (C3v) é dado por: H = \'beta\' \'VET.H\' \'VET.g\' \'VET.S\' + \'B20O20+B40O40 . Foram analisadas três amostras de LiNbO3, com diferentes concentrações de Fe3+ e os parâmetros de campo cristalino e fator-g encontrados são: fibra (0.3 mol% de Fe3+) g = 1.9908 \'+OU-\' 0.0002, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.2x10-2 cm-1 , \'B. SUP. 0 INF. 4\' = -7.7\'+OU-\'1.5x10-5cm-1, monocristal 90 (0.22 mol%) g = 2.0043\'+OU-\'0.0002, \'B. SUP. 0 INF. 2\' = 5.35\'+OU-\'0.25x10-2 cm-1, \'B. SUP. 0 INF. 4\'= - 4.03\'+OU-\'1.4x10-5cm-1, monocristal 99 (0.02 mol%) g = 2.0026\'+OU-\'0.0004, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.3x10-2 cm-1, \'B. SUP. 0 INF. 4\' = - 8.33\'+OU-\'1.6x10-5cm-1. Foi medida e analisada a dependência angular da largura das linhas nas duas bandas de freqüências. Através de modelos teóricos (Watanabe, Orbach-Das-Sharma, Spinspin, Spin-spin Spin-órbita) calculamos o parâmetro de desdobramento a campo zero, \'B. SUP. 0 INF. 2\', do estado fundamental do íon Fe3+, para determinar qual o sítio que este íon ocupa no LiNbO3. / We report EPR measurements of Fe3+ ion in bulk LiNbO3 single crystals and in the form of fibers. Spin Hamiltonian for the Fe3+ ion in a trigonal symmetry (C3v) site is given by: H = \'beta\' \'VET.H\' \'VET.g\' \'VET.S\' + \'B20O20+B40O40. Measurements were performed at room temperature and two frequency bands, 10 and 34GHz, using three samples of LiNbO3 with different concentrations of Fe3+ g-factor and the crystal field parameters were found to be: for fiber (0.3 mol% of Fe3+) g = 1.9908 \'+OU-\' 0.0002, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.2x10-2 cm-1 , \'B. SUP. 0 INF. 4\' = -7.7\'+OU-\'1.5x10-5cm-1, for the single crystal 90 (0.22 mol%) g = 2.0043\'+OU-\'0.0002, \'B. SUP. 0 INF. 2\' = 5.35\'+OU \'0.25x10-2 cm-1, \'B. SUP. 0 INF. 4\'= - 4.03\'+OU-\'1.4x10-5 cm-1, and for the single crystal 99 (0.02 mol%) g = 2.0026\'+OU-\'0.0004, \'B. SUP. 0 INF. 2\' = 5.4\'+OU-\'0.3x10-2 cm-1, \'B. SUP. 0 INF. 4\' = - 8.33\'+OU-\'1.6x10-5cm-1. The angular dependence of the line width were also measured and compared with theoretical model. To determine the substitutional site of Fe3+ ion in the LiNbO3 lattice, we calculated the zero field splitting parameter \'B. SUP. 0 INF. 2\' of the ground state, using many theoretical models (Watanabe, Orbach-Das-Sharma, Spin-spin, Spin-Spin Spinorbita).

Foram estudados compósitos poluméricos e vidros fluoroindatos utilizando as espectroscopias de Ressonância Magnética Nuclear (RMN) pulsada e Ressonância Paramagnética Eletrônica (RPE). O estudo de RMN do 1H nos compósitos baseado no polímero polióxido de etileno e partículas de carbono permitiu diferenciar as mobilidades das cadeias poluméricas e identificar as contribuições destas fases. A partir das medidas de RPE foi possível sugerir uma interpretação das interações entre as partículas de carbono nos compósitos. Nos vidros fluoroindatos foi estudado o processo de cristalização, sendo acompanhada sua influência na relaxação nuclear do 19F. A cristalização foi observada por RPE nos vidros dopados com Cu2+, Mn2+ e Gd3+, sendo verificadas as alterações locais causadas por este processo. / Polymeric composites and fluoroindate glasses were studied using pulsed Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. Study of the composite formed by the polymer poly-ethylene oxide and carbon particles allowed us to distinguish the mobilities of polimeric chains and to identify the contributions from different phases. From EPR measurements it was possible to suggest an interpretation of the interactions between carbon particles in the composites. The main objective in the fluoroindate glasses study was to follow the crystallzation process. The 19F NMR measurements allowed to the observation of the influence of this process in the nuclear relaxation. The crystallization was also tracked by EPR spectroscopy in the doped glasses with the paramagnetic ions Cu2+, Mn2+ and Gd3+. This was accomplished by observing the local alterations caused by that process.

A arqueometria é uma área consolidada, com ampla utilização de métodos analíticos nucleares destrutivos e não destrutivos para caracterização, proteção e restauração de peças arqueológicas. O presente projeto teve como objetivo estudar a composição química elementar de amostras de fragmentos cerâmicos encontradas no sítio arqueológico São Paulo II localizado na calha do rio Solimões, próximo ao município de Coari na Amazônia Brasileira. Realizou-se a caracterização das amostras pela determinação de Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Sb, Sm, Rb, Sc, Ta, Tb, Th, U, Yb and Zn por meio da análise por ativação com nêutrons (NAA). A partir da composição química da cerâmica, foi possível definir o agrupamento de amostras em função da similaridade/dissimilaridade da composição química presente no material cerâmico. O agrupamento foi interpretado por métodos estatísticos multivariados como análise de cluster, análise de componentes principais e análise de discriminante. Foram selecionadas, a partir da formação dos grupos, 7 cerâmicas com o objetivo de elaborar o horizonte temporal do sítio, realizado por termoluminescência (TL) e ressonância paramagnética eletrônica (EPR). A temperatura de queima da cerâmica foi determinada em 6 fragmentos por meio da técnica de EPR. Os resultados apresentados neste trabalho podem contribuir com os estudos arqueológicos sobre a dinâmica da ocupação da Amazônia Central anterior à colonização Brasileira. / Archaeometry is currently a well established field in the archaeological sciences. The nuclear method for analysis of chemical elements is one of the important instruments for the characterization of the archaeological materials and has influences on the preservation and restoration. From the chemical and physical analyses it is possible to infer technical processes in ceramics manufacture and tools used by ancient people. Therefore, it contributes to the typology and to understand the roles of materials available in the archaeological sites, such as clays and lythic sources. Evidently, all the archaeological materials and sites are related to people that lived there a long time ago, and studies, as outlined above, reconstruct at least partially the history of such a population. This project aimed at studying the elementary chemical composition of 70 ceramic fragments samples from São Paulo II archaeological site, located along the Solimões River channel, next to Coari city, in Brazilian Amazon. The characterization of samples was performed by neutron activation analysis (NAA). By the determination of 22 elements in the ceramic fragments ( Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Sb, Sm, Rb, Sc, Ta, Tb, Th, U, Yb and Zn), it was possible to define groups of samples regarding the similarity/dissimilarity in elementary chemical composition. For such a task, the multivariate statistical methods employed were cluster analysis (CA), principal component analysis (PCA) and discriminant analysis (DA). Afterwards, seven ceramic fragments have been selected to elaborate the site temporal horizon using thermoluminescence (TL) and electron paramagnetic resonance (EPR) dating results. The EPR technique was also used to find the average firing temperature to produce the ceramics. The results of this research may contribute to the study on the occupation dynamics in the pre-colonial Brazilian Amazon.

Amostras de vidros aluminoboratos de bário contendo impureza de cromo, apresentando proporções de íons Cr POT. 3+, Cr POT 5+ e Cr POT. 6+, determinadas pelas condições oxidantes ou redutoras de fusão, foram preparadas e caracterizadas pelas técnicas de absorção óptica (AO), fluorescência e de ressonância paramagnética eletrônica (RPE). As condições redutoras necessárias para favorecer a obtenção de vidros contendo majoritariamente íons de Cr POT. 3+ foram satisfeitas com a adição de 0,6% em peso de Sb IND. 2 O IND. 3. Nos vidros contendo antimônio, a banda 4 ANTIPOT. T IND. 2 do Cr POT. 3+ aparece ligeiramente deslocada para comprimentos de onda maiores e mais alargada, em relação ao vidro contendo apenas cromo como impureza adicional. O parâmetro de Racah B e a intensidade de campo ligante Ll foram determinados, obtendo-se os valores B = 759 cm-1 e = 15800 cm-1 para o vidro com cromo e antimônio e B = 736 cm-1 e = 16150 cm-1 para o vidro contendo apenas a adição de cromo. Foram observadas antirressonâncias de Fano nos espectros de AO, mais definidas nas amostras sem antimônio. Os espectros de RPE indicam que os íons Cr POT. 3+ isolados estão preferencialmente localizados em sítios distorcidos de simetria octaédrica, apresentando uma linha de absorção em g = 5,15, notando-se também a presença de pares de Cr POT 3+ caracterizados por uma componente da linha em g = 2,0. Com a adição de neodímio, os espectros de AO e de RPE do Cr POT. 3- não sofreram alterações, mas o espectro de fluorescência, com o máximo localizado em 776 nm, foi bastante modificado, mostrando uma diminuição da intensidade em regiões do espectro características da absorção do Nd POT. 3+, indicando a ocorrência de um processo de transferência de energia dos íons Cr POT. 3+ para os íons Nd POT. 3+ nos vidros aluminoboratos de bário, à temperatura ambiente. Os espectros de fluorescência e excitação dos vidros duplamente dopados com cromo e neodímio mostraram o efeito de antiressonâncias de Fano, com o deslocamento de Lamb dos vales associados ao neodímio sobre do Cr POT. 3+. / Barium aluminoborate glass samples containing chromium impurities, presenting Cr3- , Cr5- e Cr6+ íon amounts determined by the oxidizing or reducing melting conditions, have been prepared and characterized by Optical Absorption (OA), fluorescence and Electron Paramagnetic Resonance (EPR) techniques. The reducing conditions necessary to obtain glasses having mainly Cr3+ íons were satisfied with the addition of 0.6 wt% of Sb2 O3 to the batch. In glasses containing antimony, the 4T2 band is wider and shifted towards the higher wavelengths in relation to glass containing only chromium as additional impurity. The Racah parameter B and the ligand field intensity L1 were determined, yielding B = 759 cm-1 and L1 = 15800 cm-1 for the chromium- and antimony-doped glass, and B = 736 cm-1 and L1 = 16150 cm-1 for glass containing only chromium impurity. Fano antiresonances were observed in the OA spectra, better defined in the samples without antimony. The RPE spectra show that the Cr3- ions are preferentially located at distorted octahedral sites. An absorption line was observed at g = 5. 15 and it has been noted also the presence of Cr3+ pairs characterized by a line component at g = 2.0. With the addition of neodymium, the OA and EPR spectra of Cr3+ did not change, but the fluorescence spectrum observed at 776 nm was considerably modified, indicating the occurrence of an energy transfer process from Cr3+ to Nd3- íons in barium aluminoborate glasses at room temperature. The fluorescence and excitation spectra of glasses doped with chromium and neodymium have shown the Fano antiresonance effect, with the Lamb shift of the valleys associated to neodymium over the emission bands ofCr3+.