Max Leitao | Universidade Eduardo Mondlane (original) (raw)
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Papers by Max Leitao
Revista Brasileira De Medicina Do Esporte, 2005
... Carlos Alberto Neder; Carlos Eduardo Negrão; Cláudio Gil Soares Araújo, Fábio Sândoli de ... ... more ... Carlos Alberto Neder; Carlos Eduardo Negrão; Cláudio Gil Soares Araújo, Fábio Sândoli de ... Janieire Nazaré Nunes Alves; Max Grinberg; Miltom Godoy; Odwaldo Barbosa e Silva ... Costa; Romeu Sergio Meneghelo; Ruy Silveira Moraes; Salvador Manoel Serra ; Salvador Ramos. ...
Biotechnology Letters, 2010
An acid phosphatase from Trichoderma harzianum was purified in a single step using a phenyl-Sepha... more An acid phosphatase from Trichoderma harzianum was purified in a single step using a phenyl-Sepharose chromatography column. A typical procedure showed 22-fold purification with 56% yield. The purified enzyme showed as a single band on SDS-PAGE with an apparent molecular weight of 57.8 kDa. The pH optimum was 4.8 and maximum activity was obtained at 55°C. The enzyme retained 60% of its activity after incubation at 55°C for 60 min. The K m and V max values for p-nitrophenyl phosphate (p-NPP) as a substrate were 165 nM and 237 nM min−1, respectively. The enzyme was partially inhibited by inorganic phosphate and strongly inhibited by tungstate. Broad substrate specificity was observed with significant activities for p-NPP, ATP, ADP, AMP, fructose 6-phosphate, glucose 1-phosphate and phenyl phosphate.
Applied Mathematics and Computation, 2008
We investigate modified steepest-descent methods coupled with a loping Kaczmarz strategy for obta... more We investigate modified steepest-descent methods coupled with a loping Kaczmarz strategy for obtaining stable solutions of nonlinear systems of ill-posed operator equations. We show that the proposed method is a convergent regularization method. Numerical tests are presented for a linear problem related to photoacoustic tomography and a nonlinear problem related to the testing of semiconductor devices.
Behavioral Ecology and Sociobiology, 2000
A previous study of geographic variation in blue tit (Parus caeruleus) song structure showed that... more A previous study of geographic variation in blue tit (Parus caeruleus) song structure showed that changes in blue tit song syntax (i.e. presence/absence of a trill) are correlated with the breeding density of a close competitor, the great tit (P. major), and are not correlated with other environmental factors such as vegetation structure or blue tit breeding density. We tested the hypothesis that blue tit trilled song represents a character shift that evolved because it reduced territorial interactions with more dominant great tits. We conducted five sets of playback trials in three study populations (mainland southern France, Corsica and Denmark) presenting male great tits with blue tit trilled and untrilled songs and great tit songs. We found that great tits respond equally strongly to both blue tit untrilled songs and to great tit songs, but show a significantly weaker response to blue tit trilled songs. These findings are the first experimental evidence that interspecific competition may play an important role in macrogeographic variation of bird song.
Physical Review B, 2010
We analyze the scanning tunneling microscopy (STM) signatures for the O/Cu3Au(100) surface from t... more We analyze the scanning tunneling microscopy (STM) signatures for the O/Cu3Au(100) surface from the low-coverage (isolated impurity) to high-coverage (oxide) regimes. First-principles calculations show that oxygen signatures switch from dark to bright spots as the oxygen coverage increases. This behavior is nicely traced back to a change in the oxygen orbital character of the Fermi-level electronic states. Our results allow for the chemical identification by STM of oxygen and copper atoms in the fully ordered O/Cu3Au(100)-c(2×2) surface.
Revista Brasileira De Medicina Do Esporte, 2005
... Carlos Alberto Neder; Carlos Eduardo Negrão; Cláudio Gil Soares Araújo, Fábio Sândoli de ... ... more ... Carlos Alberto Neder; Carlos Eduardo Negrão; Cláudio Gil Soares Araújo, Fábio Sândoli de ... Janieire Nazaré Nunes Alves; Max Grinberg; Miltom Godoy; Odwaldo Barbosa e Silva ... Costa; Romeu Sergio Meneghelo; Ruy Silveira Moraes; Salvador Manoel Serra ; Salvador Ramos. ...
Biotechnology Letters, 2010
An acid phosphatase from Trichoderma harzianum was purified in a single step using a phenyl-Sepha... more An acid phosphatase from Trichoderma harzianum was purified in a single step using a phenyl-Sepharose chromatography column. A typical procedure showed 22-fold purification with 56% yield. The purified enzyme showed as a single band on SDS-PAGE with an apparent molecular weight of 57.8 kDa. The pH optimum was 4.8 and maximum activity was obtained at 55°C. The enzyme retained 60% of its activity after incubation at 55°C for 60 min. The K m and V max values for p-nitrophenyl phosphate (p-NPP) as a substrate were 165 nM and 237 nM min−1, respectively. The enzyme was partially inhibited by inorganic phosphate and strongly inhibited by tungstate. Broad substrate specificity was observed with significant activities for p-NPP, ATP, ADP, AMP, fructose 6-phosphate, glucose 1-phosphate and phenyl phosphate.
Applied Mathematics and Computation, 2008
We investigate modified steepest-descent methods coupled with a loping Kaczmarz strategy for obta... more We investigate modified steepest-descent methods coupled with a loping Kaczmarz strategy for obtaining stable solutions of nonlinear systems of ill-posed operator equations. We show that the proposed method is a convergent regularization method. Numerical tests are presented for a linear problem related to photoacoustic tomography and a nonlinear problem related to the testing of semiconductor devices.
Behavioral Ecology and Sociobiology, 2000
A previous study of geographic variation in blue tit (Parus caeruleus) song structure showed that... more A previous study of geographic variation in blue tit (Parus caeruleus) song structure showed that changes in blue tit song syntax (i.e. presence/absence of a trill) are correlated with the breeding density of a close competitor, the great tit (P. major), and are not correlated with other environmental factors such as vegetation structure or blue tit breeding density. We tested the hypothesis that blue tit trilled song represents a character shift that evolved because it reduced territorial interactions with more dominant great tits. We conducted five sets of playback trials in three study populations (mainland southern France, Corsica and Denmark) presenting male great tits with blue tit trilled and untrilled songs and great tit songs. We found that great tits respond equally strongly to both blue tit untrilled songs and to great tit songs, but show a significantly weaker response to blue tit trilled songs. These findings are the first experimental evidence that interspecific competition may play an important role in macrogeographic variation of bird song.
Physical Review B, 2010
We analyze the scanning tunneling microscopy (STM) signatures for the O/Cu3Au(100) surface from t... more We analyze the scanning tunneling microscopy (STM) signatures for the O/Cu3Au(100) surface from the low-coverage (isolated impurity) to high-coverage (oxide) regimes. First-principles calculations show that oxygen signatures switch from dark to bright spots as the oxygen coverage increases. This behavior is nicely traced back to a change in the oxygen orbital character of the Fermi-level electronic states. Our results allow for the chemical identification by STM of oxygen and copper atoms in the fully ordered O/Cu3Au(100)-c(2×2) surface.