Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Ricardo Jorge Cruz Lima"'
Publikováno v:
Crystals, Vol 9, Iss 10, p 517 (2019)
In this work we present the continuation of studies carried out on the changes of geometric parameters of the hydrogen bonds in amino acid crystals subjected to temperature or pressure variations. Changes in geometric parameters of the hydrogen bonds
Externí odkaz:
https://doaj.org/article/db63dc47e0cc4f2a9969c7be1c7dbe04
Autor:
André Luís de Oliveira Cavaignac, Rilleands Alves Soares, Ricardo Jorge Cruz Lima, Pedro de Freitas Façanha Filhoo, Paulo de Tarso Cavalcante Freire
Publikováno v:
Crystals, Vol 8, Iss 6, p 245 (2018)
Single-crystal samples of the semi-organic compounds mono-l-alaninium nitrate and monoglycine nitrate have been studied by Raman spectroscopy in a diamond-anvil cell up to 5.5 GPa, in order to observe the behavior of the deformation mode of NH3 units
Externí odkaz:
https://doaj.org/article/c0e2b0b035484ea582bf396d52b310a2
Autor:
Ricardo Jorge Cruz Lima, Antonio Alamo Feitosa Saraiva, Silvania Lanfredi, Marcos Augusto de Lima Nobre, Paulo de Tarso Cavalcante Freire, José Marcos Sasaki
Publikováno v:
Química Nova, Vol 30, Iss 1, Pp 22-24 (2007)
The study of fossils has made considerable progress over the last years as a result of the use of new experimental techniques. This paper describes the chemical composition of a fossilized fish of the Cretaceous period, from a 100 million-year-old, m
Externí odkaz:
https://doaj.org/article/df0a581aa1a7415d9f8313bf77414758
Autor:
Ricardo Jorge Cruz Lima, Paulo de Tarso Cavalcante Freire, José Marcos Sasaki, Antonio Álamo Feitosa Saraiva, Silvania Lanfredi, Marcos Augusto de Lima Nobre
Publikováno v:
Química Nova, Vol 30, Iss 8, Pp 1956-1958 (2007)
Coprolites are fossilized faeces that constitute an important source of palaeobiological informations. This paper describes the characterization of some coprolite materials originated from the Romualdo Member of the Santana Formation (Araripe Basin,
Externí odkaz:
https://doaj.org/article/cd656f174db94aef89e9e4e7623f2728
Autor:
Ricardo Jorge Cruz Lima, Antonio Jeferson de Deus Moreno, Solange Fernanda Loureiro de Castro, José de Ribamar Santos Gonçalves, Antonio Benedito de Olivera, José Marcos Sasaki, Paulo de Tarso Cavalcante Freire
Publikováno v:
Química Nova, Vol 29, Iss 3, Pp 507-509 (2006)
Externí odkaz:
https://doaj.org/article/14e210e59f3341dd802e2c0a8fab22ec
Publikováno v:
Crystals, Vol 9, Iss 10, p 517 (2019)
Crystals
Volume 9
Issue 10
Crystals
Volume 9
Issue 10
In this work we present the continuation of studies carried out on the changes of geometric parameters of the hydrogen bonds in amino acid crystals subjected to temperature or pressure variations. Changes in geometric parameters of the hydrogen bonds
Autor:
F. E. A. Melo, Paulo Freire, P.F. Façanha Filho, José Albérsio de Araújo Lima, Ricardo Jorge Cruz Lima, Heloisa N. Bordallo, J. Mendes Filho, G.P. De Sousa
Publikováno v:
Journal of Raman Spectroscopy. 41:808-813
Raman spectra of DL-Alanine crystals were investigated in the 50–3200 cm−1 spectral region for temperatures ranging from 15 to 295 K. The crystalline structure of DL-Alanine represents a rare example of an amino acid racemate crystallizing in a n
Autor:
Ricardo Jorge Cruz Lima, F. E. A. Melo, José Albérsio de Araújo Lima, R. O. Gonçalves, J. Mendes Filho, Heloisa N. Bordallo, Paulo Freire, Dimitri N. Argyriou
Publikováno v:
Journal of Raman Spectroscopy. 40:958-963
Raman spectra of deuterated L-alanine have been obtained at high-pressure conditions. A phase transition at ∼1.5 GPa associated with the splitting of some internal modes and increase of the wavenumber of the external modes was observed. Similarly t
Publikováno v:
Vibrational Spectroscopy. 45:99-102
Raman spectra of l -alanine, l -threonine and taurine amino acids crystals under high-pressure conditions at room temperature were investigated in a diamond anvil cell in order to observe the behavior of the torsional mode of NH 3 unit. It was observ
Autor:
Paulo Freire, Ricardo Ferreira Bento, A.M.R. Teixeira, G. M. M. S. Mourão, V. Lemos, Ricardo Jorge Cruz Lima, F. M. Pontes, M. C. F. de Oliveira, Jair Mafezoli
Publikováno v:
Journal of Raman Spectroscopy. 38:1615-1621
Seselin, C14H12O3, is a coumarin which crystallizes in a monoclinic structure P21/b(C2h5) with four molecules per unit cell. In a Fourier-transform Raman spectroscopic study performed at room temperature, several normal modes were observed. Vibration