Marco Aurelio Guimarães - Academia.edu (original) (raw)
Papers by Marco Aurelio Guimarães
Neuro - endocrinology letters, 2005
The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as... more The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as a unified system with integrated functions but anatomically disperse. However, the mechanisms that are involved in the integration of the distant parts of the DNES are poorly known. This study is aimed on the effects of a pinealectomy on the population of the neuroendocrine cells (NECs) in the colon of rats. A group of seven newborn rats and one of adult rats were submitted to a pinealectomy. The animals were sacrificed after 15 days and 90 days, respectively. The control groups of adult and newborn rats were subjected to a 'sham surgery' and then sacrificed after similar periods of time. Paraffin-included sections of the colon samples were stained by the Churukian-Schenk method in order to selectively stain the NECs. The NEC index was estimated by the expression: iNEC = NECs population per crypt/Total cell population of the crypt. The results were expressed as median and absolu...
Revista Brasileira de Odontologia Legal
Neuro endocrinology letters, 2005
OBJECTIVES The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and ... more OBJECTIVES The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as a unified system with integrated functions but anatomically disperse. However, the mechanisms that are involved in the integration of the distant parts of the DNES are poorly known. This study is aimed on the effects of a pinealectomy on the population of the neuroendocrine cells (NECs) in the colon of rats. METHODS A group of seven newborn rats and one of adult rats were submitted to a pinealectomy. The animals were sacrificed after 15 days and 90 days, respectively. The control groups of adult and newborn rats were subjected to a 'sham surgery' and then sacrificed after similar periods of time. Paraffin-included sections of the colon samples were stained by the Churukian-Schenk method in order to selectively stain the NECs. The NEC index was estimated by the expression: iNEC = NECs population per crypt/Total cell population of the crypt. The results were expressed a...
Resumen en: Introduction: Forensic Dentistry is an area of Dentistry related to Law. Among its go... more Resumen en: Introduction: Forensic Dentistry is an area of Dentistry related to Law. Among its goals is the execution of human identification, defined as the process...
Revista Brasileira de Odontologia Legal, 2017
Human Remains and Violence: An Interdisciplinary Journal
Truth commissions are widely recognised tools used in negotiation following political repression.... more Truth commissions are widely recognised tools used in negotiation following political repression. Their work may be underpinned by formal scientific investigation of human remains. This paper presents an analysis of the role of forensic investigations in the transition to democracy following the Brazilian military governments of 1964–85. It considers practices during the dictatorship and in the period following, making reference to analyses of truth commission work in jurisdictions other than Brazil, including those in which the investigation of clandestine burials has taken place. Attempts to conceal the fate of victims during the dictatorship, and the attempts of democratic governments to investigate them are described. Despite various initiatives since the end of the military government, many victims remain unidentified. In Brazil, as elsewhere, forensic investigations are susceptible to political and social influences, leading to a situation in which relatives struggle to obtain...
Revista Brasileira de Odontologia Legal
RGO - Revista Gaúcha de Odontologia
In health care professional activities, advertising is an issue that raises serious discussions a... more In health care professional activities, advertising is an issue that raises serious discussions and is the cause of some ethical suits in professional entities, since every advertising should follow the provisions of the Code of Professional Responsibility. Therefore, this research study aimed at analyzing, comparing and discussing articles related to advertising and marketing, considering the current regulations from dental and medical entities. In Dentistry, this subject is ruled by the Code of Professional Conduct, Chapter XVI, ‘From advertising and marketing’. In Medicine, information is found in two regulations and in several chapters of the Code of Medical Ethics and in Resolution No. 1.974/2011 of the Federal Council of Medicine, which establishes the guiding criteria for medical advertising. The three regulations present articles that refers to participation in mass media, required information in advertisements, use of sensationalism and self-promotion, and publishing of unp...
Forensic Science International
Forensic Science International
Child pornography on the internet is one of the crimes with highest increasing incidence worldwid... more Child pornography on the internet is one of the crimes with highest increasing incidence worldwide. In this specific type of crime, the victim's age has important legal implications. To overcome the lack of scientifically established protocols, European researchers explored and proposed a set of facial proportions obtained from images to estimate age. Within a validation scope, the present study aimed to test the applicability of morphological proportions from frontal photographs of the face to estimate age in a Brazilian population. Standardized frontal view photographs from 800 Brazilians (400 females and 400 males) homogeneously distributed in 4 age groups (6, 10, 14 and 18 years ± 30 days) were randomly selected from a Civilian Database of the Brazilian Federal Police. The selected images were analyzed with the aid of cephalometric landmarks. After landmarking the photographs, eighteen metric relations pre-established by Cattaneo et al. (C. Cattaneo, Z. Obertová, M. Ratnayake, L. Marasciuolo, J. Tutkuviene, P. Poppa, D. Gibelli, P. Gabriel, S. Ritz-Timme, Can facial proportions taken from images be of use for ageing in cases of suspected child pornography? A pilot study, Int. J. Leg. Med. 126 2012 139-144) were assessed and analyzed through parametric statistical tests and discriminant analysis. Two indexes had a moderate correlation with age, while ten had a weak correlation and six were not correlated with age. Eleven indexes were statistically different between sexes (p < 0.05). The discriminant analysis showed that 49.6% of the pooled sample was correctly classified into the respective age group. This percentage increased when each sex was analyzed separately: 50.2% for females and 53.5% for males. The set of facial proportions from frontal images proposed by Cattaneo et al. (2012) is related to facial development. As expected, the discriminant power of this approach did not reach optimal effectiveness in the Brazilian sample. In practice, this age estimation method must be adapted for more reliable application in Brazilians.
Forensic Science International
Human bone histological analysis is a useful tool to assess post mortem diagenesis and to predict... more Human bone histological analysis is a useful tool to assess post mortem diagenesis and to predict successful nuclear DNA typing of forensic material. This study is part of a series of studies developed by the authors intended to improve the understanding of post mortem diagenesis and to develop applications for DNA analysis of skeletal species from tropical soils, in order to optimize genetic and anthropological protocols. The aim of this study was to analyze the impact of burial period on the integrity of exhumed compact bone microstructure from tropical climate. In fragments of exhumed human femora from 39 individuals from the same cemetery (exhumed group) and 5 fresh femora from routine autopsies (control group), sections stained by hematoxylin-eosin were analyzed in order to measure bone microstructural integrity. We found that bone integrity index in exhumed group was negatively influenced by the period of burial (r = -0.37, p < 0.05) and highly significantly decreased (p < 0.0001) in comparison to control group. The period of burial and nitric acid decalcification time was positively correlated (r = 0.51; p < 0.01), leading to imply a bone petrification process during inhumation. Exhumed group showed higher level of matrix bone loss (p < 0.001), as expected, and 87% of cases analyzed were "tunneled" as described by Hackett. Bone integrity index and bone matrix tend to decrease in bones buried in tropical soil between 8-14 years of inhumation. This period is short if we consider cases in which there are preserved bones interred for longer periods in other environments. These data must be considered in cases where genetic identification of exhumed skeletons from tropical environment is required. The diagenesis in these bones and the variations of results found are discussed, clarifying some challenges for forensic laboratories, especially in DNA analysis.
Forensic Science International
Human Remains and Violence: An Interdisciplinary Journal
Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of law... more Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of lawfully buried or – occasionally – cremated individuals, as distinct from forensic excavations of clandestinely buried remains conducted as part of a criminal investigation and from unlawful disinterment of human remains, commonly referred to as bodysnatching. The aim of this article is to review the role of exhumation – so defined – in the activities of CEMEL, the Medico-Legal Centre of the Ribeirão Preto Medical School-University of São Paulo, in international, regional and local collaborations. Exhumations form part of routine forensic anthropology casework; scientific research in physical and forensic anthropology; and forensic casework conducted in collaboration with the Brazilian Federal Police; and are carried out as part of humanitarian investigations into deaths associated with the civil–military dictatorship of 1964 to 1985. This article aims to offer a non-technical summary – wi...
Forensic Science International, 2017
Validation of a standard forensic anthropology examination protocol by measurement of applicabili... more Validation of a standard forensic anthropology examination protocol by measurement of applicability and reliability on exhumed and archive samples of known biological attribution. Forensic Science International in press.. Validation of a standard forensic anthropology examination protocol by measurement of applicability and reliability on exhumed and archive samples of known biological attribution. Forensic Science International in press.
PloS one, 2017
The study of facial growth is explored in many fields of science, including anatomy, genetics, an... more The study of facial growth is explored in many fields of science, including anatomy, genetics, and forensics. In the field of forensics, it acts as a valuable tool for combating child pornography. The present research proposes a new method, based on relative measurements and fixed references of the human face-specifically considering measurements of the diameter of the iris (iris ratio)-for the analysis of facial growth in association with age in children and sub-adults. The experimental sample consisted of digital photographs of 1000 Brazilian subjects, aged between 6 and 22 years, distributed equally by sex and divided into five specific age groups (6, 10, 14, 18, and 22 year olds ± one month). The software package SAFF-2D® (Forensic Facial Analysis System, Brazilian Federal Police, Brazil) was used for positioning 11 landmarks on the images. Ten measurements were calculated and used as fixed references to evaluate the growth of the other measurements for each age group, as well t...
Human Remains and Violence, 2017
Truth commissions are widely recognised tools used in negotiation following political repression.... more Truth commissions are widely recognised tools used in negotiation following political repression. Their work may be underpinned by formal scientific investigation of human remains. This paper presents an analysis of the role of forensic investigations in the transition to democracy following the Brazilian military governments of 1964-1985. It considers practices during the dictatorship and in the period following, making reference to analyses of truth commission work in jurisdictions other than Brazil, including those in which the investigation of clandestine burials has taken place. Attempts to conceal the fate of victims during the dictatorship and of democratic governments to investigate them are described. Despite various initiatives since the end of the military government, many victims remain unidentified. In Brazil, as elsewhere, forensic investigations are susceptible to political and social influences, leading to a situation in which relatives struggle to obtain meaningful ...
Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of law... more Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of lawfully buried or – occasionally – cremated individuals, as distinct from forensic excavations of clandestinely buried remains conducted as part of a criminal investigation and from unlawful disinterment of human remains, commonly referred to as ‘bodysnatching’. The aim of this article is to review the role of exhumation – so defined – in the activities of CEMEL, the Medico-Legal Centre of the Ribeirão Preto Medical School-University of São Paulo, in international, regional and local collaborations. Exhumations form part of routine forensic anthropology casework; scientific research in physical and forensic anthropology; and forensic casework conducted in collaboration with the Brazilian Federal Police; and are carried out as part of humanitarian investigations into deaths associated with the civil–military dictatorship of 1964 to 1985. This article aims to offer a non-technical summary – ...
Revista do Museu de Arqueologia e Etnologia, 2009
Taphonomic processes affecting bone post mortem are important in forensic, archaeological and pal... more Taphonomic processes affecting bone post mortem are important in forensic, archaeological and palaeontological investigations. In this study, the application of tissue microarray (TMA) analysis to a sample of femoral bone specimens from 20 exhumed individuals of known period of burial and age at death is described. TMA allows multiplexing of subsamples, permitting standardized comparative analysis of adjacent sections in 3-D and of representative cross-sections of a large number of specimens. Standard hematoxylin and eosin, periodic acid-Schiff and silver methenamine, and picrosirius red staining, and CD31 and CD34 immunohistochemistry were applied to TMA sections. Osteocyte and osteocyte lacuna counts, percent bone matrix loss, and fungal spheroid element counts could be measured and collagen fibre bundles observed in all specimens. Decalcification with 7% nitric acid proceeded more rapidly than with 0.5 M EDTA and may offer better preservation of histological and cellular structur...
Neuro - endocrinology letters, 2005
The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as... more The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as a unified system with integrated functions but anatomically disperse. However, the mechanisms that are involved in the integration of the distant parts of the DNES are poorly known. This study is aimed on the effects of a pinealectomy on the population of the neuroendocrine cells (NECs) in the colon of rats. A group of seven newborn rats and one of adult rats were submitted to a pinealectomy. The animals were sacrificed after 15 days and 90 days, respectively. The control groups of adult and newborn rats were subjected to a 'sham surgery' and then sacrificed after similar periods of time. Paraffin-included sections of the colon samples were stained by the Churukian-Schenk method in order to selectively stain the NECs. The NEC index was estimated by the expression: iNEC = NECs population per crypt/Total cell population of the crypt. The results were expressed as median and absolu...
Revista Brasileira de Odontologia Legal
Neuro endocrinology letters, 2005
OBJECTIVES The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and ... more OBJECTIVES The diffuse neuroendocrine system (DNES) participates in the systemic homeostasis and may work as a unified system with integrated functions but anatomically disperse. However, the mechanisms that are involved in the integration of the distant parts of the DNES are poorly known. This study is aimed on the effects of a pinealectomy on the population of the neuroendocrine cells (NECs) in the colon of rats. METHODS A group of seven newborn rats and one of adult rats were submitted to a pinealectomy. The animals were sacrificed after 15 days and 90 days, respectively. The control groups of adult and newborn rats were subjected to a 'sham surgery' and then sacrificed after similar periods of time. Paraffin-included sections of the colon samples were stained by the Churukian-Schenk method in order to selectively stain the NECs. The NEC index was estimated by the expression: iNEC = NECs population per crypt/Total cell population of the crypt. The results were expressed a...
Resumen en: Introduction: Forensic Dentistry is an area of Dentistry related to Law. Among its go... more Resumen en: Introduction: Forensic Dentistry is an area of Dentistry related to Law. Among its goals is the execution of human identification, defined as the process...
Revista Brasileira de Odontologia Legal, 2017
Human Remains and Violence: An Interdisciplinary Journal
Truth commissions are widely recognised tools used in negotiation following political repression.... more Truth commissions are widely recognised tools used in negotiation following political repression. Their work may be underpinned by formal scientific investigation of human remains. This paper presents an analysis of the role of forensic investigations in the transition to democracy following the Brazilian military governments of 1964–85. It considers practices during the dictatorship and in the period following, making reference to analyses of truth commission work in jurisdictions other than Brazil, including those in which the investigation of clandestine burials has taken place. Attempts to conceal the fate of victims during the dictatorship, and the attempts of democratic governments to investigate them are described. Despite various initiatives since the end of the military government, many victims remain unidentified. In Brazil, as elsewhere, forensic investigations are susceptible to political and social influences, leading to a situation in which relatives struggle to obtain...
Revista Brasileira de Odontologia Legal
RGO - Revista Gaúcha de Odontologia
In health care professional activities, advertising is an issue that raises serious discussions a... more In health care professional activities, advertising is an issue that raises serious discussions and is the cause of some ethical suits in professional entities, since every advertising should follow the provisions of the Code of Professional Responsibility. Therefore, this research study aimed at analyzing, comparing and discussing articles related to advertising and marketing, considering the current regulations from dental and medical entities. In Dentistry, this subject is ruled by the Code of Professional Conduct, Chapter XVI, ‘From advertising and marketing’. In Medicine, information is found in two regulations and in several chapters of the Code of Medical Ethics and in Resolution No. 1.974/2011 of the Federal Council of Medicine, which establishes the guiding criteria for medical advertising. The three regulations present articles that refers to participation in mass media, required information in advertisements, use of sensationalism and self-promotion, and publishing of unp...
Forensic Science International
Forensic Science International
Child pornography on the internet is one of the crimes with highest increasing incidence worldwid... more Child pornography on the internet is one of the crimes with highest increasing incidence worldwide. In this specific type of crime, the victim's age has important legal implications. To overcome the lack of scientifically established protocols, European researchers explored and proposed a set of facial proportions obtained from images to estimate age. Within a validation scope, the present study aimed to test the applicability of morphological proportions from frontal photographs of the face to estimate age in a Brazilian population. Standardized frontal view photographs from 800 Brazilians (400 females and 400 males) homogeneously distributed in 4 age groups (6, 10, 14 and 18 years ± 30 days) were randomly selected from a Civilian Database of the Brazilian Federal Police. The selected images were analyzed with the aid of cephalometric landmarks. After landmarking the photographs, eighteen metric relations pre-established by Cattaneo et al. (C. Cattaneo, Z. Obertová, M. Ratnayake, L. Marasciuolo, J. Tutkuviene, P. Poppa, D. Gibelli, P. Gabriel, S. Ritz-Timme, Can facial proportions taken from images be of use for ageing in cases of suspected child pornography? A pilot study, Int. J. Leg. Med. 126 2012 139-144) were assessed and analyzed through parametric statistical tests and discriminant analysis. Two indexes had a moderate correlation with age, while ten had a weak correlation and six were not correlated with age. Eleven indexes were statistically different between sexes (p < 0.05). The discriminant analysis showed that 49.6% of the pooled sample was correctly classified into the respective age group. This percentage increased when each sex was analyzed separately: 50.2% for females and 53.5% for males. The set of facial proportions from frontal images proposed by Cattaneo et al. (2012) is related to facial development. As expected, the discriminant power of this approach did not reach optimal effectiveness in the Brazilian sample. In practice, this age estimation method must be adapted for more reliable application in Brazilians.
Forensic Science International
Human bone histological analysis is a useful tool to assess post mortem diagenesis and to predict... more Human bone histological analysis is a useful tool to assess post mortem diagenesis and to predict successful nuclear DNA typing of forensic material. This study is part of a series of studies developed by the authors intended to improve the understanding of post mortem diagenesis and to develop applications for DNA analysis of skeletal species from tropical soils, in order to optimize genetic and anthropological protocols. The aim of this study was to analyze the impact of burial period on the integrity of exhumed compact bone microstructure from tropical climate. In fragments of exhumed human femora from 39 individuals from the same cemetery (exhumed group) and 5 fresh femora from routine autopsies (control group), sections stained by hematoxylin-eosin were analyzed in order to measure bone microstructural integrity. We found that bone integrity index in exhumed group was negatively influenced by the period of burial (r = -0.37, p < 0.05) and highly significantly decreased (p < 0.0001) in comparison to control group. The period of burial and nitric acid decalcification time was positively correlated (r = 0.51; p < 0.01), leading to imply a bone petrification process during inhumation. Exhumed group showed higher level of matrix bone loss (p < 0.001), as expected, and 87% of cases analyzed were "tunneled" as described by Hackett. Bone integrity index and bone matrix tend to decrease in bones buried in tropical soil between 8-14 years of inhumation. This period is short if we consider cases in which there are preserved bones interred for longer periods in other environments. These data must be considered in cases where genetic identification of exhumed skeletons from tropical environment is required. The diagenesis in these bones and the variations of results found are discussed, clarifying some challenges for forensic laboratories, especially in DNA analysis.
Forensic Science International
Human Remains and Violence: An Interdisciplinary Journal
Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of law... more Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of lawfully buried or – occasionally – cremated individuals, as distinct from forensic excavations of clandestinely buried remains conducted as part of a criminal investigation and from unlawful disinterment of human remains, commonly referred to as bodysnatching. The aim of this article is to review the role of exhumation – so defined – in the activities of CEMEL, the Medico-Legal Centre of the Ribeirão Preto Medical School-University of São Paulo, in international, regional and local collaborations. Exhumations form part of routine forensic anthropology casework; scientific research in physical and forensic anthropology; and forensic casework conducted in collaboration with the Brazilian Federal Police; and are carried out as part of humanitarian investigations into deaths associated with the civil–military dictatorship of 1964 to 1985. This article aims to offer a non-technical summary – wi...
Forensic Science International, 2017
Validation of a standard forensic anthropology examination protocol by measurement of applicabili... more Validation of a standard forensic anthropology examination protocol by measurement of applicability and reliability on exhumed and archive samples of known biological attribution. Forensic Science International in press.. Validation of a standard forensic anthropology examination protocol by measurement of applicability and reliability on exhumed and archive samples of known biological attribution. Forensic Science International in press.
PloS one, 2017
The study of facial growth is explored in many fields of science, including anatomy, genetics, an... more The study of facial growth is explored in many fields of science, including anatomy, genetics, and forensics. In the field of forensics, it acts as a valuable tool for combating child pornography. The present research proposes a new method, based on relative measurements and fixed references of the human face-specifically considering measurements of the diameter of the iris (iris ratio)-for the analysis of facial growth in association with age in children and sub-adults. The experimental sample consisted of digital photographs of 1000 Brazilian subjects, aged between 6 and 22 years, distributed equally by sex and divided into five specific age groups (6, 10, 14, 18, and 22 year olds ± one month). The software package SAFF-2D® (Forensic Facial Analysis System, Brazilian Federal Police, Brazil) was used for positioning 11 landmarks on the images. Ten measurements were calculated and used as fixed references to evaluate the growth of the other measurements for each age group, as well t...
Human Remains and Violence, 2017
Truth commissions are widely recognised tools used in negotiation following political repression.... more Truth commissions are widely recognised tools used in negotiation following political repression. Their work may be underpinned by formal scientific investigation of human remains. This paper presents an analysis of the role of forensic investigations in the transition to democracy following the Brazilian military governments of 1964-1985. It considers practices during the dictatorship and in the period following, making reference to analyses of truth commission work in jurisdictions other than Brazil, including those in which the investigation of clandestine burials has taken place. Attempts to conceal the fate of victims during the dictatorship and of democratic governments to investigate them are described. Despite various initiatives since the end of the military government, many victims remain unidentified. In Brazil, as elsewhere, forensic investigations are susceptible to political and social influences, leading to a situation in which relatives struggle to obtain meaningful ...
Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of law... more Exhumation may be defined as the legally sanctioned excavation and recovery of the remains of lawfully buried or – occasionally – cremated individuals, as distinct from forensic excavations of clandestinely buried remains conducted as part of a criminal investigation and from unlawful disinterment of human remains, commonly referred to as ‘bodysnatching’. The aim of this article is to review the role of exhumation – so defined – in the activities of CEMEL, the Medico-Legal Centre of the Ribeirão Preto Medical School-University of São Paulo, in international, regional and local collaborations. Exhumations form part of routine forensic anthropology casework; scientific research in physical and forensic anthropology; and forensic casework conducted in collaboration with the Brazilian Federal Police; and are carried out as part of humanitarian investigations into deaths associated with the civil–military dictatorship of 1964 to 1985. This article aims to offer a non-technical summary – ...
Revista do Museu de Arqueologia e Etnologia, 2009
Taphonomic processes affecting bone post mortem are important in forensic, archaeological and pal... more Taphonomic processes affecting bone post mortem are important in forensic, archaeological and palaeontological investigations. In this study, the application of tissue microarray (TMA) analysis to a sample of femoral bone specimens from 20 exhumed individuals of known period of burial and age at death is described. TMA allows multiplexing of subsamples, permitting standardized comparative analysis of adjacent sections in 3-D and of representative cross-sections of a large number of specimens. Standard hematoxylin and eosin, periodic acid-Schiff and silver methenamine, and picrosirius red staining, and CD31 and CD34 immunohistochemistry were applied to TMA sections. Osteocyte and osteocyte lacuna counts, percent bone matrix loss, and fungal spheroid element counts could be measured and collagen fibre bundles observed in all specimens. Decalcification with 7% nitric acid proceeded more rapidly than with 0.5 M EDTA and may offer better preservation of histological and cellular structur...