An assessment of early mandibular growth

Quantification of skeletal data has been shown to be an effective and reliable method of demonstrating variation in human growth as well as for monitoring and interpreting growth. In South Africa as well as internationally, few researchers have assessed mandibular growth in late fetal period and early childhood and therefore standards for growth and age determination in these groups are limited. The purpose of this study was to evaluate growth in the mandible from the period of 31 gestational weeks to 36 months postnatal. A total of 74 mandibles were used. Dried mandibles were sourced from the Raymond A. Dart Collection (University of Witwatersrand), and cadaveric remains were obtained from the Universities of Pretoria and the Witwatersrand. The sample was divided into four groups; 31-40 gestational weeks (group 1), 0-11 months (group 2), 12-24 months (group 3), and 25-36 months (group 4). Twenty-one osteological landmarks were digitized using a MicroScribe G2. Ten standard measurements were created and included: the maximum length of mandible, mandibular body length and width, mandibular notch width and depth, mental foramen to inferior border of mandible, mandibular basilar widths bigonial and biantegonial, bigonial width of mental foramen and mental angle. Data were analyzed using PAST statistical software and Morphologika2 v2.5. Statistically significant differences were noted in the linear measurements for all group comparisons except between groups 3 and 4. The mandible morphologically changed from a round, smooth contour anteriorly to adopt a more sharp and narrow adult shape. A progressive increase in the depth and definition of the mandibular arch was also noted. In conclusion, the mandible initially grows to accommodate the developing tongue (up to 11 months), progressive dental eruption and mastication from 12 to 36 months. Mastication is associated with muscle mass development; this would necessitate an increase in the dimensions of the mandibular notch and associated muscle attachment sites. These findings might be valuable in the estimation of age in unidentified individuals and to monitor prenatal growth of the mandible for the early diagnosis of conditions associated with stunted mandibular growth.     

Human coxal bone sexual dimorphism and multislice computed tomography: geometric morphometric analysis of 65 adults

The authors studied sexually dimorphic differences in coxal shape using geometric morphometric analysis of 15 osteometric landmarks recorded by multislice computed tomography (MSCT), based on three-dimensional reconstructions of 65 Caucasian adults. Geometric morphometric analysis, principal component analysis, canonical variates analysis, and other discriminant analysis (Goodall's F-test and Mahalanobis distance) were performed for the three separate bones of the left innominate (pubis, ilium, and ischium), the modified pubis (pubis and ischiopubic ramus), the modified ilium (ilium and ischial spine), three bone complexes (ischiopubic, iliopubic, and ilio-ischial), and the complete innominate. A cross-validation test was also performed. All areas studied were dimorphic, but results for sexual dimorphism in decreasing order were as follows: the modified pubis, followed by the ischiopubic complex, the iliopubic complex and the complete innominate, the pubis, the modified ilium, the ilio-ischial complex, the ilium, and finally the ischium. These results show the potential of this approach for future anthropological research.     

Haplotypic blocks of X-linked STRs for forensic cases: study of recombination and mutation rates

In complex kinship cases, markers situated in haplotypic blocks may provide additional clues to other unlinked markers. We have established a protocol to amplify six X-chromosome microsatellites, located in two haplotype blocks, using PCR with fluorochrome-labeled primers and capillary electrophoresis. The segregation stability was explored in 92 unrelated families with individuals from three generations. Sixty-one different haplotypes were found in the DXS10079-DXS10074-DXS10075 block in the grandfathers and 96 in the mothers, with estimated haplotype diversities of 0.9828 and 0.9842, respectively. Fifty and 73 different haplotypes were found in the DXS6801-DXS6809-DXS6789 block in the grandfathers and the mothers, with estimated haplotype diversities of 0.9711 and 0.9742, respectively. We observed 10 between-cluster and one within-cluster recombinations in 99 female meioses. The overall per-locus mutation rate was 0.0034. This protocol allows for the characterization of the alleles of two sets of linked markers of the X-chromosome that can be useful in complex forensic cases.     

Working in High School and Adaptation in the Transition to Young Adulthood among African American Youth

Researchers have found mixed support for documenting whether work is protective or harmful during adolescence. This study examined the association between work and problem behaviors among African American youth (N = 592; 53% female; M = 14.8 years, SD = .60) followed from mid-adolescence to young adulthood over eight Waves (90% response rate over the first four Waves and a 68% response rate across all eight Waves). We explored three competing operationalizations of work: work history (never worked, worked), work intensity (no work, 20 h or less, and 21 h or over), and work trajectories (never worked, episodic work, stopped working, late starter, and consistent worker). Non-working youth reported higher marijuana use during young adulthood than their working counterparts. Nonworkers reported lower self-acceptance during young adulthood than those working greater number of hours per week. Differences in work trajectories for cigarette use, depression, and anxiety during adolescence imply that when and for how long youth work are also important factors to explore. Our findings lend tentative support to the work benefits perspective and suggest that the association between work and problem behaviors may depend on the work measure used. We discuss the implications of employing different work measures in adolescent research.

Virtual anthropology and forensic identification: report of one case

A charred body was found after a fire in a house in a mountainous region of France. The body was severely burned and was not formally identified as the owner of the house. Autopsy was carried out to seek vital reactions and/or traumatic lesions and to identify the corpse. Before bone preparation and after autopsy, multislice computed tomography (MSCT) was performed in order to assess the potential of the technique for radiological anthropological bone identification. The challenge was to determine as accurately as possible the sex, age, ante-mortem stature and ethnic of the victim using both MSCT and conventional bone study. The results of the two techniques were compared. MSCT provided an answer to all the questions, whereas bone study did not. To the best of our knowledge, this case is the first to use MSCT for forensic anthropological study and illustrates the potential contribution of this technique in this field.     

Predictors of adult attitudes toward corporal punishment of children

This study identifies predictors of favorable attitudes toward spanking. Analyses were performed with survey data collected from a representative sample of 1,000 adults from Quebec, Canada. According to this survey, a majority of respondents endorsed spanking, despite their recognition of potential harm associated with corporal punishment (CP) of children. The prediction model of attitudes toward spanking included demographics, experiencing or witnessing various forms of family violence and abuse in childhood, and perceived frequency of physical injuries resulting from CP. Spanking was the most reported childhood experience (66.4%), and most violence and abuse predictors were significantly and positively correlated. Older respondents who were spanked in childhood and who believed that spanking never or seldom results in physical injuries were the most in favor of spanking. On the other hand, respondents who reported more severe physical violence or psychological abuse in childhood were less in favor of spanking. Findings are discussed in terms of prevention of CP and family coercion cycle.     

Haplotype frequencies of eight Y-chromosome short tandem repeats loci in four Amerindian populations (state of Hidalgo, Mexico)

Population: Amerindian populations: Huastecos (n=97), Otomies de la Sierra (n=41), Otomies del Valle (n=40), and Tepehuas (n=13).     

Emergency suicide care in France: the psychiatrist's liability as seen in case law

In France, in general emergency departments, psychiatric consultations are on the increase and suicidal behavior represents a frequent reason for consultation. Psychiatrists treat patients whose behavior may be impulsive and irrational, and whose critical judgment is impaired. In emergency units, the reception and initial assessment of the patient determines his or her future pathway through the healthcare system. By its very nature, emergency medicine deals with inherently unstable situations, which may lead to the risk of medical malpractice. The aim of this article is to provide a summary of the initial management of suicidal patients by general emergency units and to comment on the medical malpractice that may expose the practitioner to risk of liability. An analysis of case history has shown that in suicide cases, malpractice due to inadequate supervision is the most frequent ruling.     

Allele frequencies of the 15 AmpF/Str Identifiler loci in the population of Metztitlán (Estado de Hidalgo), México

The 15 AmpF/STR Identifiler loci (D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818 and FGA) were analyzed in the sample of 180 unrelated autochthonous healthy adults born in Meztitlán City from the valley of Metztitlán (Estado de Hidalgo, México). The agreement with Hardy-Weinberg equilibrium was confirmed for all loci. From the forensic point of view, the heterozygosity value, power of discrimination and the a priori chance of exclusion were calculated.