In this study, an improved lead—radium dating technique provided independent age estimates from sagittal otoliths. This technique used the known properties of radioactivity for lead and radium to determine the validity of fish age estimates. An improvement to lead—radium dating using mass spectrometry allowed the use of smaller samples than previously possible; therefore, an application was made to otolith cores, the first few years of otolith growth. This approach circumvented the use of whole otoliths and alleviated many of the assumptions that were necessary in previous lead—radium dating applications. Hence, it was possible to critically evaluate lead—radium dating as a tool in fish age validation. The measurement of lead—radium ratios for a series of age groups that consisted of otolith cores, grouped based on growth-zone counts from thin sections, showed a high degree of correlation to the expected lead—radium ingrowth curve. This finding provided support for age estimation procedures using thin otolith sectioning. Stephen G. Wischniowski , Craig R.
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Both women and men value physical attributes, such as age and weight, and reveal that their dating choices are assortative along several traits. Importantly.
Quartz is the datable component in mortar. Although its luminescence properties are very well studied, the problem of mortar dating arises from a low level of optical bleaching. In order to reduce the time consuming efforts for dating lime mortar in monuments by optically stimulated luminescence, we investigated the most suitable methods of dose and dose rate determination, and we explored tests which are suitable to predict the datability of a given material.
Reverting to the large number of publications on sedimentary partially bleached quartz we found linear modulation techniques especially useful, equally we also recommend the determination of the level of optical depletion before starting analyses. Single grain analysis is regarded as an ultimate but infallible tool to date very poorly bleached quartz from mortar. Dose rate measurements need to take into account the radioactive equilibrium of the uranium decay and the short range inhomogeneity of the environmental gamma radiation field: gamma spectrometry and on-site TLD measurements are best suited.
Montuori 1 , P. Di Matteo 2 , M. Lehnert 2 , F.
With the explosive growth of genomic sequence data, molecular clock-dating techniques are increasingly being used to date divergence events.
The TS Turin Shroud is a linen cloth which enveloped the dead body of a tortured and crucified man that is believed by many to be the burial cloth of Jesus Christ. The linen fabric has been radiocarbon dated in to the Middle Age but a recent robust statistical analysis shows that the resulting age appears flawed by a systematic effect. The present paper discusses the results obtained using innovative dating methods based on the analysis of mechanical parameters breaking strength, Young modulus and loss factor and of opto-chemical ones FT-IR and Raman.
To obtain mechanical results it was necessary to build a particular cycling-loads machine able to measure the mechanical parameters of single flax fibers mm long. While this date is both compatible with the time in which Jesus Christ lived in Palestine and with very recent results based on numismatic dating, it is not compatible with the radiocarbon measurements that should be repeated after the necessary clarifications relative to the possible environmental factors that could have biased the results.
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Canadian Journal of Fisheries and Aquatic Sciences
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Armstrong, L. Potential determinants of heavier internet usage. International Journal of Human-Computer Studies, 53, Arnett, J. Emerging adulthood: A theory of development from the late teens through the twenties. American Psychologist, 55 5 , The developmental context of substance use in emerging adulthood. Journal of Drug Issues, 35 2 , Bahrainian, A. Internet addiction among stu-dents: The relation of self-esteem and depression. Bulletin of Envi-ronment, Pharmacology and Life Sciences, 3 3 , Valencia: Socidrogal-cohol.
Beranuy, M. Psicothema, 21 3 ,
Age Dating of Middle-Distillate Fuels Released to the Subsurface Environment
Dating applications apps on smartphones have become increasingly popular. The aim of this study was to explore the association between the use of dating apps and risky sexual behaviours. Data were collected in four university campuses in Hong Kong.
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Dating Preferences and Meeting Opportunities in Mate Choice Decisions
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The practice of molecular dating is an essential tool for hypothesis testing in evolutionary biology. Vagaries of fossilization and taphonomic bias.
In the last years the mortar dating through Optically Stimulated Luminescence OSL techniques has become a viable support for chronological estimations date of construction or restoration episodes of historical buildings. However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose.
This paper discusses the results obtained by OSL dating blue diode stimulation on the polymineral fine grain phase, enriched in quartz, extracted from lime mortar samples collected from different sites. Thermal transfer effects, through the behaviour of Equivalent Dose ED and recovery tests, degree and time of bleaching were studied. For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence TL dating on the bricks.
The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions.
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We describe an improved method for dating buried paleosols using measurements of the cosmic-ray-produced radionuclides 10 Be and 26 Al in quartz grains, and apply it to a sequence of intercalated tills and paleosols in central Missouri, USA, that record Plio-Pleistocene advances of the Laurentide Ice Sheet. A buried paleosol implies a period of surface exposure and nuclide accumulation, followed by burial and a halt to nuclide production.
If the paleosol is formed in a sedimentary unit such as till, this unit may also have been emplaced with unknown 26 Al and 10 Be concentrations inherited from past surface exposure. If the inherited nuclide concentrations are the same at all depths in the soil—as is true for well-mixed sediments such as till—then the 26 Al and 10 Be concentrations at different depths in the paleosol will show a linear relationship.
The slope of this line depends on the duration of burial of the paleosol, but not on the inherited nuclide concentrations or on the sample depths. Thus, one can date strata overlying buried paleosols by measuring 26 Al and 10 Be at multiple depths in the paleosol and calculating the burial age of the paleosol from the resulting isochron.
Bayesian Node Dating based on Probabilities of Fossil Sampling Supports Trans-Atlantic Dispersal of Cichlid Fishes. Michael Matschiner.
Directionality of physical and psychological dating violence among adolescents in Recife, Brazil. The aim was to investigate the physical and psychological dating violence among adolescents with respect to the profiles of directionality – only man perpetrates, only woman perpetrates, and bidirectional, ie, both perpetrate violence. Sample was performed by two-stage cluster selection in public and private school in the city of Recife PE , Brazil, presenting data on adolescents of both sexes between 15 and 19 years old.
Statistical analyzes incorporated the sampling weight and the complex sample design. Violence is bidirectional in most forms studied It was concluded that adolescent dating violence shows a pattern where partners attack each other, both physically and psychologically. Future research should study the patterns of these acts of violence, keeping the adolescent couple as the unit of analysis and exploring the context in which such violence occurs.
In Brazil, violence in interpersonal relationships have usually been sistematically banalized in the routine of citizens, by the way it is publicized in some means of communication and because of the way it is handled by social institutions. National studies that investigate violence in the young population group have focused on its most severe form: homicides that occur mostly among Brazilian adolescents and young adults 1. Among the types of violence involving adolescents, interpersonal violence, which occurs in intimate relationships dating , called dating violence, has been analyzed by researchers from several countries 2 – 5.
NOTUNG: A Program for Dating Gene Duplications and Optimizing Gene Family Trees
If the address matches an existing account you will receive an email with instructions to reset your password. If the address matches an existing account you will receive an email with instructions to retrieve your username. Large scale gene duplication is a major force driving the evolution of genetic functional innovation. Whole genome duplications are widely believed to have played an important role in the evolution of the maize, yeast, and vertebrate genomes.
The use of evolutionary trees to analyze the history of gene duplication and estimate duplication times provides a powerful tool for studying this process. Many studies in the molecular evolution literature have used this approach on small data sets, using analyses performed by hand.
Ways of Masculinity in Online Dating Profiles: the Cases of and Full Text: PDF. DOI: .
Research among adults has shown that younger age is a consistent risk factor for experiencing and perpetrating intimate partner violence. However, no representative epidemiologic studies of lifetime prevalence of dating violence among adolescents have been conducted. After controlling for the effects of potentially confounding demographics and risk behaviors, data from both surveys indicate that physical and sexual dating violence against adolescent girls is associated with increased risk of substance use eg, cocaine use for , odds ratio [OR], 4.
Intimate partner violence IPV against women is a major public health concern. Estimates from a recent large-scale, nationally representative survey 1 indicate that more than 1. Research among adults has shown that younger age is a consistent risk factor for experiencing and perpetrating IPV. Most IPV is directed at women. The rate of violence against females by intimate partners is 3 to 6 times that of IPV against males.
For these reasons, research and prevention efforts are appropriately focused on violence against female partners. Recent events involving fatal violence perpetrated by adolescents have focused additional attention on all forms of youth violence, 11 and there are increasing calls for epidemiologic study of IPV against adolescent girls, 12 in particular. A broad range of physical and mental health concerns have been shown to be associated with IPV among women, 13 and similar morbidity risks are considered likely for adolescents.