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Objectives: Social change and the aging process are racially bifurcated in the United States, where Black and White populations have long lived in divergent social worlds. This study examines the cohort patterns and life-course trajectories of Black and White homicide involvement over the past four decades. Data and Methods: The study uses data from the Supplemental Homicide Reports and Age-Period-Cohort-Interaction (APC-I) models to analyze race-specific trends of (alleged) homicide offending and victimization between 1976 and 2018 in the U.S. Results: Results reveal similar patterns in the age, period, and cohort effects on Black and White homicide involvement. However, while the shapes of these trajectories are comparable, the volatility in cohort effects on homicide is much more accentuated for Black cohorts than White cohorts. We also find racial differences for cohorts born after 1990, with a downward cohort pattern among the White group but a flat cohort trend among the Black group. Conclusions: Findings suggest that Black cohorts' homicide involvement is more susceptible than White cohorts' to the influence of external social changes (e.g., economic downturn, the crack epidemic). In addition, an increasing racial gap between Black and White populations is found among the recent birth cohorts. Possible mechanisms are discussed. [ABSTRACT FROM AUTHOR]

Nuclides pollution and its biological effects are of great concern, especially for bryophytes during their terrestrial adaptation. Understanding PSII activity and electron transport response is vital for comprehending moss abiotic stress reactions. However, little is known about the photosynthetic performance of moss under nuclide treatment. Therefore, this study aimed to evaluate the chlorophyll fluorescence of Racomitrium japonicum L. The moss was subjected to Sr2+ solutions at concentrations of 5, 50, and 500 mg/L to evaluate chlorophyll a fluorescence using the OJIP test. Moderate and high Sr2+ stress led to inner cell membrane dissolution and reduced chlorophyll content, indicating impaired light energy absorption. At 5 mg/L Sr2+, fluorescence kinetics showed increased light energy capture, energy dissipation, and total photosynthetic driving force, thus stimulating transient photosynthetic activity of PSII and improving PSI reduction. Linear electron transfer and PSII stability significantly decreased under moderate and high Sr2+ stress, indicating potential photosynthetic center damage. Cyclic electron transfer (CEF) alleviated photosynthetic stress at 5 mg/L Sr2+. Thus, low Sr2+ levels stimulated CEF, adjusting energy flux and partitioning to protect the photosynthetic apparatus. Nevertheless, significant damage occurred due to inefficient protection under high Sr2+ stress. [ABSTRACT FROM AUTHOR]

This study examines the longitudinal change in the sex gap of homicide victimization in 76 countries between 1975 and 2017. We compiled a cross-national dataset with homicide victimization data from WHO and structural measures from multiple databases. Our findings reveal that countries with low homicide rates and rapid homicide decline are more likely to have narrowing sex gaps, and that the narrowing gaps are mainly driven by male homicide decline. Different from the prior literature, we find null associations between most measures of gender stratification and the sex gap. Instead, results reveal that aging population is associated with a narrowing sex gap. Implications are discussed, including the specific effects of the study period and the shifting dynamics of homicide trends. [ABSTRACT FROM AUTHOR]

The current study examines the gendered reaction to victimization threats from 1973 to 2016 using the General Social Survey and the hierarchical age-period-cohort-characteristics model. Results suggest the gender gap is narrowing across time with a gradual decline among women who report feeling afraid to walk alone at night. The period-level change in violent crime rates and the cohort differences in gender ideology have significant impact on the gender-specific reaction to the threats of victimization. The macro-level variables explain some variance in the gender gap across time. [ABSTRACT FROM AUTHOR]

Abstract Background Long-distance ocean voyages may have substantial impacts on seamen's health, possibly causing malnutrition and other illness. Measures can possibly be taken to prevent such problems from happening through preparing special diet and making special precautions prior or during the sailing if a detailed understanding can be gained about what specific health effects such voyages may have on the seamen. Methods We present a computational study on 200 seamen using 41 chemistry indicators measured on their blood samples collected before and after the sailing. Our computational study is done using a data classification approach with a support vector machine-based classifier in conjunction with feature selections using a recursive feature elimination procedure. Results Our analysis results suggest that among the 41 blood chemistry measures, nine are most likely to be affected during the sailing, which provide important clues about the specific effects of ocean voyage on seamen's health. Conclusions The identification of the nine blood chemistry measures provides important clues about the effects of long-distance voyage on seamen's health. These findings will prove to be useful to guide in improving the living and working environment, as well as food preparation on ships.

A robust literature has investigated homicide trends in the United States since 1950. The prevalence of homicide in the country almost doubled in the 1960s, remained high until the 1990s and then declined precipitously. Surprisingly, Canada displayed the same trend. We decompose the age, period and cohort effects on the homicide trends of the United States and Canada since 1950, exploring shared effects in light of these countries' historical and policy differences over the past seven decades. Our study reveals remarkably similar trends and effects in Canada as those previously documented for the United States, despite diverging approaches to criminal justice and to the use of incarceration since the 1950s. We explore these findings and expand on their implications. [ABSTRACT FROM AUTHOR]

Do traditional theories of conflict influence juvenile court decision-making and explain racial/ethnic disparities? Racial/ethnic threat, symbolic threat, and structural inequality perspectives purport social controls increase when groups differ in race, ethnicity, or class. Scholarship tends to test one perspective at a time and use county as a unit of analysis. Taking a comparative approach, this study evaluates whether contextual indicators of these three theories, measured at the county- and zip code-levels, contribute to Black-White and Latino-White disparities in court decisions. Multilevel models reveal weak and partial support for each perspective. More effects appear at the zip code-level, indicating conflict may occur within rather than across courts. Macro-level theories must then be reconsidered to describe modern-day juvenile court proceedings. [ABSTRACT FROM AUTHOR]

The public salience of crime has wide‐ranging political and social implications; it influences public trust in the government and citizens' everyday routines and interactions, and it may affect policy responsiveness to punitive attitudes. Identifying the sources of crime salience is thus important. Two competing theoretical models exist: the objectivist model and the social constructionist model. According to the first, crime salience is a function of the crime rate. According to the second, crime salience is a function of media coverage and political rhetoric, and trends in crime salience differ across population subgroups as a result of differences in their responsiveness to elite initiatives. In both theories, period‐level effects predominate. Variation in crime salience, however, may also reflect age and cohort effects. Using data from 422,504 respondents interviewed between 1960 and 2014, we first examine the nature of crime salience using hierarchical age–period–cohort (HAPC) models and then analyze period‐level predictors using first differences. We find that 1) crime salience varies mostly at the period level; 2) crime salience trends are parallel (cointegrated) across demographic, socioeconomic, and partisan groups; and 3) crime salience trends within every population subgroup are most consistent with the constructionist model. The crime rate does not exert a significant effect in any subgroup. [ABSTRACT FROM AUTHOR]

The public salience of crime has wide‐ranging political and social implications; it influences public trust in the government and citizens' everyday routines and interactions, and it may affect policy responsiveness to punitive attitudes. Identifying the sources of crime salience is thus important. Two competing theoretical models exist: the objectivist model and the social constructionist model. According to the first, crime salience is a function of the crime rate. According to the second, crime salience is a function of media coverage and political rhetoric, and trends in crime salience differ across population subgroups as a result of differences in their responsiveness to elite initiatives. In both theories, period‐level effects predominate. Variation in crime salience, however, may also reflect age and cohort effects. Using data from 422,504 respondents interviewed between 1960 and 2014, we first examine the nature of crime salience using hierarchical age–period–cohort (HAPC) models and then analyze period‐level predictors using first differences. We find that 1) crime salience varies mostly at the period level; 2) crime salience trends are parallel (cointegrated) across demographic, socioeconomic, and partisan groups; and 3) crime salience trends within every population subgroup are most consistent with the constructionist model. The crime rate does not exert a significant effect in any subgroup. [ABSTRACT FROM AUTHOR]

By using US and Western databases, Hirschi and Gottfredson (HG) projected that the age distribution of crime always and everywhere has (a) a spiked adolescent peak and (b) a continuous decline thereafter into old age. In the study described here, we investigated these two core postulates of the age-crime invariance thesis by comparing age-crime distributions in South Korea (SK) with the inverted J-shaped norm proposed by HG. Our analysis considered age-crime schedules for a number of offense types (e.g. homicide) and indexes (e.g. total, violent, and property) and across a variety of measures or statistical tests. The findings revealed considerable divergence in South Korea's age-crime patterns compared with the HG invariance norm. Instead, SK age-crime patterns parallel those for Taiwan (also a collectivist Asian country) as reported recently by Steffensmeier and colleagues (2017). Implications for research and theory on the age-crime relation more broadly are discussed. [ABSTRACT FROM AUTHOR]

In this study, we used age–crime statistics from India to investigate the two core tenets of Hirschi and Gottfredson's (HG) invariance thesis that the age distribution of crime is always and everywhere adolescent spiked and thereafter declines continuously into elder ages. Besides comparisons to the inverted J-shaped distribution projected by HG, we further compared Indian age–crime patterns with those in United States (Western nation; main evidential source for HG invariance projection) and Taiwan (like India, a non-Western collectivist society). Findings suggest considerable divergence in India's age–crime patterns compared with HG invariance norm and US age–crime distributions, but overall similarity with Taiwan's age–crime schedules. Implications for research and theory on the age–crime relation more broadly are discussed. [ABSTRACT FROM AUTHOR]