The interaction of local populations has been the focus of an increasing number of studies in the past 30 years. The study of source-sink dynamics has especially generated much interest. Many of the criteria used to distinguish sources and sinks incorporate the process of apparent survival (i.e., the combined probability of true survival and site fidelity) but not emigration. These criteria implicitly treat emigration as mortality, thus biasing the classification of sources and sinks in a manner that could lead to flawed habitat management. Some of the same criteria require rather restrictive assumptions about population equilibrium that, when violated, can also generate misleading inference. Here, we expand on a criterion (denoted "contribution" or Cr) that incorporates successful emigration in differentiating sources and sinks and that makes no restrictive assumptions about dispersal or equilibrium processes in populations of interest. The metric Cr is rooted in the theory of matrix population models, yet it also contains clearly specified parameters that have been estimated in previous empirical research. We suggest that estimates of emigration are important for delineating sources and sinks and, more generally, for evaluating how local populations interact to generate overall system dynamics. This suggestion has direct implications for issues such as species conservation and habitat management.

Black mothers provide a disproportionate share of unpaid and informal health care support to others, internal and external to their households. In addition, black women experience a disproportionate burden of chronic disease and healthrelated risk factors. Despite these trends, few studies have examined the impact of daily mothering on women’s self-care practices. Embodiment, an ecosocial theory applied to health disparities research, describes a process by which individuals may biologically incorporate their material and social environments. Black women and mothers have historically managed their own well-being in the context of the care of others, as well as popular images and perceptions that characterize this population as stronger, less feminine, and deviant relative to white women. In this study, we examine how black mothers understand and report their self-care as they simultaneously manage obligations to others and popular messages about black women and motherhood. Findings were based on qualitative data collected from 16 black women. Overall, we found the women reported feelings of stress. This stress seemed to be a consequence of conflicting demands of (1) maternal sacrifice, which is a component of the expectations of a "strong black woman" stereotype, and (2) self-care as it is defined and promoted by healthism.

Nicarbazin, a drug used to control the protozoal disease coccidiosis in poultry, is a complex of the highly insoluble drug 4,4'-dinitrocarbanilide with 2-hydroxy-4,6-dimethylpyrimidine. The structures of this and other 4,4'-dinitrocarbanilide complexes have not been determined, but an analogous 2:1 complex of 4,4'-dinitrodiphenylamine with 1,4-diacetylpiperazine has been prepared in which the only possible bonds are hydrogen bonds between the amide carbonyls and amino hydrogens. Scanning electron microscopy revealed that micron-size crystals of nicarbazin disintegrate in water to form much smaller dinitrocarbanilide crystals. Similar complex dissolution in the gut of poultry may account for the greater effectiveness of dinitrocarbanilide when administered as complexed rather than uncomplexed drug. Particle size problems associated with other highly insoluble drugs and pesticides may be resolved by the use of nicarbazin-like complexes.

Background: Treatment for epistaxis includes application of intranasal vasoconstrictors. These medications have a precaution against use in patients with hypertension. Given that many patients who present with epistaxis are hypertensive, these warnings are commonly overridden by clinical necessity. Objectives: To determine the effects of these medications on blood pressure. Methods: We conducted a single-center, randomized, double-blind, placebo-controlled trial from November 2014 through July 2016. Adult patients being discharged from the emergency department (ED) at Mayo Clinic (Rochester, Minnesota) were recruited. Patients were ineligible if they had a contraindication to study medications, had a history of hypertension, were currently taking antihypertensive or antiarrhythmic medications, or had nasal abnormalities such as epistaxis. Subjects were randomized to 1 of 4 study arms (phenylephrine 0.25%; oxymetazoline 0.05%; lidocaine 1% with epinephrine 1:100,000; or bacteriostatic 0.9% sodium chloride [saline]). Blood pressure and heart rate were measured every 5 minutes for 30 minutes. Results: Sixty-eight patients were enrolled in the study; of these, 63 patients completed the study (oxymetazoline, n=15; phenylephrine, n=20; lidocaine with epinephrine, n=11; saline, n=17). We did not observe any significant differences in mean arterial pressure over time between phenylephrine and saline, oxymetazoline and saline, or lidocaine with epinephrine and saline. The mean greatest increases from baseline in mean arterial pressure, systolic and diastolic blood pressure, and heart rate for each treatment group also were not significantly different from the saline group. Conclusion: Intranasal vasoconstrictors did not significantly increase blood pressure in patients without a history of hypertension. Our findings reinforce the practice of administering these medications to patients who present to the ED with epistaxis, regardless of high blood pressure.

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