Search

BackgroundThe history of maize has been characterized by major demographic events, including population size changes associated with domestication and range expansion, and gene flow with wild relatives. The interplay between demographic history and selection has shaped diversity across maize populations and genomes.ResultsWe investigate these processes using high-depth resequencing data from 31 maize landraces spanning the pre-Columbian distribution of maize, and four wild teosinte individuals (Zea mays ssp. parviglumis). Genome-wide demographic analyses reveal that maize experienced pronounced declines in effective population size due to both a protracted domestication bottleneck and serial founder effects during post-domestication spread, while parviglumis in the Balsas River Valley experienced population growth. The domestication bottleneck and subsequent spread led to an increase in deleterious alleles in the domesticate compared to the wild progenitor. This cost is particularly pronounced in Andean maize, which has experienced a more dramatic founder event compared to other maize populations. Additionally, we detect introgression from the wild teosinte Zea mays ssp. mexicana into maize in the highlands of Mexico, Guatemala, and the southwestern USA, which reduces the prevalence of deleterious alleles likely due to the higher long-term effective population size of teosinte.ConclusionsThese findings underscore the strong interaction between historical demography and the efficiency of selection and illustrate how domesticated species are particularly useful for understanding these processes. The landscape of deleterious alleles and therefore evolutionary potential is clearly influenced by recent demography, a factor that could bear importantly on many species that have experienced recent demographic shifts.

ObjectiveTo compare the performance characteristics of cell-bound complement (C4d) activation products (CBCAPS) on erythrocyte (EC4d) and B cells (BC4d) with antibodies to double-stranded DNA (anti-dsDNA) and complement C3 and C4 in systemic lupus erythematosus (SLE).MethodsThe study enrolled 794 subjects consisting of 304 SLE and a control group consisting of 285 patients with other rheumatic diseases and 205 normal individuals. Anti-dsDNA and other autoantibodies were measured using solid-phase immunoassays while EC4d and BC4d were determined using flow cytometry. Complement proteins were determined using immunoturbidimetry. Disease activity in SLE was determined using a non-serological Systemic Lupus Erythematosus Disease Activity Index SELENA Modification. A two-tiered methodology combining CBCAPS with autoantibodies to cellular and citrullinated antigens was also developed. Statistical analyses used area under receiver operating characteristic curves and calculations of area under the curve (AUC), sensitivity and specificity.ResultsAUC for EC4d (0.82±0.02) and BC4d (0.84±0.02) was higher than those yielded by C3 (0.73±0.02) and C4 (0.72±0.02) (p

Objective: Maternal obesity affects 39.7% of reproductive‐age women in the United States. Emerging research has suggested that in utero exposure to maternal obesity is associated with adverse neurodevelopmental outcomes, but knowledge of underlying mechanisms in human samples is lacking. Methods: A matched case–control study was performed in women with singleton fetuses who were undergoing elective pregnancy termination at gestational ages 15 to 21 weeks. Maternal adiponectin levels from plasma were measured using ELISA kits. RNA was extracted from fetal brain tissue using RNeasy Mini Kit (QIAGEN). mRNA expression from ADIPOR1, ADIPOR2, MTOR, ATG5, ATG7, BECN1, and MAP1LC3B was quantified through the ΔΔCt method and using GAPDH as a housekeeping gene. Results: We have identified transcription patterns associated with inhibition of autophagy in male fetal brain tissue exposed to maternal obesity (↑MTOR, ↓ATG5, ↓ATG7, and ↓MAP1LC3B), with female fetuses demonstrating either no change in transcription or nonsignificant changes associated with increased autophagy. There was significant downregulation of the autophagy‐associated gene BECN1 in both male and female individuals who were exposed to obesity in utero. Conclusions: We present novel evidence suggesting that in utero exposure to maternal obesity in humans may significantly affect neurodevelopment, especially in male fetuses, through alterations in normal autophagy molecular mechanisms and with adiponectin as a potential mediator. [ABSTRACT FROM AUTHOR]

Objective In an effort to reduce the primary cesarean delivery (CD) rate, the American College of Obstetricians and Gynecologists (ACOG) recommended new labor guidelines in 2014 that allow longer duration of labor times. There are little data on the impact of these guidelines on CD rates and pregnancy outcomes in a predominantly Hispanic population. This study aimed to compare the primary CD rates and maternal and neonatal outcomes in patients undergoing primary CD for arrest of labor before and after implementation of the 2014 guidelines. Study Design This was a retrospective cohort study of term patients who underwent a CD for an arrest disorder between January 2011 and April 2017 at a county teaching hospital. Our primary outcome was the composite maternal and neonatal morbidities (CMM and CNM, respectively). Differences in the demographic and clinical characteristics, CMM, and CNM stratified by time period (pre- vs. postimplementation) were examined. Results There were 4,976 deliveries in the study period: 525 (11%) underwent primary CD for arrest disorder; 298 (6%) prior to 2014, and 227 (5%) after 2014 (p = 0.62). There was no significant difference in the rate of CD between the two periods (13.4 vs. 13.3%, p = 0.81). In patients undergoing CD for arrest of dilation (n = 389), the CMM and CNM did not significantly change between both groups (63.3 vs. 56%, p = 0.15). In patients who had a CD for arrest of descent (n = 136), the rate of CMM significantly increased from 50 to 75% (p = 0.02) with no significant change in the CNM (13.2 vs. 20%, p = 0.3). Conclusion Despite significant changes in labor management after the publication of the 2014 guidelines, our primary CD rate was not reduced, and we noticed an increase in CMM in patients who had CD for arrest of descent. A randomized controlled trial is needed to further evaluate the effect of these guidelines nationally. Key Points The Obstetric Care Consensus statement aims to decrease the rate of cesarean delivery (CD). We observed an increase in morbidity in CD if done for arrest of descent (pre/post the consensus). A randomized controlled trial is needed to further assess the impact of the guidelines on morbidity. [ABSTRACT FROM AUTHOR]

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.anbehav.2007.02.034 Byline: Claudia Valderrabano-Ibarra, Ireri Brumon, Hugh Drummond Abstract: Theoreticians propose that trained winning and losing are important processes in creating linear animal dominance hierarchies, and experiments have shown that both processes can occur in animals, but their actual roles in creating natural hierarchies are unknown. We described agonism in 18 broods of three blue-footed boobies, Sula nebouxii, a species for which trained winning and losing have been demonstrated, to infer how these processes generate and maintain a natural hierarchy. Ranks in the linear hierarchy that emerged in every brood were initially assigned by asymmetries in age, size and maturity, which led to differences between broodmates in levels of expressed and received aggression and, consequently, to differences in the training of their aggressiveness and submissiveness. Later, ranks appeared to be maintained by the chicks' acquired aggressive and submissive tendencies combined with ongoing effects of persisting differences in size and maturity. Our results suggest that trained winning and trained losing are important in the construction of booby hierarchies but that these two axes of learning are largely independent. Increase in submissiveness occurs over a period of about 10-20 days, and the level of submissiveness reached varies with the amount of aggression received. After training, submissiveness is apparently maintained by a lower level of aggression and increasing use of threats. Threats become increasingly effective as chicks age, but are never as effective as attacks. Author Affiliation: Instituto de Ecologia, Universidad Nacional Autonoma de Mexico, Mexico Article History: Received 5 June 2006; Revised 9 August 2006; Accepted 14 February 2007 Article Note: (miscellaneous) MS. number: A10466R2

Introduction: Interprofessional education (IPE) activities involving pharmacy (PharmD) and family nurse practitioner (FNP) students is understudied. Interactions between PharmD and FNP students have become important since most recent Accreditation Council for Pharmacy Education standards included a requirement for schools of pharmacy to have IPE. The primary objective of this study is to evaluate the perceptions and attitudes among PharmD and FNP students towards an IPE activity. Methods: Atleast 1 student from each discipline was assigned to one team and participated in simulated ambulatory care scenarios. A survey was completed by students after the activity, which mapped each survey statement to an Interprofessional Education Collaborative (IPEC) core competency. Results: Perceptions and attitudes between PharmD and FNP students were similar, with no significant differences except with 2 statements, one survey statement in the Teams and Teamwork core competency and another in the Roles/Responsibilities core competency. A less favorable response with more than half of FNP students reporting "strongly agree" (18%) and "agree" (35%) resulted for the statement regarding their professional roles in the IPE activity. Conclusion: PharmD and FNP students reported favorable perceptions and attitudes in each IPEC core competency after participation in the IPE activity. There may be a need to review the discipline's professional role before participating in the activity. [ABSTRACT FROM AUTHOR]

Introduction: The postoperative sore throat is a frequent complication, characterized by odynophagia after endotracheal intubation. Objective: To compare nebulized ketamine in the preoperative period against nebulized placebo for the reduction of the postoperative sore throat on elective surgery under general anesthesia. Material and methods: We performed an experimental, prospective, randomized, double blind study; conducted from February to July 2016. Patients were randomly assigned into two groups: group K: preoperative nebulized ketamine (50 mg: 1 mL of ketamine + 2 mL of saline solution 0.9%) against group P: placebo (nebulization of 3 mL saline solution 0.9%). We collected vital signs as well as symptoms and intensity of postoperative sore throat according to the analog numeric scale at the first and forth postoperative hours Results: The use of nebulized ketamine does not represent a statistically significant difference compared to placebo for postoperative sore throat. The incidence of postoperative sore throat in our study was of 59.29%. Conclusions: We need further studies of nebulized ketamine in the Mexican population, as well as a larger study to determine the gold standard for the treatment of POST. [ABSTRACT FROM AUTHOR]