Nonparametric Efficiency Analysis for Coffee Farms in Puerto Rico

Coffee production in Puerto Rico is labor intensive since harvest is done by hand for quality and topography conditions. Färe's nonparametric approach was used to estimate technical, allocative, scale and overall efficiency measures for coffee farms in Puerto Rico during the 2000 to 2004 period. On average Puerto Rico coffee farms were 46% technically efficient, 79% scale efficient, and 74% allocatively efficient.coffee production, nonparametric efficiency, Crop Production/Industries, Research Methods/ Statistical Methods,

Literature Review of COVID-19 Biochemistry

SARS-CoV-2 is the virus responsible for the current pandemic. SARS-CoV-2 is a betacoronavirus with a genome that is 79.5% identical to SARS-CoV. The virus enters T lymphocytes using its spike protein with the human angiotension-converting enzyme 2 as its receptor. SARS-CoV-2 was found to have a unique peptide sequence that could contribute to the proteolytic cleavage of the spike protein, therefore potentially impacting host range and transmissibility. COVID-19 is diagnosed through a nasal swab SARS-CoV-2 RT-PCR assay and the most common symptoms appear to be fever, cough, and fatigue. The median amount of time an individual will be contagious with the virus is 20 days. Many possible treatment methods have been explored including a SARS-CoV-2 specific antibody that could be potentially therapeutic against the virus, natural remedies, potential oligo-based therapies, and ACE inhibitors. There are also IgM-IgG tests being developed that detect the antibodies against SARS-CoV-2 virus in the blood that could help determine transmission of the virus in the population

Speaking the unspeakable in forbidden places: addressing lesbian, gay, bisexual and transgender equality in the primary school

This paper interrogates the ways in which school is produced as a particular bounded place (or collection of places) where sexuality, and particularly non-heterosexuality, is carefully policed by these boundaries. Drawing upon data generated in primary schools during a nationwide action research project (No Outsiders), we focus on three very different school places: the classroom, the staff room and a school -based afterschool art club. Our analysis engages with the contingency of place-making to show that place is neither a unitary experience nor a neutral stage upon which social relations are enacted. The three vignettes analysed offer insights into the critical potential of consciously and persistently working across (apparently) boundaried spaces within and beyond schools

Genomes of uncultured eukaryotes: sorting FACS from fiction

A recent study explores the genome content of uncultured unicellular marine eukaryotes and provides insights about interactions between uncultured eukaryotes and other biological entities

English Adverb Placement in the Vernacular: A Longitudinal Perspective

Research on English variable adverb placement is largely focused on written evidence, with only rare insights from the vernacular. Moreover, no research has investigated adverb placement in longitudinal spoken data, meaning that little is understood about more historical stages in the operation of this system or how they relate to contemporary patterns. Drawing on a large multistage corpus, we pursue the question of what more distal stages of spoken language reveal with respect to patterns of adverb placement in vernacular English. Multivariate regression reveals not only that linguistic constraints condition variation in parallel to what is reported elsewhere, but that social factors are implicated as well. We also uncover diachronic evidence that the overall frequency of pre-auxiliary adverbs decreased between the mid-nineteenth and twentieth centuries, with one notable exception. Specifically, for modal + HAVE constructions, the pre-auxiliary position has historically been a particularly favorable one, and this order has increased significantly over time. Exploration of a possible explanation leads us to suggest that the increase in pre-auxiliary adverbs in modal + HAVE constructions is linked to the decrease in pre-auxiliary adverbs elsewhere, deriving from a parallel increase of HAVE reduction in vernacular speech. The results thus suggest an interaction between apparently independent processes in the verbal syntax of English

Parental fecundability and neurodevelopmental delays and difficulties in offspring

Background: Impaired neurodevelopment is reported among children conceived by assisted reproductive technologies (ART). However, this might be explained by conditions underlying parental subfecundity, rather than the ART procedure. Methods: We examined associations of parental time-to-pregnancy (TTP) and conception by ART with neurodevelopmental traits up to 8 years of age, including motor and language skills, social delays and difficulties, and inattention-hyperactivity, among 92 142 singletons participating in the Norwegian Mother, Father and Child Cohort Study (MoBa). Mothers reported TTP and neurodevelopmental traits through questionnaires. Mean differences in standardized neurodevelopmental traits were estimated using linear regression, adjusting for maternal age, parity, educational level, body mass index and smoking, and paternal age. Results: A longer TTP was associated with decreased language skills and motor skills at 6, 18 and 36 months (P-values for trend ≤0.01), prosocial skills delay at 36 months (P-values for trend ≤0.001) and increased scores for inattention-hyperactivity traits at all ages up to 8 years (P-values for trend from 0.06 to 0.01). Effect sizes were small, ranging between 0.03 and 0.05 difference in the standardized neurodevelopmental scores. Estimates for ART were imprecise, but there were no differences between children conceived by ART and naturally conceived children of subfecund parents (TTP ≥12 months). Conclusions: Longer parental TTP is modestly but robustly associated with offspring neurodevelopmental delays and difficulties, with no added impact of ART. Future studies should investigate the underlying causes of—or aspects related to—parental subfecundity which might explain the association with offspring neurodevelopmental delays and difficulties

Genome-wide analysis of acute low salinity tolerance in the eastern oyster Crassostrea virginica and potential of genomic selection for trait improvement

As the global demand for seafood increases, research into the genetic basis of traits that can increase aquaculture production is critical. The eastern oyster (Crassostrea virginica) is an important aquaculture species along the Atlantic and Gulf Coasts of the United States, but increases in heavy rainfall events expose oysters to acute low salinity conditions, which negatively impact production. Low salinity survival is known to be a moderately heritable trait, but the genetic architecture underlying this trait is still poorly understood. In this study, we used ddRAD sequencing to generate genome-wide single-nucleotide polymorphism (SNP) data for four F2 families to investigate the genomic regions associated with survival in extreme low salinity (\u3c3). SNP data were also used to assess the feasibility of genomic selection (GS) for improving this trait. Quantitative trait locus (QTL) mapping and combined linkage disequilibrium analysis revealed significant QTL on eastern oyster chromosomes 1 and 7 underlying both survival and day to death in a 36-day experimental challenge. Significant QTL were located in genes related to DNA/RNA function and repair, ion binding and membrane transport, and general response to stress. GS was investigated using Bayesian linear regression models and prediction accuracies ranged from 0.48 to 0.57. Genomic prediction accuracies were largest using the BayesB prior and prediction accuracies did not substantially decrease when SNPs located within the QTL region on Chr1 were removed, suggesting that this trait is controlled by many genes of small effect. Our results suggest that GS will likely be a viable option for improvement of survival in extreme low salinity

Limited historical admixture between European wildcats and domestic cats

Domestic cats were derived from the Near Eastern wildcat (Felis lybica), after which they dispersed with people into Europe. As they did so, it is possible that they interbred with the indigenous population of European wildcats (Felis silvestris). Gene flow between incoming domestic animals and closely related indigenous wild species has been previously demonstrated in other taxa, including pigs, sheep, goats, bees, chickens, and cattle. In the case of cats, a lack of nuclear, genome-wide data, particularly from Near Eastern wildcats, has made it difficult to either detect or quantify this possibility. To address these issues, we generated 75 ancient mitochondrial genomes, 14 ancient nuclear genomes, and 31 modern nuclear genomes from European and Near Eastern wildcats. Our results demonstrate that despite cohabitating for at least 2,000 years on the European mainland and in Britain, most modern domestic cats possessed less than 10% of their ancestry from European wildcats, and ancient European wildcats possessed little to no ancestry from domestic cats. The antiquity and strength of this reproductive isolation between introduced domestic cats and local wildcats was likely the result of behavioral and ecological differences. Intriguingly, this long-lasting reproductive isolation is currently being eroded in parts of the species’ distribution as a result of anthropogenic activities

Meeting Design Characteristics and Attendee Perceptions of Staff/Team Meeting Quality

Meetings are a common tool in organizations and are used for a variety of purposes and implemented in a variety of ways. Despite the prevalence of meetings, surveys suggest that they are often unproductive and costly. The current study focused on how meetings are designed in hopes of providing practically and theoretically meaningful recommendations for improving meeting quality. A total of 18 design characteristics associated with staff/team meetings were identified and their relevance to perceptions of meeting quality was tested. Using an online panel-based respondent pool of working adults, 367 individuals participated in a survey that they completed within 48 hr of their most recent staff/team meeting. The results demonstrated that 9 of the design characteristics, spanning all 4 categories of design characteristics (i.e., temporal, physical, procedural, and attendee), significantly predicted perceptions of meeting quality. Furthermore, this study validated and greatly extended previous research showing that agenda use, meeting punctuality, facility quality, and meeting facilitator status relate to meeting quality. In addition, this study identified specific relationships to meeting quality for several facility quality characteristics, including lighting, meeting space, refreshments, and temperature, and expanded our knowledge of key characteristics by identifying agreement use and the number of attendees as important. Taken together, these findings suggest that effective meeting design warrants holistic attention to all meeting aspects. These results were robust across demographics, including organizational type, gender, and supervisory status. Implications for meeting design are discussed