Quantitative LSPR Imaging for Biosensing with Single Nanostructure Resolution

AbstractLocalized surface plasmon resonance (LSPR) imaging has the potential to map complex spatio-temporal variations in analyte concentration, such as those produced by protein secretions from live cells. A fundamental roadblock to the realization of such applications is the challenge of calibrating a nanoscale sensor for quantitative analysis. Here, we introduce a new, to our knowledge, LSPR imaging and analysis technique that enables the calibration of hundreds of individual gold nanostructures in parallel. The calibration allowed us to map the fractional occupancy of surface-bound receptors at individual nanostructures with nanomolar sensitivity and a temporal resolution of 225 ms. As a demonstration of the technique’s applicability to molecular and cell biology, the calibrated array was used for the quantitative LSPR imaging of anti-c-myc antibodies harvested from a cultured 9E10 hybridoma cell line without the need for further purification or processing

Predators, environment and host characteristics influence the probability of infection by an invasive castrating parasite

Not all hosts, communities or environments are equally hospitable for parasites. Direct and indirect interactions between parasites and their predators, competitors and the environment can influence variability in host exposure, susceptibility and subsequent infection, and these influences may vary across spatial scales. To determine the relative influences of abiotic, biotic and host characteristics on probability of infection across both local and estuary scales, we surveyed the oyster reef-dwelling mud crab Eurypanopeus depressus and its parasite Loxothylacus panopaei, an invasive castrating rhizocephalan, in a hierarchical design across >900 km of the southeastern USA. We quantified the density of hosts, predators of the parasite and host, the host's oyster reef habitat, and environmental variables that might affect the parasite either directly or indirectly on oyster reefs within 10 estuaries throughout this biogeographic range. Our analyses revealed that both between and within estuary-scale variation and host characteristics influenced L. panopaei prevalence. Several additional biotic and abiotic factors were positive predictors of infection, including predator abundance and the depth of water inundation over reefs at high tide. We demonstrate that in addition to host characteristics, biotic and abiotic community-level variables both serve as large-scale indicators of parasite dynamics

Let's talk about sex – what do older men and women say about their sexual relations and sexual activities? A qualitative analysis of ELSA Wave 6 data

In 2012/2013 the English Longitudinal Study of Ageing (ELSA) included a comprehensive Sexual Relationships and Activities questionnaire (SRA-Q). A total of 7,079 men and women aged 50 to >90, primarily heterosexual and in a coupled relationship, completed the SRA-Q answering a series of questions about their attitudes to sexual relationships, their own sexual activities, problems and concerns with sexual functioning, and quality of intimate relationships. The questions aimed to gain insights into the ways in which sexual relations and activities related to health, well-being and other lifestyle factors as people grow older. The primary mode of data collection was a tick box response to a series of questions. However, at the end of the questionnaire an open comment box was provided, which asked respondents whether there was anything else that they would like to say. 1,084 respondents provided additional information and these comments created a unique qualitative dataset. The analysis of this data then illustrated how people’s health, relationships, experiences and perceptions of ageing, along with sexual satisfaction, impact on sexual relationships and activities

Development and characterization of microsatellite loci for the haploid–diploid red seaweed Gracilaria vermiculophylla

Microsatellite loci are popular molecular markers due to their resolution in distinguishing individual genotypes. However, they have rarely been used to explore the population dynamics in species with biphasic life cycles in which both haploid and diploid stages develop into independent, functional organisms. We developed microsatellite loci for the haploid–diploid red seaweed Gracilaria vermiculophylla, a widespread non-native species in coastal estuaries of the Northern hemisphere. Forty-two loci were screened for amplification and polymorphism. Nine of these loci were polymorphic across four populations of the extant range with two to eleven alleles observed. Mean observed and expected heterozygosities ranged from 0.265 to 0.527 and 0.317 to 0.387, respectively. Overall, these markers will aid in the study of the invasive history of this seaweed and further studies on the population dynamics of this important haploid–diploid primary producer

Food, Nutrition, Physical Activity, and the Prevention of Cancer: a Global Perspective

This Report has a number of inter-related general purposes. One is to explore the extent to which food, nutrition, physical activity, and body composition modify the risk of cancer, and to specify which factors are most important. To the extent that environmental factors such as food, nutrition, and physical activity influence the risk of cancer, it is a preventable disease. The Report specifies recommendations based on solid evidence which, when followed, will be expected to reduce the incidence of cancer

Anti-Insulin Receptor Autoantibodies Are Not Required for Type 2 Diabetes Pathogenesis in NZL/Lt Mice, a New Zealand Obese (NZO)-Derived Mouse Strain

The New Zealand obese (NZO) mouse strain shares with the related New Zealand black (NZB) strain a number of immunophenotypic traits. Among these is a high proportion of B-1 B lymphocytes, a subset associated with autoantibody production. Approximately 50% of NZO/HlLt males develop a chronic insulin-resistant type 2 diabetes syndrome associated with 2 unusual features: the presence of B lymphocyte–enriched peri-insular infiltrates and the development of anti-insulin receptor autoantibodies (AIRAs). To establish the potential pathogenic contributions ofBlymphocytes and AIRAs in this model, a disrupted immunoglobulin heavy chain gene (Igh-6) congenic on the NZB/BlJ background was backcrossed 4 generations into the NZO/HlLt background and was then intercrossed to produce mice that initially segregated for wild-type versus the mutant Igh-6 allele and thus permitted comparison of syndrome development. A new flow cytometric assay (AIRA binding to transfected Chinese hamster ovary cells stably expressing mouse insulin receptor) showed IgM and IgG subclass AIRAs in serum from Igh-6 intact males, but not in Igh6null male serum. However, the absence of B lymphocytes and antibodies distinguishing mutant from wild-type males failed to significantly affect diabetes-free survival. The Igh6nullmales gained weight less rapidly than wild-type males, probably accounting for a retardation, but not prevention, of hyperglycemia. Thus, AIRA and the Blymphocyte component of the peri-insulitis in chronic diabetics were not essential either to development of insulin resistance or to eventual pancreatic beta cell failure and loss. A new substrain, designated NZL, was generated by inbreeding Igh-6 wild-type segregants. Currently at the F10 generation, NZL mice exhibit the same juvenile-onset obesity as NZO/HlLt males, but develop type 2 diabetes at a higher frequency (> 80%). Also, unlike NZO/HlLt mice that are difficult to breed, the NZL/Lt strain breeds well and thus offers clear advantages to obesity/diabetes researchers

Remembering Our Past: Teaching the History of Anatomy at Indiana University

Most students pursuing careers in anatomy or related disciplines have a limited understanding of how, over the centuries, the intricate structure of the human body came to be known. To provide students with the relevant historical perspective, we developed a team-taught survey course in the history of anatomical sciences—including gross anatomy, histology, neuroanatomy, and embryology—from antiquity to the present. Taught entirely via Zoom during the Spring semester of 2021, History of Anatomy (2 semester hours credit) met once per week for approximately 2 hours. Enrollment consisted of 5 undergraduate students majoring in Biology (2), Human Biology (2), or Anthropology (1), as well as 3 graduate students pursuing either a master’s degree in Clinical Anatomy (1) or a Ph.D. in Anatomy Education (2). Three of the students had no prior coursework in anatomy. Through assigned readings, lectures, and discussions, the class explored the work of the great anatomists and their discoveries. A particular emphasis was placed on the evolution of anatomy as a discipline and the cultural influences, scientific controversies, and ethical dilemmas facing its practitioners. Syllabus topics included critical appraisals of the role of gender, race, and ethnicity in anatomical discovery. A key feature of the course was the opportunity for students to engage in robust discussions about such controversial issues as: Eurocentric biases in our understanding of human anatomy and the untold story of Muslim contributions to anatomical knowledge well before Vesalius; Competing claims of priority for who “discovered” the pulmonary circulation; The underappreciated role of women in the history of anatomy and medicine; The ethical quandary of teaching anatomy from archival fetal specimens obtained before the era of informed consent; Accusations that famed anatomist William Hunter used the bodies of murdered pregnant women to create his anatomical atlas of the gravid uterus; Complicity of Eduard Pernkopf and other Nazi-era anatomists in the unethical use of executed victims to obtain images for a renowned anatomical atlas. All students were assessed through weekly homework (written responses to study questions), a mid-term writing assignment, and a term paper about an historical topic of the student’s choosing. Graduate students had the additional requirement of a class presentation about their term paper topic. The end-of-course evaluation suggested that the course was well-received by the students (mean Likert score = 4.63 on a 5-point scale; n = 6). Based on this positive reception, we plan to offer History of Anatomy again on a recurring basis. We believe that by knowing our history, both the good and the bad, future practitioners of anatomy and related disciplines will be less likely to perpetuate the biases and ethical transgressions of earlier eras.American Association for Anatomy Spring Meetin

Invasion Expansion: Time since introduction best predicts global ranges of marine invaders.

Strategies for managing biological invasions are often based on the premise that characteristics of invading species and the invaded environment are key predictors of the invader's distribution. Yet, for either biological traits or environmental characteristics to explain distribution, adequate time must have elapsed for species to spread to all potential habitats. We compiled and analyzed a database of natural history and ecological traits of 138 coastal marine invertebrate species, the environmental conditions at sites to which they have been introduced, and their date of first introduction. We found that time since introduction explained the largest fraction (20%) of the variability in non-native range size, while traits of the species and environmental variables had significant, but minimal, influence on non-native range size. The positive relationship between time since introduction and range size indicates that non-native marine invertebrate species are not at equilibrium and are still spreading, posing a major challenge for management of coastal ecosystems

The macroecology of infectious diseases: a new perspective on global-scale drivers of pathogen distributions and impacts

© 2016 John Wiley & Sons Ltd/CNRS. Identifying drivers of infectious disease patterns and impacts at the broadest scales of organisation is one of the most crucial challenges for modern science, yet answers to many fundamental questions remain elusive. These include what factors commonly facilitate transmission of pathogens to novel host species, what drives variation in immune investment among host species, and more generally what drives global patterns of parasite diversity and distribution? Here we consider how the perspectives and tools of macroecology, a field that investigates patterns and processes at broad spatial, temporal and taxonomic scales, are expanding scientific understanding of global infectious disease ecology. In particular, emerging approaches are providing new insights about scaling properties across all living taxa, and new strategies for mapping pathogen biodiversity and infection risk. Ultimately, macroecology is establishing a framework to more accurately predict global patterns of infectious disease distribution and emergence