Planting the Seeds for Public Health: How the Farm Bill Can Help Farmers to Produce and Distribute Healthy Foods

Analyzes provisions in the 2008 Farm Bill that impede farmers' production and strategic marketing of fruits and vegetables. Recommends policy changes to remove such barriers, improve consumer access to healthy foods, and help prevent childhood obesity

Gypsy moths and American dog ticks: Space partners

An experiment intended for the space shuttle and designed to investigate the effects of weightlessness and total darkness on gypsy moth eggs and engorged American dog ticks is described. The objectives are: (1) to reevaluate the effects of zero gravity on the termination of diapause/hibernation of embryonated gypsy moth eggs, (2) to determine the effect of zero gravity on the ovipositions and subsequent hatch from engorged female American dog ticks that have been induced to diapause in the laboratory, and (3) to determine whether morphological or biochemical changes occur in the insects under examination. Results will be compared with those from a similar experiment conducted on Skylab 4

The application of semiconductors to quasi- optical isolators for use at submillimeter wavelengths

Semiconductor application to quasi-optical isolators - nonreciprocal reflection beam isolator and far infrared isolators using Faraday rotatio

Phase Transition in the Number Partitioning Problem

Number partitioning is an NP-complete problem of combinatorial optimization. A statistical mechanics analysis reveals the existence of a phase transition that separates the easy from the hard to solve instances and that reflects the pseudo-polynomiality of number partitioning. The phase diagram and the value of the typical ground state energy are calculated.Comment: minor changes (references, typos and discussion of results

Probing gas and dust in the tidal tail of NGC 5221 with the type Ia supernova iPTF16abc

Context. Type Ia supernovae (SNe Ia) can be used to address numerous questions in astrophysics and cosmology. Due to their well known spectral and photometric properties, SNe Ia are well suited to study gas and dust along the lines-of-sight to the explosions. For example, narrow Na I D and Ca II H&K absorption lines can be studied easily, because of the well-defined spectral continuum of SNe Ia around these features. Aims. We study the gas and dust along the line-of-sight to iPTF16abc, which occurred in an unusual location, in a tidal arm, 80 kpc from centre of the galaxy NGC 5221. Methods. Using a time-series of high-resolution spectra, we examine narrow Na I D and Ca II H&K absorption features for variations in time, which would be indicative for circumstellar (CS) matter. Furthermore, we take advantage of the well known photometric properties of SNe Ia to determine reddening due to dust along the line-of-sight. Results. From the lack of variations in Na I D and Ca II H&K, we determine that none of the detected absorption features originate from the CS medium of iPTF16abc. While the Na I D and Ca II H&K absorption is found to be optically thick, a negligible amount of reddening points to a small column of interstellar dust. Conclusions. We find that the gas along the line-of-sight to iPTF16abc is typical of what might be found in the interstellar medium (ISM) within a galaxy. It suggests that we are observing gas that has been tidally stripped during an interaction of NGC 5221 with one of its neighbouring galaxies in the past $\sim10^9$ years. In the future, the gas clouds could become the locations of star formation. On a longer time scale, the clouds might diffuse, enriching the circum-galactic medium (CGM) with metals. The gas profile along the line-of-sight should be useful for future studies of the dynamics of the galaxy group containing NGC 5221.Comment: 8 pages, 6 figure

Reconsidering the classification of sweet taste liker phenotypes: a methodological review

Human ingestive behavior depends on myriad factors, including both sensory and non-sensory determinants. Of the sensory determinants, sweet taste is a powerful stimulus and liking for sweetness is widely accepted as an innate human trait. However, the universality of sweet-liking has been challenged. Sub-groups exhibiting strong liking (sweet likers) or having aversive responses to sweet taste (sweet dislikers) have been described, but the methods defining these phenotypes are varied and inconsistent across studies. Here, we explore the strengths and weaknesses of different methodological approaches in identifying sweet taste liker phenotypes in a comprehensive review. Prior studies (N = 71) using aqueous sucrose solution-based taste tests and a definition of two or more distinct hedonic responses reported between 1970 and 2017 were summarized. Broadly speaking, four different phenotyping methods have been used: 1. Interpretation (visual or statistical) of the shape of hedonic response curves, 2. Highest preference using ratings, 3. Average liking above mid-point or Positive/Negative average liking method, and 4. Highest preference via paired comparisons. Key methodological weaknesses included the use of subjective or arbitrary criteria as well as adoption of protocols unsuitable for large-scale implementation. Overall, we did not identify a method distinctly superior to the others. Given the role of both hedonics and reward in food intake, a better understanding of individual variations in sweet taste perception could clarify how sweet-liking interplays with obesity or addictive behaviors such as alcohol misuse and abuse. The development of a universally used statistically robust and less time-consuming classification method is needed

Quantifying sweet taste liker phenotypes: time for some consistency in the classification criteria

Taste hedonics is a well-documented driver of food consumption. The role of sweetness in directing ingestive behavior is largely rooted in biology. One can then intuit that individual differences in sweet-liking may constitute an indicator of variations in the susceptibility to diet-related health outcomes. Despite half a century of research on sweet-liking, the best method to identify the distinct responses to sweet taste is still debated. To help resolve this issue, liking and intensity ratings for eight sucrose solutions ranging from 0 to 1 M were collected from 148 young adults (29% men). Hierarchical cluster analysis (HCA) revealed three response patterns: a sweet-liker (SL) phenotype characterized by a rise in liking as concentration increased, an inverted U-shaped phenotype with maximum liking at 0.25 M, and a sweet-disliker (SD) phenotype characterized by a decline in liking as a function of concentration. Based on sensitivity and specificity analyses, present data suggest the clearest discrimination between phenotypes is seen with 1.0 M sucrose, where a liking rating between −15 and +15 on a −50/+50 scale reliably distinguished individuals with an inverted U-shaped response from the SLs and the SDs. If the efficacy of this approach is confirmed in other populations, the discrimination criteria identified here can serve as the basis for a standard method for classifying sweet taste liker phenotypes in adults

A qualitative investigation of LGBTQ+ young people’s experiences and perceptions of self-management of their mental health

There is evidence that young people generally self-manage their mental health using self-care strategies, coping methods and other self-management techniques, which may better meet their needs or be preferable to attending specialist mental health services. LGBTQ+ young people are more likely than their peers to experience a mental health difficulty and may be less likely to draw on specialist support due to fears of discrimination. However, little is known about LGBTQ+ young people’s experiences and perceptions of self-managing their mental health. Using a multimodal qualitative design, 20 LGBTQ+ young people participated in a telephone interview or an online focus group. A semi-structured schedule was employed to address the research questions, which focussed on LGBTQ+ young people’s experiences and perceptions of self-managing their mental health, what they perceived to stop or help them to self-manage and any perceived challenges to self-management specifically relating to being LGBTQ+ . Reflexive thematic analysis yielded three key themes: (1) self-management strategies and process, (2) barriers to self-management and (3) facilitators to self-management. Participants’ most frequently mentioned self-management strategy was ‘speaking to or meeting up with friends or a partner’. Both barriers and facilitators to self-management were identified which participants perceived to relate to LGBTQ+ identity. Social support, LGBTQ+ youth groups and community support were identified as key facilitators to participants’ self-management of their mental health, which merits further investigation in future research. These findings also have important implications for policy and intervention development concerning LGBTQ+ young people’s mental health

Self-management, self-care, and self-help in adolescents with emotional problems

Objective: The objective of this scoping review is to draw on existing literature to illuminate the ways in which the concepts of self-management, self-care, and self-help are defined in the context of adolescents with emotional problems. The aim is to describe and categorize the definitions of these concepts as well as the strategies or techniques that have been proposed to facilitate self-management, self-care, and self-help for this group, as this may have important implications for policy and intervention development. / Introduction: There is evidence that emotional problems are rising amongst adolescents, while timely access to specialist mental health treatment is limited to adolescents with greater severity of mental health difficulties. Concurrently, self-management, self-care, and self-help strategies may be used by adolescents. Owing to the overlap in existing definitions and lack of clarity around these concepts in a youth mental health context, a scoping review of the literature is warranted. / Inclusion criteria: Studies involving adolescents aged 10 to 19 with symptoms of emotional problems that reference self-management, self-care, or self-help will be included. / Methods: MEDLINE, Embase, PsycINFO, Web of Science, CINAHL, Google Scholar, and MedNar will be searched for English-language texts from the year 2000 onward. A map or typology of definitions will be presented alongside a narrative summary of the results

Degree of free fatty acid saturation influences chocolate rejection in human assessors

In foods, free fatty acids (FFA) traditionally have been viewed as contributing an odor, yet evidence has accumulated that FFA also contribute a unique taste (“oleogustus”). However, minimal work has been conducted using actual foods to test the contribution of FFA to taste preferences. We chose to investigate flavor, taste, and aroma contributions of added FFA in chocolate, as some commercial manufacturers already use lipolysis of triglycerides to generate unique profiles. We hypothesized small added concentrations of FFA would increase preferences for chocolate while higher added concentrations would decrease preferences. We also hypothesized a saturated fatty acid (stearic C18) would have a lesser effect than a monounsaturated (oleic C18:1), which would have a lesser effect than a polyunsaturated (linoleic C18:2) fatty acid. For each, paired preference tests were conducted for 10 concentrations (0.04% to 2.25%) of added FFA compared to control chocolate without added FFAs. Stearic acid was tested for flavor (tasting, nares open), while the unsaturated fatty acids were tested for both aroma (orthonasal only, no tasting) and taste (tasting with nares blocked to eliminate retronasal odor). We found no preference for any added FFA chocolate; however, rejection was observed independently for both taste and aroma of unsaturated fatty acids, with linoleic acid reaching rejection at lower concentrations than oleic acid. These data indicate degree of unsaturation influences rejection of both FFA aroma and taste in chocolate. Thus, alterations of FFA profiles in foods should be approached cautiously to avoid shifting concentrations of unsaturated fatty acids to hedonically unacceptable levels