599 research outputs found

    Current Trends in Small Unmanned Aircraft Systems: Implications for U.S. Special Operations Forces

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    This paper assesses current trends in small unmanned aircraft systems (sUAS) technology and its applications to the Special Operations Forces (SOF) community. Of critical concern to SOF is that commercial-off-the-shelf (COTS) sUAS technologies are relatively inexpensive, improving at a dramatic rate, and widely available throughout the world. Insurgents, terrorists, violent extremist organizations (VEOs) and other nefarious actors have used COTS sUAS to conduct offensive attacks as well as to develop battlefield situation awareness; these technological improvements combined with their widespread availability will require enhanced and rapidly adaptive counter-sUAS measures in the future. To understand the most current trends in the unmanned aircraft systems (UAS) technology and their applicability to SOF, this paper analyzes the definition and classification of sUAS, their major applications, and characteristics. In the military context, UAS are principally used for intelligence, surveillance, and reconnaissance (ISR), border security, counterinsurgency, attack and strike, target identification and designation, communications relay, electronic attack, remote sensing, and aerial mapping. As technology improves, smaller versions of sUAS will be used by both friendly operators and maligned actors (insurgents, terrorists, VEOs, nation states) as force multipliers for military operations. As armed forces around the world continue to invest in research and development of sUAS technologies, there will be tremendous potential to revolutionize warfare, particularly in context of special operations. Consequently, the use of sUAS technology by SOF is likely to escalate over the next decade, as is the likelihood of sUAS countermeasures due to the availability of the technology within nefarious organizations

    Analysis of socio-economic aspects of local and national organic farming markets; final report for Defra

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    The purpose of this study was to take a fresh look at the nature of organic production, consumption and marketing in England and Wales in order to better assess its current and likely contribution to rural development and its ability to meet consumer expectations. Based on a mixed methodological approach the study consulted with 2,300 individuals to reveal a complex and multi-dimensional sector with a highly committed consumer base. The research aimed to describe and account for: (1)The socio-economic impacts of the organic farm supply chains on rural development; (2)The extent to which organic food delivers consumer expectations; and (3) The barriers affecting conversion to organic farming and expansion of existing organic farms. The research reported here is arguably one of the most integrated studies of organic consumption, production and marketing conducted to date. It throws new light on the nature of organic consumption, underlining both the on-going commitment of the majority of committed organic consumers and the gap in perceptions, degrees of ‘brand trust’ and price sensitivity between this group and the majority of consumers who rarely or never buy organic. While this degree of commitment suggests that recent declines in organic consumption may not be sustained and will soon hit a floor, this finding also points to difficulties, particularly in a time of recession, in enrolling new consumers into organic networks, particularly via the direct marketing channels that smaller producers are more likely to depend on. This group of producers, locally embedded and linked to consumers via short supply chains, fulfil the expectations of many organic consumers and exemplify the idea of alternative food producers. Managed by self selecting, entrepreneurial farmers, these organic producers make a valuable contribution towards employment and income generation within the local rural economy. As our broader analysis of food chains and multiplier effects across the regional and national rural economy shows, however, it is the large scale producers, concerned with the production of bulk commodities and integrated into long supply chains, that inevitably account for the main rural employment and income benefits of the organic sector, if measured in aggregate terms. While there is a good case to be made for the rural development benefits of organic farming, it is important to recognise these scale effects and their geographically uneven distribution in any policy assessment.Organic markets, Organic farming, Organic consumers, Rural Economy, Multiplier Analysis, Simple Value Chains, Agricultural and Food Policy, Consumer/Household Economics, Farm Management, Food Consumption/Nutrition/Food Safety, Marketing,

    Expanding the neurological phenotype of ring chromosome 10 syndrome: A case report and review of the literature

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    Ring chromosome 10 [r(10)] syndrome is a rare genetic condition, currently described in the medical literature in a small number of case report studies. Typical clinical features include microcephaly, short stature, facial dysmorphisms, ophthalmologic abnormalities and genitourinary malformations. We report a novel case of r(10) syndrome and review the neurological and neuro-radiological phenotypes of the previously described cases. Our patient, a 3 year old Italian girl, represents the 20th case of r(10) syndrome described to date. Intellectual disability/developmental delay (ID/DD), microcephaly, strabismus, hypotonia, stereotyped/aggressive behaviors and elec-troencephalographic abnormalities were identified in our patient, and in a series of previous cases. A brain MRI disclosed a complex malformation involving both the vermis and cerebellar hemispheres; in the literature, posterior cranial fossa abnormalities were documented by CT scan in another case. Two genes deleted in our case (ZMYND11 in 10p and EBF3 in 10q) are involved in autosomal dominant neurodevelopmental disorders, characterized by different expressions of brain and posterior cranial fossa abnormalities, ID/DD, hypotonia and behavioral problems. Our case expands the neurological and neuroradiological phenotype of r(10) syndrome. Although r(10) syndrome represents an extremely rare condition, with a clinical characterization limited to case reports, the recurrence of specific neurological and neuroradiological features suggests the need for specific genotype-phenotype studies

    Rural Islandness as a Lens for (Rural) HCI

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    Anti-tick microbiota vaccine impacts ixodes ricinus performance during feeding

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    The tick microbiota is a highly complex ensemble of interacting microorganisms. Keystone taxa, with a central role in the microbial networks, support the stability and fitness of the microbial communities. The keystoneness of taxa in the tick microbiota can be inferred from microbial co-occurrence networks. Microbes with high centrality indexes are highly connected with other taxa of the microbiota and are expected to provide important resources to the microbial community and/or the tick. We reasoned that disturbance of vector microbiota by removal of ubiquitous and abundant keystone bacteria may disrupt the tick-microbiota homeostasis causing harm to the tick host. These observations and reasoning prompted us to test the hypothesis that antibodies targeting keystone bacteria may harm the ticks during feeding on immunized hosts. To this aim, in silico analyses were conducted to identify keystone bacteria in the microbiota of Ixodes nymphs. The family Enterobacteriaceae was among the top keystone taxa identified in Ixodes microbiota. Immunization of a-1, 3-galactosyltransferase-deficient-C57BL/6 (a1, 3GT KO) mice with a live vaccine containing the Enterobacteriaceae bacterium Escherichia coli strain BL21 revealed that the production of anti-E. coli and anti-a-Gal IgM and IgG was associated with high mortality of I. ricinus nymphs during feeding. However, this effect was absent in two different strains of wild type mice, BALB/c and C57BL/6. This result concurred with a wide distribution of a-1, 3-galactosyltransferase genes, and possibly a-Gal, in Enterobacteriaceae and other bacteria of tick microbiota. Interestingly, the weight of I. ricinus nymphs that fed on E. coli-immunized C57BL/6 was significantly higher than the weight of ticks that fed on C57BL/6 immunized with a mock vaccine. Our results suggest that anti-tick microbiota vaccines are a promising tool for the experimental manipulation of vector microbiota, and potentially the control of ticks and tick-borne pathogens

    Anti-microbiota vaccines modulate the tick microbiome in a taxon-specific manner

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    The lack of tools for the precise manipulation of the tick microbiome is currently a major limitation to achieve mechanistic insights into the tick microbiome. Anti-tick microbiota vaccines targeting keystone bacteria of the tick microbiota alter tick feeding, but their impact on the taxonomic and functional profiles of the tick microbiome has not been tested. In this study, we immunized a vertebrate host model (Mus musculus) with live bacteria vaccines targeting keystone (i.e., Escherichia-Shigella) or non-keystone (i.e., Leuconostoc) taxa of tick microbiota and tested the impact of bacterial-specific antibodies (Abs) on the structure and function of tick microbiota. We also investigated the effect of these anti-microbiota vaccines on mice gut microbiota composition. Our results showed that the tick microbiota of ticks fed on Escherichia coli-immunized mice had reduced Escherichia-Shigella abundance and lower species diversity compared to ticks fed on control mice immunized with a mock vaccine. Immunization against keystone bacteria restructured the hierarchy of nodes in co-occurrence networks and reduced the resistance of the bacterial network to taxa removal. High levels of E. coli-specific IgM and IgG were negatively correlated with the abundance of Escherichia-Shigella in tick microbiota. These effects were not observed when Leuconostoc was targeted with vaccination against Leuconostoc mesenteroides. Prediction of functional pathways in the tick microbiome using PICRUSt2 revealed that E. coli vaccination reduced the abundance of lysine degradation pathway in tick microbiome, a result validated by qPCR. In contrast, the gut microbiome of immunized mice showed no significant alterations in the diversity, composition and abundance of bacterial taxa. Our results demonstrated that anti-tick microbiota vaccines are a safe, specific and an easy-to-use tool for manipulation of vector microbiome. These results guide interventions for the control of tick infestations and pathogen infection/transmission. © Copyright © 2021 Mateos-Hernández, Obregón, Wu-Chuang, Maye, Bornères, Versillé, de la Fuente, Díaz-Sánchez, Bermúdez-Humarán, Torres-Maravilla, Estrada-Peña, Hodžic, Šimo and Cabezas-Cruz
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