1,858 research outputs found
The first use of Fulton's K for assessing and comparing the conditions of inter-tidal fish populations
Fulton's K condition factor was applied, for the first time, to inter-tidal specimens of the shanny (Lipophrys pholis) and long-spined scorpion fish (Taurulus bubalis) from two English rocky shore and two Welsh rocky shore sites during summer 2010 and winter 2011. As both species contribute to the diet of commercial species such as cod (Gadus morhua) and near-threatened species such as the European otter (Lutra lutra), their condition may affect that of these predators. Fulton's K found that inter-tidal Welsh fish maintained a âgoodâ condition between seasons, whereas the inter-tidal English fish were in a poorer condition during winter. Although condition also changed amongst the sites on each coast, further studies are needed into fish morphologies, environmental parameters, prey availabilities and abundances, and fish specimen sex and maturities
External morphology of eyes and Nebenaugen of caridean decapodsâecological and systematic considerations
Most caridean decapods have compound eyes of the reflecting superposition kind, and additionally some possess an accessory eye-like organ of unknown function, also referred to as the nebenauge.We examined 308 caridean genera to assess the general morphology of the eye, rostrum length, eye diameter and the presence or absence and, when present, the diameter of the nebenauge.We have attempted to relate these data to ecological and taxonomic considerations.We consider there to be 6 distinct eye types based on the margin between the eyestalk and cornea. The presence of nebenaugen appears to be generally linked to an active lifestyle, as evidenced by the fact that species that have nebenaugen tend to have larger eyes and are more likely to have a distinct rostrum.We suggest that the inconsistencies in its presence/absence under both systematic and ecological lenses may indicate that when present it has various roles relating to behavioural and physiological rhythms
One evidence base; three stories: do opioids relieve chronic breathlessness?
Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/. The efficacy of low-dose systemic opioids for chronic breathlessness was questioned by the recent Cochrane review by Barnes et al We examined the reasons for this conflicting finding and re-evaluated the efficacy of systemic opioids. Compared with previous meta-analyses, Barnes et al reported a smaller effect and lower precision, but did not account for matched data of crossover trials (11/12 included trials) and added a risk-of-bias criterion (sample size). When re-analysed to account for crossover data, opioids decreased breathlessness (standardised mean differences -0.32; -0.18 to -0.47; I2=44.8%) representing a clinically meaningful reduction of 0.8 points (0-10 numerical rating scale), consistent across meta-analyses
Linking eye design with host symbiont relationships in pontoniine shrimps (crustacea, decapoda, palaemonidae)
Symbiosis is prevalent in the marine environment with many studies examining the effects of such interactions between host and symbiont. Pontoniine shrimps are a group whose ecology is characterised by symbiotic interactions. This investigation examines the gross morphology of Pontoniinae compound eyes and superficial optical parameters with reference to their symbiotic relationship or lifestyle category; free-living, ectosymbiont, endosymbiont (bivalves) or endosymbiont (non-bivalves). The eye morphologies of free-living and ectosymbiotic species are very similar, yet differ from both forms of endosymbiotic species. Endosymbionts have significantly smaller and simpler eyes with larger facets and bigger interommatidial angles and eye parameters for increased sensitivity levels. However bivalve endosymbionts form an intermediary group between non-bivalve endosymbionts and ectosymbionts as a result of their more active lifestyle. The accessory eye or "nebenauge", although of uncertain function, commonly occurs in free-living Pontoniinae species but rarely in endosymbionts apart from in more primitive species. The variation in morphology reflects tensions between functional requirements and ecological pressures that have strongly influenced eye design in Pontoniinae. © 2014 Dobson et al
âReeling Inâ Grimm Masculinities: Hucksters, Cross-Dressers, and Ninnies
In American films Wilhelm and Jacob Grimm appear as malleable as the folktales they collected and published. Not just framed by their cultural production, the Grimms are read through it. As a result, North American assumptions about folktales and fairy tales imbue the brothers with peculiar characteristics. The pliability of the brothers across mediated representations encourages viewers to interrogate the authority of storytellers and historical truth. I describe the filmed Grimmsâ failure to meet American cinemaâs normative standards for heterosexual masculine performance and explore the tension between feminized oral traditions and masculinized literary heritage that resurfaces in each film
Department of Pediatrics
This departmental history was written on the occasion of the UND Quasquicentennial in 2008.https://commons.und.edu/departmental-histories/1090/thumbnail.jp
Grain marketing in the Knoxville area
The purpose of this study is to analyze the grain situation and related industries and to determine what can be done to develop or improve outlets for grain in the Knoxville trade area. The study deals with the production, disposition, consumption, and demand of grain and grain produce grown in the area and problems of competition from grain shipped in from other areas.
ln showing the extent to which local demands for grain are being met by local production the study will point the way to adjustments which the farmers of the area might profitably make in the production and marketing of grain and the activities which might be undertaken by the grain dealers to develop better markets for locally grown grain.
The study should primarily be of interest to farmers, local grain dealers, extension workers and students not fully informed on some of the more common problems of grain marketing
Cutting and Pasting in the Torelli Group
We introduce machinery to allow ``cut-and-paste''-style inductive arguments
in the Torelli subgroup of the mapping class group. In the past these arguments
have been problematic because restricting the Torelli group to subsurfaces
gives different groups depending on how the subsurfaces are embedded. We define
a category \TSur whose objects are surfaces together with a decoration
restricting how they can be embedded into larger surfaces and whose morphisms
are embeddings which respect the decoration. There is a natural ``Torelli
functor'' on this category which extends the usual definition of the Torelli
group on a closed surface. Additionally, we prove an analogue of the Birman
exact sequence for the Torelli groups of surfaces with boundary and use the
action of the Torelli group on the complex of curves to find generators for the
Torelli group. For genus only twists about (certain) separating
curves and bounding pairs are needed, while for genus a new type of
generator (a ``commutator of a simply intersecting pair'') is needed. As a
special case, our methods provide a new, more conceptual proof of the classical
result of Birman-Powell which says that the Torelli group on a closed surface
is generated by twists about separating curves and bounding pairs.Comment: 33 pages, 8 figures, some stylistic improvements; to appear in
Geometry and Topolog
The independent association of overweight and obesity with breathlessness in adults: a cross-sectional, population-based study
Obesity is an independent risk factor for chronic breathlessness and should be assessed in people with this symptom
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