Biomechanical Evaluation of Surgical Loupes

Cervical musculoskeletal disorders (MSDs) are a known occupational hazard in micro surgeons who use loupes (telescopes mounted on glasses) to operate, with over 80% having neck pain related to performing surgery. Despite this known occupational risk, the cause, prevention, and treatment of cervical MSDs have been largely ignored in this population. The objective of this study was to quantify the effect of loupe use on cervical spine load and characterize the impact of loupe mount angle. In the study, loupes were systematically altered during surgical tasks simulated by twelve healthy individuals (6 male and 6 female) in a laboratory setting. Four loupe conditions; without loupes, and with the loupe mounted at 10 degrees, 20 degrees, and 30 degrees, were tested in this study. The cervical spine loading was evaluated using three-dimensional head and neck postures (rotational as well as translational), electrical activity of the neck muscles and perceived discomfort ratings. Loupe condition had no effect on the rotational head and neck postures, neck muscle activity and discomfort ratings. Head flexion of about 30 degrees was observed during the surgical tasks; bending and rotation ranged between 4 to 7 degrees. Activation of about 3 to 7% of Maximum Voluntary Contraction (MVC) was observed for the neck muscles. A significant effect of loupe condition on the translational motion in the anterior-posterior and inferior-superior directions was observed, suggesting that the use of loupe may force a more erect or straightened neck posture. Some gender differences in the posture, muscle activity pattern and perceived discomfort ratings were also observed

Loupe: Verifying Publish-Subscribe Architectures with a Magnifying Lens

CONE

Observing the Earth as an exoplanet with LOUPE, the Lunar Observatory for Unresolved Polarimetry of Earth

The detections of small, rocky exoplanets have surged in recent years and will likely continue to do so. To know whether a rocky exoplanet is habitable, we have to characterise its atmosphere and surface. A promising characterisation method for rocky exoplanets is direct detection using spectropolarimetry. This method will be based on single pixel signals, because spatially resolving exoplanets is impossible with current and near-future instruments. Well-tested retrieval algorithms are essential to interpret these single pixel signals in terms of atmospheric composition, cloud and surface coverage. Observations of Earth itself provide the obvious benchmark data for testing such algorithms. The observations should provide signals that are integrated over the Earth's disk, that capture day and night variations, and all phase angles. The Moon is a unique platform from where the Earth can be observed as an exoplanet, undisturbed, all of the time. Here, we present LOUPE, the Lunar Observatory for Unresolved Polarimetry of Earth, a small and robust spectropolarimeter to observe our Earth as an exoplanet.Comment: 14 pages, 3 figures, submitted in special Issue of Planetary and Space Science on Scientific Preparations for Lunar Exploratio

Through the Loupe : Visitor engagement with a primarily text-based handheld AR application

The use of Augmented Reality (AR) in a museum or heritage setting holds great potential. However, until now, introducing AR into their buildings has been prohibitively expensive for most museums. On the one hand, programming the AR application could not be done in-house and would be rather costly. Secondly, the time-consuming production of high-quality digital visuals, often used in AR installations, needed to be outsourced. With the arrival of several AR engines, creating the actual experience has become easy, relatively fast and cheap, meaning the costs and skills associated with content creation might be the prime reason for particularly small and medium sized museums to not engage with the use of AR. This begs the question: Can other, simpler, types of content, such as texts, also be used to create a valued AR interpretation tool? This paper will discuss a study that has made a first attempt to answering this question. In addition, it explored the role AR can play in improving engagement between visitor, the object and its related information. The Loupe is a handheld AR application that was designed and tested as part of the meSch project. For this study, content, mainly consisting of text, was created for the Loupe at the Allard Pierson Museum. The tool was then tested with 22 participants who were asked to use the Loupe, either alone or together. Through questionnaires, observations and interviews, participants' engagement with and response to the Loupe were analyzed. This paper will discuss the findings of that study, focusing on the way the Loupe influenced the relationship between visitor and object, as well as the value of textual content as part of such an AR tool

The beetle fauna of Dominica, Lesser Antilles (Insecta: Coleoptera) : diversity and distribution

The beetle fauna of the island of Dominica is summarized. It is presently known to contain 269 genera, and 361 species (in 42 families), of which 347 are named at a species level. Of these, 62 species are endemic to the island. The other naturally occurring species number 262, and another 23 species are of such wide distribution that they have probably been accidentally introduced and distributed, at least in part, by human activities. Undoubtedly, the actual numbers of species on Dominica are many times higher than now reported. This highlights the poor level of knowledge of the beetles of Dominica and the Lesser Antilles in general. Of the species known to occur elsewhere, the largest numbers are shared with neighboring Guadeloupe (201), and then with South America (126), Puerto Rico (113), Cuba (107), and Mexico-Central America (108). The Antillean island chain probably represents the main avenue of natural overwater dispersal via intermediate stepping-stone islands. The distributional patterns of the species shared with Dominica and elsewhere in the Caribbean suggest stages in a dynamic taxon cycle of species origin, range expansion, distribution contraction, and re-speciation

Sulfur amino acid requirements of broilers from two to five weeks of age

Phase-feeding (PF) in broiler chickens has been researched as a way to reduce feed costs without reducing growth performance and yield. Predicted amino acid requirements for PF are generated using linear regression equations derived from best estimates of lysine (Lys), sulfur amino acid (SAA), and threonine (Thr) requirements. During the late starter and early grower periods, predicted requirements for the SAA methionine (Met) and cysteine (Cys) are higher than levels recommended by the National Research Council (NRC), and previous research suggests that SAA may be lowered during the grower period without sacrificing growth performance or yield. The objective of this study was to estimate Met and Cys requirements for broilers from 2 to 5 weeks of age. In Experiment 1, a Met-deficient corn-peanut meal diet was formulated to contain excess Cys, so that supplemental Met was not utilized for Cys synthesis. The basal diet for Experiment 2 met the Met requirement but was deficient in Cys. Graded levels of Met (0, 0.045, 0.09, 0.135, and 0.225%) and Cys (0, 0.035, 0.070, 0.105, 0.140, 0.175%) were added in Experiments 1 and 2, respectively, and diets were fed to five replicates of five broilers per pen. Broken-line analysis was used to estimate SAA requirements. The digestible Met and Cys requirements from 2 to 5 weeks of age were 0.33% and 0.31%, respectively. Requirement estimates were lower than those predicted by PF or recommended by NRC, indicating that lower SAA levels may be utilized in a PF progra

LOUPE: Observing Earth from the Moon to prepare for detecting life on Earth-like exoplanets

LOUPE, the Lunar Observatory for Unresolved Polarimetry of the Earth, is a small, robust spectro-polarimeter with a mission to observe the Earth as an exoplanet. Detecting Earth-like planets in stellar habitable zones is one of the key challenges of modern exoplanetary science. Characterising such planets and searching for traces of life requires the direct detection of their signals. LOUPE provides unique spectral flux and polarisation data of sunlight reflected by the Earth, the only planet known to harbor life. This data will be used to test numerical codes to predict signals of Earth-like exoplanets, to test algorithms that retrieve planet properties, and to fine-tune the design and observational strategies of future space observatories. From the Moon, LOUPE will continuously see the entire Earth, enabling it to monitor the signal changes due to the planet's daily rotation, weather patterns, and seasons, across all phase angles. Here, we present both the science case and the technology behind LOUPE's instrumental and mission design.Comment: 13 pages, 5 figures. Accepted for publication in Royal Society Philosophical Transactions A. Corrected typos in v

Assessment of microbranding as an alternative marking technique for long-term identification of New Zealand lizards

‘Microbranding’, a system for individually identifying reptiles and amphibians based on a numbered code of spot brands applied to the body and limbs, was tested on New Zealand skinks and geckos. Common geckos (Woodworthia maculata) and copper skinks (Oligosoma aeneum) were used as test animals. Brands applied in autumn took 3 months or more to heal. There was no evidence of brand-related mortality or increased parasite loads in branded animals. However, after healing the brands faded very rapidly in the skinks to become totally unreadable in all surviving branded skinks after 2.5 years and not accurately readable in most geckos after 3 years. We therefore consider the technique unsuitable as a standard marking procedure for New Zealand lizards