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https://www.readbyqxmd.com/read/28430794/experimental-demonstration-of-a-trophic-cascade-in-the-gal%C3%A3-pagos-rocky-subtidal-effects-of-consumer-identity-and-behavior
#1
Jon D Witman, Franz Smith, Mark Novak
In diverse tropical webs, trophic cascades are presumed to be rare, as species interactions may dampen top-down control and reduce their prevalence. To test this hypothesis, we used an open experimental design in the Galápagos rocky subtidal that enabled a diverse guild of fish species, in the presence of each other and top predators (sea lions and sharks), to attack two species of sea urchins grazing on benthic algae. Time-lapse photography of experiments on natural and experimental substrates revealed strong species identity effects: only two predator species-blunthead triggerfish (Pseudobalistes naufragium) and finescale triggerfish (Balistes polylepis)-drove a diurnal trophic cascade extending to algae, and they preferred large pencil urchins (Eucidaris galapagensis) over green urchins (Lytechinus semituberculatus)...
2017: PloS One
https://www.readbyqxmd.com/read/28426679/control-of-zoonotic-cutaneous-leishmaniasis-vector-phlebotomus-papatasi-using-attractive-toxic-sugar-baits-atsb
#2
Abedin Saghafipour, Hassan Vatandoost, Ali Reza Zahraei-Ramazani, Mohammad Reza Yaghoobi-Ershadi, Yavar Rassi, Moharram Karami Jooshin, Mohammad Reza Shirzadi, Amir Ahmad Akhavan
INTRODUCTION: Attractive Toxic Sugar Baits (ATSB) is a new vector control method that meets Integrated Vector Management (IVM) goals. In an experimental design, this study aimed to determine effects of ATSB on control of Phlebotomus papatasi, as a main vector of Zoonotic Cutaneous Leishmaniasis (ZCL), in Qom Province, center of Iran. METHODS: In a cross-sectional design, boric acid was mixed with brown sugar solution and tested as toxic baits for P. papatasi. Two methods were utilized to use the baits: (a) spraying ATSB on vegetation, bushes, and shrubs; and (b) setting ATSB-treated barrier fences in front of colonies at 500 m distance from the houses in outskirts of villages...
2017: PloS One
https://www.readbyqxmd.com/read/28419702/evaluation-of-the-truebeam-machine-performance-check-mpc-mechanical-and-collimation-checks
#3
Michael P Barnes, Peter B Greer
Machine performance check (MPC) is an automated and integrated image-based tool for verification of beam and geometric performance of the TrueBeam linac. The aims of the study were to evaluate the performance of the MPC geometric tests relevant to beam collimation (MLC and jaws) and mechanical systems (gantry and collimator). Evaluation was performed by comparing MPC to QA tests performed routinely in the department over a 4-month period. The MPC MLC tests were compared to an in-house analysis of the Picket Fence test...
April 17, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28416965/a-crisis-of-protection-and-safe-passage-violence-experienced-by-migrants-refugees-travelling-along-the-western-balkan-corridor-to-northern-europe
#4
Jovana Arsenijević, Erin Schillberg, Aurelie Ponthieu, Lucio Malvisi, Waeil A Elrahman Ahmed, Stefano Argenziano, Federica Zamatto, Simon Burroughs, Natalie Severy, Christophe Hebting, Brice de Vingne, Anthony D Harries, Rony Zachariah
BACKGROUND: Pushed by ongoing conflicts and pulled by the desire for a better life, over one million migrants/refugees transited Balkan countries and arrived in Europe during 2015 and early 2016. To curb this influx, European countries instituted restrictive migration policies often characterized by building of razor-wire border fences and border closures. Among migrants/refugees who received mental health care in Serbia while travelling through Balkan countries to Northern Europe, we assessed the prevalence and patterns of violent events experienced including physical trauma...
2017: Conflict and Health
https://www.readbyqxmd.com/read/28411318/long-term-grazing-effects-on-vegetation-characteristics-and-soil-properties-in-a-semiarid-grassland-northern-china
#5
Jing Zhang, Xiaoan Zuo, Xin Zhou, Peng Lv, Jie Lian, Xiyuan Yue
Understanding the responses of vegetation characteristics and soil properties to grazing disturbance is useful for grassland ecosystem restoration and management in semiarid areas. Here, we examined the effects of long-term grazing on vegetation characteristics, soil properties, and their relationships across four grassland types (meadow, Stipa steppe, scattered tree grassland, and sandy grassland) in the Horqin grassland, northern China. Our results showed that grazing greatly decreased vegetation cover, aboveground plant biomass, and root biomass in all four grassland types...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28395963/dosimetric-impact-assessment-using-a-general-algorithm-in-geant4-simulations-for-a-complex-shaped-multileaf-collimator
#6
Á Perales, M A Cortés-Giraldo, H Miras, R Arráns, M I Gallardo
PURPOSE: We have developed an inhouse algorithm for the multileaf collimator (MLC) geometry model construction with an appropriate accuracy for dosimetric tests. Our purpose is to build a complex type of MLC and analyze the influence of the modeling parameters on the dose calculation. METHODS: Using radiochromic films as detector the following tests were done: (I) Density test field: to compare measured and calculated dose distributions in order to determine the tungsten alloy physical density value...
April 7, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28394912/poor-construction-not-time-takes-its-toll-on-subsidised-fences-designed-to-deter-large-carnivores
#7
Jens Frank, Ann Eklund
Large carnivore conservation may be considered as successful in Sweden, as wolf (Canis lupus), lynx (Lynx lynx), brown bear (Ursus arctos), golden eagles (Aquila chrysaetos), and wolverine (Gulo gulo) populations have recovered from extinction or near extinction to viable populations during the last three decades. Particularly the wolf and lynx populations have returned at the cost of an increasing number of carnivore attacks on domestic livestock. To support coexistence between carnivores and livestock production, the Swedish authorities subsidise interventions to prevent or reduce the number of carnivore attacks...
2017: PloS One
https://www.readbyqxmd.com/read/28380552/effects-of-grazing-management-and-buffer-strips-on-metal-runoff-from-pastures-fertilized-with-poultry-litter
#8
C Pilon, P A Moore, D H Pote, J W Martin, P B DeLaune
Metal runoff from fields fertilized with poultry litter may pose a threat to aquatic systems. Buffer strips located adjacent to fields may reduce nutrients and solids in runoff. However, scant information exists on the long-term effects of buffer strips combined with grazing management on metal runoff from pastures. The objective of this study was to assess the 12-yr impact of grazing management and buffer strips on metal runoff from pastures receiving poultry litter. The research was conducted using 15 watersheds (25 m wide and 57 m long) with five treatments: hayed (H), continuously grazed (CG), rotationally grazed (R), rotationally grazed with a buffer strip (RB), and rotationally grazed with a fenced riparian buffer strip (RBR)...
March 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28380550/long-term-effects-of-grazing-management-and-buffer-strips-on-soil-erosion-from-pastures
#9
C Pilon, P A Moore, D H Pote, J H Pennington, J W Martin, D K Brauer, R L Raper, S M Dabney, J Lee
High grazing pressure can lead to soil erosion in pastures, causing increased sediment delivery to waterways. The objectives of this research were to evaluate the impact of grazing management and buffer strips on soil erosion by assessing soil physical properties, hydrology, and sediment loads from pastures fertilized with broiler litter. Field studies were conducted for 12 yr on 15 small watersheds. Five management strategies were evaluated: hayed (H), continuously grazed (CG), rotationally grazed (R), rotationally grazed with a buffer strip (RB), and rotationally grazed with a fenced riparian buffer (RBR)...
March 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28380532/effects-of-a-simulated-wolf-encounter-on-brain-and-blood-biomarkers-of-stress-related-psychological-disorders-in-beef-cows-with-or-without-previous-exposure-to-wolves
#10
R F Cooke, L R Mehrkam, R S Marques, K D Lippolis, D W Bohnert
This experiment compared mRNA expression of brain-blood biomarkers associated with stress-related psychological disorders, including post-traumatic stress disorder (PTSD), in beef cows from wolf-naïve and wolf-experienced origins that were subjected to a simulated wolf encounter. Multiparous, non-pregnant, non-lactating Angus-crossbred cows from the Eastern Oregon Agricultural Research Center (Burns, OR; CON; = 10) and from a commercial operation near Council, ID (WLF; = 10) were used. To date, gray wolves are not present around Burns, OR, and thus CON were naïve to wolves...
March 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28371008/the-epithelial-barrier-and-beyond-claudins-as-amplifiers-of-physiological-organ-functions
#11
REVIEW
Alexander G Markov, Jörg R Aschenbach, Salah Amasheh
Epithelial cell layers are interconnected by a meshwork of tight junction (TJ) protein strands, which are localized within apicolateral membranes. The proteins that form TJs are regarded to provide a static barrier, determining epithelial properties. However, recent findings in the field of barriology suggest that TJs contribute to more physiological aspects than indicated by the sum of the qualities of the single TJ proteins. Generally, TJs exhibit four major functions: (i) a "gate function," defining transepithelial permeability (i...
March 29, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28370099/the-electric-fence-to-cell-cycle-progression-do-local-changes-in-membrane-potential-facilitate-disassembly-of-the-primary-cilium-timely-and-localized-expression-of-a-potassium-channel-may-set-the-conditions-that-allow-retraction-of-the-primary-cilium
#12
REVIEW
Diana Urrego, Araceli Sánchez, Adam P Tomczak, Luis A Pardo
Kv10.1 is a voltage-gated potassium channel relevant for tumor biology, but the underlying mechanism is still unclear. We propose that Kv10.1 plays a role coordinating primary cilium disassembly with cell cycle progression through localized changes of membrane potential at the ciliary base. Most non-dividing cells display a primary cilium, an antenna-like structure important for cell physiology. The cilium is disassembled when the cell divides, which requires an increase of Ca(2+) concentration and a redistribution of phospholipids in its basal region, both of which would be facilitated by local hyperpolarization...
March 30, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28369537/seasonal-patterns-of-stored-product-insects-at-a-rice-mill
#13
Tanja McKay, Amanda L White, Laura A Starkus, Frank H Arthur, James F Campbell
The temporal and spatial patterns in flight activity outside of a rice mill were evaluated for the lesser grain borer [Rhyzopertha dominica (F.)], warehouse beetle [Trogoderma variabile Ballion], cigarette beetle [Lasioderma serricorne (F.)], and Indian meal moth [Plodia interpunctella (Hüϋbner)] to determine critical times of year when the mill would be vulnerable to invasion. Insect activity was monitored using pheromone-baited glue traps (N = 99) from June 2008 to October 2010. Traps were placed along exterior walls of all major buildings and along the fence around the perimeter of the facility...
March 25, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28367581/drowning-in-swimming-pools-clinical-features-and-safety-recommendations-based-on-a-study-of-descriptive-records-by-emergency-medical-services-attending-to-995-calls
#14
Joanna Shi-En Chan, Marie Xin Ru Ng, Yih Yng Ng
INTRODUCTION: This study was a descriptive analysis of national ambulance case records, aimed at making practical safety recommendations in order to reduce the incidence of drowning in swimming pools. METHODS: A search was performed on a national database of descriptive summaries by first responder paramedics of all 995 calls made to the Singapore Civil Defence Force between 1 January 2012 and 31 December 2014. We included all cases of submersion in both public and private pools for which emergency medical services were activated...
April 3, 2017: Singapore Medical Journal
https://www.readbyqxmd.com/read/28352989/electric-fences-and-accidental-death
#15
Michael Burke, Morris Odell, Heinrich Bouwer, Adam Murdoch
Deaths which occur in association with agricultural electric fences are very rare. In fact, electric fences have undoubtedly saved numerous human and animal lives by safely and reliably keeping livestock confined to their fields and enclosures and thus preventing motor vehicle incidents when livestock get onto roads and highways. Accidental and intentional human contact with electric fences occurs regularly and causes little more than transient discomfort, however, on exceptional occasions, contact with electric fences appears to be directly related to the death of the individual...
March 28, 2017: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/28344355/increased-soil-nutrition-and-decreased-light-intensity-drive-species-loss-after-eight-years-grassland-enclosures
#16
Jingpeng Li, Zhirong Zheng, Hongtao Xie, Nianxi Zhao, Yubao Gao
Enclosures (fenced, grazing or clipping) within a certain period of years are the most common tools for restoration of degraded grasslands in temperate regions. Short-term enclosures can improve biodiversity and productivity by effectively relieving grazing pressure, while long-term enclosures can reduce species diversity. We therefore carried out a field experiment to investigate the specific causes of the reduced species diversity in Hulunbeier grassland of northern China. After eight years of enclosure, the significantly increased soil available nitrogen (AN) and available phosphorus (AvP) in enclosure community reduced nitrogen (N) limitation but most vegetation was still N limited...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338915/ungulate-herbivory-alters-leaf-functional-traits-and-recruitment-of-regenerating-aspen
#17
Aaron C Rhodes, Val Anderson, Samuel B St Clair
Herbivory by ungulates can affect forest regeneration success, but its long-term impacts on tree function and recruitment are less studied. We evaluated strategies of resistance, tolerance and vertical escape against ungulate herbivory by evaluating leaf traits (photosynthesis, morphology and chemistry) and growth rates of aspen in the presence and absence of ungulate herbivores 1, 2, 3 and 26 years after fires initiated aspen suckering. Over the initial 3-year period, ~60% of aspen stems in unfenced plots showed evidence of being browsed by ungulates...
March 1, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28338053/optimal-array-of-sand-fences
#18
Izael A Lima, Ascânio D Araújo, Eric J R Parteli, José S Andrade, Hans J Herrmann
Sand fences are widely applied to prevent soil erosion by wind in areas affected by desertification. Sand fences also provide a way to reduce the emission rate of dust particles, which is triggered mainly by the impacts of wind-blown sand grains onto the soil and affects the Earth's climate. Many different types of fence have been designed and their effects on the sediment transport dynamics studied since many years. However, the search for the optimal array of fences has remained largely an empirical task...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28325625/-serological-detection-of-brucella-suis-influenza-virus-and-aujeszky-s-disease-virus-in-backyard-and-small-swine-holders-in-argentina
#19
Marina Dibarbora, Javier A Cappuccio, María N Aznar, Fernando A Bessone, Hernán Piscitelli, Ariel J Pereda, Daniel R Pérez
Farmers raising less than 100 sows represent more than 99% of swine producers in Argentina, although little is known about their sanitary status and productive characteristics in the country. Sanitary and productive information was obtained. Furthermore, samples for serological studies were taken to detect antibodies against Brucella suis (Bs), Aujeszky's disease virus (AV) and influenza virus (IV) in 68 backyard and small producers with less than 100 sows located in the north, central and south regions of Argentina...
March 18, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28300969/rat-infestation-associated-with-environmental-deficiencies-in-an-urban-slum-community-with-high-risk-of-leptospirosis-transmission
#20
Norlan de Jesus Santos, Erica Sousa, Mitermayer G Reis, Albert I Ko, Federico Costa
We analyzed environmental factors that provide food, water and harborage to rodents and the risk of household rodent infestation in a slum community with a high risk of leptospirosis transmission. Detailed environmental surveys were performed in 221 households. Multivariate regression models evaluated the association between rodent infestation and socioeconomic status and environmental attributes obtained from Geographical Information System surveys. The general household infestation rate was 45.9%. Rattus norvegicus signs were the most prevalent, present in 74% of the infested households...
March 9, 2017: Cadernos de Saúde Pública
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