Charreton M.,French National Institute for Agricultural Research |
Decourtye A.,UMT |
Decourtye A.,Itsap Institute Of Labeille |
Henry M.,French National Institute for Agricultural Research |
And 4 more authors.
PLoS ONE | Year: 2015
The toxicity of pesticides used in agriculture towards non-targeted organisms and especially pollinators has recently drawn the attention from a broad scientific community. Increased honeybee mortality observed worldwide certainly contributes to this interest. The potential role of several neurotoxic insecticides in triggering or potentiating honeybee mortality was considered, in particular phenylpyrazoles and neonicotinoids, given that they are widely used and highly toxic for insects. Along with their ability to kill insects at lethal doses, they can compromise survival at sublethal doses by producing subtle deleterious effects. In this study, we compared the bee's locomotor ability, which is crucial for many tasks within the hive (e.g. cleaning brood cells, feeding larvae. . .), before and after an acute sublethal exposure to one insecticide belonging to the two insecticide classes, fipronil and thiamethoxam. Additionally, we examined the locomotor ability after exposure to pyrethroids, an older chemical insecticide class still widely used and known to be highly toxic to bees as well. Our study focused on young bees (day 1 after emergence) since (i) few studies are available on locomotion at this stage and (ii) in recent years, pesticides have been reported to accumulate in different hive matrices, where young bees undergo their early development. At sublethal doses (SLD48h, i.e. causing nomortality at 48h), three pyrethroids, namely cypermethrin (2.5 ng/bee), tetramethrin (70 ng/bee), tau-fluvalinate (33 ng/bee) and the neonicotinoid thiamethoxam (3.8 ng/bee) caused a locomotor deficit in honeybees. While the SLD48h of fipronil (a phenylpyrazole, 0.5 ng/bee) had no measurable effect on locomotion, we observed high mortality several days after exposure, an effect that was not observed with the other insecticides. Although locomotor deficits observed in the sublethal range of pyrethroids and thiamethoxam would suggest deleterious effects in the field, the case of fipronil demonstrates that toxicity evaluation requires information onmultiple endpoints (e.g. long term survival) to fully address pesticides risks for honeybees. Pyrethroid- induced locomotor deficits are discussed in light of recent advances regarding their mode of action on honeybee ion channels and current structure-function studies. © 2015 Charreton et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in anymedium, provided the original author and source are credited.
Di Pasquale G.,UMT |
Salignon M.,French National Institute for Agricultural Research |
Le Conte Y.,UMT |
Le Conte Y.,French National Institute for Agricultural Research |
And 10 more authors.
PLoS ONE | Year: 2013
Honey bee colonies are highly dependent upon the availability of floral resources from which they get the nutrients (notably pollen) necessary to their development and survival. However, foraging areas are currently affected by the intensification of agriculture and landscape alteration. Bees are therefore confronted to disparities in time and space of floral resource abundance, type and diversity, which might provide inadequate nutrition and endanger colonies. The beneficial influence of pollen availability on bee health is well-established but whether quality and diversity of pollen diets can modify bee health remains largely unknown. We therefore tested the influence of pollen diet quality (different monofloral pollens) and diversity (polyfloral pollen diet) on the physiology of young nurse bees, which have a distinct nutritional physiology (e.g. hypopharyngeal gland development and vitellogenin level), and on the tolerance to the microsporidian parasite Nosema ceranae by measuring bee survival and the activity of different enzymes potentially involved in bee health and defense response (glutathione-S-transferase (detoxification), phenoloxidase (immunity) and alkaline phosphatase (metabolism)). We found that both nurse bee physiology and the tolerance to the parasite were affected by pollen quality. Pollen diet diversity had no effect on the nurse bee physiology and the survival of healthy bees. However, when parasitized, bees fed with the polyfloral blend lived longer than bees fed with monofloral pollens, excepted for the protein-richest monofloral pollen. Furthermore, the survival was positively correlated to alkaline phosphatase activity in healthy bees and to phenoloxydase activities in infected bees. Our results support the idea that both the quality and diversity (in a specific context) of pollen can shape bee physiology and might help to better understand the influence of agriculture and land-use intensification on bee nutrition and health. © 2013 Di Pasquale et al.
Hashmi M.U.,The University of Lahore |
Shah S.A.,Forman Christian College |
Umer F.,UMT |
Alkedy A.S.,King Abdulaziz University |
Alkedy A.S.,Egypt Atomic Energy Authority
Ceramics - Silikaty | Year: 2013
In this work, powders of the composition (CaO 46- SiO2 34- P2O5 14.5- MgO 4- CaF2 1- MgF2 0.5) (wt. %) were thoroughly mixed and melted in a muffle furnace. The melt was quenched in water to form glass. Three glass-ceramics were prepared by sintering glass samples at three different temperatures 850, 900 and 950°C according to the exothermal peaks of DTA. The DTA peaks correspond to the bioactive crystalline phases hydroxyapatite(HA) and wollastonite as confirmed by the XRD data. Study of diameter-shrinkage co-efficient and bulk-density of samples revealed higher densification rate for the range 900 - 950°C than that for the range 850 - 900°C.SEM and optical microscope results illustrated a tendency towards closely packed structure and increasing grain size with the increase of sintering temperature. The samples were immersed in SBF for 30 days at room temperature for in-vitro evaluation. EDS analysis, showing the presence of carbon(C) along with calcium(Ca) and phosphorus(P) suggests the formation of hydroxycarbonate-apatite(HCA) phase that indicates the bioactivity of the material which increases with the increase of sintering temperature.
Piro C.,UMT |
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2014
The necessity of environmental protection, public health and tourism development is today one of the main priorities in Albania. Even though our country is very rich with water resources due to wide river nets and mountains direction from east to west, their microbiological water quality has been long discussed. Drino and Vjosa are the main rivers in the southern region of Albania and they are shared between Greece and Albania. In Albania, they are under the influence of anthropogenic pollution, which is connected to the untreated urban discharges, waste effluents, agricultural activities etc. The aim of this study is to assess the microbiological water quality of these rivers in Albania based on the seasonal changes of bacterial parameters. Samples are collected every season from Summer 2012 until Winter 2013 - 2014. Seven sampling stations are established along Drino and Vjosa Rivers for this study. Two of these stations are located in the border points, where the rivers come from Greece to Albania. This is done to study whether the water is contaminated in Greece or it is polluted in Albania. The microbiological examination of water samples is made to determine the quantity of Faecal coliforms and Faecal streptococci as indicators of fecal pollution. These indicators are detected via Multiple -Tube Fermentation Technique or Most Probable Numbers (MPN) technique. According to preliminary results, there is a high load of Fc (until 1.2 × 10⁷ bacteria/100ml) and Fs (until 2.3 × 104 bacteria/100ml) in water of five sampling stations, above the rates allowed by European Union for surface waters. While the microbiological quality of water in two stations near the border with Greece is within the rates allowed. The human impact on the microbiological water quality of Drino and Vjosa rivers is more than evident. We will notice that this situation will continue to worsen for as long as urban emissions of all kinds are not handled. Uncontrolled use of such waters could have serious environmental and public health implications especially when water is used for agricultural purposes, aquaculture, swimming etc. © SGEM2014.
Bastide R.,Toulouse 1 University Capitole |
Bardy P.,UMT |
Borrel B.,Center Hospitalier dAlbi |
Boszodi C.,CARMI |
And 8 more authors.
IRBM | Year: 2014
Demographic changes in recent years have contributed to a shift in care models, with the development of homecare as a new alternative to traditional hospitalization. We present a software platform dedicated to the modeling, planning and monitoring of homecare workflows, developed in the framework of the French research program TecSan. The platform is used on the desktop by care coordinators, and on the go by care workers using mobile devices. © 2014 Elsevier Masson SAS.
Nasir M.,UMT |
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2012
This paper proposes a methodology for the long UHV transmission lines distance protection using microprocessor for fault detection, isolation and auto reclosing processes. In the present era, with the development of microprocessor technology, their extra efficient controlling and computing abilities can be utilized in distance relaying for efficient computing of fault distance and the type of fault occurred on the transmission line. Using Symmetrical component theory a single performance equation is developed that will encounter all type of faults on transmission lines regardless of the nature of the fault. Microprocessor will process on these sequence components to estimate the type of fault and the distance of fault from the relay. ETAP is used as a simulation tool to obtain the desired results. Although the formulation described here is independent of hardware yet it provides a complete analytical base for distance protection and is analyzed for different types of fault conditions using simulation tools. © 2012 IEEE.
PubMed | UMT
Type: Journal Article | Journal: PloS one | Year: 2013
Honey bee colonies are highly dependent upon the availability of floral resources from which they get the nutrients (notably pollen) necessary to their development and survival. However, foraging areas are currently affected by the intensification of agriculture and landscape alteration. Bees are therefore confronted to disparities in time and space of floral resource abundance, type and diversity, which might provide inadequate nutrition and endanger colonies. The beneficial influence of pollen availability on bee health is well-established but whether quality and diversity of pollen diets can modify bee health remains largely unknown. We therefore tested the influence of pollen diet quality (different monofloral pollens) and diversity (polyfloral pollen diet) on the physiology of young nurse bees, which have a distinct nutritional physiology (e.g. hypopharyngeal gland development and vitellogenin level), and on the tolerance to the microsporidian parasite Nosemaceranae by measuring bee survival and the activity of different enzymes potentially involved in bee health and defense response (glutathione-S-transferase (detoxification), phenoloxidase (immunity) and alkaline phosphatase (metabolism)). We found that both nurse bee physiology and the tolerance to the parasite were affected by pollen quality. Pollen diet diversity had no effect on the nurse bee physiology and the survival of healthy bees. However, when parasitized, bees fed with the polyfloral blend lived longer than bees fed with monofloral pollens, excepted for the protein-richest monofloral pollen. Furthermore, the survival was positively correlated to alkaline phosphatase activity in healthy bees and to phenoloxydase activities in infected bees. Our results support the idea that both the quality and diversity (in a specific context) of pollen can shape bee physiology and might help to better understand the influence of agriculture and land-use intensification on bee nutrition and health.
News Article | September 14, 2016
Home > Press > SENAI Outfits New Tribology Lab with Bruker UMT TriboLab Systems: Brazils National Service for Industrial Training Invests in Six Bruker Tribometers Abstract: Bruker has announced the installation of six UMT TriboLab Mechanical Testers at the Tribology Laboratory of Innovation SENAI Institute for Surface Engineering in Belo Horizonte, Brazil. Established by Brazils National Service of Industrial Training (SENAI), the new state-of-the-art laboratory will utilize the TriboLab systems to carry out research and development of products focused on the evaluation of materials performance for resistance to wear. The TriboLab systems enable the new laboratory to test real-use conditions across an extremely wide range of industrial products, from automotive engine components and hydraulic pumps to cutting tools and aeronautical turbines. After our purchase of six UMT TriboLab systems we received visitors from large companies who were very interested to learn about our laboratory, said Dr. Karyne Juste, ISI Surface Engineering Researcher at SENAI. They were really impressed with the large number of different tribological tests that we are now able to offer. Working in different market segments, such as mining, automotive, and aeronautical industries, our visitors also emphasized the great relevance of having these services available in Brazil. Bruker was very pleased to help equip such an important tribology laboratory in Brazil, added James Earle, Vice President and General Manager of Brukers Tribology, Stylus and Optical Metrology Business. The TriboLab systems that have been installed allow them to run a comprehensive range of tests, from nanoindentation up to high-load tribology testing under vacuum. SENAI is a very important reference customer, and we look forward to working with Dr. Juste and her team as they support customers throughout South America with advanced tribology testing. About Bruker Corporation For more than 50 years, Bruker has enabled scientists to make breakthrough discoveries and develop new applications that improve the quality of human life. Brukers high-performance, scientific research instruments and high-value analytical solutions enable scientists to explore life and materials at molecular, cellular and microscopic levels. In close cooperation with our customers, Bruker is enabling innovation, productivity and customer success in life science molecular research, in applied and pharma applications, in microscopy, nano-analysis and industrial applications, as well as in cell biology, preclinical imaging, clinical research, microbiology and molecular diagnostics. About UMT TriboLab The UMT was first introduced in 2000 and rapidly became the quasi-standard for tribology and mechanical test labs around the world. With an improved platform offering many new ease-of-use and productivity features, the UMT TriboLaboffers comprehensive TriboScript software package to allow users to intuitively program complex motions and to control applied forces with unprecedented accuracy. Modular environmental chambers can be added or removed in minutes to enable users to adjust temperature or humidity to simulate real-world conditions. Other features include an integrated high-torque motor, built-in analog sensor protection for increased safety, and a comprehensive range of accessories to facilitate a wide range of tribology tests. Only the UMT TriboLab system enables easy and accurate transformation from rotary to reciprocating or linear motion, sub-Newton to kilo-Newton force measurement, or environmental testing from room temperature up to 1000°C. About SENAI The National Service for Industrial Training (Serviço Nacional de Aprendizagem Industrial, SENAI) is responsible for professional and vocational training and also seeks to cultivate international business relationships. With the newly planned research institutes, SENAI intends not just to promote vocational training for industry and business, but also to promote applied research across the country. Currently, SENAI has a total of 26 innovation institutes across nearly all federal states in Brazil, with each institute operating in a specific technical area. The SENAI Institute of Innovation on Surface Engineering offers solutions for increased performance, reliability, competitiveness and quality of products, components and systems by changing their surface properties. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.