WorldWideScience

Sample records for rare plant dictamnus

  1. Dasycarine, a New Quinoline Alkaloid from Dictamnus dasycarpus

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Dasycarine, a new quinoline alkaloid along with five known compounds, dictamine, dihydroobacunone, obacunone, fraxinellone and b -sitosterol, were isolated from Dictamnus dasycarpus. The structure of dasycarine was identified as 4, 5, 8- trimethoxyl -3- (3- methyl -2- butenyl)- 2- quinone by 1D and 2D NMR techniques.

  2. Four new depsides in Origanum dictamnus methanol extract

    NARCIS (Netherlands)

    Exarchou, V.; Takis, P.G.; Malouta, M.; Vervoort, J.; Karali, E.; Troganis, A.N.

    2013-01-01

    We herein describe the identification of four new depsides present in methanol extract of Origanum dictamnus. O. dictamnus’ (dittany) aerial parts methanol extract was subjected to semi-preparative RP-HPLC fractionation followed by identification of individual compounds in each fraction using 1D/2D

  3. Why some plant species are rare.

    Science.gov (United States)

    Wieger Wamelink, G W; Wamelink, G W Weiger; Goedhart, Paul W; Frissel, Joep; Frissel, Josep Y

    2014-01-01

    Biodiversity, including plant species diversity, is threatened worldwide as a result of anthropogenic pressures such as an increase of pollutants and climate change. Rare species in particular are on the verge of becoming extinct. It is still unclear as to why some plant species are rare and others are not. Are they rare due to: intrinsic reasons, dispersal capacity, the effects of management or abiotic circumstances? Habitat preference of rare plant species may play an important role in determining why some species are rare. Based on an extensive data set of soil parameters we investigated if rarity is due to a narrow habitat preference for abiotic soil parameters. For 23 different abiotic soil parameters, of which the most influential were groundwater-table, soil-pH and nutrient-contents, we estimated species responses for common and rare species. Based on the responses per species we calculated the range of occurrence, the range between the 5 and 95 percentile of the response curve giving the habitat preference. Subsequently, we calculated the average response range for common and rare species. In addition, we designed a new graphic in order to provide a better means for presentation of the results. The habitat preferences of rare species for abiotic soil conditions are significantly narrower than for common species. Twenty of the twenty-three abiotic parameters showed on average significantly narrower habitat preferences for rare species than for common species; none of the abiotic parameters showed on average a narrower habitat preference for common species. The results have major implications for the conservation of rare plant species; accordingly management and nature development should be focussed on the maintenance and creation of a broad range of environmental conditions, so that the requirements of rare species are met. The conservation of (abiotic) gradients within ecosystems is particularly important for preserving rare species.

  4. Seasonal and annual variations in the pollination efficiency of a pollinator community of Dictamnus albus L.

    Science.gov (United States)

    Fisogni, A; Rossi, M; Sgolastra, F; Bortolotti, L; Bogo, G; de Manincor, N; Quaranta, M; Galloni, M

    2016-05-01

    The interplay between insect and plant traits outlines the patterns of pollen transfer and the subsequent plant reproductive fitness. We studied the factors that affect the pollination efficiency of a pollinator community of Dictamnus albus L. by evaluating insect behaviour and morphological characteristics in relation to flowering phenology. In order to extrapolate the pollinator importance of single taxa and of the whole pollinator guild, we calculated an index distinguishing between potential (PPI) and realized (RPI) pollinator importance. Although the pollinator species spectrum appeared rather constant, we found high intra- and inter-annual variability of pollinator frequency and importance within the insect community. Flower visitation rate strictly depended on insect abundance and on the overlap between their flying period and flower blooming. All the pollinators visited flowers from the bottom to the top of the racemes, excluding intra-plant geitonogamous pollination, and most of them showed high pollen fidelity. Only medium large-sized bees could contact the upward bending stiles while feeding on nectar, highlighting a specialisation of the plant towards bigger pollinators. Moreover, we found evidence of functional specialisation, since all pollinators were restricted to a single taxonomic group (order: Hymenoptera; superfamily: Apoidea). Both the PPI and RPI indices indicate Habropoda tarsata as the most important pollinator of D. albus. Following hand cross-pollination experiments we revealed the presence of pollination limitation in 1 of the 3 years of field study. We discuss this result in relation to flowering abundance and to possible mismatches of phenological periods between plants and insects. © 2015 German Botanical Society and The Royal Botanical Society of the Netherlands.

  5. Rainfall effects on rare annual plants

    Science.gov (United States)

    Levine, J.M.; McEachern, A.K.; Cowan, C.

    2008-01-01

    Variation in climate is predicted to increase over much of the planet this century. Forecasting species persistence with climate change thus requires understanding of how populations respond to climate variability, and the mechanisms underlying this response. Variable rainfall is well known to drive fluctuations in annual plant populations, yet the degree to which population response is driven by between-year variation in germination cueing, water limitation or competitive suppression is poorly understood.We used demographic monitoring and population models to examine how three seed banking, rare annual plants of the California Channel Islands respond to natural variation in precipitation and their competitive environments. Island plants are particularly threatened by climate change because their current ranges are unlikely to overlap regions that are climatically favourable in the future.Species showed 9 to 100-fold between-year variation in plant density over the 5–12 years of censusing, including a severe drought and a wet El Niño year. During the drought, population sizes were low for all species. However, even in non-drought years, population sizes and per capita growth rates showed considerable temporal variation, variation that was uncorrelated with total rainfall. These population fluctuations were instead correlated with the temperature after the first major storm event of the season, a germination cue for annual plants.Temporal variation in the density of the focal species was uncorrelated with the total vegetative cover in the surrounding community, suggesting that variation in competitive environments does not strongly determine population fluctuations. At the same time, the uncorrelated responses of the focal species and their competitors to environmental variation may favour persistence via the storage effect.Population growth rate analyses suggested differential endangerment of the focal annuals. Elasticity analyses and life table response

  6. Rare and endangered plants in Mount Jinggangshan region

    OpenAIRE

    Lei Wang; Shi Shi; Wenbo Liao; Chunquan Chen; Zhen Li

    2013-01-01

    The occurrence of rare, endangered, and protected plant species is of importance in assessing the status of local biodiversity and the environment as well as developing strategies for nature conservation and management. The abundance and distribution of rare and endangered plants in the Mount Jinggangshan region were investigated as well as the community characteristics of important woody species. The resultsdemonstrate that rare and endangered species have high conservation value and signifi...

  7. Endangered, rare and endemic medicinal plants of the Kopetdag

    OpenAIRE

    AKMURADOV ALLAMURAD; SHAIYMOV BABAGULY; HALMEDOV BAZAR; YAKUBOV ATABEG; HALLIYEVA GULYAIYM

    2016-01-01

    The article presents some information of the place of growing of the endangered, rare and endemic medicinal plants of the Kopetdag. A monitoring has been carried out and the bioecological peculiarities, resource characteristics and modern state of the natural population of the most important species have been studied. Some scientifically based ways of protection and introduction into culture have been worked out to preserve the endangered, rare and endemic medicinal plants of the region.

  8. Determination of rare earth elements in plant protoplasts by MAA

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    A preliminary study on the speciation of rare earth elements in plant cells has been carried out by molecular activation analysis (MAA). Mesophyll protoplasts of Brassica napus were isolated by enzymatic digestion. After being washed with isosmotic solution containing EDTA for several times, the protoplasts were purified by gradient centrifugation. Then the concentration of rare earth elements (REEs) in the protoplasts was determined by neutron activation analysis. The result shows that REEs can enter the cells of the plant.

  9. Review of Studies on Rare Earth against Plant Disease

    Institute of Scientific and Technical Information of China (English)

    慕康国; 张文吉; 崔建宇; 张福锁; 胡林

    2004-01-01

    Agricultural application of rare earth (RE) has been generalized for several decades, and it is involved in crops, vegetables and stock raising in China. However, all the researches on RE mainly focus on the fields such as plant physiological activity, physiological and biochemical mechanism, sanitation toxicology and environmental security. Plant protection by using RE and the induced resistance of plant against diseases were summarized. The mechanism of rare earth against plant disease is highlighted, which includes following two aspects. First, RE elements can control some phytopathogen directly and reduce its virulence to host plant. Another possibility is that RE elements can affect host plant and induce the plant to produce some resistance to disease.

  10. Rare and endangered plants in Mount Jinggangshan region

    Directory of Open Access Journals (Sweden)

    Lei Wang

    2013-03-01

    Full Text Available The occurrence of rare, endangered, and protected plant species is of importance in assessing the status of local biodiversity and the environment as well as developing strategies for nature conservation and management. The abundance and distribution of rare and endangered plants in the Mount Jinggangshan region were investigated as well as the community characteristics of important woody species. The resultsdemonstrate that rare and endangered species have high conservation value and significant importance in systematics and biogeography. This area contains two endangered bryophyte species and 199 species of vascular plants. Among them, 50 species are included in the IUCN Red List of Threatened species, 160 species in the China Species Red List, 49 species in the List of Wild Plants Under State Protection (First Batch, and 90 species in the Appendices of CITES. The variety and abundance of rare and endangered species in this area are equivalent to those for Mount Emei and higher than those for Mount Wuyi and MountTaibai. Many perfectly preserved communities, covering a large area, exist in the Mount Jinggangshan vicinity, and are dominated by rare and endangered species, such as Abies beshanzuensis var. ziyuanensis,Corylus chinensis, Pseudotaxus chienii, Taxus wallichiana var. mairei, Fokienia hodginsii, Amentotaxus argotaenia, Phoebe bournei, Pieris japonica, Rhododendron jinggangshanicum, etc. The communities where some important rare and endangered plants occur are described in detail and suggestions are made for their protection.

  11. A review of fractionations of rare earth elements in plants

    Institute of Scientific and Technical Information of China (English)

    LIANG Tao; DING Shiming; SONG Wenchong; CHONG Zhongyi; ZHANG Chaosheng; LI Haitao

    2008-01-01

    Studies were carried out on several aspects of rare earth elements (REEs), such as the theory and practice of their applications in agriculture, their geochemical behaviors in natural and agricultural ecosystems, the mechanisms for the increase of crop yield using REE fertilizer, and their toxicology. However, limited knowledge was available for the transfer processes and the features and mechanisms of distribution and fractionatious of REEs inside plants. The characteristics of REE fractionations in plants can be used to "trace" the pathway of REE transportation from soils (solution) to plants. A better understanding of the mechanisms of REE fractionations was helpful to investigate the controlling factors, including both the internal and the external ones. The characteristics and mechanisms of REE fractionatious in plants and their significance were reviewed. Furthermore, the prospect for these fields was discussed, in hope of providing a new way in studying the bioavailability of REEs and heavy metals.

  12. Wildlife-friendly farming benefits rare birds, bees and plants.

    Science.gov (United States)

    Pywell, Richard F; Heard, Matthew S; Bradbury, Richard B; Hinsley, Shelley; Nowakowski, Marek; Walker, Kevin J; Bullock, James M

    2012-10-23

    Agricultural intensification is a leading cause of global biodiversity loss, especially for threatened and near-threatened species. One widely implemented response is 'wildlife-friendly farming', involving the close integration of conservation and extensive farming practices within agricultural landscapes. However, the putative benefits from this controversial policy are currently either unknown or thought unlikely to extend to rare and declining species. Here, we show that new, evidence-based approaches to habitat creation on intensively managed farmland in England can achieve large increases in plant, bee and bird species. In particular, we found that habitat enhancement methods designed to provide the requirements of sensitive target biota consistently increased the richness and abundance of both rare and common species, with 10-fold to greater than 100-fold more rare species per sample area than generalized conventional conservation measures. Furthermore, targeting landscapes of high species richness amplified beneficial effects on the least mobile taxa: plants and bees. Our results provide the first unequivocal support for a national wildlife-friendly farming policy and suggest that this approach should be implemented much more extensively to address global biodiversity loss. However, to be effective, these conservation measures must be evidence-based, and developed using sound knowledge of the ecological requirements of key species.

  13. Revisiting the plant hyperaccumulation criteria to rare plants and earth abundant elements

    Energy Technology Data Exchange (ETDEWEB)

    Branquinho, Cristina [Universidade de Lisboa, Faculdade de Ciencias, Centro de Ecologia e Biologia Vegetal, Campo Grande C2, Piso 4, 1749-016 Lisbon (Portugal) and Universidade Atlantica, Antiga Fabrica da Polvora de Barcarena, 2745-615 Barcarena (Portugal)]. E-mail: cmbranquinho@fc.ul.pt; Serrano, Helena Cristina [Universidade de Lisboa, Museu Nacional de Historia Natural, Jardim Botanico (Portugal); Pinto, Manuel Joao [Universidade de Lisboa, Museu Nacional de Historia Natural, Jardim Botanico (Portugal); Martins-Loucao, Maria Amelia [Universidade de Lisboa, Faculdade de Ciencias, Centro de Ecologia e Biologia Vegetal, Campo Grande C2, Piso 4, 1749-016 Lisbon (Portugal); Universidade de Lisboa, Museu Nacional de Historia Natural, Jardim Botanico (Portugal)

    2007-03-15

    The several established criteria to define a hyperaccumulator plant were applied to a rare and endangered species, Plantago almogravensis, and to the 3rd most abundant element in the earth crust, Al. Using the most common criteria, P. almogravensis undoubtedly is an Al hyperaccumulator plant. If the recent proposed requirements were considered, most of them matching those for a plant to be used in phytoextraction, it can only be considered an unusual accumulator of Al. A discussion is made concerning the several criteria of a hyperaccumulator plant in order to include rare and endemic ones and abundant elements. In ecological terms, the enrichment in Al and Fe observed may account for the differences in the vegetation pattern. Due to the rarity and endangered nature of this plant, the contribution of this work is also relevant for the ecological understanding and the development of conservation options of this endemic species. - Revisiting plant hyperaccumulation criteria.

  14. Population and community ecology of the rare plant amsinckia grandiflora

    Energy Technology Data Exchange (ETDEWEB)

    Carlsen, T.M.

    1996-11-01

    Research was conducted between the fall of 1992 and the spring on the population and community ecology of the rare annual plant, Amsinckia glandiflora (Gray) Kleeb. ex Greene (Boraginaceae). The research goal was to investigate the causes of the species rarity, data useful to restorative efforts. The work focused on the examination of competitive suppression by exotic annual grasses; comparisons with common, weedy congener; and the role of litter cover and seed germination and seedling establishment. Annual exotic grasses reduced A. grandiflora reproductive output to a greater extent than did the native perennial bunch grass.

  15. Conservation investment for rare plants in urban environments.

    Directory of Open Access Journals (Sweden)

    Mark W Schwartz

    Full Text Available Budgets for species conservation limit actions. Expending resources in areas of high human density is costly and generally considered less likely to succeed. Yet, coastal California contains both a large fraction of narrowly endemic at-risk plant species as well as the state's three largest metropolitan regions. Hence understanding the capacity to protect species along the highly urbanized coast is a conservation priority. We examine at-risk plant populations along California's coastline from San Diego to north of San Francisco to better understand whether there is a relationship between human population density and: i performance of at-risk plant populations; and ii conservation spending. Answering these questions can help focus appropriate strategic conservation investment. Rare plant performance was measured using the annualized growth rate estimate between census periods using the California Natural Diversity Database. Human density was estimated using Census Bureau statistics from the year 2000. We found strong evidence for a lack of a relationship between human population density and plant population performance in California's coastal counties. Analyzing US Endangered Species expenditure reports, we found large differences in expenditures among counties, with plants in San Diego County receiving much higher expenditures than other locations. We found a slight positive relationship between expenditures on behalf of endangered species and human density. Together these data support the argument that conservation efforts by protecting habitats within urban environments are not less likely to be successful than in rural areas. Expenditures on behalf of federally listed endangered and threatened plants do not appear to be related to proximity to human populations. Given the evidence of sufficient performance in urban environments, along with a high potential to leverage public support for nature in urban environments, expenditures in these

  16. Review: Biotechnological strategies for conservation of rare and endangered medicinal plants

    OpenAIRE

    MAHENDRA KUMAR RAI

    2010-01-01

    Rai MK (2010) Review: Biotechnological strategies for conservation of rare and endangered medicinal plants. Biodiversitas 11: 157-166. The use of medicinal plants is as old as human civilization. The biotechnological tools play a crucial role in conservation of rare and endangered medicinal plants. The rapid depletion of plant genetic diversity has made essential to develop new in situ and ex situ conservation methods. Advances in biotechnology offer new methods for conservation of rare and...

  17. Pollinator networks, alien species and the conservation of rare plants: Trinia glauca as a case study

    NARCIS (Netherlands)

    Carvalheiro, L.G.; Barbosa, E.R.; Memmott, J.

    2008-01-01

    1. Despite the essential role of pollination in the maintenance of many rare plant species, conservation management plans rarely consider the service of pollination. 2. This study identifies the main pollinators of a rare English plant species, Trinia glauca (Apiaceae), and provides recommendations

  18. Pollinator networks, alien species and the conservation of rare plants: Trinia glauca as a case study

    NARCIS (Netherlands)

    Carvalheiro, L.G.; Barbosa, E.R.; Memmott, J.

    2008-01-01

    1. Despite the essential role of pollination in the maintenance of many rare plant species, conservation management plans rarely consider the service of pollination. 2. This study identifies the main pollinators of a rare English plant species, Trinia glauca (Apiaceae), and provides recommendations

  19. 7 CFR 650.22 - Rare, threatened, and endangered species of plants and animals.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 6 2010-01-01 2010-01-01 false Rare, threatened, and endangered species of plants and... Related Environmental Concerns § 650.22 Rare, threatened, and endangered species of plants and animals. (a) Background. (1) A variety of plant and animal species of the United States are so reduced in numbers...

  20. Origanum dictamnus Oil Vapour Suppresses the Development of Grey Mould in Eggplant Fruit In Vitro

    Directory of Open Access Journals (Sweden)

    Andriana Stavropoulou

    2014-01-01

    Full Text Available Grey mould rot (Botrytis cinerea development in vitro or in eggplant (Solanum melongena L. fruit was evaluated after treatment with dittany (Origanum dictamnus L. oil (DIT and storage at 12°C and 95% relative humidity during or following exposure to the volatiles. DIT volatiles used in different concentration (0-50-100-250 μL/L and times of exposure (up to 120 h examined the effects on pathogen development as well as fruit quality parameters. In vitro, fungal colony growth was inhibited with the application of DIT oil (during or after exposure and/or time of application. Continuous exposure to oils reduced conidial germination and production with fungistatic effects observed in 250 μL/L. In vivo, fungal lesion growth and conidial production reduced in DIT-treated fruits. Interesting, in fruits preexposed to volatiles before fungal inoculation, DIT application induced fruit resistance against the pathogen, by reduced lesion growth and conidial production. Conidial viability reduced in >100 μL/L DIT oil. Fruits exposed to essential oil did not affect fruit quality related attributes in general, while skin lightness (L value increased in 50 and 100 μL/L DIT oil. The results of the current study indicated that dittany volatiles may be considered as an alternative food preservative, eliminating disease spread in the storage/transit atmospheres.

  1. Do competitors modulate rare plant response to precipitation change?

    Science.gov (United States)

    Levine, Jonathan M; McEachern, A Kathryn; Cowan, Clark

    2010-01-01

    Ecologists increasingly suspect that climate change will directly impact species physiology, demography, and phenology, but also indirectly affect these measures via changes to the surrounding community. Unfortunately, few studies examine both the direct and indirect pathways of impact. Doing so is important because altered competitive pressures can reduce or magnify the direct responses of a focal species to climate change. Here, we examine the effects of changing rainfall on three rare annual plant species in the presence and absence of competition on the California Channel Islands. We used rain-out shelters and hand watering to exclude and augment early, late, and season-long rainfall, spanning the wide range of precipitation change forecast for the region. In the absence of competition, droughts reduced the population growth rates of two of three focal annuals, while increased rainfall was only sometimes beneficial. As compared to the focal species, the dominant competitors were more sensitive to the precipitation treatments, benefiting from increased season-long precipitation and harmed by droughts. Importantly, the response of two of three competitors to the precipitation treatments tended to be positively correlated with those of the focal annuals. Although this leads to the expectation that increased competition will counter the direct benefits of favorable conditions, such indirect effects of precipitation change proved weak to nonexistent in our experiment. Competitors had little influence on the precipitation response of two focal species, due to their low sensitivity to competition and highly variable precipitation responses. Competition did affect how our third focal species responded to precipitation change, but this effect only approached significance, and whether it truly resulted from competitor response to precipitation change was unclear. Our work suggests that even when competitors respond to climate change, these responses may have little

  2. Do competitors modulate rare plant response to precipitation change?

    Science.gov (United States)

    Levine, J.M.; Kathryn, Mceachern A.; Cowan, C.

    2010-01-01

    Ecologists increasingly suspect that climate change will directly impact species physiology, demography, and phenology, but also indirectly affect these measures via changes to the surrounding community. Unfortunately, few studies examine both the direct and indirect pathways of impact. Doing so is important because altered competitive pressures can reduce or magnify the direct responses of a focal species to climate change. Here, we examine the effects of changing rainfall on three rare annual plant species in the presence and absence of competition on the California Channel Islands. We used rain-out shelters and hand watering to exclude and augment early, late, and season-long rainfall, spanning the wide range of precipitation change forecast for the region. In the absence of competition, droughts reduced the population growth rates of two of three focal annuals, while increased rainfall was only sometimes beneficial, As compared to the focal species, the dominant competitors were more sensitive to the precipitation treatments, benefiting from increased season-long precipitation and harmed by droughts. Importantly, the response of two of three competitors to the precipitation treatments tended to be positively correlated with those of the focal annuals. Although this leads to the expectation that increased competition will counter the direct benefits of favorable conditions, such indirect effects of precipitation change proved weak to nonexistent in our experiment. Competitors had little influence on the precipitation response of two focal species, due to their low sensitivity to competition and highly variable precipitation responses. Competition did affect how our third focal species responded to precipitation change, but this effect only approached significance, and whether it truly resulted from competitor response to precipitation change was unclear. Our work suggests that even when competitors respond to climate change, these responses may have little

  3. Evaluation of the Antimicrobial and Antioxidant Activities of Origanum dictamnus Extracts before and after Encapsulation in Liposomes

    Directory of Open Access Journals (Sweden)

    John Tsaknis

    2007-05-01

    Full Text Available The antioxidant and antimicrobial activity of methanol or dichloromethane extracts of O. dictamnus, produced from wild and organic cultivated specimens, were determined. The Rancimat and malondialdehyde (MDA by HPLC methods were used to measure the antioxidant action, in comparison with that of the common commercial antioxidants butylated hydroxytoluene (BHT and α-tocopherol. The extracts that presented high antioxidant activity were encapsulated in liposomes and their antioxidant action was again estimated using differential scanning calorimetry (DSC. Thermaloxidative decomposition of the samples (pure liposomes and encapsulated extracts and the modification of the main transition temperature for the lipid mixture and the splitting of the calorimetric peak in the presence of the antioxidants were also studied by the DSC method. All extracts showed antioxidant and antimicrobial activities. Their action proved superior to α-tocopherol. The methanol extract of organic cultivated O. dictamnus (240 ppm showed higher activity than butylated hydroxytoluene. After encapsulation in liposomes the antioxidant as well as antimicrobial activities proved to be higher than those of the same extracts in pure form.

  4. Review: Biotechnological strategies for conservation of rare and endangered medicinal plants

    Directory of Open Access Journals (Sweden)

    MAHENDRA KUMAR RAI

    2010-07-01

    Full Text Available Rai MK (2010 Review: Biotechnological strategies for conservation of rare and endangered medicinal plants. Biodiversitas 11: 157-166. The use of medicinal plants is as old as human civilization. The biotechnological tools play a crucial role in conservation of rare and endangered medicinal plants. The rapid depletion of plant genetic diversity has made essential to develop new in situ and ex situ conservation methods. Advances in biotechnology offer new methods for conservation of rare and endangered medicinal plants. The present review is focused on biotechnological tools like in vitro culture, micropropagation, mycorrhization, genetic transformation and development of DNA banks. These are imperative and important alternatives for the conservation of rare and endangered medicinal plants.

  5. Conservation state of populations of rare plant species in highly transformed meadow steppes of Southern Opillya

    Directory of Open Access Journals (Sweden)

    I. I. Dmytrash-Vatseba

    2016-09-01

    Full Text Available Degradation of natural habitats causes rapid extinction of rare plant populations. The diversity of rare plant species in the meadow steppes of Southern Opillya (Western Ukraine depends strongly on patch area, pasture digression of vegetation and a variety of eco-coenotical conditions. The main threats for the rare components of the meadow steppe flora are reduction of habitat and overgrazing. Spatial connections between sites are unable to support a constant rare plant population. The analysis of the composition of rare plant meadow-steppe species indicated that habitats with similar rare species composition usually have similar parameters of area, stages of pasture digression and eco-coenotical conditions. Spatial connectivity of patches does not ensure species similarity of rare components of the flora. Rare plant species were grouped according to their preferences for habitat , area and condition. In small patches subject to any stage of pasture digression grow populations of Adonis vernalis L., Pulsatilla patens (L. Mill., P. grandis Wender., Stipa capillata L., S. рennata L., Chamaecytisus blockianus (Pawł. Klásková etc. On the contrary, populations of other species (Carlina onopordifolia Besser. ex Szafer., Kuecz. et Pawł., Adenophora liliifolia (L. Ledeb. ex A. DC., Crambe tataria Sebeók, Euphorbia volhynica Besser ex Racib., Stipa tirsa Stev. etc. prefer large habitats, not changed by pasture digression. Prevention of reduction of rare species diversity requires preservation (also extension of patch area and regulation of grazing intensity.

  6. Ontogenetic shifts in plant-plant interactions in a rare cycad within angiosperm communities.

    Science.gov (United States)

    Álvarez-Yépiz, Juan C; Búrquez, Alberto; Dovčiak, Martin

    2014-06-01

    Gymnosperms and angiosperms can co-occur within the same habitats but key plant traits are thought to give angiosperms an evolutionary competitive advantage in many ecological settings. We studied ontogenetic changes in competitive and facilitative interactions between a rare gymnosperm (Dioon sonorense, our target species) and different plant and abiotic neighbours (conspecific-cycads, heterospecific-angiosperms, or abiotic-rocks) from 2007 to 2010 in an arid environment of northwestern Mexico. We monitored survival and growth of seedlings, juveniles, and adults of the cycad Dioon sonorense to evaluate how cycad survival and relative height growth rate (RHGR) responded to intra- and interspecific competition, canopy openness, and nearest neighbour. We tested spatial associations among D. sonorense life stages and angiosperm species and measured ontogenetic shifts in cycad shade tolerance. Canopy openness decreased cycad survival while intraspecific competition decreased survival and RHGR during early ontogeny. Seedling survival was higher in association with rocks and heterospecific neighbours where intraspecific competition was lower. Shade tolerance decreased with cycad ontogeny reflecting the spatial association of advanced stages with more open canopies. Interspecific facilitation during early ontogeny of our target species may promote its persistence in spite of increasing interspecific competition in later stages. We provide empirical support to the long-standing assumption that marginal rocky habitats serve as refugia from angiosperm competition for slow-growing gymnosperms such as cycads. The lack of knowledge of plant-plant interactions in rare or endangered species may hinder developing efficient conservation strategies (e.g. managing for sustained canopy cover), especially under the ongoing land use and climatic changes.

  7. Rare and endangered plant species of the Chinese Altai Mountains

    Institute of Scientific and Technical Information of China (English)

    Marina; V.OLONOVA

    2010-01-01

    Altai (also named Altay in China) Mountain Country (Mountain System) is a unique natural region,located on the border between different floristic regimes of the Boreal and ancient Mediterranean sub-kingdoms,where distribution of plant species is actually limited. It is known to have sufficient endemic floral biodiversity in the Northern Asia. Many plants of Altai Mountain System need effective care and proper conservation measures for their survival and longer-term protection. Important Plant Area identified as the IUCN (the International Union for Conservation of Nature),specified criteria attract global attention for protection of floral biodiversity across the world. The records of 71 plant species from the Chinese Altai Mountains attributed to the criterion A and the dark conifer forests of Chinese Altai Mountains satisfied the criterion C,which may help qualify to fulfill the national obligation of the Convention on Biological Diversity.

  8. Effect of phosphorus concentration of the nutrient solution on the volatile constituents of leaves and bracts of Origanum dictamnus.

    Science.gov (United States)

    Economakis, C; Skaltsa, Helen; Demetzos, Costas; Soković, M; Thanos, Costas A

    2002-10-23

    The chemical composition of the essential oils obtained from the leaves and bracts of hydroponically cultivated Origanum dictamnus were analyzed by GC-MS techniques. Three different concentrations of phosphorus (5, 30, and 60 mg/L) in the nutrient solution were used for the cultivation, using the nutrient film technique (NFT). A total of 46 different compounds were identified and significant differences (qualitative and quantitative) were observed between the samples. Carvacrol and p-cymene were identified as the main compounds in all samples analyzed, whereas thymoquinone was found in higher percentage in the leaves than in bracts. The essential oils were tested for their antibacterial activity against Gram-positive and Gram-negative bacteria. The oils obtained from the bracts were found to be more active. The results obtained from GC-MS analyses were submitted to chemometric analysis.

  9. Distribution patterns of rare earth elements in various plant species

    Energy Technology Data Exchange (ETDEWEB)

    Wyttenbach, A.; Tobler, L.; Furrer, V. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)

    1997-09-01

    The elements La, Ce, Nd, Sm, Eu, Gd, Tb, Yb and Lu have been determined in 6 different plant species by neutron activation analysis. When the concentrations of each species were normalized to Norway spruce, smooth curves were obtained which revealed systematic inter-species differences. (author) 3 figs., 4 refs.

  10. Rare and Endangered Geophyte Plant Species in Serpentine of Kosovo

    Directory of Open Access Journals (Sweden)

    Naim Berisha

    2014-12-01

    Full Text Available Our study documents information on rarity, geographical distribution, taxonomy and conservation status of 11 geophyte species in serpentine soils of Kosovo, already included in the Red Book of Vascular Flora of Kosovo. Kosovo’s serpentine vegetation represents a diversity that yet has not been sufficiently explored. Large serpentine complexes are found in the northern Kosovo but also southern part of the country is rich in serpentines, therefore in endemics. Serpentine rocks and soils are characterized by low level of principal plant nutrients (N, P, K, Ca and exceptionally high levels of Mg and Fe. Serpentines play particular importance for flora of the country due to their richness in endemic plant species. The following 11 plant species have been studied: Aristolochia merxmuelleri, Colchicum hungaricum, Crocus flavus, Crocus kosaninii, Epimedium alpinum, Gentiana punctata, Gladiolus illyricus, Lilium albanicum, Paeonia peregrina, Tulipa gesneriana and Tulipa kosovarica. Five out of eleven studied geophytes fall within Critically Endangered IUCN based threat category and five out of eleven are local endemics. Aristolochia merxmuelleri and Tulipa kosovarica are steno-endemic plant species that are found exclusively in serpentine soils. Information in our database should prove to be valuable to efforts in ecology, floristics, biosystematics, conservation and land management.

  11. Advances in the reintroduction of rare and endangered wild plant species.

    Science.gov (United States)

    Ren, Hai; Jian, ShuGuang; Liu, HongXiao; Zhang, QianMei; Lu, HongFang

    2014-06-01

    Human disturbance and climate change have increased the risk of extinction for rare and endangered wild plant species. One effective way to conserve these rare and endangered species is through reintroduction. In this review, we summarize the advances in wild plant reintroduction from five perspectives: the establishment of reintroduction biology as an important tool for biodiversity conservation; the importance of genetic diversity in reintroduction; reintroduction under global climate change; recruitment limitation in reintroduction; and reintroduction and ecological restoration. In addition, we consider the future of plant reintroduction strategies.

  12. Rare and endangered species of plants--the soviet side.

    Science.gov (United States)

    Elias, T S

    1983-01-07

    In late 1972, the Soviet Union embarked on a program to identify and document plant species that are threatened with extinction. Perhaps 2000 species in the Soviet Union are in need of monitoring or protective measures, while nearly 200 may be in immediate danger of extinction. Currently, the Soviet Union has an official, national list of endangered species, and each of the 15 republics has prepared a regional list. Once a revised national list is prepared, Soviet scientists hope that the Supreme Soviet will pass a law protecting those species. A corresponding law for endangered animals was passed in 1980.

  13. A comparison of the herbicide tolerances of rare and common plants in an agricultural landscape.

    Science.gov (United States)

    Egan, J Franklin; Graham, Ian M; Mortensen, David A

    2014-03-01

    Declining plant biodiversity in agroecosystems has often been attributed to escalating use of chemical herbicides, but other changes in farming systems, including the clearing of seminatural habitat fragments, confound the influence of herbicides. The present study introduces a new approach to evaluate the impacts of herbicide pollution on plant communities at landscape or regional scales. If herbicides are in fact a key factor shaping agricultural plant diversity, one would expect to see the signal of past herbicide impacts in the current plant community composition of an intensively farmed region, with common, successful species more tolerant to widely used herbicides than rare or declining species. Data from an extensive field survey of plant diversity in Lancaster County, Pennsylvania, USA, were compared with herbicide bioassay experiments in a greenhouse to test the hypothesis that common species possess higher herbicide tolerances than rare species. Five congeneric pairs of rare and common species were treated with 3 commonly used herbicide modes of action in bioassay experiments, and few significant differences were found in the tolerances of rare species relative to common species. These preliminary results suggest that other factors beyond herbicide exposure may be more important in shaping the distribution and abundance of plant species diversity across an agricultural landscape.

  14. Hanford Site Rare Plant Monitoring Report for Calendar Year 2012

    Energy Technology Data Exchange (ETDEWEB)

    Salstrom, D; Easterly, R; Lindsey, Cole T.; Nugent, John J.

    2013-03-21

    Two patches of Columbian yellowcress on the Hanford Reach were visited in both 2011 and 2012 to compare ramet counts between years: near Allerd Pumphouse (Rkm 615.4) and near White Bluffs Boat Launch (Rkm 593.3) (Figure 3). In 2012, the population near Allerd Pumphouse had 45 ramets present within a 5x3 m area. At the same population in 2011, there were 60 ramets. In 2012, the population near White Bluffs Boat Launch had 105 ramets in a 2x2 m area. At the same population in 2011, there were 100 ramets. This data shows that while annual variability does exist, ramet counts were relatively similar from 2011 to 2012. This is likely due to the similar flow regimes of 2011 and 2012, which both had above average snowpack, high flows, and extended spring flooding seasons. A total of 19.6 miles (31.5 km) of the Hanford shoreline were surveyed in 2012, with ten patches identified and approximately 1,250 ramets counted. It is not known how many individual plants this count represents due to the rhizomatous nature of the species. Two of these sites were identified previously in the WNHP database, and the remaining eight were newly identified locations. Eleven of the ramets had flowers and/or buds in the patches located during 2012, but no fruits were found

  15. [The application of DNA molecular markers in conservation of the rare and endangered medicinal plants].

    Science.gov (United States)

    Yan, Zhi-Feng; Zhang, Ben-Gang; Zhang, Zhao; Xia, Tian-Rui

    2005-12-01

    In this paper, the advance in DNA molecular markers techniques in recent years was reviewed. The application of DNA markers in conservation of the rare and endangered medicinal plants was explicated, of which included identification of germ-plasm resource, determination of the habitats unite which should be protected in situ, sampling strategies of ex-situ conservation, evaluation of the conservation effects of the rare and endangered medicinal plants, as well as elucidation of their endangered mechanism etc. The information could help drawing up conservation strategies and conservation measures for references.

  16. Biotechnological approaches for conservation and improvement of rare and endangered plants of Saudi Arabia.

    Science.gov (United States)

    Khan, Salim; Al-Qurainy, Fahad; Nadeem, Mohammad

    2012-01-01

    Genetic variation is believed to be a prerequisite for the short-and long-term survival of the plant species in their natural habitat. It depends on many environmental factors which determine the number of alleles on various loci in the genome. Therefore, it is important to understand the genetic composition and structure of the rare and endangered plant species from their natural habitat to develop successful management strategies for their conservation. However, rare and endangered plant species have low genetic diversity due to which their survival rate is decreasing in the wilds. The evaluation of genetic diversity of such species is very important for their conservation and gene manipulation. However, plant species can be conserved by in situ and in vitro methods and each has advantages and disadvantages. DNA banking can be considered as a means of complimentary method for the conservation of plant species by preserving their genomic DNA at low temperatures. Such approach of preservation of biological information provides opportunity for researchers to search novel genes and its products. Therefore, in this review we are describing some potential biotechnological approaches for the conservation and further manipulation of these rare and endangered plant species to enhance their yield and quality traits.

  17. Effects of rare earth elements and REE-binding proteins on physiological responses in plants.

    Science.gov (United States)

    Liu, Dongwu; Wang, Xue; Chen, Zhiwei

    2012-02-01

    Rare earth elements (REEs), which include 17 elements in the periodic table, share chemical properties related to a similar external electronic configuration. REEs enriched fertilizers have been used in China since the 1980s. REEs could enter the cell and cell organelles, influence plant growth, and mainly be bound with the biological macromolecules. REE-binding proteins have been found in some plants. In addition, the chlorophyll activities and photosynthetic rate can be regulated by REEs. REEs could promote the protective function of cell membrane and enhance the plant resistance capability to stress produced by environmental factors, and affect the plant physiological mechanism by regulating the Ca²⁺ level in the plant cells. The focus of present review is to describe how REEs and REE-binding proteins participate in the physiological responses in plants.

  18. Generalist birds promote tropical forest regeneration and increase plant diversity via rare-biased seed dispersal.

    Science.gov (United States)

    Carlo, Tomás A; Morales, Juan M

    2016-07-01

    Regenerated forests now compose over half of the world's tropical forest cover and are increasingly important as providers of ecosystem services, freshwater, and biodiversity conservation. Much of the value and functionality of regenerating forests depends on the plant diversity they contain. Tropical forest diversity is strongly shaped by mutualistic interactions between plants and fruit-eating animals (frugivores) that disperse seeds. Here we show how seed dispersal by birds can influence the speed and diversity of early successional forests in Puerto Rico. For two years, we monitored the monthly fruit production of bird-dispersed plants on a fragmented landscape, and measured seed dispersal activity of birds and plant establishment in experimental plots located in deforested areas. Two predominantly omnivorous bird species, the Northern Mockingbird (Mimus polyglottos) and the Gray Kingbird (Tyrannus dominicensis), proved critical for speeding up the establishment of woody plants and increasing the species richness and diversity of the seed rain in deforested areas. Seed dispersal by these generalists increased the odds for rare plant species to disperse and establish in experimental forest-regeneration plots. Results indicate that birds that mix fruit and insects in their diets and actively forage across open and forested habitats can play keystone roles in the regeneration of mutualistic plant-animal communities. Furthermore, our analyses reveal that rare-biased (antiapostatic) frugivory and seed dispersal is the mechanism responsible for increasing plant diversity in the early-regenerating community. © 2016 by the Ecological Society of America.

  19. Response of smooth rock skullcap (Scutellaria saxatilis), a globally rare plant, to fire

    Science.gov (United States)

    Cynthia D. Huebner; Kent. Karriker

    2015-01-01

    Scutellaria saxatilis Riddell (smooth rock skullcap or rock skullcap, hereafter abbreviated as SRS), a herbaceous perennial in the mint family, is a globally rare (G3) plant. In West Virginia, SRS is categorized as an S2 species (imperiled and at high risk of extinction due to a very restricted range, very few [

  20. Rare Plants and Animals of the Texas Hill Country: Educator's Guide.

    Science.gov (United States)

    Texas State Dept. of Parks and Wildlife, Austin.

    Texas Hill Country is a land of fresh water springs, stony hills, and steep canyons and home to many rare plants and animals. Six activities for grades 3-5 and six activities for grades 6-12 are contained in this guide. Elementary activity highlights include using "The Lorax" by Dr. Seuss to stimulate critical thinking about environmental problems…

  1. From Agrobacterium to viral vectors: genome modification of plant cells by rare cutting restriction enzymes.

    Science.gov (United States)

    Marton, Ira; Honig, Arik; Omid, Ayelet; De Costa, Noam; Marhevka, Elena; Cohen, Barry; Zuker, Amir; Vainstein, Alexander

    2013-01-01

    Researchers and biotechnologists require methods to accurately modify the genome of higher eukaryotic cells. Such modifications include, but are not limited to, site-specific mutagenesis, site-specific insertion of foreign DNA, and replacement and deletion of native sequences. Accurate genome modifications in plant species have been rather limited, with only a handful of plant species and genes being modified through the use of early genome-editing techniques. The development of rare-cutting restriction enzymes as a tool for the induction of site-specific genomic double-strand breaks and their introduction as a reliable tool for genome modification in animals, animal cells and human cell lines have paved the way for the adaptation of rare-cutting restriction enzymes to genome editing in plant cells. Indeed, the number of plant species and genes which have been successfully edited using zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs) and engineered homing endonucleases is on the rise. In our review, we discuss the basics of rare-cutting restriction enzyme-mediated genome-editing technology with an emphasis on its application in plant species.

  2. Quantitative Assessment on Endangerment Degree of Rare Animal and Plant Species in Tibet, China

    Institute of Scientific and Technical Information of China (English)

    DONG Ke; ZHONG Xianghao; LIU Shuzhen

    2007-01-01

    It is of profound theoretical and practical significance to study endangerment status of rare species in Tibet. Index system is firstly set down for quantitative assessment of rare animal and plant species, then endangerment degree of wildlife under special state protection are calculated, which is expressed by value E. The results reveal that Yunnan snub-nosed monkey (Rhinopithecus bieti), Himalayan tahr (Hemitragus jemlahicus) and Gigantic Cypress (Cupressus gigantea) have the highest E respectively in animals and plants. According to value E, all species are categorized into 4 ranks: critically endangered(0.6-0.8), endangered (0.4-0.6), vulnerable (0.2-0.4) and lower risk (E≤ 0.2). By comparison of the first five animals and plants of the highest E, each sub-ecozone bears a distinct identity.

  3. Context dependency and saturating effects of loss of rare soil microbes on plant productivity

    Directory of Open Access Journals (Sweden)

    Gera eHol

    2015-06-01

    Full Text Available Land use intensification is associated with loss of biodiversity and altered ecosystem functioning. Until now most studies on the relationship between biodiversity and ecosystem functioning focused on random loss of species, while loss of rare species that usually are the first to disappear received less attention. Here we test if the effect of rare microbial species loss on plant productivity depends on the origin of the microbial soil community. Soils were sampled from three land use types at two farms. Microbial communities with increasing loss of rare species were created by inoculating sterilized soils with serially diluted soil suspensions. After 8 months of incubation, the effects of the different soil communities on abiotic soil properties, soil processes, microbial community composition and plant productivity was measured. Dilution treatments resulted in increasing species loss, which was in relation to abundance of bacteria in the original field soil, without affecting most of the other soil parameters and processes. Microbial species loss affected plant biomass positively, negatively or not at all, depending on soil origin, but not on land use history. Even within fields the effects of dilution on plant biomass varied between replicates, suggesting heterogeneity in microbial community composition. The effects of medium and severe species loss on plant biomass were similar, pointing towards a saturating effect of species loss. We conclude that changes in the composition of the soil microbial community, including rare species loss, can affect plant productivity, depending on the composition of the initial microbial community. Future work on the relation between function and species loss effects should address this variation by including multiple sampling origins.

  4. Context dependency and saturating effects of loss of rare soil microbes on plant productivity.

    Science.gov (United States)

    Hol, W H Gera; de Boer, Wietse; de Hollander, Mattias; Kuramae, Eiko E; Meisner, Annelein; van der Putten, Wim H

    2015-01-01

    Land use intensification is associated with loss of biodiversity and altered ecosystem functioning. Until now most studies on the relationship between biodiversity and ecosystem functioning focused on random loss of species, while loss of rare species that usually are the first to disappear received less attention. Here we test if the effect of rare microbial species loss on plant productivity depends on the origin of the microbial soil community. Soils were sampled from three land use types at two farms. Microbial communities with increasing loss of rare species were created by inoculating sterilized soils with serially diluted soil suspensions. After 8 months of incubation, the effects of the different soil communities on abiotic soil properties, soil processes, microbial community composition, and plant productivity was measured. Dilution treatments resulted in increasing species loss, which was in relation to abundance of bacteria in the original field soil, without affecting most of the other soil parameters and processes. Microbial species loss affected plant biomass positively, negatively or not at all, depending on soil origin, but not on land use history. Even within fields the effects of dilution on plant biomass varied between replicates, suggesting heterogeneity in microbial community composition. The effects of medium and severe species loss on plant biomass were similar, pointing toward a saturating effect of species loss. We conclude that changes in the composition of the soil microbial community, including rare species loss, can affect plant productivity, depending on the composition of the initial microbial community. Future work on the relation between function and species loss effects should address this variation by including multiple sampling origins.

  5. Phylogenomic analysis demonstrates a pattern of rare and ancient horizontal gene transfer between plants and fungi.

    Science.gov (United States)

    Richards, Thomas A; Soanes, Darren M; Foster, Peter G; Leonard, Guy; Thornton, Christopher R; Talbot, Nicholas J

    2009-07-01

    Horizontal gene transfer (HGT) describes the transmission of genetic material across species boundaries and is an important evolutionary phenomenon in the ancestry of many microbes. The role of HGT in plant evolutionary history is, however, largely unexplored. Here, we compare the genomes of six plant species with those of 159 prokaryotic and eukaryotic species and identify 1689 genes that show the highest similarity to corresponding genes from fungi. We constructed a phylogeny for all 1689 genes identified and all homolog groups available from the rice (Oryza sativa) genome (3177 gene families) and used these to define 14 candidate plant-fungi HGT events. Comprehensive phylogenetic analyses of these 14 data sets, using methods that account for site rate heterogeneity, demonstrated support for nine HGT events, demonstrating an infrequent pattern of HGT between plants and fungi. Five HGTs were fungi-to-plant transfers and four were plant-to-fungi HGTs. None of the fungal-to-plant HGTs involved angiosperm recipients. These results alter the current view of organismal barriers to HGT, suggesting that phagotrophy, the consumption of a whole cell by another, is not necessarily a prerequisite for HGT between eukaryotes. Putative functional annotation of the HGT candidate genes suggests that two fungi-to-plant transfers have added phenotypes important for life in a soil environment. Our study suggests that genetic exchange between plants and fungi is exceedingly rare, particularly among the angiosperms, but has occurred during their evolutionary history and added important metabolic traits to plant lineages.

  6. Floristic Characteristics of the Rare and Endangered Plants and the Conservation Countermeasures in Tibet, China

    Institute of Scientific and Technical Information of China (English)

    ZHU Wan-ze; LI Mai-he; ZHANG Jun-yan; FAN Ji-hui; FAN Jian-rong

    2005-01-01

    The floristic elements and the geographical distribution are analyzed in this paper based on statistics of elements of rare and endangered plants in Tibet. The results have been gained as following: ① According to "the National Important Wild Conservative Plants List (List 1)" and "the National Important Wild Conservative Plants List (List 1)", there are a total of 54 plant species (48 genera and 33 families); ② The geographical elements are very complicated in Tibet with 12 of 15 distribution patterns of genera classified by academician Wu; ③ There are obvious temperate genera with 28 genera accounting for 60.4% of the total genera; ④ There are abundant endemic species accounting for 18.52% of total species but poor endemic genera; ⑤ The geographical distribution is uneven and a great of species distribute in the areas between 1 000 m and 3 500 m above sea level; ⑥ To protect the rare and endangered plants efficiently, six conservation measures are proposed, and 35 species are suggested for the conservative plants of the autonomous conservation level.

  7. Selective Foraging by Pogonomyrmex salinus (Hymenoptera: Formicidae) in Semiarid Grassland: Implications for a Rare Plant.

    Science.gov (United States)

    Schmasow, Matthew S; Robertson, Ian C

    2016-08-01

    Selective foraging by granivores can have important consequences for the structure and composition of plant communities, and potentially severe consequences for rare plant species. To understand how granivore foraging behavior affects common and rare plant species, diet selection should be viewed relative to the availability of alternative seed options, and with consideration of the individual attributes of those seeds (e.g., morphology, nutrient content). We examined the foraging decisions of Owyhee harvester ants, Pogonomyrmex salinus (Olsen), in semiarid grassland dominated by two species of grass, Poa secunda and Bromus tectorum, and two species of mustard, Sisymbrium altissimum and Lepidium papilliferum The latter is a rare plant endemic to southwestern Idaho, and its seeds are readily consumed by P. salinus We examined the diets of P. salinus colonies in June and July over three years and compared these values to the weekly availability of seeds on the ground in a 3-12 -m radius around individual ant colonies. Small-seeded species (P. secunda, S. altissimum, and L. papilliferum) were usually overrepresented in the diet of ants relative to their availability, whereas the large seeds of B. tectorum were largely avoided despite being abundant and nutritious. The reduced travel time associated with carrying small seeds may overshadow differences in nutritional content among seed types, except in times when small seeds are in short supply. Lepidium papilliferum appears particularly vulnerable to seed predation, likely in part because it grows in dense patches that are easily exploited by foragers.

  8. Flora and ecological characteristics of rare plant communities on the southern slope of Shennongjia Mountain

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    According to the investigation of sampling area of 6800 m2 on the south slope of Shennongjia Mountain, there were 126 vascular plant species, belonging to 108 genera and 64 families, in the investigated rare plant communities, of which 9 rare plant species were recorded, accounting for 27.3% of the total rare plants. The communities were about 30 m in height and were divided into three layers as tree layer, shrub layer, and herb layer. The flora of the communities had obvious temperate character. Phanerophytes (accounted for 65.9%), Mesophyllous (62.7%), Papyraceous (84.1%), simple leaf (83.3%), un-entire leaf (69.8%) were dominant in life form, leaf size class, leaf texture, leaf form, and leaf margin respectively. According to important value of species, the communities were divided into three types as Davidia involucrata + Litsea pungens community, Cercidiphyllum japanicum + Padus wilsonii community, and Padus wilsonii + Acer mono community. The indexes of species diversity of tree layer had little difference among communities and evenness was high. The results indicated that the communities had complex structure and relative stability.

  9. Sacred groves of north Malabar: treasure trove of endemic and rare medicinal plants

    Directory of Open Access Journals (Sweden)

    K. Subrahmanya Prasad

    2011-01-01

    Sacred groves are one of the finest examples of traditional in situ conservation practices and act as treasure house of endemic, endangered and rare plants. Endemic species of any geographical region, throw light on the biogeography of the area, areas of extinction and evolution of the flora. Twelve famous sacred groves of north Malabar region of Kerala were selected for study. Studies were aimed at the documentation of floristic diversity with special reference to endemic as well as RET medicinal plants and to know threats to them. Present inventory accounted for a total of 99 endemic angiosperms, of which 28 qualified for RET categories. Their role in germplasm conservation is evident from the fact that not a single plant is common to the groves studied and restriction of 47 endemic plants to any one of the grove. There are 59 endemic plants, of which 18 belong to RET category are in high demand due to their medicinal properties. Medicinal plant diversity varies from a minimum of 65% to a maximum of 91% while that of endemic plants ranges from 11% in Andallur to 18% in Edayilakkad. Present study revealed the endemic plant diversity of these groves and also their role in the conserving germplasms of wild yam, figs, pepper, mango and a variety of endemic medicinal plants. Like other groves of Kerala, these are also facing the threat of extinction from increasing anthropogenic activities and there is an urgent need of complete protection and public awareness for the existence of these near-climax communities.

  10. Trait space of rare plants in a fire-dependent ecosystem.

    Science.gov (United States)

    Ames, Gregory M; Wall, Wade A; Hohmann, Matthew G; Wright, Justin P

    2017-08-01

    The causes of species rarity are of critical concern because of the high extinction risk associated with rarity. Studies examining individual rare species have limited generality, whereas trait-based approaches offer a means to identify functional causes of rarity that can be applied to communities with disparate species pools. Differences in functional traits between rare and common species may be indicative of the functional causes of species rarity and may therefore be useful in crafting species conservation strategies. However, there is a conspicuous lack of studies comparing the functional traits of rare species and co-occurring common species. We measured 18 important functional traits for 19 rare and 134 common understory plant species from North Carolina's Sandhills region and compared their trait distributions to determine whether there are significant functional differences that may explain species rarity. Flowering, fire, and tissue-chemistry traits differed significantly between rare and common, co-occurring species. Differences in specific traits suggest that fire suppression has driven rarity in this system and that changes to the timing and severity of prescribed fire may improve conservation success. Our method provides a useful tool to prioritize conservation efforts in other systems based on the likelihood that rare species are functionally capable of persisting. © 2016 The Authors. Conservation Biology published by Wiley Periodicals, Inc. on behalf of Society for Conservation Biology.

  11. Managing Natural and Reintroduced Rare Plant Populations within a Large Government Reservation

    Energy Technology Data Exchange (ETDEWEB)

    Carlsen, T M; Paterson, L E; Alfaro, T M

    2009-07-15

    California is home to many large government reservations that have been in existence for decades. Many of these reservations were formed to support various Department of Defense and Department of Energy national defense activities. Often, only a very small percentage of the reservation is actively used for programmatic activities, resulting in large areas of intact habitat. In some cases, this has benefited rare plant populations, as surrounding lands have been developed for residential or industrial use. However, land management activities such as the suppression or active use of fire and other disturbance (such as fire trail grading) can also work to either the detriment or benefit of rare plant populations at these sites. A management regime that is beneficial to the rare plant populations of interest and is at best consistent with existing site programmatic activities, and at a minimum does not impact such activities, has the best potential for a positive outcome. As a result, some species may be 'difficult' while others may be 'easy' to manage in this context, depending on how closely the species biological requirements match the programmatic activities on the reservation. To illustrate, we compare and contrast two rare annual plant species found at Lawrence Livermore National Laboratory's Site 300. Although several populations of Amsinckia grandiflora have been restored on the site, and all populations are intensively managed, this species continues to decline. In contrast, Blepharizonia plumosa appears to take advantage of the annual controlled burns conducted on the site, and is thriving.

  12. Rare and endangered plant species and associations in the Moravica river (Serbia

    Directory of Open Access Journals (Sweden)

    Ljevnaić-Mašić Branka B.

    2016-01-01

    Full Text Available The Moravica is a river in the southeast of Banat (Vojvodina Province, Serbia. This relatively small river is characterised by great floristic richness. A total of 87 taxa were found in the Moravica River. It is a sanctuary for some plant species that are rare and endangered both in Serbia and in Europe. Fifty-five species are on the IUCN Red List of Threatened Species and forty-five species are on the European Red List of Vascular Plants. Species Acorus calamus L., Alisma gramineum Gmel., Iris pseudacorus L., Marsilea quadrifolia L., Potamogeton fluitans Roth. and Utricularia vulgaris L. are protected or strictly protected by law in Serbia. Some of these rare species form stands of aquatic and semiaquatic vegetation rare both in Banat and in Serbia in general, such as: Lemnetum (minori - trisulcae Den Hartog 1963, Potametum nodosi Soó (1928 1960, Segal 1964, Acoreto - Glycerietum aquaticae Slavnić 1956, Rorippo - Oenanthetum (Soó 1927 Lohm. 1950, Pop 1968, and Bolboschoenetum maritimi continentale Soó (1927 1957 subass. marsiletosum quadrifoliae Ljevnaić-Mašić (2010. Because of its great diversity of flora and vegetation, the Moravica River could be a potential Important Plant Area (IPA in the future. Unfortunately, strong anthropogenic influence is a threat to this unique flora and vegetation, so appropriate and timely measures for protecting the aquatic ecosystem need to be implemented.

  13. Rare earth elements determination in medicinal plants by Neutron Activation Analisys

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Rodolfo D.M.R.; Francisconi, Lucilaine S.; Silva, Paulo S.C. da, E-mail: rdmrg89@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    Rare Earth Elements (REEs) have been considered nontoxic for human health and for the environment; however, the use of REEs in the development of recent technologies has increased the interest un their biological effects. Some studies related to their concentration in foodstuffs were published but REEs levels in medicinal plants are still unknown. The objective of this study was to determine the Rees concentration in the set of 59 medicinal herbs commonly used by Brazilian folk. Results showed that plants can concentrate REEs in their aerial parts, but the amount transferred to the extract of these plants is relatively low, resulting in little ingestion of these elements by the population during the extract consumption. (author)

  14. Effects of rare earth elements on growth and metabolism of medicinal plants

    Directory of Open Access Journals (Sweden)

    Chunhong Zhang

    2013-02-01

    Full Text Available The rare earth elements (REEs are a set of 17 chemical elements. They include the lanthanide series from lanthanum (La to lutetium (Lu, scandium (Sc, and yttrium (Y in the periodic table. Although REEs are used widely in industry and agriculture in China for a long time, there has been increasing interest in application of REEs to medicinal plants in recent years. In this paper, we summarize researches in the past few decades regarding the effects of REEs on the germination of seeds, the growth of roots, total biomass, and the production of its secondary metabolites, as well as their effects on the absorption of minerals and metals by medicinal plants. By compilation and analysis of these data, we found that REEs have promoting effects at low concentrations and negative effects at comparatively high concentrations. However, most studies focused only on a few REEs, i.e., La, cerium (Ce, neodymium (Nd and europium (Eu, and they made main emphasis on their effects on regulation of secondary metabolism in tissue-cultured plants, rather than cultivated medicinal plants. Advanced research should be invested regarding on the effects of REEs on yields of cultivated plants, specifically medicinal plants.

  15. Reduced fecundity in small populations of the rare plant Gentianopsis ciliate (Gentianaceae)

    Science.gov (United States)

    Kery, M.; Matthies, D.

    2004-01-01

    Habitat destruction is the main cause for the biodiversity crisis. Surviving populations are often fragmented, i.e., small and isolated from each other. Reproduction of plants in small populations is often reduced, and this has been attributed to inbreeding depression, reduced attractiveness for pollinators, and reduced habitat quality in small populations. Here we present data on the effects of fragmentation on the rare, self-compatible perennial herb Gentianopsis ciliata (Gentianaceae), a species with very small and presumably well-dispersed seeds. We studied the relationship between population size, plant size, and the number of flowers produced in 63 populations from 1996-1998. In one of the years, leaf and flower size and the number of seeds produced per fruit was studied in a subset of 25 populations. Plant size, flower size, and the number of seeds per fruit and per plant increased with population size, whereas leaf length and the number of flowers per plant did not. The effects of population size on reproduction and on flower size remained significant if the effects were adjusted for differences in plant size, indicating that they could not be explained by differences in habitat quality. The strongly reduced reproduction in small populations may be due to pollination limitation, while the reduced flower size could indicate genetic effects.

  16. Commented list of rare and protected vascular plants of inland water bodies of Estonia

    Directory of Open Access Journals (Sweden)

    Helle Mäemets

    2016-10-01

    Full Text Available This presented overview of rare and protected hydrophytes, emergent plants and hygrophytes of inland water bodies of Estonia includes 60 species. In the commented list are indicated their position in the state protection categories I–III (last version in 2014, and under the Red List of Estonia (last version in 2008; marked are Natura 2000 species of the European Union. Most typical habitats for these rare species are: I. soft-water oligotrophic and semidystrophic lakes; II. mesotrophic lakes with Najas (Caulinia flexilis and Potamogeton rutilus; III. alkaline fens and wet meadows; IV. brackish or freshwater coastal lagoons; V. undamaged river stretches; VI. open shallow littoral of the largest lakes of Peipsi (Pskovsko-Chudskoe and of Võrtsjärv. Main threats of these habitats are briefly concerned, as well as the problem of conservation value of hybrids, based on the example of Sparganium species.

  17. Fractionations of rare earth elements in plants and their conceptive model

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Fractionations of rare earth elements (REEs) and their mechanisms in soybean were studied through application of exogenous mixed REEs under hydroponic conditions. Significant enrichment of middle REEs (MREEs) and heavy REEs (HREEs) was observed in plant roots and leaves respectively, with slight fractionation between light REEs (LREEs) and HREEs in stems. Moreover, the tetrad effect was observed in these organs. Investigations into REE speciation in roots and in the xylem sap using X-ray absorption spectroscopy (XAS) and nanometer-sized TiO2 adsorption techniques, associated with other controlled experiments, demonstrated that REE fractionations should be dominated by fixation mechanism in roots caused by cell wall absorption and phosphate precipitation, and by the combined effects of fixation mechanism and transport mechanism in aboveground parts caused by solution complexation by intrinsic organic ligands. A conceptive model was established for REE fractionations in plants based on the above studies.

  18. [Study on species and distribution of flora of national rare and endangered medicinal plant in the Three Gorges area].

    Science.gov (United States)

    Chen, Shao-Cheng

    2013-04-01

    According to the China Plant Red Data Book and National Key Protected Wild Plants, the distribution of the rare and endangered plants and national conservative plants in the Three Gorges area were investigated and statistically analyzed. Its floristic composition and characteristics of geographical distribution were explored. As a result, a total of 97 species of medicinal flora belonging to rare and endangered national protection plants were found in the Three Gorges area. They come from 81 genera of 46 families. Their vertical distribution is obvious and horizontal distribution has discontinuous overlap. There are many ancient relict medicinal plants in the Three Gorges area. These medicinal plants have obvious temperate characteristics, and are easily found at warm and moist ravines and hillsides; The proportion of tree is much higher than that of herb, vine, shrub and fern. Most of them belong to specific and monotypic genera.

  19. Towards a more holistic research approach to plant conservation: the case of rare plants on oceanic islands.

    Science.gov (United States)

    Silva, Luís; Dias, Elisabete Furtado; Sardos, Julie; Azevedo, Eduardo Brito; Schaefer, Hanno; Moura, Mónica

    2015-06-11

    Research dedicated to rare endemic plants is usually focused on one given aspect. However, holistic studies, addressing several key issues, might be more useful, supporting management programmes while unravelling basic knowledge about ecological and population-level processes. A more comprehensive approach to research is proposed, encompassing: phylogenetics/systematics, pollination biology and seed dispersal, propagation, population genetics, species distribution models (SDMs), threats and monitoring. We present a holistic study dedicated to Veronica dabneyi Hochst. ex Seub., an endangered chamaephyte endemic to the Azores. Veronica dabneyi was mainly found associated with other endemic taxa; however, invasive plants were also present and together with introduced cattle, goats and rabbits are a major threat. Most populations grow at somewhat rocky and steep locations that appeared to work as refuges. Seed set in the wild was generally high and recruitment of young plants from seed seemed to be frequent. In the laboratory, it was possible to germinate and fully develop V. dabneyi seedlings, which were planted at their site of origin. No dormancy was detected and time for 50 % germination was affected by incubation temperature. Eight new microsatellite markers were applied to 72 individuals from 7 sites. A considerable degree of admixture was found between samples from the two islands Flores and Corvo, with 98 % of the genetic variability allocated within populations. Levels of heterozygosity were high and no evidence of inbreeding was found. Species distribution models based on climatic and topographic variables allowed the estimation of the potential distribution of V. dabneyi on Flores and Corvo using ecological niche factor analysis and Maxent. The inclusion of land-use variables only slightly increased the information explained by the models. Projection of the expected habitat in Faial largely coincided with the only historic record of V. dabneyi on that island

  20. Micropropagation and in vitro conservation of the rare and threatened plants Ramonda serbica and Ramonda nathaliae.

    Science.gov (United States)

    Gashi, Bekim; Abdullai, Kasamedin; Sota, Valbona; Kongjika, Efigjeni

    2015-01-01

    Ramonda serbica and Ramonda nathaliae are rare and endemo relict plant species from Balkan Peninsula. An efficient micro propagation and in vitro conservation method via direct and indirect organogenesis from seed and leaf explants, respectively, was established in this study. The seed of both Ramonda species were collected from different populations in Kosovo, and were germinated in nutrient media JG-B without any phytohormone. The highest number of shoots and multiplication rate was observed on JG-B medium supplemented with BAP and IAA (0.5 mg l(-1) each), whereas the highest number of leaves per plantlets was found on WPM and RA medium supplemented with BAP and IAA (0.1 mg l(-1) each). During this stage of micro propagation some significant differences were observed in plantlets from different populations. The indirect organogenesis from parts of leaves of natural plants was not successful due to unavailability of established protocol for disinfections of the plant material. On other hand, parts of leaves from micro propagated plantlets, cultured on MS medium supplemented with different ratio of BAP and NAA, resulted in the highest efficiency for shoot regeneration. In vitro conservation of micro propagated plants at the lower temperature (4 °C) had a significantly positive effect for storage of more than 12 months.

  1. Abundantly and rarely expressed Lhc protein genes exhibit distinct regulation patterns in plants.

    Science.gov (United States)

    Klimmek, Frank; Sjödin, Andreas; Noutsos, Christos; Leister, Dario; Jansson, Stefan

    2006-03-01

    We have analyzed gene regulation of the Lhc supergene family in poplar (Populus spp.) and Arabidopsis (Arabidopsis thaliana) using digital expression profiling. Multivariate analysis of the tissue-specific, environmental, and developmental Lhc expression patterns in Arabidopsis and poplar was employed to characterize four rarely expressed Lhc genes, Lhca5, Lhca6, Lhcb7, and Lhcb4.3. Those genes have high expression levels under different conditions and in different tissues than the abundantly expressed Lhca1 to 4 and Lhcb1 to 6 genes that code for the 10 major types of higher plant light-harvesting proteins. However, in some of the datasets analyzed, the Lhcb4 and Lhcb6 genes as well as an Arabidopsis gene not present in poplar (Lhcb2.3) exhibited minor differences to the main cooperative Lhc gene expression pattern. The pattern of the rarely expressed Lhc genes was always found to be more similar to that of PsbS and the various light-harvesting-like genes, which might indicate distinct physiological functions for the rarely and abundantly expressed Lhc proteins. The previously undetected Lhcb7 gene encodes a novel plant Lhcb-type protein that possibly contains an additional, fourth, transmembrane N-terminal helix with a highly conserved motif. As the Lhcb4.3 gene seems to be present only in Eurosid species and as its regulation pattern varies significantly from that of Lhcb4.1 and Lhcb4.2, we conclude it to encode a distinct Lhc protein type, Lhcb8.

  2. Podarcis lilfordi from the Balearic islands as a potential disperser of the rare Mediterranean plant Withania frutescens

    Science.gov (United States)

    Castilla, Aurora M.

    1999-04-01

    This study examines whether the lizard Podarcis lilfordi is a legitimate disperser of the rare Mediterranean plant Withania frutescens by using the biochemical test of triphenyl-2H-tetrazolium chloride for testing seed viability. This lizard eats the fresh fruits of the plants and defecates intact seeds which have been retained 1 to 3 d in their gut. Viability of seeds recovered from faeces was very high and comparable to the viability of fresh seeds. Seed dispersal by this lizard in the Balearic islands may facilitate population expansion of this rare plant in the Balearics.

  3. Responses of plant calmodulin to endocytosis induced by rare earth elements.

    Science.gov (United States)

    Wang, Lihong; Cheng, Mengzhu; Chu, Yunxia; Li, Xiaodong; Chen, David D Y; Huang, Xiaohua; Zhou, Qing

    2016-07-01

    The wide application of rare earth elements (REEs) have led to their diffusion and accumulation in the environment. The activation of endocytosis is the primary response of plant cells to REEs. Calmodulin (CaM), as an important substance in calcium (Ca) signaling systems, regulating almost all of the physiological activities in plants, such as cellular metabolism, cell growth and division. However, the response of CaM to endocytosis activated by REEs remains unknown. By using immunofluorescence labeling and a confocal laser scanning microscope, we found that trivalent lanthanum [La(III)], an REE ion, affected the expression of CaM in endocytosis. Using circular dichroism, X-ray photoelectron spectroscopy and computer simulations, we demonstrated that a low concentration of La(III) could interact with extracellular CaM by electrostatic attraction and was then bound to two Ca-binding sites of CaM, making the molecular structure more compact and orderly, whereas a high concentration of La(III) could be coordinated with cytoplasmic CaM or bound to other Ca-binding sites, making the molecular structure more loose and disorderly. Our results provide a reference for revealing the action mechanisms of REEs in plant cells.

  4. Chemical Constituents of the Rare Cliff Plant Oresitrophe rupifraga and Their Antineuroinflammatory Activity.

    Science.gov (United States)

    Wu, Xi-Ying; Xiong, Juan; Liu, Xin-Hua; Hu, Jin-Feng

    2016-08-01

    Four new (1 - 4) and thirteen known (5 - 17) compounds were isolated from a rare cliff plant, Oresitrophe rupifraga. Based on spectroscopic evidence, the new structures were established to be [(2S,3R,4R)-4-(4-methoxybenzyl)-2-(4-methoxyphenyl)-tetrahydrofuran-3-yl]methanol (1), (3α)-23-(acetyloxy)-3-hydroxyolean-12-en-29-oic acid (2), 3α,23-(isopropylidenedioxy)olean-12-en-29-oic acid (3, artifact of isolation), and (3β,15β)-3-hydroxycholest-5-en-15-yl β-d-glucopyranoside (4), respectively. Among the isolates, compounds 1, 4, epieudesmin (7), and 1-O-(9Z,12Z,15Z-octadecatrienoyl)glycerol (17) were found to show significant antineuroinflammatory effects by inhibiting the NO production in lipopolysaccharide (LPS)-stimulated murine BV-2 microglial cells, with IC50 values of 7.21, 9.39, 4.96, and 8.51 μm, respectively.

  5. Predictive distribution modeling for rare Himalayan medicinal plant Berberis aristata DC.

    Science.gov (United States)

    Ray, Rajasri; Gururaja, K V; Ramchandra, T V

    2011-11-01

    Predictive distribution modelling of Berberis aristata DC, a rare threatened plant with high medicinal values has been done with an aim to understand its potential distribution zones in Indian Himalayan region. Bioclimatic and topographic variables were used to develop the distribution model with the help of three different algorithms viz. Genetic Algorithm for Rule-set Production (GARP), Bioclim and Maximum entropy (MaxEnt). Maximum entropy has predicted wider potential distribution (10.36%) compared to GARP (4.63%) and Bioclim (2.44%). Validation confirms that these outputs are comparable to the present distribution pattern of the B. aristata. This exercise highlights that this species favours Western Himalaya. However, GARP and MaxEnt's prediction of Eastern Himalayan states (i. e. Arunachal Pradesh, Nagaland and Manipur) are also identified as potential occurrence places require further exploration.

  6. Strong potential for endozoochory by waterfowl in a rare, ephemeral wetland plant species, Astragalus contortuplicatus (Fabaceae

    Directory of Open Access Journals (Sweden)

    Ádám Lovas-Kiss

    2015-10-01

    Full Text Available It was proposed previously that passive dispersal by migratory aquatic birds explain the widespread distribution of many wetland organisms. Several experimental studies have shown that many widespread wetland plant species can be readily dispersed within the guts of Anatidae. However, it is unclear whether plants with a more restricted distribution are able to disperse via waterbirds. This paper addresses the dispersal ability and germination ecology of the little-known Hungarian milkvetch Astragalus contortuplicatus, which occurs on banks of continental rivers and has a limited and unpredictable distribution. To test whether limited capacity for endozoochory by waterfowl could explain the sporadic appearance of this species, we force-fed ten captive mallards (Anas platyrhynchos with 100 milkvetch seeds each. Droppings were collected for up to 45 h after feeding. Intact and viable seeds were found in the droppings of each mallard, and altogether 24.7% of seeds fed were recovered intact. The proportion of retrieved seeds that germinated (27.0% was significantly higher than that of untreated control seeds (0.5%, but significantly lower than that of mechanically scarified seeds (96.0%. Retrieved seeds that germinated developed into healthy mature plants. Given the average flight velocity of mallards, seeds of A. contortuplicatus may travel up to 1600 km inside the digestive tract of migrating individuals. Our results suggest that avian vectors may be more important for the dispersal of rare higher plants (especially those with a hard seed-coat than hitherto considered. Moreover, they suggest that rarity does not necessarily indicate limited dispersal ability, and may instead be explained by specific habitat requirements.

  7. The Quest for Rare Variants: Pooled Multiplexed Next Generation Sequencing in Plants

    Directory of Open Access Journals (Sweden)

    Fabio eMarroni

    2012-06-01

    Full Text Available Next generation sequencing (NGS instruments produce an unprecedented amount of sequence data at contained costs. This gives researchers the possibility of designing studies with adequate power to identify rare variants at a fraction of the economic and labor resources required by individual Sanger sequencing. As of today, only three research groups working in plant sciences have exploited this potentiality. They showed that pooled NGS can provide results in excellent agreement with those obtained by individual Sanger sequencing. Aim of this review is to convey to the reader the general ideas underlying the use of pooled NGS for the identification of rare variants. To facilitate a thorough understanding of the possibilities of the method we will explain in detail the variations in study design and discuss their advantages and disadvantages. We will show that information on allele frequency obtained by pooled next generation sequencing can be used to accurately compute basic population genetics indexes such as allele frequency, nucleotide diversity and Tajima’s D. Finally we will discuss applications and future perspectives of the multiplexed NGS approach.

  8. Ecology of rare water plant communities in lakes of north-eastern Poland

    Directory of Open Access Journals (Sweden)

    Ewa Jabłońska

    2012-03-01

    Full Text Available Habitat studies were conducted on three rare plant communities dominated by Nuphar pumila, Nymphaea candida and Hydrilla verticillata in lakes of north-eastern Poland. The comparison of habitat properties of these three types of phytocoenoses with those of Nuphar lutea common in the area under study was also performed. It was demonstrated that the plant communities studied were ecologically distinct. The habitats of the phytocoenoses of N. pumila differed most significantly from those of the other phytocoenoses. They often inhabited softer waters poor in Mg2+, dissolved SiO2, but rich in total Fe, PO43−, NO3−, and were associated with acidic substrates containing lower levels of Ca2+ and Na+, but greater amounts of total Fe and NO3−. The differences in the habitats of H. verticillata and N. candida phytocoenoses were most pronounced in the case of four properties of water: Na+, K+, Cl−, and Mg+. Their values were lower in waters of the H. verticillata phytocoenoses. The habitats of all the three types of rare phytocoenoses differed considerably from those of N. lutea. The most significant differences were found between the N. lutea and N. pumila phytocoenoses and the smallest differences were between the patches of N. lutea and N. candida. The properties of water were more important in differentiating the habitats of the phytocoenoses studied than the substrate properties. Due to alkalization and increase in water hardness in the lakes studied the stands of N. pumila are among the most threatened. The patches of N. candida and H. verticillata, which occur in waters with a wider range of hardness and tolerating a slight increase in trophy, can still continue to persist in the lakes for a long time.

  9. Floral biology of Senecio macrophyllus M. BIEB. (Asteraceae, a rare Central European steppe plant

    Directory of Open Access Journals (Sweden)

    Bożenna Czarnecka

    2014-03-01

    Full Text Available Knowledge of the flowering phase and plant pollination ecology is very important for understanding the life history of long-lived perennials. In the case of rare species, the information may have implications for conservation practices. Our studies on flower morphology and blooming biology of the vulnerable plant Senecio macrophyllus M. BIEB. were conducted in situ (flowering, activity of insect visitors in the largest population in SE Poland and in laboratory (light and scanning electron microscopy. The disc florets open diurnally with most intensive anthesis in the early afternoon and attract insect visitors with nectar and pollen. In highly protandrous disc florets, pollen viability decreases in time, whereas stigma receptivity increases. The upper part of the pistil forms a brush-like pollen presenter, covered with unicellular trichomes with chromoplasts. Pollen presentation lasts 4–11 hours per floret, and 8 days in a single head, the main function of which is to extend the availability of male gamets for reproduction. The number of florets per head, the head size, and the number of pollen grains produced per anther, and the pollen grain viability differed significantly between microsites. The finding indicates that, apart from the biotic factors, abiotic conditions may considerably influence generative reproduction of the species. In the study area, the principal visitors of S. macrophyllus flowers were Hymenoptera, with predominance of Apis mellifera (53.4% of visits. The remarkable share of butterflies (13.9% recognized as the long-distance moving insects may improve the genetic variability of individuals within a fragmented population. A more detailed study is necessary to explain the role of insect visitors in effective pollination and in gene transfer between patches. The assessment of optimal conditions for the generative reproduction is fundamental for the in situ conservation of this rare species.

  10. Resource management plan for the Oak Ridge Reservation. Volume 29, Rare plants on the Oak Ridge Reservation

    Energy Technology Data Exchange (ETDEWEB)

    Cunningham, M. [Science Applications International Corp., Oak Ridge, TN (United States); Pounds, L. [Tennessee Univ., Knoxville, TN (United States); Oberholster, S. [USDA Forest Service, Montgomery, AL (United States); Parr, P.; Mann, L. [Oak Ridge National Lab., TN (United States); Edwards, L. [Clemson Univ., SC (United States). Dept. of Forestry; Rosensteel, B. [JAYCOR Environmental, Vienna, VA (United States)

    1993-08-01

    Rare plant species listed by state or federal agencies and found on or near the Department of Energy`s Oak Ridge Reservation (ORR) are identified. Seventeen species present on the ORR are listed by the Tennessee Department of Environment and Conservation as either endangered, threatened, or of special concern. Four of these are under review by the US Fish and Wildlife Service for possible listing as threatened or endangered species. Ten species listed by the state occur near and may be present on the ORR; four are endangered in Tennessee, and one is a candidate for federal listing. A range of habitats supports the rare taxa on the ORR: River bluffs, calcareous barrens, wetlands, and deciduous forest. Sites for listed rare species on the ORR have been designated as Research Park Natural Areas. Consideration of rare plant habitats is an important component of resource management and land-use planning; protection of rare species in their natural habitat is the best method of ensuring their long-term survival. In addition, the National Environmental Policy Act requires that federally funded projects avoid or mitigate impacts to listed species. The list of rare plant species and their location on the ORR should be considered provisional because the entire ORR has not been surveyed, and state and federal status of all species continues to be updated.

  11. Melampyrum Cristatum L. – A Rare River Corridor Plant in Wielkopolska and Poland

    Directory of Open Access Journals (Sweden)

    Stachnowicz Wojciech

    2013-12-01

    Full Text Available Melampyrum cristatum is an extremely rare, native, hemi-parasitic, vascular plant, recently considered to be extinct in Poland. The article presents data concerning new localities of the species recorded in 2007-2012 in the valley of the River Warta (Wielkopolska, Poland. Local distribution of M. cristatum in the Natura 2000 sites: PLH300012 - Rogalińska Dolina Warty (ca. 147.5 sq. km and PLH300053 - Lasy Żerkowsko-Czeszewskie (ca. 71.6 sq. km, as well as its updated regional (in Wielkopolska and national (Poland ranges are shown on maps and interpreted on the background of the geomorphic diversity of occupied habitats. The results suggest that in Poland the species is distributed mainly along valleys of large, lowland rivers, which corresponds with its ‘River Corridor Plant’ status in Central Europe. The species rarity is discussed considering its outline phytocoenological scale (comprising various plant communities within 6 syntaxonomical classes, the riverine distribution pattern and chosen biological features. Natural habitat heterogeneity along with changeable water regime in floodplains, as well as potential limitations of myrmecochoric seed dispersal, may constitute potential reasons for the species low frequency

  12. ABOUT CREATION OF MODELS OF NATURAL PLANT COMMUNITIES, INCLUDING RARE SPECIES, IN THE BOTANICAL GARDENS OF KRASNODAR

    Directory of Open Access Journals (Sweden)

    Bakalov A. N.

    2013-10-01

    Full Text Available One of the ways to save rare species of plants is to create models of natural communities on the grounds of the botanical gardens. In the Botanical Garden of Kuban State University we have created the model of forest communities with the participation of rare and endangered species, and we are still working on creating models of herbaceous communities. We have introduced 18 species of plants of the flora of the Krasnodar region in the forest community and more than 30 species in herbaceous community

  13. Environ: E00303 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available E00303 Dictamnus root bark Crude drug Dictamine, Skimmianine [CPD:C10740], Limonin ...taceae (rue family) Dictamnus root bark Crude drugs [BR:br08305] Dicot plants: rosids Rutaceae (rue family) E00303 Dictamnus root bark ...

  14. Rare earth elements and titanium in plants, soils and groundwaters in the alkaline-ultramafic complex of Salitre, MG Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Ceccantini, G. [Instituto de Biociencias, Sao Paulo, (Brazil). Dept. de Botanica; Figueiredo, A.M.G. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Div. de Radioquimica; Sondag, F.; Soubies, F. [ORSTOM, 93 - Bondy (France); Soubies, F. [Universite Paul Sabatier, 31 - Toulouse (France)

    1997-12-31

    The contents of rare earth elements (REE) and titanium in various plant species, in groundwaters and in soils from the alkaline-ultramafic complex of Salitre, have been determined. Due to the the particular mineralogy of the bedrock, REE and Ti exhibit high concentrations in the soils. Despite this, plants generally present REE concentrations within the ranges usually found in plants, and the transfer factor from soil to plant is at least ten times below the range reported in the literature, confirming that the concentrations of REE in the plants are widely independent of the soil content. All species present normalized patterns similar to those of the soils, characterized by an enrichment in light REE. Several plants show Ti concentrations about three times higher than the reference values. It is suggested that in the studied ecosystem, the plant metabolism affect the REE distribution in the groundwaters, leading to an enrichment of the superficial waters in heavy REE

  15. Modeling Spatial Distribution of a Rare and Endangered Plant Species (Brainea insignis) in Central Taiwan

    Science.gov (United States)

    Wang, W.-C.; Lo, N.-J.; Chang, W.-I.; Huang, K.-Y.

    2012-07-01

    With an increase in the rate of species extinction, we should choose right methods that are sustainable on the basis of appropriate science and human needs to conserve ecosystems and rare species. Species distribution modeling (SDM) uses 3S technology and statistics and becomes increasingly important in ecology. Brainea insignis (cycad-fern, CF) has been categorized a rare, endangered plant species, and thus was chosen as a target for the study. Five sampling schemes were created with different combinations of CF samples collected from three sites in Huisun forest station and one site, 10 km farther north from Huisun. Four models, MAXENT, GARP, generalized linear models (GLM), and discriminant analysis (DA), were developed based on topographic variables, and were evaluated by five sampling schemes. The accuracy of MAXENT was the highest, followed by GLM and GARP, and DA was the lowest. More importantly, they can identify the potential habitat less than 10% of the study area in the first round of SDM, thereby prioritizing either the field-survey area where microclimatic, edaphic or biotic data can be collected for refining predictions of potential habitat in the later rounds of SDM or search areas for new population discovery. However, it was shown unlikely to extend spatial patterns of CFs from one area to another with a big separation or to a larger area by predictive models merely based on topographic variables. Follow-up studies will attempt to incorporate proxy indicators that can be extracted from hyperspectral images or LIDAR DEM and substitute for direct parameters to make predictive models applicable on a broader scale.

  16. Predicting habitat suitability for rare plants at local spatial scales using a species distribution model.

    Science.gov (United States)

    Gogol-Prokurat, Melanie

    2011-01-01

    If species distribution models (SDMs) can rank habitat suitability at a local scale, they may be a valuable conservation planning tool for rare, patchily distributed species. This study assessed the ability of Maxent, an SDM reported to be appropriate for modeling rare species, to rank habitat suitability at a local scale for four edaphic endemic rare plants of gabbroic soils in El Dorado County, California, and examined the effects of grain size, spatial extent, and fine-grain environmental predictors on local-scale model accuracy. Models were developed using species occurrence data mapped on public lands and were evaluated using an independent data set of presence and absence locations on surrounding lands, mimicking a typical conservation-planning scenario that prioritizes potential habitat on unsurveyed lands surrounding known occurrences. Maxent produced models that were successful at discriminating between suitable and unsuitable habitat at the local scale for all four species, and predicted habitat suitability values were proportional to likelihood of occurrence or population abundance for three of four species. Unfortunately, models with the best discrimination (i.e., AUC) were not always the most useful for ranking habitat suitability. The use of independent test data showed metrics that were valuable for evaluating which variables and model choices (e.g., grain, extent) to use in guiding habitat prioritization for conservation of these species. A goodness-of-fit test was used to determine whether habitat suitability values ranked habitat suitability on a continuous scale. If they did not, a minimum acceptable error predicted area criterion was used to determine the threshold for classifying habitat as suitable or unsuitable. I found a trade-off between model extent and the use of fine-grain environmental variables: goodness of fit was improved at larger extents, and fine-grain environmental variables improved local-scale accuracy, but fine-grain variables

  17. A list of records of some rare vascular plants occurring in the Maltese Islands (Central Mediterranean) Part 2

    OpenAIRE

    Tabone, Timothy J.

    2008-01-01

    A check-list of one hundred and twenty-three (123) rare or infrequent vascular plant species occurring in the Maltese Islands is hereby given, along with brief notes concerning the record date and location, population size and distribution on the islands.

  18. Patterns and correlates of plant diversity differ between common and rare species in a neotropical dry forest

    NARCIS (Netherlands)

    Tetetla-Rangel, Erika; Dupuy, Juan Manuel; Hernández-Stefanoni, José Luis; Hoekstra, Paul H.

    2017-01-01

    Determining which factors affect species richness is important for conservation theory and practice. However, richness of common and rare species may be affected by different factors. We use an extensive inventory of woody plants from a tropical dry forest landscape in Yucatan, Mexico to assess the

  19. Rare earth elements (REEs): effects on germination and growth of selected crop and native plant species.

    Science.gov (United States)

    Thomas, Philippe J; Carpenter, David; Boutin, Céline; Allison, Jane E

    2014-02-01

    The phytotoxicity of rare earth elements (REEs) is still poorly understood. The exposure-response relationships of three native Canadian plant species (common milkweed, Asclepias syriaca L., showy ticktrefoil, Desmodium canadense (L.) DC. and switchgrass, Panicum virgatum L.) and two commonly used crop species (radish, Raphanus sativus L., and tomato, Solanum lycopersicum L.) to the REEs lanthanum (La), yttrium (Y) and cerium (Ce) were tested. In separate experiments, seven to eight doses of each element were added to the soil prior to sowing seeds. Effects of REE dose on germination were established through measures of total percent germination and speed of germination; effects on growth were established through determination of above ground biomass. Ce was also tested at two pH levels and plant tissue analysis was conducted on pooled samples. Effects on germination were mostly observed with Ce at low pH. However, effects on growth were more pronounced, with detectable inhibition concentrations causing 10% and 25% reductions in biomass for the two native forb species (A. syriaca and D. canadense) with all REEs and on all species tested with Ce in both soil pH treatments. Concentration of Ce in aboveground biomass was lower than root Ce content, and followed the dose-response trend. From values measured in natural soils around the world, our results continue to support the notion that REEs are of limited toxicity and not considered extremely hazardous to the environment. However, in areas where REE contamination is likely, the slow accumulation of these elements in the environment could become problematic.

  20. Seasonal timing of first rain storms affects rare plant population dynamics

    Science.gov (United States)

    Levine, J.M.; McEachern, A.K.; Cowan, C.

    2011-01-01

    A major challenge in forecasting the ecological consequences of climate change is understanding the relative importance of changes to mean conditions vs. changes to discrete climatic events, such as storms, frosts, or droughts. Here we show that the first major storm of the growing season strongly influences the population dynamics of three rare and endangered annual plant species in a coastal California (USA) ecosystem. In a field experiment we used moisture barriers and water addition to manipulate the timing and temperature associated with first major rains of the season. The three focal species showed two- to fivefold variation in per capita population growth rates between the different storm treatments, comparable to variation found in a prior experiment imposing eightfold differences in season-long precipitation. Variation in germination was a major demographic driver of how two of three species responded to the first rains. For one of these species, the timing of the storm was the most critical determinant of its germination, while the other showed enhanced germination with colder storm temperatures. The role of temperature was further supported by laboratory trials showing enhanced germination in cooler treatments. Our work suggests that, because of species-specific cues for demographic transitions such as germination, changes to discrete climate events may be as, if not more, important than changes to season-long variables.

  1. Geographic profiling to assess the risk of rare plant poaching in natural areas

    Science.gov (United States)

    Young, J.A.; Van Manen, F.T.; Thatcher, C.A.

    2011-01-01

    We demonstrate the use of an expert-assisted spatial model to examine geographic factors influencing the poaching risk of a rare plant (American ginseng, Panax quinquefolius L.) in Shenandoah National Park, Virginia, USA. Following principles of the analytic hierarchy process (AHP), we identified a hierarchy of 11 geographic factors deemed important to poaching risk and requested law enforcement personnel of the National Park Service to rank those factors in a series of pair-wise comparisons. We used those comparisons to determine statistical weightings of each factor and combined them into a spatial model predicting poaching risk. We tested the model using 69 locations of previous poaching incidents recorded by law enforcement personnel. These locations occurred more frequently in areas predicted by the model to have a higher risk of poaching than random locations. The results of our study can be used to evaluate resource protection strategies and to target law enforcement activities. ?? Springer Science+Business Media, LLC (outside the USA) 2011.

  2. Impact of plant species, substrate types and porosity on the fractionation of rare-earth elements in plants

    Science.gov (United States)

    Semhi, K.; Clauer, N.; Chaudhuri, S.

    2009-04-01

    The distribution and content of rare-earth elements (REEs) were determined in two radish species (Raphanus sativus and Raphanus raphanistrum) that were grown under laboratory-controlled conditions, in three substrates consisting in illite for one and in smectite for the two others, the two latter being of the same type but with different porosities. The plants were split into two segments: the leaves and the stems+roots. The results indicate that both species pick up systematically higher amounts of REEs when grown in the illite substrate, considering that the smectite contains about 3 times more REEs. In R. sativus, the REE concentration of the leaves and of the stems+roots, whatever the substrate, ranges from 1.4 to 1.9 g/g. After normalization to the substrate in which they grew, the distribution patterns for the leaves of those from illite substrate are nearly flat, but irregular with a positive Eu anomaly. Those for the stems+roots are similar, but enriched in heavy REEs, also with a positive Eu anomaly. The REE concentrations of the leaves and the stems+roots of R. sativus grown in smectite are analytically similar at 1.6 and 1.4 g/g, respectively. The REE distribution patterns for the two organs, normalized again to those of the substrate, are very similar, flat with a distinct Eu anomaly. The heavy REE of the stems+roots of R. sativus grown on illite are enriched relative to those of the leaves, and a distinct positive Eu anomaly is observed in both the leaves and stems+roots from species grown on both illite and smectite. In the case of R. raphanistrum, the REE concentrations of the leaves and the stems+roots for those grown in the illite substrate were found to be significantly different at 11.0 and 6.6 g/g, respectively. The REE distribution patterns for the two different plant organs normalized to those of the substrates were found to be quite similar, all being quite flat, with a more or less pronounced Ce negative anomaly, and a prominent

  3. San Diego Multiple Species Conservation Program (MSCP) Rare Plant Monitoring Review and Revision

    Science.gov (United States)

    McEachern, Kathryn; Pavlik, Bruce M.; Rebman, Jon; Sutter, Rob

    2007-01-01

    Introduction The San Diego Multiple Species Conservation Program (MSCP) was developed for the conservation of plants and animals in the south part of San Diego County, under the California Natural Community Conservation Planning Act of 1991 (California Department of Fish and Game) and the Federal Endangered Species Act of 1973, as amended (16 U.S. Code 1531-1544.) The Program is on the leading edge of conservation, as it seeks to both guide development and conserve at-risk species with the oversight of both State and Federal agencies. Lands were identified for inclusion in the MSCP based on their value as habitat for at-risk plants or plant communities (Natural Community Conservation Planning, 2005). Since its inception in the mid-1990s the Program has protected over 100,000 acres, involving 15 jurisdictions and the U.S. Fish and Wildlife Service (USFWS) and California Department of Fish and Game (CDFG) in the conservation of 87 taxa. Surveys for covered species have been conducted, and management and monitoring have been implemented at some high priority sites. Each jurisdiction or agency manages and monitors their conservation areas independently, while collaborating regionally for long-term protection. The San Diego MSCP is on the forefront of conservation, in one of the most rapidly growing urban areas of the country. The planning effort that developed the MSCP was state-of-the-art, using expert knowledge, spatial habitat modeling, and principles of preserve design to identify and prioritize areas for protection. Land acquisition and protection are ahead of schedule for most jurisdictions. Surveys have verified the locations of many rare plant populations known from earlier collections, and they provide general information on population size and health useful for further conservation planning. Management plans have been written or are in development for most MSCP parcels under jurisdictional control. Several agencies are developing databases for implementation

  4. Vegetation Description, Rare Plant Inventory, and Vegetation Monitoring for Craig Mountain, Idaho.

    Energy Technology Data Exchange (ETDEWEB)

    Mancuso, Michael; Moseley, Robert

    1994-12-01

    The Craig Mountain Wildlife Mitigation Area was purchased by Bonneville Power Administration (BPA) as partial mitigation for wildlife losses incurred with the inundation of Dworshak Reservoir on the North Fork Clearwater River. Upon completion of the National Environmental Protection Act (NEPA) process, it is proposed that title to mitigation lands will be given to the Idaho Department of Fish and Game (IDFG). Craig Mountain is located at the northern end of the Hells Canyon Ecosystem. It encompasses the plateau and steep canyon slopes extending from the confluence of the Snake and Salmon rivers, northward to near Waha, south of Lewiston, Idaho. The forested summit of Craig Mountain is characterized by gently rolling terrain. The highlands dramatically break into the canyons of the Snake and Salmon rivers at approximately the 4,700 foot contour. The highly dissected canyons are dominated by grassland slopes containing a mosaic of shrubfield, riparian, and woodland habitats. During the 1993 and 1994 field seasons, wildlife, habitat/vegetation, timber, and other resources were systematically inventoried at Craig Mountain to provide Fish and Game managers with information needed to draft an ecologically-based management plan. The results of the habitat/vegetation portion of the inventory are contained in this report. The responsibilities for the Craig Mountain project included: (1) vegetation data collection, and vegetation classification, to help produce a GIS-generated Craig Mountain vegetation map, (2) to determine the distribution and abundance of rare plants populations and make recommendations concerning their management, and (3) to establish a vegetation monitoring program to evaluate the effects of Fish and Game management actions, and to assess progress towards meeting habitat mitigation goals.

  5. Photosynthetic Characterization of the Plant Dicranopteris dichotoma Bernh. in a Rare Earth Elements Mine

    Institute of Scientific and Technical Information of China (English)

    Li-Feng WANG; Hong-Bing JI; Ke-Zhi BAI; Liang-Bi LI; Ting-Yun KUANG

    2005-01-01

    In order to investigate the distribution of rare earth elements (REEs) in the natural hyperaccumulator fern Dicranopteris dichotoma Bernh. and to characterize this plant photosynthetically,concentrations of REEs in D. dichotoma from mines mining heavy and light REEs (HREEs and LREEs,respectively), as well as in D. dichotoma from an area in which no mining occurred, in southern Jiangxi Province were determined using inductively coupled plasma-mass spectrometry. The REE concentrations in the lamina of D. dichotoma were in the order LREEs mine > HREEs mine > non-mining area. The maximum REE content in the lamina of D. dichotoma from the LREE mine was approximately 2 648 mg/kg dry weight.The photosynthetic activity of D. dichotoma from areas of HREE and LREE mines was improved by the presence of high concentrations of REEs in the lamina compared with D. dichotoma from the non-mining area. However, this enhancement varied according to the concentrations of the REEs, as well as their type.In addition, 77K fluorescence, electron transport rate, and chlorophyll-protein complex studies showed that the enhancement of the photosynthetic activity of D. dichotoma from HREE mines was mainly due to an increase in the chlorophyll-protein complex of the reaction center of photosystem (PS) I, whereas the enhancement observed in D. dichotoma from LREE mines was due to an increase in the internal antennae chlorophyll-protein complex of PS Ⅱ and greater light energy distribution to the light-harvesting chlorophyll-protein complex of PS Ⅱ.

  6. Pharmacokinetics, tissue distribution and excretion study of dictamnine, a major bioactive component from the root bark of Dictamnus dasycarpus Turcz. (Rutaceae).

    Science.gov (United States)

    Wang, Pei; Sun, Jianbo; Xu, Jingyao; Yan, Qin; Gao, Enze; Qu, Wei; Zhao, Yunli; Yu, Zhiguo

    2013-12-30

    Dictamnine is an herbal ingredient isolated from the root bark of Dictamnus dasycarpus Turcz. (Rutaceae). The present study was aimed at the development of an ultra-high performance liquid chromatography-tandem mass spectrometry method to quantify the concentration of dictamnine in rat plasma and tissues for the in vivo pharmacokinetics, tissue distribution and excretion study. Biological samples were processed with protein precipitation. Skimmianine was chosen as internal standard. The chromatographic separation was carried out on a Thermo Syncronis C18 column (2.1mm×50mm, 1.7μm) with an isocratic mobile phase consisting of methanol and 0.1% formic acid water (75:25, v/v). The detection was accomplished by using positive ion electrospray ionization in multiple reaction monitoring (MRM) mode. The MS/MS ion transitions were monitored at m/z 200.0→129.0 for dictamnine and 260.3→227.1 for IS, respectively. An excellent linearity was observed over the concentration range from 0.5 to 250ng/mL. The lower limit of quantification (LLOQ) was 0.5ng/mL for dictamnine. The developed method was rapid, accurate, and highly sensitive and selective. It was successfully applied to the in vivo pharmacokinetics, tissue distribution and excretion study of dictamnine in rats after oral or intravenous administration of dictamnine.

  7. Biogeochemical investigation in south eastern Andhra Pradesh: the distribution of rare earths, thorium and uranium in plants and soils

    Energy Technology Data Exchange (ETDEWEB)

    Raju, K.K.; Raju, A.N. [Sri Venkateswara Univ., Tirupati (India). Dept. of Geology

    2000-09-01

    The concentration of rare earth elements (REE), thorium and uranium were determined by inductively coupled plasma mass spectrometry (ICP-MS) in the plant species, Pterocarpus santalinus, P. marsupium and P. dalbergioides, and the soils on which they were growing. Higher concentrations of lanthanum (La), cerium (Ce) were observed in both plants and soils. Large amounts of thorium and uranium were found in the soil. In all tree species, the concentration of REEs were higher in the heartwood than the leaves. The heartwood of P. santalinus accumulated larger quantities of uranium (average concentration of 1.22 ppm) and thorium (mean value of 2.57 ppm) than the other two species. (orig.)

  8. Using experiments and demographic models to assess rare plant vulnerability to utlity-scale solar energy development

    Science.gov (United States)

    Moore, K. A.

    2015-12-01

    Pressing challenges for the implementation of solar energy are the effects of construction and operation on protected animal and plant species. Siting and mitigation of solar energy often requires understanding of basic biology and distributions of rare species that are unknown. How can we rapidly collect the information necessary on species- and site-specific population dynamics to effectively design mitigation and conservation measures? We have developed an integrated approach to assessing the vulnerability of a suite of representative rare plant species in the region. We implemented a prioritized series of demographic and experimental studies over the past four years to identify the types of species, populations, and life stages most vulnerable to impact or prone to conservation efforts. We have found substantial variation in vegetative and sexual reproduction between study populations for several rare plants, including between populations that vary in putative impact by development and/or effects of experimental solar arrays. For a subset of species, we designed population viability analysis and applied them to identify sensitive vital rates and compare quasi-extinction probabilities under different climate and impact scenarios. By utilizing practical experiments to test for the effects of real or simulated impacts, we found differences in vital rates between natural and disturbed populations adjacent to and within solar installations. We draw conclusions from our work to guide the analysis of benefits, permitting, and design of utility-scale solar energy facilities.

  9. Study on Biological Characteristics and Anatomical Structure of Leaf and Stem of Dictamnus dasycarpus Turcz%北药白鲜生物学特征及茎叶解剖结构观察

    Institute of Scientific and Technical Information of China (English)

    王立凤; 纪春艳; 李然红; 于爽; 柴军红; 陈子沅

    2012-01-01

    [Objective] To study the biological characteristics and anatomical structure of leaf and stem of Dictamnus dasycarpus Turcz. [ Method] The anatomical structure of leaf and steam of D, dasycarpus was studied by the method of paraffin sectioning. [ Result] The stem of Dictamnus dasycarpus Turcz consisted of epidermis, cortex and vascular cylinder. The cortex was composed by collenchyma and parenchyma tissue. The vascular cylinder was arranged as a ring, which from outside to inside were phloem and xylem. The leaf was typical bifacial leaf which consisted of epidermis, mesophyll and vascular cylinder. The epidermal cells were arranged regularly. The mesophyll consisted of palisade tissue and spongy tissue differentiation. [Conclusion] The method well studied the biological characteristics of Dictamnus dasycarpus Turcz and observed their anatomical structure.%[目的]研究北药白鲜的生物学特征并观察其茎叶的解剖结构.[方法]采用石蜡制片的方法研究北药白鲜的茎叶解剖结构特征.[结果]白鲜的茎由表皮、皮层和维管柱3部分组成,皮层由厚角组织和薄壁组织构成,维管束环状排列,由外到内依次是韧皮部和木质部.叶片为典型的异叶面,由表皮、叶肉及维管束构成,表皮细胞排列规则,叶肉分为栅栏组织和海绵组织,分化明显.[结论]该方法研究了北药白鲜的生物学特征,并观察其茎叶的解剖结构,效果良好.

  10. Potassium chloride and rare earth elements improve plant growth and increase the frequency of the Agrobacterium tumefaciens-mediated plant transformation.

    Science.gov (United States)

    Boyko, Alex; Matsuoka, Aki; Kovalchuk, Igor

    2011-04-01

    Plant transformation efficiency depends on the ability of the transgene to successfully interact with plant host factors. Our previous work and the work of others showed that manipulation of the activity of host factors allows for increased frequency of transformation. Recently we reported that exposure of tobacco plants to increased concentrations of ammonium nitrate increases the frequency of both homologous recombination and plant transgenesis. Here we tested the influence of KCl and salts of rare earth elements, Ce and La on the efficiency of Agrobacterium-mediated plant transformation. We found that exposure to KCl, CeCl(3) and LaCl(3) leads to an increase in recombination frequency in Arabidopsis and tobacco. Plants grown in the presence of CeCl(3) and LaCl(3) had higher biomass, longer roots and greater root number. Analysis of transformation efficiency showed that exposure of tobacco plants to 50 mM KCl resulted in ~6.0-fold increase in the number of regenerated calli and transgenic plants as compared to control plants. Exposure to various concentrations of CeCl(3) showed a maximum increase of ~3.0-fold in both the number of calli and transgenic plants. Segregation analysis showed that exposure to KCl and cerium (III) chloride leads to more frequent integrations of the transgene at a single locus. Analysis of transgene intactness showed better preservation of right T-DNA border during transgene integration. Our data suggest that KCl and CeCl(3) can be effectively used to improve quantity and quality of transgene integrations.

  11. Who’s eating the flowers of a rare western Nevada range plant?

    Science.gov (United States)

    Churchill Narrows buckwheat (Eriogonum diatomaceum) is an edaphic endemic plant that occurs only on diatomaceous soils on the northeastern flanks of the Pine Nut Mountains, Lyon Co., NV. The plant is listed by the State of Nevada as a sensitive species, and is on a priority list for listing under th...

  12. Baseline survey for rare plant species and native plant communities within the Kamehameha Schools 'Lupea Safe Harbor Planning Project Area, North Kona District, Island of Hawai'i

    Science.gov (United States)

    Jacobi, James; F. R. Warshauer, frwvolcano@hotmail.com; Jonathan Price, jpprice@hawaii.edu

    2010-01-01

    Kamehameha Schools, in conjunction with several federal, state, and private organizations, has proposed to conduct conservation management on approximately 5,340 ha (~13,200 acres) of land they own in the vicinity of Kīpukalupea in the North Kona District on the island of Hawai'i. The goal of this program is to restore and enhance the habitat to benefit native plant and animal populations that are currently, or were formerly, found in this site. The initial phase of this project has been focused on various activities including conducting baseline surveys for bird and plant species so Kamehameha Schools could develop a Safe Harbor Agreement (SHA) for the proposed project lands relative to the habitat management and species reintroduction efforts they would like to conduct in the Lupea Project area. This report summarizes methods that were used to collect field data on plant species and communities within the project area, and the results of that initial survey. The information was used to calculate baseline values for all listed threatened or endangered plant species found, or expected to be found, within the project area, and to design a monitoring program to assess changes in plant communities and rare plant species relative to management activities over the duration of the SHA.

  13. Assessment of phylogenetic relationship of rare plant species collected from Saudi Arabia using internal transcribed spacer sequences of nuclear ribosomal DNA.

    Science.gov (United States)

    Al-Qurainy, F; Khan, S; Nadeem, M; Tarroum, M; Alaklabi, A

    2013-03-11

    The rare and endangered plants of any country are important genetic resources that often require urgent conservation measures. Assessment of phylogenetic relationships and evaluation of genetic diversity is very important prior to implementation of conservation strategies for saving rare and endangered plant species. We used internal transcribed spacer sequences of nuclear ribosomal DNA for the evaluation of sequence identity from the available taxa in the GenBank database by using the Basic Local Alignment Search Tool (BLAST). Two rare plant species viz, Heliotropium strigosum claded with H. pilosum (98% branch support) and Pancratium tortuosum claded with P. tenuifolium (61% branch support) clearly. However, some species, viz Scadoxus multiflorus, Commiphora myrrha and Senecio hadiensis showed close relationships with more than one species. We conclude that nuclear ribosomal internal transcribed spacer sequences are useful markers for phylogenetic study of these rare plant species in Saudi Arabia.

  14. Plant species on the Department of Energy-Oak Ridge Reservation that are rare, threatened, or of special concern

    Energy Technology Data Exchange (ETDEWEB)

    Parr, P. D.; Taylor, Jr., F. G.

    1978-03-01

    The need to protect endangered organisms has gained increased awareness during the past decade. These efforts have only recently been expanded to include plants. Lists of candidate species have been compiled for review and status designation by appropriate governmental actions. The Report on Endangered and Threatened Plant Species of the United States presented to Congress by the Secretary of the Smithsonian Institution (U.S. Congress 1975) recommended that the preservation of critical habitats be adopted as a major management practice to ensure the survival of endangered and threatened plant species. In compliance with federal guidelines, plants occurring on the Department of Energy (DOE) Oak Ridge Reservation that are considered rare, threatened, or of special concern have been located, identified, and provided protection (Oak Ridge Operations 1975). At present nine candidate species are known to occur on the area. Efforts are being made to locate additional species that have been casually observed and reported but not verified by voucher specimens. The purpose of this activity is to summarize present knowledge of the occurrence and distribution of threatened and endangered plant species for long-range management decisions of the DOE-Oak Ridge Reservation.

  15. In search for key biogeochemical factors affecting plant species persistence in heathland and acidic grasslands : a comparison of common and rare species

    NARCIS (Netherlands)

    Kleijn, David; Bekker, Renee M.; Bobbink, Roland; De Graaf, Maaike C. C.; Roelofs, Jan G. M.

    2008-01-01

    1. During the last century, many plant species typical of heathland and nutrient-poor acidic grasslands have become rare whereas others have remained common. Habitat restoration often fails to enhance the rare species, which may in part be caused by the failure to restore the biogeochemical conditio

  16. Identification and Management of Multiple Threats to Rare and Endangered Plant Species

    Science.gov (United States)

    2013-07-30

    contract to the Department of Defense Strategic Environmental Research and Development Program (SERDP). The publication of this report does not indicate...30 July 2013 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER W912H08-c-0002 Identification and Management of Multiple Threats to Rare...of Acronyms GLM Generalized Linear Model GLMM Generalized Mixed Linear Model LM Linear Model LTRE Life table response experiment MLM Mixed

  17. Status and limiting factors of two rare plant species in dry montane communities of Hawai`i Volcanoes National Park.

    Science.gov (United States)

    Pratt, Linda W.; VanDeMark, Joshua R.; Euaparadorn, Melody

    2012-01-01

    Two rare plants native to montane dry forests and woodland communities of Hawai`i Volcanoes National Park (HAVO) were studied for more than two years to determine their stand structure, short-term mortality rates, patterns of reproductive phenology, success of fruit production, floral visitor composition, seed germination rates in the greenhouse, and survival of both natural and planted seedlings. Phyllostegia stachyoides, a shrubby Hawaiian mint (Lamiaceae) that is a species of concern, was studied within two small kīpuka at a natural population on the park’s Mauna Loa Strip, and three plantings at sites along the Mauna Loa Road were also monitored. Silene hawaiiensis, a threatened shrub species in the pink family (Caryophyllaceae), was monitored at two natural populations, one on Mauna Loa at the Three Trees Kīpuka and the second on Kīlauea Crater Rim south of Halema`uma`u. Silene hawaiiensis plantings were also made inside and outside ungulate exclosures at the park’s Kahuku Unit

  18. Portfolio effects, climate change, and the persistence of small populations: analyses on the rare plant Saussurea weberi.

    Science.gov (United States)

    Abbott, Ronald E; Doak, Daniel F; Peterson, Megan L

    2017-04-01

    The mechanisms that stabilize small populations in the face of environmental variation are crucial to their long-term persistence. Building from diversity-stability concepts in community ecology, within-population diversity is gaining attention as an important component of population stability. Genetic and microhabitat variation within populations can generate diverse responses to common environmental fluctuations, dampening temporal variability across the population as a whole through portfolio effects. Yet, the potential for portfolio effects to operate at small scales within populations or to change with systematic environmental shifts, such as climate change, remain largely unexplored. We tracked the abundance of a rare alpine perennial plant, Saussurea weberi, in 49 1-m(2) plots within a single population over 20 yr. We estimated among-plot correlations in log annual growth rate to test for population-level synchrony and quantify portfolio effects across the 20-yr study period and also in 5-yr subsets based on June temperature quartiles. Asynchrony among plots, due to different plot-level responses to June temperature, reduced overall fluctuations in abundance and the probability of decline in population models, even when accounting for the effects of density dependence on dynamics. However, plots became more synchronous and portfolio effects decreased during the warmest years of the study, suggesting that future climate warming may erode stabilizing mechanisms in populations of this rare plant.

  19. Iris glaucescens Bunge (Iridaceae, the rare flag of the Siberian plant kingdom

    Directory of Open Access Journals (Sweden)

    Alexeeva Nina Borisovna

    2015-12-01

    The work was performed in the framework of an institutional research project of the Komarov Botanical Institute of the Russian Academy of Sciences, topic 52.5. Collection of live plants of the Komarov Botanical Institute of the Russian Academy of Sciences (history, present condition, development and use prospects.

  20. Simulating direct and indirect effects of climatic changes on rare perennial plant species in fragmented landscapes

    NARCIS (Netherlands)

    Korner, K.; Treydte, A.C.; Burkart, M.; Jeltsch, F.

    2010-01-01

    Question: How does climate change influence plant species population dynamics, their time to extinction, and proportion of occupied habitats in a fragmented landscape? Location: Germany and Central European lowland. Methods: We apply a mechanistic general simulation model to test the response of

  1. Rare & Endangered Species: Understanding Our Disappearing Plants and Animals. Activities Guide.

    Science.gov (United States)

    American Gas Association, Arlington, VA. Educational Services.

    About 464 plants and animals found in the United States and its territories are listed by the U.S. Fish and Wildlife Service as threatened or endangered. Another 3900 are candidates for protection. The activities in this guide are designed to help teachers and students understand the issue of endangered species. It includes ideas for several…

  2. Using a network modularity analysis to inform management of a rare endemic plant in the northern Great Plains, USA

    Science.gov (United States)

    Larson, Diane L.; Droege, Sam; Rabie, Paul A.; Larson, Jennifer L.; Devalez, Jelle; Haar, Milton; McDermott-Kubeczko, Margaret

    2014-01-01

    1. Analyses of flower-visitor interaction networks allow application of community-level information to conservation problems, but management recommendations that ensue from such analyses are not well characterized. Results of modularity analyses, which detect groups of species (modules) that interact more with each other than with species outside their module, may be particularly applicable to management concerns. 2. We conducted modularity analyses of networks surrounding a rare endemic annual plant, Eriogonum visheri, at Badlands National Park, USA, in 2010 and 2011. Plant species visited were determined by pollen on insect bodies and by flower species upon which insects were captured. Roles within modules (network hub, module hub, connector and peripheral, in decreasing order of network structural importance) were determined for each species. 3. Relationships demonstrated by the modularity analysis, in concert with knowledge of pollen species carried by insects, allowed us to infer effects of two invasive species on E. visheri. Sharing a module increased risk of interspecific pollen transfer to E. visheri. Control of invasive Salsola tragus, which shared a module with E. visheri, is therefore a prudent management objective, but lack of control of invasive Melilotus officinalis, which occupied a different module, is unlikely to negatively affect pollination of E. visheri. Eriogonum pauciflorum may occupy a key position in this network, supporting insects from the E. visheri module when E. visheri is less abundant. 4. Year-to-year variation in species' roles suggests management decisions must be based on observations over several years. Information on pollen deposition on stigmas would greatly strengthen inferences made from the modularity analysis. 5. Synthesis and applications: Assessing the consequences of pollination, whether at the community or individual level, is inherently time-consuming. A trade-off exists: rather than an estimate of fitness effects, the

  3. Rare and Endemic Plants in the Southern Mountain Ecosystems of Albania, their Threats and Diversity

    Directory of Open Access Journals (Sweden)

    ERMELINDA MAHMUTAJ

    2015-03-01

    Full Text Available The study highlights flora and vegetation richness in the mountain ecosystems in Southern Albania, focusing mainly on Çika, Këndërvica, and Tomorri Mts. The data are collected in more than 100 relevés during field trips, carried out in periods of intensive vegetation. It shows the presence of 11 endemic taxa, 23 nearendemics and more than 60 Balkan endemics. Two new species for science are described recently (Gymnospermium maloi Kit Tan & Shuka and Campanula aureliana Bogdanović, Rešetnik, Brullo & Shuka and some others are confirmed about 100 years after (Sesleria albanica Ujhelyi and Stachys sericophylla Halacsy. Main threats, especially for the endemics and rare taxa of the southern region of Albania, are presented in this study, with recommendations for future steps. Some Natura2000 habitats are identified and a relevance of different habitat types like EUNIS, and Syntaxonomic classifications are linked together. The main aim of this study was the identification and presentation of floristic and vegetation values of this wide natural ecosystem and putting them into the function of science. The results indicate the area as the richest in the country, due to the insignificant influence of human factor and diversity of climate and terrestrial elements.

  4. Remedial actions at the former Vitro Rare Metals plant site, Canonsburg, Washington County, Pennsylvania. Final Environmental Impact Statement. Volume I

    Energy Technology Data Exchange (ETDEWEB)

    1983-07-01

    The environmental impacts associated with remedial actions in connection with residual radioactive materials remaining at the inactive uranium processing site located in Canonsburg, Washington County, Pennsylvania are evaluated. The Canonsburg site is an 18.5-acre property that was formerly owned by the Vitro Rare Metals Company. The expanded Canonsburg site would be 30-acre property that would include the Canonsburg site (the former Vitro Rare Metals plant), seven adjacent private houses, and the former Georges Pottery property. During the period 1942 through 1957 the Vitro Manufacturing Company and its successor, the Vitro Corporation of America, processed onsite residues and ores, and government-owned ores, concentrates, and scraps to extract uranium and other rare metals. The Canonsburg site is now the Canon Industrial Park. In addition to storing the residual radioactive materials of this process at the Canonsburg site, about 12,000 tons of radioactively contaminated materials were transferred to a railroad landfill in Burrell Township, Indiana County, Pennsylvania. This Canonsburg FEIS evaluates five alternatives for removing the potential public health hazard associated with the radioactively contaminated materials. In addition to no action, these alternatives involve various combinations of stabilization of the radioactively contaminated materials in place or decontamination of the Canonsburg and Burrell sites by removing the radioactively contaminated materials to another location. In addition to the two sites mentioned, a third site located in Hanover Township, Washington County, Pennsylvania has been considered as a disposal site to which the radioactively contaminated materials presently located at either of the other two sites might be moved.

  5. Effect of rare earth application on the growth of Trichoderma spp.and several plant pathogenic fungi

    Institute of Scientific and Technical Information of China (English)

    d'Aquino L; Carboni M; Woo S L; Morgana M; Nardi L; Lorito M

    2004-01-01

    @@ Rare earth elements (REEs) enriched fertilisers are currently used in China for soil and foliar applications to crops, but little is known about the effect of REEs applications on the growth of beneficial and detrimental soilborne microorganisms. The growth of biological control agents Trichoderma atroviride strain P1, Trichoderma harzianum strain A6 and strain T22, plant pathogens Botrytis cinerea, Alternaria alternata, Fusarium solani, Rhizoctonia solani and Sclerotinia sclerotiorum was investigated in the presence of REEs. An in vitro assays was used to monitor the effect of different concentration levels of either a mix of REEs (La, Ce, Pr, Nd) nitrates or lanthanum alone in comparison to treatments conducted with potassium nitrate and water. Although all fungi were affected when the REEs mix or lanthanum were present at concentrations higher than 100 mM, the growth inhibition depended mainly upon the combination of compounds, the dose and the fungal species or strains tested. Trichoderma strains and B. cinerea were more sensitive than A.alternata, F. solani, R. solani or at higher concentrations. Differing growth responses of some fungi to treatments with REEs mix vs. lanthanum alone indicated that in given situations the effect of the REEs compounds may be caused by elements other than lanthanum or by element mixtures.Further investigations are in progress to determine the effect of REEs on important interactions in the soil community between beneficial fungi, pathogenic fungi and/or the plant. REEs are naturally present in the environment and in biological systems but accumulation in soil can take place following successive applications. Therefore, it would be useful to achieve a better understanding of the effect of REEs accumulation on the activity of rhizosphere microorganisms given the widespread use in some regions of rare earths as fertilizers and their presence as fertilizer contaminants.

  6. Lawrence Livermore National Laboratory Pre-project Rare Plant and Wildlife Surveys For the Pit 7 Drainage Diversion and Groundwater Extraction and Treatment Facility

    Energy Technology Data Exchange (ETDEWEB)

    Paterson, L; Woollett, J

    2007-07-17

    In January 2007, the Department of Energy (DOE) released the final Environmental Assessment for the Proposed Environmental Remediation at the Lawrence Livermore National Laboratory (LLNL) Site 300 Pit 7 Complex. At the same time, the Department of Toxic Substances Control (DTSC) released the final Negative Declaration and Initial Study covering the Pit 7 remediation. No substantial adverse effect on wildlife species of concern was anticipated from the project. However, it was proposed that wildlife surveys should be conducted prior to construction because species locations and breeding areas could potentially change by the time construction activities began. Although no known populations of rare or endangered/threatened plant species were known to occur within the project impact area at the time these documents were released, rare plants listed by the California Native Plant Society had been observed in the vicinity. As such, both DOE and DTSC proposed that plant surveys would be undertaken at the appropriate time of year to determine if rare plants would be impacted by project construction. This document provides the results of wildlife and rare plant surveys taken prior to the start of construction at the Pit 7 Complex.

  7. Fractionation of Rare Earth Elements in Plants Ⅰ. Fractionation Patterns and Their Forming Mechanisms in Different Organs of Triticum Aestivum

    Institute of Scientific and Technical Information of China (English)

    Liang Tao; Ding Shiming; Zhang Chaosheng; Zhang Zili; Yan Juncai; Li Haitao

    2005-01-01

    Fractionations of rare earth elements (REEs) and the forming mechanisms in plants were studied using Triticum aestivum as plant material with application of exogenous REEs and hydroponic culture. REEs were significantly fractionated in different parts of Triticum aestivum. M-type tetrad effect could be observed in both root and shoot of Triticum aestivum, which might result from the different abilities of REEs to form phosphate precipitation. Middle REEs (MREEs), light REEs (LREEs) and heavy REEs (HREEs) were enriched in root, stem and leaf of Triticum aestivum, respectively. REE speciation calculations using VMINTEQ program show REEs in simulated xylem solution mainly exist as REE-EDTA- and RE3+, but only HREEs are enriched in REE-EDTA-, while LREEs are enriched in the other REE species. It is suggested that the fractionation between LREEs and HREEs might be caused by the uptake of REE-EDTA- in Triticum aestivum leaves, but might result from the uptake of the other REE species in their stems.

  8. Do David and Goliath Play the Same Game? Explanation of the Abundance of Rare and Frequent Invasive Alien Plants in Urban Woodlands in Warsaw, Poland

    Science.gov (United States)

    Mędrzycki, Piotr; Kołaczkowska, Ewa; Ciurzycki, Wojciech; Marciszewska, Katarzyna

    2016-01-01

    Invasive Alien Plants occur in numbers differing by orders of magnitude at subsequent invasion stages. Effective sampling and quantifying niches of rare invasive plants are quite problematic. The aim of this paper is an estimation of the influence of invasive plants frequency on the explanation of their local abundance. We attempted to achieve it through: (1) assessment of occurrence of self-regenerating invasive plants in urban woodlands, (2) comparison of Random Forest modelling results for frequent and rare species. We hypothesized that the abundance of frequent species would be explained better than that of rare ones and that both rare and frequent species share a common hierarchy of the most important determinants. We found 15 taxa in almost two thirds of 1040 plots with a total number of 1068 occurrences. There were recorded 6 taxa of high frequency–Prunus serotina, Quercus rubra, Acer negundo, Robinia pseudoacacia, Impatiens parviflora and Solidago spp.–and 9 taxa of low frequency: Acer saccharinum, Amelanchier spicata, Cornus spp., Fraxinus spp., Parthenocissus spp., Syringa vulgaris, Echinocystis lobata, Helianthus tuberosus, Reynoutria spp. Random Forest’s models’ quality grows with the number of occurrences of frequent taxa but not of the rare ones. Both frequent and rare taxa share a similar hierarchy of predictors’ importance: Land use > Tree stand > Seed source and, for frequent taxa, Forest properties as well. We conclude that there is an ‘explanation jump’ at higher species frequencies, but rare species are surprisingly similar to frequent ones in their determinant’s hierarchy, with differences conforming with their respective stages of invasion. PMID:27992516

  9. Occurrence of morphological and anatomical adaptive traits in young and adult plants of the rare Mediterranean cliff species Primula palinuri Petagna.

    Science.gov (United States)

    De Micco, Veronica; Aronne, Giovanna

    2012-01-01

    Cliffs worldwide are known to be reservoirs of relict biodiversity. Despite the presence of harsh abiotic conditions, large endemic floras live in such environments. Primula palinuri Petagna is a rare endemic plant species, surviving on cliff sites along a few kilometres of the Tyrrhenian coast in southern Italy. This species is declared at risk of extinction due to human impact on the coastal areas in question. Population surveys have shown that most of the plants are old individuals, while seedlings and plants at early stages of development are rare. We followed the growth of P. palinuri plants from seed germination to the adult phase and analysed the morphoanatomical traits of plants at all stages of development. Our results showed that the pressure of cliff environmental factors has been selected for seasonal habitus and structural adaptive traits in this species. The main morphoanatomical modifications are suberized cell layers and accumulation of phenolic compounds in cell structures. These features are strictly related to regulation of water uptake and storage as well as defence from predation. However, we found them well established only in adult plants and not in juvenile individuals. These findings contribute to explain the rare recruitment of the present relict populations, identifying some of the biological traits which result in species vulnerability.

  10. [Rare earth elements content in farmland soils and crops of the surrounding copper mining and smelting plant in Jiangxi province and evaluation of its ecological risk].

    Science.gov (United States)

    Jin, Shu-Lan; Huang, Yi-Zong; Wang, Fei; Xu, Feng; Wang, Xiao-Ling; Gao, Zhu; Hu, Ying; Qiao Min; Li, Jin; Xiang, Meng

    2015-03-01

    Rare earth elements content in farmland soils and crops of the surrounding copper mining and smelting plant in Jiangxi province was studied. The results showed that copper mining and smelting could increase the content of rare earth elements in soils and crops. Rare earth elements content in farmland soils of the surrounding Yinshan Lead Zinc Copper Mine and Guixi Smelting Plant varied from 112.42 to 397.02 mg x kg(-1) and 48.81 to 250.06 mg x kg(-1), and the average content was 254.84 mg x kg(-1) and 144.21 mg x kg(-1), respectively. The average contents of rare earth elements in soils in these two areas were 1.21 times and 0.68 times of the background value in Jiangxi province, 1.36 times and 0.77 times of the domestic background value, 3.59 times and 2.03 times of the control samples, respectively. Rare earth elements content in 10 crops of the surrounding Guixi Smelting Plant varied from 0.35 to 2.87 mg x kg(-1). The contents of rare earth elements in the leaves of crops were higher than those in stem and root. The contents of rare earth elements in Tomato, lettuce leaves and radish leaves were respectively 2.87 mg x kg(-1), 1.58 mg x kg(-1) and 0.80 mg x kg(-1), which were well above the hygienic standard limit of rare earth elements in vegetables and fruits (0.70 mg x kg(-1)). According to the health risk assessment method recommended by America Environmental Protection Bureau (USEPA), we found that the residents' lifelong average daily intake of rare earth elements was 17.72 mg x (kg x d)(-1), lower than the critical value of rare earth elements damage to human health. The results suggested that people must pay attention to the impact of rare earth elements on the surrounding environment when they mine and smelt copper ore in Jiangxi.

  11. Research of rare&endangered plants and key protected plants in Jiangxi Lingyunshan Provincial Nature Reserve%江西凌云山自然保护区珍稀濒危保护植物研究

    Institute of Scientific and Technical Information of China (English)

    季春峰; 裘利洪; 杨清培; 施建敏; 揭正平; 曾祥明

    2015-01-01

    Based on field survey, the floristic characteristics of rare & endangered plants and key protected plants in Lingyunshan Nature Reserve were studied. The results indicated that there are 79 rare & endangered plants and key protected plants in the reserve which belong to 61 genera and 40 families, including 10 species of national key protected plants, 6 species in the International Union for Conservation of Nature (IUCN) Red List, 29 species in China Species Red List (CSRL), 10 species in the Convention on International Trade in Endangered Species (CITES), and 57 species of Jiangxi key protected plants. The flora characteristics of rare and endangered plants in nature area were analyzed, and several protection suggestions were put forward.%调查表明凌云山自然保护区共有珍稀濒危植物79种,隶属于40科61属,其中国家重点保护植物有10种,IUCN保护植物共有6种,中国物种红色名录物种(CSRL)有29种,CITES名录附录Ⅱ物种有10种,江西省重点保护植物57种. 分析了保护区珍稀濒危植物区系特征,针对所受威胁提出了保护建议.

  12. [Clonal micropropagation of a rare species Hedysarum theinum Krasnob (Fabaceae) and assessment of the genetic stability of regenerated plants using ISSR markers].

    Science.gov (United States)

    Erst, A A; Svyagina, N S; Novikova, T I; Dorogina, O V

    2015-02-01

    In the present study, a protocol was developed for the in vitro propagation of a rare medicinal plant, Hedysarum theinum (tea sweetvetch), from axillary buds, and identification of the regenerants was performed with the use of ISSR markers. It was demonstrated that Gamborg and Eveleigh medium supplemented with 5 μM 6-benzylaminopurine was the best for H. theinum for initial multiplication. On the other hand, half-strength Murashige and Skoog (MS) basal medium supplemented with 7 μM α-naphthaleneacetic acid proved to be the best for explant rooting. Molecular genetic analysis of the H. theinum mother plants and the obtained regenerants was performed with six ISSR markers. Depending on the primer, four to ten amplified fragments with sizes ranging from 250 to 3000 bp were identified. Our results confirmed the genetic stability of regenerants obtained in five passages and their identity to the mother plant.

  13. How to Cope with the Rare Human Error Events Involved with organizational Factors in Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Sa Kil; Luo, Meiling; Lee, Yong Hee [Korea Atomic Research Institute, Daejeon (Korea, Republic of)

    2014-10-15

    The current human error guidelines (e.g. US DOD handbooks, US NRC Guidelines) are representative tools to prevent human errors. These tools, however, have limits that they do not adapt all operating situations and circumstances such as design base events. In other words, these tools are only adapted foreseeable standardized operating situations and circumstances. In this study, our research team proposed an evidence-based approach such as UK's safety case to coping with the rare human error events such as TMI, Chernobyl, Fukushima accidents. These accidents are representative events involved with rare human errors. Our research team defined the 'rare human errors' as the follow three characterized events; Extremely low frequency Extremely high complicated structure Extremely serious damage of human life and property A safety case is a structured argument, supported by evidence, intended to justify that a system is acceptably safe. The definition by UK defense standard 00-56 issue 4 states that such an evidence-based approach can be contrast with a prescriptive approach to safety certification, which require safety to be justified using a prescribed process. Safety managements and safety regulatory activities based on safety case are effective to control organizational factors in terms of integrated safety management. Especially safety issues relevant with public acceptance are useful to provide practical evidences to the public reasonably. European Union including UK has developed the concept of engineered safety management system to deal with public acceptance using the safety case. In Korea nuclear industry, the Korean Atomic Research Institute has firstly performed a basic research to adapt the safety case in the field of radioactive waste according to the IAEA SSG-23(KAERI/TR-4497, 4531). Excepting the radioactive waste, there is no try to adapt the safety case yet. Most incidents and accidents involved human during operating NPPs have a tendency

  14. Development of an efficient callus proliferation system for Rheum coreanum Nakai, a rare medicinal plant growing in Democratic People’s Republic of Korea

    Directory of Open Access Journals (Sweden)

    Song-Chol Mun

    2016-07-01

    Full Text Available A clonal mass propagation to obtain mountainous sources of Rheum coreanum Nakai, a rare medicinal plant in Democratic People’s Republic of Korea was established by rhizome tissue culture. Whole plants were selected and collected as a vigorous individual free from blights and harmful insects among wild plants of R. coreanum grown on the top of Mt. Langrim (1.540 m above the sea situated at the northern extremity of Democratic People’s Republic of Korea. Induction of the callus was determined using four organs separated from the whole plant and different plant growth regulators. The callus was successfully induced from rhizome explant on MS medium containing 2.4-D (0.2–0.3 mg/l. In the MS medium supplemented with a combination of BAP (2 mg/l and NAA (0.2 mg/l, single NAA (0.5 mg/l, or IBA (0.5 mg/l, a higher number of shoot, root and plantlets was achieved. The survival rate on the mountainous region of the plantlets successfully acclimatized (100% in greenhouse reached 95%, and yields of crude drug and contents of active principles were higher than those obtained by sexual and vegetative propagation. This first report of R. coreanum tissue culture provides an opportunity to control extinction threats and an efficient callus proliferation system for growing resources rapidly on a large scale.

  15. Development of an efficient callus proliferation system for Rheum coreanum Nakai, a rare medicinal plant growing in Democratic People's Republic of Korea.

    Science.gov (United States)

    Mun, Song-Chol; Mun, Gwan-Sim

    2016-07-01

    A clonal mass propagation to obtain mountainous sources of Rheum coreanum Nakai, a rare medicinal plant in Democratic People's Republic of Korea was established by rhizome tissue culture. Whole plants were selected and collected as a vigorous individual free from blights and harmful insects among wild plants of R. coreanum grown on the top of Mt. Langrim (1.540 m above the sea) situated at the northern extremity of Democratic People's Republic of Korea. Induction of the callus was determined using four organs separated from the whole plant and different plant growth regulators. The callus was successfully induced from rhizome explant on MS medium containing 2.4-D (0.2-0.3 mg/l). In the MS medium supplemented with a combination of BAP (2 mg/l) and NAA (0.2 mg/l), single NAA (0.5 mg/l), or IBA (0.5 mg/l), a higher number of shoot, root and plantlets was achieved. The survival rate on the mountainous region of the plantlets successfully acclimatized (100%) in greenhouse reached 95%, and yields of crude drug and contents of active principles were higher than those obtained by sexual and vegetative propagation. This first report of R. coreanum tissue culture provides an opportunity to control extinction threats and an efficient callus proliferation system for growing resources rapidly on a large scale.

  16. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    @@ February, 2010 Rare earth separation plants and downstream producers like NdFeB magnetic materials and phosphor materials successively ceased production due to Spring Festival, Chinese New Year. Transactions in rare earth market were few affected by public holidays.

  17. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Rare earth market fluctuated slightly recently and the transactions remained sluggish. Environment control was strengthened in southern China and many rare earth plants had gone out of production. Some traders were considering selling commodities at low p

  18. An Inventory of Rare and Endangered Plant Species Found in the St. Louis, Missouri, Corps of Engineers District.

    Science.gov (United States)

    1976-06-01

    Illinois: Lilies to Orchids. Southern Illinois University Press, 288 pp. Mohlenbrock, R. H. 1972. The Illustrated Flora of Illinois: Grasses . Bromus to... Paspalum . Southern lllinois Univer- sity Press, 332 pp. Mohlenbrock, R. H. 1973. The Illustrated Flora of Illinois: Grasses . Panicum to Danthonia...species is known from three Missouri counties. T 34 RALLS (MO). Ruppia maritima L. var. rostrata Agardh Ditch Grass Classification: Missouri: Rare

  19. Rare and endangered plants in Mount Jinggangshan region%井冈山地区珍稀濒危植物及其生存状况

    Institute of Scientific and Technical Information of China (English)

    王蕾; 施诗; 廖文波; 陈春泉; 李贞

    2013-01-01

    The occurrence of rare, endangered, and protected plant species is of importance in assessing the status of local biodiversity and the environment as well as developing strategies for nature conservation and management. The abundance and distribution of rare and endangered plants in the Mount Jinggangshan region were investigated as well as the community characteristics of important woody species. The results demonstrate that rare and endangered species have high conservation value and significant importance in systematics and biogeography. This area contains two endangered bryophyte species and 199 species of vascular plants. Among them, 50 species are included in the IUCN Red List of Threatened species, 160 species in the China Species Red List, 49 species in the List of Wild Plants Under State Protection (First Batch), and 90 species in the Appendices of CITES. The variety and abundance of rare and endangered species in this area are equivalent to those for Mount Emei and higher than those for Mount Wuyi and Mount Taibai. Many perfectly preserved communities, covering a large area, exist in the Mount Jinggangshan vicinity, and are dominated by rare and endangered species, such as Abies beshanzuensis var. ziyuanensis, Corylus chinensis, Pseudotaxus chienii, Taxus wallichiana var. mairei, Fokienia hodginsii, Amentotaxus argotaenia, Phoebe bournei, Pieris japonica, Rhododendron jinggangshanicum, etc. The communities where some important rare and endangered plants occur are described in detail and suggestions are made for their protection.%开展国家珍稀濒危保护植物的考察、研究,对探讨区域生物多样性的性质、评价生态环境的状况和质量,提出适当的自然保护、管理对策等,均具有重要的指导意义.本文调查研究了井冈山地区珍稀濒危植物的种类、数量、分布、生长状况以及重要木本植物的群落特征,探讨了珍稀濒危植物的系统学与生物地理学特征.结果表明,井冈

  20. Post-disturbance plant community dynamics following a rare natural-origin fire in a Tsuga canadensis forest.

    Directory of Open Access Journals (Sweden)

    Bryan D Murray

    Full Text Available Opportunities to directly study infrequent forest disturbance events often lead to valuable information about vegetation dynamics. In mesic temperate forests of North America, stand-replacing crown fire occurs infrequently, with a return interval of 2000-3000 years. Rare chance events, however, may have profound impacts on the developmental trajectories of forest ecosystems. For example, it has been postulated that stand-replacing fire may have been an important factor in the establishment of eastern hemlock (Tsuga canadensis stands in the northern Great Lakes region. Nevertheless, experimental evidence linking hemlock regeneration to non-anthropogenic fire is limited. To clarify this potential relationship, we monitored vegetation dynamics following a rare lightning-origin crown fire in a Wisconsin hemlock-hardwood forest. We also studied vegetation in bulldozer-created fire breaks and adjacent undisturbed forest. Our results indicate that hemlock establishment was rare in the burned area but moderately common in the scarified bulldozer lines compared to the reference area. Early-successional, non-arboreal species including Rubus spp., Vaccinium angustifolium, sedges (Carex spp., grasses, Epilobium ciliatum, and Pteridium aquilinium were the most abundant post-fire species. Collectively, our results suggest that competing vegetation and moisture stress resulting from drought may reduce the efficacy of scarification treatments as well as the usefulness of fire for preparing a suitable seedbed for hemlock. The increasing prevalence of growing-season drought suggests that silvicultural strategies based on historic disturbance regimes may need to be reevaluated for mesic species.

  1. Development of an efficient in vitro propagation protocol for Satureja punctata - A rare aromatic and medicinal plant

    Directory of Open Access Journals (Sweden)

    Indrias Teshome

    2016-03-01

    Full Text Available Satureja punctata is an important aromatic and medicinal plant in Lamiaceae family. This plant is threatened mainly due to overgrazing, deforestation, over harvesting of the whole plant for medicinal purpose. This study was aimed to develop an efficient in vitro propagation protocol for S. punctata using shoot tips. Shoots excised from in vitro germinated seedlings were used as mother plant for culture induction on MS medium supplemented with different concentrations of 6-benzyl amino purine (BAP and Kinetin (KIN. Highest shoot induction frequency (100% with highest mean number (8.25±1.64 of shoot per explant was obtained at 0.5 mg/L BAP. In multiplication media, among different concentrations of BAP, KIN, BAP×KIN and KIN×NAA (α-Naphthalene acetic acid, BAP × NAA found to be an optimum concentration with (26.20±2.71 mean number of shoots. The best shoot height (2.48 ± 0.13 cm was achieved on growth regulators free medium, which was used as control. Half strength MS medium containing different concentrations of Indole-3- butyric acid (IBA, Indole-3-acetic acid (IAA and NAA were used for root induction. The highest rooting percentage (100%, root number (5.90±0.48 and root length (1.55±0.11 cm were attained in the presence of 1.0 mg/L IBA. Up on acclimatization, 97.5% survived plants were recorded. The results demonstrated that, this study was very important for mass propagation and ultimate conservation of this valuable plant.

  2. Limiting factors of four rare plant species in `Ōla`A Forest of Hawai'i Volcanoes National Park

    Science.gov (United States)

    VanDeMark, Joshua R.; Pratt, Linda W.; Euaparadorn, Melody

    2010-01-01

    Three endangered or candidate endangered plant species native to `Ōla`a Forest (Cyrtandra giffardii, ha`iwale; Phyllostegia floribunda, a mint with no common name; and Sicyos alba, `ānunu) were studied for more than 2 years to determine their stand structures, short-term mortality rates, patterns of reproductive phenology, success of fruit production, seed germination rates in the greenhouse, presence of soil seed bank, and survival of both natural and planted seedlings. The role of rodents as seed predators was evaluated for S. alba using seed offerings in open and closed stations. A 4th endangered species at a remote site in `Ōla`a (Cyrtandra tintinnabula) was visited to determine its stand structure and mortality rate.

  3. Thorium, uranium and rare earth elements content in lanthanide concentrate (LC) and water leach purification (WLP) residue of Lynas advanced materials plant (LAMP)

    Science.gov (United States)

    AL-Areqi, Wadeeah M.; Majid, Amran Ab.; Sarmani, Sukiman

    2014-02-01

    Lynas Advanced Materials Plant (LAMP) has been licensed to produce the rare earths elements since early 2013 in Malaysia. LAMP processes lanthanide concentrate (LC) to extract rare earth elements and subsequently produce large volumes of water leach purification (WLP) residue containing naturally occurring radioactive material (NORM). This residue has been rising up the environmental issue because it was suspected to accumulate thorium with significant activity concentration and has been classified as radioactive residue. The aim of this study is to determine Th-232, U-238 and rare earth elements in lanthanide concentrate (LC) and water leach purification (WLP) residue collected from LAMP and to evaluate the potential radiological impacts of the WLP residue on the environment. Instrumental Neutron Activation Analysis and γ-spectrometry were used for determination of Th, U and rare earth elements concentrations. The results of this study found that the concentration of Th in LC was 1289.7 ± 129 ppm (5274.9 ± 527.6Bq/kg) whereas the Th and U concentrations in WLP were determined to be 1952.9±17.6 ppm (7987.4 ± 71.9 Bq/kg) and 17.2 ± 2.4 ppm respectively. The concentrations of Th and U in LC and WLP samples determined by γ- spectrometry were 1156 ppm (4728 ± 22 Bq/kg) & 18.8 ppm and 1763.2 ppm (7211.4 Bq/kg) &29.97 ppm respectively. This study showed that thorium concentrations were higher in WLP compare to LC. This study also indicate that WLP residue has high radioactivity of 232Th compared to Malaysian soil natural background (63 - 110 Bq/kg) and come under preview of Act 304 and regulations. In LC, the Ce and Nd concentrations determined by INAA were 13.2 ± 0.6% and 4.7 ± 0.1% respectively whereas the concentrations of La, Ce, Nd and Sm in WLP were 0.36 ± 0.04%, 1.6%, 0.22% and 0.06% respectively. This result showed that some amount of rare earth had not been extracted and remained in the WLP and may be considered to be reextracted.

  4. Thorium, uranium and rare earth elements content in lanthanide concentrate (LC) and water leach purification (WLP) residue of Lynas advanced materials plant (LAMP)

    Energy Technology Data Exchange (ETDEWEB)

    AL-Areqi, Wadeeah M., E-mail: walareqi@yahoo.com; Majid, Amran Ab., E-mail: walareqi@yahoo.com; Sarmani, Sukiman, E-mail: walareqi@yahoo.com [Nuclear Science Programme, School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi (Malaysia)

    2014-02-12

    Lynas Advanced Materials Plant (LAMP) has been licensed to produce the rare earths elements since early 2013 in Malaysia. LAMP processes lanthanide concentrate (LC) to extract rare earth elements and subsequently produce large volumes of water leach purification (WLP) residue containing naturally occurring radioactive material (NORM). This residue has been rising up the environmental issue because it was suspected to accumulate thorium with significant activity concentration and has been classified as radioactive residue. The aim of this study is to determine Th-232, U-238 and rare earth elements in lanthanide concentrate (LC) and water leach purification (WLP) residue collected from LAMP and to evaluate the potential radiological impacts of the WLP residue on the environment. Instrumental Neutron Activation Analysis and γ-spectrometry were used for determination of Th, U and rare earth elements concentrations. The results of this study found that the concentration of Th in LC was 1289.7 ± 129 ppm (5274.9 ± 527.6Bq/kg) whereas the Th and U concentrations in WLP were determined to be 1952.9±17.6 ppm (7987.4 ± 71.9 Bq/kg) and 17.2 ± 2.4 ppm respectively. The concentrations of Th and U in LC and WLP samples determined by γ- spectrometry were 1156 ppm (4728 ± 22 Bq/kg) and 18.8 ppm and 1763.2 ppm (7211.4 Bq/kg) and 29.97 ppm respectively. This study showed that thorium concentrations were higher in WLP compare to LC. This study also indicate that WLP residue has high radioactivity of {sup 232}Th compared to Malaysian soil natural background (63 - 110 Bq/kg) and come under preview of Act 304 and regulations. In LC, the Ce and Nd concentrations determined by INAA were 13.2 ± 0.6% and 4.7 ± 0.1% respectively whereas the concentrations of La, Ce, Nd and Sm in WLP were 0.36 ± 0.04%, 1.6%, 0.22% and 0.06% respectively. This result showed that some amount of rare earth had not been extracted and remained in the WLP and may be considered to be reextracted.

  5. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    @@ Supply of rare earth concentrate remained tight recently. Rare earth market exhibited rising tendency holistically Affected by tight supply of rare earth concentrate, many plants were operated under the capacity. Supply of didymium oxide got tighter and the price was on rising.

  6. Floristic Characteristic of the Rare and Endangered Plants in Qiandongnan State%黔东南州珍稀濒危植物区系特征研究

    Institute of Scientific and Technical Information of China (English)

    冯邦贤; 王定江; 袁茂琴

    2012-01-01

    cording to Red Book of Plants in China(Vol.1) and National Important Wild Conservative Plants List(List 1),which were issued by the State Council in 1999,there are 32 families,51 genera,and 58 species of rare and endangered plants in Qiandongnan prefecture.In this paper,growth-type and floristic characteristics of these seed plants were reinvestigated and analyzed.The results showed that: 1)18 genera are of tropical and 18 genera are temperate,each accounting for 37.5% of the total generic number,showing obvious temperate floristic characteristics;2) 11 genera are endemic to China,accounting for 23.0% of the total,characterized by ancient origin and obvious endemism.%根据《中国植物红皮书》(第一册)和1999年国务院批准公布的《国家重点保护野生植物名录(第一批)》统计,黔东南州有国家保护珍稀濒危植物共计32科51属58种,文章对上述珍稀濒危植物的生活型及种子植物的区系成分特征进行了调查和分析,结果表明:该区分布的48属珍稀濒危种子植物中,热带分布型和温带分布型各有18属,分别占总属数的37.5%,其植物区系具有明显的温带性质;中国特有分布型11属,占总属数的23.0%,具有特有性强、起源古老的特征。

  7. Using small-scale studies to prioritize threats and guide recovery of a rare hemiparasitic plant: Cordylanthus rigidus ssp. littoralis.

    Directory of Open Access Journals (Sweden)

    Sean M Watts

    Full Text Available BACKGROUND: Recovering endangered species would benefit from identifying and ranking of the factors that threaten them. Simply managing for multiple positive influences will often aid in recovery; however, the relative impacts of multiple threats and/or interactions among them are not always predictable. We used a series of experiments and quantitative observational studies to examine the importance of five potential limiting factors to the abundance of a state-listed endangered hemiparasitic annual forb, Cordylanthus rigidus ssp. littoralis (C.r.l., California, USA: host availability, mammalian herbivores, insect seed predators, fire suppression, and exotic species. While this initial assessment is certainly not a complete list, these factors stem from direct observation and can inform provisional recommendations for management and further research. METHODOLOGY AND PRINCIPAL FINDINGS: Studies were conducted at five sites and included assessments of the influence of host availability, exotic species, exclusion of mammalian herbivores and insect seed predators on C.r.l. productivity, and simulated effects of fire on seed germination. C.r.l. was limited by multiple threats: individuals with access to host species produced up to three times more inflorescences than those lacking hosts, mammalian herbivory reduced C.r.l. size and fecundity by more than 50% and moth larvae reduced seed production by up to 40%. Litter deposition and competition from exotic plant species also appears to work in conjunction with other factors to limit C.r.l. throughout its life cycle. CONCLUSIONS AND SIGNIFICANCE: The work reported here highlights the contribution that a series of small-scale studies can make to conservation and restoration. Taken as a whole, the results can be used immediately to inform current management and species recovery strategies. Recovery of C.r.l. will require management that addresses competition with exotic plant species, herbivore pressure

  8. Using small-scale studies to prioritize threats and guide recovery of a rare hemiparasitic plant: Cordylanthus rigidus ssp. littoralis.

    Science.gov (United States)

    Watts, Sean M; Uhl, Melissa M; Maurano, Stephen P; Nuccio, Erin E

    2010-01-26

    Recovering endangered species would benefit from identifying and ranking of the factors that threaten them. Simply managing for multiple positive influences will often aid in recovery; however, the relative impacts of multiple threats and/or interactions among them are not always predictable. We used a series of experiments and quantitative observational studies to examine the importance of five potential limiting factors to the abundance of a state-listed endangered hemiparasitic annual forb, Cordylanthus rigidus ssp. littoralis (C.r.l., California, USA): host availability, mammalian herbivores, insect seed predators, fire suppression, and exotic species. While this initial assessment is certainly not a complete list, these factors stem from direct observation and can inform provisional recommendations for management and further research. Studies were conducted at five sites and included assessments of the influence of host availability, exotic species, exclusion of mammalian herbivores and insect seed predators on C.r.l. productivity, and simulated effects of fire on seed germination. C.r.l. was limited by multiple threats: individuals with access to host species produced up to three times more inflorescences than those lacking hosts, mammalian herbivory reduced C.r.l. size and fecundity by more than 50% and moth larvae reduced seed production by up to 40%. Litter deposition and competition from exotic plant species also appears to work in conjunction with other factors to limit C.r.l. throughout its life cycle. The work reported here highlights the contribution that a series of small-scale studies can make to conservation and restoration. Taken as a whole, the results can be used immediately to inform current management and species recovery strategies. Recovery of C.r.l. will require management that addresses competition with exotic plant species, herbivore pressure, and availability of preferred host species.

  9. [Molecular characterization of a HMG-CoA reductase gene from a rare and endangered medicinal plant, Dendrobium officinale].

    Science.gov (United States)

    Zhang, Lin; Wang, Ji-Tao; Zhang, Da-Wei; Zhang, Gang; Guo, Shun-Xing

    2014-03-01

    The 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) catalyzes the conversion of HMG-CoA to mevalonate in mavalonic acid pathway, which is the first committed step for isoprenoid biosynthesis in plants. However, it still remains unclear whether HGMR gene plays a role in the isoprenoid biosynthesis in Dendrobium officinale, an endangered epiphytic orchid species. In the present study, a HMGR encoding gene, designed as DoHMGR1 (GenBank accession JX272632), was identified from D. officinale using the reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) methods, for the first time. The full length cDNA of DoHMGR1 was 2 071 bp in length and encoded a 562-aa protein with a molecular weight of 59.73 kD and an isoelectric point (pI) of 6.18. The deduced DoHMGR1 protein, like other HMGR proteins, constituted four conserved domains (63-561, 147-551, 268-383 and 124-541) and two transmembrane motifs (42-64 and 85-107). Multiple sequence alignment and phylogenetic analyses demonstrated that DoHMGR1 had high identity (67%-89%) to a number of HMGR genes from various plants and was closely related to Vanda hybrid cultivar, rice and maize monocots. Real time quantitative PCR (qPCR) analysis revealed that DoHMGR1 was expressed in the three included organs. The transcripts were the most abundant in the roots with 2.13 fold over that in the leaves, followed by that in the stems with 1.98 fold. Molecular characterization of DoHMGR1 will be useful for further functional elucidation of the gene involving in isoprenoid biosynthesis pathway in D. officinale.

  10. Precious metals and rare earth elements in municipal solid waste – Sources and fate in a Swiss incineration plant

    Energy Technology Data Exchange (ETDEWEB)

    Morf, Leo S., E-mail: leo.morf@bd.zh.ch [Baudirektion Kanton Zürich, Amt für Abfall, Wasser, Energie und Luft, Zurich (Switzerland); Gloor, Rolf; Haag, Olaf [Bachema AG, Schlieren (Switzerland); Haupt, Melanie [Zentrum für nachhaltige Abfall-und Ressourcennutzung ZAR, Hinwil (Switzerland); Skutan, Stefan [Bachema AG, Schlieren (Switzerland); Lorenzo, Fabian Di; Böni, Daniel [Zentrum für nachhaltige Abfall-und Ressourcennutzung ZAR, Hinwil (Switzerland)

    2013-03-15

    Highlights: ► We carefully addressed all the very valuable comments and suggestions of the reviewers. ► We also have shortened the size of the paper and tried simplify it substantially, as requested by the reviewers (introduction 25% reduced!). ► We have decided to take the chance and have replaced the data for the “additional” elements (Cu, Cd, Zn, Pb, Sn, Cr, Ni, Fe, Al) of the earlier MFA (Morf, 2011) with data that belong to the samples of this study. ► We are convinced that with the revision the paper has significantly improved in quality and attractiveness. - Abstract: In Switzerland many kinds of waste, e.g. paper, metals, electrical and electronic equipment are separately collected and recycled to a large extent. The residual amount of municipal solid waste (MSW) has to be thermally treated before final disposal. Efforts to recover valuable metals from incineration residues have recently increased. However, the resource potential of critical elements in the waste input (sources) and their partitioning into recyclable fractions and residues (fate) is unknown. Therefore, a substance flow analysis (SFA) for 31 elements including precious metals (Au, Ag), platinum metal group elements (Pt, Rh) and rare earth elements (La, Ce, etc.) has been conducted in a solid waste incinerator (SWI) with a state-of-the-art bottom ash treatment according to the Thermo-Re® concept. The SFA allowed the determination of the element partitioning in the SWI, as well as the elemental composition of the MSW by indirect analysis. The results show that the waste-input contains substantial quantities of precious metals, such as 0.4 ± 0.2 mg/kg Au and 5.3 ± 0.7 mg/kg Ag. Many of the valuable substances, such as Au and Ag are enriched in specific outputs (e.g. non-ferrous metal fractions) and are therefore recoverable. As the precious metal content in MSW is expected to rise due to its increasing application in complex consumer products, the results of this study are

  11. Rare earth elements in fly ashes created during the coal burning process in certain coal-fired power plants operating in Poland - Upper Silesian Industrial Region.

    Science.gov (United States)

    Smolka-Danielowska, Danuta

    2010-11-01

    The subject of the study covered volatile ashes created during hard coal burning process in ash furnaces, in power plants operating in the Upper Silesian Industrial Region, Southern Poland. Coal-fired power plants are furnished with dust extracting devices, electro precipitators, with 99-99.6% combustion gas extracting efficiency. Activity concentrations ofTh-232, Ra-226, K-40, Ac-228, U-235 and U-238 were measured with gamma-ray spectrometer. Concentrations of selected rare soil elements (La, Ce, Nd, Sm, Y, Gd, Th, U) were analysed by means of instrumental neutron activation analysis (INAA). Mineral phases of individual ash particles were identified with the use of scanning electron microscope equipped with EDS attachment. Laser granulometric analyses were executed with the use of Analyssette analyser. The activity of the investigated fly-ash samples is several times higher than that of the bituminous coal samples; in the coal, the activities are: 226Ra - 85.4 Bq kg(-1), 40 K-689 Bq kg(-1), 232Th - 100.8 Bq kg(-1), 235U-13.5 Bq kg(-1), 238U-50 Bq kg(-1) and 228Ac - 82.4 Bq kg(-1).

  12. Rare earth elements in fly ashes created during the coal burning process in certain coal-fired power plants operating in Poland - Upper Silesian Industrial Region

    Energy Technology Data Exchange (ETDEWEB)

    Smolka-Danielowska, D. [University of Silesia, Sosnowiec (Poland). Faculty of Earth Science

    2010-11-15

    The subject of the study covered volatile ashes created during hard coal burning process in ash furnaces, in power plants operating in the Upper Silesian Industrial Region, Southern Poland. Coal-fired power plants are furnished with dust extracting devices, electro precipitators, with 99-99.6% combustion gas extracting efficiency. Activity concentrations of Th-232, Ra-226, K-40, Ac-228, U-235 and U-238 were measured with gamma-ray spectrometer. Concentrations of selected rare soil elements (La, Ce, Nd, Sm, Y, Gd, Th, U) were analysed by means of instrumental neutron activation analysis (INAA). Mineral phases of individual ash particles were identified with the use of scanning electron microscope equipped with EDS attachment. Laser granulometric analyses were executed with the use of Analyssette analyser. The activity of the investigated fly-ash samples is several times higher than that of the bituminous coal samples; in the coal, the activities are: {sup 226}Ra - 85.4 Bq kg{sup -1}, {sup 40}K-689 Bq kg{sup -1}, {sup 232}Th - 100.8 Bq kg{sup -1}, {sup 235}U - 13.5 Bq kg{sup -1}, {sup 238}U - 50 Bq kg{sup -1} and {sup 228}Ac - 82.4 Bq kg{sup -1}.

  13. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    September 20-30, 2011 Rare earth market remained steady recently. Quoted prices of didymium products by separation and smelting plants kept stable. Some rare earth industrial zones in Baotou, Sichuan and Ganzhou had suspended production with the intensified environmental protection control and consolidation of rare earth industry. Persons in the industry hold a positive attitude toward the rare earth market after the National Day' s holiday in China. The market will develop healthily and orderly in the future.

  14. Genetic Diversity and Population Structure of the Rare and Endangered Plant Species Pulsatilla patens (L.) Mill in East Central Europe.

    Science.gov (United States)

    Szczecińska, Monika; Sramko, Gabor; Wołosz, Katarzyna; Sawicki, Jakub

    2016-01-01

    Pulsatilla patens s.s. is a one of the most endangered plant species in Europe. The present range of this species in Europe is highly fragmented and the size of the populations has been dramatically reduced in the past 50 years. The rapid disappearance of P. patens localities in Europe has prompted the European Commission to initiate active protection of this critically endangered species. The aim of this study was to estimate the degree and distribution of genetic diversity within European populations of this endangered species. We screened 29 populations of P. patens using a set of six microsatellite primers. The results of our study indicate that the analyzed populations are characterized by low levels of genetic diversity (Ho = 0.005) and very high levels of inbreeding (FIS = 0.90). These results suggest that genetic erosion could be partially responsible for the lower fitness in smaller populations of this species. Private allelic richness was very low, being as low as 0.00 for most populations. Average genetic diversity over loci and mean number of alleles in P. patens populations were significantly correlated with population size, suggesting severe genetic drift. The results of AMOVA point to higher levels of variation within populations than between populations.The results of Structure and PCoA analyses suggest that the genetic structure of the studied P. patens populations fall into three clusters corresponding to geographical regions. The most isolated populations (mostly from Romania) formed a separate group with a homogeneous gene pool located at the southern, steppic part of the distribution range. Baltic, mostly Polish, populations fall into two genetic groups which were not fully compatible with their geographic distribution.Our results indicate the serious genetic depauperation of P. patens in the western part of its range, even hinting at an ongoing extinction vortex. Therefore, special conservation attention is required to maintain the populations

  15. Metal contamination status of the soil-plant system and effects on the soil microbial community near a rare metal recycling smelter.

    Science.gov (United States)

    Li, Zhu; Ma, Tingting; Yuan, Cheng; Hou, Jinyu; Wang, Qingling; Wu, Longhua; Christie, Peter; Luo, Yongming

    2016-09-01

    Four heavy metals (Cd, Cu, Pb and Zn), two metalloids (As and Sb) and two rare metals (In and Tl) were selected as target elements to ascertain their concentrations and accumulation in the soil-plant system and their effects on the structure of the soil microbial community in a typical area of rare metal smelting in south China. Twenty-seven soil samples 100, 500, 1000, 1500 and 3000 m from the smelter and 42 vegetable samples were collected to determine the concentrations of the target elements. Changes in soil micro-organisms were investigated using the Biolog test and 454 pyrosequencing. The concentrations of the eight target elements (especially As and Cd) were especially high in the topsoil 100 m from the smelter and decreased markedly with increasing distance from the smelter and with increasing soil depth. Cadmium bio-concentration factors in the vegetables were the highest followed by Tl, Cu, Zn, In, Sb, Pb, and then As. The concentrations of As, Cd and Pb in vegetables were 86.7, 100 and 80.0 %, respectively, over the permissible limits and possible contamination by Tl may also be of concern. Changes in soil microbial counts and average well colour development were also significantly different at different sampling distances from the smelter. The degree of tolerance to heavy metals appears to be fungi > bacteria > actinomycetes. The 454 pyrosequencing indicates that long-term metal contamination from the smelting activities has resulted in shifts in the composition of the soil bacterial community.

  16. 茶叶中稀土元素的研究进展%Research progress of rare earth element in tea plants (Camelliasinensis L.)

    Institute of Scientific and Technical Information of China (English)

    彭传燚; 李大祥; 宛晓春; 蔡荟梅

    2015-01-01

    稀土元素对茶树生长和茶叶品质有系列影响。茶树对轻稀土(La, Ce, Y和Nd等)具有较强的生物富集作用,茶树各部位稀土总量大小为:根>茎>老叶>成熟叶>叶柄>芽头,其中茶树叶片中的稀土含量与其老嫩度呈显著的正相关。据报道,我国居民膳食摄入稀土含量均值为0.133 mg/d,而通过饮茶摄入稀土的含量估算为0~0.1129 mg/d,均远小于文献报道的稀土日允许摄入量(1.2~57.6 mg/d),稀土元素饮食暴露水平很低。目前,还没有稀土日允许摄入量的相关标准,但茶叶中稀土总量限量标准和粮食作物一样(2 mg/kg),茶叶不同于粮食作物,在限量的相关标准制订中应充分考虑茶叶的日消费量及稀土元素的水溶性。建议加强稀土食品安全的基础研究和系统性风险评估,以便为完善食品(茶叶)中稀土限量标准提供科学依据。%Rare earth element can be both a help and a hindrance for tea plants growth and tea quality. Tea plant had an enrichment impact on light rare earth element (La, Ce, Y and Nd,etc.), and the rare earth oxides (RE2O3) content of tea plant in descending order was: root > stem > old leave > mature leave > petiole > bud. There was a significant positive correlation between tenderness of tea leaves and RE2O3content. It was reported that daily intake of RE2O3content from diet was 0.133 mg/d, and the intake through tea consumptionwas estimated to be from 0 mg/d to 0.1129 mg/d, which was far below the acceptable daily intake reported (1.2~57.6 mg/d) and suggested that exposure to level of RE2O3was quite low. Currently, no standard limit for RE2O3 daily intake has been recommended by government. However, the limit for content of RE2O3 in tea was the same with food crops (2 mg/kg). Tea was different from food crops, so we should take full account of its daily consumption quantity and solubility of RE2O3 for setting the limitation. Consequently, basic researches on RE2O3 in food

  17. Concerning the preliminary results of space experiment with the seeds of rare plants (on the boad of BION-M No.1)

    Science.gov (United States)

    Gorelov, Yury; Kurganskaya, Lubov; Ilyin, Vyacheslav; Ruzaeva, Irina; Rozno, Svetlana; Kavelenova, Ludmila

    The problem of native flora plants conservation appears today as one of the most actual for humanity. The wide spreading natural ecosystems degradation results in the status changes for formerly common species to rare, endangered or extincted ones. That is why the complex of biological diversity conservation measures must be used including ex situ and in situ forms. Last years the seed banks (special seed collections in controlled conditions, including temperature below zero) and field banks (special alive plants collections) were created in many countries taking in mind the future of humanity. The seed banks as long-term depositories can be placed on the space stations where the threat of earth catastrophes is removed. But we must make it clear how the complex of space flight factors effects upon the seed quality and germination and plants development from “cosmic” seeds. For instance, the action of residual ionizing radiation into space apparatus on plant seeds can alter its vitality maybe by the growth of free radicals pool in molecular and subcellular level. The unknown level of such action permits us to propose wide diapason of effects from the absence of any changes to the stimulation of vital activity, decrease of it, mutagenesis and maybe the death of seeds. Only the experiments that begin in space and continue on the Earth can show us the effect of space flight factors complex on plant seeds. Here we describe the first results of experiment held on the board of space apparatus “Bion-M” No1. Totally 79 experiments were included to the program of “Bion-M”, among them the experiment “Biocont-BS”. The equipment for it was prepared by Central Scientific Research Institute of Machine-building; the seed material was selected and prepared by the Botanical Garden of Samara State University. The equipment with seeds was into space apparatus, which working orbit was average 575 km and the flight lasted for 30 days. The seed samples of 9 rare plants

  18. Rare Power

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    China begins to reinvigorate the rare earth industry after decades of underselling the valuable metals On May 19,the State Council released Guidelines to Promote Sustainable and Sound Development of the Rare Earth Industry,delivering a strong boost to the fragmented industry.

  19. Rare Security

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    China’s regulation on rare earth accords with WTO rules Worries abound Western countries may use a recent WTO ruling on China’s exports restriction on nine raw materials to launch actions against China’s curbs on rare earth exports.

  20. Behavior and distribution of heavy metals including rare Earth elements, thorium, and uranium in sludge from industry water treatment plant and recovery method of metals by biosurfactants application.

    Science.gov (United States)

    Gao, Lidi; Kano, Naoki; Sato, Yuichi; Li, Chong; Zhang, Shuang; Imaizumi, Hiroshi

    2012-01-01

    In order to investigate the behavior, distribution, and characteristics of heavy metals including rare earth elements (REEs), thorium (Th), and uranium (U) in sludge, the total and fractional concentrations of these elements in sludge collected from an industry water treatment plant were determined and compared with those in natural soil. In addition, the removal/recovery process of heavy metals (Pb, Cr, and Ni) from the polluted sludge was studied with biosurfactant (saponin and sophorolipid) elution by batch and column experiments to evaluate the efficiency of biosurfactant for the removal of heavy metals. Consequently, the following matters have been largely clarified. (1) Heavy metallic elements in sludge have generally larger concentrations and exist as more unstable fraction than those in natural soil. (2) Nonionic saponin including carboxyl group is more efficient than sophorolipid for the removal of heavy metals in polluted sludge. Saponin has selectivity for the mobilization of heavy metals and mainly reacts with heavy metals in F3 (the fraction bound to carbonates) and F5 (the fraction bound to Fe-Mn oxides). (3) The recovery efficiency of heavy metals (Pb, Ni, and Cr) reached about 90-100% using a precipitation method with alkaline solution.

  1. Small-scale hydropower plants and rare bryophytes and lichens. Knowledge and lack of knowledge; Smaakraftverk og sjeldne moser og lav. Kunnskap og kunnskapsmangler

    Energy Technology Data Exchange (ETDEWEB)

    Evju, Marianne; Hassel, Kristian; Hagen, Dagmar; Erikstad, Lars

    2011-08-15

    There is a large and increasing interest for the development of small-scale hydropower in Norway. Small-scale hydropower plants may impact the biological diversity negatively through destruction, degradation or fragmentation of habitats. Both the environmental investigations and the treatment of applications for small-scale hydropower plants put a great emphasis on red listed species, and in particular on red-listed bryophytes and lichens growing in stream ravines and in meadows and rock faces influenced by waterfalls. Bryophytes and lichens can be difficult to identify in the field, and knowledge of the species' ecology, distribution and population sizes is insufficient. A large review of environmental investigations of small-scale hydropower plants, documented that red-listed lichens were rarely recorded, and red-listed bryophytes were never recorded. In this report, we try to make visible the knowledge we have and the knowledge we lack of red listed bryophytes and lichens in areas in which the development of small-scale hydropower is relevant. Most focus is placed on bryophytes. The report is mainly a collation of existing knowledge. There is a great variation among stream ravines in the occurrence of species. Several factors, such as stability of moisture conditions, tree species composition and bedrock, interact to affect the occurrence of species. Red-listed bryophytes and lichens occur both in the forest and in affiliation with the stream. A reduction of local moisture, through e.g. logging of forest close to the stream or reduction of the water flow, will probably affect the species negatively. River regulation will change the frequency of flooding and affect the ice drift in the stream, which may negatively affect species living on dead wood in or close to the stream. Several species are vulnerable to deteriorated habitat quality and habitat fragmentation as their habitat requirements are narrow and their dispersal capacity is limited. However, we

  2. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    November 1-10, 2012 Some key rare earth producers had paused production since the last ten day period of October in order to retain normal production and market order and stabilize rare earth prices. The production suspension measure by the plants together with severe cracking down on illegal mining by the government had some influence on sluggish market recently. Data showed rapid price increase of major rare earth products after sharp decline previously.

  3. Study on Diversity and Utilization of Rare and Endangered Plants in Yangming Mountain%阳明山珍稀特有植物的多样性及其保护利用初探

    Institute of Scientific and Technical Information of China (English)

    张卫阳; 蒋建军

    2011-01-01

    Yangming Mountain was located in the northern foot of Nanling Mountains area, southern Hunan province. The area was rich in plant species and concentrated in rare and endangered plants due to its special geographical location and u-nique climate conditions. According to the investigation, there were 219 families, 851 genera, 1 921 species in Yangming Mountain area among which there were 86 kinds of rare and endemic plants including 9 kinds of national first level protecting plants, 69 kinds of national 2nd level protecting plants, 23 kinds of rare and endangered plants, 5 endemic species. There were 22 Chinese special genera plants, which accounted for about 15.4% in China.%阳明山位于湖南省南部,地处南岭山脉北麓群山区,其特殊的地理位置和独特的气候条件,使其成为湖南省植物种类丰富、珍稀濒危植物分布较集中的地区.据调查统计,阳明山有维管植物219科、851属、1 921种,其中珍稀特有植物有86种,属国家一级保护的植物有9种、二级保护的69种,列为稀有或渐危的植物23种,特有植物5种.还有中国特有植物属22属,占全国总数的15.4%.

  4. Quantitative method for identifying networks of minimum priority sites for protection of rare and endangered plant species in Guangdong,China

    Institute of Scientific and Technical Information of China (English)

    Benyang WANG; Fuhe LUO; Xuening ZHEN; Shixiao YU

    2009-01-01

    The approaches to enlarge the protected areas are deeply embedded in the conservation planning.In practice,however,even in some sites of top conservation priority,there exist problems of inefficient conservation for lack of funding,to say nothing of assisting all species under threat from the viewpoint of conservationists.Identifying priority sites for conservation and establishing networks of minimum priority sites (NOMPS) are helpful for promoting the transition from number and size oriented,to quality and effectiveness oriented practices of biological conservation,and for realizing the target of biodiversity conservation with the most benefits for the least costs.Based on heuristic algorithm and integer linear programming (ILP),we propose a refined method of heuristic integer linear programming (HILP) for quantitative identification of the NOMPS to protect rare and endangered plant species (REPS) in Guangdong Province,China.The results indicate that there are 19 priority sites which are essential for protecting all of the 107 REPS distributed in 83 sites in Guangdong.These should be the paramount targets of financing and management.Compared with the ILP,which uses minimum number of sites as the only constraint,HILP takes into consideration of the effect of species richness,and is thus more suitable for conservation practices though with a little more number of priority sites selected.It is suggested that ILP and HILP are both effective quantitative methods for identifying NOMPS and can yield important information for decision making,especially when economic factors are constraints for biological conservation.

  5. Analysis of Naturally Occurring Phenolic Compounds in Aromatic Plants by RP-HPLC Coupled to Diode Array Detector (DAD and GC-MS after Silylation

    Directory of Open Access Journals (Sweden)

    Charalampos Proestos

    2013-03-01

    Full Text Available The following aromatic plants of Greek origin, Origanum dictamnus (dictamus, Eucalyptus globulus (eucalyptus, Origanum vulgare L. (oregano, Mellisa officinalis L. (balm mint and Sideritis cretica (mountain tea, were examined for the content of phenolic substances. Reversed phase HPLC coupled to diode array detector (DAD was used for the analysis of the plant extracts. The gas chromatography-mass spectrometry method (GC-MS was also used for identification of phenolic compounds after silylation. The most abundant phenolic acids were: gallic acid (1.5–2.6 mg/100 g dry sample, ferulic acid (0.34–6.9 mg/100 g dry sample and caffeic acid (1.0–13.8 mg/100 g dry sample. (+-Catechin and (−-epicatechin were the main flavonoids identified in oregano and mountain tea. Quercetin was detected only in eucalyptus and mountain tea.

  6. Investigation on the Rare and Endangered Plants of Zhangshiyan Area in Hebei Province%嶂石岩景区珍稀濒危植物资源调查

    Institute of Scientific and Technical Information of China (English)

    闫路娜

    2012-01-01

    采用路线踏查并辅以典型样地取样的方法对河北省嶂石岩景区植物资源进行调查,同时依据相关文献对植物的濒危程度及级别进行评价.分析了景区珍稀濒危植物资源现状,为其保护利用提供参考.发现景区共有省级以上珍稀濒危植物36种,并对濒危植物的种类组成、保护价值、蕴藏量及致危原因进行了分析讨论.河北嶂石岩景区珍稀濒危植物资源正呈逐年减少趋势,主要是由于人类对自然界的过度侵害和资源掠夺所造成的,因此建立合理的濒危植物保护开发策略势在必行.%Route survey and typical sampling were adopted to get the data of plant resources in Zhangshiyan area. And the level of endangered plant were evaluated according to relevant literature. The status of rare and endangered plant resources in Zhangshiyan area were analyzed to provide reference for protection and utilization of these wild resources. According to the investigation results, there were 36 rare plant species in Zhangshiyan area. The rare and endangered plant resources of Zhangshiyan area in Hebei was decreasing mainly due to excessive violations and exploitation, so it was imperative to set up a reasonable strategy for protecting and exploiting the endangered plant in the future.

  7. Clean Production Technology in Electrolysis Process in a Rare Earth Plant%清洁生产技术在稀土金属冶炼行业中的应用

    Institute of Scientific and Technical Information of China (English)

    程妍东; 梁英; 陶德

    2011-01-01

    以某稀土企业的电解稀土生产工艺为例,介绍了较为先进的稀土电解行业的清洁生产方案,为今后稀土行业清洁生产技术的发展提供了现实依据,对稀土行业清洁生产和循环经济的推广具有重要的现实意义.%This paper presents an advanced clean production technology for rare earth metal production by eletrolysis processes with a rare earth plant as an example. It is of great importance for the development of clean production and recycling economy in rare earth industries.

  8. 历山自然保护区珍稀濒危植物及其保护%Rare and Endangered Plants in Lishan Nature Reserve, Shanxi and Their Conservation

    Institute of Scientific and Technical Information of China (English)

    卢景龙

    2009-01-01

    Lishan Nature Reserve,belonging to Zhongtiao Ranges,is situated between 35°16'30"-35°27'20" N and 111°51'10"-112°5'35" E in southern Shanxi. It is now known that there are 972 species of seed plants,belonging to 491 genera and 123 families in the reserve. It is one of the richer area of rare and endangered plants in Shanxi,including state 1st level key protection plant Taxus mairei,state 2nd level key protection plants Cercidiphyllum japonicum and Glycine soja. Moreover,there are Shanxi Provincial level key protection plant 22 species. Based on the situation and problems of the rare and endangered plants,the endangered causes of those plants were analyzed,the strategies for the protection of those plants were raised.%历山国家级自然保护区位于中条山山脉的东段,有种子植物972种,隶属于491属,123科.历山是山西省珍稀濒危植物分布最丰富的地区之一,有国家一级保护植物1种,南方红豆杉;国家二级保护植物2种,连香树和野大豆.山西省省级重点保护植物22种.分析了历山珍稀濒危植物的原因,提出了科学保护对策.

  9. Small-scale hydropower plants and rare bryophytes and lichens. Knowledge and lack of knowledge; Smaakraftverk og sjeldne moser og lav. Kunnskap og kunnskapsmangler

    Energy Technology Data Exchange (ETDEWEB)

    Evju, Marianne; Hassel, Kristian; Hagen, Dagmar; Erikstad, Lars

    2011-08-15

    There is a large and increasing interest for the development of small-scale hydropower in Norway. Small-scale hydropower plants may impact the biological diversity negatively through destruction, degradation or fragmentation of habitats. Both the environmental investigations and the treatment of applications for small-scale hydropower plants put a great emphasis on red listed species, and in particular on red-listed bryophytes and lichens growing in stream ravines and in meadows and rock faces influenced by waterfalls. Bryophytes and lichens can be difficult to identify in the field, and knowledge of the species' ecology, distribution and population sizes is insufficient. A large review of environmental investigations of small-scale hydropower plants, documented that red-listed lichens were rarely recorded, and red-listed bryophytes were never recorded. In this report, we try to make visible the knowledge we have and the knowledge we lack of red listed bryophytes and lichens in areas in which the development of small-scale hydropower is relevant. Most focus is placed on bryophytes. The report is mainly a collation of existing knowledge. There is a great variation among stream ravines in the occurrence of species. Several factors, such as stability of moisture conditions, tree species composition and bedrock, interact to affect the occurrence of species. Red-listed bryophytes and lichens occur both in the forest and in affiliation with the stream. A reduction of local moisture, through e.g. logging of forest close to the stream or reduction of the water flow, will probably affect the species negatively. River regulation will change the frequency of flooding and affect the ice drift in the stream, which may negatively affect species living on dead wood in or close to the stream. Several species are vulnerable to deteriorated habitat quality and habitat fragmentation as their habitat requirements are narrow and their dispersal capacity is limited. However, we

  10. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    June 20-30, 2011 Prices of heavy rare earth products remained soaring. The same happened to dysprosium and its related products due to tight supply. Separation plants held tightly of europium oxide. Refining plants took a positive attitude toward the ma

  11. 野生稀有种药用植物遥感监测方法及其标准的建立%Establish remote of sensing monitoring method and standard on wild rare medical plant

    Institute of Scientific and Technical Information of China (English)

    张小波; 孙宇章; 黄璐琦; 郭兰萍; 朱文泉; 潘耀忠

    2009-01-01

    At present the shortage of the resources of wild and rare medicinal plants is very serious in China. So grasping the situation and change tendency of medicinal plant resources comprehensive and real-timely, is vital significance to realize the sustainable using of medicinal plant resources. In order to use the remote sensing monitor technology and method to study the resources of the wild and rare medicinal plants, this article discusses the principle, method, technology and the principle and standard based on the operation and experiment of remote sensing monitor on the resources of wild rare medicinal plant.%目前我国野生稀有药用植物资源量严重不足,全面实时的掌握我国野生稀有种药用植物资源的现状及其变化趋势,对实现药用植物资源的可持续利用具有重要意义.为了将野生稀有种药用植物遥感监测技术和方法进一步普及和应用,作者以野生稀有种药用植物资源遥感监测研究的操作流程和实验为基础,论述利用遥感技术对野生稀有种中药资源进行监测的原理、方法、内容以及应该遵循的原则和标准.

  12. Rare events: a state of the art

    Energy Technology Data Exchange (ETDEWEB)

    Uppuluri, V.R.R.

    1980-12-01

    The study of rare events has become increasingly important in the context of nuclear safety. Some philosophical considerations, such as the framework for the definition of a rare event, rare events and science, rare events and trans-science, and rare events and public perception, are discussed. The technical work of the Task Force on problems of Rare Events in the Reliability Analysis of Nuclear Plants (1976-1978), sponsored by OECD, is reviewed. Some recent technical considerations are discussed, and conclusions are drawn. The appendix contains an essay written by Anne E. Beachey, under the title: A Study of Rare Events - Problems and Promises.

  13. Not so Rare, Rare Diseases

    Science.gov (United States)

    Waldman, H. Barry; Perlman, Steven P.; Munter, Beverly L.; Chaudhry, Ramiz A.

    2008-01-01

    A rare disease or condition is defined by federal legislation such that it: (1) affects less than 200,000 persons in the U.S.; or (2) affects more than 200,000 persons in the U.S. but for which there is no reasonable expectation that the cost of developing and making available in the U.S. a drug for such disease or condition will be recovered from…

  14. Case Analysis and Study on Cleaner Production Auditing in Rare Earth Processing Plant%稀土加工企业清洁生产审核案例分析与研究

    Institute of Scientific and Technical Information of China (English)

    文震林; 桂双林

    2014-01-01

    以某稀土加工企业清洁生产审核为案例,对其生产过程进行调查和诊断,找出稀土加工企业生产过程中能耗高、物耗高、污染重的原因,提出降低能耗、物耗及废物产生的方案,进而选定技术、经济及环境可行的清洁生产方案,并对清洁生产审核过程及其实施效果进行分析,为今后稀土加工企业实施清洁生产审核积累经验。%Investigation and diagnosis to the production process with a rare earth processing plant cleaner production audit cases, to find a rare earth processing plant production process of high energy consumption, high material consumptions and heavy pollution reasons, put forward to reduce material consumptions of energy consumption and waste generation, and then selected technical, economic and environmental feasible project, and the cleaner production audit process and its effect are analyzed, to provide experience for the other rare earth processing enterprises to implement cleaner production audit.

  15. [Severe contact-allergy dermatitis due to poison ivy--a plant that is rarely encountered in The Netherlands; a family history].

    Science.gov (United States)

    Leclercq, R M F M

    2005-07-23

    In successive years, three members of the same family (a man and woman aged 46 years and their son, aged 20) constantly developed severe pruritic, erythematous, vesicular and bullous dermatitis in the spring and summer after working in the garden. Although the findings were consistent with a photophytotoxic dermatitis, the causative plant remained unclear. Oral therapy with high doses ofprednisolone was necessary. When the man travelled to the USA and visited a doctor there, he recognised the symptoms as those of contact dermatitis caused by poison ivy (Toxicodendron radicans), a plant that is found sporadically in the wild state in Europe. Their grandparents had brought the plant back from a trip to the USA and planted it in the garden because of the beautiful fall colours. The family identified the plant via a search on Internet and eliminated it from the garden completely. Since then, the family has no longer suffered from contact-allergy dermatitis.

  16. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    March 21-31,2012 Rare earth market rebounded holistically recently. Price of didymium products rose slightly after being stable for one month. There were also increases in the prices of europium oxide and terbium oxide, which led to a rush by phosphor plants. The market of yttrium-medium and europium-rich minerals remained stagnant though the rare earth market recovered. Price of the mineral was around RMB ¥210,000-250,000/ton.

  17. Investigation and Evaluation of the Rare and Endangered Tibetan Medicinal Plants in the Linzhi Region%林芝地区珍稀濒危藏药植物资源调查与评价

    Institute of Scientific and Technical Information of China (English)

    卢杰; 兰小中; 罗建

    2011-01-01

    Tibetan medicinal industry is one of six major pillar industries in Tibet autonomous region. The rare and endangered plants are increasingly and widely used in Tibetan medicinal industry; however, there has been lack of a clear understanding of these resources and their reasonable applications. In this study, the rare and endangered Tibetan medicinal plants distributed in the Linzhi region of Tibet were analyzed by the plot-quadrat method, walking and inquiry ways. In the investigation, 153 sample plots (30m×30m) and 1,377 quadrats (2m×2m) were set up in 51 typical sites, covering a total plot area of 137,700 m^2. Results show that there were 35 species of rare and endangered plants, pertaining to 23 families and 33 genera in the Linzhi region. The ratio of species was high, and it was an epitome of plants distribution in Tibet. The moisture content of aerial part was higher than that of underground part in many plants except for Codonopsis convolvulacea, Mirabilis himalaica, Polygonatum cirrhifolium, Asparagus filicinus, Pterocephalus hooked, Phlomis younghusbandii and Bupleurum marginatum var. stenophyllum. The mean biomass of Berberis Agricola was highest (1,800 g) and the lowest one was only 0.699 g for Polygonatum cirrhifolium. The biomass of aerial part was 14 times that of underground part for Herpetospermum pedunculosum, the ratio was the maximum, and the minimum ratio of them was 0.189 for Asparagus filicinus. Variations in biomass of aerial part, underground part, and the whole plant were similar for Polygonatum cirrhifolium, Halenia elliptica, Bupleurum marginatum var. stenophyllum and Veronica L. in the same latitude, but changes in the biomass showed different features, determined by plant height and density. The resources reserves of the rare and endangered plants were estimated to be 3,199.29 t in the Linzhi region. The biomass in unit area was closely related to altitude. Rare and endangered plants showed characteristics of abundant

  18. Stable C & N isotopes in 2100 Year-B.P. human bone collagen indicate rare dietary dominance of C4 plants in NE-Italy

    Science.gov (United States)

    Laffranchi, Zita; Huertas, Antonio Delgado; Jiménez Brobeil, Sylvia A.; Torres, Arsenio Granados; Riquelme Cantal, Jose A.

    2016-12-01

    C4 plants (e.g. maize, millet), part of our current diet, are only endemic of reduced areas in South-Europe due to their need of warm climates. Since the first vestiges of agriculture in Europe remains of C4 plants were recorded but their overall proportion in the human diet remains unknown. Therefore, isotopic (δ13C and δ15N) composition of bone collagen from the skeletal remains (human and animals) of a Celtic population, Cenomani Gauls, from Verona (3rd to 1st century BC) in the NE Italy provide a new perspective on this matter. The δ13C collagen values of 90 human skeletal individuals range between ‑20.2‰ and ‑9.7‰ (V-PDB) with a mean value of ‑15.3‰. As present day C4 plants have δ13C values around ‑11‰, which is equivalent to ‑9.5‰ for samples of preindustrial age, the less negative δ13C values in these individuals indicate a diet dominated by C4 plants. This palaeodietary study indicates that some European populations predominantly consumed cultivated C4 plants 2100 year B.P. This is supported by the paleobotanical records and ancient Roman sources (e.g. Pliny the Elder), which indicate that millet was a staple food in South-Europe.

  19. Simple additive effects are rare: a quantitative review of plant biomass and soil process responses to combined manipulations of CO2 and temperature

    DEFF Research Database (Denmark)

    Dieleman, Wouter I.J.; Vicca, Sara; Dijkstra, Feike A.;

    2012-01-01

    , possibly due to the warming-induced acceleration of decomposition, implying that progressive nitrogen limitation (PNL) may not occur as commonly as anticipated from single factor [ CO2 ] treatment studies. Responses of total plant biomass, especially of aboveground biomass, revealed antagonistic...

  20. Simple additive effects are rare: a quantitative review of plant biomass and soil process responses to combined manipulations of CO2 and temperature

    DEFF Research Database (Denmark)

    Dieleman, Wouter I. J.; Vicca, Sara; Dijkstra, Feike A.;

    2012-01-01

    , possibly due to the warming‐induced acceleration of decomposition, implying that progressive nitrogen limitation (PNL) may not occur as commonly as anticipated from single factor [ CO2 ] treatment studies. Responses of total plant biomass, especially of aboveground biomass, revealed antagonistic...

  1. Studies of transport pathways of Th, U, rare earths, Ra-228, and Ra-226 from soil to plants and farm animals: Final progress report, 1983-1988

    Energy Technology Data Exchange (ETDEWEB)

    Linsalata, P

    1988-07-01

    This report consists of three parts. Part 1 discusses a field study conducted in an area of enhanced, natural radioactivity to assess the soil to edible vegetable concentration ratios (CR = concentration in dry vegetable/concentration in dry soil) of Th-232, Th-230, Ra-226, Ra-228, and the light rare earth elements (REE's), La, Ce, and Nd. Twenty-eight soil, and approximately 42 vegetable samples consisting of relatively equal numbers of seven varieties, were obtained from 11 farms on the Pocos de Caldas Plateau in the state of Minas Gerais, Brazil. This region is the site of a major natural analogue study to assess the mobilization and retardation processes affecting thorium and the REE's at the Morro do Ferro ore body, and uranium series radionuclides at the Osamu Utsumi open pit uranium mine. Thorium (IV) serves as a chemical analogue for quadrivalent plutonium, the light REE's (III) as chemical analogues for trivalent americium and curium, and uranium (VI) as an analogue for transuranics with stable oxidation states above IV, e.g., Pu(VI). Part 2 includes our final measurement results for naturally occurring light rare earth elements (REE's include La, Ce, Nd, and SM), U-series and Th-series radionuclides in adult farm animal tissues, feeds and soils. Our findings on soil-to-tissue concentration ratios (CR's) and the comparative behavior of these elements in farm animals raised under natural conditions by local farmers are presented. Part 3 summarizes our findings to date on the distribution and mobilization of Th-232, light rare earth elements (LREE), U-238 and Ra-228 in the MF basin. Estimates of first order, present day, mobilization rate constants resulting from ground water solubilization and seepage/stream transport are calculated using revised inventory estimates for the occurrence of these elements in the ore body and annual flux estimates for the transport of these elements away from the ore body. 151 refs., 20 figs., 40 tabs.

  2. Dispersal and disturbance as factors limiting the distribution of rare plant species at the Savannah River Site and the Carolina Sandhills National Wildlife Refuge.

    Energy Technology Data Exchange (ETDEWEB)

    Primack, Richard; Walker, Joan.

    2003-12-10

    An experiment was conducted to identify effective methods of creating new populations of herbaceous species in managed upland longleaf pine forest at two locations in the Fall-line Sandhills of South Carolina. We included thirteen species and a variety of site treatments. All sites were burned and lightly raked prior to planting. Sowing seeds on untreated or fertilized treatments resulted in the lowest establishment of all treatments. Digging the planting area to remove belowground plant structures and using hardware cloth cages to exclude potential mammalian seed predators and herbivores led to increased establishment of target species. Establishment was higher using seedling transplants compared to seeds. Success rate was highly variable among sites so population establishment efforts should try to incorporate many sites initially to find the sites that give the greatest chance of success, or increase efforts to carefully identify species, habitat requirements and screen potential sites accordingly. Some species showed very low rates of success despite the variety of methods used; for such species additional work is required on their basic ecology, in particular germination biology and site requirements, as part of a restoration project. The overall low rate of establishment success emphasizes the need to protect and manage existing populations of uncommon Sandhills species, and to recognize that establishing large, long-term, reproducing populations of such species will be difficult.

  3. 南滚河国家级自然保护区珍稀濒危植物的分布特征%Distribution Characteristics of Rare and Endangered Plants in Nangun River National Nature Reserve

    Institute of Scientific and Technical Information of China (English)

    关佳洁; 余奇; 王娟; 杜凡; 杨宇明

    2014-01-01

    采用样地调查、线路调查的方法,对云南省南滚河国家级自然保护区珍稀濒危植物的资源状况及分布特征进行了研究。结果表明,(1)南滚河国家级自然保护区珍稀濒危植物共计206种,隶属于44科108属。其中,国家重点保护野生植物21种,云南省重点保护野生植物36种, IUCN红色名录植物17种, CITES附录植物143种。(2)发现新分布种长蕊木兰、水青树和逸生种喜树。(3)珍稀濒危种子植物区系联系广泛,属级水平上具有极强的热带性质;种级水平上具有热带成分向温带成分过渡的特征,且特有现象突出,与滇西南、滇南分布联系密切。(4)海拔510~2977 m,珍稀濒危植物的丰富度随海拔的增加呈先增后减的趋势,集中分布在海拔1000~1500 m的季风常绿阔叶林中。该保护区珍稀濒危植物面临的主要威胁是人为破坏,并针对所受威胁提出了保护建议。%Based on the data collected from sample-plots survey and sample-lines survey , the distribution charac-teristics of rare and endangered plants in Nangun River National Nature Reserve were studied .The results indicate that: 1) There are 206 rare and endangered plants in the reserve which belong to 108 genera and 44 families, in-cluding 21 species of national key protected plants , 36 species of Yunnan key protected plants , 17 species in the International Union for Conservation of Nature ( IUCN) Red List, and 143 species in the Convention on Internation-al Trade in Endangered Species ( CITES ) .2 ) Camptotheca acuminate as escaped species , and Alcimandra cath-cartii, Tetracentron sinense are new records in the reserve .3) The flora is characterised by extremely diversified , tropical floristic elements in genera level , and by transition from tropical floristic elements to temperate floristic ele-ments in species level , and obvious phenomena of endemism in species , a much closer ration

  4. 濒危植物翅果油树组织培养研究进展%Advance of New Researches on Tissue Culture of the Rare and Endangered Plant Elaeagnus mollis

    Institute of Scientific and Technical Information of China (English)

    刘庚伟; 陈惠

    2011-01-01

    This review summarized the recent research achievements on the process of tissue culture of the rare and endangered plant Elaeagnus mollis, including sterilizing protocols of different explants derived from adult plants and seeds for tube germination, two types of plants regeneration(organ type and organ genesis type),methods of rooting and transplanting, factors affecting culture, as well as browning and vitrification phenomena and avoiding measures. And the further biotechnology research fields of E. mollis were prospected.%综述了濒危植物翅果油树组织培养过程中成年植株与试管萌发种子苗取材的外植体的种类与消毒程序、植株再生的2条途径(器官型与器官发生型)、生根与移栽、影响培养的因素及培养过程中出现的褐化和玻璃化现象的防除等,并提出了翅果油树生物技术研究今后的发展方向.

  5. Liquid Culture of Adventitious Roots is a Potential Alternative to Field Cultivation for Psammosilene tunicoides, a Rare and Endangered Endemic Medicinal Plant

    Directory of Open Access Journals (Sweden)

    Zongshen Zhang

    2013-02-01

    Full Text Available The aim of this study was to establish an adventitious roots culture system for sterile plantlet segments of P. tunicoides and improved the accumulation of total saponins in cultured roots. Psammosilene tunicoides is a native Chinese plant with high commercial value as medicinal herb. Combination of NAA and IBA significantly affected the adventitious roots formation on agar-solided B5 media and a maximal induction rate of 83% was obtained at 24±2°C with a photoperiod of 12 h. With a shaking of 110 rpm in darkness, transferring the detached adventitious roots to the growth regulator free 1/2 B5 liquid media notably increased the biomass production compared to that on solid media over a 30-day-culture period. Further analyses showed that more saponins could be accumulated in the liquid culture than in the solid culture and the addition of exogenous oxalic acid to the liquid media could enhance the accumulation of total saponins in adventitious roots. These results suggested that adventitious roots culture will be an efficient alternative to the field cultivation of intact plants for the production of useful natural compounds from P. tunicoides.

  6. Establishment of Suspension Cell Culture from Agrobacterium-transformed Hairy Root Cells of Psammosilene tunicoides, an Endangered and Rare Medicinal Plant of China

    Directory of Open Access Journals (Sweden)

    Zhang Zong-Shen

    2015-08-01

    Full Text Available Psammosilene tunicoides is an important medicinal plant endemic in China. Its annual yield is severely limited due to slow growth, poor seed germination and excessive collection. To satisfy the growing market demands, it’s necessary to seek alternatives to field cultivation and wild resources of this endangered plant. Using Agrobacterium -transformed hairy roots as initial explants, here, we reported the development of a suspension cell culture system for P. tunicoides. Results showed the Agrobacterium -transformed hairy roots-derived suspension cells are fast in growth and strong in capacity for accumulation of bioactive metabolites. We established that 1/2MS was a suitable medium for culturing the hairy root-derived suspension cells and the optimal combination of phytohormones is 1.5 mg/L 2, 4-D+0.5 mg/L 6-BA+0.25 mg/L NAA+0.1 mg/L KT. Under this condition, the maximal biomass was achieved at the 20th day of culture with an average growth rate of 0.72 g/L/d; and the intracellular saponine content reached 0.92%, comparable to that of mother hairy roots. Compared with the normal P. tunicoides suspension cells, the hairy roots-derived suspension cells exhibited features of fast growth, short culture period and high concentration of saponines, suggesting that the large scale culture of hairy root-derived cells could be a feasible alternative to the wild resources of P. tunicoides.

  7. 贵州习水国家级自然保护区珍稀濒危维管束植物资源调查%Investigation on the Endangered and Rare Plant Resource in Xishui National Nature Reserve

    Institute of Scientific and Technical Information of China (English)

    李从瑞; 邓伦秀; 李茂; 何伟

    2012-01-01

    Based on the field investigation in Xishui Nature Reserve,a total of 35 species of endangered and rare plants were found and identified.Among them,3 species are listed in class Ⅰ of key national-protected plants,and 15 in class Ⅱ;17 species are provincial protective plants;there are 29 species of Angiosperms belonging to 22 genera in 14 families,5 species of Gymnosperms belonging to 4 genera in 3 families,and 1 species of Pteridophtes belonging to 1 genus in 1 families.A further study on these plant resources was also conducted in the aspects of distribution characteristics,ecological habits,application values,current status,and protection strategies,and discusses the cause to be endangered and the suggestion to protect.%根据历次野外调查及标本采集结果,保护区内有自然生长的珍稀濒危维管束植物35种,其中:国家Ⅰ级保护植物3种,国家Ⅱ级保护植物15种,贵州省级保护树种17种。包括蕨类植物1科1属1种;裸子植物3科4属5种;被子植物14科22属29种。本文对这些植物的分布特征、生态习性、利用价值、资源现状进行了初步研究,同时对其濒危程度和致危主要原因进行了初步探讨,并提出了保护建议。

  8. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    August 20-31, 2011 Rare earth market did not show the sign of picking-up and remained stagnant recently. Most suppliers continued to decrease their quoted price, but leading producers in northern and southern China did not adjust their quoted price. Most rare earth plants in southern China had not yet resumed production. Quoted price of didymium products swung and the quoted prices of dysprosium-related products were slipping affected by weak demand. Inquiries for europium oxide were decreasing affected by the slow phosphor market.

  9. Promoting role of an endophyte on the growth and contents of kinsenosides and flavonoids of Anoectochilus formosanus Hayata,a rare and threatened medicinal Orchidaceae plant

    Institute of Scientific and Technical Information of China (English)

    Fu-sheng ZHANG; Ya-li LV; Yue ZHAO; Shun-xing GUO

    2013-01-01

    Anoectochilus formosanus,commonly known as "Jewel Orchid",is a Chinese folk medicine used to treat hypertension,diabetes,and heart disease.The existence of A.formosanus is currently threatened by habitat loss,human and animal consumption,etc.The highly potent medicinal activity of A.formosanus is due to its secondary metabolites,especially kinsenosides and flavonoids.This orchid also has a unique mycorrhizal relationship.Most adult orchids rely on endophytes for mineral nutrition and have complex interactions with them,which are related to plant growth,yield and changes in secondary metabolites.This study investigated the promoting role of F-23 fungus (genus Mycena) on the biomass and contents of kinsenosides and flavonoids of A.formosanus in pot culture.The following were observed after 10 weeks of symbiotic cultivation:increased shoot height,shoot dry weight,and leaf numbers by 16.6%,31.3%,and 22.5%,respectively; increased contents of kinsenosides,isorhamnetin-3-O-[β-D-rutinoside,and isorhamnetin-3-O-β-D-glucopyranoside by 85.5%,226.1%,and 196.0%,respectively; some hyphae in epidermal cells dyed red and/or reddish brown by safranine; and,significantly reduced number of starch grains in cortical cells.Moreover,F-23 fungus significantly improved the kinsenoside and flavonoid contents of A.formosanus.These findings supported the reports that endophytes can alter the production of secondary metabolites in their plant hosts,although further physiological,genetic and ecological analyses are warranted.

  10. Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ Oversupply of rare earths led to the significant price drop of rare earth mineral products and separated products in Chinese domestic market. To stabilize the price, prevent waste of resources, further improve regulation capability on domestic rare earth market and rare earth price and maintain sustaining and healthy development of rare earth industry, partial rare earth producers in Baotou and Jiangxi province projected to cease the production for one month.

  11. Investigation and Analysis of the Rare and Endangered Wild Plants in Laoshan%崂山珍稀濒危野生植物资源调查分析

    Institute of Scientific and Technical Information of China (English)

    李清莹; 倪惠菁; 任莹; 臧德奎

    2015-01-01

    The protection,development and rational utilization of the rare and endangered wild plants have become one of the core contents of biodiversity protection.Located in the southeast coast of Shandong Pen-insula,Laoshan is among the most abundant biodiversity areas in Shandong province as a obvious north-south bridge.Using the sampling survey procedure,the paper provides a description on the natural distri-bution of 12 kinds of rare and endangered wild plants,and distribution range,interdependent community, habitat conditions and growth state in Laoshan.It puts forward the protection countermeasures as well.The survey shows that the numbers of rare and endangered wild plants are less in general.Species scatter across larger elevation ranges with uneven distribution.Species community types are relatively complex.Habitat is mostly located in the slope,and this characteristic is obvious.As the main part of human dis-turbance,tourism has medium intensity in this case.The protection levels vary widely.This investigation provides basic data for better protection of the wild plants.%保护、发展和合理利用珍稀濒危野生植物已成为保护生物多样性的核心内容之一。崂山地处山东半岛东南沿海,是山东省生物多样性最丰富的地区之一,具有明显的南北过渡性。采用样方法对崂山进行了系统调查,发现自然分布的12种珍稀濒危野生植物,对其分布范围、依存群落、生境状况和生长现状等进行了研究,并提出了保护对策。调查表明:崂山地区珍稀濒危野生植物数量总体偏少;物种较多零星分布,跨越海拔范围较大,分布不均匀;物种群落类型相对比较复杂;生境环境大都位于阴坡,特征较明显;人为干扰主要为旅游,干扰强度中等;受保护程度差别较大。本次调查为更好地保护这些珍稀濒危野生植物提供了基础资料。

  12. Rare Earth Resolution

    Institute of Scientific and Technical Information of China (English)

    Mei Xinyu

    2012-01-01

    BEFORE the early 1970s, China had no rare earth exports, and the world rare earth market was dominated by the United States, Europe and Japan. In the 1970s, China began to enter the world rare earth market and its share has picked up sharply in the following decades. Today, having the monopoly over global rare earth production, China must improve the benefits from rare earth production, not only from producing individual rare earth products, but also from mastering the intensive processing of rare earth products.

  13. 六盘山国家自然保护区珍稀濒危植物及其分布特点调查%Investigation of rare and endanger ed plants and their distribution feature in the Liupan Mountain National Nature Reserve

    Institute of Scientific and Technical Information of China (English)

    袁彩霞; 余杨春; 田瑛

    2016-01-01

    Using the combination of sample plot survey and line transect method, in Liupan Mountain National Natural Protection Area of rare and endangered plant resource status and distribution were studied. Investigation of Liupan Mountain within the territory of the distribution of national rare and endangered plant species and analysis its distribution characteristics. The results showed that in Liupan Mountain National Nature Reserve within the area of distribution of rare and endangered plants in a total of 19 families, 29 genera and 36 species, which focused on the protection of plants at the national level have three, 24 species of national key protected plants, 10 species of other endangered plants, at an altitude of 1800 to 2400 meters range is relatively concentrated distribution of rare and endangered plants in Liupan Mountain National Regional, should focus on strengthening the management and protection.%采用样地调查与样线调查相结合的方法,对六盘山国家级自然保护区珍稀濒危植物及分布状况进行了调查,分析其分布特点,结果表明:六盘山国家级自然保护区境内分布国家珍稀濒危植物共19科30属37种,其中国家一级重点保护植物有3种,国家二级重点保护植物23种,其他濒危植物11种,海拔1800~2400 m范围是六盘山国家珍稀濒危植物分布相对集中的区域,应重点加强管护。

  14. Xanthogranulomatous prostatitis: Rare presentation of rare disease

    Directory of Open Access Journals (Sweden)

    Rohan S Valsangkar

    2012-01-01

    Full Text Available Granulomatous inflammation of the prostate is a rare type of inflammation of the prostate. It is of various types, with the non-specific type of granulomatous inflammation being the most common. Xanthogranulomatous prostatitis is a rare type of granulomatous prostatitis of which very few cases have been reported. Histologically it is characterized by the presence of pale-looking foamy macrophages. It can be an incidental finding after transurethral resection of the prostate (TURP, although it may mimic prostatic malignancy clinically, biochemically, and rarely histologically. We report a rare case of xanthogranulomatous prostatitis which presented as a prostatic abscess, a presentation never reported in literature so far. The patient was managed with TURP.

  15. Rare Disorders and Diseases

    Science.gov (United States)

    Umlauf, Mary; Monaco, Jana; FitzZaland, Mary; FitzZaland, Richard; Novitsky, Scott

    2008-01-01

    According to the National Organization for Rare Disorders (NORD), a rare or "orphan" disease affects fewer than 200,000 people in the United States. There are more than 6,000 rare disorders that, taken together, affect approximately 25 million Americans. "Exceptional Parent" ("EP") recognizes that when a disorder affects a child or adult, it…

  16. Advances on Rare Earth Application in Pollution Ecology

    Institute of Scientific and Technical Information of China (English)

    Huang Xiaohua; Zhou Qing; Zhang Guangsheng

    2005-01-01

    The use of rare earth for inducing plant resistance was reviewed. The important developments in recent years were described, and rare earth can alleviate the pollution of acid rain, ozone, pesticide, heavy metals etc. in environment. The authors suggest that the mechanism of rare earth to inducing plant resistance and reducing plant injury is to control biochemical metabolism web in plant cell, to adjust its protection system of free radical, to maintain its photosynthesis, to protect cell membrane system and to carry through its function on mineral metabolism. Meanwhile some problems in the field were discussed as well.

  17. Impacts of Arbuscular Mycorrhizal Fungi and Water Conditions on Plant Growth in Rare Earth Tailings%AM真菌和水分条件对稀土尾矿堆中植物生长的影响

    Institute of Scientific and Technical Information of China (English)

    陈则友; 曹学章; 彭安萍; 荀志萌; 高彦征; 孔火良

    2012-01-01

    In a greenhouse pot experiment, ryegrass(Loliumperenne L.) and bermudagrass(Cynodon dactylon(L.)Peis.) were grown in rare earth tailings under different water treatments, and the effects of inoculation with three arbuscular mycorrhizal( AM) fungi(Diversispom spurcum, Glomus aggregatum and Glomus constrictum) on plant growth, Pb and Zn contents were investigated. The results indicated that rye-grass and bermudagrass have a certain combination with different AM fungi. Under drought stress(Wl and W2), inoculation with Glomus aggregatum markedly increased the growth of ryegrass, and for severe drought stress(Wl ) treatment, the plant height, shoot and root dry weight of ryegrass were increased by 76.16%, 202.86% and 481.82% than those of controls, respectively. Inoculation with Glomus constric-turn significantly increased the growth of bermudagrass, and for Wl treatment its plant height, shoot and root dry weight were increased by 119.17%, 290.63% and 247.37% than those of controls, respectively. The contents of Pb and Zn in plant had relations with water treatment, heavy metal properties and the varieties of AM fungi and plants, etc. Wl treatment inoculated with Glomus constrictum significantly reduced Pb content in ryegrass, while the Zn content was not affected; and for bermudagrass, Wl treatment inoculated with Glomus constrictum significantly increased the contents of Pb and Zn. In addition, this work also measured the leaf MDA and proline, and the results showed that inoculation with AM fungi dramatically reduced both leaf MDA and proline contents of two plants under drought treatment, which indicated that inoculations with AM fungi could improve the stress tolerance of plants effectively.%通过温室盆栽试验研究了不同水分处理下接种3种丛枝菌根(AM)真菌(Diversispora spurcum、Glomus aggregatum和Glomus constrictum)后对稀土矿砂中黑麦草(Lolium perenne L.)和狗牙根(Cynodon dactylon (L.) Pers.)植物株高、地上和地下部分

  18. Analysis of rare categories

    CERN Document Server

    He, Jingrui

    2012-01-01

    In many real-world problems, rare categories (minority classes) play essential roles despite their extreme scarcity. The discovery, characterization and prediction of rare categories of rare examples may protect us from fraudulent or malicious behavior, aid scientific discovery, and even save lives. This book focuses on rare category analysis, where the majority classes have smooth distributions, and the minority classes exhibit the compactness property. Furthermore, it focuses on the challenging cases where the support regions of the majority and minority classes overlap. The author has devel

  19. Inventory of Rare of Endangered Vascular Plants Occurring in the Floodplain of the Mississippi River between Cairo, Illinois, and St. Paul, Minnesota, and in the Floodplain of the Illinois River between Grafton, Illinois, and Chicago,

    Science.gov (United States)

    1975-01-01

    disturbed areas. It flowers from May to August. -:. :i5 1 53 Sesbania exaltata (Raf.) Cory Sesbania Family Leguminosae Status: Rare (Illinois). This is... Leguminosae Statuae Rare (T11inois). UttJt ts recent discovery in 1974 in a sandy prairie near Lock- pot, n .Will County, along the Illinois and Michigan

  20. Primary Results of New Rare Earth Materials for Hongti Grape

    Institute of Scientific and Technical Information of China (English)

    He Qiong; Gu Jiangyuan; Wang Jiachen

    2004-01-01

    New rare earth (RE) materials including RE phosphate as base fertilizer, bioactive RE micro-fertilizer and RE entire plant nutrition agent as topdressing fertilizer are treated on Hongti grope.The result showes that the plant leaves become thicker, the color is dark green, the plant disease index is lower, and the sugar content significantly increases.

  1. Why trees and shrubs but rarely trubs?

    Science.gov (United States)

    Scheffer, Marten; Vergnon, Remi; Cornelissen, J Hans C; Hantson, Stijn; Holmgren, Milena; van Nes, Egbert H; Xu, Chi

    2014-08-01

    An analysis of the maximum height of woody plant species across the globe reveals that an intermediate size is remarkably rare. We speculate that this may be due to intrinsic suboptimality or to ecosystem bistability with open landscapes favouring shrubs, and closed canopies propelling trees to excessive tallness.

  2. Rare, Threatened and Endangered Species, Layer identifies occurrences of rare, threatened and endangered plants, animals, exemplary or unique natural communities, and important animal assemblages., Published in 1995, 1:12000 (1in=1000ft) scale, NC DENR / Office of Conservation, Planning, and Community Affairs / Natural Heritage Program.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Rare, Threatened and Endangered Species dataset, published at 1:12000 (1in=1000ft) scale, was produced all or in part from Field Observation information as of...

  3. Research Status and Utilization Strategies of Rare Medicinal Plants in Taxus%红豆杉属植物资源的研究现状与开发利用对策

    Institute of Scientific and Technical Information of China (English)

    王亚飞; 王强; 阮晓; 张莺莺

    2012-01-01

    对珍稀药用资源植物红豆杉属的分类、种分布、主要化学成分及药理学作用的国内外研究现状进行归纳分析,对红豆杉属植物资源开发利用过程中遇到的问题以及可能的解决方案进行讨论.目前全球共发现和鉴定红豆杉属11个种,从中分离鉴定出三大类即巴卡亭Ⅲ及其他紫杉烷类物质、紫杉黄酮和红豆杉多糖等共500余种化学成分.对红豆杉属植物的药理学研究发现,其具有显著的防癌、抗肿瘤、抗氧化、清除自由基、调节心血管系统、抗炎、抗衰老等药理学作用.红豆杉属植物开发利用过程中存在种群遗传多样性保护与生物资源减少、红豆杉属植物资源分布地域性与次生代谢多样性、新结构物质发现与药理学作用机制研究相互脱节等问题.提出引种驯化与构建红豆杉属植物种质资源库、建设红豆杉属高质原料标准化生产技术体系、依托现代科技手段构建红豆杉属植物高效利用的技术平台等对策.%This article reviewed the classification, distribution, main chemical constituents and their biological activities of genus Taxus, rare medicinal plants, and also discussed the research status, problems in the exploitation and potential solutions. Taxus was composed of 11 species (including one artificial hybrid species) mainly distributing in the Northern Hemisphere. More than 500 chemical compounds have been identified from the genus and can be sorted into 3 types (Taxane derivatives like Baccatin Ⅲ , flavonoids and polysaccharides). These compounds have much important pharmacological activity such as anti-cancer, anti-oxidant, elimination of free radicals, anti-inflammatory, cardiovascular system regulation, and anti-aging. However there exist some problems in utilization of the important plant resources, such as, decreases in the species genetic diversity and the biological resources, conflict between regional distribution of the

  4. A rare opportunity beckons

    Energy Technology Data Exchange (ETDEWEB)

    Gschneidner, K

    2011-02-01

    There is a great deal of uncertainty for the future of rare-earth production. Rare-earths are a collection of 17 chemical elements in the periodic table, which include scandium and yttrium as well as the 15 lanthanides, such as dysprosium and ytterbium. China has a stranglehold on today's rare-earth market, which was worth about $3bn in 2010, with the country accounting for about 95% of worldwide production. Yet China's future actions can only be guessed at best. In September it halted shipments of rare-earth elements to Japan over a diplomatic spat concerning the detention of a Chinese trawler captain. Although the ban was later lifted, the episode raised concerns around the world about China's rare-earth monopoly and its use in diplomacy. China has already warned that it will not export any rare-earth material in the coming years as it expects its own consumption of rare-earth metals to increase. The country has introduced export taxes as well as production and export quotas, and also refused to grant any new rare-earth mining licences. Furthermore, because its reserves are limited and China's internal markets are growing so rapidly, the country has suggested it will no longer export products that require rare-earth elements, especially those that need heavy rare-earth elements, such as terbium and dysprosium. China's actions have led to huge rises in the cost of rare-earth materials and products. Dysprosium oxide, for example, has shot up from $36 per kilogram in 2005 to a massive $305 per kilogram by late last year. This could have a huge impact on much of today's electronics industry, given that rare-earth elements are ubiquitous in electric motors, computers, batteries, liquid-crystal displays (LCDs) and mobile phones. Neodymium-iron-boron permanent magnets, for example, are used as computer spindle drives. The question is: what can be done to ensure that China's dominance of the rare-earth industry does not affect the

  5. FTIR spectroscopic evaluation of changes in the cellular biochemical composition of the phytopathogenic fungus Alternaria alternata induced by extracts of some Greek medicinal and aromatic plants

    Science.gov (United States)

    Skotti, Efstathia; Kountouri, Sophia; Bouchagier, Pavlos; Tsitsigiannis, Dimitrios I.; Polissiou, Moschos; Tarantilis, Petros A.

    2014-06-01

    In this study, the biological activity of aquatic extracts of selected Greek medicinal and aromatic plants to the phytopathogenic fungus Alternaria alternata was investigated. Lamiaceae species (Hyssopus officinalis L., Melissa officinalis L., Origanum dictamnus L., Origanum vulgare L. and Salvia officinalis L.) were found to enhance significantly the mycelium growth whereas Crocus sativus appears to inhibit it slightly. M. officinalis and S. officinalis caused the highest stimulation in mycelium growth (+97%) and conidia production (+65%) respectively. In order to further investigate the bioactivity of plant extracts to A. alternata, we employed Fourier Transform Infrared Spectroscopy (FTIR). Differences of original spectra were assigned mainly to amides of proteins. The second derivative transformation of spectra revealed changes in spectral regions corresponding to absorptions of the major cellular constituents such as cell membrane and proteins. Principal component analysis of the second derivative transformed spectra confirmed that fatty acids of the cell membranes, amides of proteins and polysaccharides of the cell wall had the major contribution to data variation. FTIR band area ratios were found to correlate with fungal mycelium growth.

  6. Analysis of rare categories

    CERN Document Server

    He, Jingrui

    2012-01-01

    This book focuses on rare category analysis where the majority classes have smooth distributions and the minority classes exhibit the compactness property. It focuses on challenging cases where the support regions of the majority and minority classes overlap.

  7. Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ July 20~31 Rare earth market still went downward, which was mainly led by sluggish demand for didymium products. Weak demand by domestic NdFeB market was attributed to continuous price falling of didymium mischmetal.

  8. Rare causes of osteoporosis

    OpenAIRE

    Marcucci, Gemma; Brandi, Maria Luisa

    2015-01-01

    Osteoporosis is a metabolic bone disease characterized by loss of bone mass and strength, resulting in increased risk of fractures. It is classically divided into primary (post-menopausal or senile), secondary and idiopathic forms. There are many rare diseases, that cause directly or indirectly osteoporosis. The identification and classification of most of these rare causes of osteoporosis is crucial for the specialists in endocrinology and not, in order to prevent this bone complication and ...

  9. Conservation Actualities of Rare and Endangered Plants in Anhui Tianma National Nature Reserve and Coping Strategies%安徽天马国家级自然保护区珍稀濒危植物保护现状及对策

    Institute of Scientific and Technical Information of China (English)

    邓勇; 浦发光

    2015-01-01

    There are 22 national -protected rare and endangered plant species in Anhui Tianma National Nature Reserve, including 10 key national-protected plant species(1 first-class species, 9 second-class species) and 18 rare and endangered species (5 second-class species, 13 third-class species). Aimed at the existing problems facing the rare and endangered species including their narrow distribution areas, low population densities, low natural regeneration abilities and frequent human disturbance, multiple measures should be taken in the reserve to strengthen conservation to the rare and endangered plant species including publicity and education, integrated management, dynamic monitoring, artificial breeding and adjustment of industrial structure.%安徽天马国家级自然保护区共有国家珍稀濒危保护植物22种,其中国家重点保护野生植物10种(Ⅰ级1种,Ⅱ级9种),珍稀濒危植物18种(2级5种,3级13种)。针对保护区内国家珍稀濒危保护植物面临分布区域狭窄、种群密度低、自然更新能力弱、人为干扰频繁等问题,提出了保护区应通过宣传教育、综合管理、动态监测、人工繁育、产业结构调整等对策,加大对珍稀濒危植物的保护力度。

  10. CHARACTERISTICS AND CONSERVATION PRIORITY OF RARE AND ENDANGERED PLANTS IN THE SUBTROPICAL AREA OF GUIZHOU PROVINCE%贵州亚热带地区稀有濒危植物分布特征及优先保护等级

    Institute of Scientific and Technical Information of China (English)

    代正福; 周正邦

    2000-01-01

    Of the 93 species of rare and endangered plants in the subtropical area of Guizhou Province, 1/3 belong to the four families of Pinaceae, Magnoliaceae, Palmaeceae and Hamamelideceae which have relative high economic values; 31.50% of the rare and endangered plants take forests as habitats; and 82.80% of the plants are threatened due to destruction of their forest habitats. This showed that human disturbances constitute the principal factor threatening subtropical plants in Guizhou and eco-environmental protection has become an effective way to preserve rare and endangered plants in the region. According to current resources situation, the rare and endangered plants in the region can be divided into five grades for protection. Of them 10 species endemic to Guizhou are given first priorities for protection and effective measures should be taken in action.%贵州亚热带地区共有93种稀有濒危植物。其中,具有较高经济价值的松科、木兰科、棕榈科、金缕梅科4个科植物略占1/3;以森林为生境的稀有濒危植物占31.50%;因生境破坏而受到威胁的植物达82.80%。表明人类干扰是贵州亚热带地区植物受威胁的主要因素,保护生态环境成为保护贵州亚热带地区稀有濒危植物的主要途径。根据区内的资源现状,可将该区的稀有濒危植物分为5个保护等级,其中10种为优先保护对象。

  11. 珍稀濒危药用植物川西獐牙菜的资源调查%Resources Survey on Rare and Endangered Medicinal Plant Swertia mussotii Franch

    Institute of Scientific and Technical Information of China (English)

    赵纪峰; 刘翔; 王昌华; 张植伟; 秦松云; 钟国跃

    2014-01-01

    采取文献调查、走访调查、样方调查及市场调查等方法,对西藏、青海、四川等省自治区珍稀濒危药用植物川西獐牙菜进行相关调查,结果表明,川西獐牙菜主要分布在西藏的左贡、芒康,青海的玉树,四川的石渠、道孚、康定、马尔康、金川、小金。从分布海拔来看,可以从2300 m(四川康定)一直到3900 m(西藏芒康),在相对高度为2600 m的变化范围内都有分布。光照、水分、土壤、温度、海拔等因素从不同的角度对川西獐牙菜的分布和生长、资源蕴藏量都有着明显的影响。近年来,作为藏药“藏茵陈”的川西獐牙菜市场需求增长迅速,滥采滥挖是导致近年川西獐牙菜资源急剧减少的主要原因。建议一方面应加强对川西獐牙菜的合理限量采挖管理,同时应开展川西獐牙菜资源利用价值的评价,并加快发展川西獐牙菜的栽培生产。%The resource of rare and endangered medicinal plant Swertia mussotii Franch. in Tibet, Qinghai and Sichuan province were surveyed by ways of documents, interview, quadrat and market investigation. The results indi-cated that Swertia mussotii Franch. mainly distributed in Zuogong and Mangkang of Tibet, Yushu of Qinghai province, Shiqu, Daofu, Kangding, Maerkang, Jinchuan and Xiaojin of Sichuan province. According to the height above sea level, the distribution altitude was from 2 300 m (Kangding of Sichuan province) to 3 900 m (Mangkang of Tibet). There are distributions of Swertia mussotii Franch. within the scope of 2 600 m. The illumination, water, soil, temperature and altitude had significant influence on the distribution, growth and reserve of Swertia mussotii Franch. from different angles. In recent years, there was huge increase of market requirement in Swertia mussotii Franch. which were used in Tibetan medicine "Zangyinc he n". Excess collection was the primary cause of rapid decreasing in resource

  12. Megasporogenesis, Microsporogenesis and Development of Gametophytes in the Rare Endangered  Plant Manglietia patungensis Hu%珍稀濒危植物巴东木莲胚胎学研究

    Institute of Scientific and Technical Information of China (English)

    陈发菊; 李凤兰; 梁宏伟; 姚露; 何正权

    2008-01-01

    对巴东木莲(Manglietia patungensis Hu)的花发育以及胚胎发育过程进行了系统研究.巴东木莲花顶生,花器官头年年底开始分化到第二年3月分化出花被、雌雄蕊群直至6月发育成熟.雌蕊成熟时胚珠倒生,双珠被,厚珠心,大孢子四分体线形排列,合点端发育成功能大孢子,珠孔端的3个退化,大孢子为单孢子发生型,胚囊发育方式属蓼型;雄蕊花药外侧壁玫瑰红色,内侧有4个白色花粉囊,绒毡层有1层多核细胞,小孢子四分体排列方式多为左右对称形和交叉形,四面体形,偶为T字形和线形,成熟花粉粒为二细胞型.在巴东木莲花发育和大、小孢子发生以及雌、雄配子体形成过程中未见异常现象,因此笔者认为该物种的花器官发育以及雌、雄配子体发育并不构成导致该物种濒危的因素.%A detailed morphological description of megasporogenesis, microsporogenesis, and develop-ment of the male and female gametophytes in the rare endangered plant Manglietia patungensis Hu is presented for the first time after three-year' s continuous investigation. The ovule is anatropous, biteg-mic, crassinucellate and with a obturator. No irregularities have been found in the process from the dif-ferentiation of archespofial cells to the tormation of megaspores. The megaspore mother cells undergo mi-osis and develop into a linear tetrad. The large one at chalazal end is functional megaspore and devel-oped into a polygonum type of embryo sac after the third mitotic division. Each anther of M. patungensis Hu with four sacs, a mature anther wall successively comprises an epidermis, endothecium, two-layered middle layer and one or two-layered glandular tapetum. The meioses of microspore mother cell is normal and cytokinesis is modified simultaneous type, and tetrads are tetrahedral, decussate and isoblateral, oc-cassionally linear. The pollen grains are monocolpate and two-celled at shedding and the pollen grains

  13. A rare splenic pseudocyst

    Science.gov (United States)

    Verma, Ankit; Yadav, Amit; Sharma, Sourabh; Saini, Devender; Om, Prabha; Khoja, Hanuman; Banerjee, Kinjal; NL, Harish

    2013-01-01

    Pseudocysts of the spleen are very rare, found in <1% of the splenectomies done and usually develop secondary to trauma. Pseudocysts of spleen rarely grow to large size and most of these remain asymptomatic, they require exploration only in symptomatic cases and chances for spleen preservation in these cases are usually less. Here, we present two cases of this rare entity developing secondary to abdominal trauma in the past, both presented with complaints of pain and lump in the abdomen. After thorough investigations, laparotomy was done preserving spleen in one case and doing splenectomy in the other. On histopathological examination, diagnosis of splenic pseudocysts was confirmed by the absence of lining epithelium. We would like to report these two cases because of their rarity and as diagnostic dilemmas. PMID:24963908

  14. Rare (Earth Elements [score

    Directory of Open Access Journals (Sweden)

    Camilo Méndez

    2014-12-01

    Full Text Available Rare (Earth Elements is a cycle of works for solo piano. The cycle was inspired by James Dillon’s Book of Elements (Vol. I-V. The complete cycle will consist of 14 pieces; one for each selected rare (earth element. The chosen elements are Neodymium, Erbium, Tellurium, Hafnium, Tantalum, Technetium, Indium, Dysprosium, Lanthanium, Cerium, Europium, Terbium, Yttrium and Darmstadtium. These elements were selected due to their special atomic properties that in many cases make them extremely valuable for the development of new technologies, and also because of their scarcity. To date, only 4 works have been completed Yttrium, Technetium, Indium and Tellurium.

  15. Rare decays at LHCb

    CERN Document Server

    Lafferty, George

    2015-01-01

    We review recent results from the LHCb experiment on studies of particle decays that are forbidden or rare in the Standard Model. The studies include searches for lepton flavour violating decays of the $\\tau$ lepton and the $B$ and $D$ mesons, and of $B$ and $D$ meson decays that would be mediated by Majorana neutrinos. Results are also presented for the rare processes $B_s \\to \\mu^+\\mu^-$ and $B^0 \\to \\mu^+\\mu^-$, $D^0 \\to \\pi^+\\pi^-\\mu^+\\mu^-$, $b \\to s\\gamma$ transitions, and $B \\to K^{(*)}\\mu^+\\mu^-$.

  16. Magnetic rare earth superlattices

    DEFF Research Database (Denmark)

    Majkrzak, C.F.; Kwo, J.; Hong, M.;

    1991-01-01

    Advances in molecular beam epitaxy deposition techniques have recently made it possible to grow, an atomic plane at a time, single crystalline superlattices composed of alternating layers of a magnetic rare earth, such as Gd, Dy, Ho, or Er, and metallic Y, which has an identical chemical structure...

  17. Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    @@ Rare earth market continued drop tendency.There was not much transaction of didymium oxide and the alloy. Affected by reduced order of NdFeB magnetic materials and inactive dealings of didymium mischmetal,price of didymium mischmetal had dropped from RMB ¥95,000~98,000/ton to RMBY 93,000~95,000/ton currently.

  18. Afganistan and rare earths

    Directory of Open Access Journals (Sweden)

    Emilian M. Dobrescu

    2013-05-01

    Full Text Available On our planet, over a quarter of new technologies for the economic production of industrial goods, are using rare earths, which are also called critical minerals and industries that rely on these precious items being worth of an estimated nearly five trillion dollars, or 5 percent of world gross domestic product. In the near future, competition will increase for the control of rare earth minerals embedded in high-tech products. Rare minerals are in the twenty-first century what oil accounted for in the twentieth century and coal in the nineteenth century: the engine of a new industrial revolution. Future energy will be produced increasingly by more sophisticated technological equipment based not just on steel and concrete, but incorporating significant quantities of metals and rare earths. Widespread application of these technologies will result in an exponential increase in demand for such minerals, and what is worrying is that minerals of this type are almost nowhere to be found in Europe and in other industrialized countries in the world, such as U.S. and Japan, but only in some Asian countries, like China and Afghanistan.

  19. Primary Study on Effects of New Rare Earth Agro-Materials on Potato

    Institute of Scientific and Technical Information of China (English)

    Yang Qifeng; Mao Wanhu; Wang Jiachen; Xing Guo; Yang Jun; Liu Xiangsheng

    2004-01-01

    Using common phosphate as a check, we studied the growth and yield of potato by new rare earth agro-materials including rare earth phosphate (base fertilizer), rare earth whole plant nutrient fertilizer, and amino acid chelated rare earth ( top dressing), which were used in a single or mixed way in Dingxi city, Gansu Province.The results are as follows that ( 1 ) After using new rare earth materials, the plant height increases by 0.4 ~ 5.6 cm and the ripen period is delayed by 4 ~ 9 d.(2) They can improve the potato economic characteristics, enhance productivity, decrease black leg and late blight.The disease index is decreased by 1.6% ~ 10.6%, single plant potato number increases by 0.3 ~ 0.5, and single plant yield increases by 80 g ~ 130 g.(3) The effect of increased yield is significant, and mixed use is better than single use.In the single material treatments, rare earth phosphate is the best, rare earth whole plant nutrient fertilizer and amino acid chelated rare earth are the second, and the increased rate are 14.5%, 8.4%, 9.2% so the material mixture-rare earth phosphate mixed of rare earth whole plant nutrient fertilizer or with amino acid chelated rare earth is economically useable, and increase rate are 25.2% and 24.4% compared with common phosphate.

  20. Rare event simulation using Monte Carlo methods

    CERN Document Server

    Rubino, Gerardo

    2009-01-01

    In a probabilistic model, a rare event is an event with a very small probability of occurrence. The forecasting of rare events is a formidable task but is important in many areas. For instance a catastrophic failure in a transport system or in a nuclear power plant, the failure of an information processing system in a bank, or in the communication network of a group of banks, leading to financial losses. Being able to evaluate the probability of rare events is therefore a critical issue. Monte Carlo Methods, the simulation of corresponding models, are used to analyze rare events. This book sets out to present the mathematical tools available for the efficient simulation of rare events. Importance sampling and splitting are presented along with an exposition of how to apply these tools to a variety of fields ranging from performance and dependability evaluation of complex systems, typically in computer science or in telecommunications, to chemical reaction analysis in biology or particle transport in physics. ...

  1. Study on Species and Distribution of Flora of National Rare and Endangered Medicinal Plant in the Three Gorges Area%三峡地区国家珍稀濒危重点保护药用植物种类分布及区系的研究

    Institute of Scientific and Technical Information of China (English)

    陈绍成

    2013-01-01

    根据《中国植物红皮书》和《国家重点保护野生植物名录》,对分布于三峡地区的国家珍稀濒危保护药用植物进行了调查和统计分析,并探讨了其区系成分及地理分布特征.结果表明,三峡地区有珍稀濒危及国家保护药用植物共计46科81属97种,其药用植物区系垂直分布明显,水平分布间断、交叠;古老孑遗药用植物众多;具有明显的温带性质,喜温暖湿润的山沟和山坡;乔木药用植物所占比例远远大于草本、藤本、灌木、蕨类药用植物;特有及单种属比例较大.%According to the China Plant Red Data Book and National Key Protected Wild Plants,the distribution of the rare and endangered plants and national conservative plants in the Three Gorges area were investigated and statistically analyzed.Its floristic composition and characteristics of geographical distribution were explored.As a result,a total of 97 species of medicinal flora belonging to rare and endangered national protection plants were found in the Three Gorges area.They come from 81 genera of 46 families.Their vertical distribution is obvious and horizontal distribution has discontinuous overlap.There are many ancient relict medicinal plants in the Three Gorges area.These medicinal plants have obvious temperate characteristics,and are easily found at warm and moist ravines and hillsides;The proportion of tree is much higher than that of herb,vine,shrub and fern.Most of them belong to specific and monotypic genera.

  2. Recovery of radiogenic lead-208 from a residue of thorium and rare earths obtained during the operation of a thorium purification pilot plant; Separacao e recuperacao de chumbo-208 dos residuos de torio terras raras gerados na unidade piloto de purificacao de nitrato de torio

    Energy Technology Data Exchange (ETDEWEB)

    Seneda, Jose Antonio

    2006-07-01

    Brazil has a long tradition in thorium technology, from mineral dressing (monazite) to the nuclear grade thorium compounds. The estimate reserves are 1200,000. ton of ThO{sub 2}. As a consequence from the work of thorium purification pilot plant at Instituto de Pesquisas Energeticas e Nucleares-CNEN/IPEN-SP, about 25 ton of a sludge containing thorium and rare earths was accumulated. It comes as a raffinate and washing solutions from thorium solvent extraction. This sludge, a crude hydroxide named RETOTER contains thorium, rare earths and minor impurities including the radiogenic lead-208, with abundance 88.34 %. This work discusses the results of the studies and main parameters for its recovery by anionic ion exchange technique in the hydrochloric system. The isotope abundance of this lead was analyzed by high resolution mass spectrometer (ICPMS) and thermoionic mass spectrometer (TIMS) and the data was used to calculate the thermal neutron capture cross section. The value of {sigma}{gamma}{sup 0} = 14.6{+-}0.7 mb was found, quite different from the {sigma}{gamma}{sup 0} = 174.2 {+-} 7.0 mb measure cross section for the natural lead. Preliminary study for the thorium and rare earths separation and recovery was discussed as well. (author)

  3. Hawaii ESI: HABPT (Habitat and Plant Points)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive biological resource data for rare/native terrestrial plants in coastal Hawaii. Vector points in this data set represent rare/native...

  4. Japanese Rare Earth Market

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    Since China cancelled export rebate in May this year,prices of magnetic materials related rare earth productscontinuously rose. Increasing production cost is largelyattributed to investment in environmental protectionequipments. Prices of Nd and Dy metals rose 20~30% over thebeginning of this year.Price of Nd was USD 11.5 - 12/Kg from USD 9/Kg at theend of 2004, up 30%. Price of Dy rose to USD 65- 70/Kg fromUSD 50/Kg early this year, up 20%. Price of Pr climbed to USD13.5 - 14/Kg from USD 11/Kg, up 30%. Pri...

  5. Rare B Decays

    Energy Technology Data Exchange (ETDEWEB)

    Jackson, P.D.; /Victoria U.

    2006-02-24

    Recent results from Belle and BaBar on rare B decays involving flavor-changing neutral currents or purely leptonic final states are presented. Measurements of the CP asymmetries in B {yields} K*{gamma} and b {yields} s{gamma} are reported. Also reported are updated limits on B{sup +} {yields} K{sup +}{nu}{bar {nu}}, B{sup +} {yields} {tau}{sup +}{nu}, B{sup +} {yields} {mu}{sup +}{nu} and the recent measurement of B {yields} X{sub s}{ell}{sup +}{ell}{sup -}.

  6. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    @@ Active demands from downstream industry drove the price rise of rare earth products in Chinese domestic marketrecently, particularly didymium and dysprosium products. Prices of other rare earth products remained stable.

  7. Rare B decays at LEP

    CERN Document Server

    Kluit, P M

    2001-01-01

    The results of the LEP experiments for rare B decays will be reviewed, covering hadronic final states, radiative and other rare decays and results for the inclusive charmless branching ratio. (8 refs).

  8. Hunan Rare Earth Group Approved

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    <正>Following Guangdong,Guangxi,Fujian and Jiangxi,Hunan announced that it would consolidate its rare earth resources-the consolidation plan of Hunan Rare Earth Group has been approved. Consolidation of the rare earth industry of south China is in full swing.According to "Several Opinions of the State Council on Promoting the Sustainable and Healthy Development of Rare Earth Industry"(hereinafter referred to as "Several Opinions")released in 2011,

  9. A rare sight

    CERN Document Server

    Antonella Del Rosso and The LHCb Collaboration

    2012-01-01

    Today, at the Hadron Collider Physics Symposium in Kyoto, the LHCb collaboration has presented the evidence of a very rare B decay, the rarest ever seen. The result further shrinks the region in which scientists can still look for supersymmetry.   The graph showing evidence of the Bs0 → μ+ μ- decay. The result was presented Monday 12 November at the HCP Conference in Kyoto (photo courtesy of the LHCb Collaboration). Particle decays tell us about the inner properties and functioning of Nature’s physics processes. By studying them and their occurrence, physicists infer the rules that control them. Often, it turns out that some rare decays, which are very difficult to observe, are those in which Nature could reveal the presence of new physics. This is the case of some decays of the Bs0 particle (a particle made of a bottom anti-quark bound to a strange quark), and in particular Bs0 → μ+ μ- whose...

  10. Analysis of Suitable Growth Area and Habitat of Rare Plant Sinopodophullum hexandrum Based on GARP Niche Model%基于 GARP生态位模型的珍稀植物桃儿七适生区与生境分析

    Institute of Scientific and Technical Information of China (English)

    张海龙

    2013-01-01

    Sinopodophullum hexandrum (Royle) Ying is a rare and endangered traditional medical plant in China , and it was listed as the national third -level protected plant.According to 143 geographical distribution records of Sinopodophullum hexandrum and 24 environmental map layers, we analyzed the potential geographical distribution of this rare plant in China through using GARP niche model.The results showed that the suitable habitat area of Sinopodophullum hexandrum in China was 692627.20 km2 , its growth areas were very narrow, and this species was very strict to growth environment .Sinopodophullum hexandrum distributed mainly in Qinghai, Gansu, Sichuan, Yunnan, Ningxia, Shaanxi and the high -altitude areas of Tibet with rich secondary vegetation and complex terrain.%  桃儿七[Sinopodophullum hexandrum(Royle)Ying.]是我国传统珍稀药用植物,现已处于濒危状态,被列为国家三级保护植物。利用获得的143个桃儿七地理分布记录和24个环境图层,通过GARP生态位模型分析了桃儿七在我国潜在地理分布,结果表明:桃儿七的适宜生境在我国的总面积为692627.20 km 2,该物种生长区域狭窄,对环境要求苛刻,主要分布在我国西部的青海、甘肃、四川、云南、宁夏、陕西以及西藏境内次生植被丰富、地形复杂的高海拔地区。

  11. Organizational learning in rare events

    DEFF Research Database (Denmark)

    Andersen, Kristina Vaarst; Beukel, Karin; Tyler, Beverly

    In this paper we build a theoretical framework for understanding whether and how firms learn from the rare event of litigating intellectual property cases. We draw on literature on organizational learning from rare events and examine the conditions under which firms can learn from rare events. We...

  12. Abundance distribution of common and rare plant species of Brazilian savannas along a seasonality gradient Distribuição de abundâncias de espécies de plantas comuns e raras de savanas brasileiras ao longo de um gradiente de estacionalidade

    Directory of Open Access Journals (Sweden)

    Igor Aurélio Silva

    2010-06-01

    Full Text Available We examined the species abundance distribution (SAD of plant communities in: (1 a wet grassland, waterlogged throughout most of the year; (2 a seasonal savanna, with an annual dry season; and (3 a hyperseasonal savanna, with alternating drought and waterlogging over the year. We searched for differences in the abundance distributions of all species, as well as of the common and rare species. We tested whether the SADs fitted the lognormal, log-series, power fraction, and random assortment models. We found that environmental constraints may reduce the evenness of plant communities and change the SADs in savannas. We observed a lognormal abundance distribution in the wet grassland and a random abundance distribution in the hyperseasonal cerrado. The SAD of the seasonal savanna did not follow any model. The common species in the three communities were better fitted by the lognormal model. The rare species in the wet grassland and the hyperseasonal cerrado were better fitted by the random assortment model. The SAD of the rare species of the seasonal savanna did not follow any model. Seasonality seems to modify the lognormal distribution of the overall plant community, generating abundance distributions indistinguishable from random. However, differential community structuring between common and rare species may not be affected by seasonality. The different signatures of the abundance distributions of common and rare plants indicate that composite models are better predictors for SADs in savannas.Examinamos as distribuições de abundâncias de espécies (DAEs de comunidades de plantas em: (1 um campo úmido, alagado durante a maior parte do ano; (2 uma savana estacional, com uma estação seca anual; e (3 uma savana hiper-estacional, com uma estação seca e um alagamento alternantes durante o ano. Procuramos por diferenças na distribuição de abundância de todas as espécies, bem como das espécies comuns e raras. Testamos se as DAEs se

  13. Effect of Rare Earths on Plants under Supplementary Ultraviolet-B Radiation: Ⅱ. Effect of Cerium on Antioxidant Defense System in Rape Seedlings under Supplementary Ultraviolet-B Radiation

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Effects of cerium (Ce3 + ) on membranous protective enzymes in rape seedlings exposed to two levels of enhanced ultraviolet-B radiation (UV-B, 280 ~ 320 nm) were studied by hydroponics in the laboratory. The results show that the chlorophyll content decreases and membrane permeability increases in the leaves under UV-B irradiation with an intenposed to a low level of UV-B radiation. POD activity in leaves exposed to a high level of UV-B radiation is enhanced constantly. The sensitivities of these enzymes to UV-B radiation are SOD > CAT > POD. The injury by UV-B radiation on the functions of protective enzymes is lightened, their ability to scavenge radicals is improved, and the membrane permeability is maintained by Ce. Furthermore, the protective effect of cerium is more obvious in plants exposed to low levels of UV-B radiation than to high levels of it. Accordingly, all results prove that the protective effect of Ce on plants under UV-B radiation is realized through the protective system of plants.

  14. Value of Development & Utilization of Rare & Endangered Plants Davidia involucrata in Lushan Mountain%濒危珍稀植物珙桐在庐山开发利用的价值

    Institute of Scientific and Technical Information of China (English)

    陈树青; 陈俊文; 刘建军; 刘明

    2012-01-01

    In order to change the status that there was too large area of artificial coniferous forests,single forest form in the forest resources of Lushan Mountain,the rare endangered trees Davidia involucrata was selected as tree species for adjusting the forest form.A lot of pre-trial experimental on the growth,reproduction,cultivation of D.involucrata was made by the author,and feasibility results were obtained.It was promoted in the some viewpoints of Lushan Mountain.And it can not only help the protection and development of rare endangered ornamental tree D.involucrata,and it can help improve forest landscape and adjust the forest form of Lushan Mountain,so it will have important significance on protecting the world's cultural landscape.%为改变庐山森林资源中人工针叶林面积偏大、林相单一的现状,选择阔叶珍稀树中珙桐等作为调整林相树种。笔者对珙桐树的生长、繁殖、栽培开发做了大量前期试验工作,取得可行性效果。目前已在庐山各景区推广。此项工作的开展,既有利于濒危植物珙桐观赏树的保护开发,又有利于改善庐山森林景观和林相结构调整,将对保护世界文化景观产生重要意义。

  15. 江西铜矿及冶炼厂周边土壤和农作物稀土元素含量与评价%Rare Earth Elements Content in Farmland Soils and Crops of the Surrounding Copper Mining and Smelting Plant in Jiangxi Province and Evaluation of Its Ecological RisK

    Institute of Scientific and Technical Information of China (English)

    金姝兰; 向猛; 黄益宗; 王斐; 徐峰; 王小玲; 高柱; 胡莹; 乔敏; 李季

    2015-01-01

    研究江西省铜矿开采和冶炼对周边农田土壤、农作物稀土元素含量的影响.结果表明,铜矿开采和冶炼可提高土壤及农作物稀土元素的含量.德兴银山铅锌铜矿和贵溪冶炼厂周边农田土壤中总稀土元素含量范围分别为112.42~397.02 mg·kg-1和48.81~250.06 mg·kg-1,总稀土元素平均值分别为254.84 mg·kg-1和144.21 mg·kg-1,分别是江西省背景值的1.21倍和0.68倍,全国背景值的1.36倍和0.77倍,对照样点的3.59倍和2.03倍.贵溪冶炼厂周边10种农作物样品中总稀土元素含量范围为0.35~2.87 mg·kg-1,作物叶子中的稀土元素含量高于茎和块根.番茄、空心菜叶和萝卜叶中总稀土元素含量分别为2.87、1.58和0.80 mg·kg-1,均超过我国蔬菜和水果卫生标准的总稀土元素含量限值(0.70 mg·kg-1).矿区居民终身摄入稀土元素的总量为17.72μg·( kg·d)-1,低于安全剂量和临界值,对人体还不构成健康风险.研究结果说明在江西进行铜矿开采和冶炼时必须重视稀土元素对周边环境的影响.%Rare earth elements content in farmland soils and crops of the surrounding copper mining and smelting plant in Jiangxi province was studied. The results showed that copper mining and smelting could increase the content of rare earth elements in soils and crops. Rare earth elements content in farmland soils of the surrounding Yinshan Lead Zinc Copper Mine and Guixi Smelting Plant varied from 112. 42 to 397. 02 mg·kg -1 and 48. 81 to 250. 06 mg·kg-1 , and the average content was 254. 84 mg · kg -1 and 144. 21 mg·kg-1 , respectively. The average contents of rare earth elements in soils in these two areas were 1. 21 times and 0. 68 times of the background value in Jiangxi province, 1. 36 times and 0. 77 times of the domestic background value, 3. 59 times and 2. 03 times of the control samples, respectively. Rare earth elements content in 10 crops of the surrounding Guixi Smelting Plant varied from 0. 35

  16. A Rare Stapes Abnormality

    Directory of Open Access Journals (Sweden)

    Hala Kanona

    2015-01-01

    Full Text Available The aim of this study is to increase awareness of rare presentations, diagnostic difficulties alongside management of conductive hearing loss and ossicular abnormalities. We report the case of a 13-year-old female reporting progressive left-sided hearing loss and high resolution computed tomography was initially reported as normal. Exploratory tympanotomy revealed an absent stapedius tendon and lack of connection between the stapes superstructure and footplate. The footplate was fixed. Stapedotomy and stapes prosthesis insertion resulted in closure of the air-bone gap by 50 dB. A review of world literature was performed using MedLine. Middle ear ossicular discontinuity can result in significant conductive hearing loss. This can be managed effectively with surgery to help restore hearing. However, some patients may not be suitable or decline surgical intervention and can be managed safely conservatively.

  17. Rarely clicking Muller's ratchets

    Science.gov (United States)

    Eule, Stephan; Metzger, Jakob

    2013-03-01

    In populations of finite size, weakly deleterious mutations can fix by chance. This phenomenon has been termed Muller's ratchet and one click of the ratchet refers to the loss of the fittest class of individuals with the fewest mutations. Despite the simplicity of the classical mathematical model of Muller's ratchet, surprisingly little is known in the biologically relevant regime where a click of the ratchet is a rare event. Here we show numerically that in this regime the rate of the ratchet strongly depends on the applied microscopic formulation (Wiright-Fisher/Moran) of the model, thus challenging the widely used diffusion approximation. Furthermore by employing a WKB-approximation in a simplified model, we obtain analytical results for the click rate, which agree well with the click rate of the full ratchet of the corresponding microscopical model.

  18. Rare cancers are not so rare: The rare cancer burden in Europe

    NARCIS (Netherlands)

    Gatta, Gemma; Zwan, van der Jan Maarten; Casali, Paolo G.; Siesling, Sabine; Dei Tos, Angelo Paolo; Kunkler, Ian; Otter, Renee; Licitra, Lisa

    2011-01-01

    Purpose: Epidemiologic information on rare cancers is scarce. The project Surveillance of Rare Cancers in Europe (RARECARE) provides estimates of the incidence, prevalence and survival of rare cancers in Europe based on a new and comprehensive list of these diseases. Materials and methods: RARECARE

  19. Substitutos do " novo" mundo para as antigas plantas raras: um estudo de caso dos bálsamos " New" world substitutes for ancient rare plants: a study case on balsams

    Directory of Open Access Journals (Sweden)

    Ana Maria Alfonso-Goldfarb

    2010-01-01

    Full Text Available Convinced that the " true balsam" was lost forever, Conrad Gesner described other substances with similar healing virtues. However, he was not the only one in the 16th to search for other varieties of balsamic oleoresins. The arrival of the Europeans to the Americas allowed the finding of native plants with properties similar to those of the original balsam, including Balsam of Peru, Balsam of Tolu and particularly in the Brazilian area, Balsam of Copaiba. Focusing on the Brazilian context, this paper analyzes two different moments in the transit of the newly found varieties of balsams to the pharmacopeia and materia medica.

  20. Effect of Rare Earths on Plant under Supplementary Ultraviolet-B Radiation: Ⅰ Effect of Cerium on Growth and Photosynthesis in Rape Seedlings Exposed to Supplementary Ultraviolet-B Radiation

    Institute of Scientific and Technical Information of China (English)

    Liang Chanjuan; Huang Xiaohua; Zhou Qing

    2005-01-01

    Effect of cerium (Ce3+) on growth and photosynthesis in rape seedlings exposed to two levels of ultraviolet-B radiation (UV-B, 280~320 nm) was studied with hydroponics under laboratory conditions. The growth of rape seedlings exposed to two levels of UV-B irradiation (0.15 and 0.35 W*m-2/T2) was both heavily restrained. The aboveground growth indices including stem (plant) height, leaf number, leaf area, leaf fresh/dry weight and stem fresh/dry weight were obviously decreased by 13.2%~44.1% (T1) and 21.4%~49.3% (T2). Compared to CK, and except active absorption area of roots, the belowground indices main root length, root volume and fresh/dry weight by 14.1%~35.6% (T1) and 20.3%~42.6% (T2), respectively. For Ce+UV-B treatments, the aboveground and belowground growth indices were decreased by 4.1%~23.6%, 5.2%~23.3% (Ce+T1) and 10.8%~28.4%, 7.0%~27.8% (Ce+T2), lower than those of UV-B treatments mentioned above. These results show that Ce has protective effect on plant against injury of UV-B radiation. Furthermore, the protective effect of Ce on seedlings exposed to T1 level of UV-B radiation is superior to T2 level. Chlorophyll content, net photosynthesis rate, transpiration rate, stomatal conductance and water use efficiency in UV-B treatments decrease dramatically, whereas intercellular CO2 concentration increases. Although these indices in Ce+UV-B treatments decrease compared with those of CK, the decrease in Ce+UV-B treatments are lower than those in UV-B treatment. This phenomenon indicates that the ecophysiological protective effect of Ce is based on improving photosynthesis in plants. The dynamic curves of photosynthesis indices show that the course of light-repair is shortened and the injury to rape seedlings by UV-B radiation stress is alleviated by Ce.

  1. PATIENT REGISTRIES FOR RARE DISEASES

    Directory of Open Access Journals (Sweden)

    Mariela Deliverska

    2016-06-01

    Full Text Available Rare diseases are diseases with a particularly low prevalence. The specificities of rare diseases - limited number of patients and scarcity of relevant knowledge and expertise - single them out as a distinctive domain of very high added value. The international reference for classification of diseases and conditions is the International Classification of Diseases (ICD, coordinated by the World Health Organization (WHO. Patient registries and databases constitute key instruments for the development of clinical research in the field of rare diseases. Rare disease registries include not only diseases that are inherently rare, but also common diseases that are rare in specific populations, especially those defined by demographics. Disease registries create the possibility of assessing the long-term safety and benefit of different treatments, perhaps leading to treatment algorithms that allow more choices for patients and clinicians.

  2. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    June 20-30 2012 Affected by a sustained slump in the demand from downstream industries, rare earth market remained flat recently. There were not many inquiries for rare earth products in the spot market. Consumers lacked of confidence in the future market. As for the downstream industries, the market of NdFeB magnetic materials and phosphors were in the doldrums. Ceramic, catalyst and polishing powder industries maintained weak. Affected by the global economy, export market of rare earth was weak.

  3. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Rare earth market remained weak recently. Dealings of light and heavy rare earth products were sluggish. Demand for didymium and dysprosium related products was soft and purchasers were not interested in replenishing their stocks. The market of NdFeB magnetic materials and phosphors remained inactive. Meanwhile, ceramic, catalyst and polishing powder industries were weak. Affected by global economical recession, export market of rare earth remained weak.

  4. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Rare earth market was weak recently. There was still no sign of recovery in NdFeB magnetic materials and phosphors market. The market of ceramic, catalyst and polishing powder were in the doldrums. Rare earth deep processing enterprisers hesitated to purchase rare earth products and considered that there was room for further price reduction. Global economy slowed down and there was no sign of improvement yet. The export market was sluggish and transactions were inactive.

  5. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Rare earth market was relatively stable recently. There was not much change to the quotations by suppliers. Inquiries for most products increased in spot market and so did to the transactions. Recently, rare earth special invoices attracted the attention in the industry again. It is likely to result in price rise of many rare earth products if the special invoice system can put into effect in the near term.

  6. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    October 21-31,2012 Recently, dealings of rare earth remained stagnant. Consumers hesitated to increase their stocks for the fear of further decline in rare earth prices. It was difficult for suppliers to sell products and they had reduced quotations to attract buyers. It did not show demand from end users could rebound in short terms. Dealings of rare earth products in spot market were few. The market of NdFeB magnetic materials, phosphors, catalysts, polishing powders and ceramics remained sluggish. There was no sign of picking up in world economy. Export market of rare earths maintained inactive.

  7. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Rare earth market remained sluggish and quiet holistically recently. Didymium-related market was quiet and the consumers were hesitating in replenishing their inventories. Inquiries for dysprosium-related products were few and the transactions were inactive, Demand for europium oxide (99.99%) was weak and the trade was far from brisk. Baogang Rare Earth suspended production, which has a positive effect in stabilizing the whole rare earth market. But prices of rare earth products did not go up rapidly. This means there were still large inventories in the market.

  8. Rare times rare: The hyponatremia, rhabdomyolysis, anterior compartment syndrome sequence.

    Science.gov (United States)

    Dubin, Ina; Gelber, Moshe; Schattner, Ami

    2016-05-01

    Primary polydipsia occurs in up to 25% of patients with chronic psychiatric disorders (especially schizophrenia), related to the disease, its treatment or both. Urine output fails to match intake >10 L/day and water intoxication may develop. Rhabdomyolysis is a rare complication of hyponatremia, and an acute anterior compartment syndrome of the leg, an emergency, may be very rarely associated.

  9. China's rare-earth industry

    Science.gov (United States)

    Tse, Pui-Kwan

    2011-01-01

    Introduction China's dominant position as the producer of over 95 percent of the world output of rare-earth minerals and rapid increases in the consumption of rare earths owing to the emergence of new clean-energy and defense-related technologies, combined with China's decisions to restrict exports of rare earths, have resulted in heightened concerns about the future availability of rare earths. As a result, industrial countries such as Japan, the United States, and countries of the European Union face tighter supplies and higher prices for rare earths. This paper briefly reviews China's rare-earth production, consumption, and reserves and the important policies and regulations regarding the production and trade of rare earths, including recently announced export quotas. The 15 lanthanide elements-lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium (atomic numbers 57-71)-were originally known as the rare earths from their occurrence in oxides mixtures. Recently, some researchers have included two other elements-scandium and yttrium-in their discussion of rare earths. Yttrium (atomic number 39), which lies above lanthanum in transition group III of the periodic table and has a similar 3+ ion with a noble gas core, has both atomic and ionic radii similar in size to those of terbium and dysprosium and is generally found in nature with lanthanides. Scandium (atomic number 21) has a smaller ionic radius than yttrium and the lanthanides, and its chemical behavior is intermediate between that of aluminum and the lanthanides. It is found in nature with the lanthanides and yttrium. Rare earths are used widely in high-technology and clean-energy products because they impart special properties of magnetism, luminescence, and strength. Rare earths are also used in weapon systems to obtain the same properties.

  10. Webbed penis: a rare case.

    Science.gov (United States)

    Agrawal, R; Chaurasia, D; Jain, M

    2010-01-01

    Webbed penis belongs to a rare and little-known defect of the external genitalia. The term denotes the penis of normal size for age hidden in the adjacent scrotal and pubic tissues. Though rare, it can be treated easily by surgery. A case of webbed penis is presented with brief review of literature.

  11. Phase stable rare earth garnets

    Energy Technology Data Exchange (ETDEWEB)

    Kuntz, Joshua D.; Cherepy, Nerine J.; Roberts, Jeffery J.; Payne, Stephen A.

    2013-06-11

    A transparent ceramic according to one embodiment includes a rare earth garnet comprising A.sub.hB.sub.iC.sub.jO.sub.12, where h is 3.+-.10%, i is 2.+-.10%, and j is 3.+-.10%. A includes a rare earth element or a mixture of rare earth elements, B includes at least one of aluminum, gallium and scandium, and C includes at least one of aluminum, gallium and scandium, where A is at a dodecahedral site of the garnet, B is at an octahedral site of the garnet, and C is at a tetrahedral site of the garnet. In one embodiment, the rare earth garment has scintillation properties. A radiation detector in one embodiment includes a transparent ceramic as described above and a photo detector optically coupled to the rare earth garnet.

  12. Evidence-based innovative therapeutic medicine of Cretan plants: some encouraging specific functions and claims.

    Science.gov (United States)

    Lionis, Christos

    2015-01-01

    The Island of Crete was the place where the use of herbal medicine has its roots since the Bronze Age period. Although, the consumption of aromatic plants as component in curing common diseases is still on population's practices, a new interest was appeared on the basis of studies with a focus on illness behavior as a mutual collaboration between the University of Crete and the University of Leiden, The Netherlands. The antioxidant activity of certain Cretan plants has been documented and it has been shown and reported that herbal extracts are possible to decrease lipid per oxidation in cultured lung cells exposed to iron or ozon. The biological effects and bioactivity of essential oils as well as their antibacterial properties have been previously discussed in the literature. However, it was the first attempt in Europe when a double blind randomized controlled trial examined the effectiveness of an essential-oil extract of three Cretan aromatic plants (Origanum Dictamnus, Coridothymus Capitatus, Salvia Friticosa) designed and implemented in rural Crete on patients with upper respiratory tract infection. Descriptive differences were recently reported in favorable direction especially in the virus-positive population, while these results guide at the moment a series of actions for further research and discussion on the potentialities in the therapeutic medicine. An over-the-counter drug under the name of "Cretan Iama" and as soft-gel capsules has recently circulated in Greece by the Olvos Science SA. A recent joint attempt (Clinic of Social and Family Medicine and Department of Experimental Endocrinology at the School of Medicine, University of Crete) under the support of the National Strategic Reference Framework Program focused on the effectiveness of functional extract of Mentha Spicata encapsulated in yogurt with honey on lipids profile of health patients in rural Crete. The first reported results of a cross-over study which was designed and implemented recently

  13. Study on community of rare and endangered plant Davidia involucrate in Hupingshan Nature Reserve of Hunan province%壶瓶山自然保护区珍稀濒危植物珙桐群落的研究

    Institute of Scientific and Technical Information of China (English)

    刘海洋; 金晓玲; 薛会雯; 张程; 石求辉; 张日清

    2011-01-01

    The resources and community structure of Davidia involucrata in Hupingshan Nature Reserve of Hunan province were studied by using the sample plot method. The results show that: (1) There were 65 vascular plant species in the community belonging to 37 families and 59 genera. The composition of Davidia involucrata community mainly consists of the East Asia distribution, the rate reached to 27.1% (16 genera), and the next was North Temperate distribution, about 20. 3% (12 genera). The component of species had the typical characteristics that it is from the subtropics to the temperate zone. (2) The community vertical structure was simple, which composed of tree layer, shrub layer, herb layer and interlayer plant. Herb layer grew better than tree layer and shrub layer. In term of life form, 32. 3% phanerophytes were on the top, the composition of life form was similar to that in subtropical evergreen and deciduous forest. (3) The importance value of Davidia involucrata was 70. 3, The Simpson and Shannon-wiener diversity indices in herb layer were higher than that in tree layer and shrub layer. The Pielou indexs (Jsw and Js) in tree layer were higher than herb layer and shrub layer. (4) According to the age structure.It's indicated that Davidia involucrata community in Hupingshan Nature Reserve had not yet developed into its climax, and the spatial pattern of the whole population was of clumping distribution. Natural regeneration ability of Davidia involucrata was weak and seed germination was low, and seedling rate was less, the forest rehewal was given priorty to shooting.%为了解湖南省壶瓶山自然保护区内野生珙桐资源的分布和植物群落情况,采用样方调查法,对野生珙桐资源的分布、植物群落特点和生境进行了调查研究.结果表明:(1)珙桐群落中共有维管束植物65种,隶属37科59属.植物区系组成以东亚分布最多,达16属,占27.1%.其次是北温带分布,共12属,占20.3%.珙桐群落区系的

  14. Processing of rare earth concentrates

    Institute of Scientific and Technical Information of China (English)

    Pamela Alex; R. C. Hubli; A.K. Suri

    2005-01-01

    The paper describes process details for extraction of rare earths from an intermediate grade concentrate of Madhya Pradesh region in India and a South African slag. The xenotime concentrate obtained from the former place was an intermediate grade (47%) rare earth phosphate containing both monazite and xenotime. The South African slag was a low-grade waste product typically containing only 4% of rare earths. The rare earth resource concentrates have been treated individually by different methods such as alkali fusion and alkali leaching to convert them into their mixed oxides. Both types of materials have been processed and greater than 98% solubilization of metal values has been achieved in the intermediate grade xenotime and 80% from the South African slag. The residue of xenotime hydroxide has been washed thoroughly to collect the sodium phosphate, as by-product and the slurry pH have been adjusted to separate rare earths from thorium effectively. Other impurities such as uranium and iron have been removed by precipitation of rare earths by oxalic acid. It has been possible to recover >95% yttrium along with other rare earth oxides.

  15. 珍稀濒危植物海南粗榧种群遗传多样性研究%Genetic Diversity of Cephalotaxus mannii,a Rare and Endangred Plant

    Institute of Scientific and Technical Information of China (English)

    杜道林; 苏洁; 付永川; 周鹏; 马文儒; 向志强

    2002-01-01

    Using RAPD technique, the DNA diversity of Cephalotaxus mannii Hook. f., its genetic diversity pattern, the reasons for its endangered position and conservative approaches were studied. The results show that: 1. The genetic diversity of C. mannii collected from five localities in Hainan is low, and its adaptability to environmental change is weak. 2. The differences of genetic diversity between intra- and inter-populations are great, and the major variation distributes within the population (DNA diversity is 85.1%). 3. The excessive lumbering, man-made destruction, violent typhoon, edible value of the seeds and genetic drift were the main reasons for the low-level genetic diversity of C. mannii and its endangered position. 4. The difference of the micro-environment and other random factors affecting the population should also be taken into full consideration in the study and in protection of such occasionally scattered plants. 5. Enforced measures should be taken to protect the present population, enlarge the population and lower the loss rate of its gene. Mt. Limulin should be chosen as a conservative spot because of its high genetic diversity and less destruction of the forest. Meanwhile, the protection of other populations should be enforced. 6. The differences within and between the populations are great based on different primers used. The change of proportions in polymorphic loci between the populations is more than that between the primers.%利用RAPD技术对珍稀濒危植物海南粗榧(Cephalotaxus mannii Hook . f.)遗传多样性水平、分布、濒危原因及物种保护等问题进行了探讨.结果表明:1. 海南粗榧在海南岛的5个取样地点表现出低水平的遗传多样性,对环境变化的适应能力不强; 2. 海南粗榧种群内和种群间的遗传多样性所占比例有很大差异,绝大部分变异分布于种群内(DNA多样性为85.1%);种群间仅有较低程度的分化;3. 人为砍伐、植被破坏、台风、被食

  16. China rare earth market review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Rare earth market remained stagnant recently. The buyers did not show willingness to replenish raw materials affected by weak demand. Most persons in rare earth circle were not confident with the short-term rare earth market. Demand for didymium mischmetal was soft recently. The market of dysprosium related products was quiet and NdFeB magnet producers were inactive in the purchase. Phosphor market was stagnant as well. Buyers were cautious on replenishing the material. There were few inquiries for europium oxide (99.9%) in spot market and transactions were difficult.

  17. Organizational Learning in Rare Events

    DEFF Research Database (Denmark)

    Vaarst Andersen, Kristina; Beukel, Karin; Tyler, Beverly B.

    When organizations encounter rare events they often find it challenging to extract learning from the experience. We analyze opportunities for organizational learning in one such rare event, namely Intellectual Property (IP) litigation, i.e., when organizations take disputes regarding...... their intellectual property to court. We propose, that organizations can learn to litigate, although it is a rare event, by applying mechanisms in a current litigation case that have been successful in previous litigation cases. However, we also posit, that the usefulness of these learning mechanisms for a current...

  18. Sigmoid schwannoma: A rare case

    Institute of Scientific and Technical Information of China (English)

    Constantine I. Fotiadis; Ilias A. Kouerinis; Ioannis Papandreou; George C. Zografos; George Agapitos

    2005-01-01

    Schwannomas are rare tumors derived from the cells of Schwann that form the neural sheath. When located in the gastrointestinal tract, they constitute together with leiomyoma, leiomyoblastoma, and leiomyosarcoma, the gastrointestinal stromal tumors (GIST). Peripheral nerve sheath tumors represent 2-6% GIST with most common location, the stomach and the small intestine. Schwannomas of the colon and rectum are extremely rare and radical excision with wide margins is mandatory, due to their tendency to recur locally and become malignant, if left untreated. In the present study, we report a rare case of a sigmoid schwannoma, which was successfully treated in our department and reviewed the literature.

  19. Organizational Learning in Rare Events

    DEFF Research Database (Denmark)

    Vaarst Andersen, Kristina; Beukel, Karin; Tyler, Beverly B.

    their intellectual property to court. We propose, that organizations can learn to litigate, although it is a rare event, by applying mechanisms in a current litigation case that have been successful in previous litigation cases. However, we also posit, that the usefulness of these learning mechanisms for a current......When organizations encounter rare events they often find it challenging to extract learning from the experience. We analyze opportunities for organizational learning in one such rare event, namely Intellectual Property (IP) litigation, i.e., when organizations take disputes regarding...... to litigate, although litigation is a relatively rare event, if they leverage what they have learned from previously successful litigations. However, learning is less likely to be applicable to contract cases than it will be in infringement cases....

  20. China Rare Earth Holdings Limited

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    China Rare Earth Holdings Limited is a large trans-area corporation and a public company listed in Hong Kong Stock Exchange (Name: China Rare Earth, Code: 0769), with headquarter in Hong Kong. Located on the bank of beautiful Taihu Lake, the subsidiary in Yinxing covers area of 200,000 m2. It has nearly 1,000 employees, 30% of whom are technical staffs. After self-administration and effort, the company passed ISO 9001: 2000 and ISO 14000 Certificaitons.

  1. Rare Gas Halide (RGH) Kinetics.

    Science.gov (United States)

    1988-02-01

    high-energy electron distributions have been made by Elliot and Green8 , and Bretagne , et al., but these calculations were limited to pure rare gases of...model development begins by using the same basic calculation ’ ’ procedure as presented by Bretagne , et al. 9 The distribution of electron energy is...and Bretagne , et al. have proposed empirical formulas for M-shell ionization of argon gas. For other rare gases, the formulas given by Green " and

  2. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Rare earth market remained depressed after the New Year affected by the weak demand. Purchaser preferred to consume inventories rather than increase the stockpile. There was a strong wait-and-see atmosphere in the market. Driven by the intense desire to sell out the commodities, traders further decreased their quoted price for rare earth products. Most persons in the market preferred to hold commodities and waited for a rise in the market after the Spring Festival.

  3. China Rare Earth Market Review

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    November 20-30.2011 Weak demand resulted in the slack rare market. Consumers did not intend to rep earth enish inventories yet and transactions of rare earth products were stagnant. The market of didymium-related products was in the doldrums. Demand for dysprosium-related products was sluggish. Inquiries for europium oxide (99.9%) were few and dealings of the product were difficult.

  4. [Adult-onset rare diseases].

    Science.gov (United States)

    Pfliegler, György; Kovács, Erzsébet; Kovács, György; Urbán, Krisztián; Nagy, Valéria; Brúgós, Boglárka

    2014-03-01

    The present paper is focusing on rare diseases manifesting in late childhood or adulthood. A part of these syndromes are not of genetic origin, such as relatively or absolutely rare infections, autoimmune diseases, tumours, or diseases due to rare environmental toxic agents. In addition, even a large proportion of genetic disorders may develop in adulthood or may have adult forms as well, affecting are almost each medical specialization. Examples are storage disorders (e.g. adult form of Tay-Sachs disease, Gaucher-disease), enzyme deficiencies (e.g. ornithin-transcarbamylase deficiency of the urea cycle disorders), rare thrombophilias (e.g. homozygous factor V. Leiden mutation, antithrombin deficiency), or some rare monogenic disorders such as Huntington-chorea and many others. It is now generally accepted that at least half of the 6-8000 "rare diseases" belong either to the scope of adult-care (e.g. internal medicine, neurology), or to "age-neutral" specialities such as ophtalmology, dermatology etc.).

  5. RARE DISEASES AND GENETIC DISCRIMINATION

    Directory of Open Access Journals (Sweden)

    Mariela Yaneva – Deliverska

    2011-04-01

    Full Text Available Rare diseases are characterised by their low prevalence (less than 1/2,000 and their heterogeneity. They affect both children and adults anywhere in the world. From the medical perspective, rare diseases are characterised by the large number and broad diversity of disorders and symptoms that vary not only from disease to disease, but also within the same disease.Main characteristics of rare diseases include:· Rare diseases are often chronic, progressive, degenerative, and often life-threatening· Rare diseases are disabling: the quality of life of patients is often compromised by the lack or loss of autonomy· High level of pain and suffering for the patient and his/ her family · No existing effective cure· There are between 6000 and 8000 rare diseases· 75% of rare diseases affect children· 30% of rare disease patients die before the age of 5· 80% of rare diseases have identified genetic origins. Other rare diseases are the result of infections (bacterial or viral, allergies and environmental causes, or are degenerative and proliferative.Beyond the diversity of the diseases, rare disease patients and their families are confronted with the same wide range of difficulties arising directly from the rarity of these pathologies. The period between the emergence of the first symptoms and the appropriate diagnosis involves unacceptable and highly risky delays, as well as wrong diagnosis leading to inaccurate treatments. Living with a rare disease has implications in all areas of life, whether school, choice of future work, leisure time with friends, or affective life. It may lead to stigmatisation, isolation, exclusion from social community, discrimination for insurance subscription (health insurance, travel insurance, mortgage, and often reduced professional opportunities.Innovative treatments are often unevenly available in the EU because of delays in price determination and/or reimbursement decision, lack of experience of the treating

  6. Magnetic Partitioning Nanofluid for Rare Earth Extraction from Geothermal Fluids

    Energy Technology Data Exchange (ETDEWEB)

    McGrail, Bernard P. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Thallapally, Praveen K. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Liu, Jian [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Nune, Satish K. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2017-08-21

    Rare earth metals are critical materials in a wide variety of applications in generating and storing renewable energy and in designing more energy efficient devices. Extracting rare earth metals from geothermal brines is a very challenging problem due to the low concentrations of these elements and engineering challenges with traditional chemical separations methods involving packed sorbent beds or membranes that would impede large volumetric flow rates of geothermal fluids transitioning through the plant. We are demonstrating a simple and highly cost-effective nanofluid-based method for extracting rare earth metals from geothermal brines. Core-shell composite nanoparticles are produced that contain a magnetic iron oxide core surrounded by a shell made of silica or metal-organic framework (MOF) sorbent functionalized with chelating ligands selective for the rare earth elements. By introducing the nanoparticles at low concentration (≈0.05 wt%) into the geothermal brine after it passes through the plant heat exchanger, the brine is exposed to a very high concentration of chelating sites on the nanoparticles without need to pass through a large and costly traditional packed bed or membrane system where pressure drop and parasitic pumping power losses are significant issues. Instead, after a short residence time flowing with the brine, the particles are effectively separated out with an electromagnet and standard extraction methods are then applied to strip the rare earth metals from the nanoparticles, which are then recycled back to the geothermal plant. Recovery efficiency for the rare earths at ppm level has now been measured for both silica and MOF sorbents functionalized with a variety of chelating ligands. A detailed preliminary techno-economic performance analysis of extraction systems using both sorbents showed potential to generate a promising internal rate of return (IRR) up to 20%.

  7. Bayesian analysis of rare events

    Energy Technology Data Exchange (ETDEWEB)

    Straub, Daniel, E-mail: straub@tum.de; Papaioannou, Iason; Betz, Wolfgang

    2016-06-01

    In many areas of engineering and science there is an interest in predicting the probability of rare events, in particular in applications related to safety and security. Increasingly, such predictions are made through computer models of physical systems in an uncertainty quantification framework. Additionally, with advances in IT, monitoring and sensor technology, an increasing amount of data on the performance of the systems is collected. This data can be used to reduce uncertainty, improve the probability estimates and consequently enhance the management of rare events and associated risks. Bayesian analysis is the ideal method to include the data into the probabilistic model. It ensures a consistent probabilistic treatment of uncertainty, which is central in the prediction of rare events, where extrapolation from the domain of observation is common. We present a framework for performing Bayesian updating of rare event probabilities, termed BUS. It is based on a reinterpretation of the classical rejection-sampling approach to Bayesian analysis, which enables the use of established methods for estimating probabilities of rare events. By drawing upon these methods, the framework makes use of their computational efficiency. These methods include the First-Order Reliability Method (FORM), tailored importance sampling (IS) methods and Subset Simulation (SuS). In this contribution, we briefly review these methods in the context of the BUS framework and investigate their applicability to Bayesian analysis of rare events in different settings. We find that, for some applications, FORM can be highly efficient and is surprisingly accurate, enabling Bayesian analysis of rare events with just a few model evaluations. In a general setting, BUS implemented through IS and SuS is more robust and flexible.

  8. A Rare Presentation of a Rare Disease: Pulmonary Lymphomatoid Granulomatosis

    Directory of Open Access Journals (Sweden)

    Ghulam Rehman Mohyuddin

    2012-01-01

    Full Text Available A 70-year-old female presented with a 4-week history of dry cough and wheezing. Chest radiograph showed a 10.5 cm mass-like density in the anterior mediastinum which had not been previously visualized. Computed tomography scan (CT of the chest showed a right hilar mass encasing and narrowing right upper lobe bronchus and right mainstem bronchus and secondary atelectatic changes. Biopsy was consistent with a diagnosis of lymphomatoid granulomatosis Grade 3. She responded well clinically and radiologically to therapy. Lymphomatoid granulomatosis is a rare EBV-associated disorder which is considered a lymphoproliferative disease. The most common radiographic feature is multiple lung nodules. An isolated hilar mass is an exceptionally rare presentation of this rare disease.

  9. 南方稀土采矿恢复地土壤稀土元素含量及植物吸收特征%Concentrations of soil rare earth elements and their accumulation characteristics in plants in recovered mining wastelands in Fujian Province, South China

    Institute of Scientific and Technical Information of China (English)

    李小飞; 陈志彪; 陈志强

    2013-01-01

    通过野外取样调查和室内ICP-MS测定,研究了福建省长汀县稀土矿治理地土壤和主要植物中稀土元素的含量、分布以及转移特征.结果表明:稀土矿治理地的土壤养分含量较低;土壤中稀土元素的含量为507.40~841.37 mg· kg-1,高于对照地土壤的含量.稀土矿治理地土壤中稀土元素主要为交换态,其含量占总量的61%~98%.稀土矿治理地土壤中稀土元素从原来偏单一的交换态转变为多种形态共存,其中有机态含量显著升高.植物根、茎、叶中稀土元素含量分别为40.27~986.01、5.14 ~ 206.58、6.81 ~ 2364.51mg·kg-1.稀土元素在植物各器官中含量水平除芒萁为叶>根>茎,其他植物均表现为根>叶>茎.根据不同植物吸收和积累稀土元素的差异,可将矿区治理地植物分为富集型和根部囤积型植物.芒萁属于富集型植物,桉树、高羊茅、宽叶雀稗、木荷和油茶属于根部囤积型植物.%Based on filed sampling and laboratory analysis,this paper studied the concentration,distribution,and migration of rare earth elements (REEs) in the soils and dominant plants in recovered mining wastelands in Changing County of Fujian Province.Due to the serious destruction of the soils,their nutrient contents were lower,but the REEs concentrations ranged from 507.40 to 841.37 mg · kg-1,being higher than those of the control.The REEs in the soils were mainly in exchangeable form,accounting for 61%-98% of total.The soil REEs were transformed from single exchangeable form to a variety of fractions,and the concentration of organic fractions increased significantly.The REEs concentrations in plant root,stem,and leaf were 40.27-986.01,5.14-206.58,and 6.81-2364.51 mg · kg-1,respectively.Except that the REEs concentrations in Dicranopteris pedata organs were in the order of leaf > stem > root,those in the other plants organs were in the order of root > leaf > stem.According to the

  10. A rare metastasis from a rare brain tumour

    DEFF Research Database (Denmark)

    Aabenhus, Kristine; Hahn, Christoffer Holst

    2014-01-01

    This case report presents the story of a patient with an oligodendroglioma metastasizing to the bone marrow and to lymph nodes of the neck. The patient had undergone primary brain surgery 13 years prior to the discovery of metastases and radiotherapy directed at the brain tumour two months prior........ Oligodendroglioma are rare primary brain tumours of which extraneural metastasis is even more rare. The incidence of cases like this may be increasing because of better treatment and thus longer survival of patients with oligodendroglioma....

  11. 包钢选矿厂含钍粉尘作业工人外周血淋巴细胞适应性反应的研究%Adaptive responses on chromosome aberration and DNA breakage of peripheral lymphocytes from workers exposed to thorium and rare earth mixed dust in Baotou Steel Plant

    Institute of Scientific and Technical Information of China (English)

    刘青杰; 封江彬; 陆雪; 陈德清; 刘玉飞; 贾柯君; 吕慧敏; 苏旭

    2008-01-01

    Objective To explore if the occupational exposure to low dose thorium could induce adaptive response in peripheral lymphocytes.Methods 40 individuals.who exposed to thorium and rare earth mixed dust(exposure group) or control in Baotou Steel Plant, were selected, and chromosome aberrations were analyzed.Then the peripheral blood samples were irradiated in vitro with 2 Gy60Co γ-rays,and unstable chromosome aberration or DNA stand breakage analysis using single cell gel electrophoresis was performed. Results The dicentrics before 2 Gy exposure in exposure group was higher than that in control(P>0.05). But the dicentries after 2 Gy exposure in exposure group was lower than that in control,but not significantly (P>0.05).The tricentrics in exposure group was significantly lower than that in control(U=3.1622, 0.0ol0.05),三着丝粒畸变在两组间差异具有统计学意义(u=3.1622,0.001

  12. RARE AND PROTECTED SPECIES IN URBAN FLORA OF GENICHESK

    Directory of Open Access Journals (Sweden)

    Maltseva S. Yu.

    2015-04-01

    Full Text Available Urbanization is one of the most characteristic features of scientific and technological progress, which is associated with the rapid growth of cities and the urban population. It leads to irreversible processes of transformation of the natural environment. It anthropogenic transformation in connection with the development of the city and the subsequent rapid urbanization deals a devastating blow to the remnants of natural fractions urbanflora, which is preserved in the vicinity of Genichesk and would threaten the survival of a number of rare species of plants that grow here only in small areas with a small number of individuals. The article studies the protected and rare species of plants growing in the urban environment Genichesk. The study was conducted by routing way, with the implementation of standard procedures for drying, installation and post-processing of herbarium specimens. The research resulted in found new habitats of species listed in the Red Book, such as Astragalus borysthenicus Klokov, Crambe maritima L., Tulipa gesneriana L., Astrodaucus littoralis (M. Bieb. Drude, Stipa ucrainica P. Smirn., Tamarix gracillis Willd. Also in the article provides a brief description of 11 species of vascular plants and their sozological value. Saving the plants, which listed in the Red Book of Ukraine, in the city Genichesk, is a difficult task. The main limiting factors are destruction of habitat, degradation of soil cover. As a result of anthropogenic activities, cultivation, creation of pastures and destruction of natural habitats are declining habitat and abundance of rare and endemic species. Collect flowers for bouquets also reduces the number of rare species. Every year in the spring on the outskirts of the city lit dry grass, which adversely affects the early-flowering plants, including rare, such as Tulipa gesneriana L., Adonis vernalis L., Convallia majalis L. Despite this, a significant number of these plants not only grows urboecotope

  13. Effects of rare-earth elements La3+and Ce3+ on the growth of Rabdosia rubescens regeneration plant and the accumulation of main secondary metabolites%稀土元素镧和铈对冬凌草再生植株生长及次生代谢产物的影响

    Institute of Scientific and Technical Information of China (English)

    董诚明; 曹利华; 苏秀红; 张艳贞; 乔毅琳; 姚锋

    2015-01-01

    以冬凌草无菌苗为材料,在冬凌草再生植株时期,添加不同浓度的稀土元素镧和铈,用重量法测定其单株平均鲜重及干重,用高效液相法测定冬凌草甲素、乙素、迷迭香酸的含量,参考农作物、园艺作物种质评比的方法,根据冬凌草生产中各项指标的重要性,设置权重,计算加权后得到综合评分对其进行综合评价,探讨稀土元素镧、铈对冬凌草再生植株产量及次生代谢产物冬凌草甲素、乙素、迷迭香酸含量的影响.结果表明:空白对照组综合评分为62.99分,添加稀土元素铈的条件下,1μmol·L-1 CeCl3·7 H 2 O 评分最高为87.96分,添加稀土元素镧的条件下,5μmol·L-1 LaCl3·6 H 2 O 评分最高为74.44分,这表明 CeCl3·7 H 2 O 对冬凌草再生植株生长及次生代谢产物积累的促进作用优于 LaCl3·6 H 2 O;适宜浓度的镧、铈能促进冬凌草再生植株的生长及次生代谢产物冬凌草甲素、冬凌草乙素、迷迭香酸的合成,而高浓度10μmol·L-1 LaCl3·6 H 2 O 具有抑制的情况.该研究结果将对进一步研究稀土元素对冬凌草再生植株生长的促进作用机制奠定基础,为植物组织培养中如何科学合理地使用稀土元素提供理论依据.%Aseptic seedlings of Rabdosia rubescens were used as the experiment material.In R .rubescens regeneration period,the rare-earth elements La3+ or Ce3+ with different concentrations were added in the culture medium.Fresh and dry weight of the plant were determined by gravimetric method.HPLC method was used for the determination of oridonin,ponicidin and rosmarinic acid content.We determined weight according to evaluating methods of agricultural and horticultural crops and the importance of indexes in the production of R .rubescens .The quality synthetic evalua-tion was also carried out according to weighted mark.The effects of rare earth elements La3+ and Ce3+ on R .rubescens tissue culture and the contents of

  14. Rare Earth Separation in China

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    During the last decade, China rare earth (RE) industry has made significant progress and become one of the most important producers in the world. In this paper, the recent developments in both fundamental research and industrial application are briefly reviewed: (1) the development and application of Theory of Countercurrent Extraction, (2) the novel solvent extraction process and its application in industry for separating heavy rare earth elements (Tm, Yb, Lu), yttrium (Y), and scandium (Sc), (3) the on-line analysis and automatic control of countercurrent extraction, (4) the eco-friendly process for RE/Th separation of bastnasite in Sichuan Province and electrochemical process for Eu/RE separation, and (5) the optimized flowcharts for typical rare earth minerals in China.

  15. Ainhum - A Rare Case Report

    Science.gov (United States)

    Prabhu, Ravi; Vinoth, Sundaresan; Praveen, Chinnappan Balasubramanian

    2016-01-01

    The term ‘AINHUM’ is derived from the African word meaning ‘to saw or cut’. True ainhum otherwise called dactylolysis spontanea is a condition involving soft tissue or digits with constricting rings commonly presenting in fifth toes, usually bilateral. It is to be differentiated from Pseudo-ainhum that occurs secondary to some hereditary and nonhereditary diseases that lead to annular constriction of digits. We report a rare case of true ainhum involving the left fourth toe only. It is a very rare case and a very few were reported worldwide. The highest incidence of ainhum has been reported in South Africa and South America. It is rarely reported in India. Ainhum when diagnosed and treated in early stages can be prevented from progressing to mutilating deformities. PMID:27190888

  16. Rare and Endangered Geophyte Plant Species in Serpentine of Kosovo

    OpenAIRE

    Naim Berisha; Fadil Millaku; Elez Krasniqi; Bekim Gashi

    2014-01-01

    Our study documents information on rarity, geographical distribution, taxonomy and conservation status of 11 geophyte species in serpentine soils of Kosovo, already included in the Red Book of Vascular Flora of Kosovo. Kosovo’s serpentine vegetation represents a diversity that yet has not been sufficiently explored. Large serpentine complexes are found in the northern Kosovo but also southern part of the country is rich in serpentines, therefore in endemics. Serpentine rocks and soils are cha...

  17. Choctaw National Wildlife Refuge Natural Community and Rare Plant Survey

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Choctaw National Wildlife Refuge (CNWR) administers approximately 4,218 acres along theTombigbee River in Choctaw County, Alabama (Figure 1). The Refuge contains a...

  18. Rare Plants - City of San Diego [ds455

    Data.gov (United States)

    California Department of Resources — The Biological Monitoring Plan (BMP; Ogden 1996) for the Multiple Species Conservation Program (MSCP) was developed in 1996 and is a component of the City of San...

  19. Zebra: searching for rare diseases

    DEFF Research Database (Denmark)

    2012-01-01

    disease diagnostic hypotheses in the domain of medical IR. In this work, we build upon an existing vertical medical search engine, Zebra, that is focused on rare disease diagnosis. In previous work, Zebra has been evaluated using real-life medical cases of rare and difficult diseases, and has been found...... to be a useful and competitive tool for clinicians. In this work, we extend Zebra’s functionalities to optimise the task of medical diagnosis through search as follows: we add the option of grouping retrieved documents into clusters based on disease name occurrence, and we offer a ‘disease-ranking’ option...

  20. Dioctophymiasis: A Rare Case Report.

    Science.gov (United States)

    Chauhan, Sapna; Kaval, Sunil; Tewari, Swati

    2016-02-01

    Dioctophyma renale commonly known as "giant kidney worm' is found in the kidney of carnivorous mammals. Human infestation is rare, but results in destruction of the kidneys. Very few cases have been reported worldwide. We are here reporting a case of Dioctophymiasis in a 35-year-old male patient who presented with retention of urine and subsequent passage of worm and blood in urine. The worm was confirmed as Dioctophyma renale based on its morphology and clinical presentation. This is a very rare case report and to best of our knowledge only two cases have been reported from India.

  1. Rare B decays at CDF

    Energy Technology Data Exchange (ETDEWEB)

    Farrington, Sinead M.; /Liverpool U.

    2006-10-01

    The confidence level limits of the CDF search for the B{sub s}{sup 0} and B{sub d}{sup 0} {yields} {mu}{sup +}{mu}{sup -} rare decays and the branching ratio measurement of B{sub s}{sup 0} {yields} D{sub s}{sup +} D{sub s}{sup -} are presented.

  2. Rare diseases and orphan drugs

    Directory of Open Access Journals (Sweden)

    Domenica Taruscio

    2011-01-01

    Full Text Available According to the Regulation (EC N. 141/2000 of the European Parliament and of the Council, rare diseases are life-threatening or chronically debilitating conditions, affecting no more than 5 in 10 000 persons in the European Community. It is estimated that between 6000 to 8000 distinct rare diseases affect up to 6% of the total EU population. Therefore, these conditions can be considered rare if taken individually but they affect a significant proportion of the European population when considered as a single group. Several initiatives have been undertaken at international, European and national level to tackle public health as well as research issues related to the prevention, diagnosis, treatment and surveillance of these diseases. The development of innovative and effective medical products for their diagnosis and treatment is frequently hampered by several factors, including the limited knowledge of their natural history, the difficulties in setting up clinical studies due to the limited numbers of patients affected by a specific disease, the weak interest of sponsors due to the restricted market opportunities. Therefore, incentives and other facilitations have been adopted in many parts of the world, including in the EU, in order to facilitate the development and commercialization of diagnostic tools and treatments devoted to rare diseases. This paper illustrates mainly the European initiatives and will discuss the problematic and controversial aspects surrounding orphan drugs. Finally, activities and measures adopted in Italy are presented.

  3. Rare red blood cell abnormalities

    NARCIS (Netherlands)

    van Zwieten, R.

    2015-01-01

    The aim of this thesis is to give insight in the process of diagnosing rare red blood cell defects, to clarify the relation of a defect with cell function and to extend, in this respect, our knowledge about normal red cell function and biochemistry. It is possible to categorize different red cell ab

  4. Rare decays of b hadrons

    CERN Document Server

    Koppenburg, Patrick; Smizanska, Maria

    2016-01-01

    Rare decays of b hadrons provide a powerful way of identifying contributions from physics beyond the Standard Model, in particular from new hypothetical particles too heavy to be produced at colliders. The most relevant experimental measurements are reviewed and possible interpretations are briefly discussed.

  5. Genetic analysis of rare disorders

    DEFF Research Database (Denmark)

    van den Berg, Stéphanie M; von Bornemann Hjelmborg, Jacob

    2012-01-01

    Twin concordance rates provide insight into the possibility of a genetic background for a disease. These concordance rates are usually estimated within a frequentistic framework. Here we take a Bayesian approach. For rare diseases, estimation methods based on asymptotic theory cannot be applied due...

  6. Metacomprehension during Rare Word Comprehension

    Science.gov (United States)

    Mcginnis, Debra; Saunders, Nikola N.; Burns, Ryan J.

    2007-01-01

    To examine metacomprehension during comprehension, undergraduates (n = 133) were asked to provide descriptions of how they determined the meaning of four rare words presented in short passages. Content analysis of these written descriptions revealed task-specific metacomprehension reflecting lexical, textbase, and situation model processes.…

  7. Spinal actinomycosis: A rare disease

    Directory of Open Access Journals (Sweden)

    Dua Rakesh

    2010-01-01

    Full Text Available Actinomycosis is an indolent, slowly progressive infection caused by Actinomyces species. Of human actinomycosis, the spinal form is rare and actinomycosis-related spinal neurological deficit is uncommon. We report two cases with cervical and dorsal actinomycosis and one of them with spinal neurological deficit.

  8. Rare presentation of biliary ascariasis.

    Science.gov (United States)

    Rather, Ajaz; Salati, Sajad Ahmad

    2010-09-01

    Ascariasis is the most common helminthic infection in the world. We present a very rare manifestation of ascariasis in which the worms came out through the T-tube tract of a 36 years old patient who had undergone cholecystectomy with choledocholithotomy.

  9. Cardiofaciocutaneous syndrome: A rare entity

    Directory of Open Access Journals (Sweden)

    S Pavithra

    2012-01-01

    Full Text Available The cardiofaciocutaneous (CFC syndrome is a condition of sporadic occurrence, with patients showing multiple congenital anomalies and mental retardation and characteristic dysmorphic features. We, thus, report a rare case of this syndrome in a 1-year-old child who presented with typical features of CFC syndrome.

  10. Rare cause of subcutaneous emphysema

    Energy Technology Data Exchange (ETDEWEB)

    Prober, A.; Tverskoy, M.

    1986-12-01

    A rare cause of subcutaneous emphysema is described which developed in two patients after epidural anaesthesia. Only two case reports could be found in literature describing similar conditions. The anaesthesia is performed using the 'loss of resistance' technique with injection of air for the identification of the epidural space. Possible explanations for the development of the emphysema are discussed.

  11. Plant Distribution and Habitat, Non-Agriculture, Layer identifies sites (terrestrial or aquatic) that are of especial biodiversity significance. A site's significance may be due to the presence of rare species, rare or high quality natural communities, or other important ecological features., Published in 1995, 1:12000 (1in=1000ft) scale, NC DENR / Office of Conservation, Planning, and Community Affairs / Natural Heritage Program.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Plant Distribution and Habitat, Non-Agriculture dataset, published at 1:12000 (1in=1000ft) scale, was produced all or in part from Field Observation information...

  12. Teeth in Rare Locations with Rare Complications: An Overview

    OpenAIRE

    Dhingra, Shruti; Gulati, Achal

    2015-01-01

    Ectopic presence of teeth within the dentate region is common in clinical practice. However, the presence of teeth in non-dentate areas such as the nasal cavity or the maxillary sinus is rare. These may remain asymptomatic for years, may be misdiagnosed as foreign bodies, or may present with some serious complications involving the nose and paranasal sinuses. Complications such as nasal obstruction, epistaxis, headaches, rhinolith formation, epiphora, sinusitis and oro-antral fistula have bee...

  13. Development Trend of Rare Earth Standardion Work

    Institute of Scientific and Technical Information of China (English)

    Ma Jie; Lin Jirong; Zhao Fei; Zhang Xiuyan

    2004-01-01

    Rare earth standardization was developed along with rare earth industry.In recent decades, great advances have been made in China rare earth industry.This paper describes the status of rare earth standardization, problems existed and ways to perfect.Now the number of Chinese Rare Earth Standards has increased to 232 with expanding of the categories and covering scope of rare earth products.But the present standard system cannot be completely suited with rare earth production and trade, and not keep pace with the advance of technology.Standards are important rules in world trade and must be acted on.

  14. Tensions on rare metals; Tensions sur les metaux rares

    Energy Technology Data Exchange (ETDEWEB)

    Rigaud, Ch.

    2010-06-15

    Rare earths that are used in the high or green technologies are facing short term shortages due to the steadily increasing demand and to the fact that some countries are reluctant to export them. For instance neodymium is used to make permanent magnets for the new generation of wind turbines. A year ago the price of neodymium was 14 dollar a kg while today it is priced at 40 dollar a kg, its production stagnates at 24000 tonnes a year which is just enough to meet the demand. The fear of shortage is high for thin layers in which tellurium, indium and germanium are involved. It is possible to act at any level of the production chain: to optimize the industrial production processes, to reduce the thickness of the thin layers, to recycle discarded equipment, to propose alternative solution: for instance the kesterite ore is studied in view of replacing indium in photovoltaic applications. The issue of rare earths or other rare metals begins to appear on government agenda. (A.C.)

  15. [Care for patients with rare diseases].

    Science.gov (United States)

    Smetsers, Stephanie E; Takkenberg, J J M Hanneke; Bierings, Marc B

    2014-01-01

    A rare disease usually concerns only a handful of patients, but all patients with a rare disease combined represent a significant health burden. Due to limited knowledge and the absence of treatment guidelines, patients with rare diseases usually experience delayed diagnosis and suboptimal treatment. Historically, rare diseases have never been considered a major health problem. However, rare diseases have recently been receiving increased attention. In the Netherlands, a national plan for rare diseases was published in late 2013, with recommendations on how to improve the organisation of healthcare for people with rare diseases. Using the example of the rare disease Fanconi anemia, this paper describes the challenges and opportunities in organising healthcare for rare diseases. Two critical steps in optimising healthcare for rare diseases are developing multidisciplinary healthcare teams and stimulating patient empowerment. Optimal cooperation between patients, patient organisations, multidisciplinary healthcare teams and scientists is of great importance. In this respect, transition to adult healthcare requires special attention.

  16. Neonatal hemophilia: a rare presentation

    Directory of Open Access Journals (Sweden)

    Nuno Ferreira

    2015-12-01

    Full Text Available Hemophilia A is a X-linked hereditary condition that lead to decreased factor VIII activity, occurs mainly in males. Decreased factor VIII activity leads to increased risk of bleeding events. During neonatal period, diagnosis is made after post-partum bleeding complication or unexpected bleeding after medical procedures. Subgaleal hemorrhage during neonatal period is a rare, severe extracranial bleeding with high mortality and usually related to traumatic labor or coagulation disorders. Subgaleal hemorrhage complications result from massive bleeding. We present a neonate with unremarkable family history and uneventful pregnancy with a vaginal delivery with no instrumentation, presenting with severe subgaleal bleeding at 52 hours of life. Aggressive support measures were implemented and bleeding managed. The unexpected bleeding lead to a coagulation study and the diagnosis of severe hemophilia A. There were no known sequelae. This case shows a rare hemophilia presentation reflecting the importance of coagulation studies when faced with unexplained severe bleeding.

  17. Chondroectodermal dysplasia: a rare syndrome.

    Directory of Open Access Journals (Sweden)

    Dana Tahririan

    2014-06-01

    Full Text Available Chondroectodermal dysplasia (Ellis-Van Creveld syndrome is a rare autosomal recessive congenital abnormality. This syndrome is characterized by a spectrum of clinical findings, among which chondrodystrophy, polydactyly, ectodermal dysplasia, and congenital cardiac anomalies are the most common. It is imperative to not overlook the cardiac complications in patients with this syndrome during dental procedures. The case presented here, although quite rare, was detected under normal conditions and can be alarming for dental care providers. Clinical reports outline the classical and unusual oral and dental manifestations, which help health care providers diagnose chondroectodermal dysplasia, and refer patients with this syndrome to appropriate health care professionals to receive treatment to prevent further cardiac complications and bone deformities.

  18. Diphtheria rare localization in adults

    Directory of Open Access Journals (Sweden)

    Yu. I. Liashenko

    2011-01-01

    Full Text Available Last 25 years in the country established sporadic diphtheria morbidity (less than 0.1 per 100 000 people. In this situation, the attention of medical specialists pre-hospital and hospital health care system is reduced, especially for diseases with a rare localization of pathological process. Mentioned circumstances contribute to delayed diagnosis and treatment of his patients, the major cause of complicated infection, often its unfavorable outcome and a factor of the epidemic of trouble for the infection. The authors present material evidence that the rare forms of diphtheria in the period of sporadic disease in much the same as in the epidemic, and describe the clinical manifestations and course of diphtheria of the nose, eyes, throat, genitals, mouth and gastrointestinal tract in modern conditions.

  19. Testicular calculus: A rare case.

    Science.gov (United States)

    Sen, Volkan; Bozkurt, Ozan; Demır, Omer; Tuna, Burcin; Yorukoglu, Kutsal; Esen, Adil

    2015-01-01

    Testicular calculus is an extremely rare case with unknown etiology and pathogenesis. To our knowledge, here we report the third case of testicular calculus. A 31-year-old man was admitted to our clinic with painful solid mass in left testis. After diagnostic work-up for a possible testicular tumour, he underwent inguinal orchiectomy and histopathologic examination showed a testicular calculus. Case hypothesis: Solid testicular lesions in young adults generally correspond to testicular cancer. Differential diagnosis should be done carefully. Future implications: In young adults with painful and solid testicular mass with hyperechogenic appearance on scrotal ultrasonography, testicular calculus must be kept in mind in differential diagnosis. Further reports on this topic may let us do more clear recommendations about the etiology and treatment of this rare disease.

  20. Erythromelalgia: a rare microvascular disease.

    Science.gov (United States)

    Latessa, Victoria

    2010-06-01

    Erythromelalgia (EM) is a rare condition of unknown etiology that results in intense, burning pain and redness primarily of the feet, and, even more rarely, in the hands. Most cases are idiopathic (primary EM); others occur secondary to medical conditions, such as autoimmune diseases, and neurological or hematological disorders. Symptoms are episodic and can result in severe disability. Triggers, such as exposure to warmth, pressure or exercise, become apparent to those afflicted with this condition; however, triggers may be unavoidable during the course of daily living. There are no diagnostic tests for EM. Diagnosis is based on history, physical examination during symptomatic episode and the exclusion of other probable causes for the syndrome. Early recognition of the signs and symptoms as well as early treatment offer patients the best hope of remissions and improved quality of life.

  1. Rare decay searches at CDF

    CERN Document Server

    Maestro, Paolo

    2012-01-01

    In the last decade the CDF experiment at the Tevatron clearly demonstrated that it is possible to study extensively heavy flavour physics in hadron collisions and achieve remarkable results, competitive and complementary to $B$-factories. In this paper we report on the indirect searches for physics beyond the standard model via measurements of rare $b$-hadron decays. The final limits, based on the analysis of the full CDF data set, on the branching fraction of the $B^0_{(s)}$ decay into a pair of muons are presented and discussed. Moreover we review the latest measurements, with 6.8 fb$^{-1}$ of collected data, of the total and differential branching fractions and angular observables of rare $b$-hadron decays proceeding via the flavour-changing neutral-current process $b \\rightarrow s \\mu^+ \\mu^-$. PACS numbers: 13.20.He, 13.30.-a, 12.15.Mn

  2. Replica trick for rare samples

    Science.gov (United States)

    Rizzo, Tommaso

    2014-05-01

    In the context of disordered systems with quenched Hamiltonians I address the problem of characterizing rare samples where the thermal average of a specific observable has a value different from the typical one. These rare samples can be selected through a variation of the replica trick which amounts to replicating the system and dividing the replicas intwo two groups containing, respectively, M and -M replicas. Replicas in the first (second) group experience a positive (negative) small field O (1/M) conjugate to the observable considered and the M →∞ limit is to be taken in the end. Applications to the random-field Ising model and to the Sherrington-Kirkpatrick model are discussed.

  3. Rare Mycetes of Romania III

    Directory of Open Access Journals (Sweden)

    Denes PAZMANY

    1981-08-01

    Full Text Available New contributions to the knowledges concerning Romania's macromycetes are presented. The 208 species enlisted in the paper are grouped in classes and orders and within these groups the species are enlisted alphabetically. The data refers to species less known to Romania, collected in Transylvania, mostly around Cluj-Napoca. From these Daldinia vernicosa, Pleurotus calyptratus, Agaricus pseudopratensis, Armillariella bulbosa, Clitocybe harmajae and Tubaria hiemalis are rare in all Europe.

  4. Rare Earth Oxide Thin Films

    CERN Document Server

    Fanciulli, Marco

    2007-01-01

    Thin rare earth (RE) oxide films are emerging materials for microelectronic, nanoelectronic, and spintronic applications. The state-of-the-art of thin film deposition techniques as well as the structural, physical, chemical, and electrical properties of thin RE oxide films and of their interface with semiconducting substrates are discussed. The aim is to identify proper methodologies for the development of RE oxides thin films and to evaluate their effectiveness as innovative materials in different applications.

  5. Os Odontoideum: Rare Cervical Lesion

    Science.gov (United States)

    2011-11-01

    the articulation between C1 and the os odontoideum on flexion imaging. The remainder of his cervical vertebral bodies had normal alignment with no...appears normal. Figure 3. Flexion view of plain cervical spine. This image shows abnormal translation of the articulation between C1 and the C2 os...worldwide. Peer Reviewed Title: Os Odontoideum: Rare Cervical Lesion Journal Issue: Western Journal of Emergency Medicine, 12(4) Author: Robson

  6. Cutaneous actinomycosis: A rare case

    Directory of Open Access Journals (Sweden)

    Metgud S

    2007-01-01

    Full Text Available Cutaneous actinomycosis is a rare presentation. Here we present a case of cutaneous actinomycosis with no history of trauma or systemic dissemination. The isolate was identified as Actinomyces viscosus by standard methods. The isolate was found to be penicillin resistant by Kirby Bauer disc diffusion method. Therefore, the patient was treated with cotrimoxazole and improved. Thus, this case highlights the importance of isolation and susceptibility testing in actinomycotic infection. The sinuses have healed, and the patient has recovered.

  7. Os Odontoideum: Rare Cervical Lesion

    Directory of Open Access Journals (Sweden)

    Kristie A Robson

    2011-05-01

    Full Text Available We report the case of a 22-year-old Marine who presented to the emergency department, after a martial arts exercise, with transient weakness and numbness in all extremities. Computed tomography cervical spine radiographs revealed os odontoideum. Lateral flexion–extension radiographs identified atlanto-axillary instability. This abnormality is rare and can be career ending for military members who do not undergo surgical fusion. [West J Emerg Med. 2011;12(4:520–522.

  8. Rare Earths and Magnetic Refrigeration

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Magnetic refrigeration is a revolutionary, efficient, environmentally friendly cooling technology, which is on the threshold of commercialization. The magnetic rare earth materials are utilized as the magnetic refrigerants in most cooling devices, and for many cooling application the Nd2Fe14B permanent magnets are employed as the source of the magnetic field. The status of the near room temperature magnetic cooling was reviewed.

  9. Macrodystrophia lipomatosa: a rare presentation

    Directory of Open Access Journals (Sweden)

    Sushil G. Kachewar

    2011-07-01

    Full Text Available Macrodystrophia lipomatosa is a rare congenital nonhereditary mesenchymal hamartomatous malformation resulting in localized gigantism of parts of extremities that manifests clinically as macrodactyly or megalodactyly. Radiological and Pathological hallmark is the disproportionate fibroadipose tissue proliferation in subcutaneous tissue, nerve sheaths, and periosteum that leads to soft tissue and bony enlargement. As imaging is the key to early diagnosis, findings on various modalities like plain radiographs, CT scan and MRI are highlighted here.

  10. Rare locations of calcifying tendinitis

    Energy Technology Data Exchange (ETDEWEB)

    Nidecker, A.; Hartweg, H.

    1983-12-01

    5 case-reports illustrate 2 rare locations of calcifying peritendinitis: The insertion of the deltoid tendon in the proximal humreus and the insertion of the gluteus maximus tendon in the femur. Knowledge of these insertion sites on one hand and the possibility of calcifying tendinitis at these sites on the other hand may allow proper diagnosis of certain shoulder- and hip joint pain syndromes and subsequent correct therapy.

  11. TRAP SYNDROME: A RARE ENTITY

    OpenAIRE

    Varsha; Kanan; Chanda,, Abhra; Qazi,, S.

    2014-01-01

    TRAP (Twin Reversed Arterial Perfusion) sequence is a rare complication of monozygotic twin pregnancy. It is due to defect in early pregnancy where there is defective arterial anastomosis in placenta. This results in a fetus with an absent heart (acardiac twin). This acardiac twin has a poorly developed upper body and head also. The pump twin (with a normal heart) is also at a risk of heart failure and problems related to preterm birth1.

  12. TRAP SYNDROME: A RARE ENTITY

    Directory of Open Access Journals (Sweden)

    Varsha

    2014-04-01

    Full Text Available TRAP (Twin Reversed Arterial Perfusion sequence is a rare complication of monozygotic twin pregnancy. It is due to defect in early pregnancy where there is defective arterial anastomosis in placenta. This results in a fetus with an absent heart (acardiac twin. This acardiac twin has a poorly developed upper body and head also. The pump twin (with a normal heart is also at a risk of heart failure and problems related to preterm birth1.

  13. A rare presentation of hypothyroidism

    Directory of Open Access Journals (Sweden)

    Betsy Mathew

    2014-02-01

    Full Text Available In this case report, we have brought out a very rare presentation of hypothyroidism in the form of cataplexy and this case is of significance because there have been no similar case reports of hypothyroidism presenting as cataplexy so far. The other highlight of the case is that treatment of hypothyroidism alone resulted in complete freedom from cataplexy without the need for agrypnotic drugs. [Int J Res Med Sci 2014; 2(1.000: 328-329

  14. Rett syndrome: A rare case

    Directory of Open Access Journals (Sweden)

    Deepika Verma

    2016-01-01

    Full Text Available Rett syndrome (RTT is rare, affects predominantly female children. It presents as a pervasive developmental disorder with a remarkable behavioral phenotype. The discovery that mutation in methyl-C-phosphate-G-binding protein 2 causes RTT has focused attention to the importance of epigenetic modifications in neuronal function. We report a case of RTT in a 7-year-old female child and use of behavioral techniques and social skill training to control the behavioral symptoms.

  15. Rare beauty decays at LHCb

    CERN Document Server

    INSPIRE-00258140

    2015-01-01

    In this contribution we review the most recent measurements of the LHCb experiment in the field of rare decays of B mesons. In particular the first observation of the $B^0_s \\to µ^+ µ^-$,­ decay, the angular analysis of $B^0_d \\to K*l^+l^-$ decays and the test of lepton universality in $B^+ \\to K^+ l^+ l^-$ decays are presented.

  16. Collagenous Gastritis: A Rare Entity

    Directory of Open Access Journals (Sweden)

    Faten Limaiem

    2015-06-01

    Full Text Available Collagenous gastritis is a rare entity of unknown etiology characterized histologically by the presence of a thick subepithelial collagen band associated with an inflammatory infiltrate of gastric mucosa. A 40-year-old male presented with a history of chronic intermittent abdominal pain for about 6 months. Physical examination was unremarkable, and biological tests were within normal range. The patient underwent esophagogastroduodenoscopy and colonoscopy which showed a nodular mucosa of the stomach. Biopsies of the duodenum and colon were unremarkable. However, biopsies of the gastric fundus revealed a mild chronic gastritis characterized by lymphocytic and plasma cell infiltration of deep mucosa, without lymphoid follicle formation or active inflammation. No microorganisms were identified on routine hematoxylin and eosin or Giemsa-stained sections. Subepithelial collagen in the gastric biopsies was thickened and showed entrapped capillaries. Subepithelial collagen was highlighted by Masson's trichrome staining and was negative for amyloid by Congo Red. In the areas containing thickened collagen, there were no intraepithelial lymphocytes. The final pathological diagnosis was collagenous gastritis. Collagenous gastritis is an extremely rare disease, but it is important to recognize its characteristic endoscopic and pathologic findings to make a correct diagnosis. Specific therapy for this rare entity has not yet been established. [J Interdiscipl Histopathol 2015; 3(2.000: 68-70

  17. Hawaii ESI: HABITATS (Habitat and Plant Polygons)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This data set contains sensitive biological resource data for corals, algae, seagrass, and native/rare terrestrial plants in coastal Hawaii. Vector polygons in this...

  18. Rare species support vulnerable functions in high-diversity ecosystems.

    Directory of Open Access Journals (Sweden)

    David Mouillot

    Full Text Available Around the world, the human-induced collapses of populations and species have triggered a sixth mass extinction crisis, with rare species often being the first to disappear. Although the role of species diversity in the maintenance of ecosystem processes has been widely investigated, the role of rare species remains controversial. A critical issue is whether common species insure against the loss of functions supported by rare species. This issue is even more critical in species-rich ecosystems where high functional redundancy among species is likely and where it is thus often assumed that ecosystem functioning is buffered against species loss. Here, using extensive datasets of species occurrences and functional traits from three highly diverse ecosystems (846 coral reef fishes, 2,979 alpine plants, and 662 tropical trees, we demonstrate that the most distinct combinations of traits are supported predominantly by rare species both in terms of local abundance and regional occupancy. Moreover, species that have low functional redundancy and are likely to support the most vulnerable functions, with no other species carrying similar combinations of traits, are rarer than expected by chance in all three ecosystems. For instance, 63% and 98% of fish species that are likely to support highly vulnerable functions in coral reef ecosystems are locally and regionally rare, respectively. For alpine plants, 32% and 89% of such species are locally and regionally rare, respectively. Remarkably, 47% of fish species and 55% of tropical tree species that are likely to support highly vulnerable functions have only one individual per sample on average. Our results emphasize the importance of rare species conservation, even in highly diverse ecosystems, which are thought to exhibit high functional redundancy. Rare species offer more than aesthetic, cultural, or taxonomic diversity value; they disproportionately increase the potential breadth of functions provided by

  19. Rare species support vulnerable functions in high-diversity ecosystems.

    Science.gov (United States)

    Mouillot, David; Bellwood, David R; Baraloto, Christopher; Chave, Jerome; Galzin, Rene; Harmelin-Vivien, Mireille; Kulbicki, Michel; Lavergne, Sebastien; Lavorel, Sandra; Mouquet, Nicolas; Paine, C E Timothy; Renaud, Julien; Thuiller, Wilfried

    2013-01-01

    Around the world, the human-induced collapses of populations and species have triggered a sixth mass extinction crisis, with rare species often being the first to disappear. Although the role of species diversity in the maintenance of ecosystem processes has been widely investigated, the role of rare species remains controversial. A critical issue is whether common species insure against the loss of functions supported by rare species. This issue is even more critical in species-rich ecosystems where high functional redundancy among species is likely and where it is thus often assumed that ecosystem functioning is buffered against species loss. Here, using extensive datasets of species occurrences and functional traits from three highly diverse ecosystems (846 coral reef fishes, 2,979 alpine plants, and 662 tropical trees), we demonstrate that the most distinct combinations of traits are supported predominantly by rare species both in terms of local abundance and regional occupancy. Moreover, species that have low functional redundancy and are likely to support the most vulnerable functions, with no other species carrying similar combinations of traits, are rarer than expected by chance in all three ecosystems. For instance, 63% and 98% of fish species that are likely to support highly vulnerable functions in coral reef ecosystems are locally and regionally rare, respectively. For alpine plants, 32% and 89% of such species are locally and regionally rare, respectively. Remarkably, 47% of fish species and 55% of tropical tree species that are likely to support highly vulnerable functions have only one individual per sample on average. Our results emphasize the importance of rare species conservation, even in highly diverse ecosystems, which are thought to exhibit high functional redundancy. Rare species offer more than aesthetic, cultural, or taxonomic diversity value; they disproportionately increase the potential breadth of functions provided by ecosystems across

  20. Naegleria meningitis : a rare survival.

    Directory of Open Access Journals (Sweden)

    Jain R

    2002-10-01

    Full Text Available Acute amebic meningoencephalitis caused by free-living amebae naegleria fowleri is extremely rare and uniformly fatal with only seven survivals reported till date. An interesting case of naegleria meningitis diagnosed by wet mount cytology of cerebrospinal fluid (CSF and treated with amphoterecin B, rifampicin and ornidazole with complete recovery is presented. In cases of suspected pyogenic meningitis, if CSF staining, antigen detection or culture is negative for bacteria, a wet mount cytology of CSF for naegleria is suggested. Early treatment with amphoterecin B and rifampicin may improve survival.

  1. Retroperitoneal Schwannoma: A Rare Case

    Directory of Open Access Journals (Sweden)

    Murat Kalaycı

    2011-01-01

    Case Presentation. A 38-year-old woman was admitted to the emergency service with the complaints of progressive abdominal pain and nausea for the last 24 hours. Abdominal examination was compatible with acute abdomen. Acute appendicitis was diagnosed by CT. During CT evaluation, a round shaped soft-tissue mass at the retroperitoneal area inferior to the right kidney was detected, The mass was resected and histology revealed schwannoma. Conclusion. Rare tumoral lesions with benign course such as schwannoma can be detected incidentally.

  2. 2006 Rare Earth Export Quota

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ According to correlative stipulations in "Goods Import εt Export Administrating Statute of P.R.C", 2006export quota for important industrial products was issued by the Ministry of Commerce of P.R.C. on December 30th of 2005. Export quota of rare earth products is 45,000 tons. It is said the quota will be distributed in two batches. The first batch of quota will reach 70-80% of the total with 21,700 - 24,800tons for domestic companies and 10,500 - 12,000 tons for foreign invested companies. Quota will be distributed to relevant enterprises directly in recent days.

  3. Maxillary Osteomyelitis: A Rare Entity

    Directory of Open Access Journals (Sweden)

    Ayaaz Habib

    2016-01-01

    Full Text Available Osteomyelitis of the maxilla is now a rare event with the advent of antibiotics. The two predominant causes are odontogenic infections and sinusitis. Immunocompromised states such as diabetes, HIV, and malnutrition increase the risk of osteomyelitis. It is important to recognize this early as it is a difficult entity to treat with potentially serious consequences. We report an unusual case of right sided maxillary osteomyelitis in a lady with poorly controlled diabetes in rural Lincolnshire. Biopsy of the right maxillary bone showed features of acute osteomyelitis. This responded well to a prolonged course of oral antibiotics.

  4. Consumer preference for seeds and seedlings of rare species impacts tree diversity at multiple scales.

    Science.gov (United States)

    Young, Hillary S; McCauley, Douglas J; Guevara, Roger; Dirzo, Rodolfo

    2013-07-01

    Positive density-dependent seed and seedling predation, where herbivores selectively eat seeds or seedlings of common species, is thought to play a major role in creating and maintaining plant community diversity. However, many herbivores and seed predators are known to exhibit preferences for rare foods, which could lead to negative density-dependent predation. In this study, we first demonstrate the occurrence of increased predation of locally rare tree species by a widespread group of insular seed and seedling predators, land crabs. We then build computer simulations based on these empirical data to examine the effects of such predation on diversity patterns. Simulations show that herbivore preferences for locally rare species are likely to drive scale-dependent effects on plant community diversity: at small scales these foraging patterns decrease plant community diversity via the selective consumption of rare plant species, while at the landscape level they should increase diversity, at least for short periods, by promoting clustered local dominance of a variety of species. Finally, we compared observed patterns of plant diversity at the site to those obtained via computer simulations, and found that diversity patterns generated under simulations were highly consistent with observed diversity patterns. We posit that preference for rare species by herbivores may be prevalent in low- or moderate-diversity systems, and that these effects may help explain diversity patterns across different spatial scales in such ecosystems.

  5. Catalogue of Korean manuscripts and rare books

    DEFF Research Database (Denmark)

    Lerbæk Pedersen, Bent

    2014-01-01

    Catalogue of Korean manuscripts and rare books in The Royal Library, Copenhagen and the National Museum of Denmark......Catalogue of Korean manuscripts and rare books in The Royal Library, Copenhagen and the National Museum of Denmark...

  6. Rare case of Hirayama's disease

    Directory of Open Access Journals (Sweden)

    Rohan Bharat Gala

    2015-06-01

    Full Text Available Hirayama's disease is a rare benign neurological disorder also known as monomelic amyotrophy, Sobue disease, Juvenile Muscular Atrophy of Distal Upper Extremity (JMADUE. It mainly affects young males in their second or third decades and is most commonly seen in Asian countries like Japan, Malaysia and India. In majority of the cases the cause of the disease is unknown. An 18 year male came with weakness in his right hand and forearm since 1 year. Examination revealed weakness and wasting of muscles of forearm and hand without lower limb involvement and normal deep tendon reflexes. MRI showed focal short segment hyperintense signal in the ventral and right lateral aspect of the cervical cord at C5-C6 level with the involved segment measuring 4x3mm in size. Based on clinical and radiological features a diagnosis of focal amyotrophy was made. Patient is given a cervical collar to prevent flexion at the neck and physiotherapy in the form of hand and forearm exercises were started. Regular follow up of the patient once every 2 months is being done. Hirayama's disease is a rare, benign, self-limiting neurological disorder. Early diagnosis and management by preventing cervical flexion with the help of a cervical collar has shown to halt the progression of the disease. [Int J Res Med Sci 2015; 3(3.000: 767-770

  7. Rare gastrointestinal lymphomas: the endoscopicinvestigation

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    Gastrointestinal lymphomas represent up to 10% ofgastrointestinal malignancies and about one third of non-Hodgkin lymphomas. The most prominent histologies aremucosa-associated lymphoid tissue lymphoma and diffuselarge B-cell lymphoma. However, the gastrointestinaltract can be the site of rarer lymphoma subtypes as aprimary or secondary localization. Due to their rarity andthe multifaceted histology, an endoscopic classificationhas not been validated yet. This review aims to analyzethe endoscopic presentation of rare gastrointestinallymphomas from disease diagnosis to follow-up,according to the involved site and lymphoma subtype.Existing, new and emerging endoscopic technologieshave been examined. In particular, we investigated thediagnostic, prognostic and follow-up endoscopic featuresof T-cell and natural killer lymphomas, lymphomatouspolyposis and mantle cell lymphoma, follicular lymphoma,plasma cell related disease, gastrointestinal lymphomasin immunodeficiency and Hodgkin's lymphoma ofthe gastrointestinal tract. Contrarily to more frequentgastrointestinal lymphomas, data about rare lymphomasare mostly extracted from case series and casereports. Due to the data paucity, a synergism betweengastroenterologists and hematologists is required in order to better manage the disease. Indeed, clinicaland prognostic features are different from nodal andextranodal or the bone marrow (in case of plasma celldisease) counterpart. Therefore, the approach shouldbe based on the knowledge of the peculiar behavior andnatural history of disease.

  8. Teeth in Rare Locations with Rare Complications: An Overview.

    Science.gov (United States)

    Dhingra, Shruti; Gulati, Achal

    2015-12-01

    Ectopic presence of teeth within the dentate region is common in clinical practice. However, the presence of teeth in non-dentate areas such as the nasal cavity or the maxillary sinus is rare. These may remain asymptomatic for years, may be misdiagnosed as foreign bodies, or may present with some serious complications involving the nose and paranasal sinuses. Complications such as nasal obstruction, epistaxis, headaches, rhinolith formation, epiphora, sinusitis and oro-antral fistula have been well described in literature, however, very few cases of antro-cutaneous fistulas have been reported. We discuss three cases of ectopic eruptions of teeth, all occurring in children. The clinical and radiographic findings of the cases, possible etiology, complication, diagnosis and treatment are discussed.

  9. Rare Earths; The Fraternal Fifteen (Rev.)

    Energy Technology Data Exchange (ETDEWEB)

    Gschneidner, Jr., Karl A. [Iowa State University; Ames Laboratory

    1966-01-01

    Rare earths are a set of 15 elements: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. They are not rare and not earths; they are metals and quite abundant. They are studied to develop commercial products which are beneficial to mankind, and because some rare earths are important to fission products.

  10. Frequently Asked Questions about Rare Diseases

    Science.gov (United States)

    ... page What are some examples of rare diseases? Examples of rare diseases caused by mutations in single genes include cystic fibrosis, which affects ... responsible for some rare, inherited types of cancer. Examples of these are ... which certain mutations increase the risk for hereditary breast and ovarian ...

  11. Restoration of rare earth mine areas: organic amendments and phytoremediation.

    Science.gov (United States)

    Zhou, Lingyan; Li, Zhaolong; Liu, Wen; Liu, Shenghong; Zhang, Limin; Zhong, Liyan; Luo, Ximei; Liang, Hong

    2015-11-01

    Overexploitation of rare earth mine has caused serious desertification and various environmental issues, and ecological restoration of a mining area is an important concern in China. In this study, experiments involving dry grass landfilling, chicken manure broadcasting, and plant cultivation were carried out to reclaim a rare earth mine area located in Heping County, Guangdong Province, China. The prime focus was to improve soil quality in terms of nutrients, microbial community, enzyme activity, and physicochemical properties so as to reclaim the land. After 2 years of restoration, an increase of organic matter (OM), available potassium (K), available phosphorus (P) levels, and acid phosphatase (ACP) activity and a reduction of the available nitrogen (N) level and urease (URE) activity in soil were achieved compared to the original mined land. The nutrients and enzyme activities in soil with 5 years of restoration were close to or surpass those in the unexploited land as control. The bulk density, total porosity, water holding capacity, pH, and electrical conductivity (EC) of soil were improved, and the number of cultivable microorganisms and the bacterial diversity in soil were greatly increased with time during ecological restoration, especially for surface soil. Furthermore, the artificial vegetation stably grew at the restored mining sites. The results indicated that organic amendments and phytoremediation could ecologically restore the rare earth mining sites and the mined land could finally be planted as farmland.

  12. Research on Rare Earth Encapsulated Luminescent Material

    Institute of Scientific and Technical Information of China (English)

    Yu Zhiwei; Liu Chengdong; Qi Xiaopeng

    2004-01-01

    A new method of preparation of irradiative material by using rare earth as luminophor and inorganic powder as base nucleus was presented.Rare earth was used to make colloid, which was mixed with base nucleus solution,where deposition/attachment reaction took place and rare earth was adhered onto the surface of base nucleus, hence yielding a new rare earth encapsulated irradiative material.Fluorescent spectrum analysis shows that this material possesses two emission peaks, one within 400 ~ 500 nm and the other within 580 ~ 700 nm, reflecting the luminous characteristics of original rare earth material.

  13. Rare Decays of the $\\eta^{'}$

    CERN Document Server

    Briere, R A; Ford, W T; Gritsan, A; Krieg, H; Roy, J D; Smith, J G; Alexander, J P; Baker, R; Bebek, C; Berger, B E; Berkelman, K; Blanc, F; Boisvert, V; Cassel, David G; Dickson, M; Von Dombrowski, S; Drell, P S; Ecklund, K M; Ehrlich, R; Foland, A D; Gaidarev, P B; Galik, R S; Gibbons, L K; Gittelman, B; Gray, S W; Hartill, D L; Heltsley, B K; Hopman, P I; Jones, C D; Kreinick, D L; Lee, T; Liu, Y; Meyer, T O; Mistry, N B; Ng, C R; Nordberg, E; Patterson, J R; Peterson, D; Riley, D; Thayer, J G; Thies, P G; Valant-Spaight, B L; Warburton, A; Avery, P; Lohner, M; Prescott, C; Rubiera, A I; Yelton, J; Zheng, J; Brandenburg, G; Ershov, A; Gao, Y S; Kim, D Y J; Wilson, R; Browder, T E; Li, Y; Rodríguez, J L; Yamamoto, H; Bergfeld, T; Eisenstein, B I; Ernst, J; Gladding, G E; Gollin, G D; Hans, R M; Johnson, E; Karliner, I; Marsh, M A; Palmer, M; Plager, C; Sedlack, C; Selen, M; Thaler, J J; Williams, J; Edwards, K W; Janicek, R; Patel, P M; Sadoff, A J; Ammar, R; Baringer, P; Bean, A; Besson, D; Coppage, D; Davis, R; Kotov, S A; Kravchenko, I V; Kwak, N; Zhao, X; Anderson, S; Frolov, V V; Kubota, Y; Lee, S J; Mahapatra, R; O'Neill, J J; Poling, R A; Riehle, T; Smith, A; Ahmed, S; Alam, M S; Athar, S B; Jian, L; Ling, L; Mahmood, A H; Saleem, M; Timm, S; Wappler, F; Anastassov, A; Duboscq, J E; Gan, K K; Gwon, C; Hart, T; Honscheid, K; Kagan, H; Kass, R; Lorenc, J; Schwarthoff, H; Spencer, M B; Von Törne, E; Zoeller, M M; Richichi, S J; Severini, H; Skubic, P L; Undrus, A E; Bishai, M; Chen, S; Fast, J; Hinson, J W; Lee, J; Menon, N; Miller, D H; Shibata, E I; Shipsey, I P J; Kwon, Y; Lyon, A L; Thorndike, E H; Jessop, C P; Lingel, K; Marsiske, H; Perl, Martin Lewis; Savinov, V; Ugolini, D W; Zhou, X; Coan, T E; Fadeev, V; Korolkov, I Ya; Maravin, Y; Narsky, I; Stroynowski, R; Ye, J; Wlodek, T; Artuso, M; Ayad, R; Dambasuren, E; Kopp, S E; Majumder, G; Moneti, G C; Mountain, R; Schuh, S; Skwarnicki, T; Stone, S; Titov, A; Viehhauser, G; Wang, J C; Wolf, A; Wu, J; Csorna, S E; McLean, K W; Marka, S; Xu, Z; Godang, R; Kinoshita, K; Lai, I C; Pomianowski, P A; Schrenk, S; Bonvicini, G; Cinabro, D; Greene, R; Perera, L P; Zhou, G J; Chan, S; Eigen, G; Lipeles, E; Schmidtler, M; Shapiro, A; Sun, W M; Urheim, J; Weinstein, A J; Würthwein, F; Jaffe, D E; Masek, G E; Paar, H P; Potter, E M; Prell, S; Sharma, V; Asner, D M; Eppich, A; Gronberg, J B; Hill, T S; Lange, D J; Morrison, R J; Nelson, T K; Richman, J D; Roberts, D

    2000-01-01

    We have searched for the rare decays of the eta prime meson to e+ e- eta, e+ e- pizero, e+ e- gamma, and e mu in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb^-1 of e+ e- collisions at the Cornell Electron Storage Ring. We find no signal in any of these modes, and set 90% confidence level upper limits on their branching fractions of 2.4 X 10^-3, 1.4 X 10^-3, 0.9 X 10^-3, and 4.7 X 10^-4, respectively. We also investigate the Dalitz plot of the common decay of the eta prime to pi+ pi- eta. We fit the matrix element with the Particle Data Group parameterization and find Re(alpha) = -0.021 +- 0.025, where alpha is a linear function of the kinetic energy of the eta.

  14. A rare epididymal mass: Leiomyoma

    Directory of Open Access Journals (Sweden)

    Tufan Cicek

    2014-04-01

    Full Text Available Leiomyoma is a benign smooth muscle tumor. It rarely rises from epididymal structures and usually is encountred in adults. The patient, who had undergone total epididymectomy for right scrotal mass at another center, was diagnosed with Epididymal Leiomyoma. He was admitted to our clinic for further evaluation and follow up. The previous eididymectomy specimens obtained and refered to our pathology department for confirmation of diagnosis. Microscopy revealed a benign neoplastic lesion, consisting of spindle cells. Which form interlacing bundels.Mitotic figures and tumor necrosis was not. Observed. The previous diagnosis is confirmed as the tumor showed immunohistochemical smooth muscule actin and Desmin posivity Whereas S-100 was not expressed with in the tumoral cells. This case report also overviews epididymal leiomyoma with recent literature findings. [Cukurova Med J 2014; 39(2.000: 399-402

  15. Liposarcome dorsal: aspect clinique rare

    Science.gov (United States)

    Agbessi, Odry; Arrob, Adil; Fiqhi, Kamal; Khalfi, Lahcen; Nassih, Mohammed; El Khatib, Karim

    2015-01-01

    Décrit la première fois par Virchow en 1860, le liposarcome est une tumeur mésenchymateuse rare. Cette rareté est relative car les liposarcomes représentent quand même 14 à 18% de l'ensemble des tumeurs malignes des parties molles et ils constituent le plus fréquent des sarcomes des parties molles. Pour la majorité des auteurs, il ne se développerait jamais sur un lipome ou une lipomatose préexistant. Nous rapportons un cas de volumineux liposarcome de la face dorsale du tronc. L'histoire de la maladie, l'aspect clinique inhabituel « de tumeur dans tumeur », l'aspect de la pièce opératoire nous fait évoquer la possibilité de la transformation maligne d'un lipome bénin préexistant. PMID:26113914

  16. RARE CASE OF COLONIC METASTASIS

    Directory of Open Access Journals (Sweden)

    Vinod Kumar

    2015-04-01

    Full Text Available Colon cancer is the second most common type of cancer in females and the third in males worldwide. The most common sites of colon cancer metastasis are the regional lymph nodes, liver, lung, bone and brain. In this case report, an extremely rare case of colon adenocarcinoma with metastasis to the philtrum with extensive peritoneal and bowel involvement is presented. A 44 year old male presented with a change in bowel habits, melena and weight loss . Diagnosed to have carcinoma rectum underwent Abdominoperenial resection (APR two y ears back. Biopsies were consistent with the diagnosis of invasive moderately differentiated adenocarcinoma. Now presented with swelling over philtrum . Fine needle aspiration (FNAC was done suggestive of adenocarcinoma. This case presented for its uncommon presentation.

  17. Rare complications of cesarean scar

    Directory of Open Access Journals (Sweden)

    Divyesh Mahajan

    2013-01-01

    Full Text Available Cesarean scar pregnancy (CSP and cesarean scar dehiscence (CSD are the most dreaded complications of cesarean scar (CS. As the incidence of CS is increasing worldwide, so is the incidence of CSP, especially in cases with assisted reproduction techniques. It is of utmost importance to diagnose CSP in the early first trimester, as it can lead to myometrial rupture with fatal outcome. On the other hand, CSD may be encountered during pregnancy or in the postpartum period. CSD in the postpartum period is very rare and can cause secondary postpartum hemorrhage (PPH leading to increased maternal morbidity or even death if not diagnosed and managed promptly. Both complications can be diagnosed on ultrasonography (USG and confirmed on magnetic resonance imaging (MRI. These two conditions carry high morbidity and mortality. In this article, we highlight the role of imaging in the early diagnosis and management of these conditions.

  18. Splenic abscess: a rare presentation

    Directory of Open Access Journals (Sweden)

    Mohit Bhatia

    2015-01-01

    Full Text Available Splenic abscess is a rare clinical entity with an incidence of 0.2-0.7% in autopsy-based studies. When untreated, splenic abscess is associated with nearly 100% mortality; in treated patients, the mortality rate is 16.6% during the first 90 days. It mostly occurs in patients with neoplasia, immunodeficiency, trauma, diabetes or splenic infarct. The incidence of splenic abscess is thought to be growing because of the increase in the number of immunocompromised patients who are particularly at risk for this disease and also because of the widespread use of diagnostic modalities. However, the optimal treatment for this remains unclear. We present a case of a 42-year-old man diagnosed with multiloculated splenic abscess and was subjected to splenectomy.

  19. Rare earth elements: end use and recyclability

    Science.gov (United States)

    Goonan, Thomas G.

    2011-01-01

    Rare earth elements are used in mature markets (such as catalysts, glassmaking, lighting, and metallurgy), which account for 59 percent of the total worldwide consumption of rare earth elements, and in newer, high-growth markets (such as battery alloys, ceramics, and permanent magnets), which account for 41 percent of the total worldwide consumption of rare earth elements. In mature market segments, lanthanum and cerium constitute about 80 percent of rare earth elements used, and in new market segments, dysprosium, neodymium, and praseodymium account for about 85 percent of rare earth elements used. Regardless of the end use, rare earth elements are not recycled in large quantities, but could be if recycling became mandated or very high prices of rare earth elements made recycling feasible.

  20. Plant reproduction is altered by simulated herbicide drift toconstructed plant communities

    Science.gov (United States)

    Herbicide drift may have unintended impacts on native vegetation, adversely affecting structure and function of plant communities. However, these potential effects have been rarely studied or quantified. To determine potential ecological effects of herbicide drift, we construct...

  1. The Chinese Society of Rare Earth is Studying The Feasibility of Marketing Rare Earth Futures

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    Lin Donglu,secretary-general of the Chinese Society of Rare Earth recently said,the Chinese Society of Rare Earth undertook the research on subject of the National Social Science Fund Foundation on the reform of Chinese rare earth trading pricing mechanism on promoting RMB globalization,and is focusing on studying the feasibility of marketing rare earth futures variety.

  2. Tungsten Toxicity in Plants

    Science.gov (United States)

    Adamakis, Ioannis-Dimosthenis S.; Panteris, Emmanuel; Eleftheriou, Eleftherios P.

    2012-01-01

    Tungsten (W) is a rare heavy metal, widely used in a range of industrial, military and household applications due to its unique physical properties. These activities inevitably have accounted for local W accumulation at high concentrations, raising concerns about its effects for living organisms. In plants, W has primarily been used as an inhibitor of the molybdoenzymes, since it antagonizes molybdenum (Mo) for the Mo-cofactor (MoCo) of these enzymes. However, recent advances indicate that, beyond Mo-enzyme inhibition, W has toxic attributes similar with those of other heavy metals. These include hindering of seedling growth, reduction of root and shoot biomass, ultrastructural malformations of cell components, aberration of cell cycle, disruption of the cytoskeleton and deregulation of gene expression related with programmed cell death (PCD). In this article, the recent available information on W toxicity in plants and plant cells is reviewed, and the knowledge gaps and the most pertinent research directions are outlined. PMID:27137642

  3. Microsites Matter: Improving the Success of Rare Species Reintroductions.

    Directory of Open Access Journals (Sweden)

    Peter W Dunwiddie

    Full Text Available Our study was undertaken to better understand how to increase the success rates of recovery plantings of a rare hemiparasite, golden paintbrush (Castilleja levisecta-Orobanchaceae. This species is endemic to western Washington and Oregon, USA, and southwestern British Columbia, Canada. Over 5000 golden paintbrush plants were outplanted as plugs in 2007 at six different native prairie sites that were considered to be suitable habitat, based on general evaluations of vegetation and soil conditions. Outplantings were installed at regular intervals along transects up to 1 km long to include a range of conditions occurring at each site. All plantings were re-examined five years later. The patchy distribution of surviving plugs and new recruits within each reintroduction site suggested success is strongly influenced by microsite characteristics. Indicator species analysis of taxa growing in microsites around outplanted golden paintbrush identified species that were positively or negatively associated with paintbrush survival. Species such as Festuca roemeri, Eriophyllum lanatum, and Viola adunca were strong indicators at some sites; non-natives such as Hypochaeris radicata and Teesdalia nudicaulis tended to be frequent negative indicators. Overall, higher richness of native perennial forbs was strongly correlated with both survival and flowering of golden paintbrush, a pattern that may reflect interactions of this hemiparasite with the immediately surrounding plant community. Topographic position also influenced outcomes, with greater survival occurring on mounds and in swales, where soils generally were deeper. Our findings suggest that assessments of site suitability based on vegetation alone, and coarser, site-level assessments that do not characterize heterogeneity at the microsite scale, may not be strong predictors of restoration success over the longer term and in sites with variability in vegetation and soils. By identifying suitable

  4. Poisonous Plants. LC Science Tracer Bullet.

    Science.gov (United States)

    Carter, Constance, Comp.

    There are a number of sources of information on the more than 700 species of plants, ferns, horsetails, and fungi that can cause toxic, though rarely fatal, reactions in humans and animals. This guide is intended for those who wish to review published materials on poisonous plants in the collections of the Library of Congress. It is not intended…

  5. Negative plant-soil feedbacks increase with plant abundance, and are unchanged by competition.

    Science.gov (United States)

    Maron, John L; Laney Smith, Alyssa; Ortega, Yvette K; Pearson, Dean E; Callaway, Ragan M

    2016-08-01

    Plant-soil feedbacks and interspecific competition are ubiquitous interactions that strongly influence the performance of plants. Yet few studies have examined whether the strength of these interactions corresponds with the abundance of plant species in the field, or whether feedbacks and competition interact in ways that either ameliorate or exacerbate their effects in isolation. We sampled soil from two intermountain grassland communities where we also measured the relative abundance of plant species. In greenhouse experiments, we quantified the direction and magnitude of plant-soil feedbacks for 10 target species that spanned a range of abundances in the field. In soil from both sites, plant-soil feedbacks were mostly negative, with more abundant species suffering greater negative feedbacks than rare species. In contrast, the average response to competition for each species was unrelated with its abundance in the field. We also determined how competitive response varied among our target species when plants competed in live vs. sterile soil. Interspecific competition reduced plant size, but the strength of this negative effect was unchanged by plant-soil feedbacks. Finally, when plants competed interspecifically, we asked how conspecific-trained, heterospecific-trained, and sterile soil influenced the competitive responses of our target species and how this varied depending on whether target species were abundant or rare in the field. Here, we found that both abundant and rare species were not as harmed by competition when they grew in heterospecific-trained soil compared to when they grew in conspecific-cultured soil. Abundant species were also not as harmed by competition when growing in sterile vs. conspecific-trained soil, but this was not the case for rare species. Our results suggest that abundant plants accrue species-specific soil pathogens to a greater extent than rare species. Thus, negative feedbacks may be critical for preventing abundant species from

  6. Decline of a Rare Moth at Its Last Known English Site: Causes and Lessons for Conservation.

    Directory of Open Access Journals (Sweden)

    David Baker

    Full Text Available The conditions required by rare species are often only approximately known. Monitoring such species over time can help refine management of their protected areas. We report population trends of a rare moth, the Dark Bordered Beauty Epione vespertaria (Linnaeus, 1767 (Lepidoptera: Geometridae at its last known English site on a protected lowland heath, and those of its host-plant, Salix repens (L. (Malpighiales: Salicaceae. Between 2007 and 2014, adult moth density reduced by an average of 30-35% annually over the monitored area, and its range over the monitored area contracted in concert. By comparing data from before this decline (2005 with data taken in 2013, we show that the density of host-plants over the monitored area reduced three-fold overall, and ten-fold in the areas of highest host-plant density. In addition, plants were significantly smaller in 2013. In 2005, moth larvae tended to be found on plants that were significantly larger than average at the time. By 2013, far fewer plants were of an equivalent size. This suggests that the rapid decline of the moth population coincides with, and is likely driven by, changes in the host-plant population. Why the host-plant population has changed remains less certain, but fire, frost damage and grazing damage have probably contributed. It is likely that a reduction in grazing pressure in parts of the site would aid host-plant recovery, although grazing remains an important site management activity. Our work confirms the value of constant monitoring of rare or priority insect species, of the risks posed to species with few populations even when their populations are large, of the potential conflict between bespoke management for species and generic management of habitats, and hence the value of refining our knowledge of rare species' requirements so that their needs can be incorporated into the management of protected areas.

  7. Rare and very rare adverse effects of clozapine

    Directory of Open Access Journals (Sweden)

    De Fazio P

    2015-08-01

    knowledge of the drug, clinical vigilance, and rapid intervention can drastically reduce the morbidity and mortality related to CLZ treatment. Keywords: clozapine, rare adverse effects, schizophrenia, atypical antipsychotic

  8. Pachyonychia congenita: A rare genodermatosis

    Directory of Open Access Journals (Sweden)

    Puneet Agarwal

    2013-01-01

    Full Text Available Pachyonychia congenita (PC is a rare genodermatosis with only 450 cases reported since 1906. It is of two types, type I due to mutation in genes 6a and 16, and 6b and 17 in type II with an autosomal dominant inheritance in both types. A 22 yr old female patient presented in our OPD with hypertrophy of finger and toe nails, palmoplantar keratoderma, oral punctuate leukokeratosis, hyperhidrosis in palms and soles with maceration and malodour since childhood. She had a positive family history with father and grandfather affected but less severely. Microscopy and culture of nail clippings and scrapping were done to rule out fungal infection. On biopsy acanthotic epidermis, parakeratosis, orthokeratosis were seen. No evidence of any associated malignancy was found after thorough workup. She was diagnosed as PC Type 1. She was put on topical steroids and orally on acetretin 25 mg OD. Paring of the nails was done too reduce the thickness of nails & to provide symptomatic relief. She was on a regular treatment for 3-4 months and showed some improvement in the form of reduced palmoplantar hyperkeratosis and reduced oral punctate keratosis but was later lost on followup. She showed no adverse effect to therapy during this period. This case is being reported because of its rarity.

  9. Tale of two rare diseases

    Science.gov (United States)

    Shukla, Ravindra; Basu, Asish Kumar; Mandal, Biplab; Mukhopadhyay, Pradip; Maity, Animesh; Sinha, Anirban

    2013-01-01

    Idiopathic Hypogonadotropic hypogonadism (IHH) phenotype is variable &various genes have been decribed in association with IHH. We describe association of IHH with mosaic trisomy 13. A 20 year old male presented with lack of development of secondary sexual characters, normal height, micropenis, small testes, gynaecomastia, absence of axillary and pubic hairs, hyposmia, synkinesis, bilateral horizontal nystagmus and high arched palate. Investigations showed low gonadotropin, low total testosterone, LH after stimulation with 100 mcg tryptorelin sc was 11.42 mU/mL at 40 min. MRI of hypothalamo-pituitary region showed normal olfactory bulb and tract but shallow olfactory sulcus. Karyotype showed homologous Robertsonian translocation of chromosome 13. This case fits classical IHH except for LH rise on stimulation. Features of Patau syndrome which is associated with trisomy 13 are absent in our case. Mosaic trisomy 13, which can otherwise be rare incidental finding, has not been described in association with IHH. Causal association of novel mutation on chromosome 13 leading to aforementioned phenotype cannot be rule out. PMID:24251138

  10. Recycling of Rare Earth Elements

    Science.gov (United States)

    Lorenz, Tom; Bertau, Martin

    2017-01-01

    Any development of an effective process for rare earth (RE) recycling has become more and more challenging, especially in recent years. Since 2011, when commodity prices of REs had met their all-time maximum, prices have dropped rapidly by more than 90 %. An economic process able to offset these fluctuations has to take unconventional methods into account beside well-known strategies like acid/basic leaching or solvent extraction. The solid-state chlorination provides such an unconventional method for mobilizing RE elements from waste streams. Instead of hydrochloric acid this kind of chlorination decomposes NH4Cl thermally to release up to 400 °C hot HCl gas. After cooling the resulting solid metal chlorides may be easily dissolved in pH-adjusted water. Without producing strongly acidic wastes and with NH4Cl as cheap source for hydrogen chloride, solid-state chlorination provides various advantages in terms of costs and disposal. In the course of the SepSELSA project this method was examined, adjusted and optimized for RE recycling from fluorescent lamp scraps as well as Fe14Nd2B magnets. Thereby many surprising influences and trends required various analytic methods to examine the reasons and special mechanisms behind them.

  11. Rare types of diabetes mellitus.

    Science.gov (United States)

    Mihai, B; Mihai, Cătălina; Cijevschi-Prelipcean, Cristina; Lăcătuşu, Cristina

    2012-01-01

    Diabetes mellitus is a heterogenous disorder characterized by chronic hyperglycemia and induced by a large number of etiopathogenic conditions. Beside type 1 and type 2 diabetes, which account for almost 90% of all cases, practitioners may encounter patients with more infrequent forms of diabetes, as those induced by mutations of a single gene, atypical immune disorders or neonatal diabetes. Monogenic diabetes is represented by genetic disorders in the structure of the beta-cell (the MODY syndromes and the mutations of mitochondrial DNA) or in the insulin's action (type A insulin resistance syndrome, Rabson-Mendenhall syndrome, leprechaunism, lipodystrophies). The rare forms of immune diabetes are determined by antibodies against insulin or insulin receptor or appear as a component of the "stiff man syndrome". Neonatal diabetes is induced by mutations in genes that control beta-cell development and function and may have a transient or permanent nature. Knowledge of the uncommon forms of diabetes mellitus enables physicians to apply the optimal treatment, to estimate the evolution of the patient and to apply a complete family screening in order to diagnose all other blood relatives as soon as possible.

  12. Tale of two rare diseases

    Directory of Open Access Journals (Sweden)

    Ravindra Shukla

    2013-01-01

    Full Text Available Idiopathic Hypogonadotropic hypogonadism (IHH phenotype is variable & various genes have been decribed in association with IHH.We describe association of IHH with mosaic trisomy 13. A 20 year old male presented with lack of development of secondary sexual characters, normal height, micropenis, small testes, gynaecomastia, absence of axillary and pubic hairs, hyposmia,synkinesis, bilateral horizontal nystagmus and high arched palate. Investigations showed low gonadotropin,low total testosterone, LH after stimulation with 100 mcg tryptorelin sc was 11.42 mU/mL at 40 min. MRI of hypothalamo-pituitary region showed normal olfactory bulb and tract but shallow olfactory sulcus . Karyotype showed homologous Robertsonian translocation of chromosome 13. This case fits classical IHH except for LH rise on stimulation.Features of Patau syndrome which is associated with trisomy 13 are absent in our case. Mosaic trisomy 13, which can otherwise be rare incidental finding , has not been described in association with IHH.Causal association of novel mutation on chromosome 13 leading to aforementioned phenotype cannot be rule out.

  13. Expert services for rare anaemias across Europe

    Directory of Open Access Journals (Sweden)

    Beatrice Gulbis

    2013-03-01

    Full Text Available New challenges and priorities are given in the EU Health programme 2007-2013. The objectives of the programme are to improve citizens’ health security, to promote health to improve prosperity and solidarity, and to generate and disseminate health knowledge. If challenges and priorities have been defined globally for rare diseases by the European Commission, persons involved in rare anaemias have taken the opportunity to contribute to the empowerment of patients with rare anaemias. One of the ENERCA partners objectives was the mapping of existing centres that take care of patients with rare anaemias in Europe. Another goal was to obtain a directory of facilities available per centre for patients with rare anaemias. We thought that with those results it could realistically help to define a consensus regarding the criteria to be recognised as a centre of expertise for haemoglobinopathies and very rare anaemias.

  14. Funing Rare Earths Industrial Co. Ltd

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The company covers separation with whole lines of light, medium and heavy rare earths, with annual separation volume of rare earth oxides of 4,500 tons. It also produces rare earth oxides, fluorides and salts. Products with high-purity and super-high-purity are produced according to customer's request. Under the technological guidance of domestic experts and application of modern high-pressure

  15. [Rare diseases from a life insurance perspective].

    Science.gov (United States)

    Senn, A; Filzmaier, K

    2015-12-01

    A rare disease is defined as a disease that affects a maximum of 5 in 10,000 people. As of today there are roughly 7000 different rare diseases known. On account of this one can say that "rare diseases are rare, but people affected by them are common". For Germany this amounts to: 4 million people that are affected by a rare disease. Diagnosis, therapeutic options and prognosis have substantially improved for some of the rare diseases. Besides the general medical advances--especially in the area of genetics--this is also due to networking and sharing information by so-called Centres of Competence on a national and international scale. This results in a better medical care for the corresponding group of patients. Against this backdrop, the number of people applying for life assurance who are suffering from a complex or rare disease has risen steadily in the last years. Due to the scarce availability of data regarding long-term prognosis of many rare diseases, a biomathematical, medical and actuarial expertise on the part of the insurer is necessary in order to adequately assess the risk of mortality and morbidity. Furthermore there is quite a focus on the issue of rare diseases from not only politics but society as well. Therefore evidence based medical assessment by insurers is especially important in this group of applicants--thinking of legal compliance and reputational risk.

  16. Genetic and Rare Diseases Information Center (GARD)

    Data.gov (United States)

    Federal Laboratory Consortium — NCATS collaborates with the National Human Genome Research Institute (NHGRI) to support GARD, a center designed to provide comprehensive information about rare and...

  17. Rare Infections: Yersinia Enterocolitica and Yersinia Pseudotuberculosis

    Science.gov (United States)

    ... Listen Text Size Email Print Share Rare Infections: Yersinia Enterocolitica and Yersinia Pseudotuberculosis Page Content Article Body Yersinia enterocolitica and Yersinia pseudotuberculosis are bacterial infections that are ...

  18. Review on Rare Earth/Polymer Composite

    Institute of Scientific and Technical Information of China (English)

    刘力; 刘美琳; 等

    2002-01-01

    The epecial properties of rare earth/polymer composite were described.More emphasis was put on the radiation shielding and magnetic properties,In the application to X-ray shielding,rare earth/polymer composite can make up the feeble absorbing area.If the rare earth content is high enough,it can demonstrate strong ability for thermal neutron absorption,The composite has strong paramagnetism.The feasibility of preparing magnetic rare earth/polymer compostite was discussed,In addition,three preparation methods were introducde:simlle polymerization,mixing and reaction processing,The effect of the rare earth/polymer composties pre-sturcture and the coordinate number of rare eatrh ions on the light property was analyzed,Rare earth/polmer compostie may have the structure and property simlar to those of the ionomer,The feasibility of the in-situ preparation of the rare earth/polymer nano structure is indicated ,Besides,the relationship between struchture and properties of the rare earth/polymer composite was discussed,The problems associated with such composite materials were also presented.

  19. Review on Rare Earth/Polymer Composite

    Institute of Scientific and Technical Information of China (English)

    刘力; 张立群; 赵素合; 金日光; 刘美琳

    2002-01-01

    The special properties of rare earth/polymer composite were described. More emph asis was put on the radiation shielding and magnetic properties. In the applicat ion to X-ray shielding, rare earth/polymer composite can make up the feeble abs o rbing area. If the rare earth content is high enough, it can demonstrate strong ability for thermal neutron absorption; The composite has strong paramagnetism. The feasibility of preparing magnetic rare earth/polymer composite was discussed . In addition, three preparation methods were introduced: simple polymerization, mixing and reaction processing. The effect of the rare earth/polymer composites pre -sturcture and the coordinate number of rare earth ions on the light property w as a nalyzed. Rare earth/polymer composite may have the structure and property simlar to those of the ionomer. The feasibility of the in-situ preparation of the rare earth/polymer nano structure is indicated. Besides, the relationship betwe en structure and properties of the rare earth/polymer composite was discussed. T he problems associated with such composite materials were also presented.

  20. Establishment of Cell Suspension Culture and Plant Regeneration in Abrus precatorius L., a Rare Medicinal Plant

    Directory of Open Access Journals (Sweden)

    Mohammad Serajur RAHMAN

    2012-02-01

    Full Text Available A new protocol has been developed for cell culture and in vitro regeneration of Abrus precatorius that holds enormous potentiality for preparation of medicines. In vitro grown calli were cultured in Murashige and Skoog (MS liquid media in agitated condition fortified with 0.5 mg/l 6-Benzylaminopurine. Growth curve of cells revealed that the cells continued to grow until 12 days of culture and got the highest peak from day 6-8. Isolated cell was found to produce highest 8.2% calli when suspended on MS medium supplemented with 0.5 mg/l 6-Benzylaminopurine and 0.1 mg/l 1-Naphthaleneacetic acid. Callus derived from single cell produced highest number of embryo (25-28% cultured on MS medium fortified with 2.0 mg/l 6-Benzylaminopurine and 0.2 mg/l 1-Naphthaleneacetic acid. The bipolar embryos were selected and optimum shoot formation was recorded on MS medium supplemented with 2.0 mg/l 6-Benzylaminopurine and 0.1 mg/l 1-Naphthaleneacetic acid. The optimum root induction was noticed in MS medium supplemented with 1.0 mg/l 3-Indolebutyric acid. Rooted plantlets were successfully transferred to potting soil and acclimatized to outdoor conditions.

  1. A rare cause of osteonecrosis

    Directory of Open Access Journals (Sweden)

    Paolo Agostinis

    2012-01-01

    Full Text Available IntroductionHereditary hemochromatosis (HH is an autosomal recessive disorder caused by mutations in the HFE gene, which increase intestinal iron absorption. The prevalence of C282Y homozygosity, which causes the disorder, is 0.5% in Caucasian populations. The clinical manifestations are related to excess iron in the tissues, especially the liver, heart, pancreas, pituitary, and skin. They include fatigue, loss of libido or impotence in males, liver disease, skin pigmentation, diabetes mellitus, cardiac enlargement—with or without heart failure, and conduction defects. The classic triad of cirrhosis, diabetes mellitus, and skin pigmentation (“bronze diabetes” results from a combination of iron deposits and melanin. It occurs late in the disease, when the total body iron content is more than five times the normal value, about 20 grams. Left untreated, approximately half of all patients with HH eventually develop arthralgia or arthropathy. Chondrocalcinosis, chronic pseudo-osteoarthritis, and osteoporosis are the major rheumatic manifestations of HH. The cause of the arthropathy is still unknown. Iron deposits within joints may trigger a number of pathologic events, such as free radical generation and crystal deposition, which stimulate immune complex formation and inflammation.Materials and methodsWe describe the case of a 48-year-old male suffering from chronic bilateral ankle pain.ResultsThe work-up revealed osteonecrosis of ankle. The patient also presented high plasma ferritin levels and homozygosity for the C282Y mutation. Other than HH, which was confirmed by liver biopsy, the patient had no other risk factors for osteonecrosis.DiscussionHH represents a rare cause of osteonecrosis, and there are no prior reports of aseptic osteonecrosis of the ankle in a patient with this disease. The pathogenetic mechanism remains unknown.

  2. [Research progress on plant diversity conservation in sand dune areas].

    Science.gov (United States)

    Liu, Zhi-min; Ma, Jun-ling

    2008-01-01

    The landscape in sand dune areas is characterized by the alternate distribution of sand dune and interdune lowland, and the unique floras in these areas are some endemic or rare plant species. In recent years, the decrease in plant species richness and the disappearance of some endemic or rare plant species in these areas have been received special attention, which were listed in the Program of International Biodiversity Conservation, and studied in many countries and districts. In this paper, the research progress in these fields was summarized from the aspects of significance of plant diversity conservation, formation mechanisms of plant diversity, ways of plant diversity conservation, roles of plant diversity research in the development of ecological theories, and important issues in operating plant diversity conservation project. To conserve plant diversity in sand dune areas, attentions should be paid to the differences in conservation goals (to maintain high species richness or to conserve endemic or rare species) among different regions, and the balances between the stabilization of active sand and the conservation of endemic or rare species, and the maintenance of high species richness and the conservation of endemic or rare species. It needed also to consider the sand dune and the interdune lowland as a unified landscape unit to explore the impacts of disturbances and habitat fragment on plant diversity.

  3. Insecticidal and Feeding Deterrent Effects of Fraxinellone from Dictamnus dasycarpus against Four Major Pests

    Directory of Open Access Journals (Sweden)

    Huixia Liu

    2013-03-01

    Full Text Available Fraxinellone, a well-known and significant naturally occurring compound isolated from Meliaceae and Rutaceae spp. has been widely used as a drug for the treatment of tumors. On the other hand, fraxinellone exhibited a variety of insecticidal activities including feeding-deterrent activity, inhibition of growth, and larvicidal activity. The present study focused on the antifeedant and larvicidal activities of fraxinellone against the larvae of Lepidoptera, including Mythimna separata, Agrotis ypsilon, Plutella xylostella, and one kind of sanitary pest, Culux pipiens pallens. Meanwhile, the ovicidal activities and the effects of fraxinellone on the larval development of M. separata were also observed. The LC50 values of fraxinellone against 3rd instar larvae of M. separata, 2nd instar larvae of P. xylostella and 4th instar larvae of C. pipiens pallens were 15.95/6.43/3.60 × 10−2 mg mL−1, and its AFC50 values against 5th instar larvae of M. separata, 2nd instar larvae of P. xylostella and 2nd instar larvae of A. ypsilon were 10.73/7.93/12.58 mg mL−1, respectively. Compared with the control group, fraxinellone obviously inhibited the pupation rate and the growth of M. separata. Once M. separata was treated with fraxinellone at concentrations of 5.0, 10.0, and 20.0 mg mL−1, respectively, the stages from the larvae to adulthood and the egg hatching duration were prolonged to 1/2/3, and 4/3/4 days, respectively. Additionally, fraxinellone strongly inhibited the development rate and the egg hatch proportion of M. separata.

  4. Endangered, threatened, and rare vascular flora of the Savannah River Site

    Energy Technology Data Exchange (ETDEWEB)

    Knox, J.N.; Sharitz, R.R.

    1990-01-01

    This report summarizes information on the 30 endangered, threatened, or rare plants found on the Savannah River Site, Aiken, South Carolina. Of these 30 species, eight are under review by the US Fish and Wildlife Service as possible candidates for the proposed threatened and endangered list. Twenty-seven of the species are on the state of South Carolina's list prepared by the South Carolina Advisory Committee on Rare, Threatened, and Endangered Vascular Plants. These 27 plants include regionally threatened species, statewide threatened species, and rare species. Approximately two-thirds of these plants are found in wetland habitats. Also included in this report are summaries of 29 plant species that are likely to occur on the SRS, but have not been found there. Fourteen of these plants are on the federal list and range in status from endangered to possible candidates for deletion from the list. Twenty-eight are on the state of South Carolina list; approximately two-thirds of these also occur in wetland habitats. 31 refs., 45 figs., 2 tabs.

  5. Social and Environmental Impact of the Rare Earth Industries

    Directory of Open Access Journals (Sweden)

    Saleem H. Ali

    2014-02-01

    Full Text Available The use of rare earth elements in various technologies continues to grow despite some alternatives being found for particular uses. Given a history of ecological concerns about pollution from rare earth mines, particularly in China, there are growing social and environmental concerns about the growth of the mining and mineral processing in this sector. This is best exemplified by the recent social and environmental conflict surrounding the development of the Lynas Advanced Materials Plant (LAMP in Kuantan, Malaysia which led to international activism and claims of environmental and social injustice. This paper analyses the structure of environmental and social conflicts surrounding rare earth minerals and opportunities for improving the social and environmental performance of the sector. Many of these elements are used for green technologies. Opportunities exist that offer a more circular supply chain following industrial ecological principles through which reuse and recycling of the materials can provide a means of mitigating social and environmental conflicts in this sector. In addition, public engagement processes that recognize community concerns about radiation, and transparent scientifically predicated decision-making through an appropriate governance structure within regulatory organizations are also presented.

  6. Photoionization of rare gas clusters

    Science.gov (United States)

    Zhang, Huaizhen

    This thesis concentrates on the study of photoionization of van der Waals clusters with different cluster sizes. The goal of the experimental investigation is to understand the electronic structure of van der Waals clusters and the electronic dynamics. These studies are fundamental to understand the interaction between UV-X rays and clusters. The experiments were performed at the Advanced Light Source at Lawrence Berkeley National Laboratory. The experimental method employs angle-resolved time-of-flight photoelectron spectrometry, one of the most powerful methods for probing the electronic structure of atoms, molecules, clusters and solids. The van der Waals cluster photoionization studies are focused on probing the evolution of the photoelectron angular distribution parameter as a function of photon energy and cluster size. The angular distribution has been known to be a sensitive probe of the electronic structure in atoms and molecules. However, it has not been used in the case of van der Waals clusters. We carried out outer-valence levels, inner-valence levels and core-levels cluster photoionization experiments. Specifically, this work reports on the first quantitative measurements of the angular distribution parameters of rare gas clusters as a function of average cluster sizes. Our findings for xenon clusters is that the overall photon-energy-dependent behavior of the photoelectrons from the clusters is very similar to that of the corresponding free atoms. However, distinct differences in the angular distribution point at cluster-size-dependent effects were found. For krypton clusters, in the photon energy range where atomic photoelectrons have a high angular anisotropy, our measurements show considerably more isotropic angular distributions for the cluster photoelectrons, especially right above the 3d and 4p thresholds. For the valence electrons, a surprising difference between the two spin-orbit components was found. For argon clusters, we found that the

  7. Rare Malignant Tumors of the Breast

    OpenAIRE

    Trevor Miller; Constance Albarracin; Selin Carkaci; Whitman, Gary J.; Adrada, Beatriz E.

    2015-01-01

    While the more common forms of breast cancer are well understood and recognized, there are many important rare malignancies that are less appreciated. Many of these cancers have imaging findings that, when understood, help to formulate a more educated differential diagnosis. In this article, the clinical features, imaging, and pathologic findings of rare breast malignancies will be discussed.

  8. Rare Malignant Tumors of the Breast

    Directory of Open Access Journals (Sweden)

    Trevor Miller

    2015-01-01

    Full Text Available While the more common forms of breast cancer are well understood and recognized, there are many important rare malignancies that are less appreciated. Many of these cancers have imaging findings that, when understood, help to formulate a more educated differential diagnosis. In this article, the clinical features, imaging, and pathologic findings of rare breast malignancies will be discussed.

  9. Acne Rosacea With Rare Eye Changes

    OpenAIRE

    Mittal R R; Kaur Karamjit

    2000-01-01

    One 55 year old army officer had all 3 variants of acane rosacea occurring simultaneously for 9 years. Associated rare, serious complications as prominent rosacea keratitis, deterioration of vision, rhinophyma and lymphoedema were seen. We are reporting the present case as the above combination is rare.

  10. Lipoma in the Palate: A Rare Presentation

    Directory of Open Access Journals (Sweden)

    A Winnifred Christy

    2010-01-01

    Lipoma occurring in the palate is rare with only six cases reported in the literature so far. This case of oral lipoma occurring in the hard plate is reported for its rarity and can be considered as a rare possibility in the differential diagnosis of various swellings of the palate.

  11. Queueing networks : Rare events and fast simulations

    NARCIS (Netherlands)

    Miretskiy, D.I.

    2009-01-01

    This monograph focuses on rare events. Even though they are extremely unlikely, they can still occur and then could have significant consequences. We mainly consider rare events in queueing networks. More precisely, we are interested in the probability of collecting some large number of jobs in the

  12. Hopes Dashed for Rare Bone Cancer Treatment

    Science.gov (United States)

    ... news/fullstory_160652.html Hopes Dashed for Rare Bone Cancer Treatment Extra chemo drugs failed to change course of ... t benefit patients with a rare type of bone cancer, according to a new ... teenagers. With current treatments, only 65 to 70 percent of patients live ...

  13. Rare earth elements and strategic mineral policy

    NARCIS (Netherlands)

    Kooroshy, J.; Korteweg, R.; Ridder, M. de

    2010-01-01

    Newspapers report almost daily on international tensions around ‘strategic’ or ‘critical’ minerals such as rare earth elements. The temporary freeze of rare earth exports from China to Japan in late 2010 in retaliation of the capture of a Chinese captain is but one example of the strategic use of no

  14. The rare histological forms of gallbladder cancer

    OpenAIRE

    Lytvynenko M.V.; Rosha L.G.; Chetverykov S.G.; Vododuk V.U.; Sherstiuk S.A.; Katsap A.V.

    2011-01-01

    In the practice of surgeons meet the rare forms of gallbladder cancer, with atypical clinical course. The aim of ourinvestigation was revealed peculiarity of clinical display the rarely forms of gallbladder cancer. According to literaturesquamous cell carcinoma found in the gallbladder in 7% case.

  15. A rare case of petrous apex osteoma.

    Science.gov (United States)

    Cece, Hasan; Yildiz, Sema; Iynen, Ismail; Karakas, Omer; Karakas, Ekrem; Dogan, Ferit

    2012-06-01

    Osteomas are the most common tumours of the cranial vault and facial skeleton. Temporal bone osteoma is a rare entity. An osteoma arising from the petrous apex is extremely rare. We present a case of osteoma arising from the petrous apex followed by a discussion of the etiology, presentation, and radiologic findings.

  16. [RARE DISEASES DTC: DIAGNOSIS, TREATMENT AND CARE].

    Science.gov (United States)

    Mendlovic, Joseph; Barash, Hila; Yardeni, Hadar; Banet-Levi, Yonit; Yonath, Hagith; Raas-Rothschild, Annick

    2016-04-01

    Rare diseases are chronic, progressive genetic disorders, which affect around 6-8% of the general population, mainly children. Therefore, in Israel approximately 500,000 people are probably affected by a rare disease. In this article, we review some of the issues pertaining to rare diseases, such as the need for accurate diagnosis which is necessary not only for specific care and treatment but also for informed family planning. In addition, we review the impact of the activities of patients' organizations on the awareness of rare diseases and their involvement in the creation of the Orphan Drug Act, which was the leading point on the way to drug development worldwide. During the last few years networks for reaching leading specialists' opinions on the way to proper diagnosis were created. Thereafter, the next generation genetic technologies, such as exome sequencing, have been a revolution in terms of options and hope for patients with rare undiagnosed diseases. Patients with rare diseases and their families are a challenge to the health care system, not only in terms of diagnosis and therapy, but also in terms of special needs. In addition, deciphering molecular pathways of rare diseases might be the key for understanding molecular events involved in common disorders. We emphasize the duty to ensure appropriate capacity and equal access to follow-up and clinical management of patients with rare diseases in Israel.

  17. Acne Rosacea With Rare Eye Changes

    Directory of Open Access Journals (Sweden)

    Mittal R R

    2000-01-01

    Full Text Available One 55 year old army officer had all 3 variants of acane rosacea occurring simultaneously for 9 years. Associated rare, serious complications as prominent rosacea keratitis, deterioration of vision, rhinophyma and lymphoedema were seen. We are reporting the present case as the above combination is rare.

  18. Xanthogranulomatous cystitis: A rare clinical entity

    Directory of Open Access Journals (Sweden)

    Singh Santosh

    2010-01-01

    Full Text Available Xanthogranulomatous cystitis (XC is a rare benign disease of unknown etiology. A case of XC in a 30-year-old male is presented due to sparcity of such case report in medical literature. Patient evaluation included clinical, biochemical and radiological studies before treatment. Histological study revealed the rare diagnosis. Patient was asymptomatic at eight weeks follow-up after treatment.

  19. Global rare earth resources and scenarios of future rare earth industry

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhanheng

    2011-01-01

    It is known to all that China is abundant in rare earth resources. But rare earth deposits are really not that rare in the earth crust. In the five continents, i.e. Asia, Europe, Australia, North and South America, and Africa, there are about thirty four countries found to have rare earth deposits; Brazil might surpass China and rank the first in rare earth deposits. At present, investment in rare earth production was surged,there have been about 200 projects, and the total production for 25 of them would be more than 170 thousand tons after 2015, a multi-supply system on rare earths is being established worldwide. Cautions on the investment of rare earth production are involved.

  20. RARE EARTH ELEMENT IMPACTS ON BIOLOGICAL WASTEWATER TREATMENT

    Energy Technology Data Exchange (ETDEWEB)

    Fujita, Y.; Barnes, J.; Fox, S.

    2016-09-01

    Increasing demand for rare earth elements (REE) is expected to lead to new development and expansion in industries processing and or recycling REE. For some industrial operators, sending aqueous waste streams to a municipal wastewater treatment plant, or publicly owned treatment works (POTW), may be a cost effective disposal option. However, wastewaters that adversely affect the performance of biological wastewater treatment at the POTW will not be accepted. The objective of our research is to assess the effects of wastewaters that might be generated by new rare earth element (REE) beneficiation or recycling processes on biological wastewater treatment systems. We have been investigating the impact of yttrium and europium on the biological activity of activated sludge collected from an operating municipal wastewater treatment plant. We have also examined the effect of an organic complexant that is commonly used in REE extraction and separations; similar compounds may be a component of newly developed REE recycling processes. Our preliminary results indicate that in the presence of Eu, respiration rates for the activated sludge decrease relative to the no-Eu controls, at Eu concentrations ranging from <10 to 660 µM. Yttrium appears to inhibit respiration as well, although negative impacts have been observed only at the highest Y amendment level tested (660 µM). The organic complexant appears to have a negative impact on activated sludge activity as well, although results are variable. Ultimately the intent of this research is to help REE industries to develop environmentally friendly and economically sustainable beneficiation and recycling processes.

  1. Rare Earth Metals: Resourcefulness and Recovery

    Science.gov (United States)

    Wang, Shijie

    2013-10-01

    When we appreciate the digital revolution carried over from the twentieth century with mobile communication and the Internet, and when we enjoy our high-tech lifestyle filled with iDevices, hybrid cars, wind turbines, and solar cells in this new century, we should also appreciate that all of these advanced products depend on rare earth metals to function. Although there are only 136,000 tons of annual worldwide demand, (Cho, Rare Earth Metals, Will We Have Enough?)1 rare earth metals are becoming such hot commodities on international markets, due to not only to their increasing uses, including in most critical military hardware, but also to Chinese growth, which accounts for 95% of global rare earth metal production. Hence, the 2013 technical calendar topic, planned by the TMS/Hydrometallurgy and Electrometallurgy Committee, is particularly relevant, with four articles (including this commentary) contributed to the JOM October Issue discussing rare earth metals' resourcefulness and recovery.

  2. Chinalco Rare Earth has Surpassed Ganzhou to Become the Biggest Giant in South China Rare Earth

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    As the pillar enterprise in Chinalco rare earth unit,Chinalco Guangxi Rare Earth Company firmly grasped the historical opportunity of the state government supporting six big groups including Chinalco to integrate and develop domestic rare earth enterprises,riding the east wind to stand out,recently,it made significant

  3. Projections of suitable habitat for rare species under global warming scenarios

    Science.gov (United States)

    F. Thomas Ledig; Gerald E. Rehfeldt; Cuauhtemoc Saenz-Romero; Flores-Lopez Celestino

    2010-01-01

    Premise of the study: Modeling the contemporary and future climate niche for rare plants is a major hurdle in conservation, yet such projections are necessary to prevent extinctions that may result from climate change. Methods: We used recently developed spline climatic models and modifi ed Random Forests...

  4. Dispersal distance and achene quality of the rare anemochorous species Arnica montana L. : implications for conservation

    NARCIS (Netherlands)

    Strykstra, RJ; Pegtel, DM; Bergsma, A

    1998-01-01

    In The Netherlands, Arnica montana (Asteraceae) is a, rare plant species. Future survival in The Netherlands depends on its; ability to disperse between source populations and habitats, newly created by man. Plumed Asteraceae achenes are often considered to disperse over large distances. Therefore,

  5. Recovery of rare earths from acid leach solutions of spent nickel-metal hydride batteries using solvent extraction

    Institute of Scientific and Technical Information of China (English)

    夏允; 肖连生; 田吉英; 李兆洋; 曾理

    2015-01-01

    The extraction of rare earths from acid leach solutions of spent nickel-metal hydride batteries using a primary amine ex-tractant of N1923 was studied. The effects of feed pH, temperature, agitation rate and time on the extraction of rare earths, as well as stripping agent composition and concentration, phase ratio on the stripping were investigated. In addition, the extraction isotherm was determined. The pilot plant test results showed that the extraction of rare earths reached 99.98% after a five-stage counter current ex-traction. The mixed rare earths oxalates with the 99.77% purity of rare earth elements and impurity content less than 0.05% were ob-tained by the addition of oxalic acids in loaded strip liquors. The extractant exhibited good selectivity of rare earths over base metals of iron, nickel, copper and manganese.

  6. Poisonous Plants

    Science.gov (United States)

    ... Publications and Products Programs Contact NIOSH NIOSH POISONOUS PLANTS Recommend on Facebook Tweet Share Compartir Photo courtesy ... U.S. Department of Agriculture Many native and exotic plants are poisonous to humans when ingested or if ...

  7. Aquatic plants

    DEFF Research Database (Denmark)

    Madsen, T. V.; Sand-Jensen, K.

    2006-01-01

    Aquatic fl owering plants form a relatively young plant group on an evolutionary timescale. The group has developed over the past 80 million years from terrestrial fl owering plants that re-colonised the aquatic environment after 60-100 million years on land. The exchange of species between...... terrestrial and aquatic environments continues today and is very intensive along stream banks. In this chapter we describe the physical and chemical barriers to the exchange of plants between land and water....

  8. Manufacturing Plants

    Institute of Scientific and Technical Information of China (English)

    TANG YUANKAI

    2010-01-01

    @@ Sunshine, air and soil are indispensable for green plants. This might be axi-omatic but not in a plant factory. By creating a plant factory, scientists are trying to grow plants where natural elements are deficient or absent, such as deserts,islands, water surfaces, South and North poles and space, as well as in human habi-tats such as skyscrapers in modern cities.

  9. Manufacturing Plants

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    China starts to produce vegetables and fruits in a factory sunshine,air and soil are indispensable for green plants. This might be axiomatic but not in a plant factory. By creating a plant factory,scientists are trying to grow plants where natural elements are deficient or absent,such as deserts, islands,water surfaces,South and North poles and space,as well as in human habitats such as skyscrapers in modern cities.

  10. Medicinal Plants.

    Science.gov (United States)

    Phillipson, J. David

    1997-01-01

    Highlights the demand for medicinal plants as pharmaceuticals and the demand for health care treatments worldwide and the issues that arise from this. Discusses new drugs from plants, anticancer drugs, antiviral drugs, antimalarial drugs, herbal remedies, quality, safety, efficacy, and conservation of plants. Contains 30 references. (JRH)

  11. Solar Energy Cell with Rare Earth Film

    Institute of Scientific and Technical Information of China (English)

    Li Baojun; Yang Tao; Zhou Yao; Zhou Meng; Fu Xiliang; Fu Li

    2004-01-01

    The characteristic of the solar energy cell with the rare earth film according to theory of molecular structure was introduced.When sunlight shines, the molecules of the rare earth film can absorb energy of the photon and jump to the excited state from the basic state, and play a role in storing solar energy.When sunlight do not shine, the electron of the excited state returns to the basic state, the rare earth film can automatically give out light and shine to surface of the solar cell, which can make solar cell continuously generate electric current.The rare earth film can absorb direct,scattering sunlight, and increase density of solar energy to reach surface of the solar cell, and play focusing function.The rare earth film can bear 350 ~ 500 ℃, which make the solar cell be able to utilize the focusing function system.Because after luminescence of the rare earth film, it can release again the absorbed solar energy through 1 ~ 8 h, and play a role in storing solar energy; The solar cell with the rare-earth film can generate electricity during night and cloudy days, and remarkably increase efficiency of the solar cell.

  12. [Global strategy for rare and intractable diseases].

    Science.gov (United States)

    Kawashima Kodama, Tomoko

    2013-01-01

    The progress has been made in research on rare and intractable diseases, for which new drug development has long been limited due to rarity, by establishing a global network in recent years. In Japan, the countermeasure of rare and intractable diseases has been implemented under national policy outline as an integrated strategy since 1972, including surveys and research, construction of medical facilities, reducing burden of medical expenses for patients, and enhancement of welfare and improving QOL of patients. Along with legislation or regulation of orphan drugs development, treatment and care for rare diseases have been emphasized in each national healthcare system globally. In the US, the Office of Rare Diseases was established under NIH in 1989 and European countries also started collaboration for rare disease projects with their own national plans in 1999. As a platform of rare diseases patients, healthcare professionals, researchers, pharmaceutical industry, and policy makers, Orphanet has a well-designed website which networks them. In Japan, there are urgent needs for global standard patient registration system and strengthening global collaboration for developing treatment and care for the patients of rare and intractable diseases, which needs more cooperative relations with patient organizations and pharmaceutical industry within country.

  13. Analyzing rare diseases terms in biomedical terminologies

    Directory of Open Access Journals (Sweden)

    Erika Pasceri

    2012-03-01

    Full Text Available Rare disease patients too often face common problems, including the lack of access to correct diagnosis, lack of quality information on the disease, lack of scientific knowledge of the disease, inequities and difficulties in access to treatment and care. These things could be changed by implementing a comprehensive approach to rare diseases, increasing international cooperation in scientific research, by gaining and sharing scientific knowledge about and by developing tools for extracting and sharing knowledge. A significant aspect to analyze is the organization of knowledge in the biomedical field for the proper management and recovery of health information. For these purposes, the sources needed have been acquired from the Office of Rare Diseases Research, the National Organization of Rare Disorders and Orphanet, organizations that provide information to patients and physicians and facilitate the exchange of information among different actors involved in this field. The present paper shows the representation of rare diseases terms in biomedical terminologies such as MeSH, ICD-10, SNOMED CT and OMIM, leveraging the fact that these terminologies are integrated in the UMLS. At the first level, it was analyzed the overlap among sources and at a second level, the presence of rare diseases terms in target sources included in UMLS, working at the term and concept level. We found that MeSH has the best representation of rare diseases terms.

  14. Ethical and social aspects on rare diseases

    Directory of Open Access Journals (Sweden)

    Krajnović Dušanka

    2012-01-01

    Full Text Available Rare diseases are a heterogenic group of disorders with a little in common except of their rarity affecting by less than 5 : 10.000 people. In the world is registered about 6000-8000 rare diseases with 6-8% suffering population only in the European Union. In spite of rarity, they represent an important medical and social problem due to their incidence. For many rare diseases have no treatment, but if it exists and if started on time as being available to patients, there is a good prognosis for them to be able for normal life. The problems of patients affected by rare diseases are related to the lack of diagnosis and timely undergoing as well as their treatment or prevention. Orphan drugs are products intended for treatment, diagnosis or prevention of rare diseases, but for their development and marketing the industry has not been interested in yet because of their marketing reasons. Patients suffering from a rare disease although belonging to the vulnerable group for their specific health needs, is becoming invisible in the health care system due to their additional needs un properly recognized. Ethical problems faced by patients, but also health care professionals are related to the allocation of medical diagnostics, unequal approach to health care, inappropriately specialized social services as well as therapy and rare orphan drugs unavailability. Ethical questions related to clinical trails on orphan drugs, population screening and epidemiology testing on rare diseases will also be discussed in this paper. [Projekat Ministarstva nauke Republike Srbije, br. 41004: Rare diseases: Molecular pathophysiology, the diagnostic and therapeutical modalities, social, ethical and legal aspects

  15. Ecology and exploration of the rare biosphere.

    Science.gov (United States)

    Lynch, Michael D J; Neufeld, Josh D

    2015-04-01

    The profound influence of microorganisms on human life and global biogeochemical cycles underlines the value of studying the biogeography of microorganisms, exploring microbial genomes and expanding our understanding of most microbial species on Earth: that is, those present at low relative abundance. The detection and subsequent analysis of low-abundance microbial populations—the 'rare biosphere'—have demonstrated the persistence, population dynamics, dispersion and predation of these microbial species. We discuss the ecology of rare microbial populations, and highlight molecular and computational methods for targeting taxonomic 'blind spots' within the rare biosphere of complex microbial communities.

  16. Rare kaon, muon, and pion decay

    Energy Technology Data Exchange (ETDEWEB)

    Littenberg, L.

    1998-12-01

    The author discusses the status of and prospects for the study of rare decays of kaons, muons, and pions. Studies of rare kaon decays are entering an interesting new phase wherein they can deliver important short-distance information. It should be possible to construct an alternative unitarity triangle to that determined in the B sector, and thus perform a critical check of the Standard Model by comparing the two. Rare muon decays are beginning to constrain supersymmetric models in a significant way, and future experiments should reach sensitivities which this kind of model must show effects, or become far less appealing.

  17. The Facility for Rare Isotope Beams

    Directory of Open Access Journals (Sweden)

    Wrede C.

    2015-01-01

    Full Text Available The Facility for Rare Isotope Beams (FRIB is a United States Department of Energy user facility currently under construction on the campus of Michigan State University. Based on a 400 kW, 200 MeV/u heavy-ion driver linac, FRIB will deliver high-quality fast, thermalized, and re-accelerated beams of rare isotopes with unprecedented intensities to a variety of experimental areas and equipment. New science opportunities at the frontiers of nuclear structure, nuclear astrophysics, fundamental symmetries, and societal applications will be enabled by this future world-leading rare-isotope beam facility.

  18. The Facility for Rare Isotope Beams

    Science.gov (United States)

    Wrede, C.

    2015-05-01

    The Facility for Rare Isotope Beams (FRIB) is a United States Department of Energy user facility currently under construction on the campus of Michigan State University. Based on a 400 kW, 200 MeV/u heavy-ion driver linac, FRIB will deliver high-quality fast, thermalized, and re-accelerated beams of rare isotopes with unprecedented intensities to a variety of experimental areas and equipment. New science opportunities at the frontiers of nuclear structure, nuclear astrophysics, fundamental symmetries, and societal applications will be enabled by this future world-leading rare-isotope beam facility.

  19. Adrenal Myelolipoma- A Rare Case Report

    Directory of Open Access Journals (Sweden)

    Vijayalaxmi V. Suranagi

    2009-05-01

    Full Text Available Adrenal myelolipoma (AML is a rare benign tumour composed of mature adipose tissue and hematopoietic tissue. Very few cases have been reported. Most of these patients are asymptomatic. We present a rare case of Adrenal Myelolipoma where the patient presented with hypertension and a clinical suspicion of Pheochromocytoma, which turned out to be an Adrenal myelolipoma. Adrenal myelolipoma is a rare entity, not encountered frequently and can occur as an incidental finding. Awareness regarding this entity is very much essential to exclude surgical exploration or extensive surgery.

  20. Autoluminescent plants.

    Directory of Open Access Journals (Sweden)

    Alexander Krichevsky

    Full Text Available Prospects of obtaining plants glowing in the dark have captivated the imagination of scientists and layman alike. While light emission has been developed into a useful marker of gene expression, bioluminescence in plants remained dependent on externally supplied substrate. Evolutionary conservation of the prokaryotic gene expression machinery enabled expression of the six genes of the lux operon in chloroplasts yielding plants that are capable of autonomous light emission. This work demonstrates that complex metabolic pathways of prokaryotes can be reconstructed and function in plant chloroplasts and that transplastomic plants can emit light that is visible by naked eye.

  1. Plant volatiles.

    Science.gov (United States)

    Baldwin, Ian T

    2010-05-11

    Plant volatiles are the metabolites that plants release into the air. The quantities released are not trivial. Almost one-fifth of the atmospheric CO2 fixed by land plants is released back into the air each day as volatiles. Plants are champion synthetic chemists; they take advantage of their anabolic prowess to produce volatiles, which they use to protect themselves against biotic and abiotic stresses and to provide information - and potentially disinformation - to mutualists and competitors alike. As transferors of information, volatiles have provided plants with solutions to the challenges associated with being rooted in the ground and immobile.

  2. Assessing and Mitigating the Effects of Windblown Soil on Rare and Common Vegetation

    Science.gov (United States)

    Gleason, Sean M.; Faucette, Dave T.; Toyofuku, Mai M.; Torres, Carlos A.; Bagley, Calvin F.

    2007-12-01

    Acting under the auspices of the US Endangered Species Act, we quantified wind erosion and its effects on rare and common plant species on a semi-arid military installation in Hawaii. Our goal was to develop management strategies, based on local data, to aid the conservation of rare and common indigenous plants and their habitats. We collected windblown soil coming off of roads and other disturbed soils to assess likely impacts to plants occurring at certain heights and distances from disturbed surfaces. We then subjected plants in a glasshouse to windblown dust treatments, designed from our field data to simulate erosion events, and evaluated the effect of these treatments on photosynthesis and survival. We also designed several field experiments to examine the in-situ effects of windblown soil and soil substrate on germination, growth rate, and survival of indigenous and nonindigenous plants. We conclude from these experiments that most direct effects of windblown soil to plants can be effectively mitigated by locating roads and training areas at least 40 m from sensitive plant habitats and through vegetation management to maintain at least 11% aerial cover on disturbed surfaces. Effects of soil type on germination, growth, and survival was species-specific, emphasizing the importance of species trials prior to, or during, rehabilitation efforts.

  3. Rare primary retroperitoneal teratoma masquerading as adrenal ...

    African Journals Online (AJOL)

    J.M. Ratkal

    investigation was found to have a right adrenal mass were collected. ... in children, but their prevalence in adults is exceedingly rare. The adrenal gland is ... tumors, the abdominal CT and chest X-ray images taken prior to surgery were.

  4. Rare earth elements in nuclear medicine

    OpenAIRE

    Kodina G.E.; Kulakov V.N.; Sheino I.N.

    2014-01-01

    The review focuses on the key applications of stable and radioactive isotopes of rare earth elements in the technology of nuclear medicine, radionuclide diagnostics and therapy, as well as magnetic resonance imaging and binary radiotherapy technologies.

  5. Rare earth elements in nuclear medicine

    Directory of Open Access Journals (Sweden)

    Kodina G.E.

    2014-12-01

    Full Text Available The review focuses on the key applications of stable and radioactive isotopes of rare earth elements in the technology of nuclear medicine, radionuclide diagnostics and therapy, as well as magnetic resonance imaging and binary radiotherapy technologies.

  6. Rare earth element mines, deposits, and occurrences

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This dataset contains location, geologic and mineral economic data for world rare earth mines, deposits, and occurrences. The data in this compilation were derived...

  7. Determinants of performance in rare strategic events

    DEFF Research Database (Denmark)

    Andersen, Kristina Vaarst; Beukel, Karin

    The paper develops and tests a theoretical framework explaining how emotions and learning affect outcomes of rare strategic events, namely Intellectual Property litigations. We investigate how organizations? negative emotions influence performance outcome in IP litigations negatively. Though...

  8. Determinants of performance in rare strategic events

    DEFF Research Database (Denmark)

    Andersen, Kristina Vaarst; Beukel, Karin

    The paper develops and tests a theoretical framework explaining how emotions and learning affect outcomes of rare strategic events, namely Intellectual Property litigations. We investigate how organizations’ negative emotions influence performance outcome in IP litigations negatively. Though...

  9. Bronchial carcinoid tumors: A rare malignant tumor

    African Journals Online (AJOL)

    2015-02-03

    Feb 3, 2015 ... Key words: Bronchial carcinoid tumor, diagnosis, outcome, treatment, West .... They can present with carcinoid syndrome, Cushing's ... 2012 reported BCT as a rare differential of pulmonary ... Management of carcinoid tumors.

  10. Functional rare males in diploid parthenogenetic Artemia.

    Science.gov (United States)

    Maccari, M; Gómez, A; Hontoria, F; Amat, F

    2013-09-01

    Functional males that are produced occasionally in some asexual taxa - called 'rare males' - raise considerable evolutionary interest, as they might be involved in the origin of new parthenogenetic lineages. Diploid parthenogenetic Artemia produce rare males, which may retain the ability to mate with females of related sexual lineages. Here, we (i) describe the frequency of male progeny in populations of diploid parthenogenetic Artemia, (ii) characterize rare males morphologically, (iii) assess their reproductive role, using cross-mating experiments with sexual females of related species from Central Asia and characterize the F1 hybrid offspring viability and (iv) confirm genetically both the identity and functionality of rare males using DNA barcoding and microsatellite loci. Our result suggests that these males may have an evolutionary role through genetic exchange with related sexual species and that diploid parthenogenetic Artemia is a good model system to investigate the evolutionary transitions between sexual species and parthenogenetic strains.

  11. Prelingual auditory verbal agnosia, A rare condition

    National Research Council Canada - National Science Library

    Violeta Necula; Cristina Mirela Stamate; Krishna Luchoo; Marcel Cosgarea

    2017-01-01

    Auditory agnosia, agnosia for speech is a rare condition, caused mostly by stroke, in adults, while in children it is often a sequel of herpes simplex encephalitis or is associated with epilepsy, in Landau–Kleffner syndrome...

  12. Rare Earth: Production, Trade and Demand

    Institute of Scientific and Technical Information of China (English)

    HONG Feng

    2007-01-01

    @@ Editor's note: The paper was quoted from the papers collection of the "19th International Workshop on Rare Earth Permanent Magnets & Their Applications", held in Beijing on August 30-Spetember 2 of 2006.

  13. Other Rare Unusual Cancers of Childhood

    Science.gov (United States)

    ... patient depends on the type of gene change. Pheochromocytoma and Paraganglioma Pheochromocytoma and paraganglioma are rare tumors that come from the same type of nerve tissue . Pheochromocytoma forms in the adrenal glands . There are two ...

  14. Therapeutics for Rare and Neglected Diseases

    Data.gov (United States)

    Federal Laboratory Consortium — There are more than 6,500 identified rare and neglected diseases, yet only about 250 treatments are available for these conditions. The limited numbers of patients...

  15. China Not the Only Rare Earth Exporter

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Since China announced it was reducing exports of rare earth,there have been continuous voices in the international community demanding China expand exports or seek alternative resources. The United States has also complained to the WTO that China is hoarding the commodity. Subjected to scathing censure,what difficulties are facing China’s rare earth industry? When other countries seek alternative resources,how is the Chinese rare earth market affected? Economy&Nation Weekly,Xinhua News Agency’s finance magazine,recently interviewed Lin Donglu,Secretary General of the Chinese Society of Rare Earths,and Wang Hongqian, General Manager of China Non-Ferrous Metal Industry’s Foreign Engineering and Construction Co.Ltd.Edited excerpts follow

  16. Characterization of Rare Events in Molecular Dynamics

    Directory of Open Access Journals (Sweden)

    Carsten Hartmann

    2013-12-01

    Full Text Available A good deal of molecular dynamics simulations aims at predicting and quantifying rare events, such as the folding of a protein or a phase transition. Simulating rare events is often prohibitive, especially if the equations of motion are high-dimensional, as is the case in molecular dynamics. Various algorithms have been proposed for efficiently computing mean first passage times, transition rates or reaction pathways. This article surveys and discusses recent developments in the field of rare event simulation and outlines a new approach that combines ideas from optimal control and statistical mechanics. The optimal control approach described in detail resembles the use of Jarzynski’s equality for free energy calculations, but with an optimized protocol that speeds up the sampling, while (theoretically giving variance-free estimators of the rare events statistics. We illustrate the new approach with two numerical examples and discuss its relation to existing methods.

  17. International Rare Histiocytic Disorders Registry (IRHDR)

    Science.gov (United States)

    2016-04-25

    Rare Histiocytic Disorders (RHDs); Juvenile Xanthogranuloma (JXG); Reticulohistiocytoma (Epithelioid Histiocytoma); Xanthoma Disseminatum (XD); Multicentric Reticulohistiocytosis (MRH); Systemic Juvenile Xanthogranuloma; Erdheim-Chester Disease (ECD); Multi-system Rosai-Dorfman Disease (RDD)

  18. Parallel Ecological Speciation in Plants?

    Directory of Open Access Journals (Sweden)

    Katherine L. Ostevik

    2012-01-01

    Full Text Available Populations that have independently evolved reproductive isolation from their ancestors while remaining reproductively cohesive have undergone parallel speciation. A specific type of parallel speciation, known as parallel ecological speciation, is one of several forms of evidence for ecology's role in speciation. In this paper we search the literature for candidate examples of parallel ecological speciation in plants. We use four explicit criteria (independence, isolation, compatibility, and selection to judge the strength of evidence for each potential case. We find that evidence for parallel ecological speciation in plants is unexpectedly scarce, especially relative to the many well-characterized systems in animals. This does not imply that ecological speciation is uncommon in plants. It only implies that evidence from parallel ecological speciation is rare. Potential explanations for the lack of convincing examples include a lack of rigorous testing and the possibility that plants are less prone to parallel ecological speciation than animals.

  19. Ciliates and the rare biosphere: a review.

    Science.gov (United States)

    Dunthorn, Micah; Stoeck, Thorsten; Clamp, John; Warren, Alan; Mahé, Frédéric

    2014-01-01

    Here we provide a brief review of the rare biosphere from the perspective of ciliates and other microbial eukaryotes. We trace research on rarity from its lack of much in-depth focus in morphological and Sanger sequencing projects, to its central importance in analyses using high throughput sequencing strategies. The problem that the rare biosphere is potentially comprised of mostly errors is then discussed in the light of asking community-comparative, novel-diversity, and ecosystem-functioning questions.

  20. 2004 Top 10 Chinese Rare Earth Events

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    1. Management to the Investment in Rare Earth IndustryConfirmedIn July 2004, "Decision on the Reform in Investment System" was formally publicized by the State Council of the People's Republic of China. The fifth item in the Decision stipulates that ore exploitation, smelting & separation and rare earth deep-processed projects with total investment over RMB¥100 million should be approved by the investment governing department of the State Council, and that other

  1. Proteus syndrome: A rare case report

    Directory of Open Access Journals (Sweden)

    Keerthi Talari

    2012-01-01

    Full Text Available Proteus syndrome (PS is a rare hamartomatous disorder characterized by various cutaneous and subcutaneous lesions, including vascular malformations, lipomas, hyperpigmentation, and several types of nevi. Partial gigantism with limb or digital overgrowth is pathognomonic of PS. We report a rare case of PS in a 50-year-old man who presented with inferior wall myocardial infarction and was incidentally detected to have hypertrophy of index and middle fingers of both the hands.

  2. The Facility for Rare Isotope Beams

    OpenAIRE

    Wrede C.

    2015-01-01

    The Facility for Rare Isotope Beams (FRIB) is a United States Department of Energy user facility currently under construction on the campus of Michigan State University. Based on a 400 kW, 200 MeV/u heavy-ion driver linac, FRIB will deliver high-quality fast, thermalized, and re-accelerated beams of rare isotopes with unprecedented intensities to a variety of experimental areas and equipment. New science opportunities at the frontiers of nuclear structure, nuclear astrophysics, fundamental sy...

  3. A rare presentation of an acute appendicitis

    Science.gov (United States)

    Kordzadeh, Ali; Lorenzi, Bruno; Kalyan, Jiten P.; Hanif, Muhammad A.; Charalabopoulos, Alexandros

    2017-01-01

    Paraumbilical hernia sac usually contains omentum, bowel loop and rarely appendicular epiploicae, metastatic deposits and vermiform appendix. Presentation of acute appendicitis in a paraumbilical hernia is rare and limited to few case reports in the literature. Herein, we would like to report a case of a successfully treated acute appendicitis presenting in a paraumbilical hernia in an 84-year-old lady with 6-month follow-up. PMID:28096326

  4. Ambras syndrome: A rare case report

    Directory of Open Access Journals (Sweden)

    A Ishita

    2016-01-01

    Full Text Available Congenital generalized hypertrichosis associated with gingival hyperplasia are rare cases published in literature. The frequency incidence of generalized congenital hypertrichosis is about one to billions of people. Hypertrichosis and gingival hyperplasia are termed as Ambras syndrome (AS, which can be noticed at birth or soon after. Here, is a rare case report of 4-year-old male child who presented with generalized hypertrichosis with gingival fibromatosis and dysmorphic facial features.

  5. Rare Z decays and neutrino flavor universality

    Energy Technology Data Exchange (ETDEWEB)

    Durieux, Gauthier [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Cornell Univ. Ithaca, NY (United States). Lab. for Elementary Particle Physics; Univ. Catholique de Louvain, Louvain-la-Neuve (Belgium). Centre for Cosmology, Particle Physics and Phenomenology; Grossman, Yuval; Kuflik, Erik [Cornell Univ. Ithaca, NY (United States). Lab. for Elementary Particle Physics; Koenig, Matthias [Mainz Univ. (Germany). PRISMA Cluster of Excellence; Mainz Univ. (Germany). Mainz Inst. for Theoretical Physics; Ray, Shamayita [Cornell Univ. Ithaca, NY (United States). Lab. for Elementary Particle Physics; Calcutta Univ. (India). Dept. of Physics

    2015-12-15

    We study rare four-body decays of the Z-boson involving at least one neutrino and one charged lepton. Large destructive interferences make these decays very sensitive to the Z couplings to neutrinos. As the identified charged leptons can determine the neutrino flavors, these decays probe the universality of the Z couplings to neutrinos. The rare four-body processes could be accurately measured at future lepton colliders, leading to percent level precision.

  6. Mastoid osteoma: Report of a rare case

    Directory of Open Access Journals (Sweden)

    Syarifah Nafisah Syed Hamzah Al-Yahya

    2015-07-01

    Full Text Available Mastoid osteoma is a rare tumour with incidence of 0.1–1% of all benign head and neck tumours. It usually presents as a slow growing, hard and painless posterior auricular swelling in which medical attention is sought most commonly on cosmetic grounds. This report discusses our finding of such a rare case that was managed in our department and from its presentation, clinical findings, differential diagnosis, and treatment aspects.

  7. 12 Ministries Control Rare Earth Exports

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    <正>"It is very natural to reserve rare earth as a strategic resource.Many countries do this,including China."On April 8,Sun Lihui,Vice Director of Metal Section of Chemicals Import & Export Commerce Chamber of China Minmetals Corporation told a reporter that as early as 2006,China has launched a strategic plan for rare earth,"but it was interrupted by the subsequent financial crisis."

  8. Measurements of charm rare decays at LHCb

    CERN Document Server

    Vacca, Claudia

    2015-01-01

    Following the intriguing hints of deviations from the Standard Model in rare B meson decays, searches for rare and forbidden decays of charm hadrons become a hot topic again. We present recent results on Flavour Changing Neutral Current $D^{0}\\rightarrow\\mu^+ \\mu^-$, $D^0 \\rightarrow\\mu^+\\mu^- \\pi^+ \\pi^-$, $D^{\\pm}_{(s)}\\rightarrow \\pi^{\\pm} \\mu^+\\mu^-$ and LFV $D^{\\pm}_{(s)}\\rightarrow \\pi^{\\mp}\\mu^{\\pm}\\mu^{\\pm}$ obtained at LHCb.

  9. Mediastinal angiomatosis: a rare case report

    OpenAIRE

    Pak, Min Gyoung; Choi, Phil Jo; Choi, Won Suk; Kang, Eun Ju; Roh, Mee Sook

    2015-01-01

    Angiomatosis refers to a rare condition of large hamartomatous vascular lesions that extensively affect a region of the body or several different tissue types in a contiguous way. Several cases have been reported in the mediastinum. We experienced a histologically proven case of mediastinal angiomatosis in a 56-year-old woman that was incidentally detected as multiple conglomerated masses mimicking metastatic lymph nodes on chest radiography. Despite its rareness, our case emphasizes that pat...

  10. Ternary rare earth-lanthanide sulfides

    Science.gov (United States)

    Takeshita, Takuo; Gschneidner, Jr., Karl A.; Beaudry, Bernard J.

    1987-01-06

    A new ternary rare earth sulfur compound having the formula: La.sub.3-x M.sub.x S.sub.4 where M is a rare earth element selected from the group europium, samarium and ytterbium and x=0.15 to 0.8. The compound has good high-temperature thermoelectric properties and exhibits long-term structural stability up to 1000.degree. C.

  11. Rare Z Decays and Neutrino Flavor Universality

    CERN Document Server

    Durieux, Gauthier; König, Matthias; Kuflik, Eric; Ray, Shamayita

    2015-01-01

    We study rare four-body decays of the Z-boson involving at least one neutrino and one charged lepton. Large destructive interferences make these decays very sensitive to the Z couplings to neutrinos. As the identified charged leptons can determine the neutrino flavors, these decays probe the universality of the Z couplings to neutrinos. The rare four-body processes could be accurately measured at future lepton colliders, leading to percent level precision.

  12. Rare thyroid non-neoplastic diseases.

    Science.gov (United States)

    Lacka, Katarzyna; Maciejewski, Adam

    2015-01-01

    Rare diseases are usually defined as entities affecting less than 1 person per 2,000. About 7,000 different rare entities are distinguished and, among them, rare diseases of the thyroid gland. Although not frequent, they can be found in the everyday practice of endocrinologists and should be considered in differential diagnosis. Rare non-neoplastic thyroid diseases will be discussed. Congenital hypothyroidism's frequency is relatively high and its early treatment is of vital importance for neonatal psychomotor development; CH is caused primarily by thyroid dysgenesis (85%) or dyshormonogenesis (10-15%), although secondary defects - hypothalamic and pituitary - can also be found; up to 40% of cases diagnosed on neonatal screening are transient. Inherited abnormalities of thyroid hormone binding proteins (TBG, TBP and albumin) include alterations in their concentration or affinity for iodothyronines, this leads to laboratory test abnormalities, although usually with normal free hormones and clinical euthyroidism. Thyroid hormone resistance is most commonly found in THRB gene mutations and more rarely in THRA mutations; in some cases both genes are unchanged (non-TR RTH). Recently the term 'reduced sensitivity to thyroid hormones' was introduced, which encompass not only iodothyronine receptor defects but also their defective transmembrane transport or metabolism. Rare causes of hyperthyroidism are: activating mutations in TSHR or GNAS genes, pituitary adenomas, differentiated thyroid cancer or gestational trophoblastic disease; congenital hyperthyroidism cases are also seen, although less frequently than CH. Like other organs and tissues, the thyroid can be affected by different inflammatory and infectious processes, including tuberculosis and sarcoidosis. In most of the rare thyroid diseases genetic factors play a key role, many of them can be classified as monogenic disorders. Although there are still some limitations, progress has been made in our understanding of

  13. Floral double mesiodentes: A rare case report.

    Science.gov (United States)

    Singaraju, Gowri Sankar; Reddy, B Rama Mohan; Supraja, G; Reddy, K Narayana

    2015-01-01

    Mesiodens is the most commonly erupting supernumerary in the midline between two maxillary central incisors. Mesiodentes is a rare condition when mesiodens erupt in multiples, which may present as either labial or palatal to permanent central incisors. We report a rare case of double mesiodentes (non-syndromic mesiodentes) with floret like appearance. The presence of mesiodens has functional and esthetic implications. Careful radiographic evaluation should be done to prevent complications during their extraction.

  14. Rare species are valued big time.

    Directory of Open Access Journals (Sweden)

    Elena Angulo

    Full Text Available BACKGROUND: It has recently been postulated that the value humans place on rarity could cause the extinction of rare species. This is because people are willing to pay the high costs of exploiting the last individuals. Many hobbies, such as ecotourism or the keeping of exotic pets may cause this effect--known as the anthropogenic Allee effect. However, the entire theory relies on the insofar undemonstrated assumption that people do value rarity. METHODOLOGY/PRINCIPAL FINDINGS: In order to quantify how much people valued rare species relative to common ones, we created online slideshows of photographs of either rare or common species on an Internet web site. The slideshow with photographs of rare species attracted more visitors, and visitors spent, in general, more time waiting to view it. CONCLUSIONS/SIGNIFICANCE: We provide evidence that people value rare more than common species. As we did not target consumers of a specific market, this finding suggests that the anthropogenic Allee effect is likely be driven by a large part of the population. Given the substantial participation in our online experiment, we highlight the potential of the world wide web resource as a tool for conservation action. However, the evidence presented here that the general public value rare species, combined with the assumption that anthropogenic Allee effect is operating, implies that conservationists should be prudent when using rarity to promote conservation.

  15. Limitation of distribution of two rare ferns in fragmented landscape

    Science.gov (United States)

    Tájek, Přemysl; Bucharová, Anna; Münzbergová, Zuzana

    2011-09-01

    Species distribution in the landscape is limited either by 1. diaspore production, dispersal and establishment abilities or 2. by availability of suitable habitats; 3. or by a combination of both factors. The relative importance of these factors is species-dependent and has mainly been studied for seed plants. We studied the importance of habitat and dispersal limitation for distribution of two rare fern species, Asplenium adulterinum and Asplenium cuneifolium, restricted to serpentine rocks, using analysis of their distribution on a regional scale (several kilometers). Within the model region, all 98 serpentine rocks were mapped. We used data on abiotic characteristics and on the presence of all vascular plant species on the rocks to predict which of the rocks were suitable for the two Asplenium species. Suitable habitats were positively defined mainly by the presence of appropriate microhabitats and the height of the highest rock, which represents the size of space with lowered concurrence. Other determinants of habitat suitability differed between species. Neither species occupied all suitable localities, indicating dispersal limitation. Locality isolation significantly affected one of the species but not the other. Overall, the results suggest that both fern species have suitable but unoccupied localities in the region and demonstrates that ferns, similar to seed plants, are limited by their dispersal ability in the landscape.

  16. [Plant hormones, plant growth regulators].

    Science.gov (United States)

    Végvári, György; Vidéki, Edina

    2014-06-29

    Plants seem to be rather defenceless, they are unable to do motion, have no nervous system or immune system unlike animals. Besides this, plants do have hormones, though these substances are produced not in glands. In view of their complexity they lagged behind animals, however, plant organisms show large scale integration in their structure and function. In higher plants, such as in animals, the intercellular communication is fulfilled through chemical messengers. These specific compounds in plants are called phytohormones, or in a wide sense, bioregulators. Even a small quantity of these endogenous organic compounds are able to regulate the operation, growth and development of higher plants, and keep the connection between cells, tissues and synergy between organs. Since they do not have nervous and immume systems, phytohormones play essential role in plants' life.

  17. Impact of plant invasions on local arthropod communities: a meta-analysis

    NARCIS (Netherlands)

    van Hengstum, T.; Hooftman, D.A.P.; Oostermeijer, J.G.B.; van Tienderen, P.H.

    2014-01-01

    1. Invasive plants can have a major impact on local plant and animal communities. However, effects of plant invasions on arthropod communities and the potential drivers have rarely been studied. 2. We present a meta-analysis of 56 studies on the impact of plant invasions on abundance and richness of

  18. Impact of plant invasions on local arthropod communities: a meta-analysis

    NARCIS (Netherlands)

    van Hengstum, T.; Hooftman, D.A.P.; Oostermeijer, J.G.B.; van Tienderen, P.H.

    2014-01-01

    1. Invasive plants can have a major impact on local plant and animal communities. However, effects of plant invasions on arthropod communities and the potential drivers have rarely been studied. 2. We present a meta-analysis of 56 studies on the impact of plant invasions on abundance and richness of

  19. Electronic plants

    Science.gov (United States)

    Stavrinidou, Eleni; Gabrielsson, Roger; Gomez, Eliot; Crispin, Xavier; Nilsson, Ove; Simon, Daniel T.; Berggren, Magnus

    2015-01-01

    The roots, stems, leaves, and vascular circuitry of higher plants are responsible for conveying the chemical signals that regulate growth and functions. From a certain perspective, these features are analogous to the contacts, interconnections, devices, and wires of discrete and integrated electronic circuits. Although many attempts have been made to augment plant function with electroactive materials, plants’ “circuitry” has never been directly merged with electronics. We report analog and digital organic electronic circuits and devices manufactured in living plants. The four key components of a circuit have been achieved using the xylem, leaves, veins, and signals of the plant as the template and integral part of the circuit elements and functions. With integrated and distributed electronics in plants, one can envisage a range of applications including precision recording and regulation of physiology, energy harvesting from photosynthesis, and alternatives to genetic modification for plant optimization. PMID:26702448

  20. Partitioning properties of rare earth ores in China

    Institute of Scientific and Technical Information of China (English)

    CHI Ru'an; LI Zhongjun; PENG Cui; ZHU Guocai; XU Shengming

    2005-01-01

    The properties of rare earth partitioning in Chinese industrial rare earth ores were analyzed. Rare earth ores can be divided into the single-mineral type ore with bastnaesite, the multi-mineral type ore with bastnaesite and monazite, and the weathering crust type. Both the Bayan Obo rare earth ore and the Zhushan rare earth ore are a kind of mixed ore, consisting of bastnaesite and monazite. Their rare earth partitionings are strongly enriched in light rare earths, where CeO2 is 50% and the light rare earth partitioning is totally over 95%. The Mianning rare earth ore as well as the Weishan rare earth is a kind of rare earth ore only having bastnaesite. Their rare earth partitionings are also strongly enriched in light rare earths,in which CeO2 is 47% and the light rare earth partitioning is totally over 94%. For the weathering crust type rare earth ore,there are the Longnan rare earth ore, the Xunwu rare earth ore, and the middle yttrium and rich europium ore. In the Longnan rare earth ore, which is strongly enriched in heavy rare earths, Y2O3 is 64.83%, and the heavy and light rare earth partitionings are 89.40% and 10.53%, respectively. In the Xunwu rare earth ore, which is strongly enriched in light rare earths, CeO2 is 47.16%, and the light rare earth partitioning is totally 93.25%. Y and Eu are enriched in the middle yttrium and rich europium ore. Its middle rare earth partitioning is totally over 10%, and Eu2O3 and Y2O3 are over 0.5% and 20%,respectively, which are mainly industrial resources of the middle and the heavy rare earths.

  1. Refined potentials for rare gas atom adsorption on rare gas and alkali-halide surfaces

    Science.gov (United States)

    Wilson, J. W.; Heinbockel, J. H.; Outlaw, R. A.

    1985-01-01

    The utilization of models of interatomic potential for physical interaction to estimate the long range attractive potential for rare gases and ions is discussed. The long range attractive force is calculated in terms of the atomic dispersion properties. A data base of atomic dispersion parameters for rare gas atoms, alkali ion, and halogen ions is applied to the study of the repulsive core; the procedure for evaluating the repulsive core of ion interactions is described. The interaction of rare gas atoms on ideal rare gas solid and alkali-halide surfaces is analyzed; zero coverage absorption potentials are derived.

  2. Separation of rare gases and chiral molecules by selective binding in porous organic cages

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Linjiang; Reiss, Paul S.; Chong, Samantha Y.; Holden, Daniel; Jelfs, Kim E.; Hasell, Tom; Little, Marc A.; Kewley, Adam; Briggs, Michael E.; Stephenson, Andrew; Thomas, K. M.; Armstrong, Jayne A.; Bell, Jon; Busto, Jose; Noel, Raymond; Liu, Jian; Strachan, Denis M.; Thallapally, Praveen K.; Cooper, Andrew I.

    2014-10-31

    Abstract: The rare gases krypton, xenon, and radon pose both an economic opportunity and a potential environmental hazard. Xenon is used in commercial lighting, medical imaging, and anesthesia, and can sell for $5,000 per kilogram. Radon, by contrast, Is naturally radioactive and the second largest cause of lung cancer, and radioactive xenon, 133Xe, was a major pollutant released In the Fukushima Daiichi Nuclear Power Plant disaster. We describe an organic cage molecule that can capture xenon and radon with unprecedented selectivity, suggesting new technologies for environmental monitoring, removal of pollutants, or the recovery of rare, valuable elements from air.

  3. [SZCZECIN CITIZENS' KNOWLEDGE ABOUT RARE DISEASES].

    Science.gov (United States)

    Walat, Anna; Skoczylas, Michal Marian; Welnicka, Agnieszka; Kulig, Malgorzata; Rodak, Przemyslaw; Walczak, Zuzanna; Jablońska, Agata

    2014-01-01

    The aim of the study was to assess knowledge about rare diseases among citizens of Szczecin (Poland). The study was performed by questioning 242 adult customers of Turzyn Shopping Centre in Szczecin (149 females and 93 males). The survey was conducted in the shopping mall on 23 February 2013 (control group) and during the celebration of Rare Disease Day and the 12th Polish Nationwide Cystic Fibrosis Week ("Dolina Mukolinków") on 2 March 2013 (research group). The research tool was a questionnaire devised by the authors and filled out by the writing authors interviewer's answers. In the study group more people knew about the existence of Rare Disease Day than in the control group (86.02% vs 57.72%, chi-square test χ2 > χ2(1); 0.001, p χ2(1); 0.001, p < 0.001). The respondents from the research group knew more about Rare Disease Day and defined the idea of it as closed in a significantly higher degree than the control group. There was no significant difference in the detailed knowledge about rare diseases in either group. This might indicate the need to educate society and patients, along with their families.

  4. Anisotropy of rare-earth magnets

    Institute of Scientific and Technical Information of China (English)

    R.Skomski; D.J.Sellmyer

    2009-01-01

    Rare-earth intermetallics such as Nd2FeI4B and Sm-Co are widely used as high-performance permanent magnets,because they combine high magnetocrystalline anisotropy with reasonable magnetization and Curie temperature.The anisotropy is a combined effect of spin-orbit coupling and electrostatic crystal-field interactions.The main contribution comes from the rare-earth 4f electrons,which are well-screened from the crystalline environment but exhibit a strong spin-orbit coupling.In this limit,the magnetocrystalline anisotropy has a very transparent physical interpretation,the anisotropy energy essentially being equal to the energy of Hund's-rules 4f ion in the crystal field.The corresponding expression for the lowest-order uniaxial anisotropy constant K1 is used to discuss rare-earth substitutions,which have recently attracted renewed interest due to shifts in the rare-earth production and demand.Specific phenomena reviewed in this article are the enhancement of the anisotropy of Sm2Fe17 due to interstitial nitrogen,the use of Sm-Co magnets for high-temperature applications,and the comparison of rare-earth single-ion anisotropy with other single-ion and two-ion mechanisms.

  5. Rare earth elements and permanent magnets (invited)

    Science.gov (United States)

    Dent, Peter C.

    2012-04-01

    Rare earth (RE) magnets have become virtually indispensible in a wide variety of industries such as aerospace, automotive, electronics, medical, and military. RE elements are essential ingredients in these high performance magnets based on intermetallic compounds RECo5, RE2TM17 (TM: transition metal), and RE2TM14B. Rare earth magnets are known for their superior magnetic properties—high induction, and coercive force. These properties arise due to the extremely high magnetocrystalline anisotropy made possible by unique 3d-4f interactions between transition metals and rare earths. For more than 40 years, these magnets remain the number one choice in applications that require high magnetic fields in extreme operating conditions—high demagnetization forces and high temperature. EEC produces and specializes in RECo5 and RE2TM17 type sintered magnets. Samarium and gadolinium are key RE ingredients in the powder metallurgical magnet production processes which include melting, crushing, jet milling, pressing, sintering, and heat treating. The magnetic properties and applications of these magnets will be discussed. We will also briefly discuss the past, current, and future of the permanent magnet business. Currently, over 95% of all pure rare earth oxides are sourced from China, which currently controls the market. We will provide insights regarding current and potential new magnet technologies and designer choices, which may mitigate rare earth supply chain issues now and into the future.

  6. Plant Behavior

    Science.gov (United States)

    Liu, Dennis W. C.

    2014-01-01

    Plants are a huge and diverse group of organisms, ranging from microscopic marine phytoplankton to enormous terrestrial trees epitomized by the giant sequoia: 300 feet tall, living 3000 years, and weighing as much as 3000 tons. For this plant issue of "CBE-Life Sciences Education," the author focuses on a botanical topic that most…

  7. Plant Behavior

    Science.gov (United States)

    Liu, Dennis W. C.

    2014-01-01

    Plants are a huge and diverse group of organisms, ranging from microscopic marine phytoplankton to enormous terrestrial trees epitomized by the giant sequoia: 300 feet tall, living 3000 years, and weighing as much as 3000 tons. For this plant issue of "CBE-Life Sciences Education," the author focuses on a botanical topic that most…

  8. Indigenous actinorhizal plants of Australia

    Indian Academy of Sciences (India)

    Nishath K Ganguli; Ivan R Kennedy

    2013-11-01

    Indigenous species of actinorhizal plants of Casuarinaceae, Elaeagnaceae and Rhamnaceae are found in specific regions of Australia. Most of these plants belong to Casuarinaceae, the dominant actinorhizal family in Australia. Many of them have significant environmental and economical value. The other two families with their indigenous actinorhizal plants have only a minor presence in Australia. Most Australian actinorhizal plants have their native range only in Australia, whereas two of these plants are also found indigenously elsewhere. The nitrogen-fixing ability of these plants varies between species. This ability needs to be investigated in some of these plants. Casuarinas form a distinctive but declining part of the Australian landscape. Their potential has rarely been applied in forestry in Australia despite their well-known uses, which are being judiciously exploited elsewhere. To remedy this oversight, a programme has been proposed for increasing and improving casuarinas that would aid in greening more regions of Australia, increasing the soil fertility and the area of wild life habitat (including endangered species). Whether these improved clones would be productive with local strains of Frankia or they need an external inoculum of Frankia should be determined and the influence of mycorrhizal fungi on these clones also should be investigated.

  9. Recovering heavy rare earth metals from magnet scrap

    Energy Technology Data Exchange (ETDEWEB)

    Ott, Ryan T.; McCallum, Ralph W.; Jones, Lawrence L.

    2017-08-08

    A method of treating rare earth metal-bearing permanent magnet scrap, waste or other material in a manner to recover the heavy rare earth metal content separately from the light rare earth metal content. The heavy rare earth metal content can be recovered either as a heavy rare earth metal-enriched iron based alloy or as a heavy rare earth metal based alloy.

  10. Progress on Study of Luminescence of Rare Earth Organic Chelates

    Institute of Scientific and Technical Information of China (English)

    杨燕生; 安保礼; 龚孟濂; 史华红; 雷衡毅; 孟建新

    2002-01-01

    Based on the investigation of the luminescence of a series of rare earth organic chelates, some relationships between luminescence and the structure of the chelates were proposed: the intensity of sensitized luminescence of central lanthanide ions(Ln3+) in a rare earth organic chelate depends on (1)the suitability of the energy gap between the excited triplet energy level of the ligands and the lowest excited energy level of Ln3+ ions; (2)the rigidity and planarity of the structure of the chelate molecule; (3)the existence of a suitable secondary ligand which may increase rigidity and the stability of the chelate molecule; and (4) the existence of a suitable π-conjugated system in the chelate molecule. According to the above relationships, 25 novel organic ligands were designed and synthesized, and their lanthanide chelates were prepared. Investigation of the photoluminescence for the new chelates shows that some of the chelates are strongly luminescent, and are applied to fluoroimmunoassay for determination of human immunoglobulin(IgG), to preparation of fluorescent plastics, and to determination of growth hormone for plants. Two novel spectroscopy-probe techniques for structure of coordination compounds and biological molecules were proposed and developed based on vibronic spectroscopy of Tb3+ complexes and fluorescence of Ce3+.

  11. Introduction prospects for rare species of flora in Crimea fur use in urban landscaping

    Directory of Open Access Journals (Sweden)

    Pidgaynaya Elena

    2016-12-01

    Full Text Available The article presents introduction prospects for rare and endangered plants of the Crimean flora. The target of research puts together types of the Crimean natural flora included to the global and regional protection documents; such plants grow in the N. V. Bagrov Botanical Garden of the Taurida Academy, V. I. Vernadsky Crimean Federal University, in Simferopol. The observations were conducted in 2010-2016. As a result of an integral assessment of plants decorative features, 34 promising and 20 highly decorative species have been marked for wide cultivation and introduction into planting of the Crimean foothill. The studied species are recommended for use in planting of various flowerbeds’ types as accent, dominant, shading, and auxiliary plants. Some 24 of the proposed types are heliophyte plants and are recommended for planting the solar sites; 10 types are suitable for half-shaded and shaded areas. In the wild, the majority of these plants are adapted to dry growing conditions; this improves their cultivation prospects in the arid areas.

  12. Plant conservation in temple yards of orissa.

    Science.gov (United States)

    Mohanty, R B; Mohapatra, B K; Padhy, S N

    1997-10-01

    This paper is a brief survey of the role of temples and holy places in nurturing the surrounding flora and its habitat. Eightysix kinds of plants in temple yards and gardens of orissa have been enlisted where they are cultivated and preserved for different temple rituals. These plants are seen rarely in wild but are saved from extinction by their association with temple rituals and ceremonies.

  13. Plant minichromosomes.

    Science.gov (United States)

    Birchler, James A; Graham, Nathaniel D; Swyers, Nathan C; Cody, Jon P; McCaw, Morgan E

    2016-02-01

    Plant minichromosomes have the potential for stacking multiple traits on a separate entity from the remainder of the genome. Transgenes carried on an independent chromosome would facilitate conferring many new properties to plants and using minichromosomes as genetic tools. The favored method for producing plant minichromosomes is telomere-mediated chromosomal truncation because the epigenetic nature of centromere function prevents using centromere sequences to confer the ability to organize a kinetochore when reintroduced into plant cells. Because haploid induction procedures are not always complete in eliminating one parental genome, chromosomes from the inducer lines are often present in plants that are otherwise haploid. This fact suggests that minichromosomes could be combined with doubled haploid breeding to transfer stacked traits more easily to multiple lines and to use minichromosomes for massive scale genome editing.

  14. Furochinoline alkaloids in plants from Rutaceae family – a review

    Directory of Open Access Journals (Sweden)

    Adamska-Szewczyk Aldona

    2016-04-01

    Full Text Available Over the past five years, phytochemical and pharmacological studies have been conducted on material extracted from members of the Rutaceae family. In such work, new furochinoline-structured alkaloids were isolated from Ruta sp. and Dictamnus sp. Beyond the aforementioned, other substances with promising activity were isolated from the less-known species of Zanthoxylum, Evodia, Lonchocarpus, Myrthopsis and Teclea. Currently used forms of extraction, as well as methods of isolation and detection, allow the obtaining of pure, biologically active compounds. Many of these have antifungal, anti-bacterial and anti-plasmodial properties. Others are still being researched as potential drugs, which, in future, may be used in treating those afflicted with HIV and cancer. This article is designed to give the readers a thorough review of the active natural products from the Rutaceae family.

  15. Nuclear Astrophysics with rare isotopes at FRIB

    Science.gov (United States)

    Schatz, Hendrik

    2011-05-01

    The Facility for Rare Isotope Beams (FRIB) currently under construction at Michigan State University will be one of the worlds’ most powerful accelerators to produce rare isotopes. These isotopes live only fractions of seconds, but their properties are imprinted onto the composition of the visible universe and the nature of stellar explosions. FRIB will produce for the first time many of the rare isotopes that are part of the rapid neutron capture process, responsible for the origin of heavy elements; it will measure reaction rates that govern stellar explosions such as supernovae, novae, and X-ray bursts; and it will produce the same exotic nuclei that form the crust of neutron stars. I will discuss how data from FRIB, together with new observational data, promise to address many open questions at the intersection of nuclear physics and astronomy, including the chemical evolution of our Galaxy, the nuclear energy sources of stellar explosions, and the nature of neutron stars.

  16. Efficient estimation of rare-event kinetics

    CERN Document Server

    Trendelkamp-Schroer, Benjamin

    2014-01-01

    The efficient calculation of rare-event kinetics in complex dynamical systems, such as the rate and pathways of ligand dissociation from a protein, is a generally unsolved problem. Markov state models can systematically integrate ensembles of short simulations and thus effectively parallelize the computational effort, but the rare events of interest still need to be spontaneously sampled in the data. Enhanced sampling approaches, such as parallel tempering or umbrella sampling, can accelerate the computation of equilibrium expectations massively - but sacrifice the ability to compute dynamical expectations. In this work we establish a principle to combine knowledge of the equilibrium distribution with kinetics from fast "downhill" relaxation trajectories using reversible Markov models. This approach is general as it does not invoke any specific dynamical model, and can provide accurate estimates of the rare event kinetics. Large gains in sampling efficiency can be achieved whenever one direction of the proces...

  17. Rare wild Orchids at CERN Meyrin

    CERN Multimedia

    2005-01-01

    There are several "Floral Nature Reserve - Late Mowing" zones at CERN Meyrin. The blossoms of a rare and a not so rare type of wild orchid are currently in flower. The rare one is the bee orchid (Ophrys Apifera) which is a protected perennial. They are very unusual and in some years can appear in great numbers and then sometimes only reappear after a decade. They live in a symbiotic relationship with a soil-dwelling fungus. Its name stems from the fact that its brown, furry lip resembles and smells like a female bee, a mimicry used to attract drones to aid in pollination. The much more distributed species is the pyramidal orchid (Anacamptis Pyramidalis), which due to its size and its bright pink colour is already visible when you pass by in your car.

  18. Rare wild Orchids at CERN Meyrin

    CERN Multimedia

    2005-01-01

    There are several "Floral Nature Reserve - Late Mowing" zones at CERN Meyrin. The blossoms of a rare and a not so rare type of wild orchid are currently in flower. The rare one is the bee orchid (Ophrys Apifera) which is a protected perennial. They are very unusual and in some years can appear in great numbers and then sometimes only reappear after a decade. They live in a symbiotic relationship with a soil-dwelling fungus. Its name stems from the fact that its brown, furry lip resembles and smells like a female bee, a mimicry used to attract drones to aid in pollination. The much more distributed species is the pyramidal orchid (Anacamptis Pyramidalis), which due to its size and its bright pink colour is already visible when you pass by in your car. Photos were taken on the late mowing zone adjacent to route Einstein opposite building 57 on 4 June 2005.

  19. An Erupted Dilated Odontoma: A Rare Presentation

    Directory of Open Access Journals (Sweden)

    Gaurav Sharma

    2016-01-01

    Full Text Available A dilated odontoma is an extremely rare developmental anomaly represented as a dilatation of the crown and root as a consequence of a deep, enamel-lined invagination and is considered a severe variant of dens invaginatus. An oval shape of the tooth lacking morphological characteristics of a crown or root implies that the invagination happened in the initial stages of morphodifferentiation. Spontaneous eruption of an odontoma is a rare occurrence and the occurrence of a dilated odontoma in a supernumerary tooth is even rarer with only a few case reports documented in the English literature. We present an extremely rare case of erupted dilated odontoma occurring in the supernumerary tooth in anterior maxillary region in an 18-year-old male, which, to the best of our knowledge, is the first ever case reported in English literature.

  20. An Erupted Dilated Odontoma: A Rare Presentation

    Science.gov (United States)

    Sharma, Gaurav; Nagra, Amritpreet; Singh, Gurkeerat; Nagpal, Archna; Soin, Atul; Bhardwaj, Vishal

    2016-01-01

    A dilated odontoma is an extremely rare developmental anomaly represented as a dilatation of the crown and root as a consequence of a deep, enamel-lined invagination and is considered a severe variant of dens invaginatus. An oval shape of the tooth lacking morphological characteristics of a crown or root implies that the invagination happened in the initial stages of morphodifferentiation. Spontaneous eruption of an odontoma is a rare occurrence and the occurrence of a dilated odontoma in a supernumerary tooth is even rarer with only a few case reports documented in the English literature. We present an extremely rare case of erupted dilated odontoma occurring in the supernumerary tooth in anterior maxillary region in an 18-year-old male, which, to the best of our knowledge, is the first ever case reported in English literature. PMID:26989523

  1. An Erupted Dilated Odontoma: A Rare Presentation.

    Science.gov (United States)

    Sharma, Gaurav; Nagra, Amritpreet; Singh, Gurkeerat; Nagpal, Archna; Soin, Atul; Bhardwaj, Vishal

    2016-01-01

    A dilated odontoma is an extremely rare developmental anomaly represented as a dilatation of the crown and root as a consequence of a deep, enamel-lined invagination and is considered a severe variant of dens invaginatus. An oval shape of the tooth lacking morphological characteristics of a crown or root implies that the invagination happened in the initial stages of morphodifferentiation. Spontaneous eruption of an odontoma is a rare occurrence and the occurrence of a dilated odontoma in a supernumerary tooth is even rarer with only a few case reports documented in the English literature. We present an extremely rare case of erupted dilated odontoma occurring in the supernumerary tooth in anterior maxillary region in an 18-year-old male, which, to the best of our knowledge, is the first ever case reported in English literature.

  2. Collaboration for rare disease drug discovery research

    Science.gov (United States)

    Litterman, Nadia K.; Rhee, Michele; Swinney, David C.; Ekins, Sean

    2014-01-01

    Rare disease research has reached a tipping point, with the confluence of scientific and technologic developments that if appropriately harnessed, could lead to key breakthroughs and treatments for this set of devastating disorders. Industry-wide trends have revealed that the traditional drug discovery research and development (R&D) model is no longer viable, and drug companies are evolving their approach. Rather than only pursue blockbuster therapeutics for heterogeneous, common diseases, drug companies have increasingly begun to shift their focus to rare diseases. In academia, advances in genetics analyses and disease mechanisms have allowed scientific understanding to mature, but the lack of funding and translational capability severely limits the rare disease research that leads to clinical trials. Simultaneously, there is a movement towards increased research collaboration, more data sharing, and heightened engagement and active involvement by patients, advocates, and foundations. The growth in networks and social networking tools presents an opportunity to help reach other patients but also find researchers and build collaborations. The growth of collaborative software that can enable researchers to share their data could also enable rare disease patients and foundations to manage their portfolio of funded projects for developing new therapeutics and suggest drug repurposing opportunities. Still there are many thousands of diseases without treatments and with only fragmented research efforts. We will describe some recent progress in several rare diseases used as examples and propose how collaborations could be facilitated. We propose that the development of a center of excellence that integrates and shares informatics resources for rare diseases sponsored by all of the stakeholders would help foster these initiatives. PMID:25685324

  3. Collaboration for rare disease drug discovery research.

    Science.gov (United States)

    Litterman, Nadia K; Rhee, Michele; Swinney, David C; Ekins, Sean

    2014-01-01

    Rare disease research has reached a tipping point, with the confluence of scientific and technologic developments that if appropriately harnessed, could lead to key breakthroughs and treatments for this set of devastating disorders. Industry-wide trends have revealed that the traditional drug discovery research and development (R&D) model is no longer viable, and drug companies are evolving their approach. Rather than only pursue blockbuster therapeutics for heterogeneous, common diseases, drug companies have increasingly begun to shift their focus to rare diseases. In academia, advances in genetics analyses and disease mechanisms have allowed scientific understanding to mature, but the lack of funding and translational capability severely limits the rare disease research that leads to clinical trials. Simultaneously, there is a movement towards increased research collaboration, more data sharing, and heightened engagement and active involvement by patients, advocates, and foundations. The growth in networks and social networking tools presents an opportunity to help reach other patients but also find researchers and build collaborations. The growth of collaborative software that can enable researchers to share their data could also enable rare disease patients and foundations to manage their portfolio of funded projects for developing new therapeutics and suggest drug repurposing opportunities. Still there are many thousands of diseases without treatments and with only fragmented research efforts. We will describe some recent progress in several rare diseases used as examples and propose how collaborations could be facilitated. We propose that the development of a center of excellence that integrates and shares informatics resources for rare diseases sponsored by all of the stakeholders would help foster these initiatives.

  4. A Rare Cause of Hypopituitarism: Pituitary Tuberculosis

    Directory of Open Access Journals (Sweden)

    Şazi İmamoğlu

    2012-03-01

    Full Text Available Pituitary tuberculosis is a rare condition that can present with hypopituitarism even without any evidence of systemic tuberculosis and is easily confused with pituitary adenomas. Headache and hypopituitarism are the most common presenting symptoms. We report the case of pituitary tuberculosis in a 39-year-old male patient who presented with panhypopituitarism. Although it is rare and difficult to diagnose, pituitary tuberculosis should be considered in every nonfunctional sellar masses, especially in fairly small ones with unexpected hypopituitarism. Turk Jem 2012; 16: 26-8

  5. Odontoameloblastoma: A rare case with unusual presentation

    Directory of Open Access Journals (Sweden)

    Supreet Jain

    2016-01-01

    Full Text Available The odontoameloblastoma (OA, also known as ameloblastic odontoma, is a very rare odontogenic tumor that is similar to ameloblastoma in its locally aggressive behavior. OA includes odontogenic ectomesenchyme in addition to odontogenic epithelium that resembles an ameloblastoma both in structure and in behavior. Its clinical presentation, however, often mimics the more innocuous odontoma, and hence, the recognition of its aggressive nature is commonly only ascertained after its histopathologic diagnosis following enucleation. This paper presents a rare case of OA with unusual clinical and radiological features.

  6. A rare case of isolated female epispadias

    Directory of Open Access Journals (Sweden)

    Charu Tiwari

    2016-09-01

    Full Text Available Isolated female epispadias without bladder exstrophy is an extremely rare entity. It usually presents with primary urinary incontinence and abnormal external genitalia. We describe this rare congenital anomaly in a 7-year-old girl who presented with urinary incontinence and abnormal external genitalia. She had a bifid clitoris and labia minora were widely separated. The vagina was normal. Voiding Cysto-urethrography (VCUG showed small capacity bladder with no reflux. Surgical reconstruction of the urethra, labia minora and clitoris was performed.

  7. Meningeal fibroma: a rare meningioma mimic.

    Science.gov (United States)

    Kakkar, Aanchal; Sharma, Mehar C; Goyal, Nishant; Sarkar, Chitra; Suri, Vaishali; Garg, Ajay; Kale, Shashank S; Suri, Ashish

    2014-08-01

    Meningeal fibromas are rare intracranial tumors that mimic meningiomas radiologically as well as histologically. The authors report 2 cases of meningeal fibroma with detailed clinical, radiological, histopathological, and immunohistochemical features, and discuss the differential diagnosis of this entity. Knowledge of this rare tumor is essential for pathologists to be able distinguish it from more common meningeal tumors, especially in younger patients. This knowledge is also essential for neurosurgeons, as incomplete resection may lead to tumor recurrence, and such patients require close follow-up.

  8. Xanthogranulomatous Prostatitis, a Rare Prostatic Entity

    Directory of Open Access Journals (Sweden)

    Alejandro Noyola

    2017-01-01

    Full Text Available There are several benign prostatic pathologies that can clinically mimic a prostate adenocarcinoma. Xanthogranulomatous prostatitis is a benign inflammatory condition of the prostate and a rare entity. A 47-year old male, with 3 years of lower urinary tract symptoms, with a palpable hypogastric tumor, digital rectal examination: solid prostate, of approximately 60 g. Initial PSA was 0.90 ng/mL. He underwent surgical excision of the lower abdominal nodule and prostatectomy. Histopathology showed xanthogranulomatous prostatitis, without malignancy. Xanthogranulomatous prostatitis is an extremely rare entity that can simulate prostate adenocarcinoma, therefore having a correct histopathological diagnosis is essential.

  9. Xanthogranulomatous Prostatitis, a Rare Prostatic Entity.

    Science.gov (United States)

    Noyola, Alejandro; Gil, José Fernando; Lujano, Heriberto; Piñon, Omar; Muñoz, Gabriel; Michel, José Manuel; Garcia, Jorge; Valdez, Jorge; Morales, Omar

    2017-01-01

    There are several benign prostatic pathologies that can clinically mimic a prostate adenocarcinoma. Xanthogranulomatous prostatitis is a benign inflammatory condition of the prostate and a rare entity. A 47-year old male, with 3 years of lower urinary tract symptoms, with a palpable hypogastric tumor, digital rectal examination: solid prostate, of approximately 60 g. Initial PSA was 0.90 ng/mL. He underwent surgical excision of the lower abdominal nodule and prostatectomy. Histopathology showed xanthogranulomatous prostatitis, without malignancy. Xanthogranulomatous prostatitis is an extremely rare entity that can simulate prostate adenocarcinoma, therefore having a correct histopathological diagnosis is essential.

  10. Neurothekeoma of petrous apex: A rare entity

    Directory of Open Access Journals (Sweden)

    Zarina Abdul Assis

    2013-01-01

    Full Text Available Intraosseous nerve sheath tumors are very rare tumors accounting for lesser than 0.2% of primary bone tumors. We present an 18-year-old female who presented with left facial paresis for the last 1 year. Magnetic resonance imaging (MRI demonstrated expansile, multiseptated, enhancing bony lesion in the left petrous apex. There was also abnormal enhancement of the 7-8 th nerve complex within the internal auditory canal. Tumor was excised by subtemporal extradural approach. The lesion was diagnosed as intraosseous neurothekeoma on histopathology. This is an extremely rare tumor and its MRI appearance in this location is being described for the first time in literature.

  11. Forward flux sampling for rare event simulations.

    Science.gov (United States)

    Allen, Rosalind J; Valeriani, Chantal; Rein Ten Wolde, Pieter

    2009-11-18

    Rare events are ubiquitous in many different fields, yet they are notoriously difficult to simulate because few, if any, events are observed in a conventional simulation run. Over the past several decades, specialized simulation methods have been developed to overcome this problem. We review one recently developed class of such methods, known as forward flux sampling. Forward flux sampling uses a series of interfaces between the initial and final states to calculate rate constants and generate transition paths for rare events in equilibrium or nonequilibrium systems with stochastic dynamics. This review draws together a number of recent advances, summarizes several applications of the method and highlights challenges that remain to be overcome.

  12. Glomus tumor of penis- A rare case

    Directory of Open Access Journals (Sweden)

    Madhuri S. Kate

    2013-01-01

    Full Text Available Glomus tumors are rare, painful, and benign soft tissue tumors of the skin arising from the glomus body, an arteriovenous thermoregulatory structure. This lesion is usually found on the extremities. Glomus tumor involving the external genital organs including penis is extremely rare. Until now, only few cases have been reported in the available literature. A 22 year old male patient presented with a painful nodule over the penis. The pathologic diagnosis was glomus tumor of the glans penis. We report herewith a case of glomus tumor of penis diagnosed on histopathologic examination. Glomus tumor, being a benign neoplasm, complete extirpation of the glomus tumor is the treatment of choice.

  13. Searches for rare charm decays at LHCb

    CERN Document Server

    Mitzel, Dominik Stefan

    2017-01-01

    Rare and forbidden charm decays are unique probes for hints of physics beyond the Standard Model. The LHCb collaboration has made significant contributions to the field over the last years. This report presents results of the search for the lepton-flavour violating decay $D^0 \\to e^\\pm \\mu^\\mp$ and the first observations of the rare four body decays $D^0 \\to K^- \\pi^+ \\mu^+ \\mu^-, D^0 \\to \\pi^+ \\pi^- \\mu^+ \\mu^-$ ans $D^0 \\to K^+ K^- \\mu^+ \\mu^-$.

  14. Replacing the Rare Earth Intellectual Capital

    Energy Technology Data Exchange (ETDEWEB)

    Gschneidner, Jr., Karl

    2011-04-01

    The rare earth crisis slowly evolved during a 10 to 15 year period beginning in the mid-1980s, when the Chinese began to export mixed rare earth concentrates. In the early 1990s, they started to move up the supply chain and began to export the individual rare earth oxides and metals. By the late 1990s the Chinese exported higher value products, such as magnets, phosphors, polishing compounds, catalysts; and in the 21st century they supplied finished products including electric motors, computers, batteries, liquid-crystal displays (LCDs), TVs and monitors, mobile phones, iPods and compact fluorescent lamp (CFL) light bulbs. As they moved to higher value products, the Chinese slowly drove the various industrial producers and commercial enterprises in the US, Europe and Japan out of business by manipulating the rare earth commodity prices. Because of this, the technically trained rare earth engineers and scientists who worked in areas from mining to separations, to processing to production, to manufacturing of semifinished and final products, were laid-off and moved to other fields or they retired. However, in the past year the Chinese have changed their philosophy of the 1970s and 1980s of forming a rare earth cartel to control the rare earth markets to one in which they will no longer supply the rest of the world (ROW) with their precious rare earths, but instead will use them internally to meet the growing demand as the Chinese standard of living increases. To this end, they have implemented and occasionally increased export restrictions and added an export tariff on many of the high demand rare earth elements. Now the ROW is quickly trying to start up rare earth mines, e.g. Molycorp Minerals in the US and Lynas Corp. in Australia, to cover this shortfall in the worldwide market, but it will take about five years for the supply to meet the demand, even as other mines in the ROW become productive. Unfortunately, today there is a serious lack of technically trained

  15. Endangered Plants in Oregon and Washington.

    Science.gov (United States)

    Love, Rhoda M.

    1985-01-01

    Presents a partial list of the 132 Oregon and Washington plants which have been proposed for federal protection under the Endangered Species Act. Suggestions for student/citizen involvement in preserving these species and a description of a videotape about rare/endangered species of the Willamette Valley (Oregon) are included. (DH)

  16. Fetus in fetu: A very rare anomaly

    Directory of Open Access Journals (Sweden)

    Sanjay Choudhuri

    2014-11-01

    Full Text Available “Fetus in fetu” is a condition seen rarely in the literature, less than 200 cases reported till now. It is a calcified mass or an encapsulated pendunculated tumor thought to be due to unequal division of totipotent cells of a blastocyst, resulting in a small cellular mass in a more mature embryo thus forming a monozygotic, diamniotic twin pregnancy.

  17. Aging in Rare Intellectual Disability Syndromes

    Science.gov (United States)

    Dykens, Elisabeth M.

    2013-01-01

    This review highlights several methodological challenges involved in research on aging, health, and mortality in adults with rare intellectual disability syndromes. Few studies have been performed in this area, with research obstacles that include: the ascertainment of older adults with genetic versus clinical diagnoses; likelihood that adults…

  18. 75 FR 47458 - TRICARE; Rare Diseases Definition

    Science.gov (United States)

    2010-08-06

    ... of Health and Food and Drug Administration definitions when making coverage decisions for treatments... Office of the Secretary 32 CFR Part 199 RIN 0720-AB26 TRICARE; Rare Diseases Definition AGENCY: Office of the Secretary, DoD. ACTION: Final rule. SUMMARY: This final rule revises the definition of...

  19. Focal dermal hypoplasia: A rare case report

    Directory of Open Access Journals (Sweden)

    Sahana M Srinivas

    2015-01-01

    Full Text Available Focal dermal hypoplasia (Goltz syndrome is a rare genetic multisystem disorder primarily involving the skin, skeletal system, eyes, and face. We report the case of an eight-month-old female child who presented with multiple hypopigmented atrophic macules along the lines of blaschko, skeletal anomalies, umbilical hernia, developmental delay, hypoplastic nails, syndactyly, and lobster claw deformity characteristic of Goltz syndrome.

  20. Sporotrichoid lupus vulgaris: A rare presentation.

    Science.gov (United States)

    Maheshwari, Anshul; Tiwari, Siddhi; Mathur, Deepak K; Bhargava, Puneet

    2015-01-01

    Lupus vulgaris is the most common presentation of cutaneous tuberculosis in India and can present as papular, nodular, plaque, ulcerative, vegetating, and tumid forms. Unusual variants include the frambesiform, gangrenous, ulcerovegetating, lichen simplex chronicus, myxomatous, and sporotrichoid types. We describe a rare sporotrichoid presentation of lupus vulgaris on the leg of a 28-year-old female of 12 years duration.

  1. China Not the Only Rare Earth Exporter

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    @@ Since China announced it was reducing exports of rare earth,there have been continuous voices in the international community demanding China expand exports or seek alternative resources.The United States has also complained to the WTO that China is hoarding the commodity.

  2. Pneumothorax: A rare presentation of pulmonary mycetoma

    Directory of Open Access Journals (Sweden)

    Gupta Prem

    2007-01-01

    Full Text Available Pneumothorax due to mycetoma is extremely rare and has been described only in patients undergoing intensive cytotoxic therapy for hematologic malignancies. A non-immunocompromised subject presenting with pneumothorax due to rupture of the mycetoma into the pleural cavity is being described here.

  3. Spread of Rare Fungus from Vancouver Island

    Centers for Disease Control (CDC) Podcasts

    2006-12-20

    Cryptococcus gattii, a rare fungus normally found in the tropics, has infected people and animals on Vancouver Island, Canada. Dr. David Warnock, Director, Division of Foodborne, Bacterial, and Mycotic Diseases, CDC, discusses public health concerns about further spread of this organism.  Created: 12/20/2006 by Emerging Infectious Diseases.   Date Released: 12/29/2006.

  4. Non-rare earth magnetic nanoparticles

    Energy Technology Data Exchange (ETDEWEB)

    Carpenter, Everett E.; Huba, Zachary J.; Carroll, Kyler J.; Farghaly, Ahmed; Khanna, Shiv N.; Qian, Meichun; Bertino, Massimo

    2017-09-26

    Continuous flow synthetic methods are used to make single phase magnetic metal alloy nanoparticles that do not contain rare earth metals. Soft and hard magnets made from the magnetic nanoparticles are used for a variety of purposes, e.g. in electric motors, communication devices, etc.

  5. Fern Habitats and Rare Ferns in Oklahoma

    Directory of Open Access Journals (Sweden)

    Bruce A. Smith

    2008-12-01

    Full Text Available This paper features some of the more common fern habitats in Oklahoma and provides information on four rare Oklahoma ferns from two fern families: Aspleniaceae and Pteridaceae. Surprisingly, ferns can be found in a variety of habitats across Oklahoma.

  6. A rare cause of Cushing's syndrome

    DEFF Research Database (Denmark)

    Folkestad, Lars; Andersen, Marianne Skovsager; Nielsen, Anne Lerberg;

    2014-01-01

    Excess glucocorticoid levels cause Cushing's syndrome (CS) and may be due to pituitary, adrenal or ectopic tumours. Adrenocorticotropic hormone (ACTH) levels are useful in identifying adrenal tumours. In rare cases, ACTH-producing phaeochromocytomas are the cause of CS. We present two cases of ACTH...

  7. A RARE CASE OF ACARDIAC TWIN

    OpenAIRE

    Padmaja; Nirmala,

    2015-01-01

    Fetus Acardiacus is a very rare manifestation of twin gestation . This happens due to TRAP sequence . That is Twin reversed arterial perfusion . In this case an amorphous mass was seen on a routine antenatal scan and followed as there was a live twin also . The case report highlights the importance of careful scanning and ...

  8. CEMARA an information system for rare diseases.

    Science.gov (United States)

    Landais, Paul; Messiaen, Claude; Rath, Ana; Le Mignot, Loïc; Dufour, Eric; Ben Said, Mohamed; Jais, Jean-Philippe; Toubiana, Laurent; Baujat, Geneviève; Bourdon-Lanoy, Eva; Gérard-Blanluet, Marion; Bodemer, Christine; Salomon, Rémi; Aymé, Ségolène; Le Merrer, Martine; Verloes, Alain

    2010-01-01

    Rare diseases cover a group of conditions characterized by a low prevalence, affecting less than 1 in 2,000 people; 5000 to 7000 rare diseases have been currently identified in Europe. Most diseases do not have any curative treatment. They represent thus an important public health concern. CEMARA is based on a n-tier architecture. Its main objective is to collect continuous and complete records of patients with rare diseases, and their follow-up through a web-based Information System, and to analyse the epidemiological patterns. In France, 41 out of 131 labelled Reference Centres (RC) are sharing CEMARA. Presently 56,593 cases have been registered by more than 850 health care professionals belonging to 171 clinical sites. The national demand of care was explored in relation with the offer of care in order to reach an improved match. Within 2 years, CEMARA stimulated sharing a common platform, a common ontology with Orphanet and initiating new cohorts of rare diseases for improving patient care and research.

  9. Anterior urethral diverticulum: A rare presentation

    Directory of Open Access Journals (Sweden)

    Annavarupu Gopalkrishna

    2016-01-01

    Full Text Available Congenital anomalies of the urogenital tract are the most common anomalies found in the foetus, neonates and infants, but anterior urethral valves and diverticula are rare. Here, we present a case with congenital anterior urethral diverticulum associated with patent ductus arteriosus and polydactyly.

  10. Teratoid Wilms′ tumor - A rare renal tumor

    Directory of Open Access Journals (Sweden)

    Biswanath Mukhopadhyay

    2011-01-01

    Full Text Available Teratoid Wilms′ tumor is an extremely rare renal tumor. We report a case of unilateral teratoid Wilms′ tumor in a 4-year-old girl. The patient was admitted with a right-sided abdominal mass. The mass was arising from the right kidney. Radical nephrectomy was done and the patient had an uneventful recovery. Histopathology report showed teratoid Wilms′ tumor.

  11. Clitoral choristoma: A rare case report

    Directory of Open Access Journals (Sweden)

    Jayalaxmi Shripati Aihole

    2017-01-01

    Full Text Available Clitoral hypertrophy is usually seen as a congenital malformation, specifically during the stages of hormonal expressions in the disorders of sexual development. Acquired clitoral hypertrophy is a relatively rare condition. Clitoris can be the site of neoplastic lesions. Clitoral choristoma has not been reported so far in the literature.

  12. PERITONEAL MALIGNANT MESOTHELIOMA : A RARE CASE REPORT

    Directory of Open Access Journals (Sweden)

    Dhamotharan

    2015-08-01

    Full Text Available INTRODUCTION : Peritoneal mesothelioma is a rare tumor, presenting difficulties in diagnosis and treatment. Peritoneum is the second most common area of the mesothelioma after pleura, and even synchronous pleural and peritoneal mesotheliomas are observed in 30 – 45% of all cases. The diagnosis may be difficult due to lack of specific symptoms and clinical findings. In addition, a delay in the diagnosis is not rare especially in the absence of previous asbestos exposure. Here we report a case of malignant peritoneal mesothelioma. The diagnostic and therapeutic approaches for these rare neoplasms are discussed. CASE PRESENTATION : Prolonged a bdominal pain and abdominal distension were the primary presentation symptoms and findings. A mass noted after imaging studies in the right lower quadrant of abdomen. Diagnostic lap a roscopy and sampling done from the mesenteric node. Final diagnosis were p ossible with histological and immunohistochemical documentation of tumor characteristics, which were consistent with dictating a mesothelial origin. No history of asbestos exposure was reported. CONCLUSION : Peritoneal mesotheliomas are rare clinical entiti es. However, patients with prolonged abdominal pain and abdominal masses should be considered to have atypical pathologies such as peritoneal mesotheliomas

  13. [A woman with a rare vascular malformation

    NARCIS (Netherlands)

    Koning, G.G.; Vries, M. de

    2015-01-01

    A 30-year-old woman with trisomy 8 syndrome and coagulopathy was diagnosed with a malformation of the vena cava superior. This is a rare anatomical variation, which originates from a non-development of Marshall's ligament during the 8th week of gestation (prevalence: 0.3%).

  14. Rare B Decays at BaBar

    Energy Technology Data Exchange (ETDEWEB)

    Datta, M

    2005-03-14

    The authors present recent results on rare B meson decays based on data taken by the BABAR detector at the PEP-II asymmetric e{sup +}e{sup -} collider. Included in this report are measurements of branching fractions and other quantities of interest for several hadronic, radiative, electroweak, and purely leptonic decays of B mesons.

  15. Rare prenylated flavonoids from Tephrosia purpurea.

    Science.gov (United States)

    Hegazy, Mohamed-Elamir F; Abd el-Razek, Mohamed H; Nagashima, Fumihiro; Asakawa, Yoshinori; Paré, Paul W

    2009-01-01

    Chemical investigations of aerial parts of Tephrosia purpurea yielded the rare prenylated flavonoids, tephropurpulin A (1) and isoglabratephrin (2), in addition to a previously identified flavonoid, glabratephrin (3). Structures were established by 1D and 2D NMR spectroscopy, as well as by HR-MS analysis; for compounds 2 and 3, structures were confirmed by X-ray analysis.

  16. [Inverted papiloma and its rare forms].

    Science.gov (United States)

    Bugová, G; Jeseňák, M; Wallenfels, P; Ondrušová, B; Hajtman, A

    2014-01-01

    Authors address the issue of a frequent benign tumour of the nasal cavity and paranasal sinuses -  inverted papilloma. They analyse the available diagnostic methods and treatment options. On the background of selected case reports of a rare malignant transformation they emphasize the need for longterm dispensarization as a part of management plan for patients with this oncological disease.

  17. Megaloblastic anemia--a rare cause.

    Science.gov (United States)

    Debnath, Sanjib Kr; Aggarwal, Anju; Mittal, Hema

    2011-10-01

    A 2- year- old boy presented with non responsive megaloblastic anemia, growth failure and developmental delay. Blood levels of B(12), folic acid and iron were normal. Tandem mass spectroscopy for common inborn errors of metabolism did not reveal any abnormality. There was an increased excretion of orotic acid in urine. The authors report this as a rare cause of megaloblastic anemia.

  18. Aging in Rare Intellectual Disability Syndromes

    Science.gov (United States)

    Dykens, Elisabeth M.

    2013-01-01

    This review highlights several methodological challenges involved in research on aging, health, and mortality in adults with rare intellectual disability syndromes. Few studies have been performed in this area, with research obstacles that include: the ascertainment of older adults with genetic versus clinical diagnoses; likelihood that adults…

  19. Popliteal Pterygium Syndrome: A Rare Entity

    Directory of Open Access Journals (Sweden)

    Muhammad Qasim

    2012-02-01

    Full Text Available The popliteal pterygium syndrome is a congenital malformation that includes orofacial, musculoskeletal and genitourinary anomalies. It is a rare autosomal dominant disorder. We report one family with popliteal pterygium syndrome affecting father and his two daughters, who underwent surgical corrections for multiple congenital malformations.

  20. Imaging in the diagnosis of rare diseases.

    Science.gov (United States)

    Bekiesińska-Figatowska, Monika

    2015-01-01

    A disease is considered rare if it affects no more than 5 in 10,000 people. More than six thousand rare diseases have been detected so far and they affect 6-8% of the population which equals 2.3-3 million people in Poland. Some of the rare diseases are already diagnosed in utero, e.g. skeletal dysplasias on ultrasonography or central nervous system diseases on magnetic resonance imaging (MRI). Many cases are finally diagnosed after radiologist's suggestion in a radiological report. Although diagnostic imaging cannot be considered as a basis for diagnosis of most of rare diseases, these studies represent an important element in the diagnostic chain. The complicated and long process of diagnosis may be significantly shortened by suggestions of the radiologist, based on the observation of these elements of radiological appearance of the lesions that are characteristic for a particular group of diseases, or even for a particular disease entity. However, the absolute condition for success is the close clinical-radiological cooperation, with clinicians providing the radiologists with their knowledge of patient's history, clinical manifestations, and the results of other investigations.

  1. Enamel renal syndrome: A rare case report

    Directory of Open Access Journals (Sweden)

    S V Kala Vani

    2012-01-01

    Full Text Available Enamel renal syndrome is a very rare disorder associating amelogenesis imperfecta with nephrocalcinosis. It is known by various synonyms such as amelogenesis imperfecta nephrocalcinosis syndrome, MacGibbon syndrome, Lubinsky syndrome, and Lubinsky-MacGibbon syndrome. It is characterized by enamel agenesis and medullary nephrocalcinosis. This paper describes enamel renal syndrome in a female patient born in a consanguineous family.

  2. Intrauterine perineal tear: a rare birth injury.

    Science.gov (United States)

    Bhat, B V; Jagdish, S; Srinivasan, S; Pandey, K K; Chatterjee, H

    1992-12-01

    A rare case of birth injury having intrauterine complete perineal tear is presented. Defunctioning sigmoid colostomy was undertaken because of bad perineal condition. The baby died of Pseudomonas septicemia on the 15th day before definitive surgical procedure could be undertaken.

  3. [Meckel Gruber syndrome: about a rare case].

    Science.gov (United States)

    Itchimouh, Sanaa; Khabtou, Karima; Mahdaoui, Sakher; Boufettal, Houssine; Samouh, Naima

    2016-01-01

    Meckel Gruber syndrome is a rare autosomal recessive polymalformation syndrome characterized by occipital encephalocele, polydactyly and cystic renal dysplasia. Ultrasound is, at present, the best tool for prenatal screening of this lethal polymalformation and diagnosys is confirmed by karyotyping. We here report a case of Meckel Gruber syndrome detected by ultrasound. Abortion was performed at 25 weeks of amenorrhoea.

  4. A rare case of bile duct cyst

    Institute of Scientific and Technical Information of China (English)

    Qing-Gang Wang; Shu-Tian Zhang

    2009-01-01

    Choledochal cyst is an uncommon disease usually seen in young women and can be divided into five types. We report a 66-year-old woman who was diagnosed with types Ⅱ and Ⅱ bile duct cyst simultaneously after surgery, which is a rare type of bile duct cyst.

  5. Effects of Simulated Rare Earth Recycling Wastewaters on Biological Nitrification.

    Science.gov (United States)

    Fujita, Yoshiko; Barnes, Joni; Eslamimanesh, Ali; Lencka, Malgorzata M; Anderko, Andrzej; Riman, Richard E; Navrotsky, Alexandra

    2015-08-18

    Increasing rare earth element (REE) supplies by recycling and expanded ore processing will result in generation of new wastewaters. In some cases, disposal to a sewage treatment plant may be favored, but plant performance must be maintained. To assess the potential effects of such wastewaters on biological treatment, model nitrifying organisms Nitrosomonas europaea and Nitrobacter winogradskyi were exposed to simulated wastewaters containing varying levels of yttrium or europium (10, 50, and 100 ppm), and the extractant tributyl phosphate (TBP, at 0.1 g/L). Y and Eu additions at 50 and 100 ppm inhibited N. europaea, even when virtually all of the REE was insoluble. Provision of TBP with Eu increased N. europaea inhibition, although TBP alone did not substantially alter activity. For N. winogradskyi cultures, Eu or Y additions at all tested levels induced significant inhibition, and nitrification shut down completely with TBP addition. REE solubility was calculated using the previously developed MSE (Mixed-Solvent Electrolyte) thermodynamic model. The model calculations reveal a strong pH dependence of solubility, typically controlled by the precipitation of REE hydroxides but also likely affected by the formation of unknown phosphate phases, which determined aqueous concentrations experienced by the microorganisms.

  6. Plant Macrofossils

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Records of past vegetation and environmental change derived from plant remains large enough to be seen without a microscope (macrofossils), such as leaves, needles,...

  7. Seed planting

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report summarizes prairie seed plantings on Neal Smith National Wildlife Refuge (formerly Walnut Creek National Wildlife Refuge) between 1992 and 2009.

  8. T Plant

    Data.gov (United States)

    Federal Laboratory Consortium — Arguably the second most historic building at Hanford is the T Plant.This facility is historic in that it's the oldest remaining nuclear facility in the country that...

  9. TRANSGENIC PLANTS

    African Journals Online (AJOL)

    MANAGEMENT OF INSECT PEST RESISTANCE WHILE USING ... Stratégies to delay the development of résistance while using Bt engineered plants are many and would need to be ..... training, pesticide use patterns change, and the.

  10. Peripheral neuropathy: the importance of rare subtypes

    Science.gov (United States)

    Callaghan, Brian C.; Price, Ray S.; Chen, Kevin S.; Feldman, Eva L.

    2016-01-01

    Importance Peripheral neuropathy is a prevalent condition that usually warrants a thorough history and examination, but limited diagnostic evaluation. Rare localizations of peripheral neuropathy, however, often require more extensive diagnostic testing and different treatments. Objective To describe rare localizations of peripheral neuropathy, including the appropriate diagnostic evaluation and available treatments. Evidence Review References were identified from PubMed searches with an emphasis on systematic reviews and randomized clinical trials. Articles were also identified through the use of the author's own files. Search terms included common rare neuropathy localizations and their causes, as well as epidemiology, pathophysiology, diagnosis, and treatment. Findings Diffuse, non-length dependent neuropathies, multiple mononeuropathies, polyradiculopathies, plexopathies, and radiculoplexus neuropathies are rare peripheral neuropathy localizations that often require extensive diagnostic testing. Atypical neuropathy features, such as acute/subacute onset, asymmetry, and/or motor predominant signs, are frequently present. The most common diffuse, non-length dependent neuropathies are Guillain-Barre syndrome (GBS), chronic inflammatory demyelinating polyneuropathy (CIDP), multifocal motor neuropathy (MMN), and amyotrophic lateral sclerosis (ALS). Effective disease modifying therapies exist for many diffuse, non-length dependent neuropathies including GBS, CIDP, MMN, and some paraprotein-associated demyelinating neuropathies. Vasculitic neuropathy (multiple mononeuropathy) also has efficacious treatment options, but definitive evidence of a treatment effect for IgM anti-MAG neuropathy and diabetic amyoptrophy (radiculoplexus neuropathy) is lacking. Conclusions and Relevance Recognition of rare localizations of periperhal neuropathy is essential given the implications for diagnostic testing and treatment. Electrodiagnostic studies are an important early step in the

  11. 2011 Review and outlook of China rare earth market

    Institute of Scientific and Technical Information of China (English)

    Zhang Lihua; Bai Jinlong

    2012-01-01

    In 2011, the start year of the "Twelfth-Five Year Plan" program, a series of policies were issued targeting on rare earth industry. Price of rare earths fluctuated sharply during 2011 and consumers were concerned about the supply of rare earth. There was a big change in rare earth industry.

  12. 2007 China Rare Earths Import & Export Analysis and Suggestions (continued)

    Institute of Scientific and Technical Information of China (English)

    Yin Jianhua; Zuo Xichao

    2008-01-01

    @@ 4. Increasing import of rare earth resources products As a big producer and an important export country of rare earth products for years, rare earths import is in an auxiliary position in China. import volume is rather small. However, since the strengthened macro control measures and restriction of mining scale in 2007, domestic rare earth supply was tight in China.

  13. Prices of Rare Earth Products Tend to Rise(Continued)

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    8. Ji Daiyu, General Manager of Baotou Xinyuan RareEarth Hi-Tech Materials Co. LtdControl gross to stabilize prices. Chinese rare earth is precious strategic resource. The more it is exploit, the less it will be. The State has put forward rare earth policy of "strengthen management, protect resource, develop scientifically and face international". Chinese rare earth

  14. Analyzing rare diseases terms in biomedical terminologies Analizzare la terminologia biomedica sulle malattie rare

    Directory of Open Access Journals (Sweden)

    Erika Pasceri

    2012-06-01

    Full Text Available Rare disease patients too often face common problems, including the lack of access to correct diagnosis, lack of quality information on the disease, lack of scientific knowledge of the disease, inequities and difficulties in access to treatment and care. These things could be changed by implementing a comprehensive approach to rare diseases, increasing international cooperation in scientific research, by gaining and sharing scientific knowledge about and by developing tools for extracting and sharing knowledge. A significant aspect to analyze is the organization of knowledge in the biomedical field for the proper management and recovery of health information. For these purposes, the sources needed have been acquired from the Office of Rare Diseases Research, the National Organization of Rare Disorders and Orphanet, organizations that provide information to patients and physicians and facilitate the exchange of information among different actors involved in this field. The present paper shows the representation of rare diseases terms in biomedical terminologies such as MeSH, ICD-10, SNOMED CT and OMIM, leveraging the fact that these terminologies are integrated in the UMLS. At the first level, it was analyzed the overlap among sources and at a second level, the presence of rare diseases terms in target sources included in UMLS, working at the term and concept level. We found that MeSH has the best representation of rare diseases terms.Pazienti affetti da malattie rare molto spesso affrontano problemi comuni, tra cui la mancanza di accesso alla diagnosi corretta, la mancanza di informazioni di qualità sulla malattia, la mancanza di conoscenze scientifiche, e le difficoltà di accesso al trattamento e cura. Inadempienze e lacune che potrebbero essere colmate mediante l'attuazione di un approccio globale alle malattie rare, aumentando la cooperazione internazionale nella ricerca scientifica e lo sviluppo di strumenti per l'estrazione e la

  15. Fasciola hepatica infestation as a very rare cause of extrahepatic cholestasis

    Institute of Scientific and Technical Information of China (English)

    Ahmet Dobrucali; Rafet Yigitbasi; Yusuf Erzin; Oguzhan Sunamak; Erdal Polat; Hakan Yakar

    2004-01-01

    Fasciola hepatica, an endemic parasite in Turkey, is still a very rare cause of cholestasis worldwide. Through ingestion of contaminated water plants like watercress, humans can become the definitive host of this parasite. Cholestatic symptoms may be sudden but in some cases they may be preceeded by a long period of fever, eosinophilia and vague gastrointestinal symptoms. We report a woman with cholangitis symptoms of sudden onset which was proved to be due to Fasciola hepatica infestation by an endoscopic retrograde cholangiography.

  16. Rare enemies and rare friends: adaptations that make other adaptations maladaptive

    NARCIS (Netherlands)

    Planqué, R.; Franks, N.R.; Britton, N.F.

    2002-01-01

    We show that certain adaptations can make other adaptations maladaptive. For example, one line of defence against an enemy can make an otherwise valuable, but subsequent line of defence detrimental. This can occur through indirect rare enemy effects.

  17. Rare enemies and rare friends: adaptations that make other adaptations maladaptive

    NARCIS (Netherlands)

    R. Planqué (Robert); N.R. Franks; N.F. Britton

    2002-01-01

    textabstractWe show that certain adaptations can make other adaptations maladaptive. For example, one line of defence against an enemy can make an otherwise valuable, but subsequent line of defence detrimental. This can occur through indirect rare enemy effects.

  18. Effect of Rare Earths on Composition and Activities of Rare Earth Elements Binding Glycoprotein in Tea

    Institute of Scientific and Technical Information of China (English)

    汪东风; 李俊; 赵贵文; 王常红; 魏正贵; 尹明

    2001-01-01

    The effects of spraying rare earths(RE) on composition and activities of tea polysaccharide were measured by inductively coupled plasma mass spectrometry (ICP-MS), gas chromatography(GC), amino acid analyzer and animal models. The results show that there are rare earth elements binding glycoprotein in tea (REE-TGP). The effects of RE on composition and content of saccharides in REE-TGP are not obvious. The contents of Hypro and Ser in REE-TGP are evidently enhanced in comparison with that in control (not treated with rare earth), but the content of Glu is smaller than that from control. The content of La in REE-TGP from the tea garden sprayed rare earth is 193% higher than that in control. REE-TGP declines content of blood sugar in mice and enhances immunization of rat, which are very evident when the animals are treated by REE-TGP from the tea garden sprayed RE.

  19. Hepatobiliary cystadenoma: a rare pediatric tumor.

    Science.gov (United States)

    Tran, Sifrance; Berman, Loren; Wadhwani, Nitin R; Browne, Marybeth

    2013-08-01

    Hepatobiliary cystadenoma is a rare hepatic neoplasm that has been reported only 10 times in the pediatric population. Although considered a benign cystic tumor of the liver, hepatobiliary cystadenoma has a high risk of recurrence with incomplete excision and a potential risk for malignant degeneration. Complete tumor excision with negative margins is the mainstay in treatment. Unfortunately, due to the paucity of cases and its vague presentation, hepatobiliary cystadenoma is rarely diagnosed preoperatively. Therefore, in patients with hepatic cystic masses without a clear diagnosis, total resection of the lesion with negative margins is indicated to adequately evaluate for malignant potential and limit the risk of recurrence. We describe a 2-year-old girl with an asymptomatic abdominal mass that was found to be hepatobiliary cystadenoma. In addition, the pathogenic, histopathologic and clinical features of hepatobiliary cystadenoma are reviewed.

  20. Theory of Rare-Earth Alloys

    DEFF Research Database (Denmark)

    Lindgård, Per-Anker

    1977-01-01

    A mean-field random alloy theory combined with a simple calculation of the exchange interaction J(c,Q) is shown to quantitatively account for the phase diagrams for alloys of rare-earth metals with Y, Lu, Sc, and other rare-earth metals. A concentration-dependent J(c,Q) explains the empirical 2...... to account for all alloys except the Sc based. The exceptional behavior of the Sc alloys is due to a low density of states for Sc. A brief discussion is given of the effect on the mean-field results of changes in volume or c/a ratio and of critical fluctuations. Since the physical mechanisms of these ideal...