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https://www.readbyqxmd.com/read/28641139/hormonal-profile-and-the-role-of-cell-expansion-in-the-germination-control-of-cerrado-biome-palm-seeds
#1
Daiane Souza Dias, Leonardo Monteiro Ribeiro, Paulo Sérgio Nascimento Lopes, Sergi Munné-Bosch, Queila Souza Garcia
Little information is currently available concerning the mechanisms controlling palm seed germination. We compared the anatomical and physiological aspects of seeds of two neotropical palm species showing different levels of dormancy. The seeds of Attalea vitrivir and Butia capitata were evaluated for the endogenous contents of hormones (ABA, GAs, CKs, BRs, IAA, JA, SA and the ethylene precursor ACC) in their cotyledonary petiole and operculum (structures involved in germination control), the force necessary to displace the operculum, endo-β-mannanase activities, and embryo cell elongation...
June 15, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28637223/millions-of-years-behind-slow-adaptation-of-ruminants-to-grasslands
#2
Olja Toljagic, Kjetil L Voje, Michael Matschiner, Lee Hsiang Liow, Thomas F Hansen
The Late-Cretaceous appearance of grasses, followed by the Cenozoic advancement of grasslands as dominant biomes, has contributed to the evolution of a range of specialized herbivores adapted to new diets, as well as to increasingly open and arid habitats. Many mammals including ruminants, the most diversified ungulate suborder, evolved high-crowned (hypsodont) teeth as an adaptation to tooth-wearing diets and habitats. The impact of different causes of tooth wear is still a matter of debate, and the temporal pattern of hypsodonty evolution in relation to the evolution of grasslands remains unclear...
June 20, 2017: Systematic Biology
https://www.readbyqxmd.com/read/28636252/influence-of-analyzed-lubricant-volumes-on-the-amount-and-characteristics-of-generated-wear-particles-from-three-different-types-of-polyethylene-liner-materials
#3
Jana Markhoff, Carmen Zietz, Christian Fabry, Gerhard Fulda, Rainer Bader
The articulating components of artificial joints consist mainly of metals, ceramics, or polymers. Resulting abrasive wear particles can promote osteolysis and aseptic loosening of the endo-prosthetic implants. Ultra-high-molecular-weight-polyethylene is the material used most for bearing couples in total hip replacement. In the present study, three types of polyethylene (PE) liners varying in material composition, i.e., (1) conventional PE (C-PE), (2) sequentially cross-linked PE (SX-PE), (3) cross-linked PE blended with vitamin E (EX-PE) articulating with two types of femoral heads were used...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28636168/improved-hemodialysis-with-hemocompatible-polyethersulfone-hollow-fiber-membranes-in-vitro-performance
#4
Surendra Kumar Verma, Akshay Modi, Atul Kumar Singh, Rohit Teotia, Jayesh Bellare
We show that addition of nanozeolite (NZ) and vitamin E D-α-Tocopherol polyethylene glycol succinate (TPGS or T) considerably improves the performance of polyethersulfone (PES or P) hollow fiber membrane (HFM) for hemodialysis. Nanocomposite HFMs were manufactured using PES as a polymer, TPGS as an additive and NZ as a filler to give a composite membrane called PT-NZ. HFMs were spun by dry-wet spinning principle based on liquid-liquid phase separation. TPGS and NZ were successfully incorporated in HFMs, as confirmed by EDX elemental mapping...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28636123/sem-imaging-of-the-stimulatory-response-of-raw264-7-cells-against-porphyromonas-gingivalis-using-a-simple-technique-employing-new-conductive-materials
#5
Chisato Takahashi, Yoshiki Umemura, Ayako Naka, Hiromitsu Yamamoto
In the medical biology, it is essential to understand not only biological morphology but also the interaction between biological materials and agents. To study these, electron microscopy (EM) is often utilized. However, sample preparation techniques for EM require a high level of skill and a considerable time. Here, we conducted EM using a simple technique employing a conductive liquid, BEL-1, and compared the results with another simple technique employing an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4 ])...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28632343/dispersal-isolation-and-diversification-with-continued-gene-flow-in-an-andean-tropical-dry-forest
#6
R Toby Pennington, Matt Lavin
The Andes are the world's longest mountain chain, and the tropical Andes are the world's richest biodiversity hot spot. The origin of the tropical Andean cordillera is relatively recent because the elevation of the mountains was relatively low (400-2500 m palaeoelevations) only 10 MYA with final uplift being rapid. These final phases of the Andean orogeny are thought to have had a fundamental role in shaping processes of biotic diversification and biogeography, with these effects reaching far from the mountains themselves by changing the course of rivers and deposition of mineral-rich Andean sediments across the massive Amazon basin...
July 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28631360/reduced-cell-attachment-to-poly-2-hydroxyethyl-methacrylate-coated-ventricular-catheters-in-vitro
#7
Brian W Hanak, Chia-Yun Hsieh, William Donaldson, Samuel R Browd, Kenneth K S Lau, William Shain
The majority of patients with hydrocephalus are dependent on ventriculoperitoneal shunts for diversion of excess cerebrospinal fluid. Unfortunately, these shunts are failure-prone and over half of all life-threatening pediatric failures are caused by obstruction of the ventricular catheter by the brain's resident immune cells, reactive microglia and astrocytes. Poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels are widely used for biomedical implants. The extreme hydrophilicity of PHEMA confers resistance to protein fouling, making it a strong candidate coating for ventricular catheters...
June 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28623068/corrigendum-to-comparative-study-of-therapeutic-response-to-baclofen-vs-tolperisone-in-spasticity-biomed-pharmacother-87-2017-628-635
#8
Saurabh Agarwal, Tejas Patel, Nehal Shah, Bhoomika M Patel
No abstract text is available yet for this article.
June 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28616656/accuracy-of-neutrophil-gelatinase-associated-lipocalin-for-acute-kidney-injury-diagnosis-in-children-systematic-review-and-meta-analysis
#9
REVIEW
Luís Taddeo Filho, Antonio Jose Grande, Tamy Colonetti, Éverton Simon Possamai Della, Maria Inês da Rosa
OBJECTIVE: To estimate the accuracy of Neutrophil Gelatinase-Associated Lipocalin (NGAL) as a biomarker for acute kidney injury (AKI) in children. METHODS: A systematic review of the literature was performed. The review protocol was registered at PROSPERO (CRD 42015024153). We conducted searches in the following databases: Medline (PubMed), LILACS (BVS), SCOPUS (Elsevier), Embase (OVID), Cochrane Central Register of Controlled Trials (CENTRAL), Biomed Central, and ISI Web of Science, from January 1990 to October 2016...
June 14, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28613223/novel-use-of-sterilized-disposable-surgical-lenses-for-posterior-segment-examination-an-opportunity-for-equitable-resource-distribution
#10
Benjamin J Thomas, Aristomenis Thanos, Yoshihiro Yonekawa, Bozho Todorich
PURPOSE: To report a novel technique for repurposing disposable wide-angle lenses used in vitreoretinal surgery for noncontact posterior segment examination. METHODS: Clinical technique report with imaging. RESULTS: The disposable lens for the noncontact BIOM viewing system manufactured by OCULUS Optikgerate GmbH (Wetzler, Germany) is a 100-diopter converging lens with wide-angle viewing ability. When appropriately processed after initial use, this lens is able to safely provide clinically useful viewing of the posterior segment when combined with a slit-lamp microscope, at a fraction of the cost of commercially available lenses...
April 24, 2017: Retina
https://www.readbyqxmd.com/read/28610371/water-beetles-from-the-bokkeveld-plateau-a-semi-arid-hotspot-of-freshwater-biodiversity-in-the-northern-cape-of-south-africa
#11
David T Bilton
The Bokkeveld Plateau in the Northern Cape of South Africa supports a complex transition zone between the fynbos and succulent karoo biomes on the margins of Namaqualand. A combination of regular winter rainfall, geology and strong rainfall gradients mean that the region supports a diverse and highly endemic flora. Recent sampling of aquatic beetles in the Bokkeveld demonstrates that this region also has a diverse freshwater fauna, including a number of apparent endemics. Five new species of Hydraenidae (Pterosthetops chrysomallus sp...
May 16, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610161/the-amazing-diversity-of-the-genus-i-monospilus-i-sars-1862-crustacea-branchiopoda-aloninae-in-south-america
#12
Francisco Diogo R Sousa, Lourdes M A Elmoor-Loureiro, Eliana A Panarelli
The main goal of this paper is to describe three new species of the genus Monospilus Sars, 1862 (Crustacea: Cladocera). Monospilus macroerosus sp. nov. differs from other species of the genus in several peculiar morphological traits, the most striking being the presence of a saw-shaped pecten of teeth on the postabdominal claw. This species inhabits semiterrestrial habitats (wet leaf litter on hydromorphic soil from gallery forest), exhibiting adaptations related to movement and food handling in this type of habitat...
March 13, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610093/-i-aplectana-i-i-nordestina-i-n-sp-nematoda-cosmocercidae-parasitizing-i-leposternon-polystegum-i-squamata-amphisbaenidae-from-northeastern-brazil
#13
Darciane Maria DE Amorim, Lidiane Aparecida Firmino DA Silva, Drausio Honorio Morais, Reinaldo José DA Silva, Robson Waldemar Ávila
There are currently 760 reptile species known in Brazil, from which about 70 are amphisbaenians with 25 species recorded in the Brazilian northeast (Vanzolini 2002; Gomes & Maciel 2012; Costa & Bérnils, 2014; Roberto et al., 2014). Leposternon polystegum Duméril, is a widespread species distributed in the Amazon, Atlantic Forest, Cerrado, and Caatinga biomes (Porto et al., 2000; Ribeiro et al., 2011). The diet is composed mainly by ants, termites, and coleopteran larvae (Barros-Filho & Valverde, 1996; Gomes et al...
March 23, 2017: Zootaxa
https://www.readbyqxmd.com/read/28609462/effects-of-conversion-of-native-cerrado-vegetation-to-pasture-on-soil-hydro-physical-properties-evapotranspiration-and-streamflow-on-the-amazonian-agricultural-frontier
#14
Rodolfo L B Nóbrega, Alphonce C Guzha, Gilmar N Torres, Kristof Kovacs, Gabriele Lamparter, Ricardo S S Amorim, Eduardo Couto, Gerhard Gerold
Understanding the impacts of land-use change on landscape-hydrological dynamics is one of the main challenges in the Northern Brazilian Cerrado biome, where the Amazon agricultural frontier is located. Motivated by the gap in literature assessing these impacts, we characterized the soil hydro-physical properties and quantified surface water fluxes from catchments under contrasting land-use in this region. We used data from field measurements in two headwater micro-catchments with similar physical characteristics and different land use, i...
2017: PloS One
https://www.readbyqxmd.com/read/28609018/pcl-phbv-blended-three-dimensional-scaffolds-fabricated-by-fused-deposition-modeling-and-responses-of-chondrocytes-to-the-scaffolds
#15
Wasana Kosorn, Morakot Sakulsumbat, Paweena Uppanan, Pakkanun Kaewkong, Surapol Chantaweroad, Jaturong Jitsaard, Kriskrai Sitthiseripratip, Wanida Janvikul
In this study, poly(ε-caprolactone)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PCL/PHBV) blended porous scaffolds were fabricated by fused deposition modeling (FDM). PCL/PHBV filaments, initially prepared at different weight ratios, that is, 100/0, 75/25, 50/50, and 25/75, were fabricated by the lay-down pattern of 0/90/45/135° to obtain scaffolds with dimension of 6.0 × 6.0 × 2.5 mm(3) and average filament diameters and channel sizes in the ranges of 370-390 µm and 190-210 µm, respectively. To enhance the surface hydrophilicity of the materials, the scaffolds were subsequently subjected to a low pressure oxygen plasma treatment...
July 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28603688/novel-piroplasmid-and-hepatozoon-organisms-infecting-the-wildlife-of-two-regions-of-the-brazilian-amazon
#16
Herbert S Soares, Arlei Marcili, Amália R M Barbieri, Antonio H H Minervino, Thiago Rocha Moreira, Solange M Gennari, Marcelo B Labruna
During 2009-2012, wild animals were sampled in two areas within the Amazon biome of Brazil, in the states of Mato Grosso and Pará. Animal tissues and blood were molecularly tested for the presence of Piroplasmida (genera Babesia, Theileria, Cytauxzoon) or Hepatozoon DNA. Overall, 181 wild animals comprising 36 different species (2 reptiles, 5 birds, and 29 mammals) were sampled. The following Piroplasmida agents were detected: Cytauxzoon felis in one ocelot (Leopardus pardalis), Theileria cervi in two red brocket deer (Mazama americana), Theileria spp...
August 2017: International Journal for Parasitology. Parasites and Wildlife
https://www.readbyqxmd.com/read/28599366/a-global-examination-of-the-response-of-ecosystem-water-use-efficiency-to-drought-based-on-modis-data
#17
Ling Huang, Bin He, Le Han, Junjie Liu, Haiyan Wang, Ziyue Chen
Ecosystem water-use efficiency (WUE) plays an important role in carbon and water cycles. Currently, the response of WUE to drought disturbance remains controversial. Based on the global ecosystem gross primary productivity (GPP) product and the evapotranspiration product (ET), both of which were retrieved from the moderate resolution imaging spectroradiometer (MODIS), as well as the drought index, this study comprehensively examined the relationship between ecosystem WUE (WUE=GPP/ET) and drought at the global scale...
June 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28594882/rickettsia-amblyommatis-infecting-ticks-and-exposure-of-domestic-dogs-to-rickettsia-spp-in-an-amazon-cerrado-transition-region-of-northeastern-brazil
#18
Francisco B Costa, Andréa P da Costa, Jonas Moraes-Filho, Thiago F Martins, Herbert S Soares, Diego G Ramirez, Ricardo A Dias, Marcelo B Labruna
This study was performed in Maranhão state, a transition area two Brazilian biomes, Amazon and Cerrado. During 2011-2013, 1,560 domestic dogs were sampled for collection of serum blood samples and ticks in eight counties (3 within the Amazon and 5 within the Cerrado). A total of 959 ticks were collected on 150 dogs (9.6%). Rhipicephalus sanguineus sensu lato (s.l.) was the most abundant tick (68% of all collected specimens), followed by Amblyomma cajennense sensu lato (s.l.) (12.9%), Amblyomma parvum (9.2%), and Amblyomma ovale (5...
2017: PloS One
https://www.readbyqxmd.com/read/28593197/significant-impacts-of-increasing-aridity-on-the-arid-soil-microbiome
#19
Julia W Neilson, Katy Califf, Cesar Cardona, Audrey Copeland, Will van Treuren, Karen L Josephson, Rob Knight, Jack A Gilbert, Jay Quade, J Gregory Caporaso, Raina M Maier
Global deserts occupy one-third of the Earth's surface and contribute significantly to organic carbon storage, a process at risk in dryland ecosystems that are highly vulnerable to climate-driven ecosystem degradation. The forces controlling desert ecosystem degradation rates are poorly understood, particularly with respect to the relevance of the arid-soil microbiome. Here we document correlations between increasing aridity and soil bacterial and archaeal microbiome composition along arid to hyperarid transects traversing the Atacama Desert, Chile...
May 2017: MSystems
https://www.readbyqxmd.com/read/28592668/nineteenth-century-collapse-of-a-benthic-marine-ecosystem-on-the-open-continental-shelf
#20
Adam Tomašových, Susan M Kidwell
The soft-sediment seafloor of the open continental shelf is among the least-known biomes on Earth, despite its high diversity and importance to fisheries and biogeochemical cycling. Abundant dead shells of epifaunal suspension-feeding terebratulid brachiopods (Laqueus) and scallops on the now-muddy mainland continental shelf of southern California reveal the recent, previously unsuspected extirpation of an extensive offshore shell-gravel ecosystem, evidently driven by anthropogenic siltation. Living populations of attached epifauna, which formerly existed in a middle- and outer-shelf mosaic with patches of trophically diverse muds, are restricted today to rocky seafloor along the shelf edge and to the sandier shelves of offshore islands...
June 14, 2017: Proceedings. Biological Sciences
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