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https://www.readbyqxmd.com/read/28793033/a-contribution-for-the-limnological-knowledge-of-basaltic-knickzones
#1
E M Brambilla, A M C Ruocco, M G Nogueira
The knickzones are defined as locally steep riverbed segments, such as a convex reach in a concave-up longitudinal profile. They are worldwide distributed and geologically well studied, but despite their distinctiveness as a particular kind of macrohabitat there is a notorious lack of ecological knowledge. In this context, this research proposal aims to provide a physical description, in terms of kind of habitats, and a limnological characterization of a basaltic knickzone. Information is based on a case study carried out in the Sapucaí-Mirim River, Southeast Brazil...
July 27, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28774341/modeling-tumor-cell-adaptations-to-hypoxia-in-multicellular-tumor-spheroids
#2
REVIEW
Stephen Riffle, Rashmi S Hegde
Under hypoxic conditions, tumor cells undergo a series of adaptations that promote evolution of a more aggressive tumor phenotype including the activation of DNA damage repair proteins, altered metabolism, and decreased proliferation. Together these changes mitigate the negative impact of oxygen deprivation and allow preservation of genomic integrity and proliferative capacity, thus contributing to tumor growth and metastasis. As a result the presence of a hypoxic microenvironment is considered a negative clinical feature of many solid tumors...
August 3, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28755429/identifying-keystone-habitats-with-a-mosaic-approach-can-improve-biodiversity-conservation-in-disturbed-ecosystems
#3
Sean M Hitchman, Martha E Mather, Joseph M Smith, Jane S Fencl
Conserving native biodiversity in the face of human- and climate-related impacts is a challenging and globally important ecological problem that requires an understanding of spatially-connected, organismal-habitat relationships. Globally, a suite of disturbances (e.g., agriculture, urbanization, climate change) degrades habitats and threatens biodiversity. A mosaic approach (in which connected, interacting collections of juxtaposed habitat patches are examined) provides a scientific foundation for addressing many disturbance-related, ecologically-based conservation problems...
July 28, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28730805/integrating-discovery-driven-proteomics-and-selected-reaction-monitoring-to-develop-a-non-invasive-assay-for-geoduck-reproductive-maturation
#4
Emma B Timmins-Schiffman, Grace A Crandall, Brent Vadopalas, Michael E Riffle, Brook L Nunn, Steven Roberts
Geoduck clams (Panopea generosa) are an increasingly important fishery and aquaculture product along the eastern Pacific coast from Baja California, Mexico to Alaska. These long-lived clams are highly fecund, though sustainable hatchery production of genetically diverse larvae is hindered by the lack of sexual dimorphism, resulting in asynchronous spawning of broodstock, unequal sex ratios, and low numbers of breeders. Development of assays of gonad physiology could indicate sex and maturation stage, as well as be used to assess the status of natural populations...
July 21, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28667932/combined-effects-of-water-stress-and-pollution-on-macroinvertebrate-and-fish-assemblages-in-a-mediterranean-intermittent-river
#5
Eleni Kalogianni, Aikaterini Vourka, Ioannis Karaouzas, Leonidas Vardakas, Sofia Laschou, Nikolaos Th Skoulikidis
Water stress is a key stressor in Mediterranean intermittent rivers exacerbating the negative effects of other stressors, such as pollutants, with multiple effects on different river biota. The current study aimed to determine the response of macroinvertebrate and fish assemblages to instream habitat and water chemistry, at the microhabitat scale and at different levels of water stress and pollution, in an intermittent Mediterranean river. Sampling was conducted at high and low summer discharge, at two consecutive years, and included four reaches that were targeted for their different levels of water stress and pollution...
June 28, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28660542/comparing-two-periphyton-collection-methods-commonly-used-for-stream-bioassessment-and-the-development-of-numeric-nutrient-standards
#6
Ashley R Rodman, J Thad Scott
Periphyton is an important component of stream bioassessment, yet methods for quantifying periphyton biomass can differ substantially. A case study within the Arkansas Ozarks is presented to demonstrate the potential for linking chlorophyll-a (chl-a) and ash-free dry mass (AFDM) data sets amassed using two frequently used periphyton sampling protocols. Method A involved collecting periphyton from a known area on the top surface of variably sized rocks gathered from relatively swift-velocity riffles without discerning canopy cover...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28610387/vietelmis-jablonskii-a%C3%A2-new-species-of-riffle-beetle-from-laos-and-thailand-and-new-faunistic-records-on-vietelmis-del%C3%A3-ve-1968-from-malaysia-coleoptera-elmidae
#7
Ján Kodada, Narumon Sangpradub, Rungnapa Somnark, Daniel Gruľa, Dávid Žiak, Hendrik Freitag
A new species of riffle beetle, Vietelmis jablonskii, from Laos and Thailand is described and illustrated. Differences to other Vietelmis species are discussed and an identification key for the Vietelmis is presented. New faunistic records are provided for V. kovaci Kodada & Čiampor, 2000; the genus Vietelmis is newly recorded for Thailand.
May 15, 2017: Zootaxa
https://www.readbyqxmd.com/read/28609974/a-revision-of-the-south-african-riffle-beetle-genus-i-leielmis-i-del%C3%A3-ve-1964-coleoptera-elmidae
#8
David T Bilton
The riffle beetle genus Leielmis Delève, 1964 is redescribed and shown to contain three species, all of which are apparently endemic to the South African Cape, where they live in permanent mountain streams with cold running water. A lectotype is designated for Helmis georyssoides Grouvelle, 1890, and two additional species (L. gibbosus sp. nov. and L. hirsutus sp. nov.) are described for the first time. Following study of the type series, L. georyssoides is shown to be endemic to Table Mountain; most specimens previously assigned to this taxon representing an additional species (L...
April 12, 2017: Zootaxa
https://www.readbyqxmd.com/read/28603055/efficacy-of-a-4-food-elimination-diet-for-children-with-eosinophilic-esophagitis
#9
A F Kagalwalla, J B Wechsler, K Amsden, S Schwartz, M Makhija, A Olive, C M Davis, M Manuel-Rubio, S Marcus, M Sulkowski, K Johnson, J N Ross, M E Riffle, M Groetch, H Melin-Aldana, D Schady, H Palac, K-Y A Kim, B K Wershil, M H Collins, M Chehade
BACKGROUND & AIMS: A 6-food elimination diet induces remission in most children and adults with eosinophilic esophagitis (EoE). The effectiveness of empiric elimination of only 4 foods has not been studied in children. We performed a prospective observational outcome study in children with EoE treated with dietary exclusion of cow's milk, wheat, egg, and soy. The objective was to assess the clinical, endoscopic, and histologic efficacy of this treatment in EoE. METHODS: We recruited children (1-18 years old, diagnosed per consensus guidelines) from 4 medical centers...
June 8, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28600839/social-media-presence-of-otolaryngology-journals-the-past-present-and-future
#10
Kevin Wong, Jacquelyn Piraquive, Jessica R Levi
OBJECTIVES/HYPOTHESIS: Evaluate the use of Twitter by otolaryngology journals and determine the relationship between social media altmetrics and measures of academic impact. STUDY DESIGN: Cross-sectional analysis. METHODS: Twitter profiles from the top 50 otolaryngology journals per 2016 SCImago Journal & Country Rank (SJR) were included. Twitter activity for each profile was calculated using Twitonomy analytics and Riffle software. Social media influence was measured using Klout scores...
June 10, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28531960/multiple-stress-response-of-lowland-stream-benthic-macroinvertebrates-depends-on-habitat-type
#11
Daniel Graeber, Tinna M Jensen, Jes J Rasmussen, Tenna Riis, Peter Wiberg-Larsen, Annette Baattrup-Pedersen
Worldwide, lowland stream ecosystems are exposed to multiple anthropogenic stress due to the combination of water scarcity, eutrophication, and fine sedimentation. The understanding of the effects of such multiple stress on stream benthic macroinvertebrates has been growing in recent years. However, the interdependence of multiple stress and stream habitat characteristics has received little attention, although single stressor studies indicate that habitat characteristics may be decisive in shaping the macroinvertebrate response...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28530822/synthesis-and-membrane-properties-of-sulfonated-poly-arylene-ether-sulfone-statistical-copolymers-for-electrolysis-of-water-influence-of-meta-and-para-substituted-comonomers
#12
Amin Daryaei, Gregory C Miller, Jason Willey, Shreya Roy Choudhury, Britannia Vondrasek, Dana Kazerooni, Matthew R Burtner, Cortney Mittelsteadt, John J Lesko, Judy S Riffle, James E McGrath
Two series of high molecular weight disulfonated poly(arylene ether sulfone) random copolymers were synthesized as proton exchange membranes for high-temperature water electrolyzers. These copolymers differ based on the position of the ether bonds on the aromatic rings. One series is comprised of fully para-substituted hydroquinone comonomer, and the other series incorporated 25 mol % of a meta-substituted comonomer resorcinol and 75 mol % hydroquinone. The influence of the substitution position on water uptake and electrochemical properties of the membranes were investigated and compared to that of the state-of-the-art membrane Nafion...
June 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28521819/linking-hypoxia-dna-damage-and-proliferation-in-multicellular-tumor-spheroids
#13
Stephen Riffle, Ram Naresh Pandey, Morgan Albert, Rashmi S Hegde
BACKGROUND: Multicellular Tumor Spheroids are frequently used to mimic the regionalization of proliferation and the hypoxic environment within avascular tumors. Here we exploit these features to study the activation of DNA damage repair pathways and their correlation to developing hypoxia. METHODS: Activation of DNA damage repair markers, proliferation, cell death, glycogen accumulation and developing hypoxia were investigated using immunofluorescence, immuno-histochemistry, EdU incorporation, Western blots, COMET assays, and pharmacological agents in A673 Ewing sarcoma spheroids and monolayer cultures...
May 18, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28472043/adequacy-of-laser-diffraction-for-soil-particle-size-analysis
#14
Peter Fisher, Colin Aumann, Kohleth Chia, Nick O'Halloran, Subhash Chandra
Sedimentation has been a standard methodology for particle size analysis since the early 1900s. In recent years laser diffraction is beginning to replace sedimentation as the prefered technique in some industries, such as marine sediment analysis. However, for the particle size analysis of soils, which have a diverse range of both particle size and shape, laser diffraction still requires evaluation of its reliability. In this study, the sedimentation based sieve plummet balance method and the laser diffraction method were used to measure the particle size distribution of 22 soil samples representing four contrasting Australian Soil Orders...
2017: PloS One
https://www.readbyqxmd.com/read/28423423/invertebrates-fungal-biomass-and-leaf-breakdown-in-pools-and-riffles-of-neotropical-streams
#15
Renato Tavares Martins, Lidimara Souza da Silveira, Marcos Pereira Lopes, Roberto Gama Alves
We evaluated fungal biomass (as ergosterol concentration) and invertebrate colonization during leaf breakdown of Picramnia sellowii Planch. (Picramniaceae) in pools and riffles of three low-order forested streams in southeastern Brazil. We hypothesized that leaf breakdown will be higher in riffles due to the high physical fragmentation and fungal activity. The experiment was carried out during the dry season of 2012, using 108 litter bags, each containing 3 ± 0.05 g of air-dried leaves. After 7, 15, 30, 60, 90, and 120 d of incubation, six litter bags (riffle = 3 and pool = 3) were removed from each stream...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28331072/direct-measurement-of-the-strength-of-microtubule-attachment-to-yeast-centrosomes
#16
Kimberly K Fong, Krishna K Sarangapani, Erik C Yusko, Michael Riffle, Aida Llauró, Beth Graczyk, Trisha N Davis, Charles L Asbury
Centrosomes, or spindle pole bodies (SPBs) in yeast, are vital mechanical hubs that maintain load-bearing attachments to microtubules during mitotic spindle assembly, spindle positioning, and chromosome segregation. However, the strength of microtubule-centrosome attachments is unknown, and the possibility that mechanical force might regulate centrosome function has scarcely been explored. To uncover how centrosomes sustain and regulate force, we purified SPBs from budding yeast and used laser trapping to manipulate single attached microtubules in vitro...
July 7, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28296675/eosinophilic-esophagitis-and-esophageal-granular-cell-tumor-an-unexpected-association
#17
Mary Ellen Riffle, Alexandros D Polydorides, Jessica Niakan, Mirna Chehade
Esophageal granular cell tumors (GCTs) are rare. Eosinophilic esophagitis (EoE) is an immune-mediated disease characterized by esophageal eosinophilia despite proton pump inhibitor (PPI) therapy. Given that GCTs occur at sites of scarring and inflammation, we sought to determine the prevalence of EoE in patients with esophageal GCTs. Our center's pathology database was searched for GCT specimens from 1995 to 2014. Slides were blindly rereviewed. GCTs were scored for atypical cytological features. Presence and number of eosinophils in the tumor and the surrounding esophageal epithelium and any EoE features were recorded...
May 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28191870/the-ndc80-complex-bridges-two-dam1-complex-rings
#18
Jae Ook Kim, Alex Zelter, Neil T Umbreit, Athena Bollozos, Michael Riffle, Richard Johnson, Michael J MacCoss, Charles L Asbury, Trisha N Davis
Strong kinetochore-microtubule attachments are essential for faithful segregation of sister chromatids during mitosis. The Dam1 and Ndc80 complexes are the main microtubule binding components of the Saccharomyces cerevisiae kinetochore. Cooperation between these two complexes enhances kinetochore-microtubule coupling and is regulated by Aurora B kinase. We show that the Ndc80 complex can simultaneously bind and bridge across two Dam1 complex rings through a tripartite interaction, each component of which is regulated by Aurora B kinase...
February 13, 2017: ELife
https://www.readbyqxmd.com/read/28183103/description-of-the-mature-larva-of-i-austrolimnius-i-i-nyctelioides-i-germain-1892-and-i-a-elatus-i-hinton-1941-coleoptera-elmidae
#19
Nicolás Martínez Román, Miguel Archangelsky
Mature larvae of two species of the riffle beetle genus Austrolimnius Carter & Zeck, 1929 are described and illustrated for the first time: Austrolimnius nyctelioides (Germain, 1892) and A. elatus Hinton, 1941. A larval diagnosis for the genus is presented and both larvae are compared with each other and with the previously described larva of A. mucubajiensis Gómez & Bello, 2006. Comments on the species' habitats are included.
January 11, 2017: Zootaxa
https://www.readbyqxmd.com/read/28040495/tips-pentacene-loaded-peo-pdlla-core-shell-nanoparticles-have-similar-cellular-uptake-dynamics-in-m1-and-m2-macrophages-and-in-corresponding-in-vivo-microenvironments
#20
Dylan K McDaniel, Ami Jo, Veronica M Ringel-Scaia, Sheryl Coutermarsh-Ott, Daniel E Rothschild, Michael D Powell, Rui Zhang, Timothy E Long, Kenneth J Oestreich, Judy S Riffle, Richey M Davis, Irving C Allen
Nanoparticle based drug delivery platforms have the potential to transform disease treatment paradigms and therapeutic strategies, especially in the context of pulmonary medicine. Once administered, nanoparticles disperse throughout the lung and many are phagocytosed by macrophages. However, there is a paucity of knowledge regarding cellular up-take dynamics of nanoparticles due largely to macrophage heterogeneity. To address this issue, we sought to better define nanoparticle up-take using polarized M1 and M2 macrophages and novel TIPS-pentacene loaded PEO-PDLLA nanoparticles...
April 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
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