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https://www.readbyqxmd.com/read/28222176/correction-a-complete-fossil-calibrated-phylogeny-of-seed-plant-families-as-a-tool-for-comparative-analyses-testing-the-time-for-speciation-hypothesis
#1
Liam W Harris, T Jonathan Davies
[This corrects the article DOI: 10.1371/journal.pone.0162907.].
2017: PloS One
https://www.readbyqxmd.com/read/28219973/sulfoquinovose-in-the-biosphere-occurrence-metabolism-and-functions
#2
REVIEW
Ethan D Goddard-Borger, Spencer J Williams
The sulfonated carbohydrate sulfoquinovose (SQ) is produced in quantities estimated at some 10 billion tonnes annually and is thus a major participant in the global sulfur biocycle. SQ is produced by most photosynthetic organisms and incorporated into the sulfolipid sulfoquinovosyl diacylglycerol (SQDG), as well as within some archaea for incorporation into glycoprotein N-glycans. SQDG is found mainly within the thylakoid membranes of the chloroplast, where it appears to be important for membrane structure and function and for optimal activity of photosynthetic protein complexes...
February 20, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28219238/public-health-risk-of-arsenic-species-in-chicken-tissues-from-live-poultry-markets-of-guangdong-province-china
#3
Yuanan Hu, Wenfeng Zhang, Hefa Cheng, Shu Tao
Arsenic-based feed additives, such as roxarsone (ROX), are still legally and widely used in food animal production in many countries. This study was conducted to systematically characterize the content and speciation of arsenic in chicken tissues from live poultry markets and in commercial chicken feeds in Guangdong, a major poultry production and consumption province in China, and to assess the corresponding public health risk. The total arsenic contents in the commercial feeds could be modeled as a mixture of two log-normal distributions (geometric means: 0...
February 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28216663/the-importance-of-pollen-chemistry-in-evolutionary-host-shifts-of-bees
#4
Maryse Vanderplanck, Nicolas J Vereecken, Laurent Grumiau, Fabiana Esposito, Georges Lognay, Ruddy Wattiez, Denis Michez
Although bee-plant associations are generally maintained through speciation processes, host shifts have occurred during evolution. Understanding shifts between both phylogenetically and morphologically unrelated plants (i.e., host-saltation) is especially important since they could have been key processes in the origin and radiation of bees. Probably far from being a random process, such host-saltation might be driven by hidden constraints associated with plant traits. We selected two clades of oligolectic bees (i...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28216136/arsenic-speciation-in-the-lower-athabasca-river-watershed-a-geochemical-investigation-of-the-dissolved-and-particulate-phases
#5
Mark W Donner, Muhammad Babar Javed, William Shotyk, Kevin A Francesconi, Tariq Siddique
Human and ecosystem health concerns for arsenic (As) in the lower Athabasca River downstream of Athabasca Bituminous Sands (ABS) mining (Alberta, Canada) prompted an investigation to determine its forms in surface and groundwater upstream and downstream of industry. Dissolved As species, together with total and particulate As, were used to evaluate the potential bioavailability of As in water as well as to decipher inputs from natural geological processes and ABS mining and upgrading activities. Water samples were collected from the river in October at 13 locations in 2014 and 19 locations in 2015, spanning up to 125 km...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28216132/arsenic-v-bioconcentration-kinetics-in-freshwater-macroinvertebrates-and-periphyton-is-influenced-by-ph
#6
Adeline R Lopez, David H Funk, David B Buchwalter
Arsenic is an important environmental pollutant whose speciation and mobility in freshwater food webs is complex. Few studies have characterized uptake and efflux rates of arsenic in aquatic benthic invertebrates. Further, we lack a fundamental understanding of how pH influences uptake kinetics in these organisms or how this key environmental variable could alter dietary exposure for primary consumers. Here we used a radiotracer approach to characterize arsenate accumulation dynamics in benthic invertebrates, the influence of pH on uptake in a subset of these organisms, and the influence of pH on uptake of arsenate by periphyton - an important food source at the base of aquatic food webs...
February 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28215971/characterization-and-inventory-of-pbdd-f-emissions-from-deca-bde-polyethylene-pe-and-metal-blends-during-the-pyrolysis-process
#7
Jun Mei, Xiuji Wang, Xiao Xiao, Ying Cai, Yuhui Tang, Pei Chen
The thermal treatment of waste electrical and electronic equipment (WEEE) is regarded as the largest potential contributor to the environmental release of polybrominated dibenzo-p-dioxins/dibenzofurans (PBDD/Fs). Herein, the pyrolysis of decabromodiphenyl ether (deca-BDE), polyethylene (PE) and metal blends was conducted to investigate the emission characteristics of PBDD/Fs at different thermal treatment conditions. The total yield of polybrominated dibenzo-p-dioxins (PBDDs) was less than that of polybrominated dibenzofurans (PBDFs) during the pyrolysis of the PE matrix and metal blends...
February 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28215859/evaluation-of-molecular-methods-for-the-field-study-of-the-natural-history-of-dicrocoelium-dendriticum
#8
Gillian Mitchell, Grace Cuthill, Alex Haine, Ruth Zadoks, Umer Chaudhry, Philip Skuce, Neil Sargison
There is a need for improved methods for the study of the impacts of climatic and livestock management change on the epidemiology of production-limiting helminth parasitic diseases. In this study we report the application of molecular methods to describe the natural history of the small lancet fluke, Dicrocoelium dendriticum on Machair pastures on the Inner Hebridean Isle of Coll. Our results build upon those of the only previous historic field study of D. dendriticum in the British Isles that had been undertaken on the same study site...
February 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28215804/pyrogenic-carbon-in-australian-soils
#9
Fangjie Qi, Ravi Naidu, Nanthi S Bolan, Zhaomin Dong, Yubo Yan, Dane Lamb, Thomas D Bucheli, Girish Choppala, Luchun Duan, Kirk T Semple
Pyrogenic carbon (PyC), the combustion residues of fossil fuel and biomass, is a versatile soil fraction active in biogeochemical processes. In this study, the chemo-thermal oxidation method (CTO-375) was applied to investigate the content and distribution of PyC in 30 Australian agricultural, pastoral, bushland and parkland soil with various soil types. Soils were sampled incrementally to 50cm in 6 locations and at another 7 locations at 0-10cm. Results showed that PyC in Australian soils typically ranged from 0...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28215350/species-delimitation-and-phylogeography-of-the-pectenia-species-complex-a-misunderstood-case-of-species-pairs-in-lichenized-fungi-where-reproduction-mode-does-not-delimit-lineages
#10
Mónica A G Otálora, Isabel Martínez, Gregorio Aragón, Mats Wedin
The main goal of this work was to study species boundaries in the genus Pectenia and elucidate the biogeographic history of the four currently accepted species. To accomplish this, we included 92 specimens across the range of Pectenia in Europe and northern Africa. We used three nuclear loci and assessed species circumscription using two Bayesian coalescent-based methods and the Bayes Factor approach. We reviewed the value of reproductive mode and other morphological features as predictors of monophyletic groups...
March 2017: Fungal Biology
https://www.readbyqxmd.com/read/28214944/the-vascular-plants-open-system-of-growth
#11
REVIEW
Alice Basile, Marco Fambrini, Claudio Pugliesi
What is fascinating in plants (true also in sessile animals such as corals and hydroids) is definitely their open and indeterminate growth, as a result of meristematic activity. Plants as well as animals are characterized by a multicellular organization, with which they share a common set of genes inherited from a common eukaryotic ancestor; nevertheless, circa 1.5 billion years of evolutionary history made the two kingdoms very different in their own developmental biology. Flowering plants, also known as angiosperms, arose during the Cretaceous Period (145-65 million years ago), and up to date, they count around 235,000 species, representing the largest and most diverse group within the plant kingdom...
February 18, 2017: Development Genes and Evolution
https://www.readbyqxmd.com/read/28213971/mass-turnover-and-recovery-dynamics-of-a-diverse-australian-continental-radiation
#12
Ian G Brennan, Paul M Oliver
Trends in global and local climate history have been linked to observed macroevolutionary patterns across a variety of organisms. These climatic pressures may unilaterally or asymmetrically influence the evolutionary trajectory of clades. To test and compare signatures of changing global (Eocene-Oligocene boundary cooling) and continental (Miocene aridification) environments on a continental fauna, we investigated the macroevolutionary dynamics of one of Australia's most diverse endemic radiations, pygopodoid geckos...
February 18, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28213498/dispersal-assembly-of-rain-forest-tree-communities-across-the-amazon-basin
#13
Kyle G Dexter, Mathew Lavin, Benjamin M Torke, Alex D Twyford, Thomas A Kursar, Phyllis D Coley, Camila Drake, Ruth Hollands, R Toby Pennington
We investigate patterns of historical assembly of tree communities across Amazonia using a newly developed phylogeny for the species-rich neotropical tree genus Inga We compare our results with those for three other ecologically important, diverse, and abundant Amazonian tree lineages, Swartzia, Protieae, and Guatteria Our analyses using phylogenetic diversity metrics demonstrate a clear lack of geographic phylogenetic structure, and show that local communities of Inga and regional communities of all four lineages are assembled by dispersal across Amazonia...
February 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28213433/chromosomal-instability-as-a-driver-of-tumor-heterogeneity-and-evolution
#14
Samuel F Bakhoum, Dan Avi Landau
Large-scale, massively parallel sequencing of human cancer samples has revealed tremendous genetic heterogeneity within individual tumors. Indeed, tumors are composed of an admixture of diverse subpopulations-subclones-that vary in space and time. Here, we discuss a principal driver of clonal diversification in cancer known as chromosomal instability (CIN), which complements other modes of genetic diversification creating the multilayered genomic instability often seen in human cancer. Cancer cells have evolved to fine-tune chromosome missegregation rates to balance the acquisition of heterogeneity while preserving favorable genotypes, a dependence that can be exploited for a therapeutic benefit...
February 17, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28213306/phosphorous-extractability-and-ryegrass-availability-from-bio-waste-composts-in-a-calcareous-soil
#15
Marco Grigatti, Elisa Boanini, Silvia Mancarella, Andrea Simoni, Massimo Centemero, Adrie H M Veeken
In this work four stable bio-waste composts (C1, C2, C3, C4) were selected on the basis of their increasing water soluble P (H2O-P). The P speciation was assessed via sequential chemical extraction (SCE) on the same products. Moreover, the plant-available P was assessed via apparent recovery fraction approach (ARF) in a pot test on ryegrass over 21 weeks at 15 mg P kg(-)(1) of soil. An inorganic P source (P-chem) was added as a reference at the same P rate in addition to a non-fertilized control (Control)...
February 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28212865/casein-kinase-2-interacting-protein-1-regulates-m1-and-m2-inflammatory-macrophage-polarization
#16
Yuhan Chen, Wen Liu, Yiwu Wang, Luo Zhang, Jun Wei, Xueli Zhang, Fuchu He, Lingqiang Zhang
The importance of macrophage plasticity, albeit being discovered recently, has been highlighted in a broad spectrum of biological processes operative in physiological and pathological environments. Macrophage polarized activation and inactivation has profound effects on immune and inflammatory responses with several major pathways being elucidated in the past few years. However, transcriptional regulation mechanisms governing macrophage polarization is still preliminary. In this study, we identify the Casein Kinase 2 Interacting Protein 1 (CKIP-1) as a molecular toggle manipulating macrophage speciation...
February 14, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28212040/synthesis-and-speciation-dependent-properties-of-a-multimetallic-model-complex-of-nisod-that-exhibits-unique-hydrogen-bonding
#17
Ramsey A Steiner, Stephen P Dzul, Timothy L Stemmler, Todd C Harrop
The complex Na3[{Ni(II)(nmp)}3S3BTA(alk))] (1) (nmp(2-) = deprotonated form of N-(2-mercaptoethyl)picolinamide; H3S3BTA(alk) = N(1),N(3),N(5)-tris(2-mercaptoethyl)benzene-1,3,5-tricarboxamide, where H = dissociable protons), supported by the thiolate-benzenetricarboxamide scaffold (S3BTA(alk)), has been synthesized as a trimetallic model of nickel-containing superoxide dismutase (NiSOD). X-ray absorption spectroscopy (XAS) and (1)H NMR measurements on 1 indicate that the Ni(II) centers are square-planar with N2S2 coordination, and Ni-N and Ni-S distances of 1...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212026/isotope-tracers-to-study-the-environmental-fate-and-bioaccumulation-of-metal-containing-engineered-nanoparticles-techniques-and-applications
#18
Yongguang Yin, Zhiqiang Tan, Ligang Hu, Sujuan Yu, Jingfu Liu, Guibin Jiang
The rapidly growing applicability of metal-containing engineered nanoparticles (MENPs) has made their environmental fate, biouptake, and transformation important research topics. However, considering the relatively low concentration of MENPs and the high concentration of background metals in the environment and in organisms, tracking the fate of MENPs in environment-related scenarios remains a challenge. Intrinsic labeling of MENPs with radioactive or stable isotopes is a useful tool for the highly sensitive and selective detection of MENPs in the environment and organisms, thus enabling tracing of their transformation, uptake, distribution, and clearance...
February 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28212016/thermodynamic-insight-into-the-solvation-and-complexation-behavior-of-u-vi-in-ionic-liquid-binding-of-cmpo-with-u-vi-studied-by-optical-spectroscopy-and-calorimetry
#19
Qi Wu, Taoxiang Sun, Xianghai Meng, Jing Chen, Chao Xu
The complexation of U(VI) with octylphenyl-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO, denoted as L) in ionic liquid (IL) C4mimNTf2 was investigated by UV-vis absorption spectrophotometry and isothermal titration calorimetry. Spectro-photometric titration suggests that three successive complexes, UO2Lj(2+) (j = 1-3), formed both in "dry" (water content < 250 ppm) and "wet" (water content ≈ 12 500 ppm) ionic liquid. However, the thermodynamic parameters are distinctly different in the two ILs...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211688/functionalized-triptycene-derived-tripodal-ligands-privileged-formation-of-tetranuclear-cage-assemblies-with-larger-ln-iii
#20
Alexandra Vuillamy, Soumaila Zebret, Céline Besnard, Virginie Placide, Stéphane Petoud, Josef Hamacek
In this Article, we report the self-assembly of lanthanide complexes formed with two new tripodal ligands, L2 and L3, where binding strands are connected to a rigid triptycene anchor. The pyridine moieties are functionalized with methoxy and PEG groups to enhance ligand solubility and to evaluate the effect of these substituents on lanthanide coordination. These ligands were successfully synthesized and characterized, and their coordination properties were examined along the lanthanide series through speciation studies with NMR and ESI-MS...
February 17, 2017: Inorganic Chemistry
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