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https://www.readbyqxmd.com/read/28435859/the-frequency-and-extent-of-sub-ice-phytoplankton-blooms-in-the-arctic-ocean
#1
Christopher Horvat, David Rees Jones, Sarah Iams, David Schroeder, Daniela Flocco, Daniel Feltham
In July 2011, the observation of a massive phytoplankton bloom underneath a sea ice-covered region of the Chukchi Sea shifted the scientific consensus that regions of the Arctic Ocean covered by sea ice were inhospitable to photosynthetic life. Although the impact of widespread phytoplankton blooms under sea ice on Arctic Ocean ecology and carbon fixation is potentially marked, the prevalence of these events in the modern Arctic and in the recent past is, to date, unknown. We investigate the timing, frequency, and evolution of these events over the past 30 years...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28434535/fruits-of-the-forest-human-stable-isotope-ecology-and-rainforest-adaptations-in-late-pleistocene-and-holocene-%C3%A2-36-to-3-ka-sri-lanka
#2
Patrick Roberts, Nimal Perera, Oshan Wedage, Siran Deraniyagala, Jude Perera, Saman Eregama, Michael D Petraglia, Julia A Lee-Thorp
Sri Lanka has yielded some of the earliest dated fossil evidence for Homo sapiens (∼38-35,000 cal. years BP [calibrated years before present]) in South Asia, within a region that is today covered by tropical rainforest. Archaeozoological and archaeobotanical evidence indicates that these hunter-gatherers exploited tropical forest resources, yet the contribution of these resources to their overall subsistence strategies has, as in other Late Pleistocene rainforest settings, remained relatively unexplored...
May 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28429328/ammonia-production-from-amino-acid-based-biomass-like-sources-by-engineered-escherichia-coli
#3
Yosuke Mikami, Hisanari Yoneda, Yohei Tatsukami, Wataru Aoki, Mitsuyoshi Ueda
The demand for ammonia is expected to increase in the future because of its importance in agriculture, industry, and hydrogen transportation. Although the Haber-Bosch process is known as an effective way to produce ammonia, the process is energy-intensive. Thus, an environmentally friendly ammonia production process is desired. In this study, we aimed to produce ammonia from amino acids and amino acid-based biomass-like resources by modifying the metabolism of Escherichia coli. By engineering metabolic flux to promote ammonia production using the overexpression of the ketoisovalerate decarboxylase gene (kivd), derived from Lactococcus lactis, ammonia production from amino acids was 351 mg/L (36...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28428141/temporal-impact-of-the-vascular-wilt-pathogen-verticillium-dahliae-on-tomato-root-proteome
#4
Katja Witzel, Anja Buhtz, Rita Grosch
The soil-borne fungus Verticillium dahliae is the causal agent of wilting disease and affects a wide range of plant species worldwide. Here, we report on the time-resolved analysis of the tomato root proteome in response to fungal colonization. Tomato (Solanum lycopersicum cv. Hildares) was inoculated with V. dahliae at the two-leaf stage and roots were harvested at 7, 14 and 21 days post inoculation (dpi). In order to identify proteins related to the fungal spread at the different time points, a subsequent proteome analysis by two-dimensional differential gel electrophoresis (2D-DIGE) was conducted on samples from three independent experiments...
April 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28427969/hyperbaric-oxygen-therapy-is-associated-with-lower-short-and-long-term-mortality-in-patients-with-carbon-monoxide-poisoning
#5
Chien-Cheng Huang, Chung-Han Ho, Yi-Chen Chen, Hung-Jung Lin, Chien-Chin Hsu, Jhi-Joung Wang, Shih-Bin Su, How-Ran Guo
BACKGROUND: To date, there has been no consensus about the effect of hyperbaric oxygen therapy (HBOT) on the mortality of patients with carbon monoxide poisoning (COP). This retrospective nationwide population-based cohort study from Taiwan was conducted to clarify this issue. METHODS: Using the Nationwide Poisoning Database, we identified 25,737 COP patients diagnosed between 1999 and 2012, including 7,278 patients who received HBOT and 18,459 patients who did not...
April 17, 2017: Chest
https://www.readbyqxmd.com/read/28427325/global-analysis-of-protein-lysine-succinylation-profiles-in-common-wheat
#6
Yumei Zhang, Guangyuan Wang, Limin Song, Ping Mu, Shu Wang, Wenxing Liang, Qi Lin
BACKGROUND: Protein lysine succinylation is an important post-translational modification and plays a critical regulatory role in almost every aspects of cell metabolism in both eukaryotes and prokaryotes. Common wheat is one of the major global cereal crops. However, to date, little is known about the functions of lysine succinylation in this plant. Here, we performed a global analysis of lysine succinylation in wheat and examined its overlap with lysine acetylation. RESULTS: In total, 330 lysine succinylated modification sites were identified in 173 proteins...
April 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28424945/date-palm-waste-biochars-alter-a-soil-respiration-microbial-biomass-carbon-and-heavy-metal-mobility-in-contaminated-mined-soil
#7
Mohammad I Al-Wabel, Adel Rabie A Usman, Abdullah S Al-Farraj, Yong Sik Ok, Adel Abduljabbar, Abdulelah I Al-Faraj, Abdelazeem S Sallam
A 30-day incubation experiment was conducted using a heavy metal-contaminated mined soil amended with date palm feedstock (FS) and its derivative biochars (BCs) at three pyrolysis temperatures of 300 (BC-300), 500 (BC-500), and 700 °C (BC-700) with different application rates (0.0, 5, 15, and 30 g kg(-1)) to investigate their short-term effects on soil respiration (CO2-C efflux), microbial biomass carbon (MBC), soil organic carbon (SOC), mobile fraction of heavy metals (Cd, Cu, Pb, Zn, Mn, and Fe), pH, and electrical conductivity (EC)...
April 19, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28417281/historical-record-of-anthropogenic-polycyclic-aromatic-hydrocarbons-in-a-lake-sediment-from-the-southern-tibetan-plateau
#8
Ruiqiang Yang, Ruichen Zhou, Ting Xie, Chuanyong Jing
High-altitude lake sediments can be used as natural archives to reconstruct the history of pollutants. In this work, the temporal distribution of polycyclic aromatic hydrocarbons (PAHs) was determined in a sediment core collected from the southern Tibetan Plateau (TP), which was dated by using the (210)Pb dating method and validated with the (137)Cs fallout peak. The concentrations of the anthropogenic PAHs (Σ8PAH) in the sediment core ranged from 0.83 to 12 ng/g dw, and the fluxes of the Σ8PAH were in the range of 2...
April 17, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28416105/do-clear-cell-papillary-renal-cell-carcinomas-have-malignant-potential-diolombi-ml-cheng-l-argani-p-epstein-ji-am-j-surg-pathol-december-2015-39-12-1621-1634
#9
Oleksandr N Kryvenko
There have been no recurrences or metastases of clear cell papillary renal cell carcinoma (CCPRCC) in 268 reported cases with follow-up in the English-language literature. We identified all our cases of CCPRCC (1990-2013), reviewing all cases that preceded the formal designation of the entity. Immunohistochemical stains were performed on 32 cases during their initial workup. In addition, stains for carbonic anhydrase IX and cytokeratin 7 were performed on 2 cases, one with atypical follow-up and the other with a more compact morphology, although not performed initially...
April 13, 2017: Urologic Oncology
https://www.readbyqxmd.com/read/28415863/thermophysical-properties-and-phase-behavior-of-fluids-for-application-in-carbon-capture-and-storage-processes
#10
J P Martin Trusler
Phase behavior and thermophysical properties of mixtures of carbon dioxide with various other substances are very important for the design and operation of carbon capture and storage (CCS) processes. The available empirical data are reviewed, together with some models for the calculation of these properties. The systems considered in detail are, first, mixtures of carbon dioxide, water, and salts; second, carbon dioxide-rich nonelectrolyte mixtures; and third, mixtures of carbon dioxide with water and amines...
April 17, 2017: Annual Review of Chemical and Biomolecular Engineering
https://www.readbyqxmd.com/read/28409924/use-of-multiple-linear-regression-models-for-setting-water-quality-criteria-for-copper-a-complementary-approach-to-the-biotic-ligand-model
#11
Kevin V Brix, David K DeForest, Lucinda Tear, Martin Grosell, William J Adams
Biotic Ligand Models (BLMs) for metals are widely applied in ecological risk assessments and in the development of regulatory water quality guidelines in Europe, and in 2007 the United States Environmental Protection Agency (USEPA) recommended BLM-based water quality criteria (WQC) for Cu in freshwater. However, to-date, few states have adopted BLM-based Cu criteria into their water quality standards on a state-wide basis, which appears to be due to the perception that the BLM is too complicated or requires too many input variables...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28405308/a-gradient-of-nutrient-enrichment-reveals-nonlinear-impacts-of-fertilization-on-arctic-plant-diversity-and-ecosystem-function
#12
Case M Prager, Shahid Naeem, Natalie T Boelman, Jan U H Eitel, Heather E Greaves, Mary A Heskel, Troy S Magney, Duncan N L Menge, Lee A Vierling, Kevin L Griffin
Rapid environmental change at high latitudes is predicted to greatly alter the diversity, structure, and function of plant communities, resulting in changes in the pools and fluxes of nutrients. In Arctic tundra, increased nitrogen (N) and phosphorus (P) availability accompanying warming is known to impact plant diversity and ecosystem function; however, to date, most studies examining Arctic nutrient enrichment focus on the impact of relatively large (>25x estimated naturally occurring N enrichment) doses of nutrients on plant community composition and net primary productivity...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28404240/determination-of-the-post-mortem-interval-in-skeletal-remains-by-the-comparative-use-of-different-physico-chemical-methods-are-they-reliable-as-an-alternative-to-14-c
#13
Alberto Amadasi, Annalisa Cappella, Cristina Cattaneo, Pacifico Cofrancesco, Lucia Cucca, Daniele Merli, Chiara Milanese, Andrea Pinto, Antonella Profumo, Valentina Scarpulla, Emanuela Sguazza
The determination of the post-mortem interval (PMI) of skeletal remains is a challenging aspect in the forensic field. Previous studies focused their attention on different macroscopic and morphological aspects but a thorough and complete evaluation of the potential of chemical and physical analyses in this field of research has not been performed. In addition to luminol test and Oxford histology index (OHI) reported in a recent paper, widely spread and accessible methods based on physical aspect and chemical characteristics of skeletal remains have been investigated as potential alternatives to dating by determination of (14)C...
March 22, 2017: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/28402604/isolated-single-iron-atoms-anchored-on-n-doped-porous-carbon-as-an-efficient-electrocatalyst-for-the-oxygen-reduction-reaction
#14
Yuanjun Chen, Shufang Ji, Yanggang Wang, Juncai Dong, Wenxing Chen, Zhi Li, Rongan Shen, Lirong Zheng, Zhongbin Zhuang, Dingsheng Wang, Yadong Li
The development of low-cost, efficient, and stable electrocatalysts for the oxygen reduction reaction (ORR) is desirable but remains a great challenge. Herein, we made a highly reactive and stable isolated single-atom Fe/N-doped porous carbon (ISA Fe/CN) catalyst with Fe loading up to 2.16 wt %. The catalyst showed excellent ORR performance with a half-wave potential (E1/2 ) of 0.900 V, which outperformed commercial Pt/C and most non-precious-metal catalysts reported to date. Besides exceptionally high kinetic current density (Jk ) of 37...
April 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28399450/synthesis-of-new-n3-substituted-dihydropyrimidine-derivatives-as-l-t-type-calcium-channel-blockers
#15
Mohamed Teleb, Fang-Xiong Zhang, Ahmed M Farghaly, Omaima M Aboul Wafa, Frank R Fronczek, Gerald W Zamponi, Hesham Fahmy
Cardiovascular diseases (CVDs) are the main cause of deaths worldwide. Up-to-date, hypertension is the most significant contributing factor to CVDs. Recent clinical studies recommend calcium channel blockers (CCBs) as effective treatment alone or in combination with other medications. Being the most clinically useful CCBs, 1,4-dihydropyridines (DHPs) attracted great interest in improving potency and selectivity. However, the short plasma half-life which may be attributed to the metabolic oxidation to the pyridine-counterparts is considered as a major limitation for this class...
April 3, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28398217/electron-paramagnetic-resonance-and-photochromism-of-n3v-0-in-diamond
#16
B L Green, B G Breeze, M E Newton
The defect in diamond formed by a vacancy surrounded by three nearest-neighbor nitrogen atoms and one carbon atom, [Formula: see text], is found in the vast majority of natural diamonds. Despite [Formula: see text] being the earliest electron paramagnetic resonance spectrum observed in diamond, to date no satisfactory simulation of the spectrum for an arbitrary magnetic field direction has been produced due to its complexity. In this work, [Formula: see text] is identified in [Formula: see text]-doped synthetic diamond following irradiation and annealing...
April 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28398001/an-update-on-carbon-nanotube-enabled-x-ray-sources-for-biomedical-imaging
#17
REVIEW
Connor Puett, Christina Inscoe, Allison Hartman, Jabari Calliste, Dora K Franceschi, Jianping Lu, Otto Zhou, Yueh Z Lee
A new imaging technology has emerged that uses carbon nanotubes (CNT) as the electron emitter (cathode) for the X-ray tube. Since the performance of the CNT cathode is controlled by simple voltage manipulation, CNT-enabled X-ray sources are ideal for the repetitive imaging steps needed to capture three-dimensional information. As such, they have allowed the development of a gated micro-computed tomography (CT) scanner for small animal research as well as stationary tomosynthesis, an experimental technology for large field-of-view human imaging...
April 11, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28392608/stem-girdling-indicates-prioritized-carbon-allocation-to-the-root-system-at-the-expense-of-radial-stem-growth-in-norway-spruce-under-drought-conditions
#18
Walter Oberhuber, Andreas Gruber, Gina Lethaus, Andrea Winkler, Gerhard Wieser
The early culmination of maximum radial growth (RG) in late spring has been found in several coniferous species in a dry inner Alpine environment. We hypothesized that an early decrease in RG is an adaptation to cope with drought stress, which might require an early switch of carbon (C) allocation to belowground organs. To test this hypothesis, we experimentally subjected six-year-old Norway spruce saplings (tree height: 1.35 m; n = 80 trees) to two levels of soil water availability (watered versus drought conditions) and manipulated tree C status by physically blocking phloem transport at three girdling dates (GD)...
June 2017: Environmental and Experimental Botany
https://www.readbyqxmd.com/read/28391509/changes-in-environmental-conditions-modify-infection-kinetics-of-dairy-phages
#19
Delfina Zaburlin, Andrea Quiberoni, Diego Mercanti
Latent period, burst time, and burst size, kinetic parameters of phage infection characteristic of a given phage/host system, have been measured for a wide variety of lactic acid bacteria. However, most studies to date were conducted in optimal growth conditions of host bacteria and did not consider variations due to changes in external factors. In this work, we determined the effect of temperature, pH, and starvation on kinetic parameters of phages infecting Lactobacillus paracasei, Lactobacillus plantarum, and Leuconostoc mesenteroides...
April 8, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28391159/inhibitory-effects-of-quercetin-on-the-progression-of-liver-fibrosis-through-the-regulation-of-nf-%C3%B0%C2%BAb-i%C3%B0%C2%BAb%C3%AE-p38-mapk-and-bcl-2-bax-signaling
#20
Rong Wang, Hai Zhang, Yuanyuan Wang, Fuxing Song, Yongfang Yuan
Quercetin, a natural flavonoid, has been used as a nutritional supplement for its anti-inflammatory and antioxidative properties. Quercetin was reported to exhibit a wide range of pharmacological properties, including its effect on anti-hepatic fibrosis. However, the anti-fibrotic mechanisms of quercetin have not been well-characterized to date. This study aimed to investigate the protective effects of quercetin on carbon tetrachloride (CCl4)-induced liver fibrosis in rats and to clarify its anti-hepatofibrotic mechanisms...
April 6, 2017: International Immunopharmacology
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