As a follow-up to earlier reported works on the phytochemical study of some isolated bioactive compounds from root and bark Entandrophragma congoënse as potent anti-plasmodium drugs (Happi et. al.2005), were tested in vitro for antiplasmodial cytotoxicity but no insight was given into binding affinities these compounds, ADMET (Absorption, Distribution, Metabolism, Excretion Toxicity), drug-like...

In this paper, we present a novel unsupervised feature selection method termed robust matrix factorization with adaptive structure learning (RMFRASL), which can select discriminative features from large amount of multimedia data to improve the performance classification and clustering tasks. RMFRASL integrates three models (robust factorization, learning, regularization) into unified framework....

We determined the contribution of the three major prokaryotic groups (Bacteria, Crenarchaeota, and Euryarchaeota) on the uptake of Dand L-aspartic acid (Asp) in the major water masses of the North Atlantic (from 100to 4,000-m depth) with the use of microautoradiography combined with catalyzed reporter deposition fluorescence in situ hybridization (MICRO-CARD-FISH). The percentage of prokaryotic...

A full understanding of the biogeochemical cycling of silica in the North Atlantic is hampered by a lack of estimates of silica uptake by phytoplankton. We applied the 32Si radiotracer incubation technique to determine silica uptake rates at 10 sites during the UK-(Natural Environment Research Council) Faroes–Iceland–Scotland hydrographic and environmental survey (FISHES) cruise in the Northeas...

The Choptank and Patuxent tributaries of Chesapeake Bay have become eutrophic over the last 50–100 years. Systematic monitoring of nutrient inputs began in ;1970, and there have been 2–5-fold increases in nitrogen (N) and phosphorus (P) inputs during 1970–2004 due to sewage discharges, fertilizer applications, atmospheric deposition, and changes in land use. Hydrochemical modeling and land-use ...

Phytoplankton carbon and particulate organic carbon (POC), nitrogen (PON), and phosphorus (POP) (POC : PON : POP) were analyzed in 109 temperate lakes covering a wide span in productivity and other key parameters. Seasonal means of total POC (four samples) ranged from 206 to 7160 mg C L21, with a grand mean of 960 mg C L21, whereas estimated phytoplankton C ranged 12 to 1,770 mg C L21, with a m...

A strategy for designing probes based on protection-deprotection chemistry involving fluoresceins and their benzenesulfonyl (BES) derivatives has led to the development of a much more practical superoxide (O(2) (-.)) probe than the previously reported bis(2,4-dinitro-BES) tetrafluorofluorescein (6 a). Examination of various BES derivatives, developed from the starting point of the prototype pro...

This study documents the changes in nutrient fluxes associated with internal tidal bores arriving on Florida Keys coral reefs and points to biological use of subthermocline nitrate brought onshore by this mechanism. Internal bores on Conch Reef, Florida Keys, are associated with concentrations of 1.0–4.0 mmol L21 nitrate (NO ) and 0.1–0.3 3 mmol L21 soluble reactive phosphate (SRP) and onshore ...

The oxygen dynamics in the rhizosphere of Zostera marina was studied by use of planar optodes. Oxygen leakage to the rhizosphere was restricted to the root tip and extended only up to ;8 mm up along the root. The oxic sediment volume around the roots increased linearly with irradiance in the interval of 0–250 mmol photons m22 s21, but the leakage rate saturated at the maximum irradiance of 500 ...