The effect of metal interactions on phytochelatin production by marine phytoplankton has received little attention but yet is critical to understanding the biochemical this potentially important metal-binding ligand in field. Cd, Cu, and Zn additions were made singly combination three species laboratory cultures a natural algal assemblage from pristine coastal seawater. In intracellular varied with exposure demonstrated metal- concentration-dependent synergisms antagonisms. Most notably,...

A new synthesis of γ-rubromycin is presented through a oxidative, bisbenzannulated spiroketalization as key step which catalyzed by an in situ generated hypoiodite species, developed previously our group. This transformation has high efficiency and convenient conditions. efficient catalytic application for organohypoiodine reagents.

Glutathione is an abundant intracellular thiol that involved in the detoxification of reactive oxygen species generated presence light. We used short‐term continuous cultures Emiliania huxleyi and Thalassiosira pseudonana to show a diurnal light cycle causes glutathione undergo at least twofold variations, with maximum concentrations occurring during periods. Cysteine also appear vary E. similar extent, highest night. A complementary field study conducted Salt Pond Falmouth, Massachusetts,...

Transition-metal-catalyzed spiroketalization cyclization has been performed successfully and led to the first total synthesis of (±)-δ-rubromycin with a longest linear sequence 18 steps from commercially available guaiacol in 2.7% overall yield.

It was the aim of this study to investigate impact pulsed magnetic field (PMF) on ischemic myocardium, though it has been reported that PMF treatment is a safe and effective method facilitate bone cutaneous wound healing.In report, we describe in which 10 Hz 4 mT 15 6 used treat rats with myocardial infarction (MI).After 28 days treatment, treated exhibited decreased left ventricular end-diastolic pressure accelerated maximum dp/dt when compared untreated MI + groups. Additionally, capillary...

Brown tide algal blooms, caused by the excessive growth of Aureococcus anophagefferens, recur in several northeastern US coastal bays. Direct bloom control could alleviate ecological and economic damage associated with outbreak. This paper explored effectiveness safety natural chemical biocide hydrogen peroxide (H(2)O(2)) for brown control. Culture studies showed that H(2)O(2) at 1.6 mg L(-1) effectively eradicated high density A. anophagefferens within 24-hr, but no significant inhibition...

Single walled carbon nanotubes were carboxylated by microwave assisted acid oxidation (f-SWCNTs) and examined for their ecotoxicity on marine alga chlorophyte Dunaliella tertiolecta. Toxicity was evaluated based growth, photosynthetic activities, oxidative stress, intracellular glutathione in the concentration range of 0.1-20 mg/L f-SWCNT. Physical interactions between f-SWCNT using light microscopy scanning electron microscope. Increasing nanotube increased toxic effects where growth...

We modeled dissolved phytochelatin concentrations by studying its exudation from phytoplankton and removal seawater. Exudation rates were obtained experiments in which a marine diatom, Thalassiosira pseudonana, was grown Cd-containing medium. Dissolved the culture medium measured as function of time, first-order model fit to data derive rate constants. A synthetic standard used study natural The addition Cd or Cu, well decreasing temperature, significantly decreased rates. An acclimation...

Trace metals play important roles in regulating phytoplankton growth and could influence algal bloom development. Laboratory studies were conducted to evaluate the of environmentally relevant concentrations Cd, Cu, Ni, Zn on Aureococcus anophagefferens (brown tide) Results show that elevated Ni(2+) concentrations, e.g. those brown tide waters northeastern US, greatly stimulated A. (as compared control without Ni addition), yet, only low amounts dissolved sequestered, thus leaving excessive...

Abstract We report the study of nanoporous silica-iron oxide composite generated from diatom frustules as a highly active catalyst for photodegradation dye Rhodamine-6G. The unique architecture and high surface area diatoms were utilized to immobilize iron on their form composite. Photodegradation was carried out under 365-nm radiation observed using absorption spectrum dye. reaction found follow pseudo-first-order kinetics. results compared with commercially available granular oxide. rate...

The right half of (+)-pederin was synthesized through a convenient and efficient asymmetric synthesis in 14 steps with 8.3% overall yield. key step an iodine-induced heterocyclization to construct the pyran ring. chiral centers were constructed separately via allylation, substrate-controlled diastereoselective reactions, Sharpless dihydroxylation.

Objective To intervene to change the habits of hypertensive patients badthrough community nursing,improve blood pressure in withawareness hypertension,improve compliance behavior with hypertension,effective control and reduce occurrence complication.Methods 90 hypertension thecommunity center take medication for patients,were randomly divided into observation group 45 cases a cases.The was given conventional treatment hypertension.45 give patient family health education,changing...