Search Within
Filtros aplicados
Exibindo 1-30 of 225 resultados for "


" no prazo de Papéis
Mohammad Hossein Sowlat et al.
Reviews of environmental contamination and toxicology, 230, 1-34 (2014-03-13)
This systematic review of high-quality, relevant original research articles existing in the literature was conducted to comprehensively explore the efficiency of Hg11 capture from stack emissions by sulfur-impregnated vs. virgin ACs. Our systematic overview suggested that significantly higher amounts of
Gyeong Jin Lee et al.
Macromolecular bioscience, 15(11), 1595-1604 (2015-07-18)
Crosslinked bioreducible polypropylenimine-cystaminebisacrylamides (PPI-CBAs) were synthesized for gene delivery systems. They formed nano-sized polyplexes with high stability even in reducing condition probably due to the re-crosslinking. PPI-CBAs displayed high transfection efficiency comparable to PEI25k in serum condition. However, cytotoxicity increase
Margret Sauter et al.
The Biochemical journal, 451(2), 145-154 (2013-03-29)
Both Met (methionine) and SAM (S-adenosylmethionine), the activated form of Met, participate in a number of essential metabolic pathways in plants. The subcellular compartmentalization of Met fluxes will be discussed in the present review with respect to regulation and communication
Xiao Liang et al.
Nature communications, 6, 5682-5682 (2015-01-07)
The lithium-sulfur battery is receiving intense interest because its theoretical energy density exceeds that of lithium-ion batteries at much lower cost, but practical applications are still hindered by capacity decay caused by the polysulfide shuttle. Here we report a strategy
K Suresh Kumar Reddy et al.
Environmental technology, 35(1-4), 18-26 (2014-03-08)
The presence of elemental mercury in wellhead natural gas is an important industrial problem, since even low levels of mercury can damage cryogenic aluminium heat exchangers and other plant equipment. Mercury present in the natural gas stream will also dramatically
Y Chen et al.
Oncogene, 34(29), 3839-3847 (2014-10-07)
Although previous studies suggest that myeloid zinc-finger 1 (MZF-1) is a multifaceted transcription factor that may function as either an oncogene or a tumor suppressor, the molecular bases determining its different traits remain elusive. Increasing evidence suggests that disorders in
Zhen Yan et al.
Biochimica et biophysica acta, 1844(4), 736-743 (2014-02-05)
Heterodimeric 2-oxoacid:ferredoxin oxidoreductase (OFOR) from Sulfolobus tokodaii (StOFOR) has only one [4Fe-4S]²⁺ cluster, ligated by 4 Cys residues, C12, C15, C46, and C197. The enzyme has no other Cys. To elucidate the role of these Cys residues in holding of
Graziella Patrício Pereira Garcia et al.
Environmental technology, 36(17), 2177-2189 (2015-03-05)
We developed a biological sulphide oxidation system and evaluated two reactors (shaped similar to the settler compartment of an up-flow anaerobic sludge blanket [UASB] reactor) with different support materials for biomass retention: polypropylene rings and polyurethane foam. The start-up reaction
Xingwen Yu et al.
ACS applied materials & interfaces, 7(30), 16625-16631 (2015-07-15)
Lithium-sulfur (Li-S) batteries are receiving great attention as the most promising next-generation power source with significantly high charge-storage capacity. However, the implementation of Li-S batteries is hampered by a critical challenge because of the soluble nature of the intermediate polysulfide
Pallavi Thaplyal et al.
Biochemistry, 52(37), 6499-6514 (2013-09-05)
Metal ion and nucleobase catalysis are important for ribozyme mechanism, but the extent to which they cooperate is unclear. A crystal structure of the hepatitis delta virus (HDV) ribozyme suggested that the pro-RP oxygen at the scissile phosphate directly coordinates
O Carrión et al.
Nature communications, 6, 6579-6579 (2015-03-26)
The volatile compound dimethylsulphide (DMS) is important in climate regulation, the sulphur cycle and signalling to higher organisms. Microbial catabolism of the marine osmolyte dimethylsulphoniopropionate (DMSP) is thought to be the major biological process generating DMS. Here we report the
Andrew Kruegel et al.
Rapid communications in mass spectrometry : RCM, 27(7), 763-766 (2013-03-16)
The utility of elemental sulfur as a matrix for inorganic salts such as CsI, AgI, and KI was investigated because the conventional matrices deployed to generate gaseous ions from organic compounds, upon irradiation with a laser beam, are not suitable
Le Gao et al.
Journal of bacteriology, 197(16), 2642-2652 (2015-05-28)
Thermococcus kodakarensis grows optimally at 85°C and possesses two chaperonins, cold-inducible CpkA and heat-inducible CpkB, which are involved in adaptation to low and high temperatures, respectively. The two chaperonins share a high sequence identity (77%), except in their C-terminal regions.
Nicholas D Lanz et al.
Biochimica et biophysica acta, 1824(11), 1196-1212 (2012-08-01)
Radical SAM (RS) enzymes use a 5'-deoxyadenosyl 5'-radical generated from a reductive cleavage of S-adenosyl-l-methionine to catalyze over 40 distinct reaction types. A distinguishing feature of these enzymes is a [4Fe-4S] cluster to which each of three iron ions is
Farhad Forouhar et al.
Nature chemical biology, 9(5), 333-338 (2013-04-02)
How living organisms create carbon-sulfur bonds during the biosynthesis of critical sulfur-containing compounds is still poorly understood. The methylthiotransferases MiaB and RimO catalyze sulfur insertion into tRNAs and ribosomal protein S12, respectively. Both belong to a subgroup of radical-S-adenosylmethionine (radical-SAM)
Tracy C MacDonald et al.
Metallomics : integrated biometal science, 7(8), 1247-1255 (2015-07-17)
The compounds of mercury can be more toxic than those of any other non-radioactive heavy element. Despite this, environmental mercury pollution and human exposure to mercury are widespread, and are increasing. While the unusual ability of selenium to cancel the
Georgios Rotas et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 20(45), 14729-14735 (2014-09-17)
Azafullerene (C59 N) was functionalized using a Mannich-type reaction and then subsequently condensed with lipoic acid to yield dithiolane-modified C59 N. In the following step, the extended dithiolane moiety from the C59 N core was utilized to decorate the azafullerene
Shancheng Zhao et al.
Carbohydrate research, 401, 32-38 (2014-12-03)
Heparan sulfate is a component of the extracellular matrix (ECM) that modulates individual development and cell growth through its interaction with growth factors. Structurally, heparan sulfate consists of repeating linear sulfated poly-anionic disaccharide structures. The K5 polysaccharide has the same
Y Qiu et al.
Journal of dairy science, 98(9), 5862-5873 (2015-07-21)
The residual annatto colorant in fluid Cheddar cheese whey is bleached to provide a neutral-colored final product. Currently, hydrogen peroxide (HP) and benzoyl peroxide are used for bleaching liquid whey. However, previous studies have shown that chemical bleaching causes off-flavor
Sungun Wi et al.
Nanoscale research letters, 10, 204-204 (2015-05-16)
The reduced graphene oxide (RGO)/carbon double-coated 3-D porous ZnO aggregates (RGO/C/ZnO) have been successfully synthesized as anode materials for Li-ion batteries with excellent cyclability and rate capability. The mesoporous ZnO aggregates prepared by a simple solvothermal method are sequentially modified
Shen-Yi Chen et al.
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering, 48(9), 1094-1104 (2013-04-12)
The bioleaching process is considered to be more efficient and environmentally friendly than conventional technologies for removal of heavy metals from waste sludge. The objective of this study was to develop an optimal thermophilic bioleaching process for the treatment of
E C Rowe et al.
Environmental pollution (Barking, Essex : 1987), 184, 271-282 (2013-10-01)
Increases in dissolved organic carbon (DOC) fluxes may relate to changes in sulphur and nitrogen pollution. We integrated existing models of vegetation growth and soil organic matter turnover, acid-base dynamics, and organic matter mobility, to form the 'MADOC' model. After
Hanumantharao Paritala et al.
Infectious disorders drug targets, 13(2), 85-115 (2013-07-03)
The identification of new antibacterial targets is urgently needed to address multidrug resistant and latent tuberculosis infection. Sulfur metabolic pathways are essential for survival and the expression of virulence in many pathogenic bacteria, including Mycobacterium tuberculosis. In addition, microbial sulfur
Eagleson M.
Concise Encyclopedia Chemistry, 199-199 (1994)
Wen-Tao Xu et al.
ChemSusChem, 8(17), 2892-2901 (2015-06-17)
The self-discharge of a lithium-sulfur cell decreases the shelf-life of the battery and is one of the bottlenecks that hinders its practical applications. New insights into both the internal chemical reactions in a lithium-sulfur system and effective routes to retard
Jianbing Zhang et al.
ACS nano, 9(7), 7151-7163 (2015-07-15)
We developed a strategy for producing quasi-spherical nanocrystals of anisotropic heterostructures of Cd/Pb chalcogenides. The nanostructures are fabricated via a controlled cation exchange reaction where the Cd(2+) cation is exchanged for the Pb(2+) cation. The cation exchange reaction is thermally
Angshuman Bagchi
Gene, 521(1), 207-210 (2013-03-19)
One of the oldest known gene clusters that are involved in biological oxidation processes is the sox operon. This operon is present in different microbial species. In the present study an attempt has been made to analyze the probable structural
JianCai Zhu et al.
Journal of agricultural and food chemistry, 63(34), 7499-7510 (2015-08-11)
The aroma profile of oolong tea infusions (Dongdingwulong, DDWL; Tieguanyin, TGY; Dahongpao, DHP) were investigated in this study. Gas chromatography-olfactometry (GC-O) with the method of aroma intensity (AI) was employed to investigate the aroma-active compounds in tea infusions. The results
ChangCai Liu et al.
Analytical and bioanalytical chemistry, 407(23), 7037-7046 (2015-07-15)
Sulfur mustard (HD) adduct to human serum albumin (ALB) at Cys-34 residue has become an important and long-term retrospective biomarker of HD exposure. Here, a novel, sensitive, and convenient approach for retrospective quantification of HD concentration exposed to plasma was
Amit S Pawbake et al.
ACS applied materials & interfaces, 7(43), 24185-24190 (2015-10-16)
Titanium trisulfide (TiS3) has recently attracted the interest of the 2D community because it presents a direct bandgap of ∼1.0 eV, shows remarkable photoresponse, and has a predicted carrier mobility up to 10000 cm(2) V(-1) s(-1). However, a study of
Página 1 de 8
Página 1 de 8