Search Results
Results 401 - 450 of 1380
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Hosoya Takahiro - - 2012
Three new trichostatin analogues, JBIR-109 (1), JBIR-110 (2), and JBIR-111 (3), were isolated from the culture of the marine sponge-derived Streptomyces sp. strain RM72, together with trichostatin A (4) and trichostatic acid (5). The planar structures of 1-3 were determined on the basis of extensive NMR and MS analyses. In ...
Sudjaroen Yuttana - - 2012
Longan (Dimocarpus longan Lour, syn. Euphoria longan Lam.) represents an important fruit in Northern Thailand and has significant economic impact. The fruit is either consumed fresh or as commercially prepared dried and canned products. The canning industry in Thailand produces considerable quantities of waste products, in particular Longan seeds. Because ...
Munyololo Muganza - - 2012
Two further variations of the Ferrier-type allylic rearrangements of 1,2-cyclopropanated glucose derivatives bearing an acetoxylated carbon at the 1'-position are described. In the first, treatment of the cyclopropanated sugar with a nucleophile (ROH, PhSH, azide) and Lewis acid (BF(3)·Et(2)O or Al(OTf)(3)), gives 2-C-vinyl glucosides in good yields and α-selectivities. Alternatively, ...
Nagoba Basavraj S - - 2012
A prospective study was carried out to assess the role of citric acid as a sole antimicrobial agent in the management of lepromatous ulcers. Thirty-four known cases of lepromatous ulcers not responding to conventional antibiotic therapies for long duration were investigated for culture and susceptibility studies. Staphylococcus aureus (25·00%) and ...
Rohof W O - - 2012
BackgroundThe risk for acidic reflux is mainly determined by the position of the gastric acid pocket. It was hypothesised that compounds affecting proximal stomach tone might reduce gastro-oesophageal reflux by changing the acid pocket position.ObjectiveTo study the effect of azithromycin (Azi) on acid pocket position and acid exposure in patients ...
Sands Jeffrey J - - 2012
Background: Citrasate®, citric acid dialysate (CD), contains 2.4 mEq of citric acid (citrate), instead of acetic acid (acetate) as in standard bicarbonate dialysate. Previous studies suggest CD may improve dialysis adequacy and decrease heparin requirements, presumably due to nonsystemic anticoagulant effects in the dialyzer. Methods: We prospectively evaluated 277 hemodialysis ...
Jöris Monique M - - 2012
Previously, we showed that with an increasing number of amino acid differences in single HLA class I-mismatched molecules, the probability of T cell alloreactivity decreases. It is unlikely that every amino acid difference will affect T cell alloreactivity in a similar way; we hypothesized that the effect of an amino ...
Rahbar Nahid - - 2012
OBJECTIVE: To examine whether dietary supplementation with omega-3 fatty acids relieved symptoms of primary dysmenorrhea. METHODS: Women aged 18-22years with primary dysmenorrhea were enrolled in a double-blind crossover study. Women assigned to group 1 (n=47) received 1 omega-3 capsule daily for 3months, followed by placebo for 3months. Women in group ...
Naoulou Becky - - 2012
Objective. To evaluate the efficacy of tranexamic acid in the treatment of idiopathic and non-functional heavy menstrual bleeding. Design. Systematic review. Population: Women with diagnosis of idiopathic and non-functional heavy menstrual bleeding treated with tranexamic acid. Method. Electronic searches were conducted in literature database up to February 2011 by 2 ...
Arunadevi N - - 2012
The title molecular salts, N(2)H(5)(+)·C(7)H(5)O(3)(-)·C(7)H(6)O(3) and N(2)H(5)(+)·C(11)H(7)O(3)(-)·C(11)H(8)O(3), are acid adducts containing a hydrazinium cation, one molecule of a deprotonated acid and one molecule of a neutral acid. The two compounds contain essentially identical hydrogen-bond networks between the hydrazinium cation and the acid molecules, which define closely comparable two-dimensional layers in ...
Tomshich S V - - 2012
The O-specific polysaccharide was obtained by mild acid degradation of the lipopolysaccharide of the marine bacterium Arenibacter palladensis type strain KMM 3961(T) and studied by chemical methods and (1)H and (13)C NMR spectroscopy including 2D COSY, TOCSY, (1)H,(13)C HSQC, and HMBC experiments. The polysaccharide was shown to consist of tetrasaccharide ...
Zhang Yong-Hong - - 2012
A new chiro-inositol ester, 4-hydroxyphenylacetyl-3-d-chiro-inositol ester (1), was isolated from the whole plants of Prenanthes macrophylla Franch., along with 10 known compounds, 4-hydroxyphenylacetic acid (2), trans-ethyl caffeate (3), cis-ethyl caffeate (4), protocatechualdehyde (5), luteolin (6), luteolin-7-O-β-d-glucoside (7), 15-hydroxy-2-oxo-guai-3-en-1α,5α,6β,7α,10α,11βH-12,6-olide (8), 15-glucopyranosyloxy-2-oxo-guaia-3,11(13)-dien-1α,5α,6β,7α,10αH-12,6-olide (9), ursolic acid (10), and oleanolic acid (11). Their structures ...
Aoki Syota - - 2012
Six new secoiridoid constituents, named isoligustrosidic acid (1), 6'-O-trans-cinnamoyl 8-epikingisidic acid (2), 6'-O-cis-cinnamoyl 8-epikingisidic acid (3), oleopolynuzhenide A (4), nuzhenals A (5) and B (6) were isolated from the dried fruits of Ligustrum lucidum AIT. Their structures were established on the basis of spectral and chemical data.
Salinero Carmen - - 2012
<em>Camellia japonica </em>(CJ) has oil-rich seeds, but the study of these oils has received little attention and has mainly focused only on their health properties. In the present work the relative composition of the fatty acid (FA) components of the triglycerides in cold-pressed oil from CJ is studied by <sup>1</sup>H-NMR. ...
Yeddes Nizar - - 2012
The fatty acids profiles of Tunisian Opuntia ficus indica seeds (spiny and thornless form) were investigated. Results of supercritical carbon dioxide (SC-CO(2)) and soxhlet n-hexane extract were compared. Quantitatively, the better yield was obtained through soxhlet n-hexane: 10.32% (spiny) and 8.91% (thornless) against 3.4% (spiny) and 1.94% (thornless) by SC-CO(2) ...
Wu Haifeng - - 2012
From the whole plant of <em>Sarcandra glabra</em>,<strong> </strong>a new phenolic acid glycoside, benzyl 2-β-glucopyranosyloxybenzoate (<strong>1</strong>), together with seven known compounds including eleutheroside B<sub>1</sub> (<strong>2</strong>), 5-<em>O</em>-caffeoylshikimic acid (<strong>3</strong>), (-)-(7<em>S</em>, 8<em>R</em>)-dihydrodehydro-diconiferyl alcohol (<strong>4</strong>), (-)-(7<em>S</em>, 8<em>R</em>)-dihydrodehydrodiconiferyl alcohol 9-, 9'- and 4-<em>O</em>-â-D-glucopyranoside (<strong>5</strong>-<strong>7</strong>), and (-)-(7<em>S</em>, 8<em>R</em>)-5-methoxydihydrodehydrodiconiferyl alcohol 4-<em>O</em>-β-D-glucopyranoside (<strong>8</strong>) was isolated. Their structures were ...
She Gaimei - - 2012
Dried sclerotia of Wolfiporia extensa (Polyporaceae) is used to invigorate the spleen and to tranquilize the mind in Chinese herbal medicine. Lanostane-type triterpene acids were regard as major secondary metabolites from dried sclerotia of W. extensa. Three new lanostane-type triterpene acids, 3-epi-benzoyloxyl-dehydrotumulosic acid (1), 3-epi-(3'-O-methyl malonyloxy)-dehydrotumulosic acid (2) and 3-epi-(3'-hydroxy-3'-methylglutaryloxyl)-dehydrotumulosic ...
Mulopo J - - 2012
The conversion of steelmaking slag (a waste product of the steelmaking process) to calcium carbonate (CaCO(3)) was tested using hydrochloric acid, ammonium hydroxide and carbon dioxide via a pH-swing process. Batch reactors were used to assess the technical feasibility of calcium carbonate recovery and its use for pre-treatment of acid ...
Jala Ram Chandra Reddy - - 2012
Structured lipids (SL) are broadly referred to as modified or synthetic oils and fats or lipids with functional or pharmaceutical applications. Some structured lipids, such as triglycerides that contain both long-chain (mainly essential) fatty acids and medium- or short-chain fatty acids and also artificial products that mimic the structure of ...
Ji De - - 2012
A new iridoid glycoside, named loganic acid ethyl ester (1), together with five known compounds: chlorogenic acid (2), caffeic acid (3), loganin (4), cantleyoside (5) and syringaresinol-4',4''-O-bis-β-D-glucoside (6) were isolated from the roots of Dipsacus asper. The structure of compound 1 was elucidated on the basis of detailed spectroscopic analyses. ...
Zhu Chen-Chen - - 2012
A new triterpenoid saponin and fourteen known triterpenoids were isolated from the methanol extract of the stems and leaves of Callicarpa integerrima Champ, which is used in Chinese folk medicine for stopping bleeding, expelling the wind, dissipating stagnation, and treating scrofula, by using various chromatographies, such as silica gel, Sephadex ...
Hazar-Yoruc Binnaz - - 2012
This study investigated the erosion kinetics of conventional and resin-modified glass-ionomer luting cements in acidic buffer solutions as a function of time. Disc shaped specimens were prepared from conventional (Ketac-Cem: KTC) and resin-modified glass ionomer cements (Fuji Plus: FP) and immersed in three acidic buffer solutions (0.01 M) namely, acetic ...
Almeida Verônica M - - 2012
Naringin is an important flavanone with several biological activities, including antioxidant action. However, this compound shows low solubility in lipophilic preparations, such as is used in the cosmetic and food industries. One way to solve this problem is to add fatty acids to the flavonoid sugar unit using immobilized lipase. ...
Kinuthia Esther W - - 2012
A new triterpenoid, 3-oxo-22alpha-hydroxy-olean-12-en-28-oic acid (1), oleanolic acid (2) and a known iridoid, 10-hydroxy-1-oxo-7-iriden-11-oic acid methyl ester (3) have been isolated from the dichloromethane extract of the dried seeds of Gardenia volkensii. Their structures were established by 1D and 2D NMR spectroscopic and MS methods.
Hadibarata Tony - - 2012
Armillaria sp. F022, a white rot fungus isolated from tropical rain forest (Samarinda, Indonesia) was used to biodegrade naphthalene in cultured medium. Transformation of naphthalene by Armillaria sp. F022 which is able to use naphthalene, a two ring-polycyclic aromatic hydrocarbon (PAH) as a source of carbon and energy was investigated. ...
Masini Brendan D - - 2012
This study investigates a potential site of bacterial adherence, the implant surface, comparing titanium, poly-L-lactic acid (PLLA), and composite hydroxyapatite and poly-L-lactic acid (PLLA-HA) interference screws using a bioluminescent in vitro model. Interference screws of three materials, titanium (Arthrex, Naples, FL), bioabsorbable poly-L-lactic acid (BIORCI, Smith & Nephew, Andover, MA), ...
Kato Massuo Jorge - - 2012
The major secondary metabolites and fatty acids occurring in the seeds of Virola surinamensis were monitored by GC-MS during germination and seedling development. The role as carbon source for seedling development was indicated considering that both classes of compounds were similarly consumed in the seeds and that no selective consumption ...
Sajid Zahid Iqbal - - 2012
This study appraises the antioxidant and antimicrobial attributes of various solvent extracts (absolute methanol, aqueous methanol, absolute ethanol, aqueous ethanol, absolute acetone, aqueous acetone, and deionized water) from bark, leaves and seeds of Pongamia pinnata (L.) Pierre. Maximum extraction yield of antioxidant components from bark (16.31%), leaves (11.42%) and seeds ...
Restivo J - - 2012
Carbon nanofibres (CNFs) were grown on different macrostructured supports such as cordierite monoliths, carbon felts and sintered metal fibres. The resulting composites exhibited excellent resistance to attrition/corrosion and its porosity is mainly due to mesoporous structures. The CNF/structured materials were tested in the ozonation of oxalic acid in a conventional ...
Luo Zhen-Mei - - 2012
Fuzhuan brick tea, a kind of dark tea consumed mainly in the border regions of Southwestern and Northwestern China since the 1860s, is produced from the leaves of Camellia sinensis var. sinensis by microbial fermentation. From this special fermented tea, a new norisoprenoid, 3R,9R-oxido-5-megastigmene, was isolated, together with α-linolenic acid, ...
Huang Yun-Ting - - 2012
Four new endiandric acid analogues, tsangibeilin C (1), tsangibeilin D (2), tricyclotsangibeilin (3) and endiandric acid M (4), one new lignan, beilschminol B (5) and two new sesquiterpenes, (+)-5-hydroxybarbatenal (6) and (4R,5R)-4,5-dihydroxycaryophyll-8(13)-ene (7), together with four known compounds (8-11), were isolated from the roots of Beilschmiedia tsangii (Lauraceae). The structures ...
Ma Hang - - 2012
Twelve compounds were isolated from Winged Sumac (Rhus copallinum) fruit and their structures were elucidated on the basis of NMR and mass spectral data. The isolates included a new galloyl derivative, (R)-galloyl malic acid dimethyl ester (1), and eleven known compounds, gallic acid (2), methyl gallate (3), glucogallin (4), methyl ...
Yang Liu - - 2012
To study the chemical constituents of the roots of Achyranthes bidentata Bl. The chemical constituents were isolated and purified by macroporous adsorptive resin D101, silica gel, and ODS column chromatographies and preparetive HPLC. Their structures were elucidated on the basis of 1D and 2D NMR analyses. Two feruloyl tyramine glycosides ...
Feng Xueyang - - 2012
C-isotope labeling is a commonly used technique for determining and quantifying pathways in microorganisms under various growth conditions. The experimental protocol consists of feeding the cell with a composition-defined substrate and measuring isotopic labeling patterns in the synthesized metabolites (often the amino acids). Not only can the labeling information be ...
Touafek Ouassila - - 2012
Three long-chain unsaturated esters (1-3), a fatty acid (4), a fatty ester (5), phytone (6) and a phloroglucinol (hyperfoliatin) (7) were isolated from the light petroleum extract of the endemic species Hypericum tomentosum L. (Clusiaceae). Compound 2, 8,10,13-trimethyltetradecanoic acid (2E)-3-methylhexadec-2-enyl ester, which we named tomentosate, is reported for the first ...
Al-Majid Abdullah Mohammed A - - 2012
The synthesis of several novel chiral phosphoramidite ligands (L1-L8) with C(2) symmetric, pseudo C(2) symmetric secondary amines and chiral Brønsted acids 1a,b has been achieved. These chiral auxiliaries were obtained from commercially available d-mannitol, and secondary amines in moderate to excellent yields. Excellent diastereoselectivites of ten chiral auxiliaries were obtained. ...
Sun Wei - - 2012
Guided by a hemostasis bioassay, seven terpene glycosides were isolated from the roots of <em>Sanguisorba officinalis</em> L. by silica gel column chromatography and preparative HPLC. On the grounds of chemical and spectroscopic methods, their structures were identified as citronellol-1-<em>O</em>-α-l-arabinofuranosyl-(1→6)-β-d-glucopyranoside (<strong>1</strong>), geraniol-1-<em>O</em>-α-l-arabinofuranosyl-(1→6)-β-d-glucopyranoside (<strong>2</strong>), geraniol-1-<em>O</em>-α-l-arabinopyranosyl-(1→6)-β-d-glucopyranoside (<strong>3</strong>), 3β-[(α-l-arabinopyranosyl)oxy]-19α-hydroxyolean-12-en-28-oic acid 28-β-d-glucopyranoside (<strong>4</strong>), 3β-[(α-l-arabinopyranosyl)-oxy]-19α-hydroxyurs-12-en-28-oic acid ...
Ono Masateru - - 2012
Three new resin glycosides, quamoclins V (1), VI (2), and VII (3) and a new tetrahydropyran derivative, quamopyran (4), were isolated from the seeds of Quamoclit pennata BOJER (Convolvulaceae). The chemical structures of these compounds were determined primarily on the basis of spectroscopic data. The carboxyl group of the aglycone, ...
Fraga Braulio M - - 2012
The biotransformation of 13a,17-dihydroxystemodane (3) with the fungus Cephalosporium aphidicola afforded 13a,17,18-trihydroxystemodane (4), 3b,13a,17-tri-hydroxystemodane (5), 13a,17-dihydroxy-stemodan-18-oic acid (6), 3b,11β,13a,17-tetra-hydroxystemodane (7), 11β,13a,17,18-tetrahydroxystemodane (8) and 3b,13a,17,18-tetra-hydroxystemodane (9). The hydroxylation at C-18 of the substrate points to a biosynthetically-directed transformation, because aphidicolin (2) is hydroxylated at this carbon. However, the C-3(b) and C-11(b) ...
Lee Duckhee - - 2012
Direct benzoylation of the two hydroxyl groups on chitosan was achieved using a phosphoryl mixed anhydride system, derived from trifluoroacetic anhydride (TFAA), benzoic acids (BAs), and phosphoric acid (PA). The reaction is operated as a one pot process under mild conditions that does not require neither an inert atmosphere nor ...
Tengeiji Atsushi - - 2012
We report a new method for the preparation of chiral 2-aryl-2-fluoropropanoic acids, including 2-fluoroibuprofen, a fluorinated analogue of non-steroidal anti-inflammatory drugs (NSAIDs), by the kinetic resolution of racemic 2-aryl-2-fluoropropanoic acids using enantioselective esterification. By applying pivalic anhydride (Piv<sub>2</sub>O) as a coupling agent, bis(<em>α</em>-naphthyl)methanol [(<em>α</em>-Np)<sub>2</sub>CHOH] as an achiral alcohol, and (+)-benzotetramisole ...
Mateu Elsa - - 2012
From the stems of Croton micans Sw., five new 3,4-seco-ent-kaurene dimers: micansinoic acid (1), isomicansinoic acid (2), and the dimethyl (3), monomethyl (4) and monoethyl ester (5) of micansinoic acid were isolated. The structures of the new compounds were elucidated by spectroscopic data interpretation, mainly 1D and 2D NMR experiments ...
Batitucci Roberta Grasselli - - 2012
The purpose of this in vitro study was to quantify the alterations on human root dentin permeability after exposure to different acid fruit juices and to evaluate the effect of toothbrushing with electric or sonic toothbrush after acid exposure. The root dentin of 50 extracted third molars was exposed with ...
Pan Wen-Juan - - 2012
Supercritical carbon dioxide (SC-CO(2)) extraction of oil from oak silkworm pupae was performed in the present research. Response surface methodology (RSM) was applied to optimize the parameters of SC-CO(2) extraction, including extraction pressure, temperature, time and CO(2) flow rate on the yield of oak silkworm pupal oil (OSPO). The optimal ...
Mohammadi Z - - 2012
The purpose of this study was to assess the in vitro effect of ascorbic acid on the antibacterial substantivity of Tetraclean in bovine root dentin pretreated with sodium hypochlorite (NaOCl). Eighty dentin tubes prepared from bovine incisor teeth were infected with Enterococcus faecalis for 14 days. The specimens were divided ...
Noda Shuhei - - 2012
Benzoic acid is one of the most useful aromatic compounds. Despite its versatility and simple structure, benzoic acid production using microbes has not been reported previously. Streptomyces are aerobic, Gram-positive, mycelia-forming soil bacteria, and are known to produce various kinds of antibiotics composed of many aromatic residues. S. maritimus possess ...
Can Güven Selçuk - - 2012
Using a conditioning paradigm, the olfactory sensitivity of CD-1 mice for a homologous series of aliphatic n-carboxylic acids (ethanoic acid to n-octanoic acid) and several of their isomeric forms was investigated. With all 14 odorants, the animals significantly discriminated concentrations as low as 0.03 ppm (parts per million) from the ...
Kumar Rohitesh - - 2012
A new tetramic acid glycoside, aurantoside K, was isolated from a marine sponge belonging to the genus Melophlus. The structure of the compound was elucidated on the basis of spectroscopic analysis (¹H NMR, ¹H-¹H COSY, HSQC, and HMBC, as well as high-resolution ESILCMS). Aurantoside K did not show any significant ...
Gladyshev Michail I - - 2012
We studied four-link food chain, periphytic microalgae and water moss (producers), trichopteran larvae (consumers I), gammarids (omnivorous--consumers II) and Siberian grayling (consumers III) at a littoral site of the Yenisei River on the basis of three years monthly sampling. Analysis of bulk carbon stable isotopes and compound specific isotope analysis ...
Gluud Lise Lotte - - 2012
Tranexamic acid reduces haemorrhage through its antifibrinolytic effects. In a previous version of the present review, we found that tranexamic acid may reduce mortality. The present review includes updated searches of randomised trials on tranexamic acid versus placebo, cimetidine or lansoprazole. To assess the effects of tranexamic acid for upper ...
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