Search Results
Results 151 - 200 of 1132
1 2 3 4 5 6 7 8 9 10 >
Fan-Chiang Ho-Ju - - 2010
Sugar and nonvolatile acid analyses were conducted on 52 samples of blackberries (Rubus spp), the objective being to develop a compositional database for evaluating authenticity and quality. Brix ranged from 6.88 to 16.83, with a mean of 10.82. Titratable acidity ranged from 0.52 to 2.24 g citric acid/100 mL, with ...
Dafny-Yalin Mery - - 2010
The current study describes differences in pomegranate fruit size and aril weight of 29 accessions grown in Israel. The contents of sugars and organic acids in their aril juices and peel homogenates, as well as color parameters, were determined. While the levels of total soluble solids (TSS) and soluble sugars ...
Rymowicz Waldemar - - 2010
Yarrowia lipolytica A-101-1.22 produces high citric acid (112 g l(-1)) with a yield of 0.6 g g(-1) and a productivity of 0.71 g l(-1) h(-1) during batch cultivation in the medium with glycerol-containing waste of biodiesel industry. However, it was observed that the specific citric acid production rate, which was ...
Cai Menghao - - 2010
Aspergiolide A production enhancement by citrate and its effects on growth and sexual development of marine-derived fungus Aspergillus glaucus HB1-19 were investigated. In agar plate culture, 15 mM citric acid decreased colony radial growth and aspergiolide A production by 31.5% and 23.0%, respectively. It also improved sexual cleistothecium formation by ...
Thai Van Viet - - 2010
In this study, an injectable bone substitute (IBS) consisting of citric acid, chitosan, and hydroxyl propyl methyl cellulose (HPMC) as the liquid phase and tetra calcium phosphate (TTCP), dicalcium phosphate dihydrate (DCPD) and calcium sulfate dehydrate (CSD, CaSO4 x 2H2O) powders as the solid phase, were fabricated. Two groups were ...
Karthikeyan Alagarsamy - - 2010
The growing demand for citric acid and the current need for alternative sources have encouraged biotechnologists to search for novel and economical substrates. Koji fermentation was conducted using the peels of banana (Musa acuminata) as an inexpensive substrate for the production of citric acid using Aspergillus niger. Various crucial parameters ...
Honeychurch Kevin C - - 2010
Cobalt phthalocyanine-modified screen-printed carbon electrodes (CoPC-SPCEs) have been investigated as disposable sensors for the measurement of citric acid. The analyte was found to undergo an electrocatalytic oxidation process involving the Co(2+)/Co(3+) redox couple. Calibration plots were found to be linear in the range 2 mM to 2.0 M; replicate determinations ...
Lim Byungkwon - - 2010
This paper describes the synthesis of Pd-Au bimetallic nanocrystals with controlled morphologies via a one-step seeded-growth method. Two different reducing agents, namely, L-ascorbic acid and citric acid, were utilized for the reduction of HAuCl(4) in an aqueous solution to control the overgrowth of Au on cubic Pd seeds. When L-ascorbic ...
Pineño Oskar - - 2010
Rats given presentations of a citric acid solution while recovering from LiCl-induced illness (i.e., a "medicine effect" treatment) subsequently drank more of an aversively conditioned NaCl solution at test, when the NaCl presentation was immediately preceded by citric acid. That is, citric acid passed a summation test of conditioned inhibition. ...
Zhao Shimin S School of Life Sciences, Fudan University, Shanghai 20032, - - 2010
Protein lysine acetylation has emerged as a key posttranslational modification in cellular regulation, in particular through the modification of histones and nuclear transcription regulators. We show that lysine acetylation is a prevalent modification in enzymes that catalyze intermediate metabolism. Virtually every enzyme in glycolysis, gluconeogenesis, the tricarboxylic acid (TCA) cycle, ...
Zaccaro Scelza Míriam F - - 2010
INTRODUCTION: The biocompatibility of chelating agents and organic acids have been explained by a variety of methods, and suggestions for use have been based more on clinical observations and physicochemical properties than on biological aspects. The present study aimed to evaluate the inflammatory response of 17% EDTA, 17% EDTA-T, and ...
Guzman Marcelo I - - 2010
The reaction of glyoxylate with carbon dioxide to produce lactate is promoted when zinc sulfide is irradiated by ultraviolet light. These results, representing a model for the action of colloidal mineral semiconductors on early Earth, complete a consecutive series that culminates in entry-point molecules of the reductive tricarboxylic acid cycle.
Sadykov Marat R - - 2010
Staphylococcus aureus capsule synthesis requires the precursor N-acetyl-glucosamine; however, capsule is synthesized during post-exponential growth when the availability of N-acetyl-glucosamine is limited. Capsule biosynthesis also requires aerobic respiration, leading us to hypothesize that capsule synthesis requires tricarboxylic acid cycle intermediates. Consistent with this hypothesis, S. aureus tricarboxylic acid cycle mutants ...
Hemingway C A - - 2010
The aim of this study was to investigate the effects of two common food proteins on human enamel erosion in vitro. Erosion was measured by non-contact profilometry in citric, malic and lactic acids at pH 2.8, 3.2 and 3.8 and five commercially available soft drinks, in the presence of a ...
Magalhaes Ana Carolina - - 2010
PURPOSE: The objective of the present in vitro study was to evaluate the effect of different minerals in combination with 1% citric acid on dental erosion. MATERIALS AND METHODS: Ninety enamel samples were randomly allocated to nine groups (G1: pure 1% citric acid solution [control]; G2: with 1 mM Ca; ...
Schneider K D - - 2010
Phosphorus deficiencies are limiting crop production in agricultural soils worldwide. Locally available sources of raw phosphate rock (PR) are being recognized for their potential role in soil fertility improvement. Phosphorus bioavailability is essential for the efficiency of PRs and can be increased by acid treatments. The utilization of organic acid ...
Navarro-Escobar Esther - - 2010
AIM: To evaluate the cytotoxicity of 15% citric acid, 5% phosphoric acid and 2.5% NaOCl on cultured fibroblasts using MTT colorimetric assay. METHODOLOGY: Irrigating solutions of 5% phosphoric acid, 15% citric acid, and 2.5% NaOCl, diluted at 0.1% and 0.5%, were applied to cell cultures of 3T3L1 fibroblasts. The cell ...
Gyawali Dipendra D Department of Bioengineering, The University of Texas at Arlington, Arlington, TX 76019, - - 2010
Citric-acid-derived thermally cross-linked biodegradable elastomers (CABEs) have recently received significant attention in various biomedical applications, including tissue-engineering orthopedic devices, bioimaging and implant coatings. However, citric-acid-derived photo-cross-linked biodegradable elastomers are rarely reported. Herein, we report a novel photo-cross-linked biodegradable elastomer, referred to as poly(octamethylene maleate citrate) (POMC), which preserves pendant hydroxyl ...
Makri Anna - - 2010
The growth of Yarrowia lipolytica on glycerol was studied in bioreactor repeated batch cultures and three distinct phases, namely biomass production phase, lipogenic phase and citric acid production phase were identified during growth cycle. In each phase, yeast cells were characterised by specific morphological and biochemical features. Though high activity ...
Salgado Jos? Manuel - - 2009
Yeast extract (YE) is the most common nitrogen source in a variety of bioprocesses in spite of the high cost. Therefore, the use of YE in culture media is one of the major technical hurdles to be overcome for the development of low-cost fermentation routes, making the search for alternative-cheaper ...
Zhang Chao - - 2009
Copigmentation is an important way to improve the stability of anthocyanins. The effect of the copigmentation on the stability of the anthocyanin from the purple potato peel (PA) was evaluated from the view of the kinetics and thermodynamics in both the liquid state and the solid state for the first ...
Zanatta Angela - - 2009
The present work investigated the in vitro effects of D-serine (D-Ser) on important parameters of energy metabolism in cerebral cortex of young rats. The parameters analyzed were CO(2) generation from glucose and acetate, glucose uptake and the activities of the respiratory chain complexes I-IV, of the citric acid cycle enzymes ...
Onoue Satomi - - 2009
Glucagon, a gut hormone, is one of the key regulatory elements in glucose homeostasis, and is clinically used for treatment of hypoglycemia and premedication in peroral endoscopy. Dry powder inhaler (DPI) form of glucagon is believed to be a promising new dosage form, and the present study aimed to develop ...
Sayilgan E - - 2010
The main objective of this study was to investigate the effects of reductive acidic leaching and further precipitation on the recovery of manganese and zinc from spent alkaline and zinc-carbon battery powders. Ascorbic acid (AA), citric acid (CA) and oxalic acid (OA) were tested as the reductants. Sodium hydroxide and ...
Tcherkez Guillaume - - 2009
While the possible importance of the tricarboxylic acid (TCA) cycle reactions for leaf photosynthesis operation has been recognized, many uncertainties remain on whether TCA cycle biochemistry is similar in the light compared with the dark. It is widely accepted that leaf day respiration and the metabolic commitment to TCA decarboxylation ...
Zhu Yefei - - 2009
Staphylococci are the leading causes of endovascular infections worldwide. Commonly, these infections involve the formation of biofilms on the surface of biomaterials. Biofilms are a complex aggregation of bacteria commonly encapsulated by an adhesive exopolysaccharide matrix. In staphylococci, this exopolysaccharide matrix is composed of polysaccharide intercellular adhesin (PIA). PIA is ...
Schink Bernhard - - 2009
A cycle remains a cycle only as long as the spokes of the wheel are not stolen. To keep the citric acid cycle going requires anaplerotic reactions such as the glyoxylate shunt to restore the cycle intermediates that are withdrawn for the biosynthesis of cell constituents, e.g. amino acids and ...
Wang Yan - - 2009
Pretreatments with different chemicals at different concentrations to remove Ca compounds were studied to determine their effects on gelatin extraction from silver carp (Hypophthalmichthys molitrix) scales. During Ca removal with HCl, citric acid, and EDTA, all 3 chemicals were able to decalcify (>90%) scales; however, protein losses with EDTA were ...
Piccioni Fabiana - - 2009
The metabolic profiles of seeds from the transgenic maize variety 33P67 and of the corresponding traditional variety were investigated using one- and two-dimensional NMR techniques. The transgenic variety carries a functional Cry1A(b) gene, which confers to the plant the ability to produce Bt insect toxin. About 40 water-soluble metabolites in ...
Hassanpour Hossein - - 2009
To clarify the effect of orally administered citric acid on the electrocardiographic parameters of pulmonary hypertensive broilers, chicks were reared at high altitude and treated with citric acid for 45 days. Increase of cardiac indices such as right ventricle/total ventricles (RV/TV), RV/body weight and TV/body weight ratio was not observed ...
Kim Jeong Hun - - 2009
Pathological angiogenesis is the most common cause of blindness at all ages including retinopathy of prematurity, diabetic retinopathy, and age-related macular degeneration. Despite advances in therapy, retinopathy of prematurity remains the most sight-threatening vaso-proliferative retinopathy in children. Herein, we demonstrated that rosmarinic acid has an anti-angiogenic activity to retinal neovascularization ...
Buch Aditi D - - 2009
Citric acid secretion by fluorescent pseudomonads has a distinct significance in microbial phosphate solubilization. The role of citrate synthase in citric acid biosynthesis and glucose catabolism in pseudomonads was investigated by overexpressing the Escherichia coli citrate synthase (gltA) gene in Pseudomonas fluorescens ATCC 13525. The resultant approximately 2-fold increase in ...
Arias-Moliz María Teresa - - 2009
The aim of this study was to evaluate the minimal biofilm eradication concentration (MBEC) of sodium hypochlorite (NaOCl), chlorhexidine (CHX), EDTA, and citric and phosphoric acids after 1, 5, and 10 minutes of exposure to biofilms of Enterococcus faecalis. The biofilms grew in the MBEC high-throughput device for 24 hours ...
Sun Changquan - - 2009
A batch of poorly flowing citric acid anhydrate was exposed to 69.9% relative humidity to prepare pure monohydrate with nearly identical particle size and morphology but different surface properties. Flow properties of the powders were tested using a ring shear cell. Results show the hydration can significantly improve flow properties ...
Spanó Júlio César Emboava - - 2009
The aim of this study was to evaluate the concentration of calcium ions and smear layer removal by using root canal chelators according to flame atomic absorption spectrophotometry and scanning electron microscopy. Forty-two human maxillary central incisors were irrigated with 15% ethylenediaminetetraacetic acid (EDTA), 10% citric acid, 10% sodium citrate, ...
Zheng Jie - - 2009
The genetic background determined the composition of black currants and the compositional response to weather conditions. The variety Melalahti had higher values for glucose and sugar/acid ratio and lower contents of fructose, citric acid, quinic acid, and vitamin C than the varieties Mortti and Ola (p<0.05). In comparison to black ...
Wei Wei - - 2009
Roles of organic acids and nitrate in the long-distance transport of cobalt (Co) in xylem saps of hyperaccumulator Alyssum murale and non-hyperaccumulator Trifolium subterraneum were studied under hydroponic conditions. Organic acids (oxalic, malic, malonic, citric, and fumaric) and nitrate in xylem sap samples were separated and determined simultaneously by reversed-phase ...
Thompson A A Roger - - 2009
Ventilatory control undergoes profound changes on ascent to high altitude. We hypothesized that the fall in citric acid cough threshold seen on ascent to altitude is mediated by changes in the central control of cough and would parallel changes in central ventilatory control assessed by the hypercapnic ventilatory response (HCVR). ...
Wu Jinglan - - 2009
One of the conventional processes used for the recovery of citric acid from its fermentation broth is environmentally harmful and cost intensive. In this work an innovative benign process, which comprises simulated moving bed (SMB) technology and use of a tailor-made tertiary poly(4-vinylpyridine) (PVP) resin as a stationary phase is ...
Xie G - - 2009
AIMS: To investigate the ability of the citric acid-producing strain Aspergillus niger ATCC 9142 to utilize the ethanol fermentation co-product corn distillers dried grains with solubles for citric acid production following various treatments. METHODS AND RESULTS: The ability of A. niger ATCC 9142 to produce citric acid and biomass on ...
Silva Andre M N - - 2009
Citric acid is an important metal chelator of biological relevance. Citric acid helps solubilizing metals, increasing their bioavailability for plants and microbes and it is also thought to be a constituent of both the extracellular and cytoplasmic low molecular iron pools occurring in plants and vertebrates. Metal coordination by citric ...
Kidd Susan - - 2009
BACKGROUND: The use of saliva for measurement of cortisol permits non-invasive study of adrenal function, but collection can be technically difficult, particularly in small infants. Saliva collection can be assisted by citric acid to increase saliva flow, or by the use of cotton or polyester swabs in the mouth. AIM: ...
Yapo Beda M - - 2009
An environment-friendly procedure, allowing the extraction of safe pectin products with good functional properties from yellow passion fruit by-product, was developed using two natural acid extractants, namely, pure lemon juice and citric acid solvent. The results show that both of them solubilise, from cell wall material, pectins characterised by high ...
Bari Md Niamul - - 2009
A sequential optimization based on statistical design and one-factor-at-a-time (OFAT) method was employed to optimize the media constituents for the improvement of citric acid production from oil palm empty fruit bunches (EFB) through solid state bioconversion using Aspergillus niger IBO-103MNB. The results obtained from the Plackett-Burman design indicated that the ...
Santiago-Moreno J - - 2009
The effectiveness of electroejaculation for obtaining Spanish ibex sperm samples for freeze preserving outside the rutting season was evaluated-the aim being to optimise biological resources for the establishment of germplasm banks. The effect of different egg yolk concentrations (6% or 12%, v/v) in diluents of different buffer composition (Tris-citric acid ...
Cho Seungho - - 2009
We have studied the precursor effects of citric acid and various citratesincluding triethyl citrate, tripotassium citrate, trisodium citrate and triammonium citrateon the formation of ZnO crystals in alkaline solution. These citrate-related chemicals could be divided into three groups (group A, triethyl citrate; group B, tripotassium citrate and trisodium citrate; and ...
Nakui Hiroyuki - - 2009
It was found for the first time that citric acid was decomposed to formic acid, acetic acid and lactic acid in the presence of coal ash particles at pH 3 at 20 degrees C, while it was not decomposed at more than pH 5. The yield of organic acid at ...
Abbasi Soleiman - - 2009
Over the past few decades, microwave processing and its high potential capabilities have attracted food scientists. Application of microwave for microencapsulation is an innovative and new method in which the shell, due to having different dielectric constant, can fuse and cover core. In this research, the citric acid powder at ...
Reddy Narendra - - 2009
This paper reports the wet cross-linking of gliadin fibers using citric acid without using phosphorus-containing catalysts or high temperatures. Carboxylic acids such as citric acid are inexpensive and nontoxic chemicals preferred for cross-linking proteins and cellulose. However, previous studies have shown that carboxylic acid cross-linked materials experience substantial strength loss ...
Becerik Sema - - 2009
OBJECTIVE: To evaluate the effects of platelet-derived growth factor-BB (PDGF-BB) on the attachment of human periodontal ligament cells (HPLCs) on the root surfaces demineralized with different agents. METHODS: We performed this study at Ege University, Izmir, Turkey between 2005 and 2006. Eighty root slices were subjected to one of following ...
1 2 3 4 5 6 7 8 9 10 >