Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 23
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Food Chem ; 351: 129324, 2021 Feb 18.
Artigo em Inglês | MEDLINE | ID: mdl-33647694

RESUMO

Conjugation between peptides and polyphenols could improve their bioactive and functional properties. The improvement effects of anchovy protein hydrolysates (APH) -polyphenol (catechin (CA), gallic acid (GA), tannic acid (TA)) conjugates were investigated. The content of protein and polyphenols and ratio of polyphenols/peptides in conjugates increased as the number of OH group increased with TA > CA > GA. Results showed that APH-CA and APH-GA exhibited the highest ORAC and ABTS+ scavenging capacity, respectively. Mass spectrometry analysis suggested the highest number of bioactive peptides were identified in APH-CA 5:1 (APH/polyphenols). The physical stability of fish oil emulsions during storage was significantly enhanced by TA 5:1 conjugate followed by CA 5:1 conjugate. The oxidative stability was remarkably elevated by APH-GA 10:1. This was due to the antioxidant capacity and the peptides adsorbed at the interfacial. This study demonstrated that APH-polyphenol conjugates could bring the possibility of utilizing peptides-polyphenols in the nutraceutical and functional food ingredient fields.

2.
J Gynecol Obstet Hum Reprod ; 50(5): 102043, 2020 Dec 10.
Artigo em Inglês | MEDLINE | ID: mdl-33310135

RESUMO

AIM: Endometriosis is associated with infertility. The aim of this study was to examine the overall proteomic changes of eutopic endometrium in infertile women with endometriosis. METHODS: Tandem mass tags combined with multidimensional liquid chromatography and mass spectrometry analyses were used to screen the proteomic profiles of eutopic endometrium from infertile patients with endometriosis (N = 4), compared with that from patients without endometriosis (N = 4). Quantitative proteomic analysis, functional categories and significant pathway analysis were investigated subsequently. RESULTS: In total, 6.698 proteins were identified, among which 5,812 proteins were quantified. Compared with controls, proteomic analysis showed some differentially expressed proteins: 16 up-regulated proteins and 23 down-regulated proteins. Bioinformatics analysis indicated that differentially expressed proteins were involved in humoral immune response pathways, antimicrobial humoral response and regulation of nitric oxide biosynthetic process. Besides, our results showed that alpha-1-acid glycoprotein 2, complement factor B and zinc transporter Zip14 were important resources for investigating potential mechanism of infertility in infertile women with endometriosis. CONCLUSIONS: This study provided a reference proteome map of eutopic endometrium from infertile women with endometriosis. The long-term benefits of using those markers to stratify clinical treatment warrant further investigation.

3.
Phys Rev E ; 101(4-1): 043115, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32422729

RESUMO

Rayleigh-Taylor instability (RTI) under radiation background is commonly found in both engineering applications and natural phenomena. In the optically thin and incompressible limit, the corresponding problem can be simplified as an interface discontinuous acceleration (IDA) RTI problem, but to date has only been studied in the linear stage. In this paper, the entire IDA-RTI evolution was studied numerically and theoretically, particularly for the stages beyond the linear stage. The results show that the IDA-RTI problem is equivalent to the classical RTI with the effective acceleration g_{eff}^{*} that is introduced in this work. Moreover, our studies further show that IDA-RTI can occur if and only if g_{eff}^{*}>0 (from heavy fluid to light fluid). This criterion means that IDA-RTI can occur when (i) heavy fluid supports (or accelerates) the light fluid or (ii) the two fluids have the same density, in contrast to the classical RTI problem. Moreover, the quasisteady bubble and spike velocities are theoretically predicted with quantitative accuracy, showing good agreement with the results of numerical simulations in a wide range of density ratios and acceleration configurations.

4.
Int J Environ Health Res ; 30(6): 618-629, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31140839

RESUMO

To evaluate the association of environmental tobacco smoke (ETS) exposure with hypertension and blood pressure (BP) in children, a sample of 9,354 children, aged 5-17 years, was studied from seven northeastern cities of China in 2012-2013. The results showesd that significant associations were observed for hypertension with ETS exposure in utero [odds ratio (OR) 1.36, 95% confidence interval (CI) 1.18-1.57], with current major ETS exposure from fathers (1.38, 1.21-1.57) or anyone (1.26, 1.12-1.42), and with intensity of ETS exposure greater than 1 cigarette per day (ORs ranged from 1.20 to 1.35). For SBP, significant associations were only observed in children with major ETS exposure from father and with cigarettes smoking >10/day. When stratified by sex, more significant associations were found in girls than in boys. In conclusion, prenatal and postnatal ETS exposure was significantly associated with increased odds of hypertension in children, especially in girls.


Assuntos
Pressão Sanguínea , Exposição Ambiental/efeitos adversos , Hipertensão/epidemiologia , Efeitos Tardios da Exposição Pré-Natal/epidemiologia , Poluição por Fumaça de Tabaco/efeitos adversos , Adolescente , Criança , Pré-Escolar , China/epidemiologia , Cidades/epidemiologia , Feminino , Humanos , Hipertensão/induzido quimicamente , Masculino , Razão de Chances , Gravidez , Efeitos Tardios da Exposição Pré-Natal/induzido quimicamente , Fatores Sexuais
5.
Food Res Int ; 126: 108604, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31732021

RESUMO

This work aimed to develop a novel colorimetric indicator film for monitoring of food freshness based on gelatin/polyvinyl alcohol matrix incorporated with anthocyanin extracts from mulberry. The color of anthocyanin extracts solutions obviously changed from bright red to dark green in the pH range of 2.0-11.0. FTIR spectra and isothermal titration calorimetry showed that the anthocyanin extracts were successfully combined with gelatin/polyvinyl alcohol matrix by hydrogen binding and electrostatic interaction, which enhanced the stability of anthocyanin. The scanning electric microscopy showed that the compatibility between polyvinyl alcohol and gelatin were improved owing to the addition of anthocyanin extracts. With the anthocyanin extracts addition from 0 to 45 mg/100 mL mixed solution, the tensile strength decreased from 30.80 to 21.01 MPa and the elongation at break increased from 589.22% to 905.86%. The color response of film in buffer solution of different pH were in accordance with anthocyanin extracts solutions, and its color changes were clearly visible with naked eye. Finally, the film was evaluated by a test on monitoring fish spoilage, which presented visible color changes due to volatile nitrogenous compounds formed over time. These results showed that this developed film could be used as an effective method for the monitoring of food freshness.


Assuntos
Antocianinas/química , Embalagem de Alimentos/instrumentação , Indicadores e Reagentes/química , Morus/química , Álcool de Polivinil/química , Alimentos Marinhos , Animais , Colorimetria , Peixes , Armazenamento de Alimentos/instrumentação , Gelatina/química , Ligação de Hidrogênio , Concentração de Íons de Hidrogênio , Microscopia Eletrônica de Varredura , Extratos Vegetais/química , Espectroscopia de Infravermelho com Transformada de Fourier , Eletricidade Estática
7.
Phys Rev E ; 99(5-1): 053102, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-31212447

RESUMO

The Richtmyer-Meshkov instability of small perturbed single-mode interfaces between an elastic-plastic solid and an inviscid liquid is investigated by theoretical analysis and numerical simulation in this work. A modified model including the Atwood number effect is proposed to describe the long-term behaviors of small perturbations at the solid-liquid interface. In contrast to an effective theoretical model at the solid-vacuum interface, this model is appropriate at different Atwood numbers. Owing to the effect of elastic-plastic characteristics and the density ratio, the evolution of the spike amplitude exhibits nonlinear mechanical behavior. As the absolute value of the Atwood number decreases, the maximum spike amplitude also decreases. To validate this model, an Eulerian finite-difference multicomponent code is adopted to study the time evolution of the spike amplitude at different Atwood numbers. The model coefficients are obtained by analyzing the relevant characteristic statistics collected from the numerical results. Under different initial conditions such as Atwood number and shock strength, the applicability of this modified model is verified by comparing the numerical results with the model profile. The consistency in results signifies that the modified model is not only suitable for specific shock intensity and Atwood number, but also adaptable within a certain range.

8.
Gynecol Obstet Invest ; 83(6): 558-563, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29879698

RESUMO

AIM: To study whether infertile patients with endometriosis have a higher prevalence of endometrial polyps, and to clarify the characteristics of the pathology of combined polyps. METHODS: Infertile patients who had undergone both hysteroscopy and laparoscopy in Reproductive Hospital Affiliated with Shandong University from January 2014 to May 2017 were enrolled. Patients with and without endometriosis, diagnosed by laparoscopy, were staged and included in the study group and control group, respectively, and the prevalence of polyps was compared. The pathological types of endometrial polyps were analyzed. RESULTS: A total of 414 cases were enrolled in the study group and 3,048 cases in the control group; polyps were diagnosed, with endoscopy, in 1,107 patients. Endometrial polyps were detected by hysteroscopy in 47.83% of the endometriosis group and 29.82% of the control group. The prevalence of endometrial polyps was significantly higher in the endometriosis group than in the control group (p < 0.001) but not significantly different between stages of endometriosis (p = 0.580). The pathological diagnosis included 899 endometrial polyps and 208 polypoid hyperplasia; 66.5% of endometrial polyps were combined with simple hyperplasia. CONCLUSIONS: The infertile patients with endometriosis had a higher prevalence of endometrial polyps, and those polyps are often combined with simple hyperplasia.


Assuntos
Neoplasias do Endométrio/epidemiologia , Endometriose/complicações , Infertilidade Feminina/complicações , Pólipos/epidemiologia , Adulto , Estudos de Coortes , Neoplasias do Endométrio/complicações , Neoplasias do Endométrio/patologia , Feminino , Humanos , Histeroscopia/estatística & dados numéricos , Infertilidade Feminina/diagnóstico , Laparoscopia/estatística & dados numéricos , Pessoa de Meia-Idade , Pólipos/complicações , Pólipos/patologia , Gravidez , Prevalência , Estudos Retrospectivos
9.
Phys Rev E ; 97(3-1): 033108, 2018 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-29776047

RESUMO

Implicit large eddy simulations of two-dimensional Rayleigh-Taylor instability at different density ratios (i.e., Atwood number A=0.05, 0.5, and 0.9) are conducted to investigate the late-time dynamics of bubbles. To produce a flow field full of bounded, semibounded, and chaotic bubbles, three problems with distinct perturbations are simulated: (I) periodic sinusoidal perturbation, (II) isolated W-shaped perturbation, and (III) random short-wave perturbations. The evolution of height h, velocity v, and diameter D of the (dominant) bubble with time t are formulated and analyzed. In problem I, during the quasisteady stage, the simulations confirm Goncharov's prediction of the terminal speed v_{∞}=Frsqrt[Agλ/(1+A)], where Fr=1/sqrt[3π]. Moreover, the diameter D at this stage is found to be proportional to the initial perturbation wavelength λ as D≈λ. This differed from Daly's simulation result of D=λ(1+A)/2. In problem II, a W-shaped perturbation is designed to produce a bubble environment similar to that of chaotic bubbles in problem III. We obtain a similar terminal speed relationship as above, but Fr is replaced by Fr_{w}≈0.63. In problem III, the simulations show that h grows quadratically with the bubble acceleration constant α≡h/(Agt^{2})≈0.05, and D expands self-similarly with a steady aspect ratio ß≡D/h≈(1+A)/2, which differs from existing theories. Therefore, following the mechanism of self-similar growth, we derive a relationship of ß=4α(1+A)/Fr_{w}^{2} to relate the evolution of chaotic bubbles in problem III to that of semibounded bubbles in problem II. The validity of this relationship highlights the fact that the dynamics of chaotic bubbles in problem III are similar to the semibounded isolated bubbles in problem II, but not to that of bounded periodic bubbles in problem I.

10.
Meat Sci ; 133: 26-35, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28595100

RESUMO

The experiment was conducted to assess the protective effects of Momordica grosvenori extract (MGE) against lipid and protein oxidation-induced damage in vacuum-packed dried minced pork slices stored at room temperature for 21days. Antioxidant activity of MGE was evaluated by measuring its radical scavenging activities and reducing power with progressive concentrations from 40 to 200g/L. MGE was added to the dried minced pork slices at 7, 10 or 15g/100g. Results showed that inclusion of MGE in dried minced pork slice significantly delayed the formation of hexanal, thiobarbituric acid-reactive substances and carbonyls and reduced the sulfhydryl loss in a dose-dependent manner (P<0.05), indicating that MGE exerted a protective effect against lipids and protein oxidation. Concomitantly, an intense increase of redness and loss of lightness and yellowness was found to take place (P<0.05), though it exhibited little negative effects on the sensory properties of slices. Mogrosides, the main bioactive components in M. grosvenori, decreased primarily during processing while they were relatively stable during storage under vacuum condition, room temperature. All these results demonstrated MGE had great potential as a natural antioxidant used in meat products.


Assuntos
Conservação de Alimentos/métodos , Produtos da Carne/análise , Momordica , Extratos Vegetais/farmacologia , Carne Vermelha/análise , Animais , Peroxidação de Lipídeos/efeitos dos fármacos , Proteínas Musculares/química , Oxirredução/efeitos dos fármacos , Suínos
11.
Food Chem ; 227: 211-218, 2017 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-28274424

RESUMO

The functionality and structural properties of pig skin hydrolysates with different degrees of hydrolysis (DH, 10% and 20%) and microfluidisation (120MPa), prepared by pepsin and Alcalase® have been investigated in this study. Extensive hydrolysis can significantly improve the absolute value of the zeta potential and surface hydrophobicity. The particle distribution of hydrolysates decreased with increasing DH. The numbers of free sulfhydryl (SH) and disulfide bonds (SS) were significantly increased with increasing DH (p<0.05). Hydrolysates with a lower DH showed a better emulsifying property than those with a higher DH. Microfluidisation led to the transformation of structural and interfacial properties of the hydrolysates and increased the value of the zeta potential, S0, and gel strength. Microfluidisation results in limited breakage of chemical bonds, the number of SS and SH bonds unchanged in the treatment. These results reflect the functionality and structural properties of collagen-rich pig skin hydrolysates.


Assuntos
Colágeno , Microfluídica , Hidrolisados de Proteína/química , Animais , Emulsões , Interações Hidrofóbicas e Hidrofílicas , Pele , Suínos
12.
Phys Rev E ; 93(6): 063102, 2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-27415354

RESUMO

Turbulent mixing induced by Rayleigh-Taylor (RT) instability occurs ubiquitously in many natural phenomena and engineering applications. As the simplest and primary descriptor of the mixing process, the evolution of mixing width of the mixing zone plays a notable role in the flows. The flows generally involve complex varying acceleration histories and widely varying density ratios, two dominant factors affecting the evolution of mixing width. However, no satisfactory theory for predicting the evolution has yet been established. Here a theory determining the evolution of mixing width in general RT flows is established to reproduce, first, all of the documented experiments conducted for diverse (i.e., constant, impulsive, oscillating, decreasing, increasing, and complex) acceleration histories and all density ratios. The theory is established in terms of the conservation principle, with special consideration given to the asymmetry of the volume-averaged density fields occurring in actual flows. The results reveal the sensitivity or insensitivity of the evolution of a mixing front of a neighboring light or heavy fluid to the degree of asymmetry and thus explain the distinct evolutions in two experiments with the same configurations.

13.
Food Chem ; 213: 721-727, 2016 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-27451240

RESUMO

This study was designed to evaluate mulberry anthocyanins bioconversion traits for intestinal probiotics. Five intestinal beneficial bacteria were incubated with mulberry anthocyanins under anaerobic conditions at 37°C, and bacterial ß-glucosidase activity and anthocyanin level were determined. Results demonstrated that all strains could convert mulberry anthocyanins to some extent. With high ß-glucosidase production capacity, Streptococcus thermophiles GIM 1.321 and Lactobacillus plantarum GIM 1.35 degraded mulberry anthocyanins by 46.17% and 43.62%, respectively. Mulberry anthocyanins were mainly biotransformed to chlorogenic acid, crypto-chlorogenic acid, caffeic acid, and ferulic acid during the anaerobic process. Non-enzymatic deglycosylation of anthocyanins also occurred and approximately 19.42% of the anthocyanins were degraded within 48h by this method.


Assuntos
Antocianinas/farmacocinética , Microbioma Gastrointestinal , Morus/química , Extratos Vegetais/farmacocinética , Probióticos , Antocianinas/análise , Disponibilidade Biológica , Biotransformação , Ácido Clorogênico/metabolismo , Frutas/química , Mucosa Intestinal/metabolismo , Intestinos/efeitos dos fármacos , Intestinos/microbiologia , Lactobacillus plantarum/metabolismo , Extratos Vegetais/análise , Streptococcus thermophilus/metabolismo , beta-Glucosidase/metabolismo
14.
Appl Biochem Biotechnol ; 178(7): 1303-14, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26638211

RESUMO

A novel mesophilic anaerobic digestion process with detoxification-treated coconut shell pyroligneous was established, exhibiting an effective advantage in biogas production. The pyroligneous collected contained 166.2 g l(-1) acetic acid, indicating great potential for biogas production. Detoxification was an effective way of simultaneously enriching biodegradable ingredients and removing inhibitors (mainly as phenols and organic acids) for digestion process. The digestion process lasted 96 h and fermentation characteristics (chemical oxygen demand (COD) removal ratio, volatile fatty acid (VFA) consumptions, pH, total gas, methane yield, and phenol removal efficiency) were measured. The experiments successfully explored the optimum detoxification parameters, oxidized with 10 % H2O2 followed by overliming, and demonstrated 89.3 % COD removal, 91.4 % methane content, 0.305 LCH4/g COD removed CH4 yield, and 88.81 % phenol removal ratio. This study provided clues to overcome the negative effects of inhibitors in pyroligneous on biogas production. The findings could contribute to significant process in detoxified pretreatment of pyroligneous and develop an economically feasible technology for treating pyroligneous after producing charcoal.


Assuntos
Biocombustíveis , Cocos/química , Fermentação , Terpenos/química , Anaerobiose , Análise da Demanda Biológica de Oxigênio , Cocos/metabolismo , Ácidos Graxos Voláteis/química , Ácidos Graxos Voláteis/metabolismo , Peróxido de Hidrogênio/química , Desentoxicação Metabólica Fase I , Metano/biossíntese , Metano/química , Fenóis , Terpenos/metabolismo
15.
J Food Sci ; 80(2): M405-10, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25585519

RESUMO

The aim of this study was to investigate the changes of quality attributes of Prunus mume fruits during deacidification using the fermentation of Lactobacillus fermentium. Results of HPLC analysis showed that the sucrose and glucose were dominant sugars, and citric acid was dominant organic acids in P. mume fruits. The level of citric acid reaches 39.3 g/kg, and yet the sucrose and glucose content in the P. mume fruits was very lower, which were 2.16 and 0.66 g/L, respectively. After 8 d of fermentation, sugar and citric acid in the P. mume fruits was completely consumed, and the total phenolics, antioxidant activity (oxygen radical absorbance capacity value), and sarcocarp firmness retained 64.4%, 70.0%, 62.6%, respectively. Also, the viability counts of L. fermentium in fermentation broth increased slowly, which were near 8.0 lg CFU/mL after 8 d of fermentation at 30 °C. Overall, fermentation with L. fermentium can be applied in deacidification of P. mume fruits, and also the fermented P. mume fruits can meet the standard to be further processed into prune or sauces, and the fermentation broth of P. mume fruits with L. fermentium have a good prospect in the development of probiotic beverage.


Assuntos
Ácido Cítrico/metabolismo , Fermentação , Frutas/microbiologia , Glucose/metabolismo , Lactobacillus , Prunus/microbiologia , Sacarose/metabolismo , Antioxidantes/análise , Bebidas , Cromatografia Líquida de Alta Pressão , Sacarose na Dieta/análise , Microbiologia de Alimentos , Frutas/metabolismo , Frutas/normas , Dureza , Humanos , Fenóis/análise , Probióticos , Prunus/química
16.
J Org Chem ; 80(7): 3368-86, 2015 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-25521308

RESUMO

We report the enantioselective, lateral deprotonation of ortho-protected or functionalized tertiary N,N-dialkyl aryl O-carbamates 5-7 (Scheme 2 ) and meta-protected carbamates 14, 15, and 20 (Schemes 5 and 7 ) by s-BuLi/(-)-sparteine and subsequent quench with a variety of electrophiles to give products 11-13 and 16, 17, and 21 in yields up to 96% and enantiomeric ratios up to 99:1. The influence of organolithium reagents, ratio of organolithium/(-)-sparteine pair versus N,N-dialkyl aryl O-carbamate starting materials, temperature, solvents, electrophiles, substituents located ortho or meta to the O-carbamate moiety, and O-carbamate N-substituents was investigated. The identical absolute configuration of the stereogenic center of the major enantiomers of the products, as established by single-crystal X-ray analysis for substrates (S)-11c, (S)-19, and (S)-21a, provides evidence for a consistent stereochemical course in the enantioselective deprotonation. Mechanistic investigations, including an estimate of the configurational stability of the benzyllithium species 9 (starting from 12e; Scheme 8 ) and 23 (starting from 17e; Scheme 9 ), both derived by tin-lithium exchange, and 24 (starting from 20; Scheme 9 ) are reported. The experimental results, together with semiempirical molecular orbital calculations (PM3/SMD), are consistent with a process in which enantioinduction occurs in the deprotonation step (Scheme 11 ).


Assuntos
Carbamatos/química , Compostos de Lítio/química , Silanos/química , Esparteína/química , Cristalografia por Raios X , Estrutura Molecular , Estereoisomerismo
17.
Food Chem ; 153: 114-20, 2014 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-24491708

RESUMO

In this study, the effects of ultra-high pressure homogenisation (UHPH) processing at 200 MPa for 1-3 successive passes (inlet temperatures at 4°C) were compared with pasteurisation (95°C, 1 min) processing on phenolic compounds, antioxidant capacity (ORAC value) and anti-glucosidase of mulberry juice. Compared with thermal pasteurisation processing, the more reductions in the anthocyanins, phenolic acids (gallic, protocatechuic, caffeic and p-coumaric acids, and a unknown hydroxycinnamic acid) and quercetin aglycone contents, as well as ORAC value were observed during UHPH processing of mulberry juice, whereas all reductions above during UHPH processing could be inhibited by adding ascorbic acid to mulberry juice. Besides, no significant change (p>0.05) in the α-glucosidase inhibitory activity was observed during UHPH processing of mulberry juice, but showed a 14% reduction in mulberry juice processed by thermal pasteurisation.


Assuntos
Antioxidantes/análise , Bebidas/análise , Inibidores Enzimáticos/análise , Manipulação de Alimentos/métodos , Frutas/química , Glucosidases/antagonistas & inibidores , Morus/química , Fenóis/análise , Manipulação de Alimentos/instrumentação , Glucosidases/análise , Humanos
18.
J Food Sci ; 78(8): M1236-41, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23957413

RESUMO

The individual and combined influences of dimethyl dicarbonate (DMDC) and nisin (200 IU/mL) at mild heat on the inactivation of indigenous microorganisms in litchi juice, including bacteria, molds and yeasts (M&Y), were investigated. The fresh litchi juice with or without nisin were exposed to 250 mg/L DMDC at 30, 40, or 45 °C for 0.5, 1, 2, 3, 4, or 6 h. A complete inactivation of M&Y in the litchi juice with or without nisin was achieved as exposed to 250 mg/L DMDC at 30, 40, or 45 °C for 0.5 h. The bacteria, especially Bacillus sp. and Leuconstoc mesenteroides showed higher resistance than M&Y in the litchi juice. Bacillus sp. and Leuconstoc mesenteroides in the litchi juice was not completely inactivated by 250 mg/L DMDC at 30, 40, or 45 °C. However, nisin addition can enhanced the inactivation of these bacteria by DMDC, and nisin and DMDC also showed a synergistic effect on the inactivation of bacteria. M&Y and bacteria were not detected in the litchi juice added with 200 IU/mL nisin as exposed to 250 mg/L DMDC at 45 °C for 3 h. In addition, microbial shelf life of the litchi juice during storage at 4 °C also was evaluated as treated by 250 mg/L DMDC or combination with nisin at 45 °C for 3 h.


Assuntos
Bebidas/microbiologia , Dietil Pirocarbonato/análogos & derivados , Conservação de Alimentos , Litchi/microbiologia , Nisina/farmacologia , Antibacterianos/farmacologia , Bacillus/efeitos dos fármacos , Bacillus/crescimento & desenvolvimento , Bacillus/isolamento & purificação , Contagem de Colônia Microbiana , Dietil Pirocarbonato/farmacologia , Sinergismo Farmacológico , Contaminação de Alimentos/prevenção & controle , Manipulação de Alimentos , Microbiologia de Alimentos , Frutas , Leuconostoc/efeitos dos fármacos , Leuconostoc/crescimento & desenvolvimento , Leuconostoc/isolamento & purificação , Organização Mundial da Saúde
19.
Phys Rev Lett ; 109(5): 054502, 2012 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-23006178

RESUMO

A series of Mach-number- (M) invariant scalings is derived for compressible turbulent boundary layers (CTBLs), leading to a viscosity weighted transformation for the mean-velocity profile that is superior to van Driest transformation. The theory is validated by direct numerical simulation of spatially developing CTBLs with M up to 6. A boundary layer edge is introduced to compare different M flows and is shown to better present the M-invariant multilayer structure of CTBLs. The new scalings derived from the kinetic energy balance substantiate Morkovin's hypothesis and promise accurate prediction of the mean profiles of CTBLs.

20.
Nano Lett ; 8(10): 3226-32, 2008 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-18759488

RESUMO

We present a comprehensive approach to address the correlation between mechanical properties of nanowires (NWs) with their characteristic size, microstructure, and chemical composition. Using this technique, the Young's modulus of Co3O4 NWs with different sizes was evaluated. Thermal annealing in inert atmosphere was found to induce chemical reduction of as-grown Co3O4 NWs into CoO NWs without modifying their geometrical shape. Both Co3O4 and CoO NWs exhibited a size-dependent variation in Young's modulus.


Assuntos
Cobalto/química , Nanopartículas Metálicas/química , Nanotecnologia/métodos , Nanofios/química , Óxidos/química , Desenho de Equipamento , Microscopia Eletrônica de Varredura , Microscopia Eletrônica de Transmissão/métodos , Nanoestruturas/química , Análise Espectral Raman
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...