Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 35
Filtrar
1.
Lett Appl Microbiol ; 75(1): 114-125, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35298847

RESUMO

Mold growth reduces the quality of stored grains, besides producing toxins that pose a potential threat to human health. Therefore, prevention of grain mold growth during storage is important to ensure a safe and high-quality product, preferably using an eco-friendly antifungal agent. The puroindoline (PIN) protein was extracted by Triton X-114 and identified by QE mass spectrometry. Aspergillus flavus has attracted much attention because of its toxic secondary metabolites, and PIN protein showed a significant inhibition on A. flavus growth. Scanning electron microscopy revealed altered spore morphology of A. flavus following PIN protein treatment, and propidium iodide staining showed incomplete spore cell membranes. The disruption and deformation of A. flavus spores suggest that the cell walls and cell membranes were compromised. Decreased mitochondrial membrane potential and increased levels of intracellular reactive oxygen specieswere detected using JC-1 and 2,7-dichlorodihydrofluorescein diacetate staining, respectively. PIN protein could effectively inhibit the growth and aflatoxins B1 production of A. flavus in stored grains, such as wheat and rice. PIN proteins can inhibit the growth of many common grain storage molds, including Penicillium, Aspergillus spp. (A. flavus, A. glaucus, A. kawachii, A. ochraceus and A. niger), Alternaria and Fusarium graminearum, in a dose-dependent manner. PIN protein has a significant inhibitory effect on the growth of grain molds, with a stronger inhibitory effect noted in wheat and rice. Our study provides a novel and simple theoretical basis for the selection and storage of mold resistance in grains and food during storage.


Assuntos
Aflatoxinas , Oryza , Antifúngicos/metabolismo , Antifúngicos/farmacologia , Aspergillus , Aspergillus flavus , Grão Comestível , Humanos , Triticum
2.
Zhonghua Yu Fang Yi Xue Za Zhi ; 56(2): 178-184, 2022 Feb 06.
Artigo em Chinês | MEDLINE | ID: mdl-35184447

RESUMO

Objective: To analyze the Staphylococcal enterotoxins, Staphylococcal enterotoxin genes, drug resistance and molecular typing of 41 Staphylococcus aureus isolates from 2 food-borne illness outbreaks on 21 August and 27 September 2020 in Guangzhou. Methods: A total of 41 Staphylococcus aureus isolates from 2 outbreaks were analyzed by multilocus sequence typing (MLST) and spa typing. The Staphylococcal enterotoxins typing and the Staphylococcal enterotoxin genes of the isolates were analyzed by ELISA and PCR, respectively. The antimicrobial susceptibility of the isolates was performed by disc diffusion. 21 Staphylococcus aureus isolates were characterized using whole genome sequencing (WGS). Based on the whole genome single nucleotide polymorphism (SNP), the phylogenetic tree was constructed by Snippy. Results: 41 Staphylococcus aureus isolates were divided into 2 types by MLST and spa typing: ST6-t701 and ST7-t091. 2 ST7-t091 isolates were identified as methicillin-resistant Staphylococcus aureus (MRSA). 25 ST7-t091 isolates and 14 ST6-t701 isolates were methicillin-sensitive Staphylococcus aureus (MSSA), and were resistant to 7 and 6 antibiotics, respectively. All isolates were positive for sea by PCR. WGS revealed all 21 isolates carried scn, sak, sea, hla, hld, hlgA, hlgB, hlgC, lukD virulence genes. The results showed the isolates contained an immune evasion cluster type D which located in bacteriophage ϕSa3. The SNP phylogenetic tree showed 2 MRSA ST7-t091 were constituted a separate clade from the 12 MSSA ST7-t091 isolates and 7 ST6-t701 isolates showed high similarity to each other. Conclusion: Base on the results of phylogenetic analysis, the 2 food-borne illness outbreaks occurred on 21 August and 27 September 2020 are caused by the combination of the MRSA ST7-t091 strain and the MSSA ST7-t091 strain, and the MSSA ST6-t701 strain, respectively. All isolates have high level of antibiotic resistance and carry high virulent genes.


Assuntos
Doenças Transmitidas por Alimentos , Staphylococcus aureus Resistente à Meticilina , Infecções Estafilocócicas , Antibacterianos/farmacologia , Surtos de Doenças , Doenças Transmitidas por Alimentos/epidemiologia , Humanos , Staphylococcus aureus Resistente à Meticilina/genética , Testes de Sensibilidade Microbiana , Tipagem de Sequências Multilocus/métodos , Filogenia , Infecções Estafilocócicas/epidemiologia , Staphylococcus aureus/genética
3.
Zhonghua Yu Fang Yi Xue Za Zhi ; 53(9): 900-906, 2019 Sep 06.
Artigo em Chinês | MEDLINE | ID: mdl-31474071

RESUMO

Objective: To study the distribution and related factors of curative care expenditure (CCE) of injury in Gansu Province in 2017. Methods: Based on the "A System of Health Accounts 2011 (SHA 2011)", the curative care expenditure of injury in Gansu Province was calculated and analyzed. The five-stage stratified cluster sampling method was adopted to extract 149 medical and health institutions, 120 township hospitals (including community health service centers), 150 individual clinics and 600 village clinics (including community health service stations). The top-down allocation method was used to calculate the cost of injury treatment in Gansu Province, and the influencing factors were analyzed by multiple linear regression. Results: In 2017, the CCE of injury in Gansu province was 3.831 billion yuan, and the expense in general hospitals was 2.708 billion yuan. Among them, the cost of lower limb injury and head injury were 1.090 and 0.847 billion yuan. People aged 40 to 69 years old spent 1.901 billion yuan on injury treatment, and the CCE of injury treatment for men and women were 2.422 and 1.409 billion yuan respectively. The results of multiple linear regression showed that hospitalization expenditure was significantly associated with length of stay, operation, hospital grade, age, payment method and gender (P<0.001). Conclusion: The economic burden of injury in Gansu Province is relatively heavy, so it is necessary to focus on preventions for different groups and costly injury sites.


Assuntos
Gastos em Saúde , Hospitalização , Ferimentos e Lesões/epidemiologia , Adulto , Idoso , China , Serviços de Saúde Comunitária , Feminino , Hospitalização/economia , Hospitalização/estatística & dados numéricos , Hospitais/estatística & dados numéricos , Humanos , Masculino , Pessoa de Meia-Idade , Ferimentos e Lesões/economia
4.
Environ Technol ; 36(5-8): 732-41, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25179044

RESUMO

A model simulating the effluent nitrogen (N) concentration of treated animal farm wastewater in a pilot on-site constructed wetland (CW) system, using dewatered alum sludge cake (DASC) as wetland substrate, is presented. The N-model was developed based on the Structural Thinking Experiential Learning Laboratory with Animation software and is considering organic nitrogen, ammonia nitrogen (NH3) and nitrate nitrogen (NO3-N) as the major forms of nitrogen involved in the transformation chains. Ammonification (AMM), ammonia volatilization, nitrification (NIT), denitrification, plant uptake, plant decaying and uptake of inorganic nitrogen by algae and bacteria were considered in this model. pH, dissolved oxygen, temperature, precipitation, solar radiation and nitrogen concentrations were considered as forcing functions in the model. The model was calibrated by observed data with a reasonable agreement prior to its applications. The simulated effluent detritus nitrogen, NH4-N, NO3-N and TN had a considerably good agreement with the observed results. The mass balance analysis shows that NIT accounts for 65.60%, adsorption (ad) (11.90%), AMM (8.90%) followed by NH4-N (Plants) (5.90%) and NO3-N (Plants) (4.40%). The TN removal was found 52% of the total influent TN in the CW. This study suggested an improved overall performance of a DASC-based CW and efficient N removal from wastewater.


Assuntos
Modelos Teóricos , Compostos de Nitrogênio , Nitrogênio/isolamento & purificação , Purificação da Água , Áreas Alagadas
5.
Genet Mol Res ; 12(1): 618-30, 2013 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-23408449

RESUMO

Natural resistance-associated macrophage protein 1 and 2 encoding genes (Nramp1 and Nramp2) are related to many diseases. We cloned the cDNA of chicken Nramp1 and Nramp2 genes, characterized their expression and polymorphisms, and investigated the association of some SNPs with resistance to salmonellosis. The Nramp1 cDNA was 1746 bp long and the Nramp2 cDNA was 1938 bp long. These cDNAs are similar to previously reported cDNAs, varying by two and one amino acids, respectively. The chicken Nramp1 gene expressed predominantly in liver, thymus and spleen in both females and males. The Nramp2 gene expressed in almost all tissues, but predominantly in breast muscle, leg muscle, cerebrum, cerebellum, lung, kidney, and heart in both females and males. We identified 45 SNPs and 2 indels in the chicken Nramp1 gene; three of 13 SNPs in the exons were missense mutations (Arg223Gln, Ala273Glu and Arg497Gln). Association analysis indicated that A24101991G is significantly associated with chicken salmonellosis resistance. These results will be useful for functional investigation of chicken Nramp1 and Nramp2 genes.


Assuntos
Proteínas de Transporte de Cátions/genética , Galinhas/genética , Infecções por Salmonella/genética , Sequência de Aminoácidos , Animais , Sequência de Bases , Galinhas/microbiologia , Clonagem Molecular , DNA Complementar/genética , Éxons , Feminino , Estudos de Associação Genética/métodos , Masculino , Dados de Sequência Molecular , Filogenia , Polimorfismo de Nucleotídeo Único , Infecções por Salmonella/prevenção & controle , Análise de Sequência de DNA
6.
Eur Rev Med Pharmacol Sci ; 27(8): 3243-3254, 2023 04.
Artigo em Inglês | MEDLINE | ID: mdl-37140275

RESUMO

OBJECTIVE: This systematic review aimed to assess if topical application of hyaluronic acid (HA) reduced complication rates after mandibular third molar (M3) surgery. MATERIALS AND METHODS: PubMed, CENTRAL, Embase, and Web of Science were searched for randomized controlled trials (RCTs) assessing the efficacy of topical hyaluronic acid for mandibular third molar surgery. Gray literature was also searched. RESULTS: 12 RCTs were included. Meta-analysis showed that pain scores were significantly reduced after M3 surgery with the use of HA on the 1st, 2nd/3rd, and 7th postoperative days. Using postoperative maximal mouth opening (MMO) data, we noted that MMO was significantly better in the HA group on the 2/3rd post-operative day but not on the 7th postoperative day. Meta-analysis of just three studies showed that swelling was significantly reduced on the 1st postoperative day with the use of HA, however, no such difference was noted on the 2nd/3rd and 7th postoperative days. Alveolitis and infection data were not reported by the majority of studies which precluded a meta-analysis. Grading of Recommendations Assessment, Development, and Evaluation (GRADE) certainty of evidence was low to moderate. CONCLUSIONS: Low-moderate quality of evidence suggests that topical application of HA may reduce pain as well as early trismus and swelling in patients undergoing M3 surgeries. The effect size of pain reduction is small thereby raising questions about its clinical significance. High inter-study heterogeneity and low-quality of trials are significant limitations. High-quality RCTs are needed to generate quality evidence.


Assuntos
Ácido Hialurônico , Dente Serotino , Humanos , Ácido Hialurônico/uso terapêutico , Dente Serotino/cirurgia , Edema , Dor , Trismo/etiologia , Dor Pós-Operatória/tratamento farmacológico , Dor Pós-Operatória/prevenção & controle , Complicações Pós-Operatórias/prevenção & controle , Complicações Pós-Operatórias/etiologia
7.
Phys Rev Lett ; 106(8): 083003, 2011 Feb 25.
Artigo em Inglês | MEDLINE | ID: mdl-21405569

RESUMO

Using first-principles theory and experiments, chemical contributions to surface-enhanced Raman spectroscopy for a well-studied organic molecule, benzene thiol, chemisorbed on planar Au(111) surfaces are explained and quantified. Density functional theory calculations of the static Raman tensor demonstrate a strong mode-dependent modification of benzene thiol Raman spectra by Au substrates. Raman active modes with the largest enhancements result from stronger contributions from Au to their electron-vibron coupling, as quantified through a deformation potential. A straightforward and general analysis is introduced to extract chemical enhancement from experiments for specific vibrational modes; measured values are in excellent agreement with our calculations.


Assuntos
Ouro/química , Fenóis/química , Análise Espectral Raman , Compostos de Sulfidrila/química , Adsorção , Modelos Moleculares , Conformação Molecular , Teoria Quântica , Propriedades de Superfície
8.
Genet Mol Res ; 10(4): 3371-84, 2011 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-22180074

RESUMO

The dopamine D2 receptor (DRD2) is a crucial mediator for normal physiological processes. We cloned the pig DRD2 gene, investigated its distribution in tissues and identified polymorphisms by RT-PCR, quantitative real-time PCR and direct sequencing. Two Yorkshire pigs from Guangdong Academy of Agricultural Sciences (Guangzhou, China) were selected to clone the gene and investigate its expression; 16 individuals from four pig breeds (Yorkshire, Landrace, small-ear spotted, and Xinchang) were used to scan the variations. The two transcripts (DRD2L and DRD2S), obtained through insertion or deletion of exon 5 and part of 3'UTR, were found to encode 444- and 415-amino acid proteins, respectively. The 574-bp indel in 3'UTR comprises five miRNA targeting sites, based on bioinformatics predictions. The pig DRD2 gene expresses predominantly in the pituitary gland, and then in oviducts and the hypothalamus. Both DRD2L and DRD2S mRNA were detected in cerebrum, cerebellum, hypothalamus, pituitary gland, back muscle, oviduct, uterus, and testis tissues; DRD2L was more abundant than DRD2S. The DRD2 gene is located on chromosome 9 and contains seven exons. Sixty-one different sequences were identified in this gene; among seven in the coding region, only one altered the encoded amino acid. These findings will help us understand the functions of the DRD2 gene in pigs.


Assuntos
Cruzamento , Regulação da Expressão Gênica , Variação Genética , Receptores de Dopamina D2/genética , Sus scrofa/genética , Regiões 3' não Traduzidas/genética , Sequência de Aminoácidos , Animais , Pareamento de Bases/genética , Sequência de Bases , Sítios de Ligação , China , Clonagem Molecular , DNA Complementar/genética , Feminino , Perfilação da Expressão Gênica , Genoma/genética , Masculino , MicroRNAs/genética , MicroRNAs/metabolismo , Dados de Sequência Molecular , Fases de Leitura Aberta/genética , Especificidade de Órgãos/genética , Polimorfismo de Nucleotídeo Único/genética , Ligação Proteica/genética , Receptores de Dopamina D2/química , Deleção de Sequência/genética
9.
Artigo em Inglês | MEDLINE | ID: mdl-21469009

RESUMO

The objective of this study was to assess the suitability of statistical and the k-C* models to projecting treatment performance of constructed wetlands by applying the models to predict the final effluent concentrations of a pilot field-scale constructed wetlands system (CWs) treating animal farm wastewater. The CWs achieved removal rates (in g/m(2).d) ranging from 7.1-149.8 for BOD(5), 49.8-253.8 for COD and 7.1-47.0 for NH(4)-N. Generally, it was found that the statistical models developed from multiple regression analyses (MRA) were stronger in predicting final effluent concentrations than the k-C* model. However, both models were inadequate in predicting the final effluent concentrations of NO(3)-N. The first-order area-based removal rate constants (k, m/yr) determined from the experimental data were 200.5 for BOD(5), 80.1 for TP and 173.8 for NH(4)-N and these indicate a high rate of pollutant removal within the CWs.


Assuntos
Modelos Estatísticos , Eliminação de Resíduos Líquidos/métodos , Poluentes Químicos da Água/análise , Purificação da Água/métodos , Áreas Alagadas , Agricultura , Compostos de Alúmen/química , Irlanda , Compostos de Nitrogênio/análise , Compostos Orgânicos/análise , Compostos de Fósforo/análise , Projetos Piloto , Esgotos/química
10.
Mol Endocrinol ; 12(11): 1721-32, 1998 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-9817598

RESUMO

The rat homeobox gene, rHox, was cloned from a rat osteosarcoma cDNA library. Southwestern and gel mobility shift analyses showed that rHox binds to the promoter regions of collagen (alpha1)I and osteocalcin genes while transient transfection with rHox resulted in repression of their respective promoter activities. In situ hybridization studies showed that rHox mRNA was widely expressed in osteoblasts, chondrocytes, skeletal muscle, skin epidermis, and bronchial and intestinal epithelial cells, as well as cardiac muscle in embryonic and newborn mice. However in 3-month-old mice, rHox mRNA expression was restricted to osteoblasts, megakaryocytes, and myocardium. Bone morphogenetic protein 2, a growth factor that commits mesenchymal progenitor cells to differentiate into osteoblasts, down-regulated rHox mRNA expression by 40-50% in UMR 201, a rat preosteoblast cell line, in a time- and dose-dependent manner. In contrast, PTH-related protein (PTHrP), recently shown to be a negative regulator of chondrocyte differentiation, significantly enhanced rHox mRNA expression in UMR 106-06 osteoblastic cells by 3-fold at 24 h while at the same time down-regulating expression of pro-alpha1(I) collagen mRNA by 60%. Expression of rHox mRNA in calvarial osteoblasts derived from PTHrP -/- mice was approximately 15% of that observed in similar cells obtained from normal mice. In conclusion, current evidence suggests that rHox acts as a negative regulator of osteoblast differentiation. Furthermore, down-regulation of rHox mRNA by bone morphogenetic protein 2 and its up-regulation by PTHrP support a role of the homeodomain protein, rHox, in osteoblast differentiation.


Assuntos
Proteínas Morfogenéticas Ósseas/farmacologia , Desenvolvimento Embrionário e Fetal/genética , Regulação da Expressão Gênica no Desenvolvimento , Genes Homeobox , Osteoblastos/efeitos dos fármacos , Proteínas/farmacologia , RNA Mensageiro/biossíntese , Ratos/genética , Fator de Crescimento Transformador beta , Animais , Proteína Morfogenética Óssea 2 , Diferenciação Celular , Linhagem Celular , Colágeno/biossíntese , Colágeno/genética , Relação Dose-Resposta a Droga , Hibridização In Situ , Camundongos , Camundongos Knockout , Especificidade de Órgãos , Osteoblastos/metabolismo , Proteína Relacionada ao Hormônio Paratireóideo
11.
Invest Ophthalmol Vis Sci ; 38(8): 1493-510, 1997 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-9224277

RESUMO

PURPOSE: To determine the nature and limits of visual improvement through repetitive practice in human adults with naturally occurring amblyopia. METHODS: A key measure the authors used was a psychophysical estimate of Vernier acuity; persons with amblyopia have marked deficits in Vernier acuity that are highly correlated with their loss of Snellen acuity. The experiment consisted of three phases: pretraining measurements of Vernier acuity and a second task (either line-detection thresholds or Snellen acuity) in each eye with the lines at two orientations; a training phase in which observers repetitively trained on the Vernier task at a specific line orientation until each had completed 4000 to 5000 trials; and posttraining measurements (identical to those in the first phase). Two groups of amblyopic observers were tested: novice observers (n = 6), who had no experience in making psychophysical judgments with their amblyopic eyes, and experienced observers (n = 5), who had previous experience in making Vernier judgments with their amblyopic eyes (with the lines at a different orientation) using the signal-detection methodology. RESULTS: The authors found that strong and significant improvement in Vernier acuity occurs in the trained orientation in all observers. Learning was generally strongest at the trained orientation but may partially have been transferred to other orientations (n = 4). Significant learning was transferred partially to the other eye (at the trained orientation) in two observers with anisometropic amblyopia. Improvement in Vernier acuity did not transfer to an untrained detection task. In two observers, the improvement in Vernier acuity was accompanied by a commensurate improvement in Snellen acuity. CONCLUSIONS: Some adults with amblyopia retain a significant degree of neural plasticity. Although several observers (primarily novices) showed evidence of generalized learning, several amblyopic patients showed evidence for improvement that was orientation and task specific. In this latter group of observers, the improvement appeared to reflect alterations that were, at least in part, in early neural processes that were orientation specific and were localized beyond the site of convergence of the two eyes.


Assuntos
Ambliopia/fisiopatologia , Psicofísica/métodos , Acuidade Visual , Adulto , Educação , Feminino , Humanos , Aprendizagem , Masculino , Pessoa de Meia-Idade , Plasticidade Neuronal , Limiar Sensorial , Percepção Visual
12.
Pediatr Dent ; 17(1): 46-53, 1995.
Artigo em Inglês | MEDLINE | ID: mdl-7899103

RESUMO

The temporomandibular joints (TMJ) of children afflicted with juvenile rheumatoid arthritis (JRA) were evaluated with clinical examinations and computed tomography (CT). Thirty-seven consecutive patients (6-17 years old) from the Texas Scottish Rite Hospital arthritis clinic were studied to investigate morphological abnormalities in the TMJ by CT. Both qualitative and quantitative measures of TMJ morphology were made from axial CT scans. Ten children without JRA served as a control group. Various ANOVA and nonparametric statistical models were used for analysis. Evidence of TMJ abnormalities from the CTs was found in 62% of these JRA children. The TMJ pathosis indices for left and right joints were significantly higher in the JRA subjects than those in the control children (P < 0.03) and joint spaces were narrower (P < 0.02). These features are indicative of TMJ destruction. Thus, there is considerable risk for TMJ involvement and its debilitating and deforming sequelae in children afflicted with JRA.


Assuntos
Artrite Juvenil/patologia , Transtornos da Articulação Temporomandibular/patologia , Articulação Temporomandibular/patologia , Adolescente , Análise de Variância , Artrite Juvenil/diagnóstico por imagem , Estudos de Casos e Controles , Criança , Feminino , Humanos , Masculino , Côndilo Mandibular/diagnóstico por imagem , Côndilo Mandibular/patologia , Valores de Referência , Razão de Masculinidade , Estatísticas não Paramétricas , Articulação Temporomandibular/diagnóstico por imagem , Transtornos da Articulação Temporomandibular/diagnóstico por imagem , Tomografia Computadorizada por Raios X
13.
Pediatr Dent ; 18(4): 312-9, 1996.
Artigo em Inglês | MEDLINE | ID: mdl-8857660

RESUMO

A study was undertaken to examine the relationship between the clinical signs and symptoms of temporomandibular joint (TMJ) disorder and computed tomographic (CT) evidence of destruction of these joints in children afflicted with juvenile rheumatoid arthritis (JRA). A thorough clinical examination including determination of the craniomandibular index (CMI) was performed on each of 37 consecutive JRA patients (6-17 years old), who had also received comprehensive evaluations of TMJ morphology by axial CT (see Part I, Pediatr Dent, 17:46-53, 1995). Measures of facial asymmetry (photographic) and mandibular size (cephalometric) also were collected. Published norms for mandibular dimensions and for prevalences of symptoms and signs of TMJ disorders served as control data. Various ANOVA and nonparametric statistical models were used for analysis. Average maximal opening was significantly less in the JRA subjects compared with the controls, and more than 50% of the JRA children manifested chin deviations or vertical disparities between mandibular angle regions, indicating compromised mandibular function and form. With the exception of facial asymmetry, however, none of the clinical signs or symptoms of TMJ dysfunction were remarkable predictors of bony destruction of the TMJ. Subjects with definitive evidence (CT) of TMJ destruction (62%) could not be identified reliably by any of the clinical measures used here. These findings indicate that clinical examination alone is inadequate for detecting condylar degeneration in the TMJ of children with JRA.


Assuntos
Artrite Juvenil/diagnóstico por imagem , Artrite Juvenil/patologia , Transtornos da Articulação Temporomandibular/diagnóstico por imagem , Transtornos da Articulação Temporomandibular/patologia , Adolescente , Análise de Variância , Artrite Juvenil/complicações , Artrografia , Cefalometria , Criança , Assimetria Facial/diagnóstico , Assimetria Facial/etiologia , Feminino , Humanos , Masculino , Mandíbula/crescimento & desenvolvimento , Côndilo Mandibular/diagnóstico por imagem , Côndilo Mandibular/patologia , Fotografação , Valores de Referência , Estatísticas não Paramétricas , Transtornos da Articulação Temporomandibular/complicações , Tomografia Computadorizada por Raios X
14.
Yao Xue Xue Bao ; 25(6): 457-61, 1990.
Artigo em Chinês | MEDLINE | ID: mdl-2284974

RESUMO

A method is described to determine metoprolol in plasma by GC-ECD. Metoprolol and alprenolol (internal standard) reacted rapidly with heptafluorobutyric anhydride under the catalysis of tetrahydrofuran (THF) after being extracted from plasma with cyclohexane. The derivatives produced quantitatively were identified by GC-MSD to be diheptafluorobutyl metoprolol and dihepatafluorobutyl alpredolol which were then separated and detected by 3% SE-30 packed glass column (2m x 3 mm) equipped with ECD. The detection limit was 1 ng/ml and the linear range was 10-1500 ng/ml (r = 0.9993). Average recovery from spiked plasma was 97.30%. The coefficient of variation of day-to-day and within-day were less than 8% and 7%, respectively. The method has been applied to investigate the pharmacokinetics and bioavailability of metoprolol and also applied to clinical monitoring of metoprolol levels in patients.


Assuntos
Metoprolol/sangue , Cromatografia Gasosa/métodos , Humanos
15.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao ; 23(6): 594-8, 2001 Dec.
Artigo em Chinês | MEDLINE | ID: mdl-12901105

RESUMO

OBJECTIVE: To study the significance of the unbalanced expression of Th1/Th2 type cytokines in human glioma. METHODS: The gene expressions of Th1/Th2 type cytokines in 62 specimens of human glioma tissues, 4 glioma cell lines, peripheral blood mononuclear cell (PBMC) of 15 glioma patients, 5 specimens of normal adult brain tissue and 5 brain meningioma tissues were detected by semiquantitative reverse transcription polymerase chain reaction. IFN-gamma and IL-2 represent Th1 type cytokines. IL-4, IL-6, IL-10 and IL-13 represent Th2 type cytokines. RESULTS: There were obviously predominant expression of Th2 type cytokines in glioma cell lines (P < 0.01) and specimens of human glioma tissues (P < 0.01). The tendency of distinct expression of Th2 type cytokines in PBMC was also existent. There wasn't obvious discrepancy of the expression of two type cytokines in normal adult brain tissues and meningioma tissues. CONCLUSIONS: It is likely that the switching of Th1/Th2 type cytokines in gliomas as predominant expression of Th2 type cytokine genes is related to the origination of gliomas and the evasion of glioma cells from immune surveillance.


Assuntos
Neoplasias Encefálicas/imunologia , Citocinas/biossíntese , Glioma/imunologia , Adolescente , Adulto , Idoso , Neoplasias Encefálicas/metabolismo , Linhagem Celular Tumoral , Criança , Feminino , Glioma/metabolismo , Humanos , Interleucinas/biossíntese , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Células Th1/metabolismo , Células Th2/metabolismo
16.
Zhongguo Yi Xue Ke Xue Yuan Xue Bao ; 23(6): 599-602, 2001 Dec.
Artigo em Chinês | MEDLINE | ID: mdl-12901106

RESUMO

OBJECTIVE: To study the influence of adjustment of balance of Th1/Th2 by external cytokines on proliferation of glioma cells. METHODS: The gene expressions of Th1/Th2 type cytokines in C6, 9L, U251 and SHG44 glioma cells were detected by semiquantitative reverse transcription polymerase chain reaction (RT-PCR). After the cells were induced with IFN-gamma + IL-4 McAb and IL-4 + IFN-gamma McAb respectively, we isolated the total RNA to proceed RT-PCR again. The evaluation of cell proliferation was proceeded by MTT assay method. RESULTS: There was obviously predominant expression of Th2 type cytokines in glioma cell lines (P < 0.01). The expression intensity of IFN-gamma was improved in IFN-gamma + IL-4 McAb groups and Th2 type cytokines were enhanced in IL-4 + IFN-gamma McAb groups. IFN-gamma and IL-4 McAb could cause the switch from Th2 to Th1, and could remarkably inhibit the proliferation of glioma cells in a dose-dependent way (P < 0.01). On the other hand, IL-4 and IFN-gamma McAb could strengthen the switch of Th2, and might stimulate the glioma cell growth, also in a dose-dependent way (P < 0.01). CONCLUSIONS: There is a Th2 preponderance in glioma cells. IFN-gamma and IL-4 McAb could regulate the switch from Th2 to Th0 or Th1, and inhibit the proliferation of glioma cells.


Assuntos
Anticorpos Monoclonais/farmacologia , Neoplasias Encefálicas/imunologia , Citocinas/genética , Glioma/imunologia , Neoplasias Encefálicas/patologia , Divisão Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Regulação da Expressão Gênica/efeitos dos fármacos , Glioma/patologia , Humanos , Interferon gama/genética , Interferon gama/imunologia , Interleucina-4/genética , Interleucina-4/imunologia , Interleucinas/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa
17.
Zhonghua Jie He He Hu Xi Za Zhi ; 13(4): 212-3, 254, 1990 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-2090349

RESUMO

The experiences in surgical treatment of 35 cases of spontaneous pneumothorax were reported. In 34 cases bullae or blebs were found during the operation. The operation is simple (inducing pleural adhesion by smearing pleura with iodine after local resection of bullae and blebs and with good results. No relapse occurred during 1-13 years followup. We suggest that operation should be considered for treating spontaneous pneumothorax in such cases including failure of medical management, relapse within a short time and more than two relapses. Most of the patients with impaired lung function and bilateral pneumothorax can be treated surgically as well.


Assuntos
Pneumotórax/cirurgia , Adolescente , Adulto , Idoso , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Recidiva , Ruptura Espontânea
18.
Bioresour Technol ; 111: 27-35, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-22357288

RESUMO

Step-feeding strategies have been extensively studied and comprehensively analyzed in this study for a four-stage alum sludge-based tidal flow constructed wetlands (AlS-TFCWs) system. Enhanced total nitrogen removal of 83% is achieved under high nitrogen loading rate of 19.1 g N/m(2)d. The key issues towards the success of a significant nitrogen removal in step-feeding TFCWs are the bed resting time (which provides better aeration for nitrification) and up flow stage/delayed input of side stream(s) (which ensure favorable environment for better denitrification). Simultaneous nitrification and denitrification (SND) was found effective in the 1st stage of the system and SND via nitrite is the main nitrogen conversion mechanism. The optimal influent distribution fraction for step-feeding purpose can be estimated from a theoretical basis, which is a function of the influent BCOD/TKN ratio. Therefore the influent distribution fraction should be adjusted according to the variety of influent characteristics, rather than a fixed value.


Assuntos
Compostos de Alúmen/química , Nitrogênio/isolamento & purificação , Esgotos , Áreas Alagadas , Movimentos da Água
19.
J Int Med Res ; 40(4): 1499-506, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22971502

RESUMO

OBJECTIVES: This study investigated spontaneous dorsal horn potentials in patients with pain after brachial plexus avulsion and determined the effect of dorsal root entry zone (DREZ) lesioning on these potentials and on pain levels. METHODS: Electrospinography (ESG) recordings were undertaken in seven patients using a noninvasive electrocorticography strip electrode. Measurements were taken from the DREZ on the intact side of the spinal cord before lesioning of the injured DREZ and from the injured DREZ before and after lesioning. RESULTS: DREZ lesioning had a significant positive effect on pain at 12 months postoperatively. At 15.0 Hz, the mean ESG power from the injured DREZ before lesioning was significantly higher than that from the intact DREZ. In addition, the mean ESG power from the injured DREZ after successful DREZ lesioning was significantly lower than that from the intact DREZ and that from the injured DREZ before lesioning. CONCLUSIONS: The ESG power from the injured DREZ increases in patients with pain after brachial plexus avulsion compared with that of the intact DREZ; this increase is reduced by successful DREZ lesioning.


Assuntos
Potenciais de Ação , Neurite do Plexo Braquial/cirurgia , Plexo Braquial/lesões , Células do Corno Posterior/fisiopatologia , Raízes Nervosas Espinhais/cirurgia , Adulto , Idoso , Neurite do Plexo Braquial/fisiopatologia , Vértebras Cervicais/cirurgia , Denervação , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estatísticas não Paramétricas
20.
J Int Med Res ; 40(1): 126-33, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22429352

RESUMO

OBJECTIVE: Previous studies have indicated that diffusion tensor imaging (DTI) values are related to clinical outcome in stroke patients. This prospective study explored whether DTI values were predictive for hand function outcome in chronic stroke patients. METHODS: The DTI parameters (rλ1, rλ23, fractional anisotropy [rFA] and mean diffusivity [rMD]) were investigated in patients with completely paralysed hands (CPH; n=10) or partially paralysed hands (PPH; n=10), by two methods of analysis: segment of the corticospinal tract [sCST] analysis; pure region of interest [ROI] analysis. Spearman's correlation coefficient was used to assess the correlation between the DTI parameters and the following clinical measures: Fugl-Meyer Assessment [FMA]; National Institutes of Health Stroke Scale [NIHSS]. RESULTS: Significant differences were found between CPH and PPH for rFA and rλ23 (sCST analysis) and for rMD and rλ23 (ROI analysis). The rλ23 (sCST analysis) correlated with the NIHSS; the rMD (sCST analysis) correlated with the FMA (hand). CONCLUSION: The three parameters, rFA, rλ23 and rMD may have predictive value for evaluating hand function outcome in chronic stroke patients.


Assuntos
Imagem de Tensor de Difusão/métodos , Mãos/fisiopatologia , Atividade Motora/fisiologia , Acidente Vascular Cerebral/fisiopatologia , Doença Aguda , Idoso , Doença Crônica , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Paralisia/fisiopatologia , Tratos Piramidais/fisiopatologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA