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排序方式: 共有64条查询结果,搜索用时 46 毫秒
1.
Moïse Nola Mireille E. Nougang Olive V. Noah Ewoti Luciane M. Moungang François Krier Nour‐Eddine Chihib 《Water and Environment Journal》2013,27(3):328-337
This study was aimed at assessing the prevalence of pathogenic Escherichia coli strains, relative to the total count of E. coli, faecal coliforms and other heterotrophic mesophilic aerobic bacteria (HMAB) isolated in groundwater in the equatorial region of Cameroon (Central Africa). Bacteria were isolated using standard methods. Pathogenic E. coli strains were then identified using haemagglutination and antisera tests. The maximum abundance of HMAB, faecal coliforms and E. coli strains were 4.9 × 106, 5.6 × 103 and 1 × 103 colony‐forming units (CFU)/100 mL, respectively. The count of pathogenic E. coli strains reached 3 CFU/100 mL. The counts of commensal and pathogenic E. coli strains underwent temporal and spatial fluctuations. In 21% of sampling sites, the abundance of faecal coliforms was significantly correlated to that of E. coli (P < 0.05). However, the isolated bacterial count was not significantly correlated to that of the pathogenic E. coli strains (P > 0.05). The bacteria abundance dynamics may be impacted by many interacting factors. 相似文献
2.
Luciane Madureira Almeida Juliana Ferreira Floriano Thuanne Pires Ribeiro Lais Nogueira Magno Lígia Souza Lima Silveira da Mota Nei Peixoto Fátima Mrué Paulo Melo-Reis Ruy de Souza Lino Junior Carlos Frederico de Oliveira Graeff Pablo José Gonçalves 《Journal of materials science. Materials in medicine》2014,25(9):2153-2162
The latex obtained from Hancornia speciosa is used in folk medicine for treatment of several diseases, such as acne, warts, diabetes, gastritis and inflammation. In this work, we describe the biocompatibility assessment and angiogenic properties of H. speciosa latex and its potential application in medicine. The physical–chemical characterization was carried out following different methodologies (CHN elemental analyses; thermogravimetric analyses and Fourier transform infrared spectroscopy). The biocompatibility was evaluated through cytotoxicity and genotoxicity tests in fibroblast mouse cells and the angiogenic properties were evaluated using the chick chorioallantoic membrane (CAM) assay model. The physical–chemical results showed that the structure of Hancornia speciosa latex biomembrane is very similar to that of Hevea brasiliensis (commercially available product). Moreover, the cytotoxicity and genotoxicity assays showed that H. speciosa latex is biocompatible with life systems and can be a good biomaterial for medical applications. The CAM test showed the efficient ability of H. speciosa latex in neovascularization of tissues. The histological analysis was in accordance with the results obtained in the CAM assay. Our data indicate that the latex obtained from H. speciosa and eluted in water showed significant angiogenic activity without any cytotoxic or genotoxic effects on life systems. The same did not occur with H. speciosa latex stabilized with ammonia. Addition of ammonia does not have significant effects on the structure of biomembranes, but showed a smaller cell survival and a significant genotoxicity effect. This study contributes to the understanding of the potentialities of H. speciosa latex as a source of new phytomedicines. 相似文献
3.
Julia E. Tasca Agustín Ponzinibbio Gisela Diaz Rodolfo D. Bravo Araceli Lavat María G. González 《Topics in Catalysis》2010,53(15-18):1087-1090
An efficient protocol for the rapid room temperature deacetylation of carbohydrate derivatives using CuFe2O4 nanoparticles as an inexpensive and reusable catalyst is presented. After separation of the catalyst with an external magnet, the reaction products are easily obtained in good purity and excellent yields. 相似文献
4.
Tasca Giorgio A.; Ramsay Tim; Corace Kimberly; Illing Vanessa; Bone Meagan; Bissada Hany; Balfour Louise 《Canadian Metallurgical Quarterly》2010,14(2):151
Many community- and hospital-based group treatment programs have an open enrolment, that is, a rolling admissions structure, in which a group member who drops out or successfully completes therapy is replaced by another individual. Although practically efficient and perhaps clinically useful, the interdependence of these group participants' data may result in incorrect inferences drawn from the data analyses if this interdependence is not accounted for. We present an analytic strategy that uses time varying covariates in multilevel models to illustrate a methodology to address these data analysis problems. Participants were adults with eating disorders (N = 229) who attended an average of 12 weeks of a rolling admissions group-based day hospital program during an 8-year period, and who completed a group therapy alliance measure weekly. Individual alliance to the group increased from week to week, and this growth remained significant even after controlling for the time varying level of other group members' alliance to the group. Further, the level of an individual's alliance score during any given week was positively related to the group's alliance during that week. The multilevel time varying covariate models presented here add to a very small but emerging set of analytic strategies available for researchers to address some of the hurdles to correctly analyze data from rolling admissions group-based treatment programs. Results from this study provide evidence that a group's culture is passed on and affects an individual's alliance to the group despite changes in group membership. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
5.
Implications of attachment theory and research for the assessment and treatment of eating disorders.
In this paper, we review the research literature on attachment and eating disorders and suggest a framework for assessing and treating attachment functioning in patients with an eating disorder. Treatment outcomes for individuals with eating disorders tend to be moderate. Those with attachment-associated insecurities are likely to be the least to benefit from current symptom-focused therapies. We describe the common attachment categories (secure, avoidant, anxious), and then describe domains of attachment functioning within each category: affect regulation, interpersonal style, coherence of mind, and reflective functioning. We also note the impact of disorganized mental states related to loss or trauma. Assessing these domains of attachment functioning can guide focused interventions in the psychotherapy of eating disorders. Case examples are presented to illustrate assessment, case formulation, and group psychotherapy of eating disorders that are informed by attachment theory. Tailoring treatments to improve attachment functioning for patients with an eating disorder will likely result in better outcomes for those suffering from these particularly burdensome disorders. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
6.
7.
Tasca Dante M. Peden Joseph C. Miletta Joseph 《IEEE transactions on nuclear science》1972,19(6):57-67
The feasibility of developing nondestructive screening techniques to determine the second breakdown vulnerability of semiconductor devices at submicrosecond pulse conditions has been demonstrated. In addition, it has been shownl that second breakdown can be nondestructively initiated under certain current limiting conditions without causing degradation in device operating characteristics or device second breakdown vulnerability level to subsequent pulses of electrical energy. A low energy current impulse damage mechanism at second breakdown initiation has also been observed. The experimental investigations were performed using 1N4148 diodes fabricated with various junction areas and a fixed diffusion depth. The complete results of this work are documented in Reference 1. 相似文献
8.
Polyurethane networks from formiated soy polyols: Synthesis and mechanical characterization 总被引:1,自引:1,他引:0
Luciane?L.?Monteavaro Eduardo?O.?da?Silva Ana?Paula?O.?Costa Dimitrios?Samios Annelise?E.?Gerbase Cesar?L.?PetzholdEmail author 《Journal of the American Oil Chemists' Society》2005,82(5):365-371
Polyurethanes can be prepared using polyols obtained from vegetable oils in natura, such as castor oil, or from functionalized vegetable oils, such as hydroxylated soybean oil. These polyurethanes have different
valuable properties, determined by their chemical composition and cross-linking density. In this study, soy epoxy polyols
with different OH contents were prepared through a one-step reaction using the method of in situ performic acid generation. Polyols with OH functionalities from 1.9 to 3.2 were reacted in bulk with different diisocyanates
at a NCO/OH molar ratio of 0.8 and 60°C for 24 h. Mechanical properties of the polyurethanes were determined by dynamic mechanical
thermal analysis, hardness (Shore A), and swelling measurements. Polymer networks with glass-transition temperatures (T
g
) from −13 to 48°C were obtained. We observed that the higher the OH functionality of the polyols, the higher the T
g
and cross-linking density of the polyurethane network. The influence of diisocyanate structure (rigid or flexible chain),
curing temperature, and curing reaction time on mechanical properties was also investigated. 相似文献
9.
Andrea Luca Tasca Eleonora Stefanelli Anna Maria Raspolli Galletti Riccardo Gori Gemma Mannarino Sandra Vitolo Monica Puccini 《化学工程与技术》2020,43(12):2382-2392
Hydrothermal carbonization of sewage sludge was carried out with the aim to evaluate the influence of process severity and initial solid content. Response surface methodology was applied to model yield and C yield responses. Enhanced dewaterability performance was recorded under mild processing conditions. The treatment promoted concentration and immobilization of Pb, Cd, Ni, Zn, and Cu. Variation of the solid content showed a stronger influence than severity on average yield and C yield. Higher heating values (HHVs) and energy retention efficiencies (EREs) of hydrochars obtained at the lowest solid content displayed the lowest values. Hence, the energy requirements of a first dewatering step should be compared with the related improvement in terms of HHV and ERE when sludge is used as feedstock. 相似文献