2,910 research outputs found
Removal of Zn2+ in aqueous solution by Linde F (K) zeolite prepared from recycled fly ash
No full textSchool of Biology and Chemical Engineering, Jiangsu University of Science and Technology,
Zhenjiang 212018, China
E-mail : [email protected]
epartment of City Science, Jiangsu City Vocational College, Nanjing 210036, China
Jiangsu Provincial Academy of Environmental Science, Key Laboratory of Environmental Engineering,
Nanjing 210036, China
Manuscript received online 19 February 2013, revised 27 April 2013, accepted 28 May 2013
Linde F (K) zeolite is used for removing ZnII from aqueous solution. The zeolite is synthesized between fly ash and 8 M KOH solution by hydrothermal process (liquid/solid = 5 and 95 ºC). The XRD and SEM-EDS are used to study zeolite characteristics. The studying experiment parameters are adsorption temperature, zeolite dosage and solution pH. The results show that ZnII removal could be improved by increasing temperature. The optimal solution pH and most efficient zeolite dosage is 7 and 5 g/L respectively. Pseudo-second order model and Langmuir isotherm shows better calculation results for the adsorption of ZnII on Linde F (K). The endothermic adsorption process is spontaneous and the adsorption becomes more spontaneous with temperature increasing
Nitrogen metabolism and milk production in dairy cows fed semi-restricted amounts of ryegrass-legume silage with birdsfoot trefoil (Lotus corniculatus L.) or white clover (Trifolium repens L.)
No full textIn change-over trials, mid-lactation dairy cows were fed concentrate-supplemented, isonitrogenous and isofibrous perennial ryegrasslegume silage diets that satisfied energy requirements but were suboptimal with respect to metabolizable protein supply. Legumes were either birdsfoot trefoil with low levels of condensed tannins (typical for hemiboreal conditions), or white clover. Averaged over two experimental years, birdsfoot trefoilbased silage resulted in lower digestibility (P < 0.001) of dry matter (50 g kg(-1)), organic matter (52 g kg(-1)), neutral detergent fibre (120 g kg(-1)) and nitrogen (24 g kg(-1)) and lower rumen total volatile fatty acid concentration (7 mm; P = 0.009). Milk protein yield was 36 g d(-1) higher with birdsfoot trefoil silage (P = 0.002), while raw milk yield tended to be 0.8 kg d(-1) higher (P = 0.06). Rumen ammonia concentration was similar between diets, but milk urea concentration (P < 0.001), urinary urea excretion (P = 0.002) and faecal-N proportion (P = 0.001) were higher with birdsfoot trefoil silage. The results suggest that grassbirdsfoot trefoil silage produced in hemiboreal areas exhibits a protein-sparing effect in dairy rations, despite a low condensed tannin content that is further diluted by companion grasses and ration concentrate proportion
Reporting Experiments in Homeopathic Basic Research (REHBaR) - a Guideline for Authors
No full textReporting experiments in basic research in homeopathy is an important issue as comprehensive description of what exactly was done is required. So far, there is no guideline for authors available, unlike criteria catalogues common in clinical research.
A Delphi Process was conducted, including a total of five rounds, three rounds of adjusting and phrasing plus two consensus conferences. European researchers who published experimental work within the last five years were involved.
A checklist of 23 items was obtained and supplemented with detailed examples emphasizing what each item implies. Background, objectives and possible hypotheses should be given in the part ‘introduction’. Special emphasis is put on the ‘materials
and methods’ section, where a detailed description of chosen controls, object of investigation, experimental setup, replication, parameters, intervention, allocation, blinding, and statistical methods is required. The section ‘results’ should present sufficient details on analysed data, descriptive as well as inferential. Authors should discuss their results and give an interpretation in the context of current evidence.
Conclusion: A guideline for Reporting Experiments in Homeopathic Basic Research (REHBaR) was compiled to be applied by authors when preparing their manuscripts, and to be used by scientific journals in the reviewing process. Furthermore the guideline
is a commitment to a certain minimum quality level needed in basic research, e.g. blinding and randomisation. Feedback is encouraged on applicability, strength and limitations of the list to enable future revisions
On the Versatility of Nanozeolite Linde Type L for Biomedical Applications: Zirconium-89 Radiolabeling and in Vivo Positron Emission Tomography Study
No full textPorous materials, such as zeolites, have great potential for biomedical applications, thanks to their ability to accommodate positively charged metal-ions and their facile surface functionalization. Although the latter aspect is important to endow the nanoparticles with chemical/colloidal stability and desired biological properties, the possibility for simple ion-exchange enables easy switching between imaging modalities and/or combination with therapy, depending on the envisioned application. In this study, the nanozeolite Linde type L (LTL) with already confirmed magnetic resonance imaging properties, generated by the paramagnetic gadolinium (GdIII) in the inner cavities, was successfully radiolabeled with a positron emission tomography (PET)-tracer zirconium-89 (89Zr). Thereby, exploiting 89Zr-chloride resulted in a slightly higher radiolabeling in the inner cavities compared to the commonly used 89Zr-oxalate, which apparently remained on the surface of LTL. Intravenous injection of PEGylated 89Zr/GdIII-LTL in healthy mice allowed for PET-computed tomography evaluation, revealing initial lung uptake followed by gradual migration of LTL to the liver and spleen. Ex vivo biodistribution confirmed the in vivo stability and integrity of the proposed multimodal probe by demonstrating the original metal/Si ratio being preserved in the organs. These findings reveal beneficial biological behavior of the nanozeolite LTL and hence open the door for follow-up theranostic studies by exploiting the immense variety of metal-based radioisotopes. BT/Biocatalysi
Life Stories The Creation of Coherence
No full textAll adult speakers in Western cultures have life stories argues Charlotte Linde, and the ways in which these life stories are formed and exchanged with others have a powerful effect on all of us. Life stories express our sense of self, who we are and how we got that way. According to Linde, we also use these stories to show that our lives can be understood as coherent, and to assert or negotiate group membership. These life stories take part in the highest level of social constructions, since they are built on cultural assumptions about what is expected in a life, what the norms for a successful life are, and what common or special belief systems are necessary to establish coherence. The life story, illuminated by this engrossing study, is a form of everyday discourse which has not previously been precisely defined or studied. It is an oral, discontinuous unit, consisting of stories which are retold in a variety of forms over a long period of time, and which may be revised and changed as the speaker comes to drop old meanings and add new ones to parts of the life story. The life story is a particularly rich and important area for study, because it represents a crossroads of linguistic structure and social practice. Linde's analysis is of importance to linguistics, as well as having broader implications for anthropology, psychology, and sociology.Intro -- CONTENTS -- A NOTE ON TRANSCRIPTION CONVENTIONS -- 1. The Creation of Coherence in Life Stories: An Overview -- 2. What Is a Life Story? -- 3. Methods and Data for Studying the Life Story -- 4. Narrative and the Iconicity of the Self -- 5. Coherence Principles: Causality and Continuity -- 6. Coherence Systems -- 7. Common Sense and Its History -- 8. Conclusion -- REFERENCES -- INDEX -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- V -- W -- ZAll adult speakers in Western cultures have life stories argues Charlotte Linde, and the ways in which these life stories are formed and exchanged with others have a powerful effect on all of us. Life stories express our sense of self, who we are and how we got that way. According to Linde, we also use these stories to show that our lives can be understood as coherent, and to assert or negotiate group membership. These life stories take part in the highest level of social constructions, since they are built on cultural assumptions about what is expected in a life, what the norms for a successful life are, and what common or special belief systems are necessary to establish coherence. The life story, illuminated by this engrossing study, is a form of everyday discourse which has not previously been precisely defined or studied. It is an oral, discontinuous unit, consisting of stories which are retold in a variety of forms over a long period of time, and which may be revised and changed as the speaker comes to drop old meanings and add new ones to parts of the life story. The life story is a particularly rich and important area for study, because it represents a crossroads of linguistic structure and social practice. Linde's analysis is of importance to linguistics, as well as having broader implications for anthropology, psychology, and sociology.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Are Sham Acupuncture Interventions More Effective than (Other) Placebos? A Re-Analysis of Data from the Cochrane Review on Placebo Effects
No full textBackground and Objective: A recent Cochrane review on placebo interventions for all kinds of conditions found that `physical placebos' (which included sham acupuncture) were associated with larger effects over no-treatment control groups than `pharmacological placebos'. We re-analyzed the data from this review to investigate whether effects associated with sham acupuncture differed from those of other `physical placebos'. Methods: All trials included in the Cochrane review as investigating `physical placebos' were classified as investigating either (sham) acupuncture or other physical placebos. The latter group was further subclassified into groups of similar interventions. Data from the Cochrane review were re-entered into the RevMan 5 software for meta-analysis. The primary analysis was a random-effects analysis of trials reporting continuous outcomes of trials that used either sham acupuncture or other physical placebos. Results: Out of a total of 61 trials which reported a continuous outcome measure, 19 compared sham acupuncture and 42 compared other physical placebos with a no-treatment control group. The trials re-analyzed were highly heterogeneous regarding patients, interventions and outcomes measured. The pooled standardized mean difference was -0.41 (95% confidence interval -0.56, -0.24) between sham acupuncture and no treatment and -0.26 (95% CI -0.37, -0.15) between other physical placebos and no treatment (p value for subgroup differences = 0.007). Significant differences were also observed between subgroups of other physical placebos. Conclusion: Due to the heterogeneity of the trials included and the indirect comparison our results must be interpreted with caution. Still, they suggest that sham acupuncture interventions might, on average, be associated with larger effects than pharmacological and other physical placebos
Reply to comment by A. Revil and N. Linde on 'Streaming potential dependence on water-content in Fontainebleau sand'
No full textInternational audienceRevil and Linde recently commented our paper concerning streaming potential (SP) mea- surements in unsaturated sand during drainage experiments. This comment suggests that the approach used to infer SP coefficients was inappropriate for unsaturated conditions, and there- fore yielded wrong conclusions and 'unphysical' results regarding the behaviour of the relative SP coefficient. This reply argues that even if in Allègre et al. we neglected some secondary electrokinetic sources, the resulting conclusions are still representative of the behaviour of the true SP coefficient, and that the remarks of Revil & Linde arose from a misunderstanding of the drainage experiment conditions. We also find support for our results from a comparison between our observations and previous experimental studies
Synthesis of zeolites and their application as soil amendments to increase crop yield and potentially act as controlled release fertilizers.
No full textA Thesis Submitted in partial fulfilment of the requirements of the University of Wolverhampton for the degree of Doctor of Philosophy.Zeolites have been used in agriculture since the 1960s, due to the effectiveness of these crystalline microporous solids as soil amendments for plant growth, their cation exchange capacity (CEC) and slow-release fertilizer properties. Most work on slow-release fertilizers has focused on natural Clinoptilolite, Phillipsite and Chabazite. The aim of this study was to synthesize zeolites, study their effectiveness as soil amendments and their ability to act as controlled release fertilizers to decrease nitrate leaching. Nitrate pollution of groundwater is a major agro-environmental concern. The zeolites Phillipsite and Linde-type F were synthesized from aluminosilicate gels; ion exchanged to introduce ammonium and characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Thermo-gravimetric analysis (TGA) and Scanning electron microscopy (SEM) techniques, both before and after ion exchange. Ammoniumexchanged Phillipsites (natural and synthetic), ammonium-exchanged synthetic Linde-type F (the zeolite having highest affinity towards ammonium) and ammonium exchanged Phillipsites (high crystalline and high aluminium) were compared with conventional NPK fertilizer.Three glasshouse experiments were performed to study the effects of zeolite-amended soils on maize growth. Ion exchanged synthetic and natural Phillipsites were first used as soil amendments (w/w 2, 4, 8% zeolite to soil). Synthetic Phillipsite, at 2% loading, resulted in the most significant improvement in both plant growth and phased ammonium release. The synthetic ammonium-exchanged zeolites Phillipsite and Linde-type F (at w/w 1, 2, 4%) were then compared; synthetic Phillipsite, at 2% loading, again resulted in the most significant plant growth response with an increase (≥15%) in shoot dry weight and a decrease (≥30%) in nitrate leaching. Experiments using unexchanged synthetic Phillipsite (at w/w 2%), but with added NPK fertilizer, showed increased plant growth and decreased nitrate leaching, compared with parallel experiments containing unexchanged synthetic Linde-type F (at w/w 2%) and a conventional fertilizer amended soil. This revealed the beneficial effect of Phillipsite for soil amendment, even without ion exchange to the ammonium form. To study the physico-chemical properties affecting the release of ammonium from the Phillipsite framework; high crystalline/low aluminium and low crystalline/high aluminium forms were synthesized and ion exchanged. Both forms were introduced as soil amendments (at w/w 1 and 2%) and experiments showed that the lower zeolite crystallinity decreased cation exchange and therefore decreased nitrate leaching. Experimental results from the glasshouse experiments and cation exchange capacity (CEC) experiments suggest that synthetic Phillipsite, at lower loadings (1 and 2% w/w zeolite to soil) have most potential as soil amendments for both plant growth and controlled-release applications. This conclusion is supported by soil leachate and shoots dry weight analysis. Furthermore, Phillipsite, synthesized in a low crystalline and low ammonium form, may be an even better soil amendment for controlled release of ammonium, which will thereby further decrease nitrate pollution
Acupuncture in Seasonal Allergic Rhinitis (ACUSAR) - Design and Protocol of a Randomised Controlled Multi-Centre Trial
No full textBackground: We report on the study design and protocol of a randomised controlled trial (Acupuncture in Seasonal Allergic Rhinitis, ACUSAR) that investigates the efficacy of acupuncture in the treatment of seasonal allergic rhinitis (SAR). Objective: To investigate whether acupuncture is non-inferior or superior to (a) penetrating sham acupuncture and (b) rescue medication in the treatment of SAR. Design: 3-armed, randomised controlled multi-centre trial with a total follow-up time of 16 weeks in the 1st year and 8 weeks in the 2nd year. Setting: 41 physicians in 37 out-patient units in Germany specialised in acupuncture treatment. Patients: 400 seasonal allergic rhinitis patients with clinical symptoms and test-positive (skin-prick test and/or specific IgE) to both birch and grass pollen. Interventions: Patients will be randomised in a 2:1:1 ratio to one of three groups: (a) semi-standardised acupuncture plus rescue medication (cetirizine); (b) penetrating sham acupuncture at non-acupuncture points plus rescue medication; or (c) rescue medication alone for 8 weeks (standard treatment group). Acupuncture and sham acupuncture will consist of 12 treatments per patient over 8 weeks. Main Outcome Measures: Average means of the Rhinitis Quality of Life Questionnaire (RQLQ) overall score and the Rescue Medication Score (RMS) between weeks 6 and 8 in the first year, adjusted for baseline values. Outlook: The results of this trial available in 2011 will have a major impact on the decision of whether acupuncture should be considered as a therapeutic option in the treatment of SAR
Seasonal differences in obstructive sleep apnea severity. Results from the European Sleep Apnea Database (ESADA)
No full text24th Congress of the European-Sleep-Research-Society (ESRS) -- SEP 25-28, 2018 -- Basel, SWITZERLANDEuropean Sleep Res SocVitalAire; Linde-HealthcareThe first author receives travelling grants from VitalAire and Linde-Healthcare
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