48,892 research outputs found
Milnesium dornensis Ciobanu, Roszkowska & Kaczmarek 2015, sensu lato
No full text45. Milnesium dornensis Ciobanu, Roszkowska & Kaczmarek, 2015 sensu lato [T] Milnesium cf. doRnensis Ciobanu et al., 2015? (Gąsiorek et al. 2017) Terra typica: Romania (Europe) Tunisia: • 36°46'27''N, 08°46'18''E; 501 m asl: Jendouba Governorate, Beni M'tir, forest, moss on soil. Gąsiorek et al. (2017) Record numbers. Tunisia: 1; total: 1. Remarks. The species has previously only been reported from its type locality and this African locality, which needs confirmation.Published as part of Kaczmarek, Łukasz, 2017, Annotated zoogeography of non-marine Tardigrada. Part IV: Africa, pp. 1-74 in Zootaxa 4284 (1) on page 20, DOI: 10.11646/zootaxa.4284.1.1, http://zenodo.org/record/101040
The equation x^py^q=z^r and groups that act freely on \Lambda-trees
No full textLet be a finitely generated group that acts freely on a -tree, where is an ordered abelian group, and let be elements in . We show that if with integers , , , then , and commute
An Analysis of Correlative and Static Causality in P Systems
No full textIn this paper we present two approaches, namely correlative and static causality, to study cause-effect relationships in reaction models and we propose
a framework which integrates them in order to study causality by means of transition P systems. The proposed framework is based on the fact that statistical analysis can be used to building up a membrane model which can be used to analyze causality relationships in terms of multisets of objects and rules in presence of non-determinism and parallelism.We prove that the P system which is defined by means of correlation analysis provides a correspondence between the static and correlative notions of causality
Biochemical assessment of growth factors and circulation of blood components contained in the different fractions obtained by centrifugation of venous blood.
No full textThe aim of this study was to evaluate a biochemical marker with different elements of a normal blood serum and centrifuged blood serum after a different rotation system. For this technique, we used five fractions of a blood Concentrated Growth Factors system (bCGF) and a particular device for the different rotation program. Blood samples were collected from 10 volunteers aged between 35 and 55 in the Operative Unit of the Sapienza University of Rome with only a fraction of different biochemical elements. Through an individual blood phase separator tube of venous blood, active factions of serum and 4 fractions of red buffy coat were taken. The biochemical markers with 14 elements were examined at times: P1-11 minutes, P2-12minutes, P3-15 minutes. Exclusively biological materials which are normally applied in the regeneration techniques for different defects and lesions were used with this technique. After specific rotation programs, a different result was obtained for each cycle: P1, P2, P3. In test tubes obtained by separated blood, we observed a higher concentration of proteins, ions, and other antigens compared to normal blood plasma. Examining the biochemical results of different elements, we observed an increase (P≤0,01). Since each persons DNA is different, we could not have the same results in 5 fractions of blood concentration, we did, however, find a good increase in only a fraction of proteins, immunoglobulin and different ions. We obtained five fractions after centrifugation, and we had an increase in different biochemical elements compared to normal blood (P≤0,01) which is significant at different times. These biochemical elements were stimulated by different growth factors, which are used by the immune system, and they induced the formation of hard and soft tissues and good regeneratio
Sol-gel treatments on cotton fabrics for improving thermal and flame stability : effect of the structure of the alkoxysilane precursor
No full textSol-gel treatments have been performed on cotton fabrics in order to promote the formation of a surface silica insulating barrier, able to enhance their thermo-oxidative stability and flame retardancy. In particular, the role of several silica precursors, which differ as far as their structure (number and type of hydrolysable groups, presence of aromatic rings) is concerned, has been thoroughly investigated. The level of silica distribution and dispersion on and within the fabrics was found to depend on the type of precursor employed, as revealed by scanning electron microscopy and elemental analysis. All the precursors were able to favour the char formation in air below 360 °C, as stated by thermogravimetric analysis: in particular, the highest thermal stability was achieved in the presence of precursors bearing aromatic rings. Indeed, both flammability resistance and combustion behaviour of the treated fabrics were remarkably enhanced
Novel flame retardant finishing systems for cotton fabrics based on phosphorus-containing compounds and silica derived from sol-gel processes
No full textCotton fabrics have been subjected to sol-gel processes performed in the presence of phosphorus-based compounds, in order to prepare a novel flame retardant finishing system. The effect of the concurrent presence of phosphorus and silica on the flame retardancy and combustion behaviour of cotton has been assessed through flammability tests and cone calorimetry, respectively. Furthermore, the improved thermo-oxidative stability of the treated fabrics has been evaluated by thermogravimetric analysis in air. The obtained results have shown the efficiency of the novel flame retardant finishing system and its durability, as well
Cotton fabrics treated with hybrid organic-inorganic coatings obtained through dual-cure processes
No full textCotton fabrics were treated with a hybrid organic-inorganic coating obtained through a dual-cure process, i. e. a photopolymerization reaction followed by a thermal treatment for promoting the formation of silica phases through a sol-gel process. To this aim, different amounts of a silica precursor were added to an acrylic UV-curable formulation in the presence of a suitable coupling agent. The thermo-mechanical properties of the treated fabrics were investigated and correlated to the composition and morphology of the hybrid organic-inorganic system. Furthermore, their flame retardancy and combustion behavior were evaluated by flammability tests and cone calorimetry and compared with the performances of pure cotton
Thermal stability, flame retardancy and mechanical properties of cotton fabrics treated with inorganic coatings synthesized through sol-gel processes
No full textCotton was sol-gel treated employing several metal alkoxide precursors (namely, tetraethylortho-silicate, -titanate, -zirconate and aluminium isopropylate) in order to get inorganic phases able to improve the thermal stability and flame retardancy of the fabric, without changing its mechanical features. Indeed, after the sol-gel treatment the fibre/fabric surface was morphologically modified: a homogeneous and compact film located in the fibre interstices (warp and weft) and partially covering their walls was observed for all the systems investigated. These coatings turned out to be responsible of an overall enhancement of the thermal and fire stability of the fabrics preserving, at the same time, the original mechanical properties of the neat cotton in terms of tensile strength and deformation. In addition, such inorganic coatings increased the abrasion resistance of the cotton in a remarkable way
Sol-gel treatments for enhancing flame retardancy and thermal stability of cotton fabrics: optimisation of the process and evaluation of the durability
No full textCotton fabrics have been treated by sol-gel processes in order to create a silica compact coating on the fibres to enhance their thermal stability and flame retardancy. The effect of process parameters such as silica precursor:water molar ratio and drying conditions (temperature and time) has been thoroughly investigated, aiming at optimization of target properties. Thermogravimetry and cone calorimetry have been respectively used to assess thermal stability and combustion behaviour of treated fabrics. Coating durability to different washing programmes has been evaluated as well
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