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  • 1
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    A new species of Dugesia (Platyhelminthes, Tricladida, Dugesiidae) from China, with an account on the histochemical structure of its major nervous system (2020)
    Pensoft Publishers
    In:  Zoosystematics and Evolution vol. 96 no. 2, pp. 431-447
    Details
    Publication Date: 2024-01-12
    Description: By means of an integrated approach, including molecular, morphological, anatomical and histological data, we describe a new species of freshwater flatworm of the genus Dugesia from southwest China, representing the third species recorded for the country. Morphologically, the new species, Dugesia umbonata Song & Wang, sp. nov., is particularly characterised by the presence of a muscularised hump immediately antero-dorsally to a knee-shaped bend in its bursal canal and by an ejaculatory duct that opens subterminally through the dorsal side of the penis papilla. Four molecular datasets (18S rDNA; ITS-1; 28S rDNA; COI) facilitated determination of the phylogenetic position of the new species, which belongs to a clade comprising other species from the Australasian and Oriental regions. We also analysed the structure of its major nervous system by means of the acetylcholinesterase (AChE) histochemical method and compared these results with data available for three other species of Dugesia.
    Keywords: Ecology ; Evolution ; Behavior and Systematics ; Molecular phylogeny ; Taxonomy ; Histochemistry ; Acetylcholinesterase (AChE)
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fracture Analysis and Mechanical Property of AZ91D Magnesium Alloy Chips Prepared by Solid State Recycling (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 499-502 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: AZ91D magnesium alloy is prepared by hot extrusion of recycled machined chips and itsfractures and mechanical properties are investigated at various extrusion conditions. Cold-press isemployed to prepare extrusion billets of AZ91D magnesium alloy chips, and then the billets are hotextruded at 573K-723K with an extrusion ratio of 11:1. The results show that tensile strength andelongation of the extrusion magnesium alloy with the extrusion temperature of 673K and theextrusion rate of 0.08mm/s can reach 380MPa and 6%, respectively. Fracture surface presents a mixmechanism of dimple-like fracture and gliding fracture. Due to grain refinement by cold-press andhot extrusion, mechanical properties of extruded rods are much higher than those of as-cast AZ91Dmagnesium alloy. Also, much lower energy consumption is necessary for this recycling compared tothe conventional casting process. Solid state recycling is an efficient method for magnesium alloychips recycling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.499.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and Cytocompatibility of Novel Nano-HA/PLA Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 369-372 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to prepare nano-hydroxyapatite/poly(lactide) (n-HA/PLA) composite with goodinterfacial interaction, some groups which could bind with Ca ions in HA crystals need to beintroduced onto PLA surface. Poly(α-methacrylic acid) (PMAA) was grafted on the PLA surfacesvia photooxidization and subsequent UV induced polymerization. Suspension of PMAA-PLAmicroparticles with an average size as 133.1nm was prepared with solvent evaporation technique.Then utilizing the action of template manipulating of PMAA-PLA microparticles, n-HA/PLAcomposite were synthesized. Zeta potentials measurement and SEM indicated that there were goodinterfacial interactions between two phases of n-HA/PLA composite. The results of cell viabilityconfirmed that n-HA/PLA composite possessed good cytocompatibility, so the n-HA/PLAcomposite scaffold obtained by electrospun technology might be used as bone tissue engineeringscaffold
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.369.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Biocompatibility of Nano-TiO〈sub〉2〈/sub〉/HA Bioceramic Coating for Nerve Regeneration around Dental Implants (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1393-1396 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sensory perception thresholds of implants were much higher than those of natural teeth.The purpose of this study was to evaluate the biocompatibility of TiO2/HA-biocoated dentalimplants for nerve regeneration using cultured Schwann cells. The nano-TiO2/HA compositebioceramic coating was developed on the surfaces of commercially pure titanium discs by sol-gelroute, and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).Using smooth titanium discs as a control, Schwann cell responses to the coating were evaluated bySEM, MTT assay, total protein content and leakage of cytosolic lactate dehydrogenase (LDH)activity. In addition, the amount of brain-derived neurotrophic factor (BDNF) secreted by Schwanncells was measured by Enzyme-Linked Immunosorbent Assay (ELISA). It was observed that thecoating had fine crystallites and homogeneous micropores in the diameter of 5-10 um. The cellmorphology, proliferation and function were unaffected. The results indicate that the TiO2/HAbioceramic coating developed on the surface of pure titanium by sol-gel route had goodbiocompatibility with Schwann cells for nerve regeneration around dental implants
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1393.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and Properties of Biodegradable ABA Triblock Copolymers of Polylactide (A) and Polyethylene Glycol (B) (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 469-472 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The triblock ABA copolymers of poly (D,L-lactide)-b-poly (ethylene glycol)-b-poly(D,L-lactide) (PDLLA-PEG-PDLLA) were synthesized by bulk ring-opening polymerization in thepresence of N2 under normal pressure, using the D,L-lactide (DLLA) as monomer, hydroxylendgroups of poly(ethylene glycol) (PEG) as initiator and the stannous octoate as the catalyst. Theresulting copolymers were characterized by various analytical techniques. Effects of molar ratios oflactide to PEG and the chain length of PEG on the viscosity-average molecular weight of thecopolymers, the biodegradation behaviors and hydrophilicity of the copolymers were investigated indetail. The results showed that the viscosity-average molecular weight and the contact angle of thecopolymers increased with the molar ratio of lactide to PEG, but water uptake and degradabilitydecreased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.469.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Sensor Characteristics of Carbon Fiber Mat (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1451-1454 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Structural health monitoring (SHM) is becoming a popular topic. Carbon fiber reinforcedconcrete (CFRC) is an intrinsically smart material that can sense strain. The resistivity increasesreversibly under tension and decreases under compression. A new skin-like sensor —cement-basedsmart layer had been put forward, which can serve as whole field strain sensor. The smart layer issatisfactorily consistent with concrete structure. The smart layer is a thin carbon fiber mat cementbasedcomposite material layer with finite electrodes. It can cover the surface of concrete structure,and provide on-line reliable information about the deformation of whole concrete structure. Thestatic characteristics of the new-type sensor had been researched. Its gage factor is 20-25 undertension and 25-30 under compression within the elastic deformation range. Furthermore the smartlayer has satisfactory linearity and repeatability. In this paper, the sensor characteristics of the barecarbon fiber mat have been reached. The resistivity of carbon fiber mat has good agreement withstrain under uniaxial tension. The gage factor can be up to 375, and the sensor limit can be up to10000 microstrain. The strain and the fractional change in electrical resistance .R/R0 are totallyreversible and reproducible under cyclic loading and amplitude-variable cyclic tensile loading
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1451.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Nano Hydroxyapatite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 235-238 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of this study is to prepare nano hydroxyapatite powder. Hydroxyapatite powderwas prepared via co-precipitated method with the addition of citric acid at pH 9-11 in ambientenvironment. The precipitates were aged for 24hs, and then milled into powder after washed anddried. The particle morphology and particle size of as prepared HA powders were characterized.The results showed that hydroxyapatite powder with width of 10-30nm and length of 30-100nm wasprepared by wet co-precipitation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.235.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluation of Sodium Titanate Coating on Titanium by Sol-Gel Method In Vitro (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 777-780 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, an exclusive sodium titanate (Na2Ti6O13) coating on titanium was fabricatedby sol-gel method and evaluated in vitro. The coating was characterized by SEM and XRD. Thebioactivity of the Na2Ti6O13 coating was evaluated by the biomimetic growth of apatite on its surfaceafter soaked in an acellular simulated body fluid (SBF) for a period of time. In vitro osteoblastsculture was carried out to determine cytocompatibility by the measurement of the proliferation andalkaline phosphatase (ALP) activity of the cells. XRD patterns showed that Na2Ti6O13 was wellcrystallized when the coating was heated at 800℃. SEM observation exhibited that the Na2Ti6O13coated titanium had a homogeneous surface without any cracks. After immersion in SBF, the apatitelayer can be formed on the coating. The cells culture showed that the osteoblasts grew well on theNa2Ti6O13 coated titanium. It can be concluded that Na2Ti6O13 coating on titanium obtained bysol-gel method is bioactive
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.777.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Development and Characterization of Nano-TiO〈sub〉2〈/sub〉/HA Composite Bioceramic Coating on Titanium Surface (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1802-1805 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This research is aimed at the development and characterization of a novel bioceramic coatingon the surface of pure titanium. Nano-TiO2/HA composite bioceramic coating was designed anddeveloped on the surfaces of pure titanium discs by sol-gel route. The TiO2 anatase bioceramic coatingwas employed as the inner layer, which could adhere tightly to the titanium substrate. The porous HAbioceramic coating was employed as the outer layer, which has higher solubility and better short termbioactivity. Conventional HA coatings and commercially pure titanium (cpTi) were taken as control.XRD and SEM were employed to characterize the crystallization, surface morphology and thickness ofthe coatings. The bioactivities of the coatings were evaluated by the in vitro osteoblasts culture. Resultsshow the nano-TiO2/HA composite bioceramic coating has good crystallization and homogeneous,nano-scale surface morphology. And it adheres tightly to the substrate. The in vitro osteoblasts cultureexhibits satisfactory bioactivity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1802.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Solvent on Porous PLA/HA Scaffolds Preparation Using Novel Solid H〈sub〉2〈/sub〉O〈sub〉2〈/sub〉 Porogen (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 49-52 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hydroxyapatite/polymer scaffolds with proper biomechanical properties and stable 3-Dporous structure were fabricated by combining gas foaming with solvent-casting/particle-leachingtechnique, in which novel solid H2O2 were used as a porogen. During the manufacturing process,we found that the porosity, compressive strength and microstructure of the composites are variedfrom each other while different solvents (dichloromethane, acetone, chloroform and 1,4-dioxane)were used. Porosities of the specimens increase from 72±5 to 87±5% in accordance with theincrease of boiling point from 39.75 to 101.32 °C, while compressive strength decreased (4.8±0.7-0.5±0.3 MPa). Interactions of HA/solvent and PLA/solvent together with evaporation dynamic testsof different solvents were investigated. The results show that the evaporation rate of the solvents isthe most important factor affecting the final properties of the scaffolds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.49.pdf
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