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Objective: To investigate the expression of mi R-195 and mi R-3653 in glioma tissue and to analyze their relationship with clinicopathological features and prognosis of glioma. Methods: Collected paraffin specimens of 42 glioma patients who underwent surgical resection at The Seventh Affiliated Hospital of Guangxi Medical University from January 2016 to June 2019 as the glioma group, and another 30 patients with traumatic brain injury who underwent surgical treatment during the same period were selected, and the paraffin specimens of the frontal or temporal lobe tissue removed during surgery were used as the control group. The relative expression of mi R-195 and mi R-3653 in glioma group and control group were detected by real-time fluorescent quantitative polymerization chain reaction (qRT-PCR), and the relationship between the expression of mi R-195 and mi R-3653 and the clinicopathological characteristics of glioma were analyzed. The relationship between mi R-195, mi R-3653 expression and prognosis in glioma patients was analysised by Kaplan Meier survival curve. The factors affecting the prognosis of glioma patients were analysised by Multivariate Cox regression. Results: The expression level of mi R-195 and mi R-3653 in glioma group were lower than those in control group (P＜0.001). There were significant differences in mi R-195 expression among patients with different pathological grades and distant metastasis (P ＜0.001). There were significant differences in mi R-3653 expression among patients with different tumor diameter,pathological grade and distant metastasis (P＜0.001). Kaplan-Meier survival curve showed that the three years survival rate of mi R-195and mi R-3653 low expression group were lower than those of mi R-195 and mi R-3653 high expression group (P＜0.05). Multivariate Cox regression analysis showed that distant metastasis, pathological grade III-IV level, low mi R-195 expression, and low mi R-3653expression were risk factors for the prognosis of glioma patients (P＜0.05). Conclusion: The low expression of mi R-195 and mi R-3653 in glioma patients is associated with distant metastasis, pathological grading of grade III-IV level, and low survival rate, mi R-195 and mi R-3653 may become prognostic indicators and therapeutic targets for glioma. [ABSTRACT FROM AUTHOR]

Monodisperse carbon nanospheres (CNs-APAM) with different APAM incorporation amounts were prepared by an assisted hydrothermal method using glucose, anionic polyacrylamide (APAM) as raw material. The samples were characterized and tested using SEM, FTTR, XRD, TG, and ultraviolet-visible spectrophotometer (UV-vis). The effects of APAM addition on the dispersion and yield of carbon nano spheres (CNs) and the adsorption performance of CNs on methylene blue (MB) with different APAM additions were investigated. Tt was shown that the best dispersion and highest yield of CNs were achieved at the addition of APAM at 1 20 mg, with the yield up to 21.5 %• The adsorption results showed that CNs-APAM had the best adsorption effect on MB with the maximum adsorption amount of 124.26 mg • g-1 when the addition amount of APAM was 1 20 mg, the adsorption time was about 2 h, the concentration of MB solution was 30 mg/L, and the initial pH of the solution was 100. The fitting results of the adsorption model showed that the process of MB adsorption by CNs-APAM was consistent with Langmuir model with quasi-secondary kinetic model. [ABSTRACT FROM AUTHOR]

The effects of low degree inulin LPI（DP≤10）,medium degree inulin MPI（DP 2-60） and high degree inulin HPI（DP≥23） on the powder properties, granular strength and cooking quality of tapioca pearls were studied. The results showed that inulin could interact with starch in hydrogen bond, compete with starch for water, inhibit the swelling of starch particles and improve the water solubility of the powder, thus affecting the granular strength and cooking quality of tapioca pearls. LPI has the stronger hydrogen bond interaction with starch and forms a stronger gel network structure, so it is best to add LPI. Adding 3%（w/w） LPI significantly reduced friction loss（1. 96%-1. 04%） and cooking loss（47. 8%-43. 6%） of tapioca pearls. It also significantly improved the transparency（9. 4%-12. 6%）,volume expansion（4. 9-7. 0）,hardness（483 to 674 g）,and chewiness（202 to 299 g）. The addition of MPI and HPI had adverse effects on the transparency, breaking force or cooking loss of tapioca pearls. This study shows that the addition of inulin is an effective green means to improve the quality of tapioca pearls, and the addition of low polymerization inulin is better. [ABSTRACT FROM AUTHOR]

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on the chemical fingerprint development method, this science popularization project has designed a variety of different science experiments to show the principle and characteristics of chemical fingerprint development to the science popularization target comprehensively. In the mode of science popularization, the project innovatively combines “online + offline” mode and “home + laboratory” environment, which breaks the limitation of time, space and equipment in traditional science popularization and greatly expands the scope and breadth of science popularization. In addition, in the implementation of specific science popularization, the project focuses on the improvement of scientific and cultural literacy of science popularization targets, opening up the public’s vision, and achieving scientific and effective disinformation. [ABSTRACT FROM AUTHOR]

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Silicone Material is the property of Silicone Material Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The first technical obstacle encountered in the process of negative photoresist industrialization is that the lithographic pattern of the photoresist formula and lithography process optimized in the laboratory cannot be reproduced on the industrial production line. The reason for this could be the difference in exposure modes. A laboratory-prepared negativetone photosensitive polyimide (n-PSPI) is used to prepare two polyimide photoresists with different photo-initiators. They were exposed under the same exposure energy in stepwise mode (high power, short time) and contact mode (low power, long time), respectively, being followed by solvent development for photolithography. Based on the resultant patterns, ideal lithography patterns can be obtained by stepper exposure with fast rate initiators or contact exposure with slow rate initiators. On the contrary, stepper exposure combined with slow rate initiators is prone to unclean development caused by free radical diffusion, while contact exposure combined with fast rate initiators results in low film retention rate caused by insufficient crosslinking. These undesirable graphics effects can not be improved by shortening or extending the exposure time. Therefore, the rational use of initiators is crucial for the formulation design of photoresists with different exposure modes. Combined with the theory of free radical formation and diffusion kinetics, the lithography pattern rule of n-PSPI photoresist under different exposure modes is explained. These conclusions can provide a theoretical guidance for formula modification when converting laboratory products to industrial applications. [ABSTRACT FROM AUTHOR]

Copyright of Silicone Material is the property of Silicone Material Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, glass fiber reinforced polyamide 6 (PA6/GF) composites were prepared through anionic polymerization of caprolactam and vacuum-bag press molding (VBPM). The effects of parameters such as curing temperature and impregnation method on the monomer conversion, crystallinity, and mechanical properties of the composites were investigated using continuous fiber-reinforced polyamide 6 reactive injection as a self-built VBPM experimental platform. The results indicated that the composites fabricated by isothermal impregnation had a high degree crystallinity and good internal homogeneity. Compared to the isothermal impregnation, the non-isothermal impregnation promoted higher overall reaction conversion and better mechanical performance for the fabricated composites. Through the non-isothermal impregnation, the composites obtained at the outlet achieved an increase in bending and shear strength by 10%~13% and 11%~16% than that at the inlet, respectively. The bending strength of the composites obtained at the outlet reached a maximum value of 273.65 MPa at 150 °C, and their maximum shear strength reached 47.32 MPa at 170 °C. [ABSTRACT FROM AUTHOR]

By studying the effects of different initiator systems on the synthesis conversion, dispersion performance and retention properties of different types of PCE by orthogonal experiment, the initiator system suitable for the synthesis of PCE from different polyether monomers was optimized. The results showed that TPEG/HPEG/EPEG type PCE synthesized with H2O2-E51-NaH2PO2 as initiator had better dispersion performance, and HPEG/EPEG type PCE synthesized with H2O2-E51-ME as initiator had better dispersion retention. PCE synthesized by different initiator systems has no effect on concrete strength. PCE synthesized by E51 as reducing agent has better workability, and the type of chain transfer agent has obvious effect on the dispersibility and workability of synthesized PCE. [ABSTRACT FROM AUTHOR]

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Silicone Material is the property of Silicone Material Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Based on waste poplar sawdust (YWC) and bentonite (BT), acrylic acid (AA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) were used as monomers. Potassium sulfate (KPS) was used as initiator and N-N methylenebisacrylamide (MBA) was used as cross-linking agent. The poplar-bentonite environment-friendly composite was prepared by solution polymerization method. The effect of monomer ratio, neutralization degree, initiator dosage, crosslinking agent dosage, bentonite dosage and other factors on the performance of the resin was investigated, and a comparison was obtained. The optimal monomer ratio is m(YWC) : m(AA) : m(AMPS) : m(KPS) : m(MBA) : m(BT)=2.0.5.0.0.4.0.0.04.0.012.012. When the degree of neutralization is 65%, the obtained water absorption ratio is 539.5 g·g.-1, the suction rate of normal saline is 45.3 g·g -1 super absorbent resin. Using infrared Spectroscopy, scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis were used to characterize the resin, and to evaluate the pH sensitivity, swelling kinetics, and recyclability of the resin. The results show that the swelling process of the resin conforms to the second-order kinetic model, and has the characteristics of high mechanical strength and excellent cycle performance. [ABSTRACT FROM AUTHOR]

As a substitute of suture, bioadhesive attracts much attention in clinical application. However, the development of bioadhesive with excellent bonding performance for underwater usage remains a challenge. Herein, a non-aqueous bioadhesive with underwater bonding properties was manufactured based on hydrophobic hyperbranched polythioether (HBP). HBP with the surface containing abundant thiol groups was synthesized through a simple thiol-(meth)acrylate Michael addition polymerization of 2-(acryloyloxy)ethyl methacrylate (AA' monomer) and trimethylolpropane tris(3- mercaptopropionate) (B3 monomer). HBP was a liquid material under room temperature, thus enabling the manufacturing of non-aqueous adhesives (HBP-x) by the direct addition of poly(ethylene glycol) diacrylate. The properties of HBP-x were studied using vial-tilt method, rheological test, lap-shear adhesion test, swelling test, degradation test and in vitro cytotoxicity test. Results showed that the HBP-adhesive could bond porcine skin with an underwater adhesive strength of up to 43 kPa. Moreover, the HBP-adhesive minimally swelled (7.2%—17.3%) and was degradable. In vitro cell experiments showed that the HBP-adhesive showed very low cytotoxicity to L929 cells, and allowed the proliferation of L929 cells on the surface of the adhesive. This non-aqueous HBP-adhesive based on thiol-acrylate Michael addition reaction displayed an underwater bonding ability and excellent cytocompatibility, holding great potential for clinical applications. [ABSTRACT FROM AUTHOR]

polymethyl methacrylate-polymethyl methacrylate-miethacrylic acidc acid/silica (Poly ( MMA/MAA)/SiO2, that is, PMMS), carboxymethyl chitosan (CMCS), acrylamide (AAm) were used as raw materials, EDC/NHS as catalysis, the CMCS-PMMS/PAAm composite hydrogel was prepared by pH adjustment, free radical polymerization. The rheological properties, mechanical properties, swelling properties, electrical conductivity and biocompatibility of the hydrogels were studied. The results showed that the pH value had a great influence on the rheological properties of the composite hydrogel. The storage modulus (G') decreased first and then increased. When the pH value was 6, the G' maximum was 9200 Pa; Hydrogels with low pH were stiff, and the ones with high pH were soft and tough. When the pH value was 9 or 10, the composite hydrogel could maintain a good shape under a large compressive strain. It had good tensile properties and cyclic compressibility. The composite hydrogel also had good swelling properties, and even after water absorption reached the swelling equilibrium, it could still maintain the deformation recovery ability (the equilibrium swelling rate in pure water could reach 860%). In addition, the hydrogel had good conductivity, the highest conductivity could reach 2.98 x 10-4 S/cm; and it had good anti-hemolysis performance and cell compatibility. The hemolysis rate of all composite hydrogel samples was less than 5%, and the cytoactive was more than 75 %. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Using nature polymer gelatin and methacrylic acid (MAA) as raw materials, and ammonium persul-fate (APS) as an initiator, a gelatin/polymethacrylic acid (gelatin/PMAA) composite hydrogel was synthesized via free radical polymerization. The effects of different component mass ratios on the conductive properties, rheological properties and mechanical properties of the composite hydrogel were studied. The results showed that the conductivity of the composite hydrogels adjusted to 6.52 x 10-3 S/cm with the dosage of MAA increasing. The conductivity also varied with the deformation of the hydrogel, making gelatin/PMAA composite hydrogel in terms of strain sensor have great potential applications. When the gelatin/PMAA composite hydrogel contained gelatin of 12% and MAA of 10%, named G12PA10, it exhibited optimal rheological properties and mechanical properties: storage modulus G' was up to 18.0 kPa, elongation at break was 340%, and compression modulus was 2.37 MPa. As the dosage of MAA increased, the swelling equilibrium time and swelling equilibrium rate of the gelatin/PMAA composite hydrogel in deionized water were basically the same as those in PBS buffer. But when the dosage of MAA was lower, the swelling equilibrium rate of gelatin/PMAA composite hydrogel in PBS solution increased slightly. [ABSTRACT FROM AUTHOR]

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A kind of hyperbranched azopolymers (HPAzoAMAM) with different structures and molecular weights were successfully synthesized via Michael addition polymerization between A2 and B2B' monomers. All the structures of HPAzoAMAM and their corresponding molecular weights were analyzed. HPAzoAMAM can self-assemble into aggregates with different morphologies and sizes in aqueous solution confirmed by SEM, TEM and DLS. The photo-isomerization of HPAzoAMAM in DMF and micelle solution were both studied through UV-Vis spectrophotometer. The final results showed that the structure of HPAzoAMAM could be modulated by controlling the molar ratio of the initial 2 and B2B' monomers. HPAzoAMAM could self-assemble into large spherical compound micelles (LCMs) with various sizes in aqueous solution because of their different hydrophilicities and molecular weights. With the increasing of the hydrophobicity and molecular weight of HPAzoAMAM, the size of LCMs turned to be larger. The reversible transcis isomerization behavior of HPAzoAMAM in DMF and micelle aqueous solution were studied by UV-Vis irradiation. The results showed that all the absorption peaks of HPAzoAMAM in DMF were at the same positon of 377 nm, while those of the micelle aqueous solutions of HPAzoAMAM-1, HPAzoAMAM-2, HPAzoAMAM-3 were at 376, 367 nm and 372 nm, respectively. Therefore, HPAzoAMAM aggregates were in different π-π stacking styles. Furthermore, in the case of HPAzoAMAM micelle isomerization, the time for reaching stationary state was much longer than that in DMF solution, which was attributed to the highly regular arrangement of azobenzene moieties in aggregates and the restriction of the hyperbranched structures. The feasible combination of azobenzene and hyperbranched polymer provides a promising guidance for the application research of azopolymers. [ABSTRACT FROM AUTHOR]

Hyperbranched poly(amino-ester)s with the surface containing acrylate bonds, backbone containing poly(ethylene glycol) (PEG), and interior containing tertiary amines have been synthesized via an one-step route associated with the Michael addition polymerization of trifunctional amine, 1-amino-2-(ethylamino)ethane (B'B2-type monomer), and a double molar diacrylate, poly(ethylene glycol) diacrylate (A2-type monomer). The hyperbranched poly(amino-ester) was modified with imidazole by Michael addition reaction of acrylate in hyperbranched poly(amino-ester)s and amine in imidazole. The polymerization kinetics of hyperbranched poly(amino-ester) was studied by 1H-NMR. The chemical structures of these hyperbranched polymers were confirmed by 1H-NMR, GPC and FT-IR. Results showed that the molecular weight of the hyperbranched poly(amino-ester) modified with imidazole was 1.42×103, and the polydispersity index(PDI) was 1.05. The water solubility and pH responsiveness of the hyperbranched polymers were investigated by Zeta potential analyzer. Results demonstrated that the hyperbranched polymers showed excellent water solubility due to the presence of PEG backbone. Additionally, the hyperbranched poly(amino-ester) modified with imidazole has numerous tertiary amines which make the polymer carry more charges than the hyperbranched poly(amino-ester), therefore offering it with more sensitive pH responsiveness. [ABSTRACT FROM AUTHOR]

Hyperbranched polyether HBPO-star-PEO (HSP, HBPO: hyperbranched poly(3-ethl-3-oxetanemthanol; PEO: polyethyleneglycol)) with different PEO arm lengths were synthesized by cationic ring-opening polymerization. A series of ultrasound contrast agents (UCA) were prepared using HSP as shell materials and SF6 as inner gas, which were named as HSP-UCA. The size, micromorphology, SF6 concentration and in vitro/in vivo ultrasound imaging effect of HSP-UCA were characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM), gas chromatography-mass spectrometry (GC-MS), and ultrasound imaging instrument. The results showed that analogous to the effect of PEO arm length on the stability of the vesicles, the stability of UCA increased with the PEO arm length, resulting in an increase in its concentration. When the PEO arm length was increased to 10, high concentration of HSP10-UCA was obtained with an average size of 517.3 nm, the SF6 volume fraction of 9.12 ×10−3 and the in vitro ultrasound half-life of 3−5 min. in vivo Ultrasound test of HSP10-UCA in rabbit heart showed good ultrasound contrast effect. Before the injection of nano-scale HSP10-UCA, the ultrasound echo signal inside the heart was very low and the internal structure could not be observed by ultrasound imaging. However after intravenous injection of HSP10-UCA, the rabbit heart was quickly perfused, its internal structure was slowly appeared. The average ultrasound contrast duration of HSP10-UCA was 50−60 s. The above results indicate that the nano-scale HSP10-UCA is an excellent ultrasound contrast agent and its good ultrasound contrast effect will be beneficial to its future applications in the ultrasound imaging of tumor tissues. [ABSTRACT FROM AUTHOR]

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Hyperbranched polyglycerol (hPG) with controlled molecular weight and narrow polydispersity has been synthesized by one-step anionic ring-opening polymerization (ROP) reaction, in which monomer glycidol (2,3-epoxy-1- propanol) was added dropwise to the mixture solution of timethylolpropane (TMP) initiator, potassium tert-butoxide (K-t- OBu) base, and anhydrous N-methylpyrrolidone solvent, for the prevention of cyclized byproduct. hPGs with three different molecular weights were synthesized through tailoring the molar ratio of initiator to monomer. Various techniques including 1H-NMR, inverse gated (IG) NMR spectroscopy, gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FT-IR), were employed to characterize the chemical structure, degree of branching (DB), molecular weight and polydispersity of the synthesized hPG. Differential scanning calorimetry (DSC), thermogravimetric (TG), analyzer particle size and Zeta analyzer were used to analyze their glass transition temperature (Tg), thermal stability and solution properties, respectively. Results demonstrate that three hPGs were synthesized with targeted molecular mass (1.5×103, 4.6×103, 11.2×103) and polydispersities in the range of 1.82 -2.05. Importantly, the solvent N-methylpyrrolidone could rapidly increase the molecular weight of hPG during the reaction and improve its mono-dispersity compared to the non-solvent system. Moreover, the glass transition temperature (Tg) and thermal degradation temperature (Td) of hPG were increased slightly with the increasing molecular weight from 1.5×103 to 11.2×103. [ABSTRACT FROM AUTHOR]

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The control of locked and unlocked states in chain-growth polymerization has wonderful potential for the precisely synthetic polymers with specific structures or functions.Because a large number of living centers exist during chain propagation,if all or portion of them can be controllably switched between the locked and unlocked states,the chain propagation can either insert specific monomer units or block structures at specific sites.Ma’s group at Dalian University of Technology reported an intriguing advance in living anionic polymerization（LAP）by a "locked-unlocked"mechanism in which the living anionic species can be quantitatively locked by end-capping with 1-（tri-isopropoxymethylsilylphenyl）-1-phenylethylene（DPE-Si（O-iPr）33）and can be unlocked by adding the key,sodium 2,3-dimethylpentan-3-olate（NaODP）.This intriguing mechanistic finding of LAP reactions is expected to supplement the existing knowledge and facilitate the tailoring of specific structures for these polymerizations. [ABSTRACT FROM AUTHOR]

Polymerization using the characteristic features of flow microreactor systems such as fast mixing, fast heat transfer, and short residence time has attracted a great deal of attention, and extensive studies have been reported. Herein we report that the cationic polymerization of vinyl monomers can be achieved in a flow microreactor system with excellent molecular-weight distribution control without adding a capping agent, which decelerates the propagation due to the equilibrium between active and dormant species. We also report that flow microreactor systems are effective for accomplishing the controlled anionic polymerization of styrenes or alkyl methacrylates. A high level of control of the molecular weight distribution can be achieved in a flow microreactor under easily accessible conditions such as 24 to -28°C. Moreover, the efficient synthesis of well-defined polymers was successfully achieved using an integrated flow microreactor system. Diblock copolymers, triblock copolymers, and block copolymers having two different polymer chains on a silicon core were obtained with narrow molecular weight distributions. [ABSTRACT FROM AUTHOR]

In order to investigate the performance of shearwalls connected with domestic nails in light wood frame structures, lateral resistance tests were conducted on 14 shearwalls in 7 groups with different dimensions and structural arrangements. Using ABAQUS, FE models of shearwalls were developed to simulate the structural behaviour. Both the experimental and numerical results show that failure of nail connections is the primary cause leading to the failure of shearwalls. The load-carrying capacity and the stiffness of shearwalls are proportional to the width. The performance of shearwalls with an opening, in terms of load-carrying capacity and stiffness, is higher than that of shearwalls without an opening but with the width equaling to the sum of the wall segments from the two sides of the opening. Gypsum panels improve the performance of shearwalls significantly. The empirical equations to predict the lateral resistance and stiffness of shearwalls were derived based on the test and FE modelling. [ABSTRACT FROM AUTHOR]