Silk Nanofibril-Palygorskite Composite Membranes for Efficient Removal of Anionic Dyes.

To develop membrane materials with good performance for water purification that are green and low cost, this work reports an organic-inorganic composite membrane composed of silk nanofibrils (SNFs) and palygorskite (PGS). To improve the stability of the the composite membrane, genipin was used as a crosslinking agent to induce the conformational transition of SNF chains from random coils to β-sheets, reducing the swelling and hydrolysis of the membrane. The separation performance can be adjusted by tailoring the component ratio of the nanomaterial.

Cordycepin induces apoptosis in human pancreatic cancer cells via the mitochondrial-mediated intrinsic pathway and suppresses tumor growth in vivo.

Background: Cordycepin, the main active ingredient of a traditional Chinese herbal remedy - extracted from - has been demonstrated as a very effective anti-inflammatory and antitumor drug. The present study investigated its antitumor effect on pancreatic cancer, a highly aggressive cancer with extremely poor prognosis due to malignancy, and clarified its underlying mechanism both in vitro and in vivo.

Methods: The antitumor viability of cordycepin on human pancreatic cancer MIAPaCa-2 and Capan-1 cells was determined by colony formation assays.

The research on screening differentially expressed genes in Hirschsprung's disease by using Microarray.

Objective: To study the differential expression of genes between Hirschsprung's disease (HSCR) and normal tissue by using microarray for exploring the mechanism of HSCR development and establishing the gene expression profiles of HSCR.

Methods: Colon tissues (aganglionic and normal segments) of 4 patients with HSCR were detected by the Agilent SurePrint G3 Human GE 8x60K Microarrays. RT-PCR was used to verify the results of Microarray test.

Congenital choledochal cysts in adults: twenty-five-year experience.

Background: Choledochal cyst is rare in western countries. The relatively high incidence of coexistent hepatobiliary disease increases the difficulty of the surgical management of choledochal cyst. Here we analyze the diagnosis and treatment of congenital bile duct cyst in 122 Chinese adults.

[Comparison of wound healing after pancreaticojejunostomy with three anastomotic methods in piglets].

Objective: To evaluate wound healing after pancreaticojejunostomy of three anastomotic methods.

Methods: Fifty-four domestic piglets were divided into three groups according to the types of anastomoses: group of end-to-end pancreaticojejunal invagination (EE group), group of binding pancreaticojejunostomy (BP group) and group of inkwell pancreaticojejunostomy (IP group). Bursting pressure, breaking strength and histopathological findings of anastomosis were assessed on operative day and on the 5th and 10th day after operation.

[Research on the modification of Kevlar fiber by polypropylene glycol and cis-2-butene-1,4-diol].

The mechanism of the modification of Kevlar fiber by polypropylene glycol(PPG) and cis-2-butene-1, 4-diol was studied in the paper, the authors learned the esterification of toluene-2, 4-diisocyanate (TDI) onto Kevlar fiber by infrared spectrum. In the mean time, the infrared spectrograms of the productions which steadily disposed by PPG and butendiol were analysed respectively, the result showed that the intensity of the bands was reinforced at about 1700-1720 cm(-1) after the samples were steadily disposed, that is to say, the group of --NCO has been stabilized into --NHCO group, the effect of steady disposal was obvious; but the disposal effect of butendiol was apparently better than PPG's at the same condition. Finally, the authors compared the influence of different mol rates between TDI and butendiol on the productions.

[Preparation and properties of organobentonites].

The chemistry organobentonites were synthesized by means of the ionexchange reaction between single-octadecyl trimethyl ammonium chloride(SOAC), di-octadecyl dimethyl ammonium chloride (DOAC) , tri-octadecyl methylammonium chloride (TOAC) quaternary ammonium salts and sodium base bentonies, respectively. The authors used FTIR, X-ray diffraction diagram and DSC thermograms to characterate the structure of the modified bentonites, and discussed the effect of different quaternary ammonium salt on the properties of organobentonites. The results showed that ion of the surfactants had entered into the chip layer of the bentonites, and changed the hydrophilic environment of the chip layer into hydrophobic environment and increased the distance among the chip layer, all of these had laid a base for the preparation of the nanometer composite material of high polymer/bentonite.

[Structural characterization of rare-earth stearate and its thermal stability mechanism for PVC].

Structural characterization of rare-earth stearate was conducted by FTIR and XRD. The results show that the bonds between the stearate and rare-earth metal ions in rare-earth stearate are main ionic character and have the stratified crystalline structure with the crystal layer formed from a plane layer of rare-earth ions combined with two layers of fully extended zigzag chains of stearic acid radicals arranged parallell to each other on its both sides, and the rare-earth ions axes are inclined to the crystal layer planes in it. Congo red test showed that the stabilizing time increased when the stabilizers' concentration increased.

[The research on the surfacial modification of organic high-performance Kevlar fiber].

In the paper the authors tried to use chemical disposal to bring the activity mass onto the surface of Kevlar fiber with the purpose of surface graft modification. In the paper the authors used the FTIR spectra to discuss the graft of toluene-2, 4-diisocyanate onto Kevlar fiber. The authors studied and analysed the effect of hydrolytic time on the content of -O-H group of the production, and the effect of hydrolyzation and hexyl-lactam steadily disposing on the graft reaction.