Objective:To develop a method for the simultaneous determination of vinyl chloride and vinylidenechloride in drug packaging materials containing polyvinyl chloride /polyvinylidene chloride by HS-GC.Methods: A Stabilwax (30.0 m ×0.25 mm, 0.25 μm) capillary column and an FID detector were adopted .The headspace equivalent temperature was 80℃for 30 min and the col-umn temperature was 40℃.The inlet temperature was 190℃and the detector temperature was 210℃.N2 was used as the carrier gas . The flow rate was 1.0 ml · min-1 .Results: Vinyl chloride had a good linear relationship within the range of 0.5-2.5 μg ( r =0.996 7), and the average recovery was 90.4%(RSD=0.9%, n=9).Vinylidenechloride had a good linear relationship within the range of 1.0-5.0 μg (r=0.999 0), and the average recovery was 90.0%(RSD=0.6%, n=9).Conclusion: The method is fast and accurate in the simultaneous determination of vinyl chloride and vinylidenechloride in drug packaging materials containing polyvinyl chloride/polyvinylidene chloride .

Objective To investigate the distribution of interstitial Cajal-like cells(ICLC) in ampulla and the myoelectric activities of the sphincter of Oddi(SO) of adult guinea-pigs.Methods C-Kit immunohistochemical staining was carried out on whole-mount preparations of guinea-pigs' ampulla region.The myoelectric activities of SO were recorded by using the contact electrode on mucosa.Result C-Kit-positive ICLC were observed in both exterior and inner wall of ampulla.Some of these cells were distributed in the circular and longitudinal smooth muscle cell(SMC) layers assuming a spindle-like shape.Another sub-group of ICLC,which were located between the longitudinal and circular SMC layers,were shown to have oval or triangle cell bodies with projection of more than three long processes.These cells interlaced into a cellular network,closely resembling the interstitial cells of Cajal(ICCs),around the myenteric nervous plexus(ICC-MY) in the duodenum.At the inner side of circular SMC layer of the exterior wall,ICLC were similar to ICCs associated with the deep muscular plexus(ICC-DMP) of small intestine.In the inner wall of the ampulla,a large amount of ICLC were found in the SMC layers or bundles,running parallel with them.At the opening of the ampulla,a number of ICLC surrounded the opening to form a ring.The spontaneous rhythmic myoelectric activities could be recorded in the SO.Conclusion It is suggested that the ICLC might contribute to the regulation of the spontaneous rhythmic contraction,and it might be related to development of motility disorders of the SO.

Objective To understand the relationship between embryonic chromosomal abnormalities and missed abortion by high-throughput gene sequencing, so as to provide a basis for guiding the next pregnancy.Meth-ods By chromosome detection on villi chromosome of 52 cases of missed abortion by high-throughput gene sequen-cing technique, the types of chromosome abnormalities and the proportion were investigated.Results Among villi samples from the 52 cases of missed abortion, chromosomal abnormalities were founded in 28 cases, including 24 ca-ses of number abnormality (17 cases of trisomy, 6 cases of triploid and a case of monomer) and 4 cases of structural abnormalities.Conclusion Embryonic chromosomal abnormality is the main cause of missed abortion in early preg-nancy.High-throughput gene sequencing technology used to detect the villi chromosome is comprehensive, fast and accurate, helping to clarify the cause of missed abortion and guide the next pregnancy reasonably.

Object To develop the gene resources of Jilin Shuangyang sika deer,a rare animal in China and reveal the pharmacological functions of deer medicinal material on the molecular level. Methods A cDNA plasmid library of spleen cells derived from Shuangyang sika deer was set up. Some housekeeping genes were cloned and analyzed. Results One of the cDNA sequences and it's deduced amino acid sequence in deer share high homology with a group of cDNA sequences encoding ribosomal protein L27 in human,rat,Canis and mouse and their corresponding amino acid sequence respectively. It has the completed open reading frame as well. Conclusion A novel full-length cDNA encoding Shuangyang sika deer ribosomal protein L27 is discovered. This sequence has been deposited in Genbank under accession number AF373231.

Objective To study the influence of unilateral and bilateral amplification on the effect of hearing aid evaluation .Methods Using the subjective method that International Outcome Inventory for Hearing Aids (IOI-HA) and objective method that medium acoustic intensity (65 dB SPL) word recognition score(WRS) to evaluate the effect of unilateral and bilateral hearing aid fitting of middle -aged severe sensorneural hearing loss .Results Hearing aid were used for severe sensorneural hearing loss and the improvement of monosyllables and sentences in quiet and noise test of unilateral were 35 .73% ,43 .15% ,43 .23% ;the improvement of monosyllables and sentences in quiet and noise test of bilateral were 37 .90% ,51 .33% ,54 .86% .The WRS of bilateral was higher than unilater-al .The score of IOI-HA was 15~37 ,meaning patients with severe sensorneural hearing loss were satisfied with hearing aid ,and there was no statistical significance between unilateral and bilateral fitting .Conclusion The bilat-eral hearing aid fitting was better than unilateral .Binaural hearing loss are recommended to fit bilaleral hearing aids .

Many diseases are associated with vitamin D deficiency.Serum 25 (OH)D levels can serve as objective indicators of the nutritional status of vitamin D.Liquid chromatography-mass spectrometry (LC-MS) method may be applied for routine measurement of 25 ( OH ) D levels in clinical practice.This article reviewed the significance of detecting 25 (OH) D2 and 25 (OH) D3,compared the advantages and disadvantages of different 25 (OH) D measurement methods,and introduced the application of LC-MS method for routine detection of serum 25 (OH) D2 and 25 (OH) D3 levels following the standard by National Institute of Standards and Technology of America.

Objective To observe the effect of duration of carbon dioxide pneumoperitoneum on coagulation, fibrinolysis and endothelial activation in elderly patients undergoing laparoscopic cholecystectomy (LC). Methods The 45 elderly patients with cholelithiasis scheduled for LC, aged over 60 yeas, were placed in different groups respectively after surgery according to the duration of pneumoperitoneum. The duration of pneumoperitoneum was ≤60 minutes in group A (n=21),and more than 60 minutes in group B (n=24). Venous blood samples were taken on admission (baseline), at the end of surgery, the 1st, 2nd and 3rd day after surgery for determination of prothrombin time (PT), activated partial thromboplastin time (APTT), prothrombin fragment F1+2 (F1+2), antithrombin 3 (AT-Ⅲ activity), fibrinogen (Fib), tissue plasminogen activator (t-PA), plasminogen activator inhibitor type-1 (PAI-1), D-dimer (D-D), von Willebrand factor (vWF activity). Results Concerning the coagulation activation, at the 3rd postoperative day, the level of F1+2 was significantly higher in group B than in group A [(1.60±0.26) μg/L vs. (1.32±0.24) μg/L, P＜0.05]; AT-III was significantly higher in group B than in group A [(84.82%±20.21%) vs. (97.49%±16.87%), P＜0.05]. At the 2nd and 3rd postoperative day, the levels of Fib were significantly higher in group B than in group A [(3.87±0.62) g/L vs. (3.42±0.72) g/L, (3.98±0.77) g/L vs. (3.42±0.63) g/L, respectively, P＜0.05]. Concerning fibrinolysis, But at the 2nd and 3rd postoperative day, the level of PAI-1 was significantly higher in group B than in group A [(33.93±10.42) μg/L vs. (26.69±9.49) μg/L, (32.90±11.25) μg/L vs. (26.31±7.06) μg/L respectively, P＜0.05]. Concerning endothelial activation, at the 2nd and 3rd postoperative day, vWF was significantly higher in group B than in group A [(174.53%±44.03%) vs. (134.37%±37.74%), (176.31%±47.6%) vs. (131.21%±36.34%), respectively, P＜0.05]. Conclusions Marked activations of coagulation-fibrinolysis and endothelial activation are observed postoperatively in elderly patients undergoing laparoscopic cholecystectomy. Along with prolonged duration of pneumoperitoneum, more pronounced alterations of increased coagulation, reduced fibrinolysis and endothelial activation are observed, which could constitute an imbalanced situation of coagulation-fibrinolysis and increases the risk of venous thrombosis.

Objective To compare the changes in blood coagulation, fibrinolysis and endothelial damage in patients undergoing laparoscopic cholecystectomy with different durations of carbon dioxide pneumoperitoneum. Methods Sixty-four ASA Ⅰ orⅡpatients, aged 23-60 yr, weighing 45-82 kg, scheduled for elective laparoscopic cholecystectomy, were randomly divided into 3 groups according to the duration of pneumoperitoneum: duration of pneumoperitoneum ≤30 min group (group Ⅰ, n=21), 30 min ＜ duration of pneumoperitoneum ＜ 60 min (group Ⅱ, n=23) and duration of pneumoperitoneum≥ 60 min (group Ⅲ , n=20).The intra-abdominal pressure was maintained at 12-14 mm Hg. Venous blood samples were taken before surgery (baseline, T0 ),at the end of surgery(T1), and at 1, 2 and 3 d after surgery (T2-4) for determination of prothrombin time, activated partial thromboplastin time, concentrations of prothrombin fragment 1+2(F1+2), fibrinogen (Fib), tissue plasminogen activator and plasminogen activator inhibitor type-1 (PAI-1), and activities of antithrombin Ⅲ(AT-Ⅲ)and von Willebrand factor(vWF).Results Compared with groupⅠ , the vWF activity and PAI-1 concentration at T2 , concentrations of Fib, F1+2, PAI-1 and activity of vWF at T3 and concentrations of Fib and F1+2 at T4 were significantly increased, while the AT-IE activity at T3 was significantly decreased in group Ⅲ(P＜0.05) .Conclusion When the duration of pneumoperitoneum is short, no obvious changes in the blood coagulation, fibrinolysis and endothelial damage are observed postoperatively in patients undergoing laparoscopic cholecystectomy, and along with the prolongation of the duration of pneumoperitoneum, increased blood coagulation, reduced fibrinolysisand aggravated endothelial damage are observed postoperatively.

Objective To investigate the effects of regular insulin (RI)on duodenal smooth muscle in diabetic mice. Methods Diabetes mellitus (DM) model was established by intraperitoneal injection of 150 mg/kg streptozotocin (STZ) in male BALB/c mice. The model mice were divided into DM group and DM treated with RI group with 6 each. Meanwhile, 6 normal mice were served as controls. The mice in treatment group were intraperitoneally injected with 40 U/kg of RI daily.Whereas the mice in DM and control groups were intraperitoneally injected with phosphate buffer solution (pH = 7. 40). After 6 weeks, the small intestinal transit rate of mice was determined by lavage of Indian ink. Interstitial cells of cajal (ICC) in duodenal myenteric plexus were counted using immunohistochemical staining. Slow waves of duodenal smooth muscle cells were recorded with intracellular recordings. Data were analysed by SPSS 17.0 software, and comparisons among three groups were done using LSD test. Results After intervention for 6 months, the clinical presentations,such as more water and food intake and polyuria, were improved in treatment group. The body weight was increased in treatment group [(23.33±3.13) g] compared with DM group [(15.42±1.40) g,P＜0.01] ,but dereased compared with control group [(26.78 ± 2.09) g, P＜0.05]. The level of blood glucose in DM group was significantly higher than that in control and treatment groups(P＜0.01). Small intestine transmission rate was significantly reduced in DM group than that in control and treatment groups (P＜0.01), but it was slower in treatment group than that in control group (P＜ 0. 01 ). Immunohistochemical study showed that the number of c-kit positive cells reduced obviously in DM group than that in control group and treatment group (P＜0.05), whereas it was lower in treatment group than that in control group (P ＜ 0.05). The slow wave frequency and amplitude of duodenal smooth muscle cells in DM group were reduced when compared with control and treatment groups (P＜0.01) and both were lower in treatment group than that in control group (P＜0. 01 ). Conclusion The findings indicate that DM mice have gastrointestinal dysmotility and exogenous insulin may improve small intestinal dysmotility in DM mice.

Objective: To analyze the correlation of miR-625 expression with clinicopathological characteristics in esophageal squa-mous cell carcinoma (ESCC) and to explore the effect of miR-625 on the migration and proliferation of ESCC cells. Methods:The expres-sion level of miR-625 was determined through real-time PCR in 86 paired human ESCC tissue specimens and tumor-adjacent normal esophageal tissue specimens, ESCC cell lines, and esophageal epithelial cell line. The associations of miR-625 expression with clinico-pathological characteristics and survival in ESCC patients were analyzed. Transwell and CCK-8 assays were performed to examine the effect of miR-625 expression on migration and proliferation of ESCC cells. Results:Compared with tumor-adjacent normal specimens, miR-625 was significantly downregulated in ESCC tissue specimens (P<0.05). MiR-625 expression was decreased in ESCC cell lines com-pared with human esophageal epithelial cell lines (P<0.05). Lower miR-625 expression was associated with poorer prognosis and sur-vival. The migration and proliferation abilities of ESCC cells were inhibited by miR-625 overexpression (P<0.05). Conclusion:MiR-625 acts as a tumor suppressor gene in the development and progression of ESCC, suggesting that miR-625 may serve as an efficient prog-nosis biomarker and a potential therapeutic target for ESCC.