Abstract Benzo [a] pyrene ( B [a] P ) is a well-recognized environmental pollutant. Exposure to B[a]P elicits many adverse biological effects, including tumorigenesis, immunosuppression, teratogenicity, and hormonal effects. In addition to B [a] P exposure-induced genetic damages, a growing number of studies demonstrate that epigenetic changes play an important role in chemically induced carcinogenesis. In order to provide better understanding of epigenetic changes of B [a] P and their potential association with genotoxic endpoints, this review summarizes the advances in the applications of functional genomics in the research of B [a] P toxicity, including functional genomics techniques, regulation of human genome expression, DNA sequence variability, model organisms research, and bioinformatics studies, so as to provide insights into the management of B [a] P exposure-induced health injuries and use of genomics techniques to unravel the mechanisms underlying the toxicity of other environmental pollutants.

Objective To explore the effect iveness and safety of ProSeal laryngeal mask(PLMA)used in posterior spinal surgery. Methods Forty ASA Ⅰ - Ⅱ patients of thoracic-lumbar fracture were randomly divided into PLMA group and tracheal intubation (TI) group by systematic sampling with 20 cases each. PLMA or TI was inserted after intravenous anesthesia induction. The number of intubation, intubation time and time to surgery were recorded, systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) were recorded induction (To), during intubation (T1), at 1 min (T2),3 min(T3), 5 min (T4), 10 min after intubation (T5), during extubation (T6). The intubation, extubation, and the maintain ventilation process of the respiratory and respiratory damage were recorded. Results All patients in PLMA group and TI group achieved satisfactory lung ventilation at the first attempt. There were no significant difference in the number of intubation, intubation time and time to surgery between two groups (P ＞ 0.05 ).SBP,DBP,HR at T1,T2,T3,T6 in TI group were significandy higher than To and those in PLMA group (P＜0.05). The intubation, extubation, and the maintain ventilation process of the respiratory and respiratory damage in TI group (5,25,36 cases) were more than those in PLMA group (0,1,6 cases)(P ＜0.05).Conclusion PLMA for posterior spinal surgery is safe and effective.

Objective To compare the effect of proseal laryngeal mask airway(PLMA)and esophageal tracheal combitube(ETC)used in adult patients of difficult airway in perioperation.Methods Forty ASA Ⅰ-Ⅱadult patients of difficult airway were randomly divided into two groups:PLMA group and ETC group,each group was 20 cases.After intravenous anesthesia induction,PLMA or ETC was inserted by routine methods.The number of intubation,intubation time and time to surgery were recorded.The systolic blood pressure(SBP),diastolic blood pressure(DBP)and heart rate(HR)were recorded before intubation (T_1),during after intubation(T_2),at 1 min(T_3),5 min(T_4),10 min(T_5)after intubation,during extubation(T_6).The intubation,the extubation and the maintain ventilation process of the respiratory complications and respiratory damage were recorded.Results All patients in PLMA group and ETC group achieved satisfactory lung ventilation at the first attempt.The number of intubation,intubation time and time to surgery were not different between the two groups(P＞0.05).SBP,DBP,HR at T_2,T_3,T_6 in ETC group [T_2:(143.2±11.4)mm Hg(1mm Hg=0.133kPa),(86.9±10.7)mm Hg,(145.8±10.2)times/min,T_3:(140.0±11.3)mm Hg,(84.5±10.7)mm Hg,(142.5±11.5)times/min,T_6:(147.7±11.3)mm Hg,(87.2±9.7)mm Hg,(145.4±10.9)times/min]were significantly higher than those in PLMA group[T_2:(123.5±12.7)mm Hg,(72.6±11.4)mm Hg,(129.0±11.0)times/min,T_3:(120.0±11.5)mm Hg,(69.7±10.5)mm Hg,(125.7±10.6)times/min,T_6:(122.5±11.6)mm Hg,(71.4±9.4)mm Hg,(127.8±11.3)times/min]and at T_1 in ETC group[(122.7±12.1)mm Hg,(74.1±9.6)mm Hg,(121.0±11.8)times/min](P<0.05).Respiratory complications and damage were no significant difference between the two groups(P＞0.05).Conclusion PLMA and ETC can achieve satisfactory lung ventilation used in adult patients of difficult airway in perioperation,they are safe and effective airway management device,but PLMA used in adult patients of difficult airway in perioperation is better than ETC in keeping stable hemodynamics and producing less stress responses.

Objective To measure the magnitude of galvanic currents produced by different occluding metallic contact.Methods The circuits of instantly different metallic contact were simulated in artificial saliva,and electrical potential of every couple and 15 currents of instant contact were measured.To simulate night sleep,after 8 h soaking,15 currents were obtained in addition.Results During early soaking,gold/Co-Cr alloy produced the highest current(6.17 ?A),while there were significant differences in currents between gold/zinc-free amalgam,gold /zinc-containing amalgam and other couples(P0.05),and the current value was low all the time.Potential of zinc-containing amalgam was more negative than other alloys,and it was always under anodic behavior during the experiment and was corrupted acceleratedly.Conclusion Couples of gold/titatium,gold/zinc-containing amalgam,zinc-free/zinc-containing amalgam appearing in oral will do harm to the patients′health,while Co-Cr/zinc-free amalgam can coexist in oral.Corrosion behavior of amalgam is affected by different contents of zinc.

To review the literatures on the treatment of sleep disorder with acupuncture and moxibustion in China in recent years. we believed that combined acupuncture and medicine, acupuncture and auricular acupuncture had obvious advantages in the treatment of sleep disorder after stroke.

OBJECTIVE To investigate the distribution and antibacterial resistance of nosocomial infection from a new hospital pathogens,and provide reference for clinical rational use of drugs.METHODS Statistical methods were used to analyze the data of pathogen′s formation,distribution and antibacterial resistance of a new hospital.RESULTS A total of 1852 clinical isolates were collected from Mar 2005 through Mar 2007,of which Gram-negative microorganisms and Gram-positive cocci accounted for 71.0 % and 29.0%,respectively.The most commonly encountered pathogens were Pseudomonas aeruginosa,Escherichia coli,Klebsiella spp,Acinetobacter,Staphylococcus aureus and coagulase-negative Staphylococcus.Except Acinetobacter,up to 6% strains of Gram-negative microorganisms were resistant to the imipenem,meropenem and piperacillin/tazobactam;Gram-positive cocci were still highly sensitive to vancomycin and teicoplanin.CONCLUSIONS A new hospital is similar with other hospitals in the data of formation,distribution and antibacterial resistance of nosocomial infection pathogens.

BACKGROUND: The invasion of highly metastatic carcinoma cells on reconstituted basement membrane component is considered as a common model for in vitro experimental studies of invasion and metastasis of malignant tumors. It has been reported that synthetic peptide influences some tumor cells. However, the effect of synthetic peptide on highly metastatic human lung giant-cell carcinoma cell(PG) has been rarely studied.OBJECTIVE: To study the effects of synthetic peptide RGD, YIGSR and their derivatives on invasive ability of PG in vitro.DESIGN: A completely randomized controlled trial was conducted.SETTING and MATERIALS: The human lung highly metastatic tumor and NIH3T3 cell line were both supplied by the Department of Pathology of Beijing Medical University. The synthetic peptides were provided by the Synthetic Laboratory of the Institute of Materia Medica of the Chinese Academy of Medical Sciences and Chengde Medical College. Transwell invasion chamber was purchased from Costor Company. The whole experiment was conducted at the Department of Biochemistry of Chengde Medical College.INTERVENTIONS: NIH3T3 cell line was used to prepare chemotactic factor. PG cells were seeded in Transwell invasion chamber. Under the effect of chemotactic factor, the effects of synthetic peptides on PG invasive ability were examined.MAIN OUTCOME MEASURES: PG cell number of passing through the reconstituted basement membrane was used as an index to evaluate the invasive ability of tumor cells.RESULTS: An appropriate number of PG cells were cultured for 10 hours with chemotactic factor, and the number ofinvasive cells reached a number range that can be applied to statistical analysis(50 to 100 invasive cells). After 100 mg/L of synthetic peptides RGD, YIGSR were incubated for 48 hours with PG cells,the rate of inhibition on invasive ability was 53.63% and 36.86% respectively, and 0% and 6.48% respectively after incubation for 10 hours.CONCLUSION: The PG cells were the proper cells for in vitro experimental studies of invasive ability of cancer cells for the purpose of screening of anti-tumor medicine. RGD and Juncha/Zacha-peptide YIGSR showed a strong activity in inhibiting tumor invasion and a potential value in prevention and treatment of malignant tumor development.

Objective To evaluate the effect of permanent right ventricular apical (RVA) pacing in different cumulative percent of right ventricular pacing( CUM% VP) on the heart function and cardiac ventricle structure in subjects with normal basic heart function. Methods Patients who had implanted pacemaker when heart function was still normal were recruited in the study while they revisited for replacement or examinations of implanted pacemaker at outpatient. According to different CUM% VP, patients were divided into group A ( CUM% VP≥85% ,n =78) and group B( CUM% VP≤40% ,n =63) . The primary composite endpoint was defined as new-onset heart failure, death, left ventricular ( LV ) dysfunction and remodeling. The occurrence of endpoints were compared between the two groups. The left ventricular end-diastolic diameter (LVEDD), left ventricular ejection fraction (LVEF) and interventricular septum(IVS) were measured through baseline and follow-up, their absolute alterations ( △ LVEF, △ LVEDD and △ IVS ) were observed. Results The mean duration of two assessment was 7.4 years in group A and 7.7 years in group B, respectively. Before pacemaker implantation,there were no differences in age, sex, basic diseases, cardiac function and constituent ratio of pacemakers between the two groups. By comparing the outcomes of group A with those of group B at the end of follow up, we found that: △ LVEDD in group A was significantly larger than that in group B ( [3. 8 ± 0. 5] mm vs [1.4 ± 0. 4] mm,t = 4. 540,P ＜ 0. 01 ), △ LVEF was ( - 6.5 ± 1.2) % and ( - 3.3 ± 1.0) % in group A and B, respectively,with significant difference between the two groups(t = 2. 578 ,P ＜0. 01 ). There were no significant difference in AIVS between the two groups. No death occurred in both group at the end of follow up. The incidence of LV dysfunction and remodeling was 25.6% (20/78) in group A,which was significantly higher than that of 6.3% (4/63) in group B( x2 =9. 183 ,P =0. 002). and the incidence of new-onset heart failure was 10. 3% (8/78)in group A,which was significantly higher than that of 1.6% (1/63) in group B (x2 =4.383,P =0.036).Conclusion Among patients with normal basic LV function who underwent permanent RVA pacing,there are potential risk in developing LV remodel, function damage and heart failure. The risk increases with the pacing time getting longer and CUM% VP getting higher.

Objective To evaluate the lateral profile changes after the functional appliance was used to put forward the mandible. Methods Thirty one cases of maloclusion (subclass Ⅰ of the class Ⅱ) were selected,in which all the mandible were in a backward position revealed by clinical examination and roentgenographic cephalometry.Functional appliance was used to put forward the mandible,and then the changes of IMPA, Z angle, H angle, soft tissue profile angle, upper lip E Line, lower lip E Line, upper lip/lower lip, and lower facial height were compared before and after treatment. Results All of the cases showed up a better improvement of the profile after the functional appliance therapy. Z angle, H angle, soft tissue profile angle, upper Lip E line, upper Lip/lower lip, lower facial height became normal or close to normal.There was a statistical significantce in the changes ( P

Objective To investigate the effect of ? 3-adrenoceptors(? 3-AR) on rat detrusor instability(DI) secondary to bladder outflow obstruction(BOO). Methods Animal models of DI were made in 15 female Wister rats.The filling cystometry was conducted after 6 weeks,and the rats were divided into DI group and detrusor stabitily (DS) group based on the detrusor function. The effects of ? 3-AR agonist BRL37344A on the frequency of contraction and relaxation response to isolated detrusor were examined by means of the in vitro detrusor strip study.And the expression of ? 3-AR subtypes mRNA was investigated in rat detrusor muscle by RT-PCR. Results The occurrence rate of DI was 67%(10/15).BRL37344A could inhibit the contraction frequence and amplitude of the isolated detrusor which was concentration-dependent.The intensity did differ significantly between normal controls or DS group and DI group.The relative contents of ? 3-adrenoceptor mRNA in DI group,controls and DS group were 10.27?3.54,19.84?2.62 and 18.38?1.95.There was a significant decrease in the concentration of ? 3-adrenoceptors in DI group compared with controls and DS group( P