In China, the crude oil supply is highly dependent on overseas countries, and thus strengthening crude oil self-sufficiency has become an important issue of the national energy security. Tertiary oil recovery, especially polymer flooding, has been widely applied in large oil fields in China, which can increase the recovery rate by 15%-20% compared with water flooding. However, the widely used oil flooding polymers show poor thermal stability and salinity tolerance, complicated synthesis ways of monomers, and environmental unfriendliness. Moreover, the polymer flooding induces problems including pore plugging, heterogeneity intensification, high dispersion of remaining oil resources, pressure rise in injection wells, and low efficiency circulation of injection medium, which restrict the subsequent recovery of old oil fields. Here, we systematically review the developing and current situations of polymer flooding, introduce the innovative biomanufacturing of oil flooding polymers and their monomers or precursors as well as low-cost bio-based chemical raw materials for multiple compound flooding. The comprehensive study of the relationships between microbial fermentation metabolites and polymer flooding will reveal the green and low-carbon paths for polymer flooding. Such study will enable the application of enzymes produced by microorganisms in polymer production and polymer plugging removal after polymer flooding as well as the application of microbial metabolites such as biosurfactants, organic acids, alcohols, biogas, and amino acids in enhancing oil recovery. This review suggests that incorporating biomanufacturing into polymer flooding will ensure the high productivity and stability for crude oil production in China.
Polymers/metabolism* ; China ; Petroleum ; Oil and Gas Fields

Objective:To explore the hemodynamic and comfort effect of modified prone-flexed position in complexity renal calculi patients undergoing percutaneous nephrolithotomy.Methods:A total of 82 cases of complexity renal calculi patients who undergoing percutaneous nephrolithotomy were recruited and randomly assigned to experiment group (41 cases) and control group (41 cases). Patients in the control group were placed in conventional prone position, while in the experiment group were placed in modified prone-flexed position. The data include blood pressure, heart rate, respiratory rate, saturation of blood oxygen were recorded at preoprative, lithotomy position, change position 30 minutes after operation and postoperative. The General Comfort Questionnaire (GCQ) score was recorded in patients for postural comfort. The clinical data was also compared between two groups.Results:There was no significant difference in blood pressure, heart rate, respiratory rate, saturation of blood oxygen between experiment group and control group ( P>0.05). Compared to (44.95±4.80) min, 90.2% (37/41) of the control group, the patients in the experiment group was (47.80±6.71) min, 73.2% (30/41), which showed a shorter average operation time and higher total stone clearance rate, the differences were statically significant ( tvalue was 2.216, χ2value was 3.998, P<0.05). At immediately and 30 minutes after operation, the skin pressure were 9 cases and 4 cases in the experiment group, 18 cases and 11 cases in the control group, the differences were statically significant ( Zvalues were 2.132, 2.038, P<0.05). After 48 hours of surgery, the physical subscale and totl GCQ score were (13.32±1.40) and (78.56±4.65) pionts in the experiment group, significantly higher than (12.17±1.41), (75.76±5.16) pionts in the control group, the differences were statically significant ( tvalues were 3.685, 2.584, P<0.01 or 0.05). Conclusion:Modified prone-flexed position can shortern operation time decrease the risk of pressure injury and demonstrate better postural comfort of patients with complexity renal calculi undergoing percutaneous nephrolithotomy.

Objective To investigate the curative effect and mechanism of α lipoic acid combined with epalrestat and methylcobalamin in patients with type 2 diabetes mellitus (T2DM) complicated with pe-ripheral neuropathy ( DPN) . Methods A total of 160 cases of patients with DPN were randomly divided into the control group ( treated with methylcobalamin and epalrestat) and the observation group ( treated with methylcobalamin, epalrestat and α lipoic acid) , and all patients were treated for 4 weeks. The therapeutic effect, nerve conduction velocity, oxidative stress index and related proteins expression in serum were ob-served in two groups. Results The effective rate of treatment in the observation group was higher than that in the control group (87. 50％ vs 75. 0％) (χ2 = 4. 103,P<0. 05). After treatment, the sensory nerve conduction velocity ( SNCV) and motor nerve conduction velocity ( MNCV) of median nerve and common peroneal nerve were significantly better in the observation group than the control group ( P<0. 05 ) . After treatment, the level of superoxide dismutase ( SOD) was significantly higher in the observation group than the control group, while the level of malondialdehyde ( MDA ) was significantly lower the control group (P<0. 05). After treatment, the level of Bcl-2 protein was significantly higher in observation group than the control group, while the levels of Bax and Caspase-3 proteins were significantly lower than the control group (P<0. 05). Conclusions The application ofαlipoic acid combined to epalrestat and methylcobal-amin in the treatment of DPN can significantly improve the sensory and motor nerve conduction.

Objective According to results from the two-month consecutive surveillance program in Maanshan,six suspected cases of non-O1 non-O139 Vibrio (V.) cholerae infection,were found that called for identification of pathogens as well as molecular-epidemiological analysis to determine the aggregation of the epidemic situation.Methods Biochemical and serotype identification,hemolysis test,and drug sensitive test were used to detect the drug resistance spectrum.Real-time PCR and conventional PCR were used to detect the presence of V.cholerae specific genes,virulent genes and its related genes,including ompW,ctx,tcpA,toxR,hlyA,zot,ace,rstR and g ⅢCTX.Pulsed-field gel electrophoresis (PFGE) was used to analyze the molecular type of strains.Results All the six isolates of non-O 1 non-O 139 V.cholerae were identified by biochemical and serologic tests,and appeared to be β hemolytic.Twelve out of the 14 kinds of drugs showed 100％ sensitive.All isolates were positive of ompW gene by real-time PCR,but negative for ctx,tcpA,zot,ace,rstR and gⅢ CTK.Five of the six isolates were positive for toxR and hlyA,except for strain 1001434446.All strains had different PFGE types,but two strains had similar types.All strains had a low similarity compared to the toxigenic V.cholerae.Conclusion Six cases ofnon-O1 and non-O139 nontoxigenic V.cholerae infection appeared in the same period.Along with epide(m)iological information,we noticed that these cases had a sporadic nature,but frequently appeared in the same area.We got the impression that public health measurements should be strengthened,with special attention paid to those diarrhea outbreaks caused by non-O 1 /non-O 139 strains since V.cholerae had appeared in low incidence.

OBJECTIVETo study the epidemiological characteristics and molecular phenotypes of Salmonella by pulsed-field gel electrophoresis (PFGE) in Beijing from 2008 to 2009.

METHODSA total of one hundred thirty-seven isolates recovered from the WHO Global Salmonella Surveillance system and entero clinic surveillance system were identified by biochemical tests and serotyping. The related epidemiological informations were also analyzed. The isolates were further typed by PFGE.

RESULTSThe prevalence of Salmonella from 2008 to 2009 showed obvious seasonal character. High incidence occurred from June to September, and 64.1% (84/131) isolates were recovered in this period. Patients of 18 - 40 year-old were 46.1% (58/128) and 80 patients were male and 40 patients were female with the ratio of 1.57:1. These 137 Salmonella isolates belonged to 20 serotypes, including Enteritidis (46.7%, 64/137) and Typhimurium (17.5%, 24/137) as the dominant serotype. In total, 71 PFGE profiles were identified. Four PFGE patterns of S. Enteritidis isolates (JEGX01.CN0001, JEGX01.CN0003, JEGX01.CN0002, JEGX01.CN0019) and S. Typhimurium pattern of JPXX01.CN0001 were dominant patterns.

CONCLUSIONThe prevalence of Salmonella from 2008 to 2009 showed distribution characteristics of sex, age and seasons. The numerous PFGE patterns of Salmonella showed diversity of these isolates and different clones existed in Beijing.

Adolescent ; Adult ; Bacterial Typing Techniques ; China ; epidemiology ; DNA, Bacterial ; isolation & purification ; Electrophoresis, Gel, Pulsed-Field ; Female ; Food Microbiology ; Humans ; Male ; Molecular Typing ; Salmonella ; classification ; genetics ; isolation & purification ; Salmonella Infections ; epidemiology ; microbiology ; Serotyping ; Young Adult

Objective: To discuss the clinical features of basaloid squamous carcinoma(BSC)and the factors relating to its prognosis and to compare patient survival between poorly differentiated squamous cell carcinoma(PDSC)and BSC. Methods: Clinical and pathological data of BSC and PDSC cases seen in our hospital between January 2004 and December 2008 were reviewed. Results: There were no statistical differences in demographic and clinical features between PDSC and BSC patients,with the exception that a larger proportion of BSC patients were female(P=-0.001).Additionally,higher tobacco consumption was observed among BSC male patients (P=0.003).There were no significant differences in survival rate between BSC and PDSC groups(X2=0.03,P=0.5470).The median survival time of BSC and PDSC patients was 19 months and 30 months，respectively.The 4-year survival rate was 22.4%and 36.1%，respectively(u=0.740,P=0.230).No significant difference was found in survival rate between stage Ⅰ and stage Ⅱ patients(X~2=0.109，P=0.2974).The median survival time of stage Ⅰ and stage Ⅱ patients was 19 months and 46 months，respectively；and the 4-year survival rate of stage Ⅰ and stage Ⅱ patients was 47.3% and 45.2%，respectively(u=0.122，P=0.450).Using Cox proportional hazard model，we found that surgical types and clinical stages of BSC were correlated with its prognosis.Compared with that of patients who received lobectomy,the postoperative mortality hazard of patients who received pneumonectomy and segmentectomy was increased by 1.379 times(P=0.031)and 1.634 times(P=0.061)，respectively.A more advanced clinical stage was associated with an increase in the postoperative morta,ty hazard ratio(X~2=14.12,P=0.000).The postoperative mortality hazard of patients of stage Ⅲ and stage Ⅳ was 2.437 times higher than that of stage Ⅰ patients(P=0.018).There were no statistical differences in postoperative mortality risk between stage Ⅰ patients and stage Ⅱ patients(P=0.057). Conclusion: Compared with that of PDSC,the incidence of BSC is higher among females.However,there is no difference in the prognosis between BSC and PDSC.BSC can be treated with the same therapies as those for other types of non-small cell lung cancer(NSCLC).

Objective To investigate the clinical and pathological features, diagnosis and treatment of Castleman disease (CD).Methods Clinical features and related information on diagnosis and treatment of eight cases of CD were retrospectively analyzed.The size of involved lymph nodes ranged from (2 cm×2 cm×3 cm)-(4 cm×3 cm×2 cm).The lymph nodes were found in level Ⅰ (1 case), level Ⅱ (3cases) ,level Ⅲ (3 cases) and level Ⅳ (1 case).CT examination in eight patients showed the lesions manifested as ellipse soft masses.Dynamic contrast CT scan in four patients showed ring-enhanced area around the masses.Blood routine examination in eight patients were generally normal, with six patients had mild anemia.Results Based on the clinical classification, all lesions in this group were localized CD.Histopathology indicated that all lesions were of hyaline-vascular type. After surgery, there was no recurrence during the follow-up period. ConclusionsPatients with localized CD mainly have lymphadenectasis in a single location.The CT scan can give some evidence.Surgery should be given first priority.

Objective To identify the isolates of Shewanella spp.from specimens of food poisoning based on biological and biochemical analysis.Methods Strains were obtained from the investigation on two food poisoning episodes in September and October,2007 in Ma'anshan city,Anhui province.In accordance with the national standard protocol(GB/T 4789),all specimens were enriched and isolated on selective medium,and the suspected strains were ldentified by the VITEK-32 and API20E systems.For Shewanella spp.identified by the biochemical system,more characteristics were analyzed using auxiliary biochemical,growth,hemolytic and drug-resistance tests.DNAs of Shewanella spp.were extracted,16S rDNA was PCR amplified and sequenced with universal 16S rDNA primers.Phylogenetic tree was constructed with MEGA 4.0.Results After enrichment, all specimens were inoculated to selective medium and Shewanella spp.strains were isolated from 8 samples with single colony on both TCBS and BP media.The characteristics of growth in the Triple Sugar Iron (TSI) agar appeared to have had hydrogen sulfide production but no gas production or positive oxidase.No Shewanella spp.strain was detected in WS,SS and EMB media.The 8 strains were identified as Shewanella algae(S.algae) or Shewanella putrefaciens(S.putrefaciens) by VITEK-32,as S.putrefaciens by API20E system.No other enteropathogenic bacteria,including Vibrio cholerae,Salmonella,Vibrio parahaemolyticus,Proteus vulgaris or Staphylococcus aureua,were detected from those 8 samples.From 16S rDNA phylogenetic trees,7 out of 8 ShewaneUa spp.were identified as S.algae.1 as S.putrefaeiens.Conclusion Strains of Shewanella spp.were lsolated from samples of the food poisoning episodes,providing a possible clue to investigate the role of Shewanella spp.on food poisoning

Objective To investigate the effect of acute hypervolemic hemodilufion (AHHD) on EC50 of propofol by target-controlled infusion (TCI) for loss of consciousness (LOC). Methods Sixty ASA Ⅰ or Ⅱ patients aged 18-64 yr scheduled for vertebral eolunm or total hip replacement surgery were randomly divided into 4 groups (n = 15 each) : group Ⅰ target plasma concentration of propofol (Tp) ;group Ⅱ target effect-site concentration of propofol (Te) ;group Ⅲ AHHD + Tp and group Ⅳ AHHD + Te. All the patients recoived iv infusion of lactated Ringer's solution 0.7 ml·kg-1 ·h-1 via peripheral vein for 30 min. At the same time 4% gelofusion 15 ml/kg was infused over 30 min via internal jugular vein in group Ⅲ and Ⅳ. At the end of gelofusine infusion TCI of propofol was started. The initial target concentration was set at 1.2 μg/ml. After the target concentration was steadily maintained for 30 s, the consciousness of the patients was evaluated by an anesthesiologist not involved in the study using OAA/S scale. The target concentration was increased in 0.3 μg/ml increment until the patients lost consciousness (OAA/S = 0). The target plasma concentration and effect-site concentration were then recorded. EC50 and 95% confidence interval (CI) of propofol for LOC were calculated by probit analysis. Results The ECho (95 % CI) of propofol for patients in group Tp, Te, AHHD + Tp and AHHD + Te (group Ⅰ-Ⅳ) were 3.74 (3.46-4.16), 2.32 (2.17-2.42), 4.12 (3.81-4.32) and 2.38 (2.14-2.56) μg/ml respectively. EC50 was significantly higher for loss of consciousness in AHHD + Tp group (group Ⅲ)than in Tpgroup (group Ⅰ), but there was no significant difference in EC50 between group Te and group AHHD + Te. Conclusion AHHD can increase the EC50 of target plasma concentration of propofol by TCI for LOC but has no effect on EC50 of target effect-site concentration.

Adolescent ; Adult ; Aged ; Brain ; blood supply ; diagnostic imaging ; Carbon Monoxide Poisoning ; diagnostic imaging ; Child ; Female ; Humans ; Male ; Middle Aged ; Tomography, Emission-Computed, Single-Photon