Lignin-based composites for high-performance supercapacitor electrode materials

With the rapid development of the global economy, the depletion of fossil fuels and the intensification of environmental pollution, there is an increasingly urgent need for new and green electrochemical energy storage technologies in society. In this thesis, ligninsulfonate/polyaniline nanocomposites were synthesized by in situ chemical oxidation using aniline as the monomer, lignin as the template and dopant, and ammonium persulfate as the oxidant. The results showed that the average diameter of the ligninsulfonate/polyaniline nanocomposite was 85 nm, and the composite electrode exhibited good electron conduction ability and excellent capacitive performance by ligninsulfonate doping. The electrode material showed the best electrochemical performance when the ligninsulfonate addition was 0.1 g. The specific capacitance can reach 553.7 F g⁻¹ under the current density of charge/discharge 1 A g⁻¹, which is higher than that of the pure PANI electrode. The composite electrode material has good multiplicative performance and cycling stability, and the capacitance retention rate can be maintained at 68.01% after 5000 cycles at a charge/discharge current density of 10 A g⁻¹ (three-electrode system), and the capacitance retention rate can be maintained at 54.84% after 5000 cycles at a charge/discharge current density of 5 A g⁻¹ (two-electrode system).

The lignosulfonate/polyaniline nanocomposite electrode material was made by polymerization of aniline with lignosulfonate as dispersant and structure-directing agent. Redox can convert the catechol/quinone groups on lignin, promoted by electron transfer of polyaniline.     

The effect of maximal surgical cytoreduction on sensitivity to platinum-taxane chemotherapy and subsequent survival in patients with advanced ovarian cancer

ObjectivesLimited information exist about the frequency of micrometastases, their topographic distribution and prognostic impact in patients with cervical carcinoma (CX).MethodsLymph nodes of patients with surgically treated CX, FIGO IB to IIB, with pelvic lymph node involvement, were re-examined regarding the size of metastatic deposits, their topographic distribution within the pelvis. Lymph node status (pN0 vs. pN1mic = metastasis < 0.2 cm vs. pN1 = metastasis > 0.2 cm) was correlated to recurrence free (RFS) and overall survival (OS).Results31.4% of all patients (281/894) represented pelvic lymph node involvement. 22.2.% of the node positive ones showed micrometastases (pN1mic). Most commonly, obturator and internal nodes were affected by pN1mic, without any side differences. Patients with macrometastases (pN1) and micrometastases (pN1mic) represented significant reduced RFS-rate at 5-years (62% [95% CI: 54.2 to 69.8] for pN1 and 68.9% [95% CI: 55.5 to 82.4] for pN1mic) when compared to patients without metastatic disease (91.4% [95% CI: 89.0 to 93.8]; p < 0.001) The 5-years OS-rate was decreased in patients with metastatic disease (pN0: 86.6% [95% CI: 83.7 to 89.5], pN1mic: 63.8% [95% CI: 50.9 to 76.7], pN1: 48.2% [95% CI: 40.4 to 56.0]; p < 0.0001). These differences persisted in detailed analysis within these subgroups. In multivariate analysis, tumor stage, pelvic lymph node involvement and micrometastases were independent prognostic factors.ConclusionsA remarkable number of patients with CX show micrometastases within pelvic nodes. Micrometastatic disease represents an independent prognostic factor. So, all patients with pelvic lymph node involvement, including micrometastatic deposits, might be candidates for adjuvant treatment.     

Surgical and pathologic outcomes of fertility-sparing radical abdominal trachelectomy for FIGO stage IB1 cervical cancer

ObjectivesTo describe the surgical and pathologic findings of fertility-sparing radical abdominal trachelectomy using a standardized surgical technique, and report the rate of post-trachelectomy adjuvant therapy that results in permanent sterility.MethodsA prospectively maintained database of all patients with FIGO stage IB1 cervical cancer admitted to the operating room for planned fertility-sparing radical abdominal trachelectomy was analyzed. Sentinel node mapping was performed via cervical injection of Technetium and blue dye.ResultsBetween 6/2005 and 5/2008, 22 consecutive patients with FIGO stage IB1 cervical cancer underwent laparotomy for planned fertility-sparing radical abdominal trachelectomy. Median age was 33 years (range, 23–43). Histology included 13 (59%) with adenocarcinoma and 9 (41%) with squamous carcinoma. Lymph-vascular invasion was seen in 9 (41%) cases. Only 3 (14%) needed immediate completion radical hysterectomy due to intraoperative findings (2 for positive nodes, 1 for positive endocervical margin). Median number of nodes evaluated was 23 (range, 11–44); and 6 (27%) patients had positive pelvic nodes on final pathology — all received postoperative chemoradiation. Sixteen (73%) patients agreed to participate in sentinel node mapping which yielded a detection rate of 100%, sensitivity of 83%, specificity of 100% and false-negative rate of 17%. Eighteen of 19 (95%) patients who completed trachelectomy had a cerclage placed, and 9/22 (41%) patients had no residual cervical carcinoma on final pathology. Median time in the operating room was 298 min (range, 180–425). Median estimated blood loss was 250 ml (range, 50–700), and median hospital stay was 4 days (range, 3–6). No recurrences were noted at the time of this report.ConclusionsCervical adenocarcinoma and lymph-vascular invasion are common features of patients selected for radical abdominal trachelectomy. The majority of patients can undergo the operation successfully; however, nearly 32% of all selected cases will require hysterectomy or postoperative chemoradiation for oncologic reasons. Sentinel node mapping is useful but until lower false-negative rates are achieved total lymphadenectomy remains the gold standard. Investigating alternative fertility-sparing adjuvant therapy in node positive patients is needed.     

犬食管导联和窦房结区及右心房电位同步记录的研究

目的探讨经食管导联信号平均无创性直接地记录窦房结电位(SNP)的技术。方法对8只犬进行了系列的实验研究,直接将双极电极放置于犬的食管导联、窦房结区和右房等部位进行同步记录与信号叠加同步记录;还对窦房结区、右房、左房等部位的局部电活动进行同步记录与观察;当交界心律出现时,再记录上述电位关系的改变。结果食管导联记录的P前波与窦房结区记录的电位同步,并超前于右心房的电位。结论采用信号平均叠加方法经食管导联所记录的P前波确为窦房结电位。