Morphological, electrical & antibacterial properties of trilayered Cs/PAA/PPy bionanocomposites hydrogel based on Fe3O4-NPs.

Bionanocomposites hydrogel based on conducting polymers were successfully fabricated from chitosan/polyacrylic acid/polypyrrole (CS/PAA/PPy) as well as the magnetite nanoparticle (Fe3O4-NPs) was prepared via co-precipitation method. In addition, different ratios of Fe3O4-NPs were added to the prepared bionanocomposites to enhance the antimicrobial and the electrical conductivity of the prepared conductive hydrogel. Furthermore, the morphology, the swelling percent, antimicrobial activity and the dielectric properties of the prepared conducting bionanocomposites hydrogel were investigated. The antibacterial activities of the experienced microbes were improved with the increasing the loading of Fe3O4-NPs in conducting Bio-nanocomposites hydrogel. Moreover, the DC-conductivity was examined and our resulted indicated that the DC-conductivity was enhanced by increasing the loadings of Fe3O4-NPs compared to that of the pure CS/PAA as well as CS/PAA/PPy.

Heterodimeric l-amino acid oxidase enzymes from Egyptian Cerastes cerastes venom: Purification, biochemical characterization and partial amino acid sequencing.

Two l-amino acid oxidase enzyme isoforms, Cc-LAAOI and Cc-LAAOII were purified to apparent homogeneity from Cerastes cerastes venom in a sequential two-step chromatographic protocol including; gel filtration and anion exchange chromatography. The native molecular weights of the isoforms were 115 kDa as determined by gel filtration on calibrated Sephacryl S-200 column, while the monomeric molecular weights of the enzymes were, 60, 56 kDa and 60, 53 kDa for LAAOI and LAAOII, respectively. The tryptic peptides of the two isoforms share high sequence homology with other snake venom l-amino acid oxidases. The optimal pH and temperature values of Cc-LAAOI and Cc-LAAOII were 7.8, 50 °C and 7, 60 °C, respectively. The two isoenzymes were thermally stable up to 70 °C. The K m and V max values were 0.67 mM, 0.135 µmol/min for LAAOI and 0.82 mM, 0.087 µmol/min for LAAOII. Both isoenzymes displayed high catalytic preference to long-chain, hydrophobic and aromatic amino acids. The Mn2 + ion markedly increased the LAAO activity for both purified isoforms, while Na+, K+, Ca2 +, Mg2 + and Ba2 + ions showed a non-significant increase in the enzymatic activity of both isoforms. Furthermore, Zn2 +, Ni2 +, Co2 +, Cu2 + and AL3 + ions markedly inhibited the LAAOI and LAAOII activities. l-Cysteine and reduced glutathione completely inhibited the LAAO activity of both isoenzymes, whereas, ß-mercaptoethanol, O-phenanthroline and PMSF completely inhibited the enzymatic activity of LAAOII. Furthermore, iodoacitic acid inhibited the enzymatic activity of LAAOII by 46% and had no effect on the LAAOI activity.

Outcome of surgical treatment of patients with upper versus lower urinary tract urothelial carcinoma: stage-by-stage comparison.

OBJECTIVES: It remains controversial whether we can apply similar principles in the management of upper urinary tract urothelial carcinoma (UUT-UC) based on the behavior of bladder urothelial carcinoma (B-UC). We sought to assess whether UUT-UC and B-UC have similar biology and performed a stage-by-stage comparative analysis of outcome between the 2 groups. METHODS: A retrospective review was performed on patients who underwent nephroureterectomy for UUT-UC and radical cystectomy for B-UC from 1991 to 2006. Standard variables were collected and recurrence-free and overall survival (OS) rates were calculated. RESULTS: 280 patients with a median age of 69 years were included (99 UUT-UC treated via nephroureterectomy and 181 B-UC treated via radical cystectomy). Median follow-up was 29 months. None received neoadjuvant chemotherapy. Patients with UUT-UC presented less commonly with invasive disease compared to those with B-UC (44 vs. 77% were >pT2). Overall, 5-year OS for the B-UC group was significantly lower than for the UUT-UC group (60.8 vs. 74.5%, p = 0.02). However, when patients were stratified by stage (>pT2), patients with B-UC had similar OS compared to those with UUT-UC (54.6 vs. 60.8%, p = 0.74). CONCLUSION: Invasive UUT-UC appears to have similar tumor biology compared to B-UC. Whether we can safely extrapolate on the benefit of neoadjuvant and adjuvant strategies to patients with UUT-UC requires further investigation.

Ruptured intracranial dermoid cysts.

Rupture of intracranial dermoid cysts (RICDC) is a rare phenomenon. The mechanism of rupture, pathophysiology of fat in the ventricles and subarachnoid spaces, possible complications, and proper management of such conditions are proposed on the basis of a review of the literature and experience with two cases of ruptured intracranial dermoid cysts (One was in the pineal region, while another was in the fourth ventricle). It is concluded that rupture of intracranial dermoid cysts is usually spontaneous and non-fatal. Persistence of fat in the subarachnoid spaces postoperatively may last asymptomatically for years. Surgery is the only way to deal with these benign lesions. If the capsule is adherent to vital areas, incomplete removal is advised as recurrence and malignant transformation are unlikely to occur.

Laparoscopic bowel injury in an animal model: monocyte migration and apoptosis.

BACKGROUND: Unrecognized laparoscopic bowel injury has a delayed and covert presentation. Differences in monocyte migration and apoptosis between laparoscopic and open bowel injury were determined. METHODS: For this study, 24 rabbits were divided into laparoscopic (n = 9) and open surgical (n = 9) bowel injury groups and a control group (n = 6) without bowel injury. Bowel injury was created using monopolar electrocautery. The animals were killed 1 day, 1 week, and 2 weeks after surgery. Monocyte migration assay was performed across a modified Boyden chamber. Apoptosis was assessed by DNA fluorescent stain H-33342. RESULTS: In laparoscopy, monocyte apoptosis was decreased (p < 0.001), and migration was increased (p < 0.05), as compared with the open group. Apoptosis increased over time in both study groups, and was higher than in the control group (p < 0.001). Migration was decreased in both study groups as compared with the control group (p < 0.05) CONCLUSIONS: These results suggest decreased immune system priming with laparoscopic bowel injury, which may contribute to the masking of relevant signs and symptoms of peritonitis.

Patients with bladder and lung cancer: a long-term outcome analysis.

OBJECTIVES: To report on patient characteristics, stage of disease and long-term outcome and prognosis of patients with dual bladder and lung cancers, as there is an established increased risk of smoking-related second primary cancers, especially lung cancer, developing in patients with bladder cancer. PATIENTS AND METHODS: We reviewed our hospital tumour registry database from 1990 to 2002, and identified 27 patients who had both bladder and lung cancers among 1038 with bladder cancer and 2427 with lung cancer. Seventeen patients had bladder cancer detected before lung cancer (group 1), and the remaining 10 had lung cancer diagnosed first (group 2). RESULTS: Group 1 and 2 were comparable in terms of patients' characteristics, mean interval between cancer detection and their use of tobacco. Group 1 patients had a tendency towards more invasive lung cancer at diagnosis than had group 2 patients (11/17 vs 2/10 stage >/= IIB, respectively; P = 0.082). The mean follow-up was 49.8 and 64.5 months for groups 1 and 2, respectively (not significant). The mean (sd) interval to death from the date of diagnosis of lung cancer was 18 (17) months for group 1 and 65 (42) months for group 2 (P < 0.05). CONCLUSIONS: Patients with bladder and lung cancer who have lung cancer detected first have a lower lung cancer stage and higher overall survival rate than patients diagnosed with bladder cancer first.

Effect of Endo-GIA vascular staple size on laparoscopic vessel sealing in a porcine model.

BACKGROUND: Two sizes of endoscopic gastrointestinal anastomosis (Endo-GIA) staples are currently available for vascular control. The purpose of this study was to compare the Endo-GIA 30-2.0 mm with the Endo-GIA 30-2.5 mm vascular staple. METHODS: The renal blood vessels, aorta, and vena cava were divided laparoscopically using the Endo-GIA 30-2.0 and 30-2.5 mm in four pigs, respectively. The arterial and venous segments were harvested en bloc for ex vivo burst pressure studies. RESULTS: Both 2.0-mm and 2.5-mm staples achieved vessel sealing at supraphysiologic mean burst pressures (> or =310 mmHg). There were no statistical differences between mean burst pressures of vessels stapled by 2.0-mm compared to 2.5-mm staples. Both staples sealed arteries up to 17 mm and veins up to 22 mm in diameter. CONCLUSION: Endo-GIA 30-2.0 mm and 30-2.5 mm vascular staples are equivalent in sealing vessels at supraphysiologic mean burst pressures.

No panacea for drainage after percutaneous nephrolithotomy.

BACKGROUND AND PURPOSE: The optimal postoperative drainage system for patients undergoing percutaneous nephrolithotomy (PCNL) has not yet been determined. Each of the different tubes available has theoretical advantages and disadvantages. The objective of this study was to determine if any one system of post-PCNL drainage has any significant advantage over the others. PATIENTS AND METHODS: Sixty patients were randomized to either a 24F Re-entry tube (Group 1), an 8F pigtail catheter (Group 2), or a double-J stent (Group 3) (N = 20 for all groups). The double-J stent patients also had an 18F Councill catheter as a nephrostomy tube, which was removed on the morning of postoperative day 1. The three groups were well-matched for age, stone size, operative time, and mean number of percutaneous tracts (P > 0.05 for all). Data collected included intraoperative findings, postoperative analog pain scores and narcotic usage, presence of extravasation on postoperative nephrostogram, presence of perinephric fluid on postoperative ultrasound scans, length of stay, and whether leakage from the nephrostomy site persisted more than 48 hours after tube removal. RESULTS: There were no statistically significant differences among the three groups in terms of change in hematocrit or number of patients requiring blood transfusion; in the incidence of tube blockage, extravasation, or presence of perinephritic fluid; or in complication rates, length of hospital stay, or persistent leakage after tube removal. There was a strong trend to less postoperative leakage with the 8F pigtail than the Reentry tube (P = 0.05). Postoperative analog pain scores and narcotic usage were equivalent for all three groups. Patients Groups 1 and 2 were free of all tubes sooner than patients in Group 3 (P < 0.001). CONCLUSIONS: This study did not demonstrate an overwhelming advantage of any one drainage system over the others. All three systems were equally tolerated by patients. There may be less chance of prolonged nephrostomy-site leakage with an 8F pigtail catheter.

Holmium laser enucleation of the prostate can be taught: the first learning experience.

OBJECTIVE: To present the initial experience of a senior urology resident with holmium laser enucleation of the prostate (HoLEP) and to address the difficulties encountered while learning this technique, describing the detailed operative technique and pitfalls. PATIENTS AND METHODS: Between July and August 2001, 27 patients were treated using HoLEP administered by one senior urology resident (A.H.) under the supervision of an experienced urologist (M.M.E.). Patients were assessed before and 1 month after HoLEP by the International Prostate Symptom Score (IPSS), the associated quality-of-life (QoL) score, and measurements of maximum urinary flow rate (Qmax) and postvoid residual urine (PVR) volume. The prostate volume was measured before HoLEP using transrectal ultrasonography. The 27 patients were compared retrospectively with 118 who underwent HoLEP by the supervising urologist. Each of the 27 procedures was taped and reviewed. RESULTS: The mean (range) prostate size was 54.8 (21-122) mL (A.H.) and 61.7 (20.5-172) mL (M.M.E.). The mean operative duration was 98 (50-175) min and the mean enucleation time 68 (29-108) min. The improvements in IPSS, QoL score, Qmax and PVR were highly significant (P < 0.001), with mean values before and after HoLEP of 16.8 and 8.2, 3.1 and 1.4, 7.7 and 20.8 mL/s, and 232 and 41.3 mL, respectively. Of the 27 patients, 23 (85%) were catheter-free on the first day after HoLEP; the mean hospital stay was 1.8 days. All these results were comparable with the results of 118 patients treated by M.M.E. The two most difficult technical steps identified were the initial apical enucleation and the incision of the remaining antero-apical mucosal attachment of the lateral lobes. The operator became adept with the HoLEP technique after a mean of 20 patients. CONCLUSION: HoLEP can be learnt but requires longer training than standard transurethral resection. Extensive experience with transurethral surgery and the supervision of an experienced urologist are prerequisites for success.

The WHO collaborative study on strategies for extending mental health care, III: Evaluative design and illustrative results.

Teams in seven developing countries have adopted a common research design to evaluate new community mental health care services. The nature of the intervention programs varied considerably according to the characteristics of each area. Observations made before the intervention and 18 to 24 months after showed significant changes in the attitudes, knowledge, and diagnostic accuracy of health staff and in community attitudes and reactions. A considerable number of individuals with serious mental disorders received effective care for the first time.