Artificial neural networks for decision-making in urologic oncology

Artificial neural networks (ANNs) are computational methodologies that perform multifactorial analyses, inspired by networks of biological neurons. Like neural networks, ANNs contain layers of simple points (nodes) of data that interract through carefully weighted connection lines. ANNs are "trained" and balanced by having been previously fed data, which the ANN uses as the means for adjusting its interconnections. Studies have shown that novel and highly accurate ANNs significantly enhance the ability to detect prostate cancer early (high sensitivity) while avoiding a greater number of unnecessary tissue samplings (high specificity). The use of ANNs in prostate cancer is ideal because of 1) multiple predicting factors that influence outcome; 2) the desire to offer individual consulting based on various tests; 3) the fact that prior logistic regression analysis results have had serious limitations in application; and 4) the need for an up-to-date tool that can apply easily to everyone. An ANN should be seen as an important tool that is complementary to the physician's personal knowledge and judgment in making decisions.     

Effect of misoprostol and indomethacin on cyclooxygenase induction and eicosanoid production in carrageenan-induced air pouch inflammation in rats

Effects of misoprostol, a synthetic prostaglandin E1 (PGE1) analogue, on cyclooxygenase-2 (COX-2) protein level and exudate prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) level were investigated in acute carrageenan-induced air pouch inflammation in rats. Treatment with misoprostol (12.5, 25, and 50 microg/kg) has been started in separated groups, 30 min and 2 days before carrageenan injection and it was given twice a day (total of five doses) by orogastric route. Indomethacin, in doses of 0.5 and 5 mg/kg, and specific COX-2 inhibitor SC-58236, in doses of 5, 10, and 20 mg/kg were given 1 h before carrageenan injection by the orogastric route. Misoprostol increased the levels of PGE2 and COX-2 protein at all doses applied. Despite indomethacin and SC-58236 increased the level of COX-2 protein when they used alone, these drugs partially inhibited misoprostol-induced increase in the level of COX-2 protein. Partial inhibition of misoprostol-induced increase in the level of COX-2 protein by indomethacin or SC-58236 may indicate the modulatory roles of endogenous prostaglandins (PGs, especially, PGE2) on the COX-2 expression.     

Laparoscopic prostatectomy: where do we stand?

Laparoscopic radical prostatectomy is an effective treatment for localized prostate cancer. This cost-intensive and technically demanding operation currently takes longer than the standard open procedures, but with increasing experience, it is eventually associated with lower costs and is nearly as fast. As more urologists gain such experience, the laparoscopic approach may challenge the standard approaches.     

Effect of Helicobacter pylori eradication on peptic ulcer disease complicated with outlet obstruction

Background. At present, the prevalence of Helicobacter pylori ( H. pylori ) in complicated peptic ulcer and the effect of H. pylori eradication on complicated peptic ulcer have not been fully established. In this study, we report the prevalence of H. pylori in peptic ulcer patients complicated with gastric outlet obstruction, effectiveness of oral eradication therapy on these patients, and their long-term follow up.
Patients and Methods. Ten consecutive patients presenting with clinically and endoscopically significant obstructed peptic ulcers were included in this study. During each endoscopy, seven gastric biopsy specimens were obtained and analyzed for H. pylori colonization.
Results. The antral mucosal biopsy specimens were positive for H. pylori in nine patients. H. pylori infection was eradicated and complete ulcer healing was observed in all patients. The mean follow-up period was 14 (7–24) months. One patient had duodenal perforation and underwent surgical intervention following medical treatment, despite the eradication of H. pylori. Ulcer recurrence was noted in two (22.2%) of nine patients, and in one of them the recurrent ulcer was complicated with obstruction (11.1%). The mean time to ulcer recurrence was 17 months (range, 10–24 months). The biopsies and CLOtests were H. pylori negative at the time of ulcer or erosion recurrence in two patients.
Conclusion. We suggest that H. pylori eradication may improve the resolution in obstructive ulcer cases with colonization.     

Can Willingness and Hands-on Work Together? Teaching Biological Evolution and Dealing with Barriers

This qualitative research aims at first defining how pre-service science teachers think regarding the theory of evolution (TOE) with a particular hands-on and minds-on activity (The article by O’Brien (Am Biol Teach 62(8):578–582, 2000) entitled A toilet paper timeline of evolution: 5 E cycle on the concept of scale is modified and applied in the present research as an intervention process.) Finally, specific suggestions in instructional techniques are offered based on a geological time scale. At the end of intervention, the research follows how participants respond to what they found out or came across. If participants had common misconceptions regarding the TOE, these are revealed. The present research was conducted in two spring semesters of 2009 and 2010 in a geology course. The participant number of the study was 129. The research lasted three weeks. Research results showed that participants were generally misinformed regarding conceptual knowledge of the TOE. Approximately half of the participants did not believe (the term believing in or acceptance of the TOE does not affect research findings) in the TOE. Mostly, they thought that there is no place for human evolution in Islam. Few of them could reconcile scientific information with their own Islamic point of view. Even though they did not believe in the TOE, most of them accepted that they did not have adequate knowledge regarding the TOE. They mostly said they were shocked about the first appearance of human beings in the geological time scale, which is the main issue in the present research. After intervention, conceptual change was considerable, though this is a secondary concern. The results also show that even though students were quite prejudiced regarding the TOE, they were ready to explore it deeply. Such concrete activities might be helpful to push students to think over the TOE. However, there are numerous barriers such as ill-prepared science textbooks and websites, unwillingness of instructors, and official policy of the Ministry of National Education.     

Graphitization as a Universal Tool to Tailor the Potential‐Dependent Capacitance of Carbon Supercapacitors

Most efforts to improve the energy density of supercapacitors are currently dedicated to optimized porosity or hybrid devices employing pseudocapacitive elements. Little attention has been given to the effects of the low charge carrier density of carbon on the total material capacitance. To study the effect of graphitization on the differential capacitance, carbon onion (also known as onion‐like carbon) supercapacitors are chosen. The increase in density of states (DOS) related to the low density of charge carriers in carbon materials is an important effect that leads to a substantial increase in capacitance as the electrode potential is increased. Using carbon onions as a model, it is shown that this phenomenon cannot be related only to geometric aspects but must be the result of varying graphitization. This provides a new tool to significantly improve carbon supercapacitor performance, in addition to having significant consequences for the modeling community where carbons usually are approximated to be ideal metallic conductors. Data on the structure, composition, and phase content of carbon onions are presented and the correlation between electrochemical performance and electrical resistance and graphitization is shown. Highly graphitic carbons show a stronger degree of electrochemical doping, making them very attractive for enhancing the capacitance.     

Prostate specific antigen levels after acute myocardial infarction

Prostate Specific Antigen (PSA), a member of kallikrein family, is a specific serine protease of prostatic tissue. In some case reports, changes in PSA levels after acute myocardial infarction (AMI) have been reported. In this study we evaluated variations in PSA levels post-AMI. Twenty-six male patients who had PSA levels within reference limits were included in the study. The diagnosis of AMI was confirmed by clinical findings, ECG (electrocardiogram) and cardiac marker studies. Serum total PSA (tPSA) and free PSA (fPSA) levels were measured at days 0 (day of admission), 1, 2 and 3 after AMI. PSA/albumin ratio was also calculated in order to evaluate the effect of dilution. A statistical analysis of the results of all patients revealed significant decrease in tPSA levels and tPSA/Albumin ratio at day 2 when compared to days 0 and 3, which showed a similar pattern. Changes of fPSA and fPSA/ Albumin ratio according to days were not found significant. In only four patients we found increased levels of tPSA and increased fPSA levels in three of them. These patients displayed severe problems such as renal failure, cardiac failure, ventricular aneurysm and cerebral ischemia due to cardiac arrest. The lower tPSA levels on day 2 suggest that tPSA can be eliminated rapidly from the circulation on days 1 and 2, probably through the formation of complexes of tPSA with acute phase proteins.