Shock tube and chemical kinetic modeling study of the oxidation of 2,5-dimethylfuran.

A detailed kinetic model describing the oxidation of 2,5-dimethylfuran (DMF), a potential second-generation biofuel, is proposed. The kinetic model is based upon quantum chemical calculations for the initial DMF consumption reactions and important reactions of intermediates. The model is validated by comparison to new DMF shock tube ignition delay time measurements (over the temperature range 1300-1831 K and at nominal pressures of 1 and 4 bar) and the DMF pyrolysis speciation measurements of Lifshitz et al.

Retroperitoneal Leiomyosarcoma Associated with an Elevated beta-HCG Serum Level Mimicking Extragonadal Germ Cell Tumor.

Patient. A 65-year-old man was admitted with a large primary retroperitoneal tumor and an increased beta-human chorionic gonadotropin (beta-HCG) serum level. A germ cell tumor was suspected; however, a computed tomography-guided biopsy failed to enable tumor classification.

Changing comorbidity classification patterns at radical prostatectomy during a 10-year period.

Objective: To investigate the consistency of several comorbidity classifications and concomitant diseases at radical prostatectomy (RP) during a 10-year period.

Methods And Materials: In 1,297 patients who underwent RP between 1993 and 2002, age and several comorbidity classifications were derived from patient records and assigned to the year of surgery. Trends were evaluated using the Cochran-Armitage trend test.

Comparison of tumor- and comorbidity-related predictors of mortality after radical prostatectomy.

Objectives: To identify and compare tumor- and non-tumor-related predictors of survival after radical prostatectomy and to incorporate the latter into the tumor node metastasis classification of prostate cancer.

Material And Methods: A total of 402 patients who underwent radical prostatectomy (mean follow-up period 6.9 years) were stratified according to postoperative tumor stage, Gleason score, prostate-specific antigen level, age and five comorbidity classifications.

Is systematic sextant biopsy suitable for the detection of clinically significant prostate cancer?

Background: The optimal extent of the prostate biopsy remains controversial. There is a need to avoid detection of insignificant cancer but not to miss significant and curable tumors. In alternative treatments of prostate cancer, repeated sextant biopsies are used to estimate the response.

Unusual semi-spheric perivesical calcification after pelvic radiotherapy.

An uncommon case with semi-spheric perivesical calcification after pelvic radiotherapy is reported and the possible pathogenesis of this phenomenon is discussed.