Evaluation of phytohormone facilitation in microalgal biomass production using mathematical modeling.

How to improve the growth efficiency of microalgae is the bottleneck of microalgae large-scale application. The addition of trace substances can promote the growth of microalgae, but there is no suitable model that can be used to predict the effects of trace substance concentrations on the growth of microalgae. In the present study, a mathematical model based on hormesis is proposed to describe the effects produced by trace substances on the biomass of microalgae and applied to assess the dose-response of four phytohormones on Scenedesmus sp.

Controllable optical rogue waves in the femtosecond regime.

We derive analytical rogue wave solutions of variable-coefficient higher-order nonlinear Schrödinger equations describing the femtosecond pulse propagation via a transformation connected with the constant-coefficient Hirota equation. Then we discuss the propagation behaviors of controllable rogue waves, including recurrence, annihilation, and sustainment in a periodic distributed fiber system and an exponential dispersion decreasing fiber. Finally, we investigate nonlinear tunneling effects for rogue waves.

Management of delayed post-pancreaticoduodenectomy arterial bleeding: interventional radiological treatment first.

Objective: To investigate the diagnosis and treatment of delayed post-pancreaticoduodenectomy arterial bleeding (DPPAB).

Methods: Records of 336 patients who underwent pancreaticoduodenectomy (PD) between January 2000 and December 2010 were retrospectively analyzed. Detailed data of patients with DPPAB were assessed by a thorough review of medical records.

[A scoring system to predict ascites after hepatectomy for hepatocellular carcinoma].

Objective: To establish a scoring system predicting the ascites postoperatively by analyzing the variant factors associated with massive ascites after hepatectomy in the patients with hepatocellular carcinoma (HCC).

Methods: From January 2005 to January 2010, 324 patients with HCC underwent hepatectomy were analyzed retrospectively. There were 282 male and 42 female, aging from 17 to 84 years (mean age, 54 years).

[Association of hepatitis B virus infection and cirrhosis with liver metastasis in colorectal cancer].

Objective: To explore the relationship of hepatitis B virus (HBV) infection and cirrhosis with liver metastasis in colorectal cancer.

Methods: Clinical date of 1176 colorectal cancer patients undergone surgical treatment in the Peking University School of Oncology between January 1999 and August 2004 were analyzed retrospectively to investigate the impact of HBV infection and cirrhosis on the occurrence of liver metastasis and prognosis of patients.

Results: The incidence of liver metastasis was 8.

Long mesentericoportal vein resection and end-to-end anastomosis without graft in pancreaticoduodenectomy.

Introduction: The feasibility and safety of pancreaticoduodenectomy (PD) combined with long segmental mesentericoportal vein (MPV; >5 cm) resection and end-to-end anastomosis without graft has rarely been demonstrated.

Materials And Methods: Eight patients with pancreatic head adenocarcinoma underwent PD combined with long MPV resection between August 2006 and May 2008 in Peking University School of Oncology.

Results: By liver mobilization and Cattell-Braasch maneuver, direct and tension-free end-to-end anastomosis was easily performed even when the resected segment of the MPV was longer than 5 cm.