ABSTRACT
Objective@#To detect the presence of HPV associated antibodies in the serum of patients diagnosed with esophageal cancer in Chaoshan region and to provide data that could possibly be used as reference for the monitoring of patients with esophageal cancer.@*Methods@#The pSecTag recombinant vectors containing the HPV16 E6/E7 and HPV18 E6/E7 genes were constructed respectively to express HPV16 E6/E7 and HPV18 E6/E7 fusion proteins in 293 cell line after transfecting the cell line. Immunoenzymatic method was employed with the fusion proteins as antigen to detect IgG antibody against HPV in serum of 76 esophageal cancer patients and 149 normal persons undergoing health checkup. In addition, the same sera were assessed by enzyme-linked immunosorbent assay (ELISA) method using L1 as antigen.@*Results@#Only one esophageal cancer patient’s serum presented as positive for IgG by immunoenzyme technique when E6/E7 was used as antigen. However, when the L1 was used as antigen in ELISA assay, 37 of the 76 cases of esophageal cancer patients (48.7%) were HPV antibody-positive. Among the 149 health checkup persons, 79 (53.0%) were HPV antibody-positive. No significant difference was found between the two groups (P>0.05).@*Conclusion@#HPV related antibodies in the serum remain inapplicable as a screening tool for serological detection of esophageal cancer. Further research is needed to understand the role and diagnostic applications of HPV infection in esophageal cancer.
ABSTRACT
Sarcophagus beetles, which can not be replaced by Diptera, play a pivotal role not only in estimating PMI of dry human skeletal remains in the later stages decomposition of carcasses, but also the corruption, destruction, decomposition and posture changes of carcasses. This article explicates the succession of sarcophagus beetles on carrion and its influencing factors, and introduces the application and prospects of sarcophagus beetles in forensic entomology. Although few researches focus on sarcophagus beetles at present, it is believed that more and more forensic scientists will pay attention to sarcophagus beetles' application in forensic identification.
Subject(s)
Animals , Humans , Coleoptera/growth & development , Entomology/methods , Feeding Behavior , Forensic Medicine/methods , Larva/growth & development , Life Cycle Stages , Postmortem Changes , Temperature , Time FactorsABSTRACT
Photoautotrophic gametophyte cells of the brown macroalgae Laminaria japonica were cultivated in 500ml stirred tank photobioreactors under seven pulse feeding modes and one batch mode.It is the first time for the study of effects of the feeding time points and feeding quantity on macroalgal cell growth and nutrient consumption.Results showed that, with inoculum density of 50mg DCW/L, in modified APSW artificial seawater medium at 13℃, light intensity of 60μE/m2.s, light cycle of 16/8h L/D, aeration rate of 50ml/min, and agitation speed of 100r/min, feeding the culture with small nutrient quantity was beneficial for the synchronization between nitrate and phosphate absorption, and further for biomass production.Feeding when ambient nutrient was abundant or depleted was quite weak for large amount of biomass accumulation, which might be due to the slowing nutrient absorption, nutrient storage, or the divergence absorption between nitrate and phosphate.Feeding nutrient frequently with small quantity from mid-exponential growth of macroalgal cells, that is maintaining medium nutrient concentration between 1/3 and 1/2 of its initial concentration, was the most effective way for biomass production, with biomass increased by 12.270 times of for 51 days' cultivation.
ABSTRACT
Photoautotrophic gametophyte cells of the brown macroalgae Laminaria japonica were cultivated in 500ml stirred tank photobioreactors under seven pulse feeding modes and one batch mode.It is the first time for the study of effects of the feeding time points and feeding quantity on macroalgal cell growth and nutrient consumption.Results showed that, with inoculum density of 50mg DCW/L, in modified APSW artificial seawater medium at 13℃, light intensity of 60μE/m2.s, light cycle of 16/8h L/D, aeration rate of 50ml/min, and agitation speed of 100r/min, feeding the culture with small nutrient quantity was beneficial for the synchronization between nitrate and phosphate absorption, and further for biomass production.Feeding when ambient nutrient was abundant or depleted was quite weak for large amount of biomass accumulation, which might be due to the slowing nutrient absorption, nutrient storage, or the divergence absorption between nitrate and phosphate.Feeding nutrient frequently with small quantity from mid-exponential growth of macroalgal cells, that is maintaining medium nutrient concentration between 1/3 and 1/2 of its initial concentration, was the most effective way for biomass production, with biomass increased by 12.270 times of for 51 days' cultivation.
ABSTRACT
Laminaria japonica gametophytic cells were cultivated in a photobioreactor under continuous shear stress (0-1000 r/min) in 60 hours and the following static cultivation within 23.5 days. The content of chlorophyll a reached the maximum value of 2.36 mg/L at the end of continuous shear stress when the agitation speed was 90 r/min, while the chlorophyll a (chl a) concentration decreased quickly and nitrogen and phosphorus were released under high shear force (270-1000 r/min). The cell injury ratio at 1000r/min was as 18 times as that of the control. During the recovery course, gametophytic cells showed themselves distinct recovery capability at all agitation speeds. Furthermore, the content of chl a is a more exact index as biomass than dry cells weight (DCW). Besides cell injury ratio, the liberation of phosphorus demonstrates the cells injury.