AIM: To investigate the putative role of human papillomavirus (HPV) infection in the carcinogenesis of esophageal squamous cell carcinoma in China.METHODS: Twenty-three esophageal squamous cell carcinoma samples and t...AIM: To investigate the putative role of human papillomavirus (HPV) infection in the carcinogenesis of esophageal squamous cell carcinoma in China.METHODS: Twenty-three esophageal squamous cell carcinoma samples and the distal normal epithelium from Shanxi Province, and 25 more esophageal squamous cell carcinoma samples from Anyang city, two areas with a high incidence of esophageal cancer in China, were detected for the existence of HPV-16 DNA by PCR, mRNA in situ hybridization (ISH) and immunohistochemistry (IHC) targeting HPV-16 E6 gene.
RESULTS: There were approximately 64 % (31/48) patients having HPV-16 DNA in tumor samples, among them nearly twothirds (19/31) samples were detected with mRNA expression of HPV-16 E6. However, in the normal esophageal epithelium from cancer patients, the DNA and mRNA of HPV-16 were found with much less rate: 34.7 % (8/23) and 26.1% (6/23) respectively.In addition, at protein level detected by IHC assay, 27.1% (13/48) tumor samples had virus oncoprotein E6 expression, while only one case of normal epithelium was found positive.CONCLUSION: HPV infection, especially type 16, should be considered as a risk factor for esophageal malignancies in China.展开更多
The effects of low-Co AB_5 type hydrogen storage alloys prepared by quenchingand annealing on the performances of MH-Ni batteries were investigated, and the characteristics ofthe low-Co AB_5 type hydrogen storage allo...The effects of low-Co AB_5 type hydrogen storage alloys prepared by quenchingand annealing on the performances of MH-Ni batteries were investigated, and the characteristics ofthe low-Co AB_5 type hydrogen storage alloys were compared with those of the high-Co AB_5 typehydrogen storage alloy as well. The results showed that the faster the cooling of the low-Cohydrogen storage alloy is, the better homogeneity of the chemical composition for the alloy and thelonger cycle life of the battery are, but the electrochemical discharge capacity and high-ratedischarge ability are reduced. The high-rate discharge ability and charge retention of MH-Nibatteries for the conventional as-cast annealed low-Co hydrogen storage alloy were superior to thosefor the rapidly quenched low-Co hydrogen storage alloy and the high-Co hydrogen storage alloy, buta little inferior in the cycle life.展开更多
AIM: To investigate the expression of 1A6 gene in the lesionsduring the development of intestinal gastric carcinoma.METHODS: One hundred and thirty-six cases of intestinalmetaplasia (IM) from surgical resections and b...AIM: To investigate the expression of 1A6 gene in the lesionsduring the development of intestinal gastric carcinoma.METHODS: One hundred and thirty-six cases of intestinalmetaplasia (IM) from surgical resections and biopsy wereclassified by mucous staining. Expression of 1A6 in all caseswas detected using immunohistochemical S-P method.RESULTS: The positive rates of 1A6in normal and superficialgastritis (SG), severe atrophic gastritis (SAG), type Ⅰ, Ⅱ, ⅢIM, dysplasia (Dys) and intestinal gastric carcinoma (IGC)were 12.2 %, 16.7 %, 7.1%, 22.6 %, 47.8 %, 46.9 % and60.8 %, respectively. A significant difference among typeⅢ IM and SG, SAG, type I and Ⅱ IM was found (P＜0.01),the difference between type Ⅲ and Dys, IGC being notsignificant.CONCLUSION: As a new tumor-related gene, expression of1A6 may be an effective parameter to predict the malignanttransformation of precancerous lesion to gastric carcinoma.展开更多
Pressure wave propagation along a pipe attached with an activepressure-controlling system at an end was described by an unsteady state-changing motion of thepressure wave fronts, in order to study the interaction amon...Pressure wave propagation along a pipe attached with an activepressure-controlling system at an end was described by an unsteady state-changing motion of thepressure wave fronts, in order to study the interaction among successive waves caused by successivecontrolling spillovers with the consideration of liquid compressibility due to high head. A modelfor water hammer propagation was established by using the continuity, momentum, and energyequations. The influence of the wave interactions on the pressure suppression was analyzed. Testingverifications were conducted with a 2575m length and 776m head penstock in hydro-power station. Thecomputed results are in good agrement with the tested ones.展开更多
基金grants from the National Natural Science Foundation of China,No.39925020State Key Basic Research Program,No.G 1998051204
文摘AIM: To investigate the putative role of human papillomavirus (HPV) infection in the carcinogenesis of esophageal squamous cell carcinoma in China.METHODS: Twenty-three esophageal squamous cell carcinoma samples and the distal normal epithelium from Shanxi Province, and 25 more esophageal squamous cell carcinoma samples from Anyang city, two areas with a high incidence of esophageal cancer in China, were detected for the existence of HPV-16 DNA by PCR, mRNA in situ hybridization (ISH) and immunohistochemistry (IHC) targeting HPV-16 E6 gene.
RESULTS: There were approximately 64 % (31/48) patients having HPV-16 DNA in tumor samples, among them nearly twothirds (19/31) samples were detected with mRNA expression of HPV-16 E6. However, in the normal esophageal epithelium from cancer patients, the DNA and mRNA of HPV-16 were found with much less rate: 34.7 % (8/23) and 26.1% (6/23) respectively.In addition, at protein level detected by IHC assay, 27.1% (13/48) tumor samples had virus oncoprotein E6 expression, while only one case of normal epithelium was found positive.CONCLUSION: HPV infection, especially type 16, should be considered as a risk factor for esophageal malignancies in China.
文摘The effects of low-Co AB_5 type hydrogen storage alloys prepared by quenchingand annealing on the performances of MH-Ni batteries were investigated, and the characteristics ofthe low-Co AB_5 type hydrogen storage alloys were compared with those of the high-Co AB_5 typehydrogen storage alloy as well. The results showed that the faster the cooling of the low-Cohydrogen storage alloy is, the better homogeneity of the chemical composition for the alloy and thelonger cycle life of the battery are, but the electrochemical discharge capacity and high-ratedischarge ability are reduced. The high-rate discharge ability and charge retention of MH-Nibatteries for the conventional as-cast annealed low-Co hydrogen storage alloy were superior to thosefor the rapidly quenched low-Co hydrogen storage alloy and the high-Co hydrogen storage alloy, buta little inferior in the cycle life.
基金National Key Fundamental Research 973 Project, No 1998051203National High Technology Research and Development Program of China(863 Program),No2001AA221121
文摘AIM: To investigate the expression of 1A6 gene in the lesionsduring the development of intestinal gastric carcinoma.METHODS: One hundred and thirty-six cases of intestinalmetaplasia (IM) from surgical resections and biopsy wereclassified by mucous staining. Expression of 1A6 in all caseswas detected using immunohistochemical S-P method.RESULTS: The positive rates of 1A6in normal and superficialgastritis (SG), severe atrophic gastritis (SAG), type Ⅰ, Ⅱ, ⅢIM, dysplasia (Dys) and intestinal gastric carcinoma (IGC)were 12.2 %, 16.7 %, 7.1%, 22.6 %, 47.8 %, 46.9 % and60.8 %, respectively. A significant difference among typeⅢ IM and SG, SAG, type I and Ⅱ IM was found (P＜0.01),the difference between type Ⅲ and Dys, IGC being notsignificant.CONCLUSION: As a new tumor-related gene, expression of1A6 may be an effective parameter to predict the malignanttransformation of precancerous lesion to gastric carcinoma.
文摘Pressure wave propagation along a pipe attached with an activepressure-controlling system at an end was described by an unsteady state-changing motion of thepressure wave fronts, in order to study the interaction among successive waves caused by successivecontrolling spillovers with the consideration of liquid compressibility due to high head. A modelfor water hammer propagation was established by using the continuity, momentum, and energyequations. The influence of the wave interactions on the pressure suppression was analyzed. Testingverifications were conducted with a 2575m length and 776m head penstock in hydro-power station. Thecomputed results are in good agrement with the tested ones.
