Objective:To evaluate a new operation produre for the treatment of circular mixed hemorrhoids;not only obliterating symptom disposably,but also protecting the integrality and furthest of anal canal epithelium and padding, Treitz s Muscle,and retaining nomal functions of anus.

The　pathophysiology　and　pathoanatomy　of　DPS　were　analyzed　by　mechanicsFrom　the　films　of　defecography,four　kinds　of　coordinate　curves　of　the　upper　part　of　anal　canal　were　found　in　the　sagittal　plane　in　26　casesAccording　to　the　fundamentals　of　mechanics,the　injure　and　hypointense　of　the　connective　tissue　of　the　pelvic　floor,especially　the　anococcygeal　ligament,are　the　cause　of　Perineum　Descending.

Objective To explore the nursing approach of photodynamic therapy(PDT) of perianal/anal canal condyloma acuminatum with topical adminstration of 5-aminolevulinic acid(ALA).

Observation of human fetal esophageal epithelium with transmission electron microscope in high incidence area for esophageal cancer;

Expression of Cx43 in esophageal epithelium of early developing human embryo;

To explore the effect of human papillomavirus and tumor promoter on the tumorigenicity of esophageal epithelium,the human embryonic esophageal epithelial cells were infected with human papillomavirus(HPV)in synergy with~(60)cobalt radiation to observe their malignant transformation.