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A high accuracy laser interferometric dilatometer with a resolution of less than l nm has been developed in the National Institute of Metrology, China. This instrument is based on a single frequency polarized interferometer. The disadvantage of the single frequency procedure is that the zero may drift with time. In order to improve the stability, we developed a procedure to correct the effect of this drift, to ensure the stability of the device within 1 nm. The performance of the new device has been examined by measuring some reference materials. The Standard Reference Material 738(austenitic stainless steel) from the National Institute of Standard and Technology was measured over the temperature range from 300K to 770K. The measured linear Expansion Coefficient agreed with the values referred by NIST of the relative deviation less than 1.7% with the combined standard uncertainty at room temperature of 3.4 x 10-2(n = 2). The silicon sample was measured over the range from 770 K to 1200 K, and the measurement results were in good agreement with the recommended values by the Committee on Data for Science and Technology (CODATA). [ABSTRACT FROM AUTHOR]

Objective: To investigate the capacity of human endometrial stromal stem cells for differentiation into osteoblasts and chondroblasts and their potential as seeding cells in bone tissue engineering., Methods: Human endometrial stromal stem cells were obtained from hysterectomy tissues from 15 women during normal menstrual cycles and induced to differentiate into osteoblasts and chondroblasts. The differentiated cells were examined with cytochemistry., Results: A population of endometrial stromal stem cells was successfully isolated from human endometrial tissue and showed stable proliferation in vitro. After treatment with osteoblast and chondroblast revulsant, the endometrial stromal stem cells differentiated towards osteoblasts were verified by positive staining with alizarin red and towards chondroblasts by positive staining with Alcian blue., Conclusion: Endometrial stromal stem cells obtained from human endometrial tissue with multilineage potential can differentiate into osteoblasts and chondroblasts in vitro, and may serve as candidate autogenous seeding cells for bone tissue engineering.

Objective: To investigate the clinicopathological characteristics and differential diagnosis of primary peritoneal adenocarcinoma., Methods: The clinico-pathological data of 8 patients with primary peritoneal adenocarcinoma, all female, aged 55.7 (45 - 69), were analyzed retrospectively. Immunohistochemistry was used to detect the expression of pan-cytokine, cytokine (CK) 7, CK20, CA125, CEA, epithelial membrane antigen (EMA), vimentin, calretinin, and P63 in the specimens of tumor obtained during tumor reduction surgery. Microscopy was conducted for pathological examination., Results: The common clinical symptoms of these 8 patients included abdominal distention and ascites. Pre-operationally, 6 cases were diagnosed as with ovarian cancer, I case as with malignant mesothelioma, and I as with peritoneal carcinoma. The misdiagnosis rate was 87.5%. Post-operational pathological examination showed 7 cases of serous papillary adenocarcinoma and one case of mucinous adenocarcinoma. Immunohistochemistry showed the positive rates of the different biological markers as follows: pan-CK (8/8), CK7 (8/8), CK20 (1/8), CA125 (7/8), CEA (7/8), EMA (8/8), vimentin (1/8), calretinin (1/8), and P53 (8/8)., Conclusion: A rare malignant tumor arising from the secondary Müllerian system, primary peritoneal adenocarcinoma shares similar histopathological characters with ovary carcinoma, so is easy to be misdiagnosed. Immunohistochemical staining is helpful to the differential diagnosis.