transition cell
2.G1/S transition of cell cycle is regulated by G1 cyclins/cyclin-dependentkinases (CDKs ) and their inhibitors. Cyclin D1/CDK4 complex phosphorylatesretinoblastoma (pRB) gene product and P16 inhibits CDK4 in competition with cyclin D1.Aberrant expression of these proteins may deregulate cell proliferation and moreovermay lead to tumor formation and progression.
3.The property of Freedericksz transition and the bistable state for nematic liquid crystal (NLC) cell in the surface physics of liquid crystal (LC) have been one hot point of current LC science.
4.During the cell cycle, successful accomplishment of G_2/M transition is a pivotal process to carry out proliferation.
5.Presently, the major materials that have been used as cathode were layered LiCoO_2, LiNiO_2 with α-NaFeO_2 structure and LiMn_2O_4 with spinel structure. Among these lithiated transition metal oxides, because of its abundant resources, low cost, high cell voltage and environmental friendliness, spinel LiMn_2O_4 was considered to be the most promising material.
6.Cyclin, cyclin -dependent ki-nase ( CDK) , and cyclin - dependent kinase inhibitor ( CKI) form a regulating network to coordinate normal cell cycle transition.
7.Basal cell hyperplasia is usually seen in the transition zone. Occasionally, it may be encountered in needle biopsies (which sample peripheral zone).
8.However, cell cycle is negatively regulated by cyclin-dependent kinase inhibitor (CDKI) such as p27. p27 can bind to and inhibit the activity of cyclin-dependent kinases(CDK) thereby prevent cell cycle progression of late GI to S-phase transition.
9.Abnormally high concentration of Ca2+ and oxide stress can stimulate the opening of the mitochondriapermeability transition pore (MPTP) and cause the change of mitochondria shape and function. The factorsreleased by mitochondria, such as cytochrome c and AIF (apoptosis-inducing factor) involve in the signalingpathway of caspases and induce cell apoptosis.
10.Histological type: of the 25 cases, 14 were endometrioid carcinomas, 2 were clear cell carcinomas, 2 were adenoacanthoma, 1 was serous papillary adenocarcinomas, 6 were mixed epithelium tumor of ovary. The exact area of histologic transition from benign to malignant epithelium was observed in 25 patients.
