Spermatogenesis is a process consisting of spermatogonial proliferation, spermatocytic meiosis, and spermiogenesis, and is also considered to be a process in which heterochromatins gradually aggregate and finally reach a highly condensed formation in the sperm head. Recent studies show that epigenetic regulation plays a key role in spermatogenesis. This review discusses the mechanisms of epigenetic regulation in spermatogenesis in three aspects, DNA methylation, histone modification, and noncoding RNAs. These factors are essential for spermatogenesis, fertilization, and embryogenesis by mutual regulation as well as by gene expression regulation, transposon activation, sex chromosome inactivation, and genome imprinting.
DNA Methylation ; Embryonic Development ; Epigenesis, Genetic ; physiology ; Genomic Imprinting ; Humans ; Male ; Meiosis ; Spermatogenesis ; genetics ; Spermatogonia ; cytology ; physiology

Cataract ; genetics ; Diabetic Retinopathy ; genetics ; Eye Diseases ; genetics ; therapy ; Genetic Therapy ; Glaucoma, Open-Angle ; genetics ; Humans ; Macular Degeneration ; genetics

Objective To discuss the expression and significance of eotaxin in the nasal secretions of the patients with nasal pol-yps .Methods The nasal secretion samples were collected from 40 patients including 15 cases of nasal polyps ,15 cases of chronic si-nusitis and 10 cases of nasal septum deviation .The enzyme-linked immunosorbent assay(ELISA) was adopted to detect the concen-tration of eotaxin .Results The average concentration of eotaxin was (468 .82 ± 440 .64)pg/mL in nasal polyps ,(443 .85 ± 334 .68) pg/mL in chronic sinusitis and (149 .23 ± 49 .01)pg/mL in nasal septum deviation .The eotaxin concentrations in the nasal polyps group and the chronic sinusitis group were higher than those in the nasal septum deviation group ,the difference was statistically significant(P<0 .05) .Conclusion The eotaxin concentration in the nasal secretions of the patients with nasal polyps is significantly increaseed ,which might be concluded that eotaxin may play an important role in the occurrence and development process of nasal polyps .

Hepatocellular carcinoma is the fifth malignant tumor in the world.Most patients who have been diagnosed have been in advanced stage,so mortality of hepatocellular carcinoma is thirdly in malignant tumor of digestive cancers.The effective tumor marks are the main method of early diagnosis or treatment and raising survival rate.This articles reviewed the several tumor marks which have been found in the past few years.

Objective To explore the relationship among personality,job burnout and knowledge sharing behavior of the enterprise employees.Methods The 44 items big five inventory(BFI) ,knowledge sharing inventory and job burnout inventory were administrated to 635 employees online.Results ( 1 ) Agreeableness had a significant main effect on knowledge sharing ( β =0.135, P＜0.01); (2)Cynicism( β = -0.140, P＜0.01) and reduced personal accomplishment( β = -0.125, P＜0.01 ) had a significant effect on knowledge sharing behavior and its two dimensions; (3) Job burnout partially mediated the relationship between agreeableness and knowledge sharing behavior(P＜0.01).Conclusion Enterprise employees' personality had different effects on knowledge sharing behavior,and job burnout was an important mediating role in the relationship above.

Objective To acquaint the condition of learning burnout of medical students and to explore the relationship of learning burnout with professional commitment and social support. Methods 610 medical students were evaluated with Learning Burnout Scale, professional commitment scale and social support scale. Results ①In general, learning burnout index of medical students was 2.84±0.49; in terms of gender difference, male students [(2.83±0.65) and (3.08±0.61)] were higher than females[(2.70±0.63) and (2.96±0.60)] at the level of emotional turndown and behavioral unsuitableness, the difference was statistically significant( P <0.05); in terms of grades, medical students'learning burnout of different grades was significant( F =4.244,P <0.01); there was no difference in profession. ②Learning burnout was significantly negative correlation with professional commitment and social support( P <0.01). ③Multiple regression analysis showed that affective commitment and family support had significant predications on learning burnout of medical students( P <0.01). Conclusion Medical students'learning burnout level is comparatively high, learning burnout closely relates to professional commitment and social support.

group A)(P0.05).In all the 3 groups,the BIS decreased to the lowest level at T2,and then increased at T3 and T4,and the BISs at T2,T3,and T4 were significantly different from that at T1(P

Lung transplantation is the unique method to cure pulmonary tuberculosis at final stage. This paper reviewed the history, indication and contraindication, method of donor and recipient selection and donor preservation, operation methods, postoperative complications and protocol for complications to well understand issues in lung transplantation. Moreover, lacking of donors and increasing mortality of patients waiting for transplantation are urgent problems. With technique development, prognosis amendment, and improvement of survival rate and quality of life, donor source becomes important. Many studies have been conducted to explore the application of cadaveric lung, and several animal trials have been successful. In addition, scope of in vivo pulmonary lobes transplantation is increasing. Based on split liver transplantation, split double-lung transplantation is developed. This method utilizes existed donor sources, and provides options for patients waiting for transplantation.

MicroRNAs (miRNAs) are small non-coding RNAs which are essential for posttranscriptional gene regulation and have important roles in physiology and pathology. The researches on function of miRNA will be a focus in the future. Several animal models have been built by transgenic technology, making important contributions to our understanding of gene function at the whole scale. Recently, the number of transgenic animal models for microRNAs and construction strategies have been increasing and diversifying. Some roles of miRNA in tumor and cardiovascular disease have been revealed by transgenic animals. Transgenic animals are becoming a kind of powerful tool in microRNA researches.

TLC was used for the qualitative identification of Magnolia officinalis Rehd. et wils, Cyperus rotundus L.and Rheum palmatum L. in Shixiangzhitong pill. The content of chrysophanol in Shixangzhitong pill was assayed by TLC-scanning. The proposed method can be used to control the quality of Shixiangzhitong pill.