OBJECTIVETo establish an in vitro culture model of single human hair follicle, and observe their morphological and histological changes.

METHODSHuman hair follicles were isolated from the volunteer patients. After dissecting follicles into single, follicles in growth phase were cultured in Williams E without any serum. This experiment included 3 groups: single follicle without sebaceous gland and other surrounding tissue (control group); single follicle with sebaceous gland and without the other surrounding tissue( experiment group A); single follicles with sebaceous gland and the other surrounding tissue (experiment group B). The survival rate, survival time, growth rate, multiplication capacity and apoptosis of cultured follicles and their morphological and histological changes were observed sequentially.

RESULTSThe hair follicles in experiment groups showed a better viability and a higher growth rate than those in control group. And the follicles in group B could keep growing for more than 25 days, which was longer than those in group A. Moreover, the sebaceous gland and the other surrounding tissue in group B showed great induction effect on follicle-cell proliferation and anti-apoptosis.

CONCLUSIONThe in vitro culture model of signal human hair follicles (single follicles including epidermis, sebaceous gland and the other surrounding tissue) had optimized internal environment which is similar to in vivo internal environment.

Culture Techniques ; Hair Follicle ; anatomy & histology ; cytology ; growth & development ; Humans ; In Vitro Techniques ; Sebaceous Glands ; Time Factors

Objective To investigate the potential clinical prognostic factors of severe traumatic brain injury.Methods Two hundred and thirteen severe traumatic brain injury patients,admitted to our hospital from May 2013 to July 2015,were chosen in our study.Their clinical data were retrospectively analyzed;prognostic factors,including age,gender,mGCS scores (movement GCS scores),improved CT scores,brain hernia,volume of intracranial hematoma,range of cerebral contusion and laceration,and location of intracranial hematoma,were estimated using Chi square test,and after the Chi square test,the factors enjoying statistical significance were analyzed by COX proportional hazards regression model.Results The mortality rate was 15.9％ (34/213).Death occurred within 30 days of admission,and death mostly occurred within 10 days of admission (1-10 d:23 patients;11-20 d:9 patients;20-30 d:2 patients).Cox proportional hazards regression analysis indicated that age,GCS scores (movement GCS scores),improved CT scores,and brain hernia were the prognostic risk factors in patients with severe traumatic brain injury,while gender,volume of intracranial hematoma,range of cerebral contusion and laceration,and location of intracranial hematoma were not.Conclusion Age,mGCS scores (movement GCS scores),improved CT scores,and brain hernia dare important factors affecting the prognosis of patients with severe traumatic brain injury.

In this paper, the history and current situation of environmental health standardization in China are reviewed, and the experience and shortcomings in the process of environmental health standardization in China are analyzed, suggestions for the next step of environmental health standards are also put forward.

In this paper, the history and current situation of environmental health standardization in China are reviewed, and the experience and shortcomings in the process of environmental health standardization in China are analyzed, suggestions for the next step of environmental health standards are also put forward.