Lactic acid is the main substance produced by Lactobacillus and plays an important role in maintaining a healthy vaginal microecology. Recent studies indicates that both L- and D-chiral isomers of lactic acid can be protonated and destroy the cell membranes of pathogens, thereby inhibiting bacterial vagi-nosis- and aerobic vaginitis-related pathogens. Lactic acid also can inhibit the pathogens of sexually transmit-ted diseases such as Chlamydia trachomatis and human immunodeficiency virus. Moreover, lactic acid acts as an immunomodulator to inhibit the inflammatory responses caused by pathogenic microorganisms and as an epigenetic regulator regulating gene expression in vaginal epithelial cells. In this paper, we reviewed the pro-gress in lactic acid-mediated maintenance of a healthy vaginal microbiology in recent years for providing ref-erence for further research.

Objective To explore the effect of static progressive stretching combined with joint mobilization on dysfunction after total knee arthroplasty.Methods Fifty-six patients with knee joint dysfunction after total knee arthroplasty were randomly divided into a treatment group and a control group,each of 28.Both groups were treated with joint mobilization,while the treatment group was additionally provided with static progressive stretching for 8 weeks.Before and after the treatment,both groups' pain and knee function were evaluated using visual analogue scale (VAS) scores,the range of motion and the hospital for special surgery knee score (HSS).Results Before the treatment there were no significant differences between the two groups in any of the measurements.After the treatment,all of the measurements had improved in both groups,on average.Compared with the control group,the treatment group's average range of motion of the knee and HSS score were significantly better.Conclusion Static progressive stretches combined with joint mobilization can effectively relieve pain,expand the range of motion and improve the function of a knee joint after total knee arthroplasty.

Objective: o study the effect of cleaning treatment with hydrofluoric acid (HF) on the surface and bonding strength of IPS e.max and Vita Mark II ceramic inlays. Methods: Fifty pieces of IPS e.max and Vita Mark II ceramic inlay specimens were made separately using CAD/CAM. After uniformly bonding surfaces using 9% HF etching, they were randomly divided into an untreated control group (group A) and the following experimental groups: neutralizing powder (B group), 37% phosphoric acid (group C), ultrasonic cleaning (group D) and neutralizing powder + 37% phosphoric acid + ultrasonic cleaning (group E). Each set of 8 specimens was bonded to Variolink N resin adhesive under standard conditions. The shear adhesive strength was measured after exposure to a constant-temperature water bath at 37 ℃ for 24 h. The location of the fracture and the type of adhesion failure were recorded. The shear adhesion and the average strength of the connection were analyzed. The remaining 2 specimens were used for scanning electron microscopy (SEM) to observe the surface morphology, including the crystal structure, pore pattern, and residue. Results : The results were similar for the IPS e.max and Vita Mark II inlays. The maximum bond strength was observed in the IPS e.max ceramic inlays in group E, with an average bond strength 11.96 MPa higher than that in group A. Among the Vita Mark II porcelain inlays, the maximum bond strength was observed in group E. The average bond strength was 9.74 MPa higher than that in group A. The results of the statistical analysis were similar for the IPS e.max and Vita Mark II porcelain inlays, with significant differences in the bond strengths between groups C, D, and E and the control group (P < 0.05). There was no significant difference in the adhesive strength between groups B and A. At the same time, there was no significant difference in the bond strength between the treatment groups B, C, D, and E (P > 0.05). SEM revealed that the pores on the surface of ceramics subjected to the acid etching treatment were broadened and uniform, with less residue than observed in the control group. The effects of treatments D and E were the best. Conclusion The HF etching treatment can enhance the bonding strength of IPS e.max and Vita Mark Ⅱ ceramic inlays while leaving little residue, and the joint strength is highest when the joints are treated together.

Bladder cancer (BC) is the most common malignant tumor of the genitourinary system. The age of individuals diagnosed with BC tends to decrease in recent years. A variety of standard therapeutic options are available for the clinical management of BC, but limitations exist. It is difficult to surgically eliminate small lesions, while radiation and chemotherapy damage normal tissues, leading to severe side effects. Therefore, new approaches are required to improve the efficacy and specificity of BC treatment. Synthetic biology is a field emerging in the last decade that refers to biological elements, devices, and materials that are artificially synthesized according to users' needs. In this review, we discuss how to utilize genetic elements to regulate BC-related gene expression periodically and quantitatively to inhibit the initiation and progression of BC. In addition, the design and construction of gene circuits to distinguish cancer cells from normal cells to kill the former but spare the latter are elaborated. Then, we introduce the development of genetically modified T cells for targeted attacks on BC. Finally, synthetic nanomaterials specializing in detecting and killing BC cells are detailed. This review aims to describe the innovative details of the clinical diagnosis and treatment of BC from the perspective of synthetic biology.
Humans ; Synthetic Biology ; Urinary Bladder Neoplasms/diagnosis*