Transcranial Doppler can detect the presence of microembolic signal in patients at high risk of stroke as well as in invasive cardiovascular examinations and surgical procedure.A growing number of evidence has suggested that cerebral microemboli may cause cognitive impairment.This article reviews the effects of cerebral microemboli on cognitive function.

Total saponins in crude drug and induced callus of Gynostemma pentaphyllum (Thunb. )Mak. grown in Jiangxi Province were analysed by spectrophotometry and TLC. Results sh-owed that the quality and quantity of saponins in crude drugs valicd collsiderably with cu-lture area, the life cycle and their crgans. The quality and quantity of saponins in callusalso varied due to source of clone. It providcd some cvidence for the production and harv-est of G. pentaphyllum.

Cisplatin, an efficient anticancer agent, can trigger multiple apoptotic pathways in cancer cell. However, the signal transduction pathways in response to cisplatin-based chemotherapy are complicated, and the mechanism is not fully understood. Using fluorescence resonance energy transfer (FRET) technique, the molecular mechanism of cisplatin-induced apoptosis in living human lung adenocarcinoma cells (ASTC-a-1) were investigated. After cisplatin treatment, the recombinant pFRET-Bid and pSCAT-3 probes were used to determine the kinetics of Bid cleavage and Caspase-3 activation, respectively. The fluorescence probes Bid-CFP and DsRed-Mit were also used to detect the spatial and temporal changes of Bid in real-time in sub-cell level. The results showed that a cleavage of the Bid-FRET probe occurring at about 4～5 h after treated with 20 ?mol/L cisplatin. Cleavage of the Bid-FRET probe coincided with a translocation of tBid from the cytosolic to the mitochondria, and the translocation lasted about 1.5 h. At the anaphase of cell apoptosis, Caspase-3 was activated obviously as detected by FRET and Western blotting techniques. Using real-time single-cell analysis, it was observed the kinetics of Bid and Caspase-3 activation for the first time in living cells during cisplatin-induced apoptosis.

Object To study the callus culture of Gynura segetum (Lour.) Merr., so as to lay the foundation for the rapid propagation of its breeds.Methods The explants used in culture were root, stem and leaf of G. segerum. The MS basal medium containing different plant hormones was applied. Results The best explants were leaf of G. segetum. The medium induced callus was MS basal medium containing 1 0 mg/L NAA and 4 0 mg/L 6 BA and the callus induction rate was 64% . The sprouting rate of the callus transplanted to fitting differential medium was 86 7%.Conclusion The rapid propagation of G. segetum can be carried out by inducing callus of the plant.

Objective To investigate the effects of controlled low central venous pressure (CLCVP) on cerebral oxygen metabolism during orthotopic liver transplantation (OLT),and study the safety of CLCVP in OLT.Method Forty-six patients subject to OLT were randomly divided into CLCVP group (CL group) and CVP group (C group).Blood samples were taken from radial artery and jugular simultaneously for blood gas analysis before operation (T1,baseline),immediately blocking inferior vena and portal vein (T2),30 min after anhepatic phase (T3),30 min after graft reperfusion (T4),2 h after graft reperfusion (T5),and 24 h after graft reperfusion (T6).Cerebral arterial oxygen content (CaO2),jugular oxygen content (CjvO2),cerebral arterial-venous oxygen content difference (Ca-jvO2),cerebral oxygen extraction rate (CERO2),and cerebral blood flow/ cerebral metabolic rate of oxygen (CBF/CMRO2) were calculated by the Fick formulae.Meanwhile,blood samples were taken from jugular simultaneously for serum creatinine (Cr) and urea nitrogen (BUN) a different time points.We also recorded the whole operation time,anhepatic phase time,volume of blood loss and transfusion,and urine volume.Results As compared with C group,CaO2,CjvO2,Ca-jvO2,SjvO2,CERO2 and CBF/CMRO2 in CL group were nearly not changed at different time pioints (P＞0.05),but in the same group,as compared with T1 and T2,the CaO2,CjvO2,Ca-jvO2 and CERO2 in T3,T4 and T5 were decreased significantly (P＜0.05),and the SjvO2 in T3,T4 and T5 was increased remarkably.The operation time and anhepatic phase time had no significant difference in both groups.As compared with C group,the volume of blood loss and transfusion in CL group were decreased (P＜0.05),and the urine volume in CL group CL was increased significantly (P＜0.05).Cr and BUN showed no significant difference in both groups and at the same time points of C group and CL group.Conclusion CLCVP can decrease volume of blood loss and transfusion,increase urine volume during OLT,and it does not change the cerebral oxygen metabolism during OLT.

BACKGROUND:Nowadays,posterior cruciate ligament injury caused by a sports injury or vehicle injury is more common than people think.Posterior cruciate ligament reconstruction is one of the main treatment methods,but there are still a lot of controversies about the surgical method and ligament selection of posterior cruciate ligament reconstruction. OBJECTIVE:To comprehensively analyze the global application trend of posterior cruciate ligament reconstruction and identify promising research hotspots of posterior cruciate ligament reconstruction based on bibliometrics and visual analysis. METHODS:Publications(articles and reviews)related to posterior cruciate ligament reconstruction from 2000 to 2022 were retrieved from the Web of Science(WOS).The country,institution,publication year,author,journal,average citations per item,H index,title,keywords of publication,and the top 25 cited articles were extracted and analyzed in detail.The VOSviewer/citespace/Pajek software was used to analyze the co-occurrence result of keywords to predict the hotspots of posterior cruciate ligament reconstruction. RESULTS AND CONCLUSION:A total of 664 articles were included.(1)In the past 22 years,the number of posterior cruciate ligament reconstruction articles has shown an increasing trend in general.The top 3 countries(the USA,China,and South Korea)accounted for 65.51%of all articles published.The USA has the largest number of publications.The University of Pittsburgh is the largest contributor.Knee Surgery Sports Traumatol Arthrosc and American Journal of Sports Medicine are the most influential journals.Laprade,Robert F.is the professor who has published the most articles in the field of posterior cruciate ligament reconstruction,and Fanelli,GC is the professor who has the highest total chain strength in the field of posterior cruciate ligament reconstruction.(2)The research direction can be divided into the following five clusters:"posterior cruciate ligament anatomical and biomechanical studies","posterior cruciate ligament reconstruction prognosis,outcome,and complications","posterior cruciate ligament reconstruction surgical method and tendon selection","surgical technique",and"posterior cruciate ligament tear combined with multiple ligament injury".(3)It is concluded that in terms of the trend of previous years,an increasing number of articles related to posterior cruciate ligament reconstruction will be published in the future.The USA is a world leader in the field of posterior cruciate ligament reconstruction.China and South Korea presented great potential in this area.Anatomical and biomechanical research of posterior cruciate ligament and posterior cruciate ligament reconstruction methods and the selection of tendons may be the future hotspots in the field of posterior cruciate ligament reconstruction.