Neutralizing antibodies have been designed to specifically target and bind to the receptor binding domain (RBD) of spike (S) protein to block severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus from attaching to angiotensin converting enzyme 2 (ACE2). This study reports a distinctive nanobody, designated as VHH21, that directly catalyzes the S-trimer into an irreversible transition state through postfusion conformational changes. Derived from camels immunized with multiple antigens, a set of nanobodies with high affinity for the S1 protein displays abilities to neutralize pseudovirion infections with a broad resistance to variants of concern of SARS-CoV-2, including SARS-CoV and BatRaTG13. Importantly, a super-resolution screening and analysis platform based on visual fluorescence probes was designed and applied to monitor single proteins and protein subunits. A spontaneously occurring dimeric form of VHH21 was obtained to rapidly destroy the S-trimer. Structural analysis via cryogenic electron microscopy revealed that VHH21 targets specific conserved epitopes on the S protein, distinct from the ACE2 binding site on the RBD, which destabilizes the fusion process. This research highlights the potential of VHH21 as an abzyme-like nanobody (nanoabzyme) possessing broad-spectrum binding capabilities and highly effective anti-viral properties and offers a promising strategy for combating coronavirus outbreaks.
Single-Domain Antibodies/immunology* ; Spike Glycoprotein, Coronavirus/metabolism* ; SARS-CoV-2/immunology* ; Animals ; Humans ; Antibodies, Neutralizing/immunology* ; Camelus ; COVID-19/immunology* ; Antibodies, Viral/immunology* ; Angiotensin-Converting Enzyme 2

Objective:To explore the effectiveness of the"full-chain"integrated medical and elderly care service model in addressing key issues in medical-nursing services such as weak medical support capacity and insufficient provision of community-and home-based medical-nursing services.Methods:The development pathway for the"full-chain"integrated medical-elderly care service standardization system,encompassing core components such as operational mechanisms,smart platforms,policy documents,and quality control systems was systematically outlined.Effectiveness based on dimensions including service coverage,quality improvement,talent development,and social benefits was evaluated.With standardization as the core driver,the'1234567'management model was innovatively implemented.Results:The model leveraged the downward allocation of high-quality resources from tertiary general hospitals to strengthen subdistrict community health service centers.By collaborating with subdistrict elderly-care service centers,it established"subdistrict medical-elderly care and wellness service centers".These centers enhanced the capabilities of"community-embedded elderly-care complexes",including community daytime care centers,established two-way referral channels between medical and elderly care services,aligned with healthcare demands to provide elderly individuals with reliable medical support.It reduced the burden on families and society,stimulated market vitality,boosted domestic demand,promoted the development of integrated medical-elderly care and wellness initiatives,thereby advancing the silver economy.With provincial government endorsement,the model had been applied to 203 communities across 37 counties by the end of 2024.Conclusion:The established"full-chain"integrated medical-elderly care service model facilitates regional high-quality development in integrated care by consolidating healthcare group resources and seamlessly connecting the service chain across hospitals,nursing homes,community institutions,and home-based settings,thereby creating a practical paradigm for comprehensive elderly care service delivery.

Objective:To build an experimental curriculum system of Oral Preventive Medicine with the goal of improving the job competence of oral medical students.Methods:By establishing knowledge modules, adjusting the experimental content, integrating teaching methods, and improving the comprehensive assessment system of teaching, the teaching reform is carried out in the experimental teaching of Oral Preventive Medicine for undergraduates from 2016 to 2017 in the Department of Stomatology at Zhuhai Campus of Zunyi Medical University.Results:The experimental curriculum system and teaching evaluation system of Oral Preventive Medicine with the goal of improving the job competence of medical students have been established. Cultivate students' independent learning ability and innovative and practical spirit, guide undergraduates to participate in social services, enhance the sense of social responsibility, and integrate theoretical education, ability training and quality education.Conclusions:Explore the new model of experimental oral medicine teaching, initially build the experimental curriculum system of Oral Preventive Medicine with the goal of job competence, promote the transformation of undergraduate teaching concept, deepen the connotation of teaching, and improve the depth and breadth of the teaching of Oral Preventive Medicine.

Objective:To explore the effectiveness of the"full-chain"integrated medical and elderly care service model in addressing key issues in medical-nursing services such as weak medical support capacity and insufficient provision of community-and home-based medical-nursing services.Methods:The development pathway for the"full-chain"integrated medical-elderly care service standardization system,encompassing core components such as operational mechanisms,smart platforms,policy documents,and quality control systems was systematically outlined.Effectiveness based on dimensions including service coverage,quality improvement,talent development,and social benefits was evaluated.With standardization as the core driver,the'1234567'management model was innovatively implemented.Results:The model leveraged the downward allocation of high-quality resources from tertiary general hospitals to strengthen subdistrict community health service centers.By collaborating with subdistrict elderly-care service centers,it established"subdistrict medical-elderly care and wellness service centers".These centers enhanced the capabilities of"community-embedded elderly-care complexes",including community daytime care centers,established two-way referral channels between medical and elderly care services,aligned with healthcare demands to provide elderly individuals with reliable medical support.It reduced the burden on families and society,stimulated market vitality,boosted domestic demand,promoted the development of integrated medical-elderly care and wellness initiatives,thereby advancing the silver economy.With provincial government endorsement,the model had been applied to 203 communities across 37 counties by the end of 2024.Conclusion:The established"full-chain"integrated medical-elderly care service model facilitates regional high-quality development in integrated care by consolidating healthcare group resources and seamlessly connecting the service chain across hospitals,nursing homes,community institutions,and home-based settings,thereby creating a practical paradigm for comprehensive elderly care service delivery.

Objective:To build an experimental curriculum system of Oral Preventive Medicine with the goal of improving the job competence of oral medical students.Methods:By establishing knowledge modules, adjusting the experimental content, integrating teaching methods, and improving the comprehensive assessment system of teaching, the teaching reform is carried out in the experimental teaching of Oral Preventive Medicine for undergraduates from 2016 to 2017 in the Department of Stomatology at Zhuhai Campus of Zunyi Medical University.Results:The experimental curriculum system and teaching evaluation system of Oral Preventive Medicine with the goal of improving the job competence of medical students have been established. Cultivate students' independent learning ability and innovative and practical spirit, guide undergraduates to participate in social services, enhance the sense of social responsibility, and integrate theoretical education, ability training and quality education.Conclusions:Explore the new model of experimental oral medicine teaching, initially build the experimental curriculum system of Oral Preventive Medicine with the goal of job competence, promote the transformation of undergraduate teaching concept, deepen the connotation of teaching, and improve the depth and breadth of the teaching of Oral Preventive Medicine.

Objective:To summarize the clinical features of out-of-hospital extracorporeal cardiopulmonary resuscitation(ECPR) patients and analyze the factors associated with discharge survival.Methods:The data of 54 patients with ECPR in the Emergency Center of the Second Hospital Affiliated to Zhejiang University School of Medicine from January 2020 to December 2023 were analyzed. Patients were divided into the survival group and death group based on their survival status within 30 days of discharge. Kaplan Meier method was used to draw the survival curve, and COX regression analysis was used to analyze the relevant factors of survival.Results:(1) A total of 54 patients with ECPR were included in this study. 17 (31.5%) cases were discharged alive, of which 10 (58.8%) had a good neurological prognosis, while 37 case (68.5%) died.(2) Kaplan-Meier survival analysis showed that patients who received first-witness CPR, had a lower-extremity perfusion line established, underwent IABP, achieved ROSC, had normal pH, and had an initial pupillary light reflex had a longer median survival time ( P < 0.05). (3) Univariate COX regression analysis showed that statistically differences in survival time among patients with ECMO times, hypoperfusion times, initial pupil sizes, and APACHEⅡ scores ( P < 0.05); (4) Multivariate COX regression analysis showed that APACHEⅡ score, initial pupil size, and IABP were independent predictors of survival of patients discharged from the hospital with emergency ECPR; (5) The concordance index of the COX regression model was 0.921. Conclusions:The survival model demonstrates good predictive accuracy. Healthcare professionals can use the APACHEⅡscore and initial pupil size on admission as important reference indicators to assist in determining patient prognosis, and to timely initiate IABP treatment, in conjunction with the patient’s condition, to improve the survival rate of patients discharged from the hospital.

Ghrelin and motilin (MTL) are mainly secreted by digestive tract,and they both can promote gastrointestinal motility. Disorder of gastrointestinal motility (DGIM)is a gastrointestinal motility or sensory disease mainly caused by neuroregulatory disorder,its main symptoms are nausea,vomiting,abdominal pain and abdominal distension. More and more studies have indicated that ghrelin,MTL and their receptor agonists are closely related to DGIM. This article reviewed the advances in studies on relationship between ghrelin/ GHS-R agonist,MTL/ MTL-R agonist and DGIM.

Objective:To investigate the application and feasibility of the night-vision puncture technique in performing peripherally inserted central catheter(PICC).Methods:Seventy patients were randomly divided into ultrasound guided puncture group or modified blind puncture group,35 cases in each group.The puncture success rate,the achievement ratio of catheterization,the puncture site,arm circumference,catheterization time and complications were recorded in two groups.Results:Two groups had no significant difference in the puncture success rate,the achievement ratio of catheterization,the puncture site,arm circumference,phlebitis incidence,subcutaneous congestion (bleeding) (P ＞ 0.05).The catheterization time in modified blind puncture group was shorter than the ultrasound guided puncture group (P ＜ 0.001).In modified blind puncture group,a negative correlation (correlation coefficient:-0.475,P =0.004)between arm circumference and the puncture success rate was found.Conclusion:The puncture success rate of the modified blind puncture technique in performing peripherally inserted central catheter (PICC) is high and close to the puncture success rate of the PICC under ultrasound.Additionally,the modified blind puncture technique does not increase the incidence of complications and delay the catheter time.

Objective To observe the clinical efficacy of electroacupuncture at cervical Jiaji (EX-B2) points plus behavioral intervention in treating cervical spondylosis. Method The cervical spondylosis patients were randomized into two groups at a ratio of 3:1, 90 cases in the electroacupuncture group and 30 cases in the medication group. The patients who received electroacupuncture were also given cupping and behavioral intervention (raising head for 1 min every 20-30 min and correcting sleep habits). The clinical efficacy was evaluated according to the symptoms and body signs assessment scale. Result Respectively after 4-week, 8-week, 4-month and 6-month treatments, the clinical control rate, markedly control rate and total effective rate in the electroacupuncture group were significantly higher than that in the medication group. Conclusion Electroacupuncture at Jiaji points plus behavioral intervention is an effective solution to prevent and treat cervical spondylosis.

Objective This experiment aimed to study the influence of deep sea water (DSW) on wound healing of mice .Methods 24 Mice were randomly divided into two groups :group DSW(n=12) and group sterilize tap water(STW)(n=12) ,freely feeding for 14 days respectively ,and calculated the amount of food and water .On the 15th day ,1 cm × 1 cm size of wound was established on the back area of mice ,and continued to feed with DSW and STW respectively .Tracking the wound healing rate .Specimen was taken in the edge of wound tissue on postoperative 3 ,5 ,7 days ,then observed histopathological changes .Results Compared group DSW with group STW ,there was no significant difference in the total amount of food and water .5 days after the formation of wounds ,the wound healing rate of group DSW was significantly higher than group STW .Histological observation :compared with group STW ,vascular endothelial cells and new capillaries of the group DSW was increased ,and group DSW had less inflammatory cell and more fibroblast cells proliferation .Conclusion deep sea water can promote wound healing .