After the digital resources in 8 famous domestic medical academic libraries were investigated, the status quo and characteristics of digital resources development and the use of different social networking tools in these libraries were analyzed, the crowd-sourcing concept was used to guide the users to participate in the development of digital resources using the social networking tools, and a platform for users participating in information organization and integration was constructed by making use of mobile communication/WeChat.

9β,11β-Epoxypregn-4-ene-17α,21-diol-3,20-dione 21-acetate (Ⅰ) is a substrate for the production of 9β,11β-Epoxypregn-1,4-diene-17α,21-diol-3,20-dione (Ⅳ),which is a key precursor for the production of many 9-fluoro-substituted corticosteroid hormones.By comparing whole cells catalysis and cellular lysates conversion,it was found that whole cells of Mycobacterium sp.MS136 could only convert Ⅰ to 9β,11β-Epoxypregn-4-ene-17α,21-diol-3,20-dione (Ⅱ),and Ⅰ can be effectively converted toⅣ by cellular lysates.The reaction order is that Ⅰ is spontaneously hydrolyzed to Ⅱ and Ⅱ undergoes C1,2-dehydrogenation reaction to Ⅳ.In order to improve the productivity of Ⅳ,the key genes kstD,kstD3 and kstDM encoding C1,2-dehydrogenase (KSTD) were overexpressed in Mycobacterium sp.MS136 to enhance the C1,2-dehydrogenation reaction rate,and the results showed that 1 g/L substrate Ⅰ can be converted by recombinant strain MS136-kstDM cellular lysates at pH 7.0,the productivity of Ⅳ reached 78.4％ after 45 h,which is 38.9％ higher than original strain.The reaction rate is enhanced by optimizing the pH,and the results showed that 1 g/L substrate (Ⅰ) can be converted by recombinant strain MS136-kstDM cellular lysates at pH 7.5,the productivity of Ⅳreached 92.8％ after 45 h,which was 63.4％ higher than original strain.

Objective To investigate the impact of femoral prosthesis malposition on internal structural strain in unicompartmental knee arthroplasty for osteoporotic knees. Methods A normal bone knee joint model was constructed based on imaging studies (CT, magnetic resonance imaging) of healthy volunteers, and an osteoporotic knee joint model was constructed by altering the elastic modulus. Finite element models of femoral prosthesis malposition in unicompartmental knee arthroplasty were then established for both normal bone and osteoporotic groups. A vertical static load of 1, 000 N was applied to both models, and the peak strain values and distributions were observed in the medial compartment structures (polyethylene gasket, cancellous bone under tibial prosthesis) and lateral compartment structures (meniscus, tibial cartilage) at various malposition angles of the femoral prosthesis. Results The peak strain values of the polyethylene gasket, cancellous bone under tibial prosthesis, meniscus, and tibial cartilage in the osteoporotic group were higher than those in the normal bone group at different varus and valgus angles. In the osteoporotic group, the peak strain values of the polyethylene gasket and cancellous bone under tibial prosthesis increased with the increase in femoral prosthesis malposition angle, with a greater increase at valgus angles than at varus angles. Similarly, the peak strain values of the meniscus and tibial cartilage increased with the increase in femoral prosthesis malposition angle, but the increase was greater at varus angles than at valgus angles. The strain concentration area of the polyethylene gasket was located in a circular-like area where the femoral prosthesis contacted the gasket, the strain concentration area of the cancellous bone was mainly located in the posterolateral region, the strain concentration area of the meniscus was located near the anterior horn, and the strain concentration area of the tibial cartilage was mainly located in the middle near the intercondylar eminence. Conclusion Osteoporosis may adversely affect the strain on internal structures of the knee joint after unicompartmental knee arthroplasty. Varus malposition of the femoral prosthesis may exacerbate the progression of osteoarthritis in the contralateral compartment (lateral compartment), while valgus malposition may increase the risk of prosthesis loosening and revision surgery.

Objective To investigate the impact of femoral prosthesis malposition on internal structural strain in unicompartmental knee arthroplasty for osteoporotic knees. Methods A normal bone knee joint model was constructed based on imaging studies (CT, magnetic resonance imaging) of healthy volunteers, and an osteoporotic knee joint model was constructed by altering the elastic modulus. Finite element models of femoral prosthesis malposition in unicompartmental knee arthroplasty were then established for both normal bone and osteoporotic groups. A vertical static load of 1, 000 N was applied to both models, and the peak strain values and distributions were observed in the medial compartment structures (polyethylene gasket, cancellous bone under tibial prosthesis) and lateral compartment structures (meniscus, tibial cartilage) at various malposition angles of the femoral prosthesis. Results The peak strain values of the polyethylene gasket, cancellous bone under tibial prosthesis, meniscus, and tibial cartilage in the osteoporotic group were higher than those in the normal bone group at different varus and valgus angles. In the osteoporotic group, the peak strain values of the polyethylene gasket and cancellous bone under tibial prosthesis increased with the increase in femoral prosthesis malposition angle, with a greater increase at valgus angles than at varus angles. Similarly, the peak strain values of the meniscus and tibial cartilage increased with the increase in femoral prosthesis malposition angle, but the increase was greater at varus angles than at valgus angles. The strain concentration area of the polyethylene gasket was located in a circular-like area where the femoral prosthesis contacted the gasket, the strain concentration area of the cancellous bone was mainly located in the posterolateral region, the strain concentration area of the meniscus was located near the anterior horn, and the strain concentration area of the tibial cartilage was mainly located in the middle near the intercondylar eminence. Conclusion Osteoporosis may adversely affect the strain on internal structures of the knee joint after unicompartmental knee arthroplasty. Varus malposition of the femoral prosthesis may exacerbate the progression of osteoarthritis in the contralateral compartment (lateral compartment), while valgus malposition may increase the risk of prosthesis loosening and revision surgery.

Objective To investigate the impact of femoral prosthesis malposition on internal structural strain in unicompartmental knee arthroplasty for osteoporotic knees. Methods A normal bone knee joint model was constructed based on imaging studies (CT, magnetic resonance imaging) of healthy volunteers, and an osteoporotic knee joint model was constructed by altering the elastic modulus. Finite element models of femoral prosthesis malposition in unicompartmental knee arthroplasty were then established for both normal bone and osteoporotic groups. A vertical static load of 1, 000 N was applied to both models, and the peak strain values and distributions were observed in the medial compartment structures (polyethylene gasket, cancellous bone under tibial prosthesis) and lateral compartment structures (meniscus, tibial cartilage) at various malposition angles of the femoral prosthesis. Results The peak strain values of the polyethylene gasket, cancellous bone under tibial prosthesis, meniscus, and tibial cartilage in the osteoporotic group were higher than those in the normal bone group at different varus and valgus angles. In the osteoporotic group, the peak strain values of the polyethylene gasket and cancellous bone under tibial prosthesis increased with the increase in femoral prosthesis malposition angle, with a greater increase at valgus angles than at varus angles. Similarly, the peak strain values of the meniscus and tibial cartilage increased with the increase in femoral prosthesis malposition angle, but the increase was greater at varus angles than at valgus angles. The strain concentration area of the polyethylene gasket was located in a circular-like area where the femoral prosthesis contacted the gasket, the strain concentration area of the cancellous bone was mainly located in the posterolateral region, the strain concentration area of the meniscus was located near the anterior horn, and the strain concentration area of the tibial cartilage was mainly located in the middle near the intercondylar eminence. Conclusion Osteoporosis may adversely affect the strain on internal structures of the knee joint after unicompartmental knee arthroplasty. Varus malposition of the femoral prosthesis may exacerbate the progression of osteoarthritis in the contralateral compartment (lateral compartment), while valgus malposition may increase the risk of prosthesis loosening and revision surgery.

Objective To investigate th effect of PCSK9 inhibitors on early intensive lipid-lowering therapy in patients with symptomatic intracranial atherosclerotic stenosis(ICAS).Method One hundred and thirty-nine symptomatic ICAS patients who attended the Xuzhou Central Hospital from October 2022 to August 2023 were collected.According to the choice of lipid-lowering regimen,they were divided into statin drug group(n=54),PCSK9 inhibitor group(n=42)and combination drug group(n=43).Baseline data,laboratory indices,adverse drug reactions,clinical neurological function scores and endpoint events of the three groups were collected and analyzed.Results There was no statistically significant difference in the clinical data among the three groups before treatment.Compared with pre-treatment,total cholesterol(TC)and low-density lipoprotein cholesterol(LDL-C)levels were significantly lower in the three groups after treatment(all P＜0.01),and peripheral blood leukocyte counts were significantly lower in the PCSK9 inhibitor group after treatment(P＜0.05).After treatment,the differences in TC and LDL-C levels and the proportions of LDL-C＜1.8 mmol/L after 2 weeks of medication and LDL-C＜1.4 mmol/L on the 90th day were statistically significant among the three groups(all P＜0.01).Compared with the statin drug group,the differences in TC and LDL-C levels and the proportions of LDL-C＜1.8 mmol/L after 2 weeks and LDL-C＜1.4 mmol/L on the 90th day in the PCSK9 inhibitor group and the combination drug group were statistically significant(all P＜0.05).The differences in the occurrence of endpoint events,the proportion of recurrent AIS or TIA,cardiovascular events,and the time to endpoint events among the three groups were statistically significant on the 180th day after treatment(all P＜0.05).Differences in the occurrence of endpoint events,proportion of cardiovascular sexual events,and time to endpoint events on day 180 after treatment were statistically different in the PCSK9 inhibitor group and the combination drug group compared with the statin drug group(all P＜0.05).There was a statistically significant difference among the survival analysis curves of the three groups,with higher event-free survival in both groups with PCSK9 inhibitors alone or in combination(Log-Rank=13.95,P=0.0009).Conclusion Early intensive lipid lowering with PCSK9 inhibitors is effective and safe in patients with symptomatic ICAS,and can further reduce LDL-C,TC,and white blood cell counts,as well as improve lipid compliance,and significantly reduce the rate of end-point events with a significantly prolonged time to occurrence.

Objective To investigate the expression of Specific protein1(SP1)in esophageal squamous cell carci-noma(ESCC)and adjacent normal tissues and its effect on the proliferation and apoptosis of ESCC cells.Methods The expression of SP1 protein in 121 ESCC tissues and 74 adjacent normal tissues was detected by immunohisto-chemistry.Chi-square test and Cox regression analysis were used to analyze the relationship between SP1 and clini-copathological parameters and survival prognosis of ESCC patients.SP1 siRNA(small interfering RNA)was con-structed and transfected into esophageal squamous cell carcinoma Eca1 09 and EC9706 cell lines.Western blot was used to detect the expression of SP1 after transfection.The effects of SP1 on the proliferation and apoptosis of e-sophageal squamous cell carcinoma cells were detected by cloning assay,CCK-8 cell proliferation assay and flow cytometry.Results SP1 protein was expressed in the nucleus of esophageal squamous cell carcinoma tissues,and the expression rate of SP1 protein in esophageal squamous cell carcinoma tissues was significantly higher than that in adjacent normal tissues(x2=20.568,P＜0.01).Comparison between groups showed that the high expression rate of SP1 was higher in female(P=0.041),moderately or poorly differentiated(P=0.038)and T3-T4 inva-sion depth(P=0.041)ESCC(esophageal squamous cell carcinoma)patients.Log-rank test showed that the sur-vival time of patients with high expression of SP1 was shorter than that of patients with low expression of SP1(P=0.048).Multivariate Cox regression analysis showed that TNM(tumor node metastasis classification)stage(Ⅲ+Ⅳ)was a potential risk factor for shorter survival time in patients with esophageal squamous cell carcinoma(P＜0.001).Cell biological experiments showed that compared with the control group,the proliferation ability of esoph-ageal squamous cell carcinoma cell lines decreased(P＜0.05)and the apoptosis index increased(P＜0.05)after silencing SP1.Conclusion SP1 protein is highly expressed in human esophageal squamous cell carcinoma tissues and is associated with poor prognosis in patients.Silencing SP1 can inhibit the proliferation of esophageal squamous cell carcinoma cells and promote their apoptosis.

OBJECTIVETo investigate the expression and significance of miR-125a and anti-apoptotic protein Mcl-1 in intestinal tissue after massive small bowel resection in intestinal adaptation.

METHODSSprague-Dawley rats (54 male rats, 8-week old) were divided into 3 groups randomly, including two control groups. Rats in the experiment group were subjected to 70% massive small bowel resection. Rats in the resection group underwent simple intestinal resection and anastomosis. Rats in the control group underwent laparotomy alone. A 5 cm intestine approximately 1 cm distal to the anastomosis was harvested a week after operation. Expression of Mcl-1 was assessed by immunohistochemistry and real-time PCR was used to detect the expression of miR-125a in intestinal tissue.

RESULTSThe positive expression of Mcl-1 in the experiment group was 18.8%(3/16), significantly lower than that in the control group(76.5%, 13/17) and the resection group (83.33%, 15/18)(both P<0.01). The expression of miR-125a in the experiment group was 1.92, significantly higher than that in the control group (1.01) and the resection group (1.05)(both P<0.01).

CONCLUSIONmiR-125a and anti-apoptotic protein Mcl-1 may play an important role in intestinal adaptation process and they may regulate each other through a certain pathway.

Anastomosis, Surgical ; Animals ; Disease Models, Animal ; Intestine, Small ; metabolism ; surgery ; Male ; MicroRNAs ; metabolism ; Myeloid Cell Leukemia Sequence 1 Protein ; metabolism ; Rats ; Rats, Sprague-Dawley ; Short Bowel Syndrome ; metabolism

Objective:To compare the clinical characteristics and analyze the prognostic factors between human immunodeficiency virus (HIV)-infected patients and non-HIV-infected immunocompromised patients with pneumocystis pneumonia (PCP) complicated with acute respiratory failure (ARF) in intensive care unit (ICU).Methods:The clinical data of patients with PCP complicated with ARF admitted in ICU of The First Affiliated Hospital of Zhengzhou University and The Sixth People′s Hospital of Zhengzhou City between May 2018 and October 2020 were retrospectively reviewed. All subjects were divided into HIV-infected group and non-HIV-infected immunocompromised group. General characteristics and underlying diseases of patients in the two groups were analyzed. Laboratory parameters, treatment and outcomes between two groups were compared. Independent sample t test, Mann-Whitney U test and chi-square test were used for statistical analysis, and univariate and multivariate logistic regression models were used to identify the risk factors for the clinical outcome. Results:A total of 129 PCP complicated with ARF patients were enrolled, including 75 HIV-infected patients and 54 non-HIV-infected immunocompromised patients. Only 10.7%(8/75) patients of HIV-infected group received anti-retroviral therapy (ART), but none of the patients in either groups had previously received trimethoprim-sulfamethoxazole (TMP-SMX) for PCP prophylaxis. Acute physiology and chronic health evaluation (APACHE) Ⅱ score of HIV-infected group was 18.7±6.0, which was higher than that in non-HIV-infected immunocompromised group (13.1±4.4) when admitted in ICU ( t=-5.45, P<0.001). Hypoproteinemia was common in both groups. Ninety-six percent (72/75) of HIV-infected patients had CD4 + T lymphocyte counts lower than 200/μL and 84.0%(63/75) of patients had CD4 + T lymphocyte counts even lower than 50/μL, while 5.74%(31/54) of patients in non-HIV-infected immunocompromised group had CD4 + T lymphocyte counts lower than 200/μL. The CD4 + /CD8 + T lymphocyte counts ratio was 0.05(0.02, 0.12) in HIV-infected group, which was lower than that in non-HIV-infected immunocompromised group (0.96(0.64, 1.44)), and the difference was statistically significant ( Z=-9.16, P<0.001). The length of ICU stay and hospital stay of non-HIV-infected immunocompromised patients were 10.0(7.0, 14.0) days and 18.0(11.8, 32.5) days, respectively, which were both longer than those in HIV-infected patients (7.0(4.0, 9.0) days and 13.0(7.0, 23.0) days, respectively), and the differences were both statistically significant ( Z=-3.58 and -2.73, respectively, both P<0.050). The hospital mortality of HIV-infected patients was 57.3%(43/75), which was significantly higher than that in non-HIV-infected immunocompromised patients (38.9%, 21/54) ( χ2=4.27, P=0.039). Multivariable logistic regression identified that lactic dehydrogenase (LDH), C-reactive protein (CRP) and APACHE Ⅱ score were the risk factors for the clinical outcome of HIV-infected patients (odds ratio ( OR)= 1.006, 1.015 and 1.736, respectively, all P<0.050). The partial pressure of oxygen in arterial blood/fractional concentration of inspiratory oxygen (PaO 2/FiO 2), LDH and CD4 + T lymphocyte counts were the risk factors for the clinical outcome of non-HIV infected immunocompromised patients ( OR=0.970, 1.008 and 0.989, respectively, all P<0.050). Conclusions:PCP patients with ARF are critically ill with high mortality rate. LDH, CRP and APACHEⅡscore are predictors for prognosis of HIV-infected patients with PCP, while PaO 2/FiO 2, LDH and CD4 + T lymphocyte counts are predictors for prognosis of non-HIV infected immunocompromised patients with PCP.

As the National Health Commission changes the management of novel corona virus infection, the situation and preventive policies for controlling the epidemic have also entered a new stage in China. Perioperative care strategies for orthopedic trauma such as designated isolation and nucleic acid test screening have also been adjusted in the new stage. Based on the perioperative work experiences in the new stage of epidemic from the frontline anti-epidemic staff of orthopedics in domestic hospitals and combined with the literature and relevant evidence-based medical data in perioperative care of orthopedic trauma patients under the current anti-epidemic policies at home and abroad, Chinese Orthopedic Association and Chinese Society of Traumatology organized relevant experts to formulate the Guideline for clinical perioperative care of orthopedic trauma patients in the new stage of novel corona virus infection ( version 2023). The guideline summarized 16 recommendations from the aspects of preoperative diagnosis and treatment, infection prevention, emergency operation and postoperative management to systematically standardize the perioperative clinical pathways, diagnosis and treatment processes of orthopedic trauma in the new stage of novel corona virus infection, so as to provide a guidance and reference for hospitals at all levels to carry out relevant work in current epidemic control policies.