Objective To track and evaluate the implementation and application of the occupational health standard Radiation shielding requirements for radiotherapy room—Part 4: Radiotherapy room of ²⁵²Cf neutron afterloading (GBZ/T 201.4-2015) by radiation health technical service agencies, medical institutions, health supervision agencies, and radiotherapy facility design units, and to provide a scientific basis for the further revision and implementation of this standard. Methods Following the Guideline for health standards tracking evaluation (WS/T 536-2017) and the project implementation plan, relevant practitioners were randomly selected for a questionnaire survey. The survey primarily focused on their awareness, standard training, application, and revision suggestions of GBZ/T 201.4-2015. The results were summarized and analyzed. Results A total of 168 evaluation questionnaires were collected from relevant practitioners in 28 provinces. Only 31.6% of the respondents reported being “well familiar” or “ familiar” with the standard, 27.4% of the respondents believed that the standard was widely used, and 45.2% of the respondents believed that the standard could meet the needs of their work. Only 14.9% of the respondents had received relevant training on the standard, more than half of the respondents had not applied the standard within the past 10 years, and 45.2% of the respondents believed that the standard "needs to be revised". Conclusion Due to the small number of californium-252 neutron afterloading radiotherapy devices in operation on the market, the overall awareness of the standard is low, suggesting that relevant authorities need to strengthen training and publicity of the standard, and that certain sections of the standard need to be revised or merged.

Objective To compare the stability of different Kirschner wire configurations for treating SH-Ⅱ type epiphyseal injury and damage to the epiphyseal plate in children.Methods The CT scanning data of a healthy femur from an eight-year-old child were collected;the image data were imported into Mimics 21.0 to establish a rough femoral and epiphyseal model,which was then imported into Geomagic 2013 to construct a surface model.The surface model was assembled in SolidWorks 2018 with three configurations(dispersed,double-crossed,and single-crossed K-wires)and then imported into ANSYS Workbench 2019.Various motion modes in reality were simulated through different mechanical loadings on the assembly.The maximum displacement of the fracture fragment,von Mises stress distribution,and maximum stress on the K-wire,epiphyseal plate,and fracture fragment were analyzed.Results The maximum displacements of the dispersed,double-crossed,and single-crossed K-wire groups occurred during abduction(2.39 mm),adduction(2.12 mm),and abduction(2.21 mm),and the maximum stress on the epiphyseal plate occurred during abduction(1.22 MPa),anterior flexion(0.20 MPa),and posterior extension(0.29 MPa),respectively.Conclusions The stability of the double-crossed K-wire configuration is superior to that of the dispersed and single-crossed K-wire configurations,with minimal damage to the epiphysis.

Objective To study the association of hypercoagulability with urinary protein and renal pathological damage in children with immunoglobulin A vasculitis with nephritis(IgAVN).Methods Based on the results of coagulation function,349 children with IgAVN were divided into a hypercoagulability group consisting of 52 children and a non-hypercoagulability group consisting of 297 children.Urinary protein and renal pathological features were compared between the two groups,and the factors influencing the formation of hypercoagulability in children with IgAVN were analyzed.Results Compared with the non-hypercoagulability group,the hypercoagulability group had significantly higher levels of urinary erythrocyte count,24-hour urinary protein,urinary protein/creatinine,urinary immunoglobulin G/creatinine,and urinary N-acetyl-β-D-glucosaminidase(P<0.05).The hypercoagulability group also had a significantly higher proportion of children with a renal pathological grade of Ⅲ-Ⅳ,diffuse mesangial proliferation,capillary endothelial cell proliferation,or>25％ crescent formation(P<0.05).The multivariate logistic regression analysis showed that capillary endothelial cell proliferation and glomerular crescent formation>25％ were associated with the formation of hypercoagulability in children with IgAVN(P<0.05).Conclusions The renal injury in IgAVN children with hypercoagulability is more severe,with greater than 25％ crescent formation and increased proliferation of glomerular endothelial cells being important contributing factors that exacerbate the hypercoagulable state in IgAVN.[Chinese Journal of Contemporary Pediatrics,2024,26(2):164-168]

Objective:To construct an analytic method aimed at the characteristics of the commonly method of supplementing and pouring of acupuncture based on the analysis and modeling of ultrasound images around acupoint region in the process of acupuncture.Methods:A total of 7 healthy subjects who underwent physical examination in Beijing Zhongguancun Hospital from June,2022 to June,2023 were selected,and their Kongzui acupoints were acupunctured by 10 acupuncturists with associate senior title as 4 kinds of acupuncture manipulations included reinforcing by twisting and rotating(RFTR),reducing by twisting and rotating(RDTR),reinforcing by lifting and thrusting(RFLT),and reducing by lifting and thrusting(RDLT).The B-ultrasound diagnostic device was used to collect the images of muscle and fascial tissue below the acupoint,so as to construct the model of images.The definition of virtual acupuncture point was adopted to study the regulation of perturbation of subcutaneous tissue that was caused after the skin was acupunctured by needle.The change regulation of the virtual acupuncture point of muscle bundle below skin at Zuikong acupoint of subjects was analyzed.Results:The difference value of average absolution value between peak and trough of the trajectory of virtual acupuncture point of twisting and rotating was 0.066±0.045,and the average value of amplitude of this method was less than that(0.428±0.276)of lifting and thrusting method,and the twisting and rotating method was uniform and symmetrical,and there was difference between two kinds of acupuncture methods.The characteristics of computer graphics was used to qualify the work effect of lifting and thrusting,and reinforcing and reducing,which showed the heavy insertion and light lifting of RFLT,and showed heavy lifting and light insertion of RDLT,thus distinguished the two methods[(RFLT)and(RDLT)].Conclusions:The ultrasound imaging and computer graphics can be used to analyze the regularity of the common"reinforcing and reducing"method of acupuncture and moxibustion.

Supracondylar humerus fractures represent the most prevalent type of upper limb fractures in pediatric patients. As a result of the interplay of external forces, muscular contractions, and periosteal reactions, these fractures are prone not only to axial displacement but also to rotational displacement in a certain degree. Rapid and accurate assessment of the rotational displacement holds a paramount importance for intraoperative realignment, choice of fixation modalities, and anticipation of postoperative function. Currently, methods to evaluate the rotational displacement involve X-ray, CT, and ultrasound, but the various assessment techniques and criteria often pose challenges in differentiation. This paper reviews the current diverse imaging modalities for assessment of the rotational displacement, aiming to translate the intricate three-dimensional spatial rotation into single-plane rotations within the coronal, sagittal, and horizontal planes, thereby aspiring to furnish those concerned with clinical guidance.

Objective To investigate the expression and potential diagnostic value of six-transmembrane epithelial antigen of prostate 1(STEAP1)in bladder transitional cell carcinoma.Methods 52 patients with transitional cell carcinoma of the bladder who underwent surgical treatment at the 940th Hospital of Joint Lo-gistics Support Force of the Chinese People's Liberation Army from June 2021 to December 2022 were select-ed as the observation group.In addition,52 patients with benign tumors of the bladder who matched basic clin-ical data such as age,gender,and disease incidence were selected as the control group.The relative expression levels of STEAP1 and STEAP1 mRNA in bladder tumor tissues of patients in the two groups were deter-mined by enzyme-linked immunosorbent assay and real-time fluorescence quantitative PCR,and the relative expression levels of STEAP1 and STEAP1 mRNA in bladder tumor tissues of patients with different patho-logical parameters were compared.Spearman correlation analysis and binary Logistic regression analysis were used to screen the risk factors for the occurrence and clinical stage of bladder transitional cell carcinoma.Re-ceiver operating characteristic(ROC)curve and area under the curve(AUC)were used to evaluate the diagnos-tic and predictive value of each indicator for bladder transitional cell carcinoma.Results The relative expres-sion levels of STEAP1 and STEAP1 mRNA in bladder tumor tissues in observation group were significantly higher than those in control group,with statistical significance(P＜0.05).The relative expression levels of STEAP1 and STEAP1 mRNA in bladder tumor tissues of patients with middle and advanced bladder transi-tional cell carcinoma were significantly higher than those of patients with early bladder transitional cell carci-noma,with statistical significance(P＜0.05).Binary Logistic regression analysis showed that the relative ex-pression level of STEAP1 and STEAP1 mRNA in bladder tumor tissues of patients were independent risk fac-tors for the development of bladder transitional cell carcinoma and middle and advanced bladder transitional cell carcinoma(P＜0.05).ROC curve analysis showed that the AUC of STEAP1 and STEAP1 mRNA inde-pendently predicting the occurrence of bladder transitional cell carcinoma was 0.841(95％CI:0.760-0.922,P＜0.001)and 0.936(95％CI:0.893-0.980,P＜0.001),respectively,both of which had high predictive ef-ficacy.Conclusion The relative expression levels of STEAP1 and STEAP1 mRNA in bladder tumor tissues of patients are positively correlated with the occurrence of bladder transitional cell carcinoma and the middle and advanced bladder transitional cell carcinoma,suggesting that STEAP1 can be used as a potential marker for di-agnosis and prediction of the occurrence and development of bladder transitional cell carcinoma.

BACKGROUND:Muscle weakness is a common symptom after coronavirus disease 2019(COVID-19)infection and affects the ability to perform daily activities in humans during recovery.Low-frequency pulsed magnetic field stimulation at a strength of 1.5 mT and a frequency of 3 300 Hz can enhance the maximal voluntary contraction and strength endurance of human skeletal muscle by inducing and activating classical transient receptor potential channel 1(TRPC1),which produces a series of pathological support effects on muscle tissue.It has not been studied whether this means will improve muscle weakness in patients recovering from COVID-19. OBJECTIVE:To select the low-frequency pulsed magnetic field for magnetic stimulation of lower limb muscle groups in patients with COVID-19,in order to observe the effect of this stimulation on the improvement of muscle weakness of lower limb muscle groups in patients with COVID-19 during the recovery period. METHODS:Fourteen patients infected with COVID-19(Omicron strain)positive for Innovita COVID-19 Ab Test(Colloidal Gold)and accompanied by muscle weakness were recruited and randomly divided into two groups:a test group receiving magnetic field stimulation and a control group receiving sham treatment,respectively.The total duration of the trial was 3 weeks.The test group was given low-frequency pulsed magnetic stimulation of the lower limbs every 48 hours and the control group was given the same intervention procedure as the test group but with sham stimulation.Patients in both groups were not informed whether the magnetic stimulation apparatus was running or not.Nine sessions were performed in both groups and the changes in the maximum voluntary contraction,explosive leg force and strength endurance of the local muscle groups of the lower limbs were subsequently observed in both groups. RESULTS AND CONCLUSION:Among the eight local muscle groups collected,seven local muscle groups in the test group showed an increase in the maximum voluntary contraction value after 3 weeks of low-frequency pulsed magnetic field stimulation.In the control group,there were only three muscle groups with improvement in the maximum voluntary contraction.The rate of improvement in the anterior and posterior muscle groups of the left leg in the test group was significantly higher than that in the control group.The longitudinal jump height and peak angular velocity of the knee joint in both groups were improved compared with the pre-test measurement,and the elevation rate of jumping height in the test group was higher than that in the control group.Under the fatigue condition,the decline rates of peak angular velocity of the knee joint and jumping height in the test group decreased significantly,while those in the control group did not change significantly.The above data confirmed that the low-frequency pulsed magnetic field stimulation with the intensity of 1.5 mT and frequency of 3 300 Hz could improve the muscle strength of more local muscle groups in the lower limbs of patients with COVID-19 during the recovery period compared with the human self-healing process,and the whole-body coordination ability and functional status based on explosive leg force of the legs could be significantly improved.Therefore,low-frequency pulsed magnetic field stimulation can be used as an effective,non-exercise rehabilitation tool to improve muscle weakness in the lower limbs of patients with COVID-19.

Damarane-type triterpene saponins are the main active ingredients in Gynostemma pentaphyllum (Thunb.) Makino. By using D101 macroporous adsorption resin and silica gel open-columns, C18 medium-pressure column chromatography, and preparative high performance liquid chromatography, we isolated four compounds from the leaves of G. pentaphyllum planted in Guangxi Zhuang Autonomous Region. Their structures were determined by comprehensive analyses of MS, NMR data and circular dichroism spectroscopy and identified as (3β,12β)-dihydroxy-25-peroxyhydrohydrodammarane-20,23-diene-3-O-[β-D-glucopyranosyl(1→2)]-β-D-glucopyranoside (1), (3β,12β,24S)-trihydroxydammarane-20,25-diene-3-O-[β-D-glucopyranosyl(1→2)]-β-D-glucopyranoside (2), (3β,20α)-dihydroxy-24-en-12β,22S-epoxydammarane-3-O-[β-D-glucopyranosyl(1→2)]-β-D-glucopyranoside (3), (3β,12β,20S)-trihydroxydammarane-24-en-3-O-[6-O-acetyl-β-D-glucopyranosyl(1→2)-β-D-glucopyranosyl]-20-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl (1→6)-β-D-glucopyranoside (4). Compounds 1-4 are new dammarane-type triterpene saponins.

Rare diseases still lack effective treatments, and the development of drugs for rare diseases (known as orphan drugs) is an urgent medical problem. As natural active ingredients in living organisms, some biomacromolecule drugs have good biocompatibility, low immunogenicity, and high targeting. They have become one of the most promising fields in drug research and development in the 21st century. However, there are still many obstacles in terms of in vivo delivery. In view of the unique advantages of nanocarriers prepared from polymers, lipids, organic biomimetic and inorganic materials in drug delivery, researchers are committed to building an efficient delivery system with versatility and synergy to solve the bottleneck issues in treating rare diseases with biomacromolecule drugs. Therefore, this article reviews the research progress of nanocarrier delivering proteins, peptides and nucleic acids in the field of rare disease treatment in the past ten years, which provides ideas for researches on biomacromolecule drug nanosystems in the field of treatment of rare diseases.

Developmental dyslexia (DD) is a prevalent learning disorder, and the KIAA0319 gene is a DD-associated gene, potentially affecting reading ability by influencing brain development. This review provides an overview of the impact of KIAA0319 gene on brain development in fish, non-primate mammals, primate mammals, and humans. In studies involving fish, the kiaa0319 gene was found to be expressed in the brain, eyes and ears of zebrafish. In mammalian studies, abnormal Kiaa0319 gene expression affected neuronal migration direction and final position, as well as dendritic morphology during embryonic development in rats, leading to abnormal white and gray matter development. Knocking down the Kiaa0319 gene impaired the primary auditory cortex in rats, resulting in phoneme processing impairment similar to DD. In mice, Kiaa0319 overexpression affected the neuronal migration process, causing delayed radial migration of neurons to the cortical plate. Knockout of the Kiaa0319 gene led to abnormal development of the gray matter in mice, resulting in reduced volume of the medial geniculate nucleus and then impacting auditory processing. In primate studies, research on marmosets found that KIAA0319 gene is expressed in the visual, auditory, and motor pathways, while studies on chimpanzees revealed that KIAA0319 gene abnormalities primarily affected the gray matter volume and microstructure of the posterior superior temporal gyrus, morphology of the superior temporal sulcus and gray matter volume of the inferior frontal gyrus. The impact of KIAA0319 gene on human brain development is mainly concentrated in the left temporal lobe, where abnormal KIAA0319 gene expression caused reduced gray matter in the left inferior temporal gyrus, middle temporal gyrus and fusiform gyrus, as well as reduced white matter volume in the left temporoparietal cortex. Abnormalities in KIAA0319 gene also led to decreased hemispheric asymmetry in the superior temporal sulcus. The above-mentioned brain regions are crucial for language and reading processing. It is analyzed that the abnormalities in the DD-associated KIAA0319 gene affect neuronal migration and morphology during brain development, resulting in abnormal development of subcortical structures (such as the medial geniculate nucleus and lateral geniculate nucleus) and cortical structures (including the left temporal cortex, temporoparietal cortex and fusiform gyrus) which are involved in human visual and auditory processing as well as language processing. Impairment of the medial geniculate nucleus affects the information transmission to the auditory cortex, leading to impaired phoneme processing. Abnormalities in the magnocellular layers within the lateral geniculate nucleus hinder the normal transmission of visual information to the visual cortex, affecting the dorsal visual pathway. The left temporal lobe is closely related to language and reading, and abnormalities in its gray matter and connections with other brain areas can affect the language and word processing. In summary, abnormalities in the KIAA0319 gene can partly explain current research findings on the cognitive and neural mechanisms of DD, providing a genetic basis for theoretical models related to DD (such as general sensorimotor theory and the magnocellular theory). However, the mechanism of developmental dyslexia is complex, and there are mutual influences between different DD-associated genes and between genes and the environment, which require further exploration.