Objective: To analyze the temporal variation patterns of sickness absenteeism among primary and secondary school students in Shanghai, so as to explore models suitable for predicting peaks and intensity of absenteeism rates. Methods: The seasonal and trend decomposition using loess (STL) method was used to analyze the seasonal and long term trend changes in sickness absenteeism among primary and secondary school students from September 1 in 2010 to June 30 in 2018, in Shanghai. A hierarchical clustering method based on Dynamic Time Warping (DTW) was employed to classify absenteeism symptoms with similar temporal patterns. Based on historical data, the study constructed and evaluated different time series algorithms and machine learning models to optimize the accuracy of predicting the trend of sickness absenteeism. Results: During the research period, the average new absenteeism rate due to illness was 16.86 per 10 000 person day for every academic year, and the trend of sickness absenteeism exhibited both seasonality and a long term upward trend, reaching its highest point in the 2017 academic year (22.47 per 10 000 person day). The symptoms of absenteeism were divided into three categories: high incidence in winter and spring (respiratory symptoms, fever and general discomfort, etc.), high incidence in summer (eye symptoms, nosebleeds, etc.) and those without obvious seasonality (skin symptoms, accidental injuries, etc.).The constructed time series models effectively predicted the trend of absenteeism due to illness, although the accuracy of predicting peak intensity was relatively low. Among them, the multi layer perceptron (MLP) model performed the best, with an root mean squared error (RMSE) of 8.96 and an mean absolute error (MAE) of 4.37, reducing 36.51% and 39.02% compared to the baseline model. Conclusion Time series models and machine learning algorithms could effectively predict the trend of sickness absenteeism, and corresponding prevention and control measures can be taken for absenteeism caused by different symptoms during peak periods.

Objective: To investigate the distribution characteristics and related factors of weight loss behavior among middle school students in Shanghai, so as to provide a reference for guiding scientific weight loss among middle school students. Methods: From May to June 2021, a stratified cluster random sampling method was used to select 16 758 junior and high school students in 16 districts of Shanghai. Youth Risk Behavior Surveillance System was administered to assess the basic condition and weight loss behaviors of the students. An unordered multinomial Logistic regression model was employed to analyze the factors associated with weight loss behaviors. Results: A total of 5 881 (35.09%) reported engaging in exercise for weight loss, 6 344 (37.86%) reported dieting for weight loss, and 461 (2.75%) engaged in unhealthy weight loss behaviors. The unordered multinomial Logistic regression analysis indicated that compared with the no weight loss behavior group, students from urban areas( OR =1.35,95% CI =1.10-1.66), those with Internet addiction ( OR =1.71,95% CI =1.23-2.38), those with victims of bullying ( OR =2.09, 95% CI =1.68-2.61), those experiencing insomnia ( OR =2.33,95% CI = 1.74-3.11), those feelings of sadness or despair ( OR =3.10, 95% CI =2.42- 3.97 ), and those who perceived their body weight as slightly heavy ( OR =2.77, 95% CI = 2.17-3.55) or very heavy ( OR =3.41, 95% CI =2.44-4.75) were more likely to engage in unhealthy weight loss behaviors ( P <0.05). Conclusions There are significant differences in weight loss behaviors among middle school students with varying characteristics in Shanghai. Negative emotions such as insomnia and feelings of sadness or despair, Internet addiction, cognitive bias in weight and experiences of bullying are identified as related factors for unhealthy weight loss behaviors. Targeted intervention measures should be implemented to guide students towards scientific approaches to weight management.

ObjectiveTo investigate the analgesic effect of Tuina at the "Weizhong （BL 40）" on neuropathic pain in a rat model of chronic constriction injury （CCI） of the sciatic nerve and its potential central spinal mechanisms. MethodsThirty-two Sprague-Dawley rats were randomly divided into four groups （8 rats in each group）， sham-operated group， model group， Tuina group， and blockade group. The CCI model was established in the model group， Tuina group， and the blockade group by ligating the sciatic nerve with catgut， while the sham-operated group underwent only sciatic nerve exposure without ligation. From postoperative day 4 to day 14， rats in the Tuina group and the blockade group received Tuina manipulation at the "Weizhong （BL 40）" using a dynamic pressure distribution measurement system （5 N pressure， 2 Hz frequency， 10 min per session， once daily）. The blockade group also received intraperitoneal injections of the microglial inhibitor minocycline （10 mg/kg） once daily. The sham-operated and the model group underwent the same handling and fixation as the Tuina group without actual Tuina. Mechanical withdrawal threshold （MWT） and paw withdrawal latency （PWL） were measured before surgery and on day 3， 7， 10， and 14 post-surgery. Transmission electron microscopy was used to evaluate sciatic nerve injury and repair， measuring axon diameter and total myelinated fiber diameter to calculate the g-ratio. Western Blotting was performed to detect the protein levels of ionized calcium-binding adapter molecule 1 （Iba-1）， CD206， CD68， interleukin-10 （IL-10）， and β-endorphin （β-EP） precursor pro-opiomelanocortin （POMC） in the ipsilateral spinal dorsal horn. ResultsCompared with the sham-operated group， the model group showed significantly reduced MWT and PWL on day 3， 7， 10， and 14 （P＜0.01）. Compared with the model group， the Tuina group and the blockade group showed increased MWT and PWL on day 10 and 14 （P＜0.05）. Compared with the Tuina group， the blockade group exhibited higher MWT on day 7， 10， and 14， and higher PWL on day 10 （P＜0.05）. Sciatic nerve pathological morphology revealed intact and well-structured myelin in the sham-operated group， while the model group exhibited myelin collapse， distortion， and myelin ovoid formation. The Tuina group displayed partially irregular myelin with occasional myelin collapse， whereas the blockade group exhibited partial myelin irregularities and phospholipid shedding. Compared with the sham-operated group， the model group showed a decreased g-ratio and increased levels of Iba-1 and CD68 in the spinal dorsal horn （P＜0.05 or P＜0.01）. Compared with the model group， the Tuina group and the blockade group exhibited an increased g-ratio and reduced Iba-1 and CD68 levels. Additionally， the Tuina group showed elevated levels of CD206， IL-10， and POMC， whereas the blockade group had decreased CD206 levels （P＜0.05）. ConclusionTuina at "Weizhong （BL 40）" alleviates neuropathic pain in CCI rats， potentially by regulating microglial activation in the spinal cord， inhibiting M1 polarization while promoting M2 polarization， and activating the IL-10/β-EP pathway to exert analgesic effects.

Objective To explore the association between different levels of fluoride exposure and dyslipidemia in elderly people, and to analyze the influencing factors and their interactions. Methods A total of 1 143 elderly people over 60 years old were randomly selected from historical high water fluorosis areas and control areas in Tianjin. Logistic regression model and classification tree model were used to analyze the influencing factors of dyslipidemia, and to analyze the interaction between high fluoride exposure and relevant influencing factors on dyslipidemia. Results The prevalence of elevated low density lipoprotein cholesterol (LDL-C) was 5.69% (65/1 143). There was a significant difference in the prevalence of high LDL-C in different fluoride-exposed areas (2 = 0.092，P = 0.762). Multivariate logistic analysis showed that high fluoride exposure (OR=2.306，95%CI：1.185-4.491) and abdominal obesity (OR=2.274，95%CI：1.299-3.978) were risk factors for high LDL-C, while type B personality (OR=0.529，95%CI：0.308-0.908) was a protective factor for high LDL-C. The results of classification tree model showed that abdominal obesity contributed the most to the prevalence of high LDL-C in the elderly, followed by high fluoride exposure and hyperglycemia. There was a significant multiplicative interaction between high fluoride exposure and abdominal obesity on dyslipidemia (OR=5.191,95%CI：1.609-16.745，P=0.006). Conclusion High fluoride exposure may increase the risk of high LDL-C, and there is a multiplicative interaction between high fluoride exposure and abdominal obesity on dyslipidemia.

To identify the intestinal roundworms of Eclectus roratus and Psittacula alexandri from the Guangdong region by morphological analysis and molecular biology techniques,and to amplify the mitochondrial genome of parrot roundworms using PCR,as well as to carry out phylogenetic analyses based on the sequences of their mitochondrial genes.The results showed that the parrot roundworms identified in this identification belongs to Ascaridia.nymphii and its mitochondrial genome consists of 12 protein coding genes,22 tRNA genes,2 ribosomal RNA genes and two non-coding regions.Phylogenetic analyses showed that A.nymphii identified in this study is located in the same evolutionary branch as the previously reported Ascaridia sp.,is closely related and con-stitutes a separate clade of avian ascarids with pigeon roundworms and chicken roundworms.This study provides important data for the classification,molecular epidemiology and population genetic evolution of parrot roundworms.

Objective To explore the biomechanical responses of the cupula of the human semicircular canal to three basic rotational perception processes.Methods A one-dimensional visual semicircular canal model was successfully fabricated using three-dimensional printing and hydrogel physical cross-linking technologies,and the response deformation of the cupula was explored by applying constant angular velocity,constant angular acceleration,and sinusoidal oscillation stimulations.Results The time constant of the biomimetic semicircular canal model was stable at approximately 3 s and close to the human time constant.The displacement deformation of the ampullary cupula was proportional to the angular acceleration applied.Under sinusoidal oscillation stimulation of 0.07-5.00 Hz,the gain of the semicircular canal increased from 1.54 um/° rises to 42.34 μm/°,but the phase difference decreased from 109.72° to 11.27°.Conclusions The biomimetic semicircular canal model prepared in this study can accurately simulate the working mechanism of the human semicircular canal and is expected to play a role in mechanism research and disease diagnosis of the human vestibular semicircular canal.

AIM:To explore the expression and distribution of synaptic and extrasynaptic glutamate receptors under the action of amyloid β-protein 42 oligomers(Aβ42Os)in Alzheimer disease.METHODS:In vitro,primary neu-rons from neonatal mice were treated with different concentrations of Aβ42Os.In vivo,Aβ42Os were stereotaxically injected into the lateral ventricle of C57BL/6 mice.Western blot was used to detect the protein levels of metabotropic gultamate re-ceptor 5(mGluR5)and N-methyl-D-aspartate receptor(NMDAR)subunits(NR2A,NR2B and NR1)in mouse primary neurons and mice.Immunofluorescence staining was performed to observe the distribution of mGluR5 and NMDAR.Addi-tionally,Western blot was employed to examine the expression of mGluR5 downstream phosphatidylinositol 3-kinase(PI3K)/protein kinase B(PKB/AKT)signaling pathway-related proteins,calcium signaling pathway-related proteins and synapse-related proteins in mouse hippocampal tissues.RESULTS:(1)High concentrations of Aβ42Os increased mGluR5 expression in mouse primary neurons,but reduced the expression of NR2A,NR2B and NR1(P<0.01).Treatment of pri-mary neurons with high concentration of Aβ42Os resulted in aggregation of mGluR5 on the membrane surface,and re-duced the expression of NR2A,NR2B and NR1 on the membrane surface.(2)High concentration of Aβ42Os increased the expression of synaptic mGluR5 in mouse hippocampal tissues(P<0.01),but reduced the expression of synaptic NR2A(P<0.05)and NR2B(P<0.01)and increased the expression of extrasynaptic NR2B(P<0.01).High concentration of Aβ42Os inhibited the expression of PI3K and the phosphorylation of AKT and extracellular signal-regulated kinase(ERK),and overactivated calcium/calmodulin-dependent protein kinase IIα(CaMKIIα).High concentration of Aβ42 decreased the expression of postsynaptic density protein 95,spinophilin,synaptophysin and microtubule-associated protein 2(P<0.01).CONCLUSION:(1)High concentrations of Aβ42Os increase mGluR5 expression and decrease NR2A,NR2B and NR1 expression in synapse,along with an increase in extrasynaptic NR2B.(2)High concentrations of Aβ42Os inhibit the PI3K/AKT and ERK signaling pathways,overactivated the CaMKIIα pathway,and destroyed the synaptic structures.

Purpose To investigate the difference of cerebral blood flow between sleep deprivation and rest wakefulness.Materials and Methods Fifty subjects were recruited from universities in Xi'an from October 2020 to December 2021.The psychomotor vigilance test(PVT)task was used to measure sustained attention.Arterial spin labeling technique was used to analyze and compare the relative cerebral blood flow(rCBF)between sleep deprivation and rest wakefulness.The correlation between altered rCBF of specific brain regions and PVT task performance after sleep deprivation was analyzed.Results Compared with rest wakefulness,rCBF in bilateral dorsolateral prefrontal lobe,bilateral parietal lobule,left orbital middle frontal gyrus,bilateral middle temporal gyrus,right posterior central gyrus,and bilateral angular gyrus was significantly decreased after sleep deprivation.The rCBF of bilateral thalamus,left precuneus,right medial prefrontal lobe,left posterior cingulate gyrus,and left inferior temporal gyrus was significantly increased(FDR corrected,P<0.05,cluster size≥20 voxels).The changes of rCBF in left dorsolateral prefrontal lobe and right parietal lobule were significantly negatively correlated with the PVT task performance(r=-0.56,P<0.001;r=-0.64,P<0.001),and the change of rCBF of left precuneus was significantly positively correlated with the PVT task performance(r=0.72,P<0.001).Conclusion The abnormal changes of CBF in default mode network,frontoparietal network-related brain regions and thalamic may be the important neural mechanism of sustained attentional decline after sleep deprivation.

Immune checkpoint inhibitors(ICI),an immunotherapy,have an important role in the treatment of various cancers.However,ICIs induce several immune-related adverse events(irAEs).Interleukin(IL)-6 is an important inflammatory factor that promotes cancer progres-sion and modulates the clinical application of ICIs through various mechanisms.Herein,we postulate possible mechanisms that are involved in the ICI-regulatory effects mediated by the expression of the cytokine interleukin-6(IL-6),elucidate the effect of IL-6 on checkpoint-block-ade therapy and irAEs,and summarize the role of IL-6 signaling-targeted interventions in ICIs efficacy and irAEs management.

Objective To investigate the status and the influencing factors of thyroid volume of children aged 8-10 years in Tianjin. Methods Among the 1-2 primary schools were randomly selected from 12 districts in Tianjin. A total of 1 090 children were selected by class cluster sampling method (half male and half female, with a balanced age distribution). A questionnaire survey was conducted. Children’s height, weight and thyroid volume were measured, and their salt iodine content and urinary iodine content were detected. Results I n this study, the median urinary iodine in children was 161.35 µg/L, the mean thyroid volume was 2.56 mL, and the goiter rate was 3.58%. Univariate analysis showed that age, BSA, salt iodine content, urinary iodine content, eating habits, food taste, eating lunch at school, father's work, anxiety and depression, pressure, and different regional grouping were the influencing factors of thyroid volume (P<0.05). Multivariate linear regression showed that BSA, age, food taste, and urinary iodine content had significant independent effects on thyroid volume (P<0.05). Conclusion In Tianjin, the iodine nutrition level of children aged 8-10 years is at an appropriate level. When evaluating the thyroid volume of children, in addition to age factors, other factors such as physical development level and iodine intake should also be considered.