Objective:To design and develop a cone-beam CT imaging system for small animals with continuously adjustable spatial resolution.Methods:The imaging system used an X-ray source with a focal spot size of 30 μm and a flat panel detector with a pixel size of 100 μm. On this premise, a " stepping-focusing-rotating" image acquisition mode was proposed, in which the " focusing" and " stepping" systems were sequentially embedded in the " rotating" system. In this acquisition mode, the X-ray source and flat panel detector were relatively stationary to form the " focusing" system. When the " stepping" system accurately transported the object to the scanning position, the " focusing" system could achieve adjustable spatial resolution by making linear motion around the object to be scanned according to different experimental requirements. Finally the " rotating" system achieve high-quality imaging.Results:The variable spatial resolution of small animal CBCT ranges from 35.7 μm to 71.4 μm, and the FOV ranges from 39.6 mm to 108.0 mm. The conversion time for the limit spatial resolution is 19.125 s, which allowed accurate 3D reconstruction of normal mice at different resolutions with high reproducibility.Conclusions:A cone-beam CT suitable for small animals has been developed, whose spatial resolution and FOV can be adjusted arbitrarily within a certain range, which can meet the different imaging requirements in rodent experiments.

Objective:To investigate the clinical efficacy of perforator-based bilobed flaps in the treatment of stage 4 pressure ulcers.Methods:This retrospective observational study included 29 patients (21 males, 8 females) with stage 4 pressure ulcers admitted to the Department of Burn and Plastic Surgery and Wound Repair at Xuzhou First People's Hospital from August 2021 to May 2023. The patients' ages ranged from 12 to 82 (61.3±15.7) years. For ischial tuberosity pressure ulcers, reconstruction was performed using a posterior femoral bilobed flap based on the first perforator of the deep femoral artery, combined with a small gluteus maximus muscle flap. Sacrococcygeal pressure ulcers were repaired using a bilobed flap based on the superior or inferior gluteal artery perforator. Post-operative follow-up lasted for 2-36 months, during which flap survival and complications were assessed.Results:All the 29 bilobed flaps were successfully rotated and provided for adequate coverage without the need for pedicle division or perforator vessel dissection. Primary healing was achieved in 26 cases, with suture removal occurring two weeks post-operatively. Three patients experienced partial wound dehiscence and marginal necrosis due to post-operative pressure, which healed after two weeks of debridement and dressing changes. During follow-up for 2-36 months, no pressure ulcer recurrence was observed. The flaps demonstrated excellent survival, with soft texture, good elasticity, and adequate blood supply. The donor sites healed with only linear scars, and no severe complications were reported.Conclusion:Bilobed flaps based on artery perforators demonstrate excellent clinical outcomes in the treatment of stage 4 pressure ulcers.

BACKGROUND:With the increase of age,the function of bone marrow-derived mesenchymal stem cells is gradually reduced,and delaying the aging of bone marrow-derived mesenchymal stem cells itself has become an important topic.OBJECTIVE:To explore ways to delay the aging of bone marrow-derived mesenchymal stem cells by changing the expression of telomerase Cajal body protein 1(TCAB1)gene.METHODS:Mouse bone marrow-derived mesenchymal stem cells were cultured by cell adhesion method.TCAB1 gene in bone marrow-derived mesenchymal stem cells was overexpressed and interfered by recombinant lentivirus technique.The expression of aging related genes P16,P21,P53,and P27 was detected by qPCR.The relative length of telomeres was detected by qPCR.The expression of aging proteins P16,P21,P53,and P27 was detected by western blot assay.Cell proliferation was detected by CCK-8 assay.Annexin V-PE/7-AAD apoptosis kit was used to detect the degree of cell apoptosis.RESULTS AND CONCLUSION:Bone marrow-derived mesenchymal stem cell lines overexpressing TCAB1 gene had decreased expression of senescence related genes and proteins,increased Telomere relative length,stronger cell proliferation,less apoptosis,and a youthful state.The expression of age-related genes and proteins in bone marrow mesenchymal stem cells interfering with TCAB1 gene increased,and the relative telomere length decreased;cell proliferation ability was weak;cell apoptosis was more,and cells showed senescence.These results indicate that increasing the expression of TCAB1 in an appropriate range can delay the rate of cell senescence.

Diseases caused by animal virus infection seriously restricts the healthy development of animal husbandry.In-depth study of the molecular mechanism of viral replication and pathogenesis will provide theoretical basis for screening vaccine and drug targets.N6-methyladenosine(m6 A)modification occurs extensively in viral and host transcriptomes and affects viral replication and pathogenicity by regulating gene expression,which acts as a novel regulator of gene expression in addition to DNA and protein modifications.Insight into the regulatory molecular mechanism of m6 A modification in virus infection is the research hotspots and frontiers.In recent years,there are re-ports of alternation of the m6 A modification-associated epitranscriptomes and related function a-nalysis during virus infection.Here,we summarize the alternation of the epitranscriptomes induced by African swine fever virus(ASFV),porcine reproductive and respiratory syndrome virus(PRRSV),porcine epidemic diarrhoea virus(PEDV),cestode virus(CSFV),porcine pseudorabies virus(PRV),Marek's disease virus(MDV),Newcastle disease virus(NDV),avian leukaemia virus(ALV)and duck hepatitis A virus(DHAV)infection,and the subsequent effects on viral replica-tion and pathogenicity.We also discuss the potential role and molecular mechanism of m6 A modification in animal virus replication and pathogenesis,which will contributes to the prevention and control for animal disease.

Objective To evaluate the clinical value of structured report(SR)for CT scans in laryngeal cancer.Methods Accord-ing to the American Joint Committee on Cancer(AJCC)8th edition TN staging,the SR template of CT suitable for initial diagnosis and staging of laryngeal cancer was constructed.It included 5 tumor-related points,4 lymph node-related points,and T and N staging.The differences in the occurrence rate of 11 key points and the accuracy of T and N staging between SR and narrative report(NR)were evaluated and compared.The readability,completeness and overall impression of SR were investigated among radiologists and otolaryngologists with different seniority.Results Finally,208 SR samples and 246 NR samples were included.Except for N0 stage,there were no statistical differences in age,sex ratio,laryngeal cancer classification,or T stage between SR and NR(P＞0.05).The occurrence rate of tumor size,extranodal extension(ENE),and T and N staging in early laryngeal cancer(T1-T2 stage)SR was higher than that in NR(P＜0.05).The occurrence rate of invasion of intra-and extra-pharyngeal vital structures,tumor size,enhancement degree,ENE,invasion of extranodal soft tissue,and T and N staging was higher in SR than that in NR in advanced laryngeal cancer(T3-T4 stage)(P＜0.05).There was no statistical difference in the accuracy of T and N staging between SR and NR(P＞0.05).Otolaryngologists rated the difficulty,completeness,and overall impression of SR higher than NR(P＜0.05).Radiologists rated the convenience,difficulty,and teaching value of SR higher than NR(P＜0.05).Conclusion Building a CT SR based on AJCC 8th edition TN staging suitable for initial diagnosis and staging of laryngeal cancer can improve the clarity and completeness of imaging reports,making it clinically feasible.

Objective:To design and develop a cone-beam CT imaging system for small animals with continuously adjustable spatial resolution.Methods:The imaging system used an X-ray source with a focal spot size of 30 μm and a flat panel detector with a pixel size of 100 μm. On this premise, a " stepping-focusing-rotating" image acquisition mode was proposed, in which the " focusing" and " stepping" systems were sequentially embedded in the " rotating" system. In this acquisition mode, the X-ray source and flat panel detector were relatively stationary to form the " focusing" system. When the " stepping" system accurately transported the object to the scanning position, the " focusing" system could achieve adjustable spatial resolution by making linear motion around the object to be scanned according to different experimental requirements. Finally the " rotating" system achieve high-quality imaging.Results:The variable spatial resolution of small animal CBCT ranges from 35.7 μm to 71.4 μm, and the FOV ranges from 39.6 mm to 108.0 mm. The conversion time for the limit spatial resolution is 19.125 s, which allowed accurate 3D reconstruction of normal mice at different resolutions with high reproducibility.Conclusions:A cone-beam CT suitable for small animals has been developed, whose spatial resolution and FOV can be adjusted arbitrarily within a certain range, which can meet the different imaging requirements in rodent experiments.

Objective To evaluate the clinical value of structured report(SR)for CT scans in laryngeal cancer.Methods Accord-ing to the American Joint Committee on Cancer(AJCC)8th edition TN staging,the SR template of CT suitable for initial diagnosis and staging of laryngeal cancer was constructed.It included 5 tumor-related points,4 lymph node-related points,and T and N staging.The differences in the occurrence rate of 11 key points and the accuracy of T and N staging between SR and narrative report(NR)were evaluated and compared.The readability,completeness and overall impression of SR were investigated among radiologists and otolaryngologists with different seniority.Results Finally,208 SR samples and 246 NR samples were included.Except for N0 stage,there were no statistical differences in age,sex ratio,laryngeal cancer classification,or T stage between SR and NR(P＞0.05).The occurrence rate of tumor size,extranodal extension(ENE),and T and N staging in early laryngeal cancer(T1-T2 stage)SR was higher than that in NR(P＜0.05).The occurrence rate of invasion of intra-and extra-pharyngeal vital structures,tumor size,enhancement degree,ENE,invasion of extranodal soft tissue,and T and N staging was higher in SR than that in NR in advanced laryngeal cancer(T3-T4 stage)(P＜0.05).There was no statistical difference in the accuracy of T and N staging between SR and NR(P＞0.05).Otolaryngologists rated the difficulty,completeness,and overall impression of SR higher than NR(P＜0.05).Radiologists rated the convenience,difficulty,and teaching value of SR higher than NR(P＜0.05).Conclusion Building a CT SR based on AJCC 8th edition TN staging suitable for initial diagnosis and staging of laryngeal cancer can improve the clarity and completeness of imaging reports,making it clinically feasible.

BACKGROUND:With the increase of age,the function of bone marrow-derived mesenchymal stem cells is gradually reduced,and delaying the aging of bone marrow-derived mesenchymal stem cells itself has become an important topic.OBJECTIVE:To explore ways to delay the aging of bone marrow-derived mesenchymal stem cells by changing the expression of telomerase Cajal body protein 1(TCAB1)gene.METHODS:Mouse bone marrow-derived mesenchymal stem cells were cultured by cell adhesion method.TCAB1 gene in bone marrow-derived mesenchymal stem cells was overexpressed and interfered by recombinant lentivirus technique.The expression of aging related genes P16,P21,P53,and P27 was detected by qPCR.The relative length of telomeres was detected by qPCR.The expression of aging proteins P16,P21,P53,and P27 was detected by western blot assay.Cell proliferation was detected by CCK-8 assay.Annexin V-PE/7-AAD apoptosis kit was used to detect the degree of cell apoptosis.RESULTS AND CONCLUSION:Bone marrow-derived mesenchymal stem cell lines overexpressing TCAB1 gene had decreased expression of senescence related genes and proteins,increased Telomere relative length,stronger cell proliferation,less apoptosis,and a youthful state.The expression of age-related genes and proteins in bone marrow mesenchymal stem cells interfering with TCAB1 gene increased,and the relative telomere length decreased;cell proliferation ability was weak;cell apoptosis was more,and cells showed senescence.These results indicate that increasing the expression of TCAB1 in an appropriate range can delay the rate of cell senescence.

Diseases caused by animal virus infection seriously restricts the healthy development of animal husbandry.In-depth study of the molecular mechanism of viral replication and pathogenesis will provide theoretical basis for screening vaccine and drug targets.N6-methyladenosine(m6 A)modification occurs extensively in viral and host transcriptomes and affects viral replication and pathogenicity by regulating gene expression,which acts as a novel regulator of gene expression in addition to DNA and protein modifications.Insight into the regulatory molecular mechanism of m6 A modification in virus infection is the research hotspots and frontiers.In recent years,there are re-ports of alternation of the m6 A modification-associated epitranscriptomes and related function a-nalysis during virus infection.Here,we summarize the alternation of the epitranscriptomes induced by African swine fever virus(ASFV),porcine reproductive and respiratory syndrome virus(PRRSV),porcine epidemic diarrhoea virus(PEDV),cestode virus(CSFV),porcine pseudorabies virus(PRV),Marek's disease virus(MDV),Newcastle disease virus(NDV),avian leukaemia virus(ALV)and duck hepatitis A virus(DHAV)infection,and the subsequent effects on viral replica-tion and pathogenicity.We also discuss the potential role and molecular mechanism of m6 A modification in animal virus replication and pathogenesis,which will contributes to the prevention and control for animal disease.

Objective:To investigate the clinical efficacy of perforator-based bilobed flaps in the treatment of stage 4 pressure ulcers.Methods:This retrospective observational study included 29 patients (21 males, 8 females) with stage 4 pressure ulcers admitted to the Department of Burn and Plastic Surgery and Wound Repair at Xuzhou First People's Hospital from August 2021 to May 2023. The patients' ages ranged from 12 to 82 (61.3±15.7) years. For ischial tuberosity pressure ulcers, reconstruction was performed using a posterior femoral bilobed flap based on the first perforator of the deep femoral artery, combined with a small gluteus maximus muscle flap. Sacrococcygeal pressure ulcers were repaired using a bilobed flap based on the superior or inferior gluteal artery perforator. Post-operative follow-up lasted for 2-36 months, during which flap survival and complications were assessed.Results:All the 29 bilobed flaps were successfully rotated and provided for adequate coverage without the need for pedicle division or perforator vessel dissection. Primary healing was achieved in 26 cases, with suture removal occurring two weeks post-operatively. Three patients experienced partial wound dehiscence and marginal necrosis due to post-operative pressure, which healed after two weeks of debridement and dressing changes. During follow-up for 2-36 months, no pressure ulcer recurrence was observed. The flaps demonstrated excellent survival, with soft texture, good elasticity, and adequate blood supply. The donor sites healed with only linear scars, and no severe complications were reported.Conclusion:Bilobed flaps based on artery perforators demonstrate excellent clinical outcomes in the treatment of stage 4 pressure ulcers.