In June 2018, for the first time, the SURA heating facility in Russia, together with the in-orbit China Seismo-Electromagnetic Satellite(CSES), carried out a series of experiments in emitting high frequency(HF) O-mode...In June 2018, for the first time, the SURA heating facility in Russia, together with the in-orbit China Seismo-Electromagnetic Satellite(CSES), carried out a series of experiments in emitting high frequency(HF) O-mode radio waves to disturb the ionosphere. This paper reports data from those experiments, collected onboard CSES, including electric field, in-situ plasma parameters, and energetic particle flux. Five cases are analyzed, two cases in local daytime and three in local nighttime. We find that the pumping wave frequencies f_0 in local daytime were close to the critical frequency of the F_2 layer f_oF_2, but no pumping waves were detected by the electric field detector(EFD) on CSES even when the emitted power reached 90 MW, and no obvious plasma disturbances were observed from CSES in those two daytime cases. But on June 16, there existed a spread F phenomena when f_0 was lower than f_oF_2 at that local daytime period.During the three cases in local nighttime, the pumping waves were clearly distinguished in the HF-band electric field at the emitted frequency with the emitted power only 30 MW; the power spectrum density of the electric field was larger by an order of magnitude than the normal background, with the propagating radius exceeding 200 km. Due to the small f_oF_2 over SURA in June at that local nighttime period, f_0 in these three cases were significantly higher than f_oF_2, all belonging to under-dense heating conditions. As for the plasma parameters, only an increase of about 100 K in ion temperature was observed on June 12; in the other two cases(with one orbit without plasma data on June 17), no obvious plasma disturbances were found. This first joint SURA-CSES experiment illustrates that the present orbit of CSES can cross quite close to the SURA facility, which can insure an effective heating time from SURA so that CSES can observe the perturbations at the topside ionosphere excited by SURA in the near region. The detection of plasma disturbances on June 12 with under-dense heating mode in local nighttime provides evidence for likely success of future related experiments between CSES and SURA,or with other HF facilities.展开更多
BACKGROUND Postoperative complications of triceps surae intramuscular hemangioma surgery with talipes equinovarus have rarely been described,and the evidence for treatment is limited.The purpose of this case study was...BACKGROUND Postoperative complications of triceps surae intramuscular hemangioma surgery with talipes equinovarus have rarely been described,and the evidence for treatment is limited.The purpose of this case study was to report the new application of the Ilizarov technique,which successfully treated talipes equinovarus in adults after triceps surae intramuscular hemangioma.CASE SUMMARY A 29-year-old woman treated with the Ilizarov technique for talipes equinovarus in the right leg after triceps surae intramuscular hemangioma surgery.The equinus deformity was roughly corrected after 2 years of follow-up,without significant secondary sequelae.CONCLUSION Talipes equinovarus caused by postoperative sequelae of intramuscular hemangioma was successfully corrected by the Ilizarov technique.The Ilizarov technique may be used for treating talipes equinovarus caused by various causes.展开更多
SurA is the major chaperone of outer membrane proteins(OMPs)in the periplasm.The molecular mechanism when SurA performs its chaperoning function is still unclear.Here,a purification-after-crosslinking(PAC)procedure wa...SurA is the major chaperone of outer membrane proteins(OMPs)in the periplasm.The molecular mechanism when SurA performs its chaperoning function is still unclear.Here,a purification-after-crosslinking(PAC)procedure was combined with single-molecule fluorescence resonance energy transfer(smFRET)to probe the conformations of SurA and OmpC in their complex.We found that SurA in the free state rearranges itself based on the crystal structure,except that the P2 domain moves towards the core domain with two major positions,forming a clamp-like conformation to accommodate OmpC.The obvious rearrangement of the P2 domain of SurA helps SurA to hold OmpC.OmpC attaches to SurA randomly and has the propensity to be near the middle part of the crevice.The noncollapsed and disordered conformations of OMPs provided by the OMPs?SurA complex are important to the subsequent delivery and folding process.展开更多
Purpose The present study aimed to test if a long-term passive stretching training causes adaptations of the medial gastroc-nemius architecture and the Achilles tendon (AT) tangent modulus.Methods A total of 20 males ...Purpose The present study aimed to test if a long-term passive stretching training causes adaptations of the medial gastroc-nemius architecture and the Achilles tendon (AT) tangent modulus.Methods A total of 20 males took part in the study.The stretching group (n =12),performed stretching exercises for the plantar flexors for 10 weeks,4-5 times a week,which comprised two static positions sustained twice each during 30 s.Results For the stretching group,maximum dorsiflexion angle,peak passive torque,and muscle-tendon unit maximum length significantly increased after training.No other differences were found related to muscle architecture and AT tangent modulus.Conclusion Joint amplitude gain after a long-term stretching of the triceps surae was not accompanied by structural or mechanical changes of the medial gastrocnemius and AT tendon,and seems to reflect an increasing stretch tolerance level.展开更多
在人体运动中,小腿三头肌-肌腱复合体(triceps surae muscle-tendon unit, MTU)是有效完成力的产生和传递以及能量储存和释放的关键,对运动效率有重要影响,但其损伤率也居高不下。本文对MTU的功能和跑步中MTU生物力学特性适应变化进行概...在人体运动中,小腿三头肌-肌腱复合体(triceps surae muscle-tendon unit, MTU)是有效完成力的产生和传递以及能量储存和释放的关键,对运动效率有重要影响,但其损伤率也居高不下。本文对MTU的功能和跑步中MTU生物力学特性适应变化进行概述,以深入理解MTU在运动过程中的功能,并探讨不同外部因素对MTU生物力学特性的影响,为提升跑步表现与预防损伤提供科学依据。跑步时前掌着地跑和穿着刚度更大的碳板跑鞋可以以较为经济的MTU形态学变化模式进行收缩或者回弹能量,即肌肉和其余弹性元件能用更经济的方式进行收缩或者回弹能量,以及肌肉收缩发力时的长度更接近于最佳肌束长度,降低肌肉收缩引起的能耗;采用前掌着地跑、裸足跑或穿着极简鞋跑步增加了MTU力学载荷;跑姿再训练后跑步时MTU能用更经济的方式进行收缩或者回弹能量,而其余单纯力量训练对其影响研究不够充分且效果较差。未来研究可进一步通过改善运动模式、装备和训练方法来优化MTU的生物力学特性,关注MTU的相互协调和平衡发展,从而提高运动表现,减少MTU损伤的发生。展开更多
目的探讨超声剪切波弹性成像对脑卒中下肢运动障碍患者小腿三头肌和跟腱进行康复评定的价值。方法 2018年至2019年,脑卒中后单侧下肢运动障碍住院患者32例,于康复治疗前后,对患者双侧小腿三头肌和跟腱行超声二维测量和剪切波弹性成像检...目的探讨超声剪切波弹性成像对脑卒中下肢运动障碍患者小腿三头肌和跟腱进行康复评定的价值。方法 2018年至2019年,脑卒中后单侧下肢运动障碍住院患者32例,于康复治疗前后,对患者双侧小腿三头肌和跟腱行超声二维测量和剪切波弹性成像检查,记录剪切波速度(SWV)以及跟腱(比目鱼肌肌腱)长度和厚度。结果治疗前,患侧跟腱和小腿三头肌SWV较健侧增高(t> 2.426, P <0.05);患侧跟腱长度较健侧显著增加(t=11.801, P <0.001);治疗后,患侧小腿三头肌SWV减低(t> 2.447, P <0.05);患侧跟腱长度显著缩短(t=8.577, P <0.001)。结论康复治疗可降低脑卒中下肢运动障碍患者小腿三头肌肌张力。超声剪切波弹性成像可用于评价跟腱和小腿三头肌弹性特征,指导脑卒中康复。展开更多
基金supported by NSFC projects (41674156, 41704156)the basic scientific foundation project of Institute of Earthquake Forecasting, CEA (2015IES0101)
文摘In June 2018, for the first time, the SURA heating facility in Russia, together with the in-orbit China Seismo-Electromagnetic Satellite(CSES), carried out a series of experiments in emitting high frequency(HF) O-mode radio waves to disturb the ionosphere. This paper reports data from those experiments, collected onboard CSES, including electric field, in-situ plasma parameters, and energetic particle flux. Five cases are analyzed, two cases in local daytime and three in local nighttime. We find that the pumping wave frequencies f_0 in local daytime were close to the critical frequency of the F_2 layer f_oF_2, but no pumping waves were detected by the electric field detector(EFD) on CSES even when the emitted power reached 90 MW, and no obvious plasma disturbances were observed from CSES in those two daytime cases. But on June 16, there existed a spread F phenomena when f_0 was lower than f_oF_2 at that local daytime period.During the three cases in local nighttime, the pumping waves were clearly distinguished in the HF-band electric field at the emitted frequency with the emitted power only 30 MW; the power spectrum density of the electric field was larger by an order of magnitude than the normal background, with the propagating radius exceeding 200 km. Due to the small f_oF_2 over SURA in June at that local nighttime period, f_0 in these three cases were significantly higher than f_oF_2, all belonging to under-dense heating conditions. As for the plasma parameters, only an increase of about 100 K in ion temperature was observed on June 12; in the other two cases(with one orbit without plasma data on June 17), no obvious plasma disturbances were found. This first joint SURA-CSES experiment illustrates that the present orbit of CSES can cross quite close to the SURA facility, which can insure an effective heating time from SURA so that CSES can observe the perturbations at the topside ionosphere excited by SURA in the near region. The detection of plasma disturbances on June 12 with under-dense heating mode in local nighttime provides evidence for likely success of future related experiments between CSES and SURA,or with other HF facilities.
基金Supported by Zhangzhou Natural Science Foundation Projects in 2019,No.ZZ2019J19。
文摘BACKGROUND Postoperative complications of triceps surae intramuscular hemangioma surgery with talipes equinovarus have rarely been described,and the evidence for treatment is limited.The purpose of this case study was to report the new application of the Ilizarov technique,which successfully treated talipes equinovarus in adults after triceps surae intramuscular hemangioma.CASE SUMMARY A 29-year-old woman treated with the Ilizarov technique for talipes equinovarus in the right leg after triceps surae intramuscular hemangioma surgery.The equinus deformity was roughly corrected after 2 years of follow-up,without significant secondary sequelae.CONCLUSION Talipes equinovarus caused by postoperative sequelae of intramuscular hemangioma was successfully corrected by the Ilizarov technique.The Ilizarov technique may be used for treating talipes equinovarus caused by various causes.
基金supported by the National Natural Science Foundation of China(21233002,21521003)the National Key Basic Research Special Foundation of China(2012CB917304)。
文摘SurA is the major chaperone of outer membrane proteins(OMPs)in the periplasm.The molecular mechanism when SurA performs its chaperoning function is still unclear.Here,a purification-after-crosslinking(PAC)procedure was combined with single-molecule fluorescence resonance energy transfer(smFRET)to probe the conformations of SurA and OmpC in their complex.We found that SurA in the free state rearranges itself based on the crystal structure,except that the P2 domain moves towards the core domain with two major positions,forming a clamp-like conformation to accommodate OmpC.The obvious rearrangement of the P2 domain of SurA helps SurA to hold OmpC.OmpC attaches to SurA randomly and has the propensity to be near the middle part of the crevice.The noncollapsed and disordered conformations of OMPs provided by the OMPs?SurA complex are important to the subsequent delivery and folding process.
基金financial support of FAPERJ(Rio de Janeiro State Research Funding Agency)CAPES(Brazilian National Research Funding Agency)+2 种基金CNPq(National Counsel of Technological and Scientific Development)FINEP(Funding Authority for Studies and Projects)the facility support of the Biomechanics Laboratory of Physical Education School of the Army.
文摘Purpose The present study aimed to test if a long-term passive stretching training causes adaptations of the medial gastroc-nemius architecture and the Achilles tendon (AT) tangent modulus.Methods A total of 20 males took part in the study.The stretching group (n =12),performed stretching exercises for the plantar flexors for 10 weeks,4-5 times a week,which comprised two static positions sustained twice each during 30 s.Results For the stretching group,maximum dorsiflexion angle,peak passive torque,and muscle-tendon unit maximum length significantly increased after training.No other differences were found related to muscle architecture and AT tangent modulus.Conclusion Joint amplitude gain after a long-term stretching of the triceps surae was not accompanied by structural or mechanical changes of the medial gastrocnemius and AT tendon,and seems to reflect an increasing stretch tolerance level.
文摘在人体运动中,小腿三头肌-肌腱复合体(triceps surae muscle-tendon unit, MTU)是有效完成力的产生和传递以及能量储存和释放的关键,对运动效率有重要影响,但其损伤率也居高不下。本文对MTU的功能和跑步中MTU生物力学特性适应变化进行概述,以深入理解MTU在运动过程中的功能,并探讨不同外部因素对MTU生物力学特性的影响,为提升跑步表现与预防损伤提供科学依据。跑步时前掌着地跑和穿着刚度更大的碳板跑鞋可以以较为经济的MTU形态学变化模式进行收缩或者回弹能量,即肌肉和其余弹性元件能用更经济的方式进行收缩或者回弹能量,以及肌肉收缩发力时的长度更接近于最佳肌束长度,降低肌肉收缩引起的能耗;采用前掌着地跑、裸足跑或穿着极简鞋跑步增加了MTU力学载荷;跑姿再训练后跑步时MTU能用更经济的方式进行收缩或者回弹能量,而其余单纯力量训练对其影响研究不够充分且效果较差。未来研究可进一步通过改善运动模式、装备和训练方法来优化MTU的生物力学特性,关注MTU的相互协调和平衡发展,从而提高运动表现,减少MTU损伤的发生。
文摘目的探讨超声剪切波弹性成像对脑卒中下肢运动障碍患者小腿三头肌和跟腱进行康复评定的价值。方法 2018年至2019年,脑卒中后单侧下肢运动障碍住院患者32例,于康复治疗前后,对患者双侧小腿三头肌和跟腱行超声二维测量和剪切波弹性成像检查,记录剪切波速度(SWV)以及跟腱(比目鱼肌肌腱)长度和厚度。结果治疗前,患侧跟腱和小腿三头肌SWV较健侧增高(t> 2.426, P <0.05);患侧跟腱长度较健侧显著增加(t=11.801, P <0.001);治疗后,患侧小腿三头肌SWV减低(t> 2.447, P <0.05);患侧跟腱长度显著缩短(t=8.577, P <0.001)。结论康复治疗可降低脑卒中下肢运动障碍患者小腿三头肌肌张力。超声剪切波弹性成像可用于评价跟腱和小腿三头肌弹性特征,指导脑卒中康复。
