Objective：To evaluate Tpeak-Tend （Tp-e） interval in surface standard ECG as a new risk factor for arrhythmic event in patient with Brugada syndrome. Methods： 23 male patients with Brugada syndrome and 20 male pati...Objective：To evaluate Tpeak-Tend （Tp-e） interval in surface standard ECG as a new risk factor for arrhythmic event in patient with Brugada syndrome. Methods： 23 male patients with Brugada syndrome and 20 male patients with paroxysmal supraventricular tachycardia （PSVT） as the control group were investigated in this study. Tp-e interval in surface standard ECG was compared between BrS and PSVT patients. Results： Tp-e interval in BrS patients was significantly longer than that in PSVT patients （109.57±22.86 ms vs. 88.50±13.08ms, P〈0.05）. There was significant difference in Tp-e interval between 16 BrS patients with arrhythmic events （including syncope, clinical ventricular fibrillation [VF] and programmed electrica/ stimulation [PES]-induced VF） and 7 BrS patients without arrhythmic events and PSVT patients （118.12±20.40ms vs. 90.00±15.27ms, P〈0.05; 118.12±20.40ms vs. 88.50±13.08ms, P〈0.05）. However, Tp-e interval was similar in BrS patients without arrhythmic events and PSVT patients （90.00±15.27ms vs 88.50±13.08ms, P〉0.05）. Conclusion： The prolongation of Tp-e interval could serve as a new noninvasive event predictor for arrhythmic events in patients with Brugada syndrome.展开更多
This paper introduced the preparation work before transplanting big olive trees(Olea europaea L.),including key technical measures such as plant excavation,transportation,planting,and post-planting tending.The aim was...This paper introduced the preparation work before transplanting big olive trees(Olea europaea L.),including key technical measures such as plant excavation,transportation,planting,and post-planting tending.The aim was to provide scientific basis and feasible solutions for adjusting the density of olive trees in Shiyan City,and to assist in the high-quality development of the olive industry.展开更多
Tending management and pest control directly affect forest construction.Not only sustainable growth of timber but also continuous and permanent use of green mountains and water can be achieved by providing tending man...Tending management and pest control directly affect forest construction.Not only sustainable growth of timber but also continuous and permanent use of green mountains and water can be achieved by providing tending management measures for sustainable operations and implementing effective pest control measures.According to the demand of production practice,this paper studies the tending management and pest control measures of Pinus koraiensis forest during its growth period,so as to provide important scientific support for improving the quality of P.koraiensis forest in the future.展开更多
At this stage, in order to accelerate the development of regional forestry, the first step is to make rational use of forestry forestation and tending technology, strengthen the attention to the management of seedling...At this stage, in order to accelerate the development of regional forestry, the first step is to make rational use of forestry forestation and tending technology, strengthen the attention to the management of seedlings, young forests and mature forests during the growth of trees, and do a good job in the relevant control of fire prevention, damage prevention, pest prevention, etc. The mature trees should be cut and protected in a standardized way so as to create economic benefits in forestry production and realize the long-term sustainable development of forestry and provide a good environmental foundation for the construction of social and ecological civilization.展开更多
Under the current social development environment, in order to further promote the harmonious and coordinated development of man and nature, it is necessary to implement the management and optimization of forest resour...Under the current social development environment, in order to further promote the harmonious and coordinated development of man and nature, it is necessary to implement the management and optimization of forest resources, among which forest tending must be perfected. Forest tending work is based on scientific and reasonable means, combined with the actual growth law of forest resources and the growth characteristics of communities in different regions, to implement the cultivation and expansion of the resource system by means of artificial intervention. At the same time, the plan should be reasonably adjusted in combination with the overall demand and development status of forest resources in the society. It has strong systematic characteristics. Forest tending can promote the forest resources to be managed and protected in an all-round way, and improve their social and economic benefits and ecological benefits.展开更多
The management of larch is very important, which is the key period to ensure the output of seedlings and improve the quality of seedlings. In order to further improve the overall afforestation level and quality of Lar...The management of larch is very important, which is the key period to ensure the output of seedlings and improve the quality of seedlings. In order to further improve the overall afforestation level and quality of Larix gmelinii, combining with practice, this paper analyzes the afforestation techniques and corresponding tending management of Larix gmelinii from the aspects of nursery site selection, land preparation and bed making, seed treatment and sowing, etc., and makes targeted analysis from three aspects: seedling management, afforestation management and tending management in fallen leaves, aiming to provide some technical reference for Larix gmelinii afforestation.展开更多
With the rapid development of social economy, China has gradually begun to attach great importance to ecological environment protection and ecological civilization construction. At the same time, innovative forest ten...With the rapid development of social economy, China has gradually begun to attach great importance to ecological environment protection and ecological civilization construction. At the same time, innovative forest tending management techniques and new forest tending management techniques are selected to effectively expand the total green area. However, in reality, there are still some shortcomings in the forest tending management technology. It is necessary to work out all-round management plans from the fields of management and the comprehensive ability of staff, so as to make contributions to improving the environment in China.展开更多
In order to improve the level of forest management, it is necessary to strengthen the innovation and optimization of forest management technology in order to protect forest resources and meet the needs of forest ecosy...In order to improve the level of forest management, it is necessary to strengthen the innovation and optimization of forest management technology in order to protect forest resources and meet the needs of forest ecosystems. The key of logging technology is to solve the problems in the process of tree growth through various logging measures and healthy growth of trees. Through in-depth analysis of relevant forestry technology content, we are studying the important role of forestry technology in forest diameter, forest height, effective protection of wood and improvement of forest quality and environmental sanitation and the growth of trees.展开更多
8. Ji Daiyu, General Manager of Baotou Xinyuan RareEarth Hi-Tech Materials Co. LtdControl gross to stabilize prices. Chinese rare earth is precious strategic resource. The more it is exploit, the less it will be. The ...8. Ji Daiyu, General Manager of Baotou Xinyuan RareEarth Hi-Tech Materials Co. LtdControl gross to stabilize prices. Chinese rare earth is precious strategic resource. The more it is exploit, the less it will be. The State has put forward rare earth policy of "strengthen management, protect resource, develop scientifically and face international". Chinese rare展开更多
The ligamentization process of the tendon graft in anterior cruciate ligament(ACL)reconstruction is crucial for graft healing quality,thereby affecting knee joint function.Excessive scar tissue,caused by activation of...The ligamentization process of the tendon graft in anterior cruciate ligament(ACL)reconstruction is crucial for graft healing quality,thereby affecting knee joint function.Excessive scar tissue,caused by activation of trans-differentiation of fibroblasts to myofibroblasts,rather than orientated collagen fibers with normal composition and structure in the graft mid-substance seriously impacts ligamentization.The elucidation of the underlying mechanism behind the graft fibrosis may facilitate modulation of tendon graft ligamentization.Here,we show that transforming growth factor beta 1(TGF-β1)was significantly upregulated with liga-mentization process,contributing to fibroblast to myofibroblast trans-differentiation and thereby leading to impaired collagen orientation with overproduction of collagen type III.Of note,we verified that prostaglandin E2(PGE2),a principal mediator of inflammation secreted by macrophages,significantly reversed TGF-β1-induced trans-differentiation of fibroblasts to myofibroblasts.Importantly,magnesium(Mg)ions were found to upregulate PGE2 production in macrophages,ul-timately favoring inhibition of scar tissue formation and promoting expression of ligament-like phenotype in the graft mid-substance in rats.Consistently,the rats,with injection of the sodium alginate containing Mg ions into knee joint cavity,exhibited significantly improved gait performance and failure load relative to the control group.These results demonstrate the feasibility of using Mg ions to modulate tendon ligamentization in patients after ACL reconstruction.展开更多
Background： Prolongation of the Tpeak-Tend （TpTe） interval as a measurement of transmural dispersion of repolarization （TDR） is an independent risk factor for chronic heart failure mortality, However, the cardiac...Background： Prolongation of the Tpeak-Tend （TpTe） interval as a measurement of transmural dispersion of repolarization （TDR） is an independent risk factor for chronic heart failure mortality, However, the cardiac resynchronization therapy＇s （CRT） effect on TDR is controversial. Therefore, this study aimed to evaluate CRTs acute and chronic effects on repolarization dispersion. Furthermore, we aimed to investigate the relationship between TpTe changes and ventricular arrbythmia. Methods： The study group consisted of 101 patients treated with CRT-defibrillator （CRT-D）. According to whether TpTe was shortened, patients were grouped at immediate and l-year follow-up after CRT, respectively. The echocardiogram index and ventricular arrhythmia were observed and compared in these subgroups. Results： For all patients, TpTe slightly increased immediately after CRT-D implantation, and then decreased at the l -year follow-up （from 107 ± 23 to 110 ± 21 rns within 24 h, to 94 ± 24 ms at 1-year follow-up, F 19.366, P 〈 0.001）. No significant difference in the left ventricular reverse remodeling and ventricular tachycardia/ventricular fibrillation （VT/VF） episodes between the TpTe immediately shortened and TpTe immediately nonshortened groups. However, patients in the TpTe at l-year shorten had a higher rate of the lelt ventricular （LV） reverse remodeling （65% vs. 44%, Z2 = 4.495, P - 0.038） and less VT/VF episodes （log-rank test, X2 - 10.207, P = 0.001 ） compared with TpTe I-year nonshortened group. TpTe immediately alter CRT-D independently predicted VT/VF episodes at l-year follow-up （hazard ratio [HR], 1.030; P = 0.001 ）. Conclusions： Patients with TpTe shortened at l -year after CRT had a higher rate of LV reverse remodeling and less VT/VF episodes. The acute changes of TpTe after CRT have minimal value on mechanical reverse remodeling and ventricular arrhythmia.展开更多
The shortage of forest tending funds in China has caused the retarded thinning for those forests that need urgently the tending thinning,which in turn has a negative impact on the implementation of forest management a...The shortage of forest tending funds in China has caused the retarded thinning for those forests that need urgently the tending thinning,which in turn has a negative impact on the implementation of forest management activities and results in the poor state of forest quality,function and healthy.This paper analyzed the necessity to implement forest tending subsidies,concluded the experience abroad,and proposed some policy recommendations on how to implement forest tending subsidies in China.It was indicated that forest tending subsidy policy should be fully implemented for a long time in China;the funds for forest tending subsidies should be obtained from multiple sources and multiple forms explored.The focus of the subsidy should be put on how to mobilize the enthusiasms of forest farms and forest farmers to engage in forest tending as well as on its ecological effects and livelihood benefits.At the same time,it is necessary to pay close attention to the problems propping up from forest products trade contributed to by the forest tending subsidies.展开更多
As China integrates into the world economy,its economic sustainability and industrial health become more vulnerable to external factors.While China’s grain security comes under intense pressure,thefinancialsectoris c...As China integrates into the world economy,its economic sustainability and industrial health become more vulnerable to external factors.While China’s grain security comes under intense pressure,thefinancialsectoris confrontedwithloomingrisks.Thecountry’s manufacturingindustryleads the world,but its competitiveness is impeded by a lack of high-end production.Many economists and experts discussed these issues at the 2011 China Economic Security Forum,recently held by the University of International Business and Economics in Beijing.Edited excerpts follow:展开更多
目的探讨高血压性左心室肥厚(hypertensive left ventricular hypertrophy,H-LVH)与肥厚型心肌病(hypertrophic cardiomyopathy,HCM)患者的心电图鉴别诊断。方法选取90例H-LVH患者(H-LVH组)和60例HCM患者(HCM组),均行体表12导联心电图...目的探讨高血压性左心室肥厚(hypertensive left ventricular hypertrophy,H-LVH)与肥厚型心肌病(hypertrophic cardiomyopathy,HCM)患者的心电图鉴别诊断。方法选取90例H-LVH患者(H-LVH组)和60例HCM患者(HCM组),均行体表12导联心电图检查。比较两组患者肢体导联和胸前导联T波峰-末(Tpeak-Tend,Tp-e)间期、最小Tp-e间期、最大Tp-e间期及校正Tp-e间期;记录两组心电图离散程度,包括QT间期离散度(QT dispersion,QTd)、最大QT间期和最小QT间期。采用ROC曲线分析各导联Tp-e间期鉴别诊断H-LVH与HCM的ROC曲线下面积。结果相比于H-LVH组,HCM组Ⅰ、Ⅱ、aVR、aVF、V5、V6导联的Tp-e间期均明显增大(P<0.01);平均最小Tp-e间期、最大Tp-e间期及校正Tp-e间期均明显增大(P<0.01)。H-LVH组的最大QT间期、最小QT间期、QTd均明显低于HCM组(均P<0.05)。在各导联中,Ⅱ导联Tp-e间期的ROC曲线下面积最大,为0.83(95%CI0.71~0.96,P<0.01)。结论H-LVH与HCM患者体表12导联心电图表现明显不同,两种疾病在心电图离散程度方面存在一定的差异,并且最小Tp-e间期、最大Tp-e间期、校正Tp-e间期及Ⅱ导联的Tp-e间期对H-LVH与HCM具有较高的鉴别诊断价值。展开更多
The change of pine scale (Hemiberlesia pitysophila Takagi) population density on pine forest in urban park between treatment (tending operations) and CK (no tending operations) was researched in this paper. The result...The change of pine scale (Hemiberlesia pitysophila Takagi) population density on pine forest in urban park between treatment (tending operations) and CK (no tending operations) was researched in this paper. The results were shown as follows: population density declined to 0.63 head per bundle from 2.61 heads per bundle when crown density of pine in urban park had become 0.5 or so by means of cultivation activities such as felling, pruning and thinning and so on, and drop got to 75.86 percent. The pinewoods would soon get revived once using these cultivation activities, so tending operations was main measures controlling over harm of pine scale in urban park; At the same time, population density of pine scale on pinewoods in the sunny slope was more than that in the somber slope and it had become less and less from sunny slope to somber slope. Therefore, tree species must be chosen in the planning and design of urban park for preventing harm and happening of pine scale.展开更多
基金This study was supported by National Natural Science Foundation ofChina (No: 30570746)
文摘Objective：To evaluate Tpeak-Tend （Tp-e） interval in surface standard ECG as a new risk factor for arrhythmic event in patient with Brugada syndrome. Methods： 23 male patients with Brugada syndrome and 20 male patients with paroxysmal supraventricular tachycardia （PSVT） as the control group were investigated in this study. Tp-e interval in surface standard ECG was compared between BrS and PSVT patients. Results： Tp-e interval in BrS patients was significantly longer than that in PSVT patients （109.57±22.86 ms vs. 88.50±13.08ms, P〈0.05）. There was significant difference in Tp-e interval between 16 BrS patients with arrhythmic events （including syncope, clinical ventricular fibrillation [VF] and programmed electrica/ stimulation [PES]-induced VF） and 7 BrS patients without arrhythmic events and PSVT patients （118.12±20.40ms vs. 90.00±15.27ms, P〈0.05; 118.12±20.40ms vs. 88.50±13.08ms, P〈0.05）. However, Tp-e interval was similar in BrS patients without arrhythmic events and PSVT patients （90.00±15.27ms vs 88.50±13.08ms, P〉0.05）. Conclusion： The prolongation of Tp-e interval could serve as a new noninvasive event predictor for arrhythmic events in patients with Brugada syndrome.
基金Supported by Central Finance Forestry Science and Technology Demonstration and Extension Project (E[2023]TG14).
文摘This paper introduced the preparation work before transplanting big olive trees(Olea europaea L.),including key technical measures such as plant excavation,transportation,planting,and post-planting tending.The aim was to provide scientific basis and feasible solutions for adjusting the density of olive trees in Shiyan City,and to assist in the high-quality development of the olive industry.
文摘Tending management and pest control directly affect forest construction.Not only sustainable growth of timber but also continuous and permanent use of green mountains and water can be achieved by providing tending management measures for sustainable operations and implementing effective pest control measures.According to the demand of production practice,this paper studies the tending management and pest control measures of Pinus koraiensis forest during its growth period,so as to provide important scientific support for improving the quality of P.koraiensis forest in the future.
文摘At this stage, in order to accelerate the development of regional forestry, the first step is to make rational use of forestry forestation and tending technology, strengthen the attention to the management of seedlings, young forests and mature forests during the growth of trees, and do a good job in the relevant control of fire prevention, damage prevention, pest prevention, etc. The mature trees should be cut and protected in a standardized way so as to create economic benefits in forestry production and realize the long-term sustainable development of forestry and provide a good environmental foundation for the construction of social and ecological civilization.
文摘Under the current social development environment, in order to further promote the harmonious and coordinated development of man and nature, it is necessary to implement the management and optimization of forest resources, among which forest tending must be perfected. Forest tending work is based on scientific and reasonable means, combined with the actual growth law of forest resources and the growth characteristics of communities in different regions, to implement the cultivation and expansion of the resource system by means of artificial intervention. At the same time, the plan should be reasonably adjusted in combination with the overall demand and development status of forest resources in the society. It has strong systematic characteristics. Forest tending can promote the forest resources to be managed and protected in an all-round way, and improve their social and economic benefits and ecological benefits.
文摘The management of larch is very important, which is the key period to ensure the output of seedlings and improve the quality of seedlings. In order to further improve the overall afforestation level and quality of Larix gmelinii, combining with practice, this paper analyzes the afforestation techniques and corresponding tending management of Larix gmelinii from the aspects of nursery site selection, land preparation and bed making, seed treatment and sowing, etc., and makes targeted analysis from three aspects: seedling management, afforestation management and tending management in fallen leaves, aiming to provide some technical reference for Larix gmelinii afforestation.
文摘With the rapid development of social economy, China has gradually begun to attach great importance to ecological environment protection and ecological civilization construction. At the same time, innovative forest tending management techniques and new forest tending management techniques are selected to effectively expand the total green area. However, in reality, there are still some shortcomings in the forest tending management technology. It is necessary to work out all-round management plans from the fields of management and the comprehensive ability of staff, so as to make contributions to improving the environment in China.
文摘In order to improve the level of forest management, it is necessary to strengthen the innovation and optimization of forest management technology in order to protect forest resources and meet the needs of forest ecosystems. The key of logging technology is to solve the problems in the process of tree growth through various logging measures and healthy growth of trees. Through in-depth analysis of relevant forestry technology content, we are studying the important role of forestry technology in forest diameter, forest height, effective protection of wood and improvement of forest quality and environmental sanitation and the growth of trees.
文摘8. Ji Daiyu, General Manager of Baotou Xinyuan RareEarth Hi-Tech Materials Co. LtdControl gross to stabilize prices. Chinese rare earth is precious strategic resource. The more it is exploit, the less it will be. The State has put forward rare earth policy of "strengthen management, protect resource, develop scientifically and face international". Chinese rare
基金supported by the National Natural Science Foundation of China(Grant Nos.:32271381 and 32471378)the Science and Technology Innovation Commission of Shenzhen(Grant No.:JCYJ20220530145601004)+1 种基金Guangdong Basic and Applied Basic Research Foundation(Grant No.:2024A1515010311)Young Elite Sci-entists Sponsorship Program 2023 of ShanDong Provincial Medical As-sociation,and Science and Technology Plan Project of Jinan(202328050).
文摘The ligamentization process of the tendon graft in anterior cruciate ligament(ACL)reconstruction is crucial for graft healing quality,thereby affecting knee joint function.Excessive scar tissue,caused by activation of trans-differentiation of fibroblasts to myofibroblasts,rather than orientated collagen fibers with normal composition and structure in the graft mid-substance seriously impacts ligamentization.The elucidation of the underlying mechanism behind the graft fibrosis may facilitate modulation of tendon graft ligamentization.Here,we show that transforming growth factor beta 1(TGF-β1)was significantly upregulated with liga-mentization process,contributing to fibroblast to myofibroblast trans-differentiation and thereby leading to impaired collagen orientation with overproduction of collagen type III.Of note,we verified that prostaglandin E2(PGE2),a principal mediator of inflammation secreted by macrophages,significantly reversed TGF-β1-induced trans-differentiation of fibroblasts to myofibroblasts.Importantly,magnesium(Mg)ions were found to upregulate PGE2 production in macrophages,ul-timately favoring inhibition of scar tissue formation and promoting expression of ligament-like phenotype in the graft mid-substance in rats.Consistently,the rats,with injection of the sodium alginate containing Mg ions into knee joint cavity,exhibited significantly improved gait performance and failure load relative to the control group.These results demonstrate the feasibility of using Mg ions to modulate tendon ligamentization in patients after ACL reconstruction.
文摘Background： Prolongation of the Tpeak-Tend （TpTe） interval as a measurement of transmural dispersion of repolarization （TDR） is an independent risk factor for chronic heart failure mortality, However, the cardiac resynchronization therapy＇s （CRT） effect on TDR is controversial. Therefore, this study aimed to evaluate CRTs acute and chronic effects on repolarization dispersion. Furthermore, we aimed to investigate the relationship between TpTe changes and ventricular arrbythmia. Methods： The study group consisted of 101 patients treated with CRT-defibrillator （CRT-D）. According to whether TpTe was shortened, patients were grouped at immediate and l-year follow-up after CRT, respectively. The echocardiogram index and ventricular arrhythmia were observed and compared in these subgroups. Results： For all patients, TpTe slightly increased immediately after CRT-D implantation, and then decreased at the l -year follow-up （from 107 ± 23 to 110 ± 21 rns within 24 h, to 94 ± 24 ms at 1-year follow-up, F 19.366, P 〈 0.001）. No significant difference in the left ventricular reverse remodeling and ventricular tachycardia/ventricular fibrillation （VT/VF） episodes between the TpTe immediately shortened and TpTe immediately nonshortened groups. However, patients in the TpTe at l-year shorten had a higher rate of the lelt ventricular （LV） reverse remodeling （65% vs. 44%, Z2 = 4.495, P - 0.038） and less VT/VF episodes （log-rank test, X2 - 10.207, P = 0.001 ） compared with TpTe I-year nonshortened group. TpTe immediately alter CRT-D independently predicted VT/VF episodes at l-year follow-up （hazard ratio [HR], 1.030; P = 0.001 ）. Conclusions： Patients with TpTe shortened at l -year after CRT had a higher rate of LV reverse remodeling and less VT/VF episodes. The acute changes of TpTe after CRT have minimal value on mechanical reverse remodeling and ventricular arrhythmia.
文摘The shortage of forest tending funds in China has caused the retarded thinning for those forests that need urgently the tending thinning,which in turn has a negative impact on the implementation of forest management activities and results in the poor state of forest quality,function and healthy.This paper analyzed the necessity to implement forest tending subsidies,concluded the experience abroad,and proposed some policy recommendations on how to implement forest tending subsidies in China.It was indicated that forest tending subsidy policy should be fully implemented for a long time in China;the funds for forest tending subsidies should be obtained from multiple sources and multiple forms explored.The focus of the subsidy should be put on how to mobilize the enthusiasms of forest farms and forest farmers to engage in forest tending as well as on its ecological effects and livelihood benefits.At the same time,it is necessary to pay close attention to the problems propping up from forest products trade contributed to by the forest tending subsidies.
文摘As China integrates into the world economy,its economic sustainability and industrial health become more vulnerable to external factors.While China’s grain security comes under intense pressure,thefinancialsectoris confrontedwithloomingrisks.Thecountry’s manufacturingindustryleads the world,but its competitiveness is impeded by a lack of high-end production.Many economists and experts discussed these issues at the 2011 China Economic Security Forum,recently held by the University of International Business and Economics in Beijing.Edited excerpts follow:
文摘The change of pine scale (Hemiberlesia pitysophila Takagi) population density on pine forest in urban park between treatment (tending operations) and CK (no tending operations) was researched in this paper. The results were shown as follows: population density declined to 0.63 head per bundle from 2.61 heads per bundle when crown density of pine in urban park had become 0.5 or so by means of cultivation activities such as felling, pruning and thinning and so on, and drop got to 75.86 percent. The pinewoods would soon get revived once using these cultivation activities, so tending operations was main measures controlling over harm of pine scale in urban park; At the same time, population density of pine scale on pinewoods in the sunny slope was more than that in the somber slope and it had become less and less from sunny slope to somber slope. Therefore, tree species must be chosen in the planning and design of urban park for preventing harm and happening of pine scale.
