标签归档 西安品茶论坛

The Paper (www.thepaper.cn) learned from China Construction International Group Co., Ltd. (hereinafter referred to as "China Construction International Group") that on June 21st, two community isolation treatment facilities (hereinafter referred to as "projects") aided by the central government in Penny’s Bay and Kai Tak were completed.

Huang Weilun, Director of the Development Bureau of the Hong Kong SAR Government, said at the delivery ceremony of the above-mentioned projects that the central government is the strongest backing of Hong Kong. He once again thanked the Central Committee for its guidance and full support, the Liaison Office of Hong Kong for its guidance and coordination, the full cooperation of various departments of the SAR Government, and the construction team for working against the clock, so that the project could be delivered in batches on schedule, greatly enhancing Hong Kong’s ability to fight the epidemic.

The above two projects have been delivered in batches since construction started in February this year. Up to now, a total of about 10,000 rooms have been provided, all of which were designed and built by China Construction International Group.

After the outbreak of The 5th Wave in Hong Kong, the central government decided to build 10 epidemic prevention facilities in Hong Kong. China Construction International Group was responsible for building 8 of them, including 6 temporary community isolation facilities and 2 permanent community isolation treatment facilities. The 6 temporary community isolation facilities were delivered on March 24th.

The completion and delivery of Penny’s Bay and Kai Tak projects also marks the delivery of all the epidemic prevention projects aided by the central government to Hong Kong.

"At present, the epidemic situation in Hong Kong has eased, but it still cannot be relaxed. We will concentrate all our efforts to promote the rapid completion of the project and provide a solid guarantee for Hong Kong to fight the COVID-19 epidemic in The 5th Wave. " Ye Hong, deputy commander-in-chief of the Central Committee’s aid to the Penny’s Bay Community Isolation Treatment Facility Project in Hong Kong, said.

The community isolation treatment facility in Kai Tak, which was assisted by the Central Government, was completed and delivered on June 21st. All the pictures in this article are provided by China Construction International Group.

"More than 90% of the workload has been prefabricated in the factory"

The two projects, Penny’s Bay and Kai Tak, which were aided by the central government, received the construction task on February 18th, and were formally constructed on February 19th, and delivered on June 21st.

The Kai Tak project is located next to the cruise terminal of the runway of the old airport in Kai Tak, Hong Kong. It covers an area of nearly 110,000 square meters and has a building area of over 110,000 square meters. It includes four-storey MiC quarantine facilities and other ancillary facilities, providing more than 2,700 isolation units and more than 6,000 isolation beds (including standard rooms, disabled suites, family suites and other rooms). It is the first four-storey community treatment facility in Hong Kong with elevator system. Upon completion, it will become the highest level permanent community isolation treatment facility project in Hong Kong.

Penny’s Bay Project is located in the northeast of Lantau Island, New Territories, Hong Kong. It covers an area of about 450,000 square meters, with a building area of about 272,000 square meters. It is divided into six areas, each of which is equipped with auxiliary facilities such as medical treatment, office and storage. It is the largest community isolation treatment facility project in Hong Kong.

During the design and construction of the above-mentioned projects, China State Construction International Group took epidemic prevention emergency and peacetime use into account, fully applied the modular design concept based on DfMA (Design for Manufacturing and Assembly), and at the same time applied MiC (Assembly and Synthesis Building Method) and prefabricated components, and integrated smart construction technology.

"More than 90% of the workload has been prefabricated in the factory." A manager of China State Construction International Group told The Paper that because of the parallel operation of the site and the factory, the site load was reduced, and the construction efficiency, quality and safety were guaranteed. Compared with traditional buildings, the construction period could be reduced by 40% to 90%, the material loss in the construction process could be reduced by more than 25%, the construction carbon emission by more than 50% and the construction waste emission by more than 70%.

The community isolation treatment facility in Penny’s Bay, a central aid port, was completed and delivered on June 21st.

Penny’s Bay and Kai Tak projects are in accordance with Hong Kong’s permanent building standards and Hong Kong’s building regulations, which can meet the durability requirements for 50 years. The whole cycle is safe and reliable. A single MiC box weighs 12 tons and can withstand a typhoon of magnitude 17.

Not only that, but also in the design and construction, it is more humanized. It not only has good shock-proof, sound insulation and heat insulation effects, but also requires extremely high details such as cleaning partition, drainage, sewage discharge and exhaust, and strictly implements the infection control standards of Hong Kong Quarantine Center.

Faced with the force majeure such as epidemic situation and weather, the construction team faced several challenges, such as short time, difficult recruitment, large workload, poor logistics and insufficient raw materials, but in the end the construction team broke through multiple challenges.

"We have built a life-cycle management system for intelligent traffic scheduling, from the factory production and maritime transportation of MiC boxes to warehousing and installation, to achieve life-cycle management." Liu Baoqing, the commander of the central government’s aid to build Hong Kong Kai Tak community isolation treatment facilities, said.

According to the materials provided by China Construction International Group, as the "rear area" of this project, Zhongjian Hailong Technology Co., Ltd. (hereinafter referred to as "Zhongjian Hailong") under the group undertakes the heavy responsibility of producing and transporting 10,032 main modules and 7,630 functional modules of two centrally aided community isolation treatment facilities projects, and its task scale is equivalent to 11 Vulcan Mountains.

In order to deliver all boxes with good quality and quantity, the company mobilized all available forces, worked 24 hours a day, completed drawing design in 2 days, purchased 50,000 tons of steel and hundreds of materials in 7 days, convened more than 400 managers and 5,300 workers in 10 days, and sent the first batch of MiC to Hong Kong in 14 days.

Shandong Hailong and Chongqing Hailong bases under China Construction Hailong stopped about 90% of their own production capacity, put all available production lines and personnel into the project, and completed materials procurement, box production, box decoration and other work in a very short time through professional integration and cross-deepening design and factory processing and prefabrication, with an average of more than 13,000 people starting work in a single day during the peak period.

Make every "impossible task" possible.

For all builders, this central aid to Hong Kong is an unforgettable life experience.

"Looking back at the beginning of the project, we are faced with the situation that we have to start work everywhere, design everywhere, and coordinate everywhere. Many employees have taken the initiative to come from all over the country to support, and they feel very embarrassed when they can’t come." Liu Baoqing said that he was deeply impressed by a project manager of the team who was unfortunately diagnosed with COVID-19 due to family contact. The project manager apologized for not being able to make efforts for the project.

"I was also very moved at that moment." Liu Baoqing said that the service life of the Kai Tak project he is responsible for is 50 years. Compared with several shelter projects completed in advance, this project needs to work together to achieve the goal.

Workers are working on the site of the community isolation treatment facility in Kai Tak, which is aided by the Central Government.

"We have been surpassing ourselves and breaking through the limits." Liu Baoqing said.

As an internal engineer of Kai Tak Project, Tong Anqi and the team are responsible for the ground structure and related projects at the project site.

He remembers that when the project started, Hong Kong was particularly wet and cold, and the somatosensory temperature was very low, and all the colleagues’ shoes were soaked. At that time, he thought, "This project must be a hard battle in the future."

Since then, it has proved to be true.

"At the beginning, due to the shortage of manpower, many colleagues were unable to go to work due to isolation, but there were still many colleagues who took the initiative to contact me and volunteered to participate in the war. Some of them have several jobs, and some colleagues and children have just been born, but they still come to the Kai Tak project without hesitation. At that time, they raised their hands, which still made me unforgettable. " Yan Anzhen said.

Jia Tao is also an internal engineer in the Kai Tak Community Project. He has previously participated in the construction of the emergency epidemic prevention and isolation center in Lei Yue Mun, Hong Kong and the temporary hospital in Hong Kong aided by the central government. Compared with before, this is the first time he is in charge of an engineering section, so he feels "great responsibility".

"For our planning and arrangement ability, communication and coordination ability, it is an’ upgraded version’ test." Jia Tao said that the Penny’s Bay project also faces several major challenges, such as large construction area, large number of people starting work and congenital insufficient traffic conditions.

Therefore, the construction team set up a matrix management system, publicized the construction plan to each team in time, held daily communication meetings on safety and environmental protection progress, promptly resumed trading, and investigated hidden dangers. It took 10 days to actively negotiate with the government to build two new docks to ensure that MiC boxes transported from the mainland were unloaded through the docks.

"From the earliest participation in the Lei Yue Mun project to the present, every time I feel that it is an impossible task, but with the joint efforts of our brothers, all these impossibilities have become possible." Ye Hong concluded.

He served as the deputy commander of Penny’s Bay Project this time, and had rich experience in epidemic prevention project construction before. In 2020, he participated in the emergency quarantine center project of Hong Kong Lei Yue Men Park Resort and the construction of phases 1B and 3B of Penny’s Bay Quarantine Center project, and was stationed in the factory of Zhongjian Hailong in Zhuhai to be responsible for the production and transportation of MiC boxes.

"This Penny’s Bay project involves more than 7,000 boxes, which is nearly 10 times the size of a single project at that time, but we have achieved great compression in time." Ye Hong said that during this construction, he fully felt the rapid development of the company’s rapid construction technology.

"This time, when I really have the opportunity to take charge of a specific work of the project, I will want to make my own contribution to the motherland and Hong Kong like my predecessors." Zheng Juehui, an engineer in the Penny’s Bay project aided by the central government, said that at the end of 2020, he had just arrived in Hong Kong to take part in the construction of the temporary hospital project aided by the central government in Hong Kong. This time, he was mainly responsible for material procurement, receipt, distribution and warehouse management in the Penny’s Bay project.

As a Hong Kong resident who participated in the epidemic prevention project for the first time, Zhang Weiquan claimed that he felt "a sense of honor" when he could participate in the epidemic prevention project.

Chen Bihua, who is also a Hong Kong resident, served as the subcontractor evaluation of the Kai Tak community isolation treatment facility project, and was responsible for the deployment of front-line construction workers, machinery and equipment of underground facilities such as earthwork, drainage and electric wires.

He has rich experience in the construction of epidemic prevention projects. He has previously participated in the construction of the quarantine center of Lei Yue Men Park Resort, the community treatment facility of Yabo Pavilion and the Hong Kong Infection Control Center of North Lantau Hospital.

At the beginning of the project, Chen Bihua realized the importance of the project to Hong Kong’s social epidemic prevention work, took the initiative to apply for follow-up projects, and devoted himself to the construction of the Kai Tak project.

"It is a meaningful thing to participate in the Kai Tak project. We all hope to contribute to the society and help all Hong Kong citizens." Chen Bihua said.

The green "safety exit" indicator light in public places is an important sign to deal with unexpected accidents. Recently, some citizens reported to the Beijing News that some of the "safety exit" indicator lights in the east underground passage of Xidan intersection and Xidan subway station in Xicheng District were out of order and there were potential safety hazards.

The Beijing News reporter visited Xidan, Tianqiao, Puhuangyu, Shilihe, Dawang Road and other subway stations, and found that the "safety exit" indicator light was not lit and the indicator signs were damaged in many stations.

The "safety exit" indicator near Exit D of Xidan subway station has been repaired. Photography/Beijing News reporter Wujiang

The failure of some indicator lights in the underground passage of Xidan intersection was reflected and repaired on the same day.

On the morning of August 16, the reporter visited the east underground passage of Xidan intersection mentioned by the public. There are 18 "safety exit" indicators on the walls on both sides of the passage at intervals of about 8 meters. The fault indicators reflected by the citizens were all repaired at this time. According to the staff, all the indicator lights in the channel have just been overhauled recently, and there is a special person to overhaul the channel equipment once a month. However, in the underground passage on the west side of Xidan intersection, although there are security guards standing guard, there is no "safety exit" indicator or logo.

The east and west passages of Xidan intersection lead to the two entrances and exits of the subway station respectively. The reporter entered Xidan Station of Metro Line 1 along the passage and checked the indicator light along five lines. At Xidan Station, there are indicator lights or signs beside the elevators at each entrance and exit, on the walls of underground passages, and on the columns near the trains. However, at least four indicators are not lit, and many indicators are low in brightness or only partially lit.

The reporter reported the situation to the person in charge of the subway station as a citizen, and the other party recorded it and promised to contact the maintenance personnel to check it on the same day.

In view of the low brightness of some indicator lights, the person in charge said that Metro Line 1 is the first subway in China. Due to the early construction time, some equipment along the station is not as advanced as the newly built subway station. "The low brightness of some indicator lights is not a fault, because they are not used for lighting. When there is an accident and power failure, the surrounding light becomes dim, and then the indicator lights can be seen clearly." The person in charge said that the "safety exit" sign posted on the wall has a fluorescent function, which absorbs light at ordinary times and can also emit light in the dark.

At two o’clock in the afternoon, the reporter came to Xidan subway station again and found that the workers with the words "Beijing Metro Electromechanical" printed on their clothes were leaving with ladders on their backs. The reporter noticed that the indicator light that failed in the morning has been repaired.

At Shilihe subway station on Line 14, a "safety exit" sign has been damaged. Photography/Beijing News reporter Huang Zhecheng

Shilihe and other subway stations are patrolled every day, but the indicator light is still faulty.

On August 17th, the reporter visited Dawanglu Station on Line 1, Puhuangyu Station and Shilihe Station on Line 14, and Tianqiao Station on Line 8. Compared with Line 1, Line 14 and Line 8 are newly opened subway lines in recent years, and the indicator lights in the stations along the lines are brighter and more densely distributed. However, these sites also have indicator failures and broken signs.

At noon that day, the reporter called Beijing Jinggang Metro Co., Ltd., which belongs to Line 14 subway, and the service hotline of Beijing Metro Operation Co., Ltd., which belongs to Line 1, as a citizen to feedback the fault. In the afternoon, the staff of Puhuangyu Station and Shilihe Station on Line 14 called back and said that the lights and signs in the stations had been thoroughly inspected and would be replaced in the near future.

According to the staff of Puhuangyu Station, after receiving the report, three indicator lights were found to be faulty and two indicator signs were damaged. The maintenance personnel will complete the maintenance in the afternoon. The person in charge of Shilihe River detected that two indicator lights were faulty and four indicator signs were damaged. The indicator signs will be replaced in the afternoon and the indicator lights will be replaced in the near future.

The person in charge of all the sites visited by the reporter said that there are special personnel in the station to overhaul all the equipment every month, and there are also people on duty to patrol in turn every day. Why was the indicator light problem not discovered in time? A person in charge said that sometimes there is a large passenger flow during peak hours, and the patrol personnel temporarily handle other emergencies, which may lead to the interruption of the patrol. Next, the patrol will be strengthened.

Mr. Wu, a citizen, believes that when an accident occurs, the public can evacuate in time according to the route indicated by the "safety exit" indicator light. If the indicator light cannot be repaired in time, it may lead to an accident. "It is not difficult to repair it in time, and it doesn’t cost much. The key is whether anyone notices it." Mr. Wu said that especially in some prosperous business districts, the daily passenger flow is large, and more attention should be paid to the safety of related facilities.

At noon on August 19, the reporter came to Shilihe Station and Puhuangyu Station on Line 14 again. The failed indicator light has been repaired and the broken indicator has been replaced.

At Xidan Station of Line 1, the brightness of some "exit" indicators is low.Photography/Beijing News reporter Huang Zhecheng

Tips

If you find the indicator light and other problems, you can contact the subway station staff or call the hotline.

In several subway stations, the reporter did not find the public information of the subway service hotline. Some passengers said that if a problem is found, I don’t know what department to call and what to call to reflect the situation.

In this regard, most subway staff said that they could contact the staff in the station directly, but some people on duty did not know what hotline to call.

The reporter learned that the Beijing subway line belongs to the jurisdiction of different operating companies. Among them, there are 16 operating lines under the jurisdiction of Beijing Metro Operation Co., Ltd., including Line 1, Line 2, Line 5, Line 6, Line 7, Line 8, Line 9, Line 10, Line 13, Line 15, Batong Line, Airport Line, Fangshan Line, changping line, Yizhuang Line and S1 Line. The company’s service hotline is 010-96165.

Beijing Jinggang Metro Co., Ltd. is responsible for the subway operation of Line 4, Line 16, Line 14 and Line Daxing, and its service hotline is 86-010-63988622.

Yanfang Line is managed by Beijing Rail Transit Operation Management Co., Ltd., and the passenger service hotline is 010-87837266.

Beijing News reporter Huang Zhecheng Co-reporter Wujiang

Editor ZhangChang proofreads He Yan.

　　[car home Technology] I don’t know if everyone in front of the screen knows anything about the 100,000-class pure electric compact car. As far as the author is concerned, the competition of this class of cars is actually quite fierce. On the one hand, it is a price war, on the other hand, it is repeatedly involved in design, safety and configuration. In this class of cars, (|) successfully circled the powder with its retro and beautiful shape. Of course, we don’t talk about design today, but look at the scientific and technological strength behind this boutique car through actual disassembly.

● Five-ring body frame

　　The length, width and height of Wuling Binguo are 3950*1708*1580mm respectively, and the wheelbase is 2560mm. Thanks to its front-drive pure electric platform technology, the cabin space utilization can be maximized.

　　For small cars, consumers are not only concerned about the performance of their cabin space, but also extremely concerned about their safety. Binguo adopts a five-ring car body frame structure, which can increase the rigidity of the car body and improve NVH performance, and at the same time, it can quickly transfer collision energy when a collision occurs, reduce the intrusion of the passenger compartment and protect the safety of the passengers.

　　The A-pillar, B-pillar and sill beam constitute the thermoformed steel door ring, which can bear higher pressure and improve the torsional stiffness and safety of the car body. At the same time, the steel door ring of hot car can also improve the sealing performance and torsional stiffness of the car body, improve NVH performance and enhance ride comfort.

　　The energy-absorbing box can reduce the maintenance cost of low-speed (20-30km/h) impact, because the energy-absorbing function of the energy-absorbing box can avoid the damage of the longitudinal beam, and the damaged energy-absorbing box can be replaced separately.

　　According to official data, compared with the design of only the front finger beam and the front longitudinal beam, the triple frontal collision-resistant energy-absorbing structure design of Binguo can achieve a 15% improvement in energy absorption efficiency.

　　There is also a steel anti-collision beam at the rear of Binguo, but there is no energy-absorbing box between it and the body. Even so, the existence of the anti-collision beam can disperse the impact energy of the rear collision, thus reducing the damage degree of the rear collision accident to the vehicle.

● Robust chassis

　　Binguo adopts the suspension combination of front McPherson and rear torsion beam, which is common at the same level. Simple structure, durable leather and low manufacturing cost are a major feature of this suspension form.

　　Compared with the open beam, the closed torsion beam with variable cross-section improves the stiffness of the torsion beam by 41% and the bearing capacity accordingly, thus reducing the vibration and improving the ride comfort.

　　According to the manufacturer’s introduction, Bingo’s chassis adjustment style is tough, that is, to ensure ride comfort on the basis of achieving good support of the car body. Therefore, bingo will be more stable when driving at high speed, giving people more sense of security, and emergency lane-changing vehicles can also provide good support. Binguo 410km Linxi Exclusive Edition uses a brand-new motor with better performance, and its top speed can reach 130km/h, which is higher than that of other models with 100km/h and 120km/h, so it is quite necessary to match a robust chassis.

　　Compared with the 175 and 165 tire widths commonly used in the same class, the wider tread of Bingo standard tires is beneficial to improve tire grip, make the vehicle run more stably, and ensure sufficient braking performance.

　　In addition to making great efforts to filter the vibration of the chassis to improve NVH performance, Bingo also made a fuss about the details such as the sealing and sound insulation measures of the passenger compartment. Both the front and rear side doors of Binguo have two complete sealing strips to ensure the tightness of the passenger compartment and avoid the introduction of environmental noise and wind noise into the car. At the same time, the sound-absorbing cotton of the front and rear outer wheel covers of Bingo is made of non-woven fabric +PP+PET+ non-woven fabric, which can effectively absorb the tire noise and the noise generated when the suspension system works.

● Water-cooled flat wire motor and refined battery

　　Binguo 410km Lingxi exclusive edition adopts water-cooled flat-wire permanent magnet synchronous motor, which is a three-in-one design and integrates motor, electronic control and differential.

　　Compared with the round wire motor, the slot fullness of the flat wire motor is increased by 20%, the contact area between the flat wires is larger, the heat conduction is better, and the heat dissipation capacity is stronger. The power density of the flat wire motor is increased by 0.8kW/kg, and the high efficiency range is expanded by 11%, thus making the maximum efficiency of the motor more than 96%.

　　We can see that there is a cooling water jacket on the stator shell of the motor, and the cooling liquid will circulate in the water jacket, taking away the heat generated when the motor works, and improving the continuous high power output performance and durability of the motor.

　　Wuling’s refined battery should be familiar to all of you. I introduced this battery in detail in the technical article of Wuling Starlight (click to view).

　　The battery core of Shenlian battery can not catch fire or explode in the acupuncture test; In the shallow needling test (the steel needle penetrates 1/3 of the battery thickness), the battery can still discharge normally; When the battery cell is extruded and deformed by external force up to 40%, it can not catch fire or explode. The safety performance at the cell level is quite eye-catching, which is also the key factor for the high safety of Bingo battery system.

　　At the level of battery pack, Shenlian battery adopts a structure called MUST, that is, Multifunctional Unitized Structure Technology, a multifunctional integrated battery pack structure technology. The biggest feature of this structure is that the cells are put into the reinforced frame and then installed into the battery pack. This reinforced frame can improve the structural strength of the battery pack by 60%.

　　Battery packs have suffered a lot in the laboratory, and it is common to go to the mountains and go to sea. The whole package of Shenlian battery has been tested by temperature change test, water immersion test, high temperature acupuncture test, vibration test, bottom dynamic impact test and charge-discharge test.

More exciting videos are all on the car home video platform.
"Needle Punching Test of Shenlian Battery Core"

　　Like mainstream electric vehicles on the market, Bingo’s BMS battery management system also supports Che Yun Intelligent Collaboration. In addition to real-time monitoring of battery status at the vehicle end, all-weather and life-cycle second-level safety inspection will also be carried out in the cloud. When the system detects battery collision, stabbing or overheating, it will actively remind the driver to prevent problems before they happen.

　　According to the manufacturer, this can reduce the maintenance cost by 90%. At the same time, Wuling has also strengthened the training of battery maintenance in the 4S after-sales service system. I believe that in time, its after-sales service outlets will be fully equipped with power battery maintenance capabilities. Compared with the power battery specialized service that can be seen in the market now, it is obvious that the official after-sales service can reassure consumers.

　　In this regard, I also asked the engineer at the dismantling site whether there will be batteries in the form of direct cooling or water cooling with refrigerant installed on Bingo. The engineer’s reply is vague and only means "on the road". Perhaps in the future, Bingo with more powerful electric drive system will use direct cooling or liquid cooling battery system with active temperature control function, which is worth looking forward to.

● Full text summary:

　　Wuling Binguo, as a pure electric small car, has done its homework in terms of cabin space utilization and safety, completely dispelling consumers’ concerns about small space and insecurity of small cars. At the same time, the affordable price of 59,800-88,800 yuan, combined with its fashionable and beautiful shape, is a good choice for buying food scooters in the near future. (Photo/Text/Photo/car home Chang Qinglin)

　　Corn is one of the crops with the largest sown area and the highest yield in China. Corn has a wide range of uses, not only as feed, but also for various industrial purposes, and provides high-quality protein and starch for human beings. The natural outcrossing rate of maize is as high as 95%, so hybrid seed production and special maize production need to be strictly separated. Conventional time and space isolation measures are time-consuming, laborious and difficult. How to realize corn non-isolated production in a scientific way is an urgent production problem. In general, both self-pollination and hybridization of maize can bear fruit, but there is a phenomenon that a few maize do not accept other maize pollen in nature, which is called unilateral cross-incompatibility (UCI) of maize. Some studies have reported three UCI loci, Ga1, Ga2 and Tcb1, which are composed of pollen and filament determinants respectively. According to the structure and function of UCI loci, maize in nature can be divided into three types: S type (Ga1-S, Ga2-S and Tcb1-S), which contains both pollen and filament determinant genes; M-type (Ga1-M, Ga2-M and Tcb1-M) only contains pollen determinant genes; Common types (ga1, ga2 and tcb1) contain neither pollen nor filament determinant gene. UCI controls the sexual transmission direction of haploid gametes and can be used for reproductive isolation between different types of maize.　
　　Chen Huabang, research group of Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, devoted himself to the study of maize one-way cross incompatibility, and reported the pollen and filament factor genes at Ga1 and Ga2 loci and their applications successively (Zhang et al., 2012；; Zhang et al., 2018，Chen et al., 2022； Cai et al., 2022）。 Recently, the team has once again made important progress in the study of maize incompatibility. In this study, the pollen determinant Tcb-m at Tcb1 locus was cloned. This is the "last" cloned determinant gene of maize incompatibility system. So far, all the key determinants of the three incompatibility sites have been cloned and verified, which laid the foundation for the study of commonness and specificity among maize incompatibility systems. On November 16th, related research results were published online in Plant Biotechnology Journal with the title of A Pollen Expressed PME Gene at TC B1 Locus Confers Maize Independent Cross-in Compatibility.　
　　It was found that the pollen factor Tcb1-M at TCB1 locus of maize encoded Pectin Methylesterases (PME), which was specifically expressed in the pollen of Tcb1-S materials. Studies have shown that the expression of Tcb1-m gene in common corn by transgenic method can make it pollinate and bear fruit for Tcb1-S type materials. Tcb1 locus and Ga1 locus are closely linked, and their pollen and filament factors are highly similar, and the two loci are in tandem repetitive relationship. However, Tcb1 locus only exists in the primitive ancestor of maize, and Ga1 locus exists in both maize and maize, which indicates that the two loci have differentiated and produced specificity after maize domestication. There are also a certain number of materials containing Ga1 or Ga2 loci in common corn in nature, which will reduce the application value of UCI loci in corn. In this study, the materials containing three sites were combined in different forms, and a polymer material containing two or three incompatible sites was created, which not only effectively hindered the pollen of ordinary corn, but also effectively prevented the risk of penetration of materials containing a single incompatible site, and further improved the application of corn incompatibility in non-isolated seed production. This study laid a material foundation for the mechanism analysis of incompatible systems.　
　　The research work is supported by the National Natural Science Foundation of China.　
　　Cloning and application of pollen factor gene at Tcb1 locus in maize