Do China＇s silk products only have advantage in number but no pricing power in international market？ In this paper, we used the residual demand elasticity model to estimate the international market power of China＇s...Do China＇s silk products only have advantage in number but no pricing power in international market？ In this paper, we used the residual demand elasticity model to estimate the international market power of China＇s silk products. The empirical results revealed that China＇s raw material products such as natural silk products and semi-finished products such as satin products had certain market power in the main export markets, but the finished silk products such as woman＇s blouse or shirts and shawls had no market power in the target markets including USA and Germany. The scale economy from resource endowment and great market share are the base of the international market power of natural silk products. The advantage from industry agglomeration and great market share are the source of the international market power of satin products. Technical bottlenecks and inefficiency in brand building are the cause of unobvious international market power of China＇s finished silk products, and the competition from Italy and France has increased the difficulty to enhance market power. In order to consolidate and improve the international market power of China＇s silk products, it is suggested to stabilize the production scale and strengthen industrial base, to speed up the resources integration and optimize the industrial distribution, to strengthen science and technology innovation and adjust product structure, to speed up the brand construction and enhance the influence of brand, and to enlarge the scale of organization and achieve scale economies.展开更多
IN antiquity, the earliest materials for weaving were flax and pueraria lobata. Women invented weaving and were the original weavers. They picked fibers of wild flax and wild pueraria Iobata and pressed them into thin...IN antiquity, the earliest materials for weaving were flax and pueraria lobata. Women invented weaving and were the original weavers. They picked fibers of wild flax and wild pueraria Iobata and pressed them into thin threads with a pottery or stone wheel. Then they wove the threads展开更多
The rise of the ancient Silk Road is a model of cross-nation production of space in early human history. During the Western Han Dynasty, after a passage way to the Western regions was "hollowed out" and secu...The rise of the ancient Silk Road is a model of cross-nation production of space in early human history. During the Western Han Dynasty, after a passage way to the Western regions was "hollowed out" and secured, commerce and trade along the route boomed, people started to form clusters, and towns and cities were established. Since the late Tang Dynasty, under the combined effects of natural disasters and manmade misfortunes, regions along the Silk Road in Northwest China were severely depopulated, the towns and cities declined, the ecological environment became fragile, and the social space in West China shrank dramatically. The West Development Strategy later launched by the People' s Republic of China had its focus on optimization and reconstruction of domestic social space, whereas the Belt and Road Initiative(referring respectively to "the Silk Road Economic Belt", hereinafter "the Belt", and "the 21 st-Century Maritime Silk Road", " the Road") is rooted in the planning of space for long-term development and production. In building the Belt and Road, we should take the initiative and necessary steps to manage sound top-level designs; further break down the space alienation emanating from the domestic administrative divisions, and stick to the policy of all around opening up; base the endeavor on the new types of urbanization and strengthen social construction to optimize spatial structures; pay attention to the leading role of space consumption by vigorously developing Silk Road tourism; enhance the transportation and communication infrastructure in the node cities to achieve seamless docking and deep-level integration of both social space and natural space along the Belt and Road.展开更多
Heterosis is a common phenomenon in plants and animals with diverse underlying mechanisms.Here,we applied two widely used silkworm hybrid systems and performed multi-omics analysis to identify possible intrinsic assoc...Heterosis is a common phenomenon in plants and animals with diverse underlying mechanisms.Here,we applied two widely used silkworm hybrid systems and performed multi-omics analysis to identify possible intrinsic associations between different hybrid strategies and epigenetic mechanisms with silkworm heterosis.We found significant differences in the silk gland transcriptomic landscape between the two systems,including differentially expressed genes and expression patterns in the hybrid offspring compared to their parents.In the quaternary hybrid system,hybrid vigor was primarily due to upregulated genes and the parent-dominant upregulated expression pattern,involving multiple transport processes,cellular nitrogen compound catabolism,glucose metabolism,and tricarboxylic acid cycle.In the binary system,hybrid vigor was mainly due to the down-regulated genes and transgressively down-regulated expression pattern,mainly involving basic nitrogen synthesis metabolism and body function.We also demonstrated that DNA methylation may affect hybrid vigor by regulating the expression of several heterosis-related genes.Thus,this study revealed two alternative mechanisms that may contribute to silkworm heterosis,both of which facilitate the efficient utilization of energy and nitrogen for silk production.展开更多
The fiber properties of modacrylic fibers with silk protein and spinning technology for blended knitting yarns are studied. By testing the fiber properties, fiber spinnability is analysed. Modacrylic fibers with silk ...The fiber properties of modacrylic fibers with silk protein and spinning technology for blended knitting yarns are studied. By testing the fiber properties, fiber spinnability is analysed. Modacrylic fibers with silk protein are brittle and have poor cohesion, so the key to process modacrylic fibers with silk protein lies in forming lap and sliver. During opening and carding, low speed is used to decrease fiber damage and the proper static resistant oil is applied to eliminate lapping fibers. Besides, the temperature and relative humidity have to be strictly controlled. The applications of modacrylic fibers with silk protein are also put forward.展开更多
Advanced DNA structures,such as the G-quadruplex(G4)and the i-motif,are widely but not randomly present in the genomes of many organisms.A G4 structure was identified in the promoter of the silk gland factor-1 gene(SG...Advanced DNA structures,such as the G-quadruplex(G4)and the i-motif,are widely but not randomly present in the genomes of many organisms.A G4 structure was identified in the promoter of the silk gland factor-1 gene(SGFI),which is the main regulatory gene for silk production in Bombyx mori.In this study,a BmSGF1 G4-/-ho-mozygous mutant was generated with the G4 sequence knocked out.The promoter activity of BmSGF1 was lowered in the BmSGF1 G4-/-mutant.Pyridostatin(PDS)stabilized the G4 structure and increased the promoter activity of BmSGF1,whereas anti-sense oligonu-cleotide(ASO)complementary to the G4 sequence suppressed the promoter activity of BmSGF1.Compared with wild-type larvae,the deletion of the BmSGF1 G4 structure de-creased both the expression of BmSGF1 and the fibroin heavy chain gene BmFib-H in the posterior silk gland and the weight of the cocoons.Overall,these results suggest that the promoter G4 structure of BmSGFI participates in the transcription regulation of the BmSGFl gene in the silkworm.展开更多
基金Supported by the Earmarked Fund for China Agriculture Research System(CARS-22)
文摘Do China＇s silk products only have advantage in number but no pricing power in international market？ In this paper, we used the residual demand elasticity model to estimate the international market power of China＇s silk products. The empirical results revealed that China＇s raw material products such as natural silk products and semi-finished products such as satin products had certain market power in the main export markets, but the finished silk products such as woman＇s blouse or shirts and shawls had no market power in the target markets including USA and Germany. The scale economy from resource endowment and great market share are the base of the international market power of natural silk products. The advantage from industry agglomeration and great market share are the source of the international market power of satin products. Technical bottlenecks and inefficiency in brand building are the cause of unobvious international market power of China＇s finished silk products, and the competition from Italy and France has increased the difficulty to enhance market power. In order to consolidate and improve the international market power of China＇s silk products, it is suggested to stabilize the production scale and strengthen industrial base, to speed up the resources integration and optimize the industrial distribution, to strengthen science and technology innovation and adjust product structure, to speed up the brand construction and enhance the influence of brand, and to enlarge the scale of organization and achieve scale economies.
文摘IN antiquity, the earliest materials for weaving were flax and pueraria lobata. Women invented weaving and were the original weavers. They picked fibers of wild flax and wild pueraria Iobata and pressed them into thin threads with a pottery or stone wheel. Then they wove the threads
基金one of the phased objectives of the Shaanxi Academy of Social Sciences' 2014 key research project "Social Construction of the Western China Society from the Production of Space Perspective"(Project No.:14ZD02)
文摘The rise of the ancient Silk Road is a model of cross-nation production of space in early human history. During the Western Han Dynasty, after a passage way to the Western regions was "hollowed out" and secured, commerce and trade along the route boomed, people started to form clusters, and towns and cities were established. Since the late Tang Dynasty, under the combined effects of natural disasters and manmade misfortunes, regions along the Silk Road in Northwest China were severely depopulated, the towns and cities declined, the ecological environment became fragile, and the social space in West China shrank dramatically. The West Development Strategy later launched by the People' s Republic of China had its focus on optimization and reconstruction of domestic social space, whereas the Belt and Road Initiative(referring respectively to "the Silk Road Economic Belt", hereinafter "the Belt", and "the 21 st-Century Maritime Silk Road", " the Road") is rooted in the planning of space for long-term development and production. In building the Belt and Road, we should take the initiative and necessary steps to manage sound top-level designs; further break down the space alienation emanating from the domestic administrative divisions, and stick to the policy of all around opening up; base the endeavor on the new types of urbanization and strengthen social construction to optimize spatial structures; pay attention to the leading role of space consumption by vigorously developing Silk Road tourism; enhance the transportation and communication infrastructure in the node cities to achieve seamless docking and deep-level integration of both social space and natural space along the Belt and Road.
基金supported by the National Natural Science Foundation of China(31371286,32070411,81872299,31830094,U20A2058)Guangzhou Science Technology Project(201904010007)+1 种基金Shenzhen Science and Technology Program(JCYJ20190807160011600,JCYJ20210324124808023)Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology(GDKCFY2101)。
文摘Heterosis is a common phenomenon in plants and animals with diverse underlying mechanisms.Here,we applied two widely used silkworm hybrid systems and performed multi-omics analysis to identify possible intrinsic associations between different hybrid strategies and epigenetic mechanisms with silkworm heterosis.We found significant differences in the silk gland transcriptomic landscape between the two systems,including differentially expressed genes and expression patterns in the hybrid offspring compared to their parents.In the quaternary hybrid system,hybrid vigor was primarily due to upregulated genes and the parent-dominant upregulated expression pattern,involving multiple transport processes,cellular nitrogen compound catabolism,glucose metabolism,and tricarboxylic acid cycle.In the binary system,hybrid vigor was mainly due to the down-regulated genes and transgressively down-regulated expression pattern,mainly involving basic nitrogen synthesis metabolism and body function.We also demonstrated that DNA methylation may affect hybrid vigor by regulating the expression of several heterosis-related genes.Thus,this study revealed two alternative mechanisms that may contribute to silkworm heterosis,both of which facilitate the efficient utilization of energy and nitrogen for silk production.
文摘The fiber properties of modacrylic fibers with silk protein and spinning technology for blended knitting yarns are studied. By testing the fiber properties, fiber spinnability is analysed. Modacrylic fibers with silk protein are brittle and have poor cohesion, so the key to process modacrylic fibers with silk protein lies in forming lap and sliver. During opening and carding, low speed is used to decrease fiber damage and the proper static resistant oil is applied to eliminate lapping fibers. Besides, the temperature and relative humidity have to be strictly controlled. The applications of modacrylic fibers with silk protein are also put forward.
基金This research was supported by the National Natural Science Foundation of China(31930102,32250710148,32000337,32100383)Shaoguan University high-level talent research start-up funding project(432/9900064607)Research Projects of Shaoguan University(SY2023KJ03).
文摘Advanced DNA structures,such as the G-quadruplex(G4)and the i-motif,are widely but not randomly present in the genomes of many organisms.A G4 structure was identified in the promoter of the silk gland factor-1 gene(SGFI),which is the main regulatory gene for silk production in Bombyx mori.In this study,a BmSGF1 G4-/-ho-mozygous mutant was generated with the G4 sequence knocked out.The promoter activity of BmSGF1 was lowered in the BmSGF1 G4-/-mutant.Pyridostatin(PDS)stabilized the G4 structure and increased the promoter activity of BmSGF1,whereas anti-sense oligonu-cleotide(ASO)complementary to the G4 sequence suppressed the promoter activity of BmSGF1.Compared with wild-type larvae,the deletion of the BmSGF1 G4 structure de-creased both the expression of BmSGF1 and the fibroin heavy chain gene BmFib-H in the posterior silk gland and the weight of the cocoons.Overall,these results suggest that the promoter G4 structure of BmSGFI participates in the transcription regulation of the BmSGFl gene in the silkworm.
