中国林产工业产业关联与波及效应分析——基于投入产出模型的国际比较     

于畅  张华星  王溦兰  张倩  程宝栋  陶晨露 《世界林业研究》2020,33(5):76-81

文中基于中国、美国、俄罗斯、印度、巴西、印度尼西亚6国2000—2014年投入产出数据，通过测算中间需求率、中间投入率、感应度系数和影响力系数，对林产工业产业关联与波及效应进行动态比较分析。研究结果表明:相较于其他国家，中国木材加工业、造纸业的中间产品型产业特征明显，对国民经济贡献程度较高，但同时也面临成为“瓶颈产业”的风险；中国家具制造业的最终需求型产业性质显著，受整体经济发展的拉动作用明显弱于其他国家。总体而言，中国林产工业对国民经济的推动作用整体上高于国民经济发展对其的拉动作用。需要重点提升木材加工业、家具制造业整体产业链竞争力，加大科研创新投入力度以提升产出效率，并进一步提高家具制造业整体产品的附加值。  相似文献   

基于森林健康理念的森林康养产业发展研究     

谢中  付甫永  申修洪  王安良  严明贤 《绿色科技》2020,(3):135-137

阐述了森林健康理念和森林康养的基本概念,介绍了森林健康理念和森林康养的发展现状,分析了森林健康与森林康养产业之间的关系。结果表明:森林康养产业的理论基础就是基于森林健康理念继承发展来的,必然会促进森林健康产业的发展。运用森林健康理念指导森林康养产业发展是森林康养产业可持续发展的有效途径,森林健康理念在中国会不断完善和发展,也更有利于中国森林康养产业的发展。展望康养产业,会形成一种新的经济形态,成为国民福祉。  相似文献   

不利气象条件对果业生产的影响及果园管理建议     

高文胜  王海波  李明丽  李国栋  李林光 《落叶果树》2020,52(3):5-7

针对近年来不利气象条件频发情况,分析了不利气象条件对果业生产的影响,提出减轻不利气象条件对果树影响的建议和不利气象发生后果园的管理要点。  相似文献   

利用SOM聚类分析及主成分分析方法鉴定小麦品种萌发期耐盐性     

韩丽萍  郭卫卫  韩晓凡  李夕梅  王会芳  张玉梅  仇宏伟 《中国农学通报》2021,37(24):6-17

为了研究不同小麦品种萌发期的耐盐性,为小麦萌发期耐盐性鉴定提供快速、准确的鉴定方法和理论依据。本研究以40个冬小麦品种为试验材料,通过主成分分析法(PCA)与神经网络自组织映射(SOM)聚类分析法,研究盐胁迫对40个小麦品种萌发期各项形态指标的影响。主成分分析法结果表明,发芽势、发芽率、最长根长、第一片叶长及胚芽鞘长在PCA下载荷量最大;根据SOM聚类分析结果,‘德抗961’等4个小麦品种属于高度耐盐品种,‘济麦22’等14个小麦品种属于耐盐性品种,‘济麦20’等16个品种属于中等耐盐性品种,‘鲁麦21’等6个小麦品种属于盐敏感性品种。发芽势、发芽率、最长根长、第一片叶长、胚芽鞘长能够作为萌发期小麦耐盐性筛选的主要评价指标,并且结合主成分、SOM聚类分析方法进行小麦萌发期耐盐性鉴定更为科学、方便。  相似文献   

Three SNPs within exons of INHA and ACVR2B genes are significantly associated with litter size in Dazu black goats     

Shi-Zhi Wang  Guang-Xin E  Yan Zeng  Yan-Guo Han  Yong-Fu Huang  Ri-Su Na 《Reproduction in domestic animals》2021,56(6):936-941

The aim of this study was to analyse the association between single-nucleotide polymorphisms within INHA and ACVR2B and litter size in Dazu black goats. In total, twenty-two SNPs were genotyped in 190 individuals by SNaPshot and resequencing. The results showed that three SNPs (SNP_1, SNP_12 and SNP_13 in this study) were detected to have significant additive genetic effect on the recorded goat litter size (p < .05). The SNP_1 (NC_030809.1), a non-synonymous substitution of G for T at chr2-g. 28314990 in the exon 2 of INHA gene (NM_001285606.1), resulted in homozygote 2 (HOM2) contributed 0.25 and heterozygote (HET) contributed 0.12 larger litter than homozygote 1 (HOM1). Meanwhile, SNP_12 (Chr22-g. 11721225 A > T) and SNP_13 (Chr22-g. 11721227 A > C) (NC_030829.1) simultaneously mutated at the first and third position of a triplet AAA (lysine, K) in the exon 4 of ACVR2B gene (XM_018066623.1) had estimated genetic effects of HOM1 (0.00) and HOM2 (0.03) larger than HET (−0.12). In conclusion, one SNPs (chr2-g. 28314990 T > G) within the exon 2 of INHA and two SNPs (Chr22-g. 11721225 A > T and Chr22-g. 11721227 A > C) i n the exon 4 of ACVR2B gene were highly recommended as candidate markers of litter size in Dazu black goats. A large-scale association study to assess the impact of these variants on litter size is still necessary.  相似文献   

Screening and Verification of Low Nitrogen Tolerant and Nitrogen Sensitive Cotton Germplasm     

Wang Zhun  Zhang Hengheng  Dong Qiang  Gui Huiping  Wang Xiangru  Pang Nianchang  Li Yongnian  Niu Jing  Jin Dingsha  Wang Sujie  Zhang Xiling  Song Meizhen 《棉花学报》2021,32(6):538-551

[Objective] The aim of this study is to evaluate nitrogen efficient cotton germplasms and improve nitrogen use efficiency. [Method] Eighty cotton germplasms were selected and evaluated in the hydroponic experiment under low (0.25 mmol·L^－1) and high (5 mmol·L^－1) nitrogen concentration. Different traits for screening were identified and nitrogen use efficiency types were classified. Field experiments were also performed for comparison and confirmation of the identified germplasms. [Result] The results showed that there were significant differences in the total plant dry matter, shoot nitrogen accumulation and nitrogen absorption efficiency in cotton germplasms at the two nitrogen levels. Based on coefficient of variation, principal component analysis and correlation, six traits including total plant dry matter, shoot dry matter, root dry matter, total nitrogen accumulation, shoot nitrogen accumulation and nitrogen absorption efficiency were used as screening indicators. According to the Heatmap clustering analysis and the nitrogen efficiency comprehensive index, two germplasms (Lu05R59 and CCRI 69) were identified as low nitrogen tolerant and nitrogen efficient, and two germplasms (Coker 201 and Xinluzhong 30) as low nitrogen sensitive and nitrogen inefficient. The results of field experiment were consistent with the results of the hydroponic culture at the seedling stage. [Conclusion] It was finally determined that Lu05R59 and CCRI 69 were the low nitrogen tolerant and nitrogen efficient germplasms, and Coker 201 and Xinluzhong 30 were low nitrogen sensitive and nitrogen inefficient germplasms. The results of these studies provide the possibility for screening and rapid identification of nitrogen use efficiency in cotton at the seedling stage, and provide the ideal materials and theoretical basis for further study of cotton nitrogen efficient.  相似文献   

Regulatory role of l-proline in fetal pig growth and intestinal epithelial cell proliferation     

Jing Wang  Bi'e Tan  Jianjun Li  Xiangfeng Kong  Minjie Tan  Guoyao Wu 《动物营养（英文）》2020,6(4):438

l-proline (Pro) is a precursor of ornithine, which is converted into polyamines via ornithine decarboxylase (ODC). Polyamines plays a key role in the proliferation of intestinal epithelial cells. The study investigated the effect of Pro on polyamine metabolism and cell proliferation on porcine enterocytes in vivo and in vitro. Twenty-four Huanjiang mini-pigs were randomly assigned into 1 of 3 groups and fed a basal diet that contained 0.77% alanine (Ala, iso-nitrogenous control), 1% Pro or 1% Pro + 0.0167% α-difluoromethylornithine (DFMO) from d 15 to 70 of gestation. The fetal body weight and number of fetuses per litter were determined, and the small and large intestines were obtained on d 70 ± 1.78 of gestation. The in vitro study was performed in intestinal porcine epithelial (IPEC-J2) cells cultured in Dulbecco''s modified Eagle medium-high glucose (DMEM-H) containing 0 μmol/L Pro, 400 μmol/L Pro, or 400 μmol/L Pro + 10 mmol/L DFMO for 4 d. The results showed that maternal dietary supplementation with 1% Pro increased fetal weight; the protein and DNA concentrations of the fetal small intestine; and mRNA levels for potassium voltage-gated channel, shaker-related subfamily, member 1 (Kv1.1) in the fetal small and large intestines (P < 0.05). Supplementing Pro to either gilts or IPEC-J2 cells increased ODC protein abundances and polyamine concentrations in the fetal intestines and IPEC-J2 cells (P < 0.05). In comparison with the Pro group, the combined administration of Pro and DFMO reduced the expression of ODC protein and spermine concentration in the fetal intestine, as well as the concentrations of putrescine, spermidine and spermine in IPEC-J2 cells (P < 0.05). Meanwhile, the percentage of cells in the S-phase and the mRNA levels of proto-oncogenes c-fos and c-myc were increased in response to Pro supplementation, whereas depletion of cellular polyamines with DFMO increased tumor protein p53 (p53) mRNA levels (P < 0.05). Taken together, dietary supplementation with Pro improved fetal pig growth and intestinal epithelial cell proliferation via enhancing polyamine synthesis.  相似文献   

工业级棉短绒清理回收工艺的改进     

王如南  张军  霍永峰  袁新英  韩文杰 《中国棉花》2021,48(8):26-28

为降低棉短绒中的杂质含量，提高棉短绒的质量及收率，对棉短绒清理回收的生产工艺进行了改进，创新连续化多级除杂装备和短绒精细化分离工艺。棉籽清理除杂工艺中，增加了圆筛、棒条机，并且调整了风力清籽机组配置；短绒分离工艺中，增加了五联筛和新型棒条机。改进后的工艺能够提升对毛棉籽的除杂效果，彻底清理剥绒得到的棉短绒中的碎棉仁、棉壳及棉秆等杂质。此外，该工艺还能回收棉短绒下脚料，满足大型生产线的生产要求。  相似文献   

EPS364, a Novel Deep-Sea Bacterial Exopolysaccharide,Inhibits Liver Cancer Cell Growth and Adhesion     

Yun Wang  Ge Liu  Rui Liu  Maosheng Wei  Jinxiang Zhang  Chaomin Sun 《Marine drugs》2021,19(3)

The prognosis of liver cancer was inferior among tumors. New medicine treatments are urgently needed. In this study, a novel exopolysaccharide EPS364 was purified from Vibrio alginolyticus 364, which was isolated from a deep-sea cold seep of the South China Sea. Further research showed that EPS364 consisted of mannose, glucosamine, gluconic acid, galactosamine and arabinose with a molar ratio of 5:9:3.4:0.5:0.8. The relative molecular weight of EPS364 was 14.8 kDa. Our results further revealed that EPS364 was a β-linked and phosphorylated polysaccharide. Notably, EPS364 exhibited a significant antitumor activity, with inducing apoptosis, dissipation of the mitochondrial membrane potential (MMP) and generation of reactive oxygen species (ROS) in Huh7.5 liver cancer cells. Proteomic and quantitative real-time PCR analyses indicated that EPS364 inhibited cancer cell growth and adhesion via targeting the FGF19-FGFR4 signaling pathway. These findings suggest that EPS364 is a promising antitumor agent for pharmacotherapy.  相似文献   

Development of a core set of KASP markers for assaying genetic diversity in Brassica rapa subsp. chinensis Makino     

Peirong Li  Tongbing Su  Huiping Wang  Xiuyun Zhao  Weihong Wang  Yangjun Yu  Deshuang Zhang  Changlong Wen  Shuancang Yu  Fenglan Zhang 《Plant Breeding》2019,138(3):309-324

Single‐nucleotide polymorphisms (SNPs) are rapid, economical and reliable genotyping tools. Non‐heading Chinese cabbage (Brassica rapa L. subsp. chinensis Makino) is now an economically important vegetable crop worldwide. In this study, 1,167 SNPs were evaluated for 7polymorphism among 70 representative non‐heading Chinese cabbage inbred lines using a Kompetitive Allele Specific PCR (KASP) genotyping assay. On the basis of identified polymorphisms and the results of a principal component analysis, we selected 50 core SNPs that were balanced sufficiently to provide adequate information for genetic identification. The core SNPs were used for construction of a neighbour‐joining dendrogram that separated the 70 inbred lines into four main groups and several subgroups corresponding to Caixin, Heiyebaicai, Huangxinwu, Naibaicai, Taitsai, Pak‐choi, and Wutatsai. This categorization was superior to that achieved using a dataset of 479 polymorphic SNPs. To confirm the utility of the core SNP markers in genetic identification, we tested their stability and resolution using 162 commercial hybrid cultivars. The SNPs, which represent a cost‐effective, accurate marker set for germplasm analysis and cultivar identification, are suitable for molecular marker‐assisted breeding in non‐heading Chinese cabbage.  相似文献