Subjects: Library Science，Information Science >> Literature Work submitted time 2024-06-11
Abstract： Abstract: Purpose/Significance To systematically review the research trends of new quality productivity, deeply discuss the research hotspots and frontier issues, and reveal the research direction of new quality productivity. Method/Process CiteSpace software was used to analyze the research literature on new quality productivity. Result/Conclusion The results show that the research hotspots of new quality productivity are concentrated in the fields of scientific and technological innovation, digital economy, future industry, innovation-driven, data factors, etc. With the deepening of the research on new quality productivity and the continuous expansion of application fields, research institutions should continue to strengthen the theoretical and practical research on new quality productivity in the economic and social development, encourage multi-sectoral, multi-field and multi-disciplinary cross-research, and constantly optimize production relations to realize the transformation of old and new driving forces.
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Subjects: Biology >> Ecology submitted time 2018-03-14 Cooperative journals: 《生态学报》
Abstract：2015年7月，选取闽江河口鳝鱼滩的芦苇湿地、短叶茳芏湿地以及二者交错带湿地为对象，研究了两种植被空间扩展过程中植物-土壤系统全硫（TS）含量的空间变化特征。结果表明，不同湿地表层土壤的TS含量表现为交错带湿地 > 短叶茳芏湿地 > 芦苇湿地，其差异主要与两种植被的空间扩展改变了交错带湿地土壤的质地及有机质等参数，进而对硫的迁移及转化过程产生重要影响有关；交错带不同植被的根系分布及其对土壤硫养分的竞争导致土壤TS含量的水平和垂直变异性均较芦苇或短叶茳芏纯群落发生较大改变，其土壤的TS含量受芦苇根系分布的影响更为明显，含量和储量均在深层土壤中较高。芦苇与短叶茳芏的空间扩展改变了两种植被的株高、密度及生物量分配格局，尽管二者在交错带中的地下生物量分配比均高于纯群落，但芦苇地下空间占据能力要高于短叶茳芏。研究发现，芦苇与短叶茳芏的空间扩展是双向过程，二者在空间扩展中通过不同的硫养分吸收、累积与分配策略适应竞争环境，即交错带湿地中的芦苇通过增加根部对硫养分的累积能力来保持其竞争力，而短叶茳芏则通过拓展地上空间及提高地上器官的硫养分累积能力来抗衡芦苇的空间扩展。
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-21 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To investigate the effects of health Qigong Wuqinxi exercise on mild depression in college students and analyze the changes in hydrogen proton magnetic resonance spectra (1H-MRS) in the prefrontal cortex and hippocampus after the exercise. Methods Fifty-eight volunteer college students, including 30 with mild depression and 28 healthy students, were randomized into the intervention group and non-intervention group. The students in the intervention group were asked to practice health Qigong Wuqinxi training for 12 weeks and those in the non-intervention group did not engage in such training.For each subject, BECK Depression Self-reported questionnaire (BDI), Hamilton Depression rating scale (HAMD) score, and the metabolic parameters of 1H-MRS in the prefrontal cortex and hippocampus were evaluated before and after the intervention. Results Before the intervention, the scores of BDI and HAMD in the depression group were significantly higher than that in the control group (P<0.01), and were lowered obviously after the 12-week intervention (P<0.01). Compared with the control group, 1H-MRS in the depression group before intervention showed significantly increased NAA/Cr value in the left prefrontal cortex, Cho/Cr value in the bilateral hippocampus and the left frontal lobe, and Cho/Cr value of the left hippocampus and right frontal lobe (P<0.05) with significantly lowered NAA/Cho value in the bilateral prefrontal and Cho/ NAA value in the right hippocampus (P<0.05). After 12 weeks of intervention, NAA/Cr value in the bilateral hippocampus and the NAA/Cho value in the right hippocampus were significantly lowered (P<0.05), and NAA/Cho value in the right prefrontal and Cho/NAA value in the right hippocampus were significantly increased (P<0.05) in the depression group. Before the intervention, Pearson correlation analysis showed that the scores of HAMD and BDI were positively correlated with Cho/Cr value in the hippocampus and NAA/Cr value in prefrontal lobe (P<0.01) and inversely with NAA/Cho in prefrontal lobe and Cho/NAA value in the hippocampus (P<0.05); after the intervention, the scores of HAMD and BDI were positively correlated with NAA/Cr value in the hippocampus and Cho/Cr value in the left hippocampus (P<0.05). Conclusion Exercise of health Qigong Wuqinxi can reduce depression scale scores in patients with mild depression and improve the metabolic indexes (NAA/Cr and Cho/Cr values) in the prefrontal cortex and the hippocampus.
Subjects: Biology >> Botany >> Applied botany submitted time 2024-05-15 Cooperative journals: 《广西植物》
Abstract： The aerenchyma is an adaptive structure of Saussurea medusa in response to extreme environments, and its formation is usually accompanied by programmed cell death （PCD）. The death of cells and the formation of aerenchyma are typically regulated by the PAD4 gene （Phytoalexin deficient 4）. However, the mechanism by which SmPAD4 regulates the formation of aerenchyma in S. medusa remains unclear. In this study, S. medusa was used as the experimental material, and the gene SmPAD4 related to ventilation tissue formation was cloned by homologous cloning and RACE technology, and its sequence, phylogenetic evolution, expression and subcellular localization were analyzed, and its promoter was amplified by hi-1IL PCR technology to explore its function in environmental adaptation. The results were as follows:（1） The cDNA of SmPAD4 gene was successfully cloned with a total length of 2 047 （ GenBank accession number OR766038）, including an open reading frame of 1 866 bp, encoding 621 amino acids, a molecular formula of C3163H4906N848O910S26. The protein was an alkaline and hydrophilic unstable protein. （2）Phylogenetic tree analysis showed that SmPAD4 had high similarity with CcPAD4 of Cynara cardunculus. （3）A 1 049 bp promoter sequence of SmPAD4 was amplified, which included cis-acting elements such as light response element, hypoxia response element, methyl jasmonate response element, dry early, auxin response element and binding site of WRKY transcription factor.（4）Real-time quantitative fluorescence analysis showed that SmPAD4 gene was expressed in roots, stems and leaves, and the expression level was the highest in leaves. Under ultraviolet and hypoxia stress, the expression of SmPAD4 gene was up-regulated in leaves and stems, and down-regulated in roots. （ 5 ） Subcellular localization showed that SmPAD4 is distributed in the nucleus, cell membrane, and chloroplast. The results show that SmPAD4 gene has a unique protein domain and it responds to hypoxia and ultraviolet environmental stress, so it plays an important role in the formation of aerenchyma and the response to adversity stress. This study provides theoretical basis for further exploring the role of SmPAD4 gene in the environmental adaptation process of S. medusa.
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