摘要：
Enzymatic degradation of plastic is an effective means of plastic recycling and pollution control. However, the strong chemical inertness of polypropylene plastic (PP) severely impedes its oxidative cleavage, making it resistant to degradation. In this study, based on sequence screening of Hidden Markov Model (HMM), a dioxygenase (HIS1) was identified and characterized to be effective in PP oxidation. Various kinds of PP products, including plastic films, microplastics, and disposable water cups or bags, were HIS1-degraded with cracks and holes on the surface. The hydrophobic binding was the primary force driving oxidative degradation in the specific cavity of HIS1. The discovery of HIS1 achieved a zero breakthrough in PP biodegradation, providing a promising candidate for the selection and evolution of degrading enzymes.
摘要：
Enzymatic hydrolysis lignin residues (EHLRs) of lignocellulose usually adsorbs cellulase, which can be recycled and used to replace parts of cellulase in the hydrolysis process. To understand this phenomenon during enzymatic hydrolysis (EH) of sugarcane bagasse (SCB) treated with sulfite (SPORL) and dilute acid (DA), the adsorption characteristics between lignin and cellulase in EHLRs were investigated, focusing on interaction force at molecular level and enzymatic activity. The results revealed that SPORL-EHLR adsorbed more beta-glucosidases (beta-GLs) through the stronger electrostatic attraction and hydrogen bond force, causing higher cellulase adsorption amount compared to DA-EHLR. Further exploration demonstrated that the cellobiose's catalytic and binding sites on beta-GLs were separated from the binding site of SPORL-EHLR on beta-GLs, resulting in minimal in-hibition of beta-GLs activity when bound to SPORL-EHLR. Furthermore, adding SPORL-EHLR in SCB hydrolysis saved 40% cellulase. This study deepens the understanding of the adsorption behavior between lignin and cellulase.
摘要：
The coexistence of herbicide atrazine (ATZ) and the nanomaterial graphene oxide (GO) in natural water bodies will be an inevitable scenario due to their widespread application and consequent release into aquatic ecosystems. But the dissipation of ATZ with GO and the response of the microbial community to their combination are still not clear. Here, we investigated the dissipation dynamics and transformation of ATZ with and without GO in river water after 21-d incubation. In the presence of GO, ATZ residue significantly decreased by 11%-43%; the transformation of ATZ markedly increased by 11%-17% when ATZ concentrations were not above 1.0mg∙L(-1). The direct adsorption of ATZ on GO, mainly via π-π interactions, proton transfer and hydrogen bonding, contributed 54%-68% of the total increased ATZ dissipation by GO. ATZ and ATZ+GO exerted effects of similar magnitude on microbial OTU numbers with an increase of bacterial diversity. The coexisting GO increased the relative abundance of ATZ-degradation bacteria and Chitinophagales, thus improving ATZ transformation. This work indicated that the coexistence of GO at environmentally relevant concentrations can effectively reduce ATZ residues and promote the transformation of ATZ to degradation products in river water; nevertheless, the potential risk of GO acting as an ATZ carrier should be given more prominence.
作者机构：
[Chen, Sha; Du, Ci; Chen, Yao; Tang, Ying] Hunan Univ Technol, Coll Life Sci & Chem, Hunan Key Lab Biomed Mat & Devices, Zhuzhou 412007, Peoples R China.;[Wang, Tong; Zhang, Xin-Yi; Chen, Yao; Wang, Xiao-Zhi; Tang, Ying] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Peoples R China.;[Zhao, Han-Qing] Cent South Univ Forestry & Technol, Sch Sci, Inst Appl Chem, Changsha, Peoples R China.;[Chen, Sha] Zhuzhou City Joint Lab Environm Microbiol & Plant, Zhuzhou, Peoples R China.
通讯机构：
[Wang, T ; Chen, Y ; Chen, Y] H;Hunan Univ Technol, Coll Life Sci & Chem, Hunan Key Lab Biomed Mat & Devices, Zhuzhou 412007, Peoples R China.;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Peoples R China.
关键词：
Atractylodes macrocephala Koidz.;ensemble learning;gas chromatography - mass spectrometry (GC-MS);high-performance liquid chromatography - mass spectrometry (LC-MS);inductively coupled plasma - mass spectrometry (ICP-MS)
摘要：
The use of data fusion based with multiple analytical techniques was investigated to provide the accurate geographical origin identification of Atractylodes macrocephala Koidz. (AMK). Inductively coupled plasma - mass spectrometry (ICP-MS), gas chromatography - mass spectrometry (GC-MS) and liquid chromatography - mass spectrometry (LC-MS) were used to characterize Hubei, Zhejiang, and Hunan production regions. After the implementation of data fusion, the ensemble learning method multi-forest joint network (MFJN) and classic machine learning methods were used to identify the AMK production regions. The MFJN based upon high-level data fusion distinguished AMK samples from different regions with the highest accuracy. The classification accurate rate of AMK in the prediction set was 95%, which was significantly better than the results obtained using twenty-five mineral element or nine bioactive component data sets. The results showed that mass spectrometry data fusion in combination with MFJN is suitable for the geographic origin determination of AMK and has potential to ensure this product's fair trade.
摘要：
This work innovatively used cellulose nanofibers as a photocatalyst carrier, which could recycle nano-photocatalysts and minimize nanoparticle aggregation. The morphology, structures, chemical composition, optical-electronic properties and photocatalytic performance of amino-modified carbon quantum dots-ZnO/cellulose nanofiber (N-CQDs-ZnO/CNF: ZCH-2) hydrogel were characterized by SEM, TEM, BET, EDS, XRD, FTIR, UV-vis, XPS, PL and other techniques. The mechanism of Cr(VI) adsorption synergistic photoreduction by ZCH-2 was discussed in detail. The results showed that the prepared ZCH-2 had excellent removal performance for Cr(VI). After 120min of adsorption and 40min of photoreduction, the removal efficiency of Cr(VI) was 98.9%. Compared with ZnO/CNF hydrogel, the adsorption performance of ZCH-2 increased by 268% and the photoreduction performance increased by 116%. The adsorption of Cr(VI) by ZCH-2 was controlled by electrostatic attraction and chemical adsorption. The photoreduction kinetic constant of ZCH-2 was 0.106min(-1), which was 8.9 times that of ZnO/CNF hydrogel. The N-CQDs in ZCH-2 could form N-CQDs-metal complexes with Cr(VI), resulting in fluorescence quenching, so Cr(VI) could be visually identified by fluorescence changes. This study provides a new idea for the design and optimization of a new multifunctional hydrogel with efficient adsorption-photoreduction-fluorescence recognition.
摘要：
Characterized by irregular spatial and temporal variations of pollutant loading and complex occurrence mechanisms, agricultural nonpoint source pollution (ANPSP) has always been a great challenge in field restoration worldwide. Returning farmlands to wetlands (RFWs) as an ecological restoration mode among various constructed wetlands was selected to manage ANPSP in this study. Triarrhena lutarioriparia, Nelumbo nucifera and Zizania latifolia monocultures were designed and the water pollutants was monitored. N. nucifera and Z. latifolia could reach the highest TN (53.28%) and TP (53.22%) removal efficiency, respectively. By 16s high-throughput sequencing of rhizosphere bacteria, 45 functional species were the main contributors for efficient N and P removal, and 38 functional keystone taxa (FKT) were found with significant ecological niche roles and metabolic functions. To our knowledge, this is the first study to explore the microbial driving N and P removal mechanism in response to ANPSP treated by field scale RFWs.
摘要：
Tung oil derivatives are promising alternatives to traditional toxic plasticizers for improving the toughness of poly (lactic acid) (PLA) films. In this study, a tung oil-based quaternary ammonium salt (Q-ETO) was synthesized using a multi-step process involving epoxidation, ring opening, and substitution reactions. PLA based composite films with various amounts of Q-ETO were prepared by solvent casting. The impact of various amount of Q-ETO on PLA/Q-ETO composite films were evaluated with regard to their mechanical properties, hydrophilicity, water vapor permeability, optical properties, thermal stability, antibacterial properties, and leaching properties. The PLA/5%Q-ETO composite film yielded the highest elongation at break (82.52±9.53%), which was 153.67% higher than that of pure PLA. All PLA composite films showed an antibacterial efficiency exceeding 90% against both S. aureus and E. coli. Moreover, the PLA/Q-ETO composite film blocked the transmission of both ultraviolet and visible light while preventing the permeation of water vapor. The addition of Q-ETO only weakly affected the color and thermal stability of the PLA/Q-ETO composite film. Given the numerous advantages of the PLA composite film, it has significant potential for application as a food packaging material.
期刊：
Engineering Applications of Artificial Intelligence,2024年130:107774 ISSN：0952-1976
通讯作者：
Yi, JZ
作者机构：
[Yi, Jizheng; Yang, Ke; Chen, Aibin; Yi, JZ] Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.;[Yi, Jizheng; Chen, Aibin] Yuelushan Lab Carbon Sinks Forests Variety Innovat, Changsha 410000, Peoples R China.;[Jin, Ze] Tokyo Inst Technol, Inst Innovat Res, Lab Future Interdisciplinary Res Sci & Technol, Tokyo 2268503, Japan.
通讯机构：
[Yi, JZ ] C;Cent South Univ Forestry & Technol, Coll Comp & Informat Engn, Changsha 410004, Peoples R China.
关键词：
Scene text detection;Fully convolutional networks (FCN);Semantic segmentation network;Buffer region;Polygonal expansion
摘要：
Scene text detection has always been a research hotspot in computer vision and image understanding. With the development of deep learning, segmentation-based methods have achieved an exceptional effect in regular or curved text detection, but they cannot separate adjacent word-level texts. In this paper, we proposed a detector called Buffer-Text for the detection of irregular text in the natural scene image. First, the buffer region is proposed for bending text detection which widens the spatial distance between word-level texts. Then, a centerline-based polygon expansion algorithm is developed for the acquisition of the buffer region. After that, the scene text image is divided into different regions which are predicted by adopting the idea of multiclass semantic segmentation. To obtain effective segmentation results and solve the category imbalance problem, a Fully Convolutional Networks (FCN) with Spatial and Channel Squeeze & Excitation Block module is designed, and a loss function with adaptive weight updating is defined for the network. Ultimately, the post-processing including the total erosion and the single expansion is applied to eliminate the areas of noise in the segmented image and to separate the weak junctions in the word-level text. To verify the validity of the proposed method, several experiments were conducted on two curved text datasets, namely Total-Text and CTW1500, and the results indicated that the proposed method achieved significant accuracy in three statistical indicators (precision, recall, and F-score), particularly for the images with natural scenes and various text shapes.
期刊：
Forest Policy and Economics,2024年160:103146 ISSN：1389-9341
通讯作者：
Zhang, SH
作者机构：
[Zhang, Shouhong; Zhang, SH; Zhang, Fan; Ren, Yufei] Beijing Forestry Univ, Sch Soil & Water Conservat, Jixian Natl Forest Ecosyst Observat & Res Stn, CNERN, Beijing 100083, Peoples R China.;[Li, Mo] Northeast Agr Univ, Sch Water Conservancy & Civil Engn, Harbin 150030, Heilongjiang, Peoples R China.;[Zhang, Shouhong; Zhang, SH] Beijing Forestry Univ, State Key Lab Efficient Prod Forest Resources, Beijing 100083, Peoples R China.;[Liu, Jiakai] Beijing Forestry Univ, Sch Ecol & Nat Conservat, Beijing 100083, Peoples R China.;[Cao, Yini] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Zhang, SH ] B;Beijing Forestry Univ, Sch Soil & Water Conservat, Jixian Natl Forest Ecosyst Observat & Res Stn, CNERN, Beijing 100083, Peoples R China.;Beijing Forestry Univ, State Key Lab Efficient Prod Forest Resources, Beijing 100083, Peoples R China.
关键词：
National Reserve Forest Project of China;Afforestation project;Carbon neutrality;Carbon sink;Carbon cost and price
摘要：
The National Reserve Forest Project (NRFP) is a forestry project launched by China in 2013 to ensure the safety of timber supply and create a carbon sink, which can contribute to China's future carbon neutrality goals. To evaluate the carbon neutral contribution and carbon sink benefits of the NRFP, it is necessary to estimate the carbon sink amount, carbon sink cost, and carbon sink price. A combined method, modified Hartman model, and Rubinstein-Stahl bargaining model were used to estimate and analyze the carbon sink amount, carbon sink cost, and carbon sink price of NRFPs from several typical NRFP zones to the nationwide level. Results show that: (1) if the yearly construction area of the NRFP keeps stable at 10.2 × 105 ha in the future, the carbon sink of NRFP will account for about 17.32%, 28.35%, and 80.00% of total carbon emissions in 2060 under low-, middle-, and high-policy scenarios, respectively, representing an increase compared to the current level of approximately 16%; (2) the weighted average carbon sink cost of NRFP is estimated to be 95.16 CNY/t CO2 e (lower than the average carbon sink cost of 150 CNY/t CO2 e), and several measures such as applying Public-private partnership investment (PPP), increasing project operation duration, and choosing construction areas with low farmland benefit can help further reduce carbon sink cost of NRRP; (3) the reasonable carbon sink price should fall between the carbon sink cost and marginal carbon emission reduction cost of enterprises, and increasing the carbon sink price has a positive impact on NRFP construction. NRFPs suffer economic losses in the present carbon trade market, but they will gradually become profitable with the rising carbon sink price in the future. Therefore, it is imperative to maintain or gradually expand the construction area, provide more financial support, and improve the carbon trading market of NRFPs.
摘要：
Helianthemum songaricum and H. ordosicum are two shrubs disjunctively distributed in Central Asia and northwestern China. For conservation purposes, we used genotyping by sequencing (GBS) to investigate the genetic diversity and genetic structure of their populations. Based on the GBS data, H. songaricum populations showed considerable genetic differences from H. ordosicum populations. Helianthemum songaricum populations also showed a stronger population genetic structure within the isolated valleys in the Tianshan Mountains than was seen in previous studies. We speculated that the two species may represent two cotemporal migration events between the Middle East and Central Asia/Ordos Plateau since the early Pliocene. Due to the intense uplift of the Tianshan Mountains in the late Pliocene, populations of H. songaricum were isolated in different valleys. Subsequently, the cold glacial climate during the Pleistocene intensified the in situ intraspecific differentiation of the species. Based on our single nucleotide polymorphism data, we propose habitat damage by anthropological activities, where the two species inhabit should be urgently prohibited by executive management. In addition, a nursery for germplasm resources should be urgently set up to culture adequate progenies for the purpose of expanding the populations.
作者机构：
[Yang, Lixue; Wang, Mingwei; Shan, Chengfeng; Yang, LX; Shen, Fangyuan] Northeast Forestry Univ, Sch Forestry, Natl Forestry & Grassland Adm, Engn & Technol Res Ctr Northeast Native Tree Speci, Harbin 150040, Peoples R China.;[Ji, Li; Ji, L] Cent South Univ Forestry & Technol, Sch Forestry, Changsha 410004, Peoples R China.;[Wang, Mingwei] Beijing Forestry Univ, Sch Forestry, Beijing 100083, Peoples R China.;[Yang, Yuchun] Jilin Prov Acad Forestry Sci, Changchun 130033, Peoples R China.
通讯机构：
[Ji, L ] C;[Yang, LX ] N;Northeast Forestry Univ, Sch Forestry, Natl Forestry & Grassland Adm, Engn & Technol Res Ctr Northeast Native Tree Speci, Harbin 150040, Peoples R China.;Cent South Univ Forestry & Technol, Sch Forestry, Changsha 410004, Peoples R China.
关键词：
Extracellular enzymes;Microbial metabolic limitation;Altitude;Soil depth;Stoichiometric ratio
摘要：
Mountain ecosystems have obvious variations in environmental factors at small spatial scales and thus provide a natural platform for investigating climate change. To investigate the characteristics of extracellular enzymes and microbial metabolic limitations in the hostile environmental conditions of cold temperate mountain ecosystems, soil physicochemical properties and enzyme activities were measured in the 0–10 cm and 10–20 cm soil layers of Larix gmelinii forests at elevations of 830 m, 950 m, 1100 m, and 1300 m. Our results showed that altitude and soil depth had a significant effect on 1,4-β-glucosidase, 1,4-β-N-acetyl-glucosaminidase, leucine aminopeptidase, and acid phosphatase activities. Extracellular enzyme activities decreased with increasing altitude and soil depth. The stoichiometric ratio of soil C-, N-, and P-acquiring enzymes after logarithmic transformation was 1:1.27:0.72 across all altitudes and soil depths. The metabolism of the microorganisms was mainly limited by C and N, and a high C limitation was observed at higher-altitude sites. With increased soil depth, the N limitation gradually weakened. Moreover, soil bulk density and pH were the main factors affecting extracellular enzyme activities and microbial nutrient constraints. Our study revealed that the carbon and nitrogen limitation of soil microbes was induced by the variation in soil factors in a cold temperate mountain forest ecosystem. This finding provides important insights into the mechanism of microbial metabolic limitation in the face of climate change.
通讯机构：
[Zhou, WR; Li, JZ ] B;[Li, C ] H;Beijing Forestry Univ, State Key Lab Efficient Prod Forest Resources, Beijing 100083, Peoples R China.;Beijing Forestry Univ, MOE Key Lab Wooden Mat Sci & Applicat, Beijing 100083, Peoples R China.;Beijing Forestry Univ, Beijing Key Lab Wood Sci & Engn, Beijing 100083, Peoples R China.
关键词：
epoxy polymeric siloxane nanoclusters;phenylboronicacid polymeric siloxane nanoclusters;hyperbranched;functional SM adhesive;toughness
摘要：
From an environmentally sustainable perspective, soybean meal (SM) adhesive presents an ideal alternative to petrochemical-based adhesives. Generally, strength and toughness are mutually exclusive for an adhesive. Hence, the creation of protein-based adhesives with high water-resistant strength of bonding, remarkable toughness, and multifunctionality remains a notable challenge. This study reports a dual hyperbranched siloxane nanocluster cross-linking strategy for creating SM-based adhesives with superior performance. In detail, synthesized hyperbranched epoxy siloxane nanocluster (ESN) and hyperbranched phenylboronic acid siloxane nanocluster (BPA@SN) were introduced into the SM matrix to establish a targeted cross-linking network between epoxy groups and protein chains as well as phenylboronic acid and polysaccharides. Meanwhile, the flexible Si-O segments within the hyperbranched siloxane facilitated energy dissipation, significantly boosting the adhesive toughness. After cross-linking modification, SM/ESN/BPA@SN-1 adhesive demonstrated outstanding dry bonding strength (2.04 +/- 0.18 MPa), water-resistant bonding strength (1.12 +/- 0.06 MPa), and toughness (18.5 +/- 4.02 kJ/m(3)). Moreover, the adhesive exhibited distinctly improved resistance to mold, thermal stability, and flame retardancy. Therefore, this new strategy of using functional hyperbranched siloxane nanoclusters and SM to design strong, tough, and multifunctional green and sustainable wood-based biomass adhesives provides new ideas for achieving green development.
关键词：
Chinese pangolin;CT;Histopathology;Immunohistochemistry;Infantile hemangioma
摘要：
Hemangiomas are a relatively common type of tumor in humans and animals. Various subtypes of hemangiomas have been described in the literature. The classification methods for hemangiomas differ between human and veterinary medicine, and the basis for tumor classification can be found in the literature. This study describes a tumor in the subcutaneous tissue of the right dorsum of an artificially rescued juvenile Chinese pangolin. Computed tomography (CT) examination yielded the preliminary diagnosis of a vascular malformation, and surgery was performed to resect the tumor. Histopathological examination showed that the tumor mainly was consisted of adipose tissue, capillaries, and spindle cells in the fibrous stroma. Immunohistochemistry showed the positive expression of CD31, CD34, α-SMA, GLUT1 and WT-1 in the tumor tissue, and the tumor was eventually diagnosed as an infantile haemangioma. The final diagnosis of infantile hemangioma was depended on the histopathological immunohistochemical and CT examination of the neoplastic tissue. This is the first report of infantile hemangioma in a critically endangered species Chinese pangolin.
期刊：
Theoretical and Applied Climatology,2024年155(1):117-129 ISSN：0177-798X
通讯作者：
Wang, HQ
作者机构：
[Wang, HQ; Liu, Xinyu; Wang, Hanqing; Zhu, Dongnan; Liu, Zhenming; He, Junyi] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Wang, HQ; Liu, Xinyu; Wang, Hanqing; Zhu, Dongnan; Liu, Zhenming; He, Junyi] Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang, Peoples R China.;[Wang, HQ; Wang, Hanqing] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha, Peoples R China.
通讯机构：
[Wang, HQ ] U;Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;Natl & Local Joint Engn Res Ctr Airborne Pollutant, Hengyang, Peoples R China.;Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha, Peoples R China.
关键词：
WRF;Deep learning;Downscaling
摘要：
The Weather Research and Forecasting (WRF) model improves the accuracy of climate prediction and obtains meteorological parameters for fine grids; however, fine-grid climate predictions for different time periods and regions often consumes a great amount of computational resources. In this letter, the Multi Residual Attention Generative Adversarial Network (MRA-GAN) is proposed based on the generative adversarial network; the technique is applied to restore a simulated image from a coarse-grid WRF model to a simulated image from a fine-grid WRF model. The fine-grid image generated by MRA-GAN is very similar to the original fine-grid image. When compared with Super-Resolution Wasserstein Generative Adversarial Network with Gradient Penalty (SRWGAN-GP), the average of peak signal-to-noise was improved by approximately 0.54dB, and the average structural similarity index was improved by approximately 3%. After comparing the downscaling results of temperature, wind speed, and relative humidity of various models with the original data, the results show that MRA-GAN has the highest correlation, the lowest data dispersion, and the smallest data error. The trained network model was able to efficiently transform the coarse-grid meteorological fields from different time periods and different simulation variables into fine-grid meteorological fields, and it greatly reduced the computational workload.
通讯机构：
[Ma, YL ] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Peoples R China.
关键词：
Joint denoising;Improved quaternion singular value decomposition;Fault diagnosis;Gear
摘要：
Singular value decomposition (SVD) has drawn increasing attention in recent years as an effective signal noise reduction method. However, it is inapplicable to multivariate signals with abundant fault information. Existing quaternion singular value decomposition (QSVD) can decompose multivariate signals simultaneously, but the methods based on QSVD dependent on the embedding dimension and reconstructed components order seriously, and they are not suitable to noisy signals. To solve the problem, a novel joint denoising method improved quaternion singular value decomposition (IQSVD) is proposed, which can determine two parameters adaptively. Firstly, to select the embedding dimension, the improved power spectral density (IPSD) is proposed with considering frequency features and time -domine traits together. And then the periodic intensity (PI) is used to determine the reconstructed components by searching the component composing the most abundant periodic part. Finally, combined with envelope spectrum analysis, the gear fault is diagnosed. The results of the gear simulated and experimental multivariate signals verify the effectiveness of proposed method.
作者机构：
[Peng, Chuan-Chong; Wu, LJ; Wu, Li-Jun; Long, Fang; Zhang, Kai-Yi; Liu, Jin-Hui] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Long, Fang] ChangSha Commerce & Tourism Coll, Dept Hunan Cuisine, Changsha 410116, Peoples R China.;[Feng, Rui] Capital Normal Univ, Dept Chem, Beijing 100089, Peoples R China.
通讯机构：
[Wu, LJ ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
摘要：
A novel alkyl radical-initiated alkylsulfonylation of alkenes via copper carbene coupling is developed for the synthesis of various alkyl-alkyl sulfones by employing potassium metabisulphite (K2S2O5) as a connector. In this reaction, readily available K2S2O5 not only serves as a sulfur dioxide source but is also demonstrated to be an efficient reducing agent for promoting the catalytic cycle. Notably, the late-stage modifications of bioactive molecules including estrone and cholesterol derivatives utilizing this protocol could also be achieved. Mechanistic investigations reveal that the transformation involves intramolecular radical cyclization, insertion of "SO2" and the coupling of copper carbenes in a single reaction step. A novel alkyl radical-initiated alkylsulfonylation of alkenes involving copper carbene coupling is developed for the synthesis of various alkyl-alkyl sulfones by employing potassium metabisulphite (K2S2O5) as a connector.
摘要：
The cambial response of most plants varies with exposure to different environmental stresses, affecting their morphological and physiological features. The timing of cambial reactivation contributes to the quality of wood produced and the ability of plants to adapt to environmental conditions. Cambial structure and function provide insights into the genetic components or mechanisms underlying the secondary growth of plants. This study aimed to investigate how environmental stresses such as temperature, water, and phosphorus affect cambial activity mechanisms and xylem differentiation in different plant species. Under temperature regulation, cambial reactivation and xylem differentiation occur earlier in young cambium than in mature cambium, even under the same environmental conditions. Studies suggest that the cambial response to temperature regulation is related to the age of the cambium. During high heat waves and extended periods despite the rain, the number of new tracheids on trees seemed to decrease, and their radial diameters diminished. In low phosphorus (P) soils, the increasing timber density was therefore connected with the inhibited stem cambial activity, which resulted in a higher amount of photoassimilates for the secondary wall thickening of fibre cells. Under P deficiency, root anatomy changes with respect to stele diameter, root diameter, and meta-xylem vessels. Ultimately, changes in climatic conditions have a significant impact on the physiological characteristics of particular plant genera.
作者机构：
[Liu, Hong Y.; Yang, Qin] Cent South Univ Forestry & Technol, Forestry Biotechnol Hunan Key Labs, Changsha 410004, Peoples R China.;[Liu, Hong Y.; Yang, Qin] Cent South Univ Forestry & Technol, Key Lab Nonwood Forest Cultivat & Conservat, Minist Educ, Changsha 410004, Peoples R China.;[Luo, Dun; Huang, Han L.] Guangxi State Owned Bobai Forest Farm, Yulin 537600, Peoples R China.
通讯机构：
[Yang, Q ] C;Cent South Univ Forestry & Technol, Forestry Biotechnol Hunan Key Labs, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Key Lab Nonwood Forest Cultivat & Conservat, Minist Educ, Changsha 410004, Peoples R China.
关键词：
DNA phylogeny;systematics;taxonomy;tea-oil tree;two new taxa
摘要：
Tea-oil tree (Camelliaoleifera Abel.) is an important edible oil woody plant with a planting area over 3,800,000 hectares in southern China. Species of Diaporthe inhabit a wide range of plant hosts as plant pathogens, endophytes and saprobes. Here, we conducted an extensive field survey in Hainan Province to identify and characterise Diaporthe species associated with tea-oil leaf spots. As a result, eight isolates of Diaporthe were obtained from symptomatic C.oleifera leaves. These isolates were studied, based on morphological and phylogenetic analyses of partial ITS, cal, his3, tef1 and tub2 gene regions. Two new Diaporthe species (D.hainanensis and D.pseudofoliicola) were proposed and described herein.
作者机构：
[He, Mei; Wang, Hongjie; Guan, Jilun; Cheng, Fangchao; He, M] Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.;[Cheng, Fangchao] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Zhu, YQ; Zhu, Yanqiu] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, England.
通讯机构：
[He, M; Cheng, FC ] G;[Zhu, YQ ] U;Guangxi Univ, Sch Resources Environm & Mat, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, England.
摘要：
Flexible sensors have promising applications in the fields of health monitoring and artificial intelligence, which have attracted much attention from researchers. However, the design and manufacture of sensors with multiple sensing functions (like simultaneously having both temperature and pressure sensing capabilities) still present a significant challenge. Here, an ionic thermoelectric sensor for synchronous temperature and pressure sensing was developed on the basis of a carbon microtubes (CMTs)/potassium chloride (KCl)/gelatin composite consisting of gelatin as the polymer matrix, CMTs as the conductive material and KCl as the ion source. The designed CMTs/KCl/gelatin composite with the good ductility (830%) and flexibility can achieve a Seebeck coefficient of 4 mV K-1 and a dual stimulus responsiveness to pressure and temperature. In addition, not only the movement of the human body (e.g., fingers, arms), but also the temperature difference between the human body and the environment, were able to be monitored by the designed CMTs/KCl/gelatin sensors. This study provides a novel strategy for the design and preparation of high-performance flexible sensors by utilizing ion-gel thermoelectric materials and promotes the research of temperature and pressure sensing technologies. Design of a CMTs/KCl/gelatin composite by a facile dissolution process using gelatin, CMTs and KCl for a wearable pressure and temperature sensor.
