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regeneration status of riparian tree species in two sites that differ in land-use in the Okavango Delta,Botswana

Journal of Forestry Research 2017年第5期28卷 1073-1082页

作者： Gaolathe Tsheboeng Mike Murray-Hudson Keotshephile Kashe Okavango Research Institute

Human communities from the Okavango Delta benefit from the services and goods provided by the wetland ecosystem through its riparian vegetation. These include food and timber products used for the construction of shelter and canoes. Despite the importance of riparian tree species in the Delta, their regeneration structure is currently unknown. For riparian trees to be managed sustainably, information on the current regeneration status of the trees under different land uses is needed. The Moremi game reserve (protected area) and Seronga (communal area) were selected for this study on the regeneration of riparian tree species of Croton megalobotrys Müll. Arg, Philenoptera violacea (Klotzsch) Schrire, Senegalia nigrescens (Acacia nigrescens) Oliv and Diospyros mespiliformis Hochst. ex A. Dc. The height of each individual tree was estimated in randomly selected 30 plots (15 from each site) of 20 × 50 m for assignment to five regeneration classes: 0-0.5, 0.5-1, 1-2, 2-4 and >4 m. Linear regression was used to infer regeneration status of each species. An independent-sample Student’s t test was used to determine any significance differences in seedling density/ha and sapling density/ha between different sites at p regeneration structure in both sites, while P. violacea regeneration was stable regardless of land-use type. Croton megalobotrys and S. nigrescens had an unstable regeneration pattern in Seronga, while in Moremi it was stable; thus, the regeneration structure of C. megalobotrys and S. nigrescens is affected by land-use. This result implies that intervention is needed to conserve the two species in Seronga where the current land-use appears to be incompatible with regeneration; D. mespiliformis also needs to be conserved in both Moremi and Seronga.

关键词： Conservation regeneration Riparian Okavango and wetlands

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regeneration across Metazoan Phylogeny:Lessons from Model Organisms

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Journal of Genetics and Genomics 2015年第2期42卷 57-70页

作者： Qiao Li Hao Yang Tao P.Zhong State Key Laboratory of Genetic Engineering Department of GeneticsFudan University School of Life Science Department of Medicine Vanderbilt University School of Medicine

Comprehending the diversity of the regenerative potential across metazoan phylogeny represents a fundamental challenge in biology. Invertebrates like Hydra and planarians exhibit amazing feats of regeneration, in which an entire organism can be restored t^om minute body segments. Vertebrates like teleost fish and amphibians can also regrow large sections of the body. While this regenerative capacity is greatly attenuated in mammals, there are portions of major organs that remain regenerative. Regardless of the extent, there are common basic strategies to regeneration, including activation of adult stem cells and proliferation of differentiated cells. Here, we discuss the cellular features and molecular mechanisms that are involved in regeneration in different model organisms, including 14ydra, planarians, zebrafish and newts as well as in several mammalian organs.

关键词： regeneration Stem cells Dedifferentiation Model organisms Mammalian organs Tissue repair

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regeneration of hair cells in the mammalian vestibular system

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Frontiers of Medicine 2016年第2期10卷 143-151页

作者： Wenyan Li Dan You Yan Chen Renjie Chai Huawei Li Otorhinolaryngology Department Affiliated Eye and ENT Hospital State Key Laboratory of Medical Neurobiology Fudan University Shanghai 200031 China Key Laboratory of Hearing Medicine of the National Health and Family Planning Commission Shanghai 200031 China Research Center Affiliated Eye and ENT Hospital Fudan University Shanghai 200031 China MOE Key Laboratory of Developmental Genes and Human Disease State Key Laboratory of Bioelectronics Institute of Life Sciences Southeast University Nanjing 210096 China Co-Innovation Center of Neuroregeneration Nantong University Nantong 226001 China Institutes of Biomedical Sciences Fudan University Shanghai 200032 China

Hair cells regenerate throughout the lifetime of non-mammalian vertebrates, allowing these animals to recover from hearing and balance deficits. Such regeneration does not occur efficiently in humans and other mammals. Thus, balance deficits become permanent and is a common sensory disorder all over the world. Since Forge and Warchol discovered the limited spontaneous regeneration of vestibular hair cells after gentamicin- induced damage in mature mammals, significant efforts have been exerted to trace the origin of the limited vestibular regeneration in mammals after hair cell loss. Moreover, recently many strategies have been developed to promote the hair cell regeneration and subsequent functional recovery of the vestibular system, including manipulating the Wnt, Notch and Atohl. This article provides an overview of the recent advances in hair cell regeneration in mammalian vestibular epithelia. Furthermore, this review highlights the current limitations of hair cell regeneration and provides the possible solutions to regenerate functional hair cells and to partially restore vestibular function.

关键词： uncle hair cell regeneration Atohl Notch Wnt

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regeneration and Tree Species Diversity of Sitakund Botanical Garden and Eco-Park,Chittagong,Bangladesh

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Journal of Mountain Science 2014年第4期11卷 950-958页

作者： Rajasree NINDI Harald VACIK Institute of Forestry and Environmental Sciences (IFES) Chittagong University Department of Forest and Soil Sciences Institute of Silviculture University of Natural Resources and Life Sciences (BOKU) Peter Jordan Str. 82 A-1190 Vienna (Austria)

Anthropogenic disturbances influence plant regeneration and species diversity, which impact the conservation status of protected areas. A study was conducted in the Sitakund Botanical Garden and Eco-park （SBGE）, Chittagong, Bangladesh to analyze the natural regeneration and tree species diversity in disturbed and less disturbed zones. Stratified and systematic random sampling was used to select 50 sample plots from each of the two zones. A total number of 109 plant species from 43 families were recorded in the study; of which 93 species were of natural origin while the rest were planted. From the species with natural origin 66 were tree species, 9 were shrub species and 28 were climbers. Species richness, density of regeneration and disturbance index in the height classes （0- 0.5 m） and {dbh 〉 6 cm） indicated significant differences between the zones. The study analyzed how disturbances affect species diversity in the area. It was found that species richness and basal area are negatively related with disturbances. Moreover, density （N/ha） of trees was more likely to decrease with increasing tree height that reflects the huge demand of local people to harvest large trees as part of their income generating activities. The study findings have implications for future managementdecisions of the SGBE. To restore these ecosystems, management should focus on both biodiversity eonservation and providing benefits to local people without hampering forest ecosystems.

关键词： Human influence Species diversity Vegetation structure regeneration Disturbanceindex

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regeneration of thermally deactivated commercial V-W-Ti catalysts

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Frontiers of Chemical Science and Engineering 2012年第1期6卷 38-46页

作者： Xuesong SHANG Jianrong LI Xiaowei YU Jinsheng CHEN Chi HE Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China College of Chemical Engineering Huaqiao UniversityXiamen 361021China

An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 （l mol/L） and dilute H2SO4 （0.5 tool/L）, were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH4C1 had a higher activity than that of the catalyst treated by dilute H2SO4. The main reason is that the NH3 generated from the decomposition of NH4C1 at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V205 were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O2 is a factorthat suppresses the catalytic activity.

关键词： V2O5-WO3/TiO2 catalysts thermal deactiva-tion regeneration NH4C1 dilute H2SO4 solution

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regeneration of waste SCR catalyst by air lift loop reactor

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Journal of Central South University 2013年第5期20卷 1314-1318页

作者： LEE Jung-bin EOM Yong-seok KIM Jun-han CHUN Sung-nam Technology Commercialization Office Korea Electric Power Research Institute

A solution of 0.1 mol/L to 1.0 mol/L H2SO4 can dissolve alkali metals and alkaline earth metals which weaken an active site of SCR catalyst. The waste catalyst washed with 0.5 mol/L H2SO4 regained the best catalytic activity. When a concentration of the sulfuric acid is less than 0.5 mol/L, sufficient cleaning effects cannot be obtained. In contrast, when the concentration is greater than 1.0 tool/L, the active components, vanadium and tungsten are undesirably eluted. The total BET surface of the catalyst regenerated by air lift loop reactor showed almost the same as that of fresh catalyst due to the removal of insoluble compounds which may be penetrated into pores of catalyst. The addition of a solution of 0.075 mol/L ammonium vanadate （NHnVO3） and 0.075 mol/L ammonium paratungstate （5（NH4）20· 12WO3-5H20） to 0.1 mol/L H2SO4 significantly increases the activity of the waste catalyst.

关键词： nitrogen oxide regeneration selective catalyst reduction air lift loop reactor catalyst

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regeneration of the central nervous system-principles from brain regeneration in adult zebrafish

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World Journal of Stem Cells 2020年第1期12卷 8-24页

作者： Alessandro Zambusi Jovica Ninkovic Helmholtz Center Munich Biomedical CenterInst Stem Cell ResInstitute of Stem Cell ResearchDepartment of Cell Biology and AnatomyUniversity of Munich

Poor recovery of neuronal functions is one of the most common healthcare challenges for patients with different types of brain injuries and/or neurodegenerative *** interventions face two major challenges:(1)How to generate neurons de novo to replenish the neuronal loss caused by injuries or neurodegeneration(restorative neurogenesis)and(2)How to prevent or limit the secondary tissue damage caused by long-term accumulation of glial cells,including microglia,at injury site(glial scar).In contrast to mammals,zebrafish have extensive regenerative capacity in numerous vital organs,including the brain,thus making them a valuable model to improve the existing therapeutic approaches for human brain *** response to injuries to the central nervous system(CNS),zebrafish have developed specific mechanisms to promote the recovery of the lost tissue architecture and functionality of the damaged *** mechanisms include the activation of a restorative neurogenic program in a specific set of glial cells(ependymoglia)and the resolution of both the glial scar and inflammation,thus enabling proper neuronal specification and *** this review,we discuss the cellular and molecular mechanisms underlying the regenerative ability in the adult zebrafish brain and conclude with the potential applicability of these mechanisms in repair of the mammalian CNS.

关键词： Zebrafish Central nervous system Brain injury Glial scar regeneration Restorative neurogenesis Neural stem cells Inflammation

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regeneration of Simulated Deactivated Hollow Titanium Silicate Zeolite by Secondary Crystallization in the TPAOH Solution

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China Petroleum Processing & Petrochemical Technology 2017年第1期19卷 1-10页

作者： Xia Changjiu Lin Min Peng Xinxin Zhu Bin Xu Guangtong Shu Xingtian State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum Processing SINOPEC Beijing 100083

It is of paramount importance to improve the utilization efficiency of hollow titanium silicate(HTS) zeolite catalyst used in the cyclohexanone ammoxidation process. To achieve this aim, the regeneration of simulated deactivated HTS zeolite by post-synthesis was carried out in an aqueous TPAOH solution under hydrothermal conditions. It was found that the catalytic performance for phenol hydroxylation over regenerated HTS zeolite was as high as that of fresh *** from the BET measurements, electron micrography and XRD analysis results, it was confirmed that the topological and morphological structure was repaired. The chemical state of Ti species was detected by the UV-Vis and ^(29)Si MAS NMR spectroscopy. No acidic amorphous TiO_2-SiO_2 oxide was formed, and the extraframework Ti species could be reincorporated into the framework of HTS zeolite thanks to the tetrahedral coordination by the condensation between Ti-OH and Si-OH groups. In order to confirm this conclusion, the fresh HTS zeolite was treated under the NH_3·H_2O hydrothermal and thermal conditions for several times. The catalytic activity of both uncalcined and calcined simulated deactivated HTS zeolite samples could be regenerated without the formation of Br?nsted acid sites. It was concluded that the highly dispersed Ti species could be reincorporated into the framework of zeolite by hydrated condensation of Si-OH and Ti-OH groups after secondary hydrothermal synthesis.

关键词： hollow titanium silicate regeneration post synthesis TEM template

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regeneration and functional recovery of the completely transected optic nerve in adult rats by CNTF-chitosan

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Signal Transduction and Targeted Therapy 2023年第3期8卷 912-915页

作者： Xiao Liu Fei Hao Peng Hao Jingxue Zhang Liqiang Wang Si-Wei You Ningli Wang Zhaoyang Yang Kwok-Fai So Xiaoguang Li Department of Neurobiology School of Basic Medical SciencesCapital Medical University100069 BeijingChina School of Engineering Medicine Beijing Key Laboratory for Biomaterials and Neural RegenerationBeihang University100083 BeijingChina Beijing Tongren Eye Center Beijing Tongren HospitalCapital Medical UniversityBeijing Ophthalmology and Visual Sciences Key Laboratory100005 BeijingChina Department of Ophthalmology The Third Medical CenterChinese PLA General Hospital100089 BeijingChina Department of Ophthalmology Xijing HospitalThe Fourth Military Medical University710032 Xi’anShanxi ProvinceChina Guangdong-Hongkong-Macao Institute of CNS regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan University510632 GuangzhouGuangdong ProvinceChina Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) 510530 GuangzhouGuangdong ProvinceChina Department of Ophthalmology and State Key Laboratory of Brain and Cognitive Sciences The University of Hong Kong999077 Hong KongChina Center for Brain Science and Brain-Inspired Intelligence Guangdong-Hong Kong-Macao Greater Bay Area510515 GuangzhouGuangdong ProvinceChina Co-innovation Center of Neuroregeneration Nantong University226001 NantongJiangsu ProvinceChina Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural regeneration Beijing Advanced Innovation Center for Big Data-Based Precision MedicineBeihang University100083 BeijingChina

Dear Editor,The optic nerve,which belongs to the central nervous system(CNS),cannot regenerate when injured in adult mammals.1 Up to now,no readily translatable measures are available for repairing a severely injured optic *** we demonstrated that ciliary neurotrophic factor(CNTF)-chitosan enabled the reconstruction and functional recovery of the adult rat visual system,thus shedding light on the clinical potential for repairing the severely injured optic nerve.

关键词： regeneration functional CNTF

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regeneration ecology and population status of a critically endangered and endemic tree species (Ilex khasiana Purk.) in north-eastern India

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Journal of Forestry Research 2009年第3期20卷 223-228,286页

作者： Upadhaya Krishna Barik Saroj Kanta Adhikari Dibyendu Baishya Ratul Lakadong Nigyal John Division of Environmental Science Department of Basic Sciences and Social Sciences School of Technology North-Eastern Hill University Centre for Advanced Studies in Botany School of Life Sciences North-Eastern Hill University

Detailed studies on population structure and regeneration ecology of Ilex khasiana were carried out at five representative natural populations i.e. Mylliem (Population–I), Upper Shillong (Population–II), Shillong Peak (Population–III), Laitkor (Population–IV) and Nongpiyur (Population–V) to probe into the responsible affecting factors for its population structure and regeneration ability in these populations. Experimental observation under three controlled light conditions (full sunlight (100%), intermediate sunlight (50%) and low sunlight (30%)) showed that the growth status and survival rates of seedlings under intermediate and low light were better than those under the high light condition. The density-diameter distribution in population of adult trees (≥5cm dbh) exhibited a typical character of a regenerating population. A higher seedling mortality rate in natural populations of I. khasiana was most probably due to increase in light intensity following vegetation destruction and other anthropogenic disturbances that cause opening of forest canopy. The findings of the present study would be of immense value in formulating appropriate conservation measures for the species.

关键词： Ilex khasiana endangered species population status regeneration north-eastern India

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