检索结果-南通市图书馆

The chemical structures,biosynthesis,and biological activities of secondary metabolites from the culinary-medicinal mushrooms of the genus Hericium:a review

引用

Chinese Journal of Natural Medicines 2024年第8期22卷 676-698页

作者： QI Jianzhao WU Jing KANG Shijie GAO Jingming Hirokazu Kawagishi liu Hongwei liu Chengwei Key Laboratory for Enzyme and Enzyme-Like Material Engineering of Heilongjiang College of Life ScienceNortheast Forestry UniversityHarbin 150040China Shaanxi Key Laboratory of Natural Products&Chemical Biology College of Chemistry&PharmacyNorthwest A&F UniversityYangling 712100China Faculty of Agriculture Shizuoka UniversityShizuoka 422-8529Japan State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Fungal phytochemicals derived from higher fungi,particularly those from the culinary-medicinal genus Hericium,have gained significant attention in drug discovery and *** review aims to provide a comprehensive analysis of the chemical structures,biosynthetic pathways,biological activities,and pharmacological properties of monomeric compounds isolated from Hericium *** the past 34 years,253 metabolites have been identified from various Hericium species,including cyathane diterpenes,alkaloids,benzofurans,chromenes,phenols,pyrones,steroids,and other miscellaneous *** investigations into the biosynthesis of erinacines,a type of cyathane diterpene,have led to the discovery of novel cyathane *** research has highlighted the biological activities and pharmacological properties of Hericium-derived compounds,with particular emphasis on their neuroprotective and neurotrophic effects,immunomodulatory capabilities,anti-cancer activity,antioxidant properties,and antimicrobial *** A,in particular,has been extensively ***,transcriptomic,and proteomic analyses of Hericium species have facilitated the discovery of new compounds and provided insights into enzymatic reactions through genome *** diverse chemical structures and biological activities of Hericium compounds underpin their potential applications in medicine and as dietary *** review not only advances our understanding of Hericium compounds but also encourages further research into Hericium species within the realms of medicine,health,functional foods,and agricultural *** broad spectrum of compound types and their diverse biological activities present promising opportunities for the development of new pharmaceuticals and edible products.

关键词： Hericium Secondary metabolites Biological activity Biosynthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MECHANICAL ANALYSIS OF TREE SPARS IN CABLE YARDING SYSTEMS

引用

Journal of Northeast forestry university 1993年第2期4卷 103-111页

作者： Zhao ChenNanjing forestry university Nanjing forestry university China

Tree spars,as appropriate supports for cable yarding systems,have to beverified for the strength before any real *** paper gives theoretical analysisfor various *** spars without guylines are normally under heavy bending stress,which dominates the strength *** tree spars equipped with guylines,the spardeflection follows the same way as an unguyed *** overload of the bending stressremains the main reason of spar *** diversities of tree spars from theidealized condition are investigated for the sake of better modeling of the real *** supports that the tree spar can generally be treated as a straight cylindricalcolumn without giving significant *** load can be handled as centrically *** methods are provided for both guyed and unguyed tree spars,which will benefit thepractice of using tree spars as an alternative for steel spars.

关键词： Cable system Guyline Strength design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A STUDY ON THE RELATION BETWEEN SOIL AND NEEDLE CONTENT OF NUTRIENT ELEMENTS IN THE KOREAN PINE PLANTATION

引用

Journal of Northeast forestry university 1992年第1期3卷 95-100页

作者： Gong WeiguangNortheast forestry university Northeast forestry university China

Through the content analysis of nutrient elements in the soil and in the needle at thedifferent site classes and periods of growth of ***,and in a single growing season,someconclusions can be drawn below:Most of the soil nutrient elements were higher at the good sitesthan at the poor ones in an annua1 average concentration of them,i.e.,site class 1>site class2>site class *** for *** tree at every site class,the nutrient elements in their needles didthe ***,each of the elements in the soil or in the need was seldom at the same level ofconcentration on the good or on the poor site during different periods of *** are no aninevitable relationship between the contents of the soil nutrient elements and the needle’*** these elements are high or low within a tree body may depend on the physiogical require-ment of the tree,but not on their contents in the *** nutrient elements repuired *** varied with growth periods during a whole growing

关键词： nutrient varied seldom season RELATION needle drawn brown fertility body

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A STUDY ON THE PHYSICAL MECHANISM OF RESISTANCE OF MAIN POPLAR STRAINS AGAINST CRYPTORRHYNCHUS *** NORTH CHINA

引用

Journal of Northeast forestry university 1993年第1期4卷 91-106页

作者： liu Jingquan Hou Aiju Ding Fujun Northeast forestry university Northeast forestry university China

The physical mechanism of resistance of poplar against Cryptorrhynchus *** directly correlated with the morphological structure of bark,concerning the following 5aspects:*** is correlated with whether surface bark of larva transvered tunnel crack or not,ear-ly or *** that do not crack or crack late are susceptible strains while those that crack ear-ly are resistant *** is correlated with thickness of cork *** cork layer can in-crease resistance against pest while thin one is more susceptible to pest *** is related withage of *** at the age of 1-2 possess immunity to the pest,at 3-4 are relatively resistant,at5-8 are susceptible and over 9 are more *** is also correlated with the rate of trees‘healing round the holes of larva *** healing faster are resistant while those healingslower arc *** is related with the number of various scars on bark surface.

关键词： poplar susceptible tunnels crease faster concerning morphological cracking larvae immunity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Root Growth Potential and Energy Sources for New Root Growth of Three Conifer Species in Northern China

引用

北京林业大学学报 1993年第S3期 10-22页

作者： liu Yong Forest Resources College,Beijing forestry university

Seedlings of Pinus sylvestris var. mongolica, Larix principis—rupprechtii and Platycladus orientaliswere lifted from the nursery in March and transplanted to favorable growing conditions in a controlledenvironment chamber. The test of RGP showed that Platycladus orientalis seedlings had the greatest RGP amongthe three species, any one of the four parameters as TNR, TNR>1, TLR>1 and SAI could representthe RGP of Platycladus orientalis. However, at least two parameters (TNR and any one of TNR>1,TLR>1, SAI)must be used to represent the RGP of Larix principis—rupprechtii and Pinus sylvestris *** seedlings due to the weak correlation between root initiation and root elongation for the twospecies. The results of the RGP test and carbohydrate analysis for different treatments demonstrated thatcurrent photosynthate is needed for new root growth in Pinus sylvestris var. mongolica seedlings, whereasstored-carbohydrates provided the energy source for new root initiation. Current photosynthate is also neededfor root elongation in Larix principis — rupprechtii seedlings; New root growth of Platycladus orientalisseedlings is primarily caused by current photosynthate, but some reserve materials may be utilized at thesame time if photosynthesis is inadequate to meet growth demands.

关键词： root growth potential(RGP) current photosynthate stored carbohydrates

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ANALYSIS OF THE THERMOPHYSICAL PARAMETERS OF MOIST WOOD PARTICLE MATERIAL IN A COUPLED HEAT AND MASS TRANSFER PROCESS OF FREEZING BY USING FINITE ELEMENT METHOD

引用

Journal of Northeast forestry university 1991年第2期2卷 69-76页

作者： Shang DekuNortheast forestry university Northeast forestry university China

The coupled heat and moisture transfer in a freezing process of wood particle material was mathematically modeled in the paper. The models were interactively solved by using the numerical method(the finite element method and the finite difference method). By matching the theoretical calculation to an experiment, the nonlinear problem was analyzed and the variable thermophysical parameters concerned was evaluated. The analysis procedure and the evaluation of the parameters were presented in detail. The result of the study showed that by using the method as described in the paper, it was possible to determine the variable (with respect to temperature, moisture content and freezing state) thermophysical parameters which were unknown or difficult to measure as long as the governing equations for a considered process were available. The method can significantly reduces the experiment efforts for determining thermophysical parameters which arc very complicated to measure. The determined variable of the effective heat conductivity of wood particle material was given in the paper. The error of the numerical calculation was also estimated by the comparison with a matched experiment.

关键词： Finite element method Freezing process Coupled heat and mass transfer Variable thermophysical parameters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SITE CLASSIFICATION FOR PROTECTIVE FOREST AFFORESTATION ON THE COAST OF CHINA

引用

Journal of Northeast forestry university 1993年第2期4卷 18-32页

作者： Lin WendiNanjing forestry university Nanjing forestry university China

Land for protective forest on the coast has special site conditions, and site classification is the scientific basis for seaboard afforestation. The site classification system on the coast zone and islands of China may be classified into five levels-site region (sub - region), district, class, group, and type. The land division for afforestation is carried out by the principle of enviornmental heterogeneity among regions, sub-region and district on large scale, according to the difference of air temperature, moisture and type of coast geomorphy. It may be classified into 7 regions, 12 sub-regions and 55 districts. The medium and small scaled division for site class, group and type, subdivided in a site district, are based on medium topography, topographic climate, micro - relief and soil conditions.

关键词： Seaboard afforestation Coastal zone afforestation Site classification Coastal protective forest

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE ECO-GEOGRAPHICAL DISTRIBUTION OF FOREST INSECTS IN CHINA

引用

Journal of Northeast forestry university 1992年第2期3卷 13-22页

作者： Fang SanyangNortheast forestry university Northeast forestry university China

The ceo-geographical division of forest insects in China is generally divided into 4 levels: region, subrcgion, area and province. The region is formed by isolation of ocean, high mountain and desert etc. The division of subrcgion is on the basis of resistance of extreme temperature humidity in winter. The division of area or province is on the basis of landform, type of vegetation in forest zone and temperature zone.

关键词： Eco-geographical distribution Forest insect.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STUDY ON THE TEN MAJOR TREE SPECIES OCCUPYING GEOGRAPHICAL SPACE IN NATURAL SECONDARY FOREST USING SPACE ANALYSIS

引用

Journal of Northeast forestry university 1993年第2期4卷 51-56页

作者： Li RuxiuNortheast forestry university Northeast forestry university China

The paper studies ten major tree species occupying the space in naturalsecondary forests in Mao Er mountain *** space is divided into horizon,elevation,slope,aspect and topographic position *** features of the species of trees areexamined using the concept of distribution width and the method of space *** of analysis indicate that Aspen and Asian White Birch community of forests inthe area would become failing,and the distribution of Mongolian Oak and Mongolian Lidenand Manchurian Walnut are Limited by the slope and aspect and topographic ***,Maple,Manchurian Ash would become the major species constituting naturalsecondary forests in future in this area.

关键词： Species of tree Geographic space Distribution Space analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STUDY ON MEASUREMENT OF WOOD SURFACEROUGHNESS BY COMPUTER VISION

引用

Journal of Northeast forestry university 1992年第1期3卷 75-81页

作者： Zhao XuezengNortheast forestry university Northeast forestry university China

The working processes, machining devices and tools, cutting amount, consumption of materials, productivity and quality of products are directly affected by wood surface roughness. This paper gives an extensive review of methods used previously to measure wood surface roughness, and concludes that computer vision is the most suitable technique. The preliminary study shows that computer vision method has the advantages of a noncontact, three-dimensional measurement, high speed and well correlates with stylus tracing method. This method can be used in classification and in-time measurement of wood surface roughness after being improved.

关键词： Wood Surface roughness measurement Computer vision.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：