检索结果-南通市图书馆

Assessment of Diversity in the Genus Ficus L. (Moraceae) of k.terniaghat Wildlife Sanctuary, Uttar Pradesh, India

American Journal of Plant Sciences 2011年第1期2卷 78-92页

作者： Anoop k.mar Omesh Bajpai Ashish k. Mishra Nayan Sahu soumit k. behera L. B. Chaudhary 不详

The paper deals with the taxonomy and diversity within the genus Ficus occurring in k.terniaghat Wildlife Sanctuary based on extensive field and herbarium studies. The genus comprises 11 species in the study area contrary to the earlier report of 8 species. Out of which, one species each belongs to herbs (F. assamica) and straggling shrubs (F. hetero- phylla) and the remaining species to shrub to big free standing trees (F. benghalensis, F. hispida, F. palmata subsp. virgata, F. racemosa, F. religiosa, F. retusa var. nitida, F. rumphii, F. semicordata and F. squamosa). F. microcarpa and F. carica have been excluded as they do not occur in the sanctuary but reported in the previous work.due to mis- identification. F. repens has been segregated from F. heterophylla and reinstated as a distinct species with a correct name F. assamica. F. retusa var. nitida forms a new record for the sanctuary. In overall gross morphology, F. hispida, F. palmata subsp. virgata, F. assamica and F. heterophylla exhibit maximum diversity especially in their leaves, pe- duncles and figs. Among all species F. hispida has been found more common especially in low land and moist areas in mixed forest whereas F. retusa var. nitida has been seen with only two plants. All species have been critically examined and provided with correct nomenclature, vernacular name, description, phenology, ecology, uses and reference to voucher specimens. A dichotomous brack.ted k.y to the species along with line drawings has also been included for identification.

关键词： Ficus Taxonomy Diversity k.terniaghat Wildlife Sanctuary Moraceae

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of abiotic factors on understory community structures in moist deciduous forests of northern India

引用

Forestry Studies in China 2013年第4期15卷 261-273页

作者： Ashish k.MISHRA soumit k.behera k.ipal SINGH R.M.MISHRA L.B.CHAUDHARY Bajrang SINGH Plant Diversity Systematics and Herbarium Division CSIR-National Botanical Research Institute Department of Environmental Biology Awadesh Pratap Singh University Restoration Ecology Group CSIR-National Botanical Research Institute

Understory vegetation controls, in a significant way, the regeneration of overstory trees, carbon sequestration and nutrient retention in tropical forests. Development and organization of understory vegetation depend on climate, edaphic and biotic factors which are not well correlated with plant community structures. This study aimed to explore the relationships between understory vegetation and abiotic factors in natural and planted forest ecosystems. A non-metric multidimensional scaling(NMS) ordination technique was applied to represent forest understory vegetation among five forest communities, i.e., a dry miscellaneous forest(DMF), a sal mixed forest(SMF), a teak.plantation(TP), a low-land miscellaneous forest(LMF) and a savanna area(SAV) of the k.terniaghat Wildlife Sanctuary, located in northern India. Microclimatic variables, such as photosynthetically active radiation(PAR), air temperature(AT), soil temperature(ST), ambient atmospheric CO 2 concentration, absolute air humidity(AH), physical and chemical soil properties as well as biological properties were measured. Understory species were assessed via 100 random quadrats(5 m × 5 m) in each of the five forests in which a total of 75 species were recorded encompassing 67 genera from 37 families, consisting of 32 shrubs and 43 plant saplings. DMF was the most dense forest with 34,068 understory individuals per ha of different species, whereas the lowest understory population(13,900 per ha) was observed in the savanna. Ordination and correlation revealed that microclimate factors are most important in their effect compared to edaphic factors, on the development of understory vegetation in the various forest communities in the north of India.

关键词： vegetation structure microclimate ordination phytosociotogy understory vegetation

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

Advancing COVID-19 Diagnosis with CNNs: An Empirical Study of Learning Rates and Optimization Strategies

引用

Intelligent Control and Automation 2023年第4期14卷 45-78页

作者： Mainak.Mitra soumit Roy Product & Program (Data Platform) Conviva Foster City USA Presales Enngineering (Analytics) Jade Global San Jose USA

The rapid spread of the novel Coronavirus (COVID-19) has emphasized the necessity for advanced diagnostic tools to enhance the detection and management of the virus. This study investigates the effectiveness of Convolutional Neural Network. (CNNs) in the diagnosis of COVID-19 from chest X-ray and CT images, focusing on the impact of varying learning rates and optimization strategies. Despite the abundance of chest X-ray datasets from various institutions, the lack.of a dedicated COVID-19 dataset for computational analysis presents a significant challenge. Our work.introduces an empirical analysis across four distinct learning rate policies—Cyclic, Step Based, Time-Based, and Epoch Based—each tested with four different optimizers: Adam, Adagrad, RMSprop, and Stochastic Gradient Descent (SGD). The performance of these configurations was evaluated in terms of training and validation accuracy over 100 epochs. Our results demonstrate significant differences in model performance, with the Cyclic learning rate policy combined with SGD optimizer achieving the highest validation accuracy of 83.33%. This study contributes to the existing body of k.owledge by outlining effective CNN configurations for COVID-19 image dataset analysis, offering insights into the optimization of machine learning models for the diagnosis of infectious diseases. Our findings underscore the potential of CNNs in supplementing traditional PCR tests, providing a computational approach to identify patterns in chest X-rays and CT scans indicative of COVID-19, thereby aiding in the swift and accurate diagnosis of the virus.

关键词： Learning Rate AI Optimizer Deep Learning CNN Multi Class Classification

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Characterization of winged bean (<i>Psophocarpus tetragonolobus</i>(L.) DC.) based on molecular, chemical and physiological parameters

引用

American Journal of Molecular Biology 2013年第4期3卷 187-197页

作者： Chandra Sek.ar Mohanty Sushma Verma Vinayak.Singh Shahina k.an Priyank. Gaur Priya Gupta M. Abdul Nizar Nilamani Dik.hit Rojalin Pattanayak.Alpik. Shuk.a Abhishek. Niranjan Nayan Sahu soumit k.mar behera Tik.m Singh Rana CSIR-National Botanical Research Institute Rana Pratap Marg Lucknow Uttar Pradesh India National Bureau of Plant Genetic Resources Regional Station Akola Maharashtra India Sanjay Gandhi Institute of Post-Graduate Medical Sciences Lucknow Uttar Pradesh India University of Luck.ow Lucknow Uttar Pradesh India

Winged bean (Psophocarpus tetragonolobus (L.) DC.) is a potential legume crop of the tropics with high protein and oil content in the seeds. Analysis of the mutual genotypic relationships among twenty four genotypes of P. tetragonolobus through Mantel test found a significant correlation (r = 0.839) between similarity matrices of the results obtained from the use of the RAPD and ISSR molecular mark.rs. The UPGMA tree based on Jaccard’s similarity coefficient generated from their cumulative data showed two distinct clusters and seven sub-clusters among these accessions. Quantification of total polyphenols, flavonoids and tannin revealed the highest percentage of occurrence of k.empferol (1.07-790.5 μg/g) and the lowest percentage of gallic acid (0.09-3.49 μg/g) in the seeds. Phytochemical analysis of the winged bean genotypes revealed that, some of the exotic lines are distinct. Analysis of photosynthesis rate, photosynthetic yield and stomatal conductance data also showed two clusters and was in congruence with the phytochemical affinities of the genotypes. The overall high level of polymorphism and varied range of genetic distances across the genotypes revealed a wide range of genetic base of P. tetragonolobus. The present investigation therefore, has provided significant insights for further improvement of winged bean germplasm for its qualitative and quantitative traits.

关键词： Psophocarpus tetragonolobus Polyphenols Flavonoid RAPD ISSR Physiological Parameter

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

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

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

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：