Wild Orchids in Nepal PDF Download

Author: Kevin White
Publisher:
ISBN:
Category : Orchids
Languages : en
Pages : 324

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Book Description

Author: Mukesh Babu Chand
Publisher: GRIN Verlag
ISBN: 3668613117
Category : Science
Languages : en
Pages : 80

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Book Description
Master's Thesis from the year 2015 in the subject Biology - Botany, grade: -, , language: English, abstract: The inhibitory or delaying action of both the synthetic chemicals and naturally occurring phytochemicals against oxidative damage to tissues by free radicals produced in biological system of living organisms is known as antioxidant activity. Since some phytochemicals are responsible for biological as well as medicinal activities, nine wild orchids of Nepal were assessed for total polyphenolics and flavonoids content along with the antioxidant activity. The ethanolic extract of Eria graminifolia pseudobulbs, Gastrochilus acutifolius leaf and root, G. distichus whole plant, Luisia trichorhiza leaf and root, Otochilus albus pseudobulbs, Papillionanthe uniflora whole plant, Pholidota articulata leaf and pseudobulbs, Rhynchostylis retusa leaf, and Trudelia cristata leaf and stem were prepared by Soxhlet extraction. Phytochemicals were detected by previously established protocols with minor modifications. The total flavonoids were estimated with aluminium chloride method and total polyphenolics content with Folin-Ciocalteu phenol reagent method. Antioxidant activity was assessed by DPPH (2, 2-diphenyl-1-picryl hydrazyl) free radical scavenging assay. There was significant variation of total flavonoids, total polyphenolics content and antioxidant activity among the orchid extracts at P = 0.05. The total flavonoids varied with highest in Rhynchostylis retusa leaf (110.68 ± 4.52 mg QE/g) and lowest content in Gastrochilus acutifolius root (22.32 ± 1.10 mg QE/g); total polyphenolics with highest in Trudelia cristata stem (69.68±2.78 mg GAE/g) and lowest content in Gastrochilus acutifolius leaves (11.89±0.64 mg GAE/g). Also, the antioxidant activity varied with highest in Trudelia cristata stem (IC50 79.69 μg/ml) and lowest DPPH radical scavenging activity in Gastrochilus acutifolius leaf (IC50 341.79 μg/ml). However, none of the orchid extracts were as effective as quercetin – the reference compound – in radical scavenging activity (IC50 32.90 μg/ml). Total polyphenolics and flavonoids content and antioxidant activity of selected orchid extracts in this study were higher or lower than medicinal plant and orchid extracts of previous studies with considerable margin. Again, their antioxidant activity was positively associated with total flavonoids and total polyphenolics content. [...]

Author: Bhakta Bahadur Raskoti
Publisher:
ISBN: 9789937217262
Category : Orchids
Languages : en
Pages : 252

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Book Description

Author: Gloria D'Almada Barretto
Publisher:
ISBN: 9789838121361
Category : Orchids
Languages : en
Pages : 0

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Book Description

Author: K.K. Shrestha
Publisher: Scientific Publishers
ISBN: 9387991733
Category : Science
Languages : en
Pages : 673

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Book Description
Handbook of Flowering Plants of Nepal (Shrestha et al. 2018) is an updated version of 'Enumeration of the Flowering Plants of Nepal Vols. 1-3 (Hara et al. 1978-1982)' and 'Annotated Checklist of Flowering plants of Nepal (Press et al. 2000)' • Arrangement of orders and families, based on relationships on the basis of DNA sequences, according to Angiosperm Phylogeny Group (APG IV, 2016) Whereas, genera and species are arranged in alphabetical order • The book covers basic information on global biodiversity; vegetation, forest types and flora of Nepal • The Handbook of Flowering Plants of Nepal will be published in two volumes Volume 1 comprises 91 families (Cycadaceae – Betulaceae), 696 genera and ca. 3004 taxa (2857 species, 33 subspecies, 113 varieties, and 1 forma) of gymnosperms and flowering plants (nearly 40 percent species of Nepal flora) • It also includes 103 species of exotic species, and 137 species of doubtful or uncertain species • The volume two will comprise remaining species belonging to Coriariaceae–Apiaceae • Additional information includes information on Type specimen of endemic species of Nepal • Similarly, Nepali names, English names, life forms, elevation ranges, and general distribution are provided for each species • Furthermore, economic use values of most of the species (with parts use), and information on species with IUCN Red List category, and CITES Appendices are also provided. “This book represents a major stepping-stone on the pathway in completing the Flora of Nepal, and is an indispensible resource for anyone working on Nepalese plants”. Foreword: Dr. Mark F Watson, Editor-in-Chief, Flora of Nepal Royal Botanic Garden Edinburgh, UK.

Author: Keshab R. Rajbhandari
Publisher:
ISBN:
Category : Botany
Languages : en
Pages : 246

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Book Description

Author: Brendan Sayers
Publisher:
ISBN: 9781848891692
Category : Orchids
Languages : en
Pages : 0

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Book Description
A guide to the orchids of Ireland, for beginner and expert alike. With many photos and illustrations.

Author: Eng Soon Teoh
Publisher: Springer
ISBN: 3319242741
Category : Science
Languages : en
Pages : 753

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Book Description
This unique book brings together a wealth of data on the botanical, ethno-medicinal and pharmacological aspects of over 500 species of Asian medicinal orchids. It starts off by explaining the role and limitations of complimentary and herbal medicines, and how traditional Asian medicine differs from Western, “scientific” medicine. The different Asian medical traditions are described, as well as their modes of preparing herbal remedies. The core of the book presents individual medicinal orchid species arranged by genera. Each species is identified by its official botanical name, synonyms, and local names. Its distribution, habitat and flowering season, uses and pharmacology are described. An overview sums up the research findings on all species within each genus. Clinical observations are discussed whenever available, and possible therapeutic applications are highlighted. The book closes with chapters on the conservation of medicinal orchids and on the role of randomized clinical trials.

Author: Wei-Min Lin
Publisher:
ISBN: 9789868709829
Category : Orchid culture
Languages : en
Pages : 921

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Book Description

Author: Bo Mossberg
Publisher:
ISBN: 9780008210694
Category : Gardening
Languages : en
Pages : 0

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Book Description
A beautiful, richly illustrated book on Europe's wild orchids - perhaps the most enigmatic and popular group in the botanical world. The orchid family (Orchidaceae), numbering some 25,000 species, is one of the world's two largest families of flowering plants. Whilst the vast majority of orchids are found in the wet tropics, Europe accommodates c.130 native orchid species which are equally arranged in dense inflorescences of great beauty. Furthermore, the adaptations encountered in some of the European species are just as fascinating as those of their tropical relatives. This book provides an introduction to the native orchids of Europe. It features four sections: 'Structure and systematics', 'Orchids and the environment', 'Orchid portraits' and 'How to learn more'. This part constitutes the bulk of the book, presenting individual genera in a sequence which reflects their most likely evolutionary relationships. Each genus is introduced by one page of text and illustrated by one or more colour plates on the following pages. The text gives information on how to recognise the genus, where it is distributed, and the estimated number of species it contains - alongside information on the range of environmental requirements and flowering times in the European species. Depending on the genus, additional information may be found on topics such as pollination biology, associated fungi, evolutionary relationships or systematic problems. Beautiful watercolour artwork accompanies the text, making this an indispensable gift for anyone interested in the natural world. Not only is it a useful field guide, it is also a beautiful art book.