1,721,079 research outputs found
Orchidea Selangoreana - wild orchids of Selangor
No full textPublication based on real research findings and written in semi-scientific easy to read 210 pages containing 240 wild orchid species found in Selangor major forest reserves
The comparison between nuclear ribosomal DNA and chloroplast DNA in molecular systematic study of four sections of genus Dendrobium sw. (Orchidaceae)
Full text linkPhylogenetic study of the four sections (Aporum, Crumenata, Strongyle, and Bolbidium) of genus Dendrobium (family Orchidaceae) was conducted using molecular data. Classifications based on morphological characters have not being able to clearly divide these four sections neither do they supported their monophyly origin. Therefore, deeper and detailed analysis especially using molecular data is required to ascertain their status. Molecular evidences were used to clarify their relations either to lump them into one section or reduce them into two. The study has been carried out for the 34 species of Dendrobium using Maximum Parsimony (MP). Three nucleotide sequences data sets from two distinct genomes chloroplast DNA genes (rbcL and matK) and nuclear ribosomal DNA (ITS) were used to construct cladograms. The results that obtained from the Internal Transcribed Spacer (ITS) gene showed that the nuclear genes are reliable marker for the phylogenetic study of Dendrobium compared to chloroplast DNA with low resolution level among sections
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
An update on orchid diversity in Malaysia, threat, conservation status and challenges in a changing climate
Full text linkOrchidaceae is one of the largest angiosperm families found in Malaysia. Botanical exploration for orchids in various forests and vegetation types since 1999 to date have revealed tremendous changes in species diversity and distribution in Malaysia, being home for more than 4000 species of wild orchids with numbers still increasing today. New species to science and new records to Malaysia numbered between 10-20 new species and up to 50 new records were published yearly since 2010. From my team’s account, a total of 47 species are identified as new record to Peninsular Malaysia, which increased the total number to 1103 species in 155 genera of orchids. From these, more the 23% are endemic to Peninsular Malaysia and more than 400 species endemic to Sabah and Sarawak. As studies of orchid diversity continues, the number of species are doomed to change, it might increase in the future if more currently inaccessible vegetation are botanized and more specimens are collected, or it might decreases if rare and endemic species are vanishing due to habitat destruction and conversion to other land use. Apart from these, taxonomic and nomenclature study, too could affect the number of species. It decreases if some are reduced to synonymy or increase if some are raised from varieties, form, or subspecies to species or species complex identity is resolved into multiple genera or species. The environmental condition fluctuations or local climate change could increase or decrease this number, as some species flourished to certain changes; nevertheless some might succumb and lost forever. Major threats like deforestation, conversion of land use, over collecting of flagship species; uncontrolled borderless trades are making it almost impossible to determine the actual species diversity. However, one of the most critical set back for orchid documentation and conservation assessment is due to lack of orchid taxonomists in Malaysia, where there are less than a handful of us. Therefore, species diversity enumerations, conservation status evaluation, conservation plans, and actions are still the countries major challenges while many species slipped out of the country untraced, perished or extinct in the wild without being known of their existence
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Monophyly of four sections of genus Dendrobium (orchidaceae): evidence from nuclear ribosomal DNA intrenal transcribed spacer (ITS) sequences
No full textEvolutionary relationship among four sections of the genus Dendrobium (Aporum, Crumenata, Strongyle and Bolbidium) were inferred from nucleotide sequence variation in nuclear ribosomal DNA of Peninsular Malaysia species. The Internal transcribed spacer (ITS) of nuclear ribosomal DNA from representative of 29 species of genus Dendrobium and two species of genus Bulbophyllum as out group were analyzed by polymerase chain reaction amplification and DNA sequencing. Data analyses have been carried out using Maximum Parsimony (MP) as a character based method by different software (PAUP*4. 0 B 10 and Mega 5). Parsimony analyses of sequences resulted in a well-resolved phylogeny. The data suggested that Internal Transcribed Spacer (ITS) is a reliable marker for the phylogenetic study of Dendrobium compared to previous studies using chloroplast DNA with low resolution level among sections. The results demonstrated that the four sections formed a monophyletic group and that it is best to recognise only one section instead of four. Based on ICBN rules, the name Aporum has a priority to be used for this new classification
Documentation of inherited knowledge on wild edible fungi from Malaysia
Full text linkThe gradual loss in traditional knowledge on wild edible fungi is a common phenomenon the world over, including Malaysia. A documentation of known edible fungi in Malaysia was executed, with the objective of salvaging traditional knowledge on the identification and edibility of these mushrooms, particularly from her village communities. Among those that have been successfully documented in this study were Cookeina and Galiella of the class Ascomycetes and Termitomyces, Schizophyllum, Hygrocybe, Lentinus, Calvatia, Calostoma and Auricularia, from the Basidiomycetes which make up a total of 13 or 14 species belonging to 9 genera. It is hoped that this documentation will contribute towards an updated scientific identification, including their genetic sequences in the near future
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