1,721,001 research outputs found
INTEGRATED POTENTIAL ASSESSMENT OF COMMUNITY-BASED ECOTOURISM IN DISTRICT A LUOI, THUA THIEN HUE PROVINCE
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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
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
CÁC HỢP CHẤT FLAVONOID TỪ CÂY LẠC TIÊN (Passiflora foetida L.) THU HÁI Ở THỪA THIÊN HUẾ
No full textFive flavonoid compounds: vitexin, vitexin 2ʹʹ-O-β-D-glucopyranoside, 2ʺ-O-rhamnosylvitexin, luteolin, and quercetin (1–5) were isolated from the leaves and stems of Passiflora foetida L. growing in Thua Thien Hue Province. Their chemical structures were elucidated by using nuclear magnetic resonance spectra as well as by comparing with the reported spectroscopic data. All the isolated compounds exhibited inhibitory activity against α-amylase and α-glucosidase enzymes with IC50 values ranging from 123.6–743.4 µg/mL and 166.3–423.4 µg/mL, respectively. The results show the potential application of P. foetida in developing products to support diabetes treatment.Năm hợp chất flavonoid, gồm vitexin, vitexin 2ʹʹ-O-β-D-glucopyranoside, 2ʺ-O-rhamnosylvitexin, luteolin và quercetin (1–5), đã được phân lập từ lá và cành của cây Lạc tiên sinh trưởng ở Thừa Thiên Huế. Cấu trúc hóa học của chúng được xác định dựa trên phổ cộng hưởng từ hạt nhân, kết hợp với so sánh dữ liệu phổ đã được công bố trước đây. Cả năm hợp chất phân lập được đều có hoạt tính ức chế enzym α-amylase và enzym α-glucosidase với giá trị IC50 lần lượt trong khoảng 123,6–743,4 µg/mL và 166,3–423,4 µg/mL. Kết quả nghiên cứu cho thấy tiềm năng ứng dụng của cây Lạc tiên trong phát triển sản phẩm hỗ trợ điều trị bệnh tiểu đường
Archaeal and bacterial diversity and community composition from 18 phylogenetically divergent sponge species in Vietnam
No full textSponge-associated prokaryotic diversity has been studied from a wide range of marine environments across the globe. However, for certain regions, e.g., Vietnam, Thailand, Cambodia, and Singapore, an overview of the sponge-associated prokaryotic communities is still pending. In this study we characterized the prokaryotic communities from 27 specimens, comprising 18 marine sponge species, sampled from the central coastal region of Vietnam. Illumina MiSeq sequencing of 16S ribosomal RNA (rRNA) gene fragments was used to investigate sponge-associated bacterial and archaeal diversity. Overall, 14 bacterial phyla and one archaeal phylum were identified among all 27 samples. The phylumProteobacteriawas present in all sponges and the most prevalent phylum in 15 out of 18 sponge species, albeit with pronounced differences at the class level. In contrast,Chloroflexiwas the most abundant phylum inHalichondriasp., whereasSpirastrellasp. andDactylospongiasp. were dominated byActinobacteria. Several bacterial phyla such asAcidobacteria, Actinobacteria, Bacteroidetes, Chloroflexi, Deferribacteres, Gemmatimonadetes, andNitrospiraewere found in two-thirds of the sponge species. Moreover, the phylumThaumarchaeota(Archaea), which is known to comprise nitrifying archaea, was highly abundant among the majority of the 18 investigated sponge species. Altogether, this study demonstrates that the diversity of prokaryotic communities associated with Vietnamese sponges is comparable to sponge-prokaryotic assemblages from well-documented regions. Furthermore, the phylogenetically divergent sponges hosted species-specific prokaryotic communities, thus demonstrating the influence of host identity on the composition and diversity of the associated communities. Therefore, this high-throughput 16S rRNA gene amplicon analysis of Vietnamese sponge-prokaryotic communities provides a foundation for future studies on sponge symbiont function and sponge-derived bioactive compounds from this region.</jats:p
Molecular taxonomy of some sponges (Demospongiae) using ribosomal (18s rrna) and partial mitochondrial (coi) genes
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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
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