Ho Chi Minh City, Vietnam
Ho Chi Minh City, Vietnam

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Leong-Skornickova J.,The Herbarium | Ly N.-S.,Institute of Tropical Biology | Poulsen A.D.,University of Oslo | Tosh J.,Royal Botanic Garden Edinburgh | And 2 more authors.
Taxon | Year: 2011

A new genus of Zingiberaceae from Vietnam, Newmania N.S. Lý & Škorničk., with two species Newmania serpens N.S. Lý & Škorničk. and N. orthostachys N.S. Lý & Škorničk., is described and illustrated. Its relationship with Haniffia Holttum and phylogenetic position in the tribe Zingibereae is investigated using nrITS and trnK and matK plastid sequence data. The phylogenetic position of Kedhalia C.K. Lim, another recently described ginger genus from the same tribe, is also discussed briefly.

Bruggeman P.,Zwarte Ring 157 | Vuong T.B.,Institute of Tropical Biology | Rybkova R.,Prague Botanical Garden | Ponert J.,Prague Botanical Garden | Ponert J.,Charles University
Nordic Journal of Botany | Year: 2013

Arisaema claviforme P. Bruggeman, T. B. Vuong, R. Rybková & J. Ponert, a new species of Araceae, belonging to section Anomala, from Hòn Bà Nature Reserve, Khánh Hòa province in southern Vietnam is described, illustrated and compared with related taxa. Additionally, Arisaema simaicum Gagn., a species hitherto regarded as an endemic to southern Thailand is published as a new record for Vietnam and a short description and an illustration of this species is provided. © 2013 The Authors.

Averyanov L.V.,RAS Komarov Botanical Institute | Tanaka N.,98 11 Otsuka | Nguyen K.S.,CAS South China Botanical Garden | Truong B.V.,Institute of Tropical Biology | And 2 more authors.
Nordic Journal of Botany | Year: 2016

Five new species named Peliosanthes aperta, P. elegans, P. kenhillii, Tupistra densiflora and T. patula are described and illustrated. These species are very local in distribution and endemic to northern or southern Vietnam. Two other species, Ophiopogon ogisui and Peliosanthes griffithii, are recorded as new to the flora of Vietnam. A key to the species of Tupistra occurring in Indochina and its neighboring regions is also provided. © 2016 Nordic Society Oikos.

Millet J.,University Claude Bernard Lyon 1 | Truong L.H.,Institute of Tropical Biology
Tropical Conservation Science | Year: 2011

Conservation of biodiversity and of endangered tree species in tropical forests represents a challenge in the era of deforestation and overlogging. Assessments of biodiversity and of conservation species are essential to estimating the conservation value of ecosystems in order to develop appropriate management measures. This paper discusses the floristic composition, the diversity, and the regeneration of the conservation species in a logged forest in southern Vietnam. Twenty five one hectare plots have been set up using circular sub-plots of 8 metres diameter and at a distance of 10m from the centre point of other sub-plots. The sampling is approximately 50% in each plot. Ten years after the last logging, the species richness appears low, when compared with the close protected area, but the diversity is quite high and conservation species still occur. Twelve conservation species have been studied from the point of view of their distribution and regeneration. Some are close to extinction but some others show promise in terms of regeneration. Six floristic groups have been identified and, among them, two are of interest from a conservation point of view. This logged forest still has a high conservation value, and the process that aims at developing protection measures is clearly relevant. © J. Millet and Luu Hong Truong.

Dang V.-S.,Institute of Tropical Biology | Tagane S.,Kyushu University | Toyama H.,Kyushu University | Tran H.,University of Science
Annales Botanici Fennici | Year: 2015

Lasianthus yaharae V.S. Dang, Tagane & H. Tran (Rubiaceae) is described and illustrated here based on material discovered in the Hon Ba Nature Reserve, southern Vietnam. It is most similar to L. dalatensis but differs in having fewer secondary veins in the leaves, a larger calyx and larger flowers (corolla tube and corolla lobes), and a different flower color at anthesis. © 2015 Finnish Zoological and Botanical Publishing Board.

Nguyen H.D.,Ho Chi Minh City University of Natural Sciences | Trinh B.T.D.,Ho Chi Minh City University of Natural Sciences | Nguyen N.K.,Ho Chi Minh City University of Natural Sciences | Dang S.V.,Institute of Tropical Biology | And 2 more authors.
Phytochemistry Letters | Year: 2011

Three new xanthones, 1,3,7-trihydroxy-2-(2-hydroxy-3-methylbut-3-enyl)-4- (3-methylbut-2-enyl)xanthone (1), 8-hydroxy-1,2,3-trimethoxyxanthone (2), and 3-O-methylmangostenone D (3), together with (13E,17E)-polypoda-8(26),13,17,21- tetraene-3β-ol, δ-tocotrienol, cochinchinone A, β-mangostin, 1,6-dihydroxy-5-methoxyxanthone, 1-hydroxy-5,6-dimethoxyxanthone, and blancoic acid, were isolated from the twigs of Cratoxylum cochinchinense. Their structures were determined using mainly 2-D NMR techniques. © 2010 Phytochemical Society of Europe.

Pham T.-L.,University of Tsukuba | Pham T.-L.,Institute of Tropical Biology | Shimizu K.,Toyo University | Dao T.-S.,Ho Chi Minh City University of Technology | And 2 more authors.
Toxicology Reports | Year: 2015

We investigated the accumulation and adverse effects of toxic and non-toxic Microcystis in the edible clam Corbicula leana. Treated clams were exposed to toxic Microcystis at 100μg of MC (microcystin)-LReqL-1 for 10 days. The experimental organism was then placed in toxin-free water and fed on non-toxic Microcystis for the following 10 days for depuration. Filtering rates (FRs) by C. leana of toxic and non-toxic Microcystis and of the green alga Chlorella vulgaris as a control were estimated. Adverse effects were evaluated though the activity of catalase (CAT), superoxide dismutase (SOD) and glutathione S-transferase (GST). Clam accumulated MCs (up to 12.7±2.5μgg-1 dry weight (DW) of free MC and 4.2±0.6μgg-1 DW of covalently bound MC). Our results suggest that although both toxic and non-toxic cyanobacteria caused adverse effects by inducing the detoxification and antioxidant defense system, the clam was quite resistant to cyanotoxins. The estimated MC concentration in C. leana was far beyond the World Health Organization's (WHO) provisional tolerable daily intake (0.04μgkg-1day-1), suggesting that consuming clams harvested during cyanobacterial blooms carries a high health risk. © 2015 The Authors.

Dang V.-S.,Institute of Tropical Biology | Tagane S.,Kyushu University | Toyama H.,Kyushu University | Naiki A.,University of Ryukyus | And 2 more authors.
Annales Botanici Fennici | Year: 2016

Lasianthus honbaensis V.S. Dang, Tagane & H. Toyama sp. nova (Rubiaceae) is described and illustrated from Hon Ba Nature Reserve, Khanh Hoa Province, southern Vietnam. It resembles L. inodorus and L. inodorus subsp. pubescens in leaf morphology, but differs from them in having shorter stipules, calyx tubes and corolla, and orange fruits. It is also similar to L. latifolius and L. calycinus in deeply disected calyx lobes and orange fruits, but differs from them by having persistent bracts and shorter calyx tubes. A table comparing the new species with its closest allies is provided. © Finnish Zoological and Botanical Publishing Board 2016.

Tran Q.H.,Ho Chi Minh City University of Technology | Nguyen T.T.,Ho Chi Minh City University of Technology | Le V.V.M.,Ho Chi Minh City University of Technology | Hoang K.A.,Institute of Tropical Biology
International Food Research Journal | Year: 2010

This paper deals with the effect of Tween 80 and ergosterol supplementation to the 24°Pt wort with 30% maltose syrup adjunct on the fermentation performance of the immobilized yeast in calcium alginate gel. The higher the content of supplements in the wort, the higher the yeast growth, the sugar and free amino nitrogen consumption rates and the ethanol production rate but the lower the ethanol content in the green beer. The star distance of central composite circumscribed design was used to study the influence of Tween 80 and ergosterol on the ethanol concentration in the green beer. The optimal content of Tween 80 and ergosterol supplemented to the wort were 0.3%v/v and 18mg/L, respectively. In these conditions, the primary fermentation time reduced 22.2% and the ethanol concentration in the green beer was similar in comparision with those of the control sample. © 2008 IFRJ.

Dang V.-S.,Institute of Tropical Biology
Taiwania | Year: 2015

A new variety, Markhamia stipulata (Wall.) Seem. ex Schum. var. canaense V.S. Dang var. nov. from Ca Na area of Thuan Nam District in Ninh Thuan Province, Southern Vietnam is described and illustrated. This variety is morphologically similar to Markhamia stipulata (Wall.) Seem. ex Schum. var. pierrei (Dop) Santisuk, but differs in having a longer corolla tube, shorter capsule, lesser number of leaflets and lateral veins. Furthermore, comparison of the diagnostic characters between this variety and the above mentioned related variety is also provided. © 2015 College of Life Science. All rights reserved.

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