Vietnamese Academy of science and Technologies

Hanoi, Vietnam

Vietnamese Academy of science and Technologies

Hanoi, Vietnam

Time filter

Source Type

Tu N.D.,Vietnamese Academy of science and Technologies | Gagarin V.G.,Russian Academy of Sciences | Thanh N.V.,Vietnamese Academy of science and Technologies | Phuong N.T.X.,Vietnamese Academy of science and Technologies | Hien N.T.,Vietnamese Academy of science and Technologies
Inland Water Biology | Year: 2014

Illustrated discriptions are given of two new marine free-living nematode species of the genus Daptonema Cobb, 1920, D. paraoxyuroides sp. n. and D. balatum sp. n., found in the estuary of the Red River in North Vietnam. D. paraoxyuroides sp. n. resembles D. oxyuroides, but differs from it in its shorter and thicker body, less slender tail, shorter cephalic setae, and shorter spicules. D. balatum sp. n. differs from all known valid species of the genus Daptonema by the special structure of the copulative apparatus of males. © 2014 Pleiades Publishing, Ltd.


Gagarin V.G.,Russian Academy of Sciences | Tu N.D.,Vietnamese Academy of science and Technologies
Zootaxa | Year: 2014

Two nematode species isolated from sediments of the littoral zone of South China Sea on the coast of Vietnam are described and illustrated. Paracomesoma minor sp. n. is closely related to P. elegans Gagarin & Thanh, 2009 and P. lissum Gagarin & Thanh, 2009. It differs from the former species in the shorter body, longer and more slender tail, longer cephalic setae and shorter spicules, and from the latter species in the shorter body, longer cephalic setae, presence of cervical setae and smaller number of precloacal supplements in males. Microlaimus validus sp. n. is morphologically closest to M. citrus Gerlach, 1959 and M. nanus Blome, 1982 and differs from both species in the longer body, relatively shorter pharynx and relatively shorter and thicker tail. © 2014 Magnolia Press.


Gagarin V.G.,Russian Academy of Sciences | Thanh N.V.,Vietnamese Academy of science and Technologies
Zootaxa | Year: 2015

Two nematode species found in Yen River Estuary of Vietnam are described and illustrated. Subsphaerolaimus minor sp. n. is similar to S. lamasus Gerlach, 1956, but differs from it in the shorter body, comparatively shorter pharynx and shorter cephalic setae. A pictorial key for determination of valid species in the genus Subsphaerolaimus Lorenzen, 1978 is given. Micromicron cephalatum Cobb, 1920 is redescribed and reillustrated based on numerous males and females. The genus Micromicron Cobb, 1920 is confirmed as a valid genus with type and only species, M. cephalatum Cobb, 1920. Copyright © 2015 Magnolia Press.


PubMed | Russian Academy of Sciences and Vietnamese Academy of science and Technologies
Type: Journal Article | Journal: Zootaxa | Year: 2014

Two nematode species isolated from sediments of the littoral zone of South China Sea on the coast of Vietnam are described and illustrated. Paracomesoma minor sp. n. is closely related to P. elegans Gagarin & Thanh, 2009 and P. lissum Gagarin & Thanh, 2009. It differs from the former species in the shorter body, longer and more slender tail, longer cephalic setae and shorter spicules, and from the latter species in the shorter body, longer cephalic setae, presence of cervical setae and smaller number of precloacal supplements in males. Microlaimus validus sp. n. is morphologically closest to M. citrus Gerlach, 1959 and M. nanus Blome, 1982 and differs from both species in the longer body, relatively shorter pharynx and relatively shorter and thicker tail.


Vladimirov A.G.,RAS Institute of Geology and Mineralogy | Balykin P.A.,RAS Institute of Geology and Mineralogy | Anh P.L.,Vietnamese Academy of science and Technologies | Kruk N.N.,RAS Institute of Geology and Mineralogy | And 8 more authors.
Russian Journal of Pacific Geology | Year: 2012

New data obtained on the Khao Que-Tam Tao gabbro-granite pluton (Northern Vietnam) are discussed. It was established that this pluton was formed at the Permian-Triassic boundary (250.5 ± 3.2 Ma, 40Ar/ 39Ar isotopic age). Morphologically, it represents a hypabyssal fracture intrusion. The first stage was marked by the intrusion of the picrobasaltic melt, the differentiation of which resulted in the formation of the layered peridotite-gabbro series and the quartz-bearing monzodiorites and granophyres in its endocontact at the final stage. At the second stage, the Khao Que peridotite-gabbro massif was broken in its central part by a fault, along which the Tam Tao granodiorite-granite massif was localized. Numerical simulation using the COMAGMAT program for the basic system and geochemical estimates for the granite system allow the statement that the mafic and granitic melts evolved independently, and their final products were quartz-bearing monzodiorite and granophyre, on the one hand, and aplites and pegmatites, on the other hand. The compositional correlation of the Permian-Triassic magmatic associations in Northern Vietnam (the Nui Chua gabbro pluton and the Khao Que-Tam Tao gabbro-granite and Pia Bioc granite plutons) and in Southeast China (flood basalts) allows these complexes to be regarded as a part of a single large igneous province produced by the Emeishan plume activity. © 2012 Pleiades Publishing, Ltd.


Vasiliev V.I.,RAS Institute of Geology and Mineralogy | Borisenko A.S.,RAS Institute of Geology and Mineralogy | Mortsev N.K.,RAS Institute of Geology and Mineralogy | Khoa C.C.,Vietnamese Academy of science and Technologies | Fyong N.T.,Vietnamese Academy of science and Technologies
Geology of Ore Deposits | Year: 2011

For the first time in ore deposits of Vietnam, a mineral phase containing Au, Bi, and S as major elements was found in the gold ore of the Dakripen deposit. Pb is also present as a minor isomorphic impurity. Rare irregular or ellipsoid grains of that mineral up to 35 μm in size were identified in polished sections together with pyrite; galena; sphalerite; bismuthinite; ikunolite; native bismuth; and, occasionally, gold. All these species are related to the third stage of the ore formation. In reflected light, the mineral is bluish white, the reflectance is comparable with ikunolite and slightly higher than that of bismuthinite, and weak pleochroism and visible anisotropy are established. The mineral is opaque and brittle without internal reflections. According to 18 microprobe analyses, its average chemical composition and quantitative variations for the major elements are as follows (wt %): 14.02 (13.11-14.58) Au, 76.37 (74.93-76.91) Bi, 0.49 (0.10-1.00) Pb, 9.80 (8.87-10.07) S, and 100.68 in total. The empirical formula calculated for the average element contents-Au 0.96(Bi 4.91Pb 0.03) 4.94S 4.10-is similar to the idealized formula of jonassonite from the Nagybörzsöny deposit (Hungary)-Au(Bi,Pb) 5S 4-approved by the Commission on New Minerals and Mineral Names of the International Mineralogical Association. The typical mineral assemblage, optical properties, and chemical composition of this mineral allow us to regard it as a low-Pb variety of jonassonite. It may be assumed that the real formula of jonassonite without sporadic impurities of Pb and other elements must be AuBi 5S 4, as was stated before in the first communication of the Commission on New Minerals and Mineral Names of the International Mineralogical Association and is typical of minerals from Kazakhstan, Russia, Japan, Germany, the Czech Republic, the United States, and Australia. © 2011 Pleiades Publishing, Ltd.

Loading Vietnamese Academy of science and Technologies collaborators
Loading Vietnamese Academy of science and Technologies collaborators