4,729 research outputs found
Raphiocarpus taygiangensis C. H. Nguyen, K. S. Nguyen & Aver.
No full text<p> 8. <i>Raphiocarpus taygiangensis</i> C.H.Nguyen, K.S.Nguyen & Aver. in Nguyen <i>et al.</i> (2023: 21).</p> <p> <b>Type:</b> <i>—</i> VIETNAM. Quang Nam: Tay Giang District, A Xan Village, 1270 m, around point 15°48’57”N 107°19’47”E, 20 April 2022, <i>C.H.Nguyen</i> et al. CKH 2022042068 (holotype VNF, isotypes HN, LE!)</p> <p> <b>Distribution</b>:—The species is endemic to Vietnam, known on the basis of the only type collection in Quang Nam Province.</p> <p> <b>Ecology and phenology</b>:—It grows in evergreen broad-leaved submontane forests on granite and shale at elevations of about 1300 m a.s.l. Flowers in April–May.</p> <p> <b>Conservation status</b>:—Up to date, only one population of this species is currently known. Considering the small population size (less than 500 mature individuals growing on an area less than 5 km 2) and fragile habitat, the species conservation status was preliminarily assessed as Vulnerable (VU D2) according to the criteria of IUCN 2023 (Nguyen <i>et al.</i> 2023). No additional data become available since this assessment.</p>Published as part of <i>Nguyen, Cuong Huu, Wen, Fang, Pham, Toai Minh, Nguyen, Yen Thi, Bui, Thanh Minh, Bui, Doi The, Nguyen, Khang Sinh & Averyanov, Leonid V., 2023, The checklist of Raphiocarpus species (Gesneriaceae, Didymocarpinae) in the flora of Vietnam with the description of a new species, R. bicallosus, pp. 223-234 in Phytotaxa 616 (3)</i> on page 231, DOI: 10.11646/phytotaxa.616.3.2, <a href="http://zenodo.org/record/10084863">http://zenodo.org/record/10084863</a>
The potential for mitigation of CO2 emissions in Vietnam's power sector
No full textThis manuscript examines CO2 emissions from Vietnam's power sector using an expanded Integrated Resource Planning model. The potential effects of the following alternative policy options are examined: energy efficiency, favorably imported generation fuels, nuclear energy, renewable energy, and an internalized positive carbon value. The baseline in terms of cumulative CO2 emissions over 2010-2030 is 3.6 Gt. Lighting energy efficiency improvements offers 14% of no-regret abatement of CO2 emissions. Developing nuclear and renewable energy could help meet the challenges of the increases in electricity demand, the dependence on imported fuels for electricity generation in the context of carbon constraints applied in a developing country. When CO2 costs increase from 1 /t, building 10 GW of nuclear generation capacity implies an increase in abatement levels from 24% to 46%. Using renewable energy abates CO2 levels by between 14% and 46%. At 2 /tCO2, the model predicts an abatement of 1.4 Gt when efficient gas plants are substituted for coal generation and when the potential for wind energy is economically developed further than in the former model.integrated resource planning, carbon value, abatement of CO2 emissions, Vietnam, electricity generation
Superresolution mapping using a hopfield neural network with fused images
No full textSuperresolution mapping is a set of techniques to increase the spatial resolution of a land cover map obtained by soft classification methods. In addition to the information from the landcover proportion images, supplementary information at the subpixel level can be used to produce more detailed and accurate land cover maps. The proposed method in this research aims to use fused imagery as an additional source of information for superresolution mapping using the Hopfield neural network (HNN). Forward and inverse models were incorporated in the HNN to support a new reflectance constraint added to the energy function. The value of the function was calculated based on a linear mixture model. In addition, a new model was used to calculate the local end member spectra for the reflectance constraint. A set of simulated images was used to test the new technique. The results suggest thatfine spatial resolution fused imagery can be used as supplementary data for superresolution mapping from a coarser spatial resolution land cover proportion imagery
Metaphire iranomala Nguyen & Lam & Nguyen 2021, sp. nov.
No full textMetaphire iranomala sp. nov. urn:lsid:zoobank.org:act: 2ECB8639-C770-4828-92D9-055E0778E422 Figs 1–3, Tables 2–3 Pheretima anomala (non Pheretima anomala Michaelsen, 1907) – Thai et al. 2004: 758. – Nguyen 2014: 108. – Nguyen et al. 2017a: 893, fig. 7; 2017b: 98, fig. 3; Nguyen et al. 2019: 120, fig. 3. Metaphire anomala – Nguyen et al. 2016: 50. Diagnosis Medium-sized worm, length 157–228 mm, diameter 6.5–8.0 mm, segments 85–145. Prostomium epilobous. Clitellum annular, within xiv–xvi. First dorsal pore in 12/13. Four pairs of spermathecal pores on ventrolateral intersegments 5/6/7/8/9. Male pores on the setal ring of segment xix; copulatory pouches present. Genital markings absent. Holandric. Testis sacs connected. Intestinal caeca simple. Septa 8/9/10 absent. Etymology The epithet ‘ iranomala ’ is formed by the prefix ‘ ir ’ and ‘ anomala ’ to emphasise the wrong name ‘ anomala ’ recorded in Vietnam. Material examined Holotype VIETNAM • mature spec.; Ba Ria-Vung Tau Province, Con Dao National Park; 8°42′12″N; 106°35′41″ E; 120 m a.s.l.; 19 Oct. 2019; Nguyen Thanh Tung and Nguyen Thi Bao Ngoc leg.; natural forest; CTU-EW.020.h01. Paratypes VIETNAM • 9 matures; same collection data as for holotype; CTU-EW.020.p02. Other material VIETNAM – Ba Ria-Vung Tau Province • 16 matures; same collection data as for holotype; CTU-EW.020.03 • 10 matures; Con Son Island; 8°41′59″ N, 106°36′54″ E; 10 m a.s.l.; 18 Oct. 2019; Nguyen Thanh Tung and Nguyen Thi Bao Ngoc leg.; residential gardens; CTU-EW.020.04 • 33 matures; Con Son Island; 8°39′53″ N, 106°34′00″ E; 20 m a.s.l.; 19 Oct. 2019; Nguyen Thanh Tung and Nguyen Thi Bao Ngoc leg.; natural forest; CTU-EW.020.05. – Kien Giang Province • 1 mature; Da Dung mountain; 10°25′07″ N, 104°28′46″ E; Nov. 2010; Nguyen Thanh Tung leg.; natural forest; CTU- EW.DNA.020.23 • 49 matures; Lai Son Island; 09°48′01″ N, 104°39′18″ E; Nov. 2013; Trinh Thi Kim Binh leg.; natural forest; CTU-EW.020.11. – An Giang Province • 57 matures; Cam mountain; 10°30′36″ N, 105°00′09″ E; Nov. 2010; Nguyen Thanh Tung leg.; natural forest; CTU-EW.020.12 • 2 matures; Cam mountain; 10°30′36″ N, 105°00′09″ E; Nov. 2010; Nguyen Thanh Tung leg.; natural forest; IEBR-EW.020.22. – Dong Nai Province • 2 matures; Vinh Cuu Nature Reserve; 11°06′46″ N, 107°03′12″ E; Oct. 2019; Nguyen Quoc Nam leg.; natural forest; IEBR-EW.020.18a • 3 matures; Vinh Cuu Nature Reserve; 11°06′46″ N, 107°03′12″ E; Oct. 2019; Nguyen Quoc Nam leg.; natural forest; CTU-EW.DNA.020.18b • 7 matures; Cat Tien National Park; 11°26′05″ N, 107°25′45″ E; Oct. 2013; Le Van Nhan leg.; natural forest; CTU-EW.020.07. – Tay Ninh Province • 1 mature; Duong minh Chau District; 11°22′59″ N, 106°12′00″ E; Sep. 2019; Nguyen Quoc Nam leg.; home garden; IEBR-EW.020.16 • 6 matures; Ba Den mountain; 11°23′26″ N, 106°09′19″ E; Sep. 2019; Nguyen Quoc Nam leg.; mango gardens; CTU-EW.020.17. Description Body cylindrical, large-medium size, length 157–228 mm, diameter 6.5–8.0 mm, segments 85–145, weight 3.0–8.4 gr. Dorsum slightly dark grey, ventrum paler. Prostomium epilobous. First dorsal pore in 12/13. Perichaetine, setae at pre-clitellar segments stouter and sparser than that at post-clitellar segments; setal numbers: 55–62 in viii, 65–71 in xxx, 10–16 between male pores on xix. Setal distance: aa> ab, zz> zy. Clitellum annular, within xiv–xvi, darkish brown, without dorsal pores and setae. Female pore single, mid-ventral in xiv. Four pairs of spermathecal pores on ventrolateral intersegments 5/6/7/8/9. Ventral distance between spermathecal pores ca 0.27–0.3 body circumference. Male pores on copulatory pouches in xix; ventral distance between male pores ca 0.2–0.3 body circumference. Genital markings absent in both spermathecal and male pores region. Septa 5/6/7/8 thickened, 8/9/10 absent, 10/11/12 thin. Oesophageal gizzard between 7/8 and 10/11. Intestine origin at xv; caeca simple, short within xxvii-xxiv. Last hearts in xiii. Pharyngeal micronephridia developed in 5/6/7. Lymph glands absent. Typhlosole simple, lamelliform. Spermathecae paired in vi–ix. Spermathecal ampulla large, mango-shaped; duct about a quarter of ampulla length. Diverticula attached to the base of ampulla ducts; distal part strongly coiled, swollen into coiled sinusoidal seminal chambers. Spermathecal ducts without nephridia. Accessory glands absent in the spermathecal region. Holandric. Testis sacs in x and xi, connected ventrally. Seminal vesicles well developed in xi and xii. Ovaries on septum 12/13 posteriorly. Prostate glands, deeply lobuled, paired in xvii–xxi; prostatic ducts C-shaped. Accessory glands massed, covered the copulatory pouches. DNA barcode COI barcode data (partial) is for the paratypes uploaded to GenBank under the accession numbers MW076191, MW076192, MW076193, MW076194, MW076195, and MW076196. The new species shares the identity of 88.13% and 88.33% with Metaphire anomala (KU262251, KU565252, KU565253, KU565254). Habitat The species was found in leaf-litters or in the top-soil layer, especially in moist places (near streams) or in rocky holes with organic matter. Metaphire iranomala sp. nov. has a soft body, violet light skin when alive. Its moving behavior is similar to a caterpillar locomotion. The species was commonly located in hilly/mountainous areas, but occasionally found in deltas. Variations Metaphire iranomala sp. nov. has two slightly different morphological types. The first type is more likely to be distributed in islands or in coastal provinces in Vietnam; the other type is found in mainland provinces. 1 Freshly collected specimens; 2 Bantaowong et al. (2011); 3 Gates (1925, 1972) and Stephenson (1929); 4 Michaelsen (1907). 1 Goto & Hatai (1899) and Blakemore (2016b); 2 Cognetti (1908). There are not many differences between the two types except the ventral distance between the male pores (0.2–0.22 vs 0.25–0.3). However, the COI genetic distance also distinguishes two types (see below). Remarks The new species has been previously identified as Metaphire anomala. It is widely distributed in Southern Vietnam (Thai et al. 2004; Nguyen 2014; Nguyen et al. 2017a, 2017b, 2019, 2020). However, this species is very different from both the original description (Michaelsen 1907), and re-description of M. anomala from Myanmar (Gates 1925, 1972), Thailand (Bantaowong et al. 2011) in the position of male pores, number and position of spermathecal pores, genital markings in male and spermathecal regions and body size. These differences are summarised in Table 2. A few Metaphire species have been known to exhibit male pores not in segment xviii. Only M. anomala has male pores on xx, whereas two other species, M. isselii Cognetti, 1908 and M. megascolidioides Goto & Hatai, 1899, have male pores on xix. The new species is similar to these two species by having male pores on xix, a first dorsal pore in 12/13 and the absence of genital markings in the spermathecal region. However, the new earthworm species is clearly distinguished by body size, the number and position of spermathecal pores, the morphology of its male region, the status of septum 8/9, and they type of intestinal caeca. The differences are summarised in Table 3.Published as part of Nguyen, Tung T., Lam, Dang H. & Nguyen, Anh D., 2021, Notes on the earthworm species, Metaphire anomala (Michaelsen, 1907) (Clitellata, Megascolecidae) in Southern Vietnam, with descriptions of two new species, pp. 94-111 in European Journal of Taxonomy 746 on pages 98-103, DOI: 10.5852/ejt.2021.746.1321, http://zenodo.org/record/470913
sj-docx-1-wso-10.1177_17474930231208817 – Supplemental material for Endovascular treatment for acute ischemic stroke beyond the 24-h time window: Selection by target mismatch profile
No full textSupplemental material, sj-docx-1-wso-10.1177_17474930231208817 for Endovascular treatment for acute ischemic stroke beyond the 24-h time window: Selection by target mismatch profile by Trung Quoc Nguyen, Mai Hoang Tran, Hai Ngoc Phung, Khang Vinh Nguyen, Hang T Minh Tran, Silke Walter, Dinh C Bao Hoang, Binh Nguyen Pham, Anh Le Tuan Truong, Vu Thanh Tran, Thanh N Nguyen, An Le Pham and Huy-Thang Nguyen in International Journal of Stroke</p
sj-png-2-wso-10.1177_17474930231208817 – Supplemental material for Endovascular treatment for acute ischemic stroke beyond the 24-h time window: Selection by target mismatch profile
No full textSupplemental material, sj-png-2-wso-10.1177_17474930231208817 for Endovascular treatment for acute ischemic stroke beyond the 24-h time window: Selection by target mismatch profile by Trung Quoc Nguyen, Mai Hoang Tran, Hai Ngoc Phung, Khang Vinh Nguyen, Hang T Minh Tran, Silke Walter, Dinh C Bao Hoang, Binh Nguyen Pham, Anh Le Tuan Truong, Vu Thanh Tran, Thanh N Nguyen, An Le Pham and Huy-Thang Nguyen in International Journal of Stroke</p
HIV and tuberculosis in Ho Chi Minh City, Vietnam, 1997-2002.
No full textIn Ho Chi Minh City, Vietnam, reporting rates for tuberculosis (TB) are rising in an emerging HIV epidemic. To describe the HIV epidemic among TB patients and quantify its impact on rates of reported TB, we performed a repeated cross-sectional survey from 1997 through 2002 in a randomly selected sample of inner city TB patients. We assessed effect by adjusting TB case reporting rates by the fraction of TB cases attributable to HIV infection. HIV prevalence in TB patients rose exponentially from 1.5% to 9.0% during the study period. Young (<35 years), single, male patients were mostly affected; injection drug use was a potent risk factor. After correction for HIV infection, the trend in TB reporting rates changed from a 1.9% increase to a 0.4% decrease per year. An emerging HIV epidemic, concentrated in young, male, injection drug users, is responsible for increased TB reporting rates in urban Vietnam
Supplemental Material, sj-htm-1-cll-10.1177_09636897211039441 - Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System
No full textSupplemental Material, sj-htm-1-cll-10.1177_09636897211039441 for Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System by Minh Quang Nguyen, Hue T. H. Bui, Anh Nguyen Thi Tuyet, Trinh Thi Hong Nhung, Duc M. Hoang, Nguyen Thanh Liem and Van T. Hoang in Cell Transplantation</p
Supplemental Material, sj-rar-1-cll-10.1177_09636897211039441 - Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System
No full textSupplemental Material, sj-rar-1-cll-10.1177_09636897211039441 for Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System by Minh Quang Nguyen, Hue T. H. Bui, Anh Nguyen Thi Tuyet, Trinh Thi Hong Nhung, Duc M. Hoang, Nguyen Thanh Liem and Van T. Hoang in Cell Transplantation</p
Supplemental Material, sj-rar-2-cll-10.1177_09636897211039441 - Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System
No full textSupplemental Material, sj-rar-2-cll-10.1177_09636897211039441 for Comparative Bioactivity Analysis for Off-the-Shelf and Culture–Rescued Umbilical Cord-Derived Mesenchymal Stem/Stromal Cells in a Xeno- and Serum-Free Culture System by Minh Quang Nguyen, Hue T. H. Bui, Anh Nguyen Thi Tuyet, Trinh Thi Hong Nhung, Duc M. Hoang, Nguyen Thanh Liem and Van T. Hoang in Cell Transplantation</p
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