1,284 research outputs found
sj-docx-1-npx-10.1177_1934578X241232281 - Supplemental material for Essential Oils of Two Species of Zingiberaceae Family from Vietnam: Chemical Compositions and <i>α</i>-Glucosidase, <i>α</i>-Amylase Inhibitory Effects
No full textSupplemental material, sj-docx-1-npx-10.1177_1934578X241232281 for Essential Oils of Two Species of Zingiberaceae Family from Vietnam: Chemical Compositions and α-Glucosidase, α-Amylase Inhibitory Effects by Hieu Tran-Trung, Duc Giang Le, Van Trung Hoang, Danh C. Vu, Tran Dinh Thang, Hieu Nguyen-Ngoc, Chen Tran Van, Thanh Triet Nguyen, Nguyen Hoang Tuan and Trang H.D. Nguyen in Natural Product Communications</p
A convergent relaxation of the Douglas–Rachford algorithm
No full textThis paper proposes an algorithm for solving structured optimization problems, which covers both the backward–backward and the Douglas–Rachford algorithms as special cases, and analyzes its convergence. The set of fixed points of the corresponding operator is characterized in several cases. Convergence criteria of the algorithm in terms of general fixed point iterations are established. When applied to nonconvex feasibility including potentially inconsistent problems, we prove local linear convergence results under mild assumptions on regularity of individual sets and of the collection of sets. In this special case, we refine known linear convergence criteria for the Douglas–Rachford (DR) algorithm. As a consequence, for feasibility problem with one of the sets being affine, we establish criteria for linear and sublinear convergence of convex combinations of the alternating projection and the DR methods. These results seem to be new. We also demonstrate the seemingly improved numerical performance of this algorithm compared to the RAAR algorithm for both consistent and inconsistent sparse feasibility problems.Team Raf Van de Pla
sj-docx-1-npx-10.1177_1934578X231167229 - Supplemental material for Phytochemical Analysis of the Essential Oils From the Rhizomes of Three Vietnamese <i>Curcuma</i> Species and Their Antimicrobial Activity
No full textSupplemental material, sj-docx-1-npx-10.1177_1934578X231167229 for Phytochemical Analysis of the Essential Oils From the Rhizomes of Three Vietnamese Curcuma Species and Their Antimicrobial Activity by Hieu Tran-Trung, Xuan Duc Dau, Thi Chung Nguyen, Hien Nguyen-Thi-Thu, Hieu Nguyen-Ngoc, Thi Giang An Nguyen, Van Trung Hoang, Dang-Khoa Nguyen, Danh Duc Nguyen, Chen Tran Van and Le Duc Giang in Natural Product Communications</p
Okinawepipona yty , Nguyen 2018
No full text<i>Okinawepipona yty</i> Nguyen, 2018 <p>Figs. 1–7</p> <p> <i>Okinawepipona yty</i> Nguyen, 2018: 592, 596 (key), female – “Y Ty, Bat Xat, Lao Cai ” (IEBR).</p> <p> The male specimens we examined are from the type locality and agree well with the description by Nguyen <i>et al</i>. (2018). As described below, the male is similar to the female both in structure and coloration except for some few characters.</p> <p> <b>Material examined.</b> VIETNAM: <b>Lao Cai:</b> 12 ♀, 16 ♁, Y Ty, Bat Xat, 22°36′29.5″N 103°37′29.6″E, alt. 1869 m, 6 May 2019, Nguyen Quang Cuong leg.; 3 ♁, Y Ty, Bat Xat, 22°37′14.5″N 103°37′25.5″E, alt. 1850 m, 15 July 2023, Nguyen Thi Phuong Lien, Nguyen Quang Cuong leg. [IEBR]</p> <p> <b>Description.</b> <i>Male</i> (Fig. 4) [female characters in square brackets]. Body length 11–12 mm; forewing length 11–12 mm. Head in frontal view subcircular, wider than high, about 1.2× as wide as high [1.1× as wide as high] (Fig. 1). Vertex without cephalic foveae [with cephalic foveae small, bearing dense pubescence, situated very close to each other, almost touching each other] (Fig. 2). Distance from posterior ocellus to apical margin of vertex nearly 1.6× distance from posterior ocellus to inner compound eye margin [more than 1.7× distance from posterior ocellus to inner compound eye margin] (Fig. 2). Gena slightly narrower than compound eye, in lateral view about 0.9× as wide as compound eye [much narrower than compound eye, in lateral view about 0.7× as wide as compound eye]. Occipital carina complete, present along entire length of gena, but dorsally somewhat weak. Inner compound eye margins strongly converging ventrally; in frontal view about 1.8× further apart from each other at vertex than at clypeus [1.3× further apart from each other at vertex than at clypeus]. Disc of clypeus in lateral view weakly convex at basal half, then straight to near apical margin; in frontal view 1.3× higher than wide [about as wide as high] (Fig. 1), with basal margin almost straight [slightly convex medially] and distinctly separated from antennal sockets; apical margin deeply emarginate medially, forming very sharp tooth on each lateral side [forming sharp tooth on each lateral side] (Fig. 1), without carina [with two faint carinae running from tooth at apical point to base direction]; width of emargination slightly greater than 1/3 width of clypeus between inner compound eye margins [width of emargination slightly less than 1/3 width of clypeus between inner compound eye margins]. Mandible with prominent teeth, second and third teeth with inner side almost straight [second and third teeth with inner side produced with round margin], fourth tooth pointed apically. Antennal scape about 3.3× as long as its maximum width [about 3.7× as long as its maximum width]; flagellomere I about 1.8× as long as wide [about 1.5× as long as wide], flagellomeres II and III slightly longer than wide [flagellomere III as wide as long], flagellomere IV as wide as long, flagellomeres V–IX wider than long, terminal flagellomere small, slightly curved, 3.5× as long as its basal width, reaching to near base of flagellomere IX when folded [terminal flagellomere bullet-shaped, as long as its basal width] (Fig. 3).</p> <p>Mesosoma, metasoma (except tergum VII and sternum VII), and body sculpture as same as in female except clypeus with dense, small, deep punctures [clypeus with dense, large, flat-bottomed punctures, each bearing silver bristle, punctures at center larger than at sides, space between punctures larger than puncture diameter]. Tergum VII and sternum VII with some small and sparse punctures come between minute punctures.</p> <p> <i>Color</i>. Black; similar to female except clypeus almost entirely yellow [large spots on upper lateral corner and a large spot on lower middle of clypeus]; head black [narrow band along inner compound eye margin extending from bottom of frons nearly to ocular sinus, large spot between antennal sockets].</p> <p> <i>Genitalia</i>. As in Figs. 5–7. Parameral spine lacking setae. Volsella flattened, spatulate, wide on inner aspect, and without setae at top (Fig. 5). Digitus knife-shaped, almost parallel at one-third from base, then gradually narrowing to top, with medium long setae on outer margin (Fig. 5). Penis valves of aedeagus long, about 1.6× as long as basal apodeme, in ventral view proximal part produced laterally into a round lobe laterally with blunt apex in inner margin apically (Fig. 6); in profile apical part produced into a round projection (Fig. 7); dorsal rod of aedeagus shorter than basal apodeme apically (Fig. 7).</p> <p> <b>Distribution.</b> Vietnam (Lao Cai).</p>Published as part of <i>Nguyen, Hieu Van, Nguyen, Manh Thanh & Nguyen, Lien Thi Phuong, 2024, Discovery of the male of Okinawepipona yty Nguyen, 2018 (Hymenoptera: Vespidae: Eumeninae) from Vietnam, pp. 79-84 in Zootaxa 5399 (1)</i> on page 80, DOI: 10.11646/zootaxa.5399.1.6, <a href="http://zenodo.org/record/10494478">http://zenodo.org/record/10494478</a>
sj-docx-1-npx-10.1177_1934578X231208348 - Supplemental material for Characterization and Evaluation of the In Vitro Antioxidant, α-Glucosidase Inhibitory Activities of <i>Camellia longii</i> Orel and Luu. (Theaceae) Flower Essential Oil and Extracts From Vietnam
No full textSupplemental material, sj-docx-1-npx-10.1177_1934578X231208348 for Characterization and Evaluation of the In Vitro Antioxidant, α-Glucosidase Inhibitory Activities of Camellia longii Orel and Luu. (Theaceae) Flower Essential Oil and Extracts From Vietnam by Hieu Tran-Trung, Thi Chung Nguyen, Vo Cong Dung, Hieu Nguyen Ngoc, Dang Khoa Nguyen, Danh Cong Vu, Son Dang Van, Quynh Anh Thai Nguyen, Trang Ha Dieu Nguyen, Vo Mong Tham and Xuan Duc Dau in Natural Product Communications</p
FIGURE 3. Typhonium khonkaenensis. A in A new species and a new record of Typhonium (Araceae) from southern Vietnam
No full textFIGURE 3. Typhonium khonkaenensis. A. The species in habitat. B. Whole plant. C. Different forms of leaf blade. D. Inflorescence. E. Spathe. F. Part of spadix showing male, sterile and female zones. G. Spathe, inside. H. Stamens. I. Female flowers. J. Fruits. K. Seeds.Published as part of Van, Hong Thien, Le, Van Son, Nguyen-Phi, Nga, Nguyen, Quoc Dat, Nguyen, Tran Quoc Trung, Nguyen, Hieu Cuong & Luu, Hong Truong, 2021, A new species and a new record of Typhonium (Araceae) from southern Vietnam, pp. 201-208 in Phytotaxa 527 (3) on page 205, DOI: 10.11646/phytotaxa.527.3.4, http://zenodo.org/record/575136
Supplemental material - Supplemental material for A New Sexangularetin Derivative From <i>Camellia hakodae</i>
No full textSupplemental material, Supplemental material, for A New Sexangularetin Derivative From Camellia hakodae by Nguyen T. Tuyen, Tran Van Hieu, Pham G. Dien, Tran Ninh, Nguyen T. Hung and Vu D. Hoang in Natural Product Communications</p
First record for Brettus cingulatus in Vietnam (Araneae: Salticidae: Spartaeini)
No full textTam, Truong Van, Huy, Le Ngo Quoc, Phuc, Nguyen Trong, Nhan, Vo Hieu, Khang, Luu Vinh (2021): First record for Brettus cingulatus in Vietnam (Araneae: Salticidae: Spartaeini). Peckhamia 229 (1): 1-2, DOI: 10.5281/zenodo.716937
Typhonium vietnamense Luu, Nguyen-Phi & H. T. Van 2021, sp. nov.
No full textTyphonium vietnamense Luu, Nguyen-Phi & H.T.Van, sp. nov. (Figs. 1, 2) The new species is most morphologically similar to Typhonium varians Hett. & Sookchaloem in Hetterscheid et al. (2001: 51) in variant shape of leaves, triangular ovate spathe limb and general florescence structure but differs from the latter in having plain green (vs. variegated) leaves, underground (vs. above ground) flowering spathe tube, abaxially reddish purple to greenish grey, brownish mottled and ascending (vs. dark green flushed with dirty brown and horizontal) spathe limb, erect (vs. ascending) spadix, bright yellow staminodes curved downwards at their tips only (vs. pale yellow staminodes curved upwards or downwards over their entire length), ovoid (vs. spathulate to pyriform) fruits and generally smaller floral parts (3.5–4.5 vs. 8.0– 13.5 cm long spadix, 3.5–5.0 × 2.0–2.5 vs. 7–14 × 4.0– 7.5 cm spathe limb, 2.0–3.5 × 0.4–0.5 vs. 4.5–9.0 × 0.6–1.0 cm spadix appendix). Type:— VIETNAM. Ba Ria - Vung Tau Province: Binh Chau - Phuoc Buu Nature Reserve, about 107 o 30’52’’E, 10 o 36’17’’N, 30 m elevation, 05 August 2015, Le Van Son, Nguyen Phi Nga & Van Hong Thien H . T. Van 115 (holotype SGN!, isotypes PHH!, VNMN!). Herb seasonally dormant; rhizome tuberous, subglobose to ellipsoid, underground, 1.0– 1.5 cm long, ca. 1 cm in diameter, producing many thick roots. Leaves 4–5. Petiole smooth, slender, 7–15 cm long, 2–3 mm in diameter, white to grey with brownish mottled at base, green towards the apex. Leaf blades entire or pedatisect, green above, pale green beneath; entire blades linear, deltoid to lanceolate, 6–10 cm long, 2–8 cm wide, with acuminate to obtuse apex; pedatisect blades with 3 to 5 linear to lanceolate segments (up to 15 cm long, 2.0– 4.5 cm wide). Inflorescence, solitary (rarely 2), slightly foetid smelling; peduncle underground, elongated in fruiting, white, 1.5–2.0 cm long, ca. 3–5 mm in diameter; spathe 4.5–6.0 cm long; spathe tube underground, separated from the limb by a constriction, ovoid or ellipsoid, 1.3–1.7 cm long, 9–10 mm wide, outside white with brownish dots, inside white to pale pink; spathe limb triangular ovate, 3.5–5.0 cm long, 2.0– 2.5 cm wide, outside reddish purple to greenish grey, brownish mottled, inside dark purple to reddish purple; spadix little shorter than spathe, sessile, erect; female zone conical, 2–3 mm high, ca. 5 mm in diameter at base, with 6–7 rows of crowded pistils; ovary obovoid or slightly cylindrical, 1 mm high, 0.7 mm in diameter, translucent white with brownish dots at apex, 1-locular, with 1 basal ovule; style very short; stigma disciform, thick, 0.6 mm in diameter, 0.3 mm high, blackish purple to pink, papillate; sterile zone contiguously female zone, 8–10 mm long, lower part covered with 3–4 rows of staminodes, upper part naked; staminodes bright yellow, subulate, 2–3 mm long, ca. 0.5 mm in diameter, ascending forming an obtuse angle with the spadix axis, slightly curved downward, weakly papillose; male zone cylindrical, 6–10 mm long, 3.5–5.0 mm in diameter; stamens densely arranged, pale yellow to pink; thecae opening by elongate slit; appendix shortly stipitate, outside brownish purple to reddish, inside light yellow, elongate conical, 2.0– 3.5 cm long, 4–5 mm in diameter at base, with acute apex and truncate base. Infructescence obconical with spathe tube remaining and above the ground; fruits obconical, pinkish white with pale pinkish spots, 4–7 mm long, 2–3 mm wide, 1-seeded; seed obovate (or having constriction), at first creamy white, light brown when mature, 3.0– 3.5 mm long, 2.0– 2.5 mm wide. Etymology: —The species is named after Vietnam, the country of origin. Vietnamese name: —Bán hạ Việt Nam. Ecology: —The new species grows in clumps on open sandy soil in sparse dipterocarp-dominated forests. Different leaf forms were found in plant individuals or clumps. Flowering was seen in May to June and fruiting in July to August. The plant becomes dormant in November to April next year. Additional specimen examined (paratype):— VIETNAM. Dak Lak Province: Yok Don National Park, 01 October 2015, Nguyen Le Xuan Bach & Van Hong Thien H . T.Van 126 (SGN!). Distribution: —Ba Ria - Vung Tau Province and Dak Lak Province, southern Vietnam. Proposed IUCN conservation status: — Data Deficient (DD) (IUCN Standards and Petitions Subcommittee 2017). Typhonium vietnamense has so far been found in two protected areas (Binh Chau - Phuoc Buu Nature Reserve, Ba Ria - Vung Tau Province and Yok Don National Park, Dak Lak Province) in southern Vietnam. Although its habitat in Binh Chau - Phuoc Buu Nature Reserve is planned to be converted into a resort in the near future, the species is likely to occur in adjacent similar sparse dipterocarp-dominated forests in Cambodia. Further survey work is necessary before a definitive conservation assessment can be made. Notes: —The new species is morphologically closest to Typhonium varians but they have a number of differences as expressed in the diagnosis. Several other Typhonium species share with T. vietnamense a similar spadix structure, especially in the shape of spadix appendix and staminodes, but these are easily distinguishable: T. conchiforme Hetterscheid & Galloway (2006: 80) by deeply sagittate leaf blades, deeply cymbiform, strongly concave spathe limb and off-white or pale yellow staminodes; T. sagittariifolium Gagnepain (1942b: 11) by deeply trilobed sagittate leaf blades, erect elongate triangular spathe limb, longer spadix appendix (8 mm), and longer (3–5 mm) and recurved staminodes; and Typhonium viridispathum Galloway & Sinhabaedya (2012: 61) by bright green spathe with elongate triangular limb, off-white spadix appendix, basally white and apically pale green ovaries and white staminodes.Published as part of Van, Hong Thien, Le, Van Son, Nguyen-Phi, Nga, Nguyen, Quoc Dat, Nguyen, Tran Quoc Trung, Nguyen, Hieu Cuong & Luu, Hong Truong, 2021, A new species and a new record of Typhonium (Araceae) from southern Vietnam, pp. 201-208 in Phytotaxa 527 (3) on pages 201-204, DOI: 10.11646/phytotaxa.527.3.4, http://zenodo.org/record/575136
Figures 1-3 in First record for Brettus cingulatus in Vietnam (Araneae: Salticidae: Spartaeini)
No full textFigures 1-3. Adult female Brettus cingulatus in Ben Tre Province, Vietnam.Published as part of Tam, Truong Van, Huy, Le Ngo Quoc, Phuc, Nguyen Trong, Nhan, Vo Hieu & Khang, Luu Vinh, 2021, First record for Brettus cingulatus in Vietnam (Araneae: Salticidae: Spartaeini), pp. 1-2 in Peckhamia 229 (1) on page 1, DOI: 10.5281/zenodo.716937
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