VNU Journal of Science: Natural Sciences and Technology最新文献_第9页

Two New Records of Species and A New Synonym of Genus Typhonium (Araceae) For Flora of Indochina 标题中南植物区系天南星科台风属两种新记录及一新名

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-07-19 DOI: 10.25073/2588-1140/vnunst.5321

N. Dư, Nguyen Thi Ngoc Anh, T. V. Tien, Lê Chí Toàn

引用次数: 1

Diversity of Green Macroalgae Genus Ulva (Chlorophyta) in Hai Phong and Potential Uses 海防绿藻属(绿藻类)的多样性及其潜在利用

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-07-19 DOI: 10.25073/2588-1140/vnunst.5337

N. M. Linh, Dam Duc Tien, P. V. Quang, Cao Van Luong, Vu Manh Hung

{"title":"Diversity of Green Macroalgae Genus Ulva (Chlorophyta) in Hai Phong and Potential Uses","authors":"N. M. Linh, Dam Duc Tien, P. V. Quang, Cao Van Luong, Vu Manh Hung","doi":"10.25073/2588-1140/vnunst.5337","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5337","url":null,"abstract":"The knowledge of marine algae species composition is imperative not only for understanding the structure, function and biogeographical affinities but also for planning strategies for marine algae conservation and management. This study was carried out to determine the diverse species and evaluate some use-values of green macroalgae from genus Ulva in Hai Phong, where many different habitats such as estuarine floodplains, lagoons or small bays and diverse in the bottom (hard, sandy, sandy-mud bottom). Ulva samples were collected at 11 sites in 5 areas in 2021. Based on the results of species composition, were identified 11 species of the genus Ulva. The species composition of the genus Ulva in Hai Phong accounted for 73.3% of the total species recorded in Vietnam; accounting for 19.6% of the total number of Asian species, and 12.9% of the total number of Ulva species in the world. The Cluster and MDS (Multi-Dimensional Scaling analysis) on the similarity in vertical distribution and geographical distribution among the studied species. Based on the active ingredients and uses value, the studied determined 9 species of genus Ulva in Hai Phong were identified with economic value.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90195740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Anatomical Features of Scutellaria tonkinensis Doan in Vietnam 越南黄芩的解剖学特征

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-07-19 DOI: 10.25073/2588-1140/vnunst.5244

D. Xuyen, Ngo Thu Hao, Doan Van Ve, N. Thanh

引用次数: 0

Synthesis of Nanoplatelet Zinc Borate and its Combination with Expandable Graphite and Red Phosphorus as Flame Retardants for Polypropylene 纳米片状硼酸锌的合成及其与可膨胀石墨和红磷复合聚丙烯阻燃剂的研究

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-07-19 DOI: 10.25073/2588-1140/vnunst.5402

Truong Cong Doanh, Hac Thi Nhung, Nguyen Thi Hanh, N. Hien, Do Tien Dat, Vu Minh Tan, Hoang Mai Ha

{"title":"Synthesis of Nanoplatelet Zinc Borate and its Combination with Expandable Graphite and Red Phosphorus as Flame Retardants for Polypropylene","authors":"Truong Cong Doanh, Hac Thi Nhung, Nguyen Thi Hanh, N. Hien, Do Tien Dat, Vu Minh Tan, Hoang Mai Ha","doi":"10.25073/2588-1140/vnunst.5402","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5402","url":null,"abstract":"The zinc borate nanoparticles (2ZnO.3B2O3.3H2O) were successfully prepared by precipitation reaction in aqueous solutions of borax and zinc sulfate using oleic acid as a surfactant. The structural, morphological characteristics and the wettability of the particle surface were studied through Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and the contact angle. The hydrophobic zinc borate (n-ZB) had nanoplatelet morphology with a diameter of 1.0 - 1.5 µm and thickness of about 90 nm. Nano zinc borate showed a synergistic influence with expandable graphite (EG) and red phosphorus (RP) on the flame retardant properties and thermo-oxidative stability of polypropylene (PP). The nanocomposite 7n-ZB/7RP/7EG/PP achieved the V-1 UL94 verticle burning test with a limited oxygen index of 23.7% and the char yield of 14.67 wt.% at 900 oC. Furthermore, the fire retardant performance and the mechanical properties of the nanocomposites loading ZB nanoparticles were improved compared with the composites employing commercial ZB microparticles.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77242778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural Characteristics and Cytotoxic activity of Polysaccharide Extracted from Green Seaweed Caulerpa torta 绿海藻多糖的结构特征及细胞毒活性研究

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-07-05 DOI: 10.25073/2588-1140/vnunst.5369

Quanh Thi Minh Thu, D. V. Luong, Do Thi Thanh Xuan, Thanh Thi Thu Thuy

引用次数: 0

Using Biosurfactants from Plants to Treat Chicken Feathers into a Green Oil Absorbent Material 利用植物生物表面活性剂处理鸡毛制备绿色吸油材料

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-06-30 DOI: 10.25073/2588-1140/vnunst.5370

N. Xuan, Nguyen Hoang Trung Hieu, Taros Ly

{"title":"Using Biosurfactants from Plants to Treat Chicken Feathers into a Green Oil Absorbent Material","authors":"N. Xuan, Nguyen Hoang Trung Hieu, Taros Ly","doi":"10.25073/2588-1140/vnunst.5370","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5370","url":null,"abstract":"While feathers are still commonly regarded in many places as waste, in many developed countries it has been considered a valuable by-product of the poultry industry. The poultry industry of Vietnam has achieved encouraging achievements in the past 10 years. The total flock of poultry from 100 million to now has reached nearly 467 million. Though light as a feather, with the vast quantities of chickens produced annually, the number of feathers produced is considerable. Research has shown that the feathers have hydrophobic properties and can therefore be used to make products that absorb oil. However, the use of large amounts of toxic detergents to clean chicken feathers in reported studies has reduced the environmental significance of agricultural waste reuse. In this study, we evaluated the possibility of replacing toxic cleaning agents with eco-friendly natural cleaners in the handling of chicken feathers. Water-based extracts of soapnuts and bo-ket fruits have been selected for our study due to their high saponin content - an effective cleaning agent, and have been used as a dishwashing liquid or shampoo for a long-time by local housewives. Our study showed that natural detergents derived from soapnuts have been shown the ability to remove lards on the plastic surface, and to clean chicken feathers, thereby increasing their capacity to absorb various oils including cooking oil, used cooking oil, and lubricant oil. We have also created an oil-absorbing pillow containing soapnut extract-treated chicken feathers with a maximum efficiency of 16.8 g/g in absorbing lubricant oil. Our research opens new avenues for the use and treatment of poultry feathers, contributing to the reduction of solid waste from the poultry industry by methods which is friendlier to the environment. The greenness of the created absorber is guaranteed.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90275346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical Consituents from Abelmochus Sagitifolius (Kurz) Merr. 星形沙蚊(Kurz) Merr的化学成分。

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-06-30 DOI: 10.25073/2588-1140/vnunst.5399

Thức Ngọc Đinh, Mai Thi Ha Vu, H. Vu, H. Bui

引用次数: 0

A Study on Structure, Stability, Cooperativity and Hydrogen Bond in the Complexes of nHCHO and nH2O (n=1-3) by Quantum Chemical Method nHCHO和nH2O (n=1-3)配合物结构、稳定性、协同性和氢键的量子化学研究

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-06-30 DOI: 10.25073/2588-1140/vnunst.5375

Ho Cong Hau, L. T. Quyen, Ngo Thi Hong Nhung, Ngo Vuong Hoang, Nguyen Truong An, Nguyen Phi Hung, N. T. Trung

引用次数: 0

Density Functional Theory Study on the Insertion Reaction Mechanism of Methylidyne with Ethanol 甲基苯胺与乙醇插入反应机理的密度泛函理论研究

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-06-23 DOI: 10.25073/2588-1140/vnunst.5180

N. T. Nghia

引用次数: 0

Chemical Composition of Euphorbia Hirta L. collected in Dan Phuong, Hanoi 河内丹芳地区大戟的化学成分研究

VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-06-23 DOI: 10.25073/2588-1140/vnunst.5400

T. Loc, P. T. Ninh, Nguyen Thi Luu, T. Chien, T. Anh, Nguyễn Thị Dung, T. T. Thao

引用次数: 0