Acta Scientifica Naturalis最新文献_第3页

Thermodynamic solid-liquid equilibrium model for mixed systems HF-NaF-H2O and HF-KF-H2O up to 2 m HF at T = 25oC T = 25℃时HF- naf - h2o和HF- kf - h2o混合体系高达2 m HF固液平衡模型

Acta Scientifica Naturalis Pub Date : 2023-03-01 DOI: 10.2478/asn-2023-0002

Stanislav Donchev, Tsvetan Tsenov, C. Christov

{"title":"Thermodynamic solid-liquid equilibrium model for mixed systems HF-NaF-H2O and HF-KF-H2O up to 2 m HF at T = 25oC","authors":"Stanislav Donchev, Tsvetan Tsenov, C. Christov","doi":"10.2478/asn-2023-0002","DOIUrl":"https://doi.org/10.2478/asn-2023-0002","url":null,"abstract":"Abstract In this study we developed thermodynamic models for solid-liquid equilibrium for mixed systems HF-NaF-H2O and HF-KF-H2O up to 2 m HF at T = 25oC. Models are developed on the basis of Pitzer ion interactions approach. The recommendations on mean activity coefficients (γ±) have been used to construct the model for HF-H2O system. The models for binary systems NaF-H2O and KF-H2O are taken from our previous study in the same journal [Donchev et al. ASN (2021) 8(2), 1-15]. To parameterize models for ternary systems we used the available solubility data, i.e. on the basis of solubility approach. The thermodynamic solubility products (as ln Kosp) of precipitating in mixed systems double salts [NaF.HF(cr), and KF.HF(cr)] have been determined on the basis of evaluated model ion interaction parameters and using experimental m(sat) solubility data. The model is in a good agreement with experimewnt solubility data in the systems HF–NaF–H2O and HF–NaF–H2O up to maximum HF molality of 2 mol·kg−1. At higher acid molality the model predicts much higher solubility of double salts (NaF.HF(cr) and KF.HF(cr) for both mixed systems. It was concluded that not a correct raw data for binary HF–H2O system used in parameterization are the main reason for concentration restriction of mixed HF models presented here.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48879181","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

Tourism as a prerequisite for changing the national identity 旅游业是改变民族身份的先决条件

Acta Scientifica Naturalis Pub Date : 2023-03-01 DOI: 10.2478/asn-2023-0009

Tsvetelina Metodieva

引用次数: 1

Green infrastructure - the smart interpreting of natural capital 绿色基础设施——自然资本的智慧诠释

Acta Scientifica Naturalis Pub Date : 2023-03-01 DOI: 10.2478/asn-2023-0006

Dora Kabakchieva, V. Vasileva

{"title":"Green infrastructure - the smart interpreting of natural capital","authors":"Dora Kabakchieva, V. Vasileva","doi":"10.2478/asn-2023-0006","DOIUrl":"https://doi.org/10.2478/asn-2023-0006","url":null,"abstract":"Abstract Humanity continues to degrade natural capital, threatening its long-term sustainability. This more and more categorically imposes the need to create a specific green infrastructure - a response to the natural solutions to the accumulating problems (environmental pollution, floods, natural disasters and cataclysms). The failure of decisions to pay sufficient attention to ecological consequences and to apply systematic measures of high quality are among the main reasons for the current situation in most ecosystems. The fast-paced and highly mechanized way of life of modern man creates the illusion of remoteness from the natural world. Yet all human activity depends entirely on ecosystems and their functions and at the same time has (threatening) impacts on them. Therefore, the achievement of greater efficiency in the use of natural resources and the creation of suitable ecological living conditions are critically important goals both for Europe and for the whole world. Green Infrastructure (GI) is a successfully tested tool for providing environmental, economic and social benefits through environmentally sound solutions. Such a tool helps to understand the values provided by nature to human society and mobilizes investments for their maintenance and growth.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46247990","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

For optical flickering in symbiotic star MWC 560 用于共生恒星MWC 560的光学闪烁

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0017

D. Marchev, K. Stoyanov, V. Marchev, R. Zamanov, B. Borisov, Doroteq Vasileva, T. Atanasova, Nataliya Pavlova

引用次数: 0

Survey on current status of folk medicine in Bulgaria reported by local knowledgeable persons 当地知情人士报告的保加利亚民间医学现状调查

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0021

A. Dragoeva, Z. Stoyanova, M. Marinov, Vanya Koleva

{"title":"Survey on current status of folk medicine in Bulgaria reported by local knowledgeable persons","authors":"A. Dragoeva, Z. Stoyanova, M. Marinov, Vanya Koleva","doi":"10.2478/asn-2022-0021","DOIUrl":"https://doi.org/10.2478/asn-2022-0021","url":null,"abstract":"Abstract Traditional knowledge is of real danger to be lost in modern society. This research is a part of an ethnobotanical survey aimed on documentation of current status of folk medicine in Central and Northeastern Bulgaria. Semi-structured interviews with local knowledgeable persons were provided. Quantitative ethnobotanical indices consisting of Fidelity level (FL) and Informant consensus factor (ICF) were calculated as indicatives of local importance of species and prevalent uses of species. The respondents reported 15 category uses: to treat 12 health disorders, for prophylaxis/immune stimulation, other health connected conditions and plants included in the diet as food/spices. The highest number of plants was used for the treatment of gastrointestinal diseases (65.9%), cardiovascular problems (53.4%) and urinary system problems (46.6%). It should be noted that many herbal medicines are related to disease prevention (52.3%). Maximum FL value (100%) of Hypericum perforatum for digestive and nervous system disorders and Thymus sp. for respiratory system diseases was calculated. Numerous species and specific applications were listed in the paper, contributing to the base ethnobotanical data. Specific use categories indicate most spread health disorders and proved treatments in the studied regions. Results also reflect the growing interest in disease prevention (immune stimulation) and a healthy diet.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48074049","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

Interaction of the birch-bark terpenoids with human and bovine serum albumins 桦树皮萜类化合物和人、牛血清白蛋白的相互作用

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0019

K. Kalchev, I. Hristova, Gergana Manova, Lyubomir Е Manov

引用次数: 0

Editorial Note: The Botanical Garden in Balchik – harmonious coexistence between Man and Nature 编者按：巴尔奇克植物园——人与自然和谐共生

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0016

D. Zahariev.

引用次数: 0

Structural characterization of an exopolysaccharide produced by Lactobacillus plantarum Ts 植物乳杆菌Ts胞外多糖的结构表征

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0022

Stephany Toschkova

{"title":"Structural characterization of an exopolysaccharide produced by Lactobacillus plantarum Ts","authors":"Stephany Toschkova","doi":"10.2478/asn-2022-0022","DOIUrl":"https://doi.org/10.2478/asn-2022-0022","url":null,"abstract":"Abstract An exopolysaccharide (EPS) was isolated from Lactobacillus plantarum Ts and purified by size exclusion chromatography train. L. plantarum showed the highest production (9.4 ± 0.8 g/l) of EPS. Furthermore, L. plantarum was cultured in medium with volume of 5 L and the EPS was extracted by ethanol precipitation. By HPLS analysis demonstrated, that the EPS has two fractions - polymer and olygomer. The molecular mass of the EPS from both fractions is respectively 8.3x104 Da for the greater pic and 5.0x102 Da. Fourier transform infrared spectroscopy analysis showed the presence of hydroxyl and carboxyl groups and glycosidic linkages. TLC analysis indicated that the EPS was a heteropolymer composed of fructose, and sucrose as monomeric constituent units. The strain L. plantarum and pathogenic E. coli 3398, St. aureus 745, B. subtilis 6633, S. typhimurium 3591, L. monocytogenes 863 and E. aerogenes 3691 were tested for their growth utilizing the EPS from L. plantarum as the sole carbon source for its possible use as a prebiotic. L. plantarum exhibited growth in the EPS supplied medium compared with sucrose as carbon source, whereas the pathogenic strains did not grow in the EPS-supplied medium. In vitro evaluations showed that, like other reported polysaccharides, this EPS displayed significant prebiotics properties.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46675358","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

Optimizing the processing of large amounts of spatial data related to the ecosystem water service provided by forest territories 优化处理与森林地区提供的生态系统水服务有关的大量空间数据

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0018

R. Miltchev, N. Shuleva, Galin Milchev

{"title":"Optimizing the processing of large amounts of spatial data related to the ecosystem water service provided by forest territories","authors":"R. Miltchev, N. Shuleva, Galin Milchev","doi":"10.2478/asn-2022-0018","DOIUrl":"https://doi.org/10.2478/asn-2022-0018","url":null,"abstract":"Abstract Nowadays, an increased interest towards the integration of the concept of ecosystem services has been observed, both in regards to processes related to forest and water resources management, as well as in the context of sustainable development of the economy on a local, regional and national level. In the most common case, what is referred to as forest ecosystem services are possible benefits, which man can reap directly or indirectly from ecosystem functions of forest territories. Therefore, it is of great importance to analyse and assess the interactions between the human factor with the conditions and processes through which forest ecosystems create and sustain ecosystem services. The water ecosystem service provided by forest territory could cause the need to process large amounts of spatial data in the form of forest management and hydrological information, as well as information about sanitary protection zones around water sources, in the context of the administrative territorial division of the country at different levels, creates considerable challenges. The difficulties are due to both the various electronic formats in which the necessary information is maintained, and the need to perform different operations on the input data for the purpose of analysis and decision making. The present paper investigates the possibilities of automating the processing of large volumes of spatial data in the context of the ecosystem water service, provided by forest territories by developing a set of tools operating into the environment of open source GIS. The main purpose is to develop a unified approach based on the use of GIS and suitable for the creation and implementation of methods for analysis and management of processes related to the ecosystem water service provided by forest territories. The approach can be applied in different sectors of the economy, public relations and the environment.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47362099","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

Duration of fungicide activity against wheat powdery mildew 杀菌剂对小麦白粉病的活性持续时间

Acta Scientifica Naturalis Pub Date : 2022-11-01 DOI: 10.2478/asn-2022-0023

M. Koleva, Y. Stanoeva, A. Ivanova, P. Chamurliyski

{"title":"Duration of fungicide activity against wheat powdery mildew","authors":"M. Koleva, Y. Stanoeva, A. Ivanova, P. Chamurliyski","doi":"10.2478/asn-2022-0023","DOIUrl":"https://doi.org/10.2478/asn-2022-0023","url":null,"abstract":"Abstract The most commonly used method to control wheat powdery mildew is by fungicides. The aim of the present study is to determine the duration of the fungicide activity of three fungicides: azoxystrobin; triadimenol; tebuconazole+spiroxamine+triadimenol. They were applied in three concentrations in phenophase 3-4 leaf of susceptible wheat variety. After treatment, each day one pot of the tested fungicide concentrations was inoculated with Blumeria graminis f. sp. tritici. When using azoxystrobin at concentrations of 0.2%, 0.4%, 0.8%, symptoms of powdery mildew appeared on plants inoculated with Blumeria graminis f.sp. tritici in the next day after treatment. When using triadimenol, first symptoms appeared in plants inoculated with the pathogen on the next day after applying a concentration 0.12%, on the second day after applying a concentration 0.25% and on the third day after treatment with a concentration 0.5%. With tebuconazole+spiroxamine+triadimenol, first postules appeared on plants inoculated with Blumeria graminis f. sp. tritici on the third day after treatment with a concentration 0.15%, on the 13th day after treatment with a concentration 0.3% and on the 14th day after treatment with a concentration 0.6%. This fungicide at a concentration of 0.6% (13 days) and 0.3% (12 days) has the longest duration of fungicide activity.","PeriodicalId":7171,"journal":{"name":"Acta Scientifica Naturalis","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47604598","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