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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 201 - 265 of 265 Journals sorted by number of followers
Quantum Science and Technology     Hybrid Journal   (Followers: 17)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 15)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
Patterns     Open Access   (Followers: 9)
Revista de la Sociedad Científica del Paraguay     Open Access   (Followers: 7)
RAC: Revista Angolana de Ciências     Open Access   (Followers: 7)
Research     Open Access   (Followers: 6)
The Innovation     Open Access   (Followers: 6)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Frontiers in Climate     Open Access   (Followers: 5)
Discover Sustainability     Open Access   (Followers: 5)
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
International Journal of Culture and Modernity     Open Access   (Followers: 5)
History of Science and Technology     Open Access   (Followers: 5)
Data     Open Access   (Followers: 4)
Science & Technology Studies     Open Access   (Followers: 4)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of Big History     Open Access   (Followers: 4)
MUST : Journal of Mathematics Education, Science and Technology     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
People and Nature     Open Access   (Followers: 4)
Middle European Scientific Bulletin     Open Access   (Followers: 4)
Citizen Science : Theory and Practice     Open Access   (Followers: 3)
Research Policy : X     Open Access   (Followers: 3)
Revista Saber Digital     Open Access   (Followers: 3)
iScience     Open Access   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Acta Nova     Open Access   (Followers: 2)
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 2)
Rekayasa     Open Access   (Followers: 2)
Indian Journal of History of Science     Hybrid Journal   (Followers: 2)
Jaunujų mokslininkų darbai     Open Access   (Followers: 2)
Journal of Alasmarya University     Open Access   (Followers: 2)
BJHS Themes     Open Access   (Followers: 2)
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Revista Científica de la Universidad Nacional del Este     Open Access   (Followers: 2)
Scientific Bulletin     Open Access   (Followers: 1)
Global Journal of Science Frontier Research     Open Access   (Followers: 1)
Impact     Open Access   (Followers: 1)
International Journal of Research in Science     Open Access   (Followers: 1)
Journal of Science and Technology     Open Access   (Followers: 1)
Uluslararası Bilimsel Araştırmalar Dergisi (IBAD)     Open Access   (Followers: 1)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Scientonomy : Journal for the Science of Science     Open Access   (Followers: 1)
Revista Vivências em Ensino de Ciências     Open Access   (Followers: 1)
PENDIPA : Journal of Science Education     Open Access   (Followers: 1)
Journal of Science and Engineering     Open Access   (Followers: 1)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
AAS Open Research     Open Access   (Followers: 1)
ARPHA Conference Abstracts     Open Access   (Followers: 1)
Rihan Journal for Scientific Publishing     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 1)
Natural Sciences Education     Hybrid Journal   (Followers: 1)
South American Sciences     Open Access   (Followers: 1)
International Science and Technology Journal of Namibia     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Research Integrity and Peer Review     Open Access  
Journal of Responsible Technology     Open Access  
Natural Sciences     Open Access  
Türk Bilim ve Mühendislik Dergisi     Open Access  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
Vilnius University Proceedings     Open Access  
Sciential     Open Access  
ARPHA Proceedings     Open Access  
Gaudium Sciendi     Open Access  
Crea Ciencia Revista Científica     Open Access  
Rafidain Journal of Science     Open Access  
Journal of Al-Qadisiyah for Pure Science     Open Access  
Revista Tecnológica     Open Access  
Himalayan Journal of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access  
Universidad, Ciencia y Tecnología     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Revista Politécnica     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Jurnal Ilmiah Ilmu Terapan Universitas Jambi : JIITUJ     Open Access  
Revista Eletrônica Ludus Scientiae     Open Access  
Emergent Scientist     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Archives of Current Research International     Open Access  
Advances in Research     Open Access  
International Journal of Applied Science     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
J : Multidisciplinary Scientific Journal     Open Access  
Revista Binacional Brasil - Argentina: Diálogo entre as ciências     Open Access  
Revista Ciencia y Tecnología     Open Access  
Journal of Institute of Science and Technology     Open Access  
Journal of Science (JSc)     Open Access  
WikiJournal of Science     Open Access  
Acta Materialia Transilvanica     Open Access  
Integrated Research Advances     Open Access  
Open Conference Proceedings Journal     Open Access  
Naturen     Full-text available via subscription  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Sci     Open Access  
Maskana     Open Access  
Hoosier Science Teacher     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Facets     Open Access  
Adıyaman University Journal of Science     Open Access  
Revista Brasileira de Iniciação Científica     Open Access  
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Scientific African     Open Access  
Scientific Journal of Mehmet Akif Ersoy University     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Gazi University Journal of Science     Open Access  
Middle East Journal of Science     Open Access  
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
Bulletin of the National Research Centre     Open Access  
Uni-pluriversidad     Open Access  
ConCiencia     Open Access  
Ciencia y Tecnología     Open Access  
Revista Bases de la Ciencia     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Ciência ET Praxis     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
International Annals of Science     Open Access  
Science Heritage Journal     Open Access  
Bilge International Journal of Science and Technology Research     Open Access  
Avrasya Terim Dergisi     Open Access  
International Scientific and Vocational Studies Journal     Open Access  
TÜBAV Bilim Dergisi     Open Access  
LOGIKA Jurnal Ilmiah Lemlit Unswagati Cirebon     Open Access  
Dalat University Journal of Science     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Respuestas     Open Access  
Science Diliman     Open Access  
Instruments     Open Access  
Revista Científica y Tecnológica UPSE     Open Access  
HardwareX     Open Access  
Sultan Qaboos University Journal for Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Revista de Información Científica     Open Access  
Indonesian Journal of Fundamental Sciences     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Jurnal Natural     Open Access  
Frontiers for Young Minds     Open Access  
Revista Ciência, Tecnologia & Ambiente     Open Access  
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Negative and No Positive Results     Open Access  
Revista Conhecimento Online     Open Access  
Nova     Open Access  
CienciaUAT     Open Access  
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Makara Journal of Science     Open Access  
Jurnal Sains Dasar     Open Access  
Indonesian Journal of Science and Technology     Open Access  
Ethiopian Journal of Science and Technology     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  
Heidelberger Jahrbücher Online     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
Estação Científica (UNIFAP)     Open Access  
The Winnower     Open Access  

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Iranian Journal of Science and Technology, Transactions A : Science
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1028-6276 - ISSN (Online) 2364-1819
Published by Springer-Verlag Homepage  [2468 journals]
  • Study the Effect of Colored and White LED Light Radiation on the
           Biological Activity of Desmonostoc alborizicum Cultivated Under Modified
           BG-110 Medium Composition

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      Abstract: Abstract The present effort intends to evaluate the influence of different wavelengths of LED lights on the biological activity of cyanobacterial species of the native toxic Iranian cyanobacteria strain Desmonostoc alborizicum strain 1387 cultivated under abiotic stresses for 30 days. The phycobiliproteins, dry weight, specific growth rate, and cell doubling time were measured. Furthermore, an assessment was conducted on phytochemical substances such as phenolic, flavonoid, and tannin levels, as well as defense enzymes and antioxidant activity. Additionally, the cytotoxic evaluation was conducted using the MTT test and GC–MC analysis. The results of the concentration and purity of pigments showed that the highest amount belonged to blue light (470 lx) and red light (660 lx). Biomass and SGR amounts were the greatest under white light conditions. Based on antioxidant activity, blue light showed the highest activity by the DPPH method. Phenolic and flavonoid contents were lower under blue light conditions, while they showed a higher amount in other treatments without significant differences. The results of the measurement of catalase and glutathione s-transferase enzymes had higher activity when studied in strains grown under green light (520 lx), while white light showed the highest activity for the SOD enzyme. The findings of gas chromatography demonstrated that 3-methylbutanal, 2-methylbutanal, 2-methylpropanol, and 3-methyl-1-butanol were higher in the red light condition. In conclusion, the results of this study showed that red and blue light treatments had a significant effect on the biological activity of Desmonostoc alborizicum cultivated under nitrogen and sulfur stress.
      PubDate: 2024-02-17
       
  • Investigation of Color Removal Mechanisms of Raw and Calcinated Eggshells,
           and Their Photocatalytic Properties for Selected Dyes

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      Abstract: Abstract The present study thoroughly explores the efficacy of both raw and calcined eggshells in the removal of various dyes from wastewater. It was found that some studies have misinterpreted this phenomenon for certain dyes. The study specifically examines the ability of raw eggshell (RES) and calcinated eggshell (CES) to remove three dyes: fuchsine dye (FD), malachite green (MG), and methylene blue (MB). The research aims to determine whether the color removal is due to a photocatalytic process or a change in solution pH. Various methods were used to characterize the eggshell-derived photocatalysts, including diffuse reflectance UV–Vis spectroscopy (DR-UV–Vis), Fourier transform-infrared spectroscopy (FTIR), and electrochemical methods such as electrochemical impedance spectroscopy (EIS), photocurrent measurements, and Mott–Schottky analyses. In this study, it was found that the photocatalytic effect of RES and CES for FD and MG is not significant, while a noticeable photocatalytic effect was observed for MB. Therefore, it was concluded that some eggshell-based dye removal processes are not due to their photocatalytic properties; instead, the shift in solution color is linked to a change in pH.
      PubDate: 2024-02-15
       
  • Mobility and Decoherence of Bipolaron in Transition Metal Dichalcogenides
           Pseudodot Quantum Qubit

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      Abstract: Abstract In this work, we investigated the mobility and decoherence of bipolaron in transition metal dichalcogenides pseudodot quantum qubit using the Huybrecht method. We investigated the mobility of the bipolaron and the ground and first excited state energies and highlighted that the qubit can be formed in superposition state of the system. The decoherence of this qubit is observed throughout the spontaneous emission of the phonon. Transition frequency, density probability and Shannon entropy are evaluated in order to characterize the decoherence phenomenon. We found that the chemical potential of the two-dimensional electron gas increases the mobility and the transition frequency but decreases the decoherence time. It is also seen that the zero point of the pseudo-harmonic potential decreases the mobility and the transition frequency and increases the decoherence time, thus decreasing the zero point of pseudo-harmonic potential resulting to large transition frequency, which destroys the decoherence. We found that bipolaron moves more freely in WS2 monolayer. We also found that the chemical potential of the two-dimensional electron gas and the zero point of the pseudo-harmonic potential are useful to information transfer, to destroy decoherence of bipolaron state and also permit to control the state of the system.
      PubDate: 2024-02-13
       
  • Green Synthesis of Silver Nanoparticles Using Petai (Parkia speciosa
           Hassk.) Seed: Characterization, Stability Study, and Antibacterial
           Activity

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      Abstract: Abstract Nanoparticles have great potential in medicinal aspects. Among metal nanoparticles, silver nanoparticles (AgNPs) are very popular because of their ability to act in many treatments such as antibacterial, antifungal, antioxidant, anticancer, antidiabetic, and anti-inflammatory. In this study, we synthesized AgNPs by using a safe and non-toxic method (green method) using petai seed extract. Extract can be useful as a reductor and stabilizer agent in the synthesis of AgNPs. The AgNPs were characterized by UV–Vis spectroscopy, zeta sizer, SEM–EDX, TEM, and FTIR. The antibacterial effects of The AgNPs were studied by disk diffusion and microdilution methods against Staphylococcus aureus and Escherichia coli. The UV–Vis spectrum showed a peak at 424 nm, an average particle size of 116.5 ± 1.07 nm with PDI of 0.193 ± 0.01, and a zeta potential of − 13.5 ± 0.2 mV. The SEM–EDX and TEM confirmed that AgNPs have a spherical shape. The FTIR spectra showed a shift in the AgNPs wavelength which confirmed the reduction process. Moreover, the disk diffusion test showed that AgNPs and silver nitrate at a concentration of 5000 µg/mL create inhibition zone of 13.4 ± 3.8 and 11.5 ± 0.5 for S. aureus; 11.9 ± 1.3 and 13.1 ± 1.4 mm for E. coli, respectively. Microdilution test showed that kanamycin, AgNPs, and silver were able to inhibit the growth of S. aureus with MIC, respectively, of 11.5, 115.6, and 2797.3 µg/mL; and E. coli with MIC, respectively, of 4.0, 1264.3, and 1771.0 µg/mL. These results suggest that AgNPs can be synthesized by using petai seed and have the ability as an alternative antibacterial agent.
      PubDate: 2024-02-09
       
  • In-depth Study of Radioactive Isotope Profiles 234U, 235U, and 238U in
           Earth Samples from the Missour Region, Morocco: A Detailed Exploration of
           Nuclear Activity

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      Abstract: Abstract This study aims to assess the activities of radioactive isotopes 234U, 235U, and 238U in earth samples collected from the Missour region in Morocco using alpha spectrometry. The samples were collected at different depths (0 cm, 10 cm, and 20 cm), and their mass, as well as the tracer mass, was accurately measured. The results showed significant variations in isotope activities depending on the depth. The activities of 234U and 238U increased with depth, while the activity of 235U showed a less pronounced increase. These observations suggest the influence of geochemical processes and soil composition on the distribution of isotopes. These findings contribute to our understanding of natural radioactivity in the region and underscore the importance of monitoring radiation levels to assess environmental and human health risks.
      PubDate: 2024-02-08
       
  • Functional Significance of the C-Terminal Domain of Human Interferon
           Regulatory Factor-1 (IRF-1) in Gene Expression and Cell Cycle Regulation

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      Abstract: Abstract Interferon regulatory factor-1 (IRF-1) is a transcription factor in humans that plays a crucial role in creating an antiviral state in infected cells and regulating cell cycle progression. Human IRF-1 is a modular protein with different functional domains. To investigate its functionality, we generated a truncated mutant version of human IRF-1, containing amino acids 1 to 233, compared to the wild-type IRF-1 with 325 amino acids (aa). We employed semi-nested PCR and techniques of cloning genes in both E. coli and mammalian expression vectors to produce the recombinant truncated Glutathione S-transferases tagged IRF-1 protein of molecular weight approximately 52 kDa. 12.5% SDS-PAGE was used to verify the expression of the protein. We introduced the truncated and wild-type IRF-1 into Human Embryonic Kidney cell lines HEK293 and HEK293T and detected the recombinant proteins using immunoblotting. Interestingly, the truncated IRF-1 (∆ IRF-1) version had no impact on the chromosomal genes including Bax, Bcl-2, and Cyclin D1. Furthermore, the MTT experiment showed that HEK293 and HEK293T cells were unaffected by the mutant IRF-1 in terms of proliferation and division. These results emphasize the importance of human IRF-1's amino acids 234–325 for the expression of the Bax, Bcl-2, and Cyclin D1 genes in this experimental paradigm. Consequently, this research offers significant information regarding the role of the human IRF-1 C-terminal domain.
      PubDate: 2024-02-08
       
  • Novel Fe3O4–ZnO Carbonized Rice Husk Modified Nano Composite Sorbent for
           Removal of Humic Acid from Aqueous Media

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      Abstract: Abstract In this study, we used a novel absorbent ZnO/Fe3O4/carbonized rice husk (CRH) composite for removal of humic acid (HA) from aqueous solutions. The ZnO/Fe3O4/CRH composite was produced via chemical procedure under heating and vigorous stirring conditions. The ZnO/Fe3O4/CRH were characterized by SEM, FT-IR, XRD and VSM techniques. The analysis results show that the ZnO/Fe3O4/CRH can be used as an appropriate adsorbent. Variables affecting the adsorption of humic acid such as: pH, HA concentration, adsorbent amount and contact time were investigated. The kinetics of adsorption of HA on ZnO/Fe3O4/CRH composite could be expressed by the pseudo-second order kinetic model and Langmuir model was found to be more applicable in interpreting between mentioned adsorbent and adsorbent as suitable adsorption isotherms. Furthermore, the ZnO/Fe3O4/CRH nanocomposites could be also served as convenient recyclable sorbent because of their magnetic properties.
      PubDate: 2024-02-08
       
  • Characterization of Deferred Statistical Convergence of Order $$\alpha $$
           for Positive Linear Operators and Application to Generalized Bernstein
           Polynomials

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      Abstract: Abstract In the present paper, we establish the Korovkin type theorems concerning positive linear operators defined for functions on [a, b] and also for functions on \([0,\infty )\) , via deferred statistical convergence of order \(\alpha\) , \((0<\alpha \le 1)\) . Further, we illustrate the application of our study to the generalized Bernstein polynomials introduced by Cao (J Math Anal Appl 209:140–146, 1997) and furnish an example to show that our Theorem 3 is a non-trivial generalization of the classical Korovkin type theorem.
      PubDate: 2024-02-08
       
  • A Novel Sensing Platform Based on Metal Tungstate/g-C3N4 Nanocomposite for
           the Sensitive Electrochemical Detection of Ascorbic Acid

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      Abstract: A novel NiWO4/CuWO4/g-C3N4 (NCWG) nanocomposite with excellent electrocatalytic activity was prepared and deposited on Indium-Tin Oxide (ITO) electrode for the electrochemical detection of ascorbic acid (AA). The two-dimensional dispersion of NiWO4 and CuWO4 on the g-C3N4 surface gave a more electroactive surface, subsequently influencing the current intensity of the electro-oxidation of AA. A significant increase of the oxidation current peak of AA at NCWG/ITO was observed and compared to the one obtained at other modified or unmodified ITO electrodes. The analytical parameters of the working electrode NiWO4/CuWO4/g-C3N4 vs. Ag/AgCl at an applied potential of − 0.05 V were reported utilizing the amperometric technique. A linear correlation between peak current and AA concentration in the range of 0.1 to 100 μM was obtained with a detection and quantification limits of 0.1 μM/L and 0.35 μM/L, respectively, and a sensitivity of 1.22 µAµM−1 cm−2. The novel sensor reveals sensitivity, reliability, and stability, allowing the sensitive determination of AA in tap water samples with satisfactory recoveries. Graphic
      PubDate: 2024-02-07
       
  • Comparative in Silico Analysis of Fungal and Bacterial Alkaline Serine
           Proteases: Insights into Structure, Function, and Evolution

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      Abstract: Abstract Serine proteases are an essential and immensely diverse group of enzymes found in many different organisms, from mammals to viruses. Alkaline serine proteases (ASPs) are a type of serine protease that exhibit their highest activity levels in alkaline conditions. These enzymes play a critical role across a wide range of industries, providing immense value and benefits. ASPs are produced mainly by bacteria and fungi on industrial scales. The present study involved an analysis of various sequences of alkaline serine proteases derived from fungi and bacteria. The analytical approach employed encompassed the assessment of the pseudo amino acid composition (PseAAC), the tripeptide composition (TPC), physicochemical properties, secondary structures, and conserved motifs. Motif discovery and analysis showed that a considerable majority of bacterial alkaline serine protease sequences (over 94%) and fungal alkaline serine protease sequences (99%) in the dataset were associated with the subtilisin-like serine protease superfamily. This finding highlights the prevalence of this particular superfamily in alkaline serine protease sequences and provides valuable insight into the evolutionary relationships between different protease families. Based on the results of the study, the utilization of PseAAC and TPC techniques was successful in categorizing fungal and bacterial ASPs into separate groups. This was made possible by precise predictive models generated using machine learning algorithms. Bacterial and fungal ASPs had no significant differences in amino acid composition, ProtParam features, and GORIV secondary structure prediction outcomes. This underscores the importance of TPC and PseAAC concepts in accurately clustering and predicting ASP sequences.
      PubDate: 2024-02-06
       
  • An Efficient Higher-Order Numerical Scheme for Solving Fractional
           Black-Scholes PDE Using Analytical Weights

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      Abstract: Abstract This paper presents an efficient numerical approach employing RBF-HFD to tackle fractional option pricing. This scheme as an extension of the RBF-FD technique, offers solutions for partial differential equations (PDEs) via higher order formulas. In this work, we focus on computing analytical weights and to use them in our numerical method directly. The suggested approximations are customized using the multiquadric RBF and three-point uniform stencils for spatial discretization. Numerical results are provided to validate the underlying theory.
      PubDate: 2024-02-06
       
  • Implications of Particle Recycling on Core Plasma Performance in Advanced
           Aneutronic Fuel Spherical Tokamak Reactor

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      Abstract: Abstract A volume average particle and energy equations are applied to study the effects of particle recycling on plasma parameters for aneutronic deuterium and helium-3 (D- \({^3}\) He) fuel cycle. The presented simulation study shows the core plasma performance while with and without recycling particle are utilized. It is found that the recycled particle has a significant impact on the D- \({^3}\) He fuel parameters. Finally, with the aid of the operation path method on the n \(_e\) -T plane on the background of the plasma operating contour (POPCON) line, the plasma behavior for both cases is compared.
      PubDate: 2024-02-06
       
  • Elastic, electronic, and optical properties of monolayer MnBi2Se4

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      Abstract: Abstract We investigated the elastic properties, bandgap, and optical spectra of monolayer MnBi2Se4 using a combination of density functional theory, as carried out in the Quantum Espresso code. Young’s modulus and Poisson’s coefficient were calculated. The AFM \(MnBi_{2} Se_{4}\) monolayer within GGA + U exhibits semiconducting behavior using spin–orbit coupling. In the low-energy range, \(MnBi_{2} Se_{4}\) provides the conditions for the existence of the transverse-electric mode. Our results suggest that \(MnBi_{2} Se_{4}\) is a good candidate for ultraviolet absorber materials for optoelectronic and adsorbent surfaces in solar cell applications and spin transistors.
      PubDate: 2024-02-06
       
  • Investigating Inter- and Intra-specific Karyotypic Diversity of Some
           Species of Salvia Genus in Iran

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      Abstract: Abstract The Salvia genus, an important member of the Lamiaceae family, is extensively utilized in the food and pharmaceutical industries. To investigate the karyotypic diversity of this genus, chromosomal studies were conducted on 25 populations belonging to eight different species. Various karyotypic traits were measured and evaluated. With the exception of the tetraploid species S. verticillata L., all other species were diploid. The basic chromosome numbers observed in different species were x = 8, 10, and 11. Among the species, S. glutinosa L. exhibited the highest relative chromatin values (VRC); while, S. spinosa L. had the lowest VRC. In terms of intra-chromosomal asymmetry, the species S. macrosiphon Boiss. displayed the most symmetrical karyotype; whereas, the population of S. glutinosa (243) had the most asymmetrical karyotype. In relation to inter-chromosomal asymmetry, S. reuteriana Boiss. (30,344) exhibited the most asymmetric karyotype. Statistically significant differences (p < 0.01) were observed among the different populations and species in terms of all chromosomal characteristics. Principal components analysis revealed that the first, second, and third components represented parameters related to intra-chromosomal asymmetry, inter-chromosomal asymmetry, and chromosomal length, respectively. Cluster analysis grouped the various populations and species into six different classes. The smallest genetic distance was observed between populations of S. limbata C.A. Mey. (33,295 and 36,916) species; while, the highest genetic distance was found between S. reuteriana Boiss. (20) and S. glutinosa L. (242). In terms of karyotypic evolution, there was no significant difference between different chromosomal basic (x), but more karyotypic evolution was observed among populations with x = 10. Flow cytometry measurements showed that 2C DNA contents varied from 1.65 to 1.88 pg in diploid species and with a 2C value of 2.84 pg being obtained for a tetraploid species. The relative fluorescence intensity (RFI) of propidium iodide-stained nuclei was a function of the number of chromosome sets (x), as shown by the linear equation RFI = 3.7x − 2.4 (R2 = 93%). The data indicated that DNA flow cytometry can be useful for determining the ploidy level in seedling stage in salvia genus. Also, the conventional polyploid evolution of increasing nuclear DNA content has occurred simultaneously with increasing chromosome number. Finally, in this study, the evolutionary relationships of chromosomes with plant morphology and molecular studies have been discussed. The results provide basic data for further studying on genomics, cytobiology and germplasm resource for Salvia genus.
      PubDate: 2024-02-04
       
  • Methyl Green Dye Adsorption from Wastewater Using Coconut Husk
           Biosorbents: Kinetic, Isotherm and Thermodynamic Studies

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      Abstract: Abstract In this study, we prepared treated (TCH) and untreated (UCH) biosorbents from coconut husks for the sustainable removal of methyl green (MG) dye from aqueous solutions using batch adsorption mode. The products were characterized by Fourier transform infrared (FT-IR), scanning electron microscope (SEM), energy-dispersive X-ray, and N2 adsorption/desorption methods. The performance evaluation for the MG adsorption by the adsorbents was done under different variables such as contact time, solution pH, initial dye concentration, temperature, and adsorbent dosage. The experimental data were analysed by adsorption kinetics isotherm, and the thermodynamic parameters were evaluated. FTIR, SEM, and N2 adsorption/desorption analysis results showed that the adsorbents have functional groups, porous structure, and large surface area, suitable for adsorption. The highest percentage of 93.47 and 99.11% of MG dye were obtained by UCH and TCH, respectively, with an initial pH of 7, contact time of 60 min, adsorbent dosage of 1.0 g, initial MG concentration of 20 mg/L, and temperature of 298 K. The results of the adsorption model predicted the Langmuir isotherm could best represent the adsorption process and can best be described by pseudo-second-order kinetics. Thermodynamic parameters declared that the adsorption of the MG onto UCH and TCH is non-spontaneous, feasible, favourable, endothermic, and chemosorption. The present study showed that UCH and TCH could be cheaper, safer and more effective biosorbents for removing MG from an aqueous medium.
      PubDate: 2024-02-01
       
  • Systematic Study of Even–Even Hafnium Isotopes by Using Projected
           Shell Model

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      Abstract: Abstract Projected shell model (PSM) is used in this study to calculate reduced electric quadrupole transition probabilities B(E2) of even-even Hf isotopes (A=164−170). The calculations include the determination of the quadrupole moments, and the results are compared to experimental data. We have also investigated the Yrast spectrum and the backbending phenomenon for these isotopes. By comparing the PSM model results with experimental data, the agreement seems very good.
      PubDate: 2024-02-01
       
  • Sodium Arsenite Impacts the Development of the Toad Bufotes viridis

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      Abstract: Abstract Sodium arsenite (NaAsO2 = NA) is mainly released into the environment from anthropogenic sources such as mining and pesticides. This study examined the effects of NA on the development of Bufotes viridis by exposing eggs and larvae to NA at 11 different concentrations including absence of NA (control) and comparing their developmental patterns. the seven lowest concentrations are often found in the environment (500, 1000, 1500, 2000, 6000, 12,000, 24,000, 25,000, 32,000, 36,000 µg/l). Our results suggest that low concentrations of NA positively affect growing larvae of B. viridis by increasing their length and maximum swimming speed compared to the control group. However, high concentrations of NA significantly reduced the larval growth and swimming speed compared to the control group. LC50 values were found for B. viridis eggs at NA concentration of 260,000 µg/l after nine days of exposure. A high mortality rate and both internal and external abnormalities (e.g. hepatocytes and intestinal epithelium reduction, abdominal oedema and tail flexures) were observed at high concentrations, suggesting that NA can have important effects to those environmentally relevant NA levels.
      PubDate: 2024-01-28
       
  • Facile Synthesis of MFe2O4/RGO (M = Ni, Co) Nanocomposites and Their
           Application in the Reduction of 4-Nitrophenol

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      Abstract: Abstract In this study, magnetic MFe2O4 (MFO, M = Ni, Co)/RGO heterogeneous catalysts have been synthesized by a facile solvothermal method. To characterize their morphological, structural, magnetic, and optical properties, the materials were analyzed by complementary chemical–physical methods. Moreover, the obtained results were compared with those obtained from pristine MFe2O4 and individual synthesized RGO. The MFO/RGO composites are composed of thin RGO layers and approximatively spherical aggregates of small crystalline MFO nanoparticles. The reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of sodium borohydride was applied to access the catalytic activity of the synthesized composites. Among these synthesized materials, NiFe2O4/RGO was highly active in this reaction. The combination of RGO layers and NiFe2O4 nanoparticles is assumed to be responsible for its high activity. Furthermore, NFO/RGO was catalytically active for six cycles adding fresh 4-nitrophenol (4-NP) to the reaction mixture.
      PubDate: 2024-01-28
       
  • Fabrication of pH-Responsive Amphiphilic Poly(Vinyl Alcohol–Methyl
           Methacrylate) Copolymer Nanoparticles for Application in Cancer Drug
           Delivery Systems

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      Abstract: Abstract Cancer cells acidify their environment as they proliferate. Therefore, it is important to prepare amphiphilic polymer nanoparticles that are sensitive to pH. This study aimed to prepare pH-sensitive colloidal amphiphilic polyvinyl alcohol–methyl methacrylate (PVA–PMMA) copolymers for cancer therapy applications. First, poly(vinyl acetate–methyl methacrylate) (PVAc–PMMA) copolymer nanoparticles were synthesized in different polymerization medium fractions from water and methanol and different monomer feed concentrations. Then, the PVA–PMMA nanoparticles were obtained by hydrolysis of acetate groups. These particles are sensitive to pH changes and swell in acidic environments. Notably, the preparation procedure of such pH-responsive methotrexate (MTX)-loaded carriers was innovatively designed to be advantageous in cancer therapy. MTX is an amphiphilic drug used for chemotherapy. Regarding the characterization, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis were used to identify the structural and morphological changes along with environmental pH change. The MTX loaded into the nanoparticles and release profile showed that this amount was significant in acidic environments. The cell toxicity of nanoparticles with and without MTX was investigated. The results established that PVA–PMMA copolymeric nanoparticles have the potential to be used in cancer therapy.
      PubDate: 2024-01-25
       
  • High-Performance Plasmonic Sensor Using Indium Nitride–Tungsten
           Disulphide Heterostructure for Bio-Sensing Applications

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      Abstract: Abstract The performance of a surface plasmon resonance (SPR)-based sensor is investigated theoretically in the presence of a heterostructure composed of indium nitride (InN) and two-dimensional materials. The sensitivity of the four-layer SPR configuration (i.e. BK7 glass/silver/InN/sample medium) is found as 148.64 (0/RIU). After including the heterostructure, the sensitivity enhances by 2.979% for InN–graphene; however, InN-transition metal dichalcogenide (TMDC) provides superior performance. The InN-WS2 heterostructure provides the highest sensitivity among all with a value of 175.838 (0/RIU) which is 18.297% greater than the initial four-layer configuration. Additionally, the improved figure of merit and detection accuracy values are found as 71.771(RIU−1) and 1.135, respectively. The intensity of evanescent electric field at the interface is also maximum and its value is observed 1.73E-04 V/nm at resonance. As a result, the proposed sensor can be used to detect very small refractive index change and also be beneficial for bio-sensing applications.
      PubDate: 2024-01-24
       
 
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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 201 - 265 of 265 Journals sorted by number of followers
Quantum Science and Technology     Hybrid Journal   (Followers: 17)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 15)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
Patterns     Open Access   (Followers: 9)
Revista de la Sociedad Científica del Paraguay     Open Access   (Followers: 7)
RAC: Revista Angolana de Ciências     Open Access   (Followers: 7)
Research     Open Access   (Followers: 6)
The Innovation     Open Access   (Followers: 6)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Frontiers in Climate     Open Access   (Followers: 5)
Discover Sustainability     Open Access   (Followers: 5)
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
International Journal of Culture and Modernity     Open Access   (Followers: 5)
History of Science and Technology     Open Access   (Followers: 5)
Data     Open Access   (Followers: 4)
Science & Technology Studies     Open Access   (Followers: 4)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of Big History     Open Access   (Followers: 4)
MUST : Journal of Mathematics Education, Science and Technology     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
People and Nature     Open Access   (Followers: 4)
Middle European Scientific Bulletin     Open Access   (Followers: 4)
Citizen Science : Theory and Practice     Open Access   (Followers: 3)
Research Policy : X     Open Access   (Followers: 3)
Revista Saber Digital     Open Access   (Followers: 3)
iScience     Open Access   (Followers: 2)
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Acta Nova     Open Access   (Followers: 2)
Indonesian Journal of Science and Mathematics Education     Open Access   (Followers: 2)
Rekayasa     Open Access   (Followers: 2)
Indian Journal of History of Science     Hybrid Journal   (Followers: 2)
Jaunujų mokslininkų darbai     Open Access   (Followers: 2)
Journal of Alasmarya University     Open Access   (Followers: 2)
BJHS Themes     Open Access   (Followers: 2)
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Revista Científica de la Universidad Nacional del Este     Open Access   (Followers: 2)
Scientific Bulletin     Open Access   (Followers: 1)
Global Journal of Science Frontier Research     Open Access   (Followers: 1)
Impact     Open Access   (Followers: 1)
International Journal of Research in Science     Open Access   (Followers: 1)
Journal of Science and Technology     Open Access   (Followers: 1)
Uluslararası Bilimsel Araştırmalar Dergisi (IBAD)     Open Access   (Followers: 1)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Scientonomy : Journal for the Science of Science     Open Access   (Followers: 1)
Revista Vivências em Ensino de Ciências     Open Access   (Followers: 1)
PENDIPA : Journal of Science Education     Open Access   (Followers: 1)
Journal of Science and Engineering     Open Access   (Followers: 1)
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
Futures & Foresight Science     Hybrid Journal   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
AAS Open Research     Open Access   (Followers: 1)
ARPHA Conference Abstracts     Open Access   (Followers: 1)
Rihan Journal for Scientific Publishing     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 1)
Natural Sciences Education     Hybrid Journal   (Followers: 1)
South American Sciences     Open Access   (Followers: 1)
International Science and Technology Journal of Namibia     Open Access   (Followers: 1)
Fundamental Research     Open Access  
Research Integrity and Peer Review     Open Access  
Journal of Responsible Technology     Open Access  
Natural Sciences     Open Access  
Türk Bilim ve Mühendislik Dergisi     Open Access  
ArtefaCToS : Revista de estudios sobre la ciencia y la tecnología     Open Access  
Ethiopian Journal of Sciences and Sustainable Development     Open Access  
Vilnius University Proceedings     Open Access  
Sciential     Open Access  
ARPHA Proceedings     Open Access  
Gaudium Sciendi     Open Access  
Crea Ciencia Revista Científica     Open Access  
Rafidain Journal of Science     Open Access  
Journal of Al-Qadisiyah for Pure Science     Open Access  
Revista Tecnológica     Open Access  
Himalayan Journal of Science and Technology     Open Access  
International Journal of Academic Research in Business, Arts & Science     Open Access  
Universidad, Ciencia y Tecnología     Open Access  
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Revista Politécnica     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Jurnal Ilmiah Ilmu Terapan Universitas Jambi : JIITUJ     Open Access  
Revista Eletrônica Ludus Scientiae     Open Access  
Emergent Scientist     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Archives of Current Research International     Open Access  
Advances in Research     Open Access  
International Journal of Applied Science     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
J : Multidisciplinary Scientific Journal     Open Access  
Revista Binacional Brasil - Argentina: Diálogo entre as ciências     Open Access  
Revista Ciencia y Tecnología     Open Access  
Journal of Institute of Science and Technology     Open Access  
Journal of Science (JSc)     Open Access  
WikiJournal of Science     Open Access  
Acta Materialia Transilvanica     Open Access  
Integrated Research Advances     Open Access  
Open Conference Proceedings Journal     Open Access  
Naturen     Full-text available via subscription  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Sci     Open Access  
Maskana     Open Access  
Hoosier Science Teacher     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Facets     Open Access  
Adıyaman University Journal of Science     Open Access  
Revista Brasileira de Iniciação Científica     Open Access  
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Scientific African     Open Access  
Scientific Journal of Mehmet Akif Ersoy University     Open Access  
Black Sea Journal of Engineering and Science     Open Access  
Fırat University Turkish Journal of Science & Technology     Open Access  
Gazi University Journal of Science     Open Access  
Middle East Journal of Science     Open Access  
International Journal of Computational and Experimental Science and Engineering (IJCESEN)     Open Access  
International Journal of Engineering, Technology and Natural Sciences     Open Access  
Bulletin of the National Research Centre     Open Access  
Uni-pluriversidad     Open Access  
ConCiencia     Open Access  
Ciencia y Tecnología     Open Access  
Revista Bases de la Ciencia     Open Access  
Elkawnie : Journal of Islamic Science and Technology     Open Access  
Ciência ET Praxis     Open Access  
Arab Journal of Basic and Applied Sciences     Open Access  
International Annals of Science     Open Access  
Science Heritage Journal     Open Access  
Bilge International Journal of Science and Technology Research     Open Access  
Avrasya Terim Dergisi     Open Access  
International Scientific and Vocational Studies Journal     Open Access  
TÜBAV Bilim Dergisi     Open Access  
LOGIKA Jurnal Ilmiah Lemlit Unswagati Cirebon     Open Access  
Dalat University Journal of Science     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Respuestas     Open Access  
Science Diliman     Open Access  
Instruments     Open Access  
Revista Científica y Tecnológica UPSE     Open Access  
HardwareX     Open Access  
Sultan Qaboos University Journal for Science     Open Access  
Borneo Journal of Resource Science and Technology     Open Access  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Revista de Información Científica     Open Access  
Indonesian Journal of Fundamental Sciences     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Jurnal Natural     Open Access  
Frontiers for Young Minds     Open Access  
Revista Ciência, Tecnologia & Ambiente     Open Access  
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Negative and No Positive Results     Open Access  
Revista Conhecimento Online     Open Access  
Nova     Open Access  
CienciaUAT     Open Access  
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Makara Journal of Science     Open Access  
Jurnal Sains Dasar     Open Access  
Indonesian Journal of Science and Technology     Open Access  
Ethiopian Journal of Science and Technology     Open Access  
Jurnal Matematika, Sains, Dan Teknologi     Open Access  
Heidelberger Jahrbücher Online     Open Access  
ARO. The Scientific Journal of Koya University     Open Access  
International Journal of Recent Contributions from Engineering, Science & IT     Open Access  
Estação Científica (UNIFAP)     Open Access  
The Winnower     Open Access  

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JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


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