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Articles de revues sur le sujet « Dipentene »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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1

Nikolaev, Artem N., Svetlana N. Skomorokhova, Elena M. Trifanova et Alexander V. Kutchin. « INVESTIGATION OF DIPENTENE ISOLATION POSSIBILITY FROM TIRES PYROLYSIS OIL IN LEAD MELT ». IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no 2 (8 février 2019) : 85–93. http://dx.doi.org/10.6060/ivkkt.20196202.5931.

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The work is aimed at experimental substantiation of dipentene (dl-limonene) extraction from pyrolysis liquid obtained by pyrolysis in the lead melt of tires of different brands. Pyrolysis liquid was isolated under conditions that reduce the sulfur content and increase the proportion of dipentene in the direct-contact reactor in the lead melt and in the temperature range of 400-470 °C. A method for extracting dipentene from pyrolytic liquid by distillation at normal pressure, in vacuum, and two-stage distillation (first with water vapor, then vacuum distillation) to obtain fractions enriched with dipentene was tested. The results obtained demonstrate that at this stage of the study the chemically unstable fraction of polyene hydrocarbons in the pyrolysis liquid is actively polymerized during distillation. The chromatographic analysis of the initial samples and distillation fractions was carried out, which showed that the feedstock contains more than 100 chemicals with a dipentene content of not more than 17%. Based on the evaluation of the obtained quantitative characteristics, distillation parameters providing the maximum yield of dipentene were determined. Under the proposed conditions, the enrichment of individual fractions with dipentene by ~4-6 times compared to its initial content in pyrolysis liquid was achieved. During distillation in vacuum, a fraction with a yield of 19.6% with a content of dipentene up to 40.8% was isolated, a narrow fraction with an yield of 4.8% with a maximum content of dipentene of 49.9% was isolated. During distillation with steam and subsequent vacuum distillation with a total yield of 17%, fractions with a dipentene content of 24-36 % were isolated. Further concentration of dipentene will obviously require more complex chemical synthesis and fractionation operations. The data obtained may be of interest in the development of a new process of pyrolysis of tires in the melt of heavy metals (lead), improving its efficiency by identifying economically important components for the production of commercial products.
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Jung, Uiyeong, et Sung-Seen Choi. « Variation in Abundance Ratio of Isoprene and Dipentene Produced from Wear Particles Composed of Natural Rubber by Pyrolysis Depending on the Particle Size and Thermal Aging ». Polymers 15, no 4 (13 février 2023) : 929. http://dx.doi.org/10.3390/polym15040929.

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Tire wear particles (TWPs) are generated by friction between the road and the tire. TWPs are one of the major microplastics found in environmental samples, such as road dust, particulate matter (PM), and sediment. TWP contents in environmental samples are generally analyzed using the pyrolysis technique. Tire tread compounds of heavy vehicles are usually composed of natural rubber (NR). Isoprene and dipentene are the principal pyrolysis products of NR, and dipentene is employed as the key marker for the determination of the TWP contents. In this study, an NR abrasion specimen was thermally aged, and an abrasion test was performed to obtain the wear particles. The influence of the wear particle size and thermal aging on the pyrolysis behavior of NR was investigated. The isoprene/dipentene ratio exponentially increased as the wear particle size decreased, and it was also increased by the thermal aging of the abrasion specimen. The increased isoprene/dipentene ratio by thermal aging was explained by increasing the crosslink density. Using the relationship between the wear particle size and the isoprene/dipentene ratio, it is possible to estimate the isoprene/dipentene ratio for very small TWP such as PM. The experimental results concluded that the wear particle size and thermal aging affect the formation of the key pyrogenic products, and the influencing factors should be considered for the quantification of TWP contents in the environmental samples.
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Dai, Chuan Bo, Gao Feng Pan, Rui Duan Li et Hua Wang. « The Study on Dipentene Hydrogenation Catalyst ». Advanced Materials Research 550-553 (juillet 2012) : 371–74. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.371.

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In this paper, we prepared Dipentene Hydrogenation Catalyst by impregnating, with activated alumina as catalyst carrier and nickel nitrate solution as soaking liquid. The objective of this study was to investigate the influences of the amount of nickel loading, calcination temperature and hydrogen reduction temperature on catalyst activity. The results show that the optimum parameters are: 21% of nickel loading, the calcination temperature of 550-650 °C, the hydrogen reduction temperature of 325-350 °C. The purity of p-menthane prepared under the conditions was more than 97 %, reaching special class standards.
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Martins, César, Margarida Gonçalo et Saudade Gonçalo. « Allergic contact dermatitis from dipentene in wax polish ». Contact Dermatitis 33, no 2 (août 1995) : 126–27. http://dx.doi.org/10.1111/j.1600-0536.1995.tb00516.x.

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Westaway, H., et J. F. Williams. « Composition of the dipentene fraction of C10H16 terpenes ». Journal of Applied Chemistry 9, no 8 (4 mai 2007) : 440–44. http://dx.doi.org/10.1002/jctb.5010090811.

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Mun, Sunhee, Hwansoo Chong, Jongtae Lee et Yunsung Lim. « Characteristics of Real-World Non-Exhaust Particulates from Vehicles ». Energies 16, no 1 (23 décembre 2022) : 177. http://dx.doi.org/10.3390/en16010177.

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The need to regulate the non-exhaust particulate matter (PM) emissions from vehicles has been discussed worldwide due to the bad environmental impact and the toxicity to the human body. In-depth studies have been precisely conducted on the analysis of the non-exhaust particulate matters, in particular, the amount of tire, brake and road wear particles and their proportion in the atmosphere. In this study, the influence of tire and road wear particles (TRWP) on PM in the atmosphere was investigated with tire and PM samples. The PM samples suspended in the atmosphere were collected with a high-volume sampler equipped with a quartz filter. Additionally, polycyclic aromatic hydrocarbons (PAHs) and metal components in tire rubber were analyzed as markers by pyrolysis–gas chromatography/mass spectrometry (pyrolysis–GC/MS), GC/MS, and inductively coupled plasma/mass spectrometry (ICP/MS). More vinylcyclohexene was detected than dipentene in the markers measured in the samples of tires equipped with vehicles driving on the road, while more dipentene was measured in total suspended particles (TSP) samples. Among the PAHs in tire samples, pyrene exhibited the highest concentration. Benzo(b)fluoranthene showed the highest concentration in the TSP samples. Among the metals, the highest concentration was zinc in all tire samples and calcium in TSP samples.
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Danon, B., P. van der Gryp, C. E. Schwarz et J. F. Görgens. « A review of dipentene (dl-limonene) production from waste tire pyrolysis ». Journal of Analytical and Applied Pyrolysis 112 (mars 2015) : 1–13. http://dx.doi.org/10.1016/j.jaap.2014.12.025.

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Hwang, Hann-Jang, Chun-Hung Li et Chun-Shan Wang. « Synthesis and properties of bismaleimide resin containing dicyclopentadiene or dipentene. VI ». Polymer International 55, no 11 (2006) : 1341–49. http://dx.doi.org/10.1002/pi.2092.

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Rhodes, Christopher J. « Radiolabelling Measurements of Radicals Derived from Terpenoid Volatile Organic Conpounds (VOCs) Adsorbed in Porous Carbon ». Progress in Reaction Kinetics and Mechanism 31, no 3 (avril 2006) : 159–88. http://dx.doi.org/10.3184/146867806x197113.

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Radiolabelled free radicals were formed by the addition of muonium-a radioactive hydrogen atom with a positive muon as its nucleus-to α-pinene, β-pinene, dihydrocarvone, dihydrocarveol and dipentene, each as adsorbed in porous carbon. The radicals were identified using transverse-field muon spin rotation (TF-MuSR) and the activation parameters associated with their reorientational motion were measured using longitudinal-field muon spin relaxation (LF-MuSRx). Two distinct adsorbed fractions were detected in each sample, characterised by activation energies in the range 2-6 kJ/mol and 12-16 J/mol respectively.
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Bai, Tao, Fan Wu, Yunfei Zhang, Chunguang Mao, Gang Wang, Yanguang Wu, Hua Bai et Yuanyuan Li. « Sulfur modification with dipentene and ethylhexyl acrylate to enhance asphalt mixture performance ». Construction and Building Materials 343 (août 2022) : 128086. http://dx.doi.org/10.1016/j.conbuildmat.2022.128086.

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Zhang, Qiu-ge, Liang-wu Bi, Zhen-dong Zhao, Yuan-ping Chen, Dong-mei Li, Yan Gu, Jing Wang, Yu-xiang Chen, Cai-ying Bo et Xian-zhang Liu. « Application of ultrasonic spraying in preparation of p-cymene by industrial dipentene dehydrogenation ». Chemical Engineering Journal 159, no 1-3 (1 mai 2010) : 190–94. http://dx.doi.org/10.1016/j.cej.2010.02.052.

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Bi, Liang Wu, Qiu Ge Zhang, Peng Wang, Zhen Dong Zhao, Da Wei Li, Yu Xiang Chen, Dong Mei Li, Yan Gu, Jing Wang et Xian Zhang Liu. « Study on Gas-Phase Catalytic Conversion of Turpentine-Based Dipentene (TBDP) by Pd/C Catalysts ». Advanced Materials Research 236-238 (mai 2011) : 27–34. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.27.

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Turpentine-based dipentene (TBDP) contains limonene 30.32 %, terpinolene 31.35 %,α-terpinene 7.55 %,γ-terpinene 6.40 % andp-cymene 12.87 %. Three Pd/C catalysts were characterized by BET, XRD, TG-DTG and atomic absorption spectrometry (AAS). The properties of the catalysts on TBDP conversion were compared. Difference of catalytic competitive reactions of TBDP by catalyst A with the change of reaction temperature was discussed in detail. The yield ofp-cymene at 280-310°C was over 95.0 %. It was important to control the reaction temperature for TBDP dehydrogenation catalyzed by Pd/C catalysts. It is valuable to probe the catalytic behaviors of Pd/C catalyst on TBDP dehydrogenation for research and development of efficient preparation technology ofp-cymene from TBDP.
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Schwartz, S. M., R. S. Boethling et T. Leighton. « Fate of the terpenes anethole and dipentene in a bench-scale activated sludge system ». Chemosphere 21, no 10-11 (janvier 1990) : 1153–60. http://dx.doi.org/10.1016/0045-6535(90)90136-h.

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D'Erme, Angelo Massimiliano, Stefano Francalanci, Nicola Milanesi, Luca Ricci et Massimo Gola. « Contact dermatitis due to dipentene and pine oil in an automobile mechanic : Figure 1 ». Occupational and Environmental Medicine 69, no 6 (6 décembre 2011) : 452.1–452. http://dx.doi.org/10.1136/oemed-2011-100446.

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Lin, Ching Hsuan, Zheng Rong Jiang et Chun Shan Wang. « Low dielectric thermoset. II. Synthesis and properties of novel 2,6-dimethyl phenol-dipentene epoxy ». Journal of Polymer Science Part A : Polymer Chemistry 40, no 22 (8 octobre 2002) : 4084–97. http://dx.doi.org/10.1002/pola.10488.

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Naveed, Rasheeha, Abu Baker Siddique, Iftikhar Hussain, Mazhar Ulhaq, Bilal Aslam et Muhammad Shahid Mahmood. « Antimicrobial activity of bioactive components of essential oils from Citrus sinensis against important pathogens ». International Food Research Journal 28, no 1 (1 février 2021) : 189–98. http://dx.doi.org/10.47836/ifrj.28.1.19.

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Alternative strategies to treat multidrug resistant pathogens are indispensable due to the scarcity of new therapeutically effective antibiotics. The present work was conducted to investigate the antimicrobial effects of essential oils extracted from Citrus sinensis, locally known as “Mousami”, against various important pathogens as well as their phytochemical characterisation. Essential oils were extracted from Cit. sinensis peels by the steam distillation method, and a 0.23% yield was obtained. Chemical composition of the extracted essential oil was analysed through gas chromatography/mass spectrometry (GC/MS). The analysis revealed that the Cit. sinensis essential oil was composed of a variety of chemical compounds; mostly are monoterpene hydrocarbon and 0.62% of limonene (dipentene), as well as oxygenated monoterpenes and 0.50% limonene oxide, also known as eucalyptol. Standard reference microorganisms, i.e., E. coli (ATCC 25922), Staphylococcus aureus (ATCC 25923), Salmonella Typhi (ATCC 24682), Bacillus subtilis (ATCC 6633), Aspergillus flavus (ATCC 204304), and Candida albicans (ATCC 10231) were used, and the in vitro antimicrobial effect of Cit. sinensis essential oils was observed against these strains by disc diffusion method. Statistical analysis of the resulting data was done by using Least Significant Difference (LSD) method and Analysis of Variance (ANOVA) to assess the significant association between biological activities of essential oils at p < 0.05. Using microbroth dilution assay, maximum sensitivity was exhibited by E. coli and Can. albicans among the tested microbial strains. The zones of inhibition were significantly different, having diameters of 34.0 ± 1.5 and 55.0 ± 0.5 mm for the said bacterial and fungal strains, respectively; and their MIC values were 0.0007 ± 0.0001 and 0.0007 ± 0.0006 mg/ml, respectively. Thin layer chromatography-bioautography (TLC-bioautography) showed dipentene as biologically most active antimicrobial component. Hence, it was established that broad spectrum antimicrobial effect against important microorganisms was elucidated by essential oil extracts from Cit. sinensis that may be used as a natural antimicrobial to treat various infections caused by pathogens of public health interest.
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Hardoko, Hardoko, et Syahrani Nurul Mutmainannah. « The Potency of Water Clover (<I>Marsilea crenata</I> ; C. Presl.) Leaves as Anticholesterolemic Functional Foods Through <I>In Silico</I> ; Study ». Jurnal Ilmiah Perikanan dan Kelautan 15, no 1 (27 janvier 2023) : 131–41. http://dx.doi.org/10.20473/jipk.v15i1.35338.

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Highlight Research 1. There were 26 active compounds from water clover leaf extract that were identified using GC-MS 2. In silico approach was used to screen potential anticholesterolemic compounds from water clover leaf extract 3. Anticholesterolemic compounds from water clover leaf extract were interacted with HMG-CoA reductase receptors and compared to native ligand and medicine 4. There were 6 potential anticholesterolemic compounds identified from water clover leaf extract Abstract Water clover (Marsilea crenata C. Presl.) is a widely available plant in Indonesia and often utilized as a traditional food ingredient. This plant is also traditionally believed to contain compounds that can decrease blood cholesterol. This study aimed to determine the compounds in water clover which have the potential to decrease blood cholesterol through inhibition of the HMG-CoA enzyme using in silico approach. This research was done in several steps, i.e., extraction using ethyl acetate solvent, identification of chemical compounds using GC-MS, and screening of compounds with potential to be anticholesterolemic agent through in silico using PyRx 0.8 (AutoDockVina and Open Babel GUI version 2.4.1), Discovery Studio Visualizer 2021, and PyMOL™ 1.7.4.5 software. Results showed that ethyl acetate extract of water clover contained 26 compounds, 6 of which were potential to be anticholesterolemic agent, i.e., phytol, 1,2-benzenedicarboxylic acid, 2,4-di- tert-butylphenol, diethyl phthalate, 1,2,3,4-tetramethylbenzene, and dipentene. Binding affinity values of those six compounds were lower than the native ligand of the HMG-CoA reductase, although still higher compared to pravastatin. The binding affinity value of pravastatin was -7.13 kcal/mol and the binding affinity value of 3-methyl glutaric acid as a native ligand was -5.33 kcal/mol, meanwhile, the lowest binding affinity value of compounds in water clover was phytol (-6.37 kcal/mol) and the highest was dipentene (-5.40 kcal/mol). Through in silico study, there were six compounds from water clover leaf’s ethyl acetate extract that could inhibit the HMG-CoA reductase. Therefore, water clover leaf has the potential to become an anticholesterolemic functional food ingredient.
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Soares, Andreia, et Miguel Pestana. « Polyterpene Resisns : Part I – A Brief Historical Review ». Silva Lusitana 28, no 2 (2020) : 181–95. http://dx.doi.org/10.1051/silu/20202802165.

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The terpenic resins are polymers of low molecular weight hydrocarbons, obtained by cationic polymerization of terpenes. These products are used in the adhesives, sealants and wax coating industries. Commercial adhesive resins are prepared from monoterpenes -the main ones are α-pinene, β-pinene and dipentene. The softening point and molecular weight of polyterpene resins are critical for their main use (adherence). Its adhesive behavior results from the relationship of the softening point with the molecular weight. At the commercial level, polyterpene resins are produced by polymerization of terpene monomers. Batch and continuous systems are used. The composition of an adhesive requires a wide knowledge of the materials available and the specific requirements of its application. The most common types of adhesives are Pressure Sensitive Adhesives, Hot-melt Adhesives and Structural Adhesives.
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VOLCHO, K. P., D. V. KORCHAGINA, L. E. TATAROVA, N. F. SALAKHUTDINOV et V. A. BARKHASH. « ChemInform Abstract : Unexpected Cycloaddition Reaction of Aldehydes to Myrcene and Dipentene on Askanite-Bentonite Clay. » ChemInform 25, no 17 (19 août 2010) : no. http://dx.doi.org/10.1002/chin.199417223.

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Du, Junming, Hualong Xu, Jiang Shen, Jingjing Huang, Wei Shen et Dongyuan Zhao. « Catalytic dehydrogenation and cracking of industrial dipentene over M/SBA-15 (M=Al, Zn) catalysts ». Applied Catalysis A : General 296, no 2 (décembre 2005) : 186–93. http://dx.doi.org/10.1016/j.apcata.2005.08.030.

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Xin, Junna, Pei Zhang, Kun Huang et Jinwen Zhang. « Study of green epoxy resins derived from renewable cinnamic acid and dipentene : synthesis, curing and properties ». RSC Advances 4, no 17 (2014) : 8525. http://dx.doi.org/10.1039/c3ra47927g.

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Chae, Eunji, et Sung-Seen Choi. « Analysis of Polymeric Components in Particulate Matter Using Pyrolysis-Gas Chromatography/Mass Spectrometry ». Polymers 14, no 15 (31 juillet 2022) : 3122. http://dx.doi.org/10.3390/polym14153122.

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Particulate matters (PMs) such as PM10 and PM2.5 were collected at a bus stop and were analyzed using pyrolysis-gas chromatography/mass spectrometry to identify organic polymeric materials in them. The major pyrolysis products of the PM samples were isoprene, toluene, styrene, dipentene, and 1-alkenes. The pyrolysis products generated from the PM samples were identified using reference polymeric samples such as common rubbers (natural rubber, butadiene rubber, and styrene-butadiene rubber), common plastics (polyethylene, polypropylene, polystyrene, and poly(ethylene terephthalate)), plant-related components (bark, wood, and leaf), and bitumen. The major sources of the principal polymeric materials in the PM samples were found to be the abrasion of the tire tread and asphalt pavement, plant-related components, and lint from polyester fabric. The particles produced by the abrasion of the tire tread and asphalt pavement on the road were non-exhaustive sources, while the plant-related components and lint from polyester fabric were inflowed from the outside.
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Huang, Yingying, Jiezhen Liang, Linlin Wang, Wei Li et Xiaopeng Chen. « Vapor–Liquid Equilibria for Binary and Ternary Systems with β-Caryophyllene, Dipentene, and α-Pinene at 100.7 kPa ». Journal of Chemical & ; Engineering Data 65, no 8 (2 juillet 2020) : 3770–77. http://dx.doi.org/10.1021/acs.jced.9b01049.

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VOLCHO, K. P., D. V. KORCHAGINA, N. F. SALAKHUTDINOV et V. A. BARKHASH. « ChemInform Abstract : Unusual Reaction of Styrene (I) with Dipentene (II) and γ- Terpinene (VI) on Askanite-Bentonite Clay ». ChemInform 26, no 34 (17 août 2010) : no. http://dx.doi.org/10.1002/chin.199534202.

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Reyes-Gracia, A., Jose Alberto Alvarado, R. Pérez-Cuapio et H. Juárez. « Comparison from lemon juice and N-dipentene ZnO nanoparticles green synthesis : Influence of byproducts in morphology and size ». Materials Science and Engineering : B 290 (avril 2023) : 116335. http://dx.doi.org/10.1016/j.mseb.2023.116335.

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Mao, Wei, Shouhai Li, Mei Li, Kun Huang et Jianling Xia. « Design, preparation and properties of novel flame retardant thermosetting vinyl ester copolymers based on castor oil and industrial dipentene ». Polish Journal of Chemical Technology 19, no 3 (1 septembre 2017) : 1–8. http://dx.doi.org/10.1515/pjct-2017-0040.

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Abstract A novel bio-based flame-retardant thermosetting vinyl ester resin monomer was synthesized from castor oil. The chemical structures of the monomer was characterized by FTIR and 1H-NMR. In order to improve its rigidity and expand its application in the field of bio-based materials, it was mixed with certain proportions of another reactive bio-based VER monomer, which had rigid and strong polar groups, and then a series of copolymers were prepared with thermal curing method. Then their tensile property, hardness, morphology of fractured surface, flame retardant property, DMA and thermostability were all investigated. The results indicated that the copolymers had relatively high tensile strength of 11.2 MPa, and the limiting oxygen index is above 23% in all prepared copolymers. DMA demonstrates that the glass transition temperature of the cured resins is up to 56.1°C. Thermogravimetric analysis shows that the copolymers have excellent thermal stability.
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Li, Mei, Jinwen Zhang, Kun Huang, Shouhai Li, Jianchun Jiang et Jianling Xia. « Mixed calcium and zinc salts of dicarboxylic acids derived from rosin and dipentene : preparation and thermal stabilization for PVC ». RSC Adv. 4, no 108 (19 novembre 2014) : 63576–85. http://dx.doi.org/10.1039/c4ra10657a.

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Lesage, P., J. P. Candy, C. Hirigoyen, F. Humblot et J. M. Basset. « Selective dehydrogenation of dipentene (R-(+)-limonene) into paracymene on silica supported palladium assisted by α-olefins as hydrogen acceptor ». Journal of Molecular Catalysis A : Chemical 112, no 3 (novembre 1996) : 431–35. http://dx.doi.org/10.1016/1381-1169(96)00220-8.

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Hwang, Hann-Jang, Jeng-Yueh Shieh, Chun-Hung Li et Chun-Shan Wang. « Dielectric and thermal properties of polymer network based on bismaleimide resin and cyanate ester containing dicyclopentadiene or dipentene. III ». Journal of Applied Polymer Science 103, no 3 (2006) : 1942–51. http://dx.doi.org/10.1002/app.24951.

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Lin, Ching Hsuan, Chu Nan Hsiao, Chun Hung Li et Chun Shan Wang. « Low dielectric thermoset. IV. Synthesis and properties of a dipentene-containing cyanate ester and its copolymerization with bisphenol A dicyanate ester ». Journal of Polymer Science Part A : Polymer Chemistry 42, no 16 (2004) : 3986–95. http://dx.doi.org/10.1002/pola.20226.

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Biu, Onyinebifun Emmanuel, Maureen Tobechukwu Nwakuya et Gamage Tubona. « Assessment of Asymptotic and Logistics Growth Models on A Chemist Data ». European Journal of Mathematics and Statistics 3, no 5 (5 septembre 2022) : 7–15. http://dx.doi.org/10.24018/ejmath.2022.3.5.132.

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This research considers two growth models; asymptotic growth model and logistic growth model. Both models were compared to establish a better model for modelling and prediction based on a Chemist data on the percentage concentration of isomers versus time for each Isomerization of α-Pinene at 189.50C. Results from the growth curve shows a non-linear relationship between the response (time of isomerization) and the independent variables (percentage of concentration) for all the four isomers considered. Based on the four isomers four different quadratic regressions of second-order were fitted. The problem of the initial parameters was addressed by second-order regression techniques since the models considered have three parameters to be estimated before the iterative approach was used. Estimation of parameters was done using modified version of the Levenberg-Marquardt Algorithm in Gretl statistical software. The results from both models were compared based on Aikaike Information Criteri (AIC), Bayesian Information Criteria (BIC), Mean Squared Error (MSE) and R-square. The Asymptotic Growth Model was identified to be a more adequate model for modelling and predicting growth patterns for three isomers (Dipentene, Pyronene and Dimer) while logistic growth model was seen to be a better model for predicting growth patterns of one isomer (Allo-Ocimene). This study will go a long way in directing Chemists and researchers in that field in choosing the appropriate model for their research.
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Suwannayod, Suttida, Kabkaew L. Sukontason, Benjawan Pitasawat, Anuluck Junkum, Kwankamol Limsopatham, Malcolm K. Jones, Pradya Somboon et al. « Synergistic Toxicity of Plant Essential Oils Combined with Pyrethroid Insecticides against Blow Flies and the House Fly ». Insects 10, no 6 (21 juin 2019) : 178. http://dx.doi.org/10.3390/insects10060178.

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Blow flies (Diptera: Calliphoridae) and the house fly (Diptera: Muscidae) are filth flies of medical importance, and control of their population is needed. As insecticide applications have resulted in fly resistance, and the exploration of plant essential oils (EOs) has increased against filth flies, this study assessed the combination of EOs with pyrethoids to enhance toxic efficacy. The EOs of five effective plants were screened initially against the house fly (Musca domestica L.). Their chemical constituent was performed using gas chromatography-mass spectrometry (GC-MS) analysis. The main components of Boesenbergia rotunda (Zingiberaceae) rhizome, Curcuma longa (Zingiberaceae) rhizome, Citrus hystrix (Rutaceae) fruit peel, Ocimum gratissimum (Lamiaceae) seed, and Zanthoxylum limonella (Rutaceae) fruit were δ-3-caren (35.25%), β-turmerone (51.68%), β-pinene (26.56%), p-cumic aldehyde (58.21%), and dipentene (60.22%), respectively. The screening test revealed that the three most effective plant EOs were from B. rotunda, C. longa and O. gratissimum, which were selected for the combination with two pyrethroid insecticides (permethrin and deltamethrin), in order to enhance their synergistic efficacy against the blow flies, Chrysomya megacephala Fabricius, Chrysomya rufifacies Macquart, and Lucilia cuprina Wiedemann, and the house fly. Synergistic action was presented in almost all of the flies tested with permenthrin/deltamethrin/EOs mixtures. It was interesting that the combination of deltamethrin with three EOs showed a synergistic effect on all of the tested flies. However, an antagonistic effect was observed in C. megacephala and M. domestica treated with permethrin-B. rotunda and C. megacephala treated with permethrin-O. gratissimum. The LD50 of insecticides decreased when combined with plant EOs. This alternative strategy will be helpful in developing a formula for effective fly control management.
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Prasetiyo, Febri Bayu, Ridwan Yusuf et M. Adie Syaputra. « RANCANG BANGUN APLIKASI PENGENALAN HURUF UNTUK ANAK USIA DINI BERBASIS ANDROID ». Journal Computer Science and Informatic Systems : J-Cosys 1, no 1 (4 mars 2021) : 18–31. http://dx.doi.org/10.53514/jc.v1i1.36.

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Pendidikan anak usia dini adalah suatu upaya pembinaan yang di tujukan kepada anaksejak lahir sampai dengan usia enam tahun. Program pendidikan anak usia dini harussesuaikan dengan kebutuhan minat dan perkembangan anak. Dalam era sekarang ini anak-anakusia dini sudah mulai belajar mengeja dan membaca. Hal ini sangat dipenting karena merupakan dasar kita untuk mengetahui suatu informasi. Namun, pada umumnya aplikpengenalan huruf hanya menggunakan gambar dan teks. Dengan fasilitas android diharapkanak-anak dapat menangkap isi dari aplikasi yang dibangun. Dalam era sekarang ini anak-anak usia dini sudah mulai belajar mengeja dan membacHal ini sangat dipenting karena itu merupakan dasar kita untuk mengetahui suatu informasNamun, pada umumnya aplikasi pengenalan huruf hanya menggunakan gambar dan tekDengan fasilitas android diharapkan anak-anak dapat menangkap isi dari aplikasi ydibangun.
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Berg, Otto, Eric L. Chronister, Tomihiro Yamashita, Gary W. Scott, Robert M. Sweet et Joseph Calabrese. « s-Dipentacene : Structure, Spectroscopy, and Temperature- and Pressure-Dependent Photochemistry ». Journal of Physical Chemistry A 103, no 14 (avril 1999) : 2451–59. http://dx.doi.org/10.1021/jp984066g.

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Sibous, Lakhdar, Embarek Bentouhami et Mustayeen Ahmed Khan. « Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N2O2 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one ». Journal of Inorganic Chemistry 2013 (3 septembre 2013) : 1–11. http://dx.doi.org/10.1155/2013/104979.

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4,4′-Diaminobiphenyl reacts with 2,4-pentanedione in absolute ethanol in a molar ratio 1 : 2 to form mainly the product of [1 + 2] condensation, 4,4′-(biphenyl-4,4′-diyldinitrilo)dipentan-2-one (H2L). The Schiff base was used as tetradentate chelating ligand to coordinate CoII and NiII chlorides leading to complexes where the ratio of metal ligand was found to be 2 : 1 or 2 : 2. All the synthesized products were characterized by elemental analysis, infrared, electronic, and mass spectroscopy, 1H NMR, and DSC. The electrochemical behaviour of the ligand and its complexes in DMF is also investigated.
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KARIPCIN, FATMA, ISMAIL ÖZMEN et BURCIN CULU. « 4,4'-(DIPHENYLMETHANE-4,4'-DIYLDINITRILO)DIPENTAN-2-ONE AND 4,4'-(DIPHENYLETHER-4,4'-DIYLDINITRILO)DIPENTAN-2-ONE LIGANDS AND THEIR Ni(II), Cu(II) COMPLEXES : SYNTHESIS, CHARACTERIZATION, DNA CLEAVAGE STUDIES ». Journal of the Chilean Chemical Society 57, no 1 (mars 2012) : 1029–32. http://dx.doi.org/10.4067/s0717-97072012000100016.

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Zulfitria, Zulfitria, Happy Indira Dewi et Mutia Khanza. « PENERAPAN PEMBELAJARAN DONGENG DALAM MEMBENTUK KARAKTER SISWA ». Instruksional 2, no 1 (17 juin 2020) : 56. http://dx.doi.org/10.24853/instruksional.2.1.56-63.

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Dilatarbelakangi oleh era millenium sekarang ini, bahwa budaya mendongeng telah dianggap kuno dan mulai ditinggalkan. Dongeng merupakan cerita yang mengandung nilai-nilai moral dan sosial yang berguna untuk membentuk karakter anak. Strategi pembentukan karakter anak dilakukan dengan pemberian contoh, pembiasaan membaca dongeng, pembiasaan mendengarkan dongeng, dan penciptaan lingkungan baca yang mendukung. Tujuan penelitian ini adalah penerapan pembelajaran berbasis dongeng untuk pembentukan karakter siswa di era millennium secara maksimal, menyenangkan, dan terintegrasi dengan keluarga dan sekolah. Hasil penelitian bahwa penerapan pembelajaran dongeng sangat membantu guru dalam menyampaikan pesan untuk pembentukan karakter siswa yang lebih baik. Penelitian ini menggunakan penelitian kualitatif berupa pengamatan, wawancara dan dokumentasi. Kesimpulan dari penelitian ini adalah bahwa penerapan pembelajaran berbasis mendongeng sangat dipenting digunakan guru sehingga dapat membentuk karakter siswa. Pembentukan karakter anak dapat dilakukan di lingkungan pembelajaran sekolah dan lingkungan rumah atau keluarga.
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Lagerwall, D. R., J. C. Gallucci et L. A. Paquette. « Structure of diethyl 1,2,3,3b,4a,5,6,7,8,8a,8b,9-dodecahydro-1,5-dioxo-4,8,9-metheno-4H-cyclopenta[1,2-a:4,3-a']dipentalene-4,10-dicarboxylate ». Acta Crystallographica Section C Crystal Structure Communications 47, no 9 (15 septembre 1991) : 1868–72. http://dx.doi.org/10.1107/s0108270191000860.

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Shauib, Nadia M., Abdel-Zaher A. Elassar et Ali El-Dissouky. « Synthesis and spectroscopic characterization of copper(II) complexes with the polydentate chelating ligand 4,4′-[1,4-phenylenedi(nitrilo)dipente-2-one ». Spectrochimica Acta Part A : Molecular and Biomolecular Spectroscopy 63, no 3 (mars 2006) : 714–22. http://dx.doi.org/10.1016/j.saa.2005.06.024.

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Otsubo, Tetsuo, Yasuhiro Kono, Norio Hozo, Hisakazu Miyamoto, Yoshio Aso, Fumio Ogura, Takanori Tanaka et Masami Sawada. « Syntheses, Structures, and Properties of 2,3,6,7-Tetrathiabenzo[1,3-cd:4,6-c′d′]dipentalene and Its Methyl, Ethyl, Methylthio, and Ethylthio Derivatives : Novel Fused Polynuclear Heteroarenes ». Bulletin of the Chemical Society of Japan 66, no 7 (juillet 1993) : 2033–41. http://dx.doi.org/10.1246/bcsj.66.2033.

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GEVAZA, YU I., E. B. KORYAK, S. V. IKSANOVA et V. I. STANINETS. « ChemInform Abstract : Synthesis of N-Pentenyl-Substituted Monoaza-15-crowns-5 (III) and N,N′- Dipentenyl-Substituted Diaza-18-crowns-6 (VI) and Their Iodocyclization. » ChemInform 23, no 28 (21 août 2010) : no. http://dx.doi.org/10.1002/chin.199228199.

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LAGERWALL, D. R., J. C. GALLUCCI et L. A. PAQUETTE. « ChemInform Abstract : Structure of Diethyl 1,2,3,3b,4a,5,6,7,8,8a,8b,9-Dodecahydro-1,5-dioxo- 4,8,9-metheno-4H-cyclopenta(1,2-a:4,3-a′)dipentalene-4,10- dicarboxylate (I). » ChemInform 22, no 51 (22 août 2010) : no. http://dx.doi.org/10.1002/chin.199151042.

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OTSUBO, T., Y. KONO, N. HOZO, H. MIYAMOTO, Y. ASO, F. OGURA, T. TANAKA et M. SAWADA. « ChemInform Abstract : Syntheses, Structures, and Properties of 2,3,6,7-Tetrathiabenzo(1,3-cd : 4,6-c′d′)dipentalene and Its Methyl, Ethyl, Methylthio, and Ethylthio Derivatives : Novel Fused Polynuclear Heteroarenes. » ChemInform 24, no 46 (20 août 2010) : no. http://dx.doi.org/10.1002/chin.199346164.

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Silvano, Selena, Incoronata Tritto, Simona Losio et laura boggioni. « Sulfur-Dipentene polysulfides : from industrial waste to sustainable, low-cost materials ». Polymer Chemistry, 2022. http://dx.doi.org/10.1039/d2py00095d.

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M. Mahale, Bhupendra, Devendra S. Mahale et Azam Z. Shaikh. « Natural Herbs used in normal Cough and Cold Condition ». Research Journal of Pharmacognosy and Phytochemistry, 28 avril 2022, 98–102. http://dx.doi.org/10.52711/0975-4385.2022.00018.

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Natural herb Ajwain, Trachyspermum ammi (L.) Sprague is an annual herbaceous plant belonging to the highly valued medicinally important family, Apiaceae the essential oil from the fruits [7] are the phenols, mainly thymol and some carvacrol. The Indian Pharmacopoeia requires ajowan oil to contain not less than 40 per cent thymol. The remainder of the oil is called 'thymene'. Thymene, which constitutes c.45 per cent of the oil, has the following composition: p-cymene, 50-55; gterpinene, 30-35; a- and ß-pinenes, 4-5; and dipentene, 4-6%. Presence of minute 'amounts of camphene, myrcene and D3-carene is also reported. Kapoor is a tree of many faces as it is a giant, stately forest tree, native of the wet forests of tropical and subtropical regions of Asia. The species Camphora, refer to camphor, an important chemical constituent present in the oil found in the tissues of tree. The botanical name is derived from Greek language. It derived from the word 'kinnamomon' which means spice. This herb is recorded in Sanskrit also. This is also used by Egyptians as early 1485 BC for embalming purposes. Camphor tree is native to China, India, Mongolia, Japan and Taiwan and a variety of this fragrant evergreen tree is grown in Southern United States; especially in FloridaMenthol, Thymol, Phenol, Salicylic acid and Naphthol are amongst the fragrant chemical constituents obtained from this plant. Campher, Campherol, Cineol, Camphene, dipentene, terpineol, candinene, safrole, camphorace, laurolitsine, reticuline etc. Menthol is a naturally occurring monoterpene alcohol that is extracted from oil of peppermint, corn mint, or other mint plants. It is known for its minty, cooling odor, and taste , Various constituents of peppermint oil are limonene (1.0-5.0%), cineole (3.5-14.0%), menthone (14.0-32.0%), menthofuran (1.0-9.0%), isomenthone (1.510.0%), menthyl acetate (2.8-10.0%), isopulegol (0.2%), menthol (55.0%), pulegone (4.0%) and carvone (max. 1.0%). All three herbs gives relief from cough and cold, throat irritation and treating bronchitis.
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Mao, Wei, Shouhai Li, Mei Li, Xuejuan Yang, Jian Song, Mei Wang, Jianling Xia et Kun Huang. « A novel flame retardant UV-curable vinyl ester resin monomer based on industrial dipentene : Preparation, characterization, and properties ». Journal of Applied Polymer Science 133, no 41 (13 juillet 2016). http://dx.doi.org/10.1002/app.44084.

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Hong, Bo, Qing Chang, Yingyan Zhai, Bowen Ren et Feng Zhang. « Functional Characterization of Odorant Binding Protein PyasOBP2 From the Jujube Bud Weevil, Pachyrhinus yasumatsui (Coleoptera : Curculionidae) ». Frontiers in Physiology 13 (27 avril 2022). http://dx.doi.org/10.3389/fphys.2022.900752.

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Odorant binding proteins (OBPs) play an important role in insect olfaction. The jujube bud weevil Pachyrhinus yasumatsui (Coleoptera: Curculionidae) is a major pest of Zizyphus jujuba in northern China. In the present study, based on the antennal transcriptome, an OBP gene of P. yasumatsui (PyasOBP2) was cloned by reverse transcription PCR (RT-PCR). Expression profile analyses by quantitative real-time PCR (qRT-PCR) revealed that PyasOBP2 was highly expressed in the antennae of both male and female P. yasumatsui adults, while its expression was negligible in other tissues. PyasOBP2 was prokaryotically expressed, and purified by Ni-NTA resin. The fluorescence competitive binding assays with 38 plant volatiles from Z. jujuba showed that PyasOBP2 could bind with a broad range of plant volatiles, and had strongest binding capacities to host-plant volatiles like ethyl butyrate (Ki = 3.02 μM), 2-methyl-1-phenylpropene (Ki = 4.61 μM) and dipentene (Ki = 5.99 μM). The three dimensional structure of PyasOBP2 was predicted by homology modeling, and the crystal structure of AgamOBP1 (PDB ID: 2erb) was used as a template. The molecular docking results indicated that the amino acid residue Phe114 of PyasOBP2 could form hydrogen bonds or hydrophobic interactions with some specific ligands, so this residue might play a key role in perception of host plant volatiles. Our results provide a basis for further investigation of potential functions of PyasOBP2, and development of efficient monitoring and integrated pest management strategies of P. yasumatsui.
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Ursache, A. L., V. Mircean, M. Dumitrache, S. Andrei, L. Ştefănuţ, V. Cozma, R. Cătană et M. Cernea. « Is routine disinfection efficient in preventing contamination with Toxocara canis eggs ? » Journal of Helminthology 94 (12 juillet 2019). http://dx.doi.org/10.1017/s0022149x1900052x.

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Abstract Toxocara canis (Werner, 1782) is a zoonotic nematode commonly parasitizing dogs worldwide with great public health importance as the aetiological agent of human toxocariasis. In this respect, the aim of this study was to evaluate the effect of six disinfectant products commonly used in kennels, veterinary clinics and as household cleaning products on the embryogenesis and viability of T. canis eggs. The composition of active ingredients in these commercial disinfectants was sodium hypochlorite (A); a mix of N-(3-aminopropyl)-N-dodecylpropan-1.3-diamine and didecyldimethylammonium chloride (B); sodium dichloroisocyanurate dehydrate (C); a mix of glutaraldehyde, quaternary ammonium compounds, benzyl-c12-18-alkyldimethyl and chlorides (D); a mix of 2-propanol, ethanol, benzalkonium chloride and glucoprotamin (E); a mix of pentapotassium bis (peroxymonosulphate) bis (sulphate), sodium C10-13-alkylbenzenesulphonate, malic acid, sulphamidic acid, sodium toluenesulphonate, dipotassium peroxodisulphate and dipentene (F). After dilution, the tested disinfectants had the maximal concentration recommended by the manufacturer in order to achieve a biocidal effect. Each product was tested on approximately 10,000 T. canis eggs, having five different contact times (5, 10, 15, 30, 60 min). Three replicates were tested for each diluted disinfectant and for each contact time. After the treatment, eggs were washed and incubated in distilled water at 27 °C for 2 weeks. None of the tested products had a significant inhibitory effect on the embryogenesis and viability of T. canis eggs, regardless of the contact time. Moreover, after 2 weeks, in all tested samples, eggs containing motile infective larvae were identified, showing that routinely used disinfectants do not eliminate risk of infection by T. canis.
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Suwanti, Suwanti, et Yonferizal MR Koto. « Keputihan Pada Wanita Usia Subur Menggunakan Ekstrak Daun Sirsak ». Jurnal Kebidanan dan Kesehatan Tradisional 1, no 1 (7 mars 2016). http://dx.doi.org/10.37341/jkkt.v1i1.71.

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Abstract: The leaves of the soursop, woman of fertile age, Whitish. Whitish is the complaint most often found in women. Cause of vaginal discharge is a matter of cleanliness around the sex organs, such as less clean when dry the sex organs after urination and defecation. Soursop leaf oil contains asitrin, sineol 50% -65%, a- pinene, limonene and dipenten, mngandung asetogini compounds, among others asimisin, bulatasin and skuamosin. Peneitian goal is to determine the effectiveness of the use of soursop leaves against vaginal discharge in women of childbearing age. The research design was quasi experiment with pretest posttes approach, where the study was conducted grouping members of the experimental group. The subjects of this study were women of childbearing age who experience vaginal discharge by 30 samples. The statistical test used in this study is the Mann Whitney U Test. The results showed that women of childbearing age who experience vaginal discharge cured after taking the leaf extract of soursop 23 people (76.7%).
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