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Relevant bibliographies by topics / F3-layer

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Academic literature on the topic 'F3-layer'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "F3-layer"

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Sreeja, V., S. Ravindran, and T. K. Pant. "Features of the F3 layer occurrence over the equatorial location of Trivandrum." Annales Geophysicae 28, no. 9 (September 24, 2010): 1741–47. http://dx.doi.org/10.5194/angeo-28-1741-2010.

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Abstract. The general features of the F3 layer occurrence over the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip lat ~0.5° N) in India during the period from 1996–2005 are presented using the ionosonde observations. The study brings out that the F3 layer occurrence over Trivandrum is weak and rare compared to the other equatorial locations. The F3 layer occurrence is relatively more pronounced during the magnetically active conditions, thus indicating the dependence of the layer formation over Trivandrum on magnetic activity. It is also observed that the percentage occurrence of the F3 layer decreases with increasing solar activity.

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Jenkins, B., G. J. Bailey, M. A. Abdu, I. S. Batista, and N. Balan. "Observations and model calculations of an additional layer in the topside ionosphere above Fortaleza, Brazil." Annales Geophysicae 15, no. 6 (June 30, 1997): 753–59. http://dx.doi.org/10.1007/s00585-997-0753-3.

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Abstract. Calculations using the Sheffield University plasmasphere ionosphere model have shown that under certain conditions an additional layer can form in the low latitude topside ionosphere. This layer (the F3 layer) has subsequently been observed in ionograms recorded at Fortaleza in Brazil. It has not been observed in ionograms recorded at the neighbouring station São Luis. Model calculations have shown that the F3 layer is most likely to form in summer at Fortaleza due to a combination of the neutral wind and the E×B drift acting to raise the plasma. At the location of São Luis, almost on the geomagnetic equator, the neutral wind has a smaller vertical component so the F3 layer does not form.

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Batista, I. S., M. A. Abdu, A. M. da Silva, and J. R. Souza. "Ionospheric F3 layer: Implications for the IRI model." Advances in Space Research 31, no. 3 (January 2003): 607–11. http://dx.doi.org/10.1016/s0273-1177(03)00023-1.

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Depuev, V. H., and S. A. Pulinets. "Intercosmos-19 observations of an additional topside ionization layer: the F3 layer." Advances in Space Research 27, no. 6-7 (January 2001): 1289–92. http://dx.doi.org/10.1016/s0273-1177(01)00205-8.

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Vikhorev, Alexander V., Ksenia V. Strygina, and Elena K. Khlestkina. "Duplicated flavonoid 3’-hydroxylase and flavonoid 3’, 5’-hydroxylase genes in barley genome." PeerJ 7 (January 15, 2019): e6266. http://dx.doi.org/10.7717/peerj.6266.

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Background Anthocyanin compounds playing multiple biological functions can be synthesized in different parts of barley (Hordeum vulgare L.) plant. The diversity of anthocyanin molecules is related with branching the pathway to alternative ways in which dihydroflavonols may be modified either with the help of flavonoid 3′-hydroxylase (F3′H) or flavonoid 3′,5′-hydroxylase (F3′5′H)—the cytochrome P450-dependent monooxygenases. The F3′H and F3′5′H gene families are among the least studied anthocyanin biosynthesis structural genes in barley. The aim of this study was to identify and characterise duplicated copies of the F3′H and F3′5′H genes in the barley genome. Results Four copies of the F3′5′H gene (on chromosomes 4HL, 6HL, 6HS and 7HS) and two copies of the F3′H gene (on chromosomes 1HL and 6HS) were identified in barley genome. These copies have either one or two introns. Amino acid sequences analysis demonstrated the presence of the flavonoid hydroxylase-featured conserved motifs in all copies of the F3′H and F3′5′H genes with the exception of F3′5′H-3 carrying a loss-of-function mutation in a conservative cytochrome P450 domain. It was shown that the divergence between F3′H and F3′5′H genes occurred 129 million years ago (MYA) before the emergence of monocot and dicot plant species. The F3′H copy approximately occurred 80 MYA; the appearance of F3′5′H copies occurred 8, 36 and 91 MYA. qRT-PCR analysis revealed the tissue-specific activity for some copies of the studied genes. The F3′H-1 gene was transcribed in aleurone layer, lemma and pericarp (with an increased level in the coloured pericarp), whereas the F3′H-2 gene was expressed in stems only. The F3′5′H-1 gene was expressed only in the aleurone layer, and in a coloured aleurone its expression was 30-fold higher. The transcriptional activity of F3′5′H-2 was detected in different tissues with significantly higher level in uncoloured genotype in contrast to coloured ones. The F3′5′H-3 gene expressed neither in stems nor in aleurone layer, lemma and pericarp. The F3′5′H-4 gene copy was weakly expressed in all tissues analysed. Conclusion F3′H and F3′5′H-coding genes involved in anthocyanin synthesis in H. vulgare were identified and characterised, from which the copies designated F3′H-1, F3′H-2, F3′5′H-1 and F3′5′H-2 demonstrated tissue-specific expression patterns. Information on these modulators of the anthocyanin biosynthesis pathway can be used in future for manipulation with synthesis of diverse anthocyanin compounds in different parts of barley plant. Finding both the copies with tissue-specific expression and a copy undergoing pseudogenization demonstrated rapid evolutionary events tightly related with functional specialization of the duplicated members of the cytochrome P450-dependent monooxygenases gene families.

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Zain, A. F. M., S. Abdullah, M. J. Homam, F. C. Seman, M. Abdullah, and Y. H. Ho. "Observations of the F3-layer at equatorial region during 2005." Journal of Atmospheric and Solar-Terrestrial Physics 70, no. 6 (April 2008): 918–25. http://dx.doi.org/10.1016/j.jastp.2007.12.002.

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Handayani, Nestri, Subagus Wahyuono, Triana Hertiani, and Retno Murwanti. "Immunomodulatory activity and phytochemical content determination of fractions of suji leaves (Dracaena angustifolia (Medik.)Roxb.)." Food Research 4, no. 1 (August 9, 2019): 85–90. http://dx.doi.org/10.26656/fr.2017.4(1).228.

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Suji is a plant that has long been used as food colorant and medicinal plant in Indonesia. This study aimed to determine the immunomodulatory activity of fractions obtained from suji leaves by using in vitro phagocytic macrophage assay and also to determine the phytochemical compounds of the most active fraction. Initially, Suji dry leaves powder were macerated with 96% ethanol upon filtration, then the filtrate obtained was evaporated to dryness. The extract obtained was triturated with chloroform to give fraction soluble (F1) and insoluble fraction (F2). Then, F1 was partitioned using a mixture of hexane-methanol-water (25: 14: 1 v /v) to give two layers, namely upper layer (F3) and lower layer (F4). Furthermore, the four fractions (F1, F2, F3 and F4) were tested by in vitro phagocytic macrophages method at the concentration of 10, 25, 50 and 100 µg/mL. The parameters used were the Phagocytic Index (PI) and the Phagocytic Capacity (PC). Macrophage phagocytic in vitro assay showed that fractions of the suji leaf ethanolic extract could improve the phagocytic activity of macrophages. The fraction that demonstrated the highest activity was subjected to phytochemical study by Thin Layer Chromatography (TLC). Based on the data obtained, F3 was the most active fraction, because it has the highest PC and PI values compared to other fractions or negative control. TLC test revealed that F3 contained terpenoids and flavonoids.

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Antos, Piotr A., Anna Hrabia, Anna Gdula, and Andrzej Sechman. "Apoptosis in chicken ovarian follicles following in vitro exposure to TCDD, PCB 126 and PCB 153." Annals of Animal Science 17, no. 3 (July 26, 2017): 787–98. http://dx.doi.org/10.1515/aoas-2016-0087.

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Abstract The study was conducted in order to compare the in vitro effect of 2,3,7,8-tetrachlorodibenzo-pdioxin (TCDD), 3,3′,4,4′,5-pentachlorobiphenyl (PCB 126) and 2,2′,4,4′,5,5′-hexachlorobiphenyl (PCB 153) on the number of apoptotic cells and the activity of caspase-3 in chicken ovarian follicles. The ovarian stroma, white (WF) and yellowish (YF) prehierarchical follicles and fragments of the theca and granulosa layers of the 3 largest preovulatory follicles (F3-F1) were in vitro exposed to TCDD (10 nM), PCB 126 (10 nM) and PCB 153 (10 μM) for 24 h. After incubation the number of apoptotic cells and caspase-3 activity were determined by TUNEL method and fluorometric assay, respectively. PCB 126 and PCB 153 increased the number of apoptotic cells in the ovarian stroma while TCDD and PCB 126 elevated it in the WF follicles. Under the control conditions, caspase-3 activity steadily increased along with maturation of the follicles, reaching the highest level in the theca layer of the F1 follicle. The activity of this enzyme in the granulosa layer of F3-F1 follicles was on average 60% lower in comparison to the stroma. Exposure to TCDD elevated caspase-3 activity in prehierarchical follicles and in the granulosa layer of F2 and F1 preovulatory follicles. On the contrary, PCB 126 exerted a suppressive effect on caspase-3 activity in the WF follicles and the granulosa layer of the F2 follicle, and PCB 153 in the theca layer of F2 and F1 and the granulosa layer of the F3 follicle. In conclusion, the results indicate that TCDD and PCBs affect apoptosis in chicken ovarian follicles and in consequence may disrupt follicle development.

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Mridula, N., and Tarun Kumar Pant. "On the F3 layer occurrence and drift over the equatorial location of Thiruvananthapuram." Advances in Space Research 69, no. 10 (May 2022): 3717–25. http://dx.doi.org/10.1016/j.asr.2022.02.057.

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Karpachev, A. T., M. V. Klimenko, V. V. Klimenko, and V. P. Kuleshova. "Statistical study of the F3 layer characteristics retrieved from Intercosmos-19 satellite data." Journal of Atmospheric and Solar-Terrestrial Physics 103 (October 2013): 121–28. http://dx.doi.org/10.1016/j.jastp.2013.01.010.

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Dissertations / Theses on the topic "F3-layer"

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Wu, Zhengguang. "A STUDY OF THE F3 LAYER AND IONOSPHERIC HORIZONTAL GRADIENT OBSERVED BY THE ARECIBO INCOHERENT SCATTER RADAR." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501971684516088.

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Conference papers on the topic "F3-layer"

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Batista, I. S., M. A. Abdu, A. M. Silva, and J. R. Souza. "Long Term Trends In F3 Layer Over Fortaleza, Brazil." In 7th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.217.421.

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de Oliveira*, Virginia Klausner, and Paulo Roberto Fagundes. "The formation of F3-layer and the observation of gravity waves during solar maximum and minimum." In 10th International Congress of the Brazilian Geophysical Society & EXPOGEF 2007, Rio de Janeiro, Brazil, 19-23 November 2007. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2007. http://dx.doi.org/10.1190/sbgf2007-408.

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Klausner de Oliveira, Virginia, and Paulo Roberto Fagundes. "The formation of F3-layer and the observation of gravity waves during solar maximum and minimum." In 10th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609-pdb.172.sbgf0376_07.

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Tolstaya, Ekaterina, and Anton Egorov. "Segmentation of Seismic Images." In 31th International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2021. http://dx.doi.org/10.20948/graphicon-2021-3027-564-570.

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In this paper we propose a method of seismic facies labeling. Given the three-dimensional image cube of seismic sounding data, labeled by a geologist, we first train on the part of the cube, then we propagate labels to the rest of the cube. We use open-source fully annotated 3D geological model of the Netherlands F3 Block. We apply state-of-the-art deep network architecture, adding on top a 3D fully connected conditional random field (CRF) layer. This allows to get smoother labels on data cube cross-sections. Pseudo labeling technique is used to overcome training data scarcity and predict more reliable labels for geological units. Additional data augmentation allows also to enlarge training dataset. The results show superior network performance over existing baseline mode.

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Tolstaya, Ekaterina, and Anton Egorov. "Automatic Neural Network-Based Seismic Facies Classification Using Pseudo-Labels." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22084-ms.

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Abstract In this paper we propose a method of seismic facies labeling. Seismic facies labeling task consists of assigning specific geological rock types to the pixels in the seismic cube. In our research we use open-source fully annotated 3D geological model of the Netherlands F3 Block. The dataset is divided into training and test cubes. We use the former to train a state-of-the-art deep learning neural network, adding a 3D conditional random field (CRF) layer as a postprocessing step. We apply the pseudo-labeling technique, where the labels of the test dataset are predicted and added to the training set to get more accurate final prediction. To diversify the training dataset, we also apply different types of augmentations, including a domain specific image warping technique. Using the trained network, we predict the facies labels on the test dataset and compute various metrics. The results suggest superior network performance over the existing baseline model.

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"Routing strategy using local information based on a two layer cellular automaton model." In 23rd International Congress on Modelling and Simulation (MODSIM2019). Modelling and Simulation Society of Australia and New Zealand, 2019. http://dx.doi.org/10.36334/modsim.2019.f3.zhu.

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