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Wyświetlanie 1-15 z 557
Tytuł:
Improved Framework for Blockchain Application Using Lattice Based Key Agreement Protocol
Autorzy:
Oleiwi, Zahraa Ch.
Dihin, Rasha Ai
Alwan, Ali H.
Powiązania:
https://bibliotekanauki.pl/articles/2200725.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
key agreement protocol
lattice based protocol
mutual authentication
Diffie-Hellman protocol
forward secrecy
Opis:
One of the most recent challenges in communication system and network system is the privacy and security of information and communication session. Blockchain is one of technologies that use in sensing application in different important environments such as healthcare. In healthcare the patient privacy should be protected use high security system. Key agreement protocol based on lattice ensure the authentication and high protection against different types of attack especially impersonation and man in the middle attack where the latticebased protocol is quantum-withstand protocol. Proposed improved framework using lattice based key agreement protocol for application of block chain, with security analysis of many literatures that proposed different protocols has been presented with comparative study. The resultant new framework based on lattice overcome the latency limitation of block chain in the old framework and lowered the computation cost that depend on Elliptic curve Diffie-Hellman. Also, it ensures high privacy and protection of patient’s information.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 5--10
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Realization of multiplexer logic-based 2-D block firfilter using distributed arithmetic
Autorzy:
Chowdari, Ch. Pratyusha
Seventline, J. Beatrice
Powiązania:
https://bibliotekanauki.pl/articles/38699398.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
2-D FIR filter
switching-based LUT
distributed arithmetic
block processing
2-D FIR filtr
arytmetyka rozproszona
przetwarzanie blokowe
Opis:
This paper presents a novel systolic two-dimensional (2D) block finite impulse response(FIR) filter architecture using a distributed arithmetic (DA)-based multiplexer look-uptable (DA-MUX-LUT). The proposed DA-MUX-LUT architecture computes the instan-taneous partial-product using the bit vector. The switching-based LUT replaces memory-based structures and reduces hardware complexity. Block processing allows memory reuse,which reduces the number of registers to store the previous input samples. Parallel addersare substituted by a modified carry look-ahead adder (MCLA), which minimizes the delay.Moreover, a resource-sharing concept is introduced to the DA-MUX-LUT block that drastically reduces the adder requirement. The application specific integrated circuit (ASIC)synthesis results show that the proposed DA-MUX-LUT-based 2-D block FIR filter forfilter size 8x8 and block size 4 has 31.22% less delay, 28.66% less area-delay product(ADP), 37.70% less power-delay product (PDP), and occupies almost the same area thanthe existing architecture.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 89-103
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor performance and cut-off wavelength tradeoffs of III-V focal plane arrays
Autorzy:
James, Jonathan Ch.
Haran, Terence L.
Lane, Sarah E.
Powiązania:
https://bibliotekanauki.pl/articles/2204205.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
infrared focal plane arrays
III-V semiconductor infrared detector technologies
infrared sensor performance modelling
infrared sensor design
mid-wave and longwave infrared sensors
Opis:
Infrared detector technologies engineered from III-V semiconductors such as strained-layer superlattice, quantum well infrared photodetectors, and quantum dot infrared photodetectors provide additional flexibility to engineer bandgap or spectral response cut-offs compared to the historical high-performance detector technology of mercury/cadmium/telluride. The choice of detector cut-off depends upon the sensing application for which the system engineer is attempting to maximize performance within an expected ensemble of operational scenarios that define objects or targets to be detected against specific environmental backgrounds and atmospheric conditions. Sensor performance is typically characterised via one or more metrics that can be modelled or measured experimentally. In this paper, the authors will explore the impact of detector cut-off wavelength with respect to different performance metrics such as noise equivalent temperature difference and expected target detection or identification ranges using analytical models developed for several representative sensing applications encompassing a variety of terrestrial atmospheric conditions in the mid-wave and long-wave infrared wavelength bands. The authors will also report on their review of recently published literature concerning the relationships between cut-off wavelength and the other detector performance characteristics such as quantum efficiency or dark current for a variety of detector technologies.
Źródło:
Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144570
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing metals in tension and relaxation at elevated temperatures
Autorzy:
Darrieulat, M.
Aoufi, A.
Desrayaud, CH.
Powiązania:
https://bibliotekanauki.pl/articles/38695715.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
tension testing
viscoplasticity
work hardening
engineering strain
extensometer
relaxation test
strain rate sensitivity
elevated temperature
Opis:
This article describes an apparatus for testing viscoplastic metallic alloys in tension at temperatures up to 400ºC. Its distinctive feature is a two-shelled furnace which encompasses the test-piece. The extensometer is attached to the shoulders of the specimen and remains outside the oven, so that it works at room temperature. The strain εrs in the reduced section inside the tight fitting oven is calculated with the help of a finite element software from the strain εext given by the extensometer. In the elastic range, the set-up was used for the measurement of Young’s moduli. In the plastic and viscoplastic ranges, it was used to draw work-hardening curves and to perform relaxation tests representative of in-service conditions. In this later case, a method to derive the strain rate sensitivity from the decrease with time of the registered stress is presented. The furnace can be easily machined in a mechanical workshop for all shapes and dimensions of test-pieces, so that it can be adapted to various studies of the workability of metallic alloys, especially those which necessitate a rapid rise and precise maintenance in temperature.
Źródło:
Archives of Mechanics; 2023, 75, 1-2; 75-106
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Token Bucket Algorithm with Modernization Techniques to avoid Congestion in DEC Protocol of WSN
Autorzy:
Mohammad, Habibulla
Krishna, K. Phani Rama
Gangadhar, Ch
Mohammed, Riazuddin
Powiązania:
https://bibliotekanauki.pl/articles/27311894.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Packet size
Token bucket
Queue
Base station
Residual energy
congestion
Opis:
A wireless sensor system is an essential aspect in many fields. It consists of a great deal of sensor nodes. These sensor networks carry out a number of tasks, including interaction, distribution, recognition, and power supply. Data is transmitted from source to destination and plays an important role. Congestion may occur during data transmission from one node to another and also at cluster head locations. Congestion will arise as a result of either traffic division or resource allocation. Energy will be wasted due to traffic division congestion, which causes packet loss and retransmission of removed packets. As a result, it must be simplified; hence there are a few Wireless sensor networks with various protocols that will handle Congestion Control. The Deterministic Energy Efficient Clustering (DEC) protocol, which is fully based on residual energy and the token bucket method, is being investigated as a way to increase the energy efficiency. In the event of congestion, our proposal provides a way to cope with it and solves it using this method to improve lifespan of the sensor networks. Experiments in simulation show that the proposed strategy can significantly enhance lifetime, energy, throughput, and packet loss.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 3; 507--513
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Describing Minor 5-Stars in 3-Polytopes with Minimum Degree 5 and No Vertices of Degree 6 or 7
Autorzy:
Batueva, Ts.Ch-D.
Borodin, O.V.
Ivanova, A.O.
Nikiforov, D.V.
Powiązania:
https://bibliotekanauki.pl/articles/32361718.pdf
Data publikacji:
2022-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
planar graph
structural properties
3-polytope
5-star
neighborhood
Opis:
In 1940, in attempts to solve the Four Color Problem, Henry Lebesgue gave an approximate description of the neighborhoods of 5-vertices in the class P5 of 3-polytopes with minimum degree 5. This description depends on 32 main parameters. (6, 6, 7, 7, 7), (6, 6, 6, 7, 9), (6, 6, 6, 6, 11), (5, 6, 7, 7, 8), (5, 6, 6, 7, 12), (5, 6, 6, 8, 10), (5, 6, 6, 6, 17), (5, 5, 7, 7, 13), (5, 5, 7, 8, 10), (5, 5, 6, 7, 27), (5, 5, 6, 6, ∞), (5, 5, 6, 8, 15), (5, 5, 6, 9, 11), (5, 5, 5, 7, 41), (5, 5, 5, 8, 23), (5, 5, 5, 9, 17), (5, 5, 5, 10, 14), (5, 5, 5, 11, 13) Not many precise upper bounds on these parameters have been obtained as yet, even for restricted subclasses in P5. In 2018, Borodin, Ivanova, Kazak proved that every forbidding vertices of degree from 7 to 11 results in a tight description (5, 5, 6, 6, ∞), (5, 6, 6, 6, 15), (6, 6, 6, 6, 6). Recently, Borodin, Ivanova, and Kazak proved every 3-polytope in P5 with no vertices of degrees 6, 7, and 8 has a 5-vertex whose neighborhood is majorized by one of the sequences (5, 5, 5, 5, ∞) and (5, 5, 10, 5, 12), which is tight and improves a corresponding description (5, 5, 5, 5, ∞), (5, 5, 9, 5, 17), (5, 5, 10, 5, 14), (5, 5, 11, 5, 13) that follows from the Lebesgue Theorem. The purpose of this paper is to prove that every 3-polytope with minimum degree 5 and no vertices of degree 6 or 7 has a 5-vertex whose neighborhood is majorized by one of the ordered sequences (5, 5, 5, 5, ∞), (5, 5, 8, 5, 14), or (5, 5, 10, 5, 12).
Źródło:
Discussiones Mathematicae Graph Theory; 2022, 42, 2; 535-548
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of various temperatures and strain-rates combinations on the thermomechanical behavior of 42CrMo steel
Autorzy:
Abdul-Latif, A.
Abed, F.
Oucif, Ch.
Voyiadjis, G. Z.
Powiązania:
https://bibliotekanauki.pl/articles/38695696.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
42CrMo steel
temperature
strain-rate
mechanical characterization
constitutive modeling
Opis:
This paper investigates experimentally the thermomechanical response of 42CrMo steel under several combinations of temperatures and strain-rate. To characterize the flow stress of this highstrength 42CrMo steel, two distinct test configurations were utilized. The first consisted of conventional uniaxial tensile tests conducted at room and elevated temperatures of 523◦K, 723◦K and 923◦K and three quasi-static strain-rates at 0.0015 s−1, 0.015 s−1, and 0.15 s−1. The second test configuration was carried out under dynamic compression using a drop mass bench at room temperature with three different dynamic strain-rates of 300 s−1, 400 s−1, and 500 s−1. Particular attention was paid to key features such as work-hardening (WH), grain size, dynamic strain aging (DSA), formation of microcavities, and their coupling with the influence of temperature/strain-rate combination. The dependence of 42CrMo steels’ flow stress on the quasi-static strain-rate at room temperature was almost insignificant. However, the strain-rate sensitivity increased with increasing temperatures. At high temperatures, different factors contributed to modifying the alloy microstructure which has a significant impact on the alloy’s mechanical properties. Quantification of the micro-cracks density and fractured specimens’ voids was established using scanning electron microscopy (SEM) images. The Voyiadjis–Abed (VA) constitutive model was utilized in describing the flow stress of 42CrMo steels and implemented in the ABAQUS software to develop a robust finite element model capable of accurately simulating variant structural responses of 42CrMo steel alloy.
Źródło:
Archives of Mechanics; 2022, 74, 5; 345-372
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multicriteria Oppositional-Learnt Dragonfly Resource-Optimized QoS Driven Channel Selection for CRNs
Autorzy:
Sirisha Devi, Ch. S. N.
Maloj, Suman
Powiązania:
https://bibliotekanauki.pl/articles/2174446.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cognitive ratio network (CRN)
multicriteria dragonfly optimization
oppositional learning
optimal available channel
QoS metric
Opis:
Cognitive radio networks (CRNs) allow their users to achieve adequate QoS while communicating. The major concern related to CRN is linked to guaranteeing free channel selection to secondary users (SUs) in order to maintain the network’s throughput. Many techniques have been designed in the literature for channel selection in CRNs, but the throughput of the network has not been enhanced yet. Here, an efficient technique, known as multicriteria oppositional-learnt dragonfly resourceoptimized QoS-driven channel selection (MOLDRO-QoSDCS) is proposed to select the best available channel with the expected QoS metrics. The MOLDRO-QoSDCS technique is designed to improve energy efficiency and throughput, simultaneously reducing the sensing time. By relying on oppositional-learnt multiobjective dragonfly optimization, the optimal available channel is selected depending on signal-to-noise ratio, power consumption, and spectrum utilization. In the optimization process, the population of the available channels is initialized. Then, using multiple criteria, the fitness function is determined and the available channel with the best resource availability is selected. Using the selected optimal channel, data transmission is effectively performed to increase the network’s throughput and to minimize the sensing time. The simulated outputs obtained with the use of Matlab are compared with conventional algorithms in order to verify the performance of the solution. The MOLDRO-QoSDCS technique performs better than other methods in terms of throughput, sensing time, and energy efficiency.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 4; 41--46
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of brittle fracture propagation behaviour of hydroxyapatite (HAp) coating in artificial femoral stem component
Autorzy:
Sheng, C.H.
Nagentrau, M.
Ibrahim, N.H.
Powiązania:
https://bibliotekanauki.pl/articles/2201136.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
hydroxyapatite (HAp)
fracture
stress intensity factor (SIF)
artificial femoral stem
hydroksyapatyt (HAp)
złamanie
współczynnik intensywności naprężeń
sztuczny trzon kości udowej
Opis:
Purpose: This study addresses the brittle fracture propagation behaviour modelling of hydroxyapatite (HAp) coating in artificial femoral stem component. Design/methodology/approach: A simple two dimensional flat-on-flat contact configuration finite element model consisting contact pad (bone), Ti-6Al-4V substrate and HAp coating is employed in static simulation. The HAp coating is modelled as elastic layer with pre-microcrack which assumed to be initiated due to stress singularity. Findings: The study revealed that reducing coating thickness, pre-microcrack length and artificial femoral stem elastic modulus along with increasing bone elastic modulus will result in significant stress intensity factor (SIF) to promote brittle fracture propagation behaviour. Research limitations/implications: The influence of coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus on fracture behaviour is examined under different stress ratio using J-integral analysis approach. Practical implications: The proposed finite element model can be easily accommodating different Hap coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus to perform detailed parametric studies with minimal costly experimental works. Originality/value: Limited research focussing on brittle fracture propagation behaviour of HAp coating in artificial femoral stem component. Thus, present study analysed the influence of coating thickness, pre-microcrack length, bone and artificial femoral stem elastic modulus on stress intensity factor (SIF) of HAp coating.
Źródło:
Archives of Materials Science and Engineering; 2022, 113, 3; 34--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sire pedigree error estimation and sire verification of the Taiwan dairy cattle population by using SNP markers
Autorzy:
Chao, C.H.
Yeh, Y.H.
Chen, Y.M.
Lee, K.H.
Wang, S.H.
Lin, T.Y.
Powiązania:
https://bibliotekanauki.pl/articles/16539078.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Holstein cattle
genetic testing
sire pedigree
Opis:
Information regarding the correct pedigree of and relationship between animals is useful for managing dairy breeding, reducing inbreeding, estimating breeding value, and establishing correct breeding programs. Additionally, the successful implementation of progeny testing is crucial for improving the genetics of dairy cattle, which depends on the availability of correct pedigree information. Incorrect pedigree information leads to bias in bull evaluation. In this study, Neogen GeneSeek Genomic Profiler (GGP) 50K SNP chips were used to identify and verify the sire of Taiwanese Holstein dairy cattle and analyze the reasons that lead to incorrect sire records. Samples were collected from 2,059 cows of 36 dairy farms, and the pedigree information was provided by breeders. The results of sire verification can be divided into three categories: submitted unconfirmed sire, submitted confirmed sire, and incorrectly submitted verified sire. Data on the sires of 1,323 (64.25%) and 572 (27.78%) dairy cows were verified and discovered, respectively. Sires of 1,895 (92.03%) dairy cattle were identified, which showed that the paternal pedigree of dairy cattle could be discovered and verified through genetic testing. An error-like analysis revealed that the data of 37 sires were incorrectly recorded because the bull’s NAAB code number was incorrectly entered into the insemination records: for 19 sires, the wrong bull was recorded because the frozen semen of a bull placed in the wrong storage tank was used, 6 had no sire records, and for 12 sires, the NAAB code of the correct bull was recorded but with a wrong stud code, marketing code, or unique number for the stud or breed. To reduce recorded sire error rates by at least 27.78%, automated identification of the mated bull must be adopted to reduce human error and improve dairy breeding management on dairy farms.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 1; 61-65
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction of periodontal disease via retentive ligature, lipopolysaccharide injection, and their combination in a rat model
Autorzy:
Mustafa, H.
Cheng, C.H.
Radzi, R.
Fong, L.S.
Mustapha, N.M.
Dyary, H.O.
Powiązania:
https://bibliotekanauki.pl/articles/2087105.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alveolar bone
periodontal disease
Porphyromonas gingivalis lipopolysaccharide
retentive ligature
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 3; 365-373
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leveraging Transfer Learning to Identify Food Categories
Autorzy:
Kolla, J. V. V.
Vemula, P. Ch.
Chakravarthy, S.
Naidu, B. S.
Patibandla, D.
Powiązania:
https://bibliotekanauki.pl/articles/2023418.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
convolutional neural networks
transfer learning
domain similarity
fine-tuning
konwolucyjne sieci neuronowe
uczenie się przez przeniesienie
podobieństwo dziedzin
dostrajanie
Opis:
In today’s scenario, recognition of pictured food dishes automatically has significant importance. During the COVID-19 pandemic, there was a decline in people visiting restaurants for their dietary requirements. So many restaurants started offering their services online. This situation caused a demand for better categorization of food into various categories on a large scale by companies that facilitated these services. It is challenging to congregate a large dataset of food categories, so it is complex to build a generalized architecture. To solve this issue, In this paper, domain-specific transfer learning is used to build the model using some standard architectures like VGGNET, RESNET, and EFFICIENTNET family, which are trained on popular benchmark datasets such as IMAGENET, COCO, etc. The similarity between the source and target datasets is calculated to find the best source dataset, and the one with the highest similarity is chosen for transfer learning. The solution proposed in this paper outperforms some of the existing works on categorizing food items.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 101-109
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutritional Properties, Antioxidant and Antihaemolytic Activities of the Dry Fruiting Bodies of Wild Edible Mushrooms Consumed by Ethnic Communities of Northeast India
Autorzy:
Kokoti, Merilin
Hazarika, Dibiya J.
Parveen, Assma
Dullah, Samim
Ghosh, Alokesh
Saha, Dipankar
Barooah, Madhumita
Boro, Robin Ch.
Powiązania:
https://bibliotekanauki.pl/articles/2019175.pdf
Data publikacji:
2021-12-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antihaemolytic activity
basidiomycota
radical scavenging activity
nutrients
organic acids
phenolic acids
Opis:
A variety of cultivated mushrooms in Northeast India are well known for their taste, nutritional and medicinal benefits. Many wild-growing mushrooms are also consumed due to their exotic flavours and tastes; however, the scientific exploration of their nutritional and bioactive properties is still negligible. In the present study, the 32 wild edible mushroom samples of 11 species collected from different parts of Northeast India were evaluated for their proximate composition, mineral and vitamin (ascorbic acid and riboflavin) contents, antioxidant and antihaemolytic activity, and profiles of organic and phenolic acids. Lentinus sajor-caju and Lentinus squarrosulus had the highest carbohydrate content (49.80 g/100 g dry weight (d.w.) and 46.36 g/100 g d.w., respectively), crude protein content (20.72 g/100 g d.w. and 20.54 g/100 g d.w., respectively) and a considerable content of minerals. The highest fat content was determined in Lentinus velutinus (7.17 g/100 g d.w.). Among the minerals, potassium was found as the most abundant in all the samples. The extracts of L. sajor-caju, L. squarrosulus, and Pleurotus pulmonarius were characterized by the highest antioxidant activity, while these of L. sajor-caju, Pleurotus ostreatus, P. pulmonarius and Agaricus bisporus showed the highest antihaemolytic potential. The HPLC analysis allowed determining the high contents of ascorbic acid and a few organic and phenolic acids such as lactic acid, gallic acid, 3,4-dihydroxybenzoic acid and trans-cinnamic acid in the tested mushrooms. Other compounds viz. citric acid, caffeic acid, riboflavin, vanillic acid, pyruvic acid, and p-coumaric acid were detected with variations. This study established the nutritional and health-promoting benefits of wild edible mushrooms of Northeast India region for consumption as functional foods in human diet.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2021, 71, 4; 463-480
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualitative and quantitative evaluation of secondary metabolites of different plant extracts of Nothapodytes foetida (Wight) Sleumer an important endangered medicinal tree
Autorzy:
Bai, D. Sunitha
Suvarchala, V.
Pavani, Ch.
Chaithanya, G.
Spoorthi, V.
Shasthree, T.
Powiązania:
https://bibliotekanauki.pl/articles/1839343.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Camptothecin
phytochemicals
alkaloids
flavonoids
glycosides
tannins
phenols
triterpenoids
saponins
Nothapodytes foetida
Opis:
The present study of phytochemical screening has revealed valuable information about the chemical constituents of Nothapodytes foetida. Phytochemical analysis of leaves, stem, bark and root extracts of Nothapodytes foetida was performed using different solvent systems such as chloroform, butanol, hexane, methanol and acetonitrile for the presence of different phytochemicals with standard procedures. The phytochemical screening (both qualitative and quantitative) of variousplant extracts of Nothapodytes foetida revealed the presence of different phytoconstituents such as alkaloids, flavonoids, glycosides, tannins, phenols and triterpenoids. Among all the solvents tested, methanol, butanol and chloroform extract of leaf, stem, bark and root showed high concentration of all phytoconstituents compared to hexane and acetonitrile solvent extracts. The total quantity of secondary metabolites was evaluated by using the standard procedures and the line of regression and the regression coefficient estimated from the calibration curve of various standards. The highest quantity of phytoconstituent present in the plant extracts was identified to be alkaloids. The alkaloid content of leaf was evaluated to be 66.11±0.47, whereas stem possess 56.27±0.38, bark 59.02±0.17 and root 62.34±0.27 mg AE/gm of extracts and subsequent high amounts of phytoconstituents identified was flavonoids, tannins, phenols and saponins. Phytochemical screening of Nothapodytes foetidaused in the medical field for the design of new drugs.
Źródło:
World Scientific News; 2021, 162; 43-59
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anorexia nervosa: A literature review
Autorzy:
Iliadis, Ch.
Frantzana, A.
Ouzounakis, P.
Kourkouta, L.
Powiązania:
https://bibliotekanauki.pl/articles/1918943.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Anorexia nervosa
health problems and treatment.
Opis:
Introduction: Anorexia nervosa is a food intake disorder characterized by acute weight loss that it could cause severe psychosomatic problems. Purpose: To present the data and information as well as the treatment related to Anorexia nervosa. Materials and methods: The study material consisted of reviewed articles on the topic found in Greek and globally accepted electronic databases, Pubmed, Scopus, Medline, Google Scholar, regarding the effects of Anorexia nervosa on health and its treatment. Results: Initial symptoms of Anorexia nervosa and Bulimia Nervosa may be characterised by body-related negative interpretation bias, distorted body image and pronounced body dissatisfaction. Anorexic patients refuse to eat with their family or in public places. They lose weight by drastically reducing their total food intake, with a disproportionate reduction in the amount of meals containing carbohydrates and fats. The term Anorexia is unfortunate, because a decrease in appetite does not occur. Patients are constantly hungry and they are constantly thinking about food, but they refuse it. An indication of their way of thinking is that they often collect recipes or prepare complex meals for others. Conclusions: Anorexia nervosa is a disease that connects the physical with the mental dimension of health. A person's disharmonious relationship with oneself, which may have its roots in a dysfunctional family context or in a demanding and competitive social environment, finds the way to be manifested through the individual's reflection on food.
Źródło:
Progress in Health Sciences; 2020, 10(2); 74-79
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 557

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