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    Wyświetlanie 1-13 z 13
    Tytuł:
    Application of azoxystrobin fungicide improves drought tolerance in tomato, via enhancing physio-biochemical and anatomical feature
    Autorzy:
    Ali, A.A.I.
    Desoky, E-S.M.
    Rady, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11895.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2019, 76
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of working capital management on SMEs profitability in Malaysia
    Wpływ zarządzania kapitałem pracy na rentowność MŚP w Malezji
    Autorzy:
    Gorondutse, A. H.
    Ali, R. A.
    Abubakar, A.
    Naalah, M. N. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/405447.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    working capital
    working capital management
    SMEs
    profitability
    Malaysia
    kapitał obrotowy
    zarządzanie kapitałem obrotowym
    MŚP
    rentowność
    Malezja
    Opis:
    The paper examines the effects of working capital management on Malaysian SMEs profitability within the sight of control factors measured by the size of the firm, leverage, and sales growth. Secondary data was drowned from Companies Commission of Malaysia, database for 66 SMEs in Malaysia for the period between 2006-2012. Panel data regressions were applied in the analysis. Empirical results established a negative effect of working capital administration measures: Stock Turnover in Days, Days Account Receivables, and Cash Conversion Cycle on SMEs benefit intermediaries, Return on Equity (ROE) and Return on Assets. The results also established a positive effect of Net Operating Profit on Cash Conversion Cycle. Furthermore, the study also revealed a positive effect of Days Account Payables on SME’s Return of Asset and Return of Equity, yet having a negative effect on Net operating Profit. The findings imply that profitability of Malaysian SMEs relies upon effective working capital management. The results imply that Profitability of Malaysian SMEs depends upon effective working capital management. The paper contributes empirical evidence on the effect of working capital on Malaysian SMEs.
    Artykuł analizuje wpływ zarządzania kapitałem obrotowym na rentowność w MŚP Malezji pod kątem czynników kontrolnych mierzonych wielkością firmy, dźwignią finansową i wzrostem sprzedaży. Wtórne dane zostały uzyskane z Komisji Firm Malezji, bazy danych dla 66 MŚP w Malezji w latach 2006-2012. W analizie zastosowano regresję danych panelowych. Wyniki empiryczne wykazały negatywny wpływ narzędzi zarządzania kapitałem obrotowym: rotacja zapasów w dniach, należności z tytułu dni płatniczych i cykl konwersji gotówki do pośrednikach świadczeń MŚP, zwrot z kapitału własnego i zwrot z aktywów. Wyniki wykazały również pozytywny wpływ operacji netto. Ponadto, badanie wykazało również pozytywny wpływ zobowiązań z tytułu płatności w dniach na zwroty aktywów i zwrotu kapitałów własnych MŚP, co jednak ma negatywny wpływ na zysk netto z działalności operacyjnej. Wyniki badania sugerują, że rentowność malezyjskich MŚP zależy od Zarządzania kapitałem obrotowym. Wyniki sugerują, że rentowność malezyjskich MŚP zależy od skutecznego zarządzania kapitałem obrotowym. Artykuł ten stanowi dowód empiryczny na temat wpływu kapitału obrotowego na malezyjskie MŚP.
    Źródło:
    Polish Journal of Management Studies; 2017, 16, 2; 99-109
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a linear quadratic regulator based on genetic model reference adaptive control
    Autorzy:
    Abdullah, Abdullah I.
    Mahmood, Ali.
    Thanoon, Mohammad A.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314263.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    model reference adaptive control
    gradient approach
    Linear Quadratic Regulator
    genetic algorithm
    Opis:
    The conventional control system is a controller that controls or regulates the dynamics of any other process. From time to time, a conventional control system may not behave appropriately online; this is because of many factors like a variation in the dynamics of the process itself, unexpected changes in the environment, or even undefined parameters of the system model. To overcome this problem, we have designed and implemented an adaptive controller. This paper discusses the design of a controller for a ball and beam system with Genetic Model Reference Adaptive Control (GMRAC) for an adaptive mechanism with the MIT rule. Parameter adjustment (selection) should occur using optimization methods to obtain an optimal performance, so the genetic algorithm (GA) will be used as an optimization method to obtain the optimum values for these parameters. The Linear Quadratic Regulator (LQR) controller will be used as it is one of the most popular controllers. The performance of the proposed controller with the ball and beam system will be carried out with MATLAB Simulink in order to evaluate its effectiveness. The results show satisfactory performance where the position of the ball tracks the desired model reference.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 3; 75--81
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity of Brassica rapa germplasm of Khyber Pakhtunkhwa Pakistan revealed by molecular markers
    Autorzy:
    Ali, N.
    Ali, S.
    Khan, N.U.
    Jan, S.A.
    Rabbani, M.A.
    Hussain, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/12690092.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    Pakistan
    plant breeding
    Brassica rapa
    germplasm
    genetic diversity
    plant genotype
    molecular marker
    SSR marker
    Opis:
    A total of 96 indigenous Brassica rapa accessions were collected from different locations of Khyber Pakhtunkhwa, Pakistan. Simple Sequence Repeats (SSR) markers were used to identify the most diverse genotypes among the collected lots. Twenty six (26) different SSR primers were used for (genetic) variability among collected genotypes. These primers were selected from literature based on their previous results. These primers produced 135 scorable bands of which 75 were polymorphic, with an average of 55.5% polymorphic loci, and reflected the broader genetic background of the collected genotypes. An average 2.88 polymorphic bands with an average PIC value of 0.49 was recorded. Unweighted Pair Group Method with Arithmetic Mean (UPGMA) divided all genotypes into three main groups. Group one contained three clusters, while group two and three had four and two clusters each. Based on the UPGMA dendrogram, genotypes collected from Kohat, Bannu, Swat and Haripur showed considerable amount of variation. From the present study, it is concluded that SSR markers can be proved as the best tool for the genetic variability of other local and exotic B. rapa genotypes.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 57-65
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Constituents and Insecticidal Activity of Senna italica Mill. from the Sudan
    Autorzy:
    Yagi, S.
    El Tigani, S.
    Ali, M.
    Elkhidir, I.
    Mohammed, A. M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412035.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Senna italica
    Fabaceae
    Caesalpiniaceae
    sennosides
    anthraquinone
    bianthrones
    insecticidal activity
    Opis:
    The chemical constituents and insecticidal activity of the pods of Senna italica (Caesalpiniaceae, Fabaceae) were investigated. From the chloroform extract of pods, physcion, chrysophanol, chrysophanol-10,10′-bianthrone, chrysophanol-physcion bianthrone and chrysophanol-isophyscion bianthrone, were isolated and characterized using different spectral methods. The GC-MS of the n-hexane extract revealed that the major chemical constituents of the oil were 2,6,-di-sec-butylphenol (36.69 %), di-n-octylphthalate (12.06 %), eicosane (5.46 %), tetratriacontane (4.87 %) and 2,2'-methylenebis[6-(1,1-dimethyl)-4-methylphenol (4.18 %). The n-hexane extract showed potent insecticidal activity (100 %) against Callosbruchus analis F. This study suggests that S. italica pods cannot be a source of sennosides but for other bioactive compounds.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 146-151
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity of North African Thymus algeriensis in Tunisia: Population structure and implication for conservation
    Autorzy:
    Ben El Hadj Ali, I.
    Guetat, A.
    Boussaid, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41188.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    genetic diversity
    North Africa
    Thymus algeriensis
    Tunisia
    population structure
    molecular marker
    natural population
    conservation
    Opis:
    The genetic diversity within and among nine natural populations of Thymus hirtus Willd. subsp. algeriensis (Boiss. et Reut.) Murb. from different geographical and bioclimatic zones were assessed using Random Amplified Polymorphic DNA data. A total of 154 bands were generated from seven selected primers. 141 bands were polymorphic (P=91.56%). The genetic diversity within a population based on Shannon's index which was high (H'pop=0.307) and varied according to bioclimatic zones. A high genetic differentiation among populations (GST=0.335 and FST=0.296) was revealed, suggesting a population isolation and a low level of gene flow among them. The major proportion of the variation was attributable to individual differences within populations. The genetic structure is in accordance with geography distances. The Neighbour- joining tree based on Nei's and Li's genetic distance among individuals showed that individuals from each population clustered together. The UPGMA dendrogram based on FST values revealed three clusters each of them includes populations closuring to their geographical origin. The high genetic structure of populations resulted from genetic drift caused both by the habitat fragmentation and the low size of most populations. The in situ conservation should interest all populations. The ex situ conservation should be based on the collection of seeds rather within than among populations because of the maximum of variation was revealed within populations.
    Źródło:
    Dendrobiology; 2012, 67
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity of wild Thymus capitatus (Lamiaceae) in Tunisia using molecular markers
    Autorzy:
    Ben El Hadj Ali, I.
    Guetat, A.
    Boussaid, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41663.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    genetic diversity
    wild plant
    Thymus capitatus
    Lamiaceae
    Tunisia
    molecular marker
    habitat fragmentation
    conservation strategy
    genetic structure
    Opis:
    In Tunisia, Thymus capitatus L. populations are severely destroyed due to deforestation and over-collecting. The species occurs in small scattered populations decreasing progressively in size. Yet, no conservation or improvement programs are attempted to preserve and promote the potential value of this resource. In this work, we assessed the genetic diversity of nine Tunisian populations of Thymus capitatus L. from different bioclimates, using 103 polymorphic randomly amplified polymorphic DNA (RAPD) loci. The analysis of the genetic variation within and among populations is primordial to elaborate conservation and improvement programs. The species showed a low diversity within populations (0.276
    Źródło:
    Dendrobiology; 2012, 68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and microstructure of alkali activated mortar containing unexpanded clay
    Autorzy:
    Nasser, I.F.
    Ali, M.A.
    Kadhim, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201132.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    alkali-activated mortar
    pozzolan
    unexpanded clay
    flexural toughness
    scanning electron microscope
    thermal insulation
    pucolana
    glina nie spulchniona
    wytrzymałość na zginanie
    skaningowy mikroskop elektronowy
    izolacja termiczna
    Opis:
    Purpose: In building constructions, due to the decrease of local raw materials and for sustainability purpose, beside the need of light pieces to be used in roofing and false ceiling; an alkali-activated mortar is the new development where pozzolanic material is used instead of cement and activated by an alkaline solution. Therefore, in this research, alkali-activated mortar containing unexpanded clay as a fine aggregate with a dry density of 1652 kg/m3, compressive strength of 3.2 MPa, and thermal conductivity of 0.4 (W/m.K) was produced ,also boards were performed in a dimension of 305×152×12 mm as to use them in false ceiling, and reinforced with 0.25 and 0.5% steel fibre to improve their toughness by 370.8% and 1146.1% compared with reference boards, which made them good choice to used them in roofing and secondary ceiling. Design/methodology/approach: For preparation of alkali-activated mortar, low calcium fly ash (FA) was used as a source binder material. In addition, super-plasticizer and unexpanded clay as a fine aggregate (produce from the crushed artificial aggregate) in the ratio of 1:2.75 fly ash/fine aggregate. The paste was prepared by mixing fly ash with an alkali silicate solution, in a solid-to-liquid ratio of 0.4. Alkali silicate activator was prepared by mixing the NaOH and Na2SiO3 solutions at the mass ratios of 2.5. The concentrations of the NaOH was the same molarity of (14M).To improve the mechanical properties of the reference mortar mixture ,steel fibre with 0.25 and 0.5% content were added to the mix .The specimens were tested for water absorption, dry density, compressive strength, flexural strengths, flexural toughness, and thermal conductivity, in addition to the Scanning Electron Microscope test (SEM) for all mortar mixes. Alkali-activated mortar boards with (305×152×12 mm) were prepared and tested for flexural strength and toughness. Findings: The results indicated that the modulus of rupture for mortar boards reinforced with 0.25 and 0.5% steel fibre exhibits an increase of (3.68-12.10)%. In comparison, the toughness is increased by about 370.8% and 1146.1%, respectively, as compared with the reference mortar (without fibre) which made them resistance to accident, in addition to use them in roofing due to their thermal insulation. Research limitations/implications: Further research is needed to make a similar board using another sustainable material. We can examine the thermal insulation that we can get from these board, especially in the building in Iraq which the weather faces high temperatures. Practical implications: There is a by-product that we could get from the electricity station in Iraq. We must study how we get rid of it. Originality/value: This paper investigate how to produce a new light board using artificial aggregate made from unexpanded clay, which has many benefits in building insulation roofing.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 113, 2; 56--68
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Debt maturity and family related directors : evidence from a developing market
    Zapadalność zadłużenia i dyrektorzy związani z rodziną : dowody z rozwijającego się rynku
    Autorzy:
    Hussain, H. I.
    Abidin, I. S. Z.
    Ali, A.
    Kamarudin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/404736.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    debt maturity
    capital structure
    family related directors
    board composition
    corporate governance
    family firms
    zapadalność zadłużenia
    struktura kapitałowa
    dyrektorzy rodzinni
    skład zarządu
    ład korporacyjny
    firmy rodzinne
    Opis:
    This paper examines the debt maturity structures of Malaysian firms based on the presence of family-related directors (FRDs) on boards. The motivation is derived from the board composition literature, which highlights reforms taken place over the years in order to ensure proper governance mechanisms. Conversantly, debt maturities are also linked to reductions in agency costs whereby firms with short-term borrowings will be subject to greater levels of monitoring by markets. Furthermore, this reduces information asymmetry. Thus, the paper evaluates the effectiveness of FRDs in alleviating the agency problem by studying the trade-off of such presence on debt maturity structures. The study finds that firms with the presence of FRDs tend to opt for longer maturity structures. These points towards a substitution effect where firms with FRDs will not rely on short-term borrowing as a mechanism for reducing agency problems. The findings of the study are further validated given that the presence of FRDs is not motivated by firms matching strategy of assets versus liabilities. However, these firms also opt for long-term borrowing in order to mitigate potential liquidity problems. The study further documents that these firms face lower bankruptcy costs. Interestingly, the authors also document that FRD opt to lengthen maturity structures during periods of increase in share prices indicating that control by family members tend to take into consideration shareholders’ wealth maximization. The finding is valid given that most firms with FRD also tend to have significant ownership by families.
    W niniejszym artykule przeanalizowano strukturę zapadalności długu malezyjskich firm w oparciu o obecność dyrektorów rodzinnych (FRD) w zarządach. Motywacja pochodzi z literatury poświęconej składom zarządów, która podkreśla reformy, które miały miejsce od lat w celu zapewnienia odpowiednich mechanizmów zarządzania. Konsekwentnie, zapadalność długu jest również powiązana z obniżeniem kosztów pośrednictwa, w wyniku czego firmy o pożyczkach krótkoterminowych będą podlegać większemu monitorowaniu na rynkach. Ponadto zmniejsza to asymetrię informacji. W związku z tym, w artykule dokonano oceny skuteczności FRD w łagodzeniu problemu agencji poprzez zbadanie zysku takiej obecności w strukturach dojrzałości długu. Badanie wykazało, że firmy z obecnością FRD wybierają dłuższe struktury dojrzałości. Wskazuje to na efekt substytucyjny, w którym firmy z FRD nie będą polegać na pożyczkach krótkoterminowych jako mechanizmie zmniejszającym problemy agencji. Wyniki badania są dalej potwierdzane, ponieważ obecność FRD nie jest uzasadniona przez firmy, które dopasowują strategię aktywów do zobowiązań. Firmy te również wybierają długoterminowe pożyczki, aby złagodzić potencjalne problemy z płynnością. Badanie to dokumentuje również, że firmy te ponoszą niższe koszty bankructwa. Co ciekawe, autorzy dokumentują również, że FRD opowiadają się za przedłużeniem struktur zapadalności w okresach wzrostu cen akcji, wskazując, że kontrola członków rodziny ma tendencję do uwzględniania maksymalizacji zamożności akcjonariuszy. Stwierdzenie jest słuszne, biorąc pod uwagę, że większość firm z FRD ma również znaczny udział rodzinny w strukturze własności.
    Źródło:
    Polish Journal of Management Studies; 2018, 18, 2; 118-134
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of chilling exposure and vapor heat treatment duration on the quality of sweet orange during simulated marketing
    Autorzy:
    Hussain, I.
    Rab, A.
    Khan, N.U.
    Sajid, M.
    Ali, N.
    Khan, S.M.
    Ali, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543553.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    Sweet orange fruits were exposed to vapor heat treatment (50°C) in water bath for 0, 5, 10, 15 and 20 min in plastic covered structure. The data were recorded on different physico chemical factors immediately after the storage and after seven days simulated marketing under ambient condition (20°C). Low temperature storage enhanced weight loss, surface pitting, disease incidence, total soluble solids accumulation, TSS/Acid ratio but decreased reducing sugars, acidity and ascorbic acid content. Chilling exposure up to 45 days had no significant effect on weight loss and TSS. However, increased weight loss (2.63%), TSS (11.75), TSS/Acid ratio (8.45 ºBrix), disease incidence (8.93%) and lowest reducing sugars (3.90) were noted in sweet orange exposed to chilling temperature for 75 days. Among the VHT durations, the highest weight loss (2.29%) was found in VHT for 0 min while the highest TSS (11.81 ºBrix), TSS/Acid ratio (8.10) and disease incidence (6.22%) and least reducing sugars (4.12%) were found in VHT 20 for min. Vapor heat treatment ranging from 5–10 min resulted in lowest weight loss (1.79%), TSS (10.81 ºBrix) TSS/Acid ratio (7.33), disease incidence (1.00%) and highest reducing sugars (4.75%) in sweet orange fruits. However, non-reducing sugars were least affected by both LTSs and VHTs. It is concluded that the chilling exposure (5°C) beyond 45 days aggravated the decline of fruit physio-chemical quality characteristics. Whereas, VHT with 5–10 min maintained the sweet orange fruit quality during simulated marketing; however, VHT of 15–20 min adversely affected the sweet orange fruit quality attributes.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 5; 39-47
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethnobotanical investigation of significant seasonal medicinal weeds of Toba Tek Singh District, Punjab, Pakistan
    Autorzy:
    Tufail, M.
    Hussain, K.
    Nawaz, K.
    Iqbal, I.
    Arshad, N.
    Shahzadi, A.
    Javed, A.
    Nazeer, A.
    Bashir, Z.
    Qurban, M.
    Zeb, J.
    Ali, S.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049359.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    weeds
    ethnobotany
    flora
    survey
    chwasty
    etnobotanika
    badanie
    Opis:
    Introduction: Medicinal plants are found throughout the world but most are considered weeds. They are – directly or indirectly – the major source of medicines in pharmaceutical and herbal industries. Formulations used to prepare medicines or the method of use for these plants are mainly based on folk or traditional knowledge. This folk knowledge is not documented in many areas and needs to be explored. Objectives: This study was aimed to enlist the seasonal weed species with traditional medicinal usage in Toba Tek Singh District, Punjab, Pakistan. Methods: Field surveys were arranged in winter and summer 2019–2020 to enlist the important medicinal weeds and traditional knowledge of the local community. Data collected were as follows: local name of weed, medicinal use, method and part used. Results: Numerous wild perennial, biennial and annual plants were identified, 30 of them were ethnomedicinally important in the local community. They were grouped in 16 families. It was found that whole weed is used in many prescriptions (37%). Achyranthes aspera L. (Amaranthaceae) was the most common weed used in treating fevers, respiratory problems and asthma. Cichorium intybus L. (Asteraceae) was used in summer drinks to reduce thirst, improve digestion and liver function. Chenopodium album L. (Amaranthaceae) was used with 0.71 UV and 0.147 RFC values. Medicago polymorpha L. (Fabaceae) was used to treat kidney, intestinal and bladder infections. Its UV was 0.65 and RFC was 0.121. Tribulus terrestris L. (Zygophyllaceae) was used in impotency treatment, and in the removal of kidney stones and urinary tract infections treatment. It has 0.63 UV and 0.21 RFC values. This weed also showed the highest Fidelity Level (FL) (77%), as compared to other weeds. Conclusion: It was concluded that there are many significant medicinal weeds in the Toba Tek Singh District, Punjab, Pakistan that are used in traditional medicines in treating various disorders. These plants also showed herbal or pharmacological importance that can be used to develop medicine at commercial scale.
    Źródło:
    Herba Polonica; 2021, 67, 2; 29-38
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Nanocrystalline Tetragonal Zirconia Stabilized with CaO, MgO and $Y_2O_3$
    Autorzy:
    Sahin, O.
    Demirkol, İ.
    Göcmez, H.
    Tuncer, M.
    Ali Cetinkara, H.
    Salih Güder, H.
    Sahin, E.
    Rıza Tuncdemir, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399801.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    62.20.F-
    Opis:
    The citrate gel method, similar to the polymerized complex method, was used to synthesize homogeneous tetragonal zirconia at 1000°C. Nanocrystalline tetragonal phase has been fully stabilized at wide temperature range with 10 mol.% CaO, MgO, and $Y_2O_3$ addition. Scanning electron microscopy, X-ray diffraction, and microhardness tests are used to characterize synthesized materials. The grain size and dislocation density were calculated from X-ray diffraction data. The examined material exhibits indentation size effect behavior. Results revealed that the Vickers and Knoop microhardness are dependent on indentation test load. Geometrically necessary dislocation model and modified proportional resistance model are used to analyze the load dependence of the microhardness. The highest hardness values were obtained for the samples with CaO addition; however the lowest values were acquired for sample stabilized with $Y_2O_3$ by using both Knoop and Vickers techniques. This situation might be explained using the Hall-Petch relation.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 296-298
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plants take action to mitigate salt stress: Ask microbe for help, phytohormones, and genetic approaches
    Autorzy:
    Hewedy, Omar A.
    Mahmoud, Ghada Abd-Elmonse
    Elshafey, Naglaa F.
    Khamis, Galal
    Karkour, Ali M.
    Abdel Lateif, Khalid S.
    Amin, Basma H.
    Chiab, Nour
    El-Taher, Ahmed M.
    Elsheery, Nabil I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174285.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Bacillus
    ion homeostasis
    osmoprotectants
    osmotic stress
    photosynthesis
    ROS scavenging
    Opis:
    Global agriculture is a pivotal activity performed by various communities worldwide to produce essential human food needs. Plant productivity is limited by several factors, such as salinity, water scarcity, and heat stress. Salinity significantly causes short or long-term impacts on the plant photosynthesis mechanisms by reducing the photosynthetic rate of CO2 assimilation and limiting the stomatal conductance. Moreover, disturbing the plant water status imbalance causes plant growth inhibition. Up-regulation of several plant phytohormones occurs in response to increasing soil salt concentration. In addition, there are different physiological and biochemical mechanisms of salt tolerance, including ion transport, uptake, homeostasis, synthesis of antioxidant enzymes, and osmoprotectants. Besides that, microorganisms proved their ability to increase plant tolerance, Bacillus spp. represents the dominant bacteria of the rhizosphere zone, characterised as harmless microbes with extraordinary abilities to synthesise many chemical compounds to support plants in confronting salinity stress. In addition, applying arbuscular mycorrhizal fungi (AMF) is a promising method to decrease salinity-induced plant damage as it could enhance the growth rate relative to water content. In addition, there is a demand to search for new salt-tolerant crops with more yield and adaptation to unfavourable environmental conditions. The negative impact of salinity on plant growth and productivity, photosynthesis, stomatal conductance, and changes in plant phytohormones biosynthesis, including abscisic acid and salicylic acid, jasmonic acid, ethylene, cytokinins, gibberellins, and brassinosteroids was discussed in this review. The mechanisms evolved to adapt and/or survive the plants, including ion homeostasis, antioxidants, and osmoprotectants biosynthesis, and the microbial mitigate salt stress. In addition, there are modern approaches to apply innovative methods to modify plants to tolerate salinity, especially in the essential crops producing probable yield with a notable result for further optimisation and investigations.
    Źródło:
    Journal of Water and Land Development; 2022, 55; 1--16
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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