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Wyświetlanie 1-10 z 13
Tytuł:
Metal resistance and uptake by Trichosporon asahii and Pichia kudriavzevii isolated from industrial effluents
Autorzy:
Ilyas, S.
Rehman, A.
Tematy:
Trichosporon asahii
Pichia kudriavzevii
heavy metals
oxidative stress
bioaccumulation
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/204832.pdf  Link otwiera się w nowym oknie
Opis:
Metal-resistant yeast strains, Trichosporon asahii and Pichia kudriavzevii, were grown-well onto YPD medium at 37°C (pH 6) and 30°C (pH 7), respectively. Tolerance values determined in T. asahii were 35 mM (Pb), 33 mM (Cu), 30 mM (As) and 10 mM (Cd) while P. kudriavzevii resisted up to 31 mM (Pb), 27 mM (Cu), 15 mM (Cd) and 12 mM (As). Yeasts grown in Minimal Salt Medium (MSM) were treated separately with metal challenge (100 mg/L) for 2 days. T. asahii showed elevated glutathione (GSH) level with Cd (83.06), As (81.87), Pb (66.88) and Cu (56.19) mM/g which was 70 (Cu), 69.87 (Pb), 56.47 (As) and 52.76 (Cd) in P. kudriavzevii as compared to the control. The glutathione (GSH): glutathione disulfi de (GSSG) ratio was decreased with all treated heavy-metals except Cd in T. asahii and increased with Cu and Pb in P. kudriavzevii. T. asahii could remove 78% (Cd), 72% (As), 85% (Cu) and 94.5% (Pb) from the medium after 12 days while was able to uptake 44.8, 41, 62 and 72 mg/g Cd, As, Cu and Pb, respectively. Likewise, P. kudriavzevii was able to remove 61% (Cd), 62% (As), 61% (Cu) and 87% (Pb) after 12 days of incubation and also showed capacity to uptake 36.8, 48, 40 and 57 mg/g Cd, As, Cu and Pb, respectively. Total protein profi ling of yeasts revealed marked differences in banding pattern due to increased oxidation under metal stressed conditions. High metal uptake ability makes T. asahii and P. kudriavzevii potential candidates to remove metals from the environment.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convection rolls and individual particles movements in horizontally vibrated granular particles system
Autorzy:
Rehman, A.
Wu, Ping
Li, Li
Zhang, Shiping
Wang, Li
Tematy:
45.70.-n
47.57.Gc
47.52.+j
47.57.Qk
83.80.Fg
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1058505.pdf  Link otwiera się w nowym oknie
Opis:
Convection in horizontally vibrated granular systems is significant for scientists and engineers for their importance in the field of mining, geo-physics, and pharmaceutical etc. This research work studied three types of convection rolls, "Homogeneous convection roll", "lower-right diagonal convection roll" and "upper-right diagonal convection roll" which occurred in a square container filled with binary granular particles mixture of sized d=(4.0±0.2) mm and d=(8.0±0.2) mm. Container was vibrated horizontally with low frequencies f and low dimensionless acceleration Γ. Helical movement was observed along the walls perpendicular to direction of motion while straight-line movement along the walls horizontal to direction of motion. Helical and straight-line movements of particles along the walls are the part of convection rolls. A heap appeared due to vibration, which has dominant effect on the convection rolls. Heap position is function of frequency f and dimensionless accelerations Γ.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric optimization of rice bran oil extraction using response surface methodology
Autorzy:
Ahmad, S. W.
Javed, F.
Ahmad, S.
Akram, M.
Rehman, A.
Tematy:
solvent extraction
rice bran oil
response surface methodology (RSM)
central composite design (CCD)
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Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:
https://bibliotekanauki.pl/articles/778979.pdf  Link otwiera się w nowym oknie
Opis:
Use of bran oil in various edible and nonedible industries is very common. In this research work, efficient and optimized methodology for the recovery of rice bran oil has been investigated. The present statistical study includes parametric optimization, based on experimental results of rice bran oil extraction. In this study, three solvents, acetone, ethanol and solvent mixture (SM) [acetone: ethanol (1:1 v/v)] were employed in extraction investigations. Response surface methodology (RSM), an optimization technique, was exploited for this purpose. A five level central composite design (CCD) consisting four operating parameter, like temperature, stirring rate, solvent-bran ratio and contact time were examined to optimize rice bran oil extraction. Experimental results showed that oil recovery can be enhanced from 71% to 82% when temperature, solvent-bran ratio, stirring rate and contact time were kept at 55°C, 6:1, 180 rpm and 45 minutes, respectively while fixing the pH of the mixture at 7.1.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular detection and therapeutic study of Trypanosoma brucei evansi from naturally infected horses in Punjab, Pakistan
Autorzy:
Zahoor, J.
Kashif, M.
Nasir, A.
Bakhsh, M.
Qamar, M.F.
Sikandar, A.
Rehman, A.
Tematy:
equines
prevalence
Trypanosome brucei evansi
therapeutic trial
horses
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Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/16539325.pdf  Link otwiera się w nowym oknie
Opis:
Trypanosomiasis is one of the severe pathogenic infections, caused by several Trypanosoma species, affecting both animals and humans, causing substantial economic losses and severe illness. The objective of this study was to determine the molecular diagnosis and the risk factors associated with trypanosomiasis in District Jhang, Punjab, Pakistan. For this purpose, blood samples were randomly collected from 200 horses. A predesigned questionnaire was used to collect data on risk factors before the sample collection. The microscopy examination through Giemsa staining, formol gel test and PCR techniques were used to find the prevalence. The prevalence was recorded as 22.5% with microscopy examination, 21% through formol gel test and 15.5% with PCR based results. Analysis of risk factors associated with Trypanosoma brucei evansi occurrence was carried out using Chi-square test. It showed the prevalence of Trypanosoma brucei evansi was significantly (p<0.05) associated with sex, age, rearing purpose and body condition whereas non-significantly (p>0.05) with insects control practices. This study supports the idea that PCR is a sensitive, robust and more reliable technique to diagnose trypanosomiasis. It was concluded that Trypanosoma brucei evansi is widely prevalent in Jhang (Pakistan), highlighting a dire need to develop control strategies and education programmes to control this disease in developing countries.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromium(VI) uptake and resistance by P. kudriavzevii AM-4 and Candida sp. PSM-33 and their potential use in wastewater treatment plants
Autorzy:
Ilyas, Sidra
Bukhari, Dilara A.
Rehman, Abdul
Tematy:
Cr(VI)
Candida sp.
wastewater treatment plant
oczyszczalnia ścieków
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2032907.pdf  Link otwiera się w nowym oknie
Opis:
Two yeast strains already identified as Pichia kudriavzevii AM-4 and Candida sp. PSM-33 were able to resist Cr(VI) up to 400 and 350 mg/dm3, respectively. The stability and optimum temperature of chromate reductase in both yeast strains was maximal at 30 °C. Candida sp. PSM-33 showed the higher chromate reductase activity at pH 5 whereas P. kudriavzevii AM-4 exhibited maximum activity at pH 7. Both chromate reductases (ChRs) activities were enhanced in the presence of Mg, Na, Co, and Ca but strongly inhibited by Hg cations. The total cell Cr(VI) uptake capabilities were 15–68 mg/g in Candida sp. PSM-33 and 17–73 mg/g in P. kudriavzevii AM-4 within 2–12 days of growth. It was found that 23–94% of Cr(VI) reduction was achieved by P. kudriavzevii AM-4 while Candida sp. PSM-33 showed 21–88% reduction at a concentration of 100 mg/dm3. Proteins extracted from P. kudriavzevii AM-4 and Candida sp. PSM-33 followed by one-dimensional electrophoresis revealed enriched bands of low molecular-weight metallothioneins (MTs) suggesting some differential proteins could be expressed under Cr(VI) treatment. Both yeast strains can be used to ameliorate the wastewater contaminated with toxic metal ions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of zinnia seed germination and seedling emergence through magnetic seed stimulation
Wzmożenie kiełkowania nasion cynii i pojawianie się siewek poprzez magnetyczną stymulację nasion
Autorzy:
Afzal, I.
Abbasi, K.Y.
Iqbal, A.
Younis, A.
Bakhtavar, A.
Rehman, H.U.
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Powiązania:
https://bibliotekanauki.pl/articles/11543471.pdf  Link otwiera się w nowym oknie
Opis:
Poor seed germination is a main hindrance to the commercial cultivation of Zinnia (Zinnia elegans Jacq.). Seed enhancement is a useful strategy to improve germination of major agronomic and horticultural crops. A lab study was conducted to investigate the potential of magnetic seed stimulation as a seed enhancement tool and its influence on germination and emergence capacity of zinnia. Magnetic seed treatment with 50, 100 and 150 mT strength each for 5, 10 and 15 min was compared with control (untreated). Magnetic seed stimulation reduced time to 50% germination and mean germination time and increased final germination percentage, germination energy and germination index. Root length, shoot length, seedling fresh and dry weight was also increased as a result of magnetic seed stimulation. Furthermore, magnetic field treatment also enhanced α-amylase activity, total soluble sugars and reducing sugars levels. Among all seed treatments, magnetic field with strength of 100 mT for 15 min was the most effective physical treatment for improving seed germination and seedling growth of zinnia.
Słabe kiełkowanie nasion jest główną przeszkodą w komercyjnej uprawie cynii (Zinnia elegans Jacq.). Wzmocnienie nasion jest użyteczną strategią w celu poprawienia kiełkowania głównych upraw rolniczych i ogrodniczych. Doświadczenie przeprowadzono w celu zbadania potencjału magnetycznej stymulacji nasion jako narzędzia wzmocnienia nasion i jej wpływu na kiełkowanie i zdolności wschodów cynii. Z kontrolą (bez zabiegów) porównano zabiegi działania magnetycznego na nasionach z siłą 50, 100 i 150 mT przez 5, 10 i 15 min. Magnetyczna stymulacja nasion zmniejszyła do 50% czas kiełkowania i średni czas kiełkowania oraz zwiększyła ostateczny procent kiełkowania, energię kiełkowania i wskaźnik kiełkowania. W rezultacie magnetycznej stymulacji nasion zwiększyła się też długość korzenia, długość łodygi oraz świeża i sucha masa. Ponadto zabieg pola magnetycznego wzmógł aktywność α-amylazy oraz poziom całkowitej zawartości cukrów rozpuszczalnych i cukrów redukujących. Wśród wszystkich zabiegów na nasionach, pole magnetyczne o sile 100 mT działające przez 15 min było najbardziej skutecznym zabiegiem poprawiającym kiełkowanie nasion i wzrost siewek cynii.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Step Martensitic Transformation in an Aged $Ti_{50}Ni_{15}Pd_{25}Cu_{10}$ High Temperature Shape Memory Alloys
Autorzy:
Rehman, S.
Khan, M.
Nusair Khan, A.
Ali, L.
Imran Jaffery, S.
Tematy:
81.30.Kf
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1401938.pdf  Link otwiera się w nowym oknie
Opis:
Multi-step martensitic transformation in an aged Ni-rich binary NiTi shape memory alloy is considered as usual behavior during transformation from austenite to martensite phase; from (austenite) B2 to R-phase and then R-phase to B19' (monoclinic). However, for equi-atomic NiTi-based quaternary high temperature shape memory alloy, two-step martensitic transformation was detected for the first time. The $Ti_{50}Ni_{15}Pd_{25}Cu_{10}$ high temperature shape memory alloys were investigated for the evolution of transformation temperatures at aging temperature of 550°C and 700°C. Aging at 550°C for 6 h resulted in significant reduction of phase transformation temperatures. During forward transformation from austenite to martensite, two-step martensitic transformation B2 → R and R → B19 (orthorhombic) was observed. By aging the alloy at 700°C for 6 h, no significant effect was found on phase transition behavior and transformation temperatures.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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