排序方式: 共有9条查询结果,搜索用时 31 毫秒
1
1.
Flavonoids are secondary metabolites synthesized by plants shown to exhibit health benefits such as anti-inflammatory, antioxidant,
and anti-tumor effects. Thus, due to the importance of this compound, several enzymes involved in the flavonoid pathway have
been cloned and characterized in Escherichia coli. However, the formation of inclusion bodies has become a major disadvantage of this approach. As an alternative, chalcone
synthase from Physcomitrella patens was secreted into the medium using a bacteriocin release protein expression vector. Secretion of P. patens chalcone synthase into the culture media was achieved by co-expression with a psW1 plasmid encoding bacteriocin release protein
in E. coli Tuner (DE3) plysS. The optimized conditions, which include the incubation of cells for 20 h with 40 ng/ml mitomycin C at
OD600 induction time of 0.5 was found to be the best condition for chalcone synthase secretion. 相似文献
2.
Izzati Husna Ismail Kamarulazizi Ibrahim Melati Khairuddean Tho Seiw Yen Yeap Choon Wan 《Journal of Sol-Gel Science and Technology》2014,72(2):369-374
In this study, zinc oxide (ZnO) nanorod were successfully prepared at different growth times (15, 30 and 60 min) using the microwave irradiation method. The ZnO nanorods were simply synthesized at a low temperature (90 °C) with low power microwave assisted heating (about 100 W) and a subsequent ageing process. The synthesized nanorod were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and Ultraviolet–Visible spectroscopy (UV–Vis). The FESEM images showed nanorods with diameter ranging between 50 and 150 nm, and length of 150–550 nm. The XRD results indicate that ZnO nanorods of different time of growth exhibits pure wurtzite structure with lattice parameters of 3.2568 and 5.2125 Å. UV–Vis characterization showed that energy gap decreases with increase in time. The result also shows that growth of ZnO at 60 min produces an energy band gap of 3.15 eV. In general, the results of the study confirm that the microwave irradiation method is a promising low temperature, cheap and fast method for the production of ZnO nanostructures. 相似文献
3.
Nur Izzati Ishak S V Muniandy Vengadesh Periasamy Fong-Lee Ng Siew-Moi Phang 《中国物理 B》2017,26(8):88203-088203
In this work, we study the regional dependence of transport behavior of microalgae Chlorella vulgaris inside microfluidic channel on applied fluid flow rate. The microalgae are treated as spherical naturally buoyant particles. Deviation from the normal diffusion or Brownian transport is characterized based on the scaling behavior of the mean square displacement(MSD) of the particle trajectories by resolving the displacements in the streamwise(flow) and perpendicular directions.The channel is divided into three different flow regions, namely center region of the channel and two near-wall boundaries and the particle motions are analyzed at different flow rates. We use the scaled Brownian motion to model the transitional characteristics in the scaling behavior of the MSDs. We find that there exist anisotropic anomalous transports in all the three flow regions with mixed sub-diffusive, normal and super-diffusive behavior in both longitudinal and transverse directions. 相似文献
4.
5.
6.
Based on presently available experimental advancements, we present a theoretical technique to generate single-mode electromagnetic-field
entangled NOON states between two resonators. A two-level atom interacts dispersively with a standing wave field, which results
in Bragg diffraction and thus a superposition of atomic external degrees of freedom. Later, a resonant interaction of the
atom with two different resonators in the presence of a Ramsey field and a Stark field entangles the two resonators in their
NOON state. We further discuss the experimental parameters necessary to realize the scheme in the laboratory and calculate
the corresponding success probability. 相似文献
7.
Saiful Izwan Abd Razak Farah Nuruljannah Dahli Izzati Fatimah Wahab Mohammed Rafiq Abdul Kadir Ida Idayu Muhamad Abdul Halim Mohd Yusof 《Soft Materials》2016,14(2):78-86
This paper reports for the first time a simple yet effective method for fabricating a conductive and highly porous scaffold material made up of polylactic acid (PLA) and conducting polyaniline (PANI). The electrical percolation state was successfully obtained at 3 wt% of PANI inclusions and reached a conductivity level of useable tissue engineering applications at 4 wt%. In addition, preliminary bioactivity test results indicated that the protonating agent could form a chelate at the scaffold surface leading to good in-vitro apatite forming ability during biomimetic immersion. This new conductive scaffold has potential as a suitable biomedical material that requires electrical conductivity. 相似文献
8.
Mohamed Rizk Nashaat A. Zakhari Fauzia Ibrahim Mohamed I. Walash 《Mikrochimica acta》1989,97(5-6):355-363
A specific Spectrophotometric titration method is described for the micro-determination of some phenothiazine derivatives in strong orthophosphoric acid medium using the -acceptor 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as a mild oxidizing titrant. The wavelengths of maximum absorption of the formed phenothiazonium cation radicals are 500, 515, 530, 533 and 650 nm for trifluoperazine dihydrochloride, promethazine hydrochloride, prochlorperazine dimaleate, chlorpromazine hydrochloride and thiethylperazine dihydrochloride, respectively. Quantitative recoveries are reported for pure drugs and their dosage forms. The method is simple and specific for determining phenothiazine derivatives in presence of their induced degraded oxidation products. 相似文献
9.
Fauzia Izzati Mega Ferdina Warsito Asep Bayu Anggia Prasetyoputri Akhirta Atikana Linda Sukmarini Siti Irma Rahmawati Masteria Yunovilsa Putra 《Molecules (Basel, Switzerland)》2021,26(7)
Marine invertebrates have been reported to be an excellent resource of many novel bioactive compounds. Studies reported that Indonesia has remarkable yet underexplored marine natural products, with a high chemical diversity and a broad spectrum of biological activities. This review discusses recent updates on the exploration of marine natural products from Indonesian marine invertebrates (i.e., sponges, tunicates, and soft corals) throughout 2007–2020. This paper summarizes the structural diversity and biological function of the bioactive compounds isolated from Indonesian marine invertebrates as antimicrobial, antifungal, anticancer, and antiviral, while also presenting the opportunity for further investigation of novel compounds derived from Indonesian marine invertebrates. 相似文献
1