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Efficient microalgae harvesting by organo-building blocks of nanoclays
Farooq, Wasif,Lee, Young-Chul,Han, Jong-In,Darpito, Cornelius Hanung,Choi, Minkee,Yang, Ji-Won The Royal Society of Chemistry 2013 Green chemistry Vol.15 No.3
<P>The synthesis of aminoclays with Mg<SUP>2+</SUP> or Fe<SUP>3+</SUP>, placed in metal centers by sol–gel reaction with 3-aminopropyltriethoxysilane (APTES) as a precursor, is demonstrated, producing –(CH<SUB>2</SUB>)<SUB>3</SUB>NH<SUB>2</SUB> organo-functional pendants which are covalent-bonding onto cationic metals. The protonated amine groups in aqueous solution lead the efficient sedimentation (harvesting) of microalgae biomass within approximately 5 min and 120 min for fresh and marine species, respectively. To our surprise, the aminoclays did not depend on microalgae species or media for microalgae harvesting. In particular, the harvesting efficiency (%) of microalgae was not decreased in a wide pH region. The harvesting mechanism can be explained by the sweep flocculation of microalgae, which is confirmed by measurement of zeta potential of aminoclay in aqueous solution where aminoclay shows a positively charged surface in a wide pH region. In order to reduce the cost of aminoclays and to make the harvesting procedures simple, the membrane process using aminoclay-coated cotton filter is introduced for the treatment of 1 L-scale microalgae stocks. It is successfully performed with three recycles using the same aminoclay-coated cotton filter after removing the harvested microalgae biomass. Conclusively, the aminoclay-based microalgae harvesting systems are a promising means of reducing the cost of downstream processes in microalgae-based biorefinery.</P> <P>Graphic Abstract</P><P>Clay-mimetic aminoclay shows excellent harvesting performance both in the bulk system as a coagulant and in the membrane process as a filter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3gc36767c'> </P>
Syed Wasif Azim 숙명여자대학교 아시아여성연구원 2021 Asian Women Vol.37 No.1
This study develops an understanding about the issue of women’s marginalization in the male dominated Pukhtun society with profound influence of clergy. It evaluates the structural components of Pukhtunwali, which is the social code of Pukhtuns; generally regarded as “Pukhtun’s way of Life,” the clergy (mullahs) and Pakistani state laws as significant sources of women’s marginalization in Pukhtun society. The study argues that Pukhtunwali and the mullahs combine to diminish the position of women in politics and decision-making processes in the society. It also critically evaluates the status of Pakistani state policies in this regard and contends that state legislation is insufficient in this context and at times even contributes to this phenomenon. The study uses the broader framework of social constructivism as its theoretical basis, unfolding the significant role of structures. Methodologically, the study is based on interviews with activists (both men and women) from Pukhtun society, member of civil society, my own observations as member of the Pukhtun ethnic group, and analysis of texts, policy documents, and other secondary sources.
Amin Mohammad Wasif,Aryan Shafiqullah,Samadi Ahmad Fahim 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.5
Environmental stresses, particularly salt stress are one of the most restricting factors of crop performance. The effects of salinity stress levels S0 (EC 1 mmho/cm), S1 (EC 10 mmho/cm), S2 (EC 15 mmho/cm), and S3 (EC 20 mmho/cm) on morphological, physiological, and biochemical parameters in two winter wheat cultivars (Lalmi-4 and Kabul-013) were investigated in this study. The results indicated that salinity negatively affects plant height, tiller number, plant biomass, and days to heading of both cultivars, with more pronounced effects on Kabul-013. The physiological and biochemical reasons for the reduction could be attributed to some extent to higher cellular membrane damage, an increased rate of lipid peroxidation, and maintaining osmoregulation in Kabul-013. Moderate and high salinities increased the leaf electrolyte leakage (EL), malondialdehyde (MDA), and leaf proline contents (LPC) in Kabul-013 as compared to Lalmi-4. With rising salt concentrations, yield and its components declined in both cultivars. However, the Lalmi-4 cultivar reveals more tolerance to salinity stress compared to the Kabul-013 cultivar, possibly by better growth performance, assembling fewer MDA and proline contents, and a lower value of leaf electrolyte leakage as well as producing more grain yield. According to the findings of this study, salt stress reduces overall wheat crop performance by modifying its physiological and biochemical pathways. Utilizing the discovery of the wheat whole genome sequence, more study is required to pinpoint the genes, metabolites, and pathways responsible for the many processes of salt tolerance in wheat. In view of the present expansion of biotechnological technology, multidisciplinary approaches to the development of salt-tolerant wheat cultivars are highly encouraged.
Azeem, Eman,Gillani, Syed Wasif,Siddiqui, Ammar,HA, Al Shammary,Poh, Vinci,Sulaiman, Syed Azhar Syed,Baig, Mirza Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.13
Breast cancer is the most common cancer among women in Malaysia. Therefore, it is highly important for the public to be educated on breast cancer and to know the steps to detect it early on. Healthcare providers are in the prime position to provide such education to the public due to their high knowledge regarding health and their roles in healthcare. The present systematic review involved studies conducted in recent years to analyze the knowledge, attitudes and behavior of Malaysian healthcare providers regarding breast cancer, in attempts to obtain an overall picture of how well equipped our healthcare providers are to provide optimal breast cancer education, and to see their perceptions and actual involvement in said education. The systematic review was conducted via a primary search of various databases and journal websites, and a secondary search of references used by eligible studies. Criteria for eligibility included being published from the year 2008 till present, being conducted in Malaysia, and being written in the English language. A total of two studies were eligible for this review. Findings show that Malaysian future and current healthcare providers have moderate knowledge on breast cancer, have a positive towards involvement of breast cancer education, but have poor actual involvement.
Diet and Colorectal Cancer Risk in Asia - a Systematic Review
Azeem, Salman,Gillani, Syed Wasif,Siddiqui, Ammar,Jandrajupalli, Suresh Babu,Poh, Vinci,Sulaiman, Syed Azhar Syed Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.13
Diet is one of the major factors that can exert a majorly influence on colorectal cancer risk. This systematic review aimed to find correlations between various diet types, food or nutrients and colorectal cancer risk among Asian populations. Search limitations include dAsian populations residing in Asia, being published from the year 2008 till present, and written in the English language. A total of 16 articles were included in this systematic review. We found that red meats, processed meats, preserved foods, saturated/animal fats, cholesterol, high sugar foods, spicy foods, tubers or refined carbohydrates have been found by most studies to have a positive association with colorectal cancer risk. Inversely, calcium/dairy foods, vitamin D, general vegetable/fruit/fiber consumption, cruciferous vegetables, soy bean/soy products, selenium, vitamins C,E and B12, lycophene, alpha-carotene, beta-carotene, folic acid and many other vitamins and minerals play a protective role against colorectal cancer risk. Associations of fish and seafood consumption with colorectal cancer risk are still inconclusive due to many varying findings, and require further more detailed studies to pinpoint the actual correlation. There is either a positive or no association for total meat consumption or white meats, however their influence is not as strong as with red and processed meats.
A New Optimized Localized Technique of CG Return Stroke Lightning Channel in Forest
Homayun Kabir,Jeevan Kanesan,Ahmed Wasif Reza,Harikrishnan Ramiah,Kaharudin Dimyati 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
Localization of lightning strike point (LSP) in the forest is modeled to mitigate the forest fire damage. Though forest fire ignited by lightning rarely happens, its damage on the forest is grievousness. Therefore, predicting accurate location of LSP becomes crucial in order to control the forest fire. In this paper, we proposed a new hybrid localization algorithm by combining the received signal strength (RSS) and the received signal strength ratio (RSSR) to improve the accuracy by mitigating the environmental effect of lightning strike location in the forest. The proposed hybrid algorithm employs antenna theory (AT) model of cloud-to-ground (CG) return stroke lightning channel to forecast the location of the lightning strike. The obtained results show that the proposed hybrid algorithm achieves better location accuracy compared to the existing RSS method for predicting the lightning strike location considering additive white Gaussian noise (AWGN) environment.