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Direct capture and separation of CO_(2) from air

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Green Energy & Environment 2024年第3期9卷 413-416页

作者： Siew Ping teong Yugen Zhang Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)1 Pesek Road Jurong Island627833SingaporeRepublic of Singapore

Direct air capture(DAC)has attracted increasing interest and investment over the past few *** are a fast-growing number of companies that entered the field and demonstrated DAC carbon removal setups and ***,current DAC methods are still based on solid absorbents or alkali solutions approaches which have low capture efficiency and low energy *** highlight proposed a promising CO_(2) capture technology,an electric energy driven closed-loop system for the direct removal of CO_(2) from ambient air which are based on two individual technologies:Polyam-N-Cu hybrid system promoted CO_(2) capture with ocean as anthropogenic CO_(2) sink and a chloride-mediated electrochemical pH swing system to remove CO_(2) from oceanwater.

关键词： system separation companies

Design and 3D Printing of Scaffolds and Tissues

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Engineering 2015年第2期1卷 261-268页

作者： Jia An Joanne Ee Mei teoh Ratima Suntornnond Chee Kai Chua Singapore Centre for 3D Printing School of Mechanical and Aerospace Engineering Nanyang Technological University

A growing number of three-dimensional(3D)-print- ing processes have been applied to tissue engineering. This paper presents a state-of-the-art study of 3D-printing technologies for tissue-engineering applications, with particular focus on the development of a computer-aided scaffold design system; the direct 3D printing of functionally graded scaffolds; the modeling of selective laser sintering(SLS) and fused deposition modeling(FDM) processes; the indirect additive manufacturing of scaffolds, with both micro and macro features; the development of a bioreactor; and 3D/4D bioprinting. Technological limitations will be discussed so as to highlight the possibility of future improvements for new 3D-printing methodologies for tissue engineering.

关键词： rapid prototyping 3D printing additive manufacturing tissue engineering bioprinting

ATP translocation and chloroplast biology

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National Science Review 2019年第6期6卷 1073-1076页

作者： Chia P.Voon boon L.Lim School of Biological Sciences University of Hong Kong

By studying changes in ATP levels in the plastids and cytosol of live plants using a Mg ATP2-specific F?rster resonance energy transfer（FRET）-based sensor, the entry of cytosolic ATP to the mature chloroplasts of Ar... 详细信息

关键词： ATP translocation and chloroplast biology

Long noncoding RNA in cardiac aging and disease

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Journal of Molecular Cell Biology 2019年第10期11卷 860-867页

作者： Noelia Lozano-Vidal Diewertje IBink Reinier A.boon Department of Physiology Amsterdam Cardiovascular SciencesAmsterdam Universitair Medische CentraVrije Universiteit Amsterdam1081 HZAmsterdamthe Netherlands Institute of Cardiovascular Regeneration Goethe UniversityFrankfurt am MainGermany German Center for Cardiovascular Research(DZHK) Partner Site Rhein-MainBerlinGermany

Cardiovascular diseases(CVDs)are the main cause of morbidity and mortality in Western society and present an important agerelated *** the constant rise in life expectancy,prevalence ofCVD in the population will likely increase *** therapies,especially in the elderly,are needed to combat *** review is focused on the role of long noncoding RNA(IncRNA)in *** sequencing experiments in the past decade showed that most RNA does not code for protein,but many RNAs function as ***,we summarize the recent findings of IncRNA regulation in the diseased *** potential use of these RNAs as biomarkers of cardiac disease prediction is also discussed.

关键词： long non coding RNA aging cardiovascular disease

Acid Blue 25 adsorption on base treated Shorea dasyphylla sawdust:Kinetic,isotherm,thermodynamic and spectroscopic analysis

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Journal of Environmental Sciences 2012年第2期24卷 261-268页

作者： Megat Ahmad Kamal Megat Hanafiah Wan Saime Wan Ngah Shahira Hilwani Zolkafly Lee Ching teong Zafri Azran Abdul Majid Department of Chemistry Faculty of Applied SciencesUniversiti Teknologi MARA School of Chemical Sciences Universiti Sains Malaysia Kulliyyah of Allied Health Sciences International Islamic University Malaysia

The potential of base treated Shorea dasyphylla（BTSD） sawdust for Acid Blue 25（AB 25） adsorption was investigated in a batch adsorption *** physiochemical parameters such as pH,stirring rate,dosage,concentration,contact time and temperature were *** adsorbent was characterized with Fourier transform infrared spectrophotometer,scanning electron microscope and Brunauer,Emmett and Teller *** optimum conditions for AB 25 adsorption were pH 2,stirring rate 500 r/min,adsorbent dosage 0.10 g and contact time 60 *** pseudo second-order model showed the best conformity to the kinetic *** equilibrium adsorption of AB 25 was described by Freundlich and Langmuir,with the latter found to agree well with the isotherm *** maximum monolayer adsorption capacity of BTSD was 24.39 mg/g at 300 K,estimated from the Langmuir *** parameters such as Gibbs free energy,enthalpy and entropy were *** was found that AB 25 adsorption was spontaneous and exothermic.

关键词： Acid Blue 25 adsorption Shorea dasyphylla sawdust spectroscopy thermodynamic

Clinical characteristics predicting erythema nodosum leprosum(ENL) among patients with multibacillary leprosy(MBL) in Sarawak

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Asian Pacific Journal of Tropical Medicine 2009年第5期2卷 66-70页

作者： Yap Felix boon Bin Department of Dermatology Sarawak General HospitalJalan Hospital93586 KuchingSarawakMalaysia

Objective:To determine the clinical features predicting erythema nodosum leprosum(ENL) in a non endemic leprosy ***:Twenty newly diagnosed patients with MBL attending the skin clinic,Sarawak General Hospital from 1992 to 2007 were *** were divided into 2 groups,one with ENL and one without. Analysis of the presenting clinical features was done to determine the risk factors for *** square and student t test was used for statistical *** of significance was set at ***:ENL was present in 40%patients,all with lepromatous leprosy(LL).Clinical features that were seen more frequently in patients developing ENL include earlobe thickening(100%cf.25%,P =0.00),loss of the lateral third of the eyebrows(75%cf.16.7%,P=0.02) and mean bacteriology index(BI)(5.1 cf.2.9,P=0.03) and mean morphological index(MI)(17.8 cf.7.0,P =0.02).Number of thickened nerves(mean 2.5 cf. 1.4,P = 0.12),number of skin lesions(mean 19.4 cf.10.9,P = 0.15) and duration of illness(mean 15. 3 cf.12.8 months,P =0.68) did not predict ENL ***:Finding LL patients with thickened earlobes,loss of lateral third of the eyebrow,high BI and MI should alert treating clinician to the possibility of ENL in a non endemic leprosy area.

关键词： Leprosy Erythema nodosum leprosum(ENL) Multibacillary leprosy

Laser sintering of Cu nanoparticles on PET polymer substrate for printed electronics at different wavelengths and process conditions

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Frontiers of Mechanical Engineering 2020年第2期15卷 303-318页

作者： Juan Carlos HERNANDEZ-CASTANEDA boon Keng LOK Hongyu ZHENG Singapore Institute of Manufacturing Technology Singapore 138634Singapore School of Mechanical Engineering Shandong University of TechnologyZibo 255049China

This study explores the feasibility of different laser systems to sinter screen-printed lines from nonconductive copper nanoparticles(Cu NPs)on polyethylene terephthalate polymer *** materials are commonly used in manufacturing functional printed electronics for large-area ***,optical and thermal characterization of the materials is conducted to identify suitable laser sources and process *** diode(808 nm),Nd:YAG(1064 nm and second harmonic of 532 nm),and ytterbium fiber(1070 nm)lasers are *** parameters for sintering the Cu NPs are identified for each laser system,which targets low resistivity and high processing ***,the quality of the sintered tracks is quantified,and the laser sintering mechanisms observed under different wavelengths are *** considerations are discussed to improve the laser sintering process of Cu NPs.

关键词： laser sintering copper nanoparticles printed electronics

Chlorella across latitudes: investigating biochemical composition and antioxidant activities for biotechnological applications

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Advances in Polar Science 2023年第4期34卷 340-351页

作者： Chloe Zi-En WONG Ming-Li teoh Sook Wah CHAN Nallammai SINGARAM Wendy Ming-Yen teoh John BEARDALL School of Biosciences Faculty of Health and Medical SciencesTaylor’s UniversitySubang Jaya 47500Malaysia Clean Technology Impact Lab Taylor’s UniversitySubang Jaya 47500Malaysia Food Security&Nutrition Impact Lab Taylor’s UniversitySubang Jaya 47500Malaysia Institute of Technology Management and Entrepreneurship Universiti Teknikal Malaysia Melaka(UTeM)Durian Tunggal 76100Malaysia School of Biological Sciences Monash UniversityClayton VIC 3800Australia

With the present day rise of interest in acquiring sustainability in the pharmaceutical industry,there has been an emphasis on finding natural resources to replace the use of synthetic compounds used in *** have garnered significant attention owing to their natural and sustainable capability to produce a diverse array of bioactive ***,this study aims to evaluate the biochemical composition and antioxidant properties of Chlorella strains from a tropical region(Chlorella UMACC 051 and Chlorella UMACC 038)and a polar region(Chlorella UMACC 250 and Chlorella UMACC 234).The cultures were grown for 10 *** the end of the experiment,the specific growth rate,chlorophyll-a content,carotenoid content,biomass,and biochemical composition such as carbohydrate,protein and lipid content were *** addition,the phytochemical properties were determined using a total phenolic assay while the antioxidant activities were determined using 2,2-diphenyl-1-picrylhydrazyl(DPPH).Of all Chlorella strains tested,the tropical Chlorella UMACC 051 showed the fastest growth rate and biomass while the polar Chlorella UMACC 234 contained the highest pigment content and tropical Chlorella UMACC 038 has the highest total phenolic *** biochemical composition analysis showed all strains have a high lipid content ranging from 45.36%to 60.30%dry *** Chlorella strains exhibited a small amount of antioxidant activity(15.42%to 30.15%)and total phenolic content ranging from 1.91±0.04 to 4.43±0.10 mg GAE·g–1 dry *** results indicated that polar Chlorella UMACC 234 has the most potential in containing significant amounts of bioactive compounds.

关键词： Chlorella polar tropical biochemical composition total phenolic content DPPH

Effects of temperature and solvent concentration on the solvent crystallization of palm-based dihydroxystearic acid with isopropyl alcohol

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Particuology 2012年第1期10卷 127-131页

作者： Gregory F.L. Koay teong-Guan Chuah Sumaiya Zainal-Abidin Salmiah Ahmad Thomas S.Y. Choong Department of Chemical and Environmental Engineering Universiti Putra Malaysia Advanced Oleochemical Technology Division Malaysian Palm Oil Board Institute of Tropical Forestry and Forest Products Universiti Putra Malaysia Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Director General's Office Malaysian Rubber Board

Palm-based dihydroxystearic acid of 69.55% purity was produced in a 500-kg-per-batch operation pilot plant and purified through solvent crystallization in a custom fabricated simultaneous batch crystallizer unit. The effects of temperature and solvent concentration on yield, particle size distribution and purity were studied. The purity was higher, while the yield and particle size were lower and smaller, respectively, at higher temperature and solvent concentration. The solvent crystallization process efficiency was rated at 66-69% when carried out with 70-80% isopropyl alcohol at 20℃.

关键词： Dihydroxystearic acidPilot plant operationSolvent crystallizationSimultaneous batch crystallizerProcess efficiency