Browsing by Author "Faculty of Science"

FeCI3 6H2O catalyzed three components aza-Friedel-Crafts reaction for the synthesis of N-Boc protected a-branched amines

Jaray Jaratjaroonphong; Sureeporn Ruengsangtongkul (2014)

ในงานวิจัยนี้พบว่าสาร FeCl3•6H2O เป็นตัวเร่งปฏิกิริยาที่มีประสิทธิภาพในปฏิกิริยา aza-Friedel-Crafts ของสารตั้งต้น สามองค์ประกอบคือ arenes หรือ heteroarenes, tert-butyl carbamate และ aromatic aldehydes ภายใต้สภาวะที่ไม่รุ ...

Fish Assemblages and Habitat in a Malaysian Blackwater Peat Swamp

F. William H. Beamish; Robert B. Beamish; Lee-Hong Susan Lim (2003)

Fish captured by electrofishing from lotic reaches within and immediately outside the North Selangor blackwater peat swamp forest were placed into six assemblages. Species richness varied among assemblages from 7 to 32 but ...

Functional properties of cellulose powder prepared from rice straw.

Arpathsra Sangnark; Kullaya Limroongreungrat; Chokchai Ton (2005)

Multi-hydrogen peroxide process can improve all physical properties of rice straw. Rice straw quantity of 0.2% (w/v) provided maximum values of cellulose content, brightness, water holding capacity, and oil-binding capacity ...

Gene expression of acetylcholinesterase in hybrid catfish (Clarias gariepinus X Clarias macrocephalus) exposed to chlorpyrifos and carbaryl.

Chuta Boonphakdee; Voravit Cheevaporn; Faculty of Science; Chawanrat Somnuek; Keiichi Tanaka (2009)

After serving as a neurotransmitter, acetylcholine is hydrolyzed by acetylcholinesterase (AChE). Inhibition of AChE is considered to be a specific biomarker for exposure to organophosphate and carbamate insecticides. In ...

Habitat and abundance of Balitoridae in small rivers of central Thailand

Voravit Cheevaporn; F. William H. Beamish; Phannee Sa-ardrit (2008)

Balitorids were collected, by electrofishing, from small rivers across central Thailand between October 2000 and March 2004. Total balitorid abundance for the 18 species averaged 3·8% of the cumulative total for all fishes. ...

Habitat Characteristics of the Cyprinidae in Small Rivers in Central Thailand

F. William H. Beamish; Phannee Sa-ardrit; Sampan Tongnunui (2006)

Cyprinids were sampled, by electrofishing, from 159 sites on small rivers in four major watersheds across central Thailand. Total abundance, estimated by the depletion method, varied directly with water velocity and, ...

Heavy Metals in wild Banana Prawn (Fenneropenaeus Merguiensis De Man, 1888) from Chantaburi and Trat Provinces, Thailand

Suwanna Panutrakul.; Nongnud Tangkrock-olan; Wansuk Senanan; Sirikul Khamdech; Phacharakon Kerdthong; Acacia Alcivar- Warren (2007)

Concentrations of the heavy metals cadmium (Cd), mercury (Hg), nickel (Ni), lead (Pb), chromium (Cr), copper (Cu) and zinc (Zn) in adult banana prawns (Fenneropenaeus merguiensis de Man, 1888) were determined. Banana prawn ...

Influence of fineness of rice husk ash and additives on the properties of lightweight aggregate

Ubolluk Rattanasak; Parinya Chindaprasirt; Chai Jaturapitakkul (2009)

In this paper, the preparation of lightweight aggregate (LWA) from rice husk ash (RHA) obtained from a biomass power plant was studied. As-received and ground RHAs were mixed with sodium hydroxide solution (NaOH) and cured ...

Influence of NaOH solution on the synthesis of fly ash geopolymer

Prinya Chindaprasirt; Ubolluk Rattanasak (2009)

A study was conducted on leaching of fly ash mixed with NaOH solution and on mixing procedure for preparing geopolymer. Leaching of SiO2 and Al2O3 was investigated by mixing fly ash with NaOH solution for different time ...

Isomers of various species of 1-hydroxy-2-pyridinone-6-carboxylic acid, their proton dissociation and complexes with Cr(III) and Zn(II)

Khajadpai Thipyapong; Vithaya Ruangpornvisuti (2008)

Isomers of 1-hydroxy-2-pyridinone-6-carboxylic acid (6-carboxy-1,2-HOPO), their deprotonated species and complexes with chromium and zinc were theoretically investigated by density functional theory calculations. Free ...

Microbial Flora of Spermatophores from Black Tiger Shrimp (Penaeus monodon) Declines Over Long-Term Cryostorage

Subuntith Nimrat; Verapong Vuthiphandchai; Amrit N. Bart; Aritsara Keatsaksit (2008)

Microbial contamination in sperm banks is of concern to sperm bank managers to prevent the perceived risk of disease transmission during cryostorage. The objective of this study was to examine the bacterial profile of ...

Morphological inhibition of calcium oxalate monohydrate by osteopontin

Katavut Pachana; Amnuay Wattanakornsiri (2010)

Calcium oxalate (CaOx) can be crystallized in several forms and morphologies. CaOx plays a functional role in plant physiology and is a source of chronic human disease called kidney stone, being primarily composed of calcium ...

On Approximating a Generalized Binomial by Binomial and Poisson Distributions

Kanint Teerapabolarn; Patcharee Wongkasem; Renumas Gulasirima (2008)

The aim of this paper is to approximate a generalized binomial distribution by binomial and Poisson distributions. Using the ω-function and the two Stein identities, the main result of each approximation in terms of the ...

On the Geometric Approximation to the Pólya Distribution

คณินทร์ ธีรภาพโอฬาร; Kanint Teerapabolarn (2008)

This paper gives a new upper bound on the geometric approximation to the Pólya distribution using the w-function and the Stein identity.

On the Negative Binomial Approximation to the Beta-Negative Binomial Distribution

Kanint Teerapabolarn (2008)

The w-function and the Stein identity are adapted and applied to determine an upper bound for the total variation distance between beta-negative binomial and negative binomial distributions.

Optimum Conditions and Kinetics of Enzymatic Hydrolysis of Cassava Starch from Flour and Root Chip Powder for Further Studies at the Large-Scale

Saethawat Chamsart; Chaweewon Sawangwon; Sirichom Thungkao; Yoawapha Waiprib (Faculty of Science, 2549)

The production of sugar solution i.e. glucose syrup and other related products from hydrolysis of starch is one of the most popular methods. For the efficient use of enzymes in order to obtain maximum product yield, at a ...

PCR-RFLP analysis of mitochondrial DNA to differentiate populations of climbing perch (Anabas testudineus) in Thailand

Wansuk Senanan; Syarif Hidayat (2010)

Climbing perch (Anabas testudineus) is a common tropical fresh- and brackish water fish species in Asia. Its aquaculture has received attention in many Asian countries both as an emerging economic species and affordable protein ...

Physical properties of thermoplastic glutinous rice starch reinforced with recycled newspaper cellulose fibers

Supranee Kaewpirom; Katavut Pachana; Amnuay Wattanakornsiri (2012)

Biocomposites have resulted in a renewed interest in environmentally friendly materials for biodegradable renewable resource. In this work, cellulose fibers extracted from recycled newspaper were used as reinforcement for ...

Poisson Approximation for Independent Geometric Random Variables

Kanint Teerapabolarn; Patcharee Wongkasem (2007)

The Stein-Chen method is used to derive two formulas of uniform and non-uniform bounds on Poisson approximation for a sum of n independent geometric random variables. Application of these formulas is illustrated with the ...

Poisson Approximation to the Beta-Negative Binomial Distribution

Kanint Teerapabolarn (2008)

The w-function and the Stein-Chen identity are used to determine two formulas of uniform and non-uniform upper bounds on Poisson approximation to the beta-negative binomial distribution.

Browsing by Author "Faculty of Science"

Browsing by Author "Faculty of Science"

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