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Preface - kmutt

Preface - kmutt

KMUTT Annual Research

KMUTT Annual Research Abstracts 2005 However, this common feeding selection of ripe fruit may leave gibbon and hornbill species as major food competitors. This role will appear of higher importance during the reproduction period, when their consequent high energy requirements overlap. Parallel detailed ecological studies on the feeding habits and reproductive strategies of white-handed gibbon and hornbill populations have been conducted at Khao Yai National Park in Thailand. Concerning gibbons, the study combined long-term demographic data from over a decade with detailed forest ecological quality variation measurements for each inhabited home range. Forest quality was measured in terms of potential food productivity by combining a food abundance index (F.A.I.). The F.A.I investigated the spatio-temporal distribution of important gibbon food resources, with a biomass coefficient quantifying fruit production on a kg per ha basis. Spatial distribution of resources was defined for 20% of each home range, while the temporal reproductive status of trees was defined for species comprising 80% of the monthly gibbon diet. Our results show a marked seasonal variation in forest food productivity, significantly corresponding with reproductive events; gibbon conception follows months of higher food productivity (from January to April, peaking in March). Synchronizing conception with periods of high food productivity is a direct consequence of the higher energetic requirements of females to achieve regular ovulation. Our combined work on female gibbon and hornbill reproductive performances revealed a high dependence on good quality resources during the conception period and nesting period for both species. These appear to strongly overlap in time: from February to April for gibbons, and from January to early June for hornbills. During this period, hornbills also rely on high quality resources to feed their developing chicks, while female gibbons need high quality items to guarantee a regular ovulatory cycle. In this presentation, we have assessed the importance of some plant species used by both animals (e.g. Polyalthia viridis). In order to assess the degree of feeding competition, we examined which plants reflect a higher cost for the different breeding animals, as well as their nutritional composition. IC-244 EFFECT OF CONTROLLED ATMOSPHERES ON BROWNING OF LONGKONG (Aglaia dookkoo GRIFF) Intira Lichanporn, Sirichai Kanlayanarat APEC Symposium on Assuring Quality and Safety of Fresh Produce, August 1-3, 2005, Radisson Hotel, Bangkok, Thailand 161 Longkong (Aglaia dookkoo Griff) is a famous tropical fruit of Southeast Asia. The fruits, a non-climacteric type, are usually harvested ripe and consequently, postharvest life is very short due to rapid peel browning. Controlled atmospheres (CA) of 2-6% O 2 and 3- 6% CO 2 or their combination remarkably inhibited peel browning during 12 day storage at 13°C, 90-95%RH. The fruits showed browning symptoms only after 6 days of storage whereas fruits stored in air, as early as after 3 days of storage. At the end of the 12 days storage period, all CA-stored fruits had browning scores of about 4 (40% browning) while those stored in air, 10 (100% browning). Weight loss, phenylalanine ammonia lyase (PAL) activity and ethylene production rate correlated well with browning development while no direct correlation was obtained for total phenolics content, respiration rate and polyphenol oxidase (PPO) activity. Weight loss of all CA-stored fruits appreciably decreased and was maintained at about lower than 4% throughout the storage period while fruits stored in air lost more lower than 2% of its after only 3 days of storage increasing to about 16% after 12 days. CAstored fruits had also consistently lower PAL activity during the first 9 days of storage, CA likewise suppressed the dramatic rise in ethylene production after 6 days of storage observed in fruits stored in air. However 2% O 2 in combination with 3-6% CO 2 caused much higher ethylene production than the other CA treatments. PPO activity was generally higher in CA-stored fruits than that of fruits stored in air. Among CA treatments, 6% CO 2 in combination with 2-6% O 2 appeared most effective in inhibiting browning but among these two treatments, the use of 2% O 2 resulted to offflavor development. IC-245 QUALITY AND SHELF LIFE OF THAI SWEET BASIL (Ocimum basilicum L.) SHOOTS PACKED IN DIFFERENT PACKAGING MATERIALS Pathompong Penchaiya, Sirichai Kanlayanarat International Conference

162 APEC Symposium on Assuring Quality and Safety of Fresh Produce, August 1-3, 2005, Radisson Hotel, Bangkok, Thailand The effects of different packages on quality and shelf life of Thai sweet basil (Ocimum basilicum L.) shoots were investigated. The shoots were packed in seven types of packages and then placed in the supermarket display refrigerated shelf with temperature controlled at 7 ± 1°C. The results showed that clam shell plastic tray prevented weight loss and deterioration in visual quality and aroma better than that of other plastic tray packages (long plastic tray and plastic tray cover with lid). Packing in plastic tray wrapped with PE film lost weight, visual quality and aroma more rapidly than wrapped with PVC film. On the other hand, Thai sweet basil shoots packed in PE and PP bag were the most efficient packages in reducing weight loss, visual quality and aroma deterioration. PP bag was more effective increasing shelf life to 14 days compared to treat with PE bag (10 days). Shelf life in PP or PE represented an increase of at least 2 times the shelf life in other types of packages (2-5 days). IC-246 EFFECTS OF HEAT TREATMENT ON ASCORBIC ACID CONTENT AND ASSOCIATED ENZYMES IN BROCCOLI DURING CHILLING STORAGE Prakaidao Yingsanga, Sirichai Kanlayanarat, Sompoch Noichinda APEC Symposium on Assuring Quality and Safety of Fresh Produce, August 1-3, 2005, Radisson Hotel, Bangkok, Thailand Broccoli (Brassica oleracea L. Italica Group) heads cv. Top Greens were dipped in 47°C water for 7 min and then stored at 20°C (non-chilling) or 4°C (chilling). Ascorbic acid content sharply decreased after 2 days of storage and remained almost unchanged thereafter. Storage at 4°C generally maintained higher ascorbic acid content than at 20°C. Heat treatment resulted to lower ascorbic acid content than the unheated control both at 20°C and 4°C. It increased ascorbate peroxidase (APX) activity, particularly at 4°C, and decreased dehydroascorbate reductase (DHAR) and monodehydroascorbate reductase (MDHAR) activities. DHAR and MDHAR decreased at a more rapid rate at 20°C than at 4°C. KMUTT Annual Research Abstracts 2005 IC-247 MICROBIOLOGICAL CHANGES AND SHELF LIFE OF FRESH-CUT VEGETABLES MIX IN MODIFIED ATMOSPHERE PACKS Wissanu Niyomlao, Chairat Techavuthiporn, Sirichai Kanlayanarat APEC Symposium on Assuring Quality and Safety of Fresh Produce, August 1-3, 2005, Radisson Hotel, Bangkok, Thailand Fresh-cut Vegetables mix (VM) consisting of carrot shreds, lettuce slices and onion dices were packed in 15 µm-thick polyvinyl chloride (PVC) or 15-25 µm-thick linear low density polyethylene (LLDPE) films. VM held in the open served as control. Storage was done at 8°C with 90-95 % relative humidity. Results show that without film packaging, the VM kept in storage for only 1 day due to rapid browning. However, microbial counts were lower and Salmonella sp. was not detected as compared to film-packed VM. Microbial population in film-packed VM generally increasing with increasing duration of storage and the increase was most rapid in 25 µm-thick LLDPE and least in 15 µm-thick PVC. Mold growth was higher than that of yeast. Among microorganisms as potential food safe hazard, higher Salmonella population was noted than that of E. coli. Plate counts of mold, yeast, E. coli and Salmonella sp. increased from about 0.5, 1.25, 0.42 and 0.5 log CFU/g at day 0 to about 2.8-3.5, 2.0-2.3, 0.7-0.9 and 3.2-3.5 log CFU/g at the end of storage. VM held in 25 µmthick LLDPE films had a shelf life of 3 days, i.e. 2 days longer than that without film pack. Shelf life further increased by one day more in 15 µmthick LLDPE or PVC films. Browning and decay limited shelf life of film-packed VM. IC-248 PHYSIOLOGICAL AND MICROBIOLOGICAL CHANGES IN FRESH- CUT GREEN PAPAYA AT LOW TEMPERATURES Chairat Techavuthiporn, Wissanu Niyomlao, Sirichai Kanlayanarat APEC Symposium on Assuring Quality and Safety of Fresh Produce, August 1-3, 2005, Radisson Hotel, Bangkok, Thailand Green papaya shreds were stored at 2, 5 or 10°C for physiological and microbiological profiling and shelf life determination. The results showed that the respiration and ethylene International Conference

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    CONTENTS Page Preface International

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    National Journals

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    54 นอยกวาแบบต

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    56 (Least Square Matching Method)

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    58 อุณหภูมิ 30 แ

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    60 สเปกตรัม จา

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    62 ขอมูลดานทร

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    64 22.8 มาตรฐานเป

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    66 2545 NJ-033 EFFECTS OF ELEVATED

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    68 เปลือกที่ม

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    70 ของการดูดซ

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    72 การสกัดดวย

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    74 collection of authentic texts th

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    76 รอยละ 32 มีสา

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    212 การสกัดสาร

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    214 ไดแก อุณหภู

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    216 โดยกลไกของ

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    218 เคลือบเมื่

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    220 สําเริง จัก

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    222 ลดเวลาตลอด

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    224 อุณหภูมิสู

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    226 NC-043 การวิเคร

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    228 เกิดพฤติกร

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    230 เดียว เพื่อ

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    232 มากนอยเพีย

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    234 หลักที่พบใ

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    236 NC-073 การออกแบ

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    238 บทความนี้น

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    240 นําเอาเวคเ

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    242 งานวิจัยนี

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    244 การอบแหงลด

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    246 แยกเฟสต่ํา

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    248 กลบ โดยเปรี

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    250 นํามาใช คือ

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    252 วิเคราะหหา

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    254 NC-123 การวิเคร

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    256 NC-129 เครื่องผ

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    258 สามารถขยาย

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    260 ครั้งที่ 43, 1-

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    262 calculated with the use of the

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    264 Version 1.3.1 และ Softwar

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    266 ขนไกได จากก

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    268 โครงสรางขอ

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    270 การปลูกพืช

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    272 ระดับพึงพอ

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    274 ของแกสโซฮอ

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    276 1) สภาพทั่วไ

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    278 อนุปริญญา แ

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    280 อาชีวศึกษา

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    282 กระทบตอคุณ

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    284 ตั้งกลไกแข

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    286 นุชจรินทร เ

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    288 โดยรวมผูบร

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    290 แนนกระแสไฟ

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    292 NC-222 ผลงานตีพ

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    294 NC-227 เตาเผาไห

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    296 จําเพาะรวม

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    298 NC-238 จลนพลศาส

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    300 ทนงเกียรติ

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    302 ดีเซลนั้นม

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    304 NC-254 การใชเทค

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    306 อาคารศูนยก

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    308 กระบวนการร

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    310 บรรยากาศขอ

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    312 metal ions on 2-AP biosyntheis

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    314 total clones while the ethanol

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    316 การประชุมท

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    318 BioThailand (The 16 th Annual M

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    320 สูงที่สุดพ

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    322 นัยสําคัญท

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    324 ความเขมขนร

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    326 ปลูกแบบพรา

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    328 นี้ทําใหทร

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    330 ดุลชาติ มาน

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    332 ไมโครเมตร ส

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    334 In this study, we collected seq

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    336 กนกรัตน นาค

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    338 การพัฒนาสื

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    340 one of the causes of difficulty

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    342 ทวีรัตน วิจ

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    344 program, Cytoscape. This model

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    346 production demand. Nevertheless

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    348 อุลตราไวโอ

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    350 นี้อยูในชว

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    352 เพื่อนําสว

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    354 trichloroacetic acid (TCA) ม

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    356 ทรัพยากรที

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    358 ในประเทศสห

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    360 8-9 ธันวาคม 2548,

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    362 ซึ่งเกิดขอ

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    364 NC-391 การวิเคร

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    366 การประชุมว

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    368 2547) พบวามหาว

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    370 กนกพร ลีลาเ

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    Authors Index

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    376 จงจิตร หิรั

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    378 ธ ธนธร ทองส

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    380 พยุงศักดิ์

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    382 วรรณพ วิเศษ

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    384 สุดารัตน จิ

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    386 อุลาวัณย กุ

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    388 138, 141, 142 Jarunya Narangaja

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    390 Panida Kongsawadworakul 191 Pan

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    392 Sorakrich Maneewan 124, 136 Sor

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    394 KMUTT Annual Research Abstracts

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