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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study of Dropping Speed in Eggs of Oncomelania hupensis, a Snail Intermediate Host of Schistosomiasis) ผู้เขียน: Xingjian Xu, Xianxiang Yang, Xiapin Li, Wei Zhang, Qingsang Pan, Zhengan Xiong สื่อสิ่งพิมพ์:pdf AbstractOncomelana hupensis (Gredler, 1881) is an intermediate host of Schistosomiasis japonica in China. In order to understand the factors controlling sedimentation and drifting of adult snails and snail eggs in rivers, three aspects were investigated by experiment. Firstly, the specific gravity of the snail eggs which was found to be 2.29 g/cm3 ; secondly, the range of dropping speed of the snail eggs through a water column which was found to be 1.19 to 3.77 cm/s; thirdly, a formula to determine dropping speed of the eggs was established. The formula was statistically validated by comparison with observed values. The results are relevant to both the development and design of irrigation schemes, and also to river management, where dispersal of snails and their eggs needs to be controlled. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Relationship between Environmental Factors during the Rainy Season and Un-opened Floret Yellowing in Dendrobium Sonia ‘Ear-Sakul’) ผู้เขียน:Vimolchat SARNTINORANONT,  ดร.สุรวิช วรรณไกรโรจน์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe pre-harvest yellowing in the un-opened florets of Dendrobium Sonia ‘Ear-Sakul’ grown under 50% shade in a saran-house was studied. In the rainy season, the most sensitive period for yellowing in un-opened florets was found to be the ready-to-bloom stage. The highest percentage of inflorescence with un-opened floret yellowing was obtained from those with no open florets. The percentage of inflorescence with yellowed un-opened florets could be predicted (R2= 0.613) using an environmental model consisting of: 1) cumulative hours of daytime with 0 ?mol m-2s-1 light intensity; 2) average rainfall during 1000-1400 hours; 3) cumulative hours of daytime with the temperature less than 25?C; and 4) cumulative hours when the relative humidity (RH) was in the range 75-90% in the period 3 d before un-opened floret yellowing. The developmental stage of inflorescence did not affect un-opened floret yellowing. The simulated stress environment of the rainy season had no effect on the sucrose, glucose and fructose contents in the first- and second-largest un-opened florets, nor on the calcium and boron contents in the inflorescence and leaves. Under the simulated stress environment of the rainy season in a growth chamber, spraying 1% sucrose solution might be useful to reduce yellowing in un-opened florets. |
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Researcherดร. สุรวิช วรรณไกรโรจน์, รองศาสตราจารย์ที่ทำงาน:ภาควิชาพืชสวน คณะเกษตร สาขาที่สนใจ:การเพาะเลี้ยงเนื้อเยื่อ, การปรับปรุงพันธุ์พืชและเทคโนโลยีชีวภาพ กล้วยไม้ ไม้ประดับเขตร้อนชื้น, กฎหมายคุ้มครองพันธุ์พืช, ความหลากหลายทางชีวภาพ, ความปลอดภัยทางชีวภาพ Resume |