1,274 research outputs found
Identification of cardiac dysfunction using a normalized spectrum of oscillometric pulses
No full text(31(4):265-274)Genetic Studies on Grain-Length by Partitioning Method in Rice
No full text以水稻品種Mira（Pl）× Norin20（P2）之兩個親本及其Fl 與F2等四個集團為材料，探討控制水稻穀粒長之遺傳行為。經使用遺傳分析析出法分析之結果發現：兩說本穀粒長之差異係由兩對有效因子對所支配，且穀粒短者（P2）對長者（Pl）為部份顯性，兩親本Mira（Pl）及Norin 20（P2）之穀粒長基因型分別被訂為aabb 與AABB 。因子交感作用之估算結果顯示對立因子對A 對a 有高度之部份顯性；而對立因子對B 對b 亦有相當程度之部份顯性，A 因子與a 因子之置換，在不同之基因型遺傳背景下對穀粒長之效應並不盡相同；B 因子與b 因子之置換其結果亦同。因知此兩因子對非為重覆基因。綜言之，A 與a 基因對及B 與b 基因對之顯性程度視其所處遺傳背景之不同對稻穀粒長之支配而有若干不同程度之變異。
Two rice vane varieties, Mira (P1) and Norm 20 (P2) were crossed for determining the number of effective factor pairs controlling grain length. It was found by applying the partitioning method of genetic analysis that the two parents were differentiated by two effctive factor pairs. The data indicated the existence of partial phenotypic dominance for shoter length of grain (P2) over longer one (P1).
The genotypes of Mira and Norm 20 were symbolized as aabb and AABB respectively. In studing factor interactions it was found that factor A exhibited a higher degree of partial dominance over its allele a in all genotypes. However, the dominance relations between B and its allele b were not consistent for the different genotypes. In substitution of a for A, the different genotypes did not have the same effect upon grain-length as did the substitution of b for B in the corresponding genotypes It follows that these two factor pairs are not duplicates. The conclusion drawn was that the degree of dominance with .Iegard to both A and a; and B and b was dependent upon the genetic background
A hybrid three-dimensional method of solute transport in saturated groundwater with heterogeneous strata
No full text(30(3):215-218)Studies on yield potential of Tainung 67 rice - I. The performance of yield components
No full text為檢討水稻臺農67號之產量潛能，本試驗以臺南5號為對照，藉兩品種諸主要性狀之比較，以推定臺農67號高產之決定性狀。經1年兩期作之試驗調查發現：在1期作生育條件下，臺農67號較對照種臺南5號增產9.1%，其差異已達5%之顯著水準。而其高產之癥結似因臺農67號之穗數較對照種臺南5號者為多，致單株之生物產量增加而穀產量增加，而與兩品種之收穫指數無關。而在2期作環境下，臺農67號豐產之癥結如一期作者，亦奠基於該品種之多穗數。惟本期作下，臺農67號雖較對照種臺南5號增產4.2%，但兩品種單株穀產量之差異並未具統計上之意義。The recently released high yielding rice Tainung 67 is currently the most popular variety in Taiwan. In order to evaluate the yield potential of this variety, various yield components, economic yield, biological yield as well as harvest index were studied in comparison with the past high yielding variety Tainan 5.
Tainung 67 yielded 9.1% higher than that of Tainan 5 in the first crop at 5% level of significance. This was found to be due mainly to the larger mumber of panicles which lead to an increase of biological yield in Tainung 67. No difference in harvest index between Tainung 67 and Tainan 5 was observed. In the second crop, Tainung 67 gave 4.2% higher grain yield than Tainan 5; it was found to be due to the similar reason as that observed in the first crop
Relationship of grain weight variation to grain-yield and the related physiological-characteristics in rice
No full textAsterolaurins A-F, Xenicane Diterpenoids from the Taiwanese Soft Coral Asterospicularia laurae
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Electrical and Optical Properties of NiO Composite Films by Radio Frequency Magnetron Sputtering
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