DSpace collection: 20期 (1994)

Approaches to Varieties and Novelties In English Teaching and Learning

Wed, 10 Nov 2010 10:36:50 GMT

title: Approaches to Varieties and Novelties In English Teaching and Learning abstract: 本文之墓底再說明如何成功的運用課本及作業以外之英語教學活動於課堂上，尤其在提升學生的學習興趣，改變上課得氣氛以及增進學生對英文學習的注意力方面。十五項活動被選用來印證教學內容多變化及新奇之功效，而如何達到此目標之運用方式也有詳細的資料。這十五項英文教學活動包括：(1)諺語，俚語或成語(2)猜謎，鬥智或趣味問答(3)笑話，謬司或新點子(4)爵士調(5)繞口令及童謠(6)英文歌曲(7)預言命性(8)廣告(9)美國節目習俗(10)說故事(11)圖片，漫畫或卡通(12)頭條新聞(13)情境會話及話劇(14)體操運動(15)知心卡。這些動可在上任何時間穿插使用，而且不僅適用國高中高職，也適用於五專及二專學生。教師在課前必須先收集資料，作好上課教學計畫，如此才能讓學生在活動中出奇不意的收到學習效果並專心學習。

A formal Synthesis of d,l-Verbenalol

Wed, 10 Nov 2010 10:25:47 GMT

title: A formal Synthesis of d,l-Verbenalol abstract: The verbenalol precursor 8, tricyclic dienelactone, can be efficiently prepared from dicyclopentadiene. The key steps include iodolactionization, decarboxylation, and dehydroiodonation.

Genetic Engineering of Bacterial Cells by Electroporation

Wed, 10 Nov 2010 10:25:45 GMT

title: Genetic Engineering of Bacterial Cells by Electroporation abstract: The intrduction of DNA into bacteria is an essential step in the construction of recombinant strains. Recently, electroporation has revolutionized the transformation of bacteria. Electroporation involves the application of brief high voltage electric discharges to reversibly permeabilize bacterial cells facilitating uptake of DNA. Electroporation is relatively simple and fast. It is frequently the best choice for transferring DNA molecules into bacterial cells.

The Effect of Lactobacillus Strains in Milk on Lactose Utilization

Wed, 10 Nov 2010 10:25:42 GMT

title: The Effect of Lactobacillus Strains in Milk on Lactose Utilization abstract: Four lactobacilli-containing milks and a control were fed to 12 lactose maldigesters in a random, blinded protocol. Milks contained 108 cfu/ml of either Lactobacillus acidophilus LA-1 or Lactobacillus gasseri ADH prepared with commercially obtained frozen or freshly grown cultures.Breath hydrogen (H2) production and symptoms were monitored to evaluate lactose digesion and tolerance. Total H2 production was modestly reduced following consumption of the lactobacilli milks, but the differences failed to reach significance (P=0.07 for LA-1 and P=0.36 for ADH). All subjects reported less severe symptoms, primarily flatulence (P=0.06), following consumption of lactobcilli milk. Frozen cultures of LA-1 exhibited a 70-fold higher β-galactosidase (β-gal) activity (per cfu) than frozen ADH. Cell counts were 10 fold higher with LA-1 than with ADH, when grown in vitro in modified MRS media. β-gal activities of lactobacilli grown in MRS with only lactose were 4-to 11-fold above enzyme activities in MRS with hoth glucose and lactoe. The results demonstrate that different levels of β-gal in Lactobacilli-containing milks may produce similar improvements in lactose digestion and tolerance. It is likely that β-gal activity is a necessary, but not sufficient attribute for optimizing lactobacilli enhancement of in vivo lactose digestion.