查询词典 birch bark

We found that birch bark could serve as paper .

我们发现桦树皮可以作纸用。

In the white part of birch bark there are other medical substances: betulinic acid, b - sitosterol, flavonoids, lupeleol and other.

在白桦树皮还有部分医疗药物：桦木酸、乙-谷甾醇、黄酮类、lupeleol等。

Summertime, oh summertime, pattern of life indelible, the fade proof lake, the woods unshatterable, the pasture with the sweet fern and the juniper forever and ever, summer without end; this was the background, and the life along the shore was the design, the cottages with their innocent and tranquil design, their tiny docks with the flagpole and the American flag floating against the white clouds in the blue sky, the little paths over the roots of the trees leading from camp to camp and the paths leading back to the outhouses and the can of lime for sprinkling, and at the souvenir counters at the store the miniature birch-bark canoes and the post cards that showed things looking a little better than they looked.

我一个劲儿地回忆着这往昔的一切。那些岁月，那些夏日，对于我是无限的珍贵，值得永远珍藏心底。那是充满欢乐、宁静和美好的时光。八月初的到达本身就是桩了不得的事儿。农场的马车在火车站刚停下，你就闻到了空气中厚重的松树味儿；你第一次瞥见了笑容满面的庄稼人。车上的行李箱是那么重要，是少不得的。父亲在所有这些事儿上有着绝对的权威。马车在你身底下颠颠晃晃十几英里的感受，是多么令人激动！在最后一座长长的山脊上，你一眼望见了离别十一个月的湖，望见了你梦牵魂绕的那泓湖水。

They instructed the new－comers in their agriculture and woodcraft,introduced them to maize,beans,squash,maple sugar,snowshoes,toboggans,and birch bark canoes.

他们对这些新来的人在农业耕作和森林环境知识方面加以指导，教他们认识玉蜀黍、豆子、西葫芦、槭糖、雪地鞋、长雪橇和桦树皮独木舟。

To harmful microflora white part of birch bark is obliged precisely to betulin.

稳定有害菌群白桦树皮部分恰恰有义务为桦木醇。

The current developments were summarized and the research contents of this thesis were described.In the second chapter, a simple procedure is described for the simultaneous extraction and determination of betulin and betulinic acid in white birch bark. To compare extraction efficiency, effect of white birch bark growing in different locations and different extract solvents on the content of betulin and betulinic acid were evaluated.

第二章建立了一种简单、准确度、灵敏度高和重现性好的RP-HPLC同时测定白桦树皮中白桦酯醇和白桦酯酸含量的方法，并用这种方法研究了提取溶剂以及产地对树皮中白桦酯醇和白桦酯酸的含量影响，确定了最佳的提取工艺。

And a birch bark compound, betulinic acid, is being tested as a treatment for melanoma and other serious diseases.

一、桦树皮大院桦木酸，正测试作为治疗黑素瘤和其他严重疾病。

Betulin, a naturally occurring triterpene, available in abundance up to 10% dry weight of bark from white birch bark, seems to be an ideal starting material for the synthesis of betulinic acid.During a discovery effort from natural resources, in order to seek new biologically active compounds, reaearch on chemical modifications of valuable precursors have been demonstrated to be an effective path to resolve the water solubility problem and increase bioavailability.

从自然界寻找先导活性化合物，再进行结构修饰，试图提高其活性，降低其毒副作用，并提高其水溶性，是创新药物的一条重要思路，而且在新药研制中也得到了很好的应用并取得了显著的成绩。

I would put them there and strike a match to light a piece of paper, or a piece of birch bark, or a piece of felt paper, or a piece of fatwood.

我把它们放在那儿，划一根火柴，点燃一张纸，或桦树皮，或油毡纸，或明子。

The birch bark culture is a kind of location culture, and it came to being when human being began to use the birch bark to make their daily tools of production and life in the process of social and historic development.

桦树皮文化是人类在社会历史发展过程中使用桦树皮制作生产生活用具而产生的一种地域文化，它包括物质文化和精神文化两个方面。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。