Further studies on the longevity of the eggs of Ascaris lumbricoides and A suum
Further studies on the longevity of the eggs of Ascaris lumbricoides and A suum
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DOI：
10.2307/3271597
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发表时间：
1928-01-01
期刊：
影响因子：
--
通讯作者：
BROWN, H. W.
中科院分区：
文献类型：
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作者：
BROWN, H. W.
1926-1927年冬季，在马里兰州巴尔的摩市，室外沙土培养的类麻拟虫和类麻拟虫的卵保持了活力。在这段时间里，气温几乎每天都在结冰和解冻之间交替。胚胎发育的所有阶段似乎都能很好地承受冻融温度。4月温暖干燥的天气对所有培养的所有虫卵都是致命的，这表明在自然界中，至少在沙质土壤中，这些条件可能会大大缩短蛔虫虫卵的寿命。在一项实验中，在室温下干燥，在35℃的温度下短时间暴露，胚胎在37天内全部死亡；有些在第9天被杀死，而在第28天，绝大多数都死了。晾干一段时间的鸡蛋含有气泡，在受潮时有助于破坏鸡蛋。提出了这种气泡形成的理论。摘要作者：h·w·布朗
Eggs of A. lumbricoides and A. suum in sandy soil cultures out of doors remained viable during the winter months of 1926-1927 at Baltimore, Maryland. During this time the temp. alternated almost daily between freezing and thawing. All stages of embryonic development appeared to withstand freezing and thawing temp. equally well. The warm dry weather of Apr. proved lethal to all eggs in all cultures, indicating that in nature, in sandy soil at least, the longevity of Ascaris eggs may be considerably shortened by these conditions. In an experiment with embryonated eggs of A. suum, dried at room temp. and exposed to a temp as high as 35[degree] C. for a short time, the embryos were all killed within 37 days; some were killed at 9 days, and at 28 days the great majority were dead. Eggs dried for a period contain a bubble of gas which aids in their destruction when moistened. A theory for the formation of this bubble is advanced. || ABSTRACT AUTHORS: H. W. Brown