五千年(敝帚自珍)

主题:我国部分地区大老鼠绝迹 被指与转基因玉米有关 -- 破鱼

共:💬42 🌺82
全看树展主题 · 分页首页 上页
/ 3
下页 末页
家园 方的辟谣反而加重说明谣言有必要

连杂交这种风险较小的危害都这么大,那么风险更大的转基因是不是应该更加谨慎呢?

家园 好奇一下:这个数字怎么来的
家园 十万元是肖教授的总投资

0.5嘛, 是某人发帖劳动所得。

家园 这几年我们这边大老鼠也见不到了

老鼠不如80年代到90年代多,那时候老鼠疯狂的在院墙上奔跑,把木头的门窗都咬得咯咯响,后来不知道什么原因,见不到了,只有些小老鼠出现,也不多,说时候现在农村养猫的也不多,最起码不如过去多,那些年卖气体老鼠药的很多,现在老鼠少了,卖鼠药的也少得多了

家园 如果这是真的的话

我到希望多种点转基因玉米。灭鼠效果那么好,而且还安全。专门用来消灭老鼠多好啊,比现在的剧毒鼠药强太多,直接就把老鼠团灭了,而且还安全,不用担心谁谁谁一激动就用鼠药自杀什么的。人即使误食,至少不会危及生命安全。另外,开个公司,一方面生产灭鼠玉米,另外一方面直接销售“转基因避孕药,绿色无污染,安全又环保”。以后妇女生育过后的节育,直接吃玉米得了,多方便啊

家园 杂交风险小?

是搞一群基因还是搞一个明确的基因风险小?

家园 基因现在已经明确了么?

我看未必,比如基因间是否相互关联呢?基因会不会有内部的自疚能力呢?基因本身是否只单一决定某个功能呢?…………

都没明确,因此根本还没能力搞定点。

而杂交至少在人类经验范围内,还没有太过分的结果。

家园 杂交这些问题都会存在

甚至任何对基因进行改造的手段都要面临这些问题。人类千年筛选良种的历史就是利用各种手段进行基因改造的历史。

您对基因的质疑其实没太多的依据,是我常见的一种本能的排斥反应。

另外,转基因也没有太过分的结果。

家园 老鼠变小了的一个可能解释与epigenetics

The New 'Epigenetics:' Poor Nutrition In The Womb Causes Permanent Genetic Changes In Offspring

In the research report, scientists from the University of Utah show that rat fetuses receiving poor nutrition in the womb become genetically primed to be born into an environment lacking proper nutrition.

As a result of this genetic adaptation, the rats were likely to grow to smaller sizes than their normal counterparts. At the same time, they were also at higher risk for a host of health problems throughout their lives, such as diabetes, growth retardation, cardiovascular disease, obesity, and neurodevelopmental delays, among others. Although the study involved rats, the genes and cellular mechanisms involved are the same as those in humans.

The scientists made this discovery through experiments involving two groups of rats. The first group was normal. The second group had the delivery of nutrients from their mothers' placentas restricted in a way that is equivalent to preeclampsia. The rats were examined right after birth and again at 21 days (21 days is essentially a preadolescent rat) to measure the amount of a protein, called IGF-1, that promotes normal development and growth in rats and humans. They found that the lack of nutrients caused the gene responsible for IGF-1 to significantly reduce the amount of IGF-1 produced in the body before and after birth.

一言以蔽之,如果老鼠在胚胎发育时期营养不良,其出生后基因会发生永久性改变,使其体型变小。

哈佛医学院十月六日有关于epigenetics的免费讲座:October 6 You Are What Your Mother Ate: The New Science of Epigenetic

家园 据说美国人爱吃转基因,20年之后看看实验结果

不过也只能看出墨西哥人的小孩是不是没有原来胖了,还得再过20年.看看这些小孩的小孩是不是个头小了。呵呵呵。挺好。

家园 好啊,今后俺就上娱乐版去耍
家园 应该是"美国人被爱吃转基因"。

根据《食品公司》和这篇文章的说法, 是美国食品和药物管理局(FDA)不愿意强制要求贴标签注明食品含有转基因成分:

The FDA contends that GM foods are substantially equivalent to non-GM foods, and therefore not subject to more stringent labeling.

而美国超市里整株的转基因水果和植物是很少的(there are very, very few genetically-modified whole fruits and vegetables available on produce stands)。但是由于各种精制食品,例如菜油和早餐谷物类,以及由大豆衍生出来的各种食品添加剂,都含有转基因成分,尽管这些成分都很少(some tiny percentage of genetically-modified ingredients),但由于它们的广泛使用,还是使得几乎所有的美国消费者都食用过转基因食品(all U.S. consumers have been exposed to GM food products)。

这里有两个重要的区别:

1)这是美国人民无奈接受的,并非是他们“爱吃”。而是由于FDA的不作为,美国人民无法知道食品中是否含转基因。所以说成是“美国人被爱吃转基因”还差不多。

2)美国人也不是整个地吃转基因食品,而只是食用了极其少量(tiny percentage)的转基因制成品。

所以谁要说“我在美国吃了十几年的转基因食品”那是误导人。砒霜每天吃一点点短时间是没事的。如果当饭吃,肯定叫他当场挂掉。

我不知道方舟子是否说过类似的话。如果说过,那是非常误导人、不负责的说法,不是一个科学工作者在公众场合说话的方式。谁要这么说,谁去把转基因玉米当主食吃上几年再说。

我不是反对转基因,我是反对这种误导。

How prevalent are GM crops? What plants are involved?

According to the FDA and the United States Department of Agriculture (USDA), there are over 40 plant varieties that have completed all of the federal requirements for commercialization (http://vm.cfsan.fda.gov/%7Elrd/biocon). Some examples of these plants include tomatoes and cantalopes that have modified ripening characteristics, soybeans and sugarbeets that are resistant to herbicides, and corn and cotton plants with increased resistance to insect pests. Not all these products are available in supermarkets yet; however, the prevalence of GM foods in U.S. grocery stores is more widespread than is commonly thought. While there are very, very few genetically-modified whole fruits and vegetables available on produce stands, highly processed foods, such as vegetable oils or breakfast cereals, most likely contain some tiny percentage of genetically-modified ingredients because the raw ingredients have been pooled into one processing stream from many different sources. Also, the ubiquity of soybean derivatives as food additives in the modern American diet virtually ensures that all U.S. consumers have been exposed to GM food products.

家园 二十多年前我们那里就不见大老鼠了,用得着你来马后炮
家园 现在的房子几乎都是水泥找平的墙面地面

以前家里的土房子,满地都是老鼠洞,

老鼠我记得分很多种类,我们家那边主要是家鼠和田鼠。

由于社会的发展,现在的家鼠可以打洞的地方太少了,至于田野里,这些年蛇、老鹰等老鼠的天敌特别的多了起来,田鼠的数量能多起来吗?

老鼠少了要找真正的原因。至少我觉得我们那边老鼠少了的原因是这些,因为我们那里根本就没有什么人种玉米与大豆,这样的地方老鼠少了要是也能扯到转基因上去么?

家园 我倒是希望他们爱吃,他们爱吃那多好啊!
全看树展主题 · 分页首页 上页
/ 3
下页 末页


有趣有益,互惠互利;开阔视野,博采众长。
虚拟的网络,真实的人。天南地北客,相逢皆朋友

Copyright © cchere 西西河