As a scientist who has published numerous refereed papers, some in the PNAS, I can tell you exactly what likely means. It means that while they may believe the statement to be true they do not have sufficient evidence to support the statement.
The whole notion that we humans have sufficient knowledge and power to alter the environment in ways we choose is ridiculous. Planet Earth is going to change with or without human help. The notion that the planet should stay in its current configuration is as flawed as the notion that the world is flat.
I've got an old 11c; more then 20 years old. Last year the original batteries died. Granted I haven't used it a lot lately. But I digress. I bought six or seven sets of batteries for it. I wasn't sure which kind to get but they all would fail within a week to a month. I tried several different kinds of batteries and they would work fine. I would use the calculator for maybe a half-hour, shut it off and then the next time, ussually a week or more later, I go to use it, the batteries are dead. All the batteries were labelled "calculator battery"; some were alkaline.
Finally due to my love of RPN for balancing the checkbook, I spent some time on the HP web site and identified the proper batteries. Viola, the thing has worked for about a year now and I suspect will prolly outlive me. Unless you are sure that you have the right batteries, don't give up on the power drain issue. I was shocked to see such a difference in battery usage; the wrong ones drained even when not in use. As to the noise, I haven't a clue.
I beg to differ. The HEK293 cell line can hardly be considered a "stem cell". It is transformed by adenovirus DNA, i.e., it is a tumor cell, and is not diploid, hypotriploid according to the ATCC. You seem to be confusing embryonic and stem cell. Embryonal stem cells are diploid and are not cancerous.
http://www.atcc.org/SearchCatalogs/longview.cfm? vi ew=ce,916189,CRL-1573&text=hek293&max=20
HEK293 was derived in 1977 or thereabouts from the kidney of a human embryo (I assume because of the name). To immortalize the cells, Graham et al made the cells incorporate (eat, transfected) DNA isolated from an adenovirus that they knew caused tumors. You almost never heard about scientists chopping up human embryos back then.
Embryos have become much more valuable and interesting due to stem cell technology. An explosive growth in the use and storage of stem cells poses novel legal issues in addition to ethical issues. Hence the current political interest in the use of embryos. The current limitations are quite restrictive and resemble limitations imposed when recombinant DNA technology became possible. The limitations on rDNA research lasted about five years, the dark ages (73 to 78 or 79). They were pretty much abolished by the mid 80s. I suspect that the enormous health benefits possible from stem cell research will lead to a swift (>5 years) relaxation of the restrictions.
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As a scientist who has published numerous refereed papers, some in the PNAS, I can tell you exactly what likely means. It means that while they may believe the statement to be true they do not have sufficient evidence to support the statement. The whole notion that we humans have sufficient knowledge and power to alter the environment in ways we choose is ridiculous. Planet Earth is going to change with or without human help. The notion that the planet should stay in its current configuration is as flawed as the notion that the world is flat.
I've got an old 11c; more then 20 years old. Last year the original batteries died. Granted I haven't used it a lot lately. But I digress. I bought six or seven sets of batteries for it. I wasn't sure which kind to get but they all would fail within a week to a month. I tried several different kinds of batteries and they would work fine. I would use the calculator for maybe a half-hour, shut it off and then the next time, ussually a week or more later, I go to use it, the batteries are dead. All the batteries were labelled "calculator battery"; some were alkaline. Finally due to my love of RPN for balancing the checkbook, I spent some time on the HP web site and identified the proper batteries. Viola, the thing has worked for about a year now and I suspect will prolly outlive me. Unless you are sure that you have the right batteries, don't give up on the power drain issue. I was shocked to see such a difference in battery usage; the wrong ones drained even when not in use. As to the noise, I haven't a clue.
I beg to differ. The HEK293 cell line can hardly be considered a "stem cell". It is transformed by adenovirus DNA, i.e., it is a tumor cell, and is not diploid, hypotriploid according to the ATCC. You seem to be confusing embryonic and stem cell. Embryonal stem cells are diploid and are not cancerous.
? vi ew=ce,916189,CRL-1573&text=hek293&max=20
http://www.atcc.org/SearchCatalogs/longview.cfm
HEK293 was derived in 1977 or thereabouts from the kidney of a human embryo (I assume because of the name). To immortalize the cells, Graham et al made the cells incorporate (eat, transfected) DNA isolated from an adenovirus that they knew caused tumors. You almost never heard about scientists chopping up human embryos back then.
Embryos have become much more valuable and interesting due to stem cell technology. An explosive growth in the use and storage of stem cells poses novel legal issues in addition to ethical issues. Hence the current political interest in the use of embryos. The current limitations are quite restrictive and resemble limitations imposed when recombinant DNA technology became possible. The limitations on rDNA research lasted about five years, the dark ages (73 to 78 or 79). They were pretty much abolished by the mid 80s. I suspect that the enormous health benefits possible from stem cell research will lead to a swift (>5 years) relaxation of the restrictions.