Science desk | ||
---|---|---|
< May 14 | << Apr | May | Jun >> | May 16 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Which have the best cleaning property : anionic surfactant, cationic surfactant or nonionic surfactant? — Preceding unsigned comment added by 113.162.202.31 ( talk) 02:59, 15 May 2012 (UTC)
Compare these two statements:
"XXXXX syndrome has a mortality rate of 8%."
and
"XXXXX syndrome has a mortality rate of 8% per annum."
Is it usual to express mortality rate per unit of time, e.g., "8% of people with this syndrome are likely to die within a year"
Or WITHOUT a dimension of time, e.g., "8% of people who develop this syndrome are likely to die from it eventually."
Thanks, Wanderer57 ( talk) 04:19, 15 May 2012 (UTC)
Hi,
how much farther does giraffe see? I mean due to vantage. -- 80.99.254.208 ( talk) 10:59, 15 May 2012 (UTC)
How does the quark structure of a neutron acount for its magnetic moment?-- 188.26.22.131 ( talk) 11:35, 15 May 2012 (UTC)
How do I germinate lemonade seeds, what do I need to do to produce healthy seedlings? I have decided to use a paste made from crushed wheat biscuts mixed with water as a growth medium. The seeds have already been dried, naturally of course. Plasmic Physics ( talk) 11:44, 15 May 2012 (UTC)
Another question: are lemonades grown outside of australasia? Plasmic Physics ( talk) 12:01, 16 May 2012 (UTC)
Found this hawk moth/hornworm on some sort of colocasia.
Found this pupa on a ficus(?) like shrub that grows wild around coastal India. A leaf is visible in the second pic. The moth never had any wings and I can tell that It was a female as it laid a whole lot of eggs a few days later.
Found this pupa on the same species as the previous moth.
Thanks. Hope to make at least some of each set useful for articles once they have been Identified. Staticd ( talk) 12:28, 15 May 2012 (UTC)
Hello,
I am writing a biology paper on inhibiting telomerase to fight cancer, and I'd appreciate some help in interpreting the literature that's out there thus far. I'm not a biology student, but I did this research for a general education biology course at my college.
My literature review is focusing on this study published by Terry earlier this year, which stated that there is no clear relationship between telomere length and cancer risk. However, that seems to contradict the findings of Martinez-Delgado and others, who did find that shorter telomeres could present a risk factor for cancer. Indeed, my lit review has found that scientists have hoped to develop cancer therapies that focus on telomerase inhibition as a way to target malignant cells, and such methods rely on a strong association between telomere length and cancer risk. I know that it's not unusual for scientists to arrive at different conclusions, but what bothers me is that I can't find any articles online that attempt to reconcile these divergent findings. For example, I couldn't find any reactions to the Terry study, which seems to have overturned much of the previous literature. Am I looking at the wrong websites or databases, or am I approaching this paper in the wrong way? 128.135.100.102 ( talk) 15:57, 15 May 2012 (UTC)
It looks like both consider correlations between peripheral blood leucocytes and ovarian cancer. As is too often the case, it looks like the smaller study had the significant (p<0.001) result, and the larger found no correlation. But I wouldn't want to simply discount the role of telomeres, because the larger study found that variation in
TERT. We'd have to get the full papers, pick over every detail of who was chosen for each study, consider the second author's discussion very carefully ... and even then, this is the sort of thing that might have to be resolved over the phone, if at all. Some questions in my mind would be if they were able to control in any way for the effect of cigarette smoking, obesity and so forth
[6] and if there were any technical differences in how the studies did it. The problem is, I doubt it's the shortening of the telomeres per se that will cause cancer; it's probably what happens when a short telomere is found, or when there's no telomere at all. So my gut feeling is that the length of the telomere is the distraction and those polymorphisms in TERT are closer to what you should be interested in. It seems conceivable to me that you could make a drug that would affect TERT and have no effect on telomere length at all, yet affect the risk of cancer e.g. by affecting cellular senescence mechanisms. Wnt (talk) 19:16, 15 May 2012 (UTC)
Here's a numeric example that would give opposite conclusions: 10 young women with short trlomere's: 8 of them have cancer (80%). with long telomeres 30 out of 40 have cancer (75%). The numbers for old women are: short telomers: 60/100 (60%) long: 15/30 (50%) For both groups long telomers give a lower percentage. If you take the totals: short telomers: 68/110 (61%) long telomers: 45/70 (68%). So Martinez would find that short telomers increase the risk for young (80% to 75%) and for old women (60% to 50%) , while Terry would conclude that short telomers decrease the risk (61% to 68%).
Ssscienccce (
talk) 20:21, 15 May 2012 (UTC)
I was looking for a page similar to
de:Wikipedia:Redaktion Biologie/Bestimmung, but it seems that there is none. Anyway, I hope is the right place for my question.
I took a photo of a comely grasshopper and uploaded it to Commons. However, since neither me nor editors from de.wikipedia were able to identify the species, it is not very useful. I hope a biologist from the Southwestern United States may help.
Place:
Zion National Park; time: August. --
Leyo 21:23, 15 May 2012 (UTC)
Science desk | ||
---|---|---|
< May 14 | << Apr | May | Jun >> | May 16 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Which have the best cleaning property : anionic surfactant, cationic surfactant or nonionic surfactant? — Preceding unsigned comment added by 113.162.202.31 ( talk) 02:59, 15 May 2012 (UTC)
Compare these two statements:
"XXXXX syndrome has a mortality rate of 8%."
and
"XXXXX syndrome has a mortality rate of 8% per annum."
Is it usual to express mortality rate per unit of time, e.g., "8% of people with this syndrome are likely to die within a year"
Or WITHOUT a dimension of time, e.g., "8% of people who develop this syndrome are likely to die from it eventually."
Thanks, Wanderer57 ( talk) 04:19, 15 May 2012 (UTC)
Hi,
how much farther does giraffe see? I mean due to vantage. -- 80.99.254.208 ( talk) 10:59, 15 May 2012 (UTC)
How does the quark structure of a neutron acount for its magnetic moment?-- 188.26.22.131 ( talk) 11:35, 15 May 2012 (UTC)
How do I germinate lemonade seeds, what do I need to do to produce healthy seedlings? I have decided to use a paste made from crushed wheat biscuts mixed with water as a growth medium. The seeds have already been dried, naturally of course. Plasmic Physics ( talk) 11:44, 15 May 2012 (UTC)
Another question: are lemonades grown outside of australasia? Plasmic Physics ( talk) 12:01, 16 May 2012 (UTC)
Found this hawk moth/hornworm on some sort of colocasia.
Found this pupa on a ficus(?) like shrub that grows wild around coastal India. A leaf is visible in the second pic. The moth never had any wings and I can tell that It was a female as it laid a whole lot of eggs a few days later.
Found this pupa on the same species as the previous moth.
Thanks. Hope to make at least some of each set useful for articles once they have been Identified. Staticd ( talk) 12:28, 15 May 2012 (UTC)
Hello,
I am writing a biology paper on inhibiting telomerase to fight cancer, and I'd appreciate some help in interpreting the literature that's out there thus far. I'm not a biology student, but I did this research for a general education biology course at my college.
My literature review is focusing on this study published by Terry earlier this year, which stated that there is no clear relationship between telomere length and cancer risk. However, that seems to contradict the findings of Martinez-Delgado and others, who did find that shorter telomeres could present a risk factor for cancer. Indeed, my lit review has found that scientists have hoped to develop cancer therapies that focus on telomerase inhibition as a way to target malignant cells, and such methods rely on a strong association between telomere length and cancer risk. I know that it's not unusual for scientists to arrive at different conclusions, but what bothers me is that I can't find any articles online that attempt to reconcile these divergent findings. For example, I couldn't find any reactions to the Terry study, which seems to have overturned much of the previous literature. Am I looking at the wrong websites or databases, or am I approaching this paper in the wrong way? 128.135.100.102 ( talk) 15:57, 15 May 2012 (UTC)
It looks like both consider correlations between peripheral blood leucocytes and ovarian cancer. As is too often the case, it looks like the smaller study had the significant (p<0.001) result, and the larger found no correlation. But I wouldn't want to simply discount the role of telomeres, because the larger study found that variation in
TERT. We'd have to get the full papers, pick over every detail of who was chosen for each study, consider the second author's discussion very carefully ... and even then, this is the sort of thing that might have to be resolved over the phone, if at all. Some questions in my mind would be if they were able to control in any way for the effect of cigarette smoking, obesity and so forth
[6] and if there were any technical differences in how the studies did it. The problem is, I doubt it's the shortening of the telomeres per se that will cause cancer; it's probably what happens when a short telomere is found, or when there's no telomere at all. So my gut feeling is that the length of the telomere is the distraction and those polymorphisms in TERT are closer to what you should be interested in. It seems conceivable to me that you could make a drug that would affect TERT and have no effect on telomere length at all, yet affect the risk of cancer e.g. by affecting cellular senescence mechanisms. Wnt (talk) 19:16, 15 May 2012 (UTC)
Here's a numeric example that would give opposite conclusions: 10 young women with short trlomere's: 8 of them have cancer (80%). with long telomeres 30 out of 40 have cancer (75%). The numbers for old women are: short telomers: 60/100 (60%) long: 15/30 (50%) For both groups long telomers give a lower percentage. If you take the totals: short telomers: 68/110 (61%) long telomers: 45/70 (68%). So Martinez would find that short telomers increase the risk for young (80% to 75%) and for old women (60% to 50%) , while Terry would conclude that short telomers decrease the risk (61% to 68%).
Ssscienccce (
talk) 20:21, 15 May 2012 (UTC)
I was looking for a page similar to
de:Wikipedia:Redaktion Biologie/Bestimmung, but it seems that there is none. Anyway, I hope is the right place for my question.
I took a photo of a comely grasshopper and uploaded it to Commons. However, since neither me nor editors from de.wikipedia were able to identify the species, it is not very useful. I hope a biologist from the Southwestern United States may help.
Place:
Zion National Park; time: August. --
Leyo 21:23, 15 May 2012 (UTC)