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17... seems like I'm the youngest around! I'm a Brazilian Chemistry Technician student... Kind regards to all

In Brazil, there is still Jounalism bachelor degree, though it is not needed to have that degree to be a journalist. It's consequence of the decrease of relevance of this area in a global context. Actually, I've seen many jornalists out of the 'print media' scene. There are lots of 'journalists' acting like advertising people, promoting events and keeping theirselves alive through personal engagement in blogs and Twitter (something that some people do for free ). So those "free journalists" seems to get paid from these small temporary works. A fragile condition, obviously. Maybe it's just consequence of the education system development. People are able to write what happens in their lives. And now people are also able to publish what they've written for whole world to see. It's a break-up with a kind of monopoly that has been present for centuries... the information monopoly. What's left to be understood is: are the "normal people" trustable sources for media? A good answer would certainly be: were the journalists trustable sources? For the evident manipulation we've faced in history... I don't know.

Looking for how to prove my two samples are naftol-1 and glicerol... I'm so sure abt that...

I asked kind of a similar question when I was 7 to my grandmother, "wouldn't it be better if we were all dead so we wouldn't need to live so we wouldn't need to wake up or breathe...? it would be much more simple!". I think there is no argument in favor or against this. It's totally closed to how each one handles with their own experiences in life. If you don't live so you don't know that you don't live cause your conscience does not exist anymore. Being dead doesn't ends up suffering only, it simply ends up your existence and any possibility of being conscious of it. If you live then you know where you are and what you are and what you can do. You can imagine, you can dream and create. You can get AIDS, have cancer, feel horrible kinds of pain. Living or dying have their advantages and disadvantages so that we should just balance. If the pain is so high you can't stand for it, if the suffering is over the wish of keep breathing then we'd just go back to euthanasia and suicide taboos. This is life.

Thanks Greippi! But how can I calculate the speed of reaction and the Km (Michaelis constant which means 'concentration of sucrose' when speed of reaction is half the maximum speed)?

Hello people I found myself dealing with this experiment... In my school, we've set 7 tubes with the following quantities of sucrose at pH 5.0 (umol): T1 = 0 T2 = 5 T3 = 10 T4 = 25 T5 = 37.5 T6 = 45 T7 = 50 So after climatization step at 37ºC, we added same quantities of invertase to each tube and took it to water bath at 37ºC for 15 minutes. Then we added DNS and took the tubes to boiling water bath so the enzyme could denature. After their cooling off, we took the tubes to spectofotometer so that T1 was the blank and the absorbance data was taken from the others. For the ones who don't know, point is that this enzyme forms reductor sugars (glucose and fructose) which reduces DNS, darkening it, so we can measure the concentration of sucrose using DNS spectofotometric method. I made a calibration curve using quantities of sucrose (umol) x absorbance data, so it is ok till here. But my BIG problem is basically making a curve for speed of reaction x concentration of sucrose, cause I'm not being able to keep a clear connection between 'concentration of sucrose before reaction' and 'concentration of glucose after reaction' as I don't know how this enzyme works exactly. I mean, I still didn't get how I can calculate the speed of reaction (mg glicose/min) and why it is connected to concentration of sucrose on the graph. Help help Thanks

There is one thing that I simply hate: the personification of simple concepts, as 'nature', 'life' or 'Earth'. These concepts must be treated as natural issues. Life doesn't have a mind, it doesn't think, it's a concept that exists, it's a term, a way to describe a phenomenon, and this kind of distinction is something very rare. So... today, I opened a famous Brazilian magazine, called Época, and there was an interesting topic titled "Were the worms astronauts?". Actually, it referred to an interview with Chandra Wickramasinghe, an astrophysicist that supports the theory of us as evolved from what he calls "alien virus". Through the interview it's possible to read very curious sentences such as "For the Church in the age of Copernicus and Galileu, Earth was the center of the Universe. At 21st century, we didn't see the obvious yet: life came from space". Ooops, I see some sensationalism here. We all understand that it's possible to guess that complex life (like bacteria) could have come from meteorites; a big example (also cited in the interview) is the extremophile microorganisms (such as the famous Deinococcus radiodurans). But the arguments that Chandra presents are totally outdated, as we can see when he answers the question "What are the evidences of our cosmic ancestrality?", and he says: Seems like all our doubts about life occurence are over! And seems like he stills consider Vitalism as a valid argument. Oh bad thing! And suddenly, after trying to support his thoughts at any cost, he says: Vidya Jothi Nalin Chandra Wickramasinghe is a Professor of Mathmatics and Astronomy in Cardiff University (UK). By Sir Fred Hoyle side, Chandra developed the panspermia theory, which says that life comes from space. I'm not trying to blow him and his theory up. I'm just trying to find convincing arguments. So, what do you think?

that was the best thing I've read till date... nothing more than desire! btw, i'm also going to try something like that.. i'll try the peroxide first as it's easier, then i just titrate everything at college.

Hahaha That's why we don't call it winter vacation, we call it like "middle-of-the-year" vacation as our winters are really hot.

This discussion carries a bunch of ideas that must be analyzed deeper. 1. Is having sex for fun wrong? 2. Doesn't straight couples make sex for fun? There are many religious concerns involved, but in my opinion, the discussion wasn't supposed to have as main group homosexuals, of course they can't have kids, but it's obvious that most of the straight couples have sex for fun.

Well, in Brazil, we have about 8 weeks of summer vacations, 4 weeks of winter vacations and many other separated holidays (and 1 week for carnival) But it depends on the school, I mean, I studied in a school that had only 1 week of winter holidays. So it's about 10-15 weeks of school holidays in Brazil. It's great though I think the period of study is too tiny and it's hard to have time to have some fun as teachers hurry up and we have to keep up with the fast rhythm.

Harry Potter movies are SHIT. But the books are excelent. I like LOTR and HP but I can't just choose one. ><

At first, it's obvious that there is a history behind what happens today. I can barely say that the most important reason for all this against-homosexuality is based on religion. I can say that because I face it at home... "God hates Fags" has many names and it's not the only source of prejudging. There are still many false ideas like gays are more promiscuous or gays need to act like women, it's not true. Another very importante myth is that being gay is a choice. IT IS NOT TRUE. It's not something you choose, it's an organic condition. People just can't realize it or even try to understand since there is a big history beyond this discussion. There is much about it that we can find on Web, specially on YouTube.

I don't think FAST food is CHEAP food though. Here in Brazil, McDonalds is EXTREMELY expensive than in US. I know that because I have friends in Florida that came to Rio and they thought it a McAbsurd.

I have the same doubt about careers and I am, as you, really curious about the difference between pure Chemistry and Chemical Engineering. I don't know if Engineering is the right thing for me. I don't know exactly if I really want to work in a factory, I'm still kinda young so I still have many doubts, but I'm sure I'll do something with Chemistry in the future.

haha Awesome joke. I'm gonna translate it to tell friends. But, I've got a question, is this freaking real?!?!

In Brazil, we are used to DD/MM/YYYY... but if I write in English I usually switch DD with MM and I don't think it's really a big problem. However, MM/DD/YYYY is very common on Internet and very used by open source softwares (as the default option is usually the form is MM/DD/YYYY).

OK, in Portuguese, "the" is replaced by "o", "a", "os" or "as", "o" is for singular and masculine nouns, "a" for singular and feminine nouns, "os" for plural and masculine nouns and "as" for plural and feminine nouns. Even though it's a big difference, I don't think it makes learning English harder as you just put "the" when you want to mean any of the four Portuguese definite articles. However, that doubt of when putting "the" I had once before, but it was easily solved when I realized that proper names have the idea of "the ..." for itself. Portuguese grammar has many unnecessary things, so we're always repeating ideas, like "as casas verdes" (the green houses). All the highlighted "s" has the same intention: the plural of house. And we put the plural on the article and on the adjective so it follows the noun, it doesn't happen in English.

Most of my friends (including all my best friends and me) are atheist. I have no idea why cause I did not choose them because they had no religion, it was not more than a coincidence. Here in Brazil, people are not so closed to religion, we're usually more easygoing when atheism is discussed, of course it's not SO easy as my mother hates to think about me as an atheist since she is an almost fanatic Catholic.

Chem, but it will probably be turned to Biology or Computer in the future

If an idea becomes "popular" there are certainly good reasons that support the idea itself. However, I was not criticizing, just making some fun of your reply