Monday, July 28, 2014

CHIEF SEATTLE: 1855

http://www.context.org/iclib/ic03/seattle/

Important roots can be found in the
original cultures of North America

One of the articles in Rediscovering The North American Vision (IC#3)
Originally published in Summer 1983 on page 6
Copyright (c)1983, 1996 by Context Institute

Some of our most influential roots are the original cultures of this land. The following letter, sent by Chief Seattle of the Dwamish Tribe in Washington to President Pierce in 1855, illustrates the dignity, wisdom, and continuing relevance of this native continental vision.

THE GREAT CHIEF in Washington sends word that he wishes to buy our land. The Great Chief also sends us words of friendship and good will. This is kind of him, since we know he has little need of our friendship in return. But we will consider your offer, for we know if we do not so the white man may come with guns and take our land. What Chief Seattle says you can count on as truly as our white brothers can count on the return of the seasons. My words are like the stars – they do not set.
How can you buy or sell the sky – the warmth of the land? The idea is strange to us. Yet we do not own the freshness of the air or the sparkle of the water. How can you buy them from us? We will decide in our time. Every part of this earth is sacred to my people. Every shining pine needle, every sandy shore, every mist in the dark woods, every clearing, and every humming insect is holy in the memory and experience of my people.
We know that the white man does not understand our ways. One portion of land is the same to him as the next, for he is a stranger who comes in the night and takes from the land whatever he needs. The earth is not his brother, but his enemy, and when he has conquered it, he moves on. He leaves his father’s graves and his children’s birthright is forgotten. The sight of your cities pains the eyes of the redman. But perhaps it is because the redman is a savage and does not understand.
There is no quiet place in the white man’s cities. No place to listen to the leaves of spring or the rustle of insect wings. But perhaps because I am a savage and do not understand – the clatter only seems to insult the ears. And what is there to life if a man cannot hear the lovely cry of the whippoorwill or the arguments of the frogs around a pond at night? The Indian prefers the soft sound of the wind itself cleansed by a mid-day rain, or scented by a pinõn pine: The air is precious to the redman. For all things share the same breath – the beasts, the trees, and the man. The white man does not seem to notice the air he breathes. Like a man dying for many days, he is numb to the stench.
If I decide to accept, I will make one condition. The white man must treat the beasts of this land as his brothers. I am a savage and I do not understand any other way. I have seen thousands of rotting buffaloes on the prairie left by the white man who shot them from a passing train. I am a savage and do not understand how the smoking iron horse can be more important than the buffalo that we kill only to stay alive. What is man without the beasts? If all the beasts were gone, men would die from great loneliness of spirit, for whatever happens to the beast also happens to the man.
All things are connected. Whatever befalls the earth befalls the sons of the earth.
Our children have seen their fathers humbled in defeat. Our warriors have felt shame. And after defeat they turn their days in idleness and contaminate their bodies with sweet food and strong drink. It matters little where we pass the rest of our days – they are not many. A few more hours, a few more winters, and none of the children of the great tribes that once lived on this earth, or that roamed in small bands in the woods will remain to mourn the graves of the people once as powerful and hopeful as yours.
One thing we know that the white man may one day discover. Our God is the same God. You may think that you own him as you wish to own our land, but you cannot. He is the Body of man, and his compassion is equal for the redman and the white. This earth is precious to him, and to harm the earth is to heap contempt on its Creator. The whites, too, shall pass – perhaps sooner than other tribes. Continue to contaminate your bed, and you will one night suffocate in your own waste. When the buffalo are all slaughtered, the wild horses all tamed, the secret corners of the forest heavy with the scent of many men, and the view of the ripe hills blotted by the talking wires, where is the thicket? Gone. Where is the eagle? Gone. And what is it to say goodbye to the swift and the hunt? The end of living and the beginning of survival.
We might understand if we knew what it was the white man dreams, what hopes he describes to his children on long winter nights, what visions he burns into their minds, so they will wish for tomorrow. But we are savages. The white man’s dreams are hidden from us. And because they are hidden, we will go our own way. If we agree, it will be to secure your reservation you have promised.
There perhaps we may live out our brief days as we wish. When the last redman has vanished from the earth, and the memory is only the shadow of a cloud passing over the prairie, these shores and forests will still hold the spirits of my people, for they love this earth as the newborn loves its mother’s heartbeat. If we sell you our land, love it as we have loved it. Care for it as we have cared for it. Hold in your memory the way the land is as you take it. And with all your strength, with all your might, and with all your heart – preserve it for your children, and love it as God loves us all. One thing we know – our God is the same. This earth is precious to him. Even the white man cannot escape the common destiny.

Ilha das Flores (Island of Flowers) 1990

https://www.youtube.com/watch?v=Tppc5GgJI6w

Environmental issues. GM Foods.







 


A useful site to read about environment:

Watch the videos and decide which one is for Genetically Modified Foods and which one is against:





Now that we are studying genetic engineering and transgenics, the media are talking about GMF (genetically modified food)...


Watch these two videos on the following sites:

http://www.monsanto.com/whoweare/Pages/default.aspx

http://www.carighttoknow.org/

And have a look at this article:
http://www.huffingtonpost.com/dave-murphy/california-prop-37_b_1956471.html


More sites:

European Union:

http://www.gmo-compass.org/eng/grocery_shopping/fruit_vegetables/

http://www.gmo-compass.org/eng/grocery_shopping/crops/

http://www.gmo-compass.org/eng/grocery_shopping/processed_foods/




The Future of Food Movie Worksheet                                  Name _______________________

1. What was the green revolution?


2. What are huge fields with only one variety of crop called?


3. What is the problem with genetic uniformity (all one type of crop)?



4. What does an herbicide do?


5. What is a patent?



6. What happened to Percy the farmer?


7. How did GM Monsanto corporation seeds end up in Percy’s field?


8. What % of farmers save their seeds?

a. Bonus: Why do you think they do this?



9. What was the court’s decision against Percy?


10. What are some diseases that have been cured by biotechnology?



11. How are genes placed into corn?



12. Why are bacteria used in genetic engineering?



13. Why are antibiotic marker genes used?



14. What happened to the flavor savor tomato?

15. When did GMOs first become an issue to the public?



16. How many US government agencies are responsible for food safety?


Bonus: Name them



17. What does G.R.A.S. stand for?


18. Why aren’t American foods labeled as GMO?



19. What are some threats to crop yields (the amount of crop harvested)?



20. How are super weeds controlled?


21. Who is Linda Fisher?



22. What has happened to the number of acres planted with GM crops in the U.S. over time?


23. How did GM corn get into Mexico?


24. What do you think genetic diversity is?



25. What happened around the world to U.S. GM made crops?


26. How much money is left for a farmer after they sell their crops?


27. How do farmers stay in business when they are losing so much money?



28. What are the skill sets farmers need to survive today?


29. What happened to the rats and butterflies that ate GM crops?



30. What industries have been consolidated (controlled by a few big businesses)?



31. What is the main reason so many people around the world are starving?



32. What is one problem with international patents?



33. What is terminator technology?




34. What other organisms are being genetically engineered?



35. How will sustainable agriculture be used?



36. What has happened to the amount of money spent on organic food from 90 – 03.



37. What are some alternatives to GM crops?





Wednesday, July 23, 2014

Stem Cells. Células madre.

Activity: Corrosion.

Read the following information about corrosion and fill in all the gaps with one word from the box. Some words can be used more than once:

Oxidation is the most common and well-known form of corrosion. It occurs when a metal (aluminium or steel) is subjected to a gas containing oxygen. Hence most parts will suffer this condition since the atmosphere is made up of 21% oxygen.

When a metal like aluminium is subjected to oxygen, a chemical reaction takes place on the surface of the metal. Two aluminium atoms join three oxygen atoms to form aluminium oxide (Al2O3). If the metal is steel two atoms of iron react with three oxygen atoms to form the oxide (Fe2O3).

There is one significant difference between aluminium oxide and iron oxide: aluminium oxide forms a thin layer on the surface slowing the oxidation process dramatically since the layer seals the metal from the oxygen. Iron however forms a porous layer or oxide on its surface which can easily be penetrated by more oxygen atoms; hence the metal will oxide until it is no more.

The best way to protect against oxidation is simply to prevent the oxygen atoms contacting the metal. Covering the surface with a substance that creates an airtight seal often does this.

Aluminium can be protected by the formation of an oxidation layer preventing more corrosion. Pure aluminium will not oxide, however it is very weak. By rolling a thin layer of pure aluminium on a stronger aluminium we get the benefits of the structural strength and the corrosion protection of the pure aluminium.

alloy               chromium                   faster             first               flake              less
            oil                   oxidation                   oxygen                       paint  
reactive         rusting                       aluminium                  brass              corrosion       green              lead                            magnesium                 malleable            oxide
oxidise           piping             rapidly                       reactivity                  shiny              stored
            structural                              toxic              weakness                   sacrificial
stainless                    water                         zinc


1. Iron (or steel) unfortunately corrodes ………………… than most other transition metals and readily does so in the presence of both ………………… (in the air) and ………………… to form an iron …………………. . Iron corrosion is called ………………… and the chemical change with oxygen is called an ………………………… reaction.

2. Iron and steel (an ………………… of iron) are most easily protected by …………………, which is the cheapest method of prevention and provides a barrier between the metal and the air/water. Moving parts on machines can be protected by a water repellent ………………… or grease layer.

3. Corrosion can be prevented by connecting iron to a more …..……………… metal (e.G. zinc or magnesium). This is called …………….……… protection. By mixing iron with other metals such as ………………… you can make a non-rusting alloy called ………………… steel. Coating iron or steel with a ………………… layer is called “galvanising”. The zinc preferentially corrodes first to form a ………………… oxide layer that does’n ………………… off. However if a less reactive metal is attached, the iron then rusts ………………… as it becomes the most ………………… metal.

4. Aluminium does not ………………… (corrode) as fast as its position in the metal ………………… series would suggest. A thin protective layer of ………………… ………………… forms on the surface, and acts as a barrier to oxygen and water and prevents further ………………… . Aluminium is a useful ………………… metal. It can be made harder, stronger and stiffer by mixing it with small amounts of other metals (e.g. ………………… ) to make alloys.

5. Copper and lead are both used in roofing situations because both are …………………… (easily shaped) and neither is very reactive. The compounds formed do not ………………… away as easily as rust does from iron. Lead corrodes to a white ………………… oxide or carbonate and copper corrodes to form a basic ………………… carbonate. Both metals have beeb used for piping, but these days lead (used by the Romans) is considered too ………………… . The stronger and harder ………………… is still used for ………………… . Copper is mixed with zinc to make the alloy …………………, which is hard wearing and doesn’ t readily corrode. This alloy is used for door knobs and other domestic fittings.

6. The group 1 Alkali Metals are bright and ………………… when freshly cut, BUT ………………… tarnish and corrode in air. So they need to be ………………… under ………………… to reduce corrosion. Apart from their structural ……..……………… they would hardly be used for any outside.

Pasteur's experiment.

 Click here to watch an animation about Pasteur's experiment:


http://bcs.whfreeman.com/thelifewire/content/chp03/0302003.html

Infectious diseases.

ACTIVITY 1: Infectious diseases

Read the following text and complete the concept map on the next page:



Have you ever noticed how a cold seems to travel from one person to another? First, your friend gets sick. Then, your friend’s sister gets sick. Next, her best friend gets sick. Eventually, half the class is suffering with the same symptoms. When a disease outbreak affects many people, it is called an epidemic. The word “epidemic” comes from the Greek words meaning “common among the people”. When this common sickness grows to global proportions it is called a pandemic.



In the 16th century, most people believed that disease was spread by foul air. There were no microbes, germs, or viruses – just air that had lost its ability to keep people healthy. So strong was this belief, that the Italian phrase for bad air, “malaria” was used to identify a common blood disease. In a work entitled “On Contagion”, Girolamo Francastoro proposed in  1546 that epidemic diseases could be caused by seed-like entities trasferred by the air and able to infect healthy individuals. Laboratory data backing Francastoro’s work was slow to appear. In 1870 Louis Pasteur presented his

Germ Theory of Disease, implicating microbes as the cause of infectious disease.



In the mid and late 1800s, recovery from major surgery wasn’t common. Although crude surgical procedures worked, the patients often died of infections - a common report by surgeons was: “operation successfully but the patient died”. The English surgeon Joseph Lister decided to improve his patients’ chances of recovery by sterilizing his instruments and disinfecting the operating room. These procedures used carbolic acid and heat to destroy populations of potentially fatal microbes. As expected, the recovery rate of Lister’s patients improved dramatically.



Ignatz Semmelweis was a Hungarian contemporary of Joseph Lister. Like him, Semmelweis introduced the concept of sterilization and disinfection into the hospital environment. He realized that childbed fever had a lower incidence in patients cared for by midwives. Semmelweis inferred that the midwives’ frequent hand washing reduced the spread of the disease. To improve hospital conditions, he required medical attendants to wash their hands in chlorinated lime. This procedure lowered the incidence of childbed fever, and mortality rates immediately dropped from 18.3% to

1.3%.



In 1878 Robert Koch was studying the spread of anthrax and tuberculosis. From his observations, Koch compiled a set of postulates that outlined the procedure for uncovering an agent of disease:




  1. The suspect microbe must be present in the diseased animal.
  2. The suspect microbe must be isolated from the diseased animal and grown in pure culture.
  3.  When the microbes obtained from the pure culture are introduced into a healthy animal, the animals must become diseased.
  4. Microbes from the new host must be removed and compared with the suspect original microbes to confirm its role in disease.

(Modified from “The Biology corner.com”)



GLOSSARY OF TERMS

A disease outbreak = el brote de una enfermedad 

Foul = repugnante, nauseabundo

Phrase = locución 

Crude = rudimentario

Carbolic acid = ácido carbólico o fenol 

Childbed fever = fiebres puerperales

Chlorinated lime = cal clorada (blanqueador en polvo) 
To uncover = revelar, destapar

A pure culture = un cultivo puro (de microbios)








ACTIVITY 2: Health and disease


With your mate discuss and answer the following questions:



1. What is a disease?



2. What is the WHO?



3. What is an infectious disease?



4. List six examples of infectious diseases.



5. What is a pathogen?



6. What is an epidemic? And a pandemic? Give some examples.



7. What is the most common method to sterilize medical equipment?



8. What is a disinfectant? Can you give some examples of disinfectants?



9. Explain the difference between an antiseptic and a disinfectant. Can you give

some examples of antiseptics?




ACTIVITY 3: Types of disease



Classify the following diseases as infectious / non-infectious diseases. In the third column try to add some specific information from the box below.



rheumatoid arthritis       AIDS        rabies        goitre        diabetes            leukemia     anaemia      scurvy       depression         

cancer              syphilis       anorexia     measles      flu      



INFECTIOUS
NON-INFECTIOUS
DUE TO / SYMPTOMS
















































Degenerative disease / lack of iodine / cells growing without control / genetic disease / virus / sexually transmitted disease / obsessive fear of gaining weight / lack of vitamin C / bacterium / mental disease / autoimmune disease / high blood sugar levels / a change in your emotional state / metabolic disease / inflammation of joints