Cheapest Fertilizer?

Bio solids are safe to be spread on farms and forests?

Bio solids contain concentration of most heavy metals as well as some pathogens and toxic organics that flushed and dumped down residential and industrial drains. Bio solid is what is left behind after water is cleaned in waste treatment works. It is high in organic content and plant nutrients and in theory makes a good fertilizer. the question is, are the bio solids are safe to be spread on the farms?


The application of sewage sludge to land, especially on agricultural lands has been contentious since the late 1980s, when national and international clean water regulations prohibiting the ocean dumping of sludge were first enacted. Advocated enthuse about the natural ability of sludge, like soil, to immobilize potentially toxic metals and they point to cleaner water as well as higher crop yields for farms that use the material.
In Asia, using human waste as fertilizer is nothing new. The Asian culture have done it for like centuries. Farmers in Northeast Minnesota are using a fertilizer rich in phosphorus, nitrogen and organ (human waste) matter that can boost crop yields by 80 percent. Many farmers who owns thousand or millions acres of land use bio solid as fertilizer for their plants. However, the problem is that those cheap fertilizers is made of treated human waste, which opponents say is environmentally unsafe and unhealthy for animal and other people.


Federal records obtained by the National Post show almost 20% of fertilizers and composts made from human sewage and other matter, and used widely throughout the country on lawns and gardens, are in violation of federal limits for microbial contamination. Federal records also point that these fertilizers are sold across the country. the study, published by the International Water Management Institute (IWMI), says that 10% of the population, mostly developing nations, eat grains and vegetables harvested from fields irrigated and fertilized with raw sewage. in Vancouver, health officials are being urged to stop using human waste as fertilizers because of cancer-causing toxins getting into the food.
Fecal coliforms and salmonella are considered "indicator" species because they are such hardy microbes. if they survive sewage treatment and composting processes, so might more serious pathogens.


A search of the National Library of Medicine's comprehensive Medline database revealed no scientific article claiming that sewage sludge had caused disease. conceivably, that negative result could result from inadequate research, but given the long history of concern, "if it was causing a problem, it would make itself apparent, and it has not," says Sarah Clark Stuart, a member of the NRC committee and a program officer at the Pew Charitable Trusts in Philadelphia, Pennsylvania.


Pros:
-it is a cost effective method of disposal
-reduces emissions from transportation to landfills
-good free fertilizers
Cons:
- potential health hazard
-contamination resulting from accumulation of industrial waste
-may contain hazardous chemicals
-not sufficiently regulated
-odor


Sewage sludge as a fertilizer is disgusting to think and might as well not to eat any vegetables anymore after reading this blog. but think of it, some of the farmers use sewage sludge because it saves them money and they think that sewage sludge is organic and good for the plants. also, i dont think that sewage sludge as fertilizer is unsanitary and disgusting nuisance in fact i think it is good because those sewage sludge are nowhere to go. for me, id rather put the sewage sludge as fertilizer since they say that it is good than throw it to the ocean.




Web source:
http://ehp.niehs.nih.gov/qa/105-1focus/focusbeauty.html

http://www.google.ca/imgres?imgurl=http://blog.oregonlive.com/news_impact/2008/10/biosolidone20.jpg&imgrefurl=http://www.oregonlive.com/money/index.ssf/2008/10/oregon_farmers_are_loving_bios.html&usg=__E4OT15sl7wTSA7Z7yQ1UED08G7Y=&h=635&w=1024&sz=409&hl=en&start=14&itbs=1&tbnid=8d8diXD2Jiu7iM:&tbnh=93&tbnw=150&prev=/images%3Fq%3Dhuman%2Bwaste%2Bas%2Bfertilizers%26hl%3Den%26safe%3Dactive%26gbv%3D2%26tbs%3Disch:1

http://www.safe2use.com/ca-ipm/02-05-21c.htm

http://www.greatlakesdirectory.org/mn/101203_great_lakes.htm

http://boingboing.net/2008/08/27/human-waste-as-ferti.html

http://www.sencer.net/Outreach/pdfs/DCSymposium08/Posters/LUbiosolids.pdf


Photo source:

http://www.epa.gov/region6/water/npdes/images/biosolids1.jpg

http://huey.colorado.edu/77DegreesSouth/environment/08_HumanWaste.jpg

http://blog.oregonlive.com/news_impact/2008/10/biosolidone20.jpg

http://www.novaquatis.eawag.ch/arbeitspakete/nova6/contentpics/pic3

http://www.cartoonstock.com/newscartoons/cartoonists/rma/lowres/rman9309l.jpg

Medical Technology

What is medical technology?

Medical technology is a device or intervention to extend the life of patients, relieve pain and to reduce risk of disease.

- Medical technology helps human to continue life on earth. It can allow quicker diagnosis which allows early treatment.

History

Medical technology started in the nineteenth century. Most medical tools fit easily into the doctor's little black bag, and diagnoses were based more on instinct than on science.


Wilhelm C. Roentgen was the first man who discovered an electromagnetic radiation that could pass through the body and leave an image of its bones or organs on a photographic plate in 1895. Roentgen is a German Physicist.


Since then, many physicians or scientist invented a radiology to diagnose problems. And so, now images may be produced by sound waves (sonograms), radio waves in a strong magnetic field called magnetic resonance or MR scans, or minute amounts of radioactive material injected into the patient called nuclear medicine, known to some of its detractors by the anagraphic unclear medicine.

The importance of various technology to our understanding of internal body systems

Medical technology has an important role in our lives because without it we would not find a reason why for instance if a person dies. Also, we would not have an information about what is going on with our internal body.

A recent report by the Canadian Institute for Health Information (2007) looked at trends in hospital use. it is suggested that "advance in medical technology is leading to more efficient ways of treating inpatients". The report found that more operations are being performed as outpatient day surgeries across Canada. the total number of patients increased and the total number of number of age-standardized rate decreased.
By all means, Medical technologies are very useful it can improve access to care, it can improve effectiveness of care, decrease morbidity and mortality, speed up recovery and increase patient comfort. these benefits are not just theoretical, but have been quantified in published studies.

Health Technologies Timeline

To see the health technologies timeline visit this website:
http://www.greatachievements.org/?id=3824






WebSource:

http://www.kff.org/insurance/snapshot/chcm030807oth.cfm

http://wiki.answers.com/Q/What_impact_does_technology_have_in_health_care

http://www.ehow.com/about_4672066_medical-technology.html

http://www.resumel.com/topic/give+examples+of+medical+technology

http://www.greatachievements.org/?id=3824

http://www.canhealth.com/News928.html


Photo source:

http://www.saburtechnology.com/images/medical-device-products.jpg

http://www.google.ca/imgres?imgurl=http://www.amglimited.ca/images/utar-biomedical.jpg&imgrefurl=

http://www.google.ca/imgres?imgurl=http://www.designworldonline.com/uploads/ImageGallery/jan%2520dfi%25207.jpg&imgrefurl=

http://www.google.ca/imgres?imgurl=http://www.unn-edu.net/wp-content/uploads/2010/02/Importance-of-Medical-Journals.jpg&imgrefurl=

http://www.google.ca/imgres?imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinmWXGrObVRGDoytr-7uiYSWoeENo0ttBnTGgsDlfcx_lx9dV8eK0F32OrjH6T-d3pDo3XeSsHjbWw_6TLJlaFzJ5RBzMb7j-r4wvk88zdPPOO69qjpR86sKHIWL_tICpPIas6_NGDmvOS/s400/Wilhelm_C_Roentgen_1.jpg&imgrefurl=

Artificial selection: good or bad?

Artificial Selection: Good or Bad?

What is artificial selection?

Artificial selection is the breeding of certain traits over other traits. Artificial selection is relatively easy to accomplish. A specific heritable genetic trait that the breeder desires. the plant or animal is then breed with another of its kind with similar trait, resulting in offspring until the specific traits is achieved at the desired level.

Result of artificial selection
Artificial selection are easy to see.
For example: The domestication cycle of dogs (canines) being breed by their owners in order to emphasize lees-aggressive traits has gone on for years, and has almost nothing like their grey wolf ancestors.
Daily cattle are bred in in hopes of producing more milk, but some lines now suffer from increased infections and fertility problems.
Persian cats that are bred for extremely flat faces often develop respiratory problems and may have trouble eating.


What is Natural Selection?

Natural selection is the mechanism of evolution, the procvess in nature by which only the organisms that are best adapted to their environment tend to survive and transmit their genetic characteristics to the next generation. Individuals less well adapted to their environment tend to be eliminated, where environment represents the combined biological and physical influences.

Results for Natural selection



For example ; The peppered moth (Biston betularia) is a temperate nocturnal moth species that provides us with a great example of natural selection. "The peppered Moth Pre-industrial Revolution." The common colour of peppered moths was light grey (Biston betulana f. typica), and this colour type represented life predominant revolution. the moth's light grey colour closely matched the lichen-covered trees in their environment. (lichens are a slow growing life form that you can find on the bark of a many trees and in decomposing woods.)


Is artificial selection good or bad?

For me, artificial selection is either good or bad because all of the listed traits that are bred for do not help the animals to survive in the wild. I think, the only thing why do humans bred other animals is for their own desire. Humans wants to be unique. It would not be necessary for the breeders to know that traits are inherited. By spurning animals or plants that did not meet whatever requirements they were after they would still be imposing selection. Dogs are perhaps a good example as they have a long history of domestication by humans. Many breeds now kept as pets are a lot more docile than their wild counterparts, but one can imagine a dog prone to attacking humans would be driven out or killed by our ancestors. Thus, these animals would have a far lower chance of passing on their genes. Conversely, dogs that were submissive and did what we wanted would be favoured, both in being protected from predators and fed or watered.


What about you? What do you think about Artificial selection?

Sources:
http;//geneticsevolution.suite101.com
http://www.askabiologist.org.uk
http://www.babasword.com/writing/rge/Artificial%20Selection.pdf
http://www.mindbites.com/lesson/3931-biology-artificial-selection-in-action

Designer Babies

What is a Designer Babies?

Advanced reproductive technologies allow parents and doctors to screen embryos for genetic disorders and select healthy embryos.

Advanced reproductive techniques involve using InVitro Fertilisation or IVF to fertilise eggs with sperm in 'test-tubes' outside the mother's body in a laboratory. These techniques allow doctors and parents to reduce the chance that a child will be born with a genetic disorder. At the moment it is only legally possible to carry out two types of advanced reproductive technologies on humans. The first involves choosing the type of sperm that will fertilise an egg: this is used to determine the sex and the genes of the baby. The second technique screens embryos for a genetic disease: only selected embryos are implanted back into the mother's womb. This is called Pre-implantation Genetic Diagnosis (PGD).






Designer Baby


Until just a few years ago, making a baby boy or a baby girl was pretty much a hit-or-miss affair. Not anymore. Parents who have access to the latest genetic testing techniques can now predetermine their baby's sex with great accuracy.

Within a decade or two, it may be possible to screen kids almost before conception for an enormous range of attributes, such as how tall they're likely to be, what body type they will have, their hair and eye color, what sorts of illnesses they will be naturally resistant to, and even, conceivably, their IQ and personality type.

In fact, if gene therapy lives up to its promise, parents may someday be able to go beyond weeding out undesirable traits and start actually inserting the genes they want--perhaps even genes that have been crafted in a lab. Before the new millennium is many years old, parents may be going to fertility clinics and picking from a list of options the way car buyers order air conditioning and chrome-alloy wheels. "It's the ultimate shopping experience: designing your baby," says biotechnology critic Jeremy Rifkin, who is appalled by the prospect. "In a society used to cosmetic surgery and psychopharmacology, this is not a big step."

The prospect of designer babies, like many of the ethical conundrums posed by the genetic revolution, is confronting the world so rapidly that doctors, ethicists, religious leaders and politicians are just starting to grapple with the implications--and trying to decide how they feel about it all.

They still have a bit of time. Aside from gender, the only traits that can now be identified at the earliest stages of development are about a dozen of the most serious genetic diseases. Gene therapy in embryos is at least a few years away. And the gene or combination of genes responsible for most of our physical and mental attributes hasn't even been identified yet, making moot the idea of engineering genes in or out of a fetus. Besides, say clinicians, even if the techniques for making designer babies are perfected within the next decade, they should be applied in the service of disease prevention, not improving on nature.



Adapting a technique used on livestock, researchers at the Genetics & IVF Institute in Fairfax took advantage of a simple rule of biology: girls have two X chromosomes, while boys have one X and one Y. The mother has only Xs to offer, so the balance of power lies with the father--specifically with his sperm, which brings either an X or a Y to the fertilization party.

As it happens, Y chromosomes have slightly less DNA than Xs. So by staining the sperm's DNA with a nontoxic light-sensitive dye, the Virginia scientists were able to sort sperm by gender--with a high rate of success--before using them in artificial insemination. The first couple to use the technique was looking to escape a deadly disease known as X-linked hydrocephalus, or water on the brain, which almost always affects boys.

But while the technique is ideal for weeding out this and other X-linked disorders, including hemophilia, Duchenne muscular dystrophy and Fragile X syndrome, most patients treated at Genetics & IVF want to even out their families--a life-style rather than a medical decision.

So humans (and other species) have always created “designer babies” with various probabilities of success, and this is nothing new. With the advances in the DNA technology, the probability of producing a baby with desired traits will likely increase, but it will never be guaranteed for most traits (those with less than 100% heritability). On the other hand, if a blonde, blue-eyed woman marries (or mates with) a blond, blue-eyed man, she is virtually guaranteed to have a blonde, blue-eyed baby, whereas if she marries (or mates with) a black-haired, brown-eyed man, she substantially reduces the probability of having a blonde, blue-eyed baby. The Swedes have been producing their “designer babies” this way for thousands of years now, and they never needed any DNA technology. Every woman who chooses to marry a tall, handsome, intelligent, kind, and hard-working man instead of a short, ugly, unintelligent, mean, and lazy man is in essence unconsciously and probabilistically creating a “designer baby.”

If you could design your baby's features, would you?

Sources:


http://www.geneticsandsociety.org/article.php?id=127

http://www.prochoiceforum.org.uk/ocrreliss7.php

http://www.readersdigest.ca/mag/2001/09/designer_babies.html

http://www.bionetonline.org/English/content/db_cont1.htm


Pictures:

http://www.firstscience.com/home/images/cartoons/li160.jpg

http://blogs.usatoday.com/photos/uncategorized/2008/07/25/louisebrown_2.jpg

http://physiciansforwomen.net/uploads/images/baby-and-blanket.jpg