2013年6月4日星期二

Chimpanzees have five universal personality dimensions

Chimpanzees have five universal personality dimensions

June 3, 2013 — While psychologists have long debated the core personality dimensions that define humanity, primate researchers have been working to uncover the defining personality traits for humankind's closest living relative, the chimpanzee. New research, published in the June 3 issue of American Journal of Primatology provides strong support for the universal existence of five personality dimensions in chimpanzees: reactivity/undependability, dominance, openness, extraversion and agreeableness with a possible sixth factor, methodical, needing further investigation.






"Understanding chimpanzee personality has important theoretical and practical implications," explained lead author Hani Freeman, postdoctoral fellow with the Lester E. Fisher Center for the Study and Conservation of Apes at Lincoln Park Zoo. "From an academic standpoint, the findings can inform investigations into the evolution of personality. From a practical standpoint, caretakers of chimpanzees living in zoos or elsewhere can now tailor individualized care based on each animal's personality thereby improving animal welfare."

The study of chimpanzee personality is not novel; however, according to the authors, previous instruments designed to measure personality left a number of vital questions unanswered.

"Some personality scales used for chimpanzees were originally designed for another species. These 'top-down' approaches are susceptible to including traits that are not relevant for chimps, or fail to include all the relevant aspects of chimpanzee personality," explained Freeman. "Another tactic, called a 'bottom-up' approach, derives traits specifically for chimpanzees without taking into account information from previous scales. This approach also has limitations as it impedes comparisons with findings in other studies and other species, which is essential if you want to use research on chimpanzees to better understand the evolution of human personality traits."

To address the limitations of each approach and gain a better understanding of chimpanzee personality, the authors developed a new personality rating scale that incorporated the strengths of both types of scales. This new scale consisted of 41 behavioral descriptors including boldness, jealousy, friendliness and stinginess amongst others. Seventeen raters who work closely and directly with chimpanzees used the scale to assess 99 chimpanzees in their care at the Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center in Bastrop, Texas.

The chimpanzees rated were aged 8 to 48, a majority had been captive born and mother-raised, and all had lived at the facility for at least two years.

To validate their findings, the researchers used two years worth of behavioral data collected on the chimpanzees. As the authors expected, the findings showed the personality ratings were associated with differences in how the chimpanzees behaved. The researchers also showed the raters tended to agree in their independent judgments of chimpanzees' personalities, suggesting the raters were not merely projecting traits onto the chimpanzees.

Researchers suggest that one benefit to having the chimpanzees rated on the five core personality dimensions is that this information can now be used to make predictions that will help in their management, such as how individual chimpanzees will behave in various social situations. This type of information will help zoos better anticipate certain behaviors from various individuals, and will assist them in providing individualized care.



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No early birds getting the worms: Songbirds risk missing peak food supply

No early birds getting the worms: Songbirds risk missing peak food supply

The study, "A Trans-Hemispheric Migratory Songbird Does Not Advance Spring Schedules or Increase Migration Rate in Response to Record-Setting Temperatures at Breeding Sites," published in the journal PLOS ONE, tracked the spring migration of purple martins over five years from the Amazon basin to two breeding sites in eastern North America. Researchers outfitted the birds with tiny geolocator "backpacks" to record data on their movements and found that the birds' departure times between years were surprisingly consistent, despite variation in temperature at their final destination.

"We found that purple martins migrating between the Amazon Basin and North America did not adjust their migration timing even during the hottest spring on record in 2012," says study author Kevin Fraser, a Postdoctoral Fellow in York's Department of Biology, Faculty of Science. "This means that they arrived 'late' for the advanced spring, and likely missed out on peak food they need to be productive breeders."

Aerial insectivores, like purple martins and other swallows, are experiencing strong population declines, particularly species migrating longer distances and populations breeding further north. Scientists have shown in a European species that declines may be due to an inability to advance arrival schedules to match a warming climate. This study provides the first direct evidence of a discrepancy between higher spring temperatures at breeding sites and departure schedules of individual songbirds.

"Our results suggest that long-distance migrants may receive limited or conflicting environmental cues about conditions at the breeding grounds while still at overwintering sites or along migration routes," says Fraser. "Once en route, the birds received no temperature cues of the warm spring until they reached the US Gulf coast, at which point it was likely too late to get to breeding sites earlier." Fraser says such mistiming is an active area of new research, and with climate change may be an important contributing factor to migratory songbird declines.

"Some migratory songbirds may not have the flexibility they need to respond quickly to earlier springs and more variable weather with climate change, which could contribute to the strong population declines we see in many species. Identifying which species or populations may be at greatest risk will be very important for guiding effective conservation action."

He says the study suggests that migration timing and rate in purple martin is not highly sensitive to short-term variation in temperature and rainfall, and that multiple years of increasing spring temperatures may be required to shift the birds to an earlier breeding arrival time through natural selection for earlier departure from tropical overwintering sites.


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Blood vessels in the eye linked with IQ, cognitive function

Blood vessels in the eye linked with IQ, cognitive function

Research shows that younger people who score low on intelligence tests, such as IQ, tend to be at higher risk for poorer health and shorter lifespan, but factors like socioeconomic status and health behaviors don't fully account for the relationship. Psychological scientist Idan Shalev of Duke University and colleagues wondered whether intelligence might serve as a marker indicating the health of the brain, and specifically the health of the system of blood vessels that provides oxygen and nutrients to the brain.

To investigate the potential link between intelligence and brain health, the researchers borrowed a technology from a somewhat unexpected domain: ophthalmology.

Shalev and colleagues used digital retinal imaging, a relatively new and noninvasive method, to gain a window onto vascular conditions in the brain by looking at the small blood vessels of the retina, located at the back of the eye. Retinal blood vessels share similar size, structure, and function with blood vessels in the brain and can provide a way of examining brain health in living humans.

The researchers examined data from participants taking part in the Dunedin Multidisciplinary Health and Development Study, a longitudinal investigation of health and behavior in over 1000 people born between April 1972 and March 1973 in Dunedin, New Zealand.

The results were intriguing.

Having wider retinal venules was linked with lower IQ scores at age 38, even after the researchers accounted for various health, lifestyle, and environmental risk factors that might have played a role.

Individuals who had wider retinal venules showed evidence of general cognitive deficits, with lower scores on numerous measures of neurospsychological functioning, including verbal comprehension, perceptual reasoning, working memory, and executive function.

Surprisingly, the data revealed that people who had wider venules at age 38 also had lower IQ in childhood, a full 25 years earlier.

It's "remarkable that venular caliber in the eye is related, however modestly, to mental test scores of individuals in their 30s, and even to IQ scores in childhood," the researchers observe.

The findings suggest that the processes linking vascular health and cognitive functioning begin much earlier than previously assumed, years before the onset of dementia and other age-related declines in brain functioning.

"Digital retinal imaging is a tool that is being used today mainly by eye doctors to study diseases of the eye," Shalev notes. "But our initial findings indicate that it may be a useful investigative tool for psychological scientists who want to study the link between intelligence and health across the lifespan."

The current study doesn't address the specific mechanisms that drive the relationship between retinal vessels and cognitive functioning, but the researchers surmise that it may have to do with oxygen supply to the brain.

"Increasing knowledge about retinal vessels may enable scientists to develop better diagnosis and treatments to increase the levels of oxygen into the brain and by that, to prevent age-related worsening of cognitive abilities," they conclude.


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New way fish camouflage themselves in the ocean discovered

New way fish camouflage themselves in the ocean discovered

June 3, 2013 — Fish can hide in the open ocean by manipulating how light reflects off their skin, according to researchers at The University of Texas at Austin. The discovery could someday lead to the development of new camouflage materials for use in the ocean, and it overturns 40 years of conventional wisdom about fish camouflage.






The researchers found that lookdown fish camouflage themselves through a complex manipulation of polarized light after it strikes the fishes' skin. In laboratory studies, they showed that this kind of camouflage outperforms by up to 80 percent the "mirror" strategy that was previously thought to be state-of-the-art in fish camouflage.

The study was published this month in the Proceedings of the National Academy of Sciences (PNAS). The research was funded by the U.S. Navy, which has an interest both in developing better ocean camouflage technologies and in being able to detect such strategies if developed by others.

"The open ocean represents a challenging environment for camouflage," said Molly Cummings, associate professor of integrative biology in the College of Natural Sciences. "There are no objects to hide behind in three-dimensional space, so organisms have to find a way to blend in to the water itself."

For the past few decades the assumption has been that the optimal camouflage strategy for open ocean fish is to reflect sunlight like a mirror. Many fish, including the lookdown, have reflective skin elements that can act like mirrors.

Such a strategy works well for certain aspects of light, such as color and intensity, which tend to be distributed homogenously in the region surrounding the fish. The mirror strategy is not optimal, however, when light is polarized, which occurs when individual waves of light align parallel to one another.

"In the polarized light field, there is a lot of structure in the open ocean," said physicist Parrish Brady, a postdoctoral associate in Cummings' lab. "Humans can't see it, but more than 60 different species of fish have some degree of polarization sensitivity. They can perceive the structure in the light."

The contours of the polarized light field in the open ocean environment are constantly changing except at noon, when the sun is directly overhead. A fish needs to do more than deploy the straight mirror strategy in order to stay camouflaged. Cummings hypothesized that perhaps nature had evolved a strategy to do just that.

She and Brady caught some lookdowns, which are known as good camouflagers. In tanks in the lab, they simulated the sun passing over the ocean during the course of a day, and they used a custom-built polarimeter to measure how the lookdowns reflected the polarized light.

They found that the lookdowns were able to manipulate their reflective properties in ways that were close to the theoretical optimum and far better than a standard mirror.

"The nifty thing is when we mimicked the light field when the sun is overhead, as it would be at noon, the fish just bounced back that light field," said Cummings. "It acted like a mirror. Then we mimicked the light field when it's more complex, and the lookdown altered the properties of the polarized light it was reflecting so that it would be a better blend into its specific background at different times of day."

The lookdown's "polaro-cryptic" mirror skin functions by selectively reducing the degree of polarization and transforming the angle of polarization of the reflected light depending on the conditions.

The researchers' next task is to understand how the fish are accomplishing this feat.

Cummings said it might be an entirely passive process, with different elements of their skin automatically responding to the angle of the sunlight. Or, the lookdowns may aid in their camouflage by subtly altering their bodies' orientation relative to the sun, or by neurologically ramping up certain processes.

What the researchers discover about these mechanisms will be of particular interest to the Navy, which at present isn't as good as lookdowns at open ocean camouflage.

"From an evolutionary biologist viewpoint, I am always excited when evolution is one step ahead of humans," said Cummings. "There is this problem out there -- how to blend in to this environment, and though we haven't quite solved it yet, an animal has. We can identify these basic biological strategies, and perhaps materials scientists can then translate them into useful products for society."



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New way fish camouflage themselves in the ocean discovered

New way fish camouflage themselves in the ocean discovered

The researchers found that lookdown fish camouflage themselves through a complex manipulation of polarized light after it strikes the fishes' skin. In laboratory studies, they showed that this kind of camouflage outperforms by up to 80 percent the "mirror" strategy that was previously thought to be state-of-the-art in fish camouflage.

The study was published this month in the Proceedings of the National Academy of Sciences (PNAS). The research was funded by the U.S. Navy, which has an interest both in developing better ocean camouflage technologies and in being able to detect such strategies if developed by others.

"The open ocean represents a challenging environment for camouflage," said Molly Cummings, associate professor of integrative biology in the College of Natural Sciences. "There are no objects to hide behind in three-dimensional space, so organisms have to find a way to blend in to the water itself."

For the past few decades the assumption has been that the optimal camouflage strategy for open ocean fish is to reflect sunlight like a mirror. Many fish, including the lookdown, have reflective skin elements that can act like mirrors.

Such a strategy works well for certain aspects of light, such as color and intensity, which tend to be distributed homogenously in the region surrounding the fish. The mirror strategy is not optimal, however, when light is polarized, which occurs when individual waves of light align parallel to one another.

"In the polarized light field, there is a lot of structure in the open ocean," said physicist Parrish Brady, a postdoctoral associate in Cummings' lab. "Humans can't see it, but more than 60 different species of fish have some degree of polarization sensitivity. They can perceive the structure in the light."

The contours of the polarized light field in the open ocean environment are constantly changing except at noon, when the sun is directly overhead. A fish needs to do more than deploy the straight mirror strategy in order to stay camouflaged. Cummings hypothesized that perhaps nature had evolved a strategy to do just that.

She and Brady caught some lookdowns, which are known as good camouflagers. In tanks in the lab, they simulated the sun passing over the ocean during the course of a day, and they used a custom-built polarimeter to measure how the lookdowns reflected the polarized light.

They found that the lookdowns were able to manipulate their reflective properties in ways that were close to the theoretical optimum and far better than a standard mirror.

"The nifty thing is when we mimicked the light field when the sun is overhead, as it would be at noon, the fish just bounced back that light field," said Cummings. "It acted like a mirror. Then we mimicked the light field when it's more complex, and the lookdown altered the properties of the polarized light it was reflecting so that it would be a better blend into its specific background at different times of day."

The lookdown's "polaro-cryptic" mirror skin functions by selectively reducing the degree of polarization and transforming the angle of polarization of the reflected light depending on the conditions.

The researchers' next task is to understand how the fish are accomplishing this feat.

Cummings said it might be an entirely passive process, with different elements of their skin automatically responding to the angle of the sunlight. Or, the lookdowns may aid in their camouflage by subtly altering their bodies' orientation relative to the sun, or by neurologically ramping up certain processes.

What the researchers discover about these mechanisms will be of particular interest to the Navy, which at present isn't as good as lookdowns at open ocean camouflage.

"From an evolutionary biologist viewpoint, I am always excited when evolution is one step ahead of humans," said Cummings. "There is this problem out there -- how to blend in to this environment, and though we haven't quite solved it yet, an animal has. We can identify these basic biological strategies, and perhaps materials scientists can then translate them into useful products for society."


Welcome to SUV System Ltd!

SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.

We have built up long term business relationship with about many companies which are stockers and authorized agents. we have a steady and reliable supply to meet customer's demands to the greatest extent .Confidently, we are able to lower your cost and support your business with our years of professional service.

SUV System Ltd is Electronic Components Distributor Supplies,Find Quality Electronic Components Supplies Products IC(Integrated Circuits),Connectors,Capacitor,Resistors,Diodes,Transistors,LED at Suvsystem.com. Sourcing Other Energy, Environment, Excess Inventory Products from Manufacturers and Suppliers at Suvsystem.com

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Blood vessels in the eye linked with IQ, cognitive function

Blood vessels in the eye linked with IQ, cognitive function

June 3, 2013 — The width of blood vessels in the retina, located at the back of the eye, may indicate brain health years before the onset of dementia and other deficits, according to a new study published in Psychological Science, a journal of the Association for Psychological Science.






Research shows that younger people who score low on intelligence tests, such as IQ, tend to be at higher risk for poorer health and shorter lifespan, but factors like socioeconomic status and health behaviors don't fully account for the relationship. Psychological scientist Idan Shalev of Duke University and colleagues wondered whether intelligence might serve as a marker indicating the health of the brain, and specifically the health of the system of blood vessels that provides oxygen and nutrients to the brain.

To investigate the potential link between intelligence and brain health, the researchers borrowed a technology from a somewhat unexpected domain: ophthalmology.

Shalev and colleagues used digital retinal imaging, a relatively new and noninvasive method, to gain a window onto vascular conditions in the brain by looking at the small blood vessels of the retina, located at the back of the eye. Retinal blood vessels share similar size, structure, and function with blood vessels in the brain and can provide a way of examining brain health in living humans.

The researchers examined data from participants taking part in the Dunedin Multidisciplinary Health and Development Study, a longitudinal investigation of health and behavior in over 1000 people born between April 1972 and March 1973 in Dunedin, New Zealand.

The results were intriguing.

Having wider retinal venules was linked with lower IQ scores at age 38, even after the researchers accounted for various health, lifestyle, and environmental risk factors that might have played a role.

Individuals who had wider retinal venules showed evidence of general cognitive deficits, with lower scores on numerous measures of neurospsychological functioning, including verbal comprehension, perceptual reasoning, working memory, and executive function.

Surprisingly, the data revealed that people who had wider venules at age 38 also had lower IQ in childhood, a full 25 years earlier.

It's "remarkable that venular caliber in the eye is related, however modestly, to mental test scores of individuals in their 30s, and even to IQ scores in childhood," the researchers observe.

The findings suggest that the processes linking vascular health and cognitive functioning begin much earlier than previously assumed, years before the onset of dementia and other age-related declines in brain functioning.

"Digital retinal imaging is a tool that is being used today mainly by eye doctors to study diseases of the eye," Shalev notes. "But our initial findings indicate that it may be a useful investigative tool for psychological scientists who want to study the link between intelligence and health across the lifespan."

The current study doesn't address the specific mechanisms that drive the relationship between retinal vessels and cognitive functioning, but the researchers surmise that it may have to do with oxygen supply to the brain.

"Increasing knowledge about retinal vessels may enable scientists to develop better diagnosis and treatments to increase the levels of oxygen into the brain and by that, to prevent age-related worsening of cognitive abilities," they conclude.



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2013年6月3日星期一

SMIC forms joint venture for 28-nm chip production

SMIC forms joint venture for 28-nm chip production


LONDON – As expected Semiconductor Manufacturing International Corp. (Shanghai, China) has announced plans to form a joint venture in Beijing, China, as part of its expansion of manufacturing in the capital.

SMIC and its subsidiary SMIC Beijing are entering into the joint venture with Beijing Industrial Development Investment Management Corp. (BIDIMC) and Zhongguancun Development Group (ZDG). SMIC will be responsible for managing the daily operations of the joint venture called Northern SMIC Semiconductor Manufacturing (Beijing) Co. Ltd., according to reports.

BIDIMC is a state-owned company with all its capital contributed by Beijing State-owned Assets Management Co., Ltd. ZDG represents the Zhongguancun Science Park in Beijing.

The total investment for Northern SMIC is estimated to be $3.59 billion with an initial capitalization of $1.2 billion contributed by the parties in the form of registered capital. Of the initial funding SMIC and SMIC Beijing have agreed to contribute $660 million or 55 percent and ZDG and BIDIMC are set to contribute 45 percent or $540 million. The remaining money is to be funded through loans, further funding and cash flow, SMIC said.

A year ago, in May 2012, SMIC announced it had reached a deal to establish a joint venture to execute on SMIC Beijing's second phase of expansion. At that time SMIC said the deal would result in a wafer fab to be located adjacent to SMIC Beijing's 300-mm wafer fab in Beijing.

The latest announcement did not explicitly mention a wafer fab but said that "depending on the environment in which the joint venture company operates and market conditions," the joint venture is expected to establish and build up a manufacturing capacity of 35,000 wafer starts per month with a focus on 45-nm and finer technologies.


Related links and articles:

www.smics.com

News articles:

SMIC CEO details foundry plans

SMIC gets government backing for second Beijing fab

ST to deny rivals FDSOI access

SMIC posts record sales





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SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.

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SMIC forms joint venture for 28-nm chip production

SMIC forms joint venture for 28-nm chip production


LONDON – As expected Semiconductor Manufacturing International Corp. (Shanghai, China) has announced plans to form a joint venture in Beijing, China, as part of its expansion of manufacturing in the capital.

SMIC and its subsidiary SMIC Beijing are entering into the joint venture with Beijing Industrial Development Investment Management Corp. (BIDIMC) and Zhongguancun Development Group (ZDG). SMIC will be responsible for managing the daily operations of the joint venture called Northern SMIC Semiconductor Manufacturing (Beijing) Co. Ltd., according to reports.

BIDIMC is a state-owned company with all its capital contributed by Beijing State-owned Assets Management Co., Ltd. ZDG represents the Zhongguancun Science Park in Beijing.

The total investment for Northern SMIC is estimated to be $3.59 billion with an initial capitalization of $1.2 billion contributed by the parties in the form of registered capital. Of the initial funding SMIC and SMIC Beijing have agreed to contribute $660 million or 55 percent and ZDG and BIDIMC are set to contribute 45 percent or $540 million. The remaining money is to be funded through loans, further funding and cash flow, SMIC said.

A year ago, in May 2012, SMIC announced it had reached a deal to establish a joint venture to execute on SMIC Beijing's second phase of expansion. At that time SMIC said the deal would result in a wafer fab to be located adjacent to SMIC Beijing's 300-mm wafer fab in Beijing.

The latest announcement did not explicitly mention a wafer fab but said that "depending on the environment in which the joint venture company operates and market conditions," the joint venture is expected to establish and build up a manufacturing capacity of 35,000 wafer starts per month with a focus on 45-nm and finer technologies.


Related links and articles:

www.smics.com

News articles:

SMIC CEO details foundry plans

SMIC gets government backing for second Beijing fab

ST to deny rivals FDSOI access

SMIC posts record sales





Welcome to SUV System Ltd!

SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.

We have built up long term business relationship with about many companies which are stockers and authorized agents. we have a steady and reliable supply to meet customer's demands to the greatest extent .Confidently, we are able to lower your cost and support your business with our years of professional service.

SUV System Ltd is Electronic Components Distributor Supplies,Find Quality Electronic Components Supplies Products IC(Integrated Circuits),Connectors,Capacitor,Resistors,Diodes,Transistors,LED at Suvsystem.com. Sourcing Other Energy, Environment, Excess Inventory Products from Manufacturers and Suppliers at Suvsystem.com

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The greatest place to be a Martian: Australia?

The greatest place to be a Martian: Australia?

May 31, 2013 — Would Martians feel at home in Australia? Recent research has proven that if Martians took a holiday to Australia they might feel more at home than you'd think. Associate Professor Patrice F. Rey (University of Sydney) has recently exposed a unique set of attributes suggesting that the Australian red centre could be a close analogue for the surface of the red planet -- and how this unusual weathering has led to the formation of Australia's opals.






Precious opal, Australia's national gemstone, has been mined from the red dirt of central Australia for over a century. Its formation at shallow depths, and why it can be found in central Australia -- yet hardly anywhere else on Earth -- has remained a mystery. In this recent paper published in the Australian Journal of Earth Sciences, Associate Professor Patrice Rey, from the University's School of Geosciences, explains that the formation of Australian opal was due to an extraordinary episode of acidic weathering during the drying out of the central Australian landscape that followed the regression of the Eromanga Sea 100 years ago.

On Earth, regional acidic weathering is rare. Interestingly, acidic oxidative weathering has been documented at the surface of Mars, which shares an intriguing set of attributes with the Great Artesian Basin. These attributes include similar sandstones, a long episode of drying out leading to the formation of clay and opaline silica, and last but not least the same surface colour. This latest research suggests that the Australian red centre could well be the best regional terrestrial analogue for the surface of the red planet. Could it be that Australia may be home to Martians in the not too distant future?



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Dairy's carbon footprint: Flatulence tops the list

Dairy's carbon footprint: Flatulence tops the list

In 2007, Americans consumed approximately 17.4 million metric tons of fluid milk -- milk consumed as a drink or with cereal, rather than milk used in dairy products such as cheese, yogurt and ice cream. The dairy industry has set a goal of 25 percent reduction in greenhouse gas emissions by 2020.

The U of A researchers' "cradle-to-grave" life-cycle analysis of milk will provide guidance for producers, processors and others in the dairy supply chain and will help these stakeholders reduce their environmental impact while maintaining long-term viability.

"Based in part on growing consumer awareness of sustainability issues in our food supply chain, the U.S. dairy industry is working to further improve the environmental performance of its production processes and supply chain in a way that is also economically sustainable," said Greg Thoma, professor of chemical engineering. "Our analysis provides a documented baseline for their improvement efforts. It is a source for understanding the factors that influence environmental impact."

Thoma and an interdisciplinary team of U of A researchers looked at all facets and stages of milk production, from the fertilizer used to grow the animal's feed to waste disposal of packaging after consumer use.

Specifically, their life-cycle analysis focused on seven areas:

-- farm production and processes

-- farm-to-processor transportation

-- processor operations, packaging and distribution

-- retail operations

-- consumer transportation and storage

-- post-consumer waste management

-- overall supply-chain loss and waste

The researchers found that for every kilogram of milk consumed in the United States per year, 2.05 kilograms of greenhouse gases, on average, are emitted over the entire supply chain to produce, process and distribute that milk. This is equivalent to approximately 17.4 pounds per gallon. The greenhouse gases were measured as carbon dioxide equivalents and included methane, refrigerants and other gases that trap radiation.

The largest contributors were feed production, enteric methane -- gas emitted by the animal itself -- and manure management.

The researchers identified many areas where the industry can reduce impact within feed and milk production, processing and distribution, retail and the supply chain. They focused on farms, where processes for feed production, handling of enteric methane and manure management varied greatly and therefore represent the greatest opportunities for achieving significant reductions.

The researchers suggested widespread nutrient management strategies that link inorganic fertilizer use with the application of manure for crop production. They recommended dry lot and solid storage systems as preferred management strategies, rather than anaerobic lagoons and deep bedding. Methane digesters, which biologically convert manure to methane and capture it as an energy source, should be a high priority for larger farm operations, Thoma said.

"Methane digesters have great potential as a way to capture and utilize methane, which is natural gas, that is otherwise lost to the atmosphere," he said.

At the processor and distribution level, greater emphasis on truck fleet-fuel usage and consumption of electricity will reduce emissions, the researchers said. Implementing standard energy-efficiency practices focused on refrigeration and compressed-air systems, motors and lighting will also lead to reduction. Likewise, processor plant fuel reductions can be achieved through improved steam systems and continued energy-efficiency improvements in other operating practices.

With packaging, emissions reductions could come from improved bottle designs resulting in less material use. Specifically, changing the bottle cap manufacturing process from injection molding to thermoforming may lower environmental impact. Similar suggestions have already been made for yogurt packaging and containers. Finally, the researchers recommended a careful examination of trucking transport distances to realize greater optimization and efficiency of routes. They also suggested transport refrigeration systems that use fewer refrigerants.

The U of A researchers -- Rick Ulrich, professor of chemical engineering; Darin Nutter, professor of mechanical engineering; Jennie Popp, professor of agricultural economics and agribusiness; and Marty Matlock, professor of biological and agricultural engineering, in addition to Thoma -- partnered with researchers at Michigan Technological University.

Their study was published as a special issue, "Carbon and Water Footprint of U.S. Milk, From Farm to Table," of the International Dairy Journal in April.


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