सोमवार, 28 अप्रैल 2014

सेहतनामा शोध की खिड़की से खगोल विज्ञान

सेहतनामा शोध की खिड़की से खगोल विज्ञान 

(१) ओमेगा थ्री वसीय अम्लों से भरपूर हैं अलसी के बीज (Flaxseeds ).खून में घुली चर्बी को काम करने तथा ब्लड प्रेशर को नियंत्रित रखने में इनकी बड़ी भूमिका रहती है। 


Researchers have found that using a protein blend of soy ,casein and whey after rigorous workout ensures the delivery of select amino acids -the building blocks of muscle -to the muscle for an hour longer than just whey.The study was in the Journal of Applied Physiology.

हाड़  कसरत के बाद सोया (सोयाबीन से बने खाद्य और पेय पदार्थ ),छेने या दही द्वारा छोड़ा गया पानी (तोड़ )और Casein का मिश्र पेशियों को एक घंटा भर ज्यादा देर तक सम्पुट  बनाये रहता है बरक्स  केवल छेने या दही के पानी के सेवन  से प्राप्त पोषण के। 

Whey vs. Casein
Cow’s milk is composed of carbohydrates and two main dairy proteins: casein and whey. When milk is coagulated, it automatically divides out the proteins into semi-solid lumps and a liquid portion. Casein is found in the lumps, or curds, whereas the whey protein is found in the liquid portion (5). The ratio of protein within a glass of milk is about 20% whey to 80% casein, which provides an optimal composition of readily available nutrients to replenish body fuel post-workout and keep energy levels up (5).

Whey is known as the “fast-acting” protein, meaning that the body can break it down and absorb the nutrients relatively quickly (1). In some cases, manufacturers break down whey even further into whey protein isolate, whey concentrate or whey powder, which are then sold in different forms as supplements. These lactose-free, concentrated protein supplements are absorbed at a quicker rate than casein.

Additionally, whey is high in indispensible (essential), branched-chain amino acids that the body cannot produce on its own and must derive from food (1).

This allows for quick uptake by the body (6). Some studies have found that whey protein supplements may be associated with an increase in muscle mass size and strength in some individuals as well (7).

Casein, often referred to as the “slow-acting” protein, takes slightly longer to digest as it slowly releases amino acids into the bloodstream (6). It contains a different amino acid profile than whey and is particularly high in the conditionally indispensible amino acid, glutamine (1). This is beneficial because, when the body is put under physiological stress, such as with endurance exercise, the body needs to derive glutamine from an outside source of food (1). The bottom line, however, is that both whey and casein are needed for proper nutrition.

Some supplements contain both whey and casein to allow the body to take full advantage of the different absorption rates (1,8). Additionally, the combined efforts are beneficial because whey works to stimulate protein synthesis whereas casein inhibits the breakdown of protein (9). Therefore, individual, isolated supplements of either whey or casein may not be the best option. 

Milk: Full or Low-Fat?
Research shows that low-fat dairy is more effective at protein synthesis and replenishing net muscle protein balance than high-fat dairy (6). One theory is that the fat is digested at a slower rate than carbohydrates and protein, and thus the fat slows down the delivery of carbohydrates and protein to tissues (6).

Furthermore, chronic use of low-fat milk as a post-exercise resistance training meal has been associated with a greater reduction in overall body fat, increased muscle growth and greater muscle mass maintenance than soy-based proteins (3,9). Table 1 lists whole-food examples of post-exercise snack options that provide the optimal balance of carbohydrates to proteins. Eat these snacks within 30mins after completing an exercise session for optimal glycogen and protein uptake. 

खगोल विज्ञान :शोध की खिड़की 

‘Close, cold neighbour of Sun found’

Astro-nomers have discovered the coldest star of its kind — as frosty as Earth’s North Pole — just 7.2 light years away. Using Nasa’s Wide-field Infrared Survey Explorer (WISE) and Spitzer Space Tele-scopes a Pennsylvania State University astronomer spotted the “brown dwarf” — a dim, star-like body.
Images from the space telescopes pinpointed the object’s distance at 7.2 light-years away, making it the fourth closest system to our Sun. “It is very exciting to discover a new neighbour of our solar system that is so close,” said Kevin Luhman, an associate professor of astronomy and astrophysics at Penn State. “In addition, its extreme temperature should tell us a lot about the atmospheres of planets, which often have similarly cold temperatures,” said Luhman. Brown dwarfs start their lives like stars, as collapsing balls of gas, but they lack the mass to burn nuclear fuel and radiate starlight.
The newfound coldest brown dwarf, named WISE J085510.83-071442.5, has a chilly temperature between minus 48 to minus 13 degrees Celsius. Previous record holders for coldest brown dwarfs were about room temperature. Although it is very close to our solar system, WISE J085510.83-071442.5 is not an appealing destination for human space travel in the distant future, researchers said.
“Any planets that might orbit it would be much too cold to support life as we know it,” Luhman said. “This object appeared to move really fast in the WISE data. That told us it was something special,” said Luhman. WISE was able to spot the rare object because it surveyed the entire sky twice in infrared light, observing some areas up to three times.
Cool objects like brown dwarfs can be invisible when viewed by visible-light telescopes, but their thermal glow, even if feeble, stands out in infrared light. Spitzer’s infrared observations helped to determine the frosty temperature of the brown dwarf.


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