ScienceDaily: Top Science News |
- Kangaroos and other marsupials: Climb to the pouch begins in utero
- A youthful 'star wreck': Youngest-known supernova remnants in our Milky Way galaxy
- Scientists produce cloned embryos of extinct frog
- We are still at risk of the plague, new study says
- Coffee, green tea, may help lower stroke risk
| Kangaroos and other marsupials: Climb to the pouch begins in utero Posted: 15 Mar 2013 05:27 PM PDT Scientists have visualized the short pregnancy of a small species of the kangaroo and wallaby family of marsupials, the tammar wallaby (Macropus eugenii), for the first time by high-resolution ultrasound. The study has shed light on a number of developmental events that are likely to be fundamental to all marsupials. These include a very rigid program of embryonic and fetal development with very little variation in pregnancy length, specialized movements of the endometrium that roll the embryo around the uterus prior to attachment, and climbing movements of the tiny fetus up to three days before birth. This latter finding is one of the earliest developmental behaviors observed in a mammal and prepares the immature young for the journey to its mother's pouch. |
| A youthful 'star wreck': Youngest-known supernova remnants in our Milky Way galaxy Posted: 15 Mar 2013 12:13 PM PDT While performing an extensive X-ray survey of our galaxy's central regions, NASA's Swift satellite has uncovered the previously unknown remains of a shattered star. Designated G306.3.9 after the coordinates of its sky position, the new object ranks among the youngest-known supernova remnants in our Milky Way galaxy. |
| Scientists produce cloned embryos of extinct frog Posted: 15 Mar 2013 12:10 PM PDT As part of a "Lazarus Project" to try to bring the Australian gastric-brooding frog back from extinction scientists have succeeded in producing early stage cloned embryos containing the DNA of the frog, which died out 30 year ago. Gastric-brooding frogs were unique in incubating their young in their stomachs. |
| We are still at risk of the plague, new study says Posted: 15 Mar 2013 12:09 PM PDT Today archaeologists unearthed a 'Black Death' grave in London, containing more than a dozen skeletons of people suspected to have died from the plague. The victims are thought to have died during the 14th century and archaeologists anticipate finding many more as they excavate the site. The Plague is by definition a re-emerging infectious disease which affects the lungs and is highly contagious, leading to mass outbreaks across populations. |
| Coffee, green tea, may help lower stroke risk Posted: 14 Mar 2013 03:01 PM PDT Green tea and coffee may help lower your risks of having a stroke, especially when both are a regular part of your diet. People who drank either green tea or coffee daily had about approximately 20~30 percent lower risk for one type of stroke, compared to those who seldom drank them. |
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