Tag: "reproduce" at biology news

Study of planarians offers insight into germ cell development

... cell. " S. mediterranea also has the ability to reproduce asexually: It clones itself by means of fission. In looking at nanos in asexual individuals of this species, the researchers made the surprising discovery that these asexual individuals also express nanos and produce germ cells. Some other mechanism,...

Everything starts with recognition

...ls, plants and other living systems - move, sense, reproduce and accomplish the processes that keep all living creatures alive. A very common example of recognition can be experienced in daily life whenever one meets someone and shakes right hands. In principle, one can also shake left hands; the fact that w...

Antioxidant found in many foods and red wine is potent and selective killer of leukemia cells

... toxic even in purified form. Therefore, if we can reproduce these anti-cancer effects in animal studies, this will present a very promising approach for treating a variety of human leukemias and, perhaps, lymphomas as well....

Jefferson researchers' discovery may change thinking on how viruses invade the brain

...n, but did not cause disease. The virus ability to reproduce was greatly diminished. "What we found has nothing to do with transport," Dr. Schnell says. "We saw that the virus was weakened if we removed the LC8 binding site and viral replication and transcription were affected. But we didnt find a difference...

Why some aphids can't stand the heat

... Undergraduate Biology Research Program. Aphids reproduce asexually, so juveniles are clones of their mother...ow well the host does, how well it can survive and reproduce at different temperatures," Moran said. When a bacterial cell reproduces, a new DNA molecule is c...

Amur leopard still on the brink of extinction, scientists say

...le leopards would live in the same amount of land, reproduce and nourish their cubs. "Maybe this is the reason why leopards practically completely disappeared from the Korean Peninsula and north-east China," said Dr. Pikunov. "At the beginning of the past century, the Far Eastern leopard was a common species...

Sleep enforces the temporal sequence in memory

...d recall, but only when the students were asked to reproduce the learned words in forward direction. This finding shows that sleep associated consolidation of memories enforces the temporal structure of the memorized episode that otherwise might be blurred to a timeless puzzle of experiences....

Evolution of symbiosis

...ying a gene that causes one to lose the ability to reproduce at high temperatures? A clue to the answer comes from the wild populations in which the mutation was not found: those living in Arizona and Utah. Could the bacterial mutation confer a competitive advantage that's only relevant in cooler climates? T...

First impressions: Computer model behaves like humans on visual categorization task

.... "This is the first time a model has been able to reproduce human behavior on that kind of task." The study, issued on line in advance of the April 10, 2007 Proceedings of the National Academy of Sciences (PNAS), stems from a collaboration between computational neuroscientists in Poggio's lab and Aude Oliva, ...

One membrane, many frequencies

...hough quite sophisticated, still do not faithfully reproduce sound as hearing people perceive it. New findings at the Weizmann Institute of Science shed light on a crucial mechanism for discerning different sound frequencies and thus may have implications for the design of better hearing aids. Research by Dr...

Ewwwww! UCLA anthropologist studies evolution's disgusting side

...d by them during ovulation would be more likely to reproduce and to have healthy children."...

Common fungicide causes long-term changes in mating behavior

...rmacy. That will have an impact on your ability to reproduce and could take you out of the gene pool. Vinclozolin causes changes in the male rats germline cells (for example, sperm). The fungicide does not directly alter DNA, but instead causes changes in elements that regulate genes. This is known as an epi...

Mitochondrial genes move to the nucleus -- but it's not for the sex

...mportant clue in flowering plants. "Plants that reproduce clonally or are capable of self-pollinating have transferred more genes from the mitochondrion to the nucleus," said graduate student Yaniv Brandvain, lead author of the paper. That discovery, Brandvain explained, is unexpected. The most obvious b...

Aging boosts chances that a family line will be long-lived

...hances that the individual's line will continue to reproduce for many generations to come, a new study indicates. The earliest organisms, single-celled creatures called prokaryotes, which include bacteria, probably did not age but rather divided damaged material equally among new cells. There was not a pare...

Smithsonian scientists discover new marine species in eastern Pacific

...scovered new species of ribbon worms that live and reproduce among crab eggs. These worms can be important pests of commercial species, but they are often overlooked because they are smaller than the eggs themselves. "All the tedious dissections and microscope preparations done on a rolling, vibrating ship hav...

Too much weight spells double trouble for couples trying to conceive

...esity epidemic continues, this reduced capacity to reproduce could become a serious public health problem. Further research in this area is needed, she said. Sub-fertility (or subfecundity) is normally defined as a waiting time to pregnancy of more than 12 months from the time a couple starts to have unprote...

A key to male fertility

...was astonishing. The mice without SHP were able to reproduce about a week earlier than the controls. This is a considerable difference since, as a general rule, male mice are sexually mature at 7 or 8 weeks. In addition, regardless of increased activity in the pituitary gland, mice without SHP produce more t...

New guide to sharks and rays of Indonesia

... critical to managing shark and ray species, which reproduce relatively slowly and are extremely vulnerable to over-fishing. It provides the foundation for estimating population sizes, assessing the effects of fishing and developing plans for fisheries management and conservation." The survey represents the fi...

The cost of keeping eggs fresh for mother cockroaches

...se nutrients herself and taking the chance she can reproduce later." The group is currently investigating this trade-off arising from a conflict over food or sex. Although this is a new twist in the conflict over food or sex, the result is a familiar one in evolutionary biology; it is hard to be best at everyt...

The insides of clouds may be the key to climate change

...these models do not have high enough resolution to reproduce observations. "We know that aerosol effects on clouds need to be included in climate models," Penner said, "but we need more research to reach optimum predictive properties for climate models." ...

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