Tag: "stems" at biology news

Purdue genetic discovery may aid plants and human medicine

...on of a protein, PIN1, at the base of cells in the stems of plant embryos, Murphy said. Because PIN1 is an essential part of the system that transports the growth hormone auxin, dislocation of the protein impairs flow of the hormone through the plant. This alters how the plants develop and respond to facto...

Lithium shows promise against Alzheimers in mouse model

...ice and cells. By blocking the enzyme, lithium stems the accumulation of beta amyloid, which forms Alzheimer's plaques, scientists funded by the National Institutes of Health (NIH) report in the May 22, 2003 Nature. Inhibiting the enzyme, glycogen synthase kinase 3 alpha (GSK-3 alpha), also blocks fo...

Ovarian tumor cell sensitivity then resistance - to chemotherapy linked to genetic abnormality

...w to counter these cellular shifts. The new study stems from D'Andrea's research in Fanconi anemia, an inherited condition that places children at risk for bone marrow failure early in life and various forms of cancer as they get older. The disease is caused by a defect, or mutation, in any of seven genes...

Fetus heart races when mom reads poetry

...dule in the brain as has been assumed, but instead stems from the interaction of the fetus with its environment. Along with researchers at Zhejiang University, China, Dr. Kisilevsky tested 60 fetuses at term. Thirty fetuses were played a two-minute audiotape of their own mother reading a poem and 30 fetuse...

St. Jude researchers reverse blood disease using genetically modified stem cells

...sed by the large number of defective hematopoietic stems cells (HSCs) producing faulty red blood cells in beta-thalassemia or sickle cell disease. The large numbers of defective HSCs thwart attempts by gene therapy to reverse the disease. HSCs are parent cells in the bone marrow that give rise to blood cel...

What makes the body absorb too much iron?

...ow, most researchers have thought that the problem stems from a faulty intestinal signal that there is too little iron, leading cells in the intestines to produce more transport proteins that draw iron inside. By combining two approaches, the EMBL and Harvard teams have now rewritten this model. Their stu...

Diet study focus of TAES research in effort to help save giant panda

...as have teeth capable of eating not just the leafy stems that extrude from the stalk, Tolleson said. "It's interesting. They eat about 18 hours a day, and then sleep the rest. They grab a hand full of it, then hold it and eat it," he said. "They can also grab a stalk and crack and crunch. They have teeth ...

Scientists discover unique source of stem cells

... Today's finding, as so often happens in science, stems from a chance interaction. As Shi recounts, it happened one evening when his then-six-year-old daughter, Julia, asked for help in pulling out a loose baby tooth. "Once it was out, we sat and looked carefully at the tooth," recalled Shi, a pediatric...

DHEA supplement shows no effect on Alzheimer's disease

...f much debate among researchers." Interest in DHEA stems from the findings that the level of DHEA in the body peaks between ages 20 and 30 and then decreases progressively with age, as well as other studies showing that DHEA improves memory in mice. Studies on the levels of DHEA in the blood of Alzheimer's...

Plant pathologists find growing number of plants affected by sudden oak death

...r SOD. SOD appears to use the leaves, branches and stems of these plants to reproduce, resulting in lesions and leaf discoloration. It doesn't kill the host plant outright, but scientists say repeated SOD infections are likely to weaken the plant over time, negatively impacting its growth and making it sus...

Myosin V, the molecular motor, moves in monkey-bar motion

...ed by neurological deficits and a lack of pigment, stems from non-functioning myosin V. Goldman and his colleagues were able to study the hand-over-hand motion of a single myosin motor in action thanks to an innovative microscopic technique created by Joseph N. Forkey, PhD, a post-doctoral researcher ...

Scientists debate meaning of 40-million-year-old primate fossils in Nature

...n Afro-Arabia. Martin's alternative interpretation stems from statistical models indicating that gaps in the fossil record have led scientists to underestimate divergence times throughout the primate evolutionary tree. Furthermore, new molecular trees also indicate that primates originated much earlier tha...

Receptor could be target for cancer therapy

...l mice did not. Breyer's focus on the EP2 receptor stems from his long-standing interest in the biological effects of prostaglandins, a family of locally acting hormones produced by the cyclooxygenase (COX) enzymes. COX enzymes are the targets of aspirin and other non-steroidal anti-inflammatory drugs, wh...

Low amniotic fluid no risk to normal birth

...sor of gynecology and obstetrics. "Amniotic fluid stems from the baby's urine, and the urine results from good blood flow, so if we see low fluid we assume there probably is not good blood flow and the fetus is compromised. This study shows the fluid test is not as good as we thought, and there is most l...

For spinal cord injury patients, new insights for rehabilitation therapy

...erm SCI individuals will be increased. This belief stems from the fact that (1) animal research findings that endothelial function changes after long-term sympathectomy with a predominance of endothelin-1 release and a decrease in nitric oxide release; (2) after deconditioning of the leg muscles, oxygen de...

Blood banking systems improving in China, more progress needed

...n's interest in the country's blood banking system stems in part from her work with Jay Brooks Jackson, M.D., Ph.D., director of pathology at Johns Hopkins. As they studied ways to prevent HIV infection in Africa and Asia, poor blood banking and transfusion practices stood out as major obstacles to reducin...

Researchers begin to unlock genetic mysteries of Down syndrome

... Dr. Ruiz i Altaba's interest in chromosome 21 stems from his studies in developmental genetics. He is particularly interested in genes that determine patterns of development, such as Sonic hedgehog and Gli. His laboratory has linked defects in these genes to cancer and holoprosencephaly, a congenital ...

Genetic clash doubles schizophrenia risk

.... "Schizophrenia is a complex disorder that likely stems from a combination of several genetic and environmental factors. It is doubtful that Rh incompatibility alone causes the disorder." She encouraged Rh-negative women to take advantage of Rh-incompatibility prophylaxis, receive good prenatal care and r...

Scientists find insects can alter plant chemistry to help them find mates

...er season can recognize when they are on the right stems at the right time. The study is being published i...iders and beetles, requiring the wasps to find new stems amid the assorted plant debris. Males, they found, only choose plant species that are the same as th...

UCSF-led team reports new test improves detection of prions in animals

...sensitive test to detect infectious prion proteins stems from the fact that studies increasingly show that the bioassays traditionally used to detect whether animal tissue is infected are not sensitive enough, and therefore have likely misrepresented the frequency of animals being infected. In the current ...

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