Tag: "replacement" at biology news
Of lice and men
...he "diffusion wave model." (1) The replacement
model says that after primitive human ancestors fi...del falls between the other two theories. Like the replacement
theory, it says modern humans arose in Africa and spread across the world, Rogers says. Like the mul...
Good news: As you age, leg blood vessels adapt so you can still exercise without fainting
...ing similar experiments in women (both on estrogen replacement
and not). They plan to study the mechanisms underlying age-related changes in vascular responsiveness to sympathetic stimulation; and to examine the importance of sympathetic outflow in regulating vascular tone and oxygen delivery to exercising musc...
Story tips from the Department of Energy's Oak Ridge National Laboratory, October 2004
...an expected. The studies suggest that the complete replacement
of water-damaged building materials may not always be necessary. ORNL conducted the research in collaboration with Tuskegee University in Alabama, a state that recently experienced its own high water problems associated with Hurricane Ivan. [Contact:...
Rice engineer wins prestigious Annunzio Award
...ng techniques to use a patient's own cells to grow replacement
blood vessels in the lab -- blood vessels that can...r matrix and provide a structure for the growth of replacement
blood vessels. To promote tissue growth, the scaffolds contain biochemicals that promote cell adhesi...
Health, food, new technologies featured during ACS meeting Oct. 17-20 in Peoria, Ill.
...that act as preservatives, also shows promise as a replacement
for some synthetic antioxidants widely used as preservatives in salad dressings and other foods, they say. Dark honey is generally thought to contain higher levels of antioxidants than the lighter varieties, according to the scientists. ( AGFD/AOCS 2...
Safety and immunogenicity data available for new pertussis booster vaccine candidate for adolescents
...ithKline. "If approved, using a Tdap vaccine as a replacement
or alternative for the routine adolescent Td booster could offer important protection against pertussis, as well as diphtheria and tetanus, without an additional injection or doctor's office visit." Study Findings In this observer-blinded, randomiz...
First human trial of bioartificial kidney shows promise for acute renal failure
...patients with chronic renal failure as a long-term replacement
for kidney function. More testing is needed before that can become a reality, and any standard use of this therapy is still many years off. "The long-term goal, if this shows effectiveness in patients with end stage renal disease, is to build a fully...
Researchers grow sperm stem cells in laboratory cultures
... cells to replace diseased or injured tissue. The replacement
tissue might be used to help patients with spinal cord injury, or disorders like Parkinson's disease or heart disease. To conduct their study, Dr. Kubota and his colleagues began with mice that had been genetically altered to express green fluoresc...
New source for heart bypass replacement blood vessels: Fibrin-based TEVs
...ng, yet elastic -- and physiologically responsive replacement
blood vessels has been the subject of laboratory searches and experimentation for decades. The study, "Fibrin-based functional and implantable small diameter blood vessels," was written by Daniel D. Swartz and James A. Russell from the SUNY Buffalo ...
New program examines stem cells' potential to repair, replace damaged tissue
... these patients could one day be grown into needed replacement
organs and tissue. Each cell type has a distinct framework or matrix that will be used like the frame of a building to construct what's needed. "We are moving from doing transplantation, like renal transplantation, where we have taken tissue from an...
Army-funded effort examines androgen's role in bone loss
...women is androgen therapy, either through androgen replacement
using hormone drugs, or androgen replacement
combined with estrogen replacement. "You get a better response with combined treatment than...
Purdue researchers align nanotubes to improve artificial joints
...causes them to become loose and painful, requiring replacement
surgery. Aligning the nanotubes to further mimic natural bone also might provide more strength, Webster said. Researchers used two methods to align the tiny nanotube structures, which have diameters of about 60 nanometers. One nanometer is roughly th...
Neural crest stem cells in skin could provide alternative to embryonic stem cell use
therapy offers a novel and powerful medical techno...crest stem cells from adult hair follicles in cell replacement
therapy in selected instances," Sieber-Blum says. This may include, spinal cord injury, Parkinson's...
Baby songbirds and human infants learn sounds in similar ways
...rovided the first evidence of spontaneous neuronal replacement
in the adult vertebrate brain. A problem-solving approach may apply to other kinds of sensory motor learning beyond vocal learning, he added, suggesting that zebra finches may offer further insights into human learning. "I find it amazing that somet...
JCI table of contents, December 15 2004
... muscular atrophy. TITLE: Lentivector-mediated SMN replacement
in a mouse model of spinal muscular atrophy AUTHOR CONTACT: Mimoun Azzouz or Nicholas Mazarakis Oxford BioMedica Ltd., Oxford, United Kingdom. Phone: 01-865-78-30-00; Fax: 01-865-78-30-01; E-mail: firstname.lastname@example.org or n.mazarakis@oxfo...
Science's Breakthrough of the Year: Salty, acidic soup could have supported life on Mars
...diseases or eventually produce genetically matched replacement
cells for patients. Banner Year for Condensates: With an understanding of how to chill the two basic types of atoms into a single quantum state or "condensate" under their belts, researchers got down to probing these strange forms of matter in 2004...
Discovery of first demethylase molecule, a long-sought gene regulator
... reversed by the destruction of histones and their replacement
with new ones. Part of the reason scientist believed this was that no one had isolated a demethylase, despite an active search. The Shi lab was not among those in the hunt, but they stumbled onto the demethylase while probing the function of a new ...
Shedding feathers early may enhance sex appeal, new songbird study shows
...mithsonian Environmental Research Center). "Their replacement
feathers, grown en route, are less colourful than those of birds that had time to molt before migration, which may put them at a disadvantage in attracting females the following breeding season," says Dr. Norris. "Both findings that molting in some ...
A new New Year's reason to work out: Exercise improves three measures of heart protection
...ETHESDA, Md. (Jan. 20, 2005) For decades, hormone replacement
therapy (HRT) was prescribed for postmenopausal wo... study, "Relationship of physical fitness, hormone replacement
therapy and hemostatic risk factors in postmenopausal women," was conducted by Linda M. Szymanski, C...
PGA on a tour under the skin
...er of infections in people with prosthetic joints, replacement
heart valves, and intravenous catheters, and antibiotic resistance makes it tough to battle. Moreover, the mechanism through which the organism becomes so pathogenic once the protective barrier of the skin is removed remains unclear. In their stud...
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