Birds Sing The 'Story Of Their Lives,' Theorize Duke Biologists
... largely unansweredquestion until now: how exactly does a female bird benefit from choosing a matebased on his song. Early theories had held that the elaborate male bird song,like other exaggerated male mating traits, was an arbitrarily chosen symbolictrait. Such a trait would undergo a runaway hypertroph...Research Sheds Light On How Plants Regulate Distribution Of Nutrients
... butthe roots are proliferating," Bush said. "How does the plantallocate resources? "This finding is an important first step in understanding resourceallocation," he said. "I believe there are other regulators here. My suspicion is that there are other control pathways that are integrating with this sy...Wistar Research Yields Information About Colorectal Cancer Cell Invasion
...about the function of the GA733 antigen. Not only does it sit onthe surfaces of ovarian, lung and most epithelial tumors, but it also isexpressed by normal tissues. "It is ironic," says Dr. Herlyn, "that immunotherapy works against an antigenthat controls metastases and kills tumor cells. Obviously, con...... by many groups that mammalian CRF-R1 does not discriminate between the naturally occurring CRF analogs mentioned above. On the basis of this difference, it was possible to identify the ligand-specific domain of frog CRF-R1 and to determine whether mamm...Some AIDS Patients May Show Resistance To Sulfa Drugs
...g for preventing and treating pneumocystis, but it does fail in some cases. "The importance of this study is that it documents mutations in pneumocystis in HIV/AIDS patients," says Powell Kazanjian , M.D., associate professor of internal medicine and director of the HIV/AIDS Program in the U-M Health Sy...Cystic Fibrosis Gene Protects Against Typhoid Fever
...gh rates of childhood mortality, thedefective gene does not remain in the gene pool," says Dr. Pier. "The...lung. When CFTR protein is abnormal or missing, it does not bind and ingest thisbacterium, and lifelong infections are thus established in many individuals ...Composting Livestock Waste Provides Benefits
...able cost savings," Hawkins says. The composting does not attract flies and other insects as manure does. The potential for nutrient runoff resulting in pollution is greatly reduced. Weeds and pathogens in manure are destroyed before they are applied to the fields. The compost is a more uniform ma...Study Of Sulfides In Bacteria Casts Doubts On Evidence Of Life In Martian Meteorite ALH84001
... down intopyrite and pyrrhotite, but that reaction does not occur when the bacteria are present. The team's research finding contradicts an earlier study that found pyrite and pyrrhotite present in thebacteria. As no subsequent study has been able to duplicate this result, the current team posits that ea...High-Pressure Chambers Could Prevent Paralysis After Spinal Cord Injury
...The National Spinal Cord Injury Statistical Center does not keepstatistics on what proportion of spinal cord injuries are limited to bruising,but James said "the vast majority" fall into this category. A number of very positive animal studies on the use of hyperbaric oxygentherapy in treating spin...... immediately take advantage of the information or does it firsthave to develop specialized neural hardware or connections?" "This relates to questions of human evolution and to understanding howneurons know how or what to connect to. In addition, we are interested in how anew capability or mutati...The Distinctive Sound Of Cholesterol
...ry is clean, there is no turbulence when the heart does not pump (diastolic cycle), and when the velocity of blood is low. But when cholesterol deposits are present, the flow is turbulent during both cycles of a heartbeat. An expert can hear the difference. Savic has developed a number of computer system......cluded the idea that the important thing that Fhit does in the cell is tocleave ApppA," he says. However, Dr. Brenner says that because the altered Fhitbinds the compound but can't cleave it, "the function of Fhit is to signal thepresence of the compound to other proteins in the cell." The work su......on the specific dynamics of proteins, does specific dynamics have to compromise between the requirements of stability and those of function, and has specific dynamics adapted to different conditions of solvent environment, temperature or pressure? Evid......ing the improvement of brain function does not affect the loss of function resulting from disuse, it has to be concluded that the two forms of plasticity proceed independently of each other. The essential role of proteases - known to be involved in growth mechanisms ...15 Drugs, Dyes And Other Chemicals Newly Listed As Known Or Likely Human Carcinogens
...d, "The reportidentifies public health hazards but does not in-and-of-itself restrictsubstances. Never-the-less, regulatory agencies and Congress take noteand may take action in cases where the substances are not alreadyregulated. "The report," he continued, "is not necessarily a condemnation, in thatsome...Consumer-Oriented Environmental Policy Unsuccessful
...inues to increase. The rapid growth in consumption does seem to be temperedby increased concern about the impending depletion of natural resources and agreater understanding of environmental problems. But to achieve any real effect,people's life-styles would in fact need to change drastically. The develop...... weeks after birth. The thyroid gland does not develop normally and serum concentration of the T4 hormone is very reduced as compared to wild-type mice. Treatment of the mutant mice with thyroxin prolong their survival up to six months, indicating that lethality is d...Press Events At Spring Meeting
...ednesday, May 27 10:30 AM. The geodynamo: how does Earth produce its magnetic field? Pressconferenc...ofthe largest unsolved problems in geophysics: how does Earth produce its internalmagnetic field? Dr. Gary A. Glatzmaier of the Los Alamos National Laborato...DFG To Fund Six New Research Units
...iving creatures perceive their environment and how does newly acquired knowledgeguide their spatial action? This is the question that neurobiologists at Tbingen Universityintend to look into in the research unit Perception and action in space: neurobiological andtheoretical basis. Clinical studies, an ana...How does our brain cope with the enormous flux of information thatbombards our senses? One important neural strategy is the ability to"cluster," or categorize, data and thus make sense of the world aroundus. Prof. Eytan Domany, head of the Weizmann Institut...