Ice Protection
Mostrando 13-21 de 21 artigos, teses e dissertações.
-
13. The interleukin 1beta-converting enzyme, caspase 1, is activated during Shigella flexneri-induced apoptosis in human monocyte-derived macrophages.
Shigella, the etiological agent of bacillary dysentery, rapidly kills human monocyte-derived macrophages in vitro. Wild-type Shigella flexneri, but not a nonvirulent derivative, induced human macrophage apoptosis as determined by morphology and terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling (TUNEL). Shigella-mediated macrophage c
-
14. Water Relations and Low-Temperature Acclimation for Cactus Species Varying in Freezing Tolerance.
Opuntia ficus-indica and Opuntia streptacantha are widely cultivated cacti that can tolerate temperatures no lower than -10[deg]C, whereas Opuntia humifusa, which is native to southern Canada and the eastern United States, can tolerate -24[deg]C. As day/night air temperatures were decreased from 30/20 to 10/0[deg]C, the osmotic pressure increased 0.10 MPa fo
-
15. Protection against apoptosis by the vaccinia virus SPI-2 (B13R) gene product.
Vaccinia virus contains a gene, termed SPI-2 or B13R, that is closely related in its sequence to a potent inhibitor of apoptosis from cowpox virus (crmA). Infection by vaccinia virus protects HeLa cells against apoptosis that is induced by an immunoglobulin M antibody against the fas receptor or by tumor necrosis factor alpha. This effect is profoundly reduc
-
16. Human Parvovirus B19 Nonstructural (NS1) Protein Induces Apoptosis in Erythroid Lineage Cells
Infection of erythroid-lineage cells by human parvovirus B19 is characterized by a gradual cytocidal effect. Accumulating evidence now implicates the nonstructural (NS1) protein of the virus in cytotoxicity, but the mechanism underlying the NS1-induced cell death is not known. Using a stringent regulatory system, we demonstrate that NS1 cytotoxicity is close
American Society for Microbiology.
-
17. Hypothermic protection (26-25 degrees C) without perfusion cooling for surgery of congenital cardiac defects using prolonged occlusion.
Open heart surgery was performed without perfusion under deep hypothermia in 343 patients with congenital heart defects aged from 1 year 3 months to 44 years. Cooling to a temperature of 26-25 degrees C in the oesophagus was achieved by covering the body with crushed ice. The patients were maintained under superficial ether narcosis and they were given morph
-
18. Paleoproterozoic snowball Earth: Extreme climatic and geochemical global change and its biological consequences
Geological, geophysical, and geochemical data support a theory that Earth experienced several intervals of intense, global glaciation (“snowball Earth” conditions) during Precambrian time. This snowball model predicts that postglacial, greenhouse-induced warming would lead to the deposition of banded iron formations and cap carbonates. Although global gl
The National Academy of Sciences.
-
19. Wolffish antifreeze protein genes are primarily organized as tandem repeats that each contain two genes in inverted orientation.
The antifreeze protein genes of the wolffish (Anarhichas lupus) constitute a large multigene family of 80 to 85 copies, which can be classified into two sets. One-third of the genes were linked but irregularly spaced. The other two-thirds were organized as 8-kilobase-pair (kbp) tandem direct repeats that each contained two genes in inverted orientation; DNA
-
20. Immunoglobulin and specific-antibody synthesis in vitro by enteral and nonenteral lymphoid tissues after subcutaneous cholera immunization.
An in vitro culture technique with synthesis of 14C-labeled protein has been used to study immunoglobulin and specific-antibody formation by spleen, mesenteric lymph nodes, Peyer's patches, and small intestine of rabbits, which were immunized twice subcutaneously with Vibrio cholerae lipopolysaccharide (LPS) and enterotoxin; saline-injected rabbits served as
-
21. The freeze-thaw stress response of the yeast Saccharomyces cerevisiae is growth phase specific and is controlled by nutritional state via the RAS-cyclic AMP signal transduction pathway.
The ability of cells to survive freezing and thawing is expected to depend on the physiological conditions experienced prior to freezing. We examined factors affecting yeast cell survival during freeze-thaw stress, including those associated with growth phase, requirement for mitochondrial functions, and prior stress treatment(s), and the role played by rele