Potential mechanisms of cold-induced myocardial ischaemia are sympathetically mediated coronary vasoconstriction and/or catecholamine-induced increases in cardiac work. To examine these parameters, 11 human volunteers were each studied on one day with, and on another day without, beta-adrenoceptor blockade. On each day, warm (37 degrees C) saline (control) and cold (4 degrees C) saline (hypothe...

The Welding in cold formed areas is not only an open question for statically loaded sections (brittle fracture) but also for dynamically loaded structures (fatigue resistance). A lot of structures are subjected to dynamic loadings and unfortunately very little information about the influence of welding in the cold formed areas on fatigue resistance is available. In order to establish the fatigu...

1. BULA, R. J. & D. SMITH. 1954. Cold resistanice & chemical composition in overwintering alfalfa, red clover, & sweet clover. Agron. J. 46: 397-401. 2. BULA, R. J., D. SMITH, & H. J. HODGSON. 1956. Cold resistance in alfalfa at two diverse latitudes. Agron. J. 48: 153-156. 3. JANSSEN, G. 1929. The relationship of organic root reserves & other factors to the permanency of alfalfa stands. J. Am....

Dense Silicon nitride was investigated to determine the effect of its microstructural parameters and densification on thermo-mechanical properties and thermal stress resistance to fracture initiation during a hot or cold mechanical and thermal shock testing. The different materials and microstructures were obtained by changing the parameters such as the type of the powder, additive, forming p...

Recent studies have demonstrated resistance of membrane function to cold in several tissues of hibernating mammals. Thus, in hamsters or ground squirrels excitability of nerves (Chatfield et al., 1948; Kehl and Morrison, 1960) and cardiac muscle (see Marshall and Willis, 1962) is maintained at low temperatures, the resting membrane potential of atrial fibers is virtually unchanged by temperatur...

After being affected by naturally low temperature (-4~0°C), the changes of relative electrical conductivity and MDA content of 11 fennel varieties were tested. The experiment studied the relationship between the cold resistance and changes of relative electrical conductivity and MDA content of varieties. The results showed that the relative electrical conductivity and MDA content were higher th...

The purposes of the present study were to compare the cardiovascular response patterns evoked by three versions of the cold pressor test (either forehead stimulation or hand or foot immersion) and to determine the reproducibility of the responses over a 2-week interval. Blood pressure, heart rate, stroke volume, cardiac output, total peripheral resistance, and systolic time intervals were obtai...

Possible links between seasonal increases in cold-tolerance and desiccation resistance were examined in field-collected larvae of the goldenrod gall fly, Eurosta solidaginis. From 20 September to 30 October 2001, larvae exhibited a gradual increase in cold-tolerance culminating in 100% survival of freezing at -20 degrees C for 24 h. The increase in cold-tolerance was probably due to a concomita...