An experimental study of the cryoentrainment pump Progress report

Cryoentrainment pump using liquid nitrogen and helium as cooling mediu

\u3ci\u3ePhilonthus furvus\u3c/i\u3e Nordmann, 1837 and its allies in Mexico and Central America (Coleoptera: Staphylinidae)

The Mexican and Central American species associated with Philonthus firvus Nordmann, 1837 are reviewed. Nine species are treated, two of them, P. oenotrus and P. melampus, both from Mexico, are described as new. Philonthus flohri Sharp, 1876 is removed from synonymy with P. furvus. All species are described and illustrated, and a key is added to aid in their identification. All available records from Mexico and Central America, and biological data for the species are provided. Lectotypes are designated for: P. flohri Sharp, 1876; P. sallaei Sharp, 1885; P. fissilis Sharp, 1885; P. nigerrimus Erichson, 1840

A study of the relative effectiveness and cost of computerized information retrieval in the interactive mode

Results of a number of experiments to illuminate the relative effectiveness and costs of computerized information retrieval in the interactive mode are reported. It was found that for equal time spent in preparing the search strategy, the batch and interactive modes gave approximately equal recall and relevance. The interactive mode however encourages the searcher to devote more time to the task and therefore usually yields improved output. Engineering costs as a result are higher in this mode. Estimates of associated hardware costs also indicate that operation in this mode is more expensive. Skilled RECON users like the rapid feedback and additional features offered by this mode if they are not constrained by considerations of cost

Enhanced moments of Eu in single crystals of the metallic helical antiferromagnet EuCo2 yAs2

The compound EuCo{2-y}As2 with the tetragonal ThCr2Si2 structure is known to contain Eu{+2} ions with spin S = 7/2 that order below a temperature TN = 47 K into an antiferromagnetic (AFM) proper helical structure with the ordered moments aligned in the tetragonal ab plane, perpendicular to the helix axis along the c axis, with no contribution from the Co atoms. Here we carry out a detailed investigation of the properties of single crystals. Enhanced ordered and effective moments of the Eu spins are found in most of our crystals. Electronic structure calculations indicate that the enhanced moments arise from polarization of the d bands, as occurs in ferromagnetic Gd metal. Electrical resistivity measurements indicate metallic behavior. The low-field in-plane magnetic susceptibilities chi{ab}(T < TN) for several crystals are reported that are fitted well by unified molecular field theory (MFT), and the Eu-Eu exchange interactions Jij are extracted from the fits. High-field magnetization M data for magnetic fields H||ab reveal what appears to be a first-order spin-flop transition followed at higher field by a second-order metamagnetic transition of unknown origin, and then by another second-order transition to the paramagnetic (PM) state. For H||c, the magnetization shows only a second-order transition from the canted AFM to the PM state, as expected. The critical fields for the AFM to PM transition are in approximate agreement with the predictions of MFT. Heat capacity Cp measurements in zero and high H are reported. Phase diagrams for H||c and H||ab versus T are constructed from the high-field M(H,T) and Cp(H,T) measurements. The magnetic part Cmag(T, H = 0) of Cp(T, H = 0) is extracted and is fitted rather well below TN by MFT, although dynamic short-range AFM order is apparent in Cmag(T) up to about 70 K, where the molar entropy attains its high-T limit of R ln8.Comment: 29 pages, 30 figures including 62 subfigures, 8 tables, 84 reference

Fourth West Australian random sample egg laying test : 1960-1961

TO help improve the quality of laying stock for poultry farmers in Western Australia the Poultry Branch of the Department of Agriculture conducts annual random sample egg laying tests. The tests reveal good and bad points in the laying strains available, and their results are a valuable guide to breeders. Most of the chickens sold in Western Australia are now bred by hatcherymen who participate in the Random Sample Tests

Fifth West Australian random sample egg laying test : 1961-1962 : progressive laying report to April 29, 1962

FIFTH RANDOM SAMPLE LAYING TEST, 1961-62 Progressive Report to April 29th, 1962 (18 Weeks

Comparison of measured and calculated thermophysical properties of nickel super-alloys

Three real grades of nickel super-alloys (IN 713LC, IN 738LC and IN 792-5A) were investigated and values of temperatures of phase transformations and latent heats of melting were obtained. All investigated quantities are very important for thermodynamic and kinetic modelling. Moreover, these data are also valuable for a lot of software used for technological processes modelling. Experimental values were obtained using Differential Thermal Analysis (DTA) measurements. Calculations were performed using Thermo-Calc 3.1 software with the use of three different databases (SSOL5, TTNI8 and TCNI6). Comparison and discussion of experimental and calculated data was performed

Presence of an anti-viral factor in peritoneal dialysis effluent

Presence of an anti-viral factor in peritoneal dialysis effluent. Viral peritonitis is an exceptionally rare occurrence in peritoneal dialysis. In fact, up to now, only one case report has been documented in the literature. In a prospective study, peritoneal dialysis effluent (PDE) was specifically cultured for the following viruses: the herpes group of viruses, including herpes simplex types I (HSV) and II, cytomegalovirus (CMV) and varicella-zoster (V-Z), and the enteroviruses group including coxsackie B-5 (Cox B), echo, enterovirus and polio. Cultures were performed under both basal conditions and in the presence of peritonitis. No viral growth was demonstrated. The possible existence of an anti-viral factor in the PDE was therefore raised. In order to investigate this hypothesis, the PDE of 16 patients undergoing intermittent peritoneal dialysis and of 24 patients on continuous ambulatory peritoneal dialysis were examined for anti-viral activity. The method used was analogous to that employed for testing the anti-viral effect of interferon (IFN). The inhibition of the cytopathic effect (CPE) of various viruses was examined in the following tissue cultures: Vero cells (a line of monkey kidney cells) incubated with HSV, vesicular stomatitis virus (VSV) and Cox B; human kidney cells incubated with parainfluenza 3 (Para-3); human foreskin fibroblasts incubated with CMV, HSV and VSV and L-929 (a line of mouse cells) incubated with VSV. As control, unused Dianeal (Travenol, Ashdod, Israel) 1.5 and 4.25 g/dl, normal saline and 5 g/dl dextrose solutions were tested under the same conditions using VSV on Vero. The PDE was also examined for the presence of specific anti-viral antibodies by microneutralization and ELISA tests. The presence of human IFN (β and γ) was evaluated by radioimmunoassay using anti IFN monoclonal antibodies. Human IFN a was tested by a bioassay using MBDK cells with VSV. PDE from both patients on intermittent peritoneal dialysis and continuous ambulatory peritoneal dialysis inhibited the cytopathic activity of all the viruses tested in the various tissue cultures, except for the mouse line of cells. No such inhibition was seen with the control solutions. Only antibodies to HSV were detected in the PDE and their titer did not correlate with the inhibition of cytopathic effect. Human IFN aα, β and γ were not detected. These studies suggest that PDE contains an anti-viral factor which is not a known IFN or an anti-viral antibody. This factor is active against both RNA and DNA viruses in both human and monkey cell cultures