scholarly journals A Specific Diffusible Antigen of Rinderpest Virus demonstrated by the Agar Double-Diffusion Precipitation Reaction

Nature ◽  
1958 ◽  
Vol 181 (4620) ◽  
pp. 1409-1409 ◽  
Author(s):  
G. WHITE
Author(s):  
Adham Khayrullayevich Bazarov ◽  
◽  
Ozodbek Olimjon Ogli Sobirov ◽  

The microbial factor is essential in the etiology of mastitis. In this regard, bacteriological diagnostics is one of the decisive moments in the recognition and differentiation of pathological conditions of the mammary gland. However, it takes a lot of time to make a diagnosis using general methods, special culture media and reagents.


1958 ◽  
Vol 4 (6) ◽  
pp. 565-570 ◽  
Author(s):  
Edith Mankiewicz

The place of two serological techniques, the agar diffusion precipitation reaction and the complement fixation test in the classification of chromogenic acid-fast bacilli, is described. Both techniques reveal evidence of overlapping of antigens as between mycobacteria belonging to pathogenic and to saprophytic strains.


2016 ◽  
Vol 18 (3(70)) ◽  
pp. 8-13 ◽  
Author(s):  
A. Antonuk ◽  
O. Dyshkant ◽  
O. Nikitin

Getting a culture herpesviridae antigens first and second types is possible using cell cultures inoculated epithelial pig testicles and tracheal calf respectively. The incubation herpesviridae first and second types should be conducted on the above lines in cell culture incubator at a temperature of 37,5 °C for up to 10 days. To maximize the release of virus from cell culture fluid viral after incubation need three frozen at temperatures from –18 °C to + 20 °C. The resulting liquid is purified viral the culture by centrifugation. Determining the infectious activity of the culture liquid viral performed in response hemagglutination of horse erythrocytes suspension, and the material is titrated to 1: 128 in the two recurrence. Accounting reaction was performed at 2, 4, 6 and 8 hours. Infectious material volumetric activity was 1:4. Getting antigens envisages concentrating liquid viral culture fluid by reverse dialysis. To do this, conducted a study to identify the optimal concentration of antigen suitable for setting reaction diffusion precipitation. At 1:10 antigen concentration result of different reactions, depending on the account of the diffusion precipitation reactions. When concentration of EHV–1 antigen was found that the optimum dilution for its RDP is 1:20. In assessing the EHV–2 antigen, found that suitable for setting reaction diffusion precipitation RDP is an antigen concentrated from 1:60 to 1:20. In practical terms, most rational use of antigen, concentrated 20 times.Keeping culture antigens can be conducted frozen at minus 18 ° C, for 12 months because after six months of storage of the frozen infectious activity was not decreased. And in research in 12 months noted a line of precipitation in native samples and serum diluted 1:2. Working antigens for diffuse precipitation reaction must be sterile on various forms of bacteria and fungi. Therefore, samples of viral antigens were plated on agar culture media for general purpose (plain agar), after having spent preserving antigen using 0.01% solution mertiolyatu rate of 0.1 sm3/1sm3 culture fluid. Using such an environment can detect material in the test organisms belonging to different morphological groups. Research sterility subjected to viral antigens, herpesviridae infection on the first type of herpesviridae infection and the second type. 


2012 ◽  
Vol 512-515 ◽  
pp. 1740-1745
Author(s):  
Zhen Zhao Guo ◽  
Hong Li ◽  
Wei Cheng Guan ◽  
Bo Xue ◽  
Chang Ren Zhou

For successful reconstruction of skeletal defects, a range of materials including ceramics, polymers and their composites have been developed. The goal of our work is to prepare mineralized PCL/gelatin composite scaffolds in a double diffusion system as implants for bone tissue engineering application. Fibrous PCL/gelatin scaffold fabricated via electrospinning followed by immersing into disodium-β-glycerophosphate(β-GP) (10 mg/ml) for 12h were used as substrates for calcium phosphate (CaP) mineralization. The precipitation reaction was biomimetically carried out in a double diffusion system for a week. The CaP minerals precipitated on the scaffold were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and high-resolution transmission electron microscopy. The results show that apatite aggregates are combination of HAP, DCPD and ACP. β-GP can effectively promote the formation of CaP crystals. The composite scaffold fabricated in this paper hold promise for use in bone tissue engineering.


2009 ◽  
Vol 58 (4) ◽  
pp. 517-520 ◽  
Author(s):  
Aito Lahti ◽  
Jussi Saukkonen ◽  
Tapani Vainio ◽  
Yrjö Allas

Author(s):  
R.W. Carpenter

Interest in precipitation processes in silicon appears to be centered on transition metals (for intrinsic and extrinsic gettering), and oxygen and carbon in thermally aged materials, and on oxygen, carbon, and nitrogen in ion implanted materials to form buried dielectric layers. A steadily increasing number of applications of microanalysis to these problems are appearing. but still far less than the number of imaging/diffraction investigations. Microanalysis applications appear to be paced by instrumentation development. The precipitation reaction products are small and the presence of carbon is often an important consideration. Small high current probes are important and cryogenic specimen holders are required for consistent suppression of contamination buildup on specimen areas of interest. Focussed probes useful for microanalysis should be in the range of 0.1 to 1nA, and estimates of spatial resolution to be expected for thin foil specimens can be made from the curves shown in Fig. 1.


Author(s):  
John A. Sutliff

Near-eutectic Pb-Sn alloys are important solders used by the electronics industry. In these solders, the eutectic mixture, which solidifies last, is the important microstructural consituent. The orientation relation (OR) between the eutectic phases has previously been determined for directionally solidified (DS) eutectic alloys using x-ray diffraction or electron chanelling techniques. In the present investigation the microstructure of a conventionally cast, hyper-eutectic Pb-Sn alloy was examined by transmission electron microscopy (TEM) and the OR between the eutectic phases was determined by electron diffraction. Precipitates of Sn in Pb were also observed and the OR determined. The same OR was found in both the eutectic and precipitation reacted materials. While the precipitation of Sn in Pb was previously shown to occur by a discontinuous precipitation reaction,3 the present work confirms a recent finding that volume diffusion controlled precipitation can also occur.Samples that are representative of the solder's cast microstructure are difficult to prepare for TEM because the alloy is multiphase and the phases are soft.


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