Efficacy of tertiary butylhydroquinone on the storage and heat stability of liquid canola shortening

The sensory (odor and flavor) and physicochemical characteristics of tertiary butylhydroquinone (TBHQ) treated and butylated hydroxyanisole/toluene (BHA/BHT) treated liquid canola shortenings, subjected to accelerated storage (Schaal oven test at 65°C) and deep fat heating (at 185°C), were determined. Data for the Schaal oven test indicate that TBHQ was effective in retarding oxidative rancidity in liquid canola shortenings. However, addition of the commonly used mixture of BHA/BHT to canola shortenings resulted in only a slight decrease in oxidation during schaal oven storage. The results obtained from deep fat heating of canola liquid shortening show that neither TBHQ nor BHA/BHT was effective in enhancing oxidative and thermal stability of this product.     

The formation of β′-sialon from a montmorillonite-polyacrylonitrile composite by carbothermal reduction: an NMR,TGA, XRD and EM study

The products of carbothermal reduction in N₂ of a nanocomposite between dodecylammonium-exchanged montmorillonite and polyacrylonitrile (PAN) have been studied by solid-state ²⁷Al and ²⁹SiNMR spectroscopy, X-ray diffraction, transmission electron microscopy and thermogravimetry. Comparison with analogous reactions involving sodium-exchanged montmorillonite and dodecylammonium-exchanged montmorillonite (without PAN) shows that in the presence of PAN, the formation of silica, cordierite or mullite is almost completely suppressed. The only crystalline phase detected between 1000 and 1300 °C was a -sialon, having a much higher SiAl ratio (7.051) than that of the precursor clay (2.441). Reduction of the octahedral AlO₆ begins near 1200 °C, forming increasing amounts of Al(N,O)₄ tetrahedra with temperature, so that by 1600 °C, complete reduction to AlN₄ (i.e. bulk AlN) has occurred. In contrast, reduction of the tetrahedral SiO₄ is appreciable at 1100 °C, and is almost complete (SiN₄ tetrahedra only) by 1200 °C. No intermediate Si(N,0)₄ environments are found. By 1600 °C, only the SiC₄ environment (i.e. bulk SiC) remains. A mechanism is suggested, involving the formation of alternating slabs of an amorphous aluminosilicate and carbon at 1000 °C, followed by diffusion of silicon from the outer regions of the aluminosilicate band towards the centre, and sequential reduction of Si(OSi)₄ and Si(OSi)₃ (OAl) groups.     

Isolation and characterization of a monoclonal anti-quadruplex DNA antibody from autoimmune "viable motheaten" mice

A cell line that produces an autoantibody specific for DNA quadruplex structures has been isolated and cloned from a hybridoma library derived from 3-month-old nonimmunized autoimmune, immunodeficient "viable motheaten" mice. This antibody has been tested extensively in vitro and found to bind specifically to DNA quadruplex structures formed by two biologically relevant sequence motifs. Scatchard and nonlinear regression analyses using both one- and two-site models were used to derive association constants for the antibody-DNA binding reactions. In both cases, quadruplexes had higher association constants than triplex and duplex molecules. The anti-quadruplex antibody binds to the quadruplex formed by the promoter-region-derived oligonucleotide d(CGCG4GCG) (Ka = 3.3 x 10(6) M-1), and has enhanced affinity for telomere-derived quadruplexes formed by the oligonucleotides d(TG4) and d(T2G4T2G4T2G4T2G4) (Ka = 5.38 x 10(6) and 1.66 x 10(7) M-1, respectively). The antibody binds both types of quadruplexes but has preferential affinity for the parallel four-stranded structure. In vitro radioimmunofilter binding experiments demonstrated that purified anti-DNA quadruplex antibodies from anti-quadruplex antibody-producing tissue culture supernatants have at least 10-fold higher affinity for quadruplexes than for triplex and duplex DNA structures of similar base composition and length. The antibody binds intramolecular DNA triplexes formed by d(G4T3G4T3C4) and d(C4T3G4T3G4), and the duplex d(CGCGCGCGCG)2 with an affinities of 6. 76 x 10(5), 5.59 x 10(5), and 8.26 x 10(5) M-1, respectively. Competition experiments showed that melted quadruplexes are not effective competitors for antibody binding when compared to native structures, confirming that the quadruplex is bound structure-specifically. To our knowledge, this is the first immunological reagent known to specifically recognize quadruplex structures. Subsequent sequence analysis demonstrates homologies between the antibody complementarity determining regions and sequences from Myb family telomere binding proteins, which are hypothesized to control cell aging via telomeric DNA interactions. The presence of this antibody in the autoimmune repertoire suggests a possible linkage between autoimmunity, telomeric DNA binding proteins, and aging.     

Diagnosis and reduction of conducted noise emissions

A systematic method for the diagnosis and reduction of conducted noise emissions is described. The method consists of a device for determining whether the differential- or common-mode component of conducted noise is dominant along with a simplified equivalent circuit of the power supply filter for each component. The procedure consists of first using the device to determine which noise-component is dominant in a particular frequency range and then using the simplified equivalent circuits to determine whether an anticipated change in value of an element in the power supply filter will be effective     

Counseling expectations as a function of fee for service.

Two studies investigated the hypothesis that counseling on a fee-for-service basis might affect client evaluation of counseling, client motivation to change, and client willingness to seek help. In Study 1, 80 male and 80 female undergraduates completed a questionnaire, which required Ss to estimate the probability of their using university counseling-center services for varied concerns, and an expectations-about-counseling questionnaire. Ss were randomly assigned to 1 of 4 experimental conditions representing fee structures: no fee, a modest fee ($5), a modest fee but knowing others pay more for the same services, and a substantial fee ($25). Results show that fee condition did not affect willingness to seek help or counseling expectancies. Although there were some differences between sexes on expectancies, there was no interaction effect for sex and fee condition. In Study 2, 12 male and 31 female 15–54 yr old former clients of a psychology clinic were asked to compare satisfaction under no-fee and fee ($5 and $25) conditions. Again, fees did not affect Ss' evaluations of, expectations for, or willingness to seek counseling. (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Application of Raman Spectroscopy to Surface Chemical Studies

Recent developments in instrumentation have led to the renaissance of Raman spectroscopy. Initial studies have shown that the technique may be used successfully to study surface chemical problems and it now seems appropriate to review these initial studies. The intent of this review is to help new workers in the field and to indicate some of the powers and limitations of the method.     

Counselor gender, type of problem, and expectations about counseling.

100 male and 100 female college students were assigned to 1 of 4 experimental conditions—female counseling psychologist (CP)/career or vocational concern (CVC); male CP/CVC; female CP/person concern (PC); or male CP/PC—and responded to an expectations-about-counseling questionnaire that included sex of CP and type of problem. Results of a MANOVA revealed a significant main effect for S Gender; no other main effects were found. Females had significantly higher expectations for the client attitudes/behaviors of motivation, openness, and responsibility and for the CP attitudes of acceptance, confrontation, and genuineness. Females also expected more attractive and trustworthy CPs than did males, expected more immediacy in the counseling process, and had a more positive outcome expectancy. Males expected CPs to be more directive and self-disclosing than did females. The 2 groups did not differ in their expectations for CP empathy, expertness, and concreteness. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Visualizing "green oil" in live algal cells

We report here that BODIPY 505/515, a green lipophilic fluorescent dye, serves as an excellent vital stain for the oil-containing lipid bodies of live algal cells. BODIPY 505/515 vital staining can be used in combination with fluorescent activated cell sorting to detect and isolate algal cells possessing high lipid content.     

“竹纤维”说法准确性的评析

<正>引言在2006年末至2007年,网络上出现大量商户销售声称使用"竹纤维"制作的服装。他们在广告中宣称"竹纤维"非常柔软,同时比棉纤维更易染色,并具有天然抗菌性能;而且由于生长过程中没有使用农药;要远比棉花纤维等其他纤维更环保。