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排序方式: 共有70条查询结果,搜索用时 15 毫秒
1.
The effects of spray-chilling on carcass mass loss and surface associated bacteriology 总被引:1,自引:0,他引:1
The effect of spray-chilling on carcass mass loss and bacteriology was tested in this trial. The spray-chill treatment consisted of intermittent spraying of carcasses for either 60 or 120 s every 15 min, for 10, 14 or 17 h. The 17 h/120 s spray-chill treatment gave the highest and 10 h/60 s the lowest moisture savings after 18 h of chilling. Due to insufficient drying time between the end of spraying (17 h) and the end of chilling (18 h) the carcass sides of the 17 h/60 s and 120 s treatments appeared pale and wet; this was not the case with the other treatments. Regarding microbial analyses, the results indicated that, except for the 17 h/20 s spray-chill treatment, the mean total and Enterobacteriaceae counts of the spray-chill treatments were similar to their respective control groups (conventionally chilled). The mean total and Enterobacteriaceae counts of the 17 h/20 s spray-chill treatments increased, while those of the controls decreased. 相似文献
2.
The effect of simulated cleaning in place (CIP) was determined on the structure, attachment and growth of Bacillus cereus spores isolated from raw milk and biofilms in filler nozzles from extended shelf life (ESL) milk processing lines. Simulated CIP treatment structurally affected >98% of B. cereus spores, while 0.1% remained intact. Following simulated CIP treatment, B. cereus spores were able to attach to stainless steel coupons and form biofilms. B. cereus spores were capable of germination and growth under refrigerated conditions for more than 28 days. Contamination with B. cereus spores may lead to a reduced shelf life and potentially be a safety risk in ESL milk with a prolonged shelf life. 相似文献
3.
Bacillus and Paenibacillus species associated with extended shelf life milk during processing and storage
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Characterisation of spore formers associated with extended shelf life milk was performed by analysing the bacteriological quality of milk samples collected at various processing stages and during storage. Isolates were identified with MALDI‐TOF‐MS. Milk had spore counts <2 log10 cfu/mL and 4 log10 cfu/mL during processing and storage, respectively. Bacillus pumilus dominated the bacterial population. Bacterial species were inoculated into sterile milk for a shelf life study, and the population change was observed over 42 days at 7 °C. Although the extended shelf life milk process was effective in reducing bacterial counts and species diversity, the presence of Bacillus cereus shows a potential safety problem in extended shelf life milk. 相似文献
4.
AbstractSignificant efforts have been made to address the hidden hunger challenges due to iron, zinc, iodine, and vitamin A since the beginning of the 21st century. Prioritizing the vitamin A deficiency (VAD) disorders, many countries are looking for viable alternative strategies such as biofortification. One of the leading causes of VAD is the poor bioconversion of β-carotene into retinoids. This review is focused on the opportunities of bacterial biosynthesis of retinoids, in particular, through the gut microbiota. The proposed hypothesis starts with the premise that an animal can able to store and timely convert carotenoids into retinoids in the liver and intestinal tissues. This theory is experimental with many scientific insights. The syntrophic metabolism, potential crosstalk of bile acids, lipocalins and lipopolysaccharides of gut microbiota are reported to contribute significantly to the retinoid biosynthesis. The gut bacteria respond to these kinds of factors by genetic restructuring driven mainly by events like horizontal gene transfer. A phylogenetic analysis of β-carotene 15, 15′-mono (di) oxygenase enzymes among a selected group of prokaryotes and eukaryotes was carried out to validate the hypotheses. Shedding light on the probiotic strategies through non-genetically modified organism such as gut bacteria capable of synthesizing vitamin A would address the VAD disorders. 相似文献
5.
In hot climates where quality of milk is difficult to control, a lactoperoxidase (LP) system can be applied in combination with conventional preservation treatments at sub-lethal levels to inhibit pathogenic microbes. This study investigated the effect of combined heat treatments (55 °C, 60 °C and 72 °C) and milk acidification (pH 5.0) on survival of acid-adapted and non-adapted Escherichia coli O157:H7 strains UP10 and 1062 in activated LP goat milk. Heat treatment at 72 °C eliminated E. coli O157:H7. Acid-adapted strains UP10 and 1062 cells showed resistance to combined LP and heat at 60 °C in fresh milk. The inhibition of acid-adapted and non-adapted E. coli O157:H7 in milk following combined LP-activation, heat (60 °C) and milk acidification (pH 5.0) suggests that these treatments can be applied to reduce E. coli O157:H7 cells in milk when they occur at low numbers (<5 log10 cfu mL?1) but does not eliminate E. coli O157:H7 to produce a safe product. 相似文献
6.
A van den Berg RF Kooy MM Hulsbeek D de Jong K Kok AY van der Veen CH Buys 《Canadian Metallurgical Quarterly》1996,72(2-3):225-228
Starting from five markers, with a well-defined order from distal to proximal 3p21, nine other markers could be inserted in this 3p21 map. Five were precisely mapped genetically. The other markers were ordered by FISH and/or deletion hybrid mapping. The overall 3p21 order from distal to proximal is as follows: D3S1298-D3S1260-(D3S966, D3S1448 (= D3S1449)-D3S1029-D3S32-D3S643-D3F15S2 -D3S2968-D3S1235-D3S1289-D3S1447-D3S1295. 相似文献
7.
JM Cobben M de Visser H Scheffer J Osinga G van der Steege CH Buys GJ van Ommen LP ten Kate 《Canadian Metallurgical Quarterly》1993,56(3):319-321
Fourteen cases of alveolar echinococcosis were examined by computed tomographic (CT) scanning of the liver, including 3 cases before treatment and 11 cases 2.0-7.5 years after long-term continuous albendazole therapy. In 7 cases the hepatic lesions were almost completely calcified and cured, while in 3 cases incomplete calcification of the peripheral margin of the hepatic lesions was observed. CT scanning of the one uncured case and the 3 cases before treatment showed active lesions with heterogeneous hypodense areas in the liver without calcification on the peripheral margin. Long-term continuous albendazole therapy can result in parasitological cure with death of the parasite. 相似文献
8.
Recently, a new QTN (quantitative trait nucleotide), which is located in the regulatory sequence of the imprinted IGF-II gene was discovered in the pig and is associated with a significant increase in IGF-II mRNA expression in skeletal muscle during postnatal growth. The aim of the current study was to investigate the effect of the IGF-II paternal allele (Apat and Gpat animals that inherited, respectively, the mutant and wild type paternal allele of interest) on carcass and meat quality traits in Nn and NN RYR1 genotypes. A total of 141 animals were measured, almost equally distributed over the IGF-II and RYR1 genotypes and gender. The Apat allele increased carcass lean meat percentage with approximately 4.5% (P < 0.001) as a result of decreased backfat thickness. Average live weight daily gain was not affected, hence average daily lean meat gain was significantly higher for Apat compared to Gpat animals. The IGF-II mutation had no noticeable effect on meat quality in contrast with the RYR1 mutation. No interaction effects of both mutations on meat quality were noticed. 相似文献
9.
Bhekisisa C. Dlamini John R. N. Taylor Elna M. Buys 《International Journal of Food Science & Technology》2020,55(2):841-850
Because gluten-free type brewing with unmalted sorghum does not provide adequate nitrogen for complete fermentation, wort supplementation with ammonia (as diammonium phosphate, DAP) or lysine on yeast performance was investigated. By Phenotype Microarray, under aerobic conditions, greater yeast growth was indicated with DAP than lysine both as a single source and combined with sorghum wort amino acids. With sorghum fermentation, both DAP and lysine improved maltose and maltotriose uptake. However, DAP supplementation also maintained yeast numbers (24.0–21.3 × 106 cells mL−1), whereas there was a decline with lysine supplementation. Lysine supplementation also resulted in adverse effects on yeast cell morphology. Neither DAP nor lysine supplementation resulted in evident genetic change to the yeast, but the change in substrate from barley malt wort to unmalted sorghum wort slightly altered the yeast genetically. Therefore, ammonia as DAP has potential as a nitrogen supplement for improving yeast fermentation performance in sorghum gluten-free brewing. 相似文献
10.
Development of controlled Nd:YAG laser for medical applications 总被引:1,自引:0,他引:1
S R Mordon A H Cornil B Buys J P Sozanski J M Brunetaud Y Moschetto 《Medical instrumentation》1987,21(4):222-225
Several medical fields are concerned with applications of thermal lasers such as neodymium-doped, yttrium aluminum garnet (Nd:YAG), argon, and CO2. However, quantification of the necrotic volume of Nd:YAG laser-induced damage is not possible at the time of treatment. Mathematic models and feedback control can help to optimize Nd:YAG laser treatments. We therefore formulated mathematic models for coagulation processes and developed an intelligent Nd:YAG laser system with closed-loop feedback control. Surface temperature evolution proved to be valuable data for real-time control of coagulation and ablation. Infrared thermometry provided the noncontact measurement of temperature. A computer stored the temperature data calculated by the mathematic model. Deviations of surface temperature during the treatment beyond established tolerances causes the Nd:YAG laser system to adjust the laser power automatically. 相似文献