Developments and trends in fruit bar production and characterization.

Fruits serve as a source of energy, vitamins, minerals, and dietary fiber. One of the barriers in increasing fruit and vegetables consumption is time required to prepare them. Overall, fruit bars have a far greater nutritional value than the fresh fruits because all nutrients are concentrated and, therefore, would be a convenience food assortment to benefit from the health benefits of fruits. The consumers prefer fruit bars that are more tasted followed by proper textural features that could be obtained by establishing the equilibrium of ingredients, the proper choosing of manufacturing stages and the control of the product final moisture content. Fruit bar preparations may include a mixture of pulps, fresh or dried fruit, sugar, binders, and a variety of minor ingredients. Additionally to the conventional steps of manufacturing (pulping, homogenizing, heating, concentrating, and drying) there have been proposed the use of gelled fruit matrices, dried gels or sponges, and extruders as new trends for processing fruit bars. Different single-type dehydration or combined methods include, in order of increasing process time, air-infrared, vacuum and vacuum-microwave drying convective-solar drying, convective drying, and freeze drying are also suggested as alternative to solar traditional drying stage. The dehydration methods that use vacuum exhibited not only higher retention of antioxidants but also better color, texture, and rehydration capacity. Antioxidant activity resulting from the presence of phenolic compounds in the bars is well established. Besides this, fruit bars are also important sources of carbohydrates and minerals. Given the wide range of bioactive factors in fresh fruits that are preserved in fruit bars, it is plausible that their uptake consumption have a positive effect in reducing the risk of many diseases.

Self-management interventions for chronically ill patients with limited health literacy: A descriptive analysis.

OBJECTIVES: To support patients with limited health literacy with the challenges they face in the day-to-day management of their disease(s), numerous self-management interventions (SMIs) have been developed. To date, it is unclear to what extent SMIs have been developed for chronically ill patients with limited health literacy. This study aims to provide a description of these SMIs and to provide insight in their methodological components. METHODS: A secondary analysis of the COMPAR-EU database, consisting of SMIs addressing patients with diabetes, chronic obstructive pulmonary disease, obesity and heart failure, was conducted. The database was searched for SMIs addressing health literacy, including cognitive aspects and the capacity to act. RESULTS: Of the 1681 SMIs in the COMPAR-EU database, 35 studies addressed health literacy, describing 39 SMIs. The overview yields a high variety in interventions given, with overlapping information, but also lacking of specific details. DISCUSSION: This descriptive analysis shows that there was a large variety in the extensiveness of the description of intervention characteristics and their justification or explanation. A focus on the broad concept of health literacy, including functional skills, cognitive skills and the capacity to act could improve the effectiveness. This should be taken into account in the future development of SMIs.

Incidence and predictors of major perioperative adverse cardiac and cerebrovascular events in non-cardiac surgery.

BACKGROUND: Major adverse cardiac and cerebrovascular events (MACCE) represent the most common cause of serious perioperative morbidity and mortality. Our aim was to identify risk factors for MACCE in a broad surgical population with intermediate-to-high surgery-specific risk and to build and validate a model to predict the risk of MACCE. METHODS: A prospective, multicentre study of patients undergoing surgical procedures under general or regional anaesthesia in 23 hospitals. The main outcome was the occurrence of at least one perioperative MACCE, defined as any of the following complications from admittance to discharge: cardiac death, cerebrovascular death, non-fatal cardiac arrest, acute myocardial infarction, congestive heart failure, new cardiac arrhythmia, angina, or stroke. The MACCE predictive index was based on ß-coefficients and validated in an external data set. RESULTS: Of 3387 patients recruited, 146 (4.3%) developed at least one MACCE. The regression model identified seven independent risk factors for MACCE: history of coronary artery disease, history of chronic congestive heart failure, chronic kidney disease, history of cerebrovascular disease, preoperative abnormal ECG, intraoperative hypotension, and blood transfusion. The area under the receiver-operating characteristic curve was 75.9% (95% confidence interval, 71.2-80.6%). CONCLUSIONS: The risk score based on seven objective and easily assessed factors can accurately predict MACCE occurrence after non-cardiac surgery in a population at intermediate-to-high surgery-specific risk.

Genetic variation and phylogeography of central Asian and other house mice, including a major new mitochondrial lineage in Yemen.

The mitochondrial DNA (mtDNA) control region and flanking tRNAs were sequenced from 76 mice collected at 60 localities extending from Egypt through Turkey, Yemen, Iran, Afghanistan, Pakistan, and Nepal to eastern Asia. Segments of the Y chromosome and of a processed p53 pseudogene (Psip53) were amplified from many of these mice and from others collected elsewhere in Eurasia and North Africa. The 251 mtDNA types, including 54 new ones reported here, now identified from commensal house mice (Mus musculus group) by sequencing this segment can be organized into four major lineages-domesticus, musculus, castaneus, and a new lineage found in Yemen. Evolutionary tree analysis suggested the domesticus mtDNAs as the sister group to the other three commensal mtDNA lineages and the Yemeni mtDNAs as the next oldest lineage. Using this tree and the phylogeographic approach, we derived a new model for the origin and radiation of commensal house mice whose main features are an origin in west-central Asia (within the present-day range of M. domesticus) and the sequential spreading of mice first to the southern Arabian Peninsula, thence eastward and northward into south-central Asia, and later from south-central Asia to north-central Asia (and thence into most of northern Eurasia) and to southeastern Asia. Y chromosomes with and without an 18-bp deletion in the Zfy-2 gene were detected among mice from Iran and Afghanistan, while only undeleted Ys were found in Turkey, Yemen, Pakistan, and Nepal. Polymorphism for the presence of a Psip53 was observed in Georgia, Iran, Turkmenistan, Afghanistan, and Pakistan. Sequencing of a 128-bp Psip53 segment from 79 commensal mice revealed 12 variable sites and implicated >/=14 alleles. The allele that appeared to be phylogenetically ancestral was widespread, and the greatest diversity was observed in Turkey, Afghanistan, Pakistan, and Nepal. Two mice provided evidence for a second Psip53 locus in some commensal populations.

Optimization of a duplex amplification and sequencing strategy for the HVI/HVII regions of human mitochondrial DNA for forensic casework.

A duplex primer set for the amplification of mitochondrial DNA HVI and HVII control regions was evaluated for the optimization of a DNA sequencing protocol suitable for forensic casework. HVI and HVII products, with the absence of non-specific products, could be detected by agarose gel electrophoresis when as little as 0.5 and 0.1pg of DNA were amplified for 34 and 38 cycles, respectively. Because HVI and HVII amplicons are co-synthesized in the duplex PCR, fewer steps are required (lessening the risk of cross contamination events) and more frugal use of precious extracted DNA samples is possible, both desirable features for forensic casework. The ABI Prism BigDyetrade mark version 1.1 chemistry provided high quality sequencing data, with little or no background noise and uniform peak heights, outcomes that favored reliable detection of heteroplasmy, particularly at early sequence reads (<40 bases). Optimal compromise between sensitivity and sequence accuracy in the absence of noise was achieved starting at 150 mitochondrial genome copies. The protocol is effective (no sequence errors) with highly degraded DNA (average detectable template size of 200bp). Dual artificial template mixtures with the minor component at 15% suggests that heteroplasmy should be detected at this level with confidence.

Diagnosis of Leishmania using the polymerase chain reaction: a simplified procedure for field work.

Oligonucleotide primers directed to the minicircle kinetoplast DNA of Leishmania strains supported enzymatic amplification of this DNA by the polymerase chain reaction (PCR). A single product of 70 basepairs was obtained from parasites belonging exclusively to the L. braziliensis complex. Direct sequencing of the amplified product confirmed its minicircle origin. Skin biopsy specimens from human patients were used directly for the PCR. A pulse incubation of such specimens with deoxyribonuclease I prior to the PCR increased the reliability of the assay. Nuclease disruption of the kinetoplast network was expected to make more copies of the minicircle accessible to amplification. Comparative results between the PCR and conventional parasitologic detection procedures indicate that the DNA detection approach presented is by far more sensitive for diagnostic purposes. Innovations in the PCR protocol are presented that adapt the diagnosis of leishmaniasis to settings with minimal equipment and that are distant from central laboratories.

Mutations in topA interfere with the inducible expression of DNA damage response loci in Salmonella typhimurium.

Strains of Salmonella typhimurium deficient in topoisomerase I activity (topA mutants) are UV sensitive and non-mutable (Overbye and Margolin: J Bacteriol 146:170-178, 1981). Using lac-operon fusions to DNA damage inducible (din) loci we investigated whether these observations could be explained by an inability of topA strains to efficiently induce DNA damage responses. Mitomycin C (MMC)-induced expression of lac-operon fusions to uvrB and to a second SOS locus, din-9, was largely eliminated in topA bacteria. The inducible expression of several other din-fusions was also diminished. This inducibility defect was mimicked by growth of din-9 topA+ bacteria in media of high osmolarity, a condition that leads to increased DNA supercoiling. Inhibitors of DNA gyrase efficiently induced din-9 in topA bacteria. Together, these results suggest that the topA effect on din expression may be mediated at the level of DNA supercoiling. The sensitivities of a number of din-fusions to topA paralleled the degree to which they were repressed by excess LexA, suggesting that mutations in topA might influence LexA-operator interactions and/or increase lexA expression.

A screening procedure for the efficient recognition of Escherichia coli K-12 mutants.

A method is described for the rapid screening of large numbers of E. coli colonies for detection of auxotrophs and mutants defective in sugar or succinate metabolism. The procedure permits recognition of forward mutations in a large number of functions and is applicable to the isolation of temperature-sensitive mutants in essential and nonessential genes.

On mutation fixation resulting from nitrosoguanidine-induced DNA damage in Escherichia coli K12 ada-.

Brief treatment with nitrosoguanidine of E. coli defective in the removal of the pre-mutagenic lesion, gives rise to cells that segregate mutant clones. No depletion in the number of such cells occurs for at least 4 generations of growth in liquid medium. It is concluded that pre-mutagenic lesions persist and result in copying errors by an otherwise normal replication machinery.

Monitoring Piscirickettsia salmonis by denaturant gel electrophoresis and competitive PCR.

Reported strains of Piscirickettsia salmonis, a pathogen of salmonid fishes, were analyzed by amplifying part of the internal transcribed spacer (ITS) of the ribosomal RNA (rRNA) operon followed by denaturing gradient gel electrophoresis (DGGE) of the amplicons. All amplified fragments differing in sequence were distinguished by migration during DGGE. A simpler format, constant denaturant gel electrophoresis (CDGE), allowed the same diagnostic distinctions among strains. Sampling during 1997 and 1998 of salmonids from 5 different sites on and near Chiloé Island in southern Chile displaying piscirickettsiosis revealed only P. salmonis resembling LF-89, the type strain first isolated in 1989. These observations are encouraging for control strategies, which might otherwise be compromised by unpredictable shifts of P. salmonis types in salmon farms. A competitive PCR assay offered insight about the power of PCR for quantification and about specific tissue invasiveness by this intracellular pathogen. This approach revealed that the PCR could amplify approximately 1 to 10 P. salmonis genome equivalents against a background of > 99.9% salmonid DNA. It also raised the possibility that the salmonid brain is an important site for P. salmonis survival, with its bacterial load in 1 individual having been about 100 times the loads observed in liver and kidney. Pathogen detection by competitive PCR in a surface seawater sample from a netpen in use indicated a density of about 3000 to 4000 P. salmonis cells (or their DNA remnants) 1(-1). Such quantitative estimates should aid decisions about disease prevention and management as, for example, choice of netpen sites following fallow periods and certification of ova, which are known conduits of infection.

Insecticide susceptibility in Anopheles pseudopunctipennis from Colombia: comparison between bioassays and biochemical assays.

Anopheles pseudopunctipennis, one of the primary vectors of malaria in the southwest of Colombia, was evaluated for susceptibility to the 3 major insecticide groups (organophosphates, pyrethroids, and carbamates) by bioassay and biochemical assay. Larval populations, which were collected principally from irrigation channels in agricultural areas, where the intensity of insecticide use varied, were utilized to establish susceptibility for the 1st time in this species. The baselines for each population showed a range of biological susceptibility to the insecticides evaluated, but overall no resistance was detected according to standards established by the World Health Organization. The high sensitivity of biochemical microassays enabled the detection of a small proportion of mosquitoes with higher levels of nonspecific esterases and mixed-function oxidases from 2 areas where agricultural application of organophosphate and pyrethroid insecticides had been heavy. These differences were not sufficient to affect susceptibility as measured by bioassay. No evidence of insensitive acetylcholinesterase was observed. Absence of resistance in areas that have experienced heavy insecticide application could be explained by genetic drift, by gene flow from areas without insecticide pressure, by manner of exposure to the insecticides, or by recent changes in agricultural activities that decreased insecticide use. Baseline values were established that serve as provisional susceptibility thresholds for applying simple Centers for Disease Control and Prevention biochemical assay and bioassay methods to larvae of this anopheline species.

[Evaluation of the efficiency of pharmacological antiemetic prophylaxis in different risk groups after general anaesthesia in the surgical population of Catalonia]. / Valoración de la eficiencia de la profilaxis antiemética farmacológica en diferentes grupos de riesgo tras anestesia general en la población quirúrgica de Cataluña.

OBJECTIVE: To assess the efficiency of pharmacological antiemetic prophylaxis in patients subjected to surgery under general anaesthetic in different postoperative nausea and vomiting (NVPO) risk groups. MATERIAL AND METHODS: A randomised, observational, prospective and multicentre cohort study was conducted. The study included 1239 patients from 26 hospitals who were subjected to elective surgery under general anaesthesia. The data collected included, demographic characteristics, the NVPO risk factors, anaesthetic technique, type of surgery, the duration, fluid therapy, antiemetic prophylaxis administered, and the incidence of NVPO in the first 24h after surgery. A stratified analysis (low, moderate and high risk) was performed with the intention of evaluating the relationship between prophylaxis and NVPO using a logistic regression model adjusted for propensity score. The number of patients needed to treat (NNT) to prevent an NVPO episode was then calculated for each of the strata. RESULTS: The incidence of NVPO in the low risk stratum was 21.6% without prophylaxis and 8.6% with prophylaxis, 31.3% compared to 17.7% in the moderate risk, and 46.5% compared to 32.7% in the high risk group. There was a significant protective effect in the three strata (odds ratio between treated and untreated patients) and in the NNT (95% CI) was 7 (5-11) in the low risk stratum, 7 (5-13) in that of the moderate risk, and 6 (4-16) in the high risk. CONCLUSIONS: The efficiency of pharmacological antiemetic prophylaxis in patients subjected to surgery under general anaesthesia was similar in all risk groups. Not providing antiemetic prophylaxis in low risk patients may not be justified due to the cost-effectiveness criteria. Future clinical guidelines to improve the quality of health care of patients operated on under general anaesthesia should consider the advantages of a universal NVPO prophylaxis.

An inducible pathway is required for mutagenesis in Salmonella typhimurium LT2.

UV mutability of Salmonella typhimurium LT2 was eliminated in the presence of a multicopy plasmid carrying the Escherichia coli lexA+ gene. This result suggests that inducible, SOS-like functions are required for UV mutagenesis in S. typhimurium. S. typhimurium strains carrying either point or deletion mutations in topA had previously been shown to lose their mutability by UV or methyl methanesulfonate (K. Overbye and P. Margolin, J. Bacteriol. 146:170-178, 1981; K. Overbye, S. M. Basu, and P. Margolin, Cold Spring Harbor Symp. Quant. Biol. 47:785-791, 1983). Mitomycin C induction of the phi(mucB'-lacZ') fusion (a DNA damage-inducible locus carried on plasmid pSE205) in S. typhimurium topA was normal, suggesting that RecA is activated in topA mutants. These observations lead us to deduce that S. typhimurium has at least one DNA damage-inducible locus in addition to recA that is required for UV mutability.

DNA stabilization and amplification from museum collections of extracts originally intended for allozyme analysis.

Protein extracts originally prepared for isozyme electrophoresis two decades ago contain surviving DNA sequences susceptible to amplification by the polymerase chain reaction (PCR). Amplification was also possible after stabilization of such extracts on filter paper and immersion under mineral oil without refrigeration.

DNA damage-inducible loci in Salmonella typhimurium.

lac operon fusions to DNA damage-inducible (din) loci were generated in Salmonella typhimurium LT2. Many of these din fusions were efficiently repressed by cloned Escherichia coli LexA, while others were not; all required RecA for induction. Several din fusions exhibited strong inducibility and will be useful in developing an SOS induction assay in S. typhimurium to detect genotoxins.

Phylogenetic compositions of bacterioplankton from two California estuaries compared by denaturing gradient gel electrophoresis of 16S rDNA fragments.

The phylogenetic compositions of bacterioplankton assemblages from San Francisco Bay and Tomales Bay, Calif., differed substantially when analyzed by PCR-denaturing gradient gel electrophoresis; these differences are consistent with the results of previous studies demonstrating differences in their metabolic capabilities. PCR-denaturing gradient gel electrophoresis analysis of complex microbial assemblages was sensitive and reliable, and the results were reproducible as shown by experiments with constructed and naturally occurring assemblages.

Specific inhibition of outgrowth of Bacillus subtilis spores by novobiocin.

Spores of a Bacillus subtilis mutant temperature sensitive in deoxyribonucleic acid (DNA) replication proceeded through outgrowth at the nonpermissive temperature to the same extent as the wild-type parent spores. In contrast, the DNA synthesis inhibitor novobiocin completely prevented spore outgrowth while displaying a marginal effect on logarithmic growth during one generation time. Inhibition of outgrowth by novobiocin occurred in the absence of DNA replication, as demonstrated in an experiment with spores of the temperature-sensitive DNA synthesis mutant at the restrictive temperature. Novobiocin inhibited the initial rate of ribonucleic acid synthesis to the same extent in germinated spores and in exponentially growing cells. A novobiocin-resistant mutant underwent normal outgrowth in the presence of novobiocin. Therefore, novobiocin inhibition was independent of its effect on chromosome replication per se.

Bacillus subtilis 168 genetic transformation mediated by outgrowing spores: necessity for cell contact.

Transforming activity released in sequential genetic order during the first synchronous cycle of DNA replication during outgrowth of spores of Bacillus subtilis 168 was investigated. A transformation assay was used consisting of outgrowing spores as DNA donors and multiply marked competent cells as recipients. DNA synthesis inhibitors known to stop DNA release were used during and subsequent to DNA transfer to recipient cells. The released DNA sedimented with the outgrowing cells after low-speed centrifugation, and it was discovered that markers released both early and late were resistant to up to 500 microgram of deoxyribonuclease per ml under conditions in which the transforming capacity of purified DNA was eliminated by 5 microgram of the nuclease per ml. Inaccessibility to deoxyribonuclease was increased and maintained during the transformation event while detergents and proteolytic attack did not expose the released chromosome to nuclease action. The results indicate that tight physical contact between outgrowing spores and competent cells is required for transformation in this system.

Minimally invasive detection of Piscirickettsia salmonis in cultivated salmonids via the PCR.

The attributes of the PCR allowed implementation of an assay for specific detection of Piscirickettsia salmonis from a few microliters of fish serum. This opens the way to less invasive modes of sampling for this microbial pathogen in salmonids.