2,868 research outputs found
Phenolic profile of Cydonia oblonga Miller leaves
Cydonia oblonga Miller leaves phenolic compounds were analyzed by reversed-phase HPLC/DAD and HPLC/UV. Qualitative and quantitative analysis of phenolics were carried out in a total of 36
samples of quince leaves from three different geographical origins of Northern (Bragança and
Carrazeda de Ansiães) and Central Portugal (Covilhã) and three collection months (June, August,
and October of 2006). These leaves presented a common phenolic profile composed by nine
compounds: 3-O-, 4-O- and 5-O-caffeoylquinic acids, 3,5-O-dicaffeoylquinic acid, quercetin-3-Ogalactoside,
quercetin-3-O-rutinoside, kaempferol-3-O-glycoside, kaempferol-3-O-glucoside, and
kaempferol-3-O-rutinoside. 5-O-caffeoylquinic acid was the major phenolic compound (36.2%),
followed by quercetin 3-O-rutinoside (21.1%). Quince leaves are characterized by higher relative
contents of kaempferol derivatives than fruits (pulps, peels, and seeds), especially in what concerns
kaempferol-3-O-rutinoside (12.5%). C. oblonga leaves total phenolic content was very high, varying
from 4.9 to 16.5 g/kg dry matter (mean value of 10.3 g/kg dry matter), indicating that these leaves
can be used as a good and cheap source of bioactive constituents. Significantly differences were
observed in 3-O-caffeoylquinic and 3,5-O-dicaffeoylquinic acids contents, according to geographical
provenance and harvesting month, suggesting a possible use of these compounds as geographical
origin and/or maturity markers
Organic acids composition of Cydonia oblonga Miller leaf
Organic acid profiles of 36 Cydonia oblonga Miller leaf samples, from three different geographical origins of northern (Bragança and Carrazeda de Ansiães) and central Portugal (Covilhã), harvested in three collection months (June, August and October of 2006), were determined by HPLC/UV (214 nm). Quince leaves presented a common organic acid profile, composed of six constituents: oxalic, citric, malic, quinic, shikimic and fumaric acids. C. oblonga leaves total organic acid content varied from 1.6 to 25.8 g/kg dry matter (mean value of 10.5 g/kg dry matter). Quinic acid was the major compound (72.2%), followed by citric acid (13.6%).
Significant differences were found in malic and quinic acids relative abundances and total organic acid contents according to collection time, which indicates a possible use of these compounds as maturity markers.
Between June and August seems to be the best period to harvest quince leaves for preparation of decoctions or infusions, since organic acids total content is higher in this season
Experimental Realization of Teleporting an Unknown Pure Quantum State via Dual Classical and Einstein-Podolski-Rosen Channels
We report on a quantum optical experimental implementation of teleportation
of unknown pure quantum states. This realizes all the nonlocal aspects of the
original scheme proposed by Bennett et al. and is equivalent to it up to a
local operation. We exhibit results for the teleportation of a linearly
polarized state and of an elliptically polarized state. We show that the
experimental results cannot be explained in terms of a classical channel alone.Comment: 11 pages LaTeX, 3 figures, 1 page figures captions. The figures and
figures captions are not encapsulated; please print them separatel
Determination of low molecular weight volatiles in Ficus carica using HS-SPME and GC/FID
Ficus carica L. is one of the earliest cultivated fruit trees, having an important consumption in Mediterranean
countries. In this work, the volatile compound profiles of two characteristic Portuguese white varieties
(‘‘Pingo de Mel” and ‘‘Branca Tradicional”) was determined by HS-SPME and GC/FID. Leaves, pulps
and peels, submitted to freezing and lyophilisation treatments, were analysed.
The two varieties presented a similar profile composed of eight volatile compounds: acetaldehyde,
ethyl acetate, methanol, ethanol, hexanal, limonene, (E)-2-hexenal and octanal. The total volatile content
was different among the vegetal materials, following the order leaves > peels > pulps. Methanol and ethanol
are the major compounds in all samples.
The developed procedure revealed to be rapid, sensitive, reproducible and accurate. The detection limit
values were low, and the method precise. The recovery values for acetaldehyde, ethyl acetate, methanol
and ethanol were generally high, suggesting that it will be most suitable for compounds with low molecular
weight. Due to its rapidity and low cost, this technique can be useful in the quality control of fig fruit
and leaves
Obesity, energy balance and spermatogenesis
Obesity has grown to pandemic proportions. It affects an increasing number of children, adolescents and young adults exposed to the silent comorbidities of this disorder for a longer period. Infertility has arisen as one important comorbidity associated with the energy dysfunction promoted by obesity. Spermatogenesis is a highly regulated process that is determined by specific energetic requirements. The reproductive potential of males relies on hormonal-dependent and -independent stimuli that control sperm quality. There are conflicting data concerning the impact of male overweight and obesity on sperm quality, as well as on the possible paternal-induced epigenetic trait inheritance of obesity. In addition, it remains a matter of debate whether massive weight loss induced by lifestyle interventions, drugs or bariatric surgery may or may not benefit obese men seeking fatherhood. Herein, we propose to discuss how energy balance may modulate hormonal signalling and sperm quality in overweight and obese men. We also discuss some molecular mechanisms that mediate obesity-related dysfunction in male reproductive system and how paternal obesity may lead to trait inheritance. Finally, we will discuss how lifestyle modifications and sustained weight loss, particularly the loss achieved by bariatric surgery, may revert some of the deleterious effects of obesity in men and their offspring.info:eu-repo/semantics/publishedVersio
Effect of the conservation procedure on the contents of phenolic compounds and organic acids in Chanterelle (Cantharellus cibarius) Mushroom
To check the influence of the conservation procedure in the chemical composition of chanterelle mushroom, phenolic compounds and organic acids of samples preserved under four different
conditions (drying, freezing, conservation in olive oil and in vinegar) were determined. Phenolics and
organic acids were analyzed by HPLC-DAD and HPLC-UV, respectively. The results showed that
chanterelle is characterized by the presence of six phenolic compounds (3-, 4-, and 5-O-caffeoylquinic
acid, caffeic acid, p-coumaric acid, and rutin) and five organic acids (citric, ascorbic, malic, shikimic,
and fumaric acids). Samples preserved in olive oil also exhibited hydroxytyrosol, tyrosol, luteolin,
and apigenin, whereas conservation in vinegar led to the detection of hydroxytyrosol, tyrosol, and
tartaric acid in the analyzed samples. The conservation procedures to which chanterelle samples
were subjected seem to affect the qualitative and quantitative phenolics and organic acids profiles
FAO/WHO GIFT (Global Individual Food consumption data Tool): a global repository for harmonised individual quantitative food consumption studies
Knowing who eats what, understanding the various eating habits of different population groups, according to the geographical area, is critical to develop evidence-based policies for nutrition and food safety. The FAO/WHO Global Individual Food consumption data Tool (FAO/WHO GIFT) is a novel open-access online platform, hosted by FAO and supported by WHO, providing access to harmonised individual quantitative food consumption (IQFC) data, especially in low- and middle-income countries (LMIC). FAO/WHO GIFT is a growing repository, which will serve as the global FAO/WHO hub to disseminate IQFC microdata. Currently five datasets from LMIC are available for dissemination, and an additional fifty datasets will be made available by 2022. To facilitate the use of these data by policy makers, ready-to-use food-based indicators are provided for an overview of key data according to population segments and food groups. FAO/WHO GIFT also provides an inventory of existing IQFC data worldwide, which currently contains detailed information on 188 surveys conducted in seventy-two countries. In order for end-users to be able to aggregate the available data, all datasets are harmonised with the European Food Safety Authority's food classification and description system FoodEx2 (modified for global use). This harmonisation is aimed at enhancing the consistency and reliability of nutrient intake and dietary exposure assessments. FAO/WHO GIFT is developed in synergy with other global initiatives aimed at increasing the quality, availability and use of IQFC data in LMIC to enable evidence-based decision-making and policy development for better nutrition and food safety
Severe Tracheobronchomalacia after Prolonged Intubation of Multitrauma Patient
Tracheobronchomalacia is a condition with significant morbidity with many etiologies including iatrogenic ones and should be considered in critically ill ventilated trauma patients. We present a case of a multitrauma patient who had difficulty weaning from the ventilator after prolonged intubation followed by tracheostomy tube placement. We describe her presentation, diagnosis, and management provide and as well a discussion of the condition
Estudo preliminar da actividade antimicrobiana das folhas de cydonia oblonga miller
O marmelo é reconhecido como uma importante fonte de compostos promotores da saúde sendo que a actividade
antimicrobiana dos extractos da sua polpa, casca e sementes foi já avaliada. Não existem porém estudos da actividade
antimicrobiana das folhas de marmeleiro. Este estudo preliminar teve como objectivo determinar a actividade dos
seus extractos metanólicos. Concluiu-se que os extractos testados não apresentam actividade em E. coli, S. aureus,
C. albicans, C. glabrata, A. niger, A. fumigatus, Mucor spp e Absídia spp pelo que novos extractos devem ser preparados
sendo posteriormente avaliados.
Quince fruit is recognized an important source of health promoting compounds being the antimicrobial activities of
the quince pulp, peel grape and seed extracts already evaluated.
No results are known for quince leaves antimicrobial activity. This preliminary work intended to determine the activity
of quince leaves methanolic extracts. These had no antimicrobial activity either against E. coli, S. aureus, C. albicans, C.
glabrata, A. niger, A. fumigatus, Mucor spp e Absídia spp and new extracts must be prepared and evaluated
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