Neonatal Isolation Stress Inhibits Pre-Weaning Weight Gain and Mild-Stressor Induced Locomotor Activity in Early Adolescent Male and Female Rats

The present study looked at the effects of neonatal isolation, an early life stress experience, in male and female early adolescent rats, an age which is underrepresented in the early stress literature. Four stress-sensitive indices were assessed: weight gain during the pre-weaning period, open field activity, and locomotor activity in response to two mild stressors: exposure to a novel environment, and a single IP saline injection. Rats in the neonatal isolation condition were removed from dam and littermates on postnatal days 2-9 in accord with the procedure used by Kehoe et al. (1995); behavioral testing occurred on PN25-PN30 during the early adolescent period. It was found that neonatally isolated pups weighed less than non-isolate controls on each of three measurement days (PN7, PN14, PN21) throughout the pre-weaning period. Further, neonatal isolation experience consistently reduced horizontal locomotor activity measured in the open field, in a novel environment, and following a single mild acute stressor. On some measures, behavior reflected greater impact of NI in males compared with NI females, suggesting that the effects of NI in early adolescent rats may be sexually dimorphic

Àiax embogit: Anàlisi d’una follia amb múltiples visions

Treballs Finals de Grau de Filologia Clàssica (Grec). Facultat de Filologia. Universitat de Barcelona. Curs: 2023-2024. Tutor: Carles Garriga Sans[cat] Aquest treball té l’objectiu d’analitzar la follia del personatge d’Àiax a l’Àiax de Sòfocles. Primer de tot, es contextualitza el concepte de la follia en la literatura homèrica, tot explicant el seu origen i com el seu sentit ha anat variant al llarg del temps fins a la tragèdia grega del segle V a. C. Després de tenir ja una visió general de la follia a la literatura grega, que ens permetrà apropar-nos i entendre la follia d’Àiax, es fa una breu contextualització de la tragèdia en qüestió. Posteriorment, s’expliquen els nou diferents termes que Sòfocles utilitza per referir-se a la follia i la seva evolució al llarg de la tragèdia, partint de les diverses versions que en donen alguns personatges de l’obra i les imatges que el poeta presenta per referir-s’hi

Contribución al estudio de la resistencia a diversos agentes antimicrobianos en cepas salvajes de Pseudomonas aeruginosa aisladas de aguas y suelos de Cataluña

Tesi de Llicenciatura per a la obtenció del Grau de Farmàcia. Facultat de Farmàcia. Universitat de Barcelona. Director: Ma. Dolores Simón Pujol. 1977

Àiax embogit: Anàlisi d’una follia amb múltiples visions

Treballs Finals de Grau d'Estudis Literaris, Facultat de Filologia, Universitat de Barcelona. Curs: 2023-2024. Tutor: Carles Garriga Sans[cat] Aquest treball té l’objectiu d’analitzar la follia del personatge d’Àiax a l’Àiax de Sòfocles. Primer de tot, es contextualitza el concepte de la follia en la literatura homèrica, tot explicant el seu origen i com el seu sentit ha anat variant al llarg del temps fins a la tragèdia grega del segle V a. C. Després de tenir ja una visió general de la follia a la literatura grega, que ens permetrà apropar-nos i entendre la follia d’Àiax, es fa una breu contextualització de la tragèdia en qüestió. Posteriorment, s’expliquen els nou diferents termes que Sòfocles utilitza per referir-se a la follia i la seva evolució al llarg de la tragèdia, partint de les diverses versions que en donen alguns personatges de l’obra i les imatges que el poeta presenta per referir-s’hi

Aislamiento y caracterización de Pseudomonas aeruginosa procedentes de distintos habitats: aspectos ecológicos y sanitarios

[spa] Pseudomonas aeruginosa es un microoganismo Gram-negativo, potencialmente patógeno, agente causal de serias infecciones en el hombre que cursan con gran variedad de síntomas (HOMMA, 1971). Entre sus principales características destacan su elevada resistencia a los agentes antimicrobianos y su potencial metabólico, siendo capaz de utilizar un número muy elevado de compuestos (LIU, 1976; STANIER et al., 1977). La existencia en el medio ambiente de bacterias patógenas multirresistentes, como P. aeruginosa, puede significar un insospechado peligro para el hombre. Las implicaciones de la presencia y origen de estos microorganismos son cuestiones importantes que deben seírcontestadas (COLWELL y SIZEMORE, 1974). Para entender el comportamiento de un microorganismo patógeno oportunista como P, aeruginosa y poderlo combatir de forma efectiva, es necesario estudiar su ciclo y las relaciones que presenta en el medio ambiente, pudiendo llegar de esta forma a conocer sus vías de transmisión (HOADLEY, 1977, YOUNG, 1977). El fin de esta tesis es eliminar algunas barreras existentes en el campo de la Microbiología, presentando una información conjunta esencial para el entendimiento de la P. aeruginosa. En esta memoria se estudian algunos aspectos de su biología, sobre todo los que hacen referencia a su resistencia ante agentes antimicrobianos. Su incidencia y nivel de resistencia puede significar un verdadero reto para la salud pública

Multilayer emulsions stabilized by vegetable proteins

There is great interest in the food, cosmetic and pharmaceutical industry in the use of proteins and polysaccharides as natural hydrocolloids to create novel emulsion systems with improved stability and functionality. For example, the electrostatic interaction between proteins and polysaccharides may be used to form oil-in-water (O/W) emulsions with multilayered interfacial membranes around oil droplets or multilayer emulsions. This type of emulsions have been developed using the layer-by-layer (LbL) technique, which consists of direct adsorption of an oppositely charged polyelectrolyte layer (e.g. polysaccharides) on a primary layer of ionic emulsifiers (e.g. proteins). The polymeric structure and electrical charge of proteins make them a special class of compounds very suitable for its utilization in the LbL technique. In recent years, the utilization of proteins as emulsifier in the food and pharmaceutical industry has been turning towards plants as a preferred alternative to animal-based sources. This article reviews the current understanding of the utilization of different vegetable proteins as emulsifier in order to stabilize O/W multilayer emulsions systems. Additionally, it highlights some potential applications of the multilayer emulsion technology in the industry for improving the stability of emulsions to environmental stresses or and for developing controlled or triggered release systems

Über die Anwendung des Furfurols als Reagens zur Erkennung des Sesamöls in Ölmischungen

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Optimizing the production of the biosurfactant lichenysin and its application in biofilm control

Aims: Apply response surface methodology (RSM) to develop and optimize an economical medium for lichenysin production, which is a surfactant produced by Bacillus licheniformis and evaluate the application of lichenysin in the prevention and disruption of pathogenic micro-organism biofilm that creates health problems in the food industry and hospitals. Results: An economical medium containing molasses was optimized to enhance lichenysin production by RSM. A production of 3.2 g l 1 of lichenysin was achieved with an optimum medium containing 107.82 g l 1 of molasses, 6.47 g l 1 of NaNO3 and 9.7 g l 1 of K2HPO4/KH2PO4, in which molasses and phosphate salts had a significant effect on biosurfactant production. Lichenysin was effectively applied in a surface pre-treatment to avoid microbial biofilm development of methicillin-resistant Staphylococcus aureus (MRSA) (68.73%) and Candida albicans (74.35%), with ED50 values of 8.3 and 17.2 lg ml 1 respectively. It was also very efficient in a surface posttreatment to remove biofilms of MRSA (55.74%) and Yersinia enterocolitica (51.51%), with an ED50 of 2.79 and 4.09 lg ml 1 respectively. Conclusions: Lichenysin was found to have notable anti-adhesion activity, being able to prevent and eliminate the biofilm formation by pathogenic strains associated with foodborne illness. This new medium resulted in a fourfold increase in production compared with the nonoptimized medium. Significance and Impact of the Study: Molasses can be regarded as a useful resource for biotechnological applications, such as the production of lichenysin. The use of agro-industrial substrates has an important role in the sustainable and competitive development of several industrial sectors, as well as in industrial residues management. Additionally, lichenysin is particularly effective in preventing biofilm formation by strains problematic for the food industry and in the hospital environment. Lichenysin also efficiently disrupts biofilm

Unveiling the Membrane and Cell Wall Action of Antimicrobial Cyclic Lipopeptides: Modulation of the Spectrum of Activity

Antibiotic resistance is a major public health challenge, and Gram-negative multidrug-resistant bacteria are particularly dangerous. The threat of running out of active molecules is accelerated by the extensive use of antibiotics in the context of the COVID-19 pandemic, and new antibiotics are urgently needed. Colistin and polymyxin B are natural antibiotics considered as last resort drugs for multi-resistant infections, but their use is limited because of neuro- and nephrotoxicity. We previously reported a series of synthetic analogues inspired in natural polymyxins with a flexible scaffold that allows multiple modifications to improve activity and reduce toxicity. In this work, we focus on modifications in the hydrophobic domains, describing analogues that broaden or narrow the spectrum of activity including both Gram-positive and Gram-negative bacteria, with MICs in the low µM range and low hemolytic activity. Using biophysical methods, we explore the interaction of the new molecules with model membranes that mimic the bacterial inner and outer membranes, finding a selective effect on anionic membranes and a mechanism of action based on the alteration of membrane function. Transmission electron microscopy observation confirms that polymyxin analogues kill microbial cells primarily by damaging membrane integrity. Redistribution of the hydrophobicity within the polymyxin molecule seems a plausible approach for the design and development of safer and more selective antibiotics