Exploring the capture and desorption of CO on graphene oxide foams supported by computational calculations.

In the last decade, the highest levels of greenhouse gases (GHG) in the atmosphere have been recorded, with carbon dioxide (CO) being one of the GHGs that most concerns mankind due to the rate at which it is generated on the planet. Given its long time of permanence in the atmosphere (between 100 to 150 years); this has deployed research in the scientific field focused on the absorption and desorption of CO in the atmosphere. This work presents the study of CO adsorption employing materials based on graphene oxide (GO), such as GO foams with different oxidation percentages (3.

Skin-like low-noise elastomeric organic photodiodes.

Stretchable optoelectronics made of elastomeric semiconductors could enable the integration of intelligent systems with soft materials, such as those of the biological world. Organic semiconductors and photodiodes have been engineered to be elastomeric; however, for photodetector applications, it remains a challenge to identify an elastomeric bulk heterojunction (e-BHJ) photoactive layer that combines a low Young’s modulus and a high strain at break that yields organic photodiodes with low electronic noise values and high photodetector performance. Here, a blend of an elastomer, a donor-like polymer, and an acceptor-like molecule yields a skin-like e-BHJ with a Young’s modulus of a few megapascals, comparable to values of human tissues, and a high strain at break of 189%.

Increasing Volume in Conjugated Polymers to Facilitate Electrical Doping with Phosphomolybdic Acid.

Molecular p-type electrical dopants have been proven useful to fine-tune the optoelectronic properties of bulk organic semiconductors and their interfaces. Here, the volume in polymer films and its role in solution-based electrical p-type doping using phosphomolybdic acid (PMA) are studied. The polymer film volume was controlled using two approaches.

Large-area low-noise flexible organic photodiodes for detecting faint visible light.

Silicon photodiodes are the foundation of light-detection technology; yet their rigid structure and limited area scaling at low cost hamper their use in several emerging applications. A detailed methodology for the characterization of organic photodiodes based on polymeric bulk heterojunctions reveals the influence that charge-collecting electrodes have on the electronic noise at low frequency. The performance of optimized organic photodiodes is found to rival that of low-noise silicon photodiodes in all metrics within the visible spectral range, except response time, which is still video-rate compatible.

Solution-based electrical doping of semiconducting polymer films over a limited depth.

Solution-based electrical doping protocols may allow more versatility in the design of organic electronic devices; yet, controlling the diffusion of dopants in organic semiconductors and their stability has proven challenging. Here we present a solution-based approach for electrical p-doping of films of donor conjugated organic semiconductors and their blends with acceptors over a limited depth with a decay constant of 10-20 nm by post-process immersion into a polyoxometalate solution (phosphomolybdic acid, PMA) in nitromethane. PMA-doped films show increased electrical conductivity and work function, reduced solubility in the processing solvent, and improved photo-oxidative stability in air.

A Study on Reducing Contact Resistance in Solution-Processed Organic Field-Effect Transistors.

We report on the reduction of contact resistance in solution-processed TIPS-pentacene (6,13-bis(triisopropylsilylethynyl)pentacene) and PTAA (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]) top-gate bottom-contact organic field-effect transistors (OFETs) by using different contact-modification strategies. The study compares the contact resistance values in devices that comprise Au source/drain electrodes either treated with 2,3,4,5,6-pentafluorothiophenol (PFBT), or modified with an evaporated thin layer of the metal-organic molecular dopant molybdenum tris-[1,2-bis(trifluoromethyl)ethane-1,2-dithiolene] (Mo(tfd)3), or modified with a thin layer of the oxide MoO3. An improved performance is observed in devices modified with Mo(tfd)3 or MoO3 as compared to devices in which Au electrodes are modified with PFBT.

Comparative study of polyvinylidene fluoride and polypropylene suburethral slings in the treatment of female stress urinary incontinence.

Aims Evaluate the effectiveness and safety of polyvinylidene fluoride (PVDF) transobturator suburethral slings/tapes (TOTs) in the treatment of stress urinary incontinence, and compare them to polypropylene (PP) slings. Material and Methods A retrospective cohort study was performed on women treated with a TOT procedure at Vall d'Hebron Hospital between February 2010 and May 2013. A PVDF sling was used in surgeries on 23 women.

[Cholelithiasis in children: a clinical and morphological study].

Background: The use of ultrasonography increased the frequency of diagnosis of cholelithiasis in childhood.

Aim: To determine the clinical and laboratory features and follow up of children with biliary stones.

Patients And Methods: Twenty six children (13 male, aged 1 month to 14 years) were prospectively enrolled.

Nature and extent of gastric lesions in symptomatic Chilean children with Helicobacter pylori-associated gastritis.

Unlabelled: Chile has one of the highest rates of gastric cancer in the world and most children and adolescents in the country are colonized by Helicobacter pylori. This study assessed the nature and extent of the gastric lesions in 73 consecutive patients aged 5-17 y, referred for upper gastrointestinal endoscopy. Their H.

Proinflammatory cytokine expression in gastric tissue from children with Helicobacter pylori-associated gastritis.

Background: Helicobacter pyloriinfection of the gastric mucosa in humans is usually acquired early in life. The chronic inflammation that ensues involves the increased production of inflammatory cytokines. Published data on production of these mediators by gastric mucosa of H.

[Autoimmune hepatitis in a girl with presence of anti-LKM1 antibodies].

Autoimmune hepatitis is an inflammatory liver disease characterized by dense mononuclear cell infiltrate in the portal tract, and serologically by the presence of non-organ and liver-specific autoantibodies and increased levels of gammaglobulins in the absence of a known etiology. Three subgroups of autoimmune hepatitis have been recognized, depending on the nature of the autoantibody present in the serum: Type 1 autoimmune hepatitis, associated with smooth-muscle (SMA) or antinuclear antibody (ANA) seropositivity; type 2, with anti-liver/kidney microsome antibody (anti-LKM1), and type 3, with the absence of ANA, SMA and anti-LKM1 and presence of other autoantibodies such as anti-soluble liver antigen (SLA). Subtypes of chronic autoimmune hepatitis have clinically different features and prognoses.

[Bone mass in celiac patients].

Bone mineral content was measured in the whole body, the spine (L2-L4) and hip by Dual Photonic Absorpciometry (densitometer Norland 2600 Gd-153), in seventeen celiac patients, aged 6 to 12 years, with good adherence to the gluten free diet. The diagnosed was made before 30 months of age in 50% of cases. Average treatment duration was 69.

[Factitious gastrointestinal hemorrhage in 3 school-age girls].

Three female patients aged 9, 13 and 14 years, respectively, seen by the authors over a 1-year period presented with the complaint of recurrent hematemesis (2 patients) or melena (1 patient). The (presumed) bleeding episodes had only been seen by the respective patient and one parent (the mother in two cases and the father in one). In two cases, the other parent was antagonistic with the reported situation.

[Extrahepatic portal hypertension. Azygos-portal disconnection].

The partial or complete obstruction of portal vein and or one of its branches is the most frequent cause of portal hypertension in children. A patient with extrahepatic portal hypertension and progressive course is presented, with great development of esophagogastric varices and multiple episodes of upper gastrointestinal hemorrhage. At the age of 9 years he was submitted to an azygos-portal disconnection by abdominal route, with manual transection of the esophagus, covered and protected by a gastric fundoplication.

[Evolutionary study of 81 children with celiac disease].

A review of 81 children with celiac disease over a period of 5 years is presented. These cases were seen at the Gastroenterological Unit of the Hospital de Nińos Roberto del Río, during years 1970 through 1972. 62% of the patients (50) were placed under control of their disease, the rest were studied and diagnosed only for other centers.

[Radiological and manometric study of gastroesophageal reflux in normal infants].

The incidence of the gastroesophageal reflux was studied in 39 healthy infants with ages between 2 and 24 months. X-ray studies of gastroesophageal passage and esophageal manometry were practiced in all cases. Only 3 infants showed radiological reflux.