Αρχειοθήκη ιστολογίου

Δευτέρα 21 Δεκεμβρίου 2015

Use of Raman optical tweezers for cell cycle analysis

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Analyst, 2015, Accepted Manuscript
DOI: 10.1039/C5AN00971E, Paper
Sunita Ahlawat, Aniket Chowdhury, Abha Uppal, Nitin Kumar, Pradeep Kumar Gupta
We report the results of our investigations on the use of Raman optical tweezers for label free analysis of cells in different phases of their cell cycle. The studies performed...
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Interferon gamma effect on immune mediator production in human nerve cells infected by two strains of Toxoplasma gondii

Authors: Nour Mammari, Philippe Vignoles, Mohamad Adnan Halabi, Marie-Laure Dardé and Bertrand Courtioux.<br />Parasite Vol. 22 , page 39<br />Published online: 21/12/2015<br /> Keywords: Toxoplasma gondii ; Human nerve cells ; IFN-γ ; Immunity.<img src="http://ift.tt/1IjGgkp" height="1" width="1" alt=""/>

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Protective Effects of Streblus asper Leaf Extract on H2O2-Induced ROS in SK-N-SH Cells and MPTP-Induced Parkinson’s Disease-Like Symptoms in C57BL/6 Mouse

This study investigated the effects of Streblus asper leaf extract (SA) on reactive oxygen species (ROS) in SK-N-SH cell culture and on motor functions and behaviors in MPTP-treated C57BL/6 mice. SK-N-SH cell viability after incubation with SA for 24 h was measured by MTT assay. Intracellular ROS levels of SK-N-SH cells were quantified after pretreatment with SA (0, 200, 600, and 1000 µg/mL) in the presence of H2O2 (300 µM). Male C57BL/6 mice were force-fed with water or 200 mg/kg/day SA for 32 days. Intraperitoneal injection of MPTP was used to induce Parkinson's disease-like symptoms. Catalepsy, beam balance ability, olfactory discrimination, social recognition, and spontaneous locomotor activity were assessed on days 19, 21, 23, 26, and 32, respectively. In cell culture, SA at 200, 600, and 1000 µg/mL significantly decreased ROS levels in H2O2-treated SK-N-SH cells. MPTP-treated C57BL/6 mice showed a significant change in all parameters tested when compared to the control group. Pretreatment and concurrent treatment with 200 mg/kg/day SA could antagonize the motor and cognitive function deficits induced by MPTP. The results show that SA possesses anti-Parkinson effects in MPTP-treated C57BL/6 mice and that reduction in ROS levels might be one of the mechanisms.

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Larval trematode infections in Lymnaea glabra populations living in the Brenne Regional Natural Park, central France

Authors: Daniel Rondelaud, Philippe Vignoles and Gilles Dreyfuss.<br />Parasite Vol. 22 , page 38<br />Published online: 21/12/2015<br /> Keywords: Brenne Regional Natural Park ; Cercaria ; Digenean ; Lymnaea glabra ; Lymnaeidae ; Snail.<img src="http://ift.tt/1IjGg44" height="1" width="1" alt=""/>

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Specific self-monitoring of metal-associated amyloid-[small beta] peptide disaggregation by a fluorescent chelator

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08898D, Communication
Tao Yang, Xiaohui Wang, Changli Zhang, Xiang Ma, Kun Wang, Yanqing Wang, Jian Luo, Liu Yang, Cheng Yao, Xiaoyong Wang
A dual-functional fluorescent chelator can specifically target and disassemble metal-associated A[small beta] aggregates and simultaneously self-monitor the disaggregation by fluorescence in brain homogenates of mice with Alzheimer's disease.
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From DNA to catalysis: a thymine-acetate ligated non-heme iron(III) catalyst for oxidative activation of aliphatic C-H bonds

GA?id=C5CC07597A

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC07597A, Communication
Afnan Al-hunaiti, Minna Raisanen, Timo Repo
A non-heme, iron(III)/THA(thymine-1-acetate) catalyst together with H2O2 as an oxidant is efficient in oxidative C-H activation of alkanes.
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Carbon dots with aggregation induced emission enhancement for visual permittivity detection

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08635C, Communication
Ze Xi Liu, Zhu Lian Wu, Ming Xuan Gao, Hui Liu, Cheng Zhi Huang
A simple and rapid bottom-up synthesis route to synthesize TA-CDs by using tannic acid (TA) as the carbon source was developed, which show visual permittivity dependent aggregation induced emission enhancement (AIEE) properties owing to the hampered rotations of the surface groups on CDs and reduced non-radiative decay during CD aggregation.
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Enhancing the plasmonic circular dichroism by entrapping chiral molecules at the core-shell interface of rod-shaped Au@Ag nanocrystals

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08505E, Communication
Shuai Hou, Jiao Yan, Zhijian Hu, Xiaochun Wu
When Ag is coated on the Cys-modified Au nanorods, some Cys molecules are embedded at the core-shell interface, which induce strong PCD signals.
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Construction of a polyhedron decorated MOF with a unique network through the combination of two classic secondary building units

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08941G, Communication
Guo-Jian Ren, Ze Chang, Jian Xu, Zhenpeng Hu, Yan-Qing Liu, Yue-Ling Xu, Xian-He Bu
A decorated metal-organic polyhedron based metal-organic framework with a unique 4,9-connected net is constructed, showing relatively strong interaction toward H2 and CO2 probably due to the presence of open metal sites in secondary building units.
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Bimetallic coordination polymer as a promising anode material for lithium-ion batteries

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC07151H, Communication
Chao Li, Xiaoshi Hu, Xiaobing Lou, Qun Chen, Bingwen Hu
Bimetallic coordination polymers (BiCPs) with Zn and Co were synthesized by a simple method and applied as anode materials for the first time. When used as anode materials in LIBs, the as-prepared BiCPs exhibit ultra-high capacity and impressive rate capability.
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Synthesis and electrochemical properties of Li1.3Nb0.3V0.4O2 as a positive electrode material for rechargeable lithium batteries

GA?id=C5CC08034G

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08034G, Communication
Naoaki Yabuuchi, Mitsue Takeuchi, Shinichi Komaba, Shinnosuke Ichikawa, Tetsuya Ozaki, Tokuo Inamasu
The binary system, xLi3NbO4-(1 - x)LiVO2, was first examined as an electrode material for rechargeable lithium batteries.
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Shape-controlled synthesis of Cu31S16-metal sulfide heteronanostructures via a two-phase approach

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC07568H, Communication
Miao Wang, Aiwei Tang, Lan Peng, Chunhe Yang, Feng Teng
A simple two-phase approach has been adopted to prepare a series of different-shaped Cu31S16-based heteronanostructures for the first time.
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Chiral Bronsted acid-catalysed enantioselective synthesis of isoindolinone-derived N(acyl),S-acetals

GA?id=C5CC08813E

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08813E, Communication
Josipa Suc, Irena Dokli, Matija Gredicak
Chiral Bronsted acid catalyzed synthesis of N(acyl),S-acetals from in situ generated ketimines proceeds in high yields and enantioselectivities.
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Preparation and applications of novel composites composed of metal-organic frameworks and two-dimensional materials

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC09127F, Feature Article
Shaozhou Li, Kai Yang, Chaoliang Tan, Xiao Huang, Wei Huang, Hua Zhang
The integration of metal-organic frameworks and two-dimensional materials has led to the improved performance in molecular absorption, separation and storage, and shown promise in selective catalysis and biosensing.
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All-inorganic cesium lead halide perovskite nanocrystals for photodetector applications

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08643D, Communication
Parthiban Ramasamy, Da-Hye Lim, Bumjin Kim, Seung-Ho Lee, Min-Sang Lee, Jong-Soo Lee
A simple and reproducible halide ion exchange method is reported, which can tune the optical properties in CsPbX3 (X = Cl, Br, and I) nanocrystals. CSPbI3 nanocrystals exhibit promising application in photodetectors.
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Construction of supramolecular polymer by enzyme-triggered covalent condensation of CB[8]-FGG-based supramonomer

GA?id=C5CC09103A

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC09103A, Communication
Zupeng Huang, Yu Fang, Quan Luo, Shengda Liu, Guo An, Chunxi Hou, Chao Lang, Jiayun Xu, Zeyuan Dong, Junqiu Liu
Enzymatic covalent condensation is employed for the first time to fabricate a supramolecular polymer from a CB[8]-FGG-based host-guest supramonomer.
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Solid-state polymerisation via [2+2] cycloaddition reaction involving coordination polymers

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08374E, Feature Article
Raghavender Medishetty, In-Hyeok Park, Shim Sung Lee, Jagadese J. Vittal
Recent advancements in the construction of cyclobutane polymers via photo-dimerisation reaction in the monocrystalline solids of metal complexes, coordination polymers and metal-organic framework structures are reviewed.
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Solvent-free liquid fluorene derivatives for organic semiconductor laser and optoelectronic applications

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Chem. Commun., 2015, Accepted Manuscript
DOI: 10.1039/C5CC08331A, Communication
Jean-Charles Ribierre, Li Zhao, Munetomo Inoue, Pierre-Olivier schwartz, Ju-Hyung Kim, Kou Yoshida, Atula Sandanayaka, Hajime Nakanotani, Loic Mager, Stephane Mery, Chihaya Adachi
Novel non-volatile fluidic highly fluorescent and charge-transporting fluorene derivatives functionalized with siloxane chains to provide a room temperature liquid state were synthesized and used in solvent-free liquid organic semiconductor lasers.
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Selenomethionine, p-cyanophenylalanine pairs provide a convenient, sensitive, non-perturbing fluorescent probe of local helical structure

GA?id=C5CC08232C

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC08232C, Communication
Ivan Peran, Matthew D. Watson, Osman Bilsel, Daniel P. Raleigh
Selenomethionine is a short range quencher of p-cyanophenylalanine fluorescence and these residues provide a site-specific probe of protein helical structure.
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Circular dichroism based refractive index sensing using chiral metamaterials

GA?id=C5CC07742G

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC07742G, Communication
Yizhuo He, Keelan Lawrence, Whitney Ingram, Yiping Zhao
A new strategy to improve the sensitivity of localized surface plasmon resonance sensors by employing chiral metamaterials is provided.
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Global Self-Propelled Sprayer Market 2015 Industry Trends, Growth, Analysis, Demand and Forecast

Global Self-Propelled Sprayer Industry 2015 The Global Self-Propelled Sprayer Industry report gives a comprehensive account of the Global Self-Propelled Sprayer market. Details such as the size, key players, segmentation, SWOT analysis, most influential trends, and business environment of the...

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Palliative care conundrums in an Ebola treatment centre

By Kristian Dye

Dhillon et al. present a case discussing the care of a patient with Ebola, which demonstrates in a micromedical-563427_1280cosm some of the biggest issues facing healthcare providers in patients with palliative or terminal care needs – albeit in a particular extreme care environment.

In the case, the patient is declared palliative and restarted on active management, before being considered palliative once again and passing away.

These are issues which perplex physicians in all care settings.

  1. When do we consider a patient for palliative
    care only?
  2. How can we reconcile differing beliefs and values within the team to deliver the best care for patients?

Deciding a patient is palliative

This is an issue that continues to vex physicians the world over. Cardona-Morrell and Hillman identify no less than 18 different scales and assessment tools available to attempt to guide these decisions, none of which are perfect.

Rightly, much of this effort is focused on identifying those within the population who are entering the end of life, and for whom discussions and decisions surrounding palliative care can help them to avoid invasive and unpleasant interventions – in the UK the Gold Standard Framework is the current tool used in community settings.

The difficulty with many of these tools is that they are not well-suited to the kind of case presented here. The 'normally fit but acutely unwell' patient presents a real problem for prognostication – where patients in similar situations receive the same care, some will still die, others stage recoveries that would make Lazarus jealous. In these situations, how can we make clinical judgement without losing the patient in the interest of treating clinical indicators?

Team-based approaches in palliative care

Palliative care is one of the areas of medical practice where personal values can have the biggest impact on the judgements physicians make. We all bring with us a multiple of baggage – emotional, cultural and religious – that colour our views.

A helpful summary of religious views on palliative care, by Steinberg, demonstrates the breadth of both agreement and disagreement between major religions on this topic.

Alongside this, our practice has to be informed by the ethical principles underpinning medical care. Respect for autonomy, the duty to act in the patient's best interest and the duty not to harm our patients are all critical to decisions around palliation of the dying patient – and all are open to interpretation by the practitioner.

What approaches can we take to ensure that judgement are taken by consensus, objectively, and within the context of the individual patient?



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A 120-year record of the spatial and temporal distribution of gravestone decay and acid deposition

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Publication date: February 2016
Source:Atmospheric Environment, Volume 127
Author(s): Howard D. Mooers, Avery R. Cota-Guertin, Ronald R. Regal, Anthony R. Sames, Amanda J. Dekan, Linnea M. Henkels
This investigation examines the spatial and temporal variability of marble gravestone decay throughout West Midlands County and adjacent portions of Warwickshire, Staffordshire, and Worcestershire. Gravestone decay has been used effectively as a quantitative measure of acid deposition. Numerous techniques have been used to assess gravestone decay and each is subject to different sources of error. To minimize error we focus only on marble gravestones that use the flush lead lettering technique. Decay of the marble leaves the lead lettering raised above the surface, and the distance can be measured with the use of a digital micrometer. Gravestone decay can be used to quantify the spatial and temporal distribution of acid deposition. Our gravestone decay database consists of 1417 individual measurements on 591 tombstones in 33 cemeteries and covers the period from 1860 to 2010. Sites range from industrial and residential areas to rural settings. These data allow us to establish the natural background rates of decay, the effects of urban/residential expansion, and the efficacy of environmental regulations. Decay rates vary from a minimum of 0.2 mm/century in remote rural areas to nearly 3.0 mm/century in the Birmingham City Center. The data are corrected for environmental variables, converted to acid deposition rates, and plotted at 10-year intervals from 1890 to 2010.



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Understanding how roadside concentrations of NOx are influenced by the background levels, traffic density, and meteorological conditions using Boosted Regression Trees

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Publication date: February 2016
Source:Atmospheric Environment, Volume 127
Author(s): Arwa Sayegh, James E. Tate, Karl Ropkins
Oxides of Nitrogen (NOx) is a major component of photochemical smog and its constituents are considered principal traffic-related pollutants affecting human health. This study investigates the influence of background concentrations of NOx, traffic density, and prevailing meteorological conditions on roadside concentrations of NOx at UK urban, open motorway, and motorway tunnel sites using the statistical approach Boosted Regression Trees (BRT). BRT models have been fitted using hourly concentration, traffic, and meteorological data for each site. The models predict, rank, and visualise the relationship between model variables and roadside NOx concentrations. A strong relationship between roadside NOx and monitored local background concentrations is demonstrated. Relationships between roadside NOx and other model variables have been shown to be strongly influenced by the quality and resolution of background concentrations of NOx, i.e. if it were based on monitored data or modelled prediction. The paper proposes a direct method of using site-specific fundamental diagrams for splitting traffic data into four traffic states: free-flow, busy-flow, congested, and severely congested. Using BRT models, the density of traffic (vehicles per kilometre) was observed to have a proportional influence on the concentrations of roadside NOx, with different fitted regression line slopes for the different traffic states. When other influences are conditioned out, the relationship between roadside concentrations and ambient air temperature suggests NOx concentrations reach a minimum at around 22 °C with high concentrations at low ambient air temperatures which could be associated to restricted atmospheric dispersion and/or to changes in road traffic exhaust emission characteristics at low ambient air temperatures. This paper uses BRT models to study how different critical factors, and their relative importance, influence the variation of roadside NOx concentrations. The paper highlights the importance of either setting up local background continuous monitors or improving the quality and resolution of modelled UK background maps and the need to further investigate the influence of ambient air temperature on NOx emissions and roadside NOx concentrations.



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A Novel Statistical Approach for Brain MR Images Segmentation Based on Relaxation Times

Brain tissue segmentation in Magnetic Resonance Imaging is useful for a wide range of applications. Classical approaches exploit the gray levels image and implement criteria for differentiating regions. Within this paper a novel approach for brain tissue joint segmentation and classification is presented. Starting from the estimation of proton density and relaxation times, we propose a novel method for identifying the optimal decision regions. The approach exploits the statistical distribution of the involved signals in the complex domain. The technique, compared to classical threshold based ones, is able to globally improve the classification rate. The effectiveness of the approach is evaluated on both simulated and real datasets.

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The Effect of Perioperative Ischemia and Reperfusion on Multiorgan Dysfunction following Abdominal Aortic Aneurysm Repair

Abdominal aortic aneurysms (AAAs) are relatively common and are potentially life-threatening medical problems. The aim of this review is to provide an overview of the effect of I/R injury on multiorgan failure following AAA repair. The PubMed, CINAHL, EMBASE, Medline, Cochrane Review, and Scopus databases were comprehensively searched for articles concerning the pathophysiology of I/R and its systemic effects. Cross-referencing was performed using the bibliographies from the articles obtained. Articles retrieved were restricted to those published in English. One of the most prominent characteristics of AAA open repair is the double physiological phenomenon of ischemia-reperfusion (I/R) that happens either at the time of clamping or following the aortic clamp removal. Ischemia-reperfusion injury causes significant pathophysiological disturbances to distant organs, increasing the possibility for postoperative multiorgan failure. Although tissue injury is mediated by diverse mechanisms, microvascular dysfunction seems to be the final outcome of I/R.

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Synchronous ipsilateral adrenocortical carcinoma and renal cell carcinoma: a rare clinical entity

Synchronous ipsilateral adrenocortical carcinoma (ACC) and renal cell carcinoma (RCC) are rare. Radiological imaging may not in all cases differentiate between the two tumours due to their proximity to each other. We encountered a case where preoperative diagnosis of renal cell carcinoma was made based on the radiological imaging but, following radical nephrectomy, this was found to be synchronous ACC and RCC after histopathological examination. The patient is doing well at 12 months of follow-up, with no clinical or radiological recurrence.



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Floating iris cyst mimicking intravitreal cysticercosis

Description

A 12-year-old girl presented with a history of repeated headaches (with no ocular symptoms) for 3 years. There was no history of ocular trauma or surgery. On ocular examination elsewhere, she was diagnosed as having intravitreal cysticercosis after observing a cyst in the left eye and was referred for vitrectomy to a tertiary eye care centre.

Her vision was 20/20 in both eyes, with no signs of ocular inflammation. Biomicroscopic examination of the left eye showed a mobile, pigmented, circular cyst in the anterior vitreous, but it was not blocking the pupillary axis (figure 1). Intraocular pressure and fundus examination of both eyes was normal. Ultrasonography revealed a free-floating cyst with no scolex in the anterior vitreous. Ultrasound biomicroscopy did not show any other cyst or mass in the iris and ciliary body. Non-contrast head CT of the brain and orbit ruled out intracranial cysticercosis. The...



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Rare cause of paraparesis: bilateral obturator neuropathy after hysterosalpingectomy

Bilateral obturator nerve injury during pelvic surgery is an infrequent cause of lower limb paraparesis. We report the case of a 45-year-old woman with a large uterine leiomyoma who underwent simple total hysterectomy and bilateral salpingectomy. At 24 h after the surgery, the patient noticed loss of muscle strength when adducting both legs. She had no problem with other movements and no sensory or sphincter abnormalities. Neurological examination confirmed that there was loss of strength only in the adductor muscles, with preserved sensory function and reflexes, suggesting bilateral obturator nerve involvement. Pelvic MRI showed a small postsurgical haematoma in the Douglas recess, but far from the obturator nerves. 2 weeks later, electromyography showed positive sharp waves and low motor unit recruitment in the adductor magnus muscles, confirming acute, bilateral obturator nerve neuropathy. The few cases of bilateral obturator neuropathy that have been reported were mostly related to abdominopelvic interventions.



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Thymoma complicated by deep vein thrombosis of the arm

Description

Our patient was referred urgently with an anterior neck lump. The patient was otherwise well with no history of smoking or radiation exposure. Initial investigation with ultrasound-guided aspiration cytology was suspicious and atypical for thyroid carcinoma. A CT scan demonstrated the neck lump was part of a 64x56x54 mm retrosternal mass infiltrating the superior vena cava and atrium (figure 1).

Figure 1

CT scan demonstrating deep extension of retrosternal lesion into the anterior mediastinum, where a more focal 64x56x54 mm mass is seen. The mass is partly cystic, centred towards the left of the anterior mediastinum, and directly infiltrates the superior vena cava and atrium.

Surgical biopsy and histological analysis demonstrated a mixed widely invasive thymoma P1 prominent with some P2 elements, Masaoka stage 3. A positron emission tomography-CT scan was arranged to identify any signs of metastasis (figure 2)....



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Two cases of small bowel obstruction secondary to a swallowed potato

Bowel obstruction due to bezoars (compaction of ingested material within the gastrointestinal tract) is a rare, but well documented occurrence. In this paper, we present two cases of potato-induced small bowel obstruction. Both patients were approximately 50 years old and had cerebral palsy and learning disabilities, respectively. They presented with abdominal pain and bilious vomiting, with no medical or surgical history. Diagnosis of small bowel obstruction was confirmed by CT prior to taking the patients to the operating theatre, where whole potatoes were found to be obstructing each patient's bowel lumen. Both patients underwent laparotomy with enterotomy and removal of the potato. They both made a good recovery. Through a literature review of bezoar-induced bowel obstruction, these cases highlight important diagnostic and management principles.



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Combined pulmonary fibrosis and emphysema in hypersensitivity pneumonitis

Combined pulmonary fibrosis and emphysema is a distinct syndrome reported in patients who smoke. A 72-year-old, never-smoking female dairy farmer was referred for progressive dyspnoea on exertion, basal crackles on auscultation, normal spirometry and normal lung volumes but decreased diffusing capacity of the lung for carbon monoxide, centrilobular emphysema in the upper zones of the lungs and diffuse infiltrative lung disease in the lower zones on high-resolution CT scan. Bronchoalveolar lavage differential cell count showed 35% lymphocytosis, and precipitating antibodies for Wallemia sebi, Trichoderma species and Cladosporium sphaerospermum were identified. The diagnosis of farmer's lung disease with combined pulmonary fibrosis and emphysema was retained. This case highlights for the first time that hypersensitivity pneumonitis should be suspected in the setting of combined pulmonary fibrosis and emphysema in non-smoking patients.



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Hydrogeomorphology in Ethiopia as impacted by human interventions



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Runoff response of reforesting tropical mountain catchments: the case of western Rift Valley escarpment of Northern Ethiopia



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Runoff response to gully control measures in northern Ethiopia



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How successful is gully erosion control: a review on improved land management schemes and their effect



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The role of lacustrine plains in the sediment budget: the case of Lake Tana Basin, Ethiopia



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Impact of deforestation on physico-chemical soil characteristics in the highlands of south-western Ethiopia



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Corporate land acquisition and local people's reaction in western Ethiopian lowlands



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Land cover changes as impacted by rainfall variability in the escarpments of the Ethiopian Rift Valley



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Monitoring gully headcut retreat over a rainy season using image-based modelling: an example from Northern Ethiopia



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PulmCrit- Neurocritical care of the comatose meningitis patient

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Early in my training I had a few comatose meningitis patients. They were admitted, given antibiotics, and supported on a ventilator. They died. For a while, I believed that this condition was fairly hopeless. Then I encountered a comatose young man with meningitis due to adjacent mastoiditis. His lumbar puncture opening pressure was ~50cm. Following mastoidectomy and temporary placement of a lumbar drain, he recovered. Since then, I have been increasingly aggressive about managing this. Some patients have responded surprisingly well.

EMCrit by Josh Farkas.



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EMAS position statement: Non-hormonal management of menopausal vasomotor symptoms



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Answer to the comment by Per Eystein Lonning on 'The serum estradiol concentration is the main determinant of the estradiol concentration in normal breast tissue'



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Model-based visualization and understanding of monomer sequence formation in the synthesis of gradient copoly(2-oxazoline)s

For the first time, the formation of monomer sequences of individual macromolecules during cationic ring-opening copolymerization (CROcoP) of 2-methyl-2-oxazoline (MeOx) and 2-phenyl-2-oxazoline (PhOx) in acetonitrile (3 mol L-1; 100-140 degrees C; target degree of polymerization (DP): 50-400) is visualized via kinetic Monte Carlo simulations with model parameters optimized based on experimental data. It is shown that chain transfer via beta-elimination and branching reactions are required to describe the experimental data. At complete monomer conversion for target DPs below 200, at most 5% of the chains are macromonomers and the average number of branches per chain remains below 15%. A higher amount of chains with a defined, steeper MeOx to PhOx gradient is obtained by lowering the polymerization temperature albeit at the expense of polymerization time. The simulations results highlight the great potential of CROcoP of 2-oxazolines for the direct synthesis of well-defined steep gradient copolymers.

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Implementation of an HPV vaccination program in Eldoret, Kenya: results from a qualitative assessment by key stakeholders

Background: Cervical cancer strikes hard in low-resource regions yet primary prevention is still rare. Pilot projects have however showed that Human Papillomavirus (HPV) vaccination programs can attain high uptake. Nevertheless, a study accompanying a vaccination demonstration project in Eldoret, Kenya, revealed less encouraging outcomes: uptake during an initial phase targeting ten schools (i.e., 4000 eligible girls), was low and more schools had to be included to reach the proposed number of 3000 vaccinated girls. The previously conducted study also revealed that many mothers had not received promotional information which had to reach them through schools: teachers were sensitized by health staff and asked to invite students and parents for HPV vaccination in the referral hospital. In this qualitative study, we investigate factors that hampered promotion and vaccine uptake. Methods: Focus group discussions (FGD) with teachers (4) and fathers (3) were organized to assess awareness and attitudes towards the vaccination program, cervical cancer and the HPV vaccine, as well as a FGD with the vaccinators (1) to discuss the course of the program and potential improvements. Discussions were recorded, transcribed, translated, and analyzed using thematic analysis In addition, a meeting with the program coordinator was set up to reflect upon the program and the results of the FGD, and to formulate recommendations for future programs. Results: Cervical cancer was poorly understood by fathers and teachers and mainly linked with nonconforming sexual behavior and modern lifestyle. Few had heard about the vaccination opportunity: feeling uncomfortable to discuss cervical cancer and not considering it as important had hampered information flow. Teachers requested more support from health staff to address unexpected questions from parents. Non-uptake was also the result of distrust towards new vaccines. Schools entering the program in the second phase reacted faster: they were better organized, e.g., in terms of transport, while the community was already more familiarized with the vaccine. Conclusions: Close collaboration between teachers and health staff is crucial to obtain high HPV vaccine uptake among schoolgirls. Promotional messages should, besides providing correct information, tackle misbeliefs, address stigma and stress the priority to vaccinate all, regardless of lifestyle. Monitoring activities and continuous communication could allow for detection of rumors and unequal uptake in the community.

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Antipsychotica of andere psychotrope middelen en het risico op sterfte bij patiënten met dementie

Een recent retrospectief observationeel onderzoek met matching voor verschillende confounders onderzocht het absolute risico op mortaliteit 180 dagen na gebruik van een antipsychoticum, valproïnezuur of een antidepressivum ten opzichte van geen behandeling bij 90 786 patiënten ouder dan 65 jaar met dementie. In een secundaire analyse onderzocht men het dosisafhankelijke absolute risico op sterfte voor olanzapine, quetiapine en risperidon. De absolute oversterfte voor gebruikers van antipsychotica versus geen gebruikers varieerde van 3,8% (95% BI van 1,0% tot 6,6%; p<0,01) met een NNH van 26 (95% BI van 15 tot 99) voor haloperidol tot 2,0% (95% BI van 0,7% tot 3,3%; p<0,01) met een NNH van 50 (95% BI van 30 tot 150) voor quetiapine. Ook antidepressiva waren geassocieerd met een kleine statistisch significante verhoging in mortaliteit van 0,6% (95% BI van 0,3 tot 0,9) met een NNH van 166 (95% BI van 107 tot 362). Na correctie voor leeftijd, geslacht, aantal jaren dementie, aanwezigheid van delier en andere klinische en demografische kenmerken zag men ook in vergelijking met antidepressiva een toename in mortaliteit van 12,3% (95% BI van 8,6% tot 16%; p<0,01) met haloperidol en van 3,2% (95% BI van 1,6% tot 4,9%; p<0,01) met quetiapine. Met valproïnezuur kon er geen verhoging in mortaliteit aangetoond worden. Als klasse vertoonden de atypische antipsychotica (risperidon, olanzapine, quetiapine) een verhoging van de mortaliteit met 3,5% (95% BI van 0,5% tot 6,5%;p=0,02) in de hoog gedoseerde subgroep versus de laag gedoseerde subgroep. Ondanks de uitgebreidheid van deze observationele studie, waarbij men met heel wat confounders rekening hield, wijzen we er toch op dat men voor enkele belangrijke prognostische gegevens zoals ernst van dementie en gedrags-en psychiatrische symptomen niet kon corrigeren.

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Exploiting hydrophobic borohydride-rich ionic liquids as faster-igniting rocket fuels

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC09737A, Communication
Tianlin Liu, Xiujuan Qi, Shi Huang, Linhai Jiang, Jianling Li, Chenglong Tang, Qinghua Zhang
A new family of hypergolic ionic liquids with ultra-short ignition delay times was designed and synthesized as potential rocket fuels.
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Sequential meta-C-H olefination of synthetically versatile benzyl silanes: effective synthesis of meta-olefinated toluene, benzaldehyde and benzyl alcohols

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Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC09446A, Communication
Open Access Open Access
Tuhin Patra, Rahul Watile, Soumitra Agasti, Togati Naveen, Debabrata Maiti
Template assisted sequential meta-C-H bis-olefination was achieved for synthetically versatile benzyl silanes with post synthetic modifications towards different useful functionalities.
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Correction: Self-assembly of the anti-fungal polyene amphotericin B into giant helically-twisted nanotapes

Chem. Commun., 2016, Advance Article
DOI: 10.1039/C5CC90557E, Correction
Open Access Open Access
Creative Commons Licence  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Ian William Hamley, Steven Kirkham, Radoslaw M. Kowalczyk, Valeria Castelletto, Mehedi Reza, Janne Ruokolainen
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