Topological Transition in Spontaneously Formed Cellulosic Liquid-Crystalline Microspheres in a w/o Emulsion.

A cholesteric liquid crystal (ChLC) in a confined space has attracted significant scientific interest and has potential applications. ChLC microspheres have been obtained by devising processing such as a microfluidic technique. Herein, we adopted the self-assembly approach for the spontaneous formation of cellulosic ChLC microspheres. A functional block copolymer (BCP) was grafted to hydroxypropyl cellulose (HPC), making it amphiphilic to self-assembly in a w/o emulsion. The HPC segment aggregated in the aqueous phase under lyotropic conditions and produced the ChLC microspheres dispersed in the oil phase. The microspheres exhibited a topological transition between radial and bipolar while altering the molecular structure in terms of the molecular weight of BCP and the degree of substitution of HPC. The coexistence of inorganic salts in the aqueous HPC lyotropic phase changed the mesophase behavior as well. Such cellulosic ChLC microspheres will present opportunities to develop biobased optical devices and stimuli-responsive biomedical materials.

The impact of a psychosocial program on clinical outcomes for severe psychiatric disorders.

BACKGROUND: This retrospective study evaluated the impact of a psychosocial program on individuals with severe and chronic psychiatric disorders. This study also examined potential modifiable predictors of hospitalization. METHODS: The sample was comprised of 94 individuals with severe and chronic mental illness who were followed in the Community Support Network (CSN), a psychosocial program. Data from initial assessment at admission to the CSN were compared with the last assessment after admission, during data abstraction. Data were analyzed using analysis of variance for hospitalization, accommodation (housing), and employment, and the logistic regression procedure was used to analyze the relationship among potential modifiable clinical independent variables and hospitalization. RESULTS: Admission to CSN significantly reduced hospitalization rates. Presence of psychotic symptoms increased the likelihood of hospitalization, and the use of support groups, antidepressants, and mood stabilizers decreased the risk for hospitalization. CONCLUSIONS: Our findings suggest that CSN reduced hospitalization rates as well as increased employment, and the switch from the Assertive Community Treatment program to the Community Support Team program in 2007 did not change this effect. The overall significant reduction in psychiatric symptoms could explain these positive findings.

Tailor-Made Fluorinated Copolymer/Clay Nanocomposite by Cationic RAFT Assisted Pickering Miniemulsion Polymerization.

Fluorinated polymers in emulsion find enormous applications in hydrophobic surface coating. Currently, lots of efforts are being made to develop specialty polymer emulsions which are free from surfactants. This investigation reports the preparation of a fluorinated copolymer via Pickering miniemulsion polymerization. In this case, 2,2,3,3,3-pentafluoropropyl acrylate (PFPA), methyl methacrylate (MMA), and n-butyl acrylate (nBA) were copolymerized in miniemulsion using Laponite-RDS as the stabilizer. The copolymerization was carried out via reversible addition-fragmentation chain transfer (RAFT) process. Here, a cationic RAFT agent, S-1-dodecyl-S'-(methylbenzyltriethylammonium bromide) trithiocarbonate (DMTTC), was used to promote polymer-Laponite interaction by means of ionic attraction. The polymerization was much faster when Laponite content was 30 wt % or above with 1.2 wt % RAFT agent. The stability of the miniemulsion in terms of zeta potential was found to be dependent on the amount of both Laponite and RAFT agent. The miniemulsion had particle sizes in the range of 200-300 nm. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) analyses showed the formation of Laponite armored spherical copolymer particles. The fluorinated copolymer films had improved surface properties because of polymer-Laponite interaction.

Long-term cognitive effects of COVID-19 studied with repeated neuropsychological testing.

COVID-19 has a wide range of clinical manifestations. Apart from respiratory symptoms, neurological manifestations and cognitive impairment are commonly seen. Due to lack of a clear consensus on the definition of long COVID a pragmatic approach of assessing change from neurological baseline has become prevalent. We present the case of a high functioning woman in her late 40s who had a mild course of acute illness but developed cognitive difficulties. No organic causes for her cognitive difficulties were found. Neuropsychological testing showed impairment in right frontal lobe functioning. The patient showed a response to empirical treatment with Attention deficit hyperactivity disorder (ADHD) medications. Repeat neuropsychological testing 1 year later showed continued dysfunction in executive functioning. We present the details of her test findings and discuss the proposed pathophysiology behind neurocognitive effects of long COVID.

Cancer Cell-Selective Inhibition of Migration by Styrenic Catiomer Emulsions.

Cancer metastasis remains the most formidable cause of mortality and morbidity in cancer patients. Developing an effective and economical method toward cancer antimetastatic strategy demands immediate attention in anticancer therapy. Herein, we followed a cost-effective greener method for preparing a small family of amphiphilic catiomers with varied styrene content (45, 63, and 83%), which revealed the unique potential of promoting normal cell migration while retarding cancer metastasis. The styrenic polymers formed micellar self-assembly in aqueous phase and exhibited a cationic charge. Polymers were quite nontoxic up to 200 µg/mL concentration toward human embryonic kidney cell HEK293 as well as human, triple negative breast cancer cell MDAMB-231, mouse melanoma cell B16F10, and human oral squamous carcinoma cell FaDu. Confocal imaging and fluorescence activated cell sorting (FACS) showed effective incorporation of polymers within cells. Interestingly, the polymer-treated HEK293 cells underwent prominent wound healing in scratch assay. However, the as-synthesized polymer-treated cancer cells resisted migration as analyzed from the scratch assay. A mechanistic study using immunoblotting assay established upregulation of migratory proteins vimentin and TGF-ß and downregulation of E-cadherin in normal HEK293 cells. Remarkably, this trend was completely reversed in cancer cell MDAMB-231. This study describes the extraordinary potential of styrenic catiomers as wound healers for normal cells while inhibiting cancer metastasis.

Increasing Abnormal Involuntary Movement Scale (AIMS) Screening for Tardive Dyskinesia in an Outpatient Psychiatry Clinic: A Resident-Led Outpatient Lean Six Sigma Initiative.

Objective To increase compliance with Abnormal Involuntary Movement Score (AIMS) documentation for patients taking antipsychotics to recognize and treat tardive dyskinesia in the psychiatry outpatient clinic. Methods The Lean Six Sigma quality improvement (QI) model, utilizing DMAIC steps of define, measure, analyze, improve, control, was followed. Psychiatry attendings and residents were surveyed to assess reasons for AIMS non-documentation, and they ranked their preferred solutions to increase compliance. A random sample of patient charts for individuals on antipsychotic medications was obtained to determine AIMS documentation compliance prior to and following the implementation of improvements. Results The most highly ranked solution was implementing a one-hour AIMS training session. Three months post-intervention, a random sample of 60 patient charts showed that 87% (52/60) of patients had AIMS documented which was a significant increase compared to 3% (1/30) pre-intervention (p<0.001). Conclusion An annual, one-hour AIMS training session for residents improved rates of AIMS documentation.

Recognition of Hg2+ and Cr3+ in physiological conditions by a rhodamine derivative and its application as a reagent for cell-imaging studies.

A new rhodamine-based receptor, derivatized with an additional fluorophore (quinoline), was synthesized for selective recognition of Hg(2+) and Cr(3+) in an acetonitrile/HEPES buffer medium of pH 7.3. This reagent could be used as a dual probe and allowed detection of these two ions by monitoring changes in absorption and the fluorescence spectral pattern. In both instances, the extent of the changes was significant enough to allow visual detection. More importantly, the receptor molecule could be used as an imaging reagent for detection of Hg(2+) and Cr(3+) uptake in live human cancer cells (MCF7) using laser confocal microscopic studies. Unlike Hg(ClO(4))(2) or Hg(NO(3))(2) salts, HgCl(2) or HgI(2) failed to induce any visually detectable change in color or fluorescence upon interaction with L(1) under identical experimental conditions. Presumably, the higher covalent nature of Hg(II) in HgCl(2) or HgI(2) accounts for its lower acidity and its inability to open up the spirolactam ring of the reagent L(1). The issue has been addressed on the basis of the single-crystal X-ray structures of L(1)·HgX(2) (X(-) = Cl(-) or I(-)) and results from other spectral studies.

First synthesis and antiprotozoal activities of divinyl sulfone-modified carbohydrates.

Divinyl sulfone-modified carbohydrates have been synthesized for the first time by reacting easily available carbohydrate epoxides with thioethanol in a regiospecific fashion. One of the modified divinyl sulfones initiated significant cell death in Entamoeba species and the influence of the anomeric configurations on the biological activities of these sugar-derived divinyl sulfones has been highlighted. The most active compound in this series was found to be devoid of any toxicity.

Recent Advances in Nanocellulose Composites with Polymers: A Guide for Choosing Partners and How to Incorporate Them.

In recent years, the research on nanocellulose composites with polymers has made significant contributions to the development of functional and sustainable materials. This review outlines the chemistry of the interaction between the nanocellulose and the polymer matrix, along with the extent of the reinforcement in their nanocomposites. In order to fabricate well-defined nanocomposites, the type of nanomaterial and the selection of the polymer matrix are always crucial from the viewpoint of polymer⁻filler compatibility for the desired reinforcement and specific application. In this review, recent articles on polymer/nanocellulose composites were taken into account to provide a clear understanding on how to use the surface functionalities of nanocellulose and to choose the polymer matrix in order to produce the nanocomposite. Here, we considered cellulose nanocrystal (CNC) and cellulose nanofiber (CNF) as the nanocellulosic materials. A brief discussion on their synthesis and properties was also incorporated. This review, overall, is a guide to help in designing polymer/nanocellulose composites through the utilization of nanocellulose properties and the selection of functional polymers, paving the way to specific polymer⁻filler interaction.

Tailor-made polyfluoroacrylate and its block copolymer by RAFT polymerization in miniemulsion; improved hydrophobicity in the core-shell block copolymer.

Controlled/living radical polymerization (CRP) of a fluoroacrylate was successfully carried out in miniemulsion by Reversible Addition Fragmentation chain Transfer (RAFT) process. In this case, 2,2,3,3,4,4,4-heptafluorobutyl acrylate (HFBA) was polymerized using 2-cyanopropyl dodecyl trithiocarbonate (CPDTC) as RAFT agent, Triton X-405 and sodium dodecyl sulfonate (SDS) as surfactant, and potassium persulphate (KPS) or 2,2'-azobis isobutyronitrile (AIBN) as initiator. Being compatible with hydrophobic fluoroacrylate, this RAFT agent offered very high conversion and good control over the molecular weight of the polymer. The miniemulsion was stable without any costabilizer. The long chain dodecyl group (-C12H25) (Z-group in the RAFT agent) had beneficial effect in stabilizing the miniemulsion. When 2-cyano 2-propyl benzodithioate (CPBD) (Z=-C6H5) was used as RAFT agent, the conversion was less and particle size distribution was very broad. Block copolymerization with butyl acrylate (BA) using PHFBA as macro-RAFT agent showed core-shell morphology with the aggregation of PHFBA segment in the shell. GPC as well as DSC analysis confirmed the formation of block copolymer. The core-shell morphology was confirmed by TEM analysis. The block copolymers (PHFBA-b-PBA) showed significantly higher water contact angle (WCA) showing much better hydrophobicity compared to PHFBA alone.

Status epilepticus following electroconvulsive therapy.

Electro convulsive therapy (ECT) induced status epilepticus is known to occur in patients undergoing ECT. Its recognition and management under general anesthesia are of paramount importance; otherwise it may endanger the life of the individual.

Visual hallucinations in mania.

Visual hallucinations occur in a wide variety of neurological and psychiatric disorders, including toxic disturbances, drug withdrawal syndromes, focal central nervous system lesions, migraine headaches, blindness, schizophrenia, and psychotic mood disorders. Visual hallucinations are generally assumed to characteristically reflect organic disorders and are very rare in affective disorders. Here, we present a case of visual hallucinations in a young female with bipolar illness during the manic phase.