Co3O4 Nanocrystals on Graphene as a Synergistic Catalyst for Oxygen Reduction Reaction

Catalysts for oxygen reduction and evolution reactions are at the heart of key renewable energy technologies including fuel cells and water splitting. Despite tremendous efforts, developing oxygen electrode catalysts with high activity at low costs remains a grand challenge. Here, we report a hybrid material of Co3O4 nanocrystals grown on reduced graphene oxide (GO) as a high-performance bi-functional catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). While Co3O4 or graphene oxide alone has little catalytic activity, their hybrid exhibits an unexpected, surprisingly high ORR activity that is further enhanced by nitrogen-doping of graphene. The Co3O4/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions. The same hybrid is also highly active for OER, making it a high performance non-precious metal based bi-catalyst for both ORR and OER. The unusual catalytic activity arises from synergetic chemical coupling effects between Co3O4 and graphene.Comment: published in Nature Material

Safe Step Act:does it undermine step therapy?

Drug expenditure in the United States has continued to increase unsustainably; the specialty of dermatology has been particularly affected. Resources are limited - someone has to make decisions about what treatments will be covered and how they will be reimbursed. Step therapy is a cost-control method used by insurers to encourage the use of the most cost-effective treatments before more expensive options are attempted. However, a rigid step therapy policy can be problematic when protocols are out of date, or delay necessary treatment leading to unnecessary suffering, increased morbidity, and overall cost. To address some of these concerns, the proposed Safe Step Act (S. 2546 and H.R. 2279) attempts to create a requirement that insurers provide a transparent, expeditious exceptions process for step therapy protocols. Increased flexibility in this process will allow for the unique circumstances of individual patients and improve access to expensive drugs for special cases. However, this bill may be exploited, further weakening insurers' ability to negotiate on cost. We should be cautious about measures that reduce the effectiveness of this tool, particularly if we, as a society, aim to expand access to basic care to all Americans.</p

Antimony-doped graphene nanoplatelets

Heteroatom doping into the graphitic frameworks have been intensively studied for the development of metal-free electrocatalysts. However, the choice of heteroatoms is limited to non-metallic elements and heteroatom-doped graphitic materials do not satisfy commercial demands in terms of cost and stability. Here we realize doping semimetal antimony (Sb) at the edges of graphene nanoplatelets (GnPs) via a simple mechanochemical reaction between pristine graphite and solid Sb. The covalent bonding of the metalloid Sb with the graphitic carbon is visualized using atomic-resolution transmission electron microscopy. The Sb-doped GnPs display zero loss of electrocatalytic activity for oxygen reduction reaction even after 100,000 cycles. Density functional theory calculations indicate that the multiple oxidation states (Sb3+ and Sb5+) of Sb are responsible for the unusual electrochemical stability. Sb-doped GnPs may provide new insights and practical methods for designing stable carbon-based electrocatalystsclose0

Safe Step Act:does it undermine step therapy?

Drug expenditure in the United States has continued to increase unsustainably; the specialty of dermatology has been particularly affected. Resources are limited - someone has to make decisions about what treatments will be covered and how they will be reimbursed. Step therapy is a cost-control method used by insurers to encourage the use of the most cost-effective treatments before more expensive options are attempted. However, a rigid step therapy policy can be problematic when protocols are out of date, or delay necessary treatment leading to unnecessary suffering, increased morbidity, and overall cost. To address some of these concerns, the proposed Safe Step Act (S. 2546 and H.R. 2279) attempts to create a requirement that insurers provide a transparent, expeditious exceptions process for step therapy protocols. Increased flexibility in this process will allow for the unique circumstances of individual patients and improve access to expensive drugs for special cases. However, this bill may be exploited, further weakening insurers' ability to negotiate on cost. We should be cautious about measures that reduce the effectiveness of this tool, particularly if we, as a society, aim to expand access to basic care to all Americans.</p

Safe Step Act: does it undermine step therapy?

Drug expenditure in the United States has continued to increase unsustainably; the specialty of dermatology has been particularly affected. Resources are limited - someone has to make decisions about what treatments will be covered and how they will be reimbursed. Step therapy is a cost-control method used by insurers to encourage the use of the most cost-effective treatments before more expensive options are attempted. However, a rigid step therapy policy can be problematic when protocols are out of date, or delay necessary treatment leading to unnecessary suffering, increased morbidity, and overall cost. To address some of these concerns, the proposed Safe Step Act (S. 2546 and H.R. 2279) attempts to create a requirement that insurers provide a transparent, expeditious exceptions process for step therapy protocols. Increased flexibility in this process will allow for the unique circumstances of individual patients and improve access to expensive drugs for special cases. However, this bill may be exploited, further weakening insurers' ability to negotiate on cost. We should be cautious about measures that reduce the effectiveness of this tool, particularly if we, as a society, aim to expand access to basic care to all Americans

Safe Step Act:does it undermine step therapy?

Drug expenditure in the United States has continued to increase unsustainably; the specialty of dermatology has been particularly affected. Resources are limited - someone has to make decisions about what treatments will be covered and how they will be reimbursed. Step therapy is a cost-control method used by insurers to encourage the use of the most cost-effective treatments before more expensive options are attempted. However, a rigid step therapy policy can be problematic when protocols are out of date, or delay necessary treatment leading to unnecessary suffering, increased morbidity, and overall cost. To address some of these concerns, the proposed Safe Step Act (S. 2546 and H.R. 2279) attempts to create a requirement that insurers provide a transparent, expeditious exceptions process for step therapy protocols. Increased flexibility in this process will allow for the unique circumstances of individual patients and improve access to expensive drugs for special cases. However, this bill may be exploited, further weakening insurers' ability to negotiate on cost. We should be cautious about measures that reduce the effectiveness of this tool, particularly if we, as a society, aim to expand access to basic care to all Americans.</p

Mycophenolate mofetil as adjunctive therapy to corticosteroids for the treatment of pyoderma gangrenosum:a case series and literature review

Pyoderma gangrenosum is a rare neutrophilic dermatosis that is commonly treated with systemic corticosteroids; however, their potent side effects may warrant tapering, and non-steroidal systemic immunosuppressants may help maintain or bolster disease clearance during weaning. Although cyclosporine is regarded as a favorable corticosteroid-sparing agent, it is associated with several side effects, such as renal toxicity and hypertension, that may limit its feasibility. Mycophenolate mofetil is a well-tolerated alternative with limited data. Institutional review board approval was obtained to review patients from a single institution who received mycophenolate mofetil for pyoderma gangrenosum between January 1, 2010, and December 31, 2019. A systematic MEDLINE (PubMed) review was performed of articles containing linked keywords: “mycophenolate mofetil” and “pyoderma gangrenosum”. Patient demographics, presentation details, and treatment regimen characteristics were recorded. Fourteen of our pyoderma gangrenosum patients were treated with mycophenolate mofetil concomitantly with prednisone. Ninety-three percent of our patients achieved improvement within 12 months (mean 4.5 months), including five patients who experienced complete healing. Outcomes in literature patients were comparable; 77% either improved or maintained clearance with mycophenolate mofetil. Greater than 80% of total patients experienced healing or adequate disease control at a median dose of 2000 mg daily. The most common side effects of mycophenolate mofetil were myelosuppression and gastrointestinal upset, which were both seen in 18% of patients. Although this study is subject to publication bias, mycophenolate mofetil appears to be an efficacious and well-tolerated adjunctive therapy option for pyoderma gangrenosum.</p