Low hydrophilicity of graphene is one of the major obstacles for biomaterials application. To create some hydrophilic groups on graphene is addressed this issue. Herein, COOH+ ion implantation modified graphene (COOH+/graphene) and COOH functionalized graphene were designed by physical ion implantation and chemical methods, respectively. The structure and surface properties of COOH+/graphene an...

in this paper, we present a simple method for preparation of graphene-zno nanocomposites (g-zno). the method is based on thermal treatment of the graphene oxide (go)/zno paste which reduces the graphene oxide into the graphene and leads to the formation of the g-zno nanocomposite. the structure, morphology and optical properties of synthesized nanocomposites are characterized with xrd, fesem, f...

We describe a case of native coarctation of aorta managed with three self-expandable nitinol stents. After balloon pre-dilation, the first and second stents were dislodged. The coarcted area was successfully treated with the third stent overlapped with the previous stents. During follow up (30 months), the patient was free of complications. It seems that implantation of multiple overlapping sel...

The non-overlapping sets of pictures are sets such that no two pictures in the set (properly) overlap. They are the generalization to two dimensions of the cross-bifix-free sets of strings. Non-overlapping sets of pictures are non-expandable when no other picture can be added without violating the property. We present a construction of non-expandable non-overlapping (NENO) sets of pictures and ...

Esophageal perforation has a high rate of mortality. Many strategies have been advocated for its management. Therapeutic options are surgical repair or resection, endoscopic placement of self-expandable metallic stents or, in selected cases, conservative management.We describe a case of a 75-year-old man admitted to our hospital for forceful vomiting since 24 hours. The patient was treated with...

We introduce a notion of manufactured dimension function (with values in R∪{−∞}) for the generic model of a Ramsey-expandable class of finite structures. This idea allows us to extract an automorphism-invariant dimension from a Hrushovski-style psuedo-finite dimension function as presented in [12, 13]. Adapting the technique of [6], we demonstrate that the existence of a manufactured dimension ...

Esophageal stenting has been shown to be a convenient and long-lasting method of palliation for malignant dysphagia.1 Use of covered self-expandable metal stents (SEMS) and, more recently, self-expandable plastic stents (SEPS)2 has led to increased success rate in the palliative treatment of malignant strictures of the esophagus. Experience with SEPS is scant. We report our experience with the ...

BACKGROUND This report describes a one-step insertion of an expandable metallic stent to treat obstructive jaundice due to unresectable common bile duct carcinoma. METHODS A percutaneous transhepatic cholangiogram is obtained, and the bile duct obstruction is negotiated with a guide wire. After advancing the catheter into the duodenum, contrast material is injected to measure the length of th...

Transcatheter treatment of aortic coarctation, with balloon angioplasty or stent implantation, is now an acceptable alternative to surgical repair. However these procedures may result in complications, such as vascular wall injury and re-stenosis of the lesion. A nitinol self-expandable stent, when deployed at the coarctation site, produces low constant radial force, which may result in a gradu...