Isocyanide binding to hemoproteins and heme complexes.

Isocyanide binding to hemoproteins and heme complexes

Deep anterior lamellar keratoplasty in keratoconus

Aims: To analyse the outcome of DALK in patients with keratoconus in terms of best corrected and uncorrected visual acuity, average K and topographic astigmatism. Settings and design: Prospective interventional case series study Material and methods: 28 eyes of 28 patients diagnosed with keratoconus were evaluated from August 2009 – July 2011 in a tertiary eye care hospital. All patients underwent DALK and outcomes were assessed on 4 parameters: Average Keratometric reading, topographic astigmatism, UCVA and BCVA alongwith epidemiological analysis. Statistical analysis used: ANOVA testing and Dunnett multiple comparison test. Results: We had evaluated 28 eyes of 28patients (10 males and 18 females) in the age group of 15 to 35 years. Cases were classified as moderate (4) and severe (24) category. There was a statistical significant decrease Average K and Topographic Astigmatism in post op period which was evaluated at 1, 3 and 6 months. (p value <0.05). From the sample size, allof the patients showed improvement in visual acuity by more than one Snellens. No significant post operative complications occurred. Conclusion: DALK is a safe and effective treatment for severe keratoconus, corneal scarring and contact lens intolerance

Optimization of gas lift system for well performance improvement in Asmari formation: A techno-economic perspective

Well productivity in the Asmari carbonate formation of southwest Iran has decreased in recent years as a result of production issues. The production rate must be maintained below 1500 STB/day to prevent water coning. In this study, a gas lift well is modeled using data from one of the producing wells of this field. Nodal analysis is performed using lift-gas injection rates and wellhead pressures at different reservoir pressures and water cut conditions to optimize production. Economic aspects are considered to optimize the artificial gas injection rates at different tubing head pressures and water cut conditions. Increasing the lift-gas injection rate from 0.4 MMscf/day to 1 MMscf/day enhances the oil production rate by 37.71% and 43.89% for 10% and 30% water cut conditions, respectively. Gas injection rates of 5.2 MMscf/day and 5.4 MMscf/day are determined to be economically optimal for 30% water cut with tubing head pressures of 260 psig and 270 psig, respectively

Preoperatively Confirmed Idiopathic Myointimal Hyperplasia of the Mesenteric Veins: A Case Report

Idiopathic myointimal hyperplasia of the mesenteric veins (IMHMV) is a rare cause of colonic ischemia. First documented in the literature in 1991, this condition has remained exceedingly rare, with only a limited number of case reports since its initial mention. It involves proliferation of intimal smooth muscle within the mesenteric veins, resulting in colonic ischemia due to venous constriction and non-thrombotic occlusion. Patients experience a prolonged clinical course and adverse outcomes due to its rarity and nonspecific symptoms. The definitive diagnosis is typically confirmed after surgical resection of the affected colon, as initial biopsies are not deep enough to confirm the diagnosis. Histological examination of these biopsies reveals arteriolization of capillaries, subendothelial hyaline deposits, and fibrin thrombi. We present a case of a patient with a one-year history of diarrhea and abdominal pain. Biopsy samples obtained during colonoscopy showed colitis and proliferation of muscularized capillaries, consistent with IMHMV, prior to colon resection. The patient ultimately underwent laparoscopic total abdominal colectomy to the distal one-third of the rectum with end ileostomy. IMHMV is commonly treated surgically and mismanagement of this condition involving corticosteroids and immunomodulatory agents may result in unfavorable outcomes. This case report is one of the few cases of IMHMV diagnosed preoperatively within existing literature, which highlights a rare etiology of nonspecific colitis, emphasizing the critical divergence in its management approach

Assessing plasma-etched InP laser facet quality

This work presents an approach to assess the quality of etched laser facets, considering factors such as roughness, inclination, and non-uniform light emission. Broad area InP lasers, using plasma etched facets, operating at 1550 nm are manufactured with varying facet quality on five 100 mm wafers. Comparison of the threshold current density of lasers of different length was used to derive relative facet reflectivity and demonstrated the relationship between the reflectivity and the optical mode weighted facet roughness and facet inclination