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ABSTRACT: A new adsorption gel has been developed by immobilizing N-aminoguanidine (AG), a chelating ligand, on persimmon tannin extract through consecutive reactions. Adsorption behavior of the gel was investigated for the adsorptive separation and recovery of precious metal ions from varying concentration of HCl medium. The adsorption isotherms of precious metal ions on the gel were described by the typical monolayer type of Langmuir model and the maximum adsorption capacities were evaluated as 8.90molkg(-1) for Au(III), 2.01molkg(-1) for Pd(II) and 1.01molkg(-1) for Pt(IV). Real time applicability of the gel was examined for the recovery of precious metals from actual leach liquor of e-waste leached with chlorine containing hydrochloric acid. The gel was found to be highly efficient and selective for the uptake of targeted metal ions in the presence of excess base metal ions and also exhibited superior selectivity over commercially available anion exchange resins.
Bioresource technology 11/2012; 129C:108-117. · 4.25 Impact Factor
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ABSTRACT: The outcome of brain trauma is determined by the initial injury and the development of secondary problems, such as hematomas, edema, herniation, infections, cerebrospinal fluid leaks, and seizures. The DICH can cause rapid clinical deterioration of the patient and can even lead to fatal outcome. The problem is unusual but not rare. Although first reported in 1895 by Guibert, traumatic intracranial aneurysms (TICA) have received little attention in the literature. Missile TICA's are often seen on a secondary branch of middle cerebral artery and are usually accompanied by a intracerebral hematoma (80%) or by an acute subdural hematoma (26%). TICAs may enlarge in time, and seemingly inoffensive, may rupture and may lead to death. Depending on the patient's status and level of consciousness, angiography followed by the trapping of aneurysm is the treatment of choice. Our case has developed delayed posttraumatic intracerebral hematoma associated with pulmonary edema and subsequent death of the patient.
Neurosurgery Quarterly 10/2011; 21(4):252–254. · 0.10 Impact Factor
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ABSTRACT: Adsorption gels for fluoride ion were prepared from orange waste by saponification followed by metal loading. The pectin compounds contained in orange waste creates ligand exchange sites once it is loaded with multi-valent metal ions such as Al(3+), La(3+), Ce(3+), Ti(4+), Sn(4+), and V(4+) to be used for fluoride removal from aqueous solution. The optimum pH for fluoride removal depends on the type of loaded metal ions. The isotherm experiments showed the Langmuir type monolayer adsorption. Among all kinds of metal loaded gels tested, Al loaded gel appeared to exhibit the most favorable adsorption behavior. The adsorption kinetics of fluoride on loaded gel demonstrated fast adsorption process. The presence of NO(3)(-), Cl(-) and Na(+) ions has negligible effect on fluoride removal whereas SO(4)(2-) and HCO(3)(-) retarded the fluoride removal capacity in some extent. Fluoride removal at different adsorbent doses showed that fluoride concentration can be successfully lowered down to the acceptable level of environmental standard. The fluoride adsorption mechanism was interpreted in terms of ligand exchange mechanism. The complete elution of adsorbed fluoride from the gel was successfully achieved using NaOH solution.
Journal of hazardous materials 05/2011; 192(2):676-82. · 4.14 Impact Factor
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ABSTRACT: The use of force to control public uprisings, riots, unruly mobs is an important tool in any administrative setup. Law enforcement agencies often resort to aerial firing, which can be responsible for unintended injuries due to stray bullets.This study was designed to study the pattern of stray bullet injuries and to generate awareness about the hazards related to the use of live ammunition during riot control.
This study was conducted in our unit of the neurosurgery department over a period of 18 months, from June 2008 to December 2010. We enrolled all patients who had head or spine injuries caused by stray bullets from firing during riot control far away from the site of injury.
We had two patients with head injury and two with spinal injury sustained because of stray bullets. One of the patients with head injury was operated and the other one was managed conservatively; the latter died on the third day of injury, while the former is surviving with some residual neurological deficit. Amongst the patients with spinal injury, neurological deficits persist till date. None of the patients were aware that they had sustained a bullet injury, and it was only after inquiry that we came to know that the police had resorted to aerial firing for controlling public agitation in nearby areas.
Aerial firing of live cartridges is generally considered an 'innocuous' method; however, in view of the potential for injury to innocent bystanders, we recommend that the use of live cartridges during aerial firing be banned.
Surgical neurology international. 01/2011; 2:122.
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ABSTRACT: Objective: A case of isolated recurrence of intracranial granulocytic sarcoma (GS), also known as chloroma, is reported. Intracranial involvement of the central nervous system by GS is rare. This is a rare report in which the tumor had involved meninges with extension to both the middle cranial fossa and cerebellopontine cistern in the remission phase of the disease.
Clinical Presentation: The patient was a treated case of marrow-positive acute myeloid leukemia and was disease-free for 4 years. The patient developed severe headache and other features of raised intracranial pressure. He was investigated and it was found on computed tomography scan and magnetic resonance imaging that the patient was harboring a huge tumor that extended across the petrous temporal bone and involving both the middle and posterior cranial fossae.
Surgical Management: The patient underwent temporal craniotomy with complete excision of the tumor in the middle cranial fossa, and through a transtentorial approach a part of the tumor extending into the posterior cranial fossa was removed. The patient received postoperative radiotherapy.
Conclusions: Isolated recurrence of intracranial GS is a rare entity. It should be considered in any patient treated for leukemia who presents with features of raised intracranial pressure or has other neurologic signs.
Neurosurgery Quarterly 05/2010; 20(2):90-94. · 0.10 Impact Factor
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ABSTRACT: This investigation provides new insights into the effective removal of tetrafluoroborate (BF4-) by means of bio-sorption on waste generated in the orange juice industry. It was undertaken to evaluate the feasibility of zirconium (IV)-loaded saponified orange waste gel for BF4- removal from an aqueous solution. Batch adsorption experiments were carried out to study the influence of various factors such as pH, presence of competing anions, contact time, initial BF4- concentration and temperature on the adsorption of BF4-. The optimum BF4- removal was observed in the equilibrium pH region 2-3. The presence of coexisting anions showed no adverse effect on BF4- removal except SO4(2-). The equilibrium data at different temperatures were reasonably interpreted by the Langmuir adsorption isotherm and the maximum adsorption capacities were evaluated as 2.65, 3.28, 3.87 and 4.77 mmol g(-1) at 293, 298, 303 and 313 K, respectively. Thermodynamic parameters such as deltaGo, deltaHo and deltaSo indicated that the nature of BF4- adsorption is spontaneous and endothermic. The results obtained from this study demonstrate the potential usability of orange waste after juicing as a good BF4- selective adsorbent.
Environmental Technology 33(7-9):845-50. · 1.41 Impact Factor
