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Search Results: 1 - 10 of 48 matches for " Rumana Jafarey "
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Study on the Estrous Cycle Regularity of Cryopreserved Rat Ovarian Tissues after Heterotopic Transplantation  [PDF]
Rumana Jafarey, Syed Ali Rehan Shah Jaffri
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.65037
Abstract: Objective: To evaluate the re-initiation of ovarian function in cryopreserved ovarian grafts by means of vaginal smear of transplant rats. Methods: A total of 40 SPF-SD female rats (5 - 6 week-old) were randomly divided into three groups (blank control, castration control and transplant group). Ovaries were removed by surgical procedure then after cryopreservation and thawing procedures the ovarian tissues pushed inside the back muscles gap in transplant group. On the first PO day, vaginal smear collection was daily initiated. After 30 days, the PO day when the estrous cycle was re-initiated was considered for analysis as well as the estrous days and the number of estrous cycles. Results: Normal control group had a regular estrous cycle, while the transplant group had an estrous cycle disorder within first 2 weeks and later 2 weeks after the transplantation while the duration of diestrus cycle lasted longer. At the same time, the castration group had lost the normal estrous cycle, keeping continue in the stage of diestrus. Conclusion: In transplanted animals the re-initiated ovarian function can be predicted with alteration between estrous and diestrus phases with predominant estrous irregularity. Moreover, short autotransplanted graft duration needs time to perfuse by new blood vessels and hormone secretions, so could not directly affect its target organs to function properly.
Evaluation of Phytoremediation Potential of Catharanthus roseus with Respect to Chromium Contamination  [PDF]
Rumana Ahmad, Neelam Misra
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.515251
Abstract:

A major environmental concern due to dispersal of industrial and urban wastes generated by human activities is the contamination of soil. The release of heavy metals into the terrestrial ecosystem is a major problem. Accumulation of heavy metals in environment and particularly in soil is a serious environmental concern, as the accumulated heavy metal ions can find their way into living organisms via contamination of ground water or food chain. This praxis urgently requires and demands governmental regulations in India. Two samples of sludge were collected from Banthar Industrial Pollution Control Company (BIPCC), UP State Industrial Development Corporation (UPSIDC), Leather Technology Park, Banthar, Unnao, India. In the present study, the phytoremediation potential of Catharanthus roseus, a valued medicinal plant, with respect to chromium has been analyzed. C. roseus was shown to absorb up to about 38% of the amount of Cr present in primary and secondary sludge amended soil through roots and accumulate it to about 22% in leaves. Effect of chromium concentration on the status of antioxidant enzyme peroxidase (POD) and detoxification enzyme glutathione-S-transferase (GST) from C. roseus leaves was also observed and determined. Increased expressions of POD and GST were observed on native PAGE under stress conditions as compared to control. C. roseus can well tolerate low amounts of chromium (and accumulate it to about 22% in leaves) and can, thus, prove useful in the reclamation and remediation of chromium contaminated soil and land.

Criticality in a model of banking crises
Giulia Iori,Saqib Jafarey
Quantitative Finance , 2001, DOI: 10.1016/S0378-4371(01)00297-7
Abstract: An interbank market lets participants pool the risk arising from the combination of illiquid investments and random withdrawals by depositors. But it also creates the potential for one bank's failure to trigger off avalanches of further failures. We simulate a model of interbank lending to study the interplay of these two effects. We show that when banks are similar in size and exposure to risk, avalanche effects are small so that widening the interbank market leads to more stability. But as heterogeneity increases, avalanche effects become more important. By varying the heterogeneity and connectivity across banks, the system enters a critical regime with a power law distribution of avalanche sizes.
Multiobjective Duality in Variational Problems with Higher Order Derivatives  [PDF]
Iqbal. Husain, Rumana. G. Mattoo
Communications and Network (CN) , 2010, DOI: 10.4236/cn.2010.22021
Abstract: A multiobjective variational problem involving higher order derivatives is considered and optimality condi-tions for this problem are derived. A Mond-Weir type dual to this problem is constructed and various duality results are validated under generalized invexity. Some special cases are mentioned and it is also pointed out that our results can be considered as a dynamic generalization of the already existing results in nonlinear programming.
A Combined Forward Osmosis and Membrane Distillation System for Sidestream Treatment  [PDF]
Taqsim Husnain, Baoxia Mi, Rumana Riffat
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.714091
Abstract: Separate treatment of high-nutrient sidestream is an efficient and cost effective way to decrease the loading on the main plant, resulting in lower effluent nutrient concentration. This study investigated the use of a combined forward osmosis-membrane distillation (FO-MD) system for the removal of nitrogen present in high concentration in sidestream from anaerobic digestion process. The combined system was able to achieve almost 100% rejection of solids and acetic acid, and more than 98% rejection of NH3-N from the sidestream. The high rejection of NH3-N was mainly achieved by the FO process. The solids in the feed solution contributed to fouling problem in both FO and MD, resulting in significant decline in flux. However, 76% or higher flux recovery was achieved for FO membrane by cleaning with tap water. We observed that flux recovery was due to removal of solids from the membrane surface by the cleaning process. FO membrane also demonstrated excellent performance for continuous operation when cleaned for 15 min in every 24 h interval. Overall, the combined FO-MD system was found to be an effective solution for treatment of nutrient rich sidestream.
Ameliorative Effect of Chelating Agents on Photosynthetic Attributes of Cd Stressed Sunflower  [PDF]
Rumana Sadiq, Nazimah Maqbool, Muhammad Haseeb
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2016.82010
Abstract: Excessive input of heavy metals in water reservoir and cultivated land primarily affects the growth and yield of crops. The aim of this work was to study the mechanism of Cd toxicity and damage to photosynthetic pigments and their efficiency and the potential of natural (OA) and synthetic chelators (EDTA) in assisting the phytoextractor sunflower plant. The pot experiment was laid out in a complete randomized way for Cd, chelators and hybrids at seedling, vegetative and reproductive stages with three replications. Cd affects the gas exchange parameters directly or indirectly by affecting the light and dark reactions, while indirect effect includes inhibition of chlorophyll and carotenoids biosynthesis and degradation and alteration in Chl a/b ratio. Among two chelators, natural chelator OA found to be very supportive in ameliorating the Cd tocixity by phytoextractor in assistance to sunflower hybrid Hysun-33.
A REVIEW AND EVALUATION OF THE ENVIRONMENTAL IMPACT ASSESSMENT PROCESS IN PAKISTAN
RUMANA RIFFAT,DAULAT KHAN
Journal of Applied Sciences in Environmental Sanitation , 2006,
Abstract: Most developing countries, such as Pakistan, now officially regard environmental concern as part of their overall framework for economic and social planning. Pakistan has established national environmental policies and programs, including legislation, to protect the environment. This paper describes the evaluation of the Environmental Impact Assessment (EIA) process in Pakistan using the Christopher Wood model. The Pakistan EIA process has several strong characteristics. These include legal provision of EIA, opportunity for public participation, reasonable alternative options, strong emphasis on environmental monitoring once proposals are implemented, and availability of screening, scoping, report preparation and review options. The shortcomings of the Pakistan EIA system were the implementation of EIA process, lack of importance of EIA at the time of decision making, and absence of a strategic environmental assessment process. The evaluation of the Pakistan EIA process with the Wood model showed that it was a fairly good process at present political and socioeconomic situation of the country. For future improvements, especially regarding implementation of EIA, there is a need for environmental education, environmental capacity building, and proper training in the environmental field.
Activation Energy of Aggregation-Disaggregation Self-Oscillation of Polymer Chain
Yusuke Hara,Rumana A. Jahan
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131216281
Abstract: In this paper, we investigated the activation energies of the aggregation–disaggregation self-oscillation induced by the Belousov-Zhabotinsky (BZ) reaction by utilizing the nonthermoresponsive polymer chain in a wide temperature range. This is because the conventional type self-oscillating polymer chain, with thermoresponsive poly(Nisopropylacrylamide) (poly(NIPAAm) main-chain covalently bonded to the ruthenium catalyst (Ru(bpy) 3) of the BZ reaction, cannot evaluate the activation energy over the lower critical solution temperature (LCST). The nonthermoresponsive self-oscillating polymer chain is composed of a poly-vinylpyrrolidone (PVP) main-chain with the ruthenium catalyst (Ru(bpy) 3). As a result, we clarified that the activation energy of the aggregation–disaggregation self-oscillation of the polymer chain is hardly affected by the concentrations of the BZ substrates. In addition, the activation energy of the nonthermoresponsive self-oscillating polymer chain was found to be almost the same value as normal BZ reaction, i.e., not including the self-oscillating polymer system with Ru moiety.
Influence of Initial Substrate Concentration of the Belouzov-Zhabotinsky Reaction on Transmittance Self-Oscillation for a Nonthermoresponsive Polymer Chain
Yusuke Hara,Rumana A. Jahan
Polymers , 2011, DOI: 10.3390/polym3010330
Abstract: We succeeded in causing transmittance self-oscillations of a novel self-oscillating polymer chain induced by the Belouzov-Zhabotinsky (BZ) reaction under constant conditions. The novel polymer chain was composed of a biocompatible and non-thermoresponsive poly-vinylpyrrolidone (PVP) main-chain, covalently-bonded to the ruthenium catalyst (Ru(bpy) 3) of the BZ reaction. We investigated the influence of initial substrate concentrations of the three BZ substrates on the transmittance self-oscillation of the novel polymer solution. As a result, we demonstrated that the width of the transmittance self-oscillation is significantly affected by these initial concentrations. However, the amplitude of the transmittance self-oscillation is hardly affected by the BZ substrate conditions. Furthermore, the period of the self?oscillation has a good linear relationship to the concentration of the BZ substrates. Therefore, the period of the self-oscillation can be controlled by the selection of the initial concentrations of the BZ substrates.
Kawasaki Disease presenting with intussusception: a case report
Rumana N Hussain, Gary Ruiz
Italian Journal of Pediatrics , 2010, DOI: 10.1186/1824-7288-36-7
Abstract: A 3 yr old Caucasian boy was referred from the accident and emergency department to the paediatric surgical team with a history of acute onset abdominal pain. The pain was central, and associated with fever, non bilious vomiting and the passage of red, jelly-like stools. There was no history of weight loss, jaundice or foreign travel; there was no contact history and no recent change in dietary habits. Other than a mild upper respiratory tract infection, the child was previously fit and well with no relevant medical history. On examination, the child was well nourished; he was miserable and lethargic with fever (38.1°C) and tachycardia (heart rate 120/min). He was warm and well perfused with a capillary refill time of <2 seconds both centrally and peripherally. His abdomen was tender, distended and resonant; bowel sounds were hyperactive and a small, tender, rubbery mass was palpable centrally. An ultrasound scan was undertaken and confirmed the presence of an intussusception. The child underwent a contrast enema; control films showed a filling defect in the ascending colon at the location of the colo-colic intussusception. During a subsequent air enema, air insufflation to a pressure of 120 mmHg was sufficient to reduce the intussusception adequately. The child was kept in hospital overnight for observation.By the following day, the boy's condition had improved with resolution of his abdominal pain; he was able to eat and drink and interact with his parents and staff. However he continued to have a remittent fever to 38.5°C and he remained lethargic and miserable. Subsequently, he developed a diffuse morbilliform rash over the trunk and limbs and cervical lymphadenopathy was noted with an associated congested throat and enlarged tonsils, which was thought to be viral in origin. Blood tests revealed a C-reactive protein 61 mg/L, normal blood count, serum electrolytes, liver function tests and chest X-ray; Ebstein Barr viral serology, blood cultures and urine culture
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