Eco-friendly alternative refrigeration systems     

S. S. Verma 《Resonance》2001,6(10):57-67

Refrigeration applications at the domestic, commercial and industrial levels are becoming an integral part of the present day living. The demand and supply of refrigeration systems is increasing day by day with the changing lifestyle. The existing compressor-based refrigeration (i.e., mechanical refrigeration) system has reached the maximum level of innovation. For the last few decades, there has not been any significant increase in the efficiency (i.e., coefficient of performance, COP) of the system. Moreover, with the increasing awareness of environmental degradation, the production, use and disposal of ChloroFluoro Carbons (CFCs) and HydroChloroFluoroCarbons (HCFCs) as refrigerants in mechanical refrigeration system has become a subject of great concern. However, such systems are being developed using more ecofriendly refrigerants viz., air, CO₂, NH₃, etc. Besides, efforts are being directed to develop other types of refrigeration technologies e.g., magnetic refrigeration, thermoelectric refrigeration (discussed in Part 1) and thermoacoustic refrigeration (discussed in Part 2), which will be moreecofriendly, cost effective, efficient, simple in design, convenient and reliable.  相似文献   

Commentary on Cross‐Cultural Perspectives on Positive Youth Development With Implications for Intervention Research          下载免费PDF全文

Silvia H. Koller  Suman Verma 《Child development》2017,88(4):1178-1182

There is a growing focus on youth positive development issues among researchers and practitioners around the world. In this special issue of Child Development, each of the international authors provides new perspectives and understanding about youth developmental assets in different cultural settings. The present commentary (a) examines some of the cross‐cultural themes that emerge from the four articles by international authors in this issue with implications for positive youth development (PYD) and (b) how intervention science can benefit by incorporating a PYD approach. As evident, youth involved in contexts that provide positive resources from significant others not only were less likely to exhibit negative outcomes, but also were more likely to show evidence of positive development.  相似文献   

Correction to: Combined Analysis of Anti SARS-CoV-2 IgG and IgM Responses in COVID19 Patients in India     

Mohana Kumari Chidananda  Deepy Zohmangaihi  Sant Ram  Shiv Lal Vikas SoniSuri  Pankaj Malhotra  Ravjit Singh Jassal  Jyotdeep Kaur  Indu Verma  Sadhna Sharma 《Indian journal of clinical biochemistry : IJCB》2021,36(4):501

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Examining the mediation of power in a collaborative community: engaging in informal science as authentic practice     

Anton Puvirajah  Geeta Verma  Horace Webb 《Cultural Studies of Science Education》2012,7(2):375-408

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Development,Norms and Factorial Validity of Scales for Measuring Racial Attitudes in Adolescents in Multi‐Ethnic Settings     

Christopher Bagley  Gajendra K. Verma 《Educational studies》1978,4(3):189-200

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Effect of water extract of <Emphasis Type="Italic">Trichosanthes dioica</Emphasis> fruits in streptozotocin induced diabetic rats     

Prashant Kumar Rai  Dolly Jaiswal  Devendra K. Rai  Bechan Sharma  Geeta Watal 《Indian journal of clinical biochemistry : IJCB》2008,23(4):387-390

In rats with streptozotocin induced severe diabetes mellitus, aqueous extract of Trichosanthes dioica fruits at a dose of 1000mg/kg body weight daily once for 28 days reduced the levels of fasting blood glucose, postprandial glucose, asparate amino transferase, alanine amino transferase, alkaline phosphatase, creatinine, urine sugar and urine protein where as total protein and body weight was increased. No toxic effect was observed during LD50. Our study suggests that further detailed toxicity studies and mechanism of action of T. dioica would be useful for undertaking human trials.  相似文献   

Vocational Expectations and Aspirations of the Last of the Early Leavers     

Gajendra K. Verma 《Cambridge Journal of Education》1974,4(3):134-145

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Tyrosinase activity in photosensitive individuals inin-vitro study     

J. R. Pradeep  R. Roopa  P. Geeta  V. F. Julius  T. Venkatesh 《Indian journal of clinical biochemistry : IJCB》1996,11(2):158-161

A reddish glow localized within the iris was observed in the photographs of some individuals in the dark using an electric-arc flash. On repeated exposure and reprints of the same individuals to photography under similar conditions, the red glow persisted. Studies were under taken to analyze thein vitro effect of cupric ions on the activity of serum tyrosinase. A significant increase in the activity of tyrosinase was observed in the affected individuals as compared to the controls when cupric ion was supplementedin vitro. Studies also confirmed the inhibitory effect of benzoic acid on serum tyrosinase activityin vitro. Our preliminary studies have shown a significant decrease (p<0.001) in tyrosinase activity in the serum of the photosensitive individuals compared to controls which is consistent with the observed red glow on the photographic prints and reprints.  相似文献   

Diagnostic Value of Lactate Levels in Acute Abdomen Disorders     

Indu Verma  Satinder Kaur  Subash Goyal  Shweta Goyal  J. S. Multani  A. P. S. Narang 《Indian journal of clinical biochemistry : IJCB》2014,29(3):382-385

The supply of oxygen is limited in certain intra abdominal conditions due to direct vascular invasion or inflammatory process, resulting in high lactate levels. Aim of this study was to find the predictive value of lactate levels in the peritoneal fluid (PF) and blood of patients with acute abdomen. The study comprised of fifty patients with acute abdominal conditions, admitted in emergency ward of tertiary care hospital, thirty patients were with surgical abdomen (group I) and twenty patients with non surgical abdomen (group II). Lactate was estimated in PF and blood on Blood Gas Analyzer (NOVA, M-7). The mean lactate levels in PF were significantly higher in group I as compared to group II (14.65 ± 1.195 vs. 5.92 ± 0.97 mmol/L, p < 0.001). There was no significant difference in blood lactate levels in both the groups. When PF and blood lactate levels were compared within groups, we found that PF levels were significantly higher than blood in group I (14.65 ± 1.195 vs. 3.85 ± 0.54 mmol/L, p < 0.001) but not in group II (5.92 ± 0.97 vs. 4.36 ± 0.95 mmol/L). Diagnostic value was obtained using ROC curve. Cut off values obtained for PF lactate, difference and ratio of PF and blood lactate (≥6.4 mmol/L, ≥3.3 and ≥2.1 respectively) are at very high degree of sensitivity and specificity. So it can be useful marker of surgical emergency in patients with acute intra abdominal pathology, especially in clinically ill patients or in whom physical examination is not yielding because of neurologic disorders or unresponsiveness.  相似文献   

Antinuclear Antibody Profiling in Patients of a Tertiary Care Centre in Central India     

Prishni Gupta  Pratishtha Agrawal  Neha Rani Verma  Seema Shah  Suprava Patel  Rachita Nanda  Eli Mohapatra 《Indian journal of clinical biochemistry : IJCB》2021,36(3):345

The incidence of autoimmune disorders that includes the connective tissue diseases has seen a rise in India in recent times. Antinuclear antibodies, the telltale sign of systemic autoimmune response, thus can be used as a screening tool and also to support the diagnosis of systemic autoimmune disease. The present retrospective cross- sectional analysis aimed to study the antinuclear antibodies profile (patterns and specific antibody reactivity) amongst suspected cases of auto-immune disorders at a tertiary care teaching hospital. The study retrieved and reviewed reports of 644 patients sent for ANA testing by indirect immunofluorescence assay over a period of 1 year by different specialty departments. Positive samples were further processed for anti-ds-DNA antibody and antibodies to extractable nuclear antigen. Data collected was statistically analysed. ANA pattern positivity was observed in 31% of cases and a positive antibody reactivity was seen in 66% of them. Female predominance (82%) was noted in both pattern positivity and antibody reactivity. High levels of pattern positivity and antibody reactivity was found in the young adults (45.9%). Amongst the ANA patterns, the nuclear homogenous pattern was found the commonest. The common antibodies associated with this pattern were anti-dsDNA and U1 Sm/RNP antibodies. A stronger fluorescence intensity on initial screening showed a higher confirmation rate for specific antibodies on immunoassay. High occurrence of positive ANA patterns in autoimmune disorders suggests its utilization as a screening tool for them and would also play an adjuvant to the diagnosis. Early knowledge about future autoimmunity will earn better prognostic achievements through better treatment interventions.  相似文献