Transactions of Nonferrous Metals Society of China, 2009
Biosorption of Cr(VI) on sulfuric and phosphoric acid-treated Datura stramonium fruit was investi... more Biosorption of Cr(VI) on sulfuric and phosphoric acid-treated Datura stramonium fruit was investigated in batch mode. The various parameters that influence the biosorption process such as Cr(VI) initial concentration, biosorbent dosage, contact time, temperature, and pH value were optimized. Both linear and non-linear regression analysis of isotherm data suggest that Langmuir isotherm model mimics the behavior of Cr(VI) ion biosorption onto Datura stramonium fruit biosorbent. The maximum Cr(VI) ions adsorption capacity of 138.074 mg/g at pH 2 is achieved with phosphoric acid treated Datura stramonium (PDSF). The kinetics of adsorption process is well described by pseudo-second-order model with high R 2 and low χ 2 value. The estimated activation energy of < 8 kJ/mol obtained for both raw and chemically modified adsorbents suggests that the adsorption occurs mainly via physisorption. Besides, thermodynamic results reveal that biosorption of Cr(VI) on both treated and untreated Datura stramonium was endothermic, spontaneous, and randomness in nature.
Coalbed methane is formed by geological or biological process in coal seams, which offers signifi... more Coalbed methane is formed by geological or biological process in coal seams, which offers significant environmental benefits over other fossil fuel. Ecosystem/biological study is more susceptible to exploration for CBM/Natural gases reservoir but there are few studies that have been conducted on the environmental impacts of this type of resource extraction. The present paper discussed about the prospect of CBM reservoir on the basis of ecological marks. In this regardstwo distinguish field chosen are CBM producing area and non-mining/CBM area. Samples of Soil, Water and Coalhave been collected for analysis and resulted parameters correlated with each other tounderstood coalification area and probability of existing CBM reservoir on the basis of ecological substances
Environmental Science and Pollution Research, 2021
Women spend relatively more time in indoor environments in developing countries. Exposure to vari... more Women spend relatively more time in indoor environments in developing countries. Exposure to various indoor air pollutants leads them to higher health risks according to household air quality in which they reside. Particulate matter (PM) exposure with their exposure duration inside the household plays a significant role in women’s respiratory problems. This study measured size-segregated particulate matter concentrations in 63 residences at different locations. Respiratory dust depositions (RDDs) for 118 women in their different respiratory regions like head airway (HD), tracheobronchial (TB), and alveolar (AL) regions for the three PM size fractions (PM10, PM2.5, and PM1) were investigated. For different positions like light exercise and the sitting condition, RDDs values found for AL region were 0.091 μgmin−1 (SD: 0.067, 0.012–0.408) and 0.028 μgmin−1 (SD: 0.021, 0.003–0.126) for PM10, 0.325 μgmin−1 (SD: 0.254, 0.053–1.521) and 0.183 μgmin−1 (SD: 0.143, 0.031–0.857) for PM2.5, 0.257 μgmin−1 (SD: 0.197, 0.043–1.04) and 0.057 μgmin−1 (SD: 0.044, 0.009–0.233) respectively for PM1 to females. RDDs values in the AL region significantly increase as PM10 (11%), PM2.5 (68%), and PM1 (21%), confirming that for women, the AL region is the most prominent affected zone by fine particles (PM2.5).
This paper presents a comprehensive review of commercially important exudate gum from the karaya ... more This paper presents a comprehensive review of commercially important exudate gum from the karaya tree (Sterculia species). This gum is naturally available, non-hazardous, cost effective and renewable with unique properties, which make it an ideal choice over other natural or synthetic counterparts for a variety of applications in food, pharmaceutical and alike industries. Owing to a huge demand and high value of this commercially important gum, the karaya trees are being over exploited. To curb the threat to karaya trees in natural habitat, some states in India have banned the commercial production and marketing of this gum. Hence, it is required to establish a balance between gum production and species conservation, which can be done through adopting the scientific tapping methods. This review covers practices followed and past as well as recent research works carried out in production, processing, value addition and application development of this gum. It also presents compiled information on the size and importance of this gum in the world market. This review is likely to help research workers, enthusiasts and end users of natural gums.
Asian Journal of Pharmaceutical and Clinical Research, 2021
Objective: The objective of the study was to monitor the adverse drug reactions (A.D.Rs.) associa... more Objective: The objective of the study was to monitor the adverse drug reactions (A.D.Rs.) associated with antihypertensive drugs. Methods: All patients coming to the department with blood pressure systolic above 120 mmHg and diastolic above 90 mmHg and prescribed hypertensives will be screened for the study. Results and Discussion: A total of 136 patients were observed during the study. Out of 136 patients, 23 (17%) A.D.Rs. were recorded. A study conducted by Ramesh et al. in the Indian capital reports that 22.3% of the patients experienced A.D.Rs. Conclusion: Furthermore, any appearance of A.D.Rs. due to side effects of the drugs or due to bad control and patients non-compliance, it was treated mainly by decreasing the doses of the drugs, switching them to another active substance from the same pharmacological group, or by adding more active substances from different pharmacological groups in lower dosages to achieve the B.P goals.
National Journal of Physiology, Pharmacy and Pharmacology, 2021
Background: Lipoprotein (a) (Lp[a]) is a thrombogenic and atherogenic molecule. Several studies h... more Background: Lipoprotein (a) (Lp[a]) is a thrombogenic and atherogenic molecule. Several studies have shown Lp(a) as an independent risk factor for stroke. The casecontrol study was done in West Godavari district of Andhra Pradesh. Aims and Objectives: To estimate the levels of serum lipoprotein (a) in patients with acute ischemic stroke and the association. Materials and Methods: Lp(a) was quantified by immunoturbidimetric method and lipid profile by enzymatic method. Results: The serum Lp(a) levels were significantly elevated (P < 0.001) in cases (62.5 ± 18.3 mg/dl) as compared to controls (21.7 ± 7.1 mg/dl). Conclusion: Elevated Lp(a) is a risk factor for stroke and might play an important role in the genesis of cerebrovascular thrombosis. It may be appropriate to assess Lp(a) levels in Indians along with routine lipid profile testing in subjects with other risk factors.
In this paper we presented how a physical system can be represented as a mathematical model. We u... more In this paper we presented how a physical system can be represented as a mathematical model. We used MATLAB’s symbolic mathematics tool to solve the system dynamic equations. These systems are highly non-linear, so we linearized the system at unstable fixed points using Taylor series expansion and optimal control algorithms such as Linear Quadratic Regulator(LQR) to balance the system at the desired position. Results discussed.
Nasopharyngeal Carcinoma (NPC) frequently occurs in the epithelial lining of the nasopharynx. It ... more Nasopharyngeal Carcinoma (NPC) frequently occurs in the epithelial lining of the nasopharynx. It is a common cancer occurring in Southern China and South East Asia, while this disease is comparatively rare in most other parts of the world. Development of the disease is closely related to genetic, viral, environmental and dietary factors. Among these, Epstein Barr Virus infection is consistently associated with NPC. Cancer stem cells (CSC), a subset of cancer cells within a tumor having the ability to self renew and differentiate, are recently reported to be closely related with recurrence of tumours. In comparison, using the ability of exclusion of the DNA dye Hoechst 33342 as the parameter, side population (SP) cells can be isolated form the heterogeneous cell populations in tumour mass. SP cells may share characteristics of CSCs, both being enriched for tumor initiating capacity, and resistance to chemotherapy and radiotherapy. Although SP cells and CSCs were recently reported in ...
Most of the worldly problems and suffering are result of our loss of faith in basic humanity that... more Most of the worldly problems and suffering are result of our loss of faith in basic humanity that bind us together as human family. In this point of time when we have given priority to material benefits above humanity, where we are lost in matrix created by us, we need a guide. Buddhism, as a path shows man how to live in harmony and peace with his fellow beings. If we are aware of the fundamentals, we will find a way from the vast body of experiences that comes to us as Buddhism, which is relevant in our life and type of problems we are facing in today’s world.
Introduction: Etiology of Pancreatitis continues to stir up controversy. The incidence of acute p... more Introduction: Etiology of Pancreatitis continues to stir up controversy. The incidence of acute pancreatitis has been reported to vary around the world in different studies. The etiological profile of pancreatitis may be different in different parts of the world and it is therefore important that experiences from different parts of the country be recorded. Alcohol was once thought to be most common etiology. Recent studies in western countries show that non-alcoholic causes include more than 50% of causes of pancreatitis. Aim: The aim this study was to know the etiological factors of pancreatitis and to compare the serum amylase, lipase levels in alcoholic and nonalcoholic patients. Materials and methods: This was a prospective observational study conducted in Gandhi Medical College and Hospital, Secunderabad from December 2012 to November 2014 with duration of 2 years. 75 patients were included in this study according to inclusion and exclusion criteria. Detailed history along with...
The combined mean normal lapse rates for 0000 and 1200 UTC for 35 Radiosonde (RS) stations based ... more The combined mean normal lapse rates for 0000 and 1200 UTC for 35 Radiosonde (RS) stations based on the period 1971-99 during the summer months (March to May) were worked out for standard levels and analysed. To know whether any relationship exists between the distribution of summer lapse rates and the all India summer monsoon rainfall (June to September), the mean lapse rates for three good monsoon years and six deficient years during the same period were worked out separately and the Lapse Rate Anomalies (LRAs) were examined in detail. In excessive monsoon rainfall years the LRAs were generally negative (instable atmosphere) during summer months (March-May) in the lower and middle troposphere and the anomalies were positive in the upper troposphere. In the deficient monsoon years, the case is reverse i.e., LRAs were positive in the lower troposphere (inhibiting the convective activity) while they were negative in the middle and upper troposphere. The same results were noticed...
Language as a medium could be pleasant or unpleasant under various circumstances. Dalit women und... more Language as a medium could be pleasant or unpleasant under various circumstances. Dalit women undergo various sufferings and ordeals where the sexual harassment is the most common. In early days, when caste system and Varna system was initialised, Dalit women are treated as devadasi/ jogini where they would be sexually exploited by the upper caste people as a cultural practice. There was no law or regulations that could drop this atrocity. Even after 4000 years, there are many old traditions and practices in existence among the places like Karnataka, Andhra, etc
This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-moun... more This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-mounted Permanent Magnet Synchronous Motors (SPMSMs) fed by a single inverter. For stable parallel operation of synchronous motors with a single inverter, each motor has to be constantly kept in the synchronization state regardless of load torque. If the master motor with the larger load is controlled, the synchronous state will be maintained. Therefore, detection of the master motor is essential. Conventionally, the master motor is determined by comparing the rotor position error from the relation between the back-EMF for torque angle and the flux position; consequently, the position sensor is deemed essential for finding the rotor position. The parallel sensorless speed control method proposed in this paper uses no position sensor, instead it compares the flux-axis current from the connection between the back-EMF for torque angle and current in unbalanced load conditions. The results of simulation and experiment conducted verify the efficacy of the proposed method.
Transactions of Nonferrous Metals Society of China, 2009
Biosorption of Cr(VI) on sulfuric and phosphoric acid-treated Datura stramonium fruit was investi... more Biosorption of Cr(VI) on sulfuric and phosphoric acid-treated Datura stramonium fruit was investigated in batch mode. The various parameters that influence the biosorption process such as Cr(VI) initial concentration, biosorbent dosage, contact time, temperature, and pH value were optimized. Both linear and non-linear regression analysis of isotherm data suggest that Langmuir isotherm model mimics the behavior of Cr(VI) ion biosorption onto Datura stramonium fruit biosorbent. The maximum Cr(VI) ions adsorption capacity of 138.074 mg/g at pH 2 is achieved with phosphoric acid treated Datura stramonium (PDSF). The kinetics of adsorption process is well described by pseudo-second-order model with high R 2 and low χ 2 value. The estimated activation energy of < 8 kJ/mol obtained for both raw and chemically modified adsorbents suggests that the adsorption occurs mainly via physisorption. Besides, thermodynamic results reveal that biosorption of Cr(VI) on both treated and untreated Datura stramonium was endothermic, spontaneous, and randomness in nature.
Coalbed methane is formed by geological or biological process in coal seams, which offers signifi... more Coalbed methane is formed by geological or biological process in coal seams, which offers significant environmental benefits over other fossil fuel. Ecosystem/biological study is more susceptible to exploration for CBM/Natural gases reservoir but there are few studies that have been conducted on the environmental impacts of this type of resource extraction. The present paper discussed about the prospect of CBM reservoir on the basis of ecological marks. In this regardstwo distinguish field chosen are CBM producing area and non-mining/CBM area. Samples of Soil, Water and Coalhave been collected for analysis and resulted parameters correlated with each other tounderstood coalification area and probability of existing CBM reservoir on the basis of ecological substances
Environmental Science and Pollution Research, 2021
Women spend relatively more time in indoor environments in developing countries. Exposure to vari... more Women spend relatively more time in indoor environments in developing countries. Exposure to various indoor air pollutants leads them to higher health risks according to household air quality in which they reside. Particulate matter (PM) exposure with their exposure duration inside the household plays a significant role in women’s respiratory problems. This study measured size-segregated particulate matter concentrations in 63 residences at different locations. Respiratory dust depositions (RDDs) for 118 women in their different respiratory regions like head airway (HD), tracheobronchial (TB), and alveolar (AL) regions for the three PM size fractions (PM10, PM2.5, and PM1) were investigated. For different positions like light exercise and the sitting condition, RDDs values found for AL region were 0.091 μgmin−1 (SD: 0.067, 0.012–0.408) and 0.028 μgmin−1 (SD: 0.021, 0.003–0.126) for PM10, 0.325 μgmin−1 (SD: 0.254, 0.053–1.521) and 0.183 μgmin−1 (SD: 0.143, 0.031–0.857) for PM2.5, 0.257 μgmin−1 (SD: 0.197, 0.043–1.04) and 0.057 μgmin−1 (SD: 0.044, 0.009–0.233) respectively for PM1 to females. RDDs values in the AL region significantly increase as PM10 (11%), PM2.5 (68%), and PM1 (21%), confirming that for women, the AL region is the most prominent affected zone by fine particles (PM2.5).
This paper presents a comprehensive review of commercially important exudate gum from the karaya ... more This paper presents a comprehensive review of commercially important exudate gum from the karaya tree (Sterculia species). This gum is naturally available, non-hazardous, cost effective and renewable with unique properties, which make it an ideal choice over other natural or synthetic counterparts for a variety of applications in food, pharmaceutical and alike industries. Owing to a huge demand and high value of this commercially important gum, the karaya trees are being over exploited. To curb the threat to karaya trees in natural habitat, some states in India have banned the commercial production and marketing of this gum. Hence, it is required to establish a balance between gum production and species conservation, which can be done through adopting the scientific tapping methods. This review covers practices followed and past as well as recent research works carried out in production, processing, value addition and application development of this gum. It also presents compiled information on the size and importance of this gum in the world market. This review is likely to help research workers, enthusiasts and end users of natural gums.
Asian Journal of Pharmaceutical and Clinical Research, 2021
Objective: The objective of the study was to monitor the adverse drug reactions (A.D.Rs.) associa... more Objective: The objective of the study was to monitor the adverse drug reactions (A.D.Rs.) associated with antihypertensive drugs. Methods: All patients coming to the department with blood pressure systolic above 120 mmHg and diastolic above 90 mmHg and prescribed hypertensives will be screened for the study. Results and Discussion: A total of 136 patients were observed during the study. Out of 136 patients, 23 (17%) A.D.Rs. were recorded. A study conducted by Ramesh et al. in the Indian capital reports that 22.3% of the patients experienced A.D.Rs. Conclusion: Furthermore, any appearance of A.D.Rs. due to side effects of the drugs or due to bad control and patients non-compliance, it was treated mainly by decreasing the doses of the drugs, switching them to another active substance from the same pharmacological group, or by adding more active substances from different pharmacological groups in lower dosages to achieve the B.P goals.
National Journal of Physiology, Pharmacy and Pharmacology, 2021
Background: Lipoprotein (a) (Lp[a]) is a thrombogenic and atherogenic molecule. Several studies h... more Background: Lipoprotein (a) (Lp[a]) is a thrombogenic and atherogenic molecule. Several studies have shown Lp(a) as an independent risk factor for stroke. The casecontrol study was done in West Godavari district of Andhra Pradesh. Aims and Objectives: To estimate the levels of serum lipoprotein (a) in patients with acute ischemic stroke and the association. Materials and Methods: Lp(a) was quantified by immunoturbidimetric method and lipid profile by enzymatic method. Results: The serum Lp(a) levels were significantly elevated (P < 0.001) in cases (62.5 ± 18.3 mg/dl) as compared to controls (21.7 ± 7.1 mg/dl). Conclusion: Elevated Lp(a) is a risk factor for stroke and might play an important role in the genesis of cerebrovascular thrombosis. It may be appropriate to assess Lp(a) levels in Indians along with routine lipid profile testing in subjects with other risk factors.
In this paper we presented how a physical system can be represented as a mathematical model. We u... more In this paper we presented how a physical system can be represented as a mathematical model. We used MATLAB’s symbolic mathematics tool to solve the system dynamic equations. These systems are highly non-linear, so we linearized the system at unstable fixed points using Taylor series expansion and optimal control algorithms such as Linear Quadratic Regulator(LQR) to balance the system at the desired position. Results discussed.
Nasopharyngeal Carcinoma (NPC) frequently occurs in the epithelial lining of the nasopharynx. It ... more Nasopharyngeal Carcinoma (NPC) frequently occurs in the epithelial lining of the nasopharynx. It is a common cancer occurring in Southern China and South East Asia, while this disease is comparatively rare in most other parts of the world. Development of the disease is closely related to genetic, viral, environmental and dietary factors. Among these, Epstein Barr Virus infection is consistently associated with NPC. Cancer stem cells (CSC), a subset of cancer cells within a tumor having the ability to self renew and differentiate, are recently reported to be closely related with recurrence of tumours. In comparison, using the ability of exclusion of the DNA dye Hoechst 33342 as the parameter, side population (SP) cells can be isolated form the heterogeneous cell populations in tumour mass. SP cells may share characteristics of CSCs, both being enriched for tumor initiating capacity, and resistance to chemotherapy and radiotherapy. Although SP cells and CSCs were recently reported in ...
Most of the worldly problems and suffering are result of our loss of faith in basic humanity that... more Most of the worldly problems and suffering are result of our loss of faith in basic humanity that bind us together as human family. In this point of time when we have given priority to material benefits above humanity, where we are lost in matrix created by us, we need a guide. Buddhism, as a path shows man how to live in harmony and peace with his fellow beings. If we are aware of the fundamentals, we will find a way from the vast body of experiences that comes to us as Buddhism, which is relevant in our life and type of problems we are facing in today’s world.
Introduction: Etiology of Pancreatitis continues to stir up controversy. The incidence of acute p... more Introduction: Etiology of Pancreatitis continues to stir up controversy. The incidence of acute pancreatitis has been reported to vary around the world in different studies. The etiological profile of pancreatitis may be different in different parts of the world and it is therefore important that experiences from different parts of the country be recorded. Alcohol was once thought to be most common etiology. Recent studies in western countries show that non-alcoholic causes include more than 50% of causes of pancreatitis. Aim: The aim this study was to know the etiological factors of pancreatitis and to compare the serum amylase, lipase levels in alcoholic and nonalcoholic patients. Materials and methods: This was a prospective observational study conducted in Gandhi Medical College and Hospital, Secunderabad from December 2012 to November 2014 with duration of 2 years. 75 patients were included in this study according to inclusion and exclusion criteria. Detailed history along with...
The combined mean normal lapse rates for 0000 and 1200 UTC for 35 Radiosonde (RS) stations based ... more The combined mean normal lapse rates for 0000 and 1200 UTC for 35 Radiosonde (RS) stations based on the period 1971-99 during the summer months (March to May) were worked out for standard levels and analysed. To know whether any relationship exists between the distribution of summer lapse rates and the all India summer monsoon rainfall (June to September), the mean lapse rates for three good monsoon years and six deficient years during the same period were worked out separately and the Lapse Rate Anomalies (LRAs) were examined in detail. In excessive monsoon rainfall years the LRAs were generally negative (instable atmosphere) during summer months (March-May) in the lower and middle troposphere and the anomalies were positive in the upper troposphere. In the deficient monsoon years, the case is reverse i.e., LRAs were positive in the lower troposphere (inhibiting the convective activity) while they were negative in the middle and upper troposphere. The same results were noticed...
Language as a medium could be pleasant or unpleasant under various circumstances. Dalit women und... more Language as a medium could be pleasant or unpleasant under various circumstances. Dalit women undergo various sufferings and ordeals where the sexual harassment is the most common. In early days, when caste system and Varna system was initialised, Dalit women are treated as devadasi/ jogini where they would be sexually exploited by the upper caste people as a cultural practice. There was no law or regulations that could drop this atrocity. Even after 4000 years, there are many old traditions and practices in existence among the places like Karnataka, Andhra, etc
This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-moun... more This paper proposes a sensorless speed control algorithm for parallel-connected dual Surface-mounted Permanent Magnet Synchronous Motors (SPMSMs) fed by a single inverter. For stable parallel operation of synchronous motors with a single inverter, each motor has to be constantly kept in the synchronization state regardless of load torque. If the master motor with the larger load is controlled, the synchronous state will be maintained. Therefore, detection of the master motor is essential. Conventionally, the master motor is determined by comparing the rotor position error from the relation between the back-EMF for torque angle and the flux position; consequently, the position sensor is deemed essential for finding the rotor position. The parallel sensorless speed control method proposed in this paper uses no position sensor, instead it compares the flux-axis current from the connection between the back-EMF for torque angle and current in unbalanced load conditions. The results of simulation and experiment conducted verify the efficacy of the proposed method.
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Papers by Shravan Kumar