Two photon annihilation operators and squeezed vacuum

Inverses of the harmonic oscillator creation and annihilation operators by their actions on the number states are introduced. Three of the two photon annihilation operators, viz., a(sup +/-1)a, aa(sup +/-1), and a(sup 2), have normalizable right eigenstates with nonvanishing eigenvalues. The eigenvalue equation of these operators are discussed and their normalized eigenstates are obtained. The Fock state representation in each case separates into two sets of states, one involving only the even number states while the other involving only the odd number states. It is shown that the even set of eigenstates of the operator a(sup +/-1)a is the customary squeezed vacuum S(sigma) O greater than

Comparison of temperature coefficient of standard inductor by measuring change in inductance and resistance

Standard inductors manufactured by General Radio (GR) are widely used by NMIs. The temperature coefficient for these standard inductors is 30 ± 5 ppm/°C, as per manufacturer. NPL India (NPLI) had earlier determined the temperature coefficient of standard inductors by measuring change in inductance. Now by measuring change in resistance, temperature coefficient of inductors is re-determined. Temperature coefficients determined from the two methods are reported here

Cost of Conservation of Agrobiodiversity

The cost of conservation of germplasm stored in gene banks i.e., ex-situ collections has been studied in other parts of the world to estimate direct and indirect contributions by various actors involved in conservation. This is the first study of its kind in India done in collaboration with National Bureau of Plant Genetic Resources, New Delhi. This was part of a sponsored research by Centre for Development Research, Germany. The limitations of this study are also listed so that future research in this regard can be pursued better. One of the costs not included is the cost of sharing data with local communities for enabling them to access germplasm in times of need. This is an important component of conservation and would require translation of gene bank and associated database in local language, making them available through public kiosks. This cost has not been included in any study on the subject so far. Separately, studies are underway to look at the conservation of germplasm under in-situ conditions.

Effect of Organic Manures on the Growth and Yield Attributes of Spinach Beet (Beta vulgaris var bengalensis) at Low Hills of Uttarakhand

A field experiment was planned and conducted during 2020-21 at Horticulture Research Block, Department of Horticulture, School of Agricultural Sciences, SGRR University, Dehradun, Uttarakhand to investigate the “Effect of different organic manures on the growth and yield attributes of spinach beet at lower hills of Uttarakhand”. The experiment was laid out in randomized block design with three replications and nine treatments including various organic manures at different concentrations. Observations on various growth and yield attributes were recorded at regular intervals. Studies on vegetative and yield attributes were recorded using standard method of measurements. Among all the organic treatments, soil application with Farmyard manure (5kg) + Vermicompost (2.5kg) + foliar spray of Vermiwash (25%) was sown the significant improvement in plant height (cm), number of leaves per plants, length of leaves (cm), width of leaves (cm), petiole length (cm), root length (cm) and yield than other treatments. View Article DOI: 10.47856/ijaast.2021.v08i11.00

Chronic LD50 vs safest dose for the methanolic extract of curry leaves (Murraya koenigii) cultivated in Malaysia

Curry leaf viz. Murraya koenigiil eaves (MKL) is an ancient Ayurvedic medicinal plant that has recently been described as possessing robust anti-inflammatory and antioxidant activities. The current study was conducted to determine the long-term LD50 of the methanolic extract of MKL during daily oral administration. Five groups of Sprague Dawley rats were recruited into the study. Each group comprised of six rats including the control group (1). The oral MKL doses used for groups (2) to (5) were 50, 100, 200 and 400 mg/kg/day, respectively for a duration of ten weeks. The daily measured toxicity parameters were food and water consumption, body weight, general activity in forced swimming test and the cumulative mortalities. Group (5) showed 100% mortality within the first month of the study. Group (4) showed 50% mortality with signs of toxicity for the other 3 animals. Group (3) showed no mortalities but signs of toxicity for one animal were observed. No mortalities or toxicity signs were observed for any of group (2) animals. It can be concluded that the chronic LD50 for Malaysian cultivated MKL is 200 mg/kg/day, and the safest dose of MKL methanolic extract that can be implemented for long-term studies should not exceed 50 mg/kg/day

Role of medical thoracoscopy in the management of parapneumonic effusion and empyema thoracic

Background: The treatment modality use in early pleural empyema mainly depends on the antimicrobial therapy along with thoracocentesis. In case of complicated empyema this modality does not work and lung not fully expand, until removal of adhesions. The main purpose of the current study is to analyze the experience of management of complicated parapneumonic effusion and empyema thoracic through rigid medical thoracoscopy under local anaesthesia. Aim and objective is to study the role of medical thoracoscopy in the management of empyema thoracic and parapneumonic effusion at tertiary health centre.Methods: This is a descriptive case series study in which 49 patients were recruited, who have clinically and radiologically show empyema thoracic, from department of Respiratory medicine, GMC, Kota, Rajasthan. All patients underwent medical thoracoscopy under local anesthesia. Written Informed consent was taken from the study participants. Ethical approval was obtained from Ethical Review Committee of the hospital. Patients who have HIV and Hbsag positive, those with multiple organ failure and bleeding disorders were excluded.Results: Total 49 patients, out of them 41(84%) were male and 8(16%) were female with mean age 45 years (range 18 to 70 years). Final evolution through chest x-ray revealed complete resolution or successful thoracoscopy done in 37 case of fibrinopurulent (92.50%) and 5 cases of organizing empyema (55.56%). overall success rate 85.71%. Total 7 cases (3 case of fibrinopurulent and 4 cases of organizing empyema) refer to higher center for decortications.Conclusions: Medical Thoracoscopy under local anaesthesia is a safe procedure, efficient and cost-effective intervention for early management of complicated empyema, particularly in early stage of empyema (fibro purulent)