The alkaloids present in the flowers of Erythrina stricta have been isolated and characterized by spectroscopic methods. A new alkaloid 11-acetyl erysotrine has been isolated and its structure established by spectral studies (UV, IR, 1H NMR and HRMS).

WAVELENGTH MODULATION SPECTROSCOPIC CHEMICAL SENSING USING A PIEZO-ELECTRIC TUNABLE FIBER BRAGG GRATING LASER Michael Buric, M.S. University of Pittsburgh, 2005 Real time gas sensing is paramount to numerous applications in industry as well as in the consumer sector. Many gas sensing applications such as fossil energy production require lowcost, multi-species sensors that are able to operate in...

Laser spectroscopic studies of elements in the heavy actinide and transactinide region help understand nuclear ground state properties these systems. Pioneering experiments at GSI, Darmstadt identified first atomic transitions element nobelium. For purpose determining nobelium isotopes with higher precision, a new apparatus for high-resolution laser spectroscopy gas-jet called JetRIS is under d...

Simultaneous assessment of the spectroscopic absorption signal of gas enclosed in a scattering medium and the corresponding optical path length of the probing light is demonstrated using a single setup. Sensitive gas absorption measurements are performed by a tunable diode laser using wavelength-modulation spectroscopy, while the path length is evaluated by the frequency-modulated cw technique ...

Herschel will represent a breakthrough in the study of nearby gas-rich and gas-poor galaxies, as it will for the first time permit imaging photometric and spectroscopic observations of their ISM in the FIRsubmm wavelength range. The unprecedented sensitivity and angular resolution of Herschel will furthermore yield a breakthrough in our understanding of distant galaxies and AGN, as their gas an...

Background: Ethnobotanical survey in the rural villages Nepal revealed that fruits of Rhus chinensis Mill. have been using for treatment diarrhea and dysentery. Objective: To evaluate antimicrobial antioxidant effects, identification chemical constituents R. chinensis. Materials Methods: Phytochemical screening was performed on hexane 70% methanolic extracts sample followed by gas chromatograph...

Fried and baked banana-based snacks are popular in South East Asia and banana chip is popular in other countries, such as India, Indonesia, China, African countries, etc; these snacks may contain acrylamide in concentration which may be of concern due to its toxicity. This study was carried out to determine acrylamide concentration in popular banana based snacks in Malaysia using a modified met...

Recent progress in the development of room temperature, continuous wave, widely tunable, mode-hop-free mid-infrared external cavity quantum cascade laser (EC-QCL) spectroscopic sources is reported. A single mode tuning range of 155 cm−1 (∼ 8% of the center wavelength) with a maximum power of 11.1 mW and 182 cm−1 (∼ 15% of the center wavelength) with a maximum power of 50 mW was obtained for 5.3...

An improved micro-reactor cell for IR spectroscopic studies of heterogeneous catalysis was built around a 5.8 GHz microwave cavity. The reactor can operate at 20 bars and with conventional heating up to 720 K, with reactant gas flows velocities (GHSV) from 25,000 to 50,000 h(-1). The temperature of the sample under microwave irradiation was measured by time resolved IR emission spectroscopy. Th...

We analyze radial velocities for a sample of 31 Class I and flat spectrum protostars in TaurusAuriga, ρ Ophiuchi and Serpens for evidence of the global dynamical state of extremely young stellar populations buried within parental molecular clouds. Comparing the radial velocity of each protostar to that of the local CO gas, we are able to constrain the one dimensional radial velocity dispersion ...