171 research outputs found
Biochemical changes in agarwood tree (Aquilaria malaccensis Lamk.) during pathogenesis
Post-infection changes in sugars, ascorbic acid, phenols and protein of agarwood tree (Aquilaria malaccensis) were investigated after inoculation with fungi such as Chaetomium globosum and Fusarium oxysporum. In healthy trees, the biochemical constituents increased, whereas in infected trees they decreased after inoculation with fungi.
 
Photo-enhanced lithium-ion batteries using metal-organic framework
The development of photo-enhanced lithium-ion batteries, where exposing the electrodes to
light results in higher capacities, higher rate performance or self-charging, has recently gained
substantial traction. The challenge in these devices lies in the realisation of photo-electrodes
with good optical and electrochemical properties. Herein, we propose copperhexahydroxybenzene as the active photo-electrode material which both harvests light and
stores energy. This material was mixed with reduced graphene oxide as a conductive additive
and charge transfer medium to create photo-active electrodes. Under illumination, these
electrodes show improved charge storage kinetics resulting in the photo-accelerated charging
and discharging performance (i.e. specific capacities improvement from 107 mAh g-1
to 126
mAh g-1
at 200 mA g-1
and 79 mAh g-1
to 97 mAh g-1
at 2000 mA g-1
under 1 sun illumination
as compared to dark)
XRD and FT-IR investigations of sub-bituminous Assam coals
Two coal samples collected from Makum coal field,
Assam, India were studied by XRD and FT-IR techniques.
The X-ray diffractogram shows the existence of some
crystalline carbons in Assam coals as proven by the
appearance of peaks. The radial distribution functional
(RDF) method was applied for the determination of
structural aspects of the coals. The study indicates that
the coals are lignite in type and there is no evidence of
graphite-like structures. The maximum in the G(r) plots
of function of radial distribution of atoms (FRDA) relates
to different distances between carbon atoms of aliphatic
chains. The first significant maximum relates to the C-C
bond (type C-CH=CH-C), the second maximum relates
to the distance between carbon atoms of aliphatic chains
that are located across one carbon atom. The curve
intensity profiles obtained from FRDA show quite regular
molecular packets for this coal. The coals were found to
be lignite in nature. FT-IR study shows the presence of
aliphatic carbon, C=O and C-O stretching associated with
-OH and -NH stretching vibrations. Kaolinite and quartz
were also found to be major minerals in Assam coals by
FTIR spectroscopy. The difference in intensities of
carbonyl groups of the coal samples is likely to relate
with the rank. © Indian Academy of Sciences
Achievability of Municipal Solid Waste Compost for Tea Cultivation with Special Reference to Cadmium
Not AvailableMunicipal solid waste compost (MSWC) is quite often used for soil amendment in agricultural crops and yet little is known about its effect on tea (Camellia sinensis L.) cultivation. This study investigates the effect of MSWC application on cadmium (Cd) concentrations in soil, tea plants, and infusions. Different doses of MSWC are added to soil with two Tocklai vegetative (TV) tea clones (TV1 and TV23) for 2 years in pot experiments. Several fractions of Cd in amended soils, biomass yield, and Cd content in different parts of tea plants and in tea infusions are measured. Several indexes related to risk assessment are also calculated. The geo‐accumulation index values of Cd in soil amended with MSWC ranges from −1.74 to 3.12, indicating class 0 (practically uncontaminated) to class 4 (heavily contaminated) contamination level. Average daily intakes (ADI) of Cd through tea infusion produced from tea plant amended with MSWC are 8.9 × 10−6 and 9.2 × 10−6 mg kg−1 per body weight and day for men and women, respectively. These values are much lower than those given in the Joint FAO/WHO Provisional Tolerable Monthly Intake Guideline for Cd. The non‐carcinogenic risk values (also called hazard quotient) for Cd, estimated from the ADI values, are found to be 1.78 × 10−2 and 1.94 × 10−2 mg kg−1 per day for men and women, respectively, suggesting no health hazard. The results suggested the possibility of management of MSW through composting and the feasibility of compost application for tea cultivation.Not Availabl
Studies on uracils 10. A facile one-pot synthesis of pyrido(2,3-d) and pyrazolo (3,4-d) pyrimidines
Studies on uracils : synthesis of novel pyrido[2,3-d]- pyrimidine oxides via ring transformation of isoxazolo[3,4-d]pyrimidine
The reaction of isoxazolo[3,4-d]pyrimidine 1 and cyanoolefins 2 in the presence of triethylamine (Et3N) as a catalyst
afforded an unprecedented one-pot synthesis of biologically important pyrido[2,3-d]pyrimidine oxides 3 in excellent yields
Antifungal activity and chemical composition of Citrus reticulata Blanco essential oil against phytopathogens from North East India
The essential oil (EO) isolated by hydro-distillation from the peel of fully matured ripen fruits of Citrus
reticulata Blanco were analyzed by GC and GC 13MS. Thirty seven different components were identified
constituting approximatel
- …