Interactions between different media and follicle‐stimulating hormone supplementation on in vitro culture of preantral follicles enclosed in ovarian tissue derived from collared peccaries (Pecari tajacu Linneaus, 1758)

The aim was to verify the effect of follicle‐stimulating hormone (FSH) supplementation to α‐MEM+ or TCM199+ media on the in vitro development of ovarian preantral follicles (PFs) derived from collared peccaries. Ovaries (n = 5 pairs) were collected and divided into fragments destined to control group (non‐cultured) or treatments that were cultured for 7 days. The PFs morphology, growth and activation were evaluated by classical histology. The immunohistochemistry markers Ag‐NOR and PCNA were used for nuclear proliferation analysis, and the picrosirius red labelling was used for ovarian extracellular matrix (ECM) evaluation. After 7‐day culture, only the TCM199+ treatment maintained the proportion of intact PFs similar to day 1 (63.2%), but no differences were found among treatments (p > .05). In addition, a significant increase in the growing follicles proportion was verified for all the treatments, indicating follicular activation (p > .05). By the Ag‐NOR analysis, only the TCM199+/FSH maintained the nuclear proliferation similar to the first day (p > .05). The picrosirius red staining revealed that the ECM remained intact in all the treatments (p > .05). We suggest the use of TCM199+ medium supplemented of FSH for the in vitro development of peccaries PFs under 7‐day culturing conditions.     

Inhibitory activity of homoisoflavonoids from Caesalpinia sappan against Beauveria bassiana

Four homoisoflavonoids, 4-O-methylsappanol (1), protosappanin A (2), brazilin (3) and caeasalpin J (4), isolated from Caesalpinia sappan, were tested for inhibitory activity against Beauveria bassiana. Compound 1 showed activity against this fungus.     

Simulation of soil moisture profiles for scheduling of irrigations

A mathematical model for simulating soil water content in the root zone was developed by taking into consideration soil physical properties, crop and climatic parameters. The governing differential equation for unsaturated flow of water in the soil was solved numerically using the Crank-Nicholson finite difference technique. The water uptake by plants was simulated by using two different sink functions. The model predictions were in good agreement with field data and thus it is possible to schedule irrigations.     

A selection procedure in wheat for stress environment

Summary A simple and effective selection procedure for identifying lines with wide adaptation and ability to do well under drought is outlined, supported with experimental data involving diverse and high yielding populations of bread wheat.The effect of selections for local adaptation to stress environment is found to be inferior as compared to selection for developmental traits in a favourable environment. Data on selection for developmental traits have shown favourable correlated associations with more precision in the estimate of components of genetic variation and heritability and larger magnitude of response to selection as compared to selection for yield components in stress environment.The developmental characters such as early vigour and synchronous tillering, days to heading and ear length which show stability over different environments are found to be important components of wide adaptation and productivity under moisture-stress.Presented at the Symposium on Planning for the Drought of the National Institute of Sciences, held in New Delhi, India, 4–6 May, 1969.     

A genetic study of popping quality in Sorghum (Sorghum bicolor (L.) Moench)

Summary Two crosses of sorghum, Sorghum bicolor (L.) Moench (IS 1054 × ICSV-1, and IS 5604 × IS 1054) were evaluated in parental, F1, F2, and backcross generations for the variation in their popping quality as measured by pop volume (ml). Dominance was in the direction of low pop volume. Dominance and additive gene effects, in that order, governed most of the variation, while significant dominance x dominance type of interaction effects could also be detected. There was no evidence for higher order gene interactions.Approved as Journal Article 630 by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, P.O. 502 324, Andhra Pradesh, India.     

Numerical simulation of the movement of the 1991 oil spills in the Arabian Gulf

The output from the modified version of a hydrodynamical numerical model developped earlier by El-Sabh and Murty (1988) has been used to hindcast the movement and dispersion of oil slicks in the Arabian Gulf during part of the period of January to March 1991. While other studies on numerical simulations of this event pertain mainly to the Al-Ahmadi spill, the present study simultaneously examines the movement of oil from not only this source but also from Mina Al-bakr and clearly delineates the impact of oil from each of these sources. The numerical model is used for computing the currents due to tides, winds and bathymetric influences. This model has only one open boundary at the strait of Hormuz where the incoming tide is prescribed. The model time step is 100 seconds, sufficient to resolve the hydrodynamical effects. However, the slick movement simulations are carried out with current fields determined at hourly intervals. The surface wind field has been computed from synoptic weather charts using the geostropic relationship, supplemented by some climatological data. The oil slick is advected by the net current as obtained above and the lateral spreading of the oil is simulated through a random walk process with an appropriate eddy diffusion coefficient. The influence of the magnitude of the eddy diffusion coefficient on the spread of the oil is examined in detail. Refloatation of beached oil parcels is also considered in the model simulations. The model simulations are compared with slick location as obtained from remotely sensed observations. The importance of real-time winds in spill movement prediction is demonstrated through a comparison with model simulations obtained with monthly mean climatological winds.     

A study of the gaseous and particulate pollutants in the environment of a thermal power plant project area

Observations on gaseous and particulate pollutants were undertaken at four locations in the region of a thermal power plant (TPP), which is under construction at Tuticorin, south India. The predicted concentrations Of SO₂ due to the emissions from the TPP and its possible impact on the inhabitants and climate in the downwind region were evaluated. Also, the predicted concentrations downwind of a Petrochemical Industrial Complex (PIC) located in the vicinity of the TPP were computed and compared with the measured concentrations. The predicted maximum concentration of SO₂ at 6 km downwind of TPP is about 530 μg m^?3 under most favourable wind conditions. The anticipated increase in SO₂ due to the thermal power plant under construction may therefore be substantial. The predicted concentrations Of SO₂, at a distance of 1.8 km downwind of the PIC, varied between 34 and 216 μg m^?3 for wind directions ranging from 70 to 90° and for Pasquill stability category C. The plume would be over the observational site when the wind direction is 80°. The maximum measured concentration was 23 ug m^?3. The discrepancy was due to the rapid fluctuations in the wind direction during the observational period over a wide range from 20 to 90°.     

Observations of Aitken nuclei and trace gases in different environments in India

Surface measurements of Aitken nuclei have been made at a few representative environments in India. The periods of measurements have ranged from a few days to a few years depending upon the place of measurement. Aircraft measurements of Aitken nuclei were made at one of the locations during three successive monsoon periods. During part of the time simultaneous measurements were made of the trace gases SO₂, NH₃, NO₂, and O₃. The study presents the seasonal and diurnal variation of Aitken nuclei in the different environments and their association with the trace gas concentrations.