Seasonal O variations in precipitation, soil water, snowmelt, spring flow and stream baseflow were analyzed to characterize seasonal dynamics of groundwater recharge in three central Pennsylvania catchments. The catchments represented three common landscape types: Valley and Ridge-shale (Mahantango Creek), Valley and Ridge-carbonate (Buffalo Run), and Appalachian Plateau-sandstone (Benner Run)....

Dubois (1929), Rees (1932), Wesenburg-Lund (1934), Rothschild (1941), Wikgren (1956), Deforest (1957), Khan (1960a, b), Radke et all (1961), Larson (1961), Ewers (1964) and Basch (1966) have studied the larval trematodes infecting the different molluscan hosts. The seasonal variations of infection of larval trematodes in India have been studied by Soparkar (1921) Sewell (1922), Chatterji . (193...

To the Editor: Seasonal climate variations are notably known to affect mood in both individuals with and individuals without mental disorders.1,2 Intriguingly, the prevalence of mood disorders differs greatly from one country to another. For example, lifetime prevalence has been measured at 21% in France and the United States, compared with under 5% in Nigeria.3 Since seasonal variations could ...

Results of a preliminary study of seasonal variations of gold content in Harris Creek were given by Day and Fletcher (1987a). Suhsequently,DayandFletcher(1987h)presenteda model for transport of gold in Harris Creek and suggested that heavy-mineral concentrates collected from bar-head gravels could provide a good exploration medium. To study seasonal variations at such sites, bar-head gravels at...

The incidence and seasonal variations of acute primary angle-closure glaucoma (APACG) was studied. It was based on a retrospective chart review of 121 hospital patients in Split, Croatia for the fifteen-year period from 1985 through 1999. The average incidence was 4.1 cases per 100,000 per year in the total population and 7.1 per 100,000 in those aged 30 years and older. APACG affects women alm...

The surface layer of the ocean undergoes temperature variations which occur at several different temporal scales: a diurnal cycle reSecting day and night variability, an annual cycle showing seasonal variations in insolation and weather, and interannual to decadal cycles, indicating large-scale, long-term climate variability. The strength of a given cycle also depends on the location, for examp...

Ž . This paper reports the total NO column TNC measurements performed in Athens, Greece 2 during the period 1996–97. The measurements used a solid-state spectrometer and were based on the spectral absorption of beam solar irradiance in the visible region. This study investigates the diurnal and seasonal variations of the total NO column in the atmosphere above Athens. It is 2 Ž . found to be in...

The recognition of seasonal patterns in infectious disease occurrence dates back at least as far as the hippocratic era, but the mechanisms underlying these fluctuations remain poorly understood. Many classes of mechanistic hypotheses have been proposed to explain seasonality of various directly transmitted diseases, including at least the following; human activity, seasonal variability in huma...

BACKGROUND Dietary vitamin D has been associated with lower mammographic breast density, a strong biomarker for breast cancer risk. Blood 25-hydroxyvitamin D [25(OH)D] is an integrated measure of vitamin D status (from food, supplements, and sun exposure) and varies with season. Our objective was to assess seasonal variations of breast density and compare such variations, if any, with that of 2...

The interactions between PM2.5 and meteorological factors play a crucial role in air pollution analysis. However, previous studies that have researched the relationships between PM2.5 concentration and meteorological conditions have been mainly confined to a certain city or district, and the correlation over the whole of China remains unclear. Whether spatial and seasonal variations exist deser...