نتایج جستجو برای: natural succession
تعداد نتایج: 491902 فیلتر نتایج به سال:
Ayurveda, the science of life identifies man as an embodiment of nature. It encloses the essential concepts in various streams of Indian philosophy. Theory of instantaneous or ksanikavada is a significant concept in Buddhism, according to which all the universal things are momentary. A similar thought can be seen in Ayurveda known as Svabhavoparama or natural destruction, this expounds that all...
The speakers in this session dealt with practical and philosophical approaches to the protection and management of Hawaiian ecosystems. Problems in monitoring and restoring ecosystems were considered; allowances for fundamental natural processes such as succession, cohort senescence, gene transfer and bottlenecks, and natural selection were discussed; and the immense problem of preserve design ...
determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...
The BosWash corridor is a megalopolis, or large urbanized region composed of interconnected transportation, infrastructure, physiography, and sociopolitical systems. Previous work has not considered the as an integrated, holistic ecosystem. Building on emerging field infrastructure ecology, conceptualized here biome, this concept applied to region’s energy transition post-fossil fueled heating ...
The effect of forest disturbance on the lidar waveform and the forest biomass estimation was demonstrated by model simulation. The results show that the correlation between stand biomass and the lidar waveform indices changes when the stand spatial structure changes due to disturbances rather than the natural succession. This has to be considered in developing algorithms for regional or global ...
Scientific Events: Investigations of Locusts; The Field Museum of Special Articles: Natural History; California Academy of Sciences Size of Infection as an Influence on the PersisExpedition to Revillagigedo Archipelago; Awards tence of Adult Trichinae in Rats: DR. 0. R. MCof the Elizabeth Thompson Science Fund; GeoCOY. Succession of Forests as Indicated by Fossil physical Research at Harvard Un...
Species diversity commonly increases with succession and this relationship is an important justification for conserving large areas of old-growth habitats. However, species with different ecological roles respond differently to succession. We examined the relationship between a range of diversity measures and time since disturbance for boreal forest beetles collected over a 285 year forest chro...
Classical old-field succession studies focused on vegetation changes after the abandonment of annual croplands or on succession after the elimination of cultivated crops. Perennial-crop-mediated succession, where fields are initially covered by perennial crops, reveals alternative aspects of old-field succession theories. We tested the validity of classical theories of old-field succession for ...
The first total synthesis of the biologically significant bis-indole alkaloid dragmacidin D (5) has been achieved. Thermal and electronic modulation provides the key for a series of palladium-catalyzed Suzuki cross-coupling reactions that furnished the core structure of the complex guanidine- and aminoimidazole-containing dragmacidins. Following this crucial sequence, a succession of meticulous...
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