Three Minute Thesis - Bangladesh Region | 2019

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Food additives and chemicals can negatively impact health. Some chemicals have been linked to birth defects and developmental issues when consumed, especially during pregnancy and childhood. People should carefully consider the potential risks of chemicals in foods.

Chemicals in Food: Think Before Eat
Adulterated Foods Toxic Chemicals Developmental Phases Birth Defect

This series of predictable changes that occurs in a community over time is called ecological succession.In another words, Ecological succession is the change in species composition over time; that is, the replacement of one group of species by another group of species. There are two major types of ecological succession: primary succession and secondary succession. In primary succession, a site that is initially absent of species becomes colonized for the very first time. In secondary succession, a site that supports an existing assemblage of species experiences a disturbance that changes the composition of species. Both types of succession can occur in terrestrial and aquatic ecosystems. The first species to arrive and colonize the newly formed habitat are pioneer species. These early colonizers contribute nutrients to the soil through organic matter accumulation from decomposition. Some early successional plant species can fix atmospheric nitrogen and thereby increase nitrogen availability in the soil for other plants. As soil nutrients increase over succession it allows for the colonization of previously nutrient-limited species that were unable to establish initially. This facilitates the turnover in species composition over time. In terrestrial ecosystems, this compositional shift corresponds to a change in life forms and distinct species assemblages transitioning from small herbaceous plants, to shrubs, and ultimately to stands of trees over the course of succession. Secondary succession in terrestrial ecosystems can initiate after fire, tornadoes/ hurricanes, or humans disturb an already established plant community, removing most species but leaving the soil intact. The disturbance changes exposure of the habitat to sunlight, wind, and water that alters colonization and the assemblage trajectory of the new plant community. Some plant species may arrive to the disturbed site from

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We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and 30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1 . Our search finds no candidates at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to infer the properties of the evolving luminosity function without binning in redshift or luminosity that marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results, and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5 from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical models for evolution of the dark matter halo mass function.

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