Browsing Faculty of Natural Sciences by Title
Now showing items 1784-1803 of 2571
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Physical properties of spectroscopically-confirmed galaxies at z >= 6. II. Morphology of the rest-frame UV continuum and Lyman-alpha emission
(IOP Science, 2013)We present a detailed structural and morphological study of a large sample of spectroscopicallyconfirmed galaxies at z ≥ 6, using deep HST near-IR broad-band images and Subaru optical narrowband images. The galaxy sample ... -
The physical properties of star-forming galaxies with strong [oiii]lines at z=3.25
(IOP Publishing, 2022)We present an analysis of physical properties of 34 [O III] emission-line galaxies (ELGs) at z = 3.254 ± 0.029 in the Extended Chandra Deep Field South (ECDFS). These ELGs are selected from deep narrow H2S(1) and broad Ks ... -
Physicochemical stability of enriched phenolic fractions of cyclopia genistoides and ex vivo bi-directional permeability of major xanthones and benzophenones
(Georg Thieme Verlag, 2021)Fractions of an ultrafiltered Cyclopia genistoides extract, respectively enriched in xanthones and benzophenones, were previously shown to inhibit mammalian α -glucosidase in vitro. The present study investigated ex vivo ... -
Phytochemical components and GC–MS analysis of Petiveria alliaceae L. fractions and volatile oils
(De Gruyter, 2023)Phytochemical constituents are important in the determination of plant activities. Their presence in medicinal plants gives their therapeutic values. These phytoconstituents possesses pharmacological activities that include ... -
Phytochemical screening and biological activity studies of five South African indigenous medicinal plants
(Academic Journals, 2010)Different extracts and fractions of five selected indigenous South African medicinal plants, namely, Cissampelos capensis, Geranium incanum and three Gethyllis species, were subjected to phytochemical screening and testing ... -
PICSI vs. MACS for abnormal sperm DNA fragmentation ICSI cases: A prospective randomized trial
(Springer Nature, 2020)Purpose: To know which sperm selection technique, physiological intracytoplasmic sperm injection (PICSI) or magnetic-activated cell sorting (MACS), is better for the selection of sperm with abnormal sperm DNA fragmentation ... -
A pilot study to test psychophonetics methodology for self-care and empathy in compassion fatique, burnout and secondary traumatic stress
(AOSIS OpenJournals, 2013)Background: Home-based care is recognised as being a stressful occupation. Practitioners working with patients experiencing high levels of trauma may be susceptible to compassion fatigue, with the sustained need to remain ... -
Pineapple stem-derived bromelain based priming improves pepper seed protein reserve mobilization, germination, emergence and plant growth
(Springer, 2021)Pepper seeds are slow to germinate and emergence is often non-uniform and incomplete, reducing gains from this cash crop. This study investigated the effects of pineapple stem- derived protease (stem bromelain) based priming ... -
Pinpointing areas of increased soil erosion risk following land cover change in the Lake Manyara catchment, Tanzania
(Elsevier, 2018)Lack of long-term scientific land cover and erosional data impedes the development of sustainable land management plans to tackle land degradation and soil erosion problems in Tanzania. Using Landsat imagery, almost three ... -
Piperonylic acid alters growth, mineral content accumulation and reactive oxygen species-scavenging capacity in chia seedlings
(Oxford University Press, 2022)p-Coumaric acid synthesis in plants involves the conversion of phenylalanine to trans-cinnamic acid via phenylalanine ammonia-lyase (PAL), which is then hydroxylated at the para-position under the action of trans-cinnamic ... -
Pks 1830-211: oh and hi at z = 0.89 and the first meerkat uhf spectrum
(EDP Sciences, 2021)The Large Survey Project (LSP) "MeerKAT Absorption Line Survey"(MALS) is a blind H I 21 cm and OH 18 cm absorption line survey in the L- and UHF-bands, primarily designed to better determine the occurrence of atomic and ... -
Planck 2018 results IX. Constraints on primordial non-Gaussianity
(EDP Sciences, 2020)We analyse the Planck full-mission cosmic microwave background (CMB) temperature and E-mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). We compare estimates obtained from separable ... -
Planck 2018 results VII. Isotropy and statistics of the CMB
(EDP Sciences, 2020)Analysis of the Planck 2018 data set indicates that the statistical properties of the cosmic microwave background (CMB) temperature anisotropies are in excellent agreement with previous studies using the 2013 and 2015 data ... -
Planck 2018 results VIII. Gravitational lensing
(EDP Sciences, 2020)We present measurements of the cosmic microwave background (CMB) lensing potential using the final Planck 2018 temperature and polarization data. Using polarization maps filtered to account for the noise anisotropy, we ... -
Planck 2018 results. XI. Polarized dust foregrounds
(EDP Sciences, 2020)The study of polarized dust emission has become entwined with the analysis of the cosmic microwave background (CMB) polarization in the quest for the curl-like B-mode polarization from primordial gravitational waves and ... -
Planck 2018 results: I. Overview and the cosmological legacy of Planck
(EDP Sciences, 2020)The European Space Agency’s Planck satellite, which was dedicated to studying the early Universe and its subsequent evolution, was launched on 14 May 2009. It scanned the microwave and submillimetre sky continuously between ... -
Planck 2018 results: II. low frequency Instrument data processing
(EDP Sciences, 2020)We present a final description of the data-processing pipeline for the Planck Low Frequency Instrument (LFI), implemented for the 2018 data release. Several improvements have been made with respect to the previous release, ... -
Planck 2018 results: III. High frequency instrument data processing and frequency maps
(EDP Sciences, 2020)This paper presents the High Frequency Instrument (HFI) data processing procedures for the Planck 2018 release. Major improvements in mapmaking have been achieved since the previous Planck 2015 release, many of which were ... -
Planck 2018 results: IV. Diffuse component separation
(EDP Sciences, 2020)We present full-sky maps of the cosmic microwave background (CMB) and polarized synchrotron and thermal dust emission, derived from the third set of Planck frequency maps. These products have significantly lower contamination ... -
Planck 2018 results: V. CMB power spectra and likelihoods
(EDP Sciences, 2020)We describe the legacy Planck cosmic microwave background (CMB) likelihoods derived from the 2018 data release. The overall approach is similar in spirit to the one retained for the 2013 and 2015 data release, with a hybrid ...