22 research outputs found
Gender Differences in Assessing the Impact of Inter-Parental Conflict on Students Academic Achievement Motivation in Ruiru Sub County Kenya
No full textResearch suggests children of different gender exposed to a similar environment of inter-parental conflict may have varying responses. While the impact of inter-parental conflict may be similarly damaging for both girls and boys, they may have different reactions to conflict and hostility between their parents. This necessitates the need to comprehensively understand why some children may be more vulnerable to the impact of inter-parental conflict than others. In this paper, the author seeks to establish the perception of who between the male and female students is mostly affected by inter-parental conflict in terms of academic achievement motivation. The study was guided by Fincham’s cognitive contextual framework theory and adopted a mixed method research design. A total of 281 students participated in the study. Purposeful sampling was used to select guidance and counseling teachers and parents of the students. Proportionate stratified sampling technique was used to select schools from the 13 public and 18 private schools in Ruiru sub-county as well as to select students from the chosen schools. Data was collected using four instruments: Children Perception of Inter-parental Conflict Questionnaire (CPIC) and Academic Motivation Survey (AMS) for Students, interview schedule for seven guidance and counseling teachers and focus group discussion for ten parents of the students. Data analysis was conducted both descriptively and using inferential statistics. In this, Pearson’s product moment correlation coefficient (r) was used to establish the relationship between inter-parental conflict and academic achievement motivation at 0.05 significance level. T-test was used to determine sex differences in inter-parental conflict and academic achievement motivation. The results were summarized in tables of frequency distribution and percentages. The results provided evidence that there was a significant gender difference with regard to inter-parental conflict and some domains of academic achievement motivation which were in favor of girls in both data sets. Keywords: Inter-parental conflict, gender differences, students, Ruiru sub-county, children perception, Academic achievement motivation.
Quantitative deconvolution of autocorrelations and cross correlations from two-dimensional lifetime decay maps in fluorescence lifetime correlation spectroscopy
No full textFluorescence correlation spectroscopy (FCS) is a widely used method for measuring molecular diffusion and chemical kinetics. However, when a mixture of fluorescent species is taken into account, the conventional FCS method has limitations in extracting autocorrelations for different species and cross correlations between different species. Recently developed fluorescence lifetime correlation spectroscopy (FLCS) based on time-tagged time-resolved (TTTR) photon recording, which can record the global and micro arrival time for each individual photon, has been used to discriminate different species according to fluorescence lifetime. Here, based on two-dimensional lifetime decay maps constructed from TTTR photon stream, we have developed a quantitative lifetime-deconvolution FCS model (LDFCS) to extract precise chemical rates for chemical conversions in multi-species systems. The key point of LDFCS model is separation of different species according to the global distribution of fluorescence lifetime and then deconvolution of autocorrelations and cross-correlations from the two-dimensional lifetime decay maps constructed by the micro arrival times of photon pairs at each delay time. (C) 2016 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved."Strategic Priority Research Program" of Chinese Academy of Sciences [XDA09040300]; Beijing Science and Technology Project [Z151100003915077]; Beijing Nova Programme [Z151100000315081]; Beijing Talents Fund [2015000021223ZK17]SCI(E)ARTICLE19-156
A Multichannel Time-Tagged Time-Resolved (TTTR) Model for Quantification of Oligomer Concentrations Based on Antibunching Effect
No full textMolecule/protein
aggregation causes many devastating and incurable
diseases in human bodies. For example, studies have revealed that
protein oligomers formed at the early stage are toxic and may be mostly
responsible for some diseases. In the fundamental research, differentiation
of different protein oligomers and quantification of the concentrations
are important and challenging. Here, we have developed a multichannel
time-tagged time-resolved (TTTR) confocal fluorescence model based
on antibunching effect to solve the problem. The key point of the
model is that n-oligomers labeled with n-dyes cannot emit more than n photons at one time.
By assuming that all labeling dyes behave perfectly as noninteractive
individual dyes, the analytic relationship between photon-emission
probability and oligomer concentrations has been derived. Simulations
have been carried out to verify the model, in which differentiation
and concentration quantification of up to tetraoligomers can be realized
with a relative error <10% in an eight-channel TTTR confocal setup
with eight single-photon detectors
Botryosphaerialean fungi associated with woody oil plants cultivated in Sichuan Province, China
No full textWoody oil plants are important economic trees which are widely cultivated and distributed throughout China. Surveys conducted during 2020 and 2021 on several woody oil plantations from five regions of Sichuan Province, China, revealed a high diversity of Botryosphaerialean fungi. The identification of 50 botryosphaeriaceous isolates was carried out based on both morphology and multi-gene phylogenetic analysis of internal transcribed spacer region (ITS), translation elongation factor 1-alpha gene (tef1) and β-tubulin gene (tub2). This allowed the identification of twelve previously known Botryosphaeriales species: Aplosporella prunicola, A. ginkgonis, Barriopsis tectonae, Botryosphaeria dothidea, Bo. fabicerciana, Diplodia mutila, Di. seriata, Dothiorella sarmentorum, Neofusicoccum parvum, Sardiniella guizhouensis, Sphaeropsis citrigena, and Sp. guizhouensis, and four novel species belonging to the genera Diplodia and Dothiorella, viz. Di. acerigena, Di. pistaciicola, Do. camelliae and Do. zanthoxyli. The dominant species isolated across the surveyed regions were Botryosphaeria dothidea, Sardiniella guizhouensis and Diplodia mutila, representing 20%, 14% and 12% of the total isolates, respectively. In addition, most isolates were obtained from Pistacia chinensis (14 isolates), followed by Camellia oleifera (10 isolates). The present study enhances the understanding of Botryosphaeriales species diversity on woody oil plants in Sichuan Province, China
About the Concept of the National Image
No full textВ статье рассматривается содержание понятия "имидж страны" и способы его вербализации в различных гуманитарных науках.The article analyzes the concept of the National Image and the ways of its verbalization in the humanities
Full Stokes spectralpolarimeter based on the polarization-difference interference imaging spectrometer
No full textFacial synthesis of dandelion-like g-C3N4/Ag with high performance of photocatalytic hydrogen production
No full textSimultaneous optimization of the acidified water extraction for total anthocyanin content, total phenolic content, and antioxidant activity of blue honeysuckle berries (Lonicera caerulea L.) using response surface methodology
No full textThe purpose of this study was to optimize the total anthocyanin content (TAC), total phenolic content (TPC), and antioxidant activity of acidified water extract from blue honeysuckle berries by response surface methodology (RSM). The optimized conditions were HCl concentration of 0.35%, liquid–solid ratio of 49.42 ml/g, and extraction temperature of 41.56°C for total anthocyanin content (24.01 ± 0.37 mg/g), total phenolic content (207.03 ± 3.31 mg/g), DPPH radical scavenging activity (68.24 ± 1.13%), and ABTS radical scavenging activity (70.05 ± 0.84%). The experimental results are consistent with the predicted values. The results showed that acidified water extraction was an effective, simple, and green technique for the extraction of total anthocyanins, total phenol, and antioxidant activity from blue honeysuckle berries
Hydrated mucilage reduces post-dispersal seed removal of a sand desert shrub by ants in a semiarid ecosystem
No full textPost-dispersal seed removal by animals can lead to extensive seed loss and thus is an important factor in structuring plant communities. However, we know much less about post-dispersal seed predation than about other forms of herbivory. Mucilage plays many ecological roles in adaptation of plants to diverse environments; nevertheless, until now the role of mucilage in ant-mediated seed movement remains largely hypothetical. We studied the role of mucilage in seed removal of Artemisia sphaerocephala by ants in Mu Us Sandland in Inner Mongolia, China. Messor aciculatus was the most active seed predator of Artemisia sphaerocephala. Time to first ant collecting (T (1st)) of wet intact seeds was longest and significantly different from that for dry intact seeds, wet demucilaged seeds, and dry demucilaged seeds; number of seeds removed to ant nests was lowest for wet intact seeds. After they were collected by ants, 5 % of wet intact seeds were dropped during transport. Our results indicate that seed mucilage of Artemisia sphaerocephala may play a significant role in post-dispersal seed removal by (1) making seeds less attractive to ants, thus resulting in a delay of collection time; (2) forming a strong bond to soil particles, making it difficult for ants to remove seeds; and (3) making seeds more likely to be dropped during transport, thereby allowing them to escape from predation even after collection by ants. This study demonstrates the importance of mucilage in reducing seed removal by ants and thus in anchoring seeds of desert plants in the vicinity of mother plants
Hydrated mucilage reduces post-dispersal seed removal of a sand desert shrub by ants in a semiarid ecosystem
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