High Population Levels Research Articles

Transient Dynamics in Fast–Slow Predator–Prey Model with Monod–Haldane Functional Response and Asymptotic Behaviors

This paper studies the transient dynamics in a fast–slow ecological model with a Monod–Haldane functional response. Geometric singular perturbation theory is utilized to examine the transient dynamics generated by intrinsic multiple time scales. An asymptotic series solution is derived for the normally hyperbolic sub-manifold in the slow flow. The paper proves the existence of relaxation oscillations near fold points and the existence of a smooth family of canard cycles arising from folded singularities. Furthermore, it investigates the resulting canard explosion and transient dynamics numerically. By incorporating the Monod–Haldane functional response, which represents the inhibitory effect on predation at high prey population levels, this study illustrates the occurrence of transient dynamics under this mechanism.

Derivation and dynamics of discrete population models with distributed delay in reproduction

We introduce a class of discrete single species models with distributed delay in the reproductive process and a cohort dependent survival function that accounts for survival pressure during that delay period. These delay recurrences track the mature population for species in which individuals reach maturity after at least τ and at most τ+τM breeding cycles. Under realistic model assumptions, we prove the existence of a critical delay threshold, τ˜c. For given delay kernel length τM, if each individual takes at least τ˜c time units to reach maturity, then the population is predicted to go extinct. We show that the positive equilibrium is decreasing in both τ and τM. In the case of a constant reproductive rate, we provide an equation to determine τ˜c for fixed τM, and similarly, provide a lower bound on the kernel length, τ˜M for fixed τ such that the population goes extinct if τM≥τ˜M. We compare these critical thresholds for different maturation distributions and show that if all else is the same, to avoid extinction it is best if all individuals in the population have the shortest delay possible. We apply the model derivation to a Beverton–Holt model and discuss its global dynamics. For this model with kernels that share the same mean delay, we show that populations with the largest variance in the time required to reach maturity have higher population levels and lower chances of extinction.

Effectiveness of Hydrilla verticillata (L.F.) Royle as a phytoremediation agent in Kaligarang River raw water

The main source of pollutants is the impact of domestic (household waste), which pile up due to high population levels. The accumulation of domestic waste produces wastewater containing heavy metals, including iron (Fe), which is then absorbed into the ground and flows into rivers. Phytoremediation is a method that can remove, absorb, destroy, and degrade pollutants, including heavy metals, in water. Hydrilla verticillata (L.f.) Royle has become a plant known as a good phytoremediator agent. This research aims to determine morphological changes and the effect of phytoremediation Hydrilla verticillata (L.f.) Royle will remediate the water of the Kaligarang River with an exposure time of 5 and 10 days. The testing of iron level (Fe) is done using analysis with atomic absorption spectroscopy (AAS). The results obtained were that the iron (Fe) content was originally 1.2222 mg/L, decreased as much as 0.9539 mg/L in treatment S1 with an average value of 0.1683 mg/L, and in treatment S2 decreased to 0.3557 mg/L with an average value of 0.766.

Network power and exclusion of informal waste pickers when plastic flows change: A case study of community waste banks in Klaten Municipality in Indonesia

Countries, like Indonesia, without advanced waste management systems and with higher levels of population and consumption growth, face particular challenges in addressing plastic waste and marine pollution. To address and prevent plastic marine pollution, Indonesia introduced mitigation initiatives, such as Extended Producer Responsibility, waste banks, and take back schemes. While recent research shows such approaches are able to prevent marine litter, research into their social and equity effects is scarce. This is problematic, because mitigation initiatives can have in- and exclusion effects in terms of access to valuable waste for vulnerable, informal waste actors. This article combines the sociology of network and flows with a network power typology to study how the implementation of waste banks in Klaten Municipality, Indonesia not only led to reduction in plastic pollution, but also the exclusion of cartmen, waste pickers and mobile intermediates from waste networks and thus from accessing these valuable waste flows. A waste bank is a community based business that provides households with additional income and turns household waste into economically valuable materials by trading them with recyclers. In doing so they outcompete a vulnerable group like waste pickers. Instead of waste pickers, households become part of the plastic waste networks. In addition to assessing environmental effects of (marine) plastic pollution mitigation initiatives, more scholarly attention should go towards assessing the in- and exclusion dynamics around different plastic mitigation initiatives. The sociology of network and flows is a useful lens through which to examine these in- an exclusion effects.

Rhythm of Exposure in Town Centres: A Case Study of Lancaster City Centre

This study proposes a novel air pollution exposure index (APEI) metric, drawing from traditional elements in rhythmanalysis and public-life studies to help understand how people are exposed to air pollution in their urban environment and when the risks are greatest. It expands on the notion of rhythm as a socially constructed natural phenomenon connected to urban life and spaces. Air quality monitoring data, as well as bus times and in situ traffic and pedestrian counts, from Cable Street and Dalton Square in Lancaster were applied to define the APEI, which combines an air pollution index (NO2 and PM10), a surrogate for ambient air pollution level, with a population index, a surrogate for population flow. The index values were subsequently ranked in numeric order, i.e., a higher ranking shows increased exposure risk and vice versa, to determine total exposure on an individual level. This metric proves valuable in defining air pollution exposure status and recognizing factors associated with high pollution and population levels. Similarly, by comparing APEI values, one could evaluate exposure levels in different locations and seasons to verify when the APEI has increased at a given location and the different rhythms and flows responsible for an individual’s exposure. Hence, it has potential use for urban planners and the city council’s policymakers who are involved in Lancaster Air Quality Management.

Polygamy in Mormonism: History, Conflicting Doctrines, and Contemporary Perspectives

Polygamy is considered the most sacred and crucial doctrine in Mormon belief, revealed to the founding prophet of Mormonism for dissemination to humanity on Earth. In practice, polygamy has reached remarkably high levels, sparking controversy since the 18th century and engendering conflicts between the Mormon Church and the governments of the regions where they reside, causing disadvantages for Mormon followers settled in those areas. This article provides a detailed examination of the practice of polygamy within the Mormon Christian doctrine, deemed the most sacred tenet in their faith. Employing a qualitative approach, the research analyzes literature using a historical method to explore the history of polygamy in Mormon teachings. Additionally, an in-depth analysis is conducted to comprehend the definition, legal basis, conditions, and purposes of polygamous practices within the Mormon community. The research findings indicate a high population level of polygamous practices in the early 18th century, where one man could have dozens of wives. Despite being prohibited in the 19th century, Mormon adherents vehemently maintain this practice. Based on analyses from various sources, this research discovers that polygamy within the Mormon community is regarded as the highest form of marriage. This is due to the overarching goal of Mormon beliefs: to establish the Kingdom of God on Earth. The more polygamous practices, the more individuals born, seen as a contribution to fulfilling the Kingdom of God. The primary principle for engaging in polygamy is to have as many wives as possible, with the aim of liberating unborn spirits.

The Impact of Food Security on Economic Growth through Interaction with Poverty Levels

Food security has a significant impact on economic aspects, poverty levels, and the quality of human resources in a region. Food security issues are something that must be watched out by the East Java Provincial government. The high population and poverty level can cause problems in economic growth in East Java Province. The purpose of the study is to determine how the poverty level can strengthen or weaken the relationship between economic growth and food security as measured from the Food Availability Index, Food Affordability Index, and Food Utilization Index. This research is important because food security not only talks about food consumption for the community but also how food availability, affordability, and utilization can be the basis of sustainable development. The data used are secondary data from the Central Bureau of Statistics of East Java Province and the Indonesian National Food Agency. This research was conducted with a quantitative approach using Moderation Regression Analysis (MRA) method on panel data. The results showed that partially the poverty level can strengthen the influence of the Food Availability Index and Food Utilization Index on economic growth. In this case, the poverty level is classified as quasi-moderation which has a dual role as a moderation variable and an independent variable directly affects economic growth. Meanwhile, the effect of the Food Affordability Index on economic growth is not moderated by the poverty level as a predictor of moderation.

Uncovering glacial footprints and identifying phylogeographic units in the freshwater crab Potamon elbursi Pretzmann, 1962 (Decapoda: Potamidae) based on mitochondrial data

The current patterns of biodiversity have significantly been affected by glacial-interglacial cycles during the Pleistocene period. True freshwater crabs are considered as poor dispersers and terrestrial barriers restrict gene flow between their local populations. Recent studies, however, suggest that certain environmental conditions, such as periods of heavy rainfall and humidity, can facilitate their between-drainage dispersal and will result in the evolution of homogenous genetic patterns among different drainage systems. Here we tested this hypothesis by comparing populations of the endemic freshwater crab Potamon elbursi Pretzmann, 1962 distributed in two drainage systems, the Caspian Sea and Namak Lake, in northern Iran. Our results based on the genetic analysis of 70 new and 61 previously published sequences of the mitochondrial cytochrome oxidase subunit I gene revealed a substantial haplotype diversity in some populations and high levels of local population structuring in others. Initially, we found mixed evidence of genetic differentiation and connectivity among drainages and populations. Genetic differentiation between the two drainages only became apparent after the Sepirdood population (which belongs to the Caspian Sea drainage) was excluded. Subsequently, the two drainages showed significant genetic distinctions, with a limited gene flow between them. Our demographic analyses supported recent population bottlenecks, followed by a rapid demographic and/or spatial expansion dating back to the Pleistocene climatic fluctuations. Species distribution modelling suggests that precipitation during warm weather conditions profoundly affects the distribution of P. elbursi. This study indicates that freshwater crabs can override short land barriers under favorable weather conditions and will have conservation implications in the face of contemporary climatic fluctuations.

Development and biochemical profile of Zingiber officinale under different population densities of Meloidogyne javanica

Ginger is a medicinal plant known for its aromatic, antioxidant, and pharmacological properties. This study aimed to examine the vegetative growth and biochemical profile of ginger exposed to Meloidogyne javanica at different initial inoculum levels. The experiment was conducted in a greenhouse using a completely randomized design. Treatments comprised 0, 2000, 4000, 6000, 8000, and 10,000 eggs of M. javanica and eight replications per treatment. At 70 days after inoculation, plants were harvested and evaluated for nematode parameters, vegetative growth, total phenolic compounds, gingerol content, antioxidant activity, and soluble sugars content. Total nematode number increased linearly as a function of initial inoculum level. The reproduction factor was greater than one (RF>1) in all treatments. Vegetative development, however, was not affected. The highest concentrations of total phenolics and gingerol were estimated to occur with initial inoculum levels of 4500 and 4000 eggs, respectively. Higher population levels (>6000 eggs) stimulated the production of soluble sugars in ginger rhizomes. Although increasing levels of M. javanica did not affect ginger vegetative development, it significantly altered biochemical parameters, such as total phenolic compounds, gingerol content, antioxidant activity, and soluble sugars content, proving that M. javanica influences the quality of ginger.

Kualitas Pelayanan Pembuatan Akta Kelahiran di Dinas Kependudukan dan Pencatatan Sipil Kota Surabaya

The background of this research is that one of the development steps in Indonesia is the high population level. This study aims to improve the quality of public services, especially at the Surabaya City Population and Population Registration Office for birth certificate services. The method used is the type of research used in this research is quantitative research using survey methods. Results and discussion Overall the quality of service at the Surabaya City Population and Civil Registration Office shows that the difference or gap between customer expectations and employee performance has an average total that is at the medium classification level or the quality of service at the Surabaya City Population and Civil Registration Service is quite good. This means that customer satisfaction in terms of the quality of services provided at the Department of Population and Civil Registration of the City of Surabaya is quite good.

Colonization and population dynamics of total, viable, and culturable cells of two biological control strains applied to apricot, peach, and grapevine crops.

The ecological fitness of the biological control strains Bacillus velezensis A17 and Lactiplantibacillus plantarum PM411 was evaluated in different crops, geographical zones, and growing seasons. Both strains (2 g L-1 of dried formulation) were spray-inoculated on apricot trees, peach trees, and grapevines. Depending on the crop, flowers, fruits, and leaves were picked at several sampling time points. The population dynamics of viable, viable but non-culturable, and dead cells were studied by comparing viability qPCR (v-qPCR), qPCR, and plate counting estimations. A17 showed high survival rates in apricot, peach, and grapevine organs. The A17 viability was confirmed since qPCR and v-qPCR estimations did not significantly differ and were rather constant after field applications. However, higher population levels were estimated by plate counting due to the non-selective characteristics of the medium used. The viability of PM411 was constrained by plant organ, crop, and climate conditions, being higher in apricot than in grapevine. PM411 survival declined after field application, indicating difficulties in its establishment. The PM411 population level was made up of dead, culturable, and viable but non-culturable cells since significant differences between the three methods were observed. In conclusion, A17 and PM411 differ strongly in their survival in grapevine, peach, and apricot.

Promotion of cooperation in evolutionary snowdrift game with heterogeneous memories

Cooperative behavior is one of main concerns in evolutionary game researches. Since memory generally plays important roles when updating strategies, many memory-based mechanisms have been proposed to promote evolution cooperation and assumed that all players have identical memory capacity. To be more realistic, a heterogeneous memory mechanism is proposed for snowdrift game in the present paper, whose core lies in: (i) The whole population is divided into two groups and each group is endowed with different memory. (ii) When updating strategies, both adopted frequency within memory interval and the payoff performance of reference strategy are taken into account. Simulation results show that the proposed mechanism results in very high cooperation levels of heterogeneous population in a wide range of the ratio r, and that the strategy updating rule can also significantly facilitate cooperation of homogeneous population. Moreover, the new mechanism reveals a “heterogeneity superiority” phenomenon, that is, the cooperation level of heterogeneous population is usually higher than the weighted sum of those of two corresponding homogeneous populations. Therefore, the proposed mechanism may have potential applications to social management.

A population modification gene drive targeting both Saglin and Lipophorin impairs Plasmodium transmission in Anopheles mosquitoes.

Lipophorin is an essential, highly expressed lipid transport protein that is secreted and circulates in insect hemolymph. We hijacked the Anopheles coluzzii Lipophorin gene to make it co-express a single-chain version of antibody 2A10, which binds sporozoites of the malaria parasite Plasmodium falciparum. The resulting transgenic mosquitoes show a markedly decreased ability to transmit Plasmodium berghei expressing the P. falciparum circumsporozoite protein to mice. To force the spread of this antimalarial transgene in a mosquito population, we designed and tested several CRISPR/Cas9-based gene drives. One of these is installed in, and disrupts, the pro-parasitic gene Saglin and also cleaves wild-type Lipophorin, causing the anti-malarial modified Lipophorin version to replace the wild type and hitch-hike together with the Saglin drive. Although generating drive-resistant alleles and showing instability in its gRNA-encoding multiplex array, the Saglin-based gene drive reached high levels in caged mosquito populations and efficiently promoted the simultaneous spread of the antimalarial Lipophorin::Sc2A10 allele. This combination is expected to decrease parasite transmission via two different mechanisms. This work contributes to the design of novel strategies to spread antimalarial transgenes in mosquitoes, and illustrates some expected and unexpected outcomes encountered when establishing a population modification gene drive.

Observation scale of space value for measuring successful shopping malls, a case study in Indonesia

ABSTRACT Establishing the value of retail space is the key to the success of shopping malls. The research in this field attracts attention, where the rented spaces have the same value to create the highest profit for tenants and shopping mall owners while providing convenience for visitors. The aim of this research is to verify the factors that form space value using scoring techniques on shopping malls in Indonesia. This research method uses triangulation with sequential and simultaneous approaches. Qualitative uses observational case studies followed by quantitative through assessment scales confirmed by expert practitioners shopping mall development. Jakarta and Surabaya were chosen as research areas with the highest population levels and the most shopping malls in Indonesia. The results show that three factors form space value: spatial layout, accessibility of space, and visitor visibility. Shopping malls in Indonesia are more dominated by one of the space value factors, while other factors are not so highlighted. These findings produce a scoring technique that can be used as an evaluation tool for implementing space value in shopping malls and pave the way for researchers interested in the retail property sector regarding strategic retail space planning, especially shopping mall development in developing countries.

Observed Equity and Driving Factors of Automated External Defibrillators: A Case Study Using WeChat Applet Data

Out-of-hospital cardiac arrest (OHCA) causes a high mortality rate each year, which is a threat to human well-being and health. An automated external defibrillator (AED) is an effective device for heart attack-related diseases and is a panacea to save OHCA. Most relevant literature focuses on the spatial distribution, accessibility, and configuration optimization of AED devices, which all belong to the characteristics of the spatial distribution of AED devices. Still, there is a lack of discussion on related potential influencing factors. In addition, analysis of AED facilities involving multiple city comparisons is less considered. In this study, data on AED facilities in two major cities in China were obtained through the WeChat applet. Then, the AED equity at the city and block scales and its socioeconomic factors were analyzed using the Gini coefficient, Lorenz curve, and optimal parameters-based geo-graphical detector (OPGD) model. Results show that the number of AEDs in Shenzhen was about eight-times that of in Guangzhou. The distribution of AEDs in Shenzhen was more equitable with a global Gini of 0.347, higher than that in Guangzhou with a global Gini of 0.504. As for the determinants of AED equity, residential density was the most significant determinant in both Guangzhou and Shenzhen from the perspective of individual effects on AED equity. Differently, due to the aging population in Guangzhou, the proportion of the elderly in blocks was influential to local AED equity. The local economic development level was crucial to local AED equity in Shenzhen. The results of the interaction detector model illustrate that relatively equitable AED distributions were found in the high-density residential areas with a balance of employment and housing, high-aging residential areas, and high-mobility residential areas in Guangzhou. The area with a high level of local economic development, dense population, and large mobility was the area with a relatively equitable distribution of AEDs in Shenzhen. The results of this paper are conducive to understanding the equity of AEDs and its socio-economic determinants, providing scientific reference for the optimization and management of AEDs.

Mapping of Carbon Dioxide (Co2) Emissions Due To Increased Vehicle Volume in Mataram City

The high level of population and activities in the city of Mataram also increases the use of vehicles as a secondary need for the community to help with daily activities in land transportation. As the use of vehicles increases, the demand for fuel oil (BBM) also increases. Fuel is a material that can be converted into energy by burning fuel where the fuel contains heat energy that can be released and manipulated. Vehicle emissions are a major source of pollution in big cities in Indonesia. CO2 is a compound consisting of the elements carbon and oxygen with the writing CO2. Carbon dioxide is a gaseous element that exists at atmospheric temperature and pressure. The hope for this research is to determine CO2 levels in the city of Mataram and prevent CO2 emissions from increasing. The results of calculating the highest vehicle volume are located in segment III Jalan Majapahit of 3506 pcu/hour which occurs at 17:00 - 17:15 WITA. The results of the regression analysis between vehicle volume as the X variable and CO2 gas emissions as the Y variable on the five road segments conducted by the study were y = 134.57 ln(x) - 970.14 with an R2 value of 0.8661 included in the 0.80 interval – 1,000 which means that the strength of the relationship between vehicle volume and CO2 emissions has a very strong relationship and vehicle volume contributes 86.6165% to CO2 emissions. Based on the results of the discussion that was carried out, the CO2 gas emission levels in all road segments carried out had an average CO2 gas emission level value of 103.31 – 108.56 kg/hour.

MARKET CONDUCT ANALYSIS OF SALAK PONDOH COMMODIETIES (Salacca edulis reinwardt) SOLD IN TRADITIONAL MARKET

Salak pondoh has profitable agribusiness opportunities. The high level of population and tourists in Bogor City gave rise to many modern markets and traditional markets that provide fruits including pondoh salak. However, the characteristics of salak fruit that are easily damaged often in the process of distributing goods from producers to consumers there is an activity that triggers uncertainty. The quantity of actors involved in the marketing process can affect the marketing behavior of each marketing actor, so the research objective is to analyze market behavior by studying the process of price formation, the marketing chain, and the marketing function. The location selection was carried out purposively, namely Bogor Market and Jambu Dua Market which are markets that are mostly visited by the people of Bogor. The total number of respondents was 32 people consisting of 6 retailers, 5 collectors, and 21 farmers. The behavior of the pondoh salak market was analyzed using qualitative methods, namely the analysis of pricing practices, selling and buying practices of products from each marketer. Pricing at the farm level is determined by the next marketing agency, namely collecting traders, while at the trader level, pricing is carried out independently based on price information from the market. There is one marketing channel that is formed, namely farmers who sell to village collectors, village collectors sell to wholesalers, namely the Kramat Jati Market, wholesalers sell to Bogor City retailers and then sell to final consumers.

Abstract P145: Sodium Potassium Ratio And Blood Pressure Levels In Adults

Background/Objectives: To assess the association between Sodium-potassium ratio and blood pressure levels in adults. Subjects/Methods: In 396 randomly distributed residences, we carried out cross-sectional measurements on participants adults from Vitória, a southeastern city in Brazil. Anthropometry, blood pressure, and fasting blood were measured on the same day by trained personnel at the University research clinic. The blood pressure mean was calculated from 2 measurements after 5 minutes of rest. The Na/K ratio was calculated from the 24-hour urine collection carried out after participants received the instructions (the first collection in a plastic cup (0.7 L), then transferring the content to the storage bottle (2 L), and keeping it in the refrigerator). We considered valid 24-hour urine collections for those with collection times between 23 and 25 hours, no report of urine loss, and volume >500 mL. A questionnaire was applied for sociodemographic variables. We performed ANOVA to compare variances across the Na/K tertile means and blood pressure and crude and adjusted linear regressions to assess the associations. Statistical significance was established in p < 0.05. Results: From 272 remaining participants with valid 24-hour urine, Na, K, and blood pressure data, 54% were girls, with a mean age of 44 ± 14 years old balance between age groups and no difference (p > 0.05) between genders. A significant increase in Systolic 1.53 (CI 95%: 0.26 -2.80) and Diastolic 1.27 (CI 95%: 0.54 -2.00) blood pressure was related to the Na/K ratio increase, even after adjusting for sex, BMI, and skin color. Conclusions: The sodium-potassium ratio is associated with blood pressure levels increment. These findings suggest the importance of dietary interventions to promote a balanced Na/K ratio, which may contribute to preventing and managing high blood pressure levels in adult populations.

Ultraviolet-C irradiation has no short-term, direct effects on cyclamen mite (Phytonemus pallidus (Banks)) in strawberry

Cyclamen mite is a nearly global pest of strawberry, inhabiting concealed spaces within folded leaves and flower buds emerging from plant crowns. It feeds on new plant tissue causing leaf discoloration and deformation, stunted plants, fruit bronzing and cracking, and yield losses at high population levels. Because ultraviolet-C (UV-C) irradiation is a promising new tool for disease and pest management in strawberry, and because there are few control options for cyclamen mite, we tested the direct, short-term effects of UV-C on cyclamen mite populations in potted strawberry plants in a controlled environment. Results from three experiments showed few differences in cyclamen mite populations on controls versus plants treated with UV-C (0.237 W m−1) for 3 or 4 weeks. In the second experiment, using a different strawberry cultivar and directing the UV-C from above the plant crown only, there was indication of a mild effect that may be due to some direct mortality and/or indirectly to plant defenses. However, longer-term studies will need to be conducted to determine whether pre-infestation exposure to UV-C can enable strawberry plants to better resist or tolerate cyclamen mite populations. Direct mortality did not occur as in previous experiments with pests, like twospotted spider mite, that live primarily on opened leaves.

Makanan Halal Pada Street Food: Halal Awareness, Halal Knowledge, Label Halal Terhadap Keputusan Pembelian (Studi Kasus Di Kota Malang)

Currently, the need for halal products has increased, from the fields of medicine, fashion, halal food, halal cosmetics, Islamic finance to Muslim-friendly tourism. Indonesia is ranked first in the world in consuming halal food in 2019. The high level of Muslim population triggers a high demand for halal food. As a Muslim, sometimes consuming food is not too thorough to see whether a product is halal for consumption or not. The purpose of this study was to determine the effect of halal awareness, halal knowledge, prices on purchasing decisions for halal food at street food. The sample used was 100 samples with the criteria of having bought food at street food. Why is research important, because with the emergence of the new halal label issued by BPJPH, the public will be even more selective in the process of choosing halal food, indeed a lot of research on halal has been carried out, but research focusing in the object under study is different. The research method used is quantitative with technical analysis of SEM-PLS data using SmartPLS software. The result showed that halal awareness (X1), halal knowledge (X2) and halal label (X3) had an influence on the purchasing decision (Y) of halal food on street food.