Reduce Population Growth Research Articles

Historical drivers of HCV Subtypes 1b and 3a in Thailand and 6f in Phetchabun, an HCV endemic area of the country.

The World Health Organization has set a target to eliminate viral hepatitis as a public threat by 2030. In pursuit of this goal, Thailand initiated a hepatitis C virus (HCV) microelimination project targeting Phetchabun province, a well-recognized high-burden HCV endemic area. However, the historical transmission dynamics of HCV in Phetchabun, and in Thailand in general, remain unclear. This study investigates the epidemic histories of HCV in Phetchabun, focusing on Subtypes 1b, 3a, and 6f, and their relationship with HCV in other regions of Thailand, using molecular phylogenetic analyses. Our results reveal nationwide the presence of Subtypes 1b and 3a, while Subtype 6f is mainly confined to Phetchabun. The initial spread of Subtype 1b was inferred to coincide with World War II and the period of suboptimal medical and hygienic standards in Thai blood transfusion services, suggesting a correlation between the two. The early expansion of Subtype 3a was, on the other hand, found to correlate with the epidemic of intravenous drug use in Thailand during the time of Vietnam War. The early expansion of Subtype 6f, in contrast, appears to coincide with the period of severe regional political conflict and social and economic instability. All these findings suggest the complex interplay between social determinants of health and HCV transmission. Post the mid-1990s/early 2000s, all subtypes showed significantly reduced population growth rates, aligning with improvements in blood transfusion safety standards, the nationwide "War on Drugs" policy, and enhanced accessibility to public healthcare and HCV treatments. These combined efforts likely have contributed to curbing the spread of HCV in Thailand. Nevertheless, our analyses reveal that the prevalence of HCV in Thailand remains high overall, emphasizing the need for further research and a nationwide approach to more effectively reduce the HCV burden in Thailand.

3D Chaotic Nonlinear Dynamic Population-Growing Mathematical System Modeling with Multiple Controllers

Modeling, stabilization, and identification processes are significant stages in the process of developing knowledge about chaotic dynamical systems which entail the effective prediction depending on the degree of uncertainty toleration in the forecast, accuracy of the current state to be measured as well as a time scale resting on the dynamics of the system. Control of under-activated dynamical systems has been considered substantially, and it is for periods and is currently developing in various domains such as biology, data analysis, computing systems, and so forth. Dynamic systems of growing population signifies a model describing the way a population evolves over time during which population goes through major life events, split into discrete time periods. The size of the population at a given time period is determined by the rate of growth as well as other related factors. Most progress has been made in model-based control theory, which has drawbacks when the system under consideration is exceedingly complicated, and no model can be constructed. Accordingly, a 3D-discrete and dynamic human population growth system with many controllers is proposed by examining the stability and symmetry of controller system clarifications. The symmetric stability control results are presented by considering a special parametric dynamic system in its coefficients besides suggesting periodic functional coefficients in terms of sin and cos functions. The controllers have the ability to reduce population growth rate unpredictability or enhance system stability under various external conditions. The unique and very effective strategies in relevant domains could provide a deeper understanding of their impact as well as the theoretical or technological innovations thereof. These controllers are capable of reducing population growth rate unpredictability or improving system stability under various external conditions, and applicable strategies in the relevant domains can provide profound comprehension over the impact along with the theoretical as well as technological advancements.

Effects of microplastics on reproductive characteristics and mechanisms of the marine rotifer Brachionus plicatilis

Microplastic pollution, especially secondary microplastics (MPs), poses a significant threat to marine ecosystems. Despite its prevalence, the impact of natural-aged MPs on marine organisms, hindered by collection challenges, remains poorly understood. This study focused on 1–3 μm natural-aged MPs collected from Japan's coastal sea, investigating their effects on the rotifer Brachionus plicatilis sensu stricto and its reproductive mechanisms. Rotifers exposed to varying MP concentrations (0, 20, and 200 particles/mL) over 14-day batch cultures exhibited reduced population growth and fertilization rates. Down-regulation of reproductive genes and up-regulation of oxidative stress-related genes were observed, indicating MP-induced disruptions. Enhanced activities of superoxide dismutase and acetylcholinesterase and elevated malondialdehyde levels further emphasized oxidative stress. These findings underscore the detrimental impact of MPs on rotifer reproductivity, shedding light on the underlying mechanisms.

Pink Bollworm management in cotton: Challenges, innovations, and sustainable solutions

Pink bollworm (Pectinophora gossypiella) poses a significant threat to cotton production worldwide. Despite the initial success of Bt cotton, resistance has emerged, necessitating alternative management strategies. Integrated Pest Management (IPM) approaches, including mating disruption and the sterile insect technique (SIT), offer promising solutions. The SPLAT (Specialized Pheromone and Lure Application Technology) technique utilizes wax-based formulations to disrupt pink bollworm mating behaviour, reducing population growth and damage to cotton crops. Meanwhile, SIT utilizes radiation to induce sterility in pink bollworm populations, reducing reproductive rates and mitigating infestation levels. Embracing these innovative strategies collectively ensures sustainable cotton cultivation, safeguarding farmers' livelihoods and reinforcing resilience against the persistent threat of the pink bollworm. Keywords: Pectinophora gossypiella, Cotton, IPM, SPLAT, STI

Kajian perbandingan mitigasi kerentanan fisik, ekonomi, sosial dan lingkungan akibat banjir rob di Demak

Disaster vulnerability describes the loss level due to the Rob Flood disaster in Demak Regency through the community's environmental, social, physical, and economic aspects. The research compares physical, economic, social, and environmental vulnerabilities and mitigation strategies to reduce disaster vulnerability. The research method uses a quantitative descriptive approach, strengthened by qualitative data (documents). The research results show that the highest level of vulnerability comes from social and economic vulnerability, followed by physical vulnerability. Only environmental vulnerability has the lowest value compared to the other three aspects. It shows that the Demak government's efforts to build sea walls or embankments reduce vulnerability to tidal flood disasters. Social policy mitigation strategies through reducing population growth rates, providing direct cash assistance, and providing employment opportunities for women and vulnerable groups need more attention to be improved. Economic policies that help people in the agricultural sector, such as assistance with agricultural equipment, assistance with seeds or construction of barns, and training for farmers, still need to be optimized.

The recovery of octocoral populations following periodic disturbance masks their vulnerability to persistent global change

As the major form of coral reef regime shift, stony coral to macroalgal transitions have received considerable attention. In the Caribbean, however, regime shifts in which scleractinian corals are replaced by octocoral assemblages hold potential for maintaining reef associated communities. Accordingly, forecasting the resilience of octocoral assemblages to future disturbance regimes is necessary to understand these assemblages' capacity to maintain reef biodiversity. We parameterised integral projection models quantifying the survival, growth, and recruitment of the octocorals, Antillogorgia americana, Gorgonia ventalina, and Eunicea flexuosa, in St John, US Virgin Islands, before, during, and after severe hurricane disturbance. Using these models, we forecast the density of populations of each species under varying future hurricane regimes. We demonstrate that although hurricanes reduce population growth, A. americana, G. ventalina, and E. flexuosa each display a capacity for quick recovery following storm disturbance. Despite this recovery potential, we illustrate how the population dynamics of each species correspond with a longer-term decline in their population densities. Despite their resilience to periodic physical disturbance events, ongoing global change jeopardises the future viability of octocoral assemblages.

Over-summering as a risk effect reducing population growth in a long-distance migrant shorebird

Over-summering as a risk effect reducing population growth in a long-distance migrant shorebird

Analysis of the effect of migration on reducing population growth rate fluctuations case study of Kermanshah province

Analysis of the effect of migration on reducing population growth rate fluctuations case study of Kermanshah province

Environmental bacteria increase population growth of hydra at low temperature

Multicellular organisms engage in complex ecological interactions with microorganisms, some of which are harmful to the host’s health and fitness (e.g., pathogens or toxin-producing environmental microbiota), while others are either beneficial or have a neutral impact (as seen in components of host-associated microbiota). Although environmental microorganisms are generally considered to have no significant impact on animal fitness, there is evidence suggesting that exposure to these microbes might be required for proper immune maturation and research in vertebrates has shown that developing in a sterile environment detrimentally impacts health later in life. However, it remains uncertain whether such beneficial effects of environmental microorganisms are present in invertebrates that lack an adaptive immune system. In the present study, we conducted an experiment with field-collected Hydra oligactis, a cold-adapted freshwater cnidarian. We cultured these organisms in normal and autoclaved lake water at two distinct temperatures: 8°C and 12°C. Our findings indicated that polyps maintained in sterilized lake water displayed reduced population growth that depended on temperature, such that the effect was only present on 8°C. To better understand the dynamics of microbial communities both inhabiting polyps and their surrounding environment we conducted 16S sequencing before and after treatment, analyzing samples from both the polyps and the water. As a result of culturing in autoclaved lake water, the polyps showed a slightly altered microbiota composition, with some microbial lineages showing significant reduction in abundance, while only a few displayed increased abundances. The autoclaved lake water was recolonized, likely from the surface of hydra polyps, by a complex albeit different community of bacteria, some of which (such as Pseudomonas, Flavobacteriaceae) might be pathogenic to hydra. The abundance of the intracellular symbiont Polynucleobacter was positively related to hydra population size. These findings indicate that at low temperature environmental microbiota can enhance population growth rate in hydra, suggesting that environmental microorganisms can provide benefits to animals even in the absence of an adaptive immune system.

Building and carbon emissions: Evidence from real estate purchase restriction policy

Carbon emission reduction in the building sector plays an essential role in the global mitigation effort, and a policy of limiting the expansion of buildings could be a critical intervention. Previous studies mainly focused on the process and materials in the building sector to discuss ways of building decarbonization rather than the restriction of building expansion. The Real Estate Purchase Restriction policy in China produced powerful enforcement to control the disorder expansion of building construction in China. Using the difference-in-differences model, this study finds that the policy caused approximately 5.7 million tons of carbon emissions decrease per year in the pilot cities, which could save about 52.55 million dollars social cost of carbon. Through the examination of the impact mechanism, we found that the implementation of real estate purchase restriction policy contributed to carbon emissions' reduction via reducing population growth and reducing freight volume.

Influence of sex composition of surviving children on childbearing intention among high fertility married women in stable union in Northwestern, Nigeria.

Achievement of Sustainable Development Goals (SDGs), especially goals one (end all forms of poverty), three (ensure healthy lives and promote well-being for all at all ages), four (ensure inclusive and equitable quality education and promote life-long learning opportunities for all) and five (achieve gender equality and empower all women and girls) might be a mirage without conscious efforts on the part of many developing countries to reduce population growth. Rapid population growth due to a high fertility rate and fertility desire may engender strife, poverty, unemployment, competition for scarce resources.The study explored the influence of sex composition of living children on childbearing intention among high fertility married women in stable union. This was a cross-sectional descriptive study and the study population were married women with high fertility in stable union. Results showed that sex composition of surviving children were significantly associated with respondents' fertility intentions. The following were the predictors of fertility intentions; sex composition of surviving children, type of family, contraceptive use, child parity, women empowerment status and others. Sex composition of surviving children was significantly associated with the fert ility intentions of the high fertility married women in stable union.

Impact of Fear on Searching Efficiency of Prey: A Prey–Predator Model with Weak Allee Effect

Reduced population growth at low density has important implications for conservation, colonization success, and wildlife management. In this context, the Allee effect, i.e. the positive relationship between per capita growth rate and biomass of small population density, is a crucial biological phenomenon since it is directly related to population extinction. The present paper deals with a two-species interacting model with a predator–prey relationship, where the prey population experiences the mate-finding Allee effect caused by the predator. We assume that the searching efficiency of prey individuals decreases linearly with predator density due to predation fear and investigate how predation intensity affects predator–prey dynamics. Moreover, we consider the Monod–Haldane type functional response for predator–prey interactions, which shows group defense of prey against the predator. We provide detailed mathematical analyses, including the positivity and boundedness of solutions, all biologically feasible equilibria, and their local and global stabilities. From our detailed mathematical analyses, we observe that when the carrying capacity of prey is low, at most one interior equilibrium exists, and system dynamics is simple compared to the case with high carrying capacity in which multiple coexistence equilibria may exist. We discuss three codimension-one bifurcations mathematically, e.g. Hopf bifurcation, transcritical bifurcation, saddle-node bifurcation. We notice bistability in the system when there are two interior equilibria with high carrying capacity. However, a unique attractor exists when there is only a single interior equilibrium and both populations persist. We perform extensive numerical simulations by varying two parameters simultaneously and explore how the system dynamics become complex when carrying capacity is high compared to low carrying capacity. Moreover, we discuss other important biological phenomena, e.g. the paradox of enrichment, bubbling phenomenon, etc.

Frequency‐dependent community dynamics driven by sexual interactions

AbstractResearch in community ecology has tended to focus on trophic interactions (e.g., predation, resource competition) as driving forces of community dynamics, and sexual interactions have often been overlooked. Here we discuss how sexual interactions can affect community dynamics, especially focusing on frequency‐dependent dynamics of horizontal communities (i.e., communities of competing species in a single ecological guild). By combining mechanistic and phenomenological models of competition, we place sexual reproduction into the framework of modern coexistence theory. First, we review how population dynamics of two species competing for two resources can be represented by the Lotka–Volterra competition model as well as frequency dynamics, and how niche differentiation and overlap produce negative and positive frequency‐dependence (i.e., stable coexistence and priority effect), respectively. Then, we explore two situations where sexual interactions change the frequency‐dependence in community dynamics: (1) reproductive interference, that is, negative interspecific interactions due to incomplete species recognition in mating trials, can promote positive frequency‐dependence and (2) density‐dependent intraspecific adaptation load, that is, reduced population growth rates due to adaptation to intraspecific sexual (or social) interactions, produces negative frequency‐dependence. We show how reproductive interference and density‐dependent intraspecific adaptation load can decrease and increase niche differences in the framework of modern coexistence theory, respectively. Finally, we discuss future empirical and theoretical approaches for studying how sexual interactions and related phenomena (e.g., reproductive interference, intraspecific adaptation load, and sexual dimorphism) driven by sexual selection and conflict can affect community dynamics.

Indigenous plants as Oral Herbal Contraceptive: an Updated Review

The exponential growth of the human population in a growing nation like India is one of its most serious issues. Contraceptives that are readily available and acceptable are required in many poorer countries to reduce population growth and in all countries to prevent maternal morbidity and mortality arising from unintended pregnancies. Worldwide, women consume contraceptives at a rate of about 90%. Commercially available birth control tablets are deleterious to women's health and occasionally death. Such pills can lead to fat deposition in the liver, kidneys, and uterus, a rupture of the uterus epithelial layer, irregular and unpleasant menstruation, breast cancer, and finally irreversible infertility. They can also impede metabolism and subsequent pregnancy. When considering the treatment of illnesses that often aren't treatable by allopathic medicine, the term "herbal plants" became a prevalent one that entered everyone's consciousness. Ancient physicians were cognizant of plants that may be used as contraceptives. Herbs with an anti-fertility effect include herbal contraceptives. Although less effective than pills, herbal contraceptives can be used as a less harmful option. Modern research on contraception has recently turned its attention to the study of natural herbal contraception.

Sexual Reproduction Is Not Responsible for Caragana Shrub Encroachment in Grasslands

Shrubs tended to increase their abundance as climatic aridity and grazing intensity increased in the Inner Mongolian grassland. Increasing shrub abundance was believed to be due to enhanced reproduction. However, the effects of climatic aridity and grazing on the sexual reproduction of shrubs in grassland remain largely unclear. In this study, we conducted field experiments with Caragana microphylla to examine the variation of sexual reproduction aspects (seed production, seed vigor, and sapling establishment) along a climatic aridity gradient (subhumid, semiarid, arid, and dry arid zones) and a grazing intensity gradient (fenced, mildly grazed, and severely grazed). We then quantified the population growth rate based on seed production and sapling establishment rates. Our objective was to evaluate whether sexual reproduction is the main mechanism for Caragana encroachment into grasslands. We found that climatic aridity decreased seed quantity and seed vigor but increased the sapling establishment rate of Caragana shrubs. Under ungrazed conditions, climatic aridity did not affect population growth rates, while under grazing conditions, increased aridity stresses reduced population growth rates. Grazing reduced seed production, sapling establishment, and population growth rates. Climatic aridity enhanced the negative effects of grazing on sexual reproduction, while grazing intensified the negative effects of aridity on the population growth of Caragana shrubs. In conclusion, climatic aridity, grazing, and their combined effects had negative effects on the sexual reproduction of Caragana shrubs. Therefore, sexual reproduction could not fully explain the increased abundance of shrubs with increasing aridity and grazing. Clonal reproduction might be of considerable importance for understanding the mechanism of shrub encroachment in grasslands.

Reduced male fertility of an Antarctic mite following extreme heat stress could prompt localized population declines.

Climate change is leading to substantial global thermal changes, which are particularly pronounced in polar regions. Therefore, it is important to examine the impact of heat stress on the reproduction ofpolar terrestrial arthropods, specifically, how brief extreme events may alter survival. We observed that sublethal heat stress reduces male fecundity in an Antarctic mite, yielding females that produced fewer viable eggs. Females and males collected from microhabitats with high temperatures showed a similar reduction in fertility. This impact is temporary, as indicated by recovery of male fecundity following return to cooler, stable conditions. The diminished fecundity is likely due to a drastic reduction in the expression of male-associated factors that occur in tandem with a substantial increase in the expression of heat shock proteins. Cross-mating between mites from different sites confirmed that heat-exposed populations have impaired male fertility. However, the negative impacts are transient as the effect on fertility declines with recovery time under less stressful conditions. Modeling indicated that heat stress is likely to reduce population growth and that short bouts of non-lethal heat stress could have substantial reproductive effects on local populations of Antarctic arthropods.

Education on Factors Influencing Couple of Reproductive Age in Choosing Implants Contraception At Gonting Malaha Health Center

The Family Planning (KB) program has a role in reducing the population's birth rate so that fertility and birth rates can be controlled. Regulating the spacing of pregnancies, birth spacing, and determining the number of children in a family are expected to reduce population growth. The family planning program was initiated by the government to reduce the population explosion. Many factors influence couples of childbearing age in choosing the right contraception. For example, the weight factor changes due to use, and experiencing allergies. Some of the mothers also set the time of birth. Implants are very effective but still quite low. Where the implant can be removed at any time, is not dangerous, and does not affect sexual activity. Service activities are carried out through lectures, discussions, and education methods. The number of participants in this PkM activity was 10 health workers at the Gonting Malaha Health Center. The activity begins with the provision of pretest and posttest which are presented in written form and are of course related to the material to be taught. The results of PkM activities through education show that it is the low knowledge factor that causes couples not to choose implant contraception, namely 60%. Knowledge, education, and parity factors influence couples in choosing implant contraception with a p-value less than 0.05. PkM participant post-test scores always increased after being given education with the highest increase of 25% and the lowest increase of 20%. The average increase in knowledge of all PkM participants increased to 23% when compared to the beginning. So it can be stated that this PKM activity has succeeded in educating PKM participants in knowing the factors of partners in choosing implant contraception.

Analysis of Gender Disparity in Economic Growth of Third World Economy

This article focuses on the gender gap in economic growth across the third world. It has been noted in the past that women’s labour is never viewed as being on par with men’s labour. Promoting a stronger role for women helps the economy, improves child survival and family health, and decreases reproduction, reducing population growth rates, according to global experience. In other words, egalitarianism is vital for long-term prosperity. In every country, women make up half of the population. We need to consider how women contribute to a nation’s economic development. According to the United Nations (1993), they only receive a modest percentage of chances and advantages. Women’s empowerment will directly impact economic diversification, increased productivity, and income equality, all of which will lead to other beneficial development outcomes. In this paper, emphasis has been put up on the comparative understanding of developed and developing nations. Additionally, a broad comparison is made for both nations. Some instances are also mentioned where women have contributed significantly to global economic progress.

Nexus between poverty gap and macroeconomic performance in the MENA region during the period 1990-2021

The study aims to explore the impact of some macroeconomic performance indicators on the poverty gap in the countries of the Middle East and North Africa during the period 1990-2021. The study used the econometric approach, where a correlation matrix was built between the variables under study, which is the poverty gap as a dependent variable, and several independent variables, which are the rate of inflation, the rate of population growth, the rate of economic growth, and the ratio of reserves to external debt. Applying Unit Root test, then ARDL model to investigate the effect of independent variables on the poverty gap and using E-Views 12. The study found that In the short and long term, the rate of inflation is associated with an inverse relationship with poverty rates in the countries of the Middle East and North Africa during the period 1990-2021, the increasing ratio of reserves to external debt has a negative impact on the poverty rates in the MENA countries, the increasing exports had a positive impact to decreasing poverty in MENA region, while the population growth rate is associated with a direct negative impact on the poverty gap in those countries, it has the highest influence compared to the other macroeconomic variables. And the relationship between them goes in the same direction, The study confirmed that after (1) lag period GDP growth negatively affects the poverty gap, thus with an increase in the GDP the poverty also increases, but after (2) lag periods the study confirmed the positive impact of GDP growth on the poverty gap. So the study recommends applying economic policies that reduce inflation rates by using fiscal policy tools through reducing government spending or raising tax rates. Raising export rates through an industrial policy and agriculture that supports the quality and competition of local products in global markets, as well as raising the reserve ratio to the total external debt, which may occur in the event of an improvement in export rates accordingly. It also requires population policies that reduce population growth rates. And finally, economic growth couldn’t reduce poverty without economic policies raising equality degree between individuals

The impact of selenium on insects.

Selenium, a naturally occurring metalloid, is an essential trace element for many higher organisms, including humans. Humans primarily become exposed to selenium by ingesting food products containing trace amounts of selenium compounds. Although essential in these small amounts, selenium exhibits toxic effects at higher doses. Previous studies investigating the effects on insects of order Blattodea, Coleoptera, Diptera, Ephemeroptera, Hemiptera, Hymenoptera, Lepidoptera, Odonata, and Orthoptera revealed impacts on mortality, growth, development, and behavior. Nearly every study examining selenium toxicity has shown that insects are negatively affected by exposure to selenium in their food. However, there were no clear patterns of toxicity between insect orders or similarities between insect species within families. At this time, the potential for control will need to be determined on a species-by-species basis. We suspect that the multiple modes of action, including mutation-inducing modification of important amino acids as well as impacts on microbiome composition, influence this variability. There are relatively few studies that have examined the potential effects of selenium on beneficial insects, and the results have ranged from increased predation (a strong positive effect) to toxicity resulting in reduced population growth or even the effective elimination of the natural enemies (more common negative effects). As a result, in those pest systems where selenium use is contemplated, additional research may be necessary to ascertain if selenium use is compatible with key biological control agents. This review explores selenium as a potential insecticide and possible future directions for research.