An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Culicidae; birth rate; demography; dengue; disease control; disease outbreaks; human diseases; insect vectors; landscapes; larvae; mosquito control; population dynamics; risk
Abstract:
... Recent epidemics of mosquito‐borne dengue and Zika viruses demonstrate the urgent need for effective measures to control these diseases. The best method currently available to prevent or reduce the size of outbreaks is to reduce the abundance of their mosquito vectors, but there is little consensus on which mechanisms of control are most effective, or when and where they should be implemented. Alt ...
... The coastal population of common bottlenose dolphins Tursiops truncatus found in Namibia is regionally isolated and unique. This population faces several potential anthropogenic threats, especially in Walvis Bay, including boat-based tourism, a commercial harbour undergoing expansion, and aquaculture for oysters and mussels. Between 2008 and 2012, 238 boat-based surveys were conducted, resulting i ...
birth rate; blastocyst; cryopreservation; embryo transfer; humans; in vitro culture; in vitro fertilization; pregnancy rate; women
Abstract:
... The aim of this study was to evaluate the advantages of the two-step embryo transfer (ET) strategy combining a day 2/3 ET with a day 5/6 blastocyst transfer. In an observational comparative study, 400 infertile women were enrolled from two assisted reproductive technology (ART) units according to inclusion criteria: age below 42 years and at least three embryos obtained on day 2 thus allowing an e ...
... The process of ageing of the population is one of the negative demographic phenomena of the developed countries’ population. The basic reasons are the decrease of the birth-rate and a longer lifespan of people. These trends can also be seen in the Czech Republic on the state as well as the regional levels. Our contribution wants to analyze the differences in the age of population and the rapidity ...
... Since the mid‐1970s, the western Steller sea lion (Eumetopias jubatus), inhabiting Alaskan waters from Prince William Sound west through the Aleutian Islands, has declined by over 80%. Changing oceanographic conditions, competition from fishing operations, direct human‐related mortality, and predators have been suggested as factors driving the decline, but the indirect and interactive nature of th ...
air pollution; ambient temperature; birth rate; cohort studies; models; pregnancy; premature birth; risk; China
Abstract:
... Little is known about the effect of ambient temperature on preterm birth, especially for the trimester-specific effects.To evaluate whether exposure to relatively low or high temperature during pregnancy is associated with increasing risk of preterm birth or not.We analysed the data of a birth cohort with 1,281,859 singleton pregnancies during 2013–2014 and matched the home address of each pregnan ...
Japan; analytical methods; birth rate; land use; mountains; water
Abstract:
... Non-structural measures, including relocation from a hazard zone, land development regulations, and evacuation, are important sediment-related countermeasures. Such measures depend on the behaviour of residents and are affected by socio-economic conditions. In Japan, the declining birth rate and ageing population are expected to result in rapid changes in socio-economic conditions; accordingly, th ...
... This paper analyses and compares the basic demographic characteristics of the selected districts of the Jihomoravský region, namely the urban Brno-město district, the suburban Brno-venkov district and the provincial Břeclav district, in the period between 1990–2000. The methodology section describes the indicators we have used, the basic data were taken from the database of the Czech ...
... Conservation breeding programs require active management and thus selection among various management alternatives is a common practice. As in the practice of adaptive management used in ecology, it is important to reduce uncertainty about the outcomes of various management actions. Ideally this evaluation will be done using a priori hypothesis testing, but retrospective analyses can provide import ...
... KEY MESSAGE : The Physcomitrella pseudochromosomal genome assembly revealed previously invisible synteny enabling realisation of the full potential of shared synteny as a tool for probing evolution of this plant’s MADS-box gene family. Assembly of the sequenced genome of Physcomitrella patens into 27 mega-scaffolds (pseudochromosomes) has confirmed the major predictions of our earlier model of exp ...
Daphnia; biomass; birth rate; chlorophyll; community structure; euphotic zone; fish; lakes; mortality; population dynamics; zooplankton; Japan
Abstract:
... The biomass and population dynamics of crustacean zooplankton were determined in oligotrophic Lake Toya in Japan over 5 years from May 1992 to May 1997. In 1992 and 1993, zooplankton biomass was up to 4.3 g dry weight m⁻², whereas it decreased to <1 g dry weight m⁻² after 1994. This extreme change in biomass was associated with the succession of dominant species from larger ones, such as Daphnia l ...
birth rate; breeding; bucks; farmers; farming systems; flocks; goat milk; goats; interviews; milk yield; mortality; production technology; questionnaires; rural areas; slaughter; surveys; tick-borne diseases; twins; villages; South Africa
Abstract:
... A survey of small-scale goat farmers was conducted in two villages of the Nkonkobe region, in the central Eastern Cape. The aim of the study was to assess and document the prevailing goat production systems in the rural areas. Information obtained was mainly on flock sizes, reasons for keeping, breeding and management practices. A structured questionnaire, based on interviews of 52 respondents rev ...
birth rate; dynamic models; evolution; genetics; infection; influenza; mortality; public health; China
Abstract:
... Influenza is a worldwide public health problem which causes a serious economic and health burden. In order to provide a scientific basis for improving the prevention and control level of influenza, using dynamic model to evaluate the infection rates of influenza different subtypes from 2010 to 2019 in China. This article established SEIABR model based on influenza cases reported by China National ...
birth rate; capital; education; health services; models; pediatrics; pollution; public health; regression analysis; research; urbanization; China
Abstract:
... Pediatrics is an integral part of public health services. With the impact of the epidemic and the high-quality transformation of China’s development, the contradiction in the supply of pediatric public services has become more prominent. Scientific evaluation of the efficiency and quality of pediatric services, clarifying the redundancy of pediatric input resources and adjusting the construction o ...
... Recent advances in molecular microbiology have enabled refined studies of the genital tract microbiota. This constitutes the basis of the present updated systematic review and meta-analysis which investigate vaginal dysbiosis (VD) as defined by either microscopy (e.g., Nugent score for bacterial vaginosis) or molecular methods (qPCR and Next Generation Sequencing) to evaluate the impact of VD on t ...
air; air pollution; birth rate; blood serum; cohort studies; embryo transfer; environment; freeze-thaw cycles; hospitals; issues and policy; oocytes; pregnancy rate; regression analysis; risk; China
Abstract:
... The effects of ambient air pollutants on adverse pregnancy outcomes have been reported. However, studies about air pollutants exposure and pregnancy outcomes in patients undergoing IVF were limited and inconclusive. To date Shanghai has been the only city in China to implement a compulsory single embryo transfer policy for all patients undergoing their first embryo transfer procedure effective fro ...
abortion (animals); assisted reproductive technologies; birth rate; body mass index; dose response; meta-analysis; obesity; pregnancy rate; relative risk; systematic review
Abstract:
... This systematic review investigated dose–response relationship between maternal prepregnancy body mass index (BMI) and pregnancy outcomes following assisted reproductive technology, including clinical pregnancy rate (CPR), miscarriage rate (MR), and live birth rate (LBR). We searched four major databases and finally included 105 studies involving more than 271,632 pregnant women. We performed line ...
Bayesian theory; anti-Mullerian hormone; birth rate; blastocyst; blood serum; body mass index; follicular fluid; gas chromatography; hospitals; liquid chromatography; pollution; polychlorinated biphenyls; pregnancy rate; tandem mass spectrometry; France
Abstract:
... The impact of persistent organic pollutants (POPs) on reproductive health is still poorly understood, even though infertility management has high associated societal and economical costs. The aims of this study were to characterize the internal levels of polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs) and perfluoroalkylated substances (PFAS) in women undergoing in vitro fertiliz ...
birth rate; death; dentists; mortality; nurses; physicians; regression analysis; rural areas; rural health; screening; United States
Abstract:
... PURPOSE: To explore the relationship between provider‐to‐population ratios, rurality and population health in the United States using counties as the unit of analysis. METHOD: Population ratios for registered nurses (RNs), primary care physicians, and dentists were included in multivariable regression analyses. Population health indices assessed were premature death rate, self‐rated health, teen b ...
... In this paper we revisit the classic Lotka–Volterra model of competition between two populations and present some new results on the regime of bistability presented by this model. Initially, we review the results on the global stability analysis of the system and present a new global energy function. Then, we extend the model analysis in the case of strong competition, when the system has two asym ...