Modelling the growth and movement of cyanobacteria in river systems

Bloom-forming and toxin-producing cyanobacteria remain a persistent nuisance across the world. Modelling of cyanobacteria in freshwaters is an important tool for understanding their population dynamics and predicting the location and timing of the bloom events in lakes and rivers. In this article, a new deterministic model is introduced which simulates the growth and movement of cyanobacterial blooms in river systems. The model focuses on the mathematical description of the bloom formation, vertical migration and lateral transport of colonies within river environments by taking into account the four major factors that affect the cyanobacterial bloom formation in freshwaters: light, nutrients, temperature and river flow. The model consists of two sub-models: a vertical migration model with respect to growth of cyanobacteria in relation to light, nutrients and temperature; and a hydraulic model to simulate the horizontal movement of the bloom. This article presents the model algorithms and highlights some important model results. The effects of nutrient limitation, varying illumination and river flow characteristics on cyanobacterial movement are simulated. The results indicate that under high light intensities and in nutrient-rich waters colonies sink further as a result of carbohydrate accumulation in the cells. In turbulent environments, vertical migration is retarded by vertical velocity component generated by turbulent shear stress. (c) 2006 Elsevier B.V. All rights reserved.

Poverty Analysis of Ethiopian Females in the Amhara Region: Utilizing BMI as an Indicator of Poverty

This paper analyzes poverty-affected females in the Amhara region of Ethiopia. As the measurement of poverty, the paper uses body mass index (BMI) because it is one of the effective tools for measuring individual poverty level. The results of the BMI analysis show that the most poverty-affected female group is the female household heads in urban areas. The results, however, should be treated carefully considering the different social and economic structure of urban and rural areas, and the interdependent relationship between these two areas. In rural areas, access to land is the biggest issue affecting the BMI, while in urban areas, the occupation of husbands or partners is more important. These differences by area do not mean that there is no intersection between the urban and rural female groups because the majority of females in urban areas migrated from rural areas to urban areas due to various reasons such as divorce, marriage, and job opportunities.

Human Capital Investment and Poverty Reduction over Generations: A Case from the Rural Philippines, 1979-2003

This paper attempts to identify a pathway out of poverty over generations in the rural Philippines, based on long-term panel data spanning for nearly a quarter of a century. Specifically, it sequentially examines the determinants of schooling, subsequent occupational choices, and current non-farm earnings for the same individuals. We found that an initial rise in parental income, brought about by the land reform and the Green Revolution, among other things, improves the schooling of children, which later allows them to obtain remunerative non-farm jobs. These results suggest that the increased agricultural income, improved human capital through schooling and the development of non-farm sectors are the keys to reducing poverty in the long run. It must be also pointed out that the recent development of the rural non-farm sector offers ample employment opportunities for the less educated, which also significantly contributed to the poverty reduction.

物乞いするのは貧しいからか

大学3年の夏休みに物乞いをした。岩手の地方都市に帰省しており、そこから電車で1時間ほどの盛岡に用事があった。用事を済ませたら古本屋があり、そこで鳥居泰彦著『経済発展論』を見つけた。以前から欲しかった本なので、それを買うと帰りの電車賃しか残らないことを知りつつ、買った。盛岡駅に着いたら、実は所持金が電車賃に数十円足りないことがわかり愕然とした。（以下略）

Sustainable Development and Poverty Reduction under Mubarak's Program

This paper describes and analyzes the major features of economic development and poverty reduction in Egypt during its transition to a market Economy. It focuses on the changes in the situation of poverty and economic policies pursued as remedies by the government of Egypt and the ruling NDP. Sustainable development and poverty reduction is the core of the President Mubarak’s election campaign for his fifth term for the presidency. We attempt to explain the obstacles encountered by the Egyptian economy in terms of adjustments and general economic arguments on poverty. Finally, we refer to the necessity for enhanced accountability in the society to accomplish the goal.

Sustainable development goals and Japan -- sustainability overshadows poverty reduction

The Development Cooperation Charter of Japan, which took over the ODA (Official Development Assistance) Charter in February 2015, drives Japan's cooperation towards non-poor countries and non-poverty issues. The Sustainable Development Goals (SDGs) put Japan forward in these directions. As a result, in Japan the focus on global poverty reduction is overshadowed by its national interests and sustainability under the concept of universality, which was a core principle of the SDGs as differentiated from the Millennium Development Goals.

Descriptions of several new species of North American fishes.

Journ. Acad. Nat. Sci. Phila., 1818. 1. 222-235. 5 pls. 363-368. 2 pls.

Levonorgestrel intrauterine system versus medical therapy for menorrhagia

Background - Menorrhagia is a common problem, yet evidence to inform decisions about therapy is limited. In a pragmatic, multicenter, randomized trial, we compared the levonorgestrel-releasing intrauterine system (levonorgestrel-IUS) with usual medical treatment in women with menorrhagia who presented to their primary care providers. Methods - We randomly assigned 571 women with menorrhagia to treatment with levonorgestrel-IUS or usual medical treatment (tranexamic acid, mefenamic acid, combined estrogen–progestogen, or progesterone alone). The primary outcome was the patient-reported score on the Menorrhagia Multi-Attribute Scale (MMAS) (ranging from 0 to 100, with lower scores indicating greater severity), assessed over a 2-year period. Secondary outcomes included general quality-of-life and sexual-activity scores and surgical intervention. Results - MMAS scores improved from baseline to 6 months in both the levonorgestrel-IUS group and the usual-treatment group (mean increase, 32.7 and 21.4 points, respectively; P<0.001 for both comparisons). The improvements were maintained over a 2-year period but were significantly greater in the levonorgestrel-IUS group than in the usual-treatment group (mean between-group difference, 13.4 points; 95% confidence interval, 9.9 to 16.9; P<0.001). Improvements in all MMAS domains (practical difficulties, social life, family life, work and daily routine, psychological well-being, and physical health) were significantly greater in the levonorgestrel-IUS group than in the usual-treatment group, and this was also true for seven of the eight quality-of-life domains. At 2 years, more of the women were still using the levonorgestrel-IUS than were undergoing the usual medical treatment (64% vs. 38%, P<0.001). There were no significant between-group differences in the rates of surgical intervention or sexual-activity scores. There were no significant differences in serious adverse events between groups. Conclusions - In women with menorrhagia who presented to primary care providers, the levonorgestrel-IUS was more effective than usual medical treatment in reducing the effect of heavy menstrual bleeding on quality of life. (Funded by the National Institute of Health Research Health Technology Assessment Programme; ECLIPSE Controlled-Trials.com number, ISRCTN86566246.)