How to increase productivity of the copepodAcartia tonsa(Dana): effects of population density and food concentration

2014 ◽  
Vol 46 (12) ◽  
pp. 2982-2990 ◽  
Author(s):  
Jianshe Zhang ◽  
Adrianna Ianora ◽  
Changwen Wu ◽  
David Pellegrini ◽  
Francesco Esposito ◽  
...  
Author(s):  
Jennifer Eugenia ◽  
Diah Anggraini

The high level of population density in DKI Jakarta affects the level of population welfare, so that it can trigger various forms of social conflict, such as crime, high unemployment, environmental damage and poverty. Johar Baru Subdistrict was chosen because it is an area that is often involved in brawls between teenagers and adults. To get around this situation, a change is needed by changing daily patterns with activities that are expected to form a positive character and can give hope to Johar Baru youth so that they can improve the quality of life. This study uses everydayness architectural methods and respond to site methods as a basis for producing creative and educational design concepts that can provide hope for Johar Baru youth so that they can have big dreams and strong motivation, become productive, open, dynamic, and creative individuals as awareness, empowerment and fostering of communities in densely populated areas in the framework of creating security, preventing brawls, strengthening brotherhood, mutual cooperation and a clean and healthy environment. So that in the future it can become a facilities for positive activities to improve character, maximize potential, and increase productivity through skills training workshops, motivational activities, and art deepening activities according to talent interests. Keywords:  brawls; population density; social interaction; youth AbstrakTingginya tingkat kepadatan penduduk di DKI Jakarta dapat memicu berbagai bentuk konflik sosial yang mempengaruhi kesejahteraan penduduk seperti tindak kriminalitas, tingkat pengangguran yang tinggi, kerusakan lingkungan serta kemiskinan. Kecamatan Johar Baru dipilih karena merupakan wilayah yang sering terlibat dalam aksi tawuran antar warga baik remaja maupun orang dewasa. Untuk menyiasati keadaan ini perlu dilakukan perubahan dengan cara mengubah pola keseharian dengan kegiatan yang dapat membentuk karakter yang positif dan dapat memberi harapan bagi remaja Johar Baru sehingga dapat meningkatkan kualitas hidup. Studi ini menggunakan metode arsitektur keseharian dan respond to site sebagai dasar untuk menghasilkan konsep perancangan wadah kreatif dan edukatif yang dapat memberikan harapan untuk remaja Johar Baru. Melalui konsep tersebut remaja Johar Baru dapat mempunyai mimpi besar dan motivasi yang kuat, menjadi pribadi yang produktif, terbuka, dinamis, dan kreatif sebagai penyadaran, pemberdayaan dan pembinaan terhadap masyarakat di kawasan padat penduduk dalam rangka menciptakan keamanan, mencegah tawuran, mempererat persaudaraan, gotong-royong serta lingkungan yang bersih dan sehat.  Wadah ini kedepannya dapat menjadi sarana kegiatan positif untuk memperbaiki karakter, memaksimalkan potensi, serta meningkatkan produktivitas melalui kegiatan workshop pelatihan keahlian, kegiatan motivasi, dan kegiatan pendalaman seni sesuai minat bakat.


Genetics ◽  
1997 ◽  
Vol 145 (3) ◽  
pp. 715-727 ◽  
Author(s):  
Richard R Zwaal ◽  
Jane E Mendel ◽  
Paul W Sternberg ◽  
Ronald H A Plasterk

Caenorhabditis elegans uses chemosensation to determine its course of development. Young larvae can arrest as dauer larvae in response to increasing population density, which they measure by a nematode-excreted pheromone, and decreasing food supply. Dauer larvae can resume development in response to a decrease in pheromone and increase in food concentration. We show here that two novel G protein alpha subunits (GPA-2 and GPA-3) show promoter activity in subsets of chemosensory neurons and are involved in the decision to form dauer larvae primarily through the response to dauer pheromone. Dominant activating mutations in these G proteins result in constitutive, pheromone-independent dauer formation, whereas inactivation results in reduced sensitivity to pheromone, and, under certain conditions, an alteration in the response to food. Interactions between gpa-2, gpa-3 and other genes controlling dauer formation suggest that these G proteins may act in parallel to regulate the neuronal decision making that precedes dauer formation.


2020 ◽  
pp. 133-158
Author(s):  
K. A. Kholodilin ◽  
Y. I. Yanzhimaeva

A relative uniformity of population distribution on the territory of the country is of importance from socio-economic and strategic perspectives. It is especially important in the case of Russia with its densely populated West and underpopulated East. This paper considers changes in population density in Russian regions, which occurred between 1897 and 2017. It explores whether there was convergence in population density and what factors influenced it. For this purpose, it uses the data both at county and regional levels, which are brought to common borders for comparability purposes. Further, the models of unconditional and conditional β-convergence are estimated, taking into account the spatial dependence. The paper concludes that the population density equalization took place in 1897-2017 at the county level and in 1926—1970 at the regional level. In addition, the population density increase is shown to be influenced not only by spatial effects, but also by political and geographical factors such as climate, number of GULAG camps, and the distance from the capital city.


Sign in / Sign up

Export Citation Format

Share Document