Resource Dynamo: A GIS model to match urban nutrient supply with agricultural demand

Various studies have observed that increased nutrient supply promotes the growth of bloom-forming cyanobacteria, but only a limited number of studies have investigated the influence of increased nutrient supply on bloom-forming cyanobacteria at the proteomic level. We investigated the cellular and proteomic responses of Microcystis aeruginosa to elevated nitrogen and phosphorus supply. Increased supply of both nutrients significantly promoted the growth of M. aeruginosa and the synthesis of chlorophyll a, protein, and microcystins. The release of microcystins and the synthesis of polysaccharides negatively correlated with the growth of M. aeruginosa under high nutrient levels. Overexpressed proteins related to photosynthesis, and amino acid synthesis, were responsible for the stimulatory effects of increased nutrient supply in M. aeruginosa. Increased nitrogen supply directly promoted cyanobacterial growth by inducing the overexpression of the cell division regulatory protein FtsZ. NtcA, that regulates gene transcription related to both nitrogen assimilation and microcystin synthesis, was overexpressed under the high nitrogen condition, which consequently induced overexpression of 2 microcystin synthetases (McyC and McyF) and promoted microcystin synthesis. Elevated nitrogen supply induced the overexpression of proteins involved in gas vesicle organization (GvpC and GvpW), which may increase the buoyancy of M. aeruginosa. Increased phosphorus level indirectly affected growth and the synthesis of cellular substances in M. aeruginosa through the mediation of differentially expressed proteins related to carbon and phosphorus metabolism. This study provides a comprehensive description of changes in the proteome of M. aeruginosa in response to an increased supply of 2 key nutrients.

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Examining the effect of the nutrient supply and tillage on the yield of maize (Zea mays L) and economic questions of cultivation on the loess-plato of Hajdúság

Cereal Research Communications ◽

10.1556/crc.34.2006.1.74 ◽

2006 ◽

Vol 34 (1) ◽

pp. 295-298

Author(s):

Dénes Sulyok ◽

Tamás Rátonyi ◽

László Huzsvai

Keyword(s):

Zea Mays ◽

Zea Mays L ◽

Nutrient Supply

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Effect of water and nutrient supply on the yield of pea varieties

Cereal Research Communications ◽

10.1556/crc.34.2006.1.142 ◽

2006 ◽

Vol 34 (1) ◽

pp. 569-572

Author(s):

M. Lesznyák ◽

Borbély Hunyadi

Keyword(s):

Nutrient Supply ◽

Effect Of Water

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Changing Places: Rock Art and Holocene Landscapes in the Wadi al-Ajal, South-West Libya

Journal of African Archaeology ◽

10.3213/2191-5784-10258 ◽

2014 ◽

Vol 12 (2) ◽

pp. 165-182 ◽

Cited By ~ 3

Author(s):

Tertia Barnett ◽

Maria Guagnin

Keyword(s):

Spatial Analysis ◽

Surface Water ◽

Rock Art ◽

Human Settlement ◽

Gis Model ◽

South West ◽

Settlement Location ◽

Central Sahara ◽

The Relationship ◽

Over Time

This article examines the relationship between rock art and landscape use by pastoral groups and early settled communities in the central Sahara from around 6000 BC to 1000 AD. During this period the region experienced significant climatic and environmental fluctuations. Using new results from a systematic survey in the Wadi al-Ajal, south-west Libya, our research combines data from over 2000 engraved rock art panels with local archaeological and palaeoenvironmental evidence within a GIS model. Spatial analysis of these data indicates a correspondence between the frequency of rock art sites and human settlement over time. However, while changes in settlement location were guided primarily by the constraints on accessibility imposed by surface water, the distribution of rock art relates to the availability of pasture and patterns of movement through the landscape. Although the reasons for these movements undoubtedly altered over time, natural routes that connected the Wadi al-Ajal and areas to the south continued to be a focus for carvings over several thousand years.

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EVALUATING THE CONTRIBUTION OF TOTAL FACTOR PRODUCTIVITY ON AGRICULTURAL GROWTH IN AN GIANG PROVINCE

Scientific Journal of Tra Vinh University ◽

10.35382/18594816.1.29.2018.30 ◽

2018 ◽

Vol 1 (29) ◽

pp. 29-37

Author(s):

Tan Van Truong

Keyword(s):

Total Factor Productivity ◽

Agricultural Production ◽

Science And Technology ◽

Agricultural Labor ◽

Factor Productivity ◽

Agricultural Growth ◽

Regression Approach ◽

Investment Capital ◽

Agricultural Demand

By the growth regression approach, the research has identified that the investment capital contributed 1,939 and agricultural labor contributed 1,291 to the agricultural growth of An Giang province. More specifically, the contribution of TFP (Total Factor Productivity) to the agricultural growth in the period 2000 - 2004 was averagely 0,11%, in 2005 - 2010 was -5,03%, and in period 2011 - 2016 was 0,81%. The total factor productivity contributed to the agricultural growth slowly. In order to raise the contribution of TFP, the research represents 05 solutions including the increase of the effectiveness of using the investment capital, the increase of the quality of labor, the application of the science and technology into agricultural production, agriculturalrestructuring, and the increase of agricultural demand.

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Physiochemical Analysis of Sandalwood (Santalum Album) Leaf Litters Degraded by Eisenia foetida and Eudrilus eugenia

International Annals of Science ◽

10.21467/ias.7.1.6-11 ◽

2019 ◽

Vol 7 (1) ◽

pp. 6-11

Author(s):

Praveesh Bhati ◽

Ritu Nagar ◽

Anurag Titov

Keyword(s):

Leaf Litter ◽

Initial Phase ◽

Nutrient Supply ◽

Ecological Sustainability ◽

Cattle Dung ◽

Agricultural System ◽

Eisenia Foetida ◽

Santalum Album ◽

Eudrilus Eugenia ◽

Set Up

The decay of leaf litter by microflora and fauna furnish nutrient supply to the soil and also uphold ecological sustainability. Applying of proper technique and exploring of result provides information for the betterment of agricultural system. Vermicomposting of Sandalwood (Santalum album) leaf litters were studied with an emphasis of physio-chemical deviation during the process and also compared with 100 % cattle dung. Obtained result explore that temperate of 50 % leaf litter (LL) and 100 % cattle dung (CD) was slightly elevated (37ºC ±1 ºC and 35ºC ±1 ºC respectively) at beginning phase and later came down to ambient level (20ºC±1 ºC). The total organic carbon (TOC) exhausted 44 % in 50 % LL Vermicomposting mixture while 70 % in 100 % CD during the process. At the final stage, TOC found more in 50% LL as compared to 100% CD. Nitrogen content was found 1.02±0.1 in 50 % LL and 0.88±0.1 in 100 % CD at the initial phase but after completion of Vermicomposting, their level was increased up to 40 to 44 %. pH was also measured during vermicomposting and found 7.2±0.1 in 50% LL while 8.4±0.1 in 100% CD at the initial phase. The at the end of process pH raised and set up to 8.2 ±0.1 in 50% LL while in 100% CD it was found 8.0 ±0.1.

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ENERGY TRANSFER EFFICIENCIES ON LOWER TROPHIC LEVELS WITH INTENSIVE OYSTER FARMING IN HIROSHIMA BAY, JAPAN

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.21610/conferencearticle_58b43169dc569 ◽

2017 ◽

Author(s):

Akira Umehara ◽

Satoshi Asaoka ◽

Naoki Fujii ◽

...

Keyword(s):

Energy Transfer ◽

Primary Production ◽

Skeletonema Costatum ◽

Warm Season ◽

Nutrient Supply ◽

Trophic Levels ◽

Phytoplankton Primary Production ◽

Mean Values ◽

Hiroshima Prefecture ◽

Study Species

In enclosed water areas, organic matters are actively produced by phytoplankton due to abundant nutrient supply from the rivers. In our study area of the semi-enclosed Hiroshima Bay, oyster farming consuming high primary production has been developed since the 1950s, and the oyster production of Hiroshima prefecture have had the largest market share (ca. 60%) in Japan. In this study, species composition of phytoplankton, primary production, and secondary production of net zooplanktons and oysters were determined seasonally at seven stations in the bay between November 2014 and August 2015. In the bay, diatoms including Skeletonema costatum dominated during the period of the study. The primary productions markedly increased during summer (August), and its mean values in the northern part of the bay (NB) and the southern part (SB) were 530 and 313 mgC/m2/d, respectively. The productions of net zooplankton and oyster increased during the warm season, and its mean values in the NB were 14 and 1.2 mgC/m2/d, and in SB were 28 and 0.9 mgC/m2/d, respectively. The energy transfer efficiencies from the primary producers to the secondary producers in the NB and SB were 2.8% and 9.1%, respectively. However, the transfer efficiency to the oysters was approximately 0.3% in the bay. This study clearly showed the spatial difference of the productions and transfer efficiencies, and the low contribution of the production of oysters in secondary productions in Hiroshima Bay.

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Detachment of biofilm bacteria due to variations in nutrient supply

Water Science & Technology ◽

10.2166/wst.1998.0624 ◽

1998 ◽

Vol 37 (4-5) ◽

pp. 211-214 ◽

Cited By ~ 17

Author(s):

Linda K. Sawyer ◽

Slawomir W. Hermanowicz

Keyword(s):

Phase Contrast ◽

Digital Image Analysis ◽

Specific Growth ◽

Nutrient Supply ◽

Surface Shear Stress ◽

Surface Shear ◽

Nutrient Limitations ◽

Contrast Microscopy ◽

Biofilm Bacteria ◽

Observable Parameter

Growth and detachment rates of an environmental isolate of Aeromonas hydrophila attached to a surface were determined under varying nutrient supply conditions in a complex medium. Growth and detachment of cells were observed in real time using phase contrast microscopy in glass parallel plate flow chambers. Surface shear stress was controlled in all experiments at 3 N m−2. Images were taken every 15 min. Digital image analysis was used to determine specific growth and detachment rates. An observable parameter proportional to the nutrient depletion at the surface due to transfer limitations was used to indicate nutrient limitations. Specific detachment rates increased as the depletion parameter increased, indicating that nutrient limitations cause this bacterium to detach at greater rates.

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