Sexuality in a Zero Growth Society

1977 ◽  
pp. 79-92 ◽  
Author(s):  
Alexander Comfort
Keyword(s):  
Zero Growth

Population Control for Zero Growth in Singapore.

1981 ◽  
Vol 35 (2) ◽  
pp. 334
Author(s):  
T. E. Smith ◽  
Saw Swee-Hock
Keyword(s):  
Population Control ◽  
Zero Growth

Melting and zero growth rate temperatures of syndiotactic polystryrene

2008 ◽  
Vol 286 (8-9) ◽  
pp. 983-991 ◽  
Author(s):  
A. Sorrentino ◽  
R. Pantani ◽  
G. Titomanlio
Keyword(s):  
Growth Rate ◽  
Zero Growth

A Dynamic Generalization of Zipf's Rank-Size Rule

1982 ◽  
Vol 14 (11) ◽  
pp. 1449-1467 ◽  
Author(s):  
B Roehner ◽  
K E Wiese
Keyword(s):  
Stochastic Model ◽  
Size Distribution ◽  
Urban Growth ◽  
Simple Form ◽  
Deterministic Model ◽  
City Size ◽  
Zipf’S Law ◽  
Zipf's Law ◽  
City Size Distribution ◽  
Zero Growth

A dynamic deterministic model of urban growth is proposed, which in its most simple form yields Zipf's law for city-size distribution, and in its general form may account for distributions that deviate strongly from Zipf's law. The qualitative consequences of the model are examined, and a corresponding stochastic model is introduced, which permits, in particular, the study of zero-growth situations.

Bill McKibben, Challenged: Is Zero Growth Really Necessary?

2010 ◽  
Vol 302 (4) ◽  
pp. 66-67
Author(s):  
Mark Fischetti
Keyword(s):  
Zero Growth

scholarly journals Dynamics in Copy Numbers of Five Plasmids of a DairyLactococcus lactisStrain under Dairy-Related Conditions Including Near-Zero Growth Rates

2018 ◽  
Vol 84 (11) ◽  
Author(s):  
Oscar van Mastrigt ◽  
Marcel M. A. N. Lommers ◽  
Yorick C. de Vries ◽  
Tjakko Abee ◽  
Eddy J. Smid
Keyword(s):  
Nutrient Limitation ◽  
Lactococcus Lactis ◽  
Growth Rates ◽  
Copy Number ◽  
Plasmid Copy ◽  
Content Type ◽  
Copy Numbers ◽  
Wide Range ◽  
Zero Growth ◽  
The Impact

ABSTRACTLactic acid bacteria can carry multiple plasmids affecting their performance in dairy fermentations. The expression of plasmid-borne genes and the activity of the corresponding proteins are severely affected by changes in the numbers of plasmid copies. We studied the impact of growth rate on the dynamics of plasmid copy numbers at high growth rates in chemostat cultures and down to near-zero growth rates in retentostat cultures. Five plasmids of the dairy strainLactococcus lactisFM03-V1 were selected, and these varied in size (3 to 39 kb), in replication mechanism (theta or rolling circle), and in putative (dairy-associated) functions. The copy numbers ranged from 1.5 to 40.5, and the copy number of theta-type replicating plasmids was negatively correlated to the plasmid size. Despite the extremely wide range of growth rates (0.0003 h−1to 0.6 h−1), the copy numbers of the five plasmids were stable and only slightly increased at near-zero growth rates, showing that the plasmid replication rate was strictly controlled. One low-copy-number plasmid, carrying a large exopolysaccharide gene cluster, was segregationally unstable during retentostat cultivations, reflected in a complete loss of the plasmid in one of the retentostat cultures. The copy number of the five plasmids was also hardly affected by varying the pH value, nutrient limitation, or the presence of citrate (maximum 2.2-fold), signifying the stability in copy number of the plasmids.IMPORTANCELactococcus lactisis extensively used in starter cultures for dairy fermentations. Important traits for the growth and survival ofL. lactisin dairy fermentations are encoded by genes located on plasmids, such as genes involved in lactose and citrate metabolism, protein degradation, oligopeptide uptake, and bacteriophage resistance. Because the number of plasmid copies could affect the expression of plasmid-borne genes, it is important to know the factors that influence the plasmid copy numbers. We monitored the plasmid copy numbers ofL. lactisat near-zero growth rates, characteristic for cheese ripening. Moreover, we analyzed the effects of pH, nutrient limitation, and the presence of citrate. This showed that the plasmid copy numbers were stable, giving insight into plasmid copy number dynamics in dairy fermentations.

scholarly journals 25 Years of Sustainability. A Critical Assessment

2014 ◽  
Vol 8 (1) ◽  
pp. 175-190 ◽  
Author(s):  
Alexandru-Ionuţ Petrişor ◽  
Liliana Petrişor
Keyword(s):  
Impact Assessment ◽  
Local Level ◽  
Growth Strategy ◽  
Spatial Thinking ◽  
Sustainable Communities ◽  
Strategic Impact ◽  
Underlying Causes ◽  
Zero Growth ◽  
The One ◽  
Practical Implications

Abstract25 years have passed since the 'Brundtland Report‘ defined sustainability as a possibility to equally meet current and future needs. 15 years later, the author of the definition stated that despite of the fact that the definition does not need to be changed, its understanding bettered off during the interval. 25 years later, the present paper takes an in-depth look at the concept and its practical implications. One of the issues being addressed refers to the pillars of sustainability; their number increased by 25% to include the cultural pillar in addition to the economic, social, and cultural one. Spatial thinking added a new dimension, translating into concepts like 'sustainable communities‘ or 'self standing village‘ at the local level, and 'polycentricity‘ and 'cohesion‘ at the regional one. Furthermore, practical implications include environmental impact assessment (evolving towards strategic impact assessment), internalization of externalities, ecological restoration, and a new view on conservation, different from the one addressed by the 'Zero Growth Strategy‘. In addition, the paper discusses several criticism addressed to the concept and its implementation, attempting to reveal their underlying causes. Overall, the critical analysis shows that the attempts to achieve sustainability did not change the concept as much as its understanding.

scholarly journals Zero-growth bioprocesses: A challenge for microbial production strains and bioprocess engineering

2016 ◽  
Vol 17 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Julian Lange ◽  
Ralf Takors ◽  
Bastian Blombach
Keyword(s):  
Microbial Production ◽  
Bioprocess Engineering ◽  
Zero Growth

scholarly journals Demography of feral camels in central Australia and its relevance to population control

2010 ◽  
Vol 32 (1) ◽  
pp. 11 ◽  
Author(s):  
A. R. Pople ◽  
S. R. McLeod
Keyword(s):  
Population Control ◽  
Northern Territory ◽  
Adult Survival ◽  
Large Mammals ◽  
Limited Data ◽  
Control Programs ◽  
Rate Of Increase ◽  
Zero Growth ◽  
Central Australia ◽  
Alternative Species

Since their release over 100 years ago, camels have spread across central Australia and increased in number. Increasingly, they are being seen as a pest, with observed impacts from overgrazing and damage to infrastructure such as fences. Irregular aerial surveys since 1983 and an interview-based survey in 1966 suggest that camels have been increasing at close to their maximum rate. A comparison of three models of population growth fitted to these, albeit limited, data suggests that the Northern Territory population has indeed been growing at an annual exponential rate of r = 0.074, or 8% per year, with little evidence of a density-dependent brake. A stage-structured model using life history data from a central Australian camel population suggests that this rate approximates the theoretical maximum. Elasticity analysis indicates that adult survival is by far the biggest influence on rate of increase and that a 9% reduction in survival from 96% is needed to stop the population growing. In contrast, at least 70% of mature females need to be sterilised to have a similar effect. In a benign environment, a population of large mammals such as camels is expected to grow exponentially until close to carrying capacity. This will frustrate control programs, because an ever-increasing number of animals will need to be removed for zero growth the longer that culling or harvesting effort is delayed. A population projection for 2008 suggests ~10 500 animals need to be harvested across the Northern Territory. Current harvests are well short of this. The ability of commercial harvesting to control camel populations in central Australia will depend on the value of animals, access to animals and the presence of alternative species to harvest when camels are at low density.

scholarly journals Uncultured Microbial Phyla Suggest Mechanisms for Multi-Thousand-Year Subsistence in Baltic Sea Sediments

mBio ◽  
2019 ◽  
Vol 10 (2) ◽  
Author(s):  
Jordan T. Bird ◽  
Eric D. Tague ◽  
Laura Zinke ◽  
Jenna M. Schmidt ◽  
Andrew D. Steen ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Baltic Sea ◽  
Single Cell ◽  
Marine Sediments ◽  
Niche Differentiation ◽  
Enzyme Assays ◽  
Sodium Pumps ◽  
Cellular Life ◽  
Zero Growth ◽  
Life On Earth

ABSTRACTEnergy-starved microbes in deep marine sediments subsist at near-zero growth for thousands of years, yet the mechanisms for their subsistence are unknown because no model strains have been cultivated from most of these groups. We investigated Baltic Sea sediments with single-cell genomics, metabolomics, metatranscriptomics, and enzyme assays to identify possible subsistence mechanisms employed by unculturedAtribacteria,Aminicenantes,Actinobacteriagroup OPB41,Aerophobetes,Chloroflexi,Deltaproteobacteria,Desulfatiglans,Bathyarchaeota, andEuryarchaeotamarine group II lineages. Some functions appeared to be shared by multiple lineages, such as trehalose production and NAD+-consuming deacetylation, both of which have been shown to increase cellular life spans in other organisms by stabilizing proteins and nucleic acids, respectively. Other possible subsistence mechanisms differed between lineages, possibly providing them different physiological niches. Enzyme assays and transcripts suggested thatAtribacteriaandActinobacteriagroup OPB41 catabolized sugars, whereasAminicenantesandAtribacteriacatabolized peptides. Metabolite and transcript data suggested thatAtribacteriautilized allantoin, possibly as an energetic substrate or chemical protectant, and also possessed energy-efficient sodium pumps.Atribacteriasingle-cell amplified genomes (SAGs) recruited transcripts for full pathways for the production of all 20 canonical amino acids, and the gene for amino acid exporter YddG was one of their most highly transcribed genes, suggesting that they may benefit from metabolic interdependence with other cells. Subsistence of uncultured phyla in deep subsurface sediments may occur through shared strategies of using chemical protectants for biomolecular stabilization, but also by differentiating into physiological niches and metabolic interdependencies.IMPORTANCEMuch of life on Earth exists in a very slow-growing state, with microbes from deeply buried marine sediments representing an extreme example. These environments are like natural laboratories that have run multi-thousand-year experiments that are impossible to perform in a laboratory. We borrowed some techniques that are commonly used in laboratory experiments and applied them to these natural samples to make hypotheses about how these microbes subsist for so long at low activity. We found that some methods for stabilizing proteins and nucleic acids might be used by many members of the community. We also found evidence for niche differentiation strategies, and possibly cross-feeding, suggesting that even though they are barely growing, complex ecological interactions continue to occur over ultralong timescales.

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