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Wednesday, 20 September 2017

11 ways in which our forests are being destroyed

Author
by Santa Cruz Grows Green 
(Santa Cruz, Bolivia)


 
 
EspaƱol Worldwide, our forests cover about 31% of the Earth’s land surface. Of this, 36% are primary forests, which have taken hundreds of years to grow and cannot be replaced in our lifetime. Only about 5% of our planet’s land cover is rainforest, roughly equivalent to the size of Australia. That may seem like a lot, but our rainforests are being destroyed at the rate of over 80,000 acres (32,000 hectares) per day!
11 ways in which our forests are being destroyed


The United Nations declared 2011 International Year of Forests. Therefore, we'd like to share with you 11 ways in which our forests are being destroyed.

1. In 2008, deforestation in Bolivia advanced at a rate of 280,000 hectares per year. This means forest is being destroyed at a rate equivalent to 43 soccer fields per hour. Source.

2. Logging for tropical hardwoods, the paper industry, charcoal, and fuel wood: Little if any industrial logging of tropical forests is sustainable. The International Tropical Timber Organisation (ITTO), the body established to regulate the international trade in tropical timber, found in 1988 that the amount of sustainable logging was "on a world scale, negligible". Source.

3. Cattle ranching and grazing: To graze one steer in Amazonia takes two full acres. Rains come and wash away the thin topsoil that was previously protected by the canopy, and this barren, infertile land is vulnerable to erosion. Soon the lack of nutrients in the soil and overgrazing degrade them, and they are abandoned for newly cleared land. Source.

4. Expansion of the agricultural frontier: The World Bank says that less than ten percent of existing rainforests grow in soils good for agriculture. Huge areas of tropical soils are composed of nitrogen-poor silica, the fossil sands of ancient oceans. In other rainforests silica dissolves out of the underlying rocks, and alumina, iron oxide, and magnesia accumulate, yielding the typical tropical "laterite" soils infused with the bright reds and yellows, and, while containing adequate nitrogen, they don't have much calcium, phosphorus, or potassium. Rainforest plants draw their nutrients not from these pitiful soils, but rather from themselves - by penetrating directly into rotting logs. When the forest is cleared by peasants, torrential rains quickly leach away what nutrients there are, often creating gullied badlands. Source.

5. Human-caused forest fires: Bolivia has seen its number of fires more than triple from 2,892 to 8,841. Source. Most of these fires are not naturally occurring. They are the result of slash-and-burn clearing techniques used by farmers and ranchers to clear land for agriculture and pasturing, who lose control of the fires.

6. The illegal exotic animal trade: not all forest destruction is by deforestation. After habitat loss, animal smuggling is the biggest reason why the world's wildlife is in danger of extinction. A third of the world's wildlife is facing extinction and it is these endangered species that bring high prices on the black market in rare animals. Animal smuggling today is second only to drug smuggling as a major international illegal business. The animals are generally purchased from poor natives who, knowing nothing about the endangered status of such animals, sell them at throw-away prices. A rare toucan purchased in Bolivia for $10, for instance, is worth $1,500 in the United States. Source.

7. Colonization and trans-migration schemes: Governments and international aid agencies for a time believed that by encouraging colonisation and trans-migration schemes into rainforest areas, they could alleviate some of the poverty felt by the people of the financially poorer countries. It has since become increasingly obvious that such schemes have failed, hurting the indigenous people and the environment… The World Bank estimates that for every colonist resettled under the official transmigration project, two or more unofficially move into the forest due to the drawing effect of the program. Source.

8. Dams and hydroelectric projects: Currently five nations (Brazil, Bolivia, Colombia, Ecuador, and Peru) are planning over 146 big dams in the Amazon Basin. Some of these dams would flood pristine rainforests, others threaten indigenous people, and all would change the Amazonian ecosystem. Source.

9. Legal and illegal mining operations: Mining and industrial development lead to direct forest loss due to the clearing of land to establish projects. Indigenous people are displaced. Roads are constructed through previously inaccessible land, opening up the rainforest. Severe water, air and land pollution occurs from mining and industry. Source.

10. The oil and gas industry: Oil and gas extraction can result in direct deforestation as well as contamination of waterways and lands with oil and drilling byproducts… oil and gas development is often accompanied by road-building which provides access to previously remote areas and facilitates deforestation, colonization, and illegal logging, mining, and hunting. Source.

11. Climate change and temperature extremes: Climate change could cut premontane forests in Bolivia in half. Source. Bolivia has experienced recent fish kills in rivers due to extreme cold temperatures, in which millions of fish and other wildlife perished. Source. These are just two examples.

For further information log on website :
http://www.boliviabella.com/11-ways-in-which-our-forests-are-being-destroyed.html

Quantification of low-level genetically modified (GM) seed presence in large seed lots: a case study of GM seed in Canadian flax breeder seed lots

Author
Eric G. Lamb (a1) and Helen M. Booker (a1) 






Abstract

The detection and quantification of the prevalence of genetically modified organism (GM) contamination in seed exports is a critical element of regulatory compliance. While the procedures to reliably detect high levels of GM contamination are well understood, no comparable statistical approaches are available for the quantification of levels of GM prevalence below the established detection rate of standard tests. We present a simple statistical approach based on simulation modelling for the quantification of low levels of GM contamination. The approach can be modified to match any sampling regime and can account for rates of false positive and negative assay results. The application of this method is demonstrated using the low level of contamination in Canadian flax breeder seed lots by the GM flax variety ‘Triffid’. We show that GM contamination is likely present in seed lots at rates between two GM seeds per million and six seeds per hundred thousand. We also show that this low level of presumed contamination is indistinguishable from the number of positive tests expected from a clean seed lot given the potential rates of false positive tests.

Linked References


This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.
M.J. Crawley (2007The R BookChichester, UKJohn Wiley & Sons.
For further details log on website :
https://www.cambridge.org/core/journals/seed-science-research/article/quantification-of-lowlevel-genetically-modified-gm-seed-presence-in-large-seed-lots-a-case-study-of-gm-seed-in-canadian-flax-breeder-seed-lots/1FC5294528B4A1F78CA39CC1D36C271E

Sampling Plan and Test Protocol for the Semiquantitative Detection of Genetically Modified Canola (Brassica napus) Seed in Bulk Canola Seed

Author
National Measurement Institute, P.O. Box 385, Pymble, New South Wales, 2073 Australia
J. Agric. Food Chem.200755 (11), pp 4414–4421
DOI: 10.1021/jf070267i
Publication Date (Web): May 8, 2007
Copyright Published 2007 by the American Chemical Society

Abstract

Using a statistical approach, sampling plans for the semiquantitative detection of genetically modified (GM) canola within a bulk seed sample can be developed and tailored to meet different GM thresholds, costs, and confidence limits. This is achieved by changing the number of subsamples analyzed, the number of seeds per subsample, and the percentage of positive results allowed. These sampling plans must be devised carefully, taking into account the detection capability of the analytical assay. This is particularly important in the case of InVigor (a registered trademark of Bayer CropScience) canola, for which expression levels of the introduced protein in seed are very low. Lateral flow assays and enzyme-linked immunosorbent assays (ELISA) were both investigated for their suitability as a qualitative assay using a subsampling approach. On the basis of an ELISA, several sampling plans have been devised and validated to provide at least 99% confidence that bulk seed samples containing at least 0.9% (w/w) InVigor canola will be detected. Although the term “seed” is used throughout this paper to refer to the canola, the term “seed” is to be taken to include both seed and the canola seed (grain) that is harvested by the farmer/grower.

For further details log on website:
http://pubs.acs.org/doi/abs/10.1021/jf070267i

Preliminary study on properties evaluation of cement added gypsum board reinforced with kenaf (Hibiscus cannabinus) bast fibres

Author
  • Zakiah Ahmad
  • Wei Chen Lum
  • Seng Hua Lee
  • Rinaida Rameli
  1. 1.
  2. 2.
Original Article

Abstract

Gypsum boards had poor dimensional stability and mechanical properties compared to cement boards. To improve its properties, gypsum–cement boards reinforced with kenaf fibre bast using different gypsum/cement mixing ratios was fabricated in the current study. The results revealed that addition of cement generally improved the bending strength and compressive strength of the gypsum boards. Dimensional stability attributes, water absorption and thickness swelling, were also enhanced along with increasing cement ratio. Significant improvement was observed when 70% cement was added whereas the effects of adding 30–50% on properties improvement are not significant.

References

  1. Abdelrhman HA, Paridah MT, Shahwahid Mohd, Abdul Samad AR, Abdalla AMA (2015) The effects of pre-treatments, wood-cement ratios and partial cement substitution by gypsum on Prosopis chilensis wood. Eur J Wood Wood Prod 73:557–559CrossRefGoogle Scholar
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For further details log on website :
https://link.springer.com/article/10.1007/s13196-017-0186-x

Physical and strength properties of Bambusa striata

Author
  1. 1.
Original Article

Abstract

Strength properties of round bamboo Bambusa striata were determined under static bending and compression parallel to grain tests in air dry and green conditions taking with node and without node at centre of the test specimens from bottom, middle & top portions of the culms. The results show that strength properties i.e. fibre stress at elastic limit (FS at EL), modulus of rupture (MoR), modulus of elasticity (MoE), and maximum crushing stress (Max. CS) are always found higher in air dry than green condition. The presence of node at the centre of the specimen increases strength properties i.e. FS at EL, MoR, and MoE (except Max. CS) significantly in green condition. However difference in ‘Max. CS’ determined in presence and absence of node at the centre of the specimens is found to be statistically non –significant at 95% confidence level. The result also indicates that strength properties occurs maximum at the top and minimum at the middle portion and wall thickness minimum at top and maximum at bottom portion of the bamboo. Bambusa striata species has also been classified (strength wise) on the basis of MoE, MoR, and Max. CS in green condition and found to fall in Group-III for construction purposes.

References

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For further details log on website :
https://link.springer.com/article/10.1007/s13196-017-0194-x

Hybrid particleboard from kadam (Anthocephalus chinensis) reinforced with dhaincha (Sesbania aculeata): effects of particle mixing ratio on physical and mechanical properties

Author
  • Sourav Bagchi Ratul
  • Khandkar-Siddikur Rahman
  • Md. Abu Wabaeid Hasan
  • Md. Azharul Islam
  • Md. Nazrul Islam
  • Md. Iftekhar Shams
  1. 1.
Original ArticleFirst Online:

Abstract

This study deals with the fabrication of three layer hybrid particleboard using kadam branch (Anthocephalus chinensis (Lam.A. Rich ex Walp.) and dhaincha (Sesbania aculeata (Willd.)) as raw material with urea formaldehyde resin adhesive as 11% in the face and 9% in the core. Two types of particleboard i.e., dhaincha fine particles: face layer and kadam wood coarse particles:core layer (HB-A) and dhaincha kadam fine mix:face layer and coarse mix:core layer (HB-B) were produced by using three different mixing ratios (50:50, 60:40 and 70:30). Physical and mechanical properties of hybrid particleboards were evaluated according to the procedure of ASTM D-1037 standard. It was found that the particle mixing ratio has a significant effect on the physical and mechanical properties of hybrid particleboards. Consequently, containing lower face layer (30 wt%), the HB-A and HB-B board showed highest density (0.61 and 0.64 g/cm3, respectively) as well as MOE (2.56 and 3.56 GPa, respectively) and MOR (18.6 and 26.62 MPa, respectively) among hybrid particleboards. Presence of wood fine particles in face layer also proved effective in properties enhancement. Due to having wood fine particles content in face layer, HB-B type hybrid boards showed higher density and bending strength than HB-A boards. Presence of wood particles in face layer also reduces the WA and TS of the boards. Significant difference was examined among the properties of six particleboards during statistical analysis. The results confirmed that HB-A3 and HB-B3 particleboards met the minimum ANSI A208.1 requirements for physical and mechanical properties of M-3 grade particleboard. In decay resistance test, HB-A type particleboards showed resistance to white rot, but non-resistant for brown rot fungi where the HB-B type particleboards showed moderately resistant to both fungi. So the results indicated that the fabrication HB-B type hybrid particleboards would be technically feasible under lower face layer percentage.

References

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For further details log on website :
https://link.springer.com/article/10.1007/s13196-017-0195-9
19 September 2017

Advantages and Disadvantages of Fasting for Runners

Author BY   ANDREA CESPEDES  Food is fuel, especially for serious runners who need a lot of energy. It may seem counterintuiti...