A Critical Analysis of Forest Policies of Pakistan: Implications for Sustainable Livelihoods

Pakistan has very low forest cover, but these forests are very diverse in nature and of significant importance for the livelihood security of millions of rural people who live in and around these forests. Policies, institutions and processes form the context within which individuals and households construct and adapt livelihood strategies, on the other hand these institutionally shaped livelihood strategies may have an impact on the sustainability of natural resource use. The present paper aims to critically analyse the forest policies of Pakistan. Implications for sustainable forest management and livelihood security of forest dependent people are also given. The first forest policy of Pakistan was announced in 1955 followed by the forest policies of 1962, 1975, 1980, 1988 as part of the National Agricultural Policy, 1991, and the latest in 2001. Most of the forest policies were associated with the change of government. There was much rhetoric in some recent policies regarding the concept of “participation” and “sustainable livelihoods” but in practice these policies are also replica of the previously top-down, autocratic and non-participatory forest policies. Pakistan needs to develop a sustainable, workable, research-based, and people-friendly forest policy enable to catering to the changing needs of stakeholders including government.     

Polypropylene/poly (butylene terephthalate) melt spun alloy fibers dyeable with carrier-free exhaust dyeing as an environmentally friendlier process

Carrier agent as one of the synthetic persistent molecules present in textile effluents considered as one of the most highly toxic, carcinogenic and serious inhibitor of the microbial respirometric activity. This chemical is used as accelerants in the dyeing or printing the hydrophobic fibers by dispersed dyes. Hydrophobic polypropylene (PP) fibers cannot be dyed by conventional dyeing process due to the absence of dye sites in the molecular chain and their high crystallinity. This study presents a carrier-free exhaust dyeing as an environmentally friendlier and cleaner process. In order to produce dyeable PP fibers, the PP was blended and melt spun with poly(butylene terephthalate) (PBT) at various ratios. First PP and PBT granules at blend ratios of 5, 10, 20, 30, 40 percent of PBT dispersed phase were physically mixed then the melt spinning of blended samples was carried out by a Maddock mixing zone extruder. The results showed that suitable exhaust dyeing process without using any carrier agents was possible for all PP/PBT alloy fiber samples. The dye uptake of samples significantly increased by increasing the PBT dispersed phase content. By increasing the PBT dispersed phase content decrease in the crystallinity percent resulting in significant enhancement in dye uptake of the alloy fiber samples was observed. A degree of four polynomial equation for dye uptake against blend ratio was obtained by which the optimum blend ratio was 72/28 percent of PP/PBT alloy fiber composition. In all alloy fiber dyed samples uniform coloration was observed. No considerable changes in the mechanical properties for dyed samples against undyed samples were observed. Interestingly, the best mechanical property among alloy fiber samples was observed in the sample containing 30 percent PBT dispersed phase which approximately corresponds to optimum blend ratio gained from mathematical calculations. In all PP/PBT alloy fiber samples strong fastness to soaping and very good to excellent fastness to light were achieved.     

Turning waste to wealth-biodegradable plastics polyhydroxyalkanoates from palm oil mill effluent – a Malaysian perspective

Palm oil industries have been contributing significantly towards the country’s economy and increase standard of living among Malaysians. However, it has also been identified as the major contributor for discharging the largest pollution load throughout the country. Owing to high biochemical oxygen demand (BOD) and chemical oxygen demand (COD), the palm oil mill effluent (POME) cannot be discharged directly into the environment. Thus, palm oil industries are facing tremendous challenges in order to comply with environmental regulations. While anaerobic digestion has been employed by most mills as primary treatment, POME can also be a potential source of degradable organic material which can be converted into value-added products and fine chemicals. Organic acids generated during acid-phase anaerobic digestion of POME could be a potential carbon source for the production of polyhydroxyalkanoates (PHA)- a biodegradable thermoplastic material of microbial origin. This paper aims at understanding how organic acids from POME may serve as a renewable feedstock for the biosynthesis of PHA.     

Appraisal of methane production and anaerobic fermentation kinetics of livestock manures using artificial neural networks and sinusoidal growth functions

This study aimed to perform a comparative analysis of the performance of five models (Gompertz, logistic, Richards, the first-order, artificial neural networks) in predicting methane production rate from anaerobic digestion of livestock manures. The input variables were fermentation time, digestion temperature, biogas temperature, ambient temperature, pH, and specific biogas production rate. The physicochemical compositions of cow manure and sheep manure showed that volatile solid (VS) contents were close to each other in manure compositions (77.6% and 64.7%, respectively), while the potential of methane production from cow manure (673.44 mL CH₄/g VS) was greater than that from sheep manure (320.32 mL CH₄/g VS). The determination coefficients (R²) for logistic function, Gompertz, Richards, the first-order, and ANN models were obtained as 0.968, 0.967, 0.975, 0.825, and 0.995 for the cow manure, respectively. In case of the sheep manure, the R² values obtained from these models were 0.976, 0.979, 0.981, 0.968 and 0.991, respectively. Although the determination coefficients of all models were in satisfactory agreement with the experimental data, the ANN model showed competitive lower RMSE values of 0.111 and 0.164 for cow and sheep manure data sets, respectively, indicating its superior performance than other models.

     

Antibacterial and Catalytic Performance of Green Synthesized Silver Nanoparticles Embedded in Crosslinked PVA Sheet

Journal of Polymers and the Environment - In this research work, a green method of using Saussurea costus extract for the synthesis of silver nanoparticles (AgNPs) is developed. Analysis of the...     

Propetamphos enhances chlorpyrifos-induced organophosphate-induced delayed neurotoxicity (OPIDN) in Hens: a role for plasma butyrylcholinesterase

This study examined dose-response effects of chlorpyrifos (CPF) and propetamphos (PRO) on producing organophosphorus-induced delayed neurotoxicity (OPIDN) in hens. A single oral dose of 1, 3, 30, or 100 mg/kg of each compound was administered individually, or in combination to groups of 10 hens. Plasma butyrylcholinesterase (BChE) activity was inhibited by all doses of each individual compound. Chlorpyrifos alone or in combination with PRO resulted in decreased acetylcholinesterase (AChE) activity. No dose of CPF or PRO alone resulted in the inhibition of neuropathy target esterase (NTE) or produced OPIDN. In contrast, combined exposure to high doses of CPF and PRO produced diminished NTE activity and produced OPIDN. Brain NTE activity was decreased by 67% and 71% by combined treatment of 100 mg/kg CPF with 30 mg/kg and 100 mg/kg PRO, respectively, consistent with the development of ataxia and paralysis, characteristic of OPIDN. Only the highest dose of CPF 100 mg/kg interacted with the two highest doses of PRO to block NTE and induce OPIDN, whereas no marked interaction occurred at lower doses. Data indicate that PRO enhances the ability of high doses of CPF to produce OPIDN by binding to plasma BChE that appears to act as a buffering system to modulate the toxicity of CPF. In effect, the ability of BChE to bind to CPF is diminished by PRO, resulting in more CPF delivery to the brain, and subsequent development of OPIDN at a dose that does not initiate this effect by itself.     

Efficient oxidation of sulfides into sulfoxides catalyzed by a chitosan–Schiff base complex of Cu(II) supported on supramagnetic Fe<Subscript>3</Subscript>O<Subscript>4</Subscript> nanoparticles

Sulfoxides are versatile synthetic intermediates for the preparation of biological products. Therefore, there is a need for efficient methods to oxidize sulfides into sulfoxides. Such oxidation may be catalyzed by magnetic nanocatalysts due to their good stability, easy synthesis, high surface area, low toxicity and easy separation by magnetic forces. Here we prepared a nanocatalyst by immobilization of the chitosan–Schiff base complex on supramagnetic Fe₃O₄ nanoparticles. The chitosan–Schiff base complex has been previously prepared by functionalization of chitosan with 5-bromosalicylaldehyde and metalation with copper(II) acetate. The catalyst was characterized by Fourier transform infrared, powder X-ray diffraction, transmission electron microscope, scanning electron microscopy, energy-dispersive X-ray spectroscopy and thermogravimetric analysis. Results show that the Fe₃O₄ nanoparticles and nanocatalyst were spherical in shape with an average size of 20 nm. Upon the covalently anchoring of chitosan–Schiff base Cu complex on the magnetic Fe₃O₄ nanoparticles, the average size increased to 60 nm. The prepared Fe₃O₄–chitosan–Schiff base Cu complex catalyzed very efficiently the oxidation of sulfides to sulfoxides with 100 % selectivity in all cases under green reaction conditions and excellent yields. Additionally, ease of recovery and reusability up to four cycles without noticeable loss of catalytic activity make the present protocol beneficial from industrial and environmental viewpoint.