Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in s...Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in susceptible cultivars, may cause severe economic losses. The goal of this study is to determine the effect of three organic calcium sources on the growth and quality of fruit production of tomatoes. Egg, snail and sea shell powders and extracts have been used as biological fertilizers. The experiment was conducted in a block factorial trial with three replications. The trials comprised two factors: calcium sources and calcium source form (powder and extract). The results showed that the growth parameters and yield were improved by the calcium source, whatever the form. Also, BER was lower in plants treated with calcium contrary to the control. However, plants treated with eggshells showed the best growth (mean) and the lowest rate (0.40%) of BER than the snail and sea shell.展开更多
Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in s...Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in susceptible cultivars, may cause severe economic losses. The goal of this study is to determine the effect of three organic calcium sources on the growth and quality of fruit production of tomatoes. Egg, snail and sea shell powders and extracts have been used as biological fertilizers. The experiment was conducted in a block factorial trial with three replications. The trials comprised two factors: calcium sources and calcium source form (powder and extract). The results showed that the growth parameters and yield were improved by the calcium source, whatever the form. Also, BER was lower in plants treated with calcium contrary to the control. However, plants treated with eggshells showed the best growth (mean) and the lowest rate (0.40%) of BER than the snail and sea shell.展开更多
Here, we examine 145 dinosaur eggshells from a new fossil locality in the Qiupa Formation （Upper Cretaceous） of the Luanchuan area in western Henan Province, China. The eggshells display elongatoolithid macro- and m...Here, we examine 145 dinosaur eggshells from a new fossil locality in the Qiupa Formation （Upper Cretaceous） of the Luanchuan area in western Henan Province, China. The eggshells display elongatoolithid macro- and microstructures, including ridges and nodes on the outer surface, two ultrastructurai layers, and an undulatory boundary between the mammillary and continuous layers. A phylogenic analysis shows that the Luanchuan eggshells belong to the ooclade Elongatoolithidae. Within Elongatoolithidae, the thickness ratio of the mammillary layer to the entire eggshell, and the porosity of the Luanchuan eggshells are comparable to the oogenera Macroolithus and Elongatoolithus. There is no direct evidence for the taxonomic identity of the Luanchuan eggshells; however, they were likely laid by oviraptorids based on their phylogenetic position and their similarities with known oviraptorid eggs.展开更多
The Cretaceous is one of the important periods of global drastic changes in geological history, and the paleoclimate and paleoenvironment in the period are now frontier research fields in geoscience. The record of the...The Cretaceous is one of the important periods of global drastic changes in geological history, and the paleoclimate and paleoenvironment in the period are now frontier research fields in geoscience. The record of the Cretaceous marine facies has been taken as a focal dissected object by 'Global Sedimentary Geological Program (GSGP)'. But the terrestrial sedimentary rocks were mainly formed in China during the Cretaceous,展开更多
Calcined eggshells (CES) were tested as adsorbent at a low cost for the removal of phenol from the waste water. The shells of Eggs extracts from waste were washed and then dried at a temperature of 60℃ and finally ca...Calcined eggshells (CES) were tested as adsorbent at a low cost for the removal of phenol from the waste water. The shells of Eggs extracts from waste were washed and then dried at a temperature of 60℃ and finally calcined in an oven at the atmospheric air in several temperatures 200℃, 400℃, 600℃, 800℃, 1000℃. The chemical composition of the obtained adsorbs was analyzed by the X-ray diffraction. The isothermal study of adsorption of the phenol was realized for the various adsorbates. It showed that the biggest efficiency of the elimination was attributed to the calcined eggshells to 1000℃with a percentage that reached 37%. The kinetics of adsorption were described by the first rate model. The intra particular distribution is a significant step in the adsorption process of phenol on calcined eggshells (CES). The separation factor gives a favorable adsorption of phenol on the CES.展开更多
The use of waste materials as low-cost adsorbents is attractive due to their contribution in the reduction of costs for waste disposal, therefore contributing to environmental protection and most importantly, offers a...The use of waste materials as low-cost adsorbents is attractive due to their contribution in the reduction of costs for waste disposal, therefore contributing to environmental protection and most importantly, offers an attractive potential alternative to their conventional methods of removal of toxic ions from wastewater. Eggshells are naturally occurring and an abundant biomass that has proven to offer an economic solution for toxic ions removal. The eggshell biomass was treated with acetic acid (vinegar). Nickel (II) and Cobalt (II) ions were selected as model ions to demonstrate the potential of eggshell waste in removing excess toxic heavy metal ions from wastewater. All the experiments were carried out in batch process with laboratory prepared samples. Multivariate optimization method was used to identify factors affecting adsorption. These factors included metal ion concentration, pH, contact time and biomass dosage on removal of nickel and cobalt from wastewater effluent was investigated. Two-level fraction factorial and central composite design were used for optimization methods. Fourier Transform Infrared Spectroscopy, Raman Spectroscopy, and Scanning Electron Microscopy coupled with Energy-dispersive X-ray spectroscopy were used to study physical properties of the waste material. The percentage removal of Nickel (II) and Cobalt (II) was 78.70 ± 1.02 and 76.53 ± 1.21 respectively. Vinegar-treated eggshells were proposed as eco-friendly, cheap, easily available and an efficient method for removal of heavy metals from the environment.展开更多
Chicken eggshell is one of the most common wastes generated from households,restaurants and other food processing outlets.Waste Chicken Eggshells(WCES)also constitutes an environmental nuisance and ends up discarded a...Chicken eggshell is one of the most common wastes generated from households,restaurants and other food processing outlets.Waste Chicken Eggshells(WCES)also constitutes an environmental nuisance and ends up discarded at dumping site with no consideration of further usage.The main constituent of WCES is calcium carbonate from which calcium or calcium oxide can be extracted for various applications.This current effort reviews recently published literature on the diverse applications of WCES.The considered utilization avenues include catalysts for biofuel production,construction industry,wastewater purification,industrial sector,food industry,medical,and agricultural applications.The specific areas of application apart from the transesterification reactions include cement additives and replacement in concrete,asphalt binder,adsorbent of metals and dyes,production of hydroxyapatite,food supplement and fortification,dentistry,therapeutics,bone formation,drug delivery,poultry feeds as well as organic fertilizer.For most of the identified applications,the WCES is subjected to pretreatment and other modification techniques before utilization.The conversion of WCES to valuable products is a cost-effective,safe,environmentally friendly,non-toxic and viable means of waste disposal and utilization.More investigations are needed to further explore the benefits derivable from this bioresource.展开更多
Brood parasitic birds constitute a model system for the study of coevolution.Such parasites are unique by having evolved unusually thick eggshells for their body size.ick eggshells have been hypothesized to evolve as ...Brood parasitic birds constitute a model system for the study of coevolution.Such parasites are unique by having evolved unusually thick eggshells for their body size.ick eggshells have been hypothesized to evolve as 1) a means of preventing damage to parasite eggs when the brood parasite lays its egg at a distance from the host clutch(the laying damage hypothesis);2) a consequence of host puncture ejection(the puncture resistance hypothesis);3) a means for the brood parasite to allocate calcium to development of a disproportionately large skeleto-muscular system in evicting parasite chicks(the chick vigour hypothesis);or 4) a means of protecting the cuckoo embryo from microorganisms in the nest of the host(the anti-bacterial protection hypothesis).Here we review the literature studying the evolutionary mechanisms promoting thick eggshells in avian brood parasites,and provide proposals for future studies to test their validity.Available data are insu cient to rigorously test exclusive predictions and assumptions of these not necessarily exclusive hypotheses,although the laying damage and the puncture resistance hypotheses seem to currently be the most well supported alternatives.We discuss how quanti cation of rejection modes(grasp ejection,puncture ejection and desertion) may disclose the validity of the puncture resistance hypothesis,and nally we provide perspectives for future research on testing this speci c hypothesis.展开更多
Isotopic data obtained from the dinosaur eggshells and pedogenic nodules(pedonodules)are interpreted in terms of palaeoclimatology.The material studied originated from the Bayn Dzak locality,Southern Gobi Aimak,Mongol...Isotopic data obtained from the dinosaur eggshells and pedogenic nodules(pedonodules)are interpreted in terms of palaeoclimatology.The material studied originated from the Bayn Dzak locality,Southern Gobi Aimak,Mongolia,having Late Cretaceous(Campanian)age.Stratigraphically the Bayn Dzak locality belongs to the Djadokhta Formation.All the present data(lithology,type of paleosols,FPS-profiles,geochemistry),and the isotopic characteristics of the selected samples show unequivocally that the environments of the Bayn Dzak area in Late Cretaceous(Campanian)time were warm to summer-hot,seasonally dry.Wet seasons(most probably,which took place in the winter time)were not longer than two months with not more than 400 mm precipitation per year.The distribution of isotope data in the dinosaur eggshells show the main relation,which is the dependence ofδ^13C andδ^18O values,i.e.specimens with heavy carbon isotope ratios are characterized by lighter oxygen isotope composition and conversely.Thus,theδ^13C andδ^18O values of the dinosaur eggshells display a clear positive correlation.It may be consequent both with the difference of the isotope composition of diet of the egg-lying animals modified by physicochemical isotope fractionation due to metabolism and changes in the isotope environment,and/or diagenetic alteration of the eggshell carbonate.Obtained isotopic data on the studied dinosaur eggshell fragments and the soil carbonates lend support to our assumption that diagenesis did not play significant role in changing the isotopic values.The distribution ofδ^13C andδ^18O values in eggshells and in pedogenic carbonates shows the visible opposite dependencies.展开更多
文摘Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in susceptible cultivars, may cause severe economic losses. The goal of this study is to determine the effect of three organic calcium sources on the growth and quality of fruit production of tomatoes. Egg, snail and sea shell powders and extracts have been used as biological fertilizers. The experiment was conducted in a block factorial trial with three replications. The trials comprised two factors: calcium sources and calcium source form (powder and extract). The results showed that the growth parameters and yield were improved by the calcium source, whatever the form. Also, BER was lower in plants treated with calcium contrary to the control. However, plants treated with eggshells showed the best growth (mean) and the lowest rate (0.40%) of BER than the snail and sea shell.
文摘Cultivated for its richness in nutrients, tomato culture is demanding fertilizer, especially in calcium. Calcium deficiencies and physiological disorders cause serious diseases in tomatoes. Blossom end rot (BER), in susceptible cultivars, may cause severe economic losses. The goal of this study is to determine the effect of three organic calcium sources on the growth and quality of fruit production of tomatoes. Egg, snail and sea shell powders and extracts have been used as biological fertilizers. The experiment was conducted in a block factorial trial with three replications. The trials comprised two factors: calcium sources and calcium source form (powder and extract). The results showed that the growth parameters and yield were improved by the calcium source, whatever the form. Also, BER was lower in plants treated with calcium contrary to the control. However, plants treated with eggshells showed the best growth (mean) and the lowest rate (0.40%) of BER than the snail and sea shell.
基金supported by the Natural Science Foundation of China(40872017)the Basic Outlay of Scientific Research Work from the Ministry of Science and Technology of the People's Republic of China,and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry,to L J.C
文摘Here, we examine 145 dinosaur eggshells from a new fossil locality in the Qiupa Formation （Upper Cretaceous） of the Luanchuan area in western Henan Province, China. The eggshells display elongatoolithid macro- and microstructures, including ridges and nodes on the outer surface, two ultrastructurai layers, and an undulatory boundary between the mammillary and continuous layers. A phylogenic analysis shows that the Luanchuan eggshells belong to the ooclade Elongatoolithidae. Within Elongatoolithidae, the thickness ratio of the mammillary layer to the entire eggshell, and the porosity of the Luanchuan eggshells are comparable to the oogenera Macroolithus and Elongatoolithus. There is no direct evidence for the taxonomic identity of the Luanchuan eggshells; however, they were likely laid by oviraptorids based on their phylogenetic position and their similarities with known oviraptorid eggs.
基金Project supported by the National Natural Science Foundation of China
文摘The Cretaceous is one of the important periods of global drastic changes in geological history, and the paleoclimate and paleoenvironment in the period are now frontier research fields in geoscience. The record of the Cretaceous marine facies has been taken as a focal dissected object by 'Global Sedimentary Geological Program (GSGP)'. But the terrestrial sedimentary rocks were mainly formed in China during the Cretaceous,
文摘Calcined eggshells (CES) were tested as adsorbent at a low cost for the removal of phenol from the waste water. The shells of Eggs extracts from waste were washed and then dried at a temperature of 60℃ and finally calcined in an oven at the atmospheric air in several temperatures 200℃, 400℃, 600℃, 800℃, 1000℃. The chemical composition of the obtained adsorbs was analyzed by the X-ray diffraction. The isothermal study of adsorption of the phenol was realized for the various adsorbates. It showed that the biggest efficiency of the elimination was attributed to the calcined eggshells to 1000℃with a percentage that reached 37%. The kinetics of adsorption were described by the first rate model. The intra particular distribution is a significant step in the adsorption process of phenol on calcined eggshells (CES). The separation factor gives a favorable adsorption of phenol on the CES.
文摘The use of waste materials as low-cost adsorbents is attractive due to their contribution in the reduction of costs for waste disposal, therefore contributing to environmental protection and most importantly, offers an attractive potential alternative to their conventional methods of removal of toxic ions from wastewater. Eggshells are naturally occurring and an abundant biomass that has proven to offer an economic solution for toxic ions removal. The eggshell biomass was treated with acetic acid (vinegar). Nickel (II) and Cobalt (II) ions were selected as model ions to demonstrate the potential of eggshell waste in removing excess toxic heavy metal ions from wastewater. All the experiments were carried out in batch process with laboratory prepared samples. Multivariate optimization method was used to identify factors affecting adsorption. These factors included metal ion concentration, pH, contact time and biomass dosage on removal of nickel and cobalt from wastewater effluent was investigated. Two-level fraction factorial and central composite design were used for optimization methods. Fourier Transform Infrared Spectroscopy, Raman Spectroscopy, and Scanning Electron Microscopy coupled with Energy-dispersive X-ray spectroscopy were used to study physical properties of the waste material. The percentage removal of Nickel (II) and Cobalt (II) was 78.70 ± 1.02 and 76.53 ± 1.21 respectively. Vinegar-treated eggshells were proposed as eco-friendly, cheap, easily available and an efficient method for removal of heavy metals from the environment.
文摘Chicken eggshell is one of the most common wastes generated from households,restaurants and other food processing outlets.Waste Chicken Eggshells(WCES)also constitutes an environmental nuisance and ends up discarded at dumping site with no consideration of further usage.The main constituent of WCES is calcium carbonate from which calcium or calcium oxide can be extracted for various applications.This current effort reviews recently published literature on the diverse applications of WCES.The considered utilization avenues include catalysts for biofuel production,construction industry,wastewater purification,industrial sector,food industry,medical,and agricultural applications.The specific areas of application apart from the transesterification reactions include cement additives and replacement in concrete,asphalt binder,adsorbent of metals and dyes,production of hydroxyapatite,food supplement and fortification,dentistry,therapeutics,bone formation,drug delivery,poultry feeds as well as organic fertilizer.For most of the identified applications,the WCES is subjected to pretreatment and other modification techniques before utilization.The conversion of WCES to valuable products is a cost-effective,safe,environmentally friendly,non-toxic and viable means of waste disposal and utilization.More investigations are needed to further explore the benefits derivable from this bioresource.
基金supported by National Natural Science Foundation of China (Nos.31071938 to AA,BGS and WL,31272328 to WL,31101646 and 31260514 to CY)Program for New Century Excellent Talents in University (NCET-10-0111 to WL)BGS and FF were funded by the Research Council of Norway (218144)
文摘Brood parasitic birds constitute a model system for the study of coevolution.Such parasites are unique by having evolved unusually thick eggshells for their body size.ick eggshells have been hypothesized to evolve as 1) a means of preventing damage to parasite eggs when the brood parasite lays its egg at a distance from the host clutch(the laying damage hypothesis);2) a consequence of host puncture ejection(the puncture resistance hypothesis);3) a means for the brood parasite to allocate calcium to development of a disproportionately large skeleto-muscular system in evicting parasite chicks(the chick vigour hypothesis);or 4) a means of protecting the cuckoo embryo from microorganisms in the nest of the host(the anti-bacterial protection hypothesis).Here we review the literature studying the evolutionary mechanisms promoting thick eggshells in avian brood parasites,and provide proposals for future studies to test their validity.Available data are insu cient to rigorously test exclusive predictions and assumptions of these not necessarily exclusive hypotheses,although the laying damage and the puncture resistance hypotheses seem to currently be the most well supported alternatives.We discuss how quanti cation of rejection modes(grasp ejection,puncture ejection and desertion) may disclose the validity of the puncture resistance hypothesis,and nally we provide perspectives for future research on testing this speci c hypothesis.
基金Supported by the State Program of the Geological Institute of Russian Academy of Sciences(No.0135-2019-0044)RFBR Project(No.18-04-00322)。
文摘Isotopic data obtained from the dinosaur eggshells and pedogenic nodules(pedonodules)are interpreted in terms of palaeoclimatology.The material studied originated from the Bayn Dzak locality,Southern Gobi Aimak,Mongolia,having Late Cretaceous(Campanian)age.Stratigraphically the Bayn Dzak locality belongs to the Djadokhta Formation.All the present data(lithology,type of paleosols,FPS-profiles,geochemistry),and the isotopic characteristics of the selected samples show unequivocally that the environments of the Bayn Dzak area in Late Cretaceous(Campanian)time were warm to summer-hot,seasonally dry.Wet seasons(most probably,which took place in the winter time)were not longer than two months with not more than 400 mm precipitation per year.The distribution of isotope data in the dinosaur eggshells show the main relation,which is the dependence ofδ^13C andδ^18O values,i.e.specimens with heavy carbon isotope ratios are characterized by lighter oxygen isotope composition and conversely.Thus,theδ^13C andδ^18O values of the dinosaur eggshells display a clear positive correlation.It may be consequent both with the difference of the isotope composition of diet of the egg-lying animals modified by physicochemical isotope fractionation due to metabolism and changes in the isotope environment,and/or diagenetic alteration of the eggshell carbonate.Obtained isotopic data on the studied dinosaur eggshell fragments and the soil carbonates lend support to our assumption that diagenesis did not play significant role in changing the isotopic values.The distribution ofδ^13C andδ^18O values in eggshells and in pedogenic carbonates shows the visible opposite dependencies.
