Whole_growing season pot experiments were conducted to examine the response of growth and water use efficiency ( WUE ) of spring wheat ( Triticum aestivum L. cv. Gaoyuan 602) to CO 2 enrichment. Wheat plants wer...Whole_growing season pot experiments were conducted to examine the response of growth and water use efficiency ( WUE ) of spring wheat ( Triticum aestivum L. cv. Gaoyuan 602) to CO 2 enrichment. Wheat plants were grown in open_top chambers (OTCs) subject to two concentrations of CO 2 ()(350 and 700 μL/L, hereafter 'ambient' and 'elevated' respectively) and three soil water levels (80%, 60% and 40% field water capacity ( FWC ), hereafter 'high soil moisture', 'medium soil moisture' and 'low soil moisture' respectively). Elevated CO 2 greatly increased leaf net photosynthesis ( Pn ) at all three soil water levels. The Pn of plants growing under elevated was 22% lower than that of plants growing at ambient when measured with the same (700 μL/L). Plant growth was enhanced by elevated throughout the growing season, with an increase of 14.8% in shoot dry weight at harvest under high soil moisture, and leaf area was increased by about 20% at all three soil water levels. Elevated in combination with high soil moisture increased the ratio of plant shoot dry weight to height by 15.7%, while this ratio was decreased by over 50% when plants were subject to drought. Elevated also increased the water use efficiency of wheat, mainly due to decreases in transpiration and cumulative consumption of water, and an increase in shoot dry weight, with the biggest value of 30% occurring at high soil water moisture level. Compared to high soil moisture, drought decreased shoot dry weight by 72% under ambient , and by 76% under elevated . Similarly, drought also reduced WUE by 19% under ambient , and 23% under elevated . Our results indicate that: (1) elevated can increase the photosynthetic rates, growth and WUE of wheat plants; (2) long_term exposure to high may result in lower photosynthetic capacity; (3) high stimulates plants lateral growth more than vertical growth; (4) the effects of CO 2 enrichment on plants depend on soil water status, with plants benefiting more from CO 2 enrichment if sufficient water is supplied; and (5) drought may cause relatively more reduction in plant growth and WUE under future elevated conditions.展开更多
Brassica campestris ssp. chinensis, also known as non-heading Chinese cabbage, is an important vegetable widely distributed in southern China. High temperature is the most common adversity factor in vegetable producti...Brassica campestris ssp. chinensis, also known as non-heading Chinese cabbage, is an important vegetable widely distributed in southern China. High temperature is the most common adversity factor in vegetable production, because Brassica campestris ssp. chinensis is a thermophilic vegetable, which can＇t well grow at high temperature. In summer and autumn, high temperature stress would prevent Brassica campestris ssp. chinensis from growing and result in poor quality of its seedlings, seriously influencing yield and quality of the vegetable in later period. In this paper, present situation and latest advances in heat resistance research of Brassica campestris ssp. chinensis in recent years were reviewed at home and abroad. The research tendency in Bassica campestris ssp. chinensis was also described, providing reference for breeding of heat-resistant Brassica campestris ssp. chinensis.展开更多
Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide （KOH） to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations o...Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide （KOH） to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations of 1% （KI）, 3% （[（2）, 6% （K3） and 9% （l（4） were tested for wheat straw pretreatment at ambient temperature with a C：N ratio of 25：1.86% of total solids （TS）, 89% of volatile solids （VS） and 22% of lignocellulose, cellulose and hemi- cellulose （LCH） （22%） were decomposed effectively with the wheat straw pretreated by 6% KOH. Enhanced bio- gas production and cumulative biomethane yield of 258 ml. （g VS）-1 were obtained increased by 45% and 41% respectively, compared with untreated wheat straw. Pretreated wheat straw digestion also yielded a digestate with higher fertilizer values potassium （l 38%）, calcium （22%） and magnesium （16%）. These results show that TS, VS and LCH can be effectively removed from wheat straw pretreated with KOH, improving biodegradability biomethane production and fertilizer value.展开更多
From an evolutionary point of view, reproduction timing is an important adaptation which enables the transfer of genetic properties, thus enabling species continuation. Rodents inhabiting arid environments need reliab...From an evolutionary point of view, reproduction timing is an important adaptation which enables the transfer of genetic properties, thus enabling species continuation. Rodents inhabiting arid environments need reliable cues for triggering their reproduction. Results of previous studies showed that increased dietary salinity plays an important role as an ultimate regulator for desert adapted rodents＇ reproductive system. The authors aimed discovering pathways by which high salinity can affect the reproductive system and metabolic status of desert adapted common spiny mice, Acomys cahirinus. Mice were challenged with osmotic stress, water source salinity increased gradually from 0.9% - 5% NaCI under short days （SD） and long days （LD）. The authors assessed leptin and free fatty acid （FFA） levels using ELISA while, SYBR green technology was used for relative receptor expression （RQ） of target genes. Results revealed that serum levels of the hormone leptin were significantly （P 〈 0.05） reduced in salinity treated （ST） mice. Levels of FFA were significantly （P 〈 0.05） increased in LD- and SD-ST-males. In ST-SD females a significant increase （P 〈 0.05） in expression levels of leptin （Ob-Rt） mRNA receptor gene, in ovaries was noted. Aldosteron （Nr3c2） and vasopressin （AVP） mRNA receptor expression genes levels were significantly （P 〈 0.05） increased in both LD- and SD- ST- males.展开更多
Japan’s economy lost most of its industrial production force as a result of World War II. However, from 1955 onwards, Japan has achieved rapid economic growth, joining the group of the world’s most developed countri...Japan’s economy lost most of its industrial production force as a result of World War II. However, from 1955 onwards, Japan has achieved rapid economic growth, joining the group of the world’s most developed countries by the early 1970s. The period from 1955 to the early 1970s is generally regarded as a period of High Economic Growth. There are various opinions regarding the factors that enabled Japan to attain such high economic growth, referred to as the Economic Miracle. It can be said that Japan’s post-war economic development was the result of advancements in technological innovation on the basis of financial assistance from the United States, which established Japan’s position in the world economy, loans from the bank, and the introduction of technology from abroad. Needless to say, the “high growth of post-war Japanese capitalism has not been achieved only by giant companies alone. On the contrary, without small businesses, especially in their roles as subcontractors, it would have been impossible to achieve such high growth, which has drawn attention internationally” （Nomura, 1981, p. 126）. The purpose of this presentation is to make clear the role of small businesses in the process of economic development.展开更多
Based on continuum power regression(CPR) method, a novel derivation of kernel partial least squares(named CPR-KPLS) regression is proposed for approximating arbitrary nonlinear functions.Kernel function is used to map...Based on continuum power regression(CPR) method, a novel derivation of kernel partial least squares(named CPR-KPLS) regression is proposed for approximating arbitrary nonlinear functions.Kernel function is used to map the input variables(input space) into a Reproducing Kernel Hilbert Space(so called feature space),where a linear CPR-PLS is constructed based on the projection of explanatory variables to latent variables(components). The linear CPR-PLS in the high-dimensional feature space corresponds to a nonlinear CPR-KPLS in the original input space. This method offers a novel extension for kernel partial least squares regression(KPLS),and some numerical simulation results are presented to illustrate the feasibility of the proposed method.展开更多
文摘Whole_growing season pot experiments were conducted to examine the response of growth and water use efficiency ( WUE ) of spring wheat ( Triticum aestivum L. cv. Gaoyuan 602) to CO 2 enrichment. Wheat plants were grown in open_top chambers (OTCs) subject to two concentrations of CO 2 ()(350 and 700 μL/L, hereafter 'ambient' and 'elevated' respectively) and three soil water levels (80%, 60% and 40% field water capacity ( FWC ), hereafter 'high soil moisture', 'medium soil moisture' and 'low soil moisture' respectively). Elevated CO 2 greatly increased leaf net photosynthesis ( Pn ) at all three soil water levels. The Pn of plants growing under elevated was 22% lower than that of plants growing at ambient when measured with the same (700 μL/L). Plant growth was enhanced by elevated throughout the growing season, with an increase of 14.8% in shoot dry weight at harvest under high soil moisture, and leaf area was increased by about 20% at all three soil water levels. Elevated in combination with high soil moisture increased the ratio of plant shoot dry weight to height by 15.7%, while this ratio was decreased by over 50% when plants were subject to drought. Elevated also increased the water use efficiency of wheat, mainly due to decreases in transpiration and cumulative consumption of water, and an increase in shoot dry weight, with the biggest value of 30% occurring at high soil water moisture level. Compared to high soil moisture, drought decreased shoot dry weight by 72% under ambient , and by 76% under elevated . Similarly, drought also reduced WUE by 19% under ambient , and 23% under elevated . Our results indicate that: (1) elevated can increase the photosynthetic rates, growth and WUE of wheat plants; (2) long_term exposure to high may result in lower photosynthetic capacity; (3) high stimulates plants lateral growth more than vertical growth; (4) the effects of CO 2 enrichment on plants depend on soil water status, with plants benefiting more from CO 2 enrichment if sufficient water is supplied; and (5) drought may cause relatively more reduction in plant growth and WUE under future elevated conditions.
基金Supported by Modern Agricultural Industry Technology System Special Funds(CARS-25)Innovation Funds of Jiangxi Academy of Agricultural Sciences(2010CBS004)~~
文摘Brassica campestris ssp. chinensis, also known as non-heading Chinese cabbage, is an important vegetable widely distributed in southern China. High temperature is the most common adversity factor in vegetable production, because Brassica campestris ssp. chinensis is a thermophilic vegetable, which can＇t well grow at high temperature. In summer and autumn, high temperature stress would prevent Brassica campestris ssp. chinensis from growing and result in poor quality of its seedlings, seriously influencing yield and quality of the vegetable in later period. In this paper, present situation and latest advances in heat resistance research of Brassica campestris ssp. chinensis in recent years were reviewed at home and abroad. The research tendency in Bassica campestris ssp. chinensis was also described, providing reference for breeding of heat-resistant Brassica campestris ssp. chinensis.
基金Supported by Specialized Research Fund for the Doctoral Program of Higer Education(20120010110004)the Natural Science Foundation of Beijing(8142030)
文摘Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide （KOH） to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations of 1% （KI）, 3% （[（2）, 6% （K3） and 9% （l（4） were tested for wheat straw pretreatment at ambient temperature with a C：N ratio of 25：1.86% of total solids （TS）, 89% of volatile solids （VS） and 22% of lignocellulose, cellulose and hemi- cellulose （LCH） （22%） were decomposed effectively with the wheat straw pretreated by 6% KOH. Enhanced bio- gas production and cumulative biomethane yield of 258 ml. （g VS）-1 were obtained increased by 45% and 41% respectively, compared with untreated wheat straw. Pretreated wheat straw digestion also yielded a digestate with higher fertilizer values potassium （l 38%）, calcium （22%） and magnesium （16%）. These results show that TS, VS and LCH can be effectively removed from wheat straw pretreated with KOH, improving biodegradability biomethane production and fertilizer value.
文摘From an evolutionary point of view, reproduction timing is an important adaptation which enables the transfer of genetic properties, thus enabling species continuation. Rodents inhabiting arid environments need reliable cues for triggering their reproduction. Results of previous studies showed that increased dietary salinity plays an important role as an ultimate regulator for desert adapted rodents＇ reproductive system. The authors aimed discovering pathways by which high salinity can affect the reproductive system and metabolic status of desert adapted common spiny mice, Acomys cahirinus. Mice were challenged with osmotic stress, water source salinity increased gradually from 0.9% - 5% NaCI under short days （SD） and long days （LD）. The authors assessed leptin and free fatty acid （FFA） levels using ELISA while, SYBR green technology was used for relative receptor expression （RQ） of target genes. Results revealed that serum levels of the hormone leptin were significantly （P 〈 0.05） reduced in salinity treated （ST） mice. Levels of FFA were significantly （P 〈 0.05） increased in LD- and SD-ST-males. In ST-SD females a significant increase （P 〈 0.05） in expression levels of leptin （Ob-Rt） mRNA receptor gene, in ovaries was noted. Aldosteron （Nr3c2） and vasopressin （AVP） mRNA receptor expression genes levels were significantly （P 〈 0.05） increased in both LD- and SD- ST- males.
文摘Japan’s economy lost most of its industrial production force as a result of World War II. However, from 1955 onwards, Japan has achieved rapid economic growth, joining the group of the world’s most developed countries by the early 1970s. The period from 1955 to the early 1970s is generally regarded as a period of High Economic Growth. There are various opinions regarding the factors that enabled Japan to attain such high economic growth, referred to as the Economic Miracle. It can be said that Japan’s post-war economic development was the result of advancements in technological innovation on the basis of financial assistance from the United States, which established Japan’s position in the world economy, loans from the bank, and the introduction of technology from abroad. Needless to say, the “high growth of post-war Japanese capitalism has not been achieved only by giant companies alone. On the contrary, without small businesses, especially in their roles as subcontractors, it would have been impossible to achieve such high growth, which has drawn attention internationally” （Nomura, 1981, p. 126）. The purpose of this presentation is to make clear the role of small businesses in the process of economic development.
文摘Based on continuum power regression(CPR) method, a novel derivation of kernel partial least squares(named CPR-KPLS) regression is proposed for approximating arbitrary nonlinear functions.Kernel function is used to map the input variables(input space) into a Reproducing Kernel Hilbert Space(so called feature space),where a linear CPR-PLS is constructed based on the projection of explanatory variables to latent variables(components). The linear CPR-PLS in the high-dimensional feature space corresponds to a nonlinear CPR-KPLS in the original input space. This method offers a novel extension for kernel partial least squares regression(KPLS),and some numerical simulation results are presented to illustrate the feasibility of the proposed method.
