早春花椰菜生理性异变的原因及防治

早春花椰菜栽培过程中,因管理不当,常出现生理性异变,不仅产量降低,而且影响了花椰菜的商品品质,部分花椰菜甚至不能上市出售.致使花椰菜种植户收入大幅度降低,因此预防花椰菜生理性异变,是早春花椰菜栽培过程中的关键措施之一.

葡萄生理性穗轴褐变的发生原因及预防途径

文章以葡萄生理性穗轴褐变的发生原因及预测途径为研究对象,首先对葡萄生理性穗轴褐变表现及发生原因进行了探讨分析,随后结合问题原因,提出了一些预防途径,以供参考。

母牛繁殖期的生理变化

在现实生活中养殖户只有对母牛的生殖器官及其功能有了基本的了解之后，才能进一步了解其繁殖期的生理性变化，即一头母牛在繁殖时都发生了那些变化。

花椰菜生理性异变的原因及防治

1．花球早现 花球出现早，花球小，产量低。原因：苗龄过长，栽后大蹲苗，或移植时伤根过多，春季长期低温，品种选择不当等。防治措施：春播花椰菜应选用适应性强的品种。适期育苗，早春苗龄不得超过60天．6片～7片真叶时及时定植，为防移植时伤根，最好采用8厘米×10厘米的营养钵育苗。定植后。经常保持土壤湿润。

Genetic variations of wood properties and growth characters of Ko-rean pines from different provenances

Totally 26 provenance stands of 17-year-old Korean pine were selected for investigating wood properties and growth characters in Mao抏rshan Experimental Forest Farm of Northeast Forestry University in 1999. The anatomical property indexes, including tracheid length, tracheid diameter and wall-indiameter ratio, and the physical property indexes, such as growth ring width, late wood percentage and growth ring density, were measured for wood properties. Growth character indexes, including tree height and diameter at breast height, were also measured. The analytical results showed that there exited obviously dif-ference in wood property indexes between different provenances, which is suggested that wood properties are controlled by their genetic differences. The growth character indexes of Korean pines presented significant difference and they might also be controlled by their genetic differences. Most parameters of wood properties mainly varied in the direction of longitude, but the parameters of growth characters varied in the direction of latitude.

Physiological Analysis of Two Arabidopsis thaliana Mutants in Response to CO2

[Objective] The 15urpose was to seek for the different phenotypes between wild type and Arabidopsis Mutants in response to CO2. [Method] The epidermis bioassays and seed germination test were carried out to analyze the physiological characteristics of two Arabidopsis mu- tants and their wild type. [Result] There existed distinct differences in stomata apertures, water loss and leaf temperature compared with wild type except for stomata density. In addition, seed germination test on the medium indicated that cdfl was insensitive to ABA, mannitol and NaCI, but cdsl performed contrary to cdil. [ Conclusion] There are some different physiological characteristics between wild type and mutants.

Physiological and Biochemical Characteristic of a Stripe Mutant with Abnormal Flower Organs in Rice

[Objective] The experiment aimed to explore physiological and biochemical changes of leaves after plants were mutated. [Method] A rice double mutant with stripes on stems, leaves and spikelets were taken as experimental materials to study the enzyme activity changes in different growth stages and amino acid variation in rice. [ Result] The SOD activity in mutant was higher than that in wild plant at tillering metaphase, but lower than that in wild type before heading stage and late flowering; the POD activity in three stages increased firstly then declined and the activity showed highest maximal activity at before heading stage. However, the POD activity in wild type showed the opposite change trend; the CAT activity presented degression at three stages, especially high at tillering metaphase, but reverse changes in wild type; the MDA activity decreased at three stages, but it was still higher than that in wild type, besides, the soluble sugar content of mutant was lower, but total amino acid content was increased. [ Conclusion] The expression of mutant characteristics was correlated with SOD, POD, CAT and MDA activity Changes and these changes made the mutant survive and rice quality change at last.

Physiological and Biochemical Response of Artificial Wetland Plant under Electric Field

By measuring wetland plants chlorophyll content,malondialdehyde(MDA) content and superoxide dismutase(SOD) enzyme activity,the changes of wetland plant physiological characeristics under different power strength were studied,and the mechanism of electric field on plant physiological characteristics was analyzed to provide a theoretical basis for the pollutant removal ability strengthening of artificial wetland under electricfield.The results showed that compared with the control plants,low-intensity-voltage(1 V and 3 V) had no significant effect on the normal physiological and biochemical indexes of the plants,and the growth trend was better than the control group;with the voltage increasing,plant chlorophyll content,MDA content and SOD activity were greatly affected,indicating that plants were under strong oxidative stress,and the growth was damaged.Therefore,a suitable electric field could enhance the sewage treatment effect of constructed wetland.

Screening of Drought-tolerant Brassica napus L.Varieties and Analysis on Their Physiologic and Biochemical Variations under Drought Stress

[Objective] The aim of this study was to screen drought-tolerant Brassica napus L. germplasm resources by analyzing their physiological and biochemical changes under drought stress. [Method] Forty varieties of B. napus varieties were cultured under PEG-6000 osmotic stress and extreme drought stress in pots, re- spectively. Then, the contents of chlorophyll, carotenoid, proline, malondialdehyde （MDA）, soluble sugar, soluble protein, and the activities of superoxide dismutase （SOD）, catalase（CAT）, peroxidase（POD） were measured under drought stress. [Result] Sever- al drought-tolerant varieties of B. napus were screened out： YAU200908, Xiangyou No.15, YAU200903, YAU200907, YAU200906 and YAU200904. Physiological and biochemical analysis showed that, the contents of chlorophyll and carotenoid de- creased with drought stress increasing; the contents of proline, soluble sugar, solu- ble protein, MDA and the activities of SOD,CAT, POD raised with drought stress in- creasing. [Conclusion] In the rapeseed varieties with stronger drought tolerance, the decrease in carotenoid content and the increase in proline content, soluble sugar content, MDA content, SOD activity, CAT activity were more obvious, so all these physiological and biochemical indices can be used to evaluate the drought tolerance of rapeseed.

小麦生产灾害性天气的预防与对策

一、灾害性天气对小麦不同生育时期的影响灾害性天气导致小麦不能正常生长的现象主要反映在内部生长不协调、外部发生非生理性变化上。各生育时期的表现有下列情况：一是秋末冬初乃至整个冬季持续干旱不能壮苗越冬。年前分蘖少、年后分蘖成穗率低导致每667m^2成穗不足。影响产量构成。如2011年。

说脸红

人的脸色变化原因很复杂，既有生理性变化，也有病理性变化；既与面部血管的收缩或扩张及皮肤的特点有关，也与血红蛋白与不同物质结合后所呈现的颜色有关。

分门别类说补养

人在进行体育锻炼时，体内会发生一系列的生理性变化：中枢神经系统活动紧张、内分泌机能提高、新陈代谢旺盛、能量消耗增多、体内的糖与脂肪分解量激增，蛋白质代谢加快，维生素与矿物质的分解量变大……这些变化，使身体对各种营养物质的需求量大大提高。为了使体育锻炼能够取得更好的强身健体效果，合理补充营养是非常重要的。

Impacts of global warming on marine zooplankton

Global warming has been being a serious issue since 1980, and it impacts environment and biosphere. Here, we reviewed the physiological and ecological responses of marine zooplankton which is an important component of biosphere to the global warming. Much research on physiological changes in response to different temperature is given to discuss this issue. Furthermore, we focused on ecological changes of zooplankton to global warming and several indices such as abundance, biomass, biodiversity and biogeographic boundary are enumerated. Phenological changes of zooplankton were presented, followed by the prospects of this subject, viz. observing more functional groups, more concerning on zooplankton in tropical region and investigation on a species-level zooplankton system.

Pathophysiology of insulin resistance and steatosis in patients with chronic viral hepatitis

Chronic hepatitis due to any cause leads to cirrhosis and end-stage liver disease.A growing body of literature has also shown that fatty liver due to overweight or obesity is a leading cause of cirrhosis.Due to the obesity epidemic,fatty liver is now a significant problem in clinical practice.Steatosis has an impact on the acceleration of liver damage in patients with chronic hepatitis due to other causes.An association between hepatitis C virus (HCV) infection,steatosis and the onset of insulin resistance has been reported.Insulin resistance is one of the leading factors for severe fibrosis in chronic HCV infections.Moreover,hyperinsulinemia has a deleterious effect on the management of chronic HCV.Response to therapy is increased by decreasing insulin resistance by weight loss or the use of thiazolidenediones or metformin.The underlying mechanisms of this complex interaction are not fully understood.A direct cytopathic effect of HCV has been suggested.The genomic structure of HCV (suggesting that some viral sequences are involved in the intracellular accumulation of triglycerides),lipid metabolism,the molecular links between the HCV core protein and lipid droplets (the core protein of HCV and its transcriptional regulatory function which induce a triglyceride accumulation in hepatocytes) and increased neolipogenesis and inhibited fatty acid degradation in mitochondria have been investigated.

Rheological and Structural Properties of Sea Cucumber Stichopus japonicus During Heat Treatment

Changes in tissue structure, rheological properties and water content of raw and heated sea cucumber meat were studied. Sea cucumber Stichopus japonicus was heated at 25℃, 70℃ and 100℃ water for 5 min. The structural changes were observed using a light microscope and the rheological parameters （rupture strength, adhesive strength and deformation） determined using a texture meter. Microscopic photograph revealed that the structural change of heated meat was greater than that of raw meat. The rupture strength, adhesive strength and deformation of raw meat were smaller than those of the heated meat. Meanwhile, rheological parameters showed positive correlation with heating temperature. These changes are mainly caused by thermal denaturation and gelatinization of collagen during heating. These changes were also evidenced in observations using a light microscope and differential scanning calorimetry.