scholarly journals Interactions Between Chill-Hours and Degree-Days Affect Carpogenic Germination in Monilinia vaccinii-corymbosi

2001 ◽  
Vol 91 (1) ◽  
pp. 77-83 ◽  
Author(s):  
H. Scherm ◽  
A. T. Savelle ◽  
P. L. Pusey
Keyword(s):  
Laboratory Experiments ◽  
Field Experiments ◽  
Degree Days ◽  
Carpogenic Germination ◽  
Conditioning Period ◽  
Low Degree ◽  
Heating Degree Days ◽  
Relationship Of ◽  
High Degree ◽  
The Relationship

The relationship of cumulative chill-hours (hours with a mean temperature <7.2°C) and heating degree-days (base 7.2°C) to carpogenic germination of pseudosclerotia of Monilinia vaccinii-corymbosi, which causes mummy berry disease of blueberry, was investigated. In two laboratory experiments, pseudosclerotia collected from rabbiteye blueberry in Georgia were conditioned at 5 to 6°C for 26 to 1,378 h prior to placement in conditions favorable for germination and apothecium development. The number of chill-hours accumulated during the conditioning period affected the subsequent proportion of pseudosclerotia that germinated and produced apothecia, with the greatest incidence of carpogenic germination occurring after intermediate levels of chilling (≈700 chill-hours). The minimum chilling requirement for germination and apothecium production was considerably lower than that reported previously for pseudo-sclerotia from highbush blueberry in northern production regions. The rate of carpogenic germination was strongly affected by interactions between the accumulation of chill-hours and degree-days during the conditioning and germination periods; pseudosclerotia exposed to prolonged chilling periods, once transferred to suitable conditions, germinated and produced apothecia more rapidly (after fewer degree-days had accumulated) than those exposed to shorter chilling periods. Thus, pseudosclerotia of M. vaccinii-corymbosi are adapted to germinate carpogenically following cold winters (high chill-hours, low degree-days) as well as warm winters (low chill-hours, high degree-days). Results were validated in a combined field-laboratory experiment in which pseudosclerotia that had received various levels of natural chilling were allowed to germinate in controlled conditions in the laboratory, and in two field experiments in which pseudosclerotia were exposed to natural chilling and germination conditions. A simple model describing the timing of apothecium emergence in relation to cumulative chill-hours and degree-days was developed based on the experiments. The model should be useful for better timing of field scouting programs for apothecia to aid in management of primary infection by M. vaccinii-corymbosi.

The Relationship of Oxygen Consumption to Age and Weight During the Post-Embryonic Growth of Locusta Migratoria L

1957 ◽  
Vol 34 (1) ◽  
pp. 29-41
Author(s):  
KENNETH U. CLARKE
Keyword(s):  
Oxygen Consumption ◽  
Locusta Migratoria ◽  
Live Weight ◽  
Normal Growth ◽  
Low Degree ◽  
Straight Lines ◽  
Relationship Of ◽  
High Degree ◽  
The Relationship ◽  
Considerable Range

The weight and oxygen consumption of individual locusts, six from each instar, have been measured at 12-hourly intervals throughout each stadium. An analysis of short duration changes shows that fluctuations in live weight are unavoidable in the growing animal, and that they are accompanied by fluctuations in oxygen consumption. In time the latter lag behind the former. As the fluctuations of these two variables are out of phase, there is a considerable range of oxygen consumption which must be regarded as normal for any given weight. Calculations are made to find the limits of these fluctuations compatible with normal growth. The changes that occur during a stadium can be represented by a straight trend line for both weight and oxygen consumption. Exceptions occur in the case of weight of the adult where two straight lines are necessary, one for the growing phase and one for the steady phase of this instar. In certain cases in the fifth instar two straight lines are necessary to express the trend in oxygen consumption which may show an abrupt change in the middle of the stadium. A high degree of correlation is found between the trend lines for weight and oxygen consumption in the early instars. A low degree is found in latter instars where the weight increases and the oxygen consumption remains nearly constant. A curve representing the changes of weight and oxygen consumption that occur during the growth of the locust has been constructed.

scholarly journals Rhombic calcite microcrystals as a textural proxy for meteoric diagenesis

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Mohammed S. Hashim ◽  
Stephen E. Kaczmarek
Keyword(s):  
Trace Elements ◽  
Laboratory Experiments ◽  
Crystal Form ◽  
Geochemical Data ◽  
Carbonate Sediments ◽  
Geochemical Evidence ◽  
Meteoric Diagenesis ◽  
Low Degree ◽  
Rock Record ◽  
High Degree

AbstractNumerous Phanerozoic limestones are comprised of diagenetic calcite microcrystals formed during mineralogical stabilization of metastable carbonate sediments. Previous laboratory experiments show that calcite microcrystals crystallizing under conditions similar to those that characterize meteoric diagenetic settings (impurity-free, low degree of supersaturation, high fluid:solid ratio) exhibit the rhombic form/morphology, whereas calcite microcrystals crystallizing under conditions similar to those that prevail in marine and marine burial diagenetic settings (impurity-rich, high degree of supersaturation, low fluid:solid ratio) exhibit non-rhombic forms. Based on these experimental observations, it is proposed here that rhombic calcite microcrystals form exclusively in meteoric environments. This hypothesis is tested using new and previously published textural and geochemical data from the rock record. These data show that the vast majority of Phanerozoic limestones characterized by rhombic microcrystals also exhibit petrographic and/or geochemical evidence (depleted δ13C, δ18O, and trace elements) indicative of meteoric diagenesis whereas non-rhombic forms are associated with marine burial conditions. By linking calcite microcrystal textures to specific diagenetic environments, our observations bring clarity to the conditions under which the various microcrystal textures form. Furthermore, the hypothesis that rhombic calcite microcrystals form exclusively in meteoric environments implies that this crystal form may be a useful textural proxy for meteoric diagenesis.

scholarly journals The Development of Snow and Glacier Research in Switzerland

1948 ◽  
Vol 1 (04) ◽  
pp. 192-201 ◽  
Author(s):  
R. Haefeli
Keyword(s):  
Mechanical Properties ◽  
Snow Cover ◽  
Laboratory Experiments ◽  
Relationship Of ◽  
The Relationship ◽  
Research Institute

The evolution of snow and glacier research in Switzerland is outlined. The settling, creep, viscosity and slipping of the snow cover are discussed in detail and the relationship of these comparatively simple processes to the more complex movements in a glacier are described. The importance of further research in glacier physics in connection with the crystallographic and mechanical properties of ice is stressed; certain preliminary laboratory experiments and some subjects for further research in the field are suggested. The Great Aletsch Glacier is recommended for this owing to the proximity of the Jungfraujoch Research Institute and facilities for transport by the Jungfraujoch Railway.

Study on the Relationship of the Quantity of CO2 Produced and the Wind Speed

2014 ◽  
Vol 881-883 ◽  
pp. 1638-1641
Author(s):  
Xian Long Sun ◽  
Er Xin Gao ◽  
Hong Fen Zhang ◽  
Qiang Wang ◽  
Li Juan Li
Keyword(s):  
Experimental Data ◽  
Wind Speed ◽  
Coal Seam ◽  
Coal Mine ◽  
Laboratory Experiments ◽  
Spontaneous Combustion ◽  
Geothermal Heat ◽  
Research Results ◽  
Relationship Of ◽  
The Relationship

Based on the geological and the experimental data of the13#coal seam of Sun-Cun Coal Mine, the relationship curve between the geothermal heat in Sun-Cun coal mine and experimental wind speed has been fit out.According this and the laboratory experiments,the relational expression between the quantity of CO2 produced in the period of spontaneous combustion and the wind speed in the coal mine has been developed. The research results show that when the wind speed exceeds 2m/s,the quantity of CO2 produced has a sharp rising tendency.

Prospecting Direction and Geological Characteristics of the Jiwa Area, Nima County, Tibet

2012 ◽  
Vol 616-618 ◽  
pp. 73-79
Author(s):  
Jian Guo Wang
Keyword(s):  
Gold Deposits ◽  
Comprehensive Analysis ◽  
Geological Characteristics ◽  
Evolution Characteristics ◽  
Low Degree ◽  
Distribution Of Elements ◽  
Vein Type ◽  
Relationship Of ◽  
The Relationship ◽  
Rock Strata

It is a low degree of geological studiedness in Jiwa area, the published synthesis and other reliable data is rare. By adopting similar analogy and comprehensive analysis methods, it found that the content is the highest about Au, As, Sb, Cu and W based on the relationship of the distribution of elements and time, this characteristic has reflected the evolution characteristics of carbonate in Palaeozoic in this area. The content is the highest about Pb, Zn, Ag and Cd in volcanic rock strata in Paleogene-Neogene, it reflected that the characteristic of elements associations related to intermediate-acidic volcanic activity. The content is the highest about Au, Ag and Sn in strata in Quaternary, which would forms gold deposits (spots), it reflected mainly the characteristic of elements mineral enrichment related with weathering origin in period. There are three minerals-ore combination types of wolframite-molybdenum-bismuthinite-chalcopyrite-pyrite quartz vein type, wolframite-molybdenum-bismuthinite-chalcopyrite-pyrite mica-quartz type, tungsten-molybden- limonite ores-oxidised type. Prospecting direction is Au-Pb-Zn hydrothermal filling type, the Cu deposit of sand-type and skarn-type copper polymetallic deposit. It has very important theory and real sense via scientific investigation of main geologic characteristics and metallogenic models research in Jiwa area.

Impact of Plant Spacing and Population on Yield for Single-Row Nonirrigated Peanuts (Arachis hypogaea L.)

2000 ◽  
Vol 27 (2) ◽  
pp. 52-56 ◽  
Author(s):  
D. A. Sternitzke ◽  
M. C. Lamb ◽  
J. I. Davidson ◽  
R. T. Barron ◽  
C. T. Bennet
Keyword(s):  
Field Experiments ◽  
Rate Of Change ◽  
Plant Spacing ◽  
Lower Yield ◽  
Arachis Hypogaea L ◽  
Average Plant ◽  
Relationship Of ◽  
The Relationship ◽  
Water Nutrients ◽  
Lower Population

Abstract Poor peanut emergence often results in lower yield and loss of revenue. Farmers attempting to recapture lost income sometimes lose even more by replanting because replant costs may exceed the benefits of added yield. The purpose of this study was to develop an empirical equation to predict peanut yield based on total emergence 21 d after planting and an estimate of yield for a full stand of peanuts. Field experiments were conducted in Terrell Co., Georgia during 1997 and 1998 for nonirrigated peanut (cv. Georgia Green) grown in an Americus sand (thermic Rhodic Paleudults). To mimic poor emergence and concomitant random plant spacing, rows within plots were thinned at random locations to attain populations of 4.4, 3.3, 2.6, 2.1, and 1.6 plants/m-row. Control plots were not thinned and total emergence was approximately 12.7 plants/m-row. As total emergence and population decreased, yield also decreased whereas pod mass per plant increased. This increase was likely attributed to a reduction in competition from adjacent peanut plants for water, nutrients, and light. Higher population treatments had smaller pod mass/plant and greater overall yield than lower population treatments with higher pod mass/plant. Random plant-to-plant spacing associated with poor emergence was used to predict pod mass/plant as a function of average plant spacing. Results from this research established models defining the relationship of the rate of change of pod mass per plant with average plant spacing and provided a new method of predicting yield in the event of poor emergence.

scholarly journals The degree at which the first three basic grades pupils practice the ethical values from the point of view of their teachers in the Southern Ghors District: مدى ممارسة طلبة الصفوف الثلاثة الأولى من المرحلة الأساسية للقيم الأخلاقية من وجهة نظر معلماتهم في لواء الأغوار الجنوبية

2020 ◽  
Vol 4 (10) ◽  
Author(s):  
Anwar Eisa Salmeh Al-Khleifat, Ali Salmeh Daowd Al-khleifat
Keyword(s):  
Point Of View ◽  
Teaching Staff ◽  
Ethical Values ◽  
Validity And Reliability ◽  
Study Results ◽  
Secondary Stage ◽  
Islamic Religion ◽  
Relationship Of ◽  
High Degree ◽  
The Relationship

This study aimed at identifying the degree at which the first three basic grades pupils practice the ethical values from the point of view of their teachers in the Southern Ghor District، as well as، the relationship of that with some variables. The researchers developed the study tool that consisted of، ( 27 ) items divided into three domains; the validity and reliability of the study tool were verified. The study sample consisted of (50) female teachers from those who teach the first three basic grades. The study results showed that، the degree at which the first three basic grades pupils practice the ethical values from the point of view of their teachers in the Southern Ghor، District، was high. The domain relating to (the relationship between the pupil and the teaching staff) was in the first place، followed by (the relationship between the pupil and his teacher)، and finally (the relationship between the pupil and his peers). The results showed that there are no statistically significant differences at ( α≤ 0.05 )، regarding the degree at which the first three basic grades pupils practice the ethical values from the point of view of their teachers in the Southern Ghor District attributed to the variables of the years of experience as well as educational qualification. In the light of the results، the study recommended that، the students should practice the ethical values in a high degree with their peers by educating the pupils regarding the brotherhood in our Islamic religion as well as practicing these behaviors in front of the students to reinforce them. The study also recommended about conducting a study that reveals the degree at which the secondary stage students practice the ethical values from the point of view of their teachers in the Southern Ghor District.

scholarly journals ON FORECASTING THE INSURANCE MARKET IN RUSSIA AND IN THE ASTRAKHAN REGION

2018 ◽  
pp. 125-132
Author(s):  
Tatyana Vladimirovna Kotova ◽  
Ekaterina Vladimirovna Sokolova ◽  
Elena Vladimirovna Chernikina
Keyword(s):  
Russian Federation ◽  
Insurance Market ◽  
Insurance Companies ◽  
Positive Tendency ◽  
The Russian Federation ◽  
License Revocation ◽  
Relationship Of ◽  
High Degree ◽  
The Given ◽  
The Relationship

Insurance companies, being one of the most important links in the financial system of the country, make a significant contribution to the development of the national economy. Insufficient stability and a low level of dynamics of insurance development are conditioned by poor capitalization of insurance companies and absence of methodological complex, which would allow to create financial strategy with high degree of efficiency. In the Russian Federation today there are 236 insurance companies, of them 61 are in the Astrakhan region. Every year insurance companies cease their activity due to the license revocation. The study of the insurance market of the Astrakhan region and Russia using modern methods of scientific research, including mathematical models, made it possible to establish the relationship of insurance indicators with GDP and GRP. Studying the developing insurance market allowed to infer about the expediency of using the indicator “depth of the insurance market”. The forecast of this indicator until 2020 was based on the consensus forecast of the Ministry of Economic Development of the Russian Federation. Development of the insurance market and, consequently, the economy of the region and of the country is affected by many factors. The following indicators were considered as factors: dollar rate, price per gram of gold, MICEX index, central rate of the Central Bank of Russia, and the inflation rate. The constructed multifactorial regression model helped to establish the relationship between the volume of insurance premiums of voluntary insurance, the dollar exchange rate and the level of inflation. The given research algorithm can be used in various fields. The worked out forecast of the parameter of depth of insurance market in the Astrakhan region and Russia proved positive tendency in developing regional and Russian insurance market.

scholarly journals Mutual fund herding behavior and investment strategies in Chinese stock market

2018 ◽  
Vol 15 (2) ◽  
pp. 87-95 ◽  
Author(s):  
John Wei-Shan Hu ◽  
Yen-Hsien Lee ◽  
Ying-Chuang Chen
Keyword(s):  
Stock Market ◽  
Mutual Fund ◽  
Investment Strategies ◽  
Chinese Stock Market ◽  
Contrarian Strategy ◽  
Contrarian Strategies ◽  
Low Degree ◽  
High Degree ◽  
The Impact ◽  
The Relationship

This investigation studies the impact of mutual fund herding on the returns achieved by contrarian strategy from 1990 to 2015 in the Chinese stock market. The relationship between the profit gained by the contrarian strategy and the macroeconomic environment is also examined. First, the returns of the contrarian strategy in China’s stock market are found to be significant. Second, most loser stocks with a high degree of mutual fund herding outperform loser stocks with a low degree of mutual fund herding, revealing that the profitability of an investment portfolio depends on the degree of mutual fund herding. Third, investors should buy loser stocks with a high degree of herding and sell winner stocks with a low degree of herding during a two-year formation period, over which zero-cost contrarian strategies yield the significantly highest return. Finally, the payoff of contrarian strategies is positively related to the herding effect and negatively related to macroeconomic variables.

scholarly journals Comparative genomics of Parolsenella catena and Libanicoccus massiliensis: Reclassification of Libanicoccus massiliensis as Parolsenella massiliensis comb. nov.

2019 ◽  
Vol 69 (4) ◽  
pp. 1123-1129 ◽  
Author(s):  
Mitsuo Sakamoto ◽  
Nao Ikeyama ◽  
Takumi Murakami ◽  
Hiroshi Mori ◽  
Masahiro Yuki ◽  
...  
Keyword(s):  
Ribosomal Proteins ◽  
Type Species ◽  
Phylogenetic Trees ◽  
Single Copy ◽  
Content Type ◽  
Monophyletic Cluster ◽  
Link Type ◽  
Relationship Of ◽  
High Degree ◽  
The Relationship

Previous analyses based on 16S rRNA and hsp60 genes indicated that Parolsenella catena and Libanicoccus massiliensis were closely related to each other and formed a monophyletic cluster independent of the related Olsenella species. To clarify the relationship of these two species, we determined the genome sequence of P. catena JCM 31932T and compared it with that already sequenced for L. massiliensis Marseille-P3237T. Phylogenetic trees based on the concatenated 37 single-copy ribosomal proteins or RpoB robustly supported the relationship observed in the previous studies. Digital DNA–DNA hybridization and average nucleotide identity (ANI) values between P. catena JCM 31932T and L. massiliensis Marseille-P3237T were 32.6 and 87.8 %, respectively, indicating that P. catena JCM 31932T and L. massiliensis Marseille-P3237T are independent species. Alignment fraction and ANI values between the two genomes were 0.75 and 88.84 %, respectively, thus indicating that the two species should be classified into the same genus. The number of putative orthologous genes shared between the two genomes was 1321, which was significantly larger than those (482–928) reported between L. massiliensis Marseille-P3237T and other closely related species. In addition, the genome of P. catena JCM 31932T had a high degree of synteny conservation with that of L. massiliensis Marseille-P3237T. On the basis of these findings, we propose that L. massiliensis should be reclassified as Parolsenella massiliensis comb. nov.; the type strain is Marseille-P3237T (=JCM 33000T=CCUG 71182T).

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