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Author  |
Ashfaq, M.; Khanam, S.; Khan, M.; Rasheed, F.; Hafeez, S. |
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Title |
Insect orientation to various color lights in the agricultural biomes of Faisalabad |
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Journal Article |
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Year |
2005 |
Publication |
Pakistan Entomologist |
Abbreviated Journal |
Pak Entomol |
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Volume |
27 |
Issue |
1 |
Pages |
49-52 |
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Keywords |
Animals; Insects; Faisalabad; Pakistan; Diptera; Coleoptera; Lepidoptera |
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Abstract |
This experiment was conducted in the area of Punjab Agriculture Research Station (PARS) and Chak No.33 JB Faisalabad to evaluate the response insects to varying wavelengths of light. During experiment, lights of six different colors (blue, green, yellow, red, black and white) were tested. All lights were arranged in a line on agriculture land, close to Faisalabad Airport. Tree rows/blocks, forest nursery, fruit garden, wheat, maize and fodder crops were the main vegetative covers in the vicinity. Each selected color light was properly projected on 1 m^2
vertical screen (made of white cotton fabric) placed one meter high above the ground. All lights were kept on simultaneously for half an hour and the insects attracted on both sides of the screens were collected in tubs containing soapy water. At the end of experiment, the collection was shifted to properly labeled storage bottles for counting and identification into respective orders. The
highest number of insects was observed in container placed under black light (ultraviolet light), while the lowest in that of red light. Similarly, the common insect orders frequented among all color lights were Diptera, Coleoptera and
Lepidoptera respectively. The experimental results indicated that insects are attracted in more number on lights with short wavelengths and high frequencies and vice a versa. |
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Department of Agri Entomology, University of Agriculture, Faisalabad, Pakistan |
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Pakistan Entomological Society |
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English |
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English |
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1017-1827 |
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IDA @ john @ |
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1477 |
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Author |
Ashford, O.M. |
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Title |
A portable cloud searchlight |
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Journal Article |
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Year |
1947 |
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Weather |
Abbreviated Journal |
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2 |
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103-104 |
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Keywords |
Remote Sensing |
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GFZ @ kyba @ |
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2044 |
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Author |
Ashkenazi, I. E.; Reinberg, A,; Bicakova-Rocher, A.; Ticher, A. |
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Title |
The genetic background of individual variations of circadian-rhythm periods in healthy human adults. |
Type |
Journal Article |
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Year |
1993 |
Publication |
American Journal of Human Genetics |
Abbreviated Journal |
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Volume |
52 |
Issue |
6 |
Pages |
1250–1259 |
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Keywords |
Human Health; Adult; Body Temperature; Bronchi; Bronchi: physiology; Circadian Rhythm; Circadian Rhythm: genetics; Female; Genetic Variation; Hand; Hand: physiology; Heart Rate; Humans; Male; Middle Aged; Sex Factors; Sleep |
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Abstract |
As a group phenomenon, human variables exhibit a rhythm with a period (tau) equal to 24 h. However, healthy human adults may differ from one another with regard to the persistence of the 24-h periods of a set of variables' rhythms within a given individual. Such an internal desynchronization (or individual circadian dyschronism) was documented during isolation experiments without time cues, both in the present study involving 78 male shift workers and in 20 males and 19 females living in a natural setting. Circadian rhythms of sleep-wake cycles, oral temperature, grip strength of both hands, and heart rate were recorded, and power-spectra analyses of individual time series of about 15 days were used to quantify the rhythm period of each variable. The period of the sleep-wake cycle seldom differed from 24 h, while rhythm periods of the other variables exhibited a trimodal distribution (tau = 24 h, tau > 24 h, tau < 24 h). Among the temperature rhythm periods which were either < 24 h or > 24 h, none was detected between 23.2 and 24 h or between 24 and 24.8 h. Furthermore, the deviations from the 24-h period were predominantly grouped in multiples of +/- 0.8 h. Similar results were obtained when the rhythm periods of hand grip strength were analyzed (for each hand separately). In addition, the distribution of grip strength rhythm periods of the left hand exhibited a gender-related difference. These results suggested the presence of genetically controlled variability. Consequently, the distribution pattern of the periods was analyzed to elucidate its compatibility with a genetic control consisting of either a two-allele system, a multiple-allele system, or a polygenic system. The analysis resulted in structuring a model which integrates the function of a constitutive (essential) gene which produces the exact 24-h period (the Dian domain) with a set of (inducible) polygenes, the alleles of which, contribute identical time entities to the period. The time entities which affected the rhythm periods of the variables examined were in the magnitude of +/- 0.8 h. Such an assembly of genes may create periods ranging from 20 to 28 h (the Circadian domain). The model was termed by us “The Dian-Circadian Model.” This model can also be used to explain the beat phenomena in biological rhythms, the presence of 7-d and 30-d periods, and interindividual differences in sensitivity of rhythm characteristics (phase shifts, synchronization, etc.) to external (and environmental) factors. |
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LoNNe @ schroer @ |
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582 |
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Author |
Assum, T.; Bjørnskau, T.; Fosser, S.; Sagberg, F. |
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Title |
Risk compensation--the case of road lighting |
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Journal Article |
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Year |
1999 |
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Accident Analysis & Prevention |
Abbreviated Journal |
Accident Analysis & Prevention |
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31 |
Issue |
5 |
Pages |
545-553 |
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Keywords |
Lighting |
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The hypothesis of this article is that drivers will not adjust their behavior, i.e. drivers are not expected to increase their speed, reduce their concentration or travel more when road lighting is installed. The hypothesis was based on previous research showing that road lighting reduces road accidents and that average driving speeds do not increase when road lighting is installed. Our results show that drivers do compensate for road lighting in terms of increased speed and reduced concentration. Consequently, the hypothesis is rejected. This means that road lighting could have a somewhat larger accident-reducing effect, if compensation could be avoided. The fact that previous research has found no change in average speed when road lighting is introduced, seems to be explained by increased driving speeds by some drivers being counterbalanced by a larger proportion of more slowly driving groups of drivers (elderly people and women), i.e. different subgroups of road users compensate in different ways. |
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0001-4575 |
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LoNNe @ kagoburian @ |
Serial |
625 |
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Author |
Atasever, M.; Bozkurt, Y. |
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Title |
Effect of Different Photoperiod Regimes on Sperm Quality, Fecundity and Fertilization in Rainbow Trout (Oncorhynchus mykiss) |
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Journal Article |
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Year |
2015 |
Publication |
Turkish Journal of Fisheries and Aquatic Sciences |
Abbreviated Journal |
Turk. J. Fish. Aquat. Sci. |
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15 |
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517-523 |
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Keywords |
animals, fish, photoperiod, sperm, ovulation, fertilization, Oncorhynchus mykiss |
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Abstract |
The present study was carried out to determine effect of different photoperiod regimes on sperm quality parameters,
ovulation/spermiation time and hatchery performance of rainbow trout (Oncorhynchus mykiss) broodstock. The designation
was done as combination of different long and short photoperiod regimes such as: 18L:6D and 18D:6L (group I); 14L:10D
and 14D:10L (group II) and natural lighting (control group). All treatments were carried out as three replications at each
group.
As a result, the highest mean spermatozoa motility (83.0±2.1 %) and motility period (67.2±6.3 s) were determined in
control group. It was determined that the longest ovulation was occured in female rainbow trout broodstock at 265 days in
group I. Although the highest mean absolute egg productivity was determined as 3654.7±298.3 eggs/fish in group I, the
highest mean relative egg productivity was determined as 137.3±24.5 eggs/kg in control group. Furthermore, the highest mean
egg diameter (4.6±0.1 mm) and fertilization rate (87.0±2.5 %) were determined in control group. Statistical analyses revealed
that spermatozoa motility, spermatozoa motility period and spermatozoa density positively correlated with fertilization rate in
all photoperiod regimes (P>0.05). On the other hand, semen volume and semen pH negatively correlated with fertilization rate
in all photoperiod regimes (P>0.05). It is interesting to note that only statistically important positive correlation was
determined between relative fecundity and fertilization rate in 18L:6D/18D:6L photoperiod regime (r=0.452, P<0.05).
Consequently, results revealed that combined long and short artificial photoperiod regimes can advance ovulation and
spermiation and also can effect gamete quality and hatchery performance of rainbow trout during out-of-season spawning. |
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LoNNe @ schroer @ |
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1570 |
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