scholarly journals NOTES ON THE EARLY STAGES OF CALOPTERON RETICULATUM, Fabr.

1883 ◽  
Vol 15 (5) ◽  
pp. 97-98
Author(s):  
D. W. Coquillett
Keyword(s):  
Outer Edge ◽  
Pale Yellow ◽  
Early Stages ◽  
Original Shape ◽  
Brown Color

On the 10th of July I found a pupa of this species suspended by the hind end of its body beneath a log. The 1arval skin was rent and worked backward, but still retained nearly its original shape and color, and by comparing it with certain larvæ which I have frequently met with in similar situations, there is no doubt in my mind but that these latter belong to the above species.These larvæ very closely resemble that figured by Packard on page 465 of his “Guide” (fig. 432), which in the text on the succeeding page is referred to Photuris. The dried specimens now before me measure about 12 mm., and are of a dull purplish-brown color; venter pale yellow, tinged with pink and marked with a brownish stripe on each outer edge, and with two rows of brown spots, these not extending upon the first three segments; head retractile, dull blackish, the region of the jaws polished brown, and furnished with four black prickles, the upper two of which are placed transversely, the lower two longitudinally.

scholarly journals NOTES ON THE EARLY STAGES OF LIXUS MACER, LeConte

1883 ◽  
Vol 15 (6) ◽  
pp. 113-113
Author(s):  
D. W. Coquillett
Keyword(s):  
Summer Season ◽  
Wild Sunflower ◽  
Pale Yellow ◽  
Early Stages

On the 13th of July, 1881, I saw a female L. macer busily engaged in gnawing holes in the stem of a green Helianthus grosse-serratus (Wild Sunflower). There were several holes in the stem of this plant, and in each I found one or two eggs, of an elliptic-ovoid form, polished pale yellow, and measuring about two and one-fourth mm. in length. In the stems of other similar weeds, which grew near to this one, I found several recently hatched larvæ. I examined the stems of this same kind of weed at intervals throughout the summer season, and found the larvæ in different stages of their growth, sometimes two or three in the same plant. Late in October I noticed that many of these weeds had been broken off, and the pieces—from one and a half to three feet in length—were lying about upon the ground. These pieces contained a larva—evidently of the above species—and at one end, and occasionally at each end, the pith and woody part had been gnawed away, leaving nothing but the bark, and this had evidently been broken off by the wind. I examined a few of these pieces on the 25th of the following April, and found nothing but larvæ another examination was made on the 12th of the following month, when nothing but larvæ were found, but all were dead.

scholarly journals A NEW FORM OF PRIONIA, AND NOTES ON PLATYPTERYX ARCUATA AND P. GENICULA

1893 ◽  
Vol 25 (1) ◽  
pp. 24-24
Author(s):  
George. H. Hudson
Keyword(s):  
Outer Edge ◽  
Ground Colour ◽  
Pale Yellow ◽  
New Form

Prionia levis, n. var. or sp.Primaries without the delicate frosted or silvery appearance, and without the numerous short, fine, strigate, brown lines of bilineata. The brown scales are present, but are uniformly and evenly distributed, save where they form the two brown lines which cross the wing, and a little darker shading near the outer edge and apex. These two transverse lines are about a third wider apart that in bilineata, the second narrowly edged externally with the clear, pale yellow ground-colour of the wing.

scholarly journals PENGARUH MORDAN TERHADAP PENCELUPAN EKSTRAK DAUN PURING (Codiaeum Variegatum) PADA BAHAN KATUN

2019 ◽  
Vol 8 (2) ◽  
pp. 403
Author(s):  
Mela Maha Revianti ◽  
Sri Zulfia Novrita
Keyword(s):  
Synthetic Dyes ◽  
Negative Effects ◽  
Dark Light ◽  
Clam Shell ◽  
Pale Yellow ◽  
Garcinia Xanthochymus ◽  
Codiaeum Variegatum ◽  
Color Value ◽  
Related Sample ◽  
Brown Color

AbstrakPenelitian ini dilatar belakangi sebagai upaya untuk mengurangi dampak negative akibat penggunaan zat warna sintetis. Salah satu tanaman yang dapat dijadikan zat pewarna alam yang ramah lingkungan yaitu tanaman puring. Hasil pewarnaan dengan mordan asam kandis menghasilkan warna Warm Brown, Value cukup terang dan kerataan pada kategori rata, dengan mordan garam menghasilkan warna Pale Cyan, Value cukup gelap dan kerataan pada kategori cukup rata, dengan mordan jeruk nipis menghasilkan warna Warm Brown, Value cukup terang dan kerataan pada kategori cukup rata, dengan mordan kapursirihmenghasilkan100% warna Pale Yellow, Value sangat terang dan kerataan pada kategori kurang rata dan hasil dengan mordan tawas menghasilkan warna Clam Shell Pink dengan Value cukup terang dan kerataan pada kategori sangat rata, Hasil uji Friedman K-Related Sample diperoleh untuk gelap terang warna (Value) adalah 0,000 < 0,05, maka Hₒ ditolak, artinya terdapat pengaruh gelap terang warna yang signifikan dan hasil untuk kerataanwarna, data yang diperoleh adalah 0,000 < 0,05 maka Hₒ ditolak, artinya terdapat pengaruh yang signifikan pada pencelupan ekstrak daun puring (Codiaeum Variegatum) menggunakan mordan asam kandis (Garcinia xanthochymus), garam (Nacl), jeruk nipis (citrus Aurantifolia), kapur sirih (calcium hidroksida) dan tawas pada bahan katun.Kata Kunci: pengaruh, mordan, daun puring.AbstractThis research is motivated as an effort to reduce the negative effects caused by the use of synthetic dyes. One of the plants that can be used as natural coloring agents which is environmentally friendly is croton plant. The results of staining with mordan candis acid produce Warm Brown color, Value is quite bright and flatness in the flat category, with mordan salt producing Pale Cyan color, Value is quite dark and flatness in the category is quite flat, with mordan lime produces Warm Brown color, Value is quite bright and evenness in the category is quite flat, with mordan whiting producing Pale Yellow color, Value is very bright and evenness in the uneven category and results with mordan alum produce color Clam Shell Pink with a light enough value and flatness in the very flat category, the Friedman K-Related Sample test results obtained for light dark colors (Value) is 0,000 <0.05, then Hₒ is rejected, meaning that there is a significant effect of dark light colors and results for color flatness, the data obtained is 0,000 <0.05 then Hₒ is rejected, meaning that there is a significant influence on the dyeing of croton leaf extract (CodiaeumVariegatum) m use mordan candis acid (Garcinia xanthochymus), salt (Nacl), lime (citrus Acurantifolia), betel lime (calcium hydroxide) and alum in cotton.Keywords: influence, mordant, croton..

Quasi-Periodic Oscillations in Dwarf Novae

1979 ◽  
Vol 46 ◽  
pp. 77-88
Author(s):  
Edward L. Robinson
Keyword(s):  
Binary Systems ◽  
Outer Edge ◽  
Light Curves ◽  
Close Binary ◽  
Bright Spot ◽  
Dwarf Novae ◽  
Periodic Oscillations ◽  
High Frequencies ◽  
Short Period ◽  
Typical Time

Three distinct kinds of rapid variations have been detected in the light curves of dwarf novae: rapid flickering, short period coherent oscillations, and quasi-periodic oscillations. The rapid flickering is seen in the light curves of most, if not all, dwarf novae, and is especially apparent during minimum light between eruptions. The flickering has a typical time scale of a few minutes or less and a typical amplitude of about .1 mag. The flickering is completely random and unpredictable; the power spectrum of flickering shows only a slow decrease from low to high frequencies. The observations of U Gem by Warner and Nather (1971) showed conclusively that most of the flickering is produced by variations in the luminosity of the bright spot near the outer edge of the accretion disk around the white dwarf in these close binary systems.

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

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