A TIMING TRAP FOR SEGREGATING CATCHES OF INSECTS BY DISCRETE INTERVALS

1981 ◽  
Vol 113 (8) ◽  
pp. 765-768 ◽  
Author(s):  
Helmut Riedl ◽  
B. A. Croft
Keyword(s):  
Flight Activity ◽  
Weather Factors ◽  
Clock Speed ◽  
Olfactory Stimuli ◽  
Female Attraction ◽  
Metal Disk ◽  
Physical And Chemical

Timing traps are widely used to study the diurnal flight activity of insects, their response rhythms to physical and chemical (olfactory) stimuli, and the effect of weather factors on these behaviors. Goetz (1941) used an adhesive-coated horizontal metal disk driven by a mechanical clock to determine the periodicity of male-female attraction in two lepidopterous species on grapes. The area of the disk exposed at any time corresponded to a 1-h sector of the clock dial. The disk completed a full revolution every 12 h and therefore the trap had to be checked twice a day. Also, since the clock speed was not variable, the trapping interval could only be adjusted by decreasing or increasing the opening to the sticky disk.

scholarly journals Seasonal and weather factors influencing the annual flight cycle of Prostephanus truncatus (Coleoptera: Bostrichidae) and its predator Teretriosoma nigrescens (Coleoptera: Histeridae) in Benin

1997 ◽  
Vol 87 (3) ◽  
pp. 239-246 ◽  
Author(s):  
C. Borgemeister ◽  
W. G. Meikle ◽  
D. Scholz ◽  
C. Adda ◽  
P. Degbey ◽  
...  
Keyword(s):  
Host Plants ◽  
Regression Coefficient ◽  
Flight Activity ◽  
Prostephanus Truncatus ◽  
Weather Variables ◽  
Weather Factors ◽  
Factors Influencing ◽  
Accumulated Rainfall ◽  
Woody Host ◽  
Teretriosoma Nigrescens

AbstractInvestigations were carried out in southern Benin on the annual flight cycle and the effects of weather variables on the flight activity of Prostephanus truncatus (Horn) and its natural enemy, Teretriosoma nigrescens Lewis. Two seasonal peaks in flight activity of P. truncatus were observed, one between the end of December and the beginning of January and a second one between May and June. Teretriosoma nigrescens showed a single delayed peak in June, approximately six weeks after the major peak of P. truncatus. Flight activity of P. truncatus was only weakly associated with weather characteristics (standardized regression coefficient for mean daily temperature b = 0.18, t = 2.87, P < 0.05)), whereas for T. nigrescens it was associated with precipitation (standardized regression coefficient for accumulated rainfall during the trapping period b = 0.38, t = 4.76, P < 0.05). The possibility that one of the P. truncatus peaks was associated with dispersal from crowded maize stores and the other with the search for natural woody host plants is discussed.

scholarly journals Моніторинг фізико-хімічних показників морської води прибережної ділянки акваторії Одеської затоки при визначенні відповідного місця розташування вольєрів для утримання морських ссавців

2017 ◽  
Vol 19 (73) ◽  
pp. 183-186
Author(s):  
S.V. Mazovskaya
Keyword(s):  
Black Sea ◽  
Salt Water ◽  
Research Work ◽  
Armed Forces ◽  
Negative Influence ◽  
The Black Sea ◽  
Winter Period ◽  
Weather Factors ◽  
Marine Animals ◽  
Physical And Chemical

In the article data physical and chemical indexes of salt water in the aquatorium of the Odesa Bay in the last few years are presented in the dynamics. Researches were conducted in accordance with the subjects of research work of «Research of parameters of environment for maintenance of marine animals in the conditions of aquatorium of the Odesa Bay in interests of MNF of Armed forces of Ukraine» of the Scientific research center of Armed forces of Ukraine «State Oceanarium» and on the basis of the official figures given by the «Odessa regional laboratory center of state sanitary and epidemiological service of Ukraine». Examining possibility of maintenance of dolphins and sea lions in the conditions of aquatorium of the Odesa Bay, it is necessary to take into account that among the basic sources of contamination of this area of the Black Sea along the coastal channels of river waters of Dnepr and South Bug, there is domestic wastewater from stations of biological purification of water «Southern» and «Northern», thundershower flows of cities Odessa and Chernomorsk, of objects Odessa, South and Black Sea ports, dockyard «Ukraine» and other coastal objects. Also, as catalysts of negative influence on the ecosystem of the Black sea, the unfavorable weather factors of this area of coast can be considered, namely: high temperature of salt water in summer months, periodic high winds, possible formation of ice in a winter period of and other. The aim of the advanced study became the monitoring of separate areas of coast of the Odesa bay on the basic physical and chemical, and also bacteriological indexes of salt water and changes of weather terms during a year for determining the optimal location of maintenance of marine animals in open-air cages. It is set on results researches, that only seasonal maintenance of marine mammals in open-air cages in the aquatorium of the Odesa Bay (during 6–8 months of the year) can be applied, by reason of disparity of row of sanitary epidemiology indexes of salt water to the set rules and norms. One of variants of decision of this question, the combined type of maintenance of animals was offered, that consists in translation of them in the apartment of the covered pool with the natural cleared salt water on the periods of disparity of salt water to the basic sanitary epidemiology requirements or at formation of ice in an aquatorium in a winter period.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Biophysical Measurement of Molecular Weight of Foot-and-Mouth Disease RNA Fragments

1974 ◽  
Vol 32 ◽  
pp. 262-263
Author(s):  
Sydney S. Breese ◽  
Howard L. Bachrach
Keyword(s):  
Chemical Properties ◽  
Foot And Mouth Disease ◽  
Mouth Disease ◽  
Distilled Water ◽  
Bovine Plasma ◽  
Mouth Disease Virus ◽  
Foot And Mouth ◽  
Carbon Coated ◽  
Rna Fragments ◽  
Physical And Chemical

Continuing studies on the physical and chemical properties of foot-and-mouth disease virus (FMDV) have included electron microscopy of RNA strands released when highly purified virus (1) was dialyzed against demlneralized distilled water. The RNA strands were dried on formvar-carbon coated electron microscope screens pretreated with 0.1% bovine plasma albumin in distilled water. At this low salt concentration the RNA strands were extended and were stained with 1% phosphotungstic acid. Random dispersions of strands were recorded on electron micrographs, enlarged to 30,000 or 40,000 X and the lengths measured with a map-measuring wheel. Figure 1 is a typical micrograph and Fig. 2 shows the distributions of strand lengths for the three major types of FMDV (A119 of 6/9/72; C3-Rezende of 1/5/73; and O1-Brugge of 8/24/73.

Radiation-induced surface decomposition

1983 ◽  
Vol 41 ◽  
pp. 368-369
Author(s):  
M. L. Knotek
Keyword(s):  
Ionizing Radiation ◽  
Atomic Structure ◽  
Chemical Bonding ◽  
Neutral Species ◽  
Radiation Induced ◽  
Physical And Chemical ◽  
Surface Decomposition ◽  
The Relationship ◽  
Electron And Photon ◽  
Surface Bond

Modern surface analysis is based largely upon the use of ionizing radiation to probe the electronic and atomic structure of the surfaces physical and chemical makeup. In many of these studies the ionizing radiation used as the primary probe is found to induce changes in the structure and makeup of the surface, especially when electrons are employed. A number of techniques employ the phenomenon of radiation induced desorption as a means of probing the nature of the surface bond. These include Electron- and Photon-Stimulated Desorption (ESD and PSD) which measure desorbed ionic and neutral species as they leave the surface after the surface has been excited by some incident ionizing particle. There has recently been a great deal of activity in determining the relationship between the nature of chemical bonding and its susceptibility to radiation damage.

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

Characterization of defects in tabular silver halide grains

1990 ◽  
Vol 48 (4) ◽  
pp. 1046-1047
Author(s):  
C. Goessens ◽  
D. Schryvers ◽  
J. Van Landuyt ◽  
A. Verbeeck ◽  
R. De Keyzer
Keyword(s):  
Radiation Damage ◽  
Silver Halide ◽  
Chemical Characteristics ◽  
X Ray ◽  
Free Region ◽  
Central Defect ◽  
Crystallographic Defects ◽  
Physical And Chemical ◽  
Two Sides

Silver halide grains (AgX, X=Cl,Br,I) are commonly recognized as important entities in photographic applications. Depending on the preparation specifications one can grow cubic, octahedral, tabular a.o. morphologies, each with its own physical and chemical characteristics. In the present study crystallographic defects introduced by the mixing of 5-20% iodide in a growing AgBr tabular grain are investigated. X-ray diffractometry reveals the existence of a homogeneous Ag(Br1-xIx) region, expected to be formed around the AgBr kernel. In fig. 1 a two-beam BF image, taken at T≈100 K to diminish radiation damage, of a triangular tabular grain is presented, clearly showing defect contrast fringes along four of the six directions; the remaining two sides show similar contrast under relevant diffraction conditions. The width of the central defect free region corresponds with the pure AgBr kernel grown before the mixing with I. The thickness of a given grain lies between 0.15 and 0.3 μm: as indicated in fig. 2 triangular (resp. hexagonal) grains exhibit an uneven (resp. even) number of twin interfaces (i.e., between + and - twin variants) parallel with the (111) surfaces. The thickness of the grains and the existence of the twin variants was confirmed from CTEM images of perpendicular cuts.

Sign in / Sign up

Export Citation Format

Share Document