Some Effects of Various Food Plants on Melanoplus mexicanus mexicanus (Sauss.) (Orthoptera: Acrididae)

1952 ◽  
Vol 84 (4) ◽  
pp. 113-117 ◽  
Author(s):  
D. S. Smith ◽  
R. H. Handford ◽  
W. Chefurka
Keyword(s):  
Recent Work ◽  
Food Plants ◽  
Single Plant ◽  
Large Numbers

The long-held belief that grasshoppers are to a large extent omnivorous and, as Wolcott (1936) states, “like cows, feed on any kind of vegetation”, is slowly giving place to the view that they are much more restricted feeders. Their habit of nibbling at almost anything, particularly when they are present in large numbers, probably led to this erroneous concept. More recent work such as that of Rubtzov (1931), Criddle (1933), and Isely (1938, 1944, 1916) stresses the fact that many species of grasshopper confine their feeding to a group of related plants, and a few species to a single plant.

A Critical Examination of the Stock Velocity Survey

1984 ◽  
Vol 88 ◽  
pp. 231-239
Author(s):  
Wayne Osborn ◽  
D.J. MacConnell
Keyword(s):  
Recent Work ◽  
Large Scale ◽  
Practical Problem ◽  
Large Magellanic Cloud ◽  
Radial Velocities ◽  
Critical Examination ◽  
Cluster Membership ◽  
Large Numbers ◽  
Observational Technique ◽  
Objective Prism

The possibility of determining stellar radial velocities for large numbers of stars from objective-prism plates was recognized soon after objective-prism spectroscopy became a common observational technique ; (Pickering, 1887). However, the initial investigations quickly revealed a serious practical problem: how does one determine the rest wavelength position in slitless spectra? This difficulty caused the objective-prism method of obtaining radial velocities to be neglected for many years. It was not until the second half of this century that the method saw a large-scale application. This was the work of Fehrenbach who developed a technique based on a specially designed zero-deviation prism, and successfully used it to isolate members of the Large Magellanic Cloud from foreground field stars (Fehrenbach 1947a, 1947b, 1948; Fehrenbach and Duflot 1970). The Fehrenbach technique has since been applied in a number of other studies; one can mention, as examples, recent work on spectroscopie binaries (Gieseking and Karimie 1982), on cluster membership (Gieseking 1980), and on velocity dispersions at intermediate galactic latitudes (Fehrenbach and Burnage 1982).

CURRENT DEVELOPMENTS IN DETECTION OF MICROORGANISMS IN FOODS-CLOSTRIDIUM PERFRINGENS1

1969 ◽  
Vol 32 (11) ◽  
pp. 426-430 ◽  
Author(s):  
Herbert E. Hall
Keyword(s):  
Recent Work ◽  
Clostridium Perfringens ◽  
Food Poisoning ◽  
Field Trials ◽  
Foodborne Disease ◽  
Direct Examination ◽  
New Approaches ◽  
Cultural Methods ◽  
Serological Examination ◽  
Large Numbers

Recent work on Clostridium perfringens foodborne disease has established that any type, whether classical or “food-poisoning,” may cause illness if present in sufficiently large numbers. Cultural methods for detection and enumeration of the organism have been suggested, and some of these methods have proven satisfactory in field trials. New approaches, such as the cultural or serological examination of patients' feces or the direct examination of foods for toxin content, have been suggested. The problem has been shown to be of sufficient importance to warrant continued and increased study.

TINGITOIDEA AFFECTING COTTON

1934 ◽  
Vol 66 (9) ◽  
pp. 198-199 ◽  
Author(s):  
F. A. Fenton
Keyword(s):  
Lower Surface ◽  
Food Plants ◽  
Cotton Field ◽  
National Museum ◽  
Leaf Injury ◽  
Large Numbers ◽  
Cotton Plants ◽  
Lace Bugs ◽  
Egg Plant

In May, 1933, my attention was drawn to a peculiar leaf injury to young cotton plants at Presidio, Texas. The leaves showed a striking reddish brown spotting from the upper side that at first glance resembled red-spider injury. The damaged plants were quite localized in one section of a large cotton field. Examinaion revealed the presence of large numbers of lace bugs present on the lower surface of the leaves. This species was identified as Gargaphia iridescens Champion by H. G Barber of the U. S. National Museum. Gibson, 1919, records the food plants as Ambrosia, Solanum, Malva, and sand nettle. According to records in the U. S. National Museum, this species has been collected by McMillan at Brownsville, Texas, on Solanum, string beans, and Ambrosia; on egg plant at Olmito, Texas, by McMillan; on Croton texanus at Tucson, Arizona, by W. D. Pierce.

Geophilomorph centipedes and the littoral habitat

2011 ◽  
Vol 4 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Anthony Barber
Keyword(s):  
Recent Work ◽  
Food Source ◽  
Constant Component ◽  
Isolated Populations ◽  
Littoral Habitat ◽  
Large Numbers ◽  
The World ◽  
Anatomical Adaptations ◽  
Marine Littoral ◽  
Littoral Habitats

AbstractMore than 40 species from at least 20 genera in 6 or more families of the Geophilomorpha (Chilopoda) are recorded from marine littoral habitats in various parts of the world. Although there is little recent work on their physiology it seems that they have the capacity to tolerate the osmotic and respiratory regime that is involved and their anatomical adaptations to a burrowing habit and, at least in some cases, their behaviour makes them a fairly constant component of sea-shore ecosystems where they sometimes occur in surprisingly large numbers. It is suggested that the richness of the food source in these habitats, along with other factors such as shelter, microclimate and possibly absence of parasites and/or predators would be the main reason why these now terrestrial animals have re-invaded the seashore so many times since their first appearance in the Palaeozoic. Their tolerance of seawater and occurrence on coasts could lead to passive distribution by rafting and the occurrence of isolated populations could result in genetic differences.

scholarly journals RF and microwave photonic signal processing with Kerr micro-combs

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Signal Processing ◽  
Recent Work ◽  
Microwave Signal ◽  
Hilbert Transforms ◽  
Powerful Source ◽  
Microwave Photonic ◽  
Transversal Filter ◽  
Large Numbers ◽  
High Bandwidth

Abstract Integrated Kerr micro-combs, a powerful source of many wavelengths for photonic RF and microwave signal processing, are particularly useful for transversal filter systems. They have many advantages including a compact footprint, high versatility, large numbers of wavelengths, and wide bandwidths. We present our recent work on photonic RF and microwave high bandwidth temporal signal processing based on Kerr micro-combs with spacings from 49-200GHz. We cover integral and fractional Hilbert transforms, differentiators as well as integrators. The potential of optical micro-combs for RF photonic applications in functionality and ability to realize integrated solutions is also discussed.

What sentimentalists should say about emotion

2019 ◽  
Vol 42 ◽  
Author(s):  
Charlie Kurth
Keyword(s):  
Moral Judgment ◽  
Recent Work ◽  
Relevant Information ◽  
Moral Cognition ◽  
Multilevel Structure

Abstract Recent work by emotion researchers indicates that emotions have a multilevel structure. Sophisticated sentimentalists should take note of this work – for it better enables them to defend a substantive role for emotion in moral cognition. Contra May's rationalist criticisms, emotions are not only able to carry morally relevant information, but can also substantially influence moral judgment and reasoning.

The Sun as a Magnetic Star

1976 ◽  
Vol 32 ◽  
pp. 457-463
Author(s):  
John M. Wilcox ◽  
Leif Svalgaard
Keyword(s):  
Recent Work ◽  
Rotation Axis ◽  
Polar Field ◽  
Magnetic Star ◽  
Rotational Axis ◽  
Field Variation ◽  
The Sun ◽  
Arbitrary Angle ◽  
Solar Magnetism ◽  
Oblique Rotator

SummaryThe sun as a magnetic star is described on the basis of recent work on solar magnetism. Observations at an arbitrary angle to the rotation axis would show a 22-year polar field variation and a 25-day equatorial sector variation. The sector variation would be similar to an oblique rotator with an angle of 90° between the magnetic and rotational axis.

Microstructural comparison of synthetic bioceramics with natural bioceramics

1991 ◽  
Vol 49 ◽  
pp. 38-39
Author(s):  
Shulin Wen ◽  
Jingwei Feng ◽  
A. Krajewski ◽  
A. Ravaglioli
Keyword(s):  
Recent Work ◽  
Human Body ◽  
Human Tissues ◽  
Main Constituent ◽  
Laboratory Furnace ◽  
Chinese Adult ◽  
Human Enamel ◽  
Biological Compatibility ◽  
Synthetic Hydroxyapatite ◽  
Synthetic Work

Hydroxyapatite bioceramics has attracted many material scientists as it is the main constituent of the bone and the teeth in human body. The synthesis of the bioceramics has been performed for years. Nowadays, the synthetic work is not only focused on the hydroapatite but also on the fluorapatite and chlorapatite bioceramics since later materials have also biological compatibility with human tissues; and they may also be very promising for clinic purpose. However, in comparison of the synthetic bioceramics with natural one on microstructure, a great differences were observed according to our previous results. We have investigated these differences further in this work since they are very important to appraise the synthetic bioceramics for their clinic application.The synthetic hydroxyapatite and chlorapatite were prepared according to A. Krajewski and A. Ravaglioli and their recent work. The briquettes from different hydroxyapatite or chlorapatite powders were fired in a laboratory furnace at the temperature of 900-1300°C. The samples of human enamel selected for the comparison with synthetic bioceramics were from Chinese adult teeth.

Cytoplasmic Granules in Lymphocytes from Rats Dosed with SK&F 14336-D

1971 ◽  
Vol 29 ◽  
pp. 556-557
Author(s):  
T. G. Merrill ◽  
B. J. Payne ◽  
A. J. Tousimis
Keyword(s):  
Lipid Storage ◽  
Pokeweed Mitogen ◽  
Electron Microscopic ◽  
Cytoplasmic Granules ◽  
Storage Diseases ◽  
Tay Sachs Disease ◽  
Large Numbers ◽  
Microscopic Studies ◽  
Neurovisceral Lipidosis

Rats given SK&F 14336-D (9-[3-Dimethylamino propyl]-2-chloroacridane), a tranquilizing drug, developed an increased number of vacuolated lymphocytes as observed by light microscopy. Vacuoles in peripheral blood of rats and humans apparently are rare and are not usually reported in differential counts. Transforming agents such as phytohemagglutinin and pokeweed mitogen induce similar vacuoles in in vitro cultures of lymphocytes. These vacuoles have also been reported in some of the lipid-storage diseases of humans such as amaurotic familial idiocy, familial neurovisceral lipidosis, lipomucopolysaccharidosis and sphingomyelinosis. Electron microscopic studies of Tay-Sachs' disease and of chloroquine treated swine have demonstrated large numbers of “membranous cytoplasmic granules” in the cytoplasm of neurons, in addition to lymphocytes. The present study was undertaken with the purpose of characterizing the membranous inclusions and developing an experimental animal model which may be used for the study of lipid storage diseases.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

Sign in / Sign up

Export Citation Format

Share Document