scholarly journals Intra‐Alpine Islands: Population genomic inference reveals high degree of isolation between freshwater spring habitats

2021 ◽  
Author(s):  
Lucas Blattner ◽  
Kay Lucek ◽  
Nathanael Beck ◽  
Daniel Berner ◽  
Stefanie Fumetti
Keyword(s):  
Population Genomic ◽  
Freshwater Spring ◽  
High Degree ◽  
Degree Of Isolation

Two new species of the genera Acerastes and Messatoporus (Hymenoptera: Ichneumonidae: Cryptini) from Mexico

2021 ◽  
Vol 30 (2) ◽  
pp. 331-338
Author(s):  
D.R. Kasparyan
Keyword(s):  
New Species ◽  
Neotropical Species ◽  
Two New Species ◽  
High Degree ◽  
North And South ◽  
Degree Of Isolation

Two species of the tribe Cryptini (Hymenoptera: Icneumonidae: Cryptinae), Acerastes nervellatus sp. nov. and Messatoporus atratus sp. nov., are described from Mexico. It is shown that Neotropical species of the genera Messatoporus Cushman, 1929 (90 species) and Polycyrtus Spinola, 1840 (155 species) in North and South Americas are mostly different, and only 2–6% of the species of these genera occur in both faunas. It suggests a high degree of isolation of these faunas from each other.

Time for concern: is the health of Antarctica's wildlife in danger?

1995 ◽  
Vol 7 (4) ◽  
pp. 343-343 ◽  
Author(s):  
Knowles Kerry ◽  
Judy Clarke
Keyword(s):  
Cross Infection ◽  
Antarctic Ecosystem ◽  
Wide Range ◽  
Antarctic Seals ◽  
In The Wild ◽  
Cross Immunity ◽  
High Degree ◽  
The Antarctic ◽  
Degree Of Isolation ◽  
Adélie Penguins

The high degree of isolation of Antarctica may well have protected its seals and birds from many of the diseases found in related species outside the continent. Our recent review of diseases in penguins has shown that birds taken into captivity are susceptible to a wide range of diseases, many of which have not been recorded in the wild. The same situation presumably applies to Antarctic seals. Adélie penguins in Antarctica have been shown to have antibodies to Newcastle disease virus, avian influenza virus and the Chlamydia group of bacteria. From this we could infer that wild birds have had contact with these diseases but, in the cases of viral diseases at least, a more likely explanation could be that the antibodies are the result of cross-infection with related but benign viral strains. There is no evidence to date that any major exotic diseases have been introduced into the Antarctic ecosystem. However, unless non-pathogenic strains are present to provide cross-immunity, all birds and seals are likely to be highly susceptible to such introductions.

scholarly journals Foraging density for squirrel monkey Saimiri sciureus in two forests in Puerto Lopez - Colombia

2014 ◽  
pp. 4158-4167 ◽  
Author(s):  
Jorge Astwood R ◽  
José Rodríguez P ◽  
Karen Rodríguez-C
Keyword(s):  
Food Source ◽  
Squirrel Monkeys ◽  
Saimiri Sciureus ◽  
Ecological Problem ◽  
Natural Environments ◽  
Mauritia Flexuosa ◽  
Forest Remnants ◽  
Density Values ◽  
High Degree ◽  
Degree Of Isolation

ABSTRACTObjective. Forest remnants were analyzed to determine the density of squirrel monkeys (Saimiri sciureus) and the degree of alteration of the forest, by selecting areas for the conservation and maintenance of the species in natural environments. Materials and methods. Linear transects were conducted on two wooden fragments, “La Reforma” and “Campo Hermoso” farms (Puerto Lopez, Meta, Colombia), recording sightings of squirrel monkeys and identifying the tree species used by the primates. Results. The fragments studied correspond to trails at the edge of water bodies with low connectivity. Highest density values were observed on the second transect of La Reforma, a possible consequence of an overcrowding phenomenon due to the high degree of isolation of the fragment. The species preferentially used as refuge and food source were: Bellucia grossularioides, Eugenia jambos, Inga alba, Mauritia flexuosa, Pseudolmedia laevis and Rollinia edulis. Conclusions. The phenology of the plant species allows for a dynamic food supply, considering the constant availability of food for the primates. Therefore, despite the evident ecological problem of these forests, it is possible to use active restoration programs to strengthen the existing dynamics and balance the biogeochemical dynamics of the ecosystem, so that socioeconomic human activities are not in conflict with conservation efforts and vice versa.

scholarly journals Legal and Ethical Issues Regarding Minors in the Italian Coronavirus Flu Emergency

2021 ◽  
Vol 9 ◽  
Author(s):  
Piergiorgio Fedeli ◽  
Nunzia Cannovo ◽  
Roberto Scendoni ◽  
Mariano Cingolani
Keyword(s):  
Young People ◽  
Severe Acute Respiratory Syndrome ◽  
Ethical Issues ◽  
Psychological Problems ◽  
Age Group ◽  
Italian Government ◽  
The Moment ◽  
High Degree ◽  
Degree Of Isolation ◽  
Legal And Ethical Issues

On February 21, 2020, Italy became one of the countries hit by an epidemic of the new coronavirus that causes “severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2). Even a month before that, however, the Italian government began issuing a series of decrees and ordinances aimed at the containment of the virus in Italy, the first of them on January 25, 2020. The COVID 19 infection has been faced as an epidemic through measures to enforce a high degree of isolation. These regulations hold for minors, as well, with consequent difficulties for this age group. While at the moment young people appear to be the least vulnerable to the severe complications of COVID 19, the psychological problems that may be brought on by pandemic-related restrictions should be taken into serious consideration.

scholarly journals Compact MIMO Slots Antenna Design with Different Bands and High Isolation for 5G Smartphone Applications

2020 ◽  
Vol 16 (4(Suppl.)) ◽  
pp. 1093
Author(s):  
Ayman mohammed Ibrahim
Keyword(s):  
Correlation Coefficient ◽  
Return Loss ◽  
Antenna Design ◽  
Smartphone Applications ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
Chinese Markets ◽  
High Degree ◽  
Degree Of Isolation ◽  
Envelope Correlation

 In this paper, two elements of the multi-input multi-output (MIMO) antenna had been used to study the five (3.1-3.55GHz and 3.7-4.2GHz), (3.4-4.7 GHz), (3.4-3.8GHz) and (3.6-4.2GHz) 5G bands of smartphone applications that is to be introduced to the respective US, Korea, (Europe and China) and Japan markets. With a proposed dimension of 26 × 46 × 0.8 mm3, the medium-structured and small-sized MIMO antenna was not only found to have demonstrated a high degree of isolation and efficiency, it had also exhibited a lower level of envelope correlation coefficient and return loss, which are well-suited for the 5G bands application. From the fabrication of an inexpensive FR4 substrate with a 0.8 mm thickness level, a loss tangent of 0.035 and a dielectric constant of 4.3, the proposed MIMO antennas that had been simulated under the five different band coverage were discovered to have demonstrated a respective isolation level of about 14dB, 12dB, 21.5dB, 19dB and 20dB under a -10dB impendence bandwidth. In the measurement and fabrication outcomes that were derived from the use of the prototype MIMO in the (3.4-3.8) band of the Europe and Chinese markets, the proposed MIMO was thus found to have produced a better performance in terms of efficiency, isolation, and envelope correlation coefficient (ECC).

Tissue section lifting for electron microscopy

1978 ◽  
Vol 36 (2) ◽  
pp. 86-87
Author(s):  
Adrian F. van Dellen
Keyword(s):  
Infectious Disease ◽  
Electron Microscopy ◽  
Tissue Culture ◽  
Organ System ◽  
Surrounding Tissue ◽  
Paraffin Sections ◽  
Surface Areas ◽  
Specific Determination ◽  
High Degree ◽  
Accuracy And Repeatability

The morphologic pathologist may require information on the ultrastructure of a non-specific lesion seen under the light microscope before he can make a specific determination. Such lesions, when caused by infectious disease agents, may be sparsely distributed in any organ system. Tissue culture systems, too, may only have widely dispersed foci suitable for ultrastructural study. In these situations, when only a few, small foci in large tissue areas are useful for electron microscopy, it is advantageous to employ a methodology which rapidly selects a single tissue focus that is expected to yield beneficial ultrastructural data from amongst the surrounding tissue. This is in essence what "LIFTING" accomplishes. We have developed LIFTING to a high degree of accuracy and repeatability utilizing the Microlift (Fig 1), and have successfully applied it to tissue culture monolayers, histologic paraffin sections, and tissue blocks with large surface areas that had been initially fixed for either light or electron microscopy.

Electron Microscopy in Molecular Biology

1967 ◽  
Vol 25 ◽  
pp. 2-3
Author(s):  
Cecil E. Hall
Keyword(s):  
Electron Microscopy ◽  
Molecular Biology ◽  
Noise Level ◽  
Molecular Structures ◽  
Material Structure ◽  
The Arts ◽  
Shadow Casting ◽  
Electron Image ◽  
High Degree ◽  
Very High

The visualization of organic macromolecules such as proteins, nucleic acids, viruses and virus components has reached its high degree of effectiveness owing to refinements and reliability of instruments and to the invention of methods for enhancing the structure of these materials within the electron image. The latter techniques have been most important because what can be seen depends upon the molecular and atomic character of the object as modified which is rarely evident in the pristine material. Structure may thus be displayed by the arts of positive and negative staining, shadow casting, replication and other techniques. Enhancement of contrast, which delineates bounds of isolated macromolecules has been effected progressively over the years as illustrated in Figs. 1, 2, 3 and 4 by these methods. We now look to the future wondering what other visions are waiting to be seen. The instrument designers will need to exact from the arts of fabrication the performance that theory has prescribed as well as methods for phase and interference contrast with explorations of the potentialities of very high and very low voltages. Chemistry must play an increasingly important part in future progress by providing specific stain molecules of high visibility, substrates of vanishing “noise” level and means for preservation of molecular structures that usually exist in a solvated condition.

A High Angle, Double Tilting Cold Stage for the AEI EM7

1974 ◽  
Vol 32 ◽  
pp. 450-451
Author(s):  
P.R. Swann ◽  
A.E. Lloyd
Keyword(s):  
Habit Plane ◽  
Temperature Control ◽  
Tilt Angle ◽  
Cooling System ◽  
Thermal Drift ◽  
High Angle ◽  
Cold Stage ◽  
High Degree ◽  
Better Than

Figure 1 shows the design of a specimen stage used for the in situ observation of phase transformations in the temperature range between ambient and −160°C. The design has the following features a high degree of specimen stability during tilting linear tilt actuation about two orthogonal axes for accurate control of tilt angle read-out high angle tilt range for stereo work and habit plane determination simple, robust construction temperature control of better than ±0.5°C minimum thermal drift and transmission of vibration from the cooling system.

New Aspects in the Design of Electron Optical Magnification Systems

1972 ◽  
Vol 30 ◽  
pp. 606-607
Author(s):  
Willem H.J. Andersen
Keyword(s):  
Electron Microscope ◽  
Imaging System ◽  
Chromatic Aberration ◽  
Research Tool ◽  
Energy Losses ◽  
Objective Lens ◽  
Theoretical Limit ◽  
Optical Magnification ◽  
Chromatic Aberrations ◽  
High Degree

Electron microscope design, and particularly the design of the imaging system, has reached a high degree of perfection. Present objective lenses perform up to their theoretical limit, while the whole imaging system, consisting of three or four lenses, provides very wide ranges of magnification and diffraction camera length with virtually no distortion of the image. Evolution of the electron microscope in to a routine research tool in which objects of steadily increasing thickness are investigated, has made it necessary for the designer to pay special attention to the chromatic aberrations of the magnification system (as distinct from the chromatic aberration of the objective lens). These chromatic aberrations cause edge un-sharpness of the image due to electrons which have suffered energy losses in the object.There exist two kinds of chromatic aberration of the magnification system; the chromatic change of magnification, characterized by the coefficient Cm, and the chromatic change of rotation given by Cp.

Cytoplasmic Organization in the Receptor Cells of the Crista Ampullaris

1972 ◽  
Vol 30 ◽  
pp. 60-61 ◽  
Author(s):  
Robert F. Dunn
Keyword(s):  
Fine Particles ◽  
Apical Cell ◽  
Apical Region ◽  
Receptor Cells ◽  
Cuticular Plate ◽  
Morphological Organization ◽  
Crista Ampullaris ◽  
Cytoplasmic Organization ◽  
High Degree ◽  
General Appearance

Receptor cells of the cristae in the vestibular labyrinth of the bullfrog, Rana catesbiana, show a high degree of morphological organization. Four specialized regions may be distinguished: the apical region, the supranuclear region, the paranuclear region, and the basilar region.The apical region includes a single kinocilium, approximately 40 stereocilia, and many small microvilli all projecting from the apical cell surface into the lumen of the ampulla. A cuticular plate, located at the base of the stereocilia, contains filamentous attachments of the stereocilia, and has the general appearance of a homogeneous aggregation of fine particles (Fig. 1). An accumulation of mitochondria is located within the cytoplasm basal to the cuticular plate.

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