scholarly journals Resin cast impressions as a tool for microscopic observations of fungal epiphytes on leaves

2021 ◽  
pp. 106237
Author(s):  
Cesar U. Valencia ◽  
Gregory A. Sword
Keyword(s):  
Resin Cast

Visual Estimation of Finger Angles: Do we Need Goniometers?

2002 ◽  
Vol 27 (4) ◽  
pp. 382-384 ◽  
Author(s):  
V. ROSE ◽  
C. C. NDUKA ◽  
J. A. PEREIRA ◽  
M. A. PICKFORD ◽  
H. J. C. R. BELCHER
Keyword(s):  
Adult Male ◽  
Hand Surgery ◽  
Percentage Error ◽  
Visual Estimation ◽  
Median Percentage ◽  
Resin Cast

Seventy-one plastic surgeons and therapists, of varying levels of seniority and experience, were asked to examine a resin cast of an adult male hand and use estimation to measure the angles of the metacarpophalangeal and interphalangeal joints of each digit. Visual estimation by all subjects was inaccurate by a mean of approximately 25% (median percentage error 22, range 1–100). Consultants were the most accurate, whilst physiotherapists were the least. Regular goniometer users were no more accurate. However, hand surgery experience correlated with accuracy, as did a stated interest in hand surgery. Although visual accuracy improves with experience, it is still an inaccurate technique. We, therefore, recommend that goniometers should be used for measuring angles in hand surgery patients.

An asymmetrical model of the airways of the dog lung

1982 ◽  
Vol 52 (1) ◽  
pp. 21-26 ◽  
Author(s):  
K. Horsfield ◽  
W. Kemp ◽  
S. Phillips
Keyword(s):  
Input Impedance ◽  
Bronchial Tree ◽  
Physiological Variables ◽  
Resin Cast ◽  
Mean Diameter ◽  
The Difference ◽  
Asymmetrical Model ◽  
Number Of Branches

A resin cast of the bronchial tree of a dog was studied down to branches of 0.5-mm diameter. The branches were ordered, and the number of branches, mean diameter, and mean length of branches in each order were determined. The model was developed from these data with the property that delta, the difference in order between the two daughter branches at a bifurcation, is identical for all parent branches of a given order. This property facilitates the use of the model for the calculation of physiological variables such as input impedance (Fredberg and Hoenig, ASME J. Biomech. Eng. 100: 57–66, 1978), and the comparison of such results with those obtained from symmetrical models (Sidell and Fredberg, ASME J. Biomech. Eng. 100: 131–138, 1978).

Mudslide and/or animal attack are more plausible causes and circumstances of death for AL 288 (‘Lucy'): A forensic anthropology analysis

2018 ◽  
Vol 86 (3) ◽  
pp. 139-142 ◽  
Author(s):  
Phillippe Charlier ◽  
Yves Coppens ◽  
Anaïs Augias ◽  
Saudamini Deo ◽  
Philippe Froesch ◽  
...  
Keyword(s):  
Differential Diagnosis ◽  
Forensic Anthropology ◽  
The Body ◽  
Micro Ct ◽  
Australopithecus Afarensis ◽  
Multiple Impacts ◽  
High Quality ◽  
Bite Marks ◽  
Resin Cast ◽  
Animal Attack

Following a global morphological and micro-CT scan examination of the original and cast of the skeleton of Australopithecus afarensis AL 288 (‘Lucy’), Kappelman et al. have recently proposed a diagnosis of a fall from a significant height (a tree) as a cause of her death. According to topographical data from the discovery site, complete re-examination of a high-quality resin cast of the whole skeleton and forensic experience, we propose that the physical process of a vertical deceleration cannot be the only cause for her observed injuries. Two different factors were involved: rolling and multiple impacts in the context of a mudslide and an animal attack with bite marks, multi-focal fractures and violent movement of the body. It is important to consider a differential diagnosis of the observed fossil lesions because environmental factors should not be excluded in this ancient archaeological context as with any modern forensic anthropological case.

scholarly journals Arterial bifurcations in the cardiovascular system of a rat.

1983 ◽  
Vol 81 (3) ◽  
pp. 325-335 ◽  
Author(s):  
M Zamir ◽  
S M Wrigley ◽  
B L Langille
Keyword(s):  
Cardiovascular System ◽  
Parent Artery ◽  
Two Dimensional ◽  
Arterial Tree ◽  
Resin Cast

Arterial bifurcations in the cardiovascular system of a rat were studied, using a resin cast of the entire arterial tree. At each bifurcation, measurements were made of the diameters of the three vessels involved, the two branching angles, and the angle delta, which the parent artery makes with the plane containing the two branches. The results were found to be consistent with those reported previously in man and monkey. In addition, measurements of delta in the present study indicate that arterial bifurcations are mostly two dimensional.

Hydrodynamic Characteristics of a Swimmer’s Hand

1999 ◽  
Vol 15 (1) ◽  
pp. 3-26 ◽  
Author(s):  
Ross H. Sanders
Keyword(s):  
Entire Range ◽  
Three Dimensional ◽  
Hydrodynamic Characteristics ◽  
Large Contribution ◽  
Towing Tank ◽  
Hand Orientation ◽  
Resin Cast ◽  
Lift Forces ◽  
Direction Opposite

The main purpose of this study was to develop a model for calculating forces produced by a swimmer’s hand, with the thumb adducted, accelerating in the direction of flow. The model included coefficients to account for the velocity and acceleration of the hand. These coefficients were designed to calculate forces in the direction opposite the motion (drag) and two components of lift orthogonal to the direction of motion. To determine the coefficients, three-dimensional forces acting on a resin cast of a swimmer’s hand were recorded while accelerating the hand from rest to 0.45 m · s−1 and 0.6 m · −1 in a towing tank. The hand orientation was varied throughout the entire range at 5° increments. Three-dimensional surfaces describing the magnitude of the coefficients as functions of pitch and sweepback angle were produced. It was found that acceleration coefficients as well as velocity coefficients are required for accurate modeling of the forces produced by the hand in swimming. The forces generated by the hand are greatest when pitch angles approach 90° due to the large contribution by the drag component. However, at pitch angles near 45° and sweepback angles near 45° and 135°, lift forces contribute substantially.

Sign in / Sign up

Export Citation Format

Share Document