Neutron-produced, short-term radiotracers and activable, stable tracers in ecological studies

1993 ◽  
Vol 167 (2) ◽  
pp. 391-398 ◽  
Author(s):  
R. M. Knaus
Keyword(s):  
Ecological Studies ◽  
Short Term ◽  
Stable Tracers

scholarly journals Jenis-Jenis Reptilia di PPKA Bodogol, Taman Nasional Gunung Gede Pangrango

Jurnal BIOMA ◽  
2014 ◽  
Vol 10 (1) ◽  
pp. 45
Author(s):  
Debby Yuniar ◽  
Hanum Isfaeni ◽  
Paskal Sukandar ◽  
Mohamad Isnin Noer
Keyword(s):  
Key Words ◽  
National Park ◽  
Nature Reserve ◽  
Geographic Range ◽  
Ecological Studies ◽  
Short Term ◽  
Number Species ◽  
Research Studies

Abstract Ecological studies of reptiles in Java were rarely executed during the last decade, because many scientist have focused exclusively on taxonomical studies. Also, studies about diversity of reptiles which have been heretofore published mostly incorporated with amphibians, and nearly all of those studies concerning in unravel the diversity of amphibians. In Bodogol, Gede- Pangrango National Park, survey about reptiles diversity have been done frequently, but just few researches that have been published and most of all were short term research studies. Hence, a research that concern in studying diversity of reptiles become valuable to carry out. Herein, we studied the diversity of reptiles in Bodogol during November 2011 to March 2012. Reptiles’ species were collected by searching in available trail other than Tangkil, Cipanyairan I, and Cipanyairan II. Total of twenty three species of reptiles were found, encompassing six families (Colubridae, Elapidae, Viperidae, Scincidae, Agamidae, and  Gekkonidae).  Number  species of reptiles occured in Bodogol were quite similar to other largest nature reserve areas within the same geographic range (e.g. Halimun-Salak and Ujung Kulon National Park). Despite its small in size, Bodogol contains various types of habitat which therefore could support a variety species of reptiles.   Key words : bodogol, diversity, reptiles, java

Coping with metabolic stress in wild and domesticated animals

1999 ◽  
Vol 24 ◽  
pp. 9-20 ◽  
Author(s):  
C. M. Pond ◽  
E. A. Newsholme
Keyword(s):  
Adipose Tissue ◽  
Metabolic Stress ◽  
Mammary Glands ◽  
Lymphoid Cells ◽  
Glutamine Metabolism ◽  
Ecological Studies ◽  
Short Term ◽  
Competing Demands ◽  
Domestic Livestock

AbstractEthological and ecological studies of wild animals are producing evidence for metabolic stress during courtship, breeding and parental care comparable with that of domestic livestock. Resistance to disease may be compromised by the demand for fatty acids and proteins during reproduction and even more during lactation. The adipose tissue around major lymph nodes is indistinguishable histologically from that in larger depots. In vitro and in vivo studies reveal that it is specialized to respond to lipolytic agonists secreted by lymphoid cells but is insensitive to the endocrine conditions of short-term fasting. These properties enable it to provision adjacent immune cells. Such adipose tissue may act as a forum for competing demands of mammary glands, muscles etc. and local defences against pathogens. Glutamine is essential to the nutrition of the immune system and is used by the mammary gland. Muscle is the best known source but adipose tissue also participates in glutamine metabolism and may become more important in animals in which the musculature is wasted through prolonged lactation.

Testing prediction accuracy in short-term ecological studies

2020 ◽  
Vol 43 ◽  
pp. 77-85 ◽  
Author(s):  
Connor M. Wood ◽  
Zachary G. Loman ◽  
Shawn T. McKinney ◽  
Cynthia S. Loftin
Keyword(s):  
Prediction Accuracy ◽  
Ecological Studies ◽  
Short Term

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Ultrastructural Changes of Canine Kidneys During 24-Hour Perfusion on a LI-400 Preservation System

1971 ◽  
Vol 29 ◽  
pp. 316-317
Author(s):  
M. O. Magnusson ◽  
D. G. Osborne ◽  
T. Shimoji ◽  
W. S. Kiser ◽  
W. A. Hawk
Keyword(s):  
Electron Microscopy ◽  
Electrolyte Solution ◽  
Ultrastructural Changes ◽  
Midline Incision ◽  
Short Term ◽  
Pentobarbital Anesthesia ◽  
Pulsatile Perfusion

Short term experimental and clinical preservation of kidneys is presently best accomplished by hypothermic continuous pulsatile perfusion with cryoprecipitated and millipore filtered plasma. This study was undertaken to observe ultrastructural changes occurring during 24-hour preservation using the above mentioned method.A kidney was removed through a midline incision from healthy mongrel dogs under pentobarbital anesthesia. The kidneys were flushed immediately after removal with chilled electrolyte solution and placed on a LI-400 preservation system and perfused at 8-10°C. Serial kidney biopsies were obtained at 0-½-1-2-4-8-16 and 24 hours of preservation. All biopsies were prepared for electron microscopy. At the end of the preservation period the kidneys were autografted.

Polychlorinated biphenyl induced hepatocyte alterations

1987 ◽  
Vol 45 ◽  
pp. 716-717
Author(s):  
D.N. Collins ◽  
J.N. Turner ◽  
K.O. Brosch ◽  
R.F. Seegal
Keyword(s):  
Lipid Droplets ◽  
Wistar Rats ◽  
Homovanillic Acid ◽  
Polychlorinated Biphenyl ◽  
Corn Oil ◽  
Environmental Pollutants ◽  
Short Term ◽  
Pcb Congeners ◽  
Urinary Levels ◽  
The Brain

Polychlorinated biphenyls (PCBs) are a ubiquitous class of environmental pollutants with toxic and hepatocellular effects, including accumulation of fat, proliferated smooth endoplasmic recticulum (SER), and concentric membrane arrays (CMAs) (1-3). The CMAs appear to be a membrane storage and degeneration organelle composed of a large number of concentric membrane layers usually surrounding one or more lipid droplets often with internalized membrane fragments (3). The present study documents liver alteration after a short term single dose exposure to PCBs with high chlorine content, and correlates them with reported animal weights and central nervous system (CNS) measures. In the brain PCB congeners were concentrated in particular regions (4) while catecholamine concentrations were decreased (4-6). Urinary levels of homovanillic acid a dopamine metabolite were evaluated (7).Wistar rats were gavaged with corn oil (6 controls), or with a 1:1 mixture of Aroclor 1254 and 1260 in corn oil at 500 or 1000 mg total PCB/kg (6 at each level).

Acetaminophen: Macula densa hypersecretory activity by induced hepatotoxicity

1987 ◽  
Vol 45 ◽  
pp. 934-935
Author(s):  
S.S. Poolsawat ◽  
C.A. Huerta ◽  
S.TY. Lae ◽  
G.A. Miranda
Keyword(s):  
Cell Proliferation ◽  
Liver Function ◽  
Chronic Inflammation ◽  
Foam Cell ◽  
Term Effect ◽  
Short Term ◽  
Drug Induced ◽  
Experimental Induction ◽  
Tissue Alterations ◽  
Toxic Responses

Introduction. Experimental induction of altered histology by chemical toxins is of particular importance if its outcome resembles histopathological phenomena. Hepatotoxic drugs and chemicals are agents that can be converted by the liver into various metabolites which consequently evoke toxic responses. Very often, these drugs are intentionally administered to resolve an illness unrelated to liver function. Because of hepatic detoxification, the resulting metabolites are suggested to be integrated into the macromolecular processes of liver function and cause an array of cellular and tissue alterations, such as increased cytoplasmic lysis, centrilobular and localized necroses, chronic inflammation and “foam cell” proliferation of the hepatic sinusoids (1-4).Most experimentally drug-induced toxicity studies have concentrated primarily on the hepatic response, frequently overlooking other physiological phenomena which are directly related to liver function. Categorically, many studies have been short-term effect investigations which seldom have followed up the complications to other tissues and organs when the liver has failed to function normally.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

Short-term volume and turgor regulation in yeast

2008 ◽  
Vol 45 ◽  
pp. 147-160 ◽  
Author(s):  
Jörg Schaber ◽  
Edda Klipp
Keyword(s):  
Dynamic Model ◽  
Volume Change ◽  
Volume Regulation ◽  
Time Course ◽  
Osmotic Shock ◽  
Intracellular Concentration ◽  
Short Term ◽  
Hydrodynamic Property ◽  
Turgor Regulation ◽  
Thermodynamic Framework

Volume is a highly regulated property of cells, because it critically affects intracellular concentration. In the present chapter, we focus on the short-term volume regulation in yeast as a consequence of a shift in extracellular osmotic conditions. We review a basic thermodynamic framework to model volume and solute flows. In addition, we try to select a model for turgor, which is an important hydrodynamic property, especially in walled cells. Finally, we demonstrate the validity of the presented approach by fitting the dynamic model to a time course of volume change upon osmotic shock in yeast.

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