The ecology of Oncopera Fasciculata (Walker) (Lepidoptera: Hepialidae) in South Australia. 2. The influence of temperature and moisture on speed of development and survival rate of the eggs.

1956 ◽  
Vol 4 (3) ◽  
pp. 327 ◽  
Author(s):  
PE Madge
Keyword(s):  
Survival Rate ◽  
Field Experiment ◽  
Laboratory Experiments ◽  
Early Stage ◽  
Lethal Dose ◽  
South Australia ◽  
Free Water ◽  
Influence Of Temperature ◽  
Median Lethal Dose

Eggs of the underground grass caterpillar, Oncopera fasciculata (Walker), are laid on the surface of the ground during the spring and may be exposed to desiccation. A field experiment showed that there was a higher survival rate among the eggs and early-stage larvae when eggs were placed under tall, dense herbage. The most likely explanation for this result is that the dense cover protected these stages from dryness and heat. Tall, dense cover is found where improved pastures (herbage consisting of clovers and introduced grasses) have not been heavily grazed or cut for hay. Laboratory experiments showed that the eggs are easily killed by dryness because they lose water rapidly when exposed to evaporation. The median lethal dose for eggs that had completed 15 per cent. of their development was a 43 per cent. loss of water. As the embryo develops, the eggs become more susceptible to loss of water, and water that is lost cannot be regained when free water becomes available.

scholarly journals Percutaneous Toxicity and Decontamination of Soman, Vx, and Paraoxon in Rats Using Detergents

2013 ◽  
Vol 64 (2) ◽  
pp. 211-217 ◽  
Author(s):  
Jan Misík ◽  
Růžena Pavliková ◽  
Kamil Kuča
Keyword(s):  
Survival Rate ◽  
Military Personnel ◽  
Wistar Rats ◽  
Organophosphorus Compounds ◽  
Lethal Dose ◽  
Distilled Water ◽  
Median Lethal Dose ◽  
Agricultural Pesticides ◽  
Male Wistar Rats

Highly toxic organophosphorus compounds (OPs) were originally developed for warfare or as agricultural pesticides. Today, OPs represent a serious threat to military personnel and civilians. This study investigates the in vivo decontamination of male Wistar rats percutaneously exposed to paraoxon and two potent nerve agents - soman (GD) and VX. Four commercial detergents were tested as decontaminants - NeodekontTM, ArgosTM, DermogelTM, and FloraFreeTM. Decontamination performed 2 min after exposure resulted in a higher survival rate in comparison with non-decontaminated controls. The decontamination effectiveness was expressed as protective ratio (PR, median lethal dose of agent in decontaminated animals divided by the median lethal dose of agent in untreated animals). The highest decontamination effectiveness was consistently achieved with ArgosTM (PR=2.3 to 64.8), followed by DermogelTM (PR=2.4 to 46.1). NeodekontTM and FloraFreeTM provided the lowest decontamination effectiveness, equivalent to distilled water (PR=1.0 to 43.2).

The ecology of Oncopera Fasciculata (Walker) (Lepidoptera: Hepialidae) in South Australia. 3. The influence of temperature and moisture on speed of development and survival rate of the Larvae.

1956 ◽  
Vol 4 (3) ◽  
pp. 346 ◽  
Author(s):  
PE Madge
Keyword(s):  
Survival Rate ◽  
Relative Humidity ◽  
South Australia ◽  
Early Summer ◽  
Influence Of Temperature ◽  
Larval Stages ◽  
South Eastern ◽  
First Instar ◽  
Active Feeding ◽  
Unfavourable Weather

In South Australia the underground grass caterpillar, Oncopera fasciculata (Walker), is found only in the higher rainfall area in the south-eastern portion of the State. It appears that the distribution and numbers of this pest of improved pastures are mainly restricted by unfavourable weather (dry and hot) during the egg and early larval stages (late spring-early summer). These stages, as well as older larvae established in subterranean burrows, stand a better chance to survive the dryness and heat where the surface of the ground is covered with dense herbage. Unfed, first-instar larvae are much more susceptible to loss of water than are the eggs. Larvae remain virtually dormant during the summer, but from about April onwards they grow rapidly. The resumption of active feeding and growth is associated with the first substantial autumn rains. During autumn, when the rainfall may be intermittent, the larvae feed more actively during wet periods and become relatively inactive again during dry periods. The relative humidity of the air at the base of a subterranean burrow where the larvae lives was usually above 95 per cent., even when the relative humidity of the air just above the mouth of the burrow was as low as 65 per cent. No measurements were taken during the height of the summer, when the burrows may have been drier than this.

Immunohistochemical expression of p53, bcl-2, and p21WAF1/CIP1 in early cervical carcinoma: Correlation with clinical outcome

2002 ◽  
Vol 12 (3) ◽  
pp. 290-298 ◽  
Author(s):  
M Graflund ◽  
B Sorbe ◽  
M Karlsson
Keyword(s):  
Survival Rate ◽  
Clinical Outcome ◽  
Cervical Carcinoma ◽  
Early Stage ◽  
Tumor Grade ◽  
Figo Stage ◽  
Immunohistochemical Expression ◽  
Cancer Specific Survival ◽  
Term Survival ◽  
Cervical Carcinomas

Abstract.Graflund M, Sorbe B, Karlsson M. Immunohistochemical expression of p53, bcl-2, and p21 WAF1/CIP1 in early cervical carcinoma: Correlation with clinical outcome.The objective of this study was to assess the value of p53, bcl-2, and p21WAF1/CIP1 immunoreactivity as predictors of pelvic lymph node metastases (LNM), recurrences, and death due to the disease in early stage (FIGO I-II) cervical carcinomas. FIGO stage, type of histopathology, and tumor grade were also evaluated in this series of patients treated by radical hysterectomy (Wertheim-Meigs) between 1965 and 1990. A total of 172 patients were included. A tumor was regarded as positive when more than 30% of the neoplastic cells exhibited immunoreactivity. Positive immunostaining was found in 8.9% for p53, in 43.5% for bcl-2, and in 25.0% for p21WAF1/CIP1. None of them was able to predict LNM or clinical outcome. Presence of LNM, tumor recurrence, and death from disease were significantly associated with the FIGO stage (P = 0.014, P = 0.009, and P = 0.001, respectively). The 5-year cancer-specific survival rate was 91.6% and the overall survival rate was 90.5%. It was concluded that immunohistochemically detected p53, bcl-2, and p21WAF1/CIP1 appeared to be of no predictive value with regard to LNM, tumor recurrences, or long-term survival in early cervical carcinomas.

scholarly journals The survival rates and risk factors of implants in the early stage: a retrospective study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yong Yang ◽  
Huiting Hu ◽  
Mianyan Zeng ◽  
Hongxing Chu ◽  
Zekun Gan ◽  
...  
Keyword(s):  
Risk Factors ◽  
Survival Rate ◽  
Dental Implants ◽  
Bone Quality ◽  
Early Stage ◽  
Survival Rates ◽  
Bone Augmentation ◽  
Early Survival ◽  
Immediate Implantation ◽  
Implant Length

Abstract Background Few large-sample studies in China have focused on the early survival of dental implants. The present study aimed to report the early survival rates of implants and determine the related influencing factors. Methods All patients receiving dental implants at our institution between 2006 and 2017 were included. The endpoint of the study was early survival rates of implants, according to gender, age, maxilla/mandible, dental position, bone augmentation, bone augmentation category, immediate implant, submerged implant category, implant diameter, implant length, implant torque, and other related factors. Initially, SPSS22.0 was used for statistical analysis. The Chi-square test was used to screen all factors, and those with p < 0.05 were further introduced into a multiple logistic regression model to illustrate the risk factors for early survival rates of implants. Results In this study, we included 1078 cases (601 males and 477 females) with 2053 implants. After implantation, 1974 implants were retained, and the early survival rate was 96.15%. Patients aged 30–60 years (OR  2.392), with Class I bone quality (OR  3.689), bone augmentation (OR  1.742), immediate implantation (OR  3.509), and implant length < 10 mm (OR  2.972), were said to possess risk factors conducive to early survival rates. Conclusions The early survival rate of implants in our cohort exceeded 96%, with risk factors including age, tooth position, bone quality, implant length, bone augmentation surgery, and immediate implantation. When the above factors coexist, implant placement should be treated carefully.

scholarly journals Inhibition or Facilitation? Contrasted Inter-Specific Interactions in Sphagnum under Laboratory and Field Conditions

Plants ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1554
Author(s):  
Chao Liu ◽  
Zhao-Jun Bu ◽  
Azim Mallik ◽  
Yong-Da Chen ◽  
Xue-Feng Hu ◽  
...  
Keyword(s):  
Field Experiment ◽  
Species Interactions ◽  
Laboratory Experiments ◽  
Resource Competition ◽  
Specific Interactions ◽  
Interaction Type ◽  
Negative Effects ◽  
Experiment Data ◽  
The Stability ◽  
Positive Effect

In a natural environment, plants usually interact with their neighbors predominantly through resource competition, allelopathy, and facilitation. The occurrence of the positive effect of allelopathy between peat mosses (Sphagnum L.) is rare, but it has been observed in a field experiment. It is unclear whether the stability of the water table level in peat induces positive vs. negative effects of allelopathy and how that is related to phenolic allelochemical production in Sphagnum. Based on field experiment data, we established a laboratory experiment with three neighborhood treatments to measure inter-specific interactions between Sphagnum angustifolium (Russ.) C. Jens and Sphagnum magellanicum Brid. We found that the two species were strongly suppressed by the allelopathic effects of each other. S. magellanicum allelopathically facilitated S. angustifolium in the field but inhibited it in the laboratory, and relative allelopathy intensity appeared to be positively related to the content of released phenolics. We conclude that the interaction type and intensity between plants are dependent on environmental conditions. The concentration of phenolics alone may not explain the type and relative intensity of allelopathy. Carefully designed combined field and laboratory experiments are necessary to reveal the mechanism of species interactions in natural communities.

ROBUST ESTIMATION OF THE MEDIAN LETHAL DOSE

2002 ◽  
Vol 12 (2) ◽  
pp. 137-147 ◽  
Author(s):  
G. E. Kelly ◽  
J. K. Lindsey
Keyword(s):  
Robust Estimation ◽  
Lethal Dose ◽  
Median Lethal Dose

scholarly journals Sensitivity of The Stripe-Faced Dunnart, Sminthopsis Macroura (Gould 1845), To The Phenyl Pyrazole Insecticide, Fipronil, Toxicological Signs And Implications For Pesticide Risk Assessments In Australia

2021 ◽  
Author(s):  
Paul Story ◽  
Lyn A Hinds ◽  
Steve Henry ◽  
Andrew C. Warden ◽  
Greg Dojchinov
Keyword(s):  
Lethal Dose ◽  
Risk Assessments ◽  
Eutherian Mammal ◽  
Oral Toxicity ◽  
Median Lethal Dose ◽  
Agricultural Pesticides ◽  
Sminthopsis Macroura ◽  
The Difference ◽  
Ld50 Value ◽  
Female Responses

Abstract A lack of toxicity data quantifying responses of Australian native mammals to agricultural pesticides prompted an investigation into the sensitivity of the stripe-faced dunnart, Sminthopsis macroura (Gould 1845) to the insecticide, fipronil (5-amino-3-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-4-trifluoromethylsulfinyl pyrazole, CAS No. 120068-37-3). Using the Up-And-Down method for determining acute oral toxicity in mammals, derived by the Organisation for Economic Cooperation and Development (OECD), median lethal dose estimates of 990 mg kg− 1 (95% confidence interval (CI) = 580.7–4770.0 mg kg− 1) and 270.4 mg kg− 1 (95% CI = 0.0 - >20000.0 mg kg− 1) were resolved for male and female S. macroura respectively. The difference between median lethal dose estimates for males and females may have been influenced by the increased age of two female dunnarts. Further modelling of female responses to fipronil doses used the following assumptions: (a) death at 2000 mg kg− 1, (b) survival at 500 mg kg− 1 and (c) a differential response (both survival and death) at 990 mg kg− 1. This modelling revealed median lethal dose estimates for female S. macroura of 669.1 mg kg− 1 (95% CI = 550–990 mg kg− 1; assuming death at 990 mg kg− 1) and 990 mg kg− 1 (95% CI = 544.7–1470 mg kg− 1; assuming survival at 990 mg kg− 1). These median lethal dose estimates are 3–10-fold higher than the only available LD50 value for a similarly sized eutherian mammal, Mus musculus (L. 1758; 94 mg kg− 1) and that available for Rattus norvegicus (Birkenhout 1769; 97 mg kg− 1). Implications for pesticide risk assessments in Australia are discussed.

scholarly journals Effect of a dragonfly (<i>Bradinopyga strachani</i> Kirby, 1900) on the density of mosquito larvae in a field experiment using mesocosms

Web Ecology ◽  
2018 ◽  
Vol 18 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Daniel Acquah-Lamptey ◽  
Roland Brandl
Keyword(s):  
Field Experiment ◽  
Laboratory Experiments ◽  
Water Bodies ◽  
Mosquito Population ◽  
Mosquito Larvae ◽  
Promising Strategy

Abstract. Laboratory experiments with food-deprived larvae of odonates suggested that these predators may have the potential to control mosquito populations. However, it remains unclear whether larvae of odonates co-occur with mosquito larvae in the field and whether larvae of odonates reduce the density of mosquito larvae in the field. We exposed 35 water-filled concrete containers in the field in shady and sunny conditions. Some of these containers were partially covered (for simplicity called closed containers, allowing only mosquitoes to lay eggs), whereas others remained open. The density of mosquito larvae was higher in shaded containers and in closed containers. The multivoltine odonate Bradinopyga strachani colonized open containers and the occurrence of these predators resulted in a clear reduction of the mosquito population. Our results indicate that increasing the colonization of water bodies by Bradinopyga strachani is a promising strategy for controlling populations of mosquitoes.

scholarly journals Antimicrobial Peptides Epinecidin-1 and Beta-Defesin-3 Are Effective against a Broad Spectrum of Antibiotic-Resistant Bacterial Isolates and Increase Survival Rate in Experimental Sepsis

Antibiotics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 76
Author(s):  
Albert Bolatchiev
Keyword(s):  
Antibacterial Activity ◽  
Survival Rate ◽  
Antimicrobial Peptides ◽  
Lethal Dose ◽  
Experimental Models ◽  
Experimental Sepsis ◽  
Epinephelus Coioides ◽  
Sterile Saline

The antimicrobial peptides human Beta-defensin-3 (hBD-3) and Epinecidin-1 (Epi-1; by Epinephelus coioides) could be a promising tool to develop novel antibacterials to combat antibiotic resistance. The antibacterial activity of Epi-1 + vancomycin against methicillin-resistant Staphylococcus aureus (22 isolates) and Epi-1 + hBD-3 against carbapenem-resistant isolates of Klebsiella pneumoniae (n = 23), Klebsiella aerogenes (n = 17), Acinetobacter baumannii (n = 9), and Pseudomonas aeruginosa (n = 13) was studied in vitro. To evaluate the in vivo efficacy of hBD-3 and Epi-1, ICR (CD-1) mice were injected intraperitoneally with a lethal dose of K. pneumoniae or P. aeruginosa. The animals received a single injection of either sterile saline, hBD-3 monotherapy, meropenem monotherapy, hBD-3 + meropenem, or hBD-3 + Epi-1. Studied peptides showed antibacterial activity in vitro against all studied clinical isolates in a concentration of 2 to 32 mg/L. In both experimental models of murine sepsis, an increase in survival rate was seen with hBD-3 monotherapy, hBD-3 + meropenem, and hBD-3 + Epi-1. For K. pneumoniae-sepsis, hBD-3 was shown to be a promising option in overcoming the resistance of Klebsiella spp. to carbapenems, though more research is needed. In the P. aeruginosa-sepsis model, the addition of Epi-1 to hBD-3 was found to have a slightly reduced mortality rate compared to hBD-3 monotherapy.

scholarly journals Case Report: Carcinoma of Colon

2018 ◽  
Vol 4 (1) ◽  
pp. 1-3
Author(s):  
sushila ladumor ◽  
Adham Darweesh
Keyword(s):  
Colorectal Cancer ◽  
Case Report ◽  
Survival Rate ◽  
Gastrointestinal Tract ◽  
Colorectal Carcinoma ◽  
Surgical Resection ◽  
Early Stage ◽  
Occult Lesion ◽  
Carcinoma Of Colon ◽  
Ct And Mri

Colorectal cancer is a disease that is curable if diagnosed at early stage and also it is preventable if predisposing adenomas are detected and removed. Colorectal Carcinoma (CRC) is commonest malignancy of the gastrointestinal tract and is the second most usually diagnosed cancer in adults, mainly at 6th to 7th decades of life[2]. CT and MRI are the modalities of choice used for staging. Colonoscopy for better evaluation and tissue diagnosis as well as to see other occult lesion. Surgical resection may be curative although five-year survival rate is 40 - 50 %.

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