An indirect method for determining the order of expected thinning response among overstocked lodgepole pine stands

1986 ◽  
Vol 16 (5) ◽  
pp. 875-879
Author(s):  
Dennis M. Cole
Keyword(s):  
Linear Regression ◽  
Indirect Method ◽  
Lodgepole Pine ◽  
Site Index ◽  
Tree Stand ◽  
Cross Sectional ◽  
Quadratic Mean ◽  
Response Variable ◽  
The Common ◽  
Pine Stands

Relationships for representing relative thinning response potential among overstocked lodgepole pine stands were investigated with data from 31 stands in four National Forests of Idaho. The common logarithm of mean 10-year cross-sectional increment of dominant and codominant trees on stand edges created by clearing was the dependent variable selected for examining relationships with a large number of tree, stand, and site variables. A linear regression model explained nearly 60% of the variance in the response variable. The model included variables representing mean 10-year periodic cross-sectional increment prior to clearing, site index, and quadratic mean stand diameter. As a predictor of edge-tree response to clearing, the model represents relative thinning response differences to be expected among overstocked lodgepole pine stands and thus reflects relative stand vigor.

Comparing site productivity of mature fire-origin and post-harvest juvenile lodgepole pine stands in Alberta

2004 ◽  
Vol 34 (6) ◽  
pp. 1181-1191 ◽  
Author(s):  
Shongming Huang ◽  
Robert A Monserud ◽  
Thomas Braun ◽  
Hugh Lougheed ◽  
Olenka Bakowsky
Keyword(s):  
Lodgepole Pine ◽  
Total Yield ◽  
Site Index ◽  
Rate Of Change ◽  
Growth And Yield ◽  
Annual Increment ◽  
Projection System ◽  
Post Harvest ◽  
Pine Stands ◽  
Fire Origin

Twenty-two paired-plot sample locations were revisited to re-examine the site indices of mature fire-origin and adjacent post-harvest juvenile lodgepole pine (Pinus contorta var. latifolia Engelm.) stands occurring on the same physiographic sites. The post-harvest juvenile stands followed harvesting and drag scarification, whereas the mature fire-origin stands received no stand treatment. Results showed that the site index of post-harvest juvenile stands was 27% to 35% higher than that of the mature fire-origin stands. Calculation of the rate of change in site index indicated that the site index estimates of post-harvest stands were stable after 5 years breast height age was reached. This suggests that the increase in site index in post-harvest stands is not a short-term artifact, but a sustained gain that will be maintained over time. Simulations of post-harvest yield based on the Alberta growth and yield projection system (GYPSY) for lodgepole pine suggested that the increase in post-harvest site index will likely result in substantial gains in the mean annual increment and total yield of post-harvest lodgepole pine stands in the study area. The results of this study indicate that post-harvest lodgepole pine stands are growing significantly faster than their fire-origin counterparts on equivalent sites.

Modeling percent stocking changes for lodgepole pine stands in Alberta

2008 ◽  
Vol 38 (5) ◽  
pp. 1042-1052 ◽  
Author(s):  
Yuqing Yang ◽  
Shongming Huang
Keyword(s):  
Pinus Contorta ◽  
Sustainable Forest Management ◽  
Lodgepole Pine ◽  
Model Fitting ◽  
Covariance Structure ◽  
Site Index ◽  
Logistic Function ◽  
Correlated Errors ◽  
Validation Data ◽  
Pine Stands

A percent stocking change model was developed for lodgepole pine ( Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) in Alberta based on spatially mapped permanent sample plot data. Percent stocking was defined as the percentage of 10 m2 subplots occupied by at least one tree with a minimum height of 1.3 m. The difference equation technique was employed to fit the model. Three model forms were examined and the logistic function was chosen as the final model. Site index was found to be a significant predictor and incorporated into the model. Analyses revealed that the model had correlated, but homoskedastic errors and the correlated errors were modeled by spherical covariance structure using NLINMIX macro in SAS. A percent stocking index, defined as the percent stocking at 50 years total age, was introduced and derived from the developed model. The percent stocking model had both forward and backward projection capabilities. It was demonstrated, both on model fitting and validation data, that the model adequately portrayed the percent stocking dynamics of lodgepole pine stands in Alberta. The model also provided an important basis for creating linkages between reforestation survey results and future yield, which is crucial for sustainable forest management.

Leaf area - sapwood area relations of lodgepole pine as influenced by stand density and site index

1988 ◽  
Vol 18 (2) ◽  
pp. 247-250 ◽  
Author(s):  
James N. Long ◽  
Frederick W. Smith
Keyword(s):  
Leaf Area ◽  
Forest Ecology ◽  
Lodgepole Pine ◽  
Stand Density ◽  
Site Index ◽  
Site Quality ◽  
Cross Sectional ◽  
Sapwood Area ◽  
Pine Trees ◽  
Stand Conditions

Leaf area to sapwood area ratios for a given species are believed to vary with factors such as site quality, stand density, early stand growth rates, and crown class. Based on data from 55 mature lodgepole pine trees (Pinuscontorta var. latifolia Dougl.) from 10 plots in southeastern Wyoming, we conclude that putative density and site effects on leaf area - sapwood area relations are actually a consequence of the increase in the leaf area to sapwood area ratio with increasing sapwood area. When leaf area is estimated with a nonlinear model that includes tree size and distance to the live crown, the apparent effects of stand density and site index disappear. We consider a constant ratio of leaf area and sapwood cross-sectional area to be inappropriate for the estimation of leaf area aross the range of stand conditions included in most studies of forest ecology.

Side Effects of Chemotherapy and Cancer Treatment in Tertiary Care Teaching Hospital

2016 ◽  
Vol 2 (1) ◽  
pp. 62-78
Author(s):  
. Hemraj ◽  
Raj Kumar ◽  
Sourabh Kosey ◽  
Amit Sharma ◽  
Nalini Negi
Keyword(s):  
Side Effects ◽  
Tertiary Care ◽  
Cross Sectional Study ◽  
Informational Needs ◽  
Cross Sectional ◽  
Clinical Pharmacists ◽  
Medical College ◽  
Related Information ◽  
The Common ◽  
Chemotherapy Patients

To determine the most common physical side effects experienced by local chemotherapy patients. Their perceptions of these side effects and informational needs from clinical pharmacists were also evaluated. This was a single center, observational cross-sectional study conducted at department of General Surgery, Guru Gobind Singh Medical College and Hospital, Faridkot, Punjab. A face to face interview was conducted. Information collected included chemotherapy related side effects after last chemotherapy experience, the most worrisome side effects, overlooked by healthcare professionals and the preferred method, amount and source of receiving related information. In this study, hundred patients were enrolled out of them 48 were male and 52 were female. When differential calculations was done, common side effects or adverse effects of chemotherapy in the patients of breast, lung cancer, Ovarian Cancer, Colon cancer, Prostate cancer, Lymphoma Cancer, Cervix cancer where there is much irregular medicine intake 57.4% may be due to common problem of joint pain reported by all the patients under study, with the consecutive problem of nausea and vomiting. The high prevalence of chemotherapy related side effects among local patients is a major concern and findings of their perceptions and informational needs may serve as a valuable guide for clinical pharmacists and physicians to help in side effect management. This study shows the common problems reported by the patients when they are suffering from cancer condition, according to their incidence perceptions as experienced by the patient, this will allow the physician and clinical pharmacist to effectively counsel and manage the common symptoms as reported prior to its occurrence in the patient, so that withdrawal can be checked.

STUDY OF PEDIATRIC INJURIES: PATTERNS AND OUTCOME

2019 ◽  
Vol 3 (8) ◽  
Author(s):  
Yasir. B. Elshambaty
Keyword(s):  
School Level ◽  
Common Mechanism ◽  
Injury Patterns ◽  
Severe Injuries ◽  
Injured Child ◽  
Cross Sectional ◽  
Pediatric Injuries ◽  
Pediatric Injury ◽  
The Common ◽  
Structured Questionnaire

Purpose this study aims to show the patterns and outcome of pediatric injury among those living in Albaha region in Saudi Arabia Methods this is a cross-sectional descriptive household-based study, included children between 0-17 years old both male and female. The data were collected with structured questionnaire between 20 Nov – 20 Dec 2018 and  analyzed with SPSS version 25 Results the total of participants was 257 injured child. 199(77.4%) are male and 58(22.6%) are female. About 44%of them were injured at pre-school level and 56% were traumatized at school age. The least incidence of injury occurred in those less than 2 yrs and higher incidence in those between 3-10 yrs old. The most common mechanism of injury was falling from height. The most affected group age by RTA accidents was 11-17 yrs old. Approximately 83% of the injured children required hospital management. Only one third of the injuries were  associated complications. The most common injured anatomic part was the upper limb and the least affected part was the spine. Only 5% of the injuries were associated with a disability and the common was loss of organ or part of it. Paralysis occurred in less than 1% and head injury resulted in disabilities more than 1%. Conclusion the vast majority of the injuries in our participants are not serious. The severe injuries were associated with RTA-related trauma. Most of injuries due to falling from height are not serious. We recommend not to allow the children to drive cars. Keywords: pediatric injuries; injury patterns; household.

Comparison of Heffner Criteria and Light Criteria in Differentiating Exudative and Transudative Pleural Effusion

2020 ◽  
Vol 22 (3) ◽  
pp. 141-145
Author(s):  
Krishna Chandra Devkota ◽  
S Hamal ◽  
PP Panta
Keyword(s):  
Pleural Effusion ◽  
Cross Sectional Study ◽  
Pleural Space ◽  
Sectional Study ◽  
Inclusion Criteria ◽  
Cross Sectional ◽  
Medical College ◽  
The Common ◽  
The Mean ◽  
Exudative Pleural Effusion

Pleural effusion is present when there is >15ml of fluid is accumulated in the pleural space. It can be divided into two types; exudative and transudative pleural effusion. Tuberculosis and parapneumonic effusion are the common cause of exudative pleural effusion whereas heart failure accounts for most of the cases of transudative pleural effusion. This study was a hospital based cross sectional study performed at Nepal Medical College during the period of January 2016-December 2016. A total of 50 patients who fulfilled the inclusion criteria were enrolled. Pleural effusion was confirmed by clinical examination and radiology. After confirmation of pleural effusion, pleural fluid was aspirated and was analysed for protein, LDH, cholesterol. The Heffner criteria was compared with Light criteria to classify exudative or transudative pleural effusion. Among 50 patients, 30 were male and 20 were female. The mean age of patient was 45.4±21.85 years. The sensitivity and specificity of using Light criteria to detect the two type of pleural effusion was 100% and 90.9%, whereas using Heffner criteria was 94.87%, 100% respectively(P<0.01). There are variety of causes for development of pleural effusion and no one criteria is definite to differentiate between exudative or transudative effusion. In this study Light criteria was more sensitive whereas Heffner criteria was more specific to classify exudative pleural effusion. Hence a combination of criteria might be useful in case where there is difficulty to identify the cause of pleural effusion.

HISTOPATHOLOGY OF THE PIGMENTED TUMORAL-LIKE LESIONS OF THE SKIN AT HUE HOSPITAL OF MEDICINE AND PHARMACY UNIVERSITY

2018 ◽  
Vol 8 (4) ◽  
pp. 65-69
Author(s):  
Mao Nguyen Van ◽  
Dong Tran Nam
Keyword(s):  
Key Words ◽  
Definitive Diagnosis ◽  
The Other ◽  
Cell Tumour ◽  
Cross Sectional ◽  
Skin Tumour ◽  
Clinical Appearance ◽  
The Face ◽  
The Common ◽  
Difficult Cases

Background: Pigmented tumour of the skin is one of the common tumour in human including the benign pigmented tumours (more common) called Nevi tumours and the malignant one called melanoma which was less frequent but the most poor in prognosis. In addition, the others not belonging to these group had the same clinical appearance, so the application of histopathology and immunohistochemistry for the definitive diagnosis was indespensible. Objectives: 1. To describe the macroscopic features of the pigmented tumoral-like lesions; 2. To classify the histopathologic types of the pigmented cell tumours and the other pigmented tumours of the skin. Materials and Method: Cross-sectional research on 55 patients diagnosed as pigmented tumoral lesions by clinician, then all definitively diagnosed by histopathology combining the immunohistochemistry in difficult cases. Results: There was no difference in gender, the disease was discovered most common in adult, especially with the age over 51 years old (58.1%). the most region located was in the face accounting for 60%, following the trunk and limbs (14.6%, 12.8% respectively). All 3 malignant melanomas happened in foot. The most common color of the lesions was black (65.4%), the other ones were rose, grey and blue. Histopathology and immunohisthochemistry showed that the true pigmented cell tumours were 52.6% encompassing benign ones (Nevi tumour) (41.8%), melanoma (5.4%) and lentigo (5.4%). 47.4% was not the true pigmented cell tumour including pigmented basocellular carcinoma (36.4%) and the others less common as histiofibromas, acanthoma and papilloma. Conclusion: the pigmented tumoral-like lesions of the skin could be the true pigmented cell tumours and the others, so the application of the histopathology and the immunohistochemistry after the clinical discovery helps to determine and classify the disease definitely and for the best orientation of treatment as well. Key words: skin tumour, benign pigmented tumour (Nevi), malignant pigmented tumour (melanoma), pigmented basocellular carcinoma

EVALUATING THE RESULTS OF SEPTOPLASTY AND PARTIAL INFERIOR TURBINOPLASTY

2017 ◽  
pp. 46-52
Author(s):  
Thanh Thai Le ◽  
Phuong Nam Tran ◽  
Thi Ngan An Nguyen
Keyword(s):  
Key Words ◽  
Nasal Obstruction ◽  
Inferior Turbinate ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Grade Ii ◽  
The Common

Aims: To study outcomes of septoplasty and partial inferior turbinectomy (PIT) method, expecting leastsurgical equipment, good result, price rationalization. Methods: Prospective, cross-sectional study. Including 40 patients treated by septoplasty and PIT method. Assessment had been made after 3 months post-op. Results: The common symptoms were nasal obstruction (100%), headache (40%). The deformities of nasal septalwere deviation (42.5%), crest (30%). There were 67.5% of patients with severe bilateral hypertrophic inferior turbinate, mostly over grade II, enlargement both soft and bone parts (60%). After 3 months, the nasal obstruction and headache presented good or great results in 90% of patients, 93.7% of patients had straight nasal septaland 90% hadsmall inferior turbinate.VAS: patients’s contentment was 100%. Conclusions: The study showed that septoplasty and partial inferior turbinectomy presented good results with 87.5% after surgery and 90% after 3 months. Key words: septal deformity, hypertrophy inferior turbinate, septoplasty, partial inferior turbinectomy

Decrease in Secondary Neck Vessels in Multiple Sclerosis: A 5-year Longitudinal Magnetic Resonance Angiography Study

2019 ◽  
Vol 16 (3) ◽  
pp. 215-223 ◽  
Author(s):  
Dejan Jakimovski ◽  
Matthew Topolski ◽  
Kana Kimura ◽  
Virja Pandya ◽  
Bianca Weinstock-Guttman ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Magnetic Resonance ◽  
Magnetic Resonance Angiography ◽  
Longitudinal Change ◽  
Repeated Measure ◽  
Cross Sectional ◽  
False Discovery ◽  
The Common ◽  
Neck Vessels

Background: Studies have previously shown greater arterial and venous extracranial vascular changes in persons with multiple sclerosis (PwMS) when compared to healthy controls (HCs). Objectives: To determine the change in the number and size of secondary neck vessels in PwMS and HCs over a 5-year follow-up period. Methods: Both at baseline and follow-up, 83 PwMS and 25 HCs underwent magnetic resonance angiography (MRA) imaging and analysis. The number and cross-sectional area (CSA) of all secondary neck vessels (excluding the common/internal carotid, vertebral artery, and internal jugular vein) measured at levels from C2-T1 were determined by semi-automated edge detection/ contouring software. The longitudinal change in the number and CSA of the secondary neck vessels from the PwMS and HCs were analyzed by non-parametric Wilcoxon repeated measure. Benjamini-Hochberg procedure adjusted for false discovery rate (FDR). Results: For over 5 years, PwMS demonstrated a consistent longitudinal decrease in both the number of secondary neck vessels (Z-change between -3.3 and -5.4, q=0.001) and their CSA (Zchange between -2.9 and -5.2, q=0.004). On the contrary, the HCs did not demonstrate a significant longitudinal change in secondary neck vessels over the follow-up period. Due to the longitudinal decrease, the PwMS showed a lower number of secondary neck vessels when compared to HCs measured at follow-up (p<0.029, except for C4 with trending p=0.071). The PwMS changes were also corroborated within each MS phenotype. Conclusion: PwMS demonstrate a significant mid-term decrease in the number and the size of the secondary neck vessels. The clinical relevance of these findings and the effect on intracranial blood flow are currently unknown.

Folate Nutritional Status among Psoriasis Patients not Exposed to Antifolate Drug

2020 ◽  
Vol 16 (4) ◽  
pp. 543-553
Author(s):  
Luciana Y. Tomita ◽  
Andréia C. da Costa ◽  
Solange Andreoni ◽  
Luiza K.M. Oyafuso ◽  
Vânia D’Almeida ◽  
...  
Keyword(s):  
Folic Acid ◽  
Linear Regression ◽  
Multiple Linear Regression Model ◽  
Folate Intake ◽  
Serum Folate ◽  
Linear Regression Models ◽  
Cross Sectional ◽  
Folic Acid Fortification ◽  
Plasma Folate ◽  
Psoriasis Severity

Background: Folic acid fortification program has been established to prevent tube defects. However, concern has been raised among patients using anti-folate drug, i.e. psoriatic patients, a common, chronic, autoimmune inflammatory skin disease associated with obesity and smoking. Objective: To investigate dietary and circulating folate, vitamin B12 (B12) and homocysteine (hcy) in psoriatic subjects exposed to the national mandatory folic acid fortification program. Methods: Cross-sectional study using the Food Frequency Questionnaire, plasma folate, B12, hcy and psoriasis severity using the Psoriasis Area and Severity Index score. Median, interquartile ranges (IQRs) and linear regression models were conducted to investigate factors associated with plasma folate, B12 and hcy. Results: 82 (73%) mild psoriasis, 18 (16%) moderate and 12 (11%) severe psoriasis. 58% female, 61% non-white, 31% former smokers, and 20% current smokers. Median (IQRs) were 51 (40, 60) years. Only 32% reached the Estimated Average Requirement of folate intake. Folate and B12 deficiencies were observed in 9% and 6% of the blood sample respectively, but hyperhomocysteinaemia in 21%. Severity of psoriasis was negatively correlated with folate and B12 concentrations. In a multiple linear regression model, folate intake contributed positively to 14% of serum folate, and negative predictors were psoriasis severity, smoking habits and saturated fatty acid explaining 29% of circulating folate. Conclusion: Only one third reached dietary intake of folate, but deficiencies of folate and B12 were low. Psoriasis severity was negatively correlated with circulating folate and B12. Stopping smoking and a folate rich diet may be important targets for managing psoriasis.

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