Rusli
OFFICIAL BLOG For Biophysics Laboratory dedicated for my Great Lecture (Mr.Y.C. Hariadi and Mrs.A.Y. Nurhayati) Bloggers Team (Rusli, Umil, Arum)
Senin, 13 Juni 2011
Tugas Teknologi Informasi
Sekarang adalah masa-masa Ujian Akhir Semester (UAS) dimana seluruh kegiatan perkuliahan telah menempuh batas akhir dan sekarang mencapai Pengujian bagi seluruh mahasiswa. Baik Mahasiswa baru ( angkatan 2010) maupun yang lama. Untuk Tugas Teknologi Informasi (TI) bagi mahasiswa baik lama maupun baru tetap harus mengumpulkan tugas Blog ke website fakultas MIPA dan setelah itu akan mendapatkan proses atau hasil penilaian dari Bapak Dosen. Drs. Yudha C.H. M.Sc. Ph.D. maka Baru tugas tersebut dan nilai dari mata kuliah tersebut keluar. Sekian Terimakasih
Rusli
Rusli
Sabtu, 26 Februari 2011
5 Cara Unik Kuliah
Ada sebuah pertanyaan yang pernah melayang ke Saya (rusli) "mas gimana sih cara bertahan di Jurusan Fisika Fakultas MIPA Unej?" Pertanyaan tersebut Megelitik Juga menjadi menantang Buat ku jawab. Pertama, kenapa pertanyaan ini datang dari mahasiswa semester 2, dan selanjutnya kenapa harus saya yang menjawab. Padahal ada beberapa mahasiswa di tingkat atasnya yang memiliki predikat Cumlaude yang mungkin berpotensi menjawab pertanyaan tersebut (tapi mungkin secara teoritis bukan secara Rusliisme),
Oke Back To topic..
"mas gimana sih cara bertahan di Jurusan Fisika Fakultas MIPA Unej?"
Cara Bertahan Yang saya lakukan agar bertahan ada cara teoritis dan cara praktiknya
Namun Saran praktikum kehidupan kampus saya adalah, berjuanglah karena menurut EINSTEIN 1% bakat dan 99% adalah kerja Keras. Dan BALASLAH semua kebaikan dan keburukan setiap orang yang bersikap kepada anda.
Oke Back To topic..
"mas gimana sih cara bertahan di Jurusan Fisika Fakultas MIPA Unej?"
Cara Bertahan Yang saya lakukan agar bertahan ada cara teoritis dan cara praktiknya
- Ketahui status, artinya setiap mahasiswa harus mengerti siapakah dirinya dan apakah statusnya. Karena hal inilah yang membedakan antara pendidikan Sekolah dengan Pengajaran Perguruan Tinggi.
- Cintai Kampus,
Jangan Cintai Orangnyamaksudnya adalah dengan mencintai lingkungan kampus, seberapun jahat dan ketatnya persaingan tidak akan menjadi beban dalam dunia perkuliahan. - Bertanggung Jawab, Kaidah ini sebenarnya teori umum dalam kehidupan dimana Semua orang pasti tahu dan mengerti beberapa pribahasa, kucing dipegang ekor, manusia dipegang kata-katanya (maksudnya Tanggung JAWAB).
- Jujur, aspek mencintai kampus akan membuat orang menjadi survive/ bertahan namun yang paling penting dalam benteng Bertahan adalah Jujur, setidaknya Jujur terhadap Diri sendiri.
- Berkarya, INILAH teori yang mendasari bahwa saya sangat senang di dunia perkuliahan dan Kampus karena tidak ada batasan kreasi serta karya yang menjadikan tolak ukur seorang mahasiswa, berdemo adalah karya dan kreasi jiwa dalam menyuarakan pendapat, namun tidak berdemo dan membuat karya jika expresi jiwa bahwa karya bisa di demonstrasi.
Namun Saran praktikum kehidupan kampus saya adalah, berjuanglah karena menurut EINSTEIN 1% bakat dan 99% adalah kerja Keras. Dan BALASLAH semua kebaikan dan keburukan setiap orang yang bersikap kepada anda.
Sabtu, 12 Februari 2011
9 buku Hacking
Okelah para pembaca yang budiman,
kali ini saya akan membagikan sedikit buku (sebenarnya ada 9 ebook) tapi sudah saya compile jadi satu zip. pada nih buku ada beberapa macam cara mengatasi dan mengakali/ nge-Hack bagaimana sistem jaringan berjalan. Dan buku ini saya bagikan gratis, karena prosesi downloadnya yang hanya menggunakan internet akses dirumah (BONYOK yang bayar,, heheheheh ☻) oleh karena itu demi kepentingan belajar bersama cek ini.
semua ini demi kepentingan belajar. Jika nantinya buku ini digunakan dalam kepentingan Jahat ataupun kriminal Mohon maaf sebelumnya, kami tidak akan bertanggung jawab atas kerusakan apapun yang disebabkan dalam praktek dari buku ini. sekian terimakasih
kali ini saya akan membagikan sedikit buku (sebenarnya ada 9 ebook) tapi sudah saya compile jadi satu zip. pada nih buku ada beberapa macam cara mengatasi dan mengakali/ nge-Hack bagaimana sistem jaringan berjalan. Dan buku ini saya bagikan gratis, karena prosesi downloadnya yang hanya menggunakan internet akses dirumah (BONYOK yang bayar,, heheheheh ☻) oleh karena itu demi kepentingan belajar bersama cek ini.
semua ini demi kepentingan belajar. Jika nantinya buku ini digunakan dalam kepentingan Jahat ataupun kriminal Mohon maaf sebelumnya, kami tidak akan bertanggung jawab atas kerusakan apapun yang disebabkan dalam praktek dari buku ini. sekian terimakasih
Rabu, 09 Februari 2011
New Members
The newest member from BIOPYSICS laboratory, had 5 people. Some of them will be manage this Blogs with new design, new topics of some post or link. However me(rusli) will directed by, some order job desk from mr. Yudha and Mrs. Arry.
Minggu, 30 Januari 2011
Lama gak Nongol
Hola (moderator: rusli)
ada yang lucu dari Blog ini. walaupun bisa di posting setiap hari namun blog ini merepresentasikan keadaan Laboratorium biofisika fmipa unej. bisa dibayangin. hampir setiap hari aku bisa online, tapi buat postingan aja.. ampe nunggu selama 5 bulanan!! gila gak tuh?? lah sekarang akan diperbanyak lagi postingannya. cos. pembina nih Blog (Mr.Yuda n Mrs. Arry) dah datang.. di tambah semangat bekerja dari 2 pengangguran kita,, yang sering aja kerjain proyek gak jelas.. huft.. semoga postingan kali ini merepresentasikan postingan dan keadaan Laborat yang kita cintai.. oke Matur nuwun
Bye
ada yang lucu dari Blog ini. walaupun bisa di posting setiap hari namun blog ini merepresentasikan keadaan Laboratorium biofisika fmipa unej. bisa dibayangin. hampir setiap hari aku bisa online, tapi buat postingan aja.. ampe nunggu selama 5 bulanan!! gila gak tuh?? lah sekarang akan diperbanyak lagi postingannya. cos. pembina nih Blog (Mr.Yuda n Mrs. Arry) dah datang.. di tambah semangat bekerja dari 2 pengangguran kita,, yang sering aja kerjain proyek gak jelas.. huft.. semoga postingan kali ini merepresentasikan postingan dan keadaan Laborat yang kita cintai.. oke Matur nuwun
Bye
Selasa, 14 September 2010
Minggu, 05 September 2010
NMR Spectroscopy
Nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) can be used to observe signals from various nuclei, but this book focuses only on the proton (1H) of water molecules (H2O) as the nucleus of interest. This is because more than 90% of protons in the body are located in water molecules, and theMRI signal is therefore dominated by water. When we perform NMR spectroscopy, we put our sample (in this case, water) in a tube and place it inside a magnet.
We then input energy into the sample (a process called excitation) and observe the signal emitting from the sample. This is similar to ringing a bell and listening to the sound. There are only three types of information in the signal: frequency (i.e., high or low pitch), intensity (i.e., loudness), and phase. To visualize this information, we use a waveform diagram
These waves are often called time-domain data because the horizontal axis is the time elapsed while we are listening to the signal. After Fourier transform, the time axis transforms to the so-called frequency domain, in which the horizontal axis is frequency
Selasa, 27 Juli 2010
Energy Transfer
The stochastic quality of the electron track as it deposits energy is not adequately described by the usual mathematical formulations. The Bethe-Bloch stopping power equation (which will be discussed in detail in Chapter 14) describes the process of energy transfer from a slowing down electron as a continuous process. That is to say, the energy is assumed to be deposited in a continuous stream rather than in the discrete and punctate fashion that occurs in the real case. This has come to be known as the continuous slowing down approximation. The Bethe-Bloch approximation, which is suitable for general physics questions, proves to be inadequate to describe the events that ultimately lead to molecular alterations in the medium. For example, if we examine the tracks of two electrons of equal starting kinetic energy and identical starting location, the distribution of events along the track will be different and so will be the physical locations of the tracks. Only for very high linear energy transfer (LET) radiations does the continuous slowing down approximation approach reality.
Minggu, 25 Juli 2010
An Internalization Wave of Caveolae can be Stimulated by Virus
Studies on the entry of simian 40 (SV40) virus by Pelkmans and coworkers [52–54] have documented that caveolae can actually play a role in nonconstitutive endocytosis. Thus, after binding of SV40 virus to the cell surface via the MHC class I molecule, the virus particles move laterally in the plasma membrane to end up in caveolae. Although these caveolae are initially immobile, the virus initiates a complex signaling cascade leading to a profound disorganization of the cortical actin cytoskeleton and a transient recruitment of the GTP-binding protein dynamin known to be involved in membrane fission (see Section 4.8). Importantly, without SV40-stimulation, less than 10% of the caveolae were associated with dynamin.
These changes, in turn, resulted in a wave of incoming caveolar vesicles containing virus where reorganized actin filaments formed “tails” necessary for internalization of the SV40-containing caveolae [53]. Subsequently, the virus was delivered
to caveosomes (see Section 4.7) and transported further downstream to the endoplasmic reticulum (ER). However, a delay of several hours then occurs before caveolin returns from the caveosomes to the plasma membrane in vesicles now devoid of virus particles [52].
It is interesting to note that antibody-induced crosslinking of MHC class I moleules (the SV40 receptor) results in an accumulation of MHC class I clusters in small uncoated surface invaginations” identical to caveolae, as reported 25 years go by Huet and coworkers. No clusters were found in clathrincoated pits. From he caveolae-like invaginations the clusters were apparently internalized and delivred to lysosomes [55]. It is therefore tempting to speculate that it is the samen derlying mechanism that is responsible for caveolae-mediated uptake of SV40 virus particles after their binding to MHC class I and of MHC class I clusters
enerated by antibody crosslinking.
Source:: lipid raft and C. Fielding, J.C. Jhonwilley and Son
Evidence for Phase Separation in Model Membrane Systems
Liquid-Ordered and Liquid-Disordered Phases
Various model membrane systems have been used by physicists and chemists to study phase separation in lipid mixtures. They are either monolayers or bilayers. Monolayers are either assembled at an air-water interface with the packing density of the lipids being adjusted by applying lateral pressure, or on a supporting lipid monolayer that is fixed to a solid support. Bilayers are used in the supported version as described above, or in the form of vesicles. The most commonly used vesicles are large or giant unilamellar vesicles (LUV or GUV, respectively) composed of only a single bilayer, but also multilamellar vesicles (MLV) are used. The basic principles were first established in simple binary lipid mixtures, but recently
ternary mixtures which more closely mimic the composition of the cell plasma membrane have been used. The mixtures usually contain one lipid with a high melting temperature (Tm), one with a low Tm, and cholesterol. GUVs are probably the system closest to a cell membrane, because artifacts from a support are excluded. Still, cell membranes are asymmetric with different lipid compositions of the outer versus the inner leaflet, while the GUVs used so far were all symmetric.
Since maintaining an asymmetric lipid distribution is energy-consuming, perhaps by reconstituting lipid translocators into liposomes this drawback can be overcome in the future. Although model membrane systems produce very simplified pictures of cell membranes, there are many examples of a close correlation with experimental data obtained in living cells [14]. Ipsen et al. were the first to describe the formation of a liquid-ordered phase by cholesterol and saturated phospholipids [15,16]. This phase can coexist with other lipid phases, and its characteristics are described as follows: the translational order of lipid molecules within the liquid-ordered phase is similar to that in a fluid bilayer state, whereas the configurational order of the hydrocarbon chains compares more to that in a gel state. The formation of the liquid-ordered phase was attributed to the unique chemical nature of cholesterol (for a review, see [17]), but later it was shown that all natural sterols promote domain formation and that also
small amounts of ceramide (3%) can stabilize domains formed in vesicles [18]. Leventis and Silvius showed that the interaction of cholesterol with different lipid species is dependent on the nature of their hydrocarbon chains and, to a lesser extent, also on their headgroup. The interaction preference decreases with SM > PS > PC > PE and with increasing unsaturation of the acyl chains [19]. Whereas the kink in unsaturated hydrocarbon chains is likely to hinder tight packing with the flat sterol ring of cholesterol, the reason for the preferential interaction of cholesterol with SM is still a debated issue.
Source::
Fielding, J.Christtoper, lipid raft and caveolae . Jhown willey and Son Publishe
Kamis, 08 April 2010
Rabu, 07 April 2010
BLOGGING lagi
baru Juga Beberapa Hari.. (sebenarnya udah Berbulan-bulan) Blog ini gak Di Kunjungi ma Yang Bikin,, Yang Ngelola.. Pada Sibuk Skripsi.. Eh Browsing Buat cari Resensi dari Kang Google eh malah Nyasar Ke Blog Pemerintah Bisa Dibayangin,, Biasanya Cuman Lewat,, N Coment Gak Penting Sekarang Beda,, Malah Bikin Link Ma LIPI... Semoga Bisa Jadi Menyenangkan.. ASOY...
Minggu, 21 Februari 2010
Migrasi ke energy alternatif
Krisis energi global dan pemanasan global yang terjadi menyebabkan pemerintah Indonesia dan dunia mulai melakukan penghematan terhadap sumber daya energi tak terbarukan (minyak bumi, gas alam, dan batubara), dan penghematan energi listrik yang sebagian pembangkitnya memakai bahan bakar minyak dalam memproduksi energi listriknya. Selain cadangan energi konvensional dengan bahan sumber energi fosil di Indonesia yang sudah semakin menipis, tingginya harga minyak dunia menyebabkan pasokan listrik dari PLN menjadi berkurang. Dampaknya adalah kelangkaan energi BBM dan naiknya harga kebutuhan konsumsi, serta makin rendahnya akses masyarakat terhadap energi. Kelangkaan energi listrik ini mengakibatkan adanya kebijakan pemadaman bergilir, serta perubahan jadwal kerja industri yang menuai banyak kontroversi. Padahal pemadaman listrik di Jakarta akibat pemadaman kawasan Jakarta berpotensi menimbulkan kerugian sebesar Rp. 1 triliun dan 500 industri besar terganggu (Kompas, 13 Oktober 2009).
Industri pertambakan dan perikanan air payau juga mengalami kerugian. Kerugian ini dapat ditinjau dari 2 sisi dimana jika pertambakan tersebut menggunakan energi listrik untuk memompa air maka pemadaman listrik akan menjadi ancaman. Namun jika proses dalam pertambakan menggunakan diesel dalam memompa air yang menggunakan solar, maka kelangkaan bahan bakar minyak menjadi momok yang menakutkan.
Industri pertambakan dan perikanan air payau juga mengalami kerugian. Kerugian ini dapat ditinjau dari 2 sisi dimana jika pertambakan tersebut menggunakan energi listrik untuk memompa air maka pemadaman listrik akan menjadi ancaman. Namun jika proses dalam pertambakan menggunakan diesel dalam memompa air yang menggunakan solar, maka kelangkaan bahan bakar minyak menjadi momok yang menakutkan.
Sabtu, 20 Februari 2010
Embryology
THE TERM Embryology, in its widest sense, is applied to the various changes which take place during the growth of an animal from the egg to the adult condition: it is, however, usually restricted to the phenomena which occur before birth. Embryology may be studied from two aspects: (1) that of ontogeny, which deals only with the development of the individual; and (2) that of phylogeny, which concerns itself with the evolutionary history of the animal kingdom. 1
In vertebrate animals the development of a new being can only take place when a female germ cell or ovum has been fertilized by a male germ cell or spermatozoön. The ovum is a nucleated cell, and all the complicated changes by which the various tissues and organs of the body are formed from it, after it has been fertilized, are the result of two general processes, viz., segmentation and differentiation of cells. Thus, the fertilized ovum undergoes repeated segmentation into a number of cells which at first closely resemble one another, but are, sooner or later, differentiated into two groups: (1) somatic cells, the function of which is to build up the various tissues of the body; and (2) germinal cells, which become imbedded in the sexual glands—the ovaries in the female and the testes in the male—and are destined for the perpetuation of the species. 2
Having regard to the main purpose of this work, it is impossible, in the space available in this section, to describe fully, or illustrate adequately, all the phenomena which occur in the different stages of the development of the human body. Only the principal facts are given, and the student is referred for further details to one or other of the text-books 1 on human embryology
In vertebrate animals the development of a new being can only take place when a female germ cell or ovum has been fertilized by a male germ cell or spermatozoön. The ovum is a nucleated cell, and all the complicated changes by which the various tissues and organs of the body are formed from it, after it has been fertilized, are the result of two general processes, viz., segmentation and differentiation of cells. Thus, the fertilized ovum undergoes repeated segmentation into a number of cells which at first closely resemble one another, but are, sooner or later, differentiated into two groups: (1) somatic cells, the function of which is to build up the various tissues of the body; and (2) germinal cells, which become imbedded in the sexual glands—the ovaries in the female and the testes in the male—and are destined for the perpetuation of the species. 2
Having regard to the main purpose of this work, it is impossible, in the space available in this section, to describe fully, or illustrate adequately, all the phenomena which occur in the different stages of the development of the human body. Only the principal facts are given, and the student is referred for further details to one or other of the text-books 1 on human embryology
Rabu, 03 Februari 2010
3 Most Favorites Sample Book
Just for this Blog I had to share many sample book. Actualy sample books For Biophysics.
- This Book Is introduction to Molecular organism for viewing in Biophysics studies, all of us know how to studied biology. But this book is expert to explained about molecular studies for biology and physics.
- Are You Famous?? Now we can exist for social networking. However some this time we must connected internet, and one off most popular dirrect chat room in My contry is Yahoo Messenger this book actually sample. And just including in Indonesians Leanguage.
- After lesson in our class sometime we build Blog and Forum. so Just check this sample
This posting is starting from Lab BLog Team. rusli so Just check that samples
Thanks
Jumat, 29 Januari 2010
Deep Vein thrombosis (2)
to continuing our atricle before
Proportion of DVT cases with clot at each location. Note that all clots in this series involve either the popliteal vein, femoral vein, or both. From Lansing AW, Hirsh J, Buller H, Diagnosis of Venous Thrombosis. In Colman RW, Marder VJ, Clowes AW, George JN (ed) Hemostasis and Thrombosis: Basic Principles. 3rd ed. Philadelphia. Lippincott, 2001, pp. 1305.
Of the femoral triangle, just inferior to the inguinal canal. At this level, the CFV is distinct from the GSV,which separates to take a more superficial andmedial course as it moves distally. The common femoral artery (CFA) at this level has not yet bifurcated.Here the CFV has bifurcated into the superficial femoral vein (SFV) and deep femoral vein (not visualized at this level). The CFA has now bifurcated into the super- ficial femoral artery (SFA) and deep femoral artery (DFA).
In general, the PV is superficial to the PA. There is occasional anatomic variability so that the artery is more anterior to the vein. This can be distinguished by using adjunctive methods such as spectral and color Doppler and compression. Technique Probe Selection For the evaluation of DVT, a high-frequency linear array probe is best. In larger patients or in patients with lower extremity edema, lower-frequency probes allow for better penetration of the sound beams; however, the image can usually be obtained with the high-frequency linear probe (5–10 MHz).
Views
At least two views are necessary:
1. Common femoral vein demonstrating compression of vessel – this usually
involves visualizing both the common femoral and greater saphenous
veins as seen in Figure 8.4. Some authors have argued that it is prudent
to compress both the common femoral and greater saphenous veins
and then to slide distal to the femoral triangle to compress the superficial
femoral vein as well, but this is not universally accepted.
2. Popliteal vein demonstrating compression of vessel
The simplified compression technique is performed by using the highfrequency
linear probe and identifying the common femoral and popliteal
veins. In Figures , probe positioning for femoral vein and popliteal
vein visualization is demonstrated. The probe marker should be directed
toward the patient’s right side.
If the veins are collapsible to a thin line with external pressure applied (Figure
8.9), the vein is presumed to be patent and there is no clot present. If the
vein does not collapse with external pressure, there is presumed to be clot
within the lumen of the vessel preventing complete collapse.
There are a few structures that can be mistaken for a noncompressible vessel
and that are worth mentioning. Lymph nodes can look like clot within a
hypoechoic vessel because they have a ring of hypoechoic fluid surrounding
the node. However, they are easy to distinguish because if the probe is turned
longitudinally, it will become obvious that the object is circular and not tubular.
Baker’s cysts can cause the same phenomenon in the popliteal fossa but
again dynamic scanning in longitudinal and transverse planes should remove
any doubt. Pseudoaneurysms and groin hematomas can also be misleading,
and caution should be exercised in clinical situations where these diagnoses
are being considered. This is where color Doppler can often be helpful
Scanning Tips
Proportion of DVT cases with clot at each location. Note that all clots in this series involve either the popliteal vein, femoral vein, or both. From Lansing AW, Hirsh J, Buller H, Diagnosis of Venous Thrombosis. In Colman RW, Marder VJ, Clowes AW, George JN (ed) Hemostasis and Thrombosis: Basic Principles. 3rd ed. Philadelphia. Lippincott, 2001, pp. 1305.
Of the femoral triangle, just inferior to the inguinal canal. At this level, the CFV is distinct from the GSV,which separates to take a more superficial andmedial course as it moves distally. The common femoral artery (CFA) at this level has not yet bifurcated.Here the CFV has bifurcated into the superficial femoral vein (SFV) and deep femoral vein (not visualized at this level). The CFA has now bifurcated into the super- ficial femoral artery (SFA) and deep femoral artery (DFA).
In general, the PV is superficial to the PA. There is occasional anatomic variability so that the artery is more anterior to the vein. This can be distinguished by using adjunctive methods such as spectral and color Doppler and compression. Technique Probe Selection For the evaluation of DVT, a high-frequency linear array probe is best. In larger patients or in patients with lower extremity edema, lower-frequency probes allow for better penetration of the sound beams; however, the image can usually be obtained with the high-frequency linear probe (5–10 MHz).
Views
At least two views are necessary:
1. Common femoral vein demonstrating compression of vessel – this usually
involves visualizing both the common femoral and greater saphenous
veins as seen in Figure 8.4. Some authors have argued that it is prudent
to compress both the common femoral and greater saphenous veins
and then to slide distal to the femoral triangle to compress the superficial
femoral vein as well, but this is not universally accepted.
2. Popliteal vein demonstrating compression of vessel
The simplified compression technique is performed by using the highfrequency
linear probe and identifying the common femoral and popliteal
veins. In Figures , probe positioning for femoral vein and popliteal
vein visualization is demonstrated. The probe marker should be directed
toward the patient’s right side.
If the veins are collapsible to a thin line with external pressure applied (Figure
8.9), the vein is presumed to be patent and there is no clot present. If the
vein does not collapse with external pressure, there is presumed to be clot
within the lumen of the vessel preventing complete collapse.
There are a few structures that can be mistaken for a noncompressible vessel
and that are worth mentioning. Lymph nodes can look like clot within a
hypoechoic vessel because they have a ring of hypoechoic fluid surrounding
the node. However, they are easy to distinguish because if the probe is turned
longitudinally, it will become obvious that the object is circular and not tubular.
Baker’s cysts can cause the same phenomenon in the popliteal fossa but
again dynamic scanning in longitudinal and transverse planes should remove
any doubt. Pseudoaneurysms and groin hematomas can also be misleading,
and caution should be exercised in clinical situations where these diagnoses
are being considered. This is where color Doppler can often be helpful
Scanning Tips
- Proper patient positioning can greatly improve image quality.Have the patient externally rotate his or her leg to better visualize thecommon femoral vein.
- For the popliteal vein, have the patient hang his or her leg over the edge of the bed to distend the vessels, or perform the scan with the patient in a prone position.
- Be sure the veins fully compress. A normal vein will completely disappear when compressed enough; if the walls do not touch, consider DVT.
- Make sure you are applying pressure evenly. The probe should be perpendicular to the skin. If pressure is being applied at an angle, the vessel may appear not to collapse because of unevenly distributed pressure.
Deep Vein Thrombosis (scanning tutor)

Introduction
Although not one of the original six American College of Emergency Physicians indicated exams, evaluation for deep vein thrombosis (DVT) is one of the most useful exams for critical care physicians. There are approximately 250,000 new diagnoses of DVT per year and 50,000 deaths from thromboembolic disease annually (1,2). The estimated rate of propagation from DVT to pulmonary embolism ranges from 10% to 50% (1,2). Because the incidence of DVT is so high and because this disease is so prevalent in critical and acute care settings, the ability to rule in or rule out DVT at the bedside is a particularly powerful tool. The simplified compression technique described in this chapter evaluates for DVT at two anatomic sites of the lower extremity venous system. This protocol has been evaluated in multiple randomized controlled studies and has become a well-accepted protocol used for decision making in conjunction with clinical pre-test probability assessments (3–12)
Focused Questions for DVT Ultrasound
The questions for DVT ultrasound are as follows:
- Does the common femoral vein fully compress?
- Does the popliteal vein fully compress?
Anatomy
The anatomy of the lower extremity should be reviewed so the DVT compression ultrasound exam can be done properly. The ileac vein becomes the common femoral vein (CFV) as it leaves the pelvis. The most proximal tributary of the CFV is the greater saphenous vein (GSV) (Figure A). The common femoral then splits into the superficial and deep femoral in the proximal thigh – both of these vessels are part of the deep venous system despite their names. At the knee, the superficial femoral becomes the popliteal vein running in the posterior fossa of the knee joint and is joined by its tributaries, the tibial vein and peroneal vein . It is not surprising that clots, as shown by venography studies, seem to cluster at the branch points of the venous system. One common explanation is that the increased turbulent flow at these branch points produces increased wear and tear on the vessel walls, thus making these areas predisposed to clot formation. Data from these venography studies support the use of the simplified compression
technique because identification of clot in the popliteal vein or CFVshould identify any DVTs dentified by venography ; there were no cases in these initial studies where a DVT did not involve the popliteal vein, CFV, or both.
Proximal venous system. Courtesy of Dr. Manual Colon, Hospital of the University of Puerto
Rico, Carolina, Puerto Rico.
Jumat, 22 Januari 2010
ANTHROPOLOGY
A term derived from the Greek to describe a specific science of humankind; its early usage was confused because there were several different views in the nineteenth century of how the contents of that science ought to be defined. In the twentieth century the term was most commonly used as a tacit abbreviation of the phrase ‘‘cultural anthropology’’, describing the comparative study of tribal societies. That discipline had been more usually labeled *ethnology in the nineteenth century, and the present article focusesmore narrowly on what twentieth-century parlance describes as ‘‘physical anthropology’’:
The study of the various biological species belonging to the genus Homo. All but one of those species are now extinct, the remainder being known by courtesy of discoveries in *palaeontology, but those alleged to be ancestral to Homo sapiens are of intense interest in the context of the theory of *evolution and its opposition by the doctrine of *creationism.Eighteenth-century descriptions of the great apes were still rather sketchy, the ‘‘ourang-outan/primate from kalimantan (BORNEO)’’
Remaining mysterious and the gorilla virtually unknown. But a new description of the former published in Petrus Camper’s ‘‘Account of the Organs of Speech in the Orang Outang’’ (1779) greatly interested James Burnet, Lord Monboddo, who was in the process of producing an account ‘‘Of the Origin and Progress of Language’’ (1779–1799); Monboddo’s reflections on the question of whether or not the ‘‘orang utan’’ should be classified as human were satirically reflected by Thomas Love Peacock in Melincourt; or, Sir Orang Haut-Ton (1817). Orang-utans and other great apes were, however, rudely expelled from the register of human types by early anthropologists—a move obliquely echoed by Edgar Allan Poe’s account of the perpetrator of '‘The Murders in the Rue Morgue’’ (1841).
Kamis, 21 Januari 2010
Physical Modeling of Lipid Membranes
For preparing next semester Biofisika blog and team launch many modules for student of college especially for jember university of student (Jurusan Fisika/ Prodi Biofisika) . including teaching department, agriculture, pharmachy, biology and many department or faculty that need this module>>
Mathematical models of deformable, fluid membranes have been available for many years and have been successfully compared with experimental results, both on artificial and biological membranes. At the most fundamental level these theories rely on the single basic principle underlying statistical mechanics:
that the probability of observing a given membrane deformation depends on the
energy change involved in making this deformation The higher the energy,
the less likely the deformation.
Statistical mechanics tells us that the probability pi of an event i is related to its energy Fi according to:
Mathematical models of deformable, fluid membranes have been available for many years and have been successfully compared with experimental results, both on artificial and biological membranes. At the most fundamental level these theories rely on the single basic principle underlying statistical mechanics:
that the probability of observing a given membrane deformation depends on the
energy change involved in making this deformation The higher the energy,
the less likely the deformation.
Statistical mechanics tells us that the probability pi of an event i is related to its energy Fi according to:
pi ~ exp [– Fi /kBTm ]
This probability compares the deformation energy Fi to some energy source in the system. This energy is written F to remind us that it is a free energy and therefore includes changes in entropy, as well as internal and chemical energies Reactions that reduce the entropy of the system are disfavored in the same way as are those that involve a spontaneous increase in the energy by, for example, disruptingchemical bonds. Strictly speaking, that equation only holds for (sub)systems that are at equilibrium but this can often be a reasonable approximation, for example for small patches of membrane that can move and relax quickly, even though it may be inappropriate for the cell as a whole. In passive systems, the only energy source comes from the thermal fluctuations of energy kBT, where kB is the Boltzmann constant and T is the temperatureBiological systems are called “active”, because chemical energy, coming from, for example, ATP hydrolysis, can be harnessed by specific enzymes (molecular motors) to perform mechanical work. The cell membrane is generally the site of many active processes, including cytoskeleton polymerization and ion pumping. One may adopt the approach that these active processes provide an effective “membrane” temperature Tm > T and it is this that appears in Equation above.
Rabu, 20 Januari 2010
The Physics of Plasmas
The Physics of Plasmas provides a comprehensive introduction to the subject suitable for adoption as a self-contained text for courses at advanced undergraduate and graduate level. The extensive coverage of basic theory is illustrated with examples drawn from fusion, space and astrophysical plasmas. A particular strength of the book is its discussion of the various models used to describe plasma physics including particle orbit theory, fluid equations, ideal and resistive magnetohydrodynamics, wave equations and kinetic theory. The relationships between these distinct approaches are carefully explained giving the reader a firm grounding in the fundamentals, and developing this into an understanding of some of the more specialized topics. Throughout the text, there is an emphasis on the physical interpretation of plasma phenomena and exercises, designed to test the reader’s understanding at a variety of levels, are provided.
Students of physics and astronomy, engineering and applied mathematics will find a clear and rigorous explanation of the fundamental properties of plasmas with minimal mathematical formality. This book will also serve as a reference source for physicists and engineers engaged in research on aspects of fusion and space plasmas.
Students of physics and astronomy, engineering and applied mathematics will find a clear and rigorous explanation of the fundamental properties of plasmas with minimal mathematical formality. This book will also serve as a reference source for physicists and engineers engaged in research on aspects of fusion and space plasmas.
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